RECORD: Darwin, C. R. n.d. Ch 4 Discussion on Big Genera. CUL-DAR45.93. 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'.
[93]
Ch 4. Discussion on Big Genera
Be cautious, probably almost every species has once been "common"; but at least variation later place when that at period when any species is common;
[93v]
So much concurrence that species in large genera closer, than in small implies intermediate extinction — if every small genera has been large is implied.— If it has been extinction it wd probably be common to genera & class.—
Citation: John van Wyhe, ed. 2002-. The Complete Work of Charles Darwin Online. (http://darwin-online.org.uk/)
File last updated 24 October, 2022