RECORD: Darwin, C. R. [1877].08.29-10.13. Walcheren Broccoli. CUL-DAR67.18. 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.

Darwin discussed Walcheren broccoli only in Variation 2: 310.


[18]

(Walcheren Broccoli cleaned on Aug 29th —  Sept 20th Half-grown leaf— when held up to light the difference was wonderful between the 2 sides, as the puncture, & holes were larger on the right & cleaned side — showed the leaf to persons

left side 113 — right— cleaned side 357.

I gathered this leaf so soon because caterpillars were devouring the leaves in the same bed quickly. —)

(Oct 7th Red Cabbage smallish leaf right side rather most decayed

Lenny counted puncture & hole: left side 62, right- & cleaned side 271.)

(Oct 13th — Red Cabbage no difference in decay — smallish leaf.

On left side 38 punctures & holes — 88 on right & cleaned side.)

[18v]

Aug 29th 11˚. A.m Red Cabbage 1877

Cleaned both upper & lower surface of right side of 2 leaves: tepid sponges. White wool Bloom more on veins. —

Observe [few words obscured]

Aug 29th 11˚ A.m Walcheren Broccoli

Cleaned 2 leaves as above. — white wool

(Sept 4th 9˚ It is wonderful (especially with one leaf) that in one week, the cleaned side has been far more punctured than other side with bloom.) I could see hardly a puncture on the left side.

(Sept 9th 7˚ 30 A.m. The leaf was now barely 12 inches in length, & there was not so great a difference between the two sides, yet I gathered it (only 11 days after having been cleaned. The difference was conspicuous; on left side there were 72 punctures & holes, on right side 265. —

(over)


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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 23 July, 2023