RECORD: Darwin, C. R. 1878.09.17. Drosera rotundifolia. CUL-DAR209.3.182. Edited by John van Wyhe (Darwin Online, http://darwin-online.org.uk/)
REVISION HISTORY: Transcribed by Christine Chua and edited by John van Wyhe 12.2022. 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-DAR209.3 contains materials for Darwin's book Movement in plants (1880).
[182]
Drosera rotundifolia
Sept 17— 1878 — Young leaf .22 in transverse diameter not including tentacles, with inner tentacles not fully expanded, observed as before under compound — The tentacle moved steadily backwards or outwards, crossing division of micrometer at rate of 1/500 of inch in 20' or 1/100 in 100'— There was also some lateral movement [illeg] to one or 2 1/500 of inch, so I suppose modified circumnutation on a very small scale.— I know old tentacles bend outwards — gland sensitive, for I put drop for about 10" of Saliva hanging to handle over gland, & in 40" from first application began curling inwards. —
[in margin:] Back of Leaf firmly secured to stick
Citation: John van Wyhe, ed. 2002-. The Complete Work of Charles Darwin Online. (http://darwin-online.org.uk/)
File last updated 14 December, 2022