Recognition of colour by animals.
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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.
Recognition of colour by animals.
Proportion of sexes in pigeons, pigs, and pheasants.
Sexual preferences of females.
Daisies.
A tame rabbit with a litter of 18.
Effects of first impregnation on litters from subsequent pregnancies.
Power of selective breeding to produce different varieties.
‘Your mother ought indeed to feel proud that she had two sons such true naturalists as you and your brother [John Jenner Weir].’