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