Chapter 11 Attention.

Strange to say, so patent a fact as the perpetual presence of selective attention has received hardly any notice from psychologists of the English empiricist school. The Germans have explicitly¹ treated of it, either as a faculty² or as a resultant, but in the pages of such writers as Locke, Hume, Hartley, the Mills, and Spencer the word hardly occurs, or if it does so, it is parenthetically and as if by inadvertence.1 The motive⁴ of this ignoring of the phenomenon of attention is obvious enough. These writers are bent⁵ on showing how the higher faculties⁶ of the mind are pure products of 'experience;' and experience is supposed to be of something simply given. Attention, implying a degree of reactive spontaneity, would seem to break through the circle of pure receptivity which constitutes 'experience,' and hence must not be spoken of under penalty of interfering⁹ with the smoothness of the tale.

But the moment one thinks of the matter, one sees how false a notion of experience that is which would make it tantamount to the mere¹⁰ presence to the senses of an outward order. Millions of items of the outward order are present to my senses which never properly enter into my experience. Why? Because they have no interest for me. My experience is what I agree to attend to. Only those items which I notice shape my mind - without selective interest, experience is an utter chaos¹¹. Interest alone gives accent and emphasis, light and shade, background and foreground - intelligible¹² perspective, in a word. It varies in every creature, but without it the consciousness of every creature would be a gray chaotic¹³ indiscriminateness, impossible for us even to conceive. Such an empiricist writer as Mr. Spencer, for example, regards the creature as absolutely passive clay, upon which 'experience' rains down. The clay will be impressed most deeply where the drops fall thickest, and so the final shape of the mind is moulded. Give time enough, and all sentient¹⁵ things ought, at this rate, to end by assuming an identical mental constitution - for 'experience,' the sole shaper, is a constant fact, and the order of its items must end by being exactly reflected by the passive mirror which we call the sentient organism. If such an account were true, a race of dogs bred for generations, say in the Vatican, with characters of visual shape, sculptured in marble, presented to their eyes, in every variety of form and combination, ought to discriminate¹⁴ before long the finest shades of these peculiar¹⁶ characters. In a word, they ought to become, if time were given, accomplished¹⁷ connoisseurs¹⁸ of sculpture. Anyone may judge of the probability of this consummation. Surely an eternity²⁰ of experience of the statues would leave the dog as inartistic as he was at first, for the lack of an original interest to knit his discriminations on to. Meanwhile the odors at the bases of the pedestals would have organized themselves in the consciousness of this breed of dogs into a system of 'correspondences' to which the most heredity caste of custodi would never approximate, merely because to them, as human beings, the dog's interest in those smells would for ever be an inscrutable mystery. These writers have, then, utterly²¹ ignored the glaring fact that subjective²² interest may, by laying its weighty index-finger on particular items of experience, so accent them as to give to the least frequent associations far more power to shape our thought than the most frequent ones possess. The interest itself, though its genesis is doubtless perfectly²³ natural, makes experience more than it is made by it.

Every one knows what attention is. It is the taking possession by the mind, in clear and vivid form, of one out of what seem several simultaneously²⁴ possible objects or trains of thought. Focalization, concentration, of consciousness are of its essence. It implies withdrawal²⁵ from some things in order to deal effectively with others, and is a condition which has a real opposite in the confused, dazed, scatterbrained state which in French is called distraction²⁶, and Zerstreutheit in German.

We all know this latter state, even in its extreme degree. Most people probably fall several times a day into a fit of something like this: The eyes are fixed²⁷ on vacancy²⁸, the sounds of the world melt into confused unity²⁹, the attention is dispersed³⁰ so that the whole body is felt, as it were, at once, and the foreground of consciousness is filled, if by anything, by a sort of solemn sense of surrender to the empty passing of time. In the dim background of our mind we know meanwhile what we ought to be doing: getting up, dressing³² ourselves, answering the person who has spoken to us, trying to make the next step in our reasoning. But somehow we cannot start; the pensée de derrière la tête fails to pierce the shell of lethargy that wraps our state about. Every moment we expect the spell to break, for we know no reason why it should continue. But it does continue, pulse after pulse, and we float with it, until - also without reason that we can discover - an energy is given, something - we know not what - enables us to gather ourselves together, we wink³³ our eyes, we shake our heads, the background-ideas become effective, and the wheels of life go round again.

This curious state or inhibition can for a few moments be produced at will by fixing the eyes on vacancy. Some persons can voluntarily empty their minds and 'think of nothing.' With many, as Professor Exner remarks of himself, this is the most efficacious means of falling asleep. It is difficult not to suppose something like this scattered³⁵ condition of mind to be the usual state of brutes³⁶ when not actively³⁷ engaged in some pursuit. Fatigue³⁸, monotonous³⁹ mechanical occupations that end by being automatically carried on, tend to reproduce it in men. It is not sleep; and yet when aroused from such a state, a person will often hardly be able to say what he has been thinking about. Subjects of the hypnotic trance seem to lapse⁴⁰ into it when left to themselves; asked what they are thinking of, they reply, 'of nothing particular'!2

The abolition⁴¹ of this condition is what we call the awakening⁴³ of the attention. One principal object comes then into the focus of consciousness, others are temporarily suppressed. The awakening may come about either by reason of a stimulus⁴⁴ from without, or in consequence of some unknown inner alteration⁴⁵; and the change it brings with it amounts to a concentration upon one single object with exclusion⁴⁶ of aught besides, or to a condition anywhere between this and the completely dispersed state.
To How Many Things Can We Attend at Once?

The question of the 'span' of consciousness has often been asked and answered - sometimes a priori, sometimes by experiment. This seems the proper place for us to touch upon it; and our answer, according to the principles laid down in Chapter IX, will not be difficult. The number of things we may attend to is altogether indefinite, depending on the power of the individual intellect, on the form of the apprehension⁴⁸, and on what the things are. When apprehended⁴⁹ conceptually as a connected system, their number may be very large. But however numerous the things, they can only be known in a single pulse of consciousness for which they form one complex 'object' (p. 276 ff.), so that properly speaking there is before the mind at no time a plurality of ideas, properly so called.

The 'unity of the soul' has been supposed by many philosophers, who also believed in the distinct atomic nature of 'ideas,' to preclude⁵¹ the presence to it of more than one objective fact, manifested in one idea, at a time. Even Dugald Stuart opines that every minimum visible of a pictured figure

"constitutes just as distinct an object of attention to the mind as if it were separated by an interval⁵² of empty space from the rest. . . . It is impossible for the mind to attend to more than one of these points at once; and as the perception of the figure implies a knowledge of the relative situation of the different points with respect to each other, we must conclude that the perception of figure by the eye is the result of a number of different acts of attention. These acts of attention, however, are performed with such rapidity, that the effect, with respect to us, is the same as if the perception were instantaneous."3

Such glaringly artificial views can only come from fantastic metaphysics or from the ambiguity⁵³ of the word 'idea,' which, standing⁵⁴ sometimes for mental state and sometimes for things known, leads men to ascribe to the thing, not only the unity which belongs to the mental state, but even the simplicity⁵⁵ which is thought to reside in the Soul.

When the things are apprehended by the senses, the number of them that can be attended to at once is small, "Pluribus intentus, minor⁵⁶ est ad singula sensus."

"By Charles Bonnet⁵⁷ the Mind is allowed to have a distinct notion of six objects at once; by Abraham Tucker the number is limited to four; while Destutt Tracy again amplifies⁵⁸ it to six. The opinion of the first and last of these philosophers" [continues Sir Wm. Hamilton] "seems to me correct. You can easily make the experiments for yourselves, but you must beware of grouping the objects into classes. If you throw a handful of marbles on the floor, you will find it difficult to view at once more than six, or seven at most, without confusion; but if you group them into twos, or threes, or fives, you can comprehend as many groups as you can units; because the mind considers these groups only as units - it views them as wholes, and throws their parts out of consideration."4

Professor Jevons, repeating this observation, by counting instantaneously beans thrown into a box, found that the number 6 was guessed correctly 120 times out of 147, 5 correctly 102 times out of 107, and 4 and 3 always right.5 It is obvious that such observations decide nothing at all about our attention, properly so called. They rather measure in part the distinctness of our vision - especially of the primary-memory-image6 - in part the amount of association in the individual between seen arrangements and the names of numbers.7

Each number-name is a way of grasping the beans as one total object. In such a total object, all the parts converge⁵⁹ harmoniously⁶⁰ to the one resultant concept; no single bean has special discrepant⁶¹ associations of its own; and so, with practice, they may grow quite numerous ere we fail to estimate them aright. But where the 'object' before us breaks into parts disconnected with each other, and forming each as it were a separate object or system, not conceivable in union with the rest, it becomes harder to apprehend⁵⁰ all these parts at once, and the mind tends to let go of one whilst it attends to another. Still, within limits this can be done. M. Paulhan has experimented carefully on the matter by declaiming one poem aloud whilst he repeated a different one mentally, or by writing one sentence whilst speaking another, or by performing calculations on paper whilst reciting poetry.8 He found that

"the most favorable condition for the doubling of the mind was its sinultaneous [sic] application to two easy and heterogeneous⁶³ operations. Two operations of the same sort, two multiplications⁶⁴, two recitations, or the reciting one poem and writing another, render the process more uncertain and difficult."

The attention often, but not always, oscillates during these performances; and sometimes a word from one part of the task slips into another. I myself find when I try to simultaneously recite one thing and write another that the beginning of each word or segment of a phrase is what requires the attention. Once started, my pen runs on for a word or two as if by its own momentum⁶⁵. M. Paulhan compared the time occupied by the same two operations done simultaneously or in succession, and found that there was often a considerable gain of time from doing them simultaneously. For instance:

" I write the first four verses of Athalie, whilst reciting eleven of Musset. The whole performance occupies 40 seconds. But reciting alone takes 22 and writing alone takes 31, or 53 altogether, so that there is a difference in favor of the simultaneous operations."

Or again:

"I multiply 421 312 212 by 2; the operation takes 6 seconds; the recitation of 4 verses also takes 6 seconds. But the two operations done at once only take 6 seconds, so that there is no loss of time from combining them."

Of course these time-measurements lack precision. With three systems of objects (writing with each hand whilst reciting) the operation became much more difficult.

If, then, by the original question, how many ideas or things can we attend to at once, be meant how many entirely⁶⁶ disconnected systems or processes of conception can go on simultaneously, the answer is, not easily more than one, unless the processes are very habitual⁶⁷; but then two, or even three, without very much oscillation of the attention. Where, however, the processes are less automatic, as in the story of Julius Caesar dictating⁶⁸ four letters whilst he writes a fifth,9 there must be a rapid oscillation of the mind from one to the next, and no consequent gain of time. Within any one of the systems the parts may be numberless, but we attend to them collectively when we conceive the whole which they form.

When the things to be attended to are small sensations, and when the effort is to be exact in noting them, it is found that attention to one interferes⁷⁰ a good deal with the perception of the other. A good deal of fine work has been done in this field, of which I must give some account.

It has long been noticed, when expectant attention is concentrated upon one of two sensations, that the other one is apt to be displaced from consciousness for a moment and to appear subsequent; although in reality the two may have been contemporaneous events. Thus, to use the stock example of the books, the surgeon would sometimes see the blood flow from the arm of the patient whom he was bleeding, before he saw the instrument penetrate⁷¹ the skin. Similarly the smith may see the sparks fly before he sees the hammer smite⁷² the iron, etc. There is thus a certain difficulty in perceiving the exact date of two impressions when they do not interest our attention equally, and when they are of a disparate sort.

Professor Exner, whose experiments on the minimal⁷³ perceptible succession in time of two sensations we shall have to quote in another chapter, makes some noteworthy remarks about the way in which the attention must be set to catch the interval and the right order of the sensations, when the time is exceeding small. The point was to tell whether two signals were simultaneous or successive; and, if successive, which one of them came first.

The first way of attending which he found himself to fall into, was when the signals did not differ greatly - when, e.g., they were similar sounds heard each by a different ear. Here he lay in wait for the first signal, whichever it might be, and identified it the next moment in memory. The second, which could then always be known by default, was often not clearly distinguished⁷⁵ in itself. When the time was too short, the first could not be isolated⁷⁶ from the second at all.

The second way was to accommodate the attention for a certain sort of signal, and the next moment to become aware in memory of whether it came before or after its mate.

"This way brings great uncertainty⁷⁷ with it. The impression not prepared for comes to us in the memory more weak than the other, obscure as it were, badly fixed in time. We tend to take the subjectively⁷⁸ stronger stimulus, that which we were intent upon, for the first, just as we are apt to take an objectively stronger stimulus to be the first. Still, it may happen otherwise. In the experiments from touch to sight it often seemed to me as if the impression for which the attention was not prepared were there already when the other came."

Exner found himself employing this method oftenest when the impressions differed strongly.10

In such observations (which must not be confounded with those where the two signals were identical and their successiveness known as mere doubleness, without distinction of which came first), it is obvious that each signal must combine stably in our perception with a different instant of time. It is the simplest possible case of two discrepant concepts simultaneously occupying the mind. Now the case of the signals being simultaneous seems of a different sort. We must turn to Wundt for observations fit to cast a nearer light thereon.

The reader will remember the reaction-time experiments of which we treated in Chapter III. It happened occasionally in Wundt's experiments that the reaction-time was reduced to zero or even assumed a negative value, which, being translated into common speech, means that the observer was sometimes so intent upon the signal that his reaction actually coincided in time with it, or even preceded it, instead of coming a fraction of a second after it, as in the nature of things it should. More will be said of these results anon. Meanwhile Wundt, in explaining them, says this:

"In general we have a very exact feeling of the simultaneity of two stimuli⁷⁹, if they do not differ much in strength. And in a series of experiments in which a warning precedes, at a fixed interval, the stimulus, we involuntarily try to react, not only as promptly⁸⁰ as possible, but also in such wise that our movement may coincide with the stimulus itself. We seek to make our own feelings of touch and innervation [muscular contraction⁸¹] objectively contemporaneous with the signal which we hear; and experience shows that in many cases we approximately succeed. In these cases we have a distinct consciousness of hearing the signal, reacting upon it, and feeling our reaction take place, - all at one and the same moment."11

In another place, Wundt adds:

"The difficulty of these observations and the comparative infrequency with which the reaction-time can be made thus to disappear shows how hard it is, when our attention is intense, to keep it fixed even on two different ideas at once. Note besides that when this happens, one always tries to bring the ideas into a certain connection, to grasp them as components⁸² of a certain complex representation. Thus in the experiments in question, it has often seemed to me that I produced by my own recording⁸³ movement the sound which the ball made in dropping on the board."12

The 'difficulty,' in the cases of which Wundt speaks, is that of forcing two non-simultaneous events into apparent combination with the same instant of time. There is no difficulty, as he admits, in so dividing our attention between two really simultaneous impressions as to feel them to be such. The cases he describes are really cases of anachronistic⁸⁴ perception, of subjective time-displacement⁸⁵, to use his own term. Still more curious cases of it have been most carefully studied by him. They carry us a step farther in our research, so I will quote them, using as far as possible his exact words:

"The conditions become more complicated when we receive a series of impressions separated by distinct intervals⁸⁶, into the midst of which a heterogeneous impression is suddenly brought. Then comes the question, with which member of the series do we perceive the additional impression to coincide? with that member with whose presence it really coexists, or is there some aberration⁸⁷? . . . If the additional stimulus belongs to a different sense very considerable aberrations⁸⁸ may occur.

"The best way to experiment is with a number of visual impressions (which one can easily get from a moving object) for the series, and with a sound as the disparate impression. Let, e.g., an index-hand move over a circular scale with uniform and sufficiently⁸⁹ slow velocity⁹⁰, so that the impressions it gives will not fuse, but permit its position at any instant to be distinctly seen. Let the clockwork which turns it have an arrangement which rings a bell once in every revolution, but at a point which can be varied⁹¹, so that the observer need never know in advance just when the bell-stroke takes place. In such observations three cases are possible. The bell-stroke can be perceived either exactly at the moment to which the index points when it sounds - in this case there will be no time-displacement; or we can combine it with a later position of the index - . . . positive time-displacement, as we shall call it; or finally we can combine it with a position of the index earlier than that at which the sounds occurred - and this we will call a negative displacement. The most natural displacement would apparently⁹² be the positive, since for apperception a certain time is always required. . . . But experience shows that the opposite is the case: it happens most frequently that the sound appears earlier than its real date - far less often coincident with it, or later. It should be observed that in all these experiments it takes some time to get a distinctly perceived combination of the sound with a particular position of the index, and that a single revolution of the latter is never enough for the purpose. The motion must go on long enough for the sounds themselves to form a regular series - the outcome being a simultaneous perception of two distinct series of events, of which either may by changes in its rapidity modify the result. The first thing one remarks is that the sound belongs in a certain region of the scale; only gradually is it perceived to combine with a particular position of the index. But even a result gained by observation of many revolutions may be deficient⁹³ in certainty, for accidental combinations of attention have a great influence upon it. If we deliberately⁹⁴ try to combine the bell-stroke with an arbitrarily chosen position of the index, we succeed without difficulty, provided this position be not too remote from the true one. If, again, we cover the whole scale, except a single division over which we may see the index pass, we have a strong tendency to combine the bell-stroke with this actually seen position; and in so doing may easily overlook more than 1/4 of a second of time. Results, therefore, to be of any value, must be drawn⁹⁵ from long-continued and very numerous observations, in which such irregular oscillations of the attention neutralize⁹⁶ each other according to the law of great numbers, and allow the true laws to appear. Although my own experiments extend over many years (with interruption), they are not even yet numerous enough to exhaust the subject - still, they bring out the principal laws which the attention follows under such conditions."13

Wundt accordingly distinguishes the direction from the amount of the apparent displacement in time of the bell-stroke. The direction depends on the rapidity of the movement of the index and (consequently) on that of the succession of the bell-strokes. The moment at which the bell struck was estimated by him with the least tendency to error, when the revolutions took place once in a second. Faster than this, positive errors began to prevail; slower, negative ones almost always were present. On the other hand, if the rapidity went quickening, errors became negative; if slowing, positive. The amount of error is, in general, the greater the slower the speed and its alterations⁹⁷. Finally, individual differences prevail, as well as differences in the same individual at different times.14

Wundt's pupil von Tschisch has carried out these experiments on a still more elaborate scale,15 using, not only the single bell-stroke, but 2, 3, 4, or 5 simultaneous impressions, so that the attention had to note the place of the index at the moment when a whole group of things was happening. The single bell-stroke was always heard too early by von Tschisch - the displacement was invariably 'negative.' As the other simultaneous impressions were added, the displacement first became zero and finally positive, i.e. the impressions were connected with a position of the index that was too late. This retardation⁹⁸ was greater when the simultaneous impressions were disparate (electric tactile⁹⁹ stimuli on different places, simple touch-stimuli, different sounds) than when they were all of the same sort. The increment¹⁰⁰ of retardation became relatively¹⁰¹ less with each additional impression, so that it is probable that six impressions would have given almost the same result as five, which was the maximum number used by Herr von T.

Wundt explains all these results by his previous observation that a reaction sometimes antedates¹⁰³ the signal (see above, p. 411). The mind, he supposes, is so intent upon the bell-strokes that its 'apperception' keeps ripening¹⁰⁴ periodically after each stroke in anticipation¹⁰⁵ of the next. Its most natural rate of ripening may be faster or slower than the rate at which the strokes come. If faster, then it hears the stroke too early; if slower, it hears it too late. The position of the index on the scale, meanwhile, is noted¹⁰⁶ at the moment, early or late, at which the bell-stroke is subjectively heard. Substituting several impressions for the single bell-stroke makes the ripening of the perception slower, and the index is seen too late. So, at least, do I understand the explanations which Herren Wundt and v. Tschisch give.16

This is all I have to say about the difficulty of having two discrepant concepts together, and about the number of things to which we can simultaneously attend.
The Varieties of Attention.

The things to which we attend are said to interest us. Our interest in them is supposed to be the cause of our attending. What makes an object interesting we shall see presently; and later inquire in what sense interest may cause attention. Meanwhile

Attention may be divided into kinds in various ways.

It is either to

a) Objects of sense (sensorial attention); or to
b) Ideal or represented objects (intellectual attention).

It is either

c) Immediate¹⁰⁷; or
d) Derived¹⁰⁹: immediate, when the topic or stimulus is interesting in itself, without relation to anything else; derived, when it owes its interest to association with some other immediately interesting thing. What I call derived attention has been named 'apperceptive' attention. Furthermore, Attention may be either

e) Passive, reflex, non-voluntary, effortless; or
f) Active and voluntary.

Voluntary attention is always derived; we never make an effort to attend to an object except for the sake of some remote interest which the effort will serve. But both sensorial and intellectual attention may be either passive or voluntary.

In passive immediate sensorial attention the stimulus is a sense-impression, either very intense, voluminous, or sudden, - in which case it makes no difference what its nature may be, whether sight, sound, smell, blow, or inner pain, - or else it is an instinctive¹¹¹ stimulus, a perception which, by reason of its nature rather than its mere force, appeals to some one of our normal congenital impulses and has a directly exciting quality. In the chapter on Instinct we shall see how these stimuli differ from one animal to another, and what most of them are in man: strange things, moving things, wild animals, bright things, pretty things, metallic¹¹² things, words, blows, blood, etc., etc., etc.

Sensitiveness to immediately exciting sensorial stimuli characterizes the attention of childhood and youth. In mature age we have generally selected those stimuli which are connected with one or more so-called permanent interests, and our attention has grown irresponsive to the rest.17 But childhood is characterized by great active energy, and has few organized interests by which to meet new impressions and decide whether they are worthy⁷⁴ of notice or not, and the consequence is that extreme mobility¹¹³ of the attention with which we are all familiar in children, and which makes their first lessons such rough affairs. Any strong sensation whatever produces accommodation of the organs which perceive it, and absolute oblivion, for the time being, of the task in hand. This reflex and passive character of the attention which, as a French writer says, makes the child seem to belong less to himself than to every object which happens to catch his notice, is the first thing which the teacher must overcome. It never is overcome in some people, whose work, to the end of life, gets done in the interstices of their mind-wandering.

