RECORD: Darwin, C. R. 1869.08.07. The speculum in young full-grown ducks is not well pronounced. CUL-DAR85.B96. Edited by John van Wyhe (Darwin Online, http://darwin-online.org.uk/)
REVISION HISTORY: Transcribed by Christine Chua and edited by John van Wyhe 3.2022. 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 volumes CUL-DAR80-86 contain material for Darwin's book Descent of man (1871).
Darwin cited this in Descent 1: 291.
[B96]
Aug 7 /69/ The speculum in young full-grown ducks is not well pronounced & seems considerably [illeg] in ♂ than ♀, but I had not good vars to observe - no trace in ♂ of curled tail-feathers - speculum certainly appears before the curled tail-feathers in ♂.
Citation: John van Wyhe, ed. 2002-. The Complete Work of Charles Darwin Online. (http://darwin-online.org.uk/)
File last updated 25 September, 2022