RECORD: Darwin, C. R. 1878.04.04. Canary grass — Cotyledons Apogeotropism. CUL-DAR209.11.91. 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).
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Canary grass — Cotyledons. Apogeotropism
April 4th 1878. Glass filament affixed— pot laid horizontally [sketch] traced on vertical glass illuminated in front only when observations taken. Two seedlings young. —Began to rise at once. By 2° cotyledons very much curved upwards— First observation at 8°. 50 (ie in about 5°) — Apparently after 9° & 5° circumnutation was commencing.— Till then very little signs of do, for they rose up remarkably straight . By 5° P.m many of the seedlings parallel to surface of pot, so had curved up through 90' in 8° or less.
Citation: John van Wyhe, ed. 2002-. The Complete Work of Charles Darwin Online. (http://darwin-online.org.uk/)
File last updated 19 August, 2023