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From G. H. K. Thwaites   22 July 1868

Summary

GHKT is going to procure some local smoke-coloured fowls and investigate them for CD.

Encloses letter on expression queries from S. O. Glenie.

Author:  George Henry Kendrick Thwaites
Addressee:  Charles Robert Darwin
Date:  22 July 1868
Classmark:  DAR 178: 124; DAR 165: 53
Letter no:  DCP-LETT-6285

From Louis Agassiz   22 July 1868

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Summary

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