Book III chapter 14

Below the midriff lies the stomach, placed at the end of the oesophagus when there is one, and in immediate¹ contiguity² with the mouth when the oesophagus is wanting. Continuous with this stomach is what is called the gut³. These parts are present in all animals, for reasons that are self-evident. For it is a matter of necessity that an animal shall receive the incoming food; and necessary also that it shall discharge the same when its goodness is exhausted⁴. This residual⁵ matter, again, must not occupy the same place as the yet unconcocted nutriment. For as the ingress of food and the discharge of the residue⁷ occur at distinct periods, so also must they necessarily occur in distinct places. Thus there must be one receptacle for the ingoing food and another for the useless residue, and between these, therefore, a part in which the change from one condition to the other may be effected. These, however, are matters which will be more suitably set forth⁸ when we come to deal with Generation and Nutrition. What we have at present to consider are the variations presented by the stomach and its subsidiary parts. For neither in size nor in shape are these parts uniformly alike in all animals. Thus the stomach is single in all such sanguineous and viviparous animals as have teeth in front of both jaws⁹. It is single therefore in all the polydactylous kinds, such as man, dog, lion, and the rest; in all the solid-hoofed animals also, such as horse, mule¹², ass¹³; and in all those which, like the pig, though their hoof¹¹ is cloven, yet have front teeth in both jaws. When, however, an animal is of large size, and feeds on substances of so thorny¹⁴ and ligneous¹⁵ a character as to be difficult of concoction¹⁶, it may in consequence have several stomachs, as for instance is the case with the camel. A similar multiplicity of stomachs exists also in the horned animals; the reason being that horn-bearing animals have no front teeth in the upper jaw¹⁰. The camel also, though it has no horns, is yet without upper front teeth. The explanation of this is that it is more essential for the camel to have a multiple stomach than to have these teeth. Its stomach, then, is constructed like that of animals without upper front teeth, and, its dental arrangements being such as to match its stomach, the teeth in question are wanting. They would indeed be of no service. Its food, moreover, being of a thorny character, and its tongue necessarily made of a fleshy substance, nature uses the earthy matter which is saved from the teeth to give hardness to the palate. The camel ruminates¹⁸ like the horned animals, because its multiple stomach resembles theirs. For all animals that have horns, the sheep for instance, the ox, the goat, the deer, and the like, have several stomachs. For since the mouth, owing to its lack of teeth, only imperfectly performs its office as regards the food, this multiplicity of stomachs is intended to make up for its shortcomings; the several cavities receiving the food one from the other in succession; the first taking the unreduced substances, the second the same when somewhat reduced, the third when reduction is complete, and the fourth when the whole has become a smooth pulp²⁰. Such is the reason why there is this multiplicity of parts and cavities in animals with such dentition. The names given to the several cavities are the paunch, the honeycomb bag, the manyplies, and the reed. How these parts are related to each other, in position and in shape, must be looked for in the treatises²¹ on Anatomy²² and the Researches concerning Animals.

Birds also present variations in the part which acts as a recipient²³ of the food; and the reason for these variations is the same as in the animals just mentioned. For here again it is because the mouth fails to perform its office and fails even more completely-for birds have no teeth at all, nor any instrument whatsoever²⁴ with which to comminute or grind down their food-it is, I say, because of this, that in some of them what is called the crop precedes the stomach and does the work of the mouth; while in others the oesophagus is either wide throughout or a part of it bulges²⁵ just before it enters the stomach, so as to form a preparatory store-house for the unreduced food; or the stomach itself has a protuberance in some part, or is strong and fleshy, so as to be able to store up the food for a considerable period and to concoct⁶ it, in spite of its not having been ground into a pulp. For nature retrieves²⁶ the inefficiency²⁷ of the mouth by increasing the efficiency and heat of the stomach. Other birds there are, such, namely, as have long legs and live in marshes²⁸, that have none of these provisions, but merely an elongated²⁹ oesophagus. The explanation of this is to be found in the moist character of their food. For all these birds feed on substances easy of reduction, and their food being moist and not requiring much concoction, their digestive cavities are of a corresponding character.

Fishes are provided with teeth, which in almost all of them are of the sharp interfitting kind. For there is but one small section in which it is otherwise. Of these the fish called Scarus (Parrot-fish) is an example. And this is probably the reason why this fish apparently³⁰ ruminates, though no other fishes do so. For those horned animals that have no front teeth in the upper jaw also ruminate¹⁷.