The passive sensorial attention is derived when the impression, without being either strong or of an instinctively¹¹⁴ exciting nature, is connected by previous experience and education with things that are so. These things may be called the motives¹¹⁵ of the attention. The impression draws an interest from them, or perhaps it even fuses into a single complex object with them; the result is that it is brought into the focus of the mind. A faint tap per se is not an interesting sound; it may well escape being discriminated¹¹⁶ from the general rumor¹¹⁷ of the world. But when it is a signal, as that of a lover on the window-pane, it will hardly go unperceived. Herbart writes:

"How a bit of bad grammar wounds the ear of the purist! How a false note hurts the musician! or an offence against good manners the man of the world! How rapid is progress in a science when its first principles have been so well impressed upon us that we reproduce them mentally with perfect distinctness and ease! How slow and uncertain, on the other hand, is our learning of the principles themselves, when familiarity with the still more elementary percepts connected with the subject has not given us an adequate predisposition! - Apperceptive attention may be plainly observed in very small children when, hearing the speech of their elders, as yet unintelligible¹¹⁸ to them, they suddenly catch a single known word here and there, and repeat it to themselves; yes! even in the dog who looks round at us when we speak of him and pronounce his name. Not far removed is the talent which mind-wandering school-boys display during the hours of instruction, of noticing every moment in which the teacher tells a story. I remember classes in which, instruction being uninteresting, and discipline relaxed, a buzzing murmur¹¹⁹ was always to be heard, which invariably stopped for as long a time as an anecdote¹²⁰ lasted. How could the boys, since they seemed to hear nothing, notice when the anecdote began? Doubtless most of them always heard something of the teacher's talk; but most of it had no connection with their previous knowledge and occupations, and therefore the separate words no sooner entered their consciousness than they fell out of it again; but, on the other hand, no sooner did the words awaken⁴² old thoughts, forming strongly-connected series with which the new impression easily combined, than out of new and old together a total interest resulted which drove the vagrant¹²¹ ideas below the threshold of consciousness, and brought for a while settled attention into their place."18

Passive intellectual attention is immediate when we follow in thought a train of images exciting or interesting per se; derived, when the images are interesting only as means to a remote end, or merely because they are associated with something which makes them dear. Owing to the way in which immerse numbers of real things become integrated into single objects of thought for us, there is no clear line to be drawn between immediate and derived attention of an intellectual sort. When absorbed in intellectual attention we may become so inattentive to outer things as to be 'absent-minded,,' 'abstracted,' or 'distraits.' All revery or concentrated meditation¹²³ is apt to throw us into this state.

"Archimedes, it is well known, was so absorbed in geometrical meditation that he was first aware of the storming of Syracuse by his own death-wound, and his exclamation¹²⁴ on the entrance of the Roman soldiers was: Noli turbare circulos meos! In like manner Joseph Scaliger, the most learned of men, when a Protestant student in Paris, was so engrossed¹²⁵ in the study of Homer that he became aware of the massacre¹²⁶ of St. Bartholomew, and of his own escape, only on the day subsequent to the catastrophe¹²⁷. The philosopher Carneades was habitually¹²⁸ liable to fits of meditation so profound that, to prevent him sinking from inanition, his maid found it necessary to feed him like a child. And it is reported of Newton that, while engaged in his mathematical researches, he sometimes forgot to dine. Cardan, one of the most illustrious of philosophers and mathematicians¹²⁹, was once, upon a journey, so lost in thought that he forgot both his way and the object of his journey. To the questions of his driver whether he should proceed, he make no answer; and when he came to himself at nightfall, he was surprised to find the carriage at a standstill, and directly under a gallows¹³¹. The mathematician¹³⁰ Vieta was sometimes so buried in meditation that for hours he bore more resemblance to a dead person than to a living, and was then wholly unconscious of everything going on around him. On the day of his marriage the great Budæus forgot everything in his philological¹³² speculations¹³⁴, and he was only awakened¹³⁵ to the affairs of the external world by a tardy¹³⁶ embassy from the marriage-party, who found him absorbed in the composition of his Commentarii."19

The absorption may be so deep as not only to banish¹³⁷ ordinary sensations, but even the severest pain. Pascal, Wesley, Robert Hall, are said to have had this capacity. Dr. Carpenter says of himself that

"he has frequently begun a lecture whilst suffering neuralgic pain so severe as to make him apprehend that he would find it impossible to proceed; yet no sooner has he by a determined¹³⁸ effort fairly launched himself into the stream of thought, than he has found himself continuously borne along without the least distraction, until the end has come, and the attention has been released; when the pain has recurred¹³⁹ with a force that has overmastered all resistance, making him wonder how he could have ever ceased to feel it."20

Dr. Carpenter speaks of launching himself by a determined effort. This effort characterizes what we called active or voluntary attention. It is a feeling which every one knows, but which most people would call quite indescribable. We get it in the sensorial sphere whenever we seek to catch an impression of extreme faintness, be it of sight, hearing, taste, smell, or touch; we get it whenever we seek to discriminate a sensation merged¹⁴¹ in a mass of others that are similar; we get it whenever we resist the attractions of more potent¹⁴² stimuli and keep our mind occupied with some object that is naturally unimpressive. We get it in the intellectual sphere under exactly similar conditions: as we strive to sharpen and make distinct an idea which we but vaguely¹⁴³ seem to have; or painfully discriminate a shade of meaning from its similars; or resolutely¹⁴⁵ hold fast to a thought so discordant¹⁴⁶ with our impulses that, if left unaided, it would quickly yield place to images of an exciting and impassioned kind. All forms of attentive¹²² effort would be exercised at once by one whom we might suppose at a dinner-party resolutely to listen to a neighbor giving him insipid¹⁴⁷ and unwelcome advice in a low voice, whilst all around the guests were loudly laughing and talking about exciting and interesting things.

There is no such thing as voluntary attention sustained for more than a few seconds at a time. What is called sustained voluntary attention is a repetition of successive efforts which bring back the topic to the mind.21 The topic once brought back, if a congenial one, develops; and if its development is interesting it engages the attention passively for a time. Dr. Carpenter, a moment back, described the stream of thought, once entered, as 'bearing him along.' This passive interest may be short or long. As soon as it flags, the attention is diverted by some irrelevant¹⁴⁹ thing, and then a voluntary effort may bring it back to the topic again; and so on, under favorable conditions, for hours together. During all this time, however, note that it is not an identical object in the psychological sense (p. 275), but a succession of mutually related objects forming an identical topic only, upon which the attention is fixed. No one can possibly attend continuously to an object that does not change.

Now there are always some objects that for the time being will not develop. They simply go out; and to keep the mind upon anything related to them requires such incessantly¹⁵¹ renewed effort that the most resolute¹⁴⁴ Will ere long gives out and let its thoughts follow the more stimulating¹⁵² solicitations after it has withstood them for what length of time it can. There are topics known to every man from which he shies like a frightened horse, and which to get a glimpse of is to shun¹⁵³. Such are his ebbing¹⁵⁴ assets to the spendthrift in full career. But why single out the spendthrift when to every man actuated by passion the thought of interests which negate¹⁵⁵ the passion can hardly for more than a fleeting¹⁵⁶ instant stay before the mind? It is like 'memento¹⁵⁷ mori' in the heyday¹⁵⁸ of the pride of life. Nature rises at such suggestions, and excludes them from the view: - How long, O healthy reader, can you now continue thinking of your tomb? - In milder instances the difficulty is as great, especially when the brain is fagged. One snatches at any and every passing pretext¹⁵⁹, no matter how trivial or external, to escape from the odiousness¹⁶⁰ of the matter in hand. I know a person, for example, who will poke⁸ the fire, set chairs straight, pick dust-specks from the floor, arrange his table, snatch up the newspaper, take down any book which catches his eye, trim his nails, waste the morning anyhow, in short, and all without premeditation, - simply because the only thing he ought to attend to is the preparation of a noonday lesson in formal logic¹³³ which he detests¹⁶¹. Anything but that!

Once more, the object must change. When it is one of sight, it will actually become invisible; when of hearing, inaudible, - if we attend to it too unmovingly. Helmholtz, who has put his sensorial attention to the severest tests, by using his eyes on objects which in common life are expressly overlooked, makes some interesting remarks on this point in his chapter on retinal rivalry¹⁶².22 The phenomenon called by that name is this, that if we look with each eye upon a different picture (as in the annexed¹⁶³ stereoscopic slide), sometimes one picture, sometimes the other, or parts of both, will come to consciousness, hardly ever both combined.

Helmholtz now says:

"I find that I am able to attend voluntarily, now to one and now to the other system of lines; and that then this system remains¹⁶⁴ visible alone for a certain time, whilst the other completely vanishes. This happens, for example, whenever I try to count the lines first of one and then of the other system. . . . But it is extremely hard to chain the attention down to one of the systems for long, unless we associate with our looking some distinct purpose which keeps the activity of the attention perpetually renewed. Such a one is counting the lines, comparing their intervals, or the like. An equilibrium¹⁶⁵ of the attention, persistent¹⁶⁶ for any length of time, is under no circumstances attainable¹⁶⁷. The natural tendency of attention when left to itself is to wander to ever new things; and so soon as the interest of its object is over, so soon as nothing new is to be noticed there, it passes, in spite of our will, to something else. If we wish to keep it upon one and the same object, we must seek constantly to find out something new about the latter, especially if other powerful impressions are attracting us away."

And again criticising an author who had treated of attention as an activity absolutely subject to the conscious will, Helmholtz writes:

"This is only restrictedly true. We move our eyes by our will; but one without training cannot so easily execute the intention of making them converge. At any moment, however, he can execute that of looking at a near object, in which act convergence is involved. Now just as little can we carry out our purpose to keep our attention steadily¹⁶⁹ fixed upon a certain object, when our interest in the object is exhausted¹⁷⁰, and the purpose is inwardly formulated¹⁷¹ in this abstract way. But we can set ourselves new questions about the object, so that a new interest in it arises, and then the attention will remain riveted¹⁷³. The relation of attention to will is, then, less one of immediate than of mediate¹⁰⁸ control."

These words of Helmholtz are of fundamental importance. And if true of sensorial attention, how much more true are they of the intellectual variety! The conditio sine quâ non of sustained attention to a given topic of thought is that we should roll it over and over incessantly and consider different aspects and relations of it in turn. Only in pathological states will a fixed and ever monotonously¹⁷⁴ recurring¹⁷⁵ idea possess the mind.

And now we can see why it is that what is called sustained attention is the easier, the richer in acquisitions and the fresher and more original the mind. In such minds, subjects bud and sprout¹⁷⁶ and grow At every moment, they please by a new consequence and rivet¹⁷² the attention afresh. But an intellect unfurnished with materials, stagnant¹⁷⁷, unoriginal, will hardly be likely to consider any subject long. A glance exhausts its possibilities of interest. Geniuses are commonly believed to excel other men in their power of sustained attention.23 In most of them, it is to be feared, the so-called 'power' is of the passive sort. Their ideas coruscate¹⁷⁸, every subject branches infinitely¹⁷⁹ before their fertile minds, and so for hours they may be rapt. But it is their genius making them attentive, not their attention making geniuses of them. And, when we come down to the root of the matter, we see that they differ from ordinary men less in the character of their attention than in the nature of the objects upon which it is successively bestowed¹⁸⁰. In the genius, these form a concatenated¹⁸² series, suggesting each other mutually by some rational law. Therefore we call the attention 'sustained' and the topic of meditation for hours 'the same.' In the common man the series is for the most part incoherent, the objects have no rational bond, and we call the attention wandering and unfixed.

It is probable that genius tends actually to prevent a man from acquiring habits of voluntary attention, and that moderate intellectual endowments are the soil in which we may best expect, here as elsewhere, the virtues¹⁸³ of the will, strictly¹⁸⁴ so called, to thrive. But, whether the attention come by grace of genius or by dint¹⁸⁵ of will, the longer one does attend to a topic the more mastery of it one has. And the faculty of voluntarily bringing back a wandering attention, over and over again, is the very root of judgment¹⁸⁶, character, and will. No one is compos sui if he have it not. An education which should improve this faculty would be the education par³ excellence¹⁸⁷. But it is easier to define this ideal than to give practical directions for bringing it about. The only general pedagogic maxim¹⁰² bearing on attention is that the more interest the child has in advance in the subject, the better he will attend. Induct him therefore in such a way as to knit each new thing on to some acquisition already there; and if possible awaken curiosity, so that the new thing shall seem to come as an answer, or part of an answer, to a question pre-existing in his mind.

At present having described the varieties, let us turn to
The Effects of Attention.

Its remote effects are too incalculable to be recorded. The practical and theoretical life of whole species, as well as of individual beings, results from the selection which the habitual direction of their attention involves. In Chapters XIV and XV some of these consequences will come to light. Suffice it meanwhile that each of us literally¹⁸⁸ chooses, by his ways of attending to things, what sort of a universe he shall appear to himself to inhabit.

The immediate effects of attention are to make us:
a) perceive-
b) conceive-
c) distinguish-
d) remember-

better than otherwise we could - both more successive things and each thing more clearly. It also
e) shortens 'reaction-time.'

a and b. Most people would say that a sensation attended to becomes stronger than it otherwise would be. This point is, however, not quite plain, and has occasioned some discussion24 >From the strength or intensity¹⁸⁹ of a sensation must be distinguished its clearness; and to increase this is, for some psychologists, the utmost that attention can do. When the facts are surveyed, however, it must be admitted that to some extent the relative intensity of two sensations may be changed when one of them is attended to and the other not. Every artist knows how he can make a scene before his eyes appear warmer or colder in color, according to the way he sets his attention. If for warm, he soon begins to see the red color start out of everything; if for cold, the blue. Similarly in listening for certain notes in a chord, or overtones in a musical sound, the one we attend to sounds probably a little more loud as well as more emphatic¹⁹⁰ than it did before. When we mentally break a series of monotonous strokes into a rhythm, by accentuating¹⁹¹ every second or third one, etc., the stroke on which the stress of attention is laid seems to become stronger as well as more emphatic. The increased visibility of optical after-images and of double images, which close attention brings about, can hardly be interpreted otherwise than as a real strengthening of the retinal sensations themselves. And this view is rendered particularly probable by the fact that an imagined visual object may, if attention be concentrated upon it long enough, acquire before the mind's eye almost the brilliancy of reality, and (in the case of certain exceptionally gifted observers) leave a negative after-image of itself when it passes away (see Chapter XVIII). Confident expectation of a certain intensity or quality of impression will often make us sensibly see or hear it in an object which really falls far short of it. In face of such facts it is rash to say that attention cannot make a sense-impression more intense.

But, on the other hand, the intensification¹⁹² which may be brought about seems never to lead the judgment astray. As we rightly perceive and name the same color under various lights, the same sound at various distances; so we seem to make an analogous¹⁹³ sort of allowance for the varying amounts of attention with which objects are viewed; and whatever changes of feeling the attention may bring we charge, as it were, to the attention's account, and still perceive and conceive the object as the same.

"A gray paper appears to us no lighter¹⁹⁴, the pendulum¹⁹⁵-beat of a clock no louder, no matter how much we increase the strain of our attention upon them. No one, by doing this, can make the gray paper look white, or the stroke of the pendulum sound like the blow of a strong hammer, - everyone, on the contrary, feels the increase as that of his own conscious activity turned upon the thing."25

Were it otherwise, we should not be able to note intensities¹⁹⁶ by attending to them. Weak impressions would, as Stumpf says,26 become stronger by the very fact of being observed.

"I should not be able to observe faint sounds at all, but only such as appeared to me of maximal strength, or at least of a strength that increased with the amount of my observation. In reality, however, I can, with steadily increasing attention, follow a diminuendo perfectly well."

The subject is one which would well repay exact experiment, if methods could be devised. Meanwhile there is no question whatever that attention augments¹⁹⁷ the clearness of all that we perceive or conceive by its aid. But what is meant by clearness here?

c. Clearness, so far as attention produces it, means distinction from other things and internal analysis or subdivision. These are essentially¹⁹⁸ products of intellectual discrimination, involving comparison, memory, and perception of various relations. The attention per se does not distinguish and analyze¹⁹⁹ and relate. The most we can say is that it is a condition of our doing so. And as these processes are to be described later, the clearness they produce had better not be farther discussed here. The important point to notice here is that it is not attention's immediate fruit.27

d. Whatever future conclusion we may reach as to this, we cannot deny that an object once attended to will remain in the memory, whilst one inattentively allowed to pass will leave no traces behind. Already in Chapter VI (see pp. 163 ff.) we discussed whether certain states of mind were 'unconscious,' or whether they were not rather states to which no attention had been paid, and of whose passage recollection could afterwards find no vestiges²⁰². Dugald Stewart says:28 "The connection between attention and memory has been remarked by many authors." He quotes Quintilian, Locke, and Helvetius; and goes on at great length to explain the phenomena²⁰³ of 'secondary automatism' (see above, p. 114 ff.) by the presence of a mental action grown so inattentive as to preserve no memory of itself. In our chapter on Memory, later on, the point will come up again.

e) Under this head, the shortening of reaction-time, there is a good deal to be said of Attention's effects. Since Wundt has probably worked over the subject more thoroughly²⁰⁴ than any other investigator²⁰⁵ and made it peculiarly his own, what follows had better, as far as possible, be in his words. The reader will remember the method and results of experimentation²⁰⁶ on 'reaction-time,' as given in Chapter III.

The facts I proceed to quote may also be taken as a supplement to that chapter. Wundt writes:

"When we wait with strained attention for a stimulus, it will often happen that instead of registering the stimulus, we react upon some entirely different impression, - and this not through confounding the one with the other. On the contrary, we are perfectly well aware at the moment of making the movement that we respond to the wrong stimulus. Sometimes even, though not so often, the latter may be another kind of sensation altogether, - one may, for example, in experimenting with sound, register a flash of light, produced either by accident or design. We cannot well explain these results otherwise than by assuming that the strain of the attention towards the impression we expect coexists with a preparatory innervation of the motor centre for the reaction, which innervation the slightest shock then suffices to turn into an actual discharge. This shock may be given by any chance impression, even by one to which we never intended to respond. When the preparatory innervation has once reached this pitch of intensity, the time that intervenes between the stimulus and the contraction of the muscles which react, may become vanishingly small."29

"The perception of an impression is facillitated when the impression is preceded by a warning which announces beforehand that it is about to occur. This case is realized whenever several stimuli follow each other at equal intervals, - when, e.g. we note pendulum movements by the eye, or pendulum-strokes by the ear. Each single stroke forms here the signal for the next, which is thus met by a fully⁶² prepared attention. The same thing happens when the stimulus to be perceived is preceded, at a certain interval, by a single warning: the time is always notably²⁰⁷ shortened. . . . I have made comparative observations on reaction-time with and without a warning signal. The impression to be reacted on was the sound made by the dropping of a ball on the board of the 'drop apparatus²⁰⁸.' . . . . In a first series no warning preceded the stroke of the ball; in the second, the noise made by the apparatus in liberating²⁰⁹ the ball served as a signal. . . . Here are the averages of two series of such experiments:

" . . . In a long series of experiments, (the interval between warning and stimulus remaining the same) the reaction-time grows less and less, and it is possible occasionally to reduce it to a vanishing quantity (a few thousandths of a second), to zero, or even to a negative value.30 . . . The only ground that we can assign for this phenomenon is the preparation (vorbereitende Spannung) of the attention. It is easy to understand that the reaction-time should be shortened by this means; but that is should sometimes sink to zero and even assume negative values, may appear surprising. Nevertheless this latter case is also explained by what happens in the simple reaction-time experiments" just referred to, in which, "when the strain of the attention has reached
its climax²¹⁰, the movement we stand ready to execute escapes from the control of our will, and we register a wrong signal. In these other experiments, in which a warning foretells²¹¹ the moment of the stimulus, it is also plain that attention accommodates itself so exactly to the latter's reception that no sooner is it objectively given than it is fully apperceived, and with the apperception the motor discharge coincides."31

Usually, when the impression is fully anticipated, attention prepares the motor centres so completely for both stimulus and reaction that the only time lost is that of the physiological²¹² conduction downwards²¹³. But even this interval may disappear, i.e. the stimulus and reaction may become objectively contemporaneous; or more remarkable²¹⁴ still, the reaction may be discharged before the stimulus has actually occurred.32 Wundt, as we saw some pages back (p. 411), explains this by the effort of the mind so to react that we may feel our own movement and the signal which prompts it, both at the same instant. As the execution of the movement must precede our feeling of it, so it must also precede the stimulus, if that and our movement are to be felt at once.

The peculiar theoretic interest of these experiments lies in their showing expectant attention and sensation to be continuous or identical processes, since they may have identical motor effects. Although other exceptional observations show them likewise to be continuous subjectively. Wundt's experiments do not: he seems never, at the moment of reacting prematurely²¹⁵, to have been misled into the belief that the real stimulus was there.

As concentrated attention accelerates perception, so, conversely, perception of a stimulus is retarded²¹⁶ by anything which either baffles or distracts the attention with which we await it.

"If, e.g., we make reactions on a sound in such a way that weak and strong stimuli irregularly alternate so that the observer can never expect a determinate strength with any certainty, the reaction-time for all for various signals is increased, - and so is the average error. I append two examples. . . . In Series I a strong and a weak sound alternated regularly, so that the intensity was each time known in advance. In II they came irregularly.

"Still greater is the increase of the time when, unexpectedly into a series of strong impressions, a weak one is interpolated, or vice¹⁴⁸ versâ. In this way I have seen the time of reaction upon a sound so weak as to be barely perceived rise to 0.4" or 0.5", and for a strong sound to 0.25". It is also matter of general experience that a stimulus expected in a general way, but for whose intensity attention cannot be adapted in advance, demands a longer reaction-time. In such cases . . . the reason for the difference can only lie in the fact that wherever a preparation of the attention is impossible, the time of both perception and volition²¹⁸ is prolonged. Perhaps also the conspicuously²¹⁹ large reaction-times which are got with stimuli so faint as to be just perceptible may be explained by the attention tending always to adapt itself for something more than this minimal amount of stimulus, so that a state ensues similar to that in the case of unexpected stimuli. . . . Still more than by previously²²⁰ unknown stimuli is the reaction-time prolonged by wholly unexpected impressions. This is sometimes accidentally brought about, when the observer's attention, instead of being concentrated on the coming signal, is dispersed. It can be realized purposely by suddenly thrusting into a long series of equidistant stimuli a much shorter interval which the observer does not expect. The mental effect here is like that of being startled; - often the startling is outwardly visible. The time of reaction may then easily be lengthened²²¹ to one quarter of a second with strong signals, or with weak ones to a half-second. Slighter, but still very noticeable, is the retardation when the experiment is so arranged that the observer, ignorant whether the stimulus is to be an impression of light, sound, or touch, cannot keep his attention turned to any particular sense-organ in advance. One notices then at the same time a peculiar unrest, as the feeling of strain which accompanies the attention keeps vacillating between the several senses.

