RECORD: Darwin, C. R. n.d. Trifolium subterraneum— Geotropism. CUL-DAR209.11.251. Edited by John van Wyhe (Darwin Online, http://darwin-online.org.uk/)
REVISION HISTORY: Transcribed by Christine Chua and edited by 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).
[251]
Ap. 20th 80/ Trifolium subterraneum— Geotropism.
Thread were tied on 19 flowers, all placed on upright & trailing branches & all directed vertically upwards in the complete darkness in greenhouse & after 24 hr of these 6 had become about quite or almost vertically down & had moved 180° — so were nearly horizontal & so had had moved about 90°, & 1 was declined about 45° from the vertical & 2 alone were still vertical. After additional 24h the 45° was almost vertical & the 2 other declined beneath horizon; these 3 flower-Heads were young ones ↘
[251v]
It is clear are geotropic. & very strongly so as several moved down 180° in 24hr.—
Citation: John van Wyhe, ed. 2002-. The Complete Work of Charles Darwin Online. (http://darwin-online.org.uk/)
File last updated 23 August, 2023