The Complete Work of Charles Darwin Online

RECORD: Darwin, C. R. [1874].07.06-08. Dionaea / Proof sheet of Expression, Chapter 9, p. 131. CUL-DAR57.110. Edited by John van Wyhe (Darwin Online, http://darwin-online.org.uk/)

REVISION HISTORY: Transcribed by Christine Chua and edited by John van Wyhe 1.2023. 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 volumes CUL-DAR 54-61 contain material for Darwin's book Insectivorous plants (1875).

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July 6th 9°. Dionæa

Leaf immersed in water at 75° instantly shut up

2d leaf immersed in water at 62° 1/2 instantly shut up!!!

These cut off leaves were placed in water & 7th 7° 40' they had partially opened when touched with needle one shut again — Can cutting off leaf make extra sensitive the water by disturbing electrical current—

(Immerse leaf whilst still attached to plant.)

July 8' 8° Am. Both leaves 1/2 open, both when touched closed pretty quickly

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[Proof sheet with corrections of Expression, p. 131.]

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