Book III chapter 9

What has been said of the bladder is equally true of the kidneys. For these also are wanting in all animals that are clad with feathers or with scales or with scale-like plates; the sea and land tortoises forming the only exception. In some of the birds, however, there are flattened¹ kidney like bodies, as though the flesh allotted² to the formation of the kidneys, unable to find one single place of sufficient size, had been scattered³ over several.

The Emys has neither bladder nor kidneys. For the softness of its shell allows of the ready transpiration⁴ of fluid; and for this reason neither of the organs mentioned exists in this animal. All other animals, however, whose lung contains blood are, as before said, provided with kidneys. For nature uses these organs for two separate purposes, namely for the excretion of the residual⁵ fluid, and to subserve the blood-vessels, a channel leading to them from the great vessel⁶.

In the centre of the kidney is a cavity of variable size. This is the case in all animals, excepting the seal. The kidneys of this animal are more solid than those of any other, and in form resemble the kidneys of the ox. The human kidneys are of similar shape; being as it were made up of numerous small kidneys, and not presenting one unbroken surface like the kidneys of sheep and other quadrupeds. For this reason, should the kidneys of a man be once attacked by disease, the malady⁷ is not easily expelled. For it is as though many kidneys were diseased and not merely one; which naturally enhances the difficulties of a cure.

The duct which runs to the kidney from the great vessel does not terminate in the central cavity, but is expended⁸ on the substance of the organ, so that there is no blood in the cavity, nor is any coagulum found there after death. A pair of stout⁹ ducts, void of blood, run, one from the cavity of each kidney, to the bladder; and other ducts, strong and continuous, lead into the kidneys from the aorta¹⁰. The purpose of this arrangement is to allow the superfluous¹¹ fluid to pass from the blood-vessel into the kidney, and the resulting renal excretion to collect by the percolation¹² of the fluid through the solid substance of the organ, in its centre, where as a general rule there is a cavity. (This by the way explains why the kidney is the most ill-savoured of all the viscera.) From the central cavity the fluid is discharged into the bladder by the ducts that have been mentioned, having already assumed in great degree the character of excremental¹³ residue¹⁴. The bladder is as it were moored¹⁵ to the kidneys; for, as already has been stated, it is attached to them by strong ducts. These then are the purposes for which the kidneys exist, and such the functions of these organs.

In all animals that have kidneys, that on the right is placed higher than that on the left. For inasmuch as motion commences from the right, and the organs on this side are in consequence stronger than those on the left, they must all push upwards¹⁶ in advance of their opposite fellows; as may be seen in the fact that men even raise the right eyebrow¹⁷ more than the left, and that the former is more arched than the latter. The right kidney being thus drawn¹⁸ upwards is in all animals brought into contact with the liver; for the liver lies on the right side.

Of all the viscera the kidneys are those that have the most fat. This is in the first place the result of necessity, because the kidneys are the parts through which the residual matters percolate¹⁹. For the blood which is left behind after this excretion, being of pure quality, is of easy concoction²¹, and the final result of thorough blood-concoction is lard and suet. For just as a certain amount of fire is left in the ashes of solid substances after combustion²², so also does a remnant of the heat that has been developed remain in fluids after concoction; and this is the reason why oily matter is light, and floats on the surface of other fluids. The fat is not formed in the kidneys themselves, the density²³ of their substance forbidding this, but is deposited about their external surface. It consists of lard or of suet, according as the animal’s fat is of the former or latter character. The difference between these two kinds of fat has already been set forth²⁴ in other passages. The formation, then, of fat in the kidneys is the result of necessity; being, as explained, a consequence of the necessary conditions which accompany the possession of such organs. But at the same time the fat has a final cause, namely to ensure the safety of the kidneys, and to maintain their natural heat. For placed, as these organs are, close to the surface, they require a greater supply of heat than other parts. For while the back is thickly covered with flesh, so as to form a shield for the heart and neighbouring viscera, the loins, in accordance with a rule that applies to all bendings, are destitute²⁵ of flesh; and fat is therefore formed as a substitute for it, so that the kidneys may not be without protection. The kidneys, moreover, by being fat are the better enabled to secrete²⁶ and concoct²⁰ their fluid; for fat is hot, and it is heat that effects concoction.