In fishes the teeth are all sharp; so that these animals can divide their food, though imperfectly. For it is impossible for a fish to linger or spend time in the act of mastication³¹, and therefore they have no teeth that are flat or suitable for grinding; for such teeth would be to no purpose. The oesophagus again in some fishes is entirely³² wanting, and in the rest is but short. In order, however, to facilitate the concoction of the food, some of them, as the Cestreus (mullet), have a fleshy stomach resembling that of a bird; while most of them have numerous processes close against the stomach, to serve as a sort of antechamber in which the food may be stored up and undergo putrefaction³³ and concoction. There is contrast between fishes and birds in the position of these processes. For in fishes they are placed close to the stomach; while in birds, if present at all, they are lower down, near the end of the gut. Some of the Vivipara also have processes connected with the lower part of the gut which serve the same purpose as that stated above.

The whole tribe of fishes is of gluttonous³⁴ appetite, owing to the arrangements for the reduction of their food being very imperfect, and much of it consequently passing through them without undergoing concoction; and, of all, those are the most gluttonous that have a straight intestine³⁵. For as the passage of food in such cases is rapid, and the enjoyment³⁶ derived³⁷ from it in consequence but brief, it follows of necessity that the return of appetite is also speedy.

It has already been mentioned that in animals with front teeth in both jaws the stomach is of small size. It may be classed pretty nearly always under one or other of two headings, namely as resembling the stomach of the dog, or as resembling the stomach of the pig. In the pig the stomach is larger than in the dog, and presents certain folds of moderate size, the purpose of which is to lengthen³⁸ out the period of concoction; while the stomach of the dog is of small size, not much larger in calibre than the gut, and smooth on the internal surface.

Not much larger, I say, than the gut; for in all animals after the stomach comes the gut. This, like the stomach, presents numerous modifications³⁹. For in some animals it is uniform, when uncoiled, and alike throughout, while in others it differs in different portions. Thus in some cases it is wider in the neighbourhood of the stomach, and narrower towards the other end; and this explains by the way why dogs have to strain so much in discharging their excrement⁴⁰. But in most animals it is the upper portion that is the narrower and the lower that is of greater width.

Of greater length than in other animals, and much convoluted⁴¹, are the intestines⁴² of those that have horns. These intestines, moreover, as also the stomach, are of ampler volume, in accordance with the larger size of the body. For animals with horns are, as a rule, animals of no small bulk, because of the thorough elaboration which their food undergoes. The gut, except in those animals where it is straight, invariably widens out as we get farther from the stomach and come to what is called the colon⁴³, and to a kind of caecal dilatation. After this it again becomes narrower and convoluted. Then succeeds a straight portion which runs right on to the vent⁴⁴. This vent is known as the anus, and is in some animals surrounded by fat, in others not so. All these parts have been so contrived⁴⁵ by nature as to harmonize with the various operations that relate to the food and its residue. For, as the residual food gets farther on and lower down, the space to contain it enlarges, allowing it to remain stationary⁴⁶ and undergo conversion⁴⁷. Thus is it in those animals which, owing either to their large size, or to the heat of the parts concerned, require more nutriment, and consume more fodder⁴⁸ than the rest.

Neither is it without a purpose, that, just as a narrower gut succeeds to the upper stomach, so also does the residual food, when its goodness is thoroughly⁴⁹ exhausted, pass from the colon and the ample space of the lower stomach into a narrower channel and into the spiral coil. For so nature can regulate her expenditure⁵⁰ and prevent the excremental⁵¹ residue from being discharged all at once.

In all such animals, however, as have to be comparatively moderate in their alimentation, the lower stomach presents no wide and roomy spaces, though their gut is not straight, but has a number of convolutions. For amplitude⁵² of space causes desire for ample food, and straightness of the intestine causes quick return of appetite. And thus it is that all animals whose food receptacles are either simple or spacious⁵³ are of gluttonous habits, the latter eating enormously at a meal, the former making meals at short intervals⁵⁴.

Again, since the food in the upper stomach, having just been swallowed, must of necessity be quite fresh, while that which has reached the lower stomach must have had its juices exhausted and resemble dung, it follows of necessity that there must also be some intermediate part, in which the change may be effected, and where the food will be neither perfectly¹⁹ fresh nor yet dung. And thus it is that, in all such animals as we are now considering, there is found what is called the jejunum; which is a part of the small gut, of the gut, that is, which comes next to the stomach. For this jejunum lies between the upper cavity which contains the yet unconcocted food and the lower cavity which holds the residual matter, which by the time it has got here has become worthless. There is a jejunum in all these animals, but it is only plainly discernible in those of large size, and this only when they have abstained⁵⁵ from food for a certain time. For then alone can one hit on the exact period when the food lies half-way between the upper and lower cavities; a period which is very short, for the time occupied in the transition of food is but brief. In females this jejunum may occupy any part whatsoever of the upper intestine, but in males it comes just before the caecum and the lower stomach.

