RECORD: Darwin, C. R. n.d. Petunia / Plants of the same stock were intercrossed for 5 generations. CUL-DAR76.B153. Edited by John van Wyhe (Darwin Online, http://darwin-online.org.uk/)
REVISION HISTORY: Transcribed by Christine Chua and edited by John van Wyhe 12.2022. 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-DAR 76-79 contain material for Darwin's book Cross and self fertilisation (1876).
[153]
Petunia
Plants of the same stock were intercrossed for 5 generations, but these were exceeded in fertility by self-fertilised plants of the 4th generation (& one wd have thought that s. f. for 4 gen wd have been very injurious) when once crossed by fresh stock in the ratio of 54 to 100 (N. B)
Begin ch Plants s. f. for 4. gen. ( ) when by fresh stock exceeded in fertility intercrossed plant of 5 generations in ratio of 100 to 54. —
(again showing crossing by itself does nothing little.)
Citation: John van Wyhe, ed. 2002-. The Complete Work of Charles Darwin Online. (http://darwin-online.org.uk/)
File last updated 1 June, 2023