Summary

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

Summary

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".

Summary

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

Summary

Discusses books returned

and invites him to Down for a few days.

Summary

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.

Summary

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

Summary

Remarks on geographical divisions of the flora of the Southern Hemisphere.

JDH beginning Galapagos plants. Value of studying insular floras with respect to inquiries about adaptation of species.

Summary

Thanks for information for Ehrenberg.

Summary

Dicussion of some specimens from the Beagle voyage.

Summary

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

Summary

Island floras; relationships with mainland. Ranges of species in mundane genera.

Galapagos plants one-third done.

Summary

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.

Summary

Regrets the delay in sending copies of his paper.

Summary

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.

Summary

Thanks for information on Malden Island. Comments on its plants and their relationship to the Galapagos flora. Discusses the flora of Oceania. Gives his opinion on the extent of the uniformity in species and forms amongst South Sea Islands. Large genera are more widely diffused and have a larger proportion of species with wide ranges.

Seeks advice on expense of preparing plates [for Flora Antarctica].

Summary

Advice to JDH on problems of printing and publishing.

Remarks on differences of species between islets of Galapagos group.

Summary

[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".

Summary

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

Has received JDH’s infusorial specimens for Ehrenberg.

Summary

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.

Summary

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.