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.

Asks MEL to translate page of paper by Sven Lovén ["Ny art af Cirripedia", Ofvers. K. Vetensk. Acad. Forh. Stockholm 1 (1844): 192–4]. CD is "dreadfully interested" in the barnacles [Alepas squalicola] described.

Hopes Charles Lyell’s "craters of Denudation" prosper.

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

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

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

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.

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.

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.

Has had his portrait taken;

is anxious about scarlet fever among his children.

Inquires about parcel of cirripede specimens lost in transit. Asks him to tell Steenstrup about the loss.

Asks to borrow specimen of Pollicipes from the Chalk.

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.

Comments on JDD’s book [Geology (1849)]. Is sending copies of various geological papers. Their agreements and differences on coral reefs, volcanic geology, denudation, and subsidence.

Comments on Robert Chambers’ book [Ancient sea-margins (1848)].

Asks to borrow cirripede specimens.

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.

Comments on AC’s experiments on Phlox and Mimulus.

Discusses his accounts.

Discusses the new genus, Alcippe, described by AH ["Notice of the occurrence on the British coast of a