The Complete Work of Charles Darwin Online

RECORD: Darwin, C. R. 1877.10.15-16. Oat Avena. CUL-DAR209.4.36. 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).

[36]

Oct 15' Oat. Avena 1877

A young leaf 1 1/2 inch high quite free with tip white & red pin-head traced on horizontal glass. see diagram (1) moved to light all day, but oddly zig-zag from 11° 32' to 512', looks like nutation. — From 6' to 10° 25' moved very little, & during rest of night continued to move in same direction towards light.—

Oct 16 New tracing all in same position, but more magnified. see diagram (2) went on moving to light: 11° 3' to 11' 33' day more cloudy & nutation. From 12° 35' for some hours sky wonderfully black, & there is strong nutation. I cannot decide whether nutation destroyed or only masked by heliotropism.

This well worth giving

(Used)

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