RECORD: Darwin, C. R. 1877.09.03-10.07. Averrhoa. CUL-DAR67.3. 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.


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Sept 3. 1877

Averrhoa

I find if warm finger left for a few seconds a shade is momentary left, as in Nelumbium. & water will adhere better to surface— If then stream of water at 89° is run over leaf, very slight or no mark; but stream of water at 100° leaves a momentary trail. It is very difficult to get spheres of water to adhere to uncleaned leaf. — — 12 leaflets altogether with

(Pinned down leaf moderately greasy & sponged with water at 85° above near on left had leaflets, (not terminal one) & put on drops & on opposite leaves on right with which were not sponged.

12 leaflets altogether with water, occasionally dry

Sept 17th 10˚ freed leaf marked red-wool can see no injury to leaflets

Oct 7th 4 leaflets on left or near side which were sponged are now spotted with yellow where water lay; & 2, below the terminal one on right side — so that 7/12 are spotted.

This wd be conclusive evidence that some injury had been done, has not 2 next leaflets on left side & 1 on right-side, where no water lay, are equally & one much more spotted; but then these lay, I believe on cork & I remember much water ran over cork from the right side & then they were sodden. /over

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The basal leaflet quite green.

(The plant was kept in semi-obscure cupboard, with only one hole for light, & when latter plant this morning was fast asleep, & did not begin to wake, though put in light till 12˚ 15' & then only the upper leaves)


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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 13 June, 2023