RECORD: Darwin, C. R. n.d. When I speak of fertility of Dom. animals. CUL-DAR193.19. Edited by John van Wyhe (Darwin Online,

REVISION HISTORY: Transcribed by Christine Chua and edited by John van Wyhe 8.2022. RN1

NOTE: See record in the Darwin Online manuscript catalogue, enter its Identifier here. Reproduced with permission of the Syndics of Cambridge University Library and William Huxley Darwin. The volume CUL-DAR193 contains notes for Darwin's book Variation under domestication (1865-75).


In 2d vol. when I speak of fertility of Dom. animals, or under sterility when I speak of excess of food — admit freely that if you overfed an female animal at a the period of pregnancy she will fail to produce young — this seems fairly well established with dogs & pigs — so if you overwork Dogs — Bitches.—

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Citation: John van Wyhe, ed. 2002-. The Complete Work of Charles Darwin Online. (

File last updated 25 September, 2022