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1870-1879 in date 
Grove, W. R. in correspondent 
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From:
William Robert Grove
To:
Charles Lyell, 1st baronet
Date:
2 July 1871
Source of text:
DAR 165: 235
Summary:

Asks Lyell to put a question to CD: "To what far distant origin can the configuration of the skin surface [the symmetrical but different curves] at the last points of the fingers and toes be traced?"

Contributor:
Darwin Correspondence Project
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From:
Charles Robert Darwin
To:
William Robert Grove
Date:
4 July [1871]
Source of text:
Royal Institution of Great Britain (Grove Papers)
Summary:

Has never before noticed with care the markings on finger-ends. Compares them to the complex whirl-pool patterns of human foetal lanugo.

Contributor:
Darwin Correspondence Project
From:
William Robert Grove
To:
Charles Robert Darwin
Date:
[5–8 July 1871]
Source of text:
DAR 87: 190–2
Summary:

Mammae in human males.

The role of natural selection in the development of beards and manes of animals.

Hereditary pointing in setters.

Contributor:
Darwin Correspondence Project
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From:
Charles Robert Darwin
To:
William Robert Grove
Date:
9 July [1871]
Source of text:
Royal Institution of Great Britain (Grove Papers)
Summary:

Does not think WRG’s theory [about ridges of skin on palm and finger-ends?] will hold.

Does not believe the beard in monkeys and goats could be protective like the lion’s mane.

Thanks him for fact about setters.

Is perplexed about the reported milk secretion in pubescent boys.

Contributor:
Darwin Correspondence Project