"Complications of another sort arise when what is registered is an impression anticipated both in point of quality and strength, but accompanied by other stimuli which make the concentration of the attention difficult. The reaction-time is here always more or less prolonged. The simplest case of the sort is where a momentary²²² impression is registered in the midst of another, and continuous, sensorial-stimulation²²³ of considerable strength. The continuous stimulus may belong to the same sense as the stimulus to be reacted on, or to another. When it is of the same sense, the retardation it causes may be partly due to the distraction of the attention by it, but partly also to the fact that the stimulus to be reacted on stands out less strongly than if alone, and practically becomes a less intense sensation. But other factors in reality are present; for we find the reaction-time more prolonged by the concomitant stimulation when the stimulus is weak than when it is strong. I made experiments in which the principal impression, or signal for reaction, was a bell-stroke whose strength could be graduated by a spring against the hammer with a movable counterpoise. Each set of observations comprised two series; in one of which the bell-stroke was registered in the ordinary way, whilst in the other a toothed wheel belonging to the chronometric apparatus made during the entire experiment a steady noise against a metal spring. In one half of the latter series (A) the bell-stroke was only moderately strong, so that the accompanying noise diminished it considerably²²⁴, without, however, making it indistinguishable. In the other half (B) the bell-sound was so loud as to be heard with perfect distinctness above the noise.

"Since, in these experiments, the sound B even with noise made a considerably stronger impression than the sound A without, we must see in the figures a direct influence of the disturbing noise on the process of reaction. This influence is freed from mixture with other factors when the momentary stimulus and the concomitant disturbance²²⁵ appeal to different senses. I chose, to test this, sight and hearing. The momentary signal was an induction-spark leaping from one platinum²²⁶ point to another against a dark background. The steady stimulation was the noise above described.

"When one reflects that in the experiments with one and the same sense the relative intensity of the signal is always depressed²²⁷ [which by itself is a retarding²²⁸ condition] the amount of retardation in these last observations makes it probable that the disturbing influence upon attention is greater when the stimuli are disparate than when they belong to the same sense. One does not, in fact, find it particularly hard to register immediately, when the bell rings in the midst of the noise; but when the spark is the signal one has a feeling of being coerced²²⁹, as one turns away from the noise towards it. This fact is immediately con- nected with other properties of our attention. The effort of the latter is accompanied by various corporeal²³⁰ sensations, according to the sense which is engaged. The innervation which exists during the effort of attention is therefore probably a different one for each sense-organ."33

Wundt then, after some theoretical remarks which we need not quote now, gives a table of retardations, as follows:

Retardation.
1. Unexpected strength of impression:
a) Unexpectedly strong sound . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  . . . . 0.073
b) Unexpectedly weak sound. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  . .  . . . 0.171
2. Interference by like stimulus (sound by sound) . . . . . . . . . . . . . . . . . . . . . . .  . . . . .0.04534
3. Interference by unlike stimulus (light by sound). . . . . . . . . . . . . . . . . . . . . . . . . . . . 0.078

It seems probable, from these results obtained with elementary processes of mind, that all processes, even the higher ones of reminiscence, reasoning, etc., whenever attention is concentrated upon them instead of being diffused²³¹ and languid, are thereby²³² more rapidly performed.35

Still more interesting reaction-time observations have been made by Münsterberg. The reader will recollect²⁰¹ the fact noted in Chapter III (p. 93) that reaction-time is shorter when one concentrates his attention on the expected movement than when one concentrates it on the expected signal. Herr Münsterberg found that this is equally the case when the reaction is no simple reflex, but can take place only after an intellectual operation. In a series of experiments the five fingers were used to react with, and
the reacter had to use a different finger according as the signal was of one sort or another. Thus when a word in the nominative case was called out he used the thumb, for the dative he used another finger; similarly adjectives, substantives²³⁴, pronouns, numerals, etc., or, again, towns, rivers, beasts, plants, elements; or poets, musicians, philosophers, etc., were co-ordinated each with its finger, so that when a world belonging to either of these classes was mentioned, a particular finger and no other had to perform the reaction. In a second series of experiments the reaction consisted in the utterance²³⁵ of a word in answer to a question, such as "name an edible²³⁶ fish," etc.; or "name the first drama of Schiller," etc.; or "which is greater, Hume or Kant?" etc.; or (first naming apples and cherries, and several other fruits) "which do you prefer, apples or cherries?" etc.; or "which is Goethe's finest drama?" etc.; or "which letter comes the later in the alphabet, the letter L or the first letter of the most beautiful tree?" etc.; or "which is less, 15 or 20 minus 8?"36 etc. etc. etc. Even in this series of reactions the time was much quicker when the reacter turned his attention in advance towards the answer than when he turned it towards the question. The shorter reaction-time was seldom more than one fifth of a second; the longer, from four to eight times as long.

To understand such results, one must bear in mind that in these experiments the reacter always knew in advance in a general way the kind of question which he was to receive, and consequently the sphere within which his possible answer lay.37 In turning his attention, therefore, from the outset towards the answer, those brain-processes in him which were connected with this entire 'sphere' were kept sub-excited, and the question could then discharge with a minimum amount of lost time that particular answer out of the 'sphere' which belonged especially to it. When, on the contrary, the attention was kept looking towards the question exclusively and averted²³⁷ from the possible reply, all this preliminary sub-excitement of motor tracts²¹⁷ failed to occur, and the entire process of answering had to be gone through with after the question was heard. No wonder that the time was prolonged. It is a beautiful example of the summation¹⁹ of stimulations, and of the way in which expectant attention, even when not very strongly focalized, will prepare the motor centres, and shorten the work which a stimulus has to perform on them, in order to produce a given effect when it comes.
The Intimate Nature of the Attentive Process.

We have now a sufficient number of facts to warrant our considering this more recondite²³⁸ question. And two physiological processes, of which we have got a glimpse, immediately suggest themselves as possibly forming in combination a complete reply. I mean

1. The accommodation or adjustment of the sensory²³⁹ organs; and
2. The anticipatory²⁴⁰ preparation from within of the ideational centres concerned with the object to which the attention is paid.

1. The sense-organ and the bodily muscles which favor their exercise are adjusted most energetically in sensorial attention, whether immediate and reflex, or derived. But there are good grounds for believing that even intellectual attention, attention to the idea of a sensible object, is also accompanied with some degree of excitement of the sense-organs to which the object appeals. The preparation of the ideational centres exists, on the other hand, wherever our interest in the object - be it sensible or ideal - is derived from, or in any way connected with, other interests, or the presence of other objects, in the mind. It exists as well when the attention thus derived is classed as passive as when it is classed as voluntary. So that on the whole we may confidently conclude - since in mature life we never attend to anything without our interest in it being in some degree derived from its connection with other objects - that the two processes of sensorial adjustment and ideational preparation probably coexist in all our concrete attentive acts.

The two points must now be proved in more detail. First, as respects the sensorial adjustment.

That it is present when we attend to sensible things is obvious. When we look or listen we accommodate our eyes and ears involuntarily, and we turn our head and body as well; when we taste or smell we adjust the tongue, lips and respiration²⁴¹ to the object; in feeling a surface we move the palpatory organ in a suitable way; in all these acts, besides making involuntary muscular contractions²⁴² of a positive sort, we inhibit³⁴ others which might interfere⁶⁹ with the result - we close the eyes in tasting, suspend the respiration in listening, etc. The result is a more or less massive organic feeling that attention is going on. This organic feeling comes, in the way described on page 302, to be contrasted with that of the objects which it accompanies, and regarded as peculiarly ours, whilst the objects form the not-me. We treat it as a sense of our own activity, although it comes in to us from our organs after they are accommodated, just as the feeling of any object does. Any object, if immediately exciting, causes a reflex accommodation of the sense-organ, and this has two results - first, the object's increase in clearness; and second, the feeling of activity in question. Both are sensations of an 'afferent' sort.

But in intellectual attention, as we have already seen, (p. 300), similar feelings of activity occur. Fechner was the first, I believe, to analyze these feelings, and discriminate them from the stronger ones just named. He writes:

"When we transfer the attention from objects of one sense to those of another, we have an indescribable feeling (though at the same time one perfectly determinate, and reproducible at pleasure), of altered direction or differently localized tension (Spannung). We feel a strain forward in the eyes, one directed sidewise in the ears, increasing with the degree of our attention, and changing according as we look at an object carefully, or listen to something attentively²⁰⁰; and we speak accordingly of straining the attention. The difference is most plainly felt when the attention oscillates rapidly between eye and ear; and the feeling localizes itself with most decided²⁴³ difference in regard to the various sense-organs, according as we wish to discriminate a thing delicately by touch, taste, or smell.

"But now I have, when I try to vividly²⁴⁴ recall a picture of memory or fancy, a feeling perfectly analogous to that which I experience when I seek to apprehend a thing keenly by eye or ear; and this analogous feel- ling is very differently localized. While in sharpest possible attention to real objects (as well as to after-images) the strain is plainly forwards, and when the attention changes from one sense to another only alters its direction between the several external sense-organs, leaving the rest of the head free from strain, the case is different in memory or fancy, for here the feeling withdraws entirely from the external sense-organs, and seems rather to take refuge in that part of the head which the brain fills; if I wish, for example, to recall a place or person it will arise before me with vividness, not according as I strain my attention forwards, but rather in proportion as I, so to speak, retract²⁴⁵ it backwards²⁴⁶."38

In myself the 'backward retraction²⁴⁷' which is felt during attention to ideas of memory, etc., seems to be principally constituted by the feeling of an actual rolling outwards²⁴⁸ and upwards²⁴⁹ of the eyeballs, such as occurs in sleep, and in the exact opposite of their behavior when we look at a physical thing. I have already spoken of this feeling on page 300.39 The reader who doubts the presence of these organic feelings is requested to read the whole of that passage again.

It has been said, however, that we may attend to an object on the periphery²⁵⁰ of the visual field and yet not accommodate the eye for it. Teachers thus notice the acts of children in the school-room at whom they appear not to be looking. Women in general train their peripheral²⁵¹ visual attention more than men. This would be an objection to the invariable and universal presence of movements of adjustment as ingredients of the attentive process. Usually, as is well known, no object lying in the marginal portions of the field of vision can catch our attention without at the same time 'catching²⁵² our eye' - that is, fatally provoking such movements of rotation²⁵³ and accommodation as will focus its image on the fovea, or point of greatest sensibility. Practice, however, enables us, with effort, to attend to a marginal object whilst keeping the eyes immovable. The object under these circumstances never becomes perfectly distinct - the place of its image on the retina makes distinctness impossible - but (as anyone can satisfy himself by trying) we become more vividly conscious of it than we were before the effort was made. Helmholtz states the fact so strikingly that I will quote his observation in full. He was trying to combine in a single solid percept pairs of stereoscopic pictures illuminated²⁵⁵ instantaneously by the electric spark. The pictures were in a dark box which the spark from time to time lighted up; and, to keep the eyes from wandering betweenwhiles, a pin-hole was pricked²⁵⁶ through the middle of each picture, through which the light of the room came, so that each eye had presented to it during the dark intervals a single bright point. With parallel optical axes the points combined into a single image; and the slightest movement of the eyeballs was betrayed by this image at once becoming double. Helmholtz now found that simple linear figures could, when the eyes were thus kept immovable, be perceived as solids at a single flash of the spark. But when the figures were complicated photographs, many successive flashes were required to grasp their totality.

"Now it is interesting," he says, "to find that, although we keep steadily fixating the pin-holes and never allow their combined image to break into two, we can, nevertheless, before the spark comes, keep our attention voluntarily turned to any particular portion we please of the dark field, so as then, when the spark comes, to receive an impression only from such parts of the picture as lie in this region. In this respect, then, our attention is quite independent of the position and accommodation of the eyes, and of any known alteration in these organs; and free to direct itself by a conscious and voluntary effort upon any selected portion of a dark and undifferentiated field of view. This is one of the most important observations for a future theory of attention."40

Hering, however, adds the following detail:

"Whilst attending to the marginal object we must always," he says, "attend at the same time to the object directly fixated. If even for a single instant we let the latter slip out of our mind, our eye moves towards the former, as may be easily recognized by the after-images produced, or by the muscular sounds heard. The case is then less properly to be called one of translocation, than one of unusually wide dispersion, of the attention, in which dispersion the largest share still falls upon the thing directly looked at,"41

and consequently directly accommodated for. Accommodation exists here, then, as it does elsewhere, and without it we should lose a part of our sense of attentive activity. In fact, the strain of that activity (which is remarkably²⁵⁷ great in the experiment) is due in part to unusually strong contractions of the muscles needed to keep the eyeballs still, which produce unwonted feelings of pressure in those organs.

2. But if the peripheral part of the picture in this experiment be not physically²⁵⁸ accommodated for, what is meant by its sharing our attention? What happens when we 'distribute' or 'disperse³¹' the latter upon a thing for which we remain unwilling²⁵⁹ to 'adjust'? This leads us to that second feature in the process, the 'ideational preparation' of which we spoke⁷. The effort to attend to the marginal region of the picture consists in nothing more nor less than the effort to form as clear an idea as is possible of what is there portrayed²⁶¹. The idea is to come to the help of the sensation and make it more distinct. It comes with effort, and such a mode of coming in the remaining part of what we know as our attention's 'strain' under the circumstances. Let us show how universally present in our acts of attention this reinforcing imagination, this inward reproduction, this anticipatory thinking of the thing we attend to, is.

It must as a matter of course be present when the attention is of the intellectual variety, for the thing attended to then is nothing but an idea, an inward reproduction or conception. If then we prove ideal construction of the object to be present in sensorial attention, it will be present everywhere. When, however, sensorial attention is at its height, it is impossible to tell how much of the percept comes from without and how much from within; but if we find that the preparation we make for it always partly consists of the creation of an imaginary duplicate of the object in the mind, which shall stand ready to receive the outward impression as if in a matrix, that will be quite enough to establish the point in dispute.

In Wundt's and Exner's experiments quoted above, the lying in wait for the impressions, and the preparation to react, consist of nothing but the anticipatory imagination of what the impressions or the reactions are to be. Where the stimulus is unknown and the reaction undetermined, time is lost, because no stable image can under such circumstances be formed in advance. But where both nature and time of signal and reaction are foretold²⁶², so completely does the expectant attention consist in premonitory imagination that, as we have seen (pp. 341, note, 373, 377), it may mimic²⁶³ the intensity of reality, or at any rate produce reality's motor effects. It is impossible to read Wundt's and Exner's pages of description and not to interpret the 'Apperception' and 'Spannung' and other terms as equivalents of imagination. With Wundt, in particular, the word Apperception (which he sets great store by) is quite interchangeable with both imagination and attention. All three are names for the excitement from within of ideational brain-centres, for which Mr. Lewes's name of preperception seems the best possible designation.

Where the impression to be caught is very weak, the way not to miss it is to sharpen our attention for it by preliminary contact with it in a stronger form.

"If we wish to begin to observe overtones, it is advisable, just before the sound which is to be analyzed²⁶⁴, to sound very softly the note of which we are in search. . . . The piano and harmonium are well fitted for this use, as both give overtones that are strong. Strike upon the piano first the g' [of a certain musical example previously given in the text]; then, when it vibrations²⁶⁵ have objectively ceased, strike powerfully the note c, in whose sound g' is the third overtone, and keep your attention steadily bent upon the pitch of the just heard g'; you will now hear this tone sounding in the midst of the c. . . . If you place the resonator which corresponds to a certain overtone, for example g' of the sound c, against your ear, and then make the note c sound, you will hear g' much strengthened by the reasonator. . . . This strengthening by the resonator can be used to make the naked ear attentive to the sound which it is to catch. For when the resonator is gradually removed, the g' grows weaker; but the attention, once directed to it, holds it now more easily fast, and the observer hears the tone g' now in the natural unaltered sound of the note with his unaided ear."42

Wundt, commenting on experiences of this sort, says that

"on carefully observing, one will always find that one tries first to recall the image in memory of the tone to be heard, and that then one hears it in the total sound. The same thing is to be noticed in weak or fugitive²⁶⁶ visual impressions. Illuminate²⁵⁴ a drawing by electric sparks separated by considerable intervals, and after the first, and often after the second and third spark, hardly anything will be recognized. But the confused image is held fast in memory; each successive illumination completes it; and so at last we attain¹⁶⁸ to a clearer perception. The primary motive to this inward activity proceeds usually from the outer impression itself. We hear a sound in which, from certain associations, we suspect a certain overtone; the next thing is to recall the overtone in memory; and finally we catch it in the sound we hear. Or perhaps we see some mineral substance we have met before; the impression awakens²⁶⁷ the memory-image, which again more or less completely melts with the impression itself. In this way every idea takes a certain time to penetrate to the focus of consciousness. And during this time we always find in ourselves the peculiar feeling of attention. . . . The phenomena show that an adaptation of attention to the impression takes place. The surprise which unexpected impressions give us is due essentially to the fact that our attention, at the moment when the impression occurs, is not accommodated for it. The accommodation itself is of the double sort, relating as it does to the intensity as well as to the quality of the stimulus. Different qualities of impression require disparate adaptations. And we remark that our feeling of the strain of our inward attentiveness²⁶⁸ increases with every increase in the strength of the impressions of whose perceptions we are intent."43

The natural way of conceiving all this is under the symbolic²⁶⁹ form of a brain-cell played upon from two directions. Whilst the object excites it from without, other brain-cells, or perhaps spiritual forces, arouse it from within. The latter influence is the 'adaptation of the attention.' The plenary energy of the brain-cell demands the co-operation of both factors: not when merely present, but when both present and attended to, is the object fully perceived.

A few additional experiences will now be perfectly clear. Helmholtz, for instance, adds this observation to the passage we quoted a while ago concerning the stereoscopic pictures lit by the electric spark.

"These experiments," he says, "are interesting as regards the part which attention plays in the matter of double images. . . . For in pictures so simple that it is relatively difficult for me to see them double, I can succeed in seeing them double, even when the illumination is only instantaneous, the moment I strive to imagine in a lively way how they ought then to look. The influence of attention is here pure; for all eye movements are shut out."44

In another place45 the same writer says:

"When I have before my eyes a pair of stereoscopic drawings which are hard to combine, it is difficult to bring the lines and points that correspond, to cover each other, and with every little motion of the eyes they glide²⁷⁰ apart. But if I chance to gain a lively mental image (Anschauungsbild) of the represented solid form (a thing that often occurs by lucky chance), I then move my two eyes with perfect certainty over the figure without the picture separating again."

Again, writing of retinal rivalry, Helmholtz says:

"It is not a trial of strength between two sensations, but depends on our fixing or failing to fix the attention. Indeed, there is scarcely any phenomenon so well fitted for the study of the causes which are capable of determining the attention. It is not enough to form the conscious intention of seeing first with one eye then with the other; we must form as clear a notion as possible of what we expect to see. Then it will actually appear."46

In figures 37 and 38, where the result is ambiguous, we can make the change from one apparent form to the other by imagining strongly in advance the form we wish to see. Similarly in those puzzles where certain lines in a picture form by their combination an object that has no connection with what the picture ostensibly represents; or indeed in every case where an object is inconspicuous and hard to discern from the background; we may not be able to see it for a long time; but, having once seen it, we can attend to it again whenever we like, on account of the mental duplicate of it which our imagination now bears.

In the meaningless French words 'pas de lieu Rhône que nous,' who can recognize immediately the English 'paddle your own canoe'?47 But who that has once noticed the identity can fail to have it arrest his attention again? When watching for the distant clock to strike, our mind is so filled with its image that at every moment we think we hear the longed-for dreaded²⁷² sound. So of an awaited footstep. Every stir in the wood is for the hunter his game; for the fugitive his pursuers. Every bonnet in the street is momentarily taken by the lover to enshroud the head of his idol²⁷³. The image in the mind is the attention; the preperception, as Mr. Lewes calls it, is half of the perception of the looked-for thing.48

It is for this reason that men have no eyes but for those aspects of things which they have already been taught to discern. Any one of us can notice a phenomenon after it has once been pointed²⁷⁴ out, which not one in ten thousand could ever have discovered for himself. Even in poetry and the arts, some one has to come and tell us what aspects we may single out, and what effects we may admire, before our æsthetic nature can 'dilate²⁷⁵' to its full extent and never 'with the wrong emotion.' In kindergarten instruction one of the exercises is to make the children see how many features they can point out in such an object as a flower or a stuffed bird. They readily name the features they know already, such as leaves, tail, bill, feet. But they may look for hours without distinguishing nostrils²⁷⁶, claws, scales, etc., until their attention is called to these details; thereafter, however, they see them every time. In short, the only things which we commonly see are those which we preperceive, and the only things which we preperceive are those which have been labelled for us, and the labels stamped into our mind. If we lost our stock of labels we should be intellectually lost in the midst of the world.

Organic adjustment, then, and ideational preparation or preperception are concerned in all attentive acts. An interesting theory is defended by no less authorities than Professors Bain49 and Ribot,50 and still more ably advocated by Mr. N. Lange,51 who will have it that the ideational preparation itself is a consequence of muscular adjustment, so that the latter may be called the essence of the attentive process throughout. This at least is what the theory of these authors practically amounts to, though the former two do not state it in just these terms. The proof consists in the exhibition of cases of intellectual attention which organic adjustment accompanies, or of objects in thinking which we have to execute a movement. Thus Lange says that when he tries to imagine a certain colored circle, he finds himself first making with his eyes the movement to which the circle corresponds, and then imagining the color, etc., as a consequence of the movement.

"Let my reader," he adds, "close his eyes and think of an extended object, for instance a pencil. He will easily notice that he first makes a slight movement [of the eyes] corresponding to the straight line, and that he often gets a weak feeling of innervation of the hand as if touching²⁷⁷ the pencil's surface. So, in thinking of a certain sound, we turn towards its direction or repeat muscularly its rhythm, or articulate an imitation of it."52

But it is one thing to point out the presence of muscular contractions as constant concomitants of our thoughts, and another thing to say, with Herr Lange, that thought is made possible by muscular contraction alone. It may well be that where the object of thought consists of two parts, one perceived by movement and another not, the part perceived by movement is habitually called up first and fixed in the mind by the movement's execution, whilst the other part comes secondarily as the movement's mere associate. But even were this the rule with all men (which I doubt53), it would only be a practical habit, not an ultimate necessity. In the chapter on the Will we shall learn that movements themselves are results of images coming before the mind, images sometimes of feelings in the moving part, sometimes of the movement's effects on eye and ear, and sometimes (if the movement be originally reflex or instinctive), of its natural stimulus or exciting cause. It is, in truth, contrary to all wider and deeper analogies to deny that any quality of feeling whatever can directly rise up in the form of an idea, and to assert that only ideas of movement can call other ideas to the mind.

So much for adjustment and preperception. The only third process I can think of as always present is the inhibition of irrelevant movements and ideas. This seems, however, to be a feature incidental to voluntary attention rather than the essential feature of attention at large,54 and need not concern us particularly now. Noting merely the intimate connection which our account so far establishes between attention, on the one hand, and imagination, discrimination, and memory, on the other, let us draw a couple of practical inferences, and then pass to the more speculative²⁷⁸ problem that remains.

