RECORD: Darwin, C. R. n.d. Heliotropism. CUL-DAR209.14.165. 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-DAR209.14 contains material for Darwin's book Movement in plants (1880).
[165]
Heliotropism
In all ordinary cases by movement of lea stems or hypocotyls— or the leaves or cotyledons therein they place themselves at rt. ∟ to light, but when sun shines very brightly some plants improperly called diurnal sleep place their leaves with edge in line, so as to be not to be scorched— Wiesner explains cause — see Pfeffer — also— for case & some seen by me. as— Oxalis slopes down Cohn & Averrhoa. — These latter probably for & adapted— From analogy modified circumnutation, but not carefully observed.—
Citation: John van Wyhe, ed. 2002-. The Complete Work of Charles Darwin Online. (http://darwin-online.org.uk/)
File last updated 18 August, 2023