The Complete Work of Charles Darwin Online

RECORD: Darwin, C. R. n.d. The irritation probably travels more quickly. CUL-DAR209.15.64. Edited by John van Wyhe (Darwin Online, http://darwin-online.org.uk/)

REVISION HISTORY: Transcribed by Christine Chua and edited by John van Wyhe 5.2023. 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 volume CUL-DAR209.15 contains notes and photographs for Darwin's book Movement in plants (1880).

~~leaf.~~ The irritation probably travels more quickly or powerfully from the glands in the centre of the leaf, than from those of the circum~~fential~~ ference hairs.)

(Three flies moistened & stuck on the smooth backs of ~~the~~ leaves, care being taken X —

Note on back or base of

(Old Perfect M.S)

[9v]

(B) Dr Nitschke, however, states that irritation at the back of the leaf causes the hairs to bend backwards; I have not observed this, though I have tried repeatedly by scrubbing — I have never seen a trace of backward movement.

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