RECORD: Darwin, C. R. & Horace Darwin. 1873.08.26-27. Vine leaves. CUL-DAR66.17. Edited by John van Wyhe (Darwin Online, http://darwin-online.org.uk/)
REVISION HISTORY: Transcribed by Christine Chua and edited by John van Wyhe 3.2023. 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 volume CUL-DAR66 contains notes on 'bloom'. Francis Darwin explained: "His researches into the meaning of the 'bloom,' or waxy coating found on many leaves, was one of those inquiries which remained unfinished at the time of his death. He amassed a quantity of notes on the subject". LL3: 339. See an Introduction to these folders by Christine Chua & John van Wyhe.
[17]
Down Aug 26th 1873 ✔
Vine leaves
3 vine leafs of the house placed under the bell glass at 2.52 Pm. in 1 oz of water
3 also in 1 oz of water in room at 7 65°
3˚ 2' Pm 75°
3˚ 35' 82°
6˚ 35' 90°
Aug 27th 8 35 Am 86° In room 12 oclock 66°
12 91°
Taken out at 12 (Red wafer hot; green wafer cold.)
In the cold water the leaves are a dull green in blotches
In hot water an orang[e] brown, very marked difference. Ones in hot v Hot solution of pale yellow. Cold solution colourless. Hot sol. most acid, by litmus paper. Hot sol. much most taste.
Citation: John van Wyhe, ed. 2002-. The Complete Work of Charles Darwin Online. (http://darwin-online.org.uk/)
File last updated 26 June, 2023