RECORD: Darwin, C. R. [1878].11.26-27. Phalaris / Proof sheet of Forms of flowers. CUL-DAR209.7.109. Edited by John van Wyhe (Darwin Online,

REVISION HISTORY: Transcribed by Christine Chua and edited by John van Wyhe 8.2022. 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 volumes CUL-DAR209.7-8 contain notes on heliotropism (phototropism) for Darwin's book Movement in plants (1880).


Light Experiment

Nov. 26th 11° 20 mortar lighted Canary Experiment


8° 25' P.m neither pot any effect

However at 3° P.m. I thought that pot A was affected. would they have been temporarily affected

At 10° 25 P.m new mortar lighted & pot B put 2 1/2 inches from light. At 8° A.m Nov. 27 light still burning, plants examined— not the least effect on plants in A, whereas all younger plants in B were bowed almost at right angles to light. — 3 with black paper caps depending 2. of inch were not affected or perhaps one was very slightly affected. I put indian ink on tips of 2 1 not affected the other considerably but here ink very thin.— I cut off tips of 2, one of them much curved, but white tip had grown out of sheath; the other somewhat affected & here I think white inner portion had grown considerably


[Proof sheet of Forms of flowers, published pp. 101-102.]

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Citation: John van Wyhe, ed. 2002-. The Complete Work of Charles Darwin Online. (

File last updated 25 September, 2022