The practical inferences are pedagogic. First, to strengthen attention in children who care nothing for the subject they are studying and let their wits go wool-gathering. The interest here must be 'derived' from something that the teacher associates with the task, a reward or a punishment if nothing less external comes to mind. Prof. Ribot says:

"A child refuses to read; he is incapable²⁷⁹ of keeping his mind fixed on the letters, which have no attraction for him; but he looks with avidity upon the pictures contained in a book. 'What do they mean?' he asks. The father replies: 'When you can read, the book will tell you.' After several colloquies²⁸⁰ like this, the child resigns himself and falls to work, first slackly, then the habit grows, and finally he shows an ardor²⁸¹ which has to be restrained. This is a case of the genesis of voluntary attention. An artificial and indirect desire has to be grafted²⁸² on a natural and direct one. Reading has no immediate attractiveness, but is has a borrowed one, and that is enough. The child is caught in the wheelwork, the first step is made."

I take another example, from M. B. Perez:55

"A child of six years, habitually prone²⁸³ to mind-wandering, sat down one day to the piano of his own accord to repeat an air by which his mother had been charmed. His exercises lasted an hour. The same child at the age of seven, seeing his brother busy with tasks in vacation, went and sat at his father's desk. 'What are you doing there?' his nurse said, surprised at so finding him. 'I am,' said the child, 'learning a page of German; it isn't very amusing, but it is for an agreeable surprise to mamma.'"

Here, again, a birth of voluntary attention, grafted this time on a sympathetic instead of a selfish sentiment like that of the first example. The piano, the German, awaken no spontaneous attention; but they arouse and maintain it by borrowing a force from elsewhere.56

Second, take that mind-wandering which at a later age may trouble us whilst reading or listening to a discourse²⁸⁴. If attention be the reproduction of the sensation from within, the habit of reading not merely with the eye, and of listening not merely with the ear, but of articulating to one's self the words seen or heard, ought to deepen one's attention to the latter. Experience shows that this is the case. I can keep my wandering mind a great deal more closely upon a conversation or a lecture if I actively re-echo to myself the words than if I simply hear them; and I find a number of my students who report benefit from voluntarily adopting a similar course.57

Second, a teacher who wishes to engage the attention of his class must knit his novelties on to things of which they already have preperceptions. The old and familiar is readily attended to by the mind and helps to hold in turn the new, forming, in Herbartian phraseology, an 'Apperceptionsmasse' for it. Of course it is in every case a very delicate problem to know what 'Apperceptionsmasse' to use. Psychology²⁸⁵ can only lay down the general rule.
Is Voluntary Attention a Resultant or a Force?

When, a few pages back, I symbolized²⁸⁶ the 'ideational preparation' element in attention by a brain-cell played upon from within, I added 'by other brain-cells, or by some spiritual force,' without deciding which. The question 'which?' is one of those central psychologic mysteries which part the schools. When we reflect that the turnings of our attention form the nucleus²⁸⁷ of our inner self; when we see (as in the chapter on the Will we shall see) that volition is nothing but attention; when we believe that our autonomy in the midst of nature depends on our not being pure effect, but a cause,-
Principium quoddam quod fati fœdera rumpat,
Ex infinito ne causam causa sequatur-

we must admit that the question whether attention involve such a principle of spiritual activity or not is metaphysical as well as psychological, and is well worthy of all the pains we can bestow¹⁸¹ on its solution. It is in fact the pivotal question of metaphysics, the very hinge on which our picture of the world shall swing from materialism²⁸⁸, fatalism, monism, towards spiritualism, freedom, pluralism, - or else the other way.

It goes back to the automaton-theory. If feeling is an inert²⁸⁹ accompaniment, then of course the brain-cell can be played upon only by other brain-cells, and the attention which we give at any time to any subject, whether in the form of sensory adaptation or of 'preperception,' is the fatally predetermined effect of exclusively material laws. If, on the other hand, the feeling which coexists with the brain-cells' activity reacts dynamically upon that activity, furthering or checking it, then the attention is in part, at least, a cause. It does not necessarily follow, of course, that this reactive feeling should be 'free' in the sense of having its amount and direction undertermined in advance, for it might very well be predetermined in all these particulars. If it were so, our attention would not be materially determined, nor yet would it be 'free' in the sense of being spontaneous or unpredictable in advance. The question is of course a purely²⁹⁰ speculative one, for we have no means of objectively ascertaining²⁹¹ whether our feelings react on our nerve-processes or not; and those who answer the question in either way do so in consequence of general analogies and presumptions²⁹² drawn from other fields. As mere conceptions, the effect-theory and the cause-theory of attention are equally clear; and whoever affirms either conception to be true must do so on metaphysical or universal rather than on scientific or particular grounds.

As regards immediate sensorial attention hardly any one is tempted²⁹³ to regard it as anything but an effect.58 We are 'evolved' so as to respond to special stimuli by special accommodative acts which produce clear perceptions on the one hand in us, and on the other hand such feelings of inner activity as were above described. The accommodation and the resultant feeling are the attention. We don't bestow it, the object draws it from us. The object has the initiative, not the mind.

Derived attention, where there is no voluntary effort, seems also most plausibly²⁹⁴ to be a mere effect. The object again takes the initiative and draws our attention to itself, not by reason of its own intrinsic interest, but because it is connected with some other interesting thing. Its brain-process is connected with another that is either excited, or tending to be excited, and the liability to share the excitement and become aroused is the liability to 'preperception' in which the attention consists. If I have received an insult, I may not be actively thinking of it all the time, yet the thought of it is in such a state of heightened irritability²⁹⁵, that the place where I received it or the man who inflicted²⁹⁶ it cannot be mentioned in my hearing without my attention bounding, as it were, in that direction, as the imagination of the whole transaction revives. Where such a stirring-up occurs, organic adjustment must exist as well, and the ideas must innervate to some degree the muscles. Thus the whole process of involuntary derived attention is accounted for if we grant that there is something interesting enough to arouse and fix the thought of whatever may be connected with it. This fixing is the attention; and it carries with it a vague sense of activity going on, and of acquiescence²⁹⁷, furtherance, and adoption²⁹⁸, which makes us feel the activity to be our own.

This reinforcement of ideas and impressions by the pre-existing contents of the mind was what Herbart had in mind when he gave the name of apperceptive attention to the variety we describe. We easily see now why the lover's tap should be heard - it finds a nerve-centre half ready in advance to explode. We see how we can attend to a companion's voice in the midst of noises which pass unnoticd [sic] though objectively much louder than the words we hear. Each word is doubly awakened; once from without by the lips of the talker, but already before that from within by the premonitory processes irradiating from the previous words, and by the dim arousal of all processes that are connected with the 'topic' of the talk. The irrelevant noises, on the other hand, are awakened only once. They form an unconnected train. The boys at school, inattentive to the teacher except when he begins an anecdote, and then all pricking²⁹⁹ up their ears, are as easily explained. The words of the anecdote shoot into association with exciting objects which react and fix them; the other words do not. Similarly with the gramma heard by the purist and Herbart's other examples quoted on page 418.

Even where the attention is voluntary, it is possible to conceive of it as an effect, and not a cause, a product and not an agent, The things we attend to come to us by their own laws. Attention creates no idea; an idea must already be there before we can attend to it. Attention only fixes and retains what the ordinary laws of association bring 'before the footlights' of consciousness. But the moment we admit this we see that the attention per se, the feeling of attending need no more fix and retain the ideas than it need bring them. The associates which bring them also fix them by the interest which they lend. In short, voluntary and involuntary attention may be essentially the same. It is true that where the ideas are intrinsically very unwelcome and the effort to attend to them is great, it seems to us as if the frequent renewal³⁰⁰ of the effort were the very cause by which they are held fast, and we naturally think of the effort of an original force. In fact it is only to the effort to attend, not to the mere attending, that we are seriously tempted to ascribe spontaneous power. We think we can make more of it if we will; and the amount which we make does not seem a fixed function of the ideas themselves, as it would necessarily have to be if our effort were an effect and not a spiritual force. But even here it is possible to conceive the facts mechanically and to regard the effort as a mere effect.

Effort is felt only where there is a conflict of interests in the mind. The idea A may be intrinsically exciting to us. The idea Z may derive¹¹⁰ its interest from association with some remoter good. A may be our sweetheart, Z may be some condition of our soul's salvation³⁰¹. Under these circumstances, if we succeed in attending to Z at all it is always with expenditure³⁰² of effort. The 'ideational prepararation,' the 'preperception' of A keeps going on of its own accord, whilst that of Z need incessant¹⁵⁰ pulses of voluntary reinforcement - that is, we have the feeling of voluntary reinforcement (or effort) at each successive moment in which the thought of Z flares³⁰³ brightly up in our mind. Dynamically, however, that may mean only this: that the associative processes which make Z triumph are really the stronger, and in A's absence would make us give a 'passive' and unimpeded attention to Z; but, so long as A is present, some of their force is used to inhibit the processes concerned with A. Such inhibition is a partial neutralization³⁰⁴ of the brain-energy which would otherwise be available for fluent thought. But what is lost for thought is converted into feeling, in this case into the peculiar feeling of effort, difficulty, or strain.

The stream of our thought is like a river. On the whole easy simple flowing predominates in it, the drift of things is with the pull of gravity, and effortless attention is the rule. But at intervals an obstruction³⁰⁵, a set-back, a log-jam occurs, stops the current, creates an eddy³⁰⁶, and makes things temporarily move the other way. If a real river could feel, it would feel these eddies³⁰⁷ and set-backs as places of effort. "I am here flowing," it would say, "in the direction of greatest resistance, instead of flowing, as usual, in the direction of least. My effort is what enables me to perform this feat²⁶⁰." Really, the effort would only be a passive index that the feat was being performed. The agent would all the while be the total downward drift of the rest of the water, forcing some of it upwards in this spot; and although, on the average, the direction of least resistance is downwards, that would be no reason for its not being upwards now and then. Just so with our voluntary acts of attention. They are momentary arrests, coupled with a peculiar feeling, or portions of the stream. But the arresting force, instead of being this peculiar feeling itself, may be nothing but the processes by which the collision is produced. The feeling of effort may be 'an accompaniment,' as Mr. Bradley says,' more or less superfluous,' and no more contribute to the result than the pain in a man's finger, when a hammer falls on it, contributes to the hammer's weight. Thus the notion that our effort in attending is an original faculty, a force additional to the others of which brain and mind are the seat, may be an abject³⁰⁸ superstition³⁰⁹. Attention may have to go, like many a faculty once deemed essential, like many a verbal phantom³¹⁰, like many an idol of the tribe. It may be an excrescence on Psychology. No need of it to drag ideas before consciousness or fix them, when we see how perfectly they drag and fix each other there.

I have stated the effect-theory as persuasively³¹¹ as I can.59 It is a clear, strong, well-equiped conception, and like all such, is fitted to carry conviction, where there is no contrary proof. The feeling of effort certainly may be an inert accompaniment and not the active element which it seems. No measurements are as yet performed (it is safe to say none ever will be performed) which can show that it contributes energy to the result. We may then regard attention as a superfluity, or a 'Luxus,' and dogmatize against its causal function with no feeling in our hearts but one of pride that we are applying Occam's razor to an entity²⁷¹ that has multiplied itself 'beyond necessity.'

But Occam's razor, though a very good rule of method, is certainly no law of nature. The laws of stimulation and of association may well be indispensable actors in all attention's performances, and may even be a good enough 'stock-company' to carry on many performances without aid; and yet they may at times simply form the background for a 'star-performer,' who is no more their 'inert accompaniment' or their 'incidental product' than Hamlet is Horatio's and Ophelia's. Such a star-performer would be the voluntary effort to attend, if it were an original psychic³¹² force. Nature may, I say, indulge in these complications; and the conception that she has done so in this case is, I think, just as clear (if not as 'parsimonious³¹³' logically) as the conception that she has not. To justify³¹⁴ this assertion, let us ask just what the effort to attend would effect if it were an original force.

It would deepen and prolong the stay in consciousness of innumerable ideas which else would fade more quickly away. The delay thus gained might not be more than a second in duration - but that second might be critical; for in the constant rising and falling of considerations in the mind, where two associated systems of them are nearly in equilibrium it is often a matter of but a second more or less of attention at the outset, whether one system shall gain force to occupy the field and develop itself, and exclude the other, or be excluded itself by the other. When developed, it may make us act; and that act may seal our doom³¹⁵. When we come to the chapter on the Will, we shall see that the whole drama of the voluntary life hinges on the amount of attention, slightly more or slightly less, which rival motor ideas may receive. But the whole feeling of reality, the whole sting and excitement of our voluntary life, depends on our sense that in it things are really being decided from one moment to another, and that it is not the dull rattling³¹⁶ off of a chain that was forged innumerable ages ago. This appearance, which makes life and history tingle³¹⁷ with such a tragic³¹⁸ zest³¹⁹, may not be an illusion. As we grant to the advocate of the mechanical theory that it may be one, so he must grant to us that it may not. And the result is two conceptions of possibility face to face with no facts definitely enough known to stand as arbiter³²⁰ between them.

Under these circumstances, one can leave the question open whilst waiting for light, or one can do what most speculative minds do, that is, look to one's general philosophy to incline the beam. The believers in mechanism³²¹ do so without hesitation³²², and they ought not to refuse a similar privilege to the believers in a spiritual force. I count myself among the latter, but as my reasons are ethical³²³ they are hardly suited for introduction into a psychological work.60 The last word of psychology here is ignorance, for the 'forces' engaged are certainly too delicate and numerous to be followed in detail. Meanwhile, in view of the strange arrogance³²⁴ with which the wildest materialistic³²⁵ speculations persist in calling themselves 'science,' it is well to recall just what the reasoning is, by which the effect-theory of attention is confirmed. It is an argument from analogy, drawn from rivers, reflex actions and other material phenomena where no consciousness appears exist at all, and extended to cases where consciousness seems the phenomenon's essential feature. The consciousness doesn't count, these reasoners say; it doesn't exist for science, it is nil³²⁶; you mustn't think about it at all. The intensely reckless character of all this needs no comment. It is making the mechanical theory true per fas aut nefas. For the sake of that theory we make inductions³²⁷ from phenomena to others that are startingly unlike them; and we assume that a complication which Nature has introduced (the presence of feeling and of effort, namely) is not worthy of scientific recognition at all. Such conduct may conceivably be wise, though I doubt it; but scientific, as contrasted with metaphysical, it cannot seriously be called.61
Inattention.

Having spoken fully of attention, let me add a word about inattention.

We do not notice the ticking of the clock, the noise of the city streets, or the roaring of the brook³²⁸ near the house; and even the din⁴⁷ of a foundry or factory will not mingle³²⁹ with the thoughts of its workers, if they have been there long enough. When we first put on spectacles, especially if they be of certain curvatures, the bright reflections they give of the windows, etc., mixing with the field of view, are very disturbing. In a few days we ignore them altogether. Various entoptic images, muscœ volitantes, etc., although constantly present, are hardly even known. The pressure of our clothes and shoes, the beating of our hearts and arteries³³⁰, our breathing, certain steadfast³³¹ bodily pains, habitual odors, tastes in the mouth, etc., are examples from other senses, of the same lapse into unconsciousness of any too unchanging content - a lapse which Hobbes has expressed in the well-known phrase, "Semper idem sentire ac non sentire ad idem revertunt."

The cause of the unconciousness is certainly not the mere blunting of the sense-organs. Were the sensation important, we should notice it well enough; and we can at any moment notice it by expressly throwing our attention upon it,62 provided it have not become so inveterate³³² that inattention to it is ingrained in our very constitution, as in the case of the muscœ volitantes the double retinal images, etc. But even in these cases artificial conditions of observation and patience soon give us command of the impression which we seek. The inattentiveness must then be a habit grounded on higher conditions than mere sensorial fatigue.

Helmholtz has formulated a general law of inattention which we shall have to study in the next chapter but one. Helmholtz's law is that we leave all impressions unnoticed which are valueless to us as signs by which to discriminate things. At most such impressions fuse with their consorts³³³ into an aggregate³³⁴ effect. The upper partial tones which make human voices differ make them differ as wholes only - we cannot dissociate the tones themselves. The odors which form integral parts of the characteristic taste of certain substances, meat, fish, cheese, butter, wine, do not come as odors to our attention. The various muscular and tactile feelings that make up the perception of the attributes 'wet,' 'elastic,' 'doughy,' etc., are not singled out separately for what they are. And all this is due to an inveterate habit we have contracted, of passing from them immediately to their import and letting their substantive²³³ nature alone. They have formed connections in the mind which it is now difficult to break; they are constituents³³⁵ of processes which it is hard to arrest, and which differ altogether from what the processes of catching the attention would be. In the cases Helmholtz has in mind, not only we but our ancestors have formed these habits. In the cases we started from, however, of the mill-wheel, the spectacles, the factory, din, the tights shoes, etc., the habits of inattention are more recent, and the manner of their genesis seems susceptible³³⁶, hypothetically at least, of being traced.

How can impressions that are not needed by the intellect be thus shunted off from all relation to the rest of consciousness? Professor G. E. Müller has made a plausible³³⁷ reply to this question, and most of what follows is borrowed from him.63 He begins with the fact that

"When we first come out of a mill or factory, in which we have remained long enough to get wonted to the noise, we feel as if something were lacking. Our total feeling of existence is different from what it was when we were in the mill. . . . A friend writes to me: 'I have in my room a little clock which does not run quite twenty-four hours without winding³³⁸. In consequence of this, it often stops. So soon as this happens, I notice it, whereas I naturally fail to notice it when going. When this first began to happen, there was this modification³³⁹: I suddenly felt an undefined uneasiness or sort of void, without being able to say what was the matter; and only after some consideration did I find the cause in the stopping of the clock.'"

That the stopping of an unfelt stimulus may itself be felt is a well-known fact: the sleeper³⁴⁰ in church who wakes when the sermon ends; the miller³⁴¹ who does the same when his wheel stands still, are stock examples. Now (since every impression falling on the nervous system must propagate itself somewhither), Müller suggests that impressions which come to us when the thought-centres are preoccupied³⁴² with other matters may thereby be blocked or inhibited³⁴³ from invading these centres, and may then overflow³⁴⁴ into lower paths of discharge. And he farther suggests that if this process recur¹⁴⁰ often enough, the side-track thus created will grow so permeable as to be used, no matter what may be going on in the centres above. In the acquired inattention mentioned, the constant stimulus always caused disturbance at first; and consciousness of it was extruded³⁴⁵ successfully only when the brain was strongly excited about other things. Gradually the extrusion³⁴⁶ became easier, and at last automatic.

The side-tracks which thus learn to draft off the stimulations that interfere with thought cannot be assigned with any precision. They probably terminate in organic processes, or insignificant³⁴⁷ muscular contractions which, when stopped by the cessation of their instigating³⁴⁸ cause, immediately give us the feeling that something is gone from our existence (as Müller says), or (as his friend puts it) the feeling of a void.64

Müller's suggestion awakens another. It is a well-known fact that persons striving to keep their attention on a difficult subject will resort to movements of various unmeaning kinds, such as pacing the room, drumming with the fingers, playing with keys or watch-chain, scratching head, pulling mustache, vibrating foot, or what not, according to the individual. There is an anecdote of Sir W. Scott, when a boy, rising to the head of his class by cutting off from the jacket of the usual head-boy a button which the latter was in the habit of twirling in his fingers during the lesson. The button gone, its owner's power of reciting also departed. - Now much of this activity is unquestionably due to the overflow of emotional excitement during anxious and concentrated thought. It drains away nerve-currents which if pent up within the thought-centres would very likely make the confusion there worse confounded. But may it not also be a means of drafting off all the irrelevant sensations of the moment, and so keeping the attention more exclusively concentrated upon its inner task? Each individual usually has his own peculiar habitual movement of this sort. A downward nerve-path is thus kept constantly open during concentrated thought; and as it seems to be a law of frequent (if not of universal) application, that incidental stimuli tend to discharge through paths that are already discharging rather than through others, the whole arrangement might protect the thought-centres from interference from without. Were this the true rationale of these peculiar movements, we should have to suppose that the sensations produced by each phase of the movement itself are also drafted off immediately by the next phase and help to keep the circular process agoing. I offer the suggestion for what it is worth; the connection of the movements themselves with the continued effort of attention is certainly a genuine and curious fact.

