RECORD: Darwin, C. R. n.d. Asa Gray / Summary continued. CUL-DAR16.297-298. 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.


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Summary continued Asa Gray

Of the Big-type vars. species presenting such vars. 36/1005 = 35/1000

such big vars themselves 49/1005 = 48/1000

Of the big-type vars. species presenting such vars. 31/917 33/1000

such big vars themselves 43/917 = 46/1000

Has Carex been added

Species marked Common. — 490

In genera with 5 sp & upwards. 295/1005 = 293/1000

In genera with 4 & downwards 195/917 = 212/1000

number of species having vars of any kind total number of species (Carex & Salix omitted) 162/1922 = about 1/12

number of species bearing "common" & having var. total number of common species

71/ 490 = about 1/7

or

number of "uncommon" species having vars. total number of "uncommon" species 91/1432 = about 1/16

number of "Common" species, having vars total number of common species 71/490 = about 1/7

N.B. a greater proportion of the "common species vary in large genera than in small, in about proportion of 1/6 to 1/10

[2v]

[calculations not transcribed]

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Summary on close species Asa Gray

Dr G. marked for me a list 146 [+] 14 [=] 160 species which were very closely allied in pairs, & some allied to 2 species: I have omitted this because it was difficult to get standard of comparison. —

There are omitting introduced species & such Salix & Carex

1922 species [-] 362 species belonging to single genera [=] 1561 which cd not have more

Now I divide these 1561 species into two groups.

Those with genera with 7 species & upwards

amt to Cares 745 [+] 131 [=] 876

Here we have 72 [+] 14 [=] 86

72/745 = 96/1000

Those with 6, 5, 4, 3, & 2 species

amt to 816

86 [+] 74 [=] 160

74/816 = 90/1000

Can they Asa Gray close sp be geographical vars? The Big-type vars do not seem to be so

another way of calculation more decidedly hostile

88 close species / 1005 species in genera of 5 & upwards} = 87/1000

58 close species / 556 in genera of 4, 3, 2 species = 104/1000

again hostile

103 close species / 1137 species in genera of 4 & upwards = 90/1000

43 close species / 424 species in genera of 3 & 2 species = 101/1000.


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

File last updated 7 September, 2023