RECORD: Darwin, C. R. 1874.06.17. The last of all the Summaries on water. CUL-DAR57.86. Edited by John van Wyhe (Darwin Online, http://darwin-online.org.uk/)

REVISION HISTORY: Transcribed by Christine Chua and edited by John van Wyhe 1.2023. 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 volumes CUL-DAR 54-61 contain material for Darwin's book Insectivorous plants (1875).


[86]

(Jun 17th 74 The last of all th Summaries on water)

106 141 + 32 = 138 173 leaves tried; of these 141 tried at the same time with salts: 32 tried separately; These observed generally for 24˚ & others longer & many other scores of specs. of in water observed but no exact record kept

[table and calculations not transcribed]

One leaf alone had almost all inflected; 67 were somewhat in 3 had most of their tentacles sub-infected. These 4 may be subtracted from the t so that 17 leaves out of the 173 were considerably affected.

It deserves special attention that all the leaves which were greatly affected were from plants forced in cool Hot-House during winter (& I never saw such fine & vigorous leaves): I wd not have used them, had I known, but it was fair for salts as those in water were used at the same time

(I at one time suspected that movement was due to distilled in study being colder, but I tried water at 45° ie. 70° colder than HotHouse, but no marked effect.)

The leaves from HotHouse consisted of 35 43 4 / 71


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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 16 May, 2023