1 explicitly   

ad.明确地，显然地

参考例句：

• The plan does not explicitly endorse the private ownership of land. 该计划没有明确地支持土地私有制。
• SARA amended section 113 to provide explicitly for a right to contribution. 《最高基金修正与再授权法案》修正了第123条，清楚地规定了分配权。 来自英汉非文学 - 环境法 - 环境法

2 faculty   

n.才能；学院，系；(学院或系的)全体教学人员

参考例句：

• He has a great faculty for learning foreign languages.他有学习外语的天赋。
• He has the faculty of saying the right thing at the right time.他有在恰当的时候说恰当的话的才智。

3 par   

n.标准，票面价值，平均数量；adj.票面的，平常的，标准的

参考例句：

• Sales of nylon have been below par in recent years.近年来尼龙织品的销售额一直不及以往。
• I don't think his ability is on a par with yours.我认为他的能力不能与你的能力相媲美。

4 motive   

n.动机，目的；adv.发动的，运动的

参考例句：

• The police could not find a motive for the murder.警察不能找到谋杀的动机。
• He had some motive in telling this fable.他讲这寓言故事是有用意的。

5 bent   

n.爱好，癖好；adj.弯的；决心的，一心的

参考例句：

• He was fully bent upon the project.他一心扑在这项计划上。
• We bent over backward to help them.我们尽了最大努力帮助他们。

6 faculties   

n.能力( faculty的名词复数 )；全体教职员；技巧；院

参考例句：

• Although he's ninety, his mental faculties remain unimpaired. 他虽年届九旬，但头脑仍然清晰。
• All your faculties have come into play in your work. 在你的工作中，你的全部才能已起到了作用。 来自《简明英汉词典》

7 spoke   

n.（车轮的）辐条；轮辐；破坏某人的计划；阻挠某人的行动 v.讲，谈（speak的过去式）；说；演说；从某种观点来说

参考例句：

• They sourced the spoke nuts from our company.他们的轮辐螺帽是从我们公司获得的。
• The spokes of a wheel are the bars that connect the outer ring to the centre.辐条是轮子上连接外圈与中心的条棒。

8 poke   

n.刺，戳，袋；vt.拨开，刺，戳；vi.戳，刺，捅，搜索，伸出，行动散慢

参考例句：

• We never thought she would poke her nose into this.想不到她会插上一手。
• Don't poke fun at me.别拿我凑趣儿。

9 interfering   

adj. 妨碍的 动词interfere的现在分词

参考例句：

• He's an interfering old busybody! 他老爱管闲事！
• I wish my mother would stop interfering and let me make my own decisions. 我希望我母亲不再干预，让我自己拿主意。

10 mere   

adj.纯粹的；仅仅，只不过

参考例句：

• That is a mere repetition of what you said before.那不过是重复了你以前讲的话。
• It's a mere waste of time waiting any longer.再等下去纯粹是浪费时间。

11 chaos   

n.混乱，无秩序

参考例句：

• After the failure of electricity supply the city was in chaos.停电后，城市一片混乱。
• The typhoon left chaos behind it.台风后一片混乱。

12 intelligible   

adj.可理解的，明白易懂的，清楚的

参考例句：

• This report would be intelligible only to an expert in computing.只有计算机运算专家才能看懂这份报告。
• His argument was barely intelligible.他的论点不易理解。

13 chaotic   

adj.混沌的，一片混乱的，一团糟的

参考例句：

• Things have been getting chaotic in the office recently.最近办公室的情况越来越乱了。
• The traffic in the city was chaotic.这城市的交通糟透了。

14 discriminate   

v.区别，辨别，区分；有区别地对待

参考例句：

• You must learn to discriminate between facts and opinions.你必须学会把事实和看法区分出来。
• They can discriminate hundreds of colours.他们能分辨上百种颜色。

15 sentient   

adj.有知觉的，知悉的；adv.有感觉能力地

参考例句：

• The living knew themselves just sentient puppets on God's stage.生还者认识到，他们不过是上帝的舞台上有知觉的木偶而已。
• It teaches us to love all sentient beings equally.它教导我们应该平等爱护一切众生。

16 peculiar   

adj.古怪的，异常的；特殊的，特有的

参考例句：

• He walks in a peculiar fashion.他走路的样子很奇特。
• He looked at me with a very peculiar expression.他用一种很奇怪的表情看着我。

17 accomplished   

adj.有才艺的；有造诣的；达到了的

参考例句：

• Thanks to your help,we accomplished the task ahead of schedule.亏得你们帮忙,我们才提前完成了任务。
• Removal of excess heat is accomplished by means of a radiator.通过散热器完成多余热量的排出。

18 connoisseurs   

n.鉴赏家，鉴定家，行家( connoisseur的名词复数 )

参考例句：

• Let us go, before we offend the connoisseurs. 咱们走吧，免得我们惹恼了收藏家。 来自辞典例句
• The connoisseurs often associate it with a blackcurrant flavor. 葡萄酒鉴赏家们通常会将它跟黑醋栗口味联系起来。 来自互联网

19 summation   

n.总和；最后辩论

参考例句：

• The exhibition was a summation of his life's work.这次展览汇集了他一生中典型的作品。
• The defense attorney phrased his summation at last.最后，辩护律师作了辩论总结。

20 eternity   

n.不朽，来世；永恒，无穷

参考例句：

• The dull play seemed to last an eternity.这场乏味的剧似乎演个没完没了。
• Finally,Ying Tai and Shan Bo could be together for all of eternity.英台和山伯终能双宿双飞，永世相随。

21 utterly   

adv.完全地，绝对地

参考例句：

• Utterly devoted to the people,he gave his life in saving his patients.他忠于人民，把毕生精力用于挽救患者的生命。
• I was utterly ravished by the way she smiled.她的微笑使我完全陶醉了。

22 subjective   

a.主观(上)的，个人的

参考例句：

• The way they interpreted their past was highly subjective. 他们解释其过去的方式太主观。
• A literary critic should not be too subjective in his approach. 文学评论家的看法不应太主观。

23 perfectly   

adv.完美地，无可非议地，彻底地

参考例句：

• The witnesses were each perfectly certain of what they said.证人们个个对自己所说的话十分肯定。
• Everything that we're doing is all perfectly above board.我们做的每件事情都是光明正大的。

24 simultaneously   

adv.同时发生地，同时进行地

参考例句：

• The radar beam can track a number of targets almost simultaneously.雷达波几乎可以同时追着多个目标。
• The Windows allow a computer user to execute multiple programs simultaneously.Windows允许计算机用户同时运行多个程序。

25 withdrawal   

n.取回，提款；撤退，撤军；收回，撤销

参考例句：

• The police were forced to make a tactical withdrawal.警方被迫进行战术撤退。
• They insisted upon a withdrawal of the statement and a public apology.他们坚持要收回那些话并公开道歉。

26 distraction   

n.精神涣散，精神不集中，消遣，娱乐

参考例句：

• Total concentration is required with no distractions.要全神贯注，不能有丝毫分神。
• Their national distraction is going to the disco.他们的全民消遣就是去蹦迪。

27 fixed   

adj.固定的，不变的，准备好的；(计算机)固定的

参考例句：

• Have you two fixed on a date for the wedding yet?你们俩选定婚期了吗？
• Once the aim is fixed,we should not change it arbitrarily.目标一旦确定，我们就不应该随意改变。

28 vacancy   

n.（旅馆的）空位，空房，（职务的）空缺

参考例句：

• Her going on maternity leave will create a temporary vacancy.她休产假时将会有一个临时空缺。
• The vacancy of her expression made me doubt if she was listening.她茫然的神情让我怀疑她是否在听。

29 unity   

n.团结，联合，统一；和睦，协调

参考例句：

• When we speak of unity,we do not mean unprincipled peace.所谓团结，并非一团和气。
• We must strengthen our unity in the face of powerful enemies.大敌当前，我们必须加强团结。

30 dispersed   

adj. 被驱散的, 被分散的, 散布的

参考例句：

• The clouds dispersed themselves. 云散了。
• After school the children dispersed to their homes. 放学后，孩子们四散回家了。

31 disperse   

vi.使分散；使消失；vt.分散；驱散

参考例句：

• The cattle were swinging their tails to disperse the flies.那些牛甩动着尾巴驱赶苍蝇。
• The children disperse for the holidays.孩子们放假了。

32 dressing   

n.(食物)调料；包扎伤口的用品，敷料

参考例句：

• Don't spend such a lot of time in dressing yourself.别花那么多时间来打扮自己。
• The children enjoy dressing up in mother's old clothes.孩子们喜欢穿上妈妈旧时的衣服玩。

33 wink   

n.眨眼，使眼色，瞬间；v.眨眼，使眼色，闪烁

参考例句：

• He tipped me the wink not to buy at that price.他眨眼暗示我按那个价格就不要买。
• The satellite disappeared in a wink.瞬息之间，那颗卫星就消失了。

34 inhibit   

vt.阻止，妨碍，抑制

参考例句：

• Don't let ego and greed inhibit clear thinking and hard work.不要让自我和贪婪妨碍清晰的思维和刻苦的工作。
• They passed a law to inhibit people from parking in the street.他们通过一项法令以阻止人们在街上停车。

35 scattered   

adj.分散的，稀疏的；散步的；疏疏落落的

参考例句：

• Gathering up his scattered papers,he pushed them into his case.他把散乱的文件收拾起来，塞进文件夹里。

36 brutes   

兽( brute的名词复数 )； 畜生； 残酷无情的人； 兽性

参考例句：

• They're not like dogs; they're hideous brutes. 它们不像狗，是丑陋的畜牲。
• Suddenly the foul musty odour of the brutes struck his nostrils. 突然，他的鼻尖闻到了老鼠的霉臭味。 来自英汉文学

37 actively   

adv.积极地，勤奋地

参考例句：

• During this period all the students were actively participating.在这节课中所有的学生都积极参加。
• We are actively intervening to settle a quarrel.我们正在积极调解争执。

38 fatigue   

n.疲劳，劳累

参考例句：

• The old lady can't bear the fatigue of a long journey.这位老妇人不能忍受长途旅行的疲劳。
• I have got over my weakness and fatigue.我已从虚弱和疲劳中恢复过来了。

39 monotonous   

adj.单调的，一成不变的，使人厌倦的

参考例句：

• She thought life in the small town was monotonous.她觉得小镇上的生活单调而乏味。
• His articles are fixed in form and monotonous in content.他的文章千篇一律，一个调调儿。

40 lapse   

n.过失，流逝，失效，抛弃信仰，间隔；vi.堕落，停止，失效，流逝；vt.使失效

参考例句：

• The incident was being seen as a serious security lapse.这一事故被看作是一次严重的安全疏忽。
• I had a lapse of memory.我记错了。

41 abolition   

n.废除，取消

参考例句：

• They declared for the abolition of slavery.他们声明赞成废除奴隶制度。
• The abolition of the monarchy was part of their price.废除君主制是他们的其中一部分条件。

42 awaken   

vi.醒，觉醒；vt.唤醒，使觉醒，唤起，激起

参考例句：

• Old people awaken early in the morning.老年人早晨醒得早。
• Please awaken me at six.请于六点叫醒我。

43 awakening   

n.觉醒，醒悟 adj.觉醒中的；唤醒的

参考例句：

• the awakening of interest in the environment 对环境产生的兴趣
• People are gradually awakening to their rights. 人们正逐渐意识到自己的权利。

44 stimulus   

n.刺激，刺激物，促进因素，引起兴奋的事物

参考例句：

• Regard each failure as a stimulus to further efforts.把每次失利看成对进一步努力的激励。
• Light is a stimulus to growth in plants.光是促进植物生长的一个因素。

45 alteration   

n.变更，改变；蚀变

参考例句：

• The shirt needs alteration.这件衬衣需要改一改。
• He easily perceived there was an alteration in my countenance.他立刻看出我的脸色和往常有些不同。

46 exclusion   

n.拒绝，排除，排斥，远足，远途旅行

参考例句：

• Don't revise a few topics to the exclusion of all others.不要修改少数论题以致排除所有其他的。
• He plays golf to the exclusion of all other sports.他专打高尔夫球，其他运动一概不参加。

47 din   

n.喧闹声，嘈杂声

参考例句：

• The bustle and din gradually faded to silence as night advanced.随着夜越来越深，喧闹声逐渐沉寂。
• They tried to make themselves heard over the din of the crowd.他们力图让自己的声音盖过人群的喧闹声。

48 apprehension   

n.理解，领悟；逮捕，拘捕；忧虑

参考例句：

• There were still areas of doubt and her apprehension grew.有些地方仍然存疑，于是她越来越担心。
• She is a girl of weak apprehension.她是一个理解力很差的女孩。

49 apprehended   

逮捕，拘押( apprehend的过去式和过去分词 )； 理解

参考例句：

• She apprehended the complicated law very quickly. 她很快理解了复杂的法律。
• The police apprehended the criminal. 警察逮捕了罪犯。

50 apprehend   

vt.理解，领悟，逮捕，拘捕，忧虑

参考例句：

• I apprehend no worsening of the situation.我不担心局势会恶化。
• Police have not apprehended her killer.警察还未抓获谋杀她的凶手。

51 preclude   

vt.阻止，排除，防止；妨碍

参考例句：

• We try to preclude any possibility of misunderstanding.我们努力排除任何误解的可能性。
• My present finances preclude the possibility of buying a car.按我目前的财务状况我是不可能买车的。

52 interval   

n.间隔，间距；幕间休息，中场休息

参考例句：

• The interval between the two trees measures 40 feet.这两棵树的间隔是40英尺。
• There was a long interval before he anwsered the telephone.隔了好久他才回了电话。

53 ambiguity   

n.模棱两可；意义不明确

参考例句：

• The telegram was misunderstood because of its ambiguity.由于电文意义不明确而造成了误解。
• Her answer was above all ambiguity.她的回答毫不含糊。

54 standing   

n.持续，地位；adj.永久的，不动的，直立的，不流动的

参考例句：

• After the earthquake only a few houses were left standing.地震过后只有几幢房屋还立着。
• They're standing out against any change in the law.他们坚决反对对法律做任何修改。

55 simplicity   

n.简单，简易；朴素；直率，单纯

参考例句：

• She dressed with elegant simplicity.她穿着朴素高雅。
• The beauty of this plan is its simplicity.简明扼要是这个计划的一大特点。

56 minor   

adj.较小(少)的，较次要的；n.辅修学科；vi.辅修

参考例句：

• The young actor was given a minor part in the new play.年轻的男演员在这出新戏里被分派担任一个小角色。
• I gave him a minor share of my wealth.我把小部分财产给了他。

57 bonnet   

n.无边女帽；童帽

参考例句：

• The baby's bonnet keeps the sun out of her eyes.婴孩的帽子遮住阳光，使之不刺眼。
• She wore a faded black bonnet garnished with faded artificial flowers.她戴着一顶褪了色的黑色无边帽，帽上缀着褪了色的假花。

58 amplifies   

放大，扩大( amplify的第三人称单数 )； 增强； 详述

参考例句：

• Gain is the number of times the amplifier amplifies a signal. 增益就是放大器放大信号的倍数。
• Such panicky behaviour amplifies the impact of the Russian export ban. 这样的恐慌行为放大了俄罗斯小麦出口禁令的影响效应。

59 converge   

vi.会合；聚集，集中；(思想、观点等)趋近

参考例句：

• The results converge towards this truth.其结果趋近于这个真理。
• Parallel lines converge at infinity.平行线永不相交。

60 harmoniously   

和谐地，调和地

参考例句：

• The president and Stevenson had worked harmoniously over the last eighteen months. 在过去一年半里，总统和史蒂文森一起工作是融洽的。
• China and India cannot really deal with each other harmoniously. 中国和印度这两只猛兽不可能真心实意地和谐相处。

61 discrepant   

差异的

参考例句：

• A HANDING FEE OF USD80. 00 TO BE DEDUCTED FOR ALL DISCREPANT. 有不符点的单据将收取80美元的费用。
• As the process, modern standard ought to be discrepant, grading. 作为过程，现代化的标准应当是有差异的、分阶段的。

62 fully   

adv.完全地，全部地，彻底地；充分地

参考例句：

• The doctor asked me to breathe in,then to breathe out fully.医生让我先吸气，然后全部呼出。
• They soon became fully integrated into the local community.他们很快就完全融入了当地人的圈子。

63 heterogeneous   

adj.庞杂的；异类的

参考例句：

• There is a heterogeneous mass of papers in the teacher's office.老师的办公室里堆满了大批不同的论文。
• America has a very heterogeneous population.美国人口是由不同种族组成的。

64 multiplications   

增多( multiplication的名词复数 )； 增加； 乘； 繁殖

参考例句：

• The optimum paths for multiplications of 7 and 8 are depicted in Figure 6.17. 图6．17中描绘了倍增7倍和8倍的最优路径。

65 momentum   

n.动力，冲力，势头；动量

参考例句：

• We exploit the energy and momentum conservation laws in this way.我们就是这样利用能量和动量守恒定律的。
• The law of momentum conservation could supplant Newton's third law.动量守恒定律可以取代牛顿第三定律。

66 entirely   

ad.全部地，完整地；完全地，彻底地

参考例句：

• The fire was entirely caused by their neglect of duty. 那场火灾完全是由于他们失职而引起的。
• His life was entirely given up to the educational work. 他的一生统统献给了教育工作。

67 habitual   

adj.习惯性的；通常的，惯常的

参考例句：

• He is a habitual criminal.他是一个惯犯。
• They are habitual visitors to our house.他们是我家的常客。

68 dictating   

v.大声讲或读( dictate的现在分词 )；口授；支配；摆布

参考例句：

• The manager was dictating a letter to the secretary. 经理在向秘书口授信稿。 来自辞典例句
• Her face is impassive as she listens to Miller dictating the warrant for her arrest. 她毫无表情地在听米勒口述拘留她的证书。 来自辞典例句

69 interfere   

v.(in)干涉，干预；(with)妨碍，打扰

参考例句：

• If we interfere, it may do more harm than good.如果我们干预的话，可能弊多利少。
• When others interfere in the affair,it always makes troubles. 别人一卷入这一事件，棘手的事情就来了。

70 interferes   

vi. 妨碍，冲突，干涉

参考例句：

• The noise interferes with my work. 这噪音妨碍我的工作。
• That interferes with my plan. 那干扰了我的计划。

71 penetrate   

v.透(渗)入；刺入，刺穿；洞察，了解

参考例句：

• Western ideas penetrate slowly through the East.西方观念逐渐传入东方。
• The sunshine could not penetrate where the trees were thickest.阳光不能透入树木最浓密的地方。

72 smite   

v.重击；彻底击败；n.打；尝试；一点儿

参考例句：

• The wise know how to teach,the fool how to smite.智者知道如何教导，愚者知道怎样破坏。
• God will smite our enemies.上帝将击溃我们的敌人。

73 minimal   

adj.尽可能少的，最小的

参考例句：

• They referred to this kind of art as minimal art.他们把这种艺术叫微型艺术。
• I stayed with friends, so my expenses were minimal.我住在朋友家，所以我的花费很小。

74 worthy   

adj.(of)值得的，配得上的；有价值的

参考例句：

• I did not esteem him to be worthy of trust.我认为他不值得信赖。
• There occurred nothing that was worthy to be mentioned.没有值得一提的事发生。

75 distinguished   

adj.卓越的，杰出的，著名的

参考例句：

• Elephants are distinguished from other animals by their long noses.大象以其长长的鼻子显示出与其他动物的不同。
• A banquet was given in honor of the distinguished guests.宴会是为了向贵宾们致敬而举行的。

76 isolated   

adj.与世隔绝的

参考例句：

• His bad behaviour was just an isolated incident. 他的不良行为只是个别事件。
• Patients with the disease should be isolated. 这种病的患者应予以隔离。

77 uncertainty   

n.易变，靠不住，不确知，不确定的事物

参考例句：

• Her comments will add to the uncertainty of the situation.她的批评将会使局势更加不稳定。
• After six weeks of uncertainty,the strain was beginning to take its toll.6个星期的忐忑不安后，压力开始产生影响了。

78 subjectively   

主观地； 臆

参考例句：

• Subjectively, the demand of interest is the desire of human being. 荀子所说的对利的需要从主观上说就是人的欲望。
• A sound also has an amplitude, a property subjectively heard as loudness. 声音有振幅，振幅的主观感觉是声音的大小。

79 stimuli   

n.刺激（物）

参考例句：

• It is necessary to curtail or alter normally coexisting stimuli.必需消除或改变正常时并存的刺激。
• My sweat glands also respond to emotional stimuli.我的汗腺对情绪刺激也能产生反应。

80 promptly   

adv.及时地，敏捷地

参考例句：

• He paid the money back promptly.他立即还了钱。
• She promptly seized the opportunity his absence gave her.她立即抓住了因他不在场给她创造的机会。

81 contraction   

n.缩略词，缩写式，害病

参考例句：

• The contraction of this muscle raises the lower arm.肌肉的收缩使前臂抬起。
• The forces of expansion are balanced by forces of contraction.扩张力和收缩力相互平衡。

82 components   

（机器、设备等的）构成要素，零件，成分； 成分( component的名词复数 )； [物理化学]组分； [数学]分量； （混合物的）组成部分

参考例句：

• the components of a machine 机器部件
• Our chemistry teacher often reduces a compound to its components in lab. 在实验室中化学老师常把化合物分解为各种成分。

83 recording   

n.录音，记录

参考例句：

• How long will the recording of the song take?录下这首歌得花多少时间？
• I want to play you a recording of the rehearsal.我想给你放一下彩排的录像。

84 anachronistic   

adj.时代错误的

参考例句：

• In remembering historic events,the mistake you tend to make is anachronistic.在记历史事件时，你容易犯的错误是时代错误。
• English public schools are anachronistic.英国的公立学校已经落伍过时了。

85 displacement   

n.移置，取代，位移，排水量

参考例句：

• They said that time is the feeling of spatial displacement.他们说时间是空间位移的感觉。
• The displacement of all my energy into caring for the baby.我所有精力都放在了照顾宝宝上。

86 intervals   

n.[军事]间隔( interval的名词复数 )；间隔时间；[数学]区间；（戏剧、电影或音乐会的）幕间休息

参考例句：

• The forecast said there would be sunny intervals and showers. 预报间晴，有阵雨。
• Meetings take place at fortnightly intervals. 每两周开一次会。

87 aberration   

n.离开正路，脱离常规，色差

参考例句：

• The removal of the chromatic aberration is then of primary importance.这时消除色差具有头等重要性。
• Owing to a strange mental aberration he forgot his own name.由于一种莫名的精神错乱，他把自己的名字忘了。

88 aberrations   

n.偏差( aberration的名词复数 )；差错；脱离常规；心理失常

参考例句：

• These events were aberrations from the norm. 这些事件不合常规。 来自辞典例句
• These chromosome aberrations are all stable, compatible with cell viability. 这些染色体畸变都是稳定的，不影响细胞生活力的。 来自辞典例句

89 sufficiently   

adv.足够地，充分地

参考例句：

• It turned out he had not insured the house sufficiently.原来他没有给房屋投足保险。
• The new policy was sufficiently elastic to accommodate both views.新政策充分灵活地适用两种观点。

90 velocity   

n.速度，速率

参考例句：

• Einstein's theory links energy with mass and velocity of light.爱因斯坦的理论把能量同质量和光速联系起来。
• The velocity of light is about 300000 kilometres per second.光速约为每秒300000公里。

91 varied   

adj.多样的，多变化的

参考例句：

• The forms of art are many and varied.艺术的形式是多种多样的。
• The hotel has a varied programme of nightly entertainment.宾馆有各种晚间娱乐活动。

92 apparently   

adv.显然地；表面上，似乎

参考例句：

• An apparently blind alley leads suddenly into an open space.山穷水尽，豁然开朗。
• He was apparently much surprised at the news.他对那个消息显然感到十分惊异。

93 deficient   

adj.不足的，不充份的，有缺陷的

参考例句：

• The crops are suffering from deficient rain.庄稼因雨量不足而遭受损害。
• I always have been deficient in selfconfidence and decision.我向来缺乏自信和果断。

94 deliberately   

adv.审慎地；蓄意地；故意地

参考例句：

• The girl gave the show away deliberately.女孩故意泄露秘密。
• They deliberately shifted off the argument.他们故意回避这个论点。

95 drawn   

v.拖，拉，拔出；adj.憔悴的，紧张的

参考例句：

• All the characters in the story are drawn from life.故事中的所有人物都取材于生活。
• Her gaze was drawn irresistibly to the scene outside.她的目光禁不住被外面的风景所吸引。

96 neutralize   

v.使失效、抵消，使中和

参考例句：

• Nothing could neutralize its good effects.没有什么能抵消它所产生的好影响。
• Acids neutralize alkalis and vice versa.酸能使碱中和碱，亦能使酸中和。

