RECORD: Darwin, C. R. n.d. Omitting Carex & Salix in the following calculations. #.19. Edited by John van Wyhe (Darwin Online, http://darwin-online.org.uk/)
REVISION HISTORY: Transcribed by Christine Chua and edited by John van Wyhe 3.2023. 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-DAR15.2 contains calculations and tables for Darwin's 'big book' Natural Selection F1583.
[19]
Omitting Carex & Salix in the following calculations there are 66 genera having one or more vars species no presenting vars; but the total number (with same omission) is 687, to that proportion is 66/687 = 1/10
Now of these 66 genera exactly half or 33 have "close species" in Dr. Gray M. S. list.
On other hand
The number of genera with close species is 115, ∴ 115/687 is proportion with close species, or more properly as genera with single species must be omitted is 115/316
The number of genera with "close species" is 115; according to general scale 1/10 of these ought to have close vars, but in fact 33/115 have = 1/3.5 have vars, which shows to demonstration that genera with "close species" & vars. are connected.
Citation: John van Wyhe, ed. 2002-. The Complete Work of Charles Darwin Online. (http://darwin-online.org.uk/)
File last updated 7 September, 2023