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Darwin, C. R. in correspondent 
Nicols, Arthur in correspondent 
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From:
Charles Robert Darwin
To:
Robert Arthur (Arthur) Nicols
Date:
[before 10 Nov 1875]
Source of text:
Nature , 20 February 1879, p. 365
Summary:

Does not doubt animals reason in a practical fashion. Do not the rats hear the water trickling?

Contributor:
Darwin Correspondence Project
From:
Robert Arthur (Arthur) Nicols
To:
Charles Robert Darwin
Date:
[before 10 Nov 1875]
Source of text:
DAR 172: 62
Summary:

Discusses his ambitions.

Writes of rats that gnaw through lead pipes to find water.

Contributor:
Darwin Correspondence Project
From:
Robert Arthur (Arthur) Nicols
To:
Charles Robert Darwin
Date:
10 Nov 1875
Source of text:
DAR 172: 63
Summary:

Apologises for troubling CD to look for his lost MS.

Contributor:
Darwin Correspondence Project
From:
Robert Arthur (Arthur) Nicols
To:
Charles Robert Darwin
Date:
8 Dec 1875
Source of text:
DAR 172: 64
Summary:

He will repeat his experiments on the cat’s sense of smell.

The intelligence of rats is shown by their gnawing through lead pipes to find water.

Contributor:
Darwin Correspondence Project