RECORD: Darwin, C. R. [1872-1873]. ['On the movement of the leaves of Drosera'], folios 44-45. CUL-DAR61.75. (John van Wyhe ed., 2002-. The Complete Work of Charles Darwin Online, http://darwin-online.org.uk/)

REVISION HISTORY: Transcribed by Christine Chua and John van Wyhe, edited by John van Wyhe 12.2022. RN2

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).

The volume CUL-DAR61 contains Darwin's draft essay 'On the movement of the leaves of Drosera', written 1872-1873. He intended to publish this with a revised edition of Climbing plants before commencing a larger book draft in April 1874 which became Insectivorous plants. See the introduction to this essay by John van Wyhe.


[75]

44

Firstly

Thirdly — whole leaves were cut off & immersed for stated times in a measured quantity of the solutions under trial: The same number of leaves by being placed on such refer not to same [certainty] of sets the same distilled water - This perhaps the [3 words illeg]

[sheet of same blue paper pasted on:]

(The effect on the leaves, of the several saline solutions & of different strengths of the same solution [line in pencil illeg] was judged of by the inflection of all or of a large number of the marginal tentacle & sub-marginal tentacles; or when a single tentacle was tried of by its inflection.

The conspicuous result of the immersion of a whole leaf in for instance a weak solution of  [blank space]  is shown in the accompanying fig. (Drawing [blank]) & this figure shd be compared with that (fig. 1) of the a leaf in its expanded condition. The appearance of a single tentacle acted on by by one of the minute drops of same solution is shown by the letter a  in fig. ... (Drawing [blank]).— But there is another important effect caused produced by various the several of the

[another sheet of the same paper pasted on:]

(45

solutions, viz the act of segregation aggre of of the fluid contents of the cells of the glands, & more especially of the cells forming the pedicels of the tentacles; for these latter cells can be more easily observed. But in meaning of the term segregation & the curious phenomena there with connected must first be explained at some little length.

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

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