RECORD: Darwin, C. R. 1878.06.03 Verbena herbaceous scarlet-flowered Var Apogeotropism. CUL-DAR209.11.113. 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).


[113]

Verbena herbaceous scarlet-flowered Var

Apogeotropism.

Stem 8 inches high, quite straight, pot laid horizontally, kept in darkness— traced on vertical glass [sketch]

glass Jun 3d Pot laid down at 9° 50' a.m by 10° 55' had fallen a little: by 12° 10' had risen considerably & by 4° 45' 7° had risen so much that cd no longer be traced on vertical glass.

At end of observation ie after 2 or 3 days the terminal l 1 1/2 inch of this shoot & of all others found bent up rectangularly; So strongly & quickly geotropic: the long line traced was almost absolutely straight. At 5° P.m. A mark placed behind, & stem from some unknown cause bent to one side, but still continued rising & now zig-zagged somewhat. On next day June 4th & following days regularly circumnutated; & movements are was is carefully described & traced under head of Circumnutation of stem of plants, not seedlings.

It is clear that for a time apogeotropism Conquered circumnutation — (no tracing given)


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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 20 August, 2023