The Complete Work of Charles Darwin Online

RECORD: Darwin, C. R. 1869.07.04. Gradation / In Blue Salvia. CUL-DAR45.165. Edited by John van Wyhe (Darwin Online, http://darwin-online.org.uk/)

REVISION HISTORY: Transcribed by Christine Chua and edited by John van Wyhe 10.2022. RN1

NOTE: See record in the Darwin Online manuscript catalogue, enter its Identifier here. Reproduced with permission of the Syndics of Cambridge University Library William Huxley Darwin. The volume CUL-DAR45 contains notes for Natural selection chap. 4 'Variation under nature'.

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July 4/1869 —

Gradation

In Blue Salvia — the 2 anther-cells of each stamen very remote & one modified into quite new organ — In Garden sage the 2 cells considerably remote, — one hidden & thus protected, the other lying in open tube of corolla, & about half the size of the other. This exposed cell is so placed as to have its pollen removed by entering insects, but it likewise serves to bring down other cell out of hood — See Hildebrand paper & ask Hooker, whether other more intermediate cases, where both anther-cells a little remote & perfect & both exposed or protected

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