1 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。

2 contiguity   

n.邻近，接壤

参考例句：

• The contiguity of the house and the garage was a convenience in bad weather.住宅和车库毗邻，这在天气不好的时候是很方便的。
• Scientists want to investigate the relation between xerophthalmia occurrence and smut contiguity.科学家们打算探讨干眼症与煤尘接触之间的关系。

3 gut   

n.[pl.]胆量；内脏；adj.本能的；vt.取出内脏

参考例句：

• It is not always necessary to gut the fish prior to freezing.冷冻鱼之前并不总是需要先把内脏掏空。
• My immediate gut feeling was to refuse.我本能的直接反应是拒绝。

4 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。

5 residual   

adj.复播复映追加时间；存留下来的，剩余的

参考例句：

• There are still a few residual problems with the computer program.电脑程序还有一些残留问题。
• The resulting residual chromatism is known as secondary spectrum.所得到的剩余色差叫做二次光谱。

6 concoct   

v.调合，制造

参考例句：

• I gave her a tip on how to concoct a new kind of soup.我教她配制一种新汤的诀窍。
• I began to concoct explanations of my own.我开始思考自己的解释。

7 residue   

n.残余，剩余，残渣

参考例句：

• Mary scraped the residue of food from the plates before putting them under water.玛丽在把盘子放入水之前先刮去上面的食物残渣。
• Pesticide persistence beyond the critical period for control leads to residue problems.农药一旦超过控制的临界期，就会导致残留问题。

8 forth   

adv.向前；向外，往外

参考例句：

• The wind moved the trees gently back and forth.风吹得树轻轻地来回摇晃。
• He gave forth a series of works in rapid succession.他很快连续发表了一系列的作品。

9 jaws   

n.口部；嘴

参考例句：

• The antelope could not escape the crocodile's gaping jaws. 那只羚羊无法从鱷鱼张开的大口中逃脱。
• The scored jaws of a vise help it bite the work. 台钳上有刻痕的虎钳牙帮助它紧咬住工件。

10 jaw   

n.颚，颌，说教，流言蜚语；v.喋喋不休，教训

参考例句：

• He delivered a right hook to his opponent's jaw.他给了对方下巴一记右钩拳。
• A strong square jaw is a sign of firm character.强健的方下巴是刚毅性格的标志。

11 hoof   

n.(马，牛等的)蹄

参考例句：

• Suddenly he heard the quick,short click of a horse's hoof behind him.突然间，他听见背后响起一阵急骤的马蹄的得得声。
• I was kicked by a hoof.我被一只蹄子踢到了。

12 mule   

n.骡子，杂种，执拗的人

参考例句：

• A mule is a cross between a mare and a donkey.骡子是母马和公驴的杂交后代。
• He is an old mule.他是个老顽固。

13 ass   

n.驴；傻瓜，蠢笨的人

参考例句：

• He is not an ass as they make him.他不象大家猜想的那样笨。
• An ass endures his burden but not more than his burden.驴能负重但不能超过它能力所负担的。

14 thorny   

adj.多刺的，棘手的

参考例句：

• The young captain is pondering over a thorny problem.年轻的上尉正在思考一个棘手的问题。
• The boys argued over the thorny points in the lesson.孩子们辩论功课中的难点。

15 ligneous   

adj.木质的，木头的

参考例句：

• All these ligneous plants are imported from Russia.这些木本植物都是从俄国进口而来。
• A lot of ligneous door,bookcase in my home,ambry is to have breath,have life.我家里的很多木制的门、书柜、橱柜都是有呼吸、有生命的。

16 concoction   

n.调配(物)；谎言

参考例句：

• She enjoyed the concoction of foreign dishes.她喜欢调制外国菜。
• His story was a sheer concoction.他的故事实在是一纯属捏造之事。

17 ruminate   

v.反刍；沉思

参考例句：

• It is worth while to ruminate over his remarks.他的话值得玩味。
• The cow began to ruminate after eating up grass.牛吃完草后开始反刍。

