RECORD: Darwin, C. R. n.d. Acids causing inflection of the tentacles. CUL-DAR60.2.90. (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).
90
Acids causing strong inflection of the tentacles
Nitric strong inflection; poisonous
Hydrochloric (moderate & rather slow inflection) not poisonous
Hyrdiodic strong inflection & poisonous
Iodic strong inflection;. poisonous
Sulphuric, strong inflection; somewhat poisonous
Phosphoric do. poisonous
Boracic acid
Chromic rapid inflection; highly poisonous
Arsenious very rapid inflection, poisonous.
Formic
Acetic, Strong & rapid inflection poisonous.
Oleic great inflection deadly poison
Camphor very slow inflection, poisonous.
Lactic slow & moderate inflection — poisonous
Oxalic moderately great inflect deadly poison
Malic A.
Benzoic quick inflection deadly poison.
Succinct moderately quick inflection moderately poisonous
Hippuric rather slow inflection; poisonous.
Hydrocyanic rather rapid inflection highly poisonous.
12 [+] 6 [+] 5 [=] 23
16 17 [+] 6 [=] 22 — 18 if Lactic used
23 tried
18 cause inflection
Malic
Acids causing slight inflection
Hydrochloric moderate inflection
Boracic, moderate & rath slow inflection (not poisonous) must go with H. A. in same column.
Formic very slight action, not poisonous
Malic, cause considerable inflection but acts very slowly.
Olive
Uric
Acids not causing no inflection.
Lactic, I believe have no doubt killed too suddenly.
Citric (4)
Tartaric (3)
Tannic (2)
Gallic (1)
Uric ?
6 — 5 if L. excluded [+] 16 [=] 22. 23
Citation: John van Wyhe, ed. 2002-. The Complete Work of Charles Darwin Online. (http://darwin-online.org.uk/)
File last updated 1 December, 2025