Encloses printed letter from Land and Water in which he proposes a hypothesis that explains how soaring birds can stay aloft by expelling air from their lungs.
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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.
Encloses printed letter from Land and Water in which he proposes a hypothesis that explains how soaring birds can stay aloft by expelling air from their lungs.
Adds a point to his previous letter regarding the buoyancy of birds and their soaring capacity.
Discusses further his theory relating to the soaring capacity of birds.
Mentions hybrids produced by various crossings of game-birds.