RECORD: Darwin, C. R. [1860]. 10.01-14. Eastbourne. Oct 1. — Drosera longifolia. CUL-DAR60.1.126-127. 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).
See important notes and letter from Darwin to Daniel Oliver on this subject in Correspondence vol. 8, pp. 465-6.
[126]
Eastbourne
D. longifolia
Try sensitising to touch & [illeg] of inorganic matter on glands
Is tip of leaf naturally reflexed?
Colour of uniform side of Hairs tentacles?
(9
Eastbourne. Oct 1. — Drosera longifolia
Examined some incurved Hairs — The convex side pale & concave dark red with few spheres near glands & necklaces; but very little solid-matter. The division is exactly medial to spiral runs in darker side half—
But then these spec. had been for above a day in water. — I could just detect trace of movement in these spheres — one budded & separated from larger one; & one moved away from others — No circulation — no difference in heads of marginal hairs.
Oct 3. Examined another leaf of D. long, which arrived broken off— all marginal Hairs bowed into Hooks — the convex side always colourless & concave dark red, but only in lower & curved part of Hair— but then I see same law of colouring in disc of leaf— & this may be only usual law of colouring—
(It naturally catches plenty of flies by lateral Hairs inflected.)
Oct 7. put 2 leaves for 2 hours with inflected Hairs in sherry & there is no difference in colour on under & upper side of Hairs
Oct 7th Put another leaf which had under side of Hairs white & several several perfectly empty & colourless cells in Wine for about 3/4 hour in tin Box, & these colourless cells became as red as any of the others so that red somehow comes into cells. I have also noticed occasionally empty cells in inflected hairs of D rotundifolia, which probably never takes place without inflection
Oct 14th certain just reverse [sketch] dark red — ─ colourless
[127v]
Eastbourne
Starch
D. longifolia
Besides salt & nitric acid
p. 3 Starch
p. 3 White Leaf in Starch
p 4. Milk &c on Back of Leaf
5 Albumen back of Leaf
7, 8 Gum
8. Whole leaf in gum
9 Leaf, structure of Hair after 24˚ in W D' longifolia
colour filling empty cells
Citation: John van Wyhe, ed. 2002-. The Complete Work of Charles Darwin Online. (http://darwin-online.org.uk/)
File last updated 14 February, 2023