Discusses intestinal worms among humans.

Comments on origin of human races.

Can hardly believe he made a mistake in specimens sent to HD. Recopies numbers in case he transposed them. [Has to do with lice taken from a specimen of aperea and put into spirits during Beagle voyage.]

Thanks Horner for his letter [about Volcanic islands].

Discusses craters of elevation with respect to the views of Leopold von Buch and Élie de Beaumont. Compares Lyell’s views to those of continental geologists. Mentions reading A. D. d’Orbigny [Voyage dans l’Amérique méridionale (1835–47)].

Encloses note from Emma to Mrs Horner, inviting the Horners to visit Down.

Asks about CL’s new book [Travels in North America (1845)].

Discusses views of A. D. d’Orbigny on elevation.

Mentions reading W. H. Prescott [History of the conquest of Mexico (1843)].

No summary available.

Has read CHS’s paper, "Original population of America" [Edinburgh New Philos. J. 38 (1844–5): 1–20], and is eager to know reference for the account of a "ruined city in the Caroline Group", indicating that the land has subsided. Refers to his own subsidence hypothesis in his work [Coral reefs].

Discusses extract sent by CHS dealing with island of Pouynipéte. Agrees account of island by Lloghtsky [Johann Lhotsky] is suspect.

Comments on view that former migration of animals, plants, and man was by continental extensions now submerged.

Discusses EWB’s application for a position and his qualifications.

Remarks on fossils described in A. D. d’Orbigny’s Voyage dans l’Amérique méridionale.

Asks CL whether he has talked with John Murray concerning 2d ed. [of Journal of researches].

Mentions conversation with Hugh Cuming about South American shells. Has had G. B. Sowerby (elder) look at some specimens.

Is at work on second edition of Journal of researches.

Hopes to finish geology of the Beagle by autumn.

Hooker gives "a wonderful account" of Galapagos plants.

Sends the first part of Journal of researches [2d ed.]. Explains his dedication of book to CL. Describes revisions.

Has received CL’s book [Travels in North America, 2 vols. (1845)].

Comments extensively on CL’s book [Travels in North America (1845)]. Lyell’s views on slavery, the clergy, education, and coalfields. Has difficulty in tracing Lyell’s course. Comments on geological portions, especially CL’s comparisons of living and fossil organisms to those of South America and Tasmania; animal formation of carbonic acid and effects of vegetable decay; Indians’ use of lumber. Discusses water-borne transportation of wood, fruit, and seeds. Notes distribution of Arctic flora.

Discusses the power of land covered with snow to radiate heat.

Criticises CL’s discussion of slavery [in Travels in North America (1845)]. A review of CL’s book is in Gardeners’ Chronicle.

Mentions John Lindley’s views on carbonic acid gas and extinction;

refers to the discussion of multiple and single creations in Humboldt’s Kosmos.

The origin of volcanic craters of elevation.

There is a popular demand for a new edition of Principles.

Praises palaeobotanical work of C. J. F. Bunbury.

Discusses American Negroes and their parasitic lice. Henry Denny’s need for lice specimens.

Discusses effects of racial crosses in man.

Describes his trip to Yorkshire.

Comments on Sedgwick’s review [of Vestiges of creation].

Mentions Humboldt’s Kosmos. Criticises Humboldt’s geology.

Cannot find two specimens of S. American fossil shells.

Thanks for his note; as soon as CD knows how many Cordillera Tertiary fossil shells require illustration he will make arrangements for GBS jr to begin.

Returns copy [of J. Hortic. Soc. Lond.]. Mentions article by William Herbert ["Local habitation and wants of plants", J. Hortic. Soc. Lond. 1 (1846): 44–9].

Asks to visit RO to talk about mammifers of the [Rio] Plata.

Comments on forthcoming edition [7th (1847)] of CL’s Principles. Mentions other books relevant to CL’s needs by Hooker, H. G. Bronn, Edward Forbes, and J. G. Kölreuter. Discusses his own books on volcanoes and the geology of S. America.

Mentions expected visit to Down by the Lyells.

Discusses proposed survey of Glen Roy. Mentions Glen Roy theories of Agassiz and William Buckland. Includes a memorandum calling for a careful survey of the parallel roads of Glen Roy. Mentions M. A. Bravais ["On the lines of ancient level of the sea in Finmark", Q. J. Geol. Soc. Lond. 1 (1845): 534].