The Complete Work of Charles Darwin Online

RECORD: Darwin, C. R. 1873.08.02-03. Dionaea. CUL-DAR59.1.3. Edited by John van Wyhe (Darwin Online, http://darwin-online.org.uk/)

REVISION HISTORY: Transcribed by Christine Chua and edited by John van Wyhe 10.2022. 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 volumes CUL-DAR 54-61 contain material for Darwin's book Insectivorous plants (1875).

Dionaea muscipula is the Venus flytrap. These notes are for Darwin, C. R. 1875. Insectivorous plants. London: John Murray. (F1217)

Dionæa

Aug. 2d /73/

Several days ago Horace burnt gl filaments so that several holes were formed at base & leaf did not close, but after a time closed very slowly when I touched filament it only increased slightly rate of closure. — Some time afterward it reopened & was fairly sensitive.

To day I burnt with lens 2 filaments, so that their bases were scorched, even as seen on under side of leaf.— No movement — I then touched filaments on opposite lobe & leaf closed, but rather slowly.

{Aug 3' leaf has partly opened & closed when filament touched

Aug 3d Blew violently through fine pipe with nozzle close to filaments caused no inflection — Also dropped water in little broken stream on them & no inflection.

Then touched filaments & leaf closed well.—

(First give all causes which excite & then those that do not excite filaments

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