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To A. R. Wallace   19 August [1868]

Summary

The problem of dimorphic plants and their fertility.

Author:  Charles Robert Darwin
Addressee:  Alfred Russel Wallace
Date:  19 Aug [1868]
Classmark:  The British Library (Add MS 46434: 143–6)
Letter no:  DCP-LETT-6322

To Louis Agassiz   19 August 1868

Summary

Thanks LA for information on sexual differences in the coloration of Amazonian fish. CD was anxious to know how the sexes differed because they are unusual in that the male has the largest share in looking after ova and young.

Author:  Charles Robert Darwin
Addressee:  Jean Louis Rodolphe (Louis) Agassiz
Date:  19 Aug 1868
Classmark:  Houghton Library, Harvard University (MS Am 1419: 278)
Letter no:  DCP-LETT-6323

To J. D. Hooker   19 August 1868

Summary

Asks JDH to obtain from Sven Nilsson information on whether, in reindeer species in which both sexes are horned, the horns are first developed earlier or later than in species in which males alone have horns.

Author:  Charles Robert Darwin
Addressee:  Joseph Dalton Hooker
Date:  19 Aug 1868
Classmark:  Lund University Library Special Collections (Sven Nilsson papers)
Letter no:  DCP-LETT-6324

From W. S. Dallas   19 August 1868

Summary

The material [from F. Müller] makes the translation more like a new edition.

German entomologists are becoming Darwinists.

Author:  William Sweetland Dallas
Addressee:  Charles Robert Darwin
Date:  19 Aug 1868
Classmark:  DAR 162: 22
Letter no:  DCP-LETT-6325
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