Parallel quotations from Benjamin Franklin and Descent about absorption of heat by different colours; applies to winter and summer plumage of birds.
Reasoning power in dogs.
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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.
Parallel quotations from Benjamin Franklin and Descent about absorption of heat by different colours; applies to winter and summer plumage of birds.
Reasoning power in dogs.
Arrangements for the plates for Expression and charges to be made for them to foreign editors.