97 alterations   

n.改动( alteration的名词复数 )；更改；变化；改变

参考例句：

• Any alterations should be written in neatly to the left side. 改动部分应书写清晰，插在正文的左侧。 来自《简明英汉词典》
• Gene mutations are alterations in the DNA code. 基因突变是指DNA 密码的改变。 来自《简明英汉词典》

98 retardation   

n.智力迟钝，精神发育迟缓

参考例句：

• Asbestos reinforcement confers excellent flame retardation properties on a composite. 石棉增强材料使复合材料具有优异的防火性能。
• The theory confirms the increase in the retardation effect with decrease in particle size. 理论证实，随着颗粒尺寸的减小，这一减速效应将增大。

99 tactile   

adj.触觉的，有触觉的，能触知的

参考例句：

• Norris is an expert in the tactile and the tangible.诺里斯创作最精到之处便是，他描绘的人物使人看得见摸得着。
• Tactile communication uses touch rather than sight or hearing.触觉交流，是用触摸感觉，而不是用看或听来感觉。

100 increment   

n.增值，增价；提薪，增加工资

参考例句：

• Each increment of knowledge tells us more of our world.知识的点滴增长都会增进我们对世界的认知。
• She receives a salary increment each year.她每年得到加薪。

101 relatively   

adv.比较...地，相对地

参考例句：

• The rabbit is a relatively recent introduction in Australia.兔子是相对较新引入澳大利亚的物种。
• The operation was relatively painless.手术相对来说不痛。

102 maxim   

n.格言，箴言

参考例句：

• Please lay the maxim to your heart.请把此格言记在心里。
• "Waste not,want not" is her favourite maxim.“不浪费则不匮乏”是她喜爱的格言。

103 antedates   

v.（在历史上）比…为早( antedate的第三人称单数 )；先于；早于；（在信、支票等上）填写比实际日期早的日期

参考例句：

• This event antedates the discovery of America by several centuries. 这件事比发现美洲早几个世纪。 来自辞典例句
• This old carriage antedates the invention of the car. 这辆旧马车是在汽车发明前就存在的。 来自互联网

104 ripening   

v.成熟，使熟( ripen的现在分词 )；熟化；熟成

参考例句：

• The corn is blossoming [ripening]. 玉米正在开花[成熟]。 来自《现代汉英综合大词典》
• When the summer crop is ripening, the autumn crop has to be sowed. 夏季作物成熟时，就得播种秋季作物。 来自《简明英汉词典》

105 anticipation   

n.预期，预料，期望

参考例句：

• We waited at the station in anticipation of her arrival.我们在车站等着，期待她的到来。
• The animals grew restless as if in anticipation of an earthquake.各种动物都变得焦躁不安，像是感到了地震即将发生。

106 noted   

adj.著名的，知名的

参考例句：

• The local hotel is noted for its good table.当地的那家酒店以餐食精美而著称。
• Jim is noted for arriving late for work.吉姆上班迟到出了名。

107 immediate   

adj.立即的；直接的，最接近的；紧靠的

参考例句：

• His immediate neighbours felt it their duty to call.他的近邻认为他们有责任去拜访。
• We declared ourselves for the immediate convocation of the meeting.我们主张立即召开这个会议。

108 mediate   

vi.调解，斡旋；vt.经调解解决；经斡旋促成

参考例句：

• The state must mediate the struggle for water resources.政府必须通过调解来解决对水资源的争夺。
• They may be able to mediate between parties with different interests.他们也许能在不同利益政党之间进行斡旋。

109 derived   

vi.起源；由来；衍生；导出v.得到( derive的过去式和过去分词 )；（从…中）得到获得；源于；（从…中）提取

参考例句：

• Many English words are derived from Latin and Greek. 英语很多词源出于拉丁文和希腊文。 来自《简明英汉词典》
• He derived his enthusiasm for literature from his father. 他对文学的爱好是受他父亲的影响。 来自《简明英汉词典》

110 derive   

v.取得；导出；引申；来自；源自；出自

参考例句：

• We derive our sustenance from the land.我们从土地获取食物。
• We shall derive much benefit from reading good novels.我们将从优秀小说中获得很大好处。

111 instinctive   

adj.(出于)本能的；直觉的；(出于)天性的

参考例句：

• He tried to conceal his instinctive revulsion at the idea.他试图饰盖自己对这一想法本能的厌恶。
• Animals have an instinctive fear of fire.动物本能地怕火。

112 metallic   

adj.金属的；金属制的；含金属的；产金属的；像金属的

参考例句：

• A sharp metallic note coming from the outside frightened me.外面传来尖锐铿锵的声音吓了我一跳。
• He picked up a metallic ring last night.昨夜他捡了一个金属戒指。

113 mobility   

n.可动性，变动性，情感不定

参考例句：

• The difference in regional house prices acts as an obstacle to mobility of labour.不同地区房价的差异阻碍了劳动力的流动。
• Mobility is very important in guerrilla warfare.机动性在游击战中至关重要。

114 instinctively   

adv.本能地

参考例句：

• As he leaned towards her she instinctively recoiled. 他向她靠近，她本能地往后缩。 来自《简明英汉词典》
• He knew instinctively where he would find her. 他本能地知道在哪儿能找到她。 来自《简明英汉词典》

115 motives   

n.动机，目的( motive的名词复数 )

参考例句：

• to impeach sb's motives 怀疑某人的动机
• His motives are unclear. 他的用意不明。

116 discriminated   

分别，辨别，区分( discriminate的过去式和过去分词 )； 歧视，有差别地对待

参考例句：

• His great size discriminated him from his followers. 他的宽广身材使他不同于他的部下。
• Should be a person that has second liver virus discriminated against? 一个患有乙肝病毒的人是不是就应该被人歧视？

117 rumor   

n.谣言，谣传，传说

参考例句：

• The rumor has been traced back to a bad man.那谣言经追查是个坏人造的。
• The rumor has taken air.谣言流传开了。

118 unintelligible   

adj.无法了解的，难解的，莫明其妙的

参考例句：

• If a computer is given unintelligible data, it returns unintelligible results.如果计算机得到的是难以理解的数据，它给出的也将是难以理解的结果。
• The terms were unintelligible to ordinary folk.这些术语一般人是不懂的。

119 murmur   

n.低语，低声的怨言；v.低语，低声而言

参考例句：

• They paid the extra taxes without a murmur.他们毫无怨言地交了附加税。
• There was a low murmur of conversation in the hall.大厅里有窃窃私语声。

120 anecdote   

n.轶事，趣闻，短故事

参考例句：

• He departed from the text to tell an anecdote.他偏离课文讲起了一则轶事。
• It had never been more than a family anecdote.那不过是个家庭趣谈罢了。

121 vagrant   

n.流浪者，游民；adj.流浪的，漂泊不定的

参考例句：

• A vagrant is everywhere at home.流浪者四海为家。
• He lived on the street as a vagrant.他以在大街上乞讨为生。

122 attentive   

adj.注意的，专心的；关心(别人)的，殷勤的

参考例句：

• She was very attentive to her guests.她对客人招待得十分周到。
• The speaker likes to have an attentive audience.演讲者喜欢注意力集中的听众。

123 meditation   

n.熟虑，（尤指宗教的）默想，沉思，（pl.）冥想录

参考例句：

• This peaceful garden lends itself to meditation.这个恬静的花园适于冥想。
• I'm sorry to interrupt your meditation.很抱歉，我打断了你的沉思。

124 exclamation   

n.感叹号，惊呼，惊叹词

参考例句：

• He could not restrain an exclamation of approval.他禁不住喝一声采。
• The author used three exclamation marks at the end of the last sentence to wake up the readers.作者在文章的最后一句连用了三个惊叹号，以引起读者的注意。

125 engrossed   

adj.全神贯注的

参考例句：

• The student is engrossed in his book.这名学生正在专心致志地看书。
• No one had ever been quite so engrossed in an evening paper.没人会对一份晚报如此全神贯注。

126 massacre   

n.残杀，大屠杀；v.残杀，集体屠杀

参考例句：

• There was a terrible massacre of villagers here during the war.在战争中，这里的村民惨遭屠杀。
• If we forget the massacre,the massacre will happen again!忘记了大屠杀，大屠杀就有可能再次发生！

127 catastrophe   

n.大灾难，大祸

参考例句：

• I owe it to you that I survived the catastrophe.亏得你我才大难不死。
• This is a catastrophe beyond human control.这是一场人类无法控制的灾难。

128 habitually   

ad.习惯地，通常地

参考例句：

• The pain of the disease caused him habitually to furrow his brow. 病痛使他习惯性地紧皱眉头。
• Habitually obedient to John, I came up to his chair. 我已经习惯于服从约翰，我来到他的椅子跟前。

129 mathematicians   

数学家( mathematician的名词复数 )

参考例句：

• Do you suppose our mathematicians are unequal to that? 你以为我们的数学家做不到这一点吗？ 来自英汉文学
• Mathematicians can solve problems with two variables. 数学家们可以用两个变数来解决问题。 来自哲学部分

130 mathematician   

n.数学家

参考例句：

• The man with his back to the camera is a mathematician.背对着照相机的人是位数学家。
• The mathematician analyzed his figures again.这位数学家再次分析研究了他的这些数字。

131 gallows   

n.绞刑架，绞台

参考例句：

• The murderer was sent to the gallows for his crimes.谋杀犯由于罪大恶极被处以绞刑。
• Now I was to expiate all my offences at the gallows.现在我将在绞刑架上赎我一切的罪过。

132 philological   

adj.语言学的，文献学的

参考例句：

• Kanwa dictionary is a main kind of Japanese philological dictionary. 汉和辞典是日本语文词典的一个主要门类。 来自互联网
• Emotional education is the ultimate goal of philological teaching, while humanism the core of the former. 情感教育是语文教育的终极目标，而人文精神是情感教育的核心内容。 来自互联网

133 logic   

n.逻辑(学)；逻辑性

参考例句：

• What sort of logic is that?这是什么逻辑？
• I don't follow the logic of your argument.我不明白你的论点逻辑性何在。

134 speculations   

n.投机买卖( speculation的名词复数 )；思考；投机活动；推断

参考例句：

• Your speculations were all quite close to the truth. 你的揣测都很接近于事实。 来自《现代英汉综合大词典》
• This possibility gives rise to interesting speculations. 这种可能性引起了有趣的推测。 来自《用法词典》

135 awakened   

v.（使）醒( awaken的过去式和过去分词 )；（使）觉醒；弄醒；（使）意识到

参考例句：

• She awakened to the sound of birds singing. 她醒来听到鸟的叫声。
• The public has been awakened to the full horror of the situation. 公众完全意识到了这一状况的可怕程度。 来自《简明英汉词典》

136 tardy   

adj.缓慢的，迟缓的

参考例句：

• It's impolite to make a tardy appearance.晚到是不礼貌的。
• The boss is unsatisfied with the tardy tempo.老板不满于这种缓慢的进度。

137 banish   

vt.放逐，驱逐；消除，排除

参考例句：

• The doctor advised her to banish fear and anxiety.医生劝她消除恐惧和忧虑。
• He tried to banish gloom from his thought.他试图驱除心中的忧愁。

138 determined   

adj.坚定的；有决心的

参考例句：

• I have determined on going to Tibet after graduation.我已决定毕业后去西藏。
• He determined to view the rooms behind the office.他决定查看一下办公室后面的房间。

139 recurred   

再发生，复发( recur的过去式和过去分词 )； 治愈

参考例句：

• Old memories constantly recurred to him. 往事经常浮现在他的脑海里。
• She always winced when he recurred to the subject of his poems. 每逢他一提到他的诗作的时候，她总是有点畏缩。

140 recur   

vi.复发，重现，再发生

参考例句：

• Economic crises recur periodically.经济危机周期性地发生。
• Of course,many problems recur at various periods.当然，有许多问题会在不同的时期反复提出。

141 merged   

（使）混合( merge的过去式和过去分词 )； 相融； 融入； 渐渐消失在某物中

参考例句：

• Turf wars are inevitable when two departments are merged. 两个部门合并时总免不了争争权限。
• The small shops were merged into a large market. 那些小商店合并成为一个大商场。

142 potent   

adj.强有力的，有权势的；有效力的

参考例句：

• The medicine had a potent effect on your disease.这药物对你的病疗效很大。
• We must account of his potent influence.我们必须考虑他的强有力的影响。

143 vaguely   

adv.含糊地，暖昧地

参考例句：

• He had talked vaguely of going to work abroad.他含糊其词地说了到国外工作的事。
• He looked vaguely before him with unseeing eyes.他迷迷糊糊的望着前面，对一切都视而不见。

144 resolute   

adj.坚决的，果敢的

参考例句：

• He was resolute in carrying out his plan.他坚决地实行他的计划。
• The Egyptians offered resolute resistance to the aggressors.埃及人对侵略者作出坚决的反抗。

145 resolutely   

adj.坚决地，果断地

参考例句：

• He resolutely adhered to what he had said at the meeting. 他坚持他在会上所说的话。
• He grumbles at his lot instead of resolutely facing his difficulties. 他不是果敢地去面对困难，而是抱怨自己运气不佳。

146 discordant   

adj.不调和的

参考例句：

• Leonato thought they would make a discordant pair.里奥那托认为他们不适宜作夫妻。
• For when we are deeply mournful discordant above all others is the voice of mirth.因为当我们极度悲伤的时候，欢乐的声音会比其他一切声音都更显得不谐调。

147 insipid   

adj.无味的，枯燥乏味的，单调的

参考例句：

• The food was rather insipid and needed gingering up.这食物缺少味道，需要加点作料。
• She said she was a good cook,but the food she cooked is insipid.她说她是个好厨师，但她做的食物却是无味道的。

148 vice   

n.坏事；恶习；[pl.]台钳，老虎钳；adj.副的

参考例句：

• He guarded himself against vice.他避免染上坏习惯。
• They are sunk in the depth of vice.他们堕入了罪恶的深渊。

149 irrelevant   

adj.不恰当的，无关系的，不相干的

参考例句：

• That is completely irrelevant to the subject under discussion.这跟讨论的主题完全不相关。
• A question about arithmetic is irrelevant in a music lesson.在音乐课上，一个数学的问题是风马牛不相及的。

150 incessant   

adj.不停的，连续的

参考例句：

• We have had incessant snowfall since yesterday afternoon.从昨天下午开始就持续不断地下雪。
• She is tired of his incessant demands for affection.她厌倦了他对感情的不断索取。

151 incessantly   

ad.不停地

参考例句：

• The machines roar incessantly during the hours of daylight. 机器在白天隆隆地响个不停。
• It rained incessantly for the whole two weeks. 雨不间断地下了整整两个星期。

152 stimulating   

adj.有启发性的，能激发人思考的

参考例句：

• shower gel containing plant extracts that have a stimulating effect on the skin 含有对皮肤有益的植物精华的沐浴凝胶
• This is a drug for stimulating nerves. 这是一种兴奋剂。

153 shun   

vt.避开，回避，避免

参考例句：

• Materialists face truth,whereas idealists shun it.唯物主义者面向真理，唯心主义者则逃避真理。
• This extremist organization has shunned conventional politics.这个极端主义组织有意避开了传统政治。

154 ebbing   

（指潮水）退( ebb的现在分词 )； 落； 减少； 衰落

参考例句：

• The pain was ebbing. 疼痛逐渐减轻了。
• There are indications that his esoteric popularity may be ebbing. 有迹象表明，他神秘的声望可能正在下降。

155 negate   

vt.否定，否认；取消，使无效

参考例句：

• Our actions often negate our principles.我们的行为时常与我们所信奉的原则背道而弛。
• Mass advertising could negate the classical theory of supply and demand.大宗广告可以否定古典经济学的供求理论。

156 fleeting   

adj.短暂的，飞逝的

参考例句：

• The girls caught only a fleeting glimpse of the driver.女孩们只匆匆瞥了一眼司机。
• Knowing the life fleeting,she set herself to enjoy if as best as she could.她知道这种日子转瞬即逝，于是让自已尽情地享受。

157 memento   

n.纪念品，令人回忆的东西

参考例句：

• The photos will be a permanent memento of your wedding.这些照片会成为你婚礼的永久纪念。
• My friend gave me his picture as a memento before going away.我的朋友在离别前给我一张照片留作纪念品。

158 heyday   

n.全盛时期，青春期

参考例句：

• The 19th century was the heyday of steam railways.19世纪是蒸汽机车鼎盛的时代。
• She was a great singer in her heyday.她在自己的黄金时代是个了不起的歌唱家。

159 pretext   

n.借口，托词

参考例句：

• He used his headache as a pretext for not going to school.他借口头疼而不去上学。
• He didn't attend that meeting under the pretext of sickness.他以生病为借口，没参加那个会议。

160 odiousness   

n.可憎；讨厌；可恨

参考例句：

161 detests   

v.憎恶，嫌恶，痛恨( detest的第三人称单数 )

参考例句：

• My brother detests having to get up early. 我兄弟极讨厌早起，又不得不早起。 来自辞典例句
• The LORD detests differing weights, and dishonest scales do not please him. 两样的法码，为耶和华所憎恶。诡诈的天平，也为不善。 来自互联网

162 rivalry   

n.竞争，竞赛，对抗

参考例句：

• The quarrel originated in rivalry between the two families.这次争吵是两家不和引起的。
• He had a lot of rivalry with his brothers and sisters.他和兄弟姐妹间经常较劲。

163 annexed   

[法] 附加的，附属的

参考例句：

• Germany annexed Austria in 1938. 1938年德国吞并了奥地利。
• The outlying villages were formally annexed by the town last year. 那些偏远的村庄于去年正式被并入该镇。

164 remains   

n.剩余物，残留物；遗体，遗迹

参考例句：

• He ate the remains of food hungrily.他狼吞虎咽地吃剩余的食物。
• The remains of the meal were fed to the dog.残羹剩饭喂狗了。

165 equilibrium   

n.平衡，均衡，相称，均势，平静

参考例句：

• Change in the world around us disturbs our inner equilibrium.我们周围世界的变化扰乱了我们内心的平静。
• This is best expressed in the form of an equilibrium constant.这最好用平衡常数的形式来表示。

166 persistent   

adj.坚持不懈的，执意的；持续的

参考例句：

• Albert had a persistent headache that lasted for three days.艾伯特连续头痛了三天。
• She felt embarrassed by his persistent attentions.他不时地向她大献殷勤，使她很难为情。

167 attainable   

a.可达到的，可获得的

参考例句：

• They set the limits of performance attainable. 它们确定着可达到的运行限度。
• If objectives are to be meaningful to people, they must be clear, attainable, actionable, and verifiable. 如果目标对人们是具有意义的，则目标必须是清晰的，能达到的，可以行动的，以及可供检验的。

168 attain   

vt.达到，获得，完成

参考例句：

• I used the scientific method to attain this end. 我用科学的方法来达到这一目的。
• His painstaking to attain his goal in life is praiseworthy. 他为实现人生目标所下的苦功是值得称赞的。

169 steadily   

adv.稳定地；不变地；持续地

参考例句：

• The scope of man's use of natural resources will steadily grow.人类利用自然资源的广度将日益扩大。
• Our educational reform was steadily led onto the correct path.我们的教学改革慢慢上轨道了。

170 exhausted   

adj.极其疲惫的，精疲力尽的

参考例句：

• It was a long haul home and we arrived exhausted.搬运回家的这段路程特别长，到家时我们已筋疲力尽。
• Jenny was exhausted by the hustle of city life.珍妮被城市生活的忙乱弄得筋疲力尽。

171 formulated   

v.构想出( formulate的过去式和过去分词 )；规划；确切地阐述；用公式表示

参考例句：

• He claims that the writer never consciously formulated his own theoretical position. 他声称该作家从未有意识地阐明他自己的理论见解。 来自《简明英汉词典》
• This idea can be formulated in two different ways. 这个意思可以有两种说法。 来自《现代汉英综合大词典》

172 rivet   

n.铆钉；vt.铆接，铆牢；集中(目光或注意力)

参考例句：

• They were taught how to bore rivet holes in the sides of ships.有人教他们如何在船的舷侧钻铆孔。
• The rivet heads are in good condition and without abrasion.铆钉钉头状况良好，并无过度磨损。

173 riveted   

铆接( rivet的过去式和过去分词 )； 把…固定住； 吸引； 引起某人的注意

参考例句：

• I was absolutely riveted by her story. 我完全被她的故事吸引住了。
• My attention was riveted by a slight movement in the bushes. 我的注意力被灌木丛中的轻微晃动吸引住了。

174 monotonously   

adv.单调地，无变化地

参考例句：

• The lecturer phrased monotonously. 这位讲师用词单调。 来自《简明英汉词典》
• The maid, still in tears, sniffed monotonously. 侍女还在哭，发出单调的抽泣声。 来自辞典例句

175 recurring   

adj.往复的，再次发生的

参考例句：

• This kind of problem is recurring often. 这类问题经常发生。
• For our own country, it has been a time for recurring trial. 就我们国家而言，它经过了一个反复考验的时期。

176 sprout   

n.芽，萌芽；vt.使发芽，摘去芽；vi.长芽，抽条

参考例句：

• When do deer first sprout horns?鹿在多大的时候开始长出角？
• It takes about a week for the seeds to sprout.这些种子大约要一周后才会发芽。

177 stagnant   

adj.不流动的，停滞的，不景气的

参考例句：

• Due to low investment,industrial output has remained stagnant.由于投资少，工业生产一直停滞不前。
• Their national economy is stagnant.他们的国家经济停滞不前。

178 coruscate   

v.闪亮，闪光

参考例句：

• What kind of mood can let person mind coruscate?什么样心情可以让人精神焕发？
• The electric car is your best choice,bring your life coruscate.这辆电动车是您最好的选择，领您的生活焕发光彩。

179 infinitely   

adv.无限地，无穷地

参考例句：

• There is an infinitely bright future ahead of us.我们有无限光明的前途。
• The universe is infinitely large.宇宙是无限大的。

180 bestowed   

赠给，授予( bestow的过去式和过去分词 )

参考例句：

• It was a title bestowed upon him by the king. 那是国王赐给他的头衔。
• He considered himself unworthy of the honour they had bestowed on him. 他认为自己不配得到大家赋予他的荣誉。

181 bestow   

v.把…赠与，把…授予；花费

参考例句：

• He wished to bestow great honors upon the hero.他希望将那些伟大的荣誉授予这位英雄。
• What great inspiration wiII you bestow on me?你有什么伟大的灵感能馈赠给我？

182 concatenated   

v.把 （一系列事件、事情等）联系起来( concatenate的过去式和过去分词 )

参考例句：

• The brakeman concatenated two freight cars. 制动员把两节货车连结到一起。 来自辞典例句
• On (K, N) Threshold Communication Secret Key Sharing Systems Using Concatenated Code. 级连码(K,N)门限通信密钥分散保管系统。 来自互联网

