RECORD: Darwin, C. R. [1880].04.24. Radicles of Peas with squares of card gummed to tips / Draft of Forms of flowers. CUL-DAR209.5.155-156. Edited by John van Wyhe (Darwin Online, http://darwin-online.org.uk/)
REVISION HISTORY: Transcribed by Christine Chua and edited by John van Wyhe 5.2023. 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-DAR209.5 contains materials on movements of radicals for Darwin's book Movement in plants (1880). The text of the draft corresponds to Forms of flowers, p. 234.
[155 & 156]
Radicles of Peas with squares of card gummed to tips sanded-paper — shell-lac
(same scale, no lettering attend to little squares of attached card.)
[square piece of paper pasted on:] April 24th size of square of card .04 [x] .07 of inch — (give size)
Pisum sativum: radicles suspended at first perpendicularly downwards, with little square of card affixed with shell-lac to one side of apex, causing in 24hr deflection to the opposite sides.
The 2 bits of card of the same size here used on this [2 lines illeg]
[156]
ratio only of 5 to 100! There can therefore be no doubt that illegitimate fertilisation continued during successive generation affecting the powers of growth & fertility of t P. veris to an extraordinary degree; more especially when the plants are exposed to th ordinary conditions of life, instead of being protected in a greenhouse.
(one line open)
Citation: John van Wyhe, ed. 2002-. The Complete Work of Charles Darwin Online. (http://darwin-online.org.uk/)
File last updated 27 July, 2023