18 ruminates   

v.沉思( ruminate的第三人称单数 )；反复考虑；反刍；倒嚼

参考例句：

• Where depression questions, ruminates and hesitates, mania answers with vigor and certainty. 当抑郁患者发出疑问、覆考虑，且裹足不前时，躁狂患者则以充份的活力与信心勇往直前。 来自互联网
• A cow ruminates its food. 牛反刍所吃的食物。 来自互联网

19 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。

20 pulp   

n.果肉，纸浆；v.化成纸浆，除去...果肉，制成纸浆

参考例句：

• The pulp of this watermelon is too spongy.这西瓜瓤儿太肉了。
• The company manufactures pulp and paper products.这个公司制造纸浆和纸产品。

21 treatises   

n.专题著作，专题论文，专著( treatise的名词复数 )

参考例句：

• Many treatises in different languages have been published on pigeons. 关于鸽类的著作，用各种文字写的很多。 来自辞典例句
• Many other treatises incorporated the new rigor. 许多其它的专题论文体现了新的严密性。 来自辞典例句

22 anatomy   

n.解剖学，解剖；功能，结构，组织

参考例句：

• He found out a great deal about the anatomy of animals.在动物解剖学方面，他有过许多发现。
• The hurricane's anatomy was powerful and complex.对飓风的剖析是一项庞大而复杂的工作。

23 recipient   

a.接受的,感受性强的 n.接受者,感受者,容器

参考例句：

• Please check that you have a valid email certificate for each recipient. 请检查是否对每个接收者都有有效的电子邮件证书。
• Colombia is the biggest U . S aid recipient in Latin America. 哥伦比亚是美国在拉丁美洲最大的援助对象。

24 whatsoever   

adv.（用于否定句中以加强语气）任何；pron.无论什么

参考例句：

• There's no reason whatsoever to turn down this suggestion.没有任何理由拒绝这个建议。
• All things whatsoever ye would that men should do to you,do ye even so to them.你想别人对你怎样，你就怎样对人。

25 bulges   

膨胀( bulge的名词复数 )； 鼓起； （身体的）肥胖部位； 暂时的激增

参考例句：

• His pocket bulges with apples. 他的衣袋装着苹果鼓了起来。
• He bulges out of his black T-shirt. 他的肚子在黑色T恤衫下鼓鼓地挺着。

26 retrieves   

v.取回( retrieve的第三人称单数 )；恢复；寻回；检索（储存的信息）

参考例句：

• The mole comes in later, retrieves the item and packs it back in his gear. 鼹鼠随后到达，找回东西然后用他的传送装置返回。 来自电影对白
• Retrieves the pitch of the current image, in bytes. 得到代表目前图像斜度的字节数。 来自互联网

27 inefficiency   

n.无效率，无能；无效率事例

参考例句：

• Conflict between management and workers makes for inefficiency in the workplace. 资方与工人之间的冲突使得工厂生产效率很低。 来自《简明英汉词典》
• This type of inefficiency arises because workers and management are ill-equipped. 出现此种低效率是因为工人与管理层都能力不足。 来自《简明英汉词典》

28 marshes   

n.沼泽，湿地( marsh的名词复数 )

参考例句：

• Cows were grazing on the marshes. 牛群在湿地上吃草。
• We had to cross the marshes. 我们不得不穿过那片沼泽地。 来自《简明英汉词典》

29 elongated   

v.延长，加长( elongate的过去式和过去分词 )

参考例句：

• Modigliani's women have strangely elongated faces. 莫迪里阿尼画中的妇女都长着奇长无比的脸。
• A piece of rubber can be elongated by streching. 一块橡皮可以拉长。 来自《用法词典》

30 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。

31 mastication   

n.咀嚼

参考例句：

• Regular like spike wave and poly spike wave were found in mastication. 在咀嚼时可见有规律性类似棘波、多棘波。 来自互联网
• Mastication is one of the most important fundamental oral functions. 咀嚼是口腔重要的生理功能之一。 来自互联网

32 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。

33 putrefaction   

n.腐坏，腐败

参考例句：

• Putrefaction is the anaerobic degradation of proteinaceous materials.腐败作用是蛋白性物质的厌氧降解作用。
• There is a clear difference between fermentation and putrefaction.发酵与腐败有明显区别。

34 gluttonous   

adj.贪吃的，贪婪的

参考例句：

• He is a gluttonous and lazy guy.他是个好吃懒做之徒。
• He is a selfish, gluttonous and lazy person.他是一个自私、贪婪又懒惰的人。

