RECORD: Darwin, C. R. [ny].09.20-[ny].09.21. Drosera experimental observations. CUL-DAR60.1.75-76. Edited by John van Wyhe (Darwin Online, http://darwin-online.org.uk/)

REVISION HISTORY: Transcribed and edited by John van Wyhe 6.2025. 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).


75

Sept 20 9.15

Straight wires Bits of Paper & fir-wood on extreme marginal Hairs 3 of each.-

(10.15 the 3 bits of paper rolled up by finger were carried to middle of leaf.—)

(10.15 one bit of wood rolled to centre.

10.35 3 bits of paper rolle up by [illeg] ([illeg] L wire) 11.35 one or two carried in to a certain extent 2.18 all carried nearly to centre (4)

21st 8.45 all six bits of paper are now carried to centre (it is really pretty), but any two are well closed, very differently from flies.

75v

Sept. 20 9 A.M. Syrup (black card)

2.15 no effect

Spec 1. 21 9 A.M. no effect / 21 5 P.M. 32 hours no effect milk. / milk 22d 9.15 considerable effect

Spec. 2 do. Do/do 32/ milk 22d 9.15 some slight effect

Spec 3. 21 9A.M. two — long-headed inflected /same state 5 P.M.

22d 9.15 all hairs straight

Spec 4 do foot stool marginal drawn down apparently mechanically.

Do 5 P.M.

22d 9.15 then marginals quite straight no effect

Spec 5 do. No effect / do no effect: Gelatine /

22d 9.15 considerable effect—

This was same syringe which produced such extraordinary extension[?] in the leaf put on it —

76

Sept 21 11.45 yellow card.

Acetic acid 10 minutes to 5 oz five oz disabelled w. very weekly acid to taste

A spec no effect 5 P.M. 22d 9 A.M. no effect /  22d 12.15 no effect (i.e. 24 ½ hours)

2 spec 5 P.M no effect / 22d 9 no effect / 22d 12.15 no effect

3 spec 21 5 P.M no effect / 9 no effect / 22d 12.15 no effect

4 spec do 3 footstalks marginals arched over. / 22d 9 no effect / 22d 12.15 no effect

5 sp 5 P.M no effect / 22d 9 do put on nitrate 22d 12.15 milk

No effect, but then on only 3 ½ hours

6 sp. 5 P.M no effect / 22d 9 do put on milk.— do about milk

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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 12 June, 2025