RECORD: Darwin, C. R. 1880.02.20. Radicals of Yorkshire Hero Peas. CUL-DAR209.5.147-148. Edited by John van Wyhe (Darwin Online, http://darwin-online.org.uk/)

REVISION HISTORY: Transcribed by Christine Chua and edited by John van Wyhe 5.2023. 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-DAR209.5 contains materials for Darwin's book Movement in plants (1880).


A

(Conclusion)

Feb 20th 18 Radicles of Yorkshire Hero Peas  with little sqr of sand-paper shell-lacced at 4 mm to one side of apex— fixed laterally so as to avoid Sachs' curvature — germinated in Peat Peat, not but badly— very many grow monstrous,— Excluding

Pinned over water on Study Table in dark.

Excluding 3 which grew monstrous 11. were thus tried & of them 4 were not acted on & 7 became bowed to side on which card was fixed— slightly in course of 5°. 45' & m more plainly after 14 hr— 2 of the radicles were bent, so that terminal portion was 41° from the perpendicular downwards & one as much as 62°. It was highly remarkable that no transmitted effect, curvature could be seen, curvature being confined to spot where bit of card affixed—

Very valuable the contrast with effects of same kind & size of card similarly fixed to one side of apex.

[Av]

It is strange that bits of card were fixed either at same time Feb. 20th or subsequently to tips of 7 radicles & not one in the least affected — fixed on tip & side of on 2 no effect.—

As I have said germinated badly—

(1

A

Feb. 20th 1880 8° 15' a.m Radicles Peas — with little square of card — shell-lacced on one side at 4 mm above apex— suspended over water— 2 on tips — germinated in Peat on study Table (Jar. A)

[data not transcribed]

(2

See other side.— same — commencement average time 8° 35' a.m

Jar B.

[in margin:] In all the cases the bending from the card abrupt & no effect transmitted to a distance)

[data not transcribed]


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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 26 July, 2023