The Complete Work of Charles Darwin Online

RECORD: Darwin, C. R. 1878.11.08. Dionaea. CUL-DAR209.3.166. 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).

[166]

Nov 8th 1878

Dionæa

Pfeffer quotes Meyer that lobes rise at night. Accordingly I fixed long glass-filament exteriorly to lobes of 3 fine leaves of different ages & measured distance at 2° 50' P.m. — In 2 cases the distance was 1.6 of inch; in 3d case 1. inch—As leaves ~~do not~~ never fully expand, the glass-filaments of course diverge much, & this accounts for distance of tips apart.— At 10° 15' P.m— distance again carefully measured, & in all 3 case exactly the same as before; leaves certainly do not close.

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