Approves of the idea of a system of allotments for the agricultural population if they are near to their cottages. Reluctant to attend a meeting of Suffolk proprietors as his views differ greatly from most of them, particularly in relation to the Corn Laws.

No summary available.

Discusses microscopic examination of rock specimens taken from Pampas deposit and from Chilean tuff. Says he finds organic remains only in the tuff.

Queries on ratios of species to genera on southern islands. CD’s observations on distribution of Galapagos organisms, and on S. American fossils, and facts he has gathered since, lead him to conclusion that species are not immutable; "it is like confessing a murder".

C. G. Ehrenberg would like some earth from Galapagos, Tierra del Fuego, and the Falklands; wishes to hunt for Infusoria.

Thanks for information for Ehrenberg.

Has just completed Volcanic islands.

Sends queries on Galapagos flora in particular and island floras in general; also on relationship of wide-ranging species to wide-ranging genera.

Regrets the delay in sending copies of his paper.

Regrets the delay in sending copies of his paper.

Affinity of Galapagos with nearest Pacific islands. Relationship between ranges of species in time and space. Comparison of Malden Island and Galapagos plants. Affinities of Oceania plants with continental floras.

Advice to JDH on problems of printing and publishing.

Remarks on differences of species between islets of Galapagos group.

Asks JDH to forward publishing information to J. E. Gray.

Has received JDH’s infusorial specimens for Ehrenberg.

Writes to correct a statement made in his 1837 paper "On the formation of mould" [Collected papers 1: 49–53]. He should have said that marl was put on the field 30 years ago, not 80. Observations made on a visit to the field showed that worms had undermined the marl spread on the field at a faster rate than previously reported.

Thanks for JDH’s interesting details about the Galapagos.

Clarification of CD’s query about the relationship between the range of a genus and the ranges of its constituent species.

Thanks for information on printing charges

and for clarifying "typical forms".

In a few days CD will go away for six weeks.

Asks if J. E. Gray has returned [printing] estimates for Zoology.

Henslow has some Galapagos plants which he forgot to forward to JDH.

Arrangements for Emma’s return to Down.

CD has been "wonderfully strong".

Encloses letter from Ehrenberg [758] about Infusoria.

Intends to visit Kew.

Health and weather permitting, CD proposes to visit Kew.

Encloses letter from Ehrenberg [762], who wants information on deep-sea soundings from JDH’s voyage, and on isolated islands.