Discusses A. C. Ramsay’s article ["On the denudation of South Wales", Mem. Geol. Surv. G. B. 1 (1846)]. Mentions his own paper ["Volcanic phenomena in South America", Collected papers 1: 53–86]. Emphasises that sedimentary deposits are not ordinarily preserved.

Asks CL to address a letter to Charles Maclaren.

Discusses recent publication by David Milne on erratic boulders [Edinburgh New Philos. J. 42 (1847): 154–172].

Views of Bernhard Studer on foliation of gneiss in the Alps. Asks CL to tell Leonard Horner of Studer’s views.

Quotes from South America [p. 167] on the foliation of metamorphic rocks.

Comments on investigation of coral reefs by A. A. Gould, particularly the reefs around Tahiti. Mentions description of reefs of Tahiti by W. Forbes.

Hooker’s view of work by C. J. F. Bunbury.

Has received copy of CL’s Principles [7th ed.].

Comments on reading Annales des sciences naturelles.

David Milne’s and Robert Chambers’ views on Glen Roy.

Mentions sales of South America.

Describes visit to his father at Shrewsbury.

Comments on correspondence between CL and Whewell [concerning university reform].

Criticises S. G. Morton’s "Hybridity in animals" [Am. J. Sci. 2d ser. 3 (1847): 39–50, 203–12].

Discusses David Milne’s Glen Roy paper ["On the parallel roads of Lochaber", Trans. R. Soc. Edinburgh 16 (1849): 395–418]. Rejects Milne’s theory that outlet of Glen Roy is blocked by detritus. Impressed by Milne’s discovery of an outlet at the level of the second shelf. Believes this strengthens theory that lakes were formed by glacier blocking Glen Roy. Offers arguments against glacier theory.

Discusses enclosed figures on elevation of terraces in several Scottish glens as surveyed by William Kemp and David Stevenson. Comments on Robert Chambers’ view of the terraces. Mentions a letter on the terraces, originally written for publication, which he has asked Robert Jameson [editor of the Edinburgh New Philos. J.] to destroy.

Comments on apology by Chambers for using some of CD’s material without acknowledgment in discussing Glen Roy. His opinion of Chambers’ book [Ancient sea-margins (1848)].

Comments on Ann Susan Horner’s escape in a dangerous incident at sea.

Compares addresses by William Buckland and CL, delivered at recent meeting of the Geological Society.

Discusses the views on Glen Roy in Chambers’ Ancient sea-margins [1848].

Speculates that Chambers wrote Vestiges [of creation (1844)].

Congratulations on CL’s knighthood.

Mentions illness of Emma Darwin.

Comments on CL’s Second visit to the United States [1849].

His water treatment by J. M. Gully.

CD’s contribution ["Geology"] to J. W. Herschel’s Manual of scientific enquiry [(1849), Collected papers 1: 227–50].

Discusses CL’s Second visit to the United States [1849]. Corrects CL’s error regarding location of Megatherium finds.

Discusses effect of subsidence and elevation on deposits. Cites examples along coasts of South America and Wales. Proposes theory to explain thickness of deposits in south Wales.

Asks CL’s opinion of his theory of "craters of elevation" described in Volcanic islands.

Mentions CL’s comparison of Mississippi beds to the Pampas.

Comments on Poulett Scrope’s views on the separation of basalt and trachyte.

Describes his cirripede work.

Discusses CL’s refutation of CD’s concept of "craters of elevation" and CL’s new concept of "craters of denudation". Mentions examples of such craters. Admits that his own concept of these craters was unsatisfactory. Urges CL to publish article ["On craters of denudation", Q. J. Geol. Soc. Lond. 6 (1850): 207–34].

Criticises Élie de Beaumont’s view of a right angle junction of a stream of lava and a dike.

Mentions his misgivings in voting to recommend J. D. Forbes for Royal Medal.

Notes Daniel Sharpe’s work on mica schist.

Discusses J. D. Dana’s Geology [1849]. Pleased that the part on corals confirms his views [Coral reefs (1842)]. Discusses Dana’s observation that in Sandwich Islands lava streams often join dikes at right angles with no cone. Retracts earlier denial of this possibility. Criticises Dana’s view of Australian valleys.

Continues discussion of Dana’s Geology [1849]. Comments on dikes of Hawaiian volcanoes and Dana’s view of craters of denudation. Compares role of sea and rivers in forming valleys. Criticises Dana’s treatment of CD’s account of coral reefs.

Discusses CL’s paper, "On craters of denudation" [Q. J. Geol. Soc. Lond. 6 (1850): 207–34], which "will be a thorn in the side of É[lie] de B[eaumont]". Notes evidence from Galapagos overlooked by CL. Mentions other examples of craters.

Comments on CL’s Anniversary address [Q. J. Geol. Soc. Lond. 6 (1850): xxvii–lxvi]. Notes CL’s criticism of R. I. Murchison’s catastrophism.

Asks whether there are Lower Cretaceous beds in Scandinavia. Thinks Leopold von Buch must have neglected them.