RECORD: Darwin, C. R. [ny].03.18-21. Rubus Hybrid Idaeus / Draft of Cross and self fertilisation, folio 57. CUL-DAR209.11.105-106. Edited by John van Wyhe (Darwin Online, http://darwin-online.org.uk/)
REVISION HISTORY: Transcribed by Christine Chua and John van Wyhe 7.2023. 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-DAR209.11 contains material for Darwin's book Movement in plants (1880). Draft in the hand of Ebenezer Norman with corrections by Darwin. The text of the draft corresponds to Cross and self fertilisation, p. 33.
[105]
Rubus
Rubus Hybrid Idaeus
(Fig. 215)
(1/2 scale no lettering)
[106]
57
Ipomoea
house. I thought that the advantage thus given to the self-fertilised seedlings would have been so great that they self-fertilised seedlings would never have been beaten by the crossed ones. They were not beaten until all had grown to a height of 18 inches; and the degree to which they were finally beaten is shown in the following table No: 4.
We here see that the average height of the four crossed plants is 76.62, and of the four self-fertilised plants 65.87 inches, or as 100 to 86; and therefore less than when both sides started fair.
Table 4. (third generation,) the self-fertilised plants having had a start of 48 hours)
No. of Pot |
Crossed Plants |
Self-fertd. Plants |
III |
78 4/8 77 4/8 73 77 4/8 |
73 4/8 53 61 4/8 75 4/8 |
Total inches |
306 |
263 |
Citation: John van Wyhe, ed. 2002-. The Complete Work of Charles Darwin Online. (http://darwin-online.org.uk/)
File last updated 20 August, 2023