183 virtues   

美德( virtue的名词复数 )； 德行； 优点； 长处

参考例句：

• Doctors often extol the virtues of eating less fat. 医生常常宣扬少吃脂肪的好处。
• She delivered a homily on the virtues of family life. 她进行了一场家庭生活美德方面的说教。

184 strictly   

adv.严厉地，严格地；严密地

参考例句：

• His doctor is dieting him strictly.他的医生严格规定他的饮食。
• The guests were seated strictly in order of precedence.客人严格按照地位高低就座。

185 dint   

n.由于，靠；凹坑

参考例句：

• He succeeded by dint of hard work.他靠苦干获得成功。
• He reached the top by dint of great effort.他费了很大的劲终于爬到了顶。

186 judgment   

n.审判；判断力，识别力，看法，意见

参考例句：

• The chairman flatters himself on his judgment of people.主席自认为他审视人比别人高明。
• He's a man of excellent judgment.他眼力过人。

187 excellence   

n.优秀，杰出，(pl.)优点，美德

参考例句：

• His art has reached a high degree of excellence.他的艺术已达到炉火纯青的地步。
• My performance is far below excellence.我的表演离优秀还差得远呢。

188 literally   

adv.照字面意义，逐字地；确实

参考例句：

• He translated the passage literally.他逐字逐句地翻译这段文字。
• Sometimes she would not sit down till she was literally faint.有时候，她不走到真正要昏厥了，决不肯坐下来。

189 intensity   

n.强烈，剧烈；强度；烈度

参考例句：

• I didn't realize the intensity of people's feelings on this issue.我没有意识到这一问题能引起群情激奋。
• The strike is growing in intensity.罢工日益加剧。

190 emphatic   

adj.强调的，着重的；无可置疑的，明显的

参考例句：

• Their reply was too emphatic for anyone to doubt them.他们的回答很坚决，不容有任何人怀疑。
• He was emphatic about the importance of being punctual.他强调严守时间的重要性。

191 accentuating   

v.重读( accentuate的现在分词 )；使突出；使恶化；加重音符号于

参考例句：

• Elegant interior design accentuating the unique feeling of space. 优雅的室内设计突显了独特的空间感。 来自互联网
• Accentuating the positive is an article of faith here. 强调积极面在这里已变成一种信仰。 来自互联网

192 intensification   

n.激烈化，增强明暗度；加厚

参考例句：

• The intensification of the immunological response represents the body's natural defense. 增强免疫反应代表身体的自然保卫。 来自辞典例句
• Agriculture in the developing nations is not irreversibly committed, to a particular pattern of intensification. 发展中国家的农业并没有完全为某种集约化形式所束缚。 来自辞典例句

193 analogous   

adj.相似的；类似的

参考例句：

• The two situations are roughly analogous.两种情況大致相似。
• The company is in a position closely analogous to that of its main rival.该公司与主要竞争对手的处境极为相似。

194 lighter   

n.打火机，点火器；驳船；v.用驳船运送；light的比较级

参考例句：

• The portrait was touched up so as to make it lighter.这张画经过润色，色调明朗了一些。
• The lighter works off the car battery.引燃器利用汽车蓄电池打火。

195 pendulum   

n.摆，钟摆

参考例句：

• The pendulum swung slowly to and fro.钟摆在慢慢地来回摆动。
• He accidentally found that the desk clock did not swing its pendulum.他无意中发现座钟不摇摆了。

196 intensities   

n.强烈( intensity的名词复数 )；（感情的）强烈程度；强度；烈度

参考例句：

• At very high intensities, nuclear radiations cause itching and tingling of the skin. 当核辐射强度很高时，它能使皮肤感到发痒和刺痛。 来自辞典例句
• They ask again and again in a variety of ways and intensities. 他们会以不同的方式和强度来不停地问，直到他得到自己想要的答案为止。 来自互联网

197 augments   

增加，提高，扩大( augment的名词复数 )

参考例句：

• He augments his income by teaching in the evening. 他通过晚上教书来增加收入。
• Neostigmine augments the motor activity of the small and large bowel. 新斯的明增强小肠和大肠的运动功能。

198 essentially   

adv.本质上，实质上，基本上

参考例句：

• Really great men are essentially modest.真正的伟人大都很谦虚。
• She is an essentially selfish person.她本质上是个自私自利的人。

199 analyze   

vt.分析，解析 (=analyse)

参考例句：

• We should analyze the cause and effect of this event.我们应该分析这场事变的因果。
• The teacher tried to analyze the cause of our failure.老师设法分析我们失败的原因。

200 attentively   

adv.聚精会神地；周到地；谛；凝神

参考例句：

• She listened attentively while I poured out my problems. 我倾吐心中的烦恼时，她一直在注意听。 来自《简明英汉词典》
• She listened attentively and set down every word he said. 她专心听着，把他说的话一字不漏地记下来。 来自《简明英汉词典》

201 recollect   

v.回忆，想起，记起，忆起，记得

参考例句：

• He tried to recollect things and drown himself in them.他极力回想过去的事情而沉浸于回忆之中。
• She could not recollect being there.她回想不起曾经到过那儿。

202 vestiges   

残余部分( vestige的名词复数 )； 遗迹； 痕迹； 毫不

参考例句：

• the last vestiges of the old colonial regime 旧殖民制度最后的残余
• These upright stones are the vestiges of some ancient religion. 这些竖立的石头是某种古代宗教的遗迹。

203 phenomena   

n.现象

参考例句：

• Ade couldn't relate the phenomena with any theory he knew.艾德无法用他所知道的任何理论来解释这种现象。
• The object of these experiments was to find the connection,if any,between the two phenomena.这些实验的目的就是探索这两种现象之间的联系，如果存在着任何联系的话。

204 thoroughly   

adv.完全地，彻底地，十足地

参考例句：

• The soil must be thoroughly turned over before planting.一定要先把土地深翻一遍再下种。
• The soldiers have been thoroughly instructed in the care of their weapons.士兵们都系统地接受过保护武器的训练。

205 investigator   

n.研究者，调查者，审查者

参考例句：

• He was a special investigator for the FBI.他是联邦调查局的特别调查员。
• The investigator was able to deduce the crime and find the criminal.调查者能够推出犯罪过程并锁定罪犯。

206 experimentation   

n.实验，试验，实验法

参考例句：

• Many people object to experimentation on animals.许多人反对用动物做实验。
• Study and analysis are likely to be far cheaper than experimentation.研究和分析的费用可能要比实验少得多。

207 notably   

adv.值得注意地，显著地，尤其地，特别地

参考例句：

• Many students were absent,notably the monitor.许多学生缺席，特别是连班长也没来。
• A notably short,silver-haired man,he plays basketball with his staff several times a week.他个子明显较为矮小，一头银发，每周都会和他的员工一起打几次篮球。

208 apparatus   

n.装置，器械；器具，设备

参考例句：

• The school's audio apparatus includes films and records.学校的视听设备包括放映机和录音机。
• They had a very refined apparatus.他们有一套非常精良的设备。

209 liberating   

解放，释放( liberate的现在分词 )

参考例句：

• Revolution means liberating the productive forces. 革命就是为了解放生产力。
• They had already taken on their shoulders the burden of reforming society and liberating mankind. 甚至在这些集会聚谈中，他们就已经夸大地把改革社会、解放人群的责任放在自己的肩头了。 来自汉英文学 - 家（1-26） - 家（1-26）

210 climax   

n.顶点；高潮；v.(使)达到顶点

参考例句：

• The fifth scene was the climax of the play.第五场是全剧的高潮。
• His quarrel with his father brought matters to a climax.他与他父亲的争吵使得事态发展到了顶点。

211 foretells   

v.预言，预示( foretell的第三人称单数 )

参考例句：

• It is a kind of oracle that often foretells things most important. 它是一种内生性神谕，常常能预言最重要的事情。 来自互联网
• What the Old Testament foretells the New Testament fulfils, in part. 旧约圣经的预言在新约圣经中部分实现了。 来自互联网

212 physiological   

adj.生理学的，生理学上的

参考例句：

• He bought a physiological book.他买了一本生理学方面的书。
• Every individual has a physiological requirement for each nutrient.每个人对每种营养成分都有一种生理上的需要。

213 downwards   

adj./adv.向下的（地），下行的（地）

参考例句：

• He lay face downwards on his bed.他脸向下伏在床上。
• As the river flows downwards,it widens.这条河愈到下游愈宽。

214 remarkable   

adj.显著的，异常的，非凡的，值得注意的

参考例句：

• She has made remarkable headway in her writing skills.她在写作技巧方面有了长足进步。
• These cars are remarkable for the quietness of their engines.这些汽车因发动机没有噪音而不同凡响。

215 prematurely   

adv.过早地，贸然地

参考例句：

• She was born prematurely with poorly developed lungs. 她早产，肺部未发育健全。 来自《简明英汉词典》
• His hair was prematurely white, but his busy eyebrows were still jet-black. 他的头发已经白了，不过两道浓眉还是乌黑乌黑的。 来自辞典例句

216 retarded   

a.智力迟钝的，智力发育迟缓的

参考例句：

• The progression of the disease can be retarded by early surgery. 早期手术可以抑制病情的发展。
• He was so slow that many thought him mentally retarded. 他迟钝得很，许多人以为他智力低下。

217 tracts   

大片土地( tract的名词复数 )； 地带； （体内的）道； （尤指宣扬宗教、伦理或政治的）短文

参考例句：

• vast tracts of forest 大片大片的森林
• There are tracts of desert in Australia. 澳大利亚有大片沙漠。

218 volition   

n.意志；决意

参考例句：

• We like to think that everything we do and everything we think is a product of our volition.我们常常认为我们所做和所想的一切都出自自己的意愿。
• Makin said Mr Coombes had gone to the police of his own volition.梅金说库姆斯先生是主动去投案的。

219 conspicuously   

ad.明显地，惹人注目地

参考例句：

• France remained a conspicuously uneasy country. 法国依然是个明显不太平的国家。
• She figured conspicuously in the public debate on the issue. 她在该问题的公开辩论中很引人注目。

220 previously   

adv.以前，先前（地）

参考例句：

• The bicycle tyre blew out at a previously damaged point.自行车胎在以前损坏过的地方又爆开了。
• Let me digress for a moment and explain what had happened previously.让我岔开一会儿，解释原先发生了什么。

221 lengthened   

（时间或空间）延长，伸长( lengthen的过去式和过去分词 )

参考例句：

• The afternoon shadows lengthened. 下午影子渐渐变长了。
• He wanted to have his coat lengthened a bit. 他要把上衣放长一些。

222 momentary   

adj.片刻的，瞬息的；短暂的

参考例句：

• We are in momentary expectation of the arrival of you.我们无时无刻不在盼望你的到来。
• I caught a momentary glimpse of them.我瞥了他们一眼。

223 stimulation   

n.刺激，激励，鼓舞

参考例句：

• The playgroup provides plenty of stimulation for the children.幼儿游戏组给孩子很多启发。
• You don't get any intellectual stimulation in this job.你不能从这份工作中获得任何智力启发。

224 considerably   

adv.极大地；相当大地；在很大程度上

参考例句：

• The economic situation has changed considerably.经济形势已发生了相当大的变化。
• The gap has narrowed considerably.分歧大大缩小了。

225 disturbance   

n.动乱，骚动；打扰，干扰；(身心)失调

参考例句：

• He is suffering an emotional disturbance.他的情绪受到了困扰。
• You can work in here without any disturbance.在这儿你可不受任何干扰地工作。

226 platinum   

n.白金

参考例句：

• I'll give her a platinum ring.我打算送给她一枚白金戒指。
• Platinum exceeds gold in value.白金的价值高于黄金。

227 depressed   

adj.沮丧的，抑郁的，不景气的，萧条的

参考例句：

• When he was depressed,he felt utterly divorced from reality.他心情沮丧时就感到完全脱离了现实。
• His mother was depressed by the sad news.这个坏消息使他的母亲意志消沉。

228 retarding   

使减速( retard的现在分词 )； 妨碍； 阻止； 推迟

参考例句：

• There may be a need for retarding growth chemically to keep trees within bounds. 可能需要用化学剂抑制生长，使树冠保持在一定的范围内。
• In some instances, an aversion to debt is retarding growth. 在某些情况下，对债务的反感正阻碍经济增长。

229 coerced   

v.迫使做( coerce的过去式和过去分词 )；强迫；（以武力、惩罚、威胁等手段）控制；支配

参考例句：

• They were coerced into negotiating a settlement. 他们被迫通过谈判解决。
• He was coerced into making a confession. 他被迫招供。 来自《简明英汉词典》

230 corporeal   

adj.肉体的，身体的；物质的

参考例句：

• The body is the corporeal habitation of the soul.身体为灵魂之有形寓所。
• He is very religious;corporeal world has little interest for him.他虔信宗教，对物质上的享受不感兴趣。

231 diffused   

散布的，普及的，扩散的

参考例句：

• A drop of milk diffused in the water. 一滴牛奶在水中扩散开来。
• Gases and liquids diffused. 气体和液体慢慢混合了。

232 thereby   

adv.因此，从而

参考例句：

• I have never been to that city,,ereby I don't know much about it.我从未去过那座城市，因此对它不怎么熟悉。
• He became a British citizen,thereby gaining the right to vote.他成了英国公民，因而得到了投票权。

233 substantive   

adj.表示实在的；本质的、实质性的；独立的；n.实词，实名词；独立存在的实体

参考例句：

• They plan to meet again in Rome very soon to begin substantive negotiations.他们计划不久在罗马再次会晤以开始实质性的谈判。
• A president needs substantive advice,but he also requires emotional succor. 一个总统需要实质性的建议，但也需要感情上的支持。

234 substantives   

n.作名词用的词或词组（substantive的复数形式）

参考例句：

235 utterance   

n.用言语表达，话语，言语

参考例句：

• This utterance of his was greeted with bursts of uproarious laughter.他的讲话引起阵阵哄然大笑。
• My voice cleaves to my throat,and sob chokes my utterance.我的噪子哽咽，泣不成声。

236 edible   

n.食品，食物；adj.可食用的

参考例句：

• Edible wild herbs kept us from dying of starvation.我们靠着野菜才没被饿死。
• This kind of mushroom is edible,but that kind is not.这种蘑菇吃得，那种吃不得。

237 averted   

防止，避免( avert的过去式和过去分词 )； 转移

参考例句：

• A disaster was narrowly averted. 及时防止了一场灾难。
• Thanks to her skilful handling of the affair, the problem was averted. 多亏她对事情处理得巧妙，才避免了麻烦。

238 recondite   

adj.深奥的，难解的

参考例句：

• Her poems are modishly experimental in style and recondite in subject-matter.她的诗在风格上是时髦的实验派，主题艰深难懂。
• To a craftsman,the ancient article with recondite and scholastic words was too abstruse to understand.可是对一个车轮师父而言，这些之乎者也的文言文是太深而难懂的。

239 sensory   

adj.知觉的，感觉的，知觉器官的

参考例句：

• Human powers of sensory discrimination are limited.人类感官分辨能力有限。
• The sensory system may undergo long-term adaptation in alien environments.感觉系统对陌生的环境可能经过长时期才能适应。

240 anticipatory   

adj.预想的，预期的

参考例句：

• An anticipatory story is a trap to the teller.对于讲故事的人而言，事先想好的故事是个框框。
• Data quality is a function of systematic usage,not anticipatory design.数据质量是系统使用的功能，不是可预料的设计。

241 respiration   

n.呼吸作用；一次呼吸；植物光合作用

参考例句：

• They tried artificial respiration but it was of no avail.他们试做人工呼吸，可是无效。
• They made frequent checks on his respiration,pulse and blood.他们经常检查他的呼吸、脉搏和血液。

242 contractions   

n.收缩( contraction的名词复数 )；缩减；缩略词；（分娩时）子宫收缩

参考例句：

• Contractions are much more common in speech than in writing. 缩略词在口语里比在书写中常见得多。 来自《简明英汉词典》
• Muscle contractions are powered by the chemical adenosine triphosphate(ATP ). 肌肉收缩是由化学物质三磷酸腺苷(ATP)提供动力的。 来自辞典例句

243 decided   

adj.决定了的，坚决的；明显的，明确的

参考例句：

• This gave them a decided advantage over their opponents.这使他们比对手具有明显的优势。
• There is a decided difference between British and Chinese way of greeting.英国人和中国人打招呼的方式有很明显的区别。

244 vividly   

adv.清楚地，鲜明地，生动地

参考例句：

• The speaker pictured the suffering of the poor vividly.演讲者很生动地描述了穷人的生活。
• The characters in the book are vividly presented.这本书里的人物写得栩栩如生。

245 retract   

vt.缩回，撤回收回，取消

参考例句：

• The criminals should stop on the precipice, retract from the wrong path and not go any further.犯罪分子应当迷途知返，悬崖勒马，不要在错误的道路上继续走下去。
• I don't want to speak rashly now and later have to retract my statements.我不想现在说些轻率的话，然后又要收回自己说过的话。

246 backwards   

adv.往回地，向原处，倒，相反，前后倒置地

参考例句：

• He turned on the light and began to pace backwards and forwards.他打开电灯并开始走来走去。
• All the girls fell over backwards to get the party ready.姑娘们迫不及待地为聚会做准备。

247 retraction   

n.撤消；收回

参考例句：

• He demanded a full retraction of the allegations against him.他要求完全收回针对他的言论。
• The newspaper published a retraction of the erroneous report.那家报纸声明撤回那篇错误的报道。

248 outwards   

adj.外面的，公开的，向外的；adv.向外；n.外形

参考例句：

• Does this door open inwards or outwards?这门朝里开还是朝外开？
• In lapping up a fur,they always put the inner side outwards.卷毛皮时，他们总是让内层朝外。

249 upwards   

adv.向上，在更高处...以上

参考例句：

• The trend of prices is still upwards.物价的趋向是仍在上涨。
• The smoke rose straight upwards.烟一直向上升。

250 periphery   

n.(圆体的)外面；周围

参考例句：

• Geographically, the UK is on the periphery of Europe.从地理位置上讲，英国处于欧洲边缘。
• The periphery of the retina is very sensitive to motion.视网膜的外围对运动非常敏感。

251 peripheral   

adj.周边的，外围的

参考例句：

• We dealt with the peripheral aspects of a cost reduction program.我们谈到了降低成本计划的一些外围问题。
• The hotel provides the clerk the service and the peripheral traveling consultation.旅舍提供票务服务和周边旅游咨询。

252 catching   

adj.易传染的，有魅力的，迷人的，接住

参考例句：

• There are those who think eczema is catching.有人就是认为湿疹会传染。
• Enthusiasm is very catching.热情非常富有感染力。

253 rotation   

n.旋转；循环，轮流

参考例句：

• Crop rotation helps prevent soil erosion.农作物轮作有助于防止水土流失。
• The workers in this workshop do day and night shifts in weekly rotation.这个车间的工人上白班和上夜班每周轮换一次。

254 illuminate   

vt.照亮，照明；用灯光装饰；说明，阐释

参考例句：

• Dreams kindle a flame to illuminate our dark roads.梦想点燃火炬照亮我们黑暗的道路。
• They use games and drawings to illuminate their subject.他们用游戏和图画来阐明他们的主题。

255 illuminated   

adj.被照明的；受启迪的

参考例句：

• Floodlights illuminated the stadium. 泛光灯照亮了体育场。
• the illuminated city at night 夜幕中万家灯火的城市

256 pricked   

刺，扎，戳( prick的过去式和过去分词 )； 刺伤； 刺痛； 使剧痛

参考例句：

• The cook pricked a few holes in the pastry. 厨师在馅饼上戳了几个洞。
• He was pricked by his conscience. 他受到良心的谴责。

257 remarkably   

ad.不同寻常地，相当地

参考例句：

• I thought she was remarkably restrained in the circumstances. 我认为她在那种情况下非常克制。
• He made a remarkably swift recovery. 他康复得相当快。

258 physically   

adj.物质上，体格上，身体上，按自然规律

参考例句：

• He was out of sorts physically,as well as disordered mentally.他浑身不舒服，心绪也很乱。
• Every time I think about it I feel physically sick.一想起那件事我就感到极恶心。

259 unwilling   

adj.不情愿的

参考例句：

• The natives were unwilling to be bent by colonial power.土著居民不愿受殖民势力的摆布。
• His tightfisted employer was unwilling to give him a raise.他那吝啬的雇主不肯给他加薪。

260 feat   

n.功绩；武艺，技艺；adj.灵巧的，漂亮的，合适的

参考例句：

• Man's first landing on the moon was a feat of great daring.人类首次登月是一个勇敢的壮举。
• He received a medal for his heroic feat.他因其英雄业绩而获得一枚勋章。

261 portrayed   

v.画像( portray的过去式和过去分词 )；描述；描绘；描画

参考例句：

• Throughout the trial, he portrayed himself as the victim. 在审讯过程中，他始终把自己说成是受害者。
• The author portrayed his father as a vicious drunkard. 作者把他父亲描绘成一个可恶的酒鬼。 来自《现代汉英综合大词典》

262 foretold   

v.预言，预示( foretell的过去式和过去分词 )

参考例句：

• She foretold that the man would die soon. 她预言那人快要死了。 来自《简明英汉词典》
• Must lose one joy, by his life's star foretold. 这样注定：他，为了信守一个盟誓／就非得拿牺牲一个喜悦作代价。 来自英汉 - 翻译样例 - 文学

263 mimic   

v.模仿，戏弄；n.模仿他人言行的人

参考例句：

• A parrot can mimic a person's voice.鹦鹉能学人的声音。
• He used to mimic speech peculiarities of another.他过去总是模仿别人讲话的特点。

264 analyzed   

v.分析( analyze的过去式和过去分词 )；分解；解释；对…进行心理分析

参考例句：

• The doctors analyzed the blood sample for anemia. 医生们分析了贫血的血样。 来自《简明英汉词典》
• The young man did not analyze the process of his captivation and enrapturement, for love to him was a mystery and could not be analyzed. 这年轻人没有分析自己蛊惑著迷的过程，因为对他来说，爱是个不可分析的迷。 来自《简明英汉词典》

265 vibrations   

n.摆动( vibration的名词复数 )；震动；感受；（偏离平衡位置的）一次性往复振动

参考例句：

• We could feel the vibrations from the trucks passing outside. 我们可以感到外面卡车经过时的颤动。
• I am drawn to that girl; I get good vibrations from her. 我被那女孩吸引住了，她使我产生良好的感觉。 来自《简明英汉词典》

266 fugitive   

adj.逃亡的，易逝的；n.逃犯，逃亡者

参考例句：

• The police were able to deduce where the fugitive was hiding.警方成功地推断出那逃亡者躲藏的地方。
• The fugitive is believed to be headed for the border.逃犯被认为在向国境线逃窜。

