Book III chapter 1

It has been made clear in the preceding discussion that nutrition occurs by an alteration¹ or assimilation of that which nourishes to that which receives nourishment², and that there exists in every part of the animal a faculty³ which in view of its activity we call, in general terms, alterative⁴, or, more specifically, assimilative and nutritive. It was also shown that a sufficient supply of the matter which the part being nourished makes into nutriment for itself is ensured by virtue⁵ of another faculty which naturally attracts its proper juice [humour] that juice is proper to each part which is adapted for assimilation, and that the faculty which attracts the juice is called, by reason of its activity, attractive or epispastic. It has also been shown that assimilation is preceded by adhesion, and this, again, by presentation, the latter stage being, as one might say, the end or goal of the activity corresponding to the attractive faculty. For the actual bringing up of nutriment from the veins⁶ into each of the parts takes place through the activation⁷ of the attractive faculty, whilst to have been finally brought up and presented to the part is the actual end for which we desired such an activity; it is attracted in order that it may be presented. After this, considerable time is needed for the nutrition of the animal; whilst a thing may be even rapidly attracted, on the other hand to become adherent⁸, altered, and entirely⁹ assimilated to the part which is being nourished and to become a part of it, cannot take place suddenly, but requires a considerable amount of time. But if the nutritive juice, so presented, does not remain in the part, but withdraws to another one, and keeps flowing away, and constantly changing and shifting its position, neither adhesion nor complete assimilation will take place in any of them. Here too, then, the [animal’s] nature has need of some other faculty for ensuring a prolonged stay of the presented juice at the part, and this not a faculty which comes in from somewhere outside but one which is resident in the part which is to be nourished. This faculty, again, in view of its activity our predecessors¹⁰ were obliged to call retentive¹¹.

Thus our argument has clearly shown the necessity for the genesis of such a faculty, and whoever has an appreciation¹² of logical sequence must be firmly persuaded from what we have said that, if it be laid down and proved by previous demonstration¹³ that Nature is artistic¹⁴ and solicitous¹⁵ for the animal’s welfare, it necessarily follows that she must also possess a faculty of this kind.

1 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。

2 nourishment   

n.食物，营养品；营养情况

参考例句：

• Lack of proper nourishment reduces their power to resist disease.营养不良降低了他们抵抗疾病的能力。
• He ventured that plants draw part of their nourishment from the air.他大胆提出植物从空气中吸收部分养分的观点。

3 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。

4 alterative   

adj.（趋于）改变的，变质的，使体质逐渐康复的n.变质剂，体质改善疗法

参考例句：

• The more alterative, the more difficult the choice. 选择越多，愈难抉择。 来自互联网
• This paper propose a novel alterative step LMS auto-adapted filter algorithm based on mean squared-error estimation. 介绍了一种基于均方误差估计的新变步长LMS自适应滤波算法。 来自互联网

5 virtue   

n.德行，美德；贞操；优点；功效，效力

参考例句：

• He was considered to be a paragon of virtue.他被认为是品德尽善尽美的典范。
• You need to decorate your mind with virtue.你应该用德行美化心灵。

6 veins   

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》

7 activation   

n. 激活，催化作用

参考例句：

• A computer controls the activation of an air bag.电脑控制着气囊的启动。

8 adherent   

n.信徒，追随者，拥护者

参考例句：

• He was most liberal where money would bring him a powerful or necessary political adherent.在金钱能够收买一个干练的或者必需的政治拥护者的地方，他是最不惜花钱的。
• He's a pious adherent of Buddhism.他是一位虔诚的佛教徒。

9 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。

10 predecessors   

n.前任( predecessor的名词复数 )；前辈；（被取代的）原有事物；前身

参考例句：

• The new government set about dismantling their predecessors' legislation. 新政府正着手废除其前任所制定的法律。 来自《简明英汉词典》
• Will new plan be any more acceptable than its predecessors? 新计划比原先的计划更能令人满意吗？ 来自《简明英汉词典》

11 retentive   

v.保留的，有记忆的；adv.有记性地，记性强地；n.保持力

参考例句：

• Luke had an amazingly retentive memory.卢克记忆力惊人。
• He is a scholar who has wide learning and a retentive memory.他是一位博闻强记的学者。

12 appreciation   

n.评价；欣赏；感谢；领会，理解；价格上涨

参考例句：

• I would like to express my appreciation and thanks to you all.我想对你们所有人表达我的感激和谢意。
• I'll be sending them a donation in appreciation of their help.我将送给他们一笔捐款以感谢他们的帮助。

13 demonstration   

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。

14 artistic   

adj.艺术(家)的，美术(家)的；善于艺术创作的

参考例句：

• The picture on this screen is a good artistic work.这屏风上的画是件很好的艺术品。
• These artistic handicrafts are very popular with foreign friends.外国朋友很喜欢这些美术工艺品。

15 solicitous   

adj.热切的，挂念的

参考例句：

• He was so solicitous of his guests.他对他的客人们非常关切。
• I am solicitous of his help.我渴得到他的帮助。