RECORD: Darwin, C. R. [1878].09.18-21. Tropaeolum majus. CUL-DAR209.7.130. Edited by John van Wyhe (Darwin Online, http://darwin-online.org.uk/)

REVISION HISTORY: Transcribed by Christine Chua and edited by John van Wyhe 8.2022. 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-DAR209.7-8 contain notes on heliotropism (phototropism) for Darwin's book Movement in plants (1880).

[130]

Sept 18'—21' Tropæolum majus

I covered either the upper or lower side of 3 leaves on young plant with blackened paper or tin-foil — fastened on edges with little gum, & placed in Black box before before N.E. window, & the petioles bent perfectly & bent the leaves so as to face light. Sensitiveness seems to reside in Petioles, independently of Blade.

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

File last updated 25 September, 2022