RECORD: Darwin, C. R. n.d. Ch XI p 1 / We have been informed by Prof. Sachs. CUL-DAR209.7.142. Edited by John van Wyhe (Darwin Online,

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).


Ch XI p 1

* We have been informed by Prof. Sachs that this is the case: he has calculated that the tip upper part of the cotyledon of Avena sativa could manufacture in the course of a day at most only 6/1000 of a milligram (ie 1/70th of a grain) of dry starch!

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Citation: John van Wyhe, ed. 2002-. The Complete Work of Charles Darwin Online. (

File last updated 25 September, 2022