RECORD: Darwin, C. R. [1879].06.09. Ivy Seedlings [Hedera helix]. CUL-DAR209.7.52. 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).
[52]
June 9th. Ju Ivy Seedlings Light
Pot with seedling exposed during 2 very cloudy & rainy days in blackened box before S.W. window. Hypocotyl only slightly curved to light; but to day some little sun & Hycotyl (& cotyledons themselves) distinctly curved to light. Therefore stem, as Sachs says Heliotropic, when (though very slightly compared with many plants) whole stem when few inches long distinct a far more strongly apheliotropic.—
Tropaeolum I suppose is analogous case
Citation: John van Wyhe, ed. 2002-. The Complete Work of Charles Darwin Online. (http://darwin-online.org.uk/)
File last updated 25 September, 2022