Darwin's health and his father's death have delayed his answer. Describes J. M. Gully's water-cure. Hooker's Galapagos papers [Trans. Linn. Soc. Lond. 20 (1851): 163–233] have excellent discussion of geographical distribution, but why no general treatment of affinities? Darwin's views on clay-slate laminae. Turmoil in Royal Society between naturalists and physicists.
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