267 awakens   

v.（使）醒( awaken的第三人称单数 )；（使）觉醒；弄醒；（使）意识到

参考例句：

• The scene awakens reminiscences of my youth. 这景象唤起我年轻时的往事。 来自《现代英汉综合大词典》
• The child awakens early in the morning. 这个小孩早晨醒得早。 来自辞典例句

268 attentiveness   

[医]注意

参考例句：

• They all helped one another with humourous attentiveness. 他们带着近于滑稽的殷勤互相周旋。 来自辞典例句
• Is not attentiveness the nature of, even the function of, Conscious? 专注不正是大我意识的本质甚或活动吗？ 来自互联网

269 symbolic   

adj.象征性的，符号的，象征主义的

参考例句：

• It is symbolic of the fighting spirit of modern womanhood.它象征着现代妇女的战斗精神。
• The Christian ceremony of baptism is a symbolic act.基督教的洗礼仪式是一种象征性的做法。

270 glide   

n./v.溜，滑行；(时间)消逝

参考例句：

• We stood in silence watching the snake glide effortlessly.我们噤若寒蝉地站着，眼看那条蛇逍遥自在地游来游去。
• So graceful was the ballerina that she just seemed to glide.那芭蕾舞女演员翩跹起舞，宛如滑翔。

271 entity   

n.实体，独立存在体，实际存在物

参考例句：

• The country is no longer one political entity.这个国家不再是一个统一的政治实体了。
• As a separate legal entity,the corporation must pay taxes.作为一个独立的法律实体，公司必须纳税。

272 dreaded   

adj.令人畏惧的；害怕的v.害怕，恐惧，担心( dread的过去式和过去分词)

参考例句：

• The dreaded moment had finally arrived. 可怕的时刻终于来到了。
• He dreaded having to spend Christmas in hospital. 他害怕非得在医院过圣诞节不可。 来自《用法词典》

273 idol   

n.偶像，红人，宠儿

参考例句：

• As an only child he was the idol of his parents.作为独子，他是父母的宠儿。
• Blind worship of this idol must be ended.对这个偶像的盲目崇拜应该结束了。

274 pointed   

adj.尖的，直截了当的

参考例句：

• He gave me a very sharp pointed pencil.他给我一支削得非常尖的铅笔。
• She wished to show Mrs.John Dashwood by this pointed invitation to her brother.她想通过对达茨伍德夫人提出直截了当的邀请向她的哥哥表示出来。

275 dilate   

vt.使膨胀，使扩大

参考例句：

• At night,the pupils dilate to allow in more light.到了晚上，瞳孔就会扩大以接收更多光线。
• Exercise dilates blood vessels on the surface of the brain.运动会使大脑表层的血管扩张。

276 nostrils   

鼻孔( nostril的名词复数 )

参考例句：

• Her nostrils flared with anger. 她气得两个鼻孔都鼓了起来。
• The horse dilated its nostrils. 马张大鼻孔。

277 touching   

adj.动人的，使人感伤的

参考例句：

• It was a touching sight.这是一幅动人的景象。
• His letter was touching.他的信很感人。

278 speculative   

adj.思索性的，暝想性的，推理的

参考例句：

• Much of our information is speculative.我们的许多信息是带推测性的。
• The report is highly speculative and should be ignored.那个报道推测的成分很大，不应理会。

279 incapable   

adj.无能力的，不能做某事的

参考例句：

• He would be incapable of committing such a cruel deed.他不会做出这么残忍的事。
• Computers are incapable of creative thought.计算机不会创造性地思维。

280 colloquies   

n.谈话，对话( colloquy的名词复数 )

参考例句：

• In such colloquies the mother and the child passed a great deal of their time together. 娘儿两个这样谈体己话，一谈就是好些时候。 来自辞典例句

281 ardor   

n.热情，狂热

参考例句：

• His political ardor led him into many arguments.他的政治狂热使他多次卷入争论中。
• He took up his pursuit with ardor.他满腔热忱地从事工作。

282 grafted   

移植( graft的过去式和过去分词 )； 嫁接； 使（思想、制度等）成为（…的一部份）； 植根

参考例句：

• No art can be grafted with success on another art. 没有哪种艺术能成功地嫁接到另一种艺术上。
• Apples are easily grafted. 苹果树很容易嫁接。

283 prone   

adj.(to)易于…的，很可能…的；俯卧的

参考例句：

• Some people are prone to jump to hasty conclusions.有些人往往作出轻率的结论。
• He is prone to lose his temper when people disagree with him.人家一不同意他的意见,他就发脾气。

284 discourse   

n.论文，演说；谈话；话语；vi.讲述，著述

参考例句：

• We'll discourse on the subject tonight.我们今晚要谈论这个问题。
• He fell into discourse with the customers who were drinking at the counter.他和站在柜台旁的酒客谈了起来。

285 psychology   

n.心理，心理学，心理状态

参考例句：

• She has a background in child psychology.她受过儿童心理学的教育。
• He studied philosophy and psychology at Cambridge.他在剑桥大学学习哲学和心理学。

286 symbolized   

v.象征，作为…的象征( symbolize的过去式和过去分词 )

参考例句：

• For Tigress, Joy symbolized the best a woman could expect from life. 在她看，小福子就足代表女人所应有的享受。 来自汉英文学 - 骆驼祥子
• A car symbolized distinction and achievement, and he was proud. 汽车象征着荣誉和成功，所以他很自豪。 来自辞典例句

287 nucleus   

n.核，核心，原子核

参考例句：

• These young people formed the nucleus of the club.这些年轻人成了俱乐部的核心。
• These councils would form the nucleus of a future regime.这些委员会将成为一个未来政权的核心。

288 materialism   

n.［哲］唯物主义，唯物论；物质至上

参考例句：

• Idealism is opposite to materialism.唯心论和唯物论是对立的。
• Crass materialism causes people to forget spiritual values.极端唯物主义使人忘掉精神价值。

289 inert   

adj.无活动能力的，惰性的；迟钝的

参考例句：

• Inert gas studies are providing valuable information about other planets,too.对惰性气体的研究，也提供了有关其它行星的有价值的资料。
• Elemental nitrogen is a very unreactive and inert material.元素氮是一个十分不活跃的惰性物质。

290 purely   

adv.纯粹地，完全地

参考例句：

• I helped him purely and simply out of friendship.我帮他纯粹是出于友情。
• This disproves the theory that children are purely imitative.这证明认为儿童只会单纯地模仿的理论是站不住脚的。

291 ascertaining   

v.弄清，确定，查明( ascertain的现在分词 )

参考例句：

• I was ascertaining whether the cellar stretched out in front or behind. 我当时是要弄清楚地下室是朝前还是朝后延伸的。 来自辞典例句
• The design and ascertaining of permanent-magnet-biased magnetic bearing parameter are detailed introduced. 并对永磁偏置磁悬浮轴承参数的设计和确定进行了详细介绍。 来自互联网

292 presumptions   

n.假定( presumption的名词复数 )；认定；推定；放肆

参考例句：

• Much modern technological advance is based on these presumptions of legal security. 许多现代技术的发展都是基于这些法律安全设想的考虑。 来自互联网
• What visions, what expectations and what presumptions can outsoar that flight? 那一种想象，那一种期望和推测能超越他之上呢？ 来自互联网

293 tempted   

v.怂恿（某人）干不正当的事；冒…的险（tempt的过去分词）

参考例句：

• I was sorely tempted to complain, but I didn't. 我极想发牢骚，但还是没开口。
• I was tempted by the dessert menu. 甜食菜单馋得我垂涎欲滴。

294 plausibly   

似真地

参考例句：

• The case was presented very plausibly. 案情的申述似很可信。
• He argued very plausibly for its acceptance. 他为使之认可辩解得头头是道。

295 irritability   

n.易怒

参考例句：

• It was the almost furtive restlessness and irritability that had possessed him. 那是一种一直纠缠着他的隐秘的不安和烦恼。
• All organisms have irritability while alive. 所有生物体活着时都有应激性。

296 inflicted   

把…强加给，使承受，遭受( inflict的过去式和过去分词 )

参考例句：

• They inflicted a humiliating defeat on the home team. 他们使主队吃了一场很没面子的败仗。
• Zoya heroically bore the torture that the Fascists inflicted upon her. 卓娅英勇地承受法西斯匪徒加在她身上的酷刑。

297 acquiescence   

n.默许；顺从

参考例句：

• The chief inclined his head in sign of acquiescence.首领点点头表示允许。
• This is due to his acquiescence.这是因为他的默许。

298 adoption   

n.采用，采纳，通过；收养

参考例句：

• An adoption agency had sent the boys to two different families.一个收养机构把他们送给两个不同的家庭。
• The adoption of this policy would relieve them of a tremendous burden.采取这一政策会给他们解除一个巨大的负担。

299 pricking   

刺，刺痕，刺痛感

参考例句：

• She felt a pricking on her scalp. 她感到头皮上被扎了一下。
• Intercostal neuralgia causes paroxysmal burning pain or pricking pain. 肋间神经痛呈阵发性的灼痛或刺痛。

300 renewal   

adj.(契约)延期，续订，更新，复活，重来

参考例句：

• Her contract is coming up for renewal in the autumn.她的合同秋天就应该续签了。
• Easter eggs symbolize the renewal of life.复活蛋象征新生。

301 salvation   

n.（尤指基督）救世，超度，拯救，解困

参考例句：

• Salvation lay in political reform.解救办法在于政治改革。
• Christians hope and pray for salvation.基督教徒希望并祈祷灵魂得救。

302 expenditure   

n.(时间、劳力、金钱等)支出；使用，消耗

参考例句：

• The entry of all expenditure is necessary.有必要把一切开支入账。
• The monthly expenditure of our family is four hundred dollars altogether.我们一家的开销每月共计四百元。

303 flares   

n.喇叭裤v.（使）闪耀( flare的第三人称单数 )；（使）（船舷）外倾；（使）鼻孔张大；（使）（衣裙、酒杯等）呈喇叭形展开

参考例句：

• The side of a ship flares from the keel to the deck. 船舷从龙骨向甲板外倾。 来自《简明英汉词典》
• He's got a fiery temper and flares up at the slightest provocation. 他是火爆性子，一点就着。 来自《现代汉英综合大词典》

304 neutralization   

n.中立化，中立状态，中和

参考例句：

• Neutralization is the interaction of a base and an acid. 中和作用是碱和酸的相互作用。 来自辞典例句
• The neutralization equivalent of the polymer is 750(theoretical-681). 聚和物的中和当量为750（理论上为681）。 来自辞典例句

305 obstruction   

n.阻塞，堵塞；障碍物

参考例句：

• She was charged with obstruction of a police officer in the execution of his duty.她被指控妨碍警察执行任务。
• The road was cleared from obstruction.那条路已被清除了障碍。

306 eddy   

n.漩涡，涡流

参考例句：

• The motor car disappeared in eddy of dust.汽车在一片扬尘的涡流中不见了。
• In Taylor's picture,the eddy is the basic element of turbulence.在泰勒的描述里，旋涡是湍流的基本要素。

307 eddies   

（水、烟等的）漩涡，涡流( eddy的名词复数 )

参考例句：

• Viscosity overwhelms the smallest eddies and converts their energy into heat. 粘性制服了最小的旋涡而将其能量转换为热。
• But their work appears to merge in the study of large eddies. 但在大旋涡的研究上，他们的工作看来却殊途同归。

308 abject   

adj.极可怜的，卑屈的

参考例句：

• This policy has turned out to be an abject failure.这一政策最后以惨败而告终。
• He had been obliged to offer an abject apology to Mr.Alleyne for his impertinence.他不得不低声下气，为他的无礼举动向艾莱恩先生请罪。

309 superstition   

n.迷信，迷信行为

参考例句：

• It's a common superstition that black cats are unlucky.认为黑猫不吉祥是一种很普遍的迷信。
• Superstition results from ignorance.迷信产生于无知。

310 phantom   

n.幻影，虚位，幽灵；adj.错觉的，幻影的，幽灵的

参考例句：

• I found myself staring at her as if she were a phantom.我发现自己瞪大眼睛看着她，好像她是一个幽灵。
• He is only a phantom of a king.他只是有名无实的国王。

311 persuasively   

adv.口才好地；令人信服地

参考例句：

• Students find that all historians argue reasonably and persuasively. 学生们发现所有的历史学家都争论得有条有理，并且很有说服力。 来自辞典例句
• He spoke a very persuasively but I smelled a rat and refused his offer. 他说得头头是道，但我觉得有些可疑，于是拒绝了他的建议。 来自辞典例句

312 psychic   

n.对超自然力敏感的人；adj.有超自然力的

参考例句：

• Some people are said to have psychic powers.据说有些人有通灵的能力。
• She claims to be psychic and to be able to foretell the future.她自称有特异功能，能预知未来。

313 parsimonious   

adj.吝啬的，质量低劣的

参考例句：

• Many scrollbars are quite parsimonious in doling out information to users.很多滚动条都很吝啬，给用户传递的信息太少。
• His parsimonious nature did not permit him to enjoy any luxuries.他那吝啬的本性不容许他享受任何奢侈品。

314 justify   

vt.证明…正当(或有理)，为…辩护

参考例句：

• He tried to justify his absence with lame excuses.他想用站不住脚的借口为自己的缺席辩解。
• Can you justify your rude behavior to me?你能向我证明你的粗野行为是有道理的吗？

315 doom   

n.厄运，劫数；v.注定，命定

参考例句：

• The report on our economic situation is full of doom and gloom.这份关于我们经济状况的报告充满了令人绝望和沮丧的调子。
• The dictator met his doom after ten years of rule.独裁者统治了十年终于完蛋了。

316 rattling   

adj. 格格作响的, 活泼的, 很好的 adv. 极其, 很, 非常 动词rattle的现在分词

参考例句：

• This book is a rattling good read. 这是一本非常好的读物。
• At that same instant,a deafening explosion set the windows rattling. 正在这时，一声震耳欲聋的爆炸突然袭来，把窗玻璃震得当当地响。

317 tingle   

vi.感到刺痛，感到激动；n.刺痛，激动

参考例句：

• The music made my blood tingle.那音乐使我热血沸腾。
• The cold caused a tingle in my fingers.严寒使我的手指有刺痛感。

318 tragic   

adj.悲剧的，悲剧性的，悲惨的

参考例句：

• The effect of the pollution on the beaches is absolutely tragic.污染海滩后果可悲。
• Charles was a man doomed to tragic issues.查理是个注定不得善终的人。

319 zest   

n.乐趣；滋味，风味；兴趣

参考例句：

• He dived into his new job with great zest.他充满热情地投入了新的工作。
• He wrote his novel about his trip to Asia with zest.他兴趣浓厚的写了一本关于他亚洲之行的小说。

320 arbiter   

n.仲裁人，公断人

参考例句：

• Andrew was the arbiter of the disagreement.安德鲁是那场纠纷的仲裁人。
• Experiment is the final arbiter in science.实验是科学的最后仲裁者。

321 mechanism   

n.机械装置；机构，结构

参考例句：

• The bones and muscles are parts of the mechanism of the body.骨骼和肌肉是人体的组成部件。
• The mechanism of the machine is very complicated.这台机器的结构是非常复杂的。

322 hesitation   

n.犹豫，踌躇

参考例句：

• After a long hesitation, he told the truth at last.踌躇了半天，他终于直说了。
• There was a certain hesitation in her manner.她的态度有些犹豫不决。

323 ethical   

adj.伦理的，道德的，合乎道德的

参考例句：

• It is necessary to get the youth to have a high ethical concept.必须使青年具有高度的道德观念。
• It was a debate which aroused fervent ethical arguments.那是一场引发强烈的伦理道德争论的辩论。

324 arrogance   

n.傲慢，自大

参考例句：

• His arrogance comes out in every speech he makes.他每次讲话都表现得骄傲自大。
• Arrogance arrested his progress.骄傲阻碍了他的进步。

325 materialistic   

a.唯物主义的，物质享乐主义的

参考例句：

• She made him both soft and materialistic. 她把他变成女性化而又实际化。
• Materialistic dialectics is an important part of constituting Marxism. 唯物辩证法是马克思主义的重要组成部分。

326 nil   

n.无，全无，零

参考例句：

• My knowledge of the subject is practically nil.我在这方面的知识几乎等于零。
• Their legal rights are virtually nil.他们实际上毫无法律权利。

327 inductions   

归纳（法）( induction的名词复数 )； （电或磁的）感应； 就职； 吸入

参考例句：

328 brook   

n.小河，溪；v.忍受，容让

参考例句：

• In our room we could hear the murmur of a distant brook.在我们房间能听到远处小溪汩汩的流水声。
• The brook trickled through the valley.小溪涓涓流过峡谷。

329 mingle   

vt.使混合，使相混；vi.混合起来；相交往

参考例句：

• If we mingle with the crowd,we should not be noticed.如果我们混在人群中，就不会被注意到。
• Oil will not mingle with water.油和水不相融。

330 arteries   

n.动脉( artery的名词复数 )；干线，要道

参考例句：

• Even grafting new blood vessels in place of the diseased coronary arteries has been tried. 甚至移植新血管代替不健康的冠状动脉的方法都已经试过。 来自《简明英汉词典》
• This is the place where the three main arteries of West London traffic met. 这就是伦敦西部三条主要交通干线的交汇处。 来自《简明英汉词典》

331 steadfast   

adj.固定的，不变的，不动摇的；忠实的；坚贞不移的

参考例句：

• Her steadfast belief never left her for one moment.她坚定的信仰从未动摇过。
• He succeeded in his studies by dint of steadfast application.由于坚持不懈的努力他获得了学业上的成功。

332 inveterate   

adj.积习已深的，根深蒂固的

参考例句：

• Hitler was not only an avid reader but also an inveterate underliner.希特勒不仅酷爱读书，还有写写划划的习惯。
• It is hard for an inveterate smoker to give up tobacco.要一位有多年烟瘾的烟民戒烟是困难的。

333 consorts   

n.配偶( consort的名词复数 )；（演奏古典音乐的）一组乐师；一组古典乐器；一起v.结伴( consort的第三人称单数 )；交往；相称；调和

参考例句：

• The crews of the Card and its consorts had eaten Christmas dinner in Casablanca before sailing. 在起航前“卡德”号和僚舰上的官兵已在卡萨布兰卡吃了圣诞晚餐。 来自《现代汉英综合大词典》
• If he consorts with persons unsuitable to him, his bishop will interfere. 如果他和不适合他去结交的人来往，他的主教就会进行干涉。 来自辞典例句

334 aggregate   

adj.总计的，集合的；n.总数；v.合计；集合

参考例句：

• The football team had a low goal aggregate last season.这支足球队上个赛季的进球总数很少。
• The money collected will aggregate a thousand dollars.进帐总额将达一千美元。

335 constituents   

n.选民( constituent的名词复数 )；成分；构成部分；要素

参考例句：

• She has the full support of her constituents. 她得到本区选民的全力支持。
• Hydrogen and oxygen are the constituents of water. 氢和氧是水的主要成分。 来自《简明英汉词典》

336 susceptible   

adj.过敏的，敏感的；易动感情的，易受感动的

参考例句：

• Children are more susceptible than adults.孩子比成人易受感动。
• We are all susceptible to advertising.我们都易受广告的影响。

337 plausible   

adj.似真实的，似乎有理的，似乎可信的

参考例句：

• His story sounded plausible.他说的那番话似乎是真实的。
• Her story sounded perfectly plausible.她的说辞听起来言之有理。

338 winding   

n.绕，缠，绕组，线圈

参考例句：

• A winding lane led down towards the river.一条弯弯曲曲的小路通向河边。
• The winding trail caused us to lose our orientation.迂回曲折的小道使我们迷失了方向。

339 modification   

n.修改，改进，缓和，减轻

参考例句：

• The law,in its present form,is unjust;it needs modification.现行的法律是不公正的，它需要修改。
• The design requires considerable modification.这个设计需要作大的修改。

340 sleeper   

n.睡眠者，卧车，卧铺

参考例句：

• I usually go up to London on the sleeper. 我一般都乘卧车去伦敦。
• But first he explained that he was a very heavy sleeper. 但首先他解释说自己睡觉很沉。

341 miller   

n.磨坊主

参考例句：

• Every miller draws water to his own mill.磨坊主都往自己磨里注水。
• The skilful miller killed millions of lions with his ski.技术娴熟的磨坊主用雪橇杀死了上百万头狮子。

342 preoccupied   

adj.全神贯注的，入神的；被抢先占有的；心事重重的v.占据（某人）思想，使对…全神贯注，使专心于( preoccupy的过去式)

参考例句：

• He was too preoccupied with his own thoughts to notice anything wrong. 他只顾想着心事，没注意到有什么不对。
• The question of going to the Mount Tai preoccupied his mind. 去游泰山的问题盘踞在他心头。 来自《简明英汉词典》

343 inhibited   

a.拘谨的，拘束的

参考例句：

• Boys are often more inhibited than girls about discussing their problems. 男孩子往往不如女孩子敢于谈论自己的问题。
• Having been laughed at for his lameness,the boy became shy and inhibited. 那男孩因跛脚被人讥笑，变得羞怯而压抑。

344 overflow   

v.(使)外溢，(使)溢出；溢出，流出，漫出

参考例句：

• The overflow from the bath ran on to the floor.浴缸里的水溢到了地板上。
• After a long period of rain,the river may overflow its banks.长时间的下雨天后，河水可能溢出岸来。

345 extruded   

v.挤压出( extrude的过去式和过去分词 )；挤压成；突出；伸出

参考例句：

• Lava is extruded from the volcano. 熔岩从火山中喷出。
• Plastic material is extruded through very small holes to form fibres. 塑料从细孔中挤压出来形成纤维。 来自《现代英汉综合大词典》

346 extrusion   

n.挤出；推出；喷出；赶出

参考例句：

• The dough was formed into tubular grains by extrusion. 药团通过挤压而成管状药。 来自辞典例句
• Some other materials are added to facilitate extrusion and other manufacturing operations. 添加其它的一些物质是为了使挤压和别的加工过程更为方便。 来自辞典例句

347 insignificant   

adj.无关紧要的，可忽略的，无意义的

参考例句：

• In winter the effect was found to be insignificant.在冬季，这种作用是不明显的。
• This problem was insignificant compared to others she faced.这一问题与她面临的其他问题比较起来算不得什么。

348 instigating   

v.使（某事物）开始或发生，鼓动( instigate的现在分词 )

参考例句：

• Distant but clear Longyin instigating the eardrums of every person. 遥远却清晰的龙吟鼓动着每一个人的耳膜。 来自互联网
• The leader was charged with instigating the workers to put down tools. 那位领导人被指控煽动工人罢工。 来自互联网