Letter 10938
Darwin, C. R. to Morse, E. S.
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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.