RECORD: Darwin, C. R. [1873]. Hydrocyanic / hydrochloric / nitric / sulphuric / muriatic / acetic. CUL-DAR56.54-58. (John van Wyhe ed., 2002-. The Complete Work of Charles Darwin Online, http://darwin-online.org.uk/)
REVISION HISTORY: Text prepared and edited by John van Wyhe. 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).
54
(1
Hydrocyanic Acid 30 m. of Strength of 1 to 437. of water
Sept 2d I. 8. 15'.
(p 75
(1)| 11. consid inflection in all 4 glands pale in morning
12. all strongly inflected; solution slightly discoloured
2. 30 all tents of all 4 leaves closely inflected.
4º 40' washed & all put into pure water
Sept 3d 8. Am the 4 leaves look much discoloured with glands colourless.— closely contracted, I think killed.— (changed water again with the specimen on p. 1— to 4 —)
(2)
Sept 4th 8. colourless, flaccid & evidently killed
― 5 8 all dead.
(3)
surrounding fluid colour very red
(4)
55
(2
Hydrochloric Acid 1 to 437 of water
Sept 2d. 8. 33'
(1) (5) (11. not decided)
(12. no action)
2. 30; some inflection— after 6. same
4º 40'— tent over pedicel inflected— after 8. almost some & t. over pedicel
— all put into water at 4º 45'
(2) (6) (2. 30' consid inflection — after 6. considerable
4º. 40' all tent inflect & lamina partially — after 8. all tent & lam.
(3) (7) (2. 30' a trace of inflection ― 6. a trace
4º 40 all tents sub-inflected & lamina partially. after 8— (repeat indicated of 'all tent & lam.' above)
(4) (8) 2. 30' very little inflection 6.
(4º 40' tents over pedicel inflected after 8.
(over)
55v
Sept 3d 8. 15' A m — I think are reexpanding glands pink— leaves look healthy
9. P.m. —x after 25. 3 of leaves almost reexpanded & aft 2 days fully rexpanded
Sept 4th 3 8. A m 00 do the 4th leaf still closely inflected & some of the glands quite white
Sept 5th 4 8' A m" — do in the same state — all the leaves expanded except one, & look rather fresh, & yet I think are functionless & some few glands white — far less injurious than other acids, for 3 leaves here quite reexpanded.
56
(3
Nitric Acid 1. to 437 water.
Sept. 2d. 10. 27'
(1) (9.) (11. no decided inflection)
(12. perhaps a trace of action & discolouration of water)
(1. great inflection & lamina — fluid reddish — 2. 30'
— (4º 45' all immensely inflected put into water (6. 30')— this in water
(2. 30' great inflection in all 4 leaves, except in 12 in which it is only moderate
(2) (10). 1. some inflection fluid do
(3) (11) 1. considerable inflection fluid do
(4) (12)
(over)
56v
Sept 3d 8. 15' A m — all still closely inflected— almost all glands colourless. but some not affected & still pink, & on 1 leaf many glands still pink
Sept 4th 8. A. in the same state
― 5 do no expansion — glands white leaves all killed.
57
(4
Sulphuric Acid to 1 to 437 Water
Sept. 2d. 10. 45'.
(1) (13) 1. some inflection
(2. 35' aft 4h. great inflection in all except 16 young leaf & in this only moderate in 14 lamina much inflected.
(4º 50', all except (16) young leaf) immensely inflected put into pure Water) aft 6h.
(2) (14) 1. consid inflect
(15) (12. consid inflection) (1. all tents inflected
(16) (1. slight inflection
N. B fluid from Prussic is very red, from Nitric a little so, & a fainter tinge from Sulphuric acid — none from Muriatic A.
(over)
57v
Sept 3d 8. 20'— 3 leaves still closely inflected (young pale leaf which was much affected still expanded— glands & some tentacles colourless but the greater number red. —
Sept 4' 8. ,2 of the leaves closely inflected; the third & rather young leaf, with the extreme marginal fully expanded, & sub-marg sub-expanded— the 4th young leaf in the same state with sub-marginals sub-i slightly inflected
5th 8. A.m. same state, the youngest leaf fully reexpanded, the others closed with glands white— very injurious but not deadly to young leaves
58
(5
Sept 3d. 8. 30' Acetic A. 1 to 437 of water
4 leaves in 20 drs. of the above.
(9. 50' all 4 leaves enormously inflected & laminae of 2 leaves.) (11. 10' water coloured most feebly pink)
(4º 45', water strongly coloured leaves flaccid, most closely contracted placed in pure water after crushing the leaves
Sept 4' 8. 10' — all most closely inflected — extraordinary dark red colour but glands colourless — I think almost dead.
5' utterly dead & dingy — glands colourless—
do. 8º. 35' Boracic A. do strength & quantity.
4 leaves. (11. 15' trace of inflection)
(2. 30', very slight inflection(
(11. 45' 2 leaves consid inflected a 3d & 4th somewhat do.)
Sept 4th 8. 15', 1 leaf pretty closely inflected, 2' rather closely, 3d & 4th moderately washed & put into pure water.
― 5 8. 23 30' almost fully reexpanded & look healthy
(Before Chromic)
Citation: John van Wyhe, ed. 2002-. The Complete Work of Charles Darwin Online. (http://darwin-online.org.uk/)
File last updated 30 November, 2025