RECORD: Darwin, C. R. n.d. Young Plant ─ Pot 3 / Draft of Movement in plants. CUL-DAR209.7.63. 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).


[63]

Bis

Young Plant— Pot 3

11° 46' to light

1° 4' from light = moving from light 78 m

2° 29' to light = 85 m.

[63v]

561

sleeping plant, a like part of an ellipse described in the evening would have to be greatly incurved in size, length until the leaf stood sleeping plant, the leaf would have to move in the evening & on to fully swing to a greater extent than at other times, & would than describe a very large ellipse.

sleeping plant, one side of which that are ellipses which if each the leaves a leaf was [illeg] forming in the evening in the evening would have to be growing growing incurved in length in the evening & the side of another ellipse on the [illeg] so that until the leaf stood vertically; & close to one to fully moving to side of another ellipse wd have to be similarly incurved in length so as to bring the leaf into its diurnal position; when

[Movement in plants, pp. 410-11: "But the leaves and cotyledons of many non-sleeping plants move in a much more complex manner than in the cases just alluded to, for they describe two, three, or more ellipses in the course of a day. Now, if a plant of this kind were converted into one that slept, one side of one of the several ellipses which each leaf daily describes, would have to be greatly increased in length in the evening, until the leaf stood vertically, when it would go on circumnutating about the same spot. On the following morning, the side of another ellipse would have to be similarly increased in length so as to bring the leaf back again into its diurnal position, when it would again circumnutate until the evening."]


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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