RECORD: Darwin, C. R. 1878.06.03-06. Drosera rotundifolia. CUL-DAR209.3.14. Edited by John van Wyhe (Darwin Online, http://darwin-online.org.uk/)

REVISION HISTORY: Transcribed by Christine Chua and edited by John van Wyhe 11.2022. RN1

NOTE: Reproduced with permission of the Syndics of Cambridge University Library and William Huxley Darwin. The volume CUL-DAR209.3 contains materials for Darwin's book Movement in plants (1880).


(1

1878

Drosera rotundifolia

On June 3d affixed glass-filament to back of oldish leaf; which stood obliquely & abruptly up; it circumnutated on a small scale as traced under Skylight on vertical glass —

next day (4th) it descended all day in a zig-zag line, so this movement which seem often or always to occur with the leaves as they grow old, seem modified circumnutation.

[in margin:] Epinasty

On June 5' put at 9° am a bits of meat on leaf, it continued to descend, zig-zagging considerably & making one loop & then ascended & continued to do so all the 6th. But I cannot trust these latter observations, as perhaps they were wholly due to the infolding of the distal end of leaf & which by 6° P.m has loosened the filament.

[in margin:] not to be trusted.


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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 13 December, 2022