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Darwin Correspondence Project
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1868::04::15 in date [X]
1868::04::15 in date [X]
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To H. W. Bates   15 April [1868]

Summary

CD has questions related to colour differences in the sexes of butterflies, especially in relation to HWB’s paper ["On variation in sexes of Argynnis diana", Proc. Entomol. Soc. Philadelphia 4 (1865): 204–7].

Mentions that his MS on Lepidoptera [for Descent] is longer than he intended and the information is four-fifths owed to HWB.

Author:  Charles Robert Darwin
Addressee:  Henry Walter Bates
Date:  15 Apr [1868]
Classmark:  Cleveland Health Sciences Library (Robert M. Stecher collection)
Letter no:  DCP-LETT-6120

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:  British Library (Add 46434: 133–5)
Letter no:  DCP-LETT-6121

From W. E. Darwin   [15 April 1868]

Summary

Gives details of the subjects on whom Langstaff made his observations on crying. Langstaff has not seen the platysma contract under chloroform.

Author:  William Erasmus Darwin
Addressee:  Charles Robert Darwin
Date:  [15 Apr 1868]
Classmark:  DAR 162: 84
Letter no:  DCP-LETT-6122

To Henry Doubleday   15 April [1868]

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Summary

Submits lists of insects [missing] for correspondent to check whether brightly coloured. Wants to determine whether there is any relation between bright colouring, whether in both sexes or one alone, and an unequal number of males and females.

Author:  Charles Robert Darwin
Addressee:  Henry Doubleday
Date:  15 Apr [1868]
Classmark:  DAR 82: 121-2
Letter no:  DCP-LETT-6123