Thanks CD for specimens which show that an abnormality in one genus is normal in another, which bears on CD’s views on descent.
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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 specimens which show that an abnormality in one genus is normal in another, which bears on CD’s views on descent.
The ovule of Primula is amphitropous or what J. Georg Agardh calls apotropo-amphitropous [see Theoria systematis plantarum (1858), tab. 24, fig. 5–6].
Difference in plumage of Ardeola, a species of heron, in summer and winter. [See Descent 2: 190.]
The niata is a very good case because the race is well established and must originate in South America. There is a description of the head by [Richard] Owen in the Descriptive catalogue of the osteological collection of the College of Surgeons.
Has observed modifications in the skeletons of rabbits, ducks, poultry, and pigeons. There is an extract about modifications in pigeons in the first chapter of Origin. Encloses a woodcut of crested or polish fowls; there is a change in the brain as well as in the exterior bones.
Thanks for information on Primula ovules. From what DO says the pollen-tubes ought to find their way to the micropyle.
Asks CD whether he knows of "anything worth looking at" that has appeared abroad on his theory of the origin of species.