RECORD: Darwin, C. R. 1877.12.28-30. Vicia faba / Draft of Cross and self fertilisation. CUL-DAR209.4.414-415. Edited by John van Wyhe (Darwin Online, http://darwin-online.org.uk/)

REVISION HISTORY: Transcribed by Christine Chua and edited by John van Wyhe 9.2022. 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.

Draft of Cross and self fertilisation in the hand of Ebenezer Norman with corrections by Darwin.

"Norman, Ebenezer, 1835/6-1923. 1854- Schoolmaster at Down and from 1856 and many years thereafter copyist for CD. 1856 Aug. 17 First payment for copying in CD's Account book (Down House MS). Many thereafter. CCD6:444. 1857 CD to Hooker, "I am employing a laboriously careful Schoolmaster". CCD6:443. 1858 CD to Hooker, "I can get the Down schoolmaster to do it [i.e. transcribe] on my return". CCD7:130. 1871 Banker's clerk in Deptford." (Paul van Helvert & John van Wyhe, Darwin: A Companion, 2021)


[414]

Natural Scale i.e not reduced no lettering

Tracing N

From 8˚40' P.m, 28th to 10˚ a.m 30 a.m 30

(Fig 16) (not scale)

[415]

V. f. circumnutation of same epicotyl as on fig 22, slightly a little more advanced in age, traced under similar circumstance as before fr 8° 40' P.m. Dec 28th to 10. 50' am. Dec on the 30th. Movement of end of filament here here [magnified] 20 times. —

Fi

(Circumnutation of young plumules)

 Fig. 15. enlarged about 10 times (20 in the original

— 16 enlarged about 20 times

[415v]

(31) 587

Chapter 0 9

from one of the other plants, and they all produced fine capsules.) (Being As I felt much surprised at the difference in the results of the trials made during the two previous years, six fresh plants in the following year 1870 were in 1870 again protected by separate nets. Two of those proved almost completely self-sterile, for on carefully searching when I found only three small capsules each containing one or two seeds of small size which however germinated. I A few flowers on both these plants were reciprocally fertilised with each other's pollen, and a few with pollen from one of the self-fertile plants, and all these flowers produced fine capsules. The four other plants whilst still remaining protected beneath the nets presented a wonderful contrast (though one of them in a somewhat less degree than the others) for they became actually covered with capsules, as numerous as, or very nearly so, and as large fine as those on the uncovered plants growing near.)

(The above three spontaneously self-fertilised capsules producing the two almost completely self-sterile plants, contained altogether five seeds; and from these I raised in the following year (1871) five plants which were kept under separate nets. (lead on)

[Cross and self fertilisation, pp. 338-9: "The flowers on four small branches of this semi-self-sterile plant were smeared with pollen from one of the other plants, and they all produced fine capsules.
As I was much surprised at the difference in the results of the trials made during the two previous years, six fresh plants were protected by separate nets in the year 1870. Two of these proved almost completely self-sterile, for on carefully searching them I found only three small capsules, each containing either one or two seeds of small size, which, however, germinated. A few flowers on both these plants were reciprocally fertilised with each other's pollen, and a few with pollen from one of the following self-fertile plants, and all these flowers produced fine capsules. The four other plants whilst still remaining protected beneath the nets presented a wonderful contrast (though one of them in a somewhat less degree than the others), for they became actually covered with spontaneously self-fertilised capsules, as numerous as, or very nearly so, and as fine as those on the unprotected plants growing near.
The above three spontaneously self-fertilised capsules produced by the two almost completely self-sterile plants, contained altogether five seeds; and from these I raised in the following year (1871) five plants, which were kept under separate nets."]


Return to homepage

Citation: John van Wyhe, ed. 2002-. The Complete Work of Charles Darwin Online. (http://darwin-online.org.uk/)

File last updated 7 December, 2022