Section IX Of the Reason of Animals

ALL our reasonings concerning matter of fact are founded on a species of Analogy, which leads us to expect from any cause the same events, which we have observed to result from similar causes. Where the causes are entirely¹ similar, the analogy is perfect, and the inference, drawn² from it, is regarded as certain and conclusive³: nor does any man ever entertain a doubt, where he sees a piece of iron, that it will have weight and cohesion⁴ of parts; as in all other instances, which have ever fallen under his observation. But where the objects have not so exact a similarity, the analogy is less perfect, and the inference is less conclusive; though still it has some force, in proportion to the degree of similarity and resemblance. The anatomical observations, formed upon one animal, are, by this species of reasoning, extended to all animals; and it is certain, that when the circulation of the blood, for instance, is clearly proved to have place in one creature, as a frog, or fish, it forms a strong presumption⁵, that the same principle has place in all. These analogical observations may be carried farther, even to this science, of which we are now treating; and any theory, by which we explain the operations of the understanding, or the origin and connexion of the passions in man, will acquire additional authority, if we find, that the same theory is requisite⁶ to explain the same phenomena⁷ in all other animals. We shall make trial of this, with regard to the hypothesis, by which we have, in the foregoing discourse⁸, endeavoured to account for all experimental reasonings; and it is hoped, that this new point of view will serve to confirm all our former observations.

First, It seems evident, that animals as well as men learn many things from experience, and infer, that the same events will always follow from the same causes. By this principle they become acquainted with the more obvious properties of external objects, and gradually, from their birth, treasure up a knowledge of the nature of fire, water, earth, stones, heights, depths, &c., and of the effects which result from their operation. The ignorance and inexperience of the young are here plainly distinguishable from the cunning and sagacity of the old, who have learned, by long observation, to avoid what hurt them, and to pursue what gave ease or pleasure. A horse, that has been accustomed to the field, becomes acquainted with the proper height which he can leap, and will never attempt what exceeds his force and ability. An old greyhound will trust the more fatiguing⁹ part of the chace to the younger, and will place himself so as to meet the hare in her doubles; nor are the conjectures¹⁰, which he forms on this occasion, founded in any thing but his observation and experience.

This is still more evident from the effects of discipline and education on animals, who, by the proper application of rewards and punishments, may be taught any course of action, and most contrary to their natural instincts and propensities¹¹. Is it not experience, which renders a dog apprehensive¹² of pain, when you menace him, or lift up the whip to beat him? Is it not even experience, which makes him answer to his name, and infer, from such an arbitrary sound, that you mean him rather than any of his fellows, and intend to call him, when you pronounce it in a certain manner, and with a certain tone and accent?

In all these cases, we may observe, that the animal infers some fact beyond what immediately strikes his senses; and that this inference is altogether founded on past experience, while the creature expects from the present object the same consequences, which it has always found in its observation to result from similar objects.

Secondly¹³, It is impossible, that this inference of the animal can be founded on any process of argument or reasoning, by which he concludes, that like events must follow like objects, and that the course of nature will always be regular in its operations. For if there be in reality any arguments of this nature, they surely lie too abstruse¹⁴ for the observation of such imperfect understandings; since it may well employ the utmost care and attention of a philosophic¹⁵ genius to discover and observe them. Animals, therefore are not guided in these inferences by reasoning: neither are children; neither are the generality of mankind, in their ordinary actions and conclusions: neither are philosophers themselves, who, in all the active parts of life, are, in the main, the same with the vulgar, and are governed by the same maxims¹⁶. Nature must have provided some other principle, of more ready, and more general use and application; nor can an operation of such immense consequence in life, as that of inferring effects from causes, be trusted to the uncertain process of reasoning and argumentation. Were this doubtful with regard to men, it seems to admit of no question with regard to the brute¹⁷ creation; and the conclusion being once firmly established in the one, we have a strong presumption, from all the rules of analogy, that it ought to be universally admitted, without any exception or reserve. It is custom alone, which engages animals, from every object, that strikes their senses, to infer its usual attendant, and carries their imagination, from the appearance of the one, to conceive the other, in that particular manner, which we denominate belief. No other explication can be given of this operation, in all the higher, as well as lower classes of sensitive beings, which fall under our notice and observation.19

But though animals learn many parts of their knowledge from observation, there are also many parts of it, which they derive¹⁸ from the original hand of nature; which much exceed the share of capacity they possess on ordinary occasions; and in which they improve, little or nothing, by the longest practice and experience. These we denominate Instincts, and are so apt to admire as something very extraordinary, and inexplicable¹⁹ by all the disquisitions of human understanding. But our wonder will, perhaps, cease or diminish, when we consider, that the experimental reasoning itself, which we possess in common with beasts, and on which the whole conduct of life depends, is nothing but a species of instinct or mechanical power, that acts in us unknown to ourselves; and in its chief operations, is not directed by any such relations or comparisons of ideas, as are the proper objects of our intellectual faculties²⁰. Though the instinct be different, yet still it is an instinct, which teaches a man to avoid the fire; as much as that, which teaches a bird, with such exactness, the art of incubation, and the whole economy and order of its nursery.

