RECORD: Darwin, C. R. [1878].04.21-.05.28. Cassia mimosoides. CUL-DAR209.1.26. (John van Wyhe ed., 2002-. The Complete Work of Charles Darwin Online, http://darwin-online.org.uk/)
REVISION HISTORY: Transcribed by Christine Chua and edited by John van Wyhe 6.2022. 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 volume CUL-DAR209.1 contains materials on circumnutation of leaves and sleep for Darwin's book Movement in plants (1880).
[26]
Cassia mimosoides
May 28 27' & 28 1878. young plant—
Leaflets certainly do not sink beneath main petiole but rotate so as to point to apex.
I believe main petiole was at 10° 30' P.m. 27° above horizon, & next morning at 10° 45' was 19° beneath horizon.
May 28th 10° 30' P.m. petiole was 27° above horizon & during day was beneath horizon.—
Petiole rose 8° at night
[diagram]
63 63
90 [-] 63 [=] 27
Citation: John van Wyhe, ed. 2002-. The Complete Work of Charles Darwin Online. (http://darwin-online.org.uk/)
File last updated 28 January, 2026