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To Alfred Russel Wallace   22 January 1866

Summary

Welcomes ARW’s paper on pigeons ["On the pigeons of the Malay Archipelago", Ibis 1 (1865): 365–400].

Influence of monkeys on distribution of pigeons and parrots.

Asks ARW to explain a passage in his paper on Malayan Papilionidae [Trans. Linn. Soc. Lond. 25 (1866): 1–71] on how dimorphic forms are produced. CD knows of varieties "that will not blend or intermix", but which produce offspring quite like either parent.

ARW’s remarks on geographical distribution in Celebes "will give a cold shudder to the immutable naturalists".

Presses ARW to work on his travel journal.

Author:  Charles Robert Darwin
Addressee:  Alfred Russel Wallace
Date:  22 Jan 1866
Classmark:  The British Library (Add 46434, f. 61)
Letter no:  DCP-LETT-4982

To A. R. Wallace   [6 February 1866]

Summary

ARW’s simple explanation of dimorphic forms is satisfactory.

On "non-blending" of certain varieties, CD thinks ARW has not understood him. He does not refer to fertility. He crossed two differently coloured varieties of peas and "got both varieties perfect, but none intermediate". Something like this must occur in ARW’s butterflies.

Author:  Charles Robert Darwin
Addressee:  Alfred Russel Wallace
Date:  [6 Feb 1866]
Classmark:  The British Library (Add 46434, f. 64)
Letter no:  DCP-LETT-4989

From A. R. Wallace   4 February 1866

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Summary

Looks forward to reading Variation.

Explains how two or more female forms occur in one species through selection. The physiological problem remains of how each produces offspring like the other without intermediates. Is not CD’s case of varieties that will not blend the physiological test of a species needed for "complete proof of the origin of species"?

"Travels" postponed.

Author:  Alfred Russel Wallace
Addressee:  Charles Robert Darwin
Date:  4 Feb 1866
Classmark:  DAR 106: B31–2
Letter no:  DCP-LETT-4997

From A. R. Wallace   2 July 1866

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Summary

Lengthy analysis of sources of misunderstanding of natural selection. Advocacy of Spencer’s term "survival of the fittest" instead of "Natural Selection". ARW urges CD to stress frequency of variations.

Author:  Alfred Russel Wallace
Addressee:  Charles Robert Darwin
Date:  2 July 1866
Classmark:  DAR 106: B33–8
Letter no:  DCP-LETT-5140

To A. R. Wallace   5 July [1866]

Summary

CD considers "the survival of the fittest" as alternative term to "Natural Selection". Reflections upon misunderstanding and his own ambiguity.

Health improved; can now work "some hours daily".

Author:  Charles Robert Darwin
Addressee:  Alfred Russel Wallace
Date:  5 July [1866]
Classmark:  The British Library (Add 46434, f.70)
Letter no:  DCP-LETT-5145

From A. R. Wallace   19 November 1866

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Summary

Thanks CD for 4th ed. of Origin.

Discusses abnormal sexual characters produced by mimicry. ARW’s papers on the subject.

Agassiz’s "marvellous" Amazonian glacier theory.

Author:  Alfred Russel Wallace
Addressee:  Charles Robert Darwin
Date:  19 Nov 1866
Classmark:  DAR 106: B39–40
Letter no:  DCP-LETT-5280

To A. R. Wallace   [23 November 1866?]

Summary

Will call on Wallace tomorrow (Saturday) at 10.

Author:  Charles Robert Darwin
Addressee:  Alfred Russel Wallace
Date:  [23 Nov 1866?]
Classmark:  Alexander Historical Auctions (dealers) (29 April 2000)
Letter no:  DCP-LETT-7512F
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