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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.
He will repeat the experiments in which CD found that formic acid vapour killed seeds [see 8866]. John Lindley describes effects of other acids on germination.
He has tabulated the large amount of variation in English Ophrys apifera.
CD has clarified the way to conduct the formic acid experiment.
A hasty answer to CD’s letter [8987] of 25 July. Mentions Dr Osler’s observations on behaviour of colourless blood corpuscles in solutions of sodium and potassium salts of same strength.
Reports in detail on her experiments with Drosera. Finds she was mistaken in thinking D. filiformis captured only small insects.
His preliminary results with formic acid show that it inhibits germination of several kinds of seed. It also inhibits growing of mildew, which he speculates may facilitate germination.
Has three common garden plants of which he needs to know correct names; will send specimens as soon as he hears JDH is back.
JVC’s travel plans in England. Hopes to visit CD.
Gives some observations on ponies’ becoming white in winter;
on skin pigmentation and the effects of heat;
on the bristling of the hair in man.