1 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。

2 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。

3 conclusive   

adj.最后的，结论的；确凿的，消除怀疑的

参考例句：

• They produced some fairly conclusive evidence.他们提供了一些相当确凿的证据。
• Franklin did not believe that the French tests were conclusive.富兰克林不相信这个法国人的实验是结论性的。

4 cohesion   

n.团结，凝结力

参考例句：

• I had to bring some cohesion into the company.我得使整个公司恢复凝聚力。
• The power of culture is deeply rooted in the vitality,creativity and cohesion of a nation. 文化的力量，深深熔铸在民族的生命力、创造力和凝聚力之中。

5 presumption   

n.推测，可能性，冒昧，放肆，[法律]推定

参考例句：

• Please pardon my presumption in writing to you.请原谅我很冒昧地写信给你。
• I don't think that's a false presumption.我认为那并不是错误的推测。

6 requisite   

adj.需要的，必不可少的；n.必需品

参考例句：

• He hasn't got the requisite qualifications for the job.他不具备这工作所需的资格。
• Food and air are requisite for life.食物和空气是生命的必需品。

7 phenomena   

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。

8 discourse   

n.论文，演说；谈话；话语；vi.讲述，著述

参考例句：

• We'll discourse on the subject tonight.我们今晚要谈论这个问题。
• He fell into discourse with the customers who were drinking at the counter.他和站在柜台旁的酒客谈了起来。

9 fatiguing   

a.使人劳累的

参考例句：

• He was fatiguing himself with his writing, no doubt. 想必他是拼命写作，写得精疲力尽了。
• Machines are much less fatiguing to your hands, arms, and back. 使用机器时，手、膊和后背不会感到太累。

10 conjectures   

推测，猜想( conjecture的名词复数 )

参考例句：

• That's weighing remote military conjectures against the certain deaths of innocent people. 那不过是牵强附会的军事假设，而现在的事实却是无辜者正在惨遭杀害，这怎能同日而语！
• I was right in my conjectures. 我所猜测的都应验了。

11 propensities   

n.倾向，习性( propensity的名词复数 )

参考例句：

• This paper regarded AFT as a criterion to estimate slagging propensities. 文中以灰熔点作为判断煤灰结渣倾向的标准。 来自互联网
• Our results demonstrate that different types of authoritarian regime face different propensities to develop toward democracy. 本文研究结果显示，不同的威权主义政体所面对的民主发展倾向是不同的。 来自互联网

12 apprehensive   

adj.担心的，恐惧的，善于领会的

参考例句：

• She was deeply apprehensive about her future.她对未来感到非常担心。
• He was rather apprehensive of failure.他相当害怕失败。

13 secondly   

adv.第二，其次

参考例句：

• Secondly,use your own head and present your point of view.第二，动脑筋提出自己的见解。
• Secondly it is necessary to define the applied load.其次，需要确定所作用的载荷。

14 abstruse   

adj.深奥的，难解的

参考例句：

• Einstein's theory of relativity is very abstruse.爱因斯坦的相对论非常难懂。
• The professor's lectures were so abstruse that students tended to avoid them.该教授的课程太深奥了，学生们纷纷躲避他的课。

15 philosophic   

adj.哲学的，贤明的

参考例句：

• It was a most philosophic and jesuitical motorman.这是个十分善辩且狡猾的司机。
• The Irish are a philosophic as well as a practical race.爱尔兰人是既重实际又善于思想的民族。

16 maxims   

n.格言，座右铭( maxim的名词复数 )

参考例句：

• Courts also draw freely on traditional maxims of construction. 法院也自由吸收传统的解释准则。 来自英汉非文学 - 行政法
• There are variant formulations of some of the maxims. 有些准则有多种表达方式。 来自辞典例句

17 brute   

n.野兽，兽性

参考例句：

• The aggressor troops are not many degrees removed from the brute.侵略军简直象一群野兽。
• That dog is a dangerous brute.It bites people.那条狗是危险的畜牲，它咬人。

18 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。

19 inexplicable   

adj.无法解释的，难理解的

参考例句：

• It is now inexplicable how that development was misinterpreted.当时对这一事态发展的错误理解究竟是怎么产生的，现在已经无法说清楚了。
• There are many things which are inexplicable by science.有很多事科学还无法解释。

20 faculties   

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》