Such, then, are the reasons why the kidneys are fat. But in all animals the right kidney is less fat than its fellow. The reason for this is, that the parts on the right side are naturally more solid and more suited for motion than those on the left. But motion is antagonistic²⁷ to fat, for it tends to melt it.

Animals then, as a general rule, derive²⁸ advantage from their kidneys being fat; and the fat is often very abundant and extends over the whole of these organs. But, should the like occur in the sheep, death ensues. Be its kidneys, however, as fat as they may, they are never so fat but that some part, if not in both at any rate in the right one, is left free. The reason why sheep are the only animals that suffer in this manner, or suffer more than others, is that in animals whose fat is composed of lard this is of fluid consistency²⁹, so that there is not the same chance in their case of wind getting shut in and causing mischief³⁰. But it is to such an enclosure of wind that rot is due. And thus even in men, though it is beneficial to them to have fat kidneys, yet should these organs become over-fat and diseased, deadly pains ensue. As to those animals whose fat consists of suet, in none is the suet so dense³¹ as in the sheep, neither is it nearly so abundant; for of all animals there is none in which the kidneys become so soon gorged³² with fat as in the sheep. Rot, then, is produced by the moisture and the wind getting shut up in the kidneys, and is a malady that carries off sheep with great rapidity. For the disease forthwith reaches the heart, passing thither³³ by the aorta and the great vessel, the ducts which connect these with the kidneys being of unbroken continuity.

1 flattened   

[医]（水）平扁的，弄平的

参考例句：

• She flattened her nose and lips against the window. 她把鼻子和嘴唇紧贴着窗户。
• I flattened myself against the wall to let them pass. 我身体紧靠着墙让他们通过。

2 allotted   

分配，拨给，摊派( allot的过去式和过去分词 )

参考例句：

• I completed the test within the time allotted . 我在限定的时间内完成了试验。
• Each passenger slept on the berth allotted to him. 每个旅客都睡在分配给他的铺位上。

3 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。

4 transpiration   

n.蒸发

参考例句：

• These analyses depend on a number of potentially confounding factors such as nonstomatal transpiration and temperature. 这些分析取决于非气孔蒸腾和温度这样一些可能混淆的因素。
• Loss of water also includes the transpiration of water to the atmosphere from plants. 水的散失也包括从植物体中蒸腾到大气层中的水。

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 vessel   

n.船舶；容器，器皿；管，导管，血管

参考例句：

• The vessel is fully loaded with cargo for Shanghai.这艘船满载货物驶往上海。
• You should put the water into a vessel.你应该把水装入容器中。

7 malady   

n.病，疾病(通常做比喻)

参考例句：

• There is no specific remedy for the malady.没有医治这种病的特效药。
• They are managing to control the malady into a small range.他们设法将疾病控制在小范围之内。

8 expended   

v.花费( expend的过去式和过去分词 )；使用（钱等）做某事；用光；耗尽

参考例句：

• She expended all her efforts on the care of home and children. 她把所有精力都花在料理家务和照顾孩子上。
• The enemy had expended all their ammunition. 敌人已耗尽所有的弹药。 来自《简明英汉词典》

10 aorta   

n.主动脉

参考例句：

• The abdominal aorta is normally smaller than the thoracic aorta.腹主动脉一般比胸主动脉小。
• Put down that jelly doughnut and look carefully at this aorta.放下手头上的东西，认真观察这张大动脉图片。

11 superfluous   

adj.过多的，过剩的，多余的

参考例句：

• She fined away superfluous matter in the design. 她删去了这图案中多余的东西。
• That request seemed superfluous when I wrote it.我这样写的时候觉得这个请求似乎是多此一举。

12 percolation   

n.过滤，浸透；渗滤；渗漏

参考例句：

• This corresponds to the percolation phase of the drying mechanism. 这相当于干化机理的渗滤阶段。 来自辞典例句
• The percolation clusters with various occupying probability are constructed. 构造了具有不同占据概率的逾渗集团。 来自互联网

13 excremental   

adj.排泄物的，粪便的

参考例句：

14 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。

15 moored   

adj. 系泊的 动词moor的过去式和过去分词形式

参考例句：

• The ship is now permanently moored on the Thames in London. 该船现在永久地停泊在伦敦泰晤士河边。
• We shipped (the) oars and moored alongside the bank. 我们收起桨，把船泊在岸边。

16 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。

17 eyebrow   

n.眉毛，眉

参考例句：

• Her eyebrow is well penciled.她的眉毛画得很好。
• With an eyebrow raised,he seemed divided between surprise and amusement.他一只眉毛扬了扬，似乎既感到吃惊，又觉有趣。

18 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。

19 percolate   

v.过滤，渗透

参考例句：

• The rain will percolate through the soil.雨水渗入土中。
• New fashions took a long time to percolate down.新时尚要很长时间才能在大众中流行起来。

20 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。

21 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。

22 combustion   

n.燃烧；氧化；骚动

参考例句：

• We might be tempted to think of combustion.我们也许会联想到氧化。
• The smoke formed by their combustion is negligible.由它燃烧所生成的烟是可忽略的。

23 density   

n.密集，密度，浓度

参考例句：

• The population density of that country is 685 per square mile.那个国家的人口密度为每平方英里685人。
• The region has a very high population density.该地区的人口密度很高。

24 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。

25 destitute   

adj.缺乏的；穷困的

参考例句：

• They were destitute of necessaries of life.他们缺少生活必需品。
• They are destitute of common sense.他们缺乏常识。

26 secrete   

vt.分泌；隐匿，使隐秘

参考例句：

• The pores of your body secrete sweat.身上的毛孔分泌汗液。
• Squirrels secrete a supply of nuts for winter.松鼠为准备过冬而藏坚果。

27 antagonistic   

adj.敌对的

参考例句：

• He is always antagonistic towards new ideas.他对新思想总是持反对态度。
• They merely stirred in a nervous and wholly antagonistic way.他们只是神经质地，带着完全敌对情绪地骚动了一下。

28 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。

29 consistency   

n.一贯性，前后一致，稳定性；(液体的)浓度

参考例句：

• Your behaviour lacks consistency.你的行为缺乏一贯性。
• We appreciate the consistency and stability in China and in Chinese politics.我们赞赏中国及其政策的连续性和稳定性。

30 mischief   

n.损害，伤害，危害；恶作剧，捣蛋，胡闹

参考例句：

• Nobody took notice of the mischief of the matter. 没有人注意到这件事情所带来的危害。
• He seems to intend mischief.看来他想捣蛋。

31 dense   

a.密集的，稠密的，浓密的；密度大的

参考例句：

• The general ambushed his troops in the dense woods. 将军把部队埋伏在浓密的树林里。
• The path was completely covered by the dense foliage. 小路被树叶厚厚地盖了一层。

32 gorged   

v.（用食物把自己）塞饱，填饱( gorge的过去式和过去分词 )；作呕

参考例句：

• He gorged himself at the party. 在宴会上他狼吞虎咽地把自己塞饱。 来自《简明英汉词典》
• The men, gorged with food, had unbuttoned their vests. 那些男人，吃得直打饱嗝，解开了背心的钮扣。 来自辞典例句

33 thither   

adv.向那里；adj.在那边的，对岸的

参考例句：

• He wandered hither and thither looking for a playmate.他逛来逛去找玩伴。
• He tramped hither and thither.他到处流浪。