RECORD: Darwin, C. R. 1877.08.03-08.12. Fruit, unripe of Castor-Oil. CUL-DAR66.137. 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.


[137]

Aug. 3d. 11˚ 1877 Fruit, unripe of castor-oil.

Whole & peduncle & spike covered with bloom, beautiful, when shaken in cold water comes out quite dry;

Waved one 2 & brushed lightly with camel in water at 90°, so that most of bloom removed & all from spines & a pair to be syringed often marked white Thread

(Aug 12th 11˚ cleaned 4 more, however, little more than spike can be cleaned & space along suture a little & added 3 others not cleaned

The one which was cleaned on Aug 3d now quite rotten one uncleaned at same time quite sound.—

Aug. 20' 8' 1 with bloom rotted.

21. 1 with bloom mouldy

22 1 other with bloom mouldy & soft.

25 Summary 3 all 3 which were left rotten, whereas not one of the 4 which were cleaned is rotten & no doubt this is due to the cleaned ones dryer, notwithstanding their syringing having dried

Aug 3d — 11˚ A pair left dry — white thread

11' 8˚ The projections on the uncleaned yellower

― 18 of this pair the cleaned one certainly with all filaments projection much dryer & when cut into two a conspicuous difference in browning of partitions of seed-cells

Aug 12˚ 11˚ added 2 more & 2 uncleaned.

― 19th The projections of 2 cleaned pods far more flexi flaccid than of those with bloom

25 I cd perceive on cutting open the 2 pairs no difference in their dryness.

[137v]

(a) Altogether 5 with bloom were syringed & 4 with bloom removed were syringe— one of the cleaned ones rotted first, where the 4 others with bloom rotted before the others — Perhaps the drying may have something to do with it.


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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