RECORD: Darwin, C. R. & Emma Darwin. [1870-1871]. Draft of Descent, vol. 1. CUL-DAR68. 101r. Edited by John van Wyhe (Darwin Online, http://darwin-online.org.uk/)
REVISION HISTORY: Transcribed by Christine Chua and edited by John van Wyhe 4.2023. 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-DAR68 contains notes on 'bloom'. Francis Darwin explained: "His researches into the meaning of the 'bloom,' or waxy coating found on many leaves, was one of those inquiries which remained unfinished at the time of his death. He amassed a quantity of notes on the subject". LL3: 339. See an Introduction to these folders by Christine Chua & John van Wyhe.
The text of the draft corresponds to Descent 1: 223.
[101r]
There is even a higher grade of [text excised]
Both Gärtner & Kölreuter have found that in genera of plants including numerous species, a series can be formed of from species which yield when crossed fewer & fewer seeds, & at last to species which never produce a single seed, but yet are affected by the pollen of the other species, for the germen swells. It is here manifestly impossible to select the more sterile individuals, which have already ceased when crossed to yield a single seeds, so that the acme of sterility, when the germen alone is affected, should be gained through selection. This acme, & no doubt the other grades of sterility,
Citation: John van Wyhe, ed. 2002-. The Complete Work of Charles Darwin Online. (http://darwin-online.org.uk/)
File last updated 13 July, 2023