RECORD: Darwin, C. R. n.d. Drosera / (only just perceptibly acid to taste). CUL-DAR60.1.91. (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).


91

Drosera

June 27th    11.— (only just presenting acid to taste)

Propionic acid    1 to 437.5 of water    3 leaves in 90 minims

(11. 25'.)

(12. .50'.) after 1. 50' .

2. 40', 1 leaf greatly inflected

   2. & 3.    slightly— after 3. 40'

(5' 30'    1 incurving gland white; a 2d considerably & 3d much sub-inflection.)

(7.    very Strong inflection in all 3 leaves) —except one incurving so still after 8.

27' 7. 30 after 20h — no movement in fluid perfect (illegible) (some aggr. ?)    glands very pale pink, but oddly some on disk blackened

(Slow inflection, & no increase.)

28th 9. — washed & put in water — leaf which was most affected & soonest viz at 2. 40' was carefully examined — No aggregation, but traced brown of the protoplasm oddly collected in base of cells.— this leaf most flaccid — death might have stopped subsequent process of aggregation — I also examined 1 of other leaves, which may recover & no trace of aggregation — I might put in C. of Ammonia at 9. 30' at 3. 30' no trace of aggregation, all discoloured)
(29 8. seem utterly dead)
30th 8. A.m manifestly dead.

Return to homepage

Citation: John van Wyhe, ed. 2002-. The Complete Work of Charles Darwin Online. (http://darwin-online.org.uk/)

File last updated 1 December, 2025