The Complete Work of Charles Darwin Online

RECORD: Darwin, C. R. 1877.09.29. Cassia. CUL-DAR209.4.107. 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).

[107]

Sept 29' /77 Cassia seedlings from St. Catharina

The short petiole of the cotyledon, prominent on enlarged on upper & lower surface, where it is transversely wrinkled.

Gummed bristle to axis passing between base of opposite cotyledons & placed plant in middle of room so that the 2 cotyledons directed to light & in course of day the one above with cross turned up almost at right angle to the other. [sketch]

In the morning there was trace of movement in bristle, probably due to whole plant bending a little to the light, but afterwards no nutation or other movement in th stem.— Mark placed on soil.—

No change when seedlings asleep

Citation: John van Wyhe, ed. 2002-. The Complete Work of Charles Darwin Online. (http://darwin-online.org.uk/)