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Letter 10938

Darwin, C. R. to Morse, E. S.

23 Apr 1877

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    Thanks for ESM's address ["What American zoologists have done for evolution", Proc. Am. Assoc. Adv. Sci. 25 (1876)].

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    J. A. Allen's work is important as apparently showing change through direct action of [external] conditions.

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    CD has given up trying to understand E. D. Cope and Alpheus Hyatt on acceleration and retardation.

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