RECORD: Darwin, C. R. 1878.09.04-05. Apogeotropism — Oats. CUL-DAR209.11.9. Edited by John van Wyhe (Darwin Online, http://darwin-online.org.uk/)

REVISION HISTORY: Transcribed by Christine Chua and edited by John van Wyhe 7.2023. 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-DAR209.11 contains material for Darwin's book Movement in plants (1880).


[9]

Sept 4th - 5. 1878 Apogeotropism — Oats

Tall Cotyledons with leaves a little protruded— pot laid horizontally in dark at 8° 20' a.m. (4th) 9° 30' no effect

10° 15. tips turned up; 10° 55' tips much turned up also tips of the 2 with quills fastened by shell-lac & thread to bases.

2°. 30' tips now all pointed vertically up. (& & therefore nearly at right angle to basal part, but basal part very little bent except of very young ones.

[in margin:] (Clear tip first acted on by Apogeotropism.)

Sept 5th 9° a.m. The basal part of Cots now much curved up, with the exception of a very few seedlings in which still straight. One with quill with basal part straight, & this might have been one with no tendency in base to bend.— The other with gum quill driven into ground projecting .6 of inch & .1 of inch broad— shell-lacced whole length to cot. & tied with thread is considerably curved—

Remarkable evidence of strength.— It was so fixed as to bend from concave to convex side, not edgeways.—


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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 19 August, 2023