35 intestine   

adj.内部的；国内的；n.肠

参考例句：

• This vitamin is absorbed through the walls of the small intestine.这种维生素通过小肠壁被吸收。
• The service productivity is the function,including external efficiency,intestine efficiency and capacity efficiency.服务业的生产率是一个包含有外部效率、内部效率和能力效率的函数。

36 enjoyment   

n.乐趣；享有；享用

参考例句：

• Your company adds to the enjoyment of our visit. 有您的陪同，我们这次访问更加愉快了。
• After each joke the old man cackled his enjoyment.每逢讲完一个笑话，这老人就呵呵笑着表示他的高兴。

37 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》

38 lengthen   

vt.使伸长，延长

参考例句：

• He asked the tailor to lengthen his coat.他请裁缝把他的外衣放长些。
• The teacher told her to lengthen her paper out.老师让她把论文加长。

39 modifications   

n.缓和( modification的名词复数 )；限制；更改；改变

参考例句：

• The engine was pulled apart for modifications and then reassembled. 发动机被拆开改型，然后再组装起来。 来自《简明英汉词典》
• The original plan had undergone fairly extensive modifications. 原计划已经作了相当大的修改。 来自《简明英汉词典》

40 excrement   

n.排泄物，粪便

参考例句：

• The cage smelled of excrement.笼子里粪臭熏人。
• Clothing can also become contaminated with dust,feathers,and excrement.衣着则会受到微尘、羽毛和粪便的污染。

41 convoluted   

adj.旋绕的；复杂的

参考例句：

• The snake slithered through a convoluted path.蛇在羊肠小道上爬行。
• The policy is so convoluted even college presidents are confused.这项政策太令人费解，甚至连大学校长们也是一头雾水。

42 intestines   

n.肠( intestine的名词复数 )

参考例句：

• Perhaps the most serious problems occur in the stomach and intestines. 最严重的问题或许出现在胃和肠里。 来自辞典例句
• The traps of carnivorous plants function a little like the stomachs and small intestines of animals. 食肉植物的捕蝇器起着动物的胃和小肠的作用。 来自辞典例句

43 colon   

n.冒号，结肠，直肠

参考例句：

• Here,too,the colon must be followed by a dash.这里也是一样，应当在冒号后加破折号。
• The colon is the locus of a large concentration of bacteria.结肠是大浓度的细菌所在地。

44 vent   

n.通风口，排放口；开衩；vt.表达，发泄

参考例句：

• He gave vent to his anger by swearing loudly.他高声咒骂以发泄他的愤怒。
• When the vent became plugged,the engine would stop.当通风口被堵塞时，发动机就会停转。

45 contrived   

adj.不自然的，做作的；虚构的

参考例句：

• There was nothing contrived or calculated about what he said.他说的话里没有任何蓄意捏造的成分。
• The plot seems contrived.情节看起来不真实。

46 stationary   

adj.固定的，静止不动的

参考例句：

• A stationary object is easy to be aimed at.一个静止不动的物体是容易瞄准的。
• Wait until the bus is stationary before you get off.你要等公共汽车停稳了再下车。

47 conversion   

n.转化，转换，转变

参考例句：

• He underwent quite a conversion.他彻底变了。
• Waste conversion is a part of the production process.废物处理是生产过程的一个组成部分。

48 fodder   

n.草料；炮灰

参考例句：

• Grass mowed and cured for use as fodder.割下来晒干用作饲料的草。
• Guaranteed salt intake, no matter which normal fodder.不管是那一种正常的草料，保证盐的摄取。

49 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。

50 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。

51 excremental   

adj.排泄物的，粪便的

参考例句：

52 amplitude   

n.广大；充足；振幅

参考例句：

• The amplitude of the vibration determines the loudness of the sound.振动幅度的大小决定声音的大小。
• The amplitude at the driven end is fixed by the driving mechanism.由于驱动机构的作用,使驱动端的振幅保持不变。

53 spacious   

adj.广阔的，宽敞的

参考例句：

• Our yard is spacious enough for a swimming pool.我们的院子很宽敞，足够建一座游泳池。
• The room is bright and spacious.这房间很豁亮。

54 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。

55 abstained   

v.戒（尤指酒），戒除( abstain的过去式和过去分词 )；弃权（不投票）

参考例句：

• Ten people voted in favour, five against and two abstained. 十人投票赞成，五人反对，两人弃权。
• They collectively abstained (from voting) in the elections for local councilors. 他们在地方议会议员选举中集体弃权。 来自《简明英汉词典》