The Complete Work of Charles Darwin Online

RECORD: Darwin, C. R. 1880.03.26-27. Ipomœa leptophylla. CUL-DAR209.6.93. Edited by John van Wyhe (Darwin Online, http://darwin-online.org.uk/)

REVISION HISTORY: Transcribed by Christine Chua and edited by John van Wyhe 12.2022. 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-DAR209.6 contains materials for Darwin's book Movement in plants (1880).

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Ipomœa leptophylla— 1880

March 26th 9° 47' a.m touched one side of tip of radicle dried, thrice with dry caustic.— Root will probably become more geotropic, not if acted on will bend laterally.— Too much blackened whole tip Killed─ no lateral bending. Nevertheless the petioles which were inclined under seed have now 9° 30' P.m become vertically geotropic—

Reversed seed so petioles now point to zenith

— 27th. 7° 30' a.m tip considerably bowed geotropically.

March 25th 7° 47 a.m. (Big-pin.) touched with caustic so as to bend radicle in plane at right angle to that including the 2 petioles.

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