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To A. R. Wallace   6 April [1868]

Summary

More on the "terrible problem" of natural selection and sterility. CD’s reasons for disagreeing with ARW. CD analyses and answers ARW in detail in defence of his conclusion that sterility cannot be increased through natural selection.

Author:  Charles Robert Darwin
Addressee:  Alfred Russel Wallace
Date:  6 Apr [1868]
Classmark:  The British Library (Add MS 46434: 125–9)
Letter no:  DCP-LETT-6095

From A. R. Wallace   8 [April] 1868

Summary

If CD is not convinced by his notes on sterility, ARW has little doubt that he is wrong. In fact he was only half-convinced by his own arguments.

Modifies his first proposition [a species varies occasionally in two directions, but owing to free inter-crossing the variations never increase] and further discusses the subject.

Encloses Berthold Seemann’s notes on flora of the Hawaiian Islands. Presence of European alpine species in Hawaiian volcanoes is a "hard nut" for geographical distribution [but see ARW’s Island life (1880), p. 323].

Author:  Alfred Russel Wallace
Addressee:  Charles Robert Darwin
Date:  8 [Apr] 1868
Classmark:  DAR 106: B57-8
Letter no:  DCP-LETT-6104

To A. R. Wallace   9 April [1868]

Summary

Warns ARW of dubious character of list of European alpine genera and species in volcanoes of Hawaii. Problems of geographical distribution in oceanic islands.

Author:  Charles Robert Darwin
Addressee:  Alfred Russel Wallace
Date:  9 Apr [1868]
Classmark:  The British Library (Add MS 46434)
Letter no:  DCP-LETT-6109

To A. R. Wallace   15 April [1868]

Summary

Admires ARW’s "Theory of birds’ nests" [J. Travel & Nat. Hist. 1 (1868): 73].

Discusses their respective views on birds’ nests, sexual selection, and protection.

Asks why, if brilliant colours of female butterflies are result of protective mimicry, do not males become equally brilliant? CD believes variation in females alone accounts for it, rather than protection.

Author:  Charles Robert Darwin
Addressee:  Alfred Russel Wallace
Date:  15 Apr [1868]
Classmark:  The British Library (Add MS 46434: 133–5)
Letter no:  DCP-LETT-6121

From A. R. Wallace   28 April [1868]

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Summary

Various topics related to sexual selection: sexual differences, sexual preferences, coloration.

Author:  Alfred Russel Wallace
Addressee:  Charles Robert Darwin
Date:  28 Apr [1868]
Classmark:  DAR 84.1: 120–4
Letter no:  DCP-LETT-6144

To A. R. Wallace   30 April [1868]

Summary

More on CD’s objections to ARW’s views on protection and natural selection.

Sexual selection.

Author:  Charles Robert Darwin
Addressee:  Alfred Russel Wallace
Date:  30 Apr [1868]
Classmark:  The British Library (Add MS 46434: 136–9)
Letter no:  DCP-LETT-6146
Document type
letter (6)
Addressee
Correspondent
Darwin, C. R. (6)
Wallace, A. R.[X]
Date
1868
04
06 (1)
08 (1)
09 (1)
15 (1)
28 (1)
30 (1)
letter