Summary

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].

Summary

Arranges to call on Wednesday but declines a breakfast invitation, as his stomach is so particular that he is afraid to go about before eating.

Summary

Encloses a letter to be forwarded to Sven Lovén, asking for a specimen of a remarkable cirripede. Still anxious to receive JGF’s specimens.

Summary

To make his monograph on cirripedes complete, would appreciate a specimen of Alepas squalicola, which CD is sure is a new genus.

Summary

Asks if Mr Salt could arrange to invest up to £30,000 on his behalf.

Summary

Has sent all the fossil pedunculated cirripedes in the Copenhagen collection, together with a letter from Johannes Steenstrup concerning changes he believes are needed in the descriptions.

Summary

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.

Summary

He is willing to wait until the end of February 1850 for Mr Salt to find him an opportunity to invest up to £30,000.

Summary

Has had his portrait taken;

is anxious about scarlet fever among his children.