RECORD: Darwin, C. R. 1873.10.03-19. I have just squashed some fresh red tentacles on paper. CUL-DAR56.89. Edited by John van Wyhe (Darwin Online, http://darwin-online.org.uk/)

REVISION HISTORY: Transcribed by Christine Chua and edited by John van Wyhe 2.2023. 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).


[89]

Oct 3d /73/ I have just squashed some fresh red tentacles on paper & added C. of Amm 1 gr to 1 oz & paper immediately rendered dirty green. Again I squashed some tentacles between 2 dry plate of glass & much purple juice exuded, which was quickly rendered colourless by a drop of above C. of Ammonia. — This is important observation, as it shows that the segregated masses which are purple are not due to actual absorption, but to the same molecular action which follows from mechanical irritation.

[specimen] — fresh stain with C. of Ammonia

[89v]

Oct 19' C. of Am 3 gr to 1. oz twice to reddish purple stain from old Hairs green [specimen]

This is important as yesterday I saw that the spheres were pink below Heads which were where action was started by the sol. of 1 gr to 12 oz

Squash a Hair & apply C of Amm to squeezed out juice

[not sure] whether molecular action

(over)


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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 14 May, 2023