RECORD: Darwin, C. R. [ny].09.03.-12. Drosera anglica or some var of longifolia. CUL-DAR60.1.123-125. (John van Wyhe ed., 2002-. The Complete Work of Charles 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).


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Drosera Anglica a rare Var. of longifolia. or sp.

The Leaves much elongated gradually widening upwards from footstalk to tip, which is rounded or bluntly pointed. — I could perceive no difference in action from D. longifolia.

Sept. 3d. Part of fly put on middle of 3 leaves, inflection slow, but now after 24º, no marginal inflection of leaf, but the tip bent down of on fly, even on one part fly placed near to base of leaf, into a hook-shape — so that the extremity had passed through 180º — in 2 of the leaves every tentacle inflected one f the flies now humid with secretion — (Atoms of quite dry meat placed on glands caused plain movement in 1' or 1' 30'—

In one of these tentacles after 1º 10' great inflection, which carried to centre of leaf, & purple fluid all aggregated into lumps in whole upper part of the tentacles.

Touched several 1/2 dozen times with needle glands of 3 marked tentacles; one of them in 17' well inflected, & in 24º was straight again the 2 others never moved.

[1v]

(Secretion acid)

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D. Anglica Sept 3d at 8º 46' put on 2 bits of boiled cork, 1 of boiled Thread, 2 of cinder from fire. — 2 scales of Sphagnum had previously apparently lately fallen on 2 glands— in After 8º 45', one bit of cinder & the 2 scales of sphagnum had caused inflection.

Next morning after 23º 15', both the 2 cinders, the one of the 2 corks, & the thread had all caused some inflection, ie 4/5 of particles had acted, not containing the sphagnum

The tentacles with scale of sphagnum had become straight again. —

Examined one of much inflected tentacles; the inflection is near base; the concave side very pale purple middle darker, & convex darkest side: but in another straight tentacle, not acted on by meat meat, the colour was similarly distributed, so that this seems the natural colouring & it makes me doubt about the common Drosera.

The convex outline of convex side of the tentacle with meat looked straight more rigid than the out-line of concave side. — Carb. of ammonia cause. great segregation — It lessens the purple tint on both convex & concave sides.

[2v]

Sept 12' D. Anglica old leaf 1.1 long & only 2 of inch broad.


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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 February, 2023