The Complete Work of Charles Darwin Online

RECORD: Darwin, C. R. 1881.07.11-12. Marsilea quadrivalva. CUL-DAR67.68. 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-DAR67 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.

[68]

July 11th 1881. Marsilea quadrivalva

Syringed 2 nice leaves with water at 90° F. from above for 4' & certainly induced no downward movement, or any movement like the conspicuous sleep─ manner—

Desmodium Sp. I from F. Müller which sleeps conspicuously by vertical depression of all 3 large leaflets. — syringed from beneath for 4' with water at 94° no plain effect— Goodish case, seeing how plainly D. gyrans moves. — —

July 12' tried again syringing with water at 90°, plant out of hot case, & no true movement, but the terminal leaflet of very young leaf became depressed from adherent drops of water or from the agitation—

lateral leaflets did not move. —

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