RECORD: Darwin, C. R. n.d. Acids (much diluted) causing inflection of the tentacles. CUL-DAR51.C16. (John van Wyhe ed., 2002-. The Complete Work of Charles Darwin Online, http://darwin-online.org.uk/)
REVISION HISTORY: Transcribed and edited by John van Wyhe 11.2025. 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.
C16
Acids (much diluted) causing inflection of the tentacles
(1) Nitric,— strong inflection.— poisonous
(2) Hydrochloric,— moderate & slow inflection, not poisonous
(3) Hydriodic,— strong inflection — poisonous
(4) Todic do do
(5) Sulphuric do somewhat poisonous
(6) Phosphoric do poisonous
(7) Boracic,— moderate & rather slow inflection, not poisonous
(8) Formic — very slight inflection, do
(9) Acetic, — strong & rapid inflection, poisonous
(10) Propionic strong, but not very rapid inflection poisonous
(11) Oleic quick inflection very poisonous
(12) Carbolic very slow inflection poisonous
(13) Lactic slow & moderate inflection do
(14) Oxalic moderately quick inflection very poisonous
(15) Malic very slow but considerable inflection, not poisonous
(16) Benzoic rapid inflection, very poisonous
(17) Succinic moderately quick inflection, moderately poisonous
(18) Hipparic rather slow inflection poisonous
(19) Hydrocyanic rather rapid inflection very poisonous
Acids (much diluted) not causing inflection
――—
(1) Gallic not poisoning
(2) Tannic do
(3) Tartaric do
(4) Citric do
(5) Uric (?) s do
C16v
Hackel Siphonophora
Citation: John van Wyhe, ed. 2002-. The Complete Work of Charles Darwin Online. (http://darwin-online.org.uk/)
File last updated 26 November, 2025