RECORD: Darwin, C. R. [ny].06.03-07. Cyperus alternifolius. CUL-DAR209.11.43. 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).
[43]
Cyperus alternifolius. (before observed)
(Apogeotropism)
June 3d to 7th Young stem only 5 1/2 high, but leaves fully expanded, laid horizontally, & Kept in darkness & movement traced on vertical glass. [sketch]
End of stem 6 1/2 inches from glass. —
See Tracing— Laid down 10° a.m on Jun 3d, at first fell an atom — next day did not rise. On 5th began to rise though very slightly & so continued till Jun 7' 11° — Course slightly zig zag. The chief point of bending was near base & at close of observation was turned upwards only 11°. Wonderfully little & slowly apogeotropic considering observed from morning of 3d to 7th. ie 4 days
Citation: John van Wyhe, ed. 2002-. The Complete Work of Charles Darwin Online. (http://darwin-online.org.uk/)
File last updated 19 August, 2023