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].
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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.