Sends his paper on earthquakes [(1840), Collected papers 1: 53–86]. Now sets less value on theoretical reasoning in geology than when he wrote it.

Discusses chapter [6] on cleavage and foliation in South America. Notes especially cleavage where two series cross and cleavage as basis of foliation in metamorphosed rock. Notes foliation in rocks that have been liquefied by heat. Mentions case described in his "Geology of the Falkland Islands" [Collected papers 1: 203–12]. Discusses relationship of cleavage to beds. Speculations on association between grauwacke and clay-slates.

Explains that he cannot serve as President of the Zoological Section at the BAAS meeting [1858].

Preparation for his address with particular concern that JP approve the part relating to [Adam] Sedgwick. Urges JP to sit at dinner with him as a sign of approval of the award [of the Copley Medal].

Admits his own dismay regarding the efforts of the younger geologists and zoologists to obtain the Copley Medal for CD on the grounds of the Origin and his anxiety about the next year’s award.

Thanks JP for his book Vesuvius [1869].

Thanks for note concerning JP’s new book [Geology of Oxford (1871)].

Regrets he cannot visit Oxford.

Comments on sketches in letter from JP [9360].