Part 1 Chapter 4 Scepticism of the Instrument

At first I took the world of fact as being exactly as I perceived it. I believed my eyes. Seeing was believing, I thought. Still more did I believe my reasoning. It was only slowly that I began to suspect that the world of fact could be anything different from the clear picture it made upon my mind.

I realised the inadequacy¹ of the senses first. Into that I will not enter here. Any proper text book of physiology² or psychology³ will supply a number of instances of the habitual⁴ deceptions⁵ of sight and touch and hearing. I came upon these things in my reading, in the laboratory, with microscope or telescope, lived with them as constant difficulties. I will only instance one trifling⁷ case of visual deception⁶ in order to lead to my next question. One draws two lines strictly⁸ parallel; so

(two horizontal and parallel lines.)

Oblique⁹ to them one draws a series of lines; so

(a series of parallel and closely-spaced lines drawn¹⁰ through each horizontal line, one series (top) sloping to the right, the other (bottom) to the left)

and instantly the parallelism seems to be disturbed. If the second figure is presented to any one without sufficient science to understand this delusion¹¹, the impression is created that these lines converge¹² to the right and diverge¹³ to the left. The vision is deceived in its mental factor and judges wrongly of the thing seen.

In this case we are able to measure the distance of the lines, to find how the main lines looked before the cross ones were drawn, to bring the deception up against fact of a different sort and so correct the mistake. If the ignorant observer were unable to do that, he might remain permanently¹⁴ under the impression that the main lines were out of parallelism. And all the infirmities of eye and ear, touch and taste, are discovered and checked by the fact that the erroneous impressions presently strike against fact and discover an incompatibility¹⁵ with it. If they did not we should never have discovered them. If on the other hand they are so incompatible¹⁶ with fact as to endanger the lives of the beings labouring under such infirmities, they would tend to be eliminated from among our defects.

The presumption¹⁷ to which biological science brings one is that the senses and mind will work as well as the survival of the species may require, but that they will not work so very much better. There is no ground in matter-of-fact experience for assuming that there is any more inevitable¹⁸ certitude about purely¹⁹ intellectual operations than there is about sensory²⁰ perceptions. The mind of a man may be primarily only a food-seeking, danger-avoiding, mate-finding instrument, just as the mind of a dog is, just as the nose of a dog is, or the snout of a pig.

You see the strong preparatory reason there is in this view of life for entertaining the suppositions that:—

The senses seem surer than they are.

The thinking mind seems clearer than it is and is more positive than it ought to be.

The world of fact is not what it appears to be.

1 inadequacy   

n.无法胜任，信心不足

参考例句：

• the inadequacy of our resources 我们的资源的贫乏
• The failure is due to the inadequacy of preparations. 这次失败是由于准备不足造成的。

2 physiology   

n.生理学，生理机能

参考例句：

• He bought a book about physiology.他买了一本生理学方面的书。
• He was awarded the Nobel Prize for achievements in physiology.他因生理学方面的建树而被授予诺贝尔奖。

3 psychology   

n.心理，心理学，心理状态

参考例句：

• She has a background in child psychology.她受过儿童心理学的教育。
• He studied philosophy and psychology at Cambridge.他在剑桥大学学习哲学和心理学。

4 habitual   

adj.习惯性的；通常的，惯常的

参考例句：

• He is a habitual criminal.他是一个惯犯。
• They are habitual visitors to our house.他们是我家的常客。

5 deceptions   

欺骗( deception的名词复数 )； 骗术，诡计

参考例句：

• Nobody saw through Mary's deceptions. 无人看透玛丽的诡计。
• There was for him only one trustworthy road through deceptions and mirages. 对他来说只有一条可靠的路能避开幻想和错觉。

6 deception   

n.欺骗，欺诈；骗局，诡计

参考例句：

• He admitted conspiring to obtain property by deception.他承认曾与人合谋骗取财产。
• He was jailed for two years for fraud and deception.他因为诈骗和欺诈入狱服刑两年。

7 trifling   

adj.微不足道的；没什么价值的

参考例句：

• They quarreled over a trifling matter.他们为这种微不足道的事情争吵。
• So far Europe has no doubt, gained a real conveniency,though surely a very trifling one.直到现在为止,欧洲无疑地已经获得了实在的便利，不过那确是一种微不足道的便利。

8 strictly   

adv.严厉地，严格地；严密地

参考例句：

• His doctor is dieting him strictly.他的医生严格规定他的饮食。
• The guests were seated strictly in order of precedence.客人严格按照地位高低就座。

9 oblique   

adj.斜的，倾斜的，无诚意的，不坦率的

参考例句：

• He made oblique references to her lack of experience.他拐弯抹角地说她缺乏经验。
• She gave an oblique look to one side.她向旁边斜看了一眼。

10 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。

11 delusion   

n.谬见，欺骗，幻觉，迷惑

参考例句：

• He is under the delusion that he is Napoleon.他患了妄想症，认为自己是拿破仑。
• I was under the delusion that he intended to marry me.我误认为他要娶我。

12 converge   

vi.会合；聚集，集中；(思想、观点等)趋近

参考例句：

• The results converge towards this truth.其结果趋近于这个真理。
• Parallel lines converge at infinity.平行线永不相交。

13 diverge   

v.分叉，分歧，离题，使...岔开，使转向

参考例句：

• This is where our opinions diverge from each other.这就是我们意见产生分歧之处。
• Don't diverge in your speech.发言不要离题。

14 permanently   

adv.永恒地，永久地，固定不变地

参考例句：

• The accident left him permanently scarred.那次事故给他留下了永久的伤疤。
• 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。

15 incompatibility   

n.不兼容

参考例句：

• One cause may be an Rh incompatibility causing kernicterus in the newborn. 一个原因可能是Rh因子不相配引起新生儿的脑核性黄疸。
• Sexual incompatibility is wide-spread in the apple. 性的不亲合性在苹果中很普遍。

16 incompatible   

adj.不相容的，不协调的，不相配的

参考例句：

• His plan is incompatible with my intent.他的计划与我的意图不相符。
• Speed and safety are not necessarily incompatible.速度和安全未必不相容。

17 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。

18 inevitable   

adj.不可避免的，必然发生的

参考例句：

• Mary was wearing her inevitable large hat.玛丽戴着她总是戴的那顶大帽子。
• The defeat had inevitable consequences for British policy.战败对英国政策不可避免地产生了影响。

19 purely   

adv.纯粹地，完全地

参考例句：

• I helped him purely and simply out of friendship.我帮他纯粹是出于友情。
• This disproves the theory that children are purely imitative.这证明认为儿童只会单纯地模仿的理论是站不住脚的。

20 sensory   

adj.知觉的，感觉的，知觉器官的

参考例句：

• Human powers of sensory discrimination are limited.人类感官分辨能力有限。
• The sensory system may undergo long-term adaptation in alien environments.感觉系统对陌生的环境可能经过长时期才能适应。