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The Charles Darwin Collection
The Darwin Correspondence Project is publishing letters written by and to the naturalist Charles Darwin (1809–1882). Complete transcripts of letters are being made available through the Project’s website (www.darwinproject.ac.uk) after publication in the ongoing print edition of The Correspondence of Charles Darwin (Cambridge University Press 1985–). Metadata and summaries of all known letters (c. 15,000) appear in Ɛpsilon, and the full texts of available letters can also be searched, with links to the full texts.
Asks CD’s opinion of his suggestion that a distinctive mark of species may be the duration of pregnancy, incubation, or germination.
Sends some articles on mammals [possibly "On the relations of the orders of mammals", Proc. Am. Assoc. Adv. Sci. 19 (1870): 267–70, and "On the characteristics of the primary groups of the class of mammals", ibid. 20 (1871): 284–306].
He is a disciple, convinced of CD’s theory of evolution and of natural selection.
In the U. S. almost all refuse to recognize natural selection.
Has finished seven chapters of revision of Origin [6th ed.] despite poor health. Asks JM’s opinion on a glossary of scientific terms. Encloses text for advertisement.