RECORD: Darwin, C. R. & Francis Darwin. [ny].10.26.29. Helianthus annuus. CUL-DAR209.4.173. Edited by John van Wyhe (Darwin Online, http://darwin-online.org.uk/)

REVISION HISTORY: Transcribed by Christine Chua and edited by John van Wyhe 9.2022. 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-DAR209.4 contains materials for Darwin's book Movement in plants (1880).

[173]

Oct 27 Helianthus annuus

Hot-house: filament fastened to one cotyledon & the other pinned. Vertical glass: Brown paper cylinder & white paper lid on top. Magnifying about 20 times

On Oct 26th I say that next morning the gum with which the filament had been fastened was loose: therefore I have no doubt that this n filament was fixed on better but I do not say how.

I have not joined the days together because it would confuse it more

The trace movement is very irregular because 10 AM, 28th the dot is much higher than on preceding night whereas on 29th 9. 8 AM it is lower than preceding night.

The two dots on 29th between 9. 8 AM. & 12. 35 are 10. 27 & 10. 58 ─

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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 27 September, 2022