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[Awaiting summary]
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Thanks JM for sending Drosera specimens.
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Sends CD passages from A. S. Taylor's book [On poisons in relation to medical jurisprudence and medicine, 2d ed. (1859)], citing smallest portions of poisons that are chemically detectable. "Drosera beats the chemists hollow."
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Son [Leonard] ill with scarlet fever. Also Mrs Darwin. Intends to give up work on Drosera until Variation is done.
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CD may be interested in a reference to a method of detecting 1/195000 of a grain of sodium chloride. Also, on Drosera, suggests it would be interesting to try substances such as gun-cotton, in which nitrogen is in very different states from a salt of ammonia.
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Has not himself experimented with delicacy of tests but sends several illustrations of what other authorities have done. Reference to James Marsh's test for arsenic and that of Ashley Paston Price for iodine.
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Discusses letter from A. W. v. Hofmann concerning solution of iodine in water.
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Walter White [Asst.-Sec. and Librarian, Royal Society] has introduced EC to Richard Kippist of the Linnean Society, who has made little progress toward accepting Origin.
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Asks him to thank A. S. Taylor for note.Describes experiments on Drosera. Discusses reviews of the Origin. By far the best is by Asa Gray. Discusses plans for new edition of Origin.
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Thanks for information about the weight of water.Describes experiments on Drosera.