RECORD: Darwin, C. R. 1877.07.10-08.07. Broccoli – Soaking. CUL-DAR66.113. 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.


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1877 Broccoli Cabbages — Soaking

July 10 9˚ A.m. Frank placed 8 cleaned & 8 uncleaned leaves of Walcherer Broccoli & placed in same quantity of water in Greenhouse — with cover to keep petioles (which were out of water) damp:

The leaves kept immersed by lead weight.—

(Also at 10˚. 45' 2 leaves 1 in each jar, with right side alone cleaned.)

(July 12th & 13th & 14th 12˚- 15th do —16th do — 19th do — 20th do 8˚ 30' non-cleaned sides dry, no difference in flabbiness)

(July 17th the vessel with cleaned leaves smells much more offensively than the other.)

(July 21' 5˚ P.m Fluid compared in the 2 vessels & no difference.)

(July 26th 8˚ 30' The leaves from which bloom not removed still quite dry: ie 16 days! No difference plain in state of leaves; but they were their decay was chiefly caused by pressure against sides of vessels & where bent.

The most rotten leaf was an uncleaned one & owing to the leaf the water in this vessel much the most turbid. Rather more rotten patches on the cleaned leaves but no clear difference. —

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July 28th the 1/2 leaves are still almost dry on the uncleaned sides.)

(July 31' still partially dry, especially lower side)

(Aug 2d 1/2 of leaves which had not bloom removed now almost wet everywhere)

Aug 7th no difference in the decay of the 2 sides


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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 5 July, 2023