RECORD: Darwin, C. R. n.d. Boreau / Genera with 5 species & upwards. CUL-DAR16.204b. 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-DAR16 contains calculations and tables for Darwin's 'big book' Natural Selection F1583.
Boreau, Alexandre. 1840. Flore du centre de la France; ou description des plantes qui croissent spontanément dans la région centrale de la France, et de celles qui y sont cultivées en grand, avec l'analyse des genres et des espèces. 2 vols. in 1. Paris: Roret.
[204b]
Boreau Centre du France (1840) (167 species omitted)
[data not transcribed]
[204bv]
In the genera having 5 species & upwards 109 out of 679 species present vars = 160 in a thousand
--- having 3 species or less 66 out of 625 ― = 105 in a thousand
omit / (having 4 species 14 out 116 --- = 120 in a thousand
(having 4 & less ― 80 ― 741 ― = (nearly) 108 in a thousand)
Now if we consider the number of Varieties themselves
in the large genera with 5 & upwards then 153/679 = 225/1000
in the small genera with 3, 2, 1 species then 100/625 = 160/1000
Again in the large genera the proportion of varieties to the varying species in
vars 153 : species having them 109 :: small genera 100 : X = 71.2. But the real number is 66 : hence
[calculations not transcribed] = proportion vars 92.5; but the real number is 100, therefore the small genera, which have species varying present rather too many varieties.
Citation: John van Wyhe, ed. 2002-. The Complete Work of Charles Darwin Online. (http://darwin-online.org.uk/)
File last updated 7 September, 2023