RECORD: Darwin, C. R. n.d. Drosera / Frank has compared the hairs on pedicle & on disc of leaf. CUL-DAR60.1.72. 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: 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).


[72]

Frank has compared the hairs on pedicels & on disc of leaf after immersion for 3°. 15' in Chloride of Gold — All the little points intensely black.— some few of Hairs just tinged dull purple at tips — the little point points are present are present on footstalk. A leaf was immersed for about 1/4° in C. of Amm (2 gr. to 1 oz) & there was aggregation round & radiating from them in the cells of the tentacles & currents of protoplasm, just like beneath glands. (I saw a few days ago the contents of these little prominences aggregate from C. of Ammonia.) (We must remember that Drosophyllum has tentacles & absorbent glands on back of leaf are these rudiments of the absorbents & not of the secretors ?? This more probable view.— Dionæa

over

Drosera

[72v]

Weak Infusion of raw meat

(a) In 10° & compared prominences with 2 other leaves immersed for equal time in pure water. The prominences seem to consist of [sketch] the upper cells beng laterally double & I believe doubt bifid. — After meat, I think much more aggregation there after water, & I distinctly saw no changes of form in the little masses of almost colourless protoplasm in the upper cell. — These prominences are not confined to the outermost tentacles, They can hardly represent on the back rudimentary tentacles as in Drosophyllum, for otherwise tentacles branched must once have existed


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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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