RECORD: Darwin, C. R. 1877.08.03-30. Schrankia. CUL-DAR66.133-135. 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.


[133]

S. anguilata by A. Gray's description) Schrankia Aug. 3. 77.

Leaflet white thin; sometimes 2 additional pinnæ, so that 2 or 3 pairs— Upper right-hand, leaf pinna horizontal, its opposite pair inclined —The 2 next leaflets pinnæ inclined upwards to N.E. 63° [annotated sketch]

(When asleep the leaflets are all directed to apex of pinnæ, so as to overlap, as in mimosa, but not so closely. The 2 terminal pinnæ converge & bend almost vertically downwards. The lateral pinnæ (still remaining at ∟ angle to main petiole) also bend almost vertically downwards. The main petiole at 9° had fallen to 40° with the ax stem.

Next morning at 10˚ 45' I cd perceive no difference. Next morning ∟' a little larger I doubt whether any change in angle of petiole.

Aug. 3d 10˚ 30 syringed for 2' with water at 80°, & shook for 1' afterwards caused leaflets to close approach each other & to point towards apex of leaf to about half distance or angle between their horizontal & sleep position. This movement wd be little of no protection against rain, or perhaps a little use. — Did not move so much when touched, but day coldish. No water remained on leaves after syringing.

Dyer considers the species S. uncinata.

[134]

Schrankia

Waved leaflet for 1' in water 85°-83, bloom not removed; same from another 1' in 85°, bloom removed both sides

waved leaflet for 1' in water 85°, bloom not removed same leaflet for 1' in 85°-84° partially removed—

Another leaflet which had been exposed for 1' to 85° was again exposed for 1' to 85°-84°, bloom almost entirely gone.

waved leaflet in for 30" in water at 90° partially removed; for additional 30" almost entirely gone.

Another leaflet for 10" in 95° partially removed, same leaflet for 15" in 95° not quite removed.

I immersed whole leaf in water at 86°, but this did not cause leaflet to close

[Aug 8th — Plants sickly, I syringed for nearly 2' with water at 85° a leaf, but no marked effect was produced.

[135]

Aug. 28th 1877 Schrankia— — Plant not very healthy — goes to sleep as described f before —The primary primary or main petiole does not sink, at least in early part of night—The 2 terminal pinnæ were during day at right angles, & converged to this angle ++ at same time curving downwards, — as did the succeeding pair of pinnæ petioles.—

[Annotated sketch]

Aug 30 Syringed for 2' with water at 85°, leaflets rose up, but not nearly so as to approach — no movements of petioles, that I could see


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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