Chapter 27

Respiration¹ takes place when the hot substance which is the seat of the nutritive principle increases. For it, like the rest of the body, requires nutrition, and more so than the members, for it is through it that they are nourished. But when it increases it necessarily causes the organ to rise. This organ we must to be constructed like the bellows² in a smithy, for both heart and lungs conform pretty well to this shape. Such a structure must be double, for the nutritive principle must be situated³ in the centre of the natural force.

Thus on increase of bulk expansion results, which necessarily causes the surrounding parts to rise. Now this can be seen to occur when people respire; they raise their chest because the motive⁴ principle of the organ described resident within the chest causes an identical expansion of this organ. When it dilates⁵ the outer air must rush in as into a bellows, and, being cold, by its chilling influence reduces by extinction⁷ the excess of the fire. But, as the increase of bulk causes the organ to dilate⁶, so diminution⁸ causes contraction⁹, and when it collapses¹⁰ the air which entered must pass out again. When it enters the air is cold, but on issuing it is warm owing to its contact with the heat resident in this organ, and this is specially¹¹ the case in those animals that possess a full-blooded lung. The numerous canal-like ducts in the lung, into which it passes, have each a blood-vessel lying alongside, so that the whole lung is thought to be full of blood. The inward passage of the air is called respiration, the outward expiration¹², and this double movement goes on continuously just so long as the animal lives and keeps this organ in continuous motion; it is for this reason that life is bound up with the passage of the breath outwards¹³ and inwards.

It is in the same way that the motion of the gills in fishes takes place. When the hot substance in the blood throughout the members rises, the gills rise too, and let the water pass through, but when it is chilled and retreats through its channels to the heart, they contract and eject the water. Continually as the heat in the heart rises, continually on being chilled it returns thither¹⁴ again. Hence, as in respiring animals life and death are bound up with respiration, so in the other animals class they depend on the admission of water.

Our discussion of life and death and kindred topics is now practically complete. But health and discase also claim the attention of the scientist, and not mercly of the physician, in so far as an account of their causes is concerned. The extent to which these two differ and investigate diverse provinces must not escape us, since facts show that their inquiries¹⁵ are, to a certain extent, at least conterminous. For physicians of culture and refinement¹⁶ make some mention of natural science, and claim to derive¹⁷ their principles from it, while the most accomplished¹⁸ investigators¹⁹ into nature generally push their studies so far as to conclude with an account of medical principles.

The End

1 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。

2 bellows   

n.风箱；发出吼叫声，咆哮（尤指因痛苦）( bellow的名词复数 )；（愤怒地）说出（某事），大叫v.发出吼叫声，咆哮（尤指因痛苦）( bellow的第三人称单数 )；（愤怒地）说出（某事），大叫

参考例句：

• His job is to blow the bellows for the blacksmith. 他的工作是给铁匠拉风箱。 来自辞典例句
• You could, I suppose, compare me to a blacksmith's bellows. 我想，你可能把我比作铁匠的风箱。 来自辞典例句

3 situated   

adj.坐落在...的，处于某种境地的

参考例句：

• The village is situated at the margin of a forest.村子位于森林的边缘。
• She is awkwardly situated.她的处境困难。

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 dilates   

v.（使某物）扩大，膨胀，张大( dilate的第三人称单数 )

参考例句：

• Gas dilates the balloon. 气体使汽球膨胀。 来自《现代英汉综合大词典》
• Exercise dilates blood vessels on the surface of the brain. 运动会使大脑表层的血管扩张。 来自辞典例句

6 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。

7 extinction   

n.熄灭，消亡，消灭，灭绝，绝种

参考例句：

• The plant is now in danger of extinction.这种植物现在有绝种的危险。
• The island's way of life is doomed to extinction.这个岛上的生活方式注定要消失。

8 diminution   

n.减少；变小

参考例句：

• They hope for a small diminution in taxes.他们希望捐税能稍有减少。
• He experienced no diminution of his physical strength.他并未感觉体力衰落。

9 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。

10 collapses   

折叠( collapse的第三人称单数 )； 倒塌； 崩溃； （尤指工作劳累后）坐下

参考例句：

• This bridge table collapses. 这张桥牌桌子能折叠。
• Once Russia collapses, the last chance to stop Hitler will be gone. 一旦俄国垮台，抑止希特勒的最后机会就没有了。

11 specially   

adv.特定地；特殊地；明确地

参考例句：

• They are specially packaged so that they stack easily.它们经过特别包装以便于堆放。
• The machine was designed specially for demolishing old buildings.这种机器是专为拆毁旧楼房而设计的。

12 expiration   

n.终结，期满，呼气，呼出物

参考例句：

• Can I have your credit card number followed by the expiration date?能告诉我你的信用卡号码和它的到期日吗?
• This contract shall be terminated on the expiration date.劳动合同期满，即行终止。

13 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。

14 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。

15 inquiries   

n.调查( inquiry的名词复数 )；疑问；探究；打听

参考例句：

• He was released on bail pending further inquiries. 他获得保释，等候进一步调查。
• I have failed to reach them by postal inquiries. 我未能通过邮政查询与他们取得联系。 来自《现代汉英综合大词典》

16 refinement   

n.文雅；高尚；精美；精制；精炼

参考例句：

• Sally is a woman of great refinement and beauty. 莎莉是个温文尔雅又很漂亮的女士。
• Good manners and correct speech are marks of refinement.彬彬有礼和谈吐得体是文雅的标志。

17 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。

18 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。

19 investigators   

n.调查者，审查者( investigator的名词复数 )

参考例句：

• This memo could be the smoking gun that investigators have been looking for. 这份备忘录可能是调查人员一直在寻找的证据。
• The team consisted of six investigators and two secretaries. 这个团队由六个调查人员和两个秘书组成。 来自《简明英汉词典》