Thanks CD for answering his query about evolution.
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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.
Thanks CD for answering his query about evolution.
There is ‘some gradation in perfection with mammals in the mammery glands’. Discusses milk secretion in Echidna. Instances a fish in which the ova hatch in a sack on the male and the young feed on mucus secreted by the sack lining; ‘here … we see what might be the commencement of a simple mammery gland’.