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Letter 9991

Darwin, C. R. to Dohrn, F. A.

24 May 1875

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    Thanks AD for his Ursprung [der Wirbelthiere (1875)], which astonished CD. AD's views, if accepted by competent authorities, will show how much we have to learn about the history of every animal. Suggests caution on "degradation principle". Comments on other views in the work. Has long seen importance of the principle of "Functionswechsel" [transfer [change!?] of function], but never enunciated it as a distinct principle.

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