RECORD: Darwin, C. R. n.d. If all variations appear first generally not at earliest period of life. CUL-DAR205.6.27. Edited by John van Wyhe (Darwin Online, http://darwin-online.org.uk/)
REVISION HISTORY: Transcribed by Christine Chua and edited by John van Wyhe 11.2021. 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-DAR205.6 contains notes on embryology [pigeons].
The brown crayon number '12' indicates that this document was filed by Darwin in his portfolio for the subject of Embryology.
[27]
12
If all variations appear first generally not at earliest period of life, (though potentially cause present in genom) & if they reappear at nearly corresponding ages, then the grand fact of similarity of embryonic structure is explained. If the proportion absolute embryo wd seem identical, but no doubt some effect is produced in embryo. If many appeared early, then, embryo [more] affected.
Even direct causes of variation wd not affect embryo
Citation: John van Wyhe, ed. 2002-. The Complete Work of Charles Darwin Online. (http://darwin-online.org.uk/)
File last updated 16 October, 2023