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Book I chapter 2
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Thus we shall enquire1, in the course of this treatise2, from what faculties3 these effects themselves, as well as any other effects of nature which there may be, take their origin.

First, however, we must distinguish and explain clearly the various terms which we are going to use in this treatise, and to what things we apply them; and this will prove to be not merely an explanation of terms but at the same time a demonstration4 of the effects of nature.

When, therefore, such and such a body undergoes no change from its existing state, we say that it is at rest; but, not withstanding, if it departs from this in any respect we then say that in this respect it undergoes motion. Accordingly, when it departs in various ways from its preexisting state, it will be said to undergo various kinds of motion. Thus, if that which is white becomes black, or what is black becomes white, it undergoes motion in respect to colour; or if what was previously5 sweet now becomes bitter, or, conversely, from being bitter now becomes sweet, it will be said to undergo motion in respect to flavour; to both of these instances, as well as to those previously mentioned, we shall apply the term qualitative6 motion. And further, it is not only things which are altered in regard to colour and flavour which, we say, undergo motion; when a warm thing becomes cold, and a cold warm, here too we speak of its undergoing motion; similarly also when anything moist becomes dry, or dry moist. Now, the common term which we apply to all these cases is alteration7.

This is one kind of motion. But there is another kind which occurs in bodies which change their position, or as we say, pass from one place to another; the name of this is transference.

These two kinds of motion, then, are simple and primary, while compounded from them we have growth and decay, as when a small thing becomes bigger, or a big thing smaller, each retaining at the same time its particular form. And two other kinds of motion are genesis and destruction, genesis being a coming into existence, and destruction being the opposite.

Now, common to all kinds of motion is change from the preexisting state, while common to all conditions of rest is retention8 of the preexisting state. The Sophists, however, while allowing that bread in turning into blood becomes changed as regards sight, taste, and touch, will not agree that this change occurs in reality. Thus some of them hold that all such phenomena9 are tricks and illusions of our senses; the senses, they say, are affected10 now in one way, now in another, whereas the underlying11 substance does not admit of any of these changes to which the names are given. Others (such as Anaxagoras) will have it that the qualities do exist in it, but that they are unchangeable and immutable12 from eternity13 to eternity, and that these apparent alterations14 are brought about by separation and combination.

Now, if I were to go out of my way to confute these people, my subsidiary task would be greater than my main one. Thus, if they do not know all that has been written, “On Complete Alteration of Substance” by Aristotle, and after him by Chrysippus, I must beg of them to make themselves familiar with these men’s writings. If, however, they know these, and yet willingly prefer the worse views to the better, they will doubtless consider my arguments foolish also. I have shown elsewhere that these opinions were shared by Hippocrates, who lived much earlier than Aristotle. In fact, all those known to us who have been both physicians and philosophers Hippocrates was the first who took in hand to demonstrate that there are, in all, four mutually interacting qualities, and that to the operation of these is due the genesis and destruction of all things that come into and pass out of being. Nay15, more; Hippocrates was also the first to recognise that all these qualities undergo an intimate mingling16 with one another; and at least the beginnings of the proofs to which Aristotle later set his hand are to be found first in the writings of Hippocrates.

As to whether we are to suppose that the substances as well as their qualities undergo this intimate mingling, as Zeno of Citium afterwards declared, I do not think it necessary to go further into this question in the present treatise; for immediate17 purposes we only need to recognize the complete alteration of substance. In this way, nobody will suppose that bread represents a kind of meeting-place for bone, flesh, nerve, and all the other parts, and that each of these subsequently becomes separated in the body and goes to join its own kind; before any separation takes place, the whole of the bread obviously becomes blood; (at any rate, if a man takes no other food for a prolonged period, he will have blood enclosed in his veins19 all the same). And clearly this disproves the view of those who consider the elements unchangeable, as also, for that matter, does the oil which is entirely20 used up in the flame of the lamp, or the faggots which, in a somewhat longer time, turn into fire.

I said, however, that I was not going to enter into an argument with these people, and it was only because the example was drawn21 from the subject-matter of medicine, and because I need it for the present treatise, that I have mentioned it. We shall then, as I said, renounce22 our controversy23 with them, since those who wish may get a good grasp of the views of the ancients from our own personal investigations24 into these matters.

The discussion which follows we shall devote entirely, as we originally proposed, to an enquiry into the number and character of the faculties of Nature, and what is the effect which each naturally produces. Now, of course, I mean by an effect that which has already come into existence and has been completed by the activity of these faculties — for example, blood, flesh, or nerve. And activity is the name I give to the active change or motion, and the cause of this I call a faculty25. Thus, when food turns into blood, the motion of the food is passive, and that of the vein18 active. Similarly, when the limbs have their position their position altered, it is the muscle which produces, and the bones which undergo the motion. In these cases I call the motion of the vein and of the muscle an activity, and that of the food and the bones a symptom or affection, since the first group undergoes alteration and the second group is merely transported. One might, therefore, also speak of the activity as an effect of Nature — for example, digestion26, absorption, blood-production; one could not, however, in every case call the effect an activity; thus flesh is an effect of Nature, but it is, of course, not an activity. It is, therefore, clear that one of these terms is used in two senses, but not the other.

点击收听单词发音收听单词发音  

1 enquire 2j5zK     
v.打听,询问;调查,查问
参考例句:
  • She wrote to enquire the cause of the delay.她只得写信去询问拖延的理由。
  • We will enquire into the matter.我们将调查这事。
2 treatise rpWyx     
n.专著;(专题)论文
参考例句:
  • The doctor wrote a treatise on alcoholism.那位医生写了一篇关于酗酒问题的论文。
  • This is not a treatise on statistical theory.这不是一篇有关统计理论的论文。
3 faculties 066198190456ba4e2b0a2bda2034dfc5     
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》
4 demonstration 9waxo     
n.表明,示范,论证,示威
参考例句:
  • His new book is a demonstration of his patriotism.他写的新书是他的爱国精神的证明。
  • He gave a demonstration of the new technique then and there.他当场表演了这种新的操作方法。
5 previously bkzzzC     
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。
6 qualitative JC4yi     
adj.性质上的,质的,定性的
参考例句:
  • There are qualitative differences in the way children and adults think.孩子和成年人的思维方式有质的不同。
  • Arms races have a quantitative and a qualitative aspects.军备竞赛具有数量和质量两个方面。
7 alteration rxPzO     
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。
8 retention HBazK     
n.保留,保持,保持力,记忆力
参考例句:
  • They advocate the retention of our nuclear power plants.他们主张保留我们的核电厂。
  • His retention of energy at this hour is really surprising.人们惊叹他在这个时候还能保持如此旺盛的精力。
9 phenomena 8N9xp     
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。
10 affected TzUzg0     
adj.不自然的,假装的
参考例句:
  • She showed an affected interest in our subject.她假装对我们的课题感到兴趣。
  • His manners are affected.他的态度不自然。
11 underlying 5fyz8c     
adj.在下面的,含蓄的,潜在的
参考例句:
  • The underlying theme of the novel is very serious.小说隐含的主题是十分严肃的。
  • This word has its underlying meaning.这个单词有它潜在的含义。
12 immutable ma9x3     
adj.不可改变的,永恒的
参考例句:
  • Nothing in the world is immutable.世界没有一成不变的东西。
  • They free our minds from considering our world as fixed and immutable.它们改变着人们将世界看作是永恒不变的观点。
13 eternity Aiwz7     
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。
14 alterations c8302d4e0b3c212bc802c7294057f1cb     
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》
15 nay unjzAQ     
adv.不;n.反对票,投反对票者
参考例句:
  • He was grateful for and proud of his son's remarkable,nay,unique performance.他为儿子出色的,不,应该是独一无二的表演心怀感激和骄傲。
  • Long essays,nay,whole books have been written on this.许多长篇大论的文章,不,应该说是整部整部的书都是关于这件事的。
16 mingling b387131b4ffa62204a89fca1610062f3     
adj.混合的
参考例句:
  • There was a spring of bitterness mingling with that fountain of sweets. 在这个甜蜜的源泉中间,已经掺和进苦涩的山水了。
  • The mingling of inconsequence belongs to us all. 这场矛盾混和物是我们大家所共有的。
17 immediate aapxh     
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。
18 vein fi9w0     
n.血管,静脉;叶脉,纹理;情绪;vt.使成脉络
参考例句:
  • The girl is not in the vein for singing today.那女孩今天没有心情唱歌。
  • The doctor injects glucose into the patient's vein.医生把葡萄糖注射入病人的静脉。
19 veins 65827206226d9e2d78ea2bfe697c6329     
n.纹理;矿脉( vein的名词复数 );静脉;叶脉;纹理
参考例句:
  • The blood flows from the capillaries back into the veins. 血从毛细血管流回静脉。 来自《简明英汉词典》
  • I felt a pleasant glow in all my veins from the wine. 喝过酒后我浑身的血都热烘烘的,感到很舒服。 来自《简明英汉词典》
20 entirely 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。
21 drawn MuXzIi     
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。
22 renounce 8BNzi     
v.放弃;拒绝承认,宣布与…断绝关系
参考例句:
  • She decided to renounce the world and enter a convent.她决定弃绝尘世去当修女。
  • It was painful for him to renounce his son.宣布与儿子脱离关系对他来说是很痛苦的。
23 controversy 6Z9y0     
n.争论,辩论,争吵
参考例句:
  • That is a fact beyond controversy.那是一个无可争论的事实。
  • We ran the risk of becoming the butt of every controversy.我们要冒使自己在所有的纷争中都成为众矢之的的风险。
24 investigations 02de25420938593f7db7bd4052010b32     
(正式的)调查( investigation的名词复数 ); 侦查; 科学研究; 学术研究
参考例句:
  • His investigations were intensive and thorough but revealed nothing. 他进行了深入彻底的调查,但没有发现什么。
  • He often sent them out to make investigations. 他常常派他们出去作调查。
25 faculty HhkzK     
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。
26 digestion il6zj     
n.消化,吸收
参考例句:
  • This kind of tea acts as an aid to digestion.这种茶可助消化。
  • This food is easy of digestion.这食物容易消化。


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