The Complete Work of Charles Darwin Online

RECORD: Darwin, C. R. 1867.05.17-06.28. Clarkia elegans. CUL-DAR79.110-111. Edited by John van Wyhe (Darwin Online, http://darwin-online.org.uk/)

REVISION HISTORY: Transcribed by Christine Chua and edited by John van Wyhe 3.2023. 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 volumes CUL-DAR 76-79 contain material for Darwin's book Cross and self fertilisation (1876).

(88

Clarkia elegans. 1867 — owing to wretched season hardly any seed set. (see former note on fertility).

12 flowers crossed yielded 4 pods with a good many seeds

18 self-fert. yielded only 1 pod, containing not above a fourth of seed of poorest crossed pod.

(May 17' In Pot I all the self after germinating & planted, died.)

(May 24th 68 — Plants 4—5 inches high crossed begin to show advantage.)

Plants now in full flower. (In both Pots selfs flowered first)

(June. 28'

[Table partly excised, not transcribed] Perhaps give in small type all such measurements in detail. N.B. There is an obvious reason that crossed shd ever be higher than self. Chance!

(All the crossed plants together produced 105 pods

[do] Self plants … … 63. pods.─)

[calculations not transcribed]

Citation: John van Wyhe, ed. 2002-. The Complete Work of Charles Darwin Online. (http://darwin-online.org.uk/)