The Complete Work of Charles Darwin Online

RECORD: Darwin, C. R. [ny].07.24-08.08. Eucalyptus globulus. CUL-DAR68.123. Edited by John van Wyhe (Darwin Online, http://darwin-online.org.uk/)

REVISION HISTORY: Transcribed by Christine Chua and edited by John van Wyhe 4.2023. 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-DAR68 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.

[123]

Eucalyptus globulus

July 24th 9° Clean space near base of leaf on top of shoot & put on some drops of water.

(N.B no difference in old leaf wh on which water rested; or in leaf which had both surfaces cleaned. — Can bloom protect from insects or parasitic fungi.)

July 25' 9° 11° A.m. removed bloom from one side of the quadrilateral axis. near summit, where bloom very thick & tied on bot of sponge, with no gutta percha. —

(N.B July 26 Compared leaf which was cleaned in June with a bit of opposite leaf from which I cleaned bloom to see if any difference in the greenness & there was none; yet ~~close~~ near to roof of House & during last month much bright sun.)

Aug 8th 9° no effect on leaf with drop of water since the 24th — quadrilateral axis colour not altered, but a few minute brown specks. —

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