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From:
Charles Robert Darwin
To:
Alfred Russel Wallace
Date:
[21 Mar 1868]
Source of text:
The British Library (Add MS 46434: 119–20); DAR 106: B160–3
Summary:

On problem of sterility, CD cannot persuade himself that it has been gained by natural selection.

On sexual selection and minute variations, he tends to agree with ARW. Sends George Darwin’s notes on ARW’s argument.

Contributor:
Darwin Correspondence Project
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From:
Charles Robert Darwin
To:
Alfred Russel Wallace
Date:
14 Apr 1869
Source of text:
The British Library (Add MS 46434: 181–3)
Summary:

ARW’s review of 10th ed. of Lyell’s Principles [see 6684] is admirable.

But he differs "grievously" with ARW on man. CD sees no necessity for an additional and proximate cause.

Contributor:
Darwin Correspondence Project
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From:
Charles Robert Darwin
To:
Alfred Russel Wallace
Date:
25 June [1869]
Source of text:
The British Library (Add MS 46434: 186–7); Natural History Museum (Entomology Manuscripts MSS WAL A 1:1 (127-128))
Summary:

On butterfly scales: there are many secondary characters which baffle conjecture.

Was forced to make additions to Origin as short as possible.

Contributor:
Darwin Correspondence Project
From:
Charles Robert Darwin
To:
Alfred Russel Wallace
Date:
21 Oct 1869
Source of text:
The British Library (Add MS 46434: 189–90); Linnean Society of London (Quentin Keynes Collection)
Summary:

Anticipates that all their differences are fated to find expression in projected book on man.

Offers his early MS with useful references related to the distribution of animals. Hopes ARW’s book will not be "little".

Contributor:
Darwin Correspondence Project