RECORD: Darwin, C. R. & Francis Darwin. [1877].12.10-[1878].01.12. Veg. Marrow / Draft of Forms of flowers. CUL-DAR209.4.261-262. 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. The volume CUL-DAR209.4 contains materials for Darwin's book Movement in plants (1880).


[261]

Dec. 10th

Veg. Marrow Radicle

[data not transcribed]

(Used)

[261v]

soon fell off, showing that they had not been properly fertilised. At the same time five short-styled plants were similarly treated, and they bore 116 flowers which set in the same manner ultimately produced only seven capsules. that did not fall off. On another occasion thirteen protected long-styled plants yielded by weight 25.9 grains of spontaneously self-fertilised seeds. At the same time seven protected short-styled plants yielded only half-a-grain weight of seeds. Therefore the

[Forms of flowers, p. 42: "In order to ascertain how far the present species was spontaneously self-fertile, five long-styled plants were protected by me from insects; and they bore up to a given period 147 flowers which set 62 capsules; but many of these soon fell off, showing that they had not been properly fertilised. At the same time five short-styled plants were similarly treated, and they bore 116 flowers which ultimately produced only seven capsules. On another occasion 13 protected long-styled plants yielded by weight 25·9 grains of spontaneously self-fertilised seeds. At the same time seven protected short-styled plants yielded only half-a-grain weight of seeds. Therefore the long-styled plants yielded nearly 24 times as many spontaneously self-fertilised seeds as did the same number of short-styled plants."]

[262]

Jan 11th Another marrow radicle .35

(magnified in about same degree as last)

[data not transcribed]

Jan 12' 7° a.m far to left

 7° 53' new mark on iron

 8 45 moving down to left at tremendous rate

Tip of root injured from filament being affixed to it

[262v]

*(K) Botanische Zeitung 1867, p. 65. Several plants are known occasionally to appear produce flowers destitute of a corolla; but they belong to a different class of cases from cleistogamic flowers. This deprivation deficiency seems to result from the conditions to which the plants have been subjected, & partakes of the nature of a monstrosity. All the flowers on the same plant are commonly affected in the same manner. Such cases,, though they have sometimes been ranked with as cleistogamic, flowers, do not come within our present scope; see Dr Maxwell Masters, Vegetable Teratology 1869 p. 403.

[Forms of flowers, p. 3, n*: "'Botanische Zeitung,' 1867, p. 65. Several plants are known occasionally to produce flowers destitute of a corolla; but they belong to a different class of cases from cleistogamic flowers. This deficiency seems to result from the conditions to which the plants have been subjected, and partakes of the nature of a monstrosity. All the flowers on the same plant are commonly affected in the same manner. Such cases, though they have sometimes been ranked as cleistogamic, do not come within our present scope: see Dr. Maxwell Masters, 'Vegetable Teratology,' 1869, p. 403."]


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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 30 September, 2022