RECORD: Darwin, C. R. [1878].06.18. Acanthus spinosus [with diagrams] / Draft of Cross and self fertilisation. CUL-DAR209.3.67. Edited by John van Wyhe (Darwin Online, http://darwin-online.org.uk/)
REVISION HISTORY: Transcribed by Christine Chua and edited by John van Wyhe 11.2022. RN1
NOTE: Reproduced with permission of the Syndics of Cambridge University Library and William Huxley Darwin. The volume CUL-DAR209.3 contains materials for Darwin's book Movement in plants (1880).
Draft is in the hand of Ebenezer Norman with corrections by Darwin. The text of the draft corresponds to Cross and self fertilisation, p. 368.
[67]
Acanthus spinosus Jun 18' 11˚15
[2 figures]
[67v]
29 640
Chap. E 10
Medicago lupulina (do). On account of the danger of losing the seeds, I was forced to gather the pods before they were quite ripe; 150 flower-heads on plants visited by bees yielded pods weighing 101 grains; whilst 150 heads on protected plants yielded pods weighing 77 grains. The inequality would probably have been greater if the mature seeds could have been all safely collected and compared. Jg. Urban (Keimung Bluthen &c bei Medicago, 1873) has described the means of fertilisation in this genus, as has the Revd G. Henslow in the Journal of Linn. Socty, Bot. Vol IX, 1866, p. 327 and 355.
Nicotiana tabacum (Solanaceæ) fully self-fertile.
Ipomoea purpurea (Convolvulaceæ) highly self-fertile.
Leptosiphon androsaceus (Polemoniaceæ). plants under a net produced a good many capsules.
Nolana prostrata (Nolanaceæ), covered up plants in the greenhouse yielded seeds by weight compared with uncovered plants, the flowers of which were visited by many bees,
Citation: John van Wyhe, ed. 2002-. The Complete Work of Charles Darwin Online. (http://darwin-online.org.uk/)
File last updated 21 January, 2023