Asks that A. d’Orbigny’s geological map of S. America be sent to him with a card of the Society’s evening meetings.

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".

Discusses sending HD lice specimens. Asks him to check with G. R. Waterhouse.

Discusses books returned

and invites him to Down for a few days.

Delighted to be able to contribute Infusoria to ED’s "great countryman Ehrenberg". Includes a list of eight substances from his collection described in detail, which Ehrenberg might find useful in his researches.

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.

Dicussion of some specimens from the Beagle voyage.

Inquires about the habits of a litter of foxhounds whose sire was particularly good at recovering the scent in paths or roads.

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.

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.

[With the notation "If not there to be forwarded by favour of Prof. Liebig" on the address.] "I am very glad to hear that you are going to edit a German Geological Journal".

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

Has received JDH’s infusorial specimens for Ehrenberg.

Gives information on the climate around the Falkland Islands and directs Wood to write to Captain Sulivan.

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.

Sends samples likely to contain Infusoria and some that Hooker collected in Antarctic regions.