RECORD: Darwin, C. R. [1878].09.06. Tropaeolum majus / Draft of Cross and self fertilisation. CUL-DAR209.7.125. Edited by John van Wyhe (Darwin Online, http://darwin-online.org.uk/)

REVISION HISTORY: Transcribed by Christine Chua and edited by John van Wyhe 8.2022. 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 volumes CUL-DAR209.7-8 contain notes on heliotropism (phototropism) for Darwin's book Movement in plants (1880).


[125]

Older seedling Sept 6th (Kept dark till now)

Pot slewed round (Used)

[data not transcribed]

[125v]

often very closely [5 words excised]

exposed to the same conditions which as we shall hereafter is a very important circumstance— it is not at all surprising that the difference between them in the later generations should have somewhat decreased. It is on the contrary an astonishing fact, that the crossed plants should have beaten been victorious even in to a slight degree over the self-fertilised plants of the later generations.)

(29) (The much greater constitutional vigour of the crossed plants compared with the self-fertilised ones plant was proved on five occasions in various ways; namely

[Cross and self fertilisation, pp. 55-6: "When, however, we remember that the self-fertilised and crossed plants are all descended from the same mother-plant, that many of the crossed plants in each generation were related, often closely related, and that all were exposed to the same conditions, which, as we shall hereafter find, is a very important circumstance, it is not at all surprising that the difference between them should have somewhat decreased in the later generations. It is, on the contrary, an astonishing fact, that the crossed plants should have been victorious, even to a slight degree, over the self-fertilised plants of the later generations."]


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

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