RECORD: Darwin, C. R. ny.00.26-31. Cycas pectinata. CUL-DAR209.4.147. 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).


[147]

Cycas pectinata? (yes)

Movements of (Plumule or ) first leaf. (See Tracing A) not greatly magnified [sketch]

Made 1 little circle on 26th & next during night & next day travelled in very zig-zag course to one side— I know not cause.

(As the Petioles seemed to be moving irregularly in one direction, the Pot was placed on morning of 28th in Hot-house & heat kept up, 17 16—18C. & it moved first in one direction & then in another in zig-zag lines, but the tracing was too much magnified,

(At 5° P.m a new tracing (B) began the glass filament being fastened transversely across tip of leaf & continued till 11° a.m on the 31st. At close of observation to the petiole (with leaflets closely involuted) was 2 1/2 inches higher we see in Tracing how large & complicated & rapid the movements were. The actual amt of movement was betw .6 & .7 of an inch.— The case of Cycas interesting as with Coniferæ one of the oldest forms of Plant.

Plant illuminated feebly from vertically above part of ti[p] but this [text excised]


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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 26 September, 2022