RECORD: Darwin, C. R. n.d. Thirdly— whole leaves were cut off & immersed for stated times in a measured quantity of the solutions under trial. CUL-DAR61.75. 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: 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).


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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 [illeg] in such refer not to same [illeg] of sets the same distilled water = This perhaps the [3 words illeg]

(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    is shown in the accompanying fig. (drawing) & 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). — But there is another important effect caused produced by various the several of the

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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/)

File last updated 26 December, 2022