RECORD: Darwin, C. R. n.d. Intercrossing plants. CUL-DAR76.B151. 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).
[151]
Intercrossing plants of the 7 s. fertilised generation (with Ipomœa & Mimulus) which which had been subjected to the same conditions, did not the least good to the offspring.
(over)
With Mimulus this was repeated tried on the next after 2 addition generations of s. fertilisaton; & now the intercross did do some good in height as 100: 85, & in fertility as 100: 65.
(Conclusion) very important
[151v]
Th With Escholtzia— a cross by a fresh stock increased greatly fertility over intercrossed for 2 generations & no doubt must have been for all previous generation — Brazil ─a ratio of 100: 45
Citation: John van Wyhe, ed. 2002-. The Complete Work of Charles Darwin Online. (http://darwin-online.org.uk/)
File last updated 1 June, 2023