RECORD: Darwin, C. R. 1874.05.25-26. Sleep of Plants. CUL-DAR68.54-55. 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.


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1874

Sleep of Plants.

May 25th Common Red Clover — Terminal leaflet either stands vertically up or a little bowed over, like a roof, over the 2 lateral leaflets now approximate together.

26— upper & lower surfaces of all leaflets beautifully silvery in water.

Bloom

May 25. Alsike clover. T. hybridum (Hooker) — like white clover — terminal bowed like a roof over the 2 lat. leaflets together, or stands vertically up. —

26th Leaflets like those of red. Clover, beautifully silvery.—

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Trifolium incarnatum (May 26') both surfaces of all 3 leaflets finely silvery in water — Both surfaces hairy, but the hairs project through the silver & do not cause it.

Rubbing with camel brush. wets the part thus rubbed — Asleep. 9° 40' terminal leaflet, generally vertically upright & plane in line of pedicel; but in some leaves bent over as a roof. — The 2 lateral leaflets approaching each other, but not nearly asleep close. —

Touching with ether upper & lower surface instantly removes silver

Trefoil Both surfaces of 3 leaflets silvery — lower surface more easily wetted than upper; but a shake makes lower surface dry — so it is true silver. —

Asleep— very nearly like T. incarnatum, but as terminal leaflet moves often roof-like lateral leaflets approximate, but far from close. — (about Ether as in incarnatum


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

File last updated 11 July, 2023