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To Louis Agassiz   19 August 1868


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

From Louis Agassiz   22 July 1868



LA clarifies his opposition to CD’s views, which does not blind him to the great value of CD’s original researches.

Answers CD’s questions regarding sexual coloration of Amazonian fishes and the protuberances on the head of male Geophagus and Cichla during the spawning season [see Descent, pp. 520, 529].

Author:  Jean Louis Rodolphe (Louis) Agassiz
Addressee:  Charles Robert Darwin
Date:  22 July 1868
Classmark:  DAR 82: B78–9
Letter no:  DCP-LETT-6286
Document type
letter (2)
Agassiz, Louis[X]
Darwin, C. R.[X]
07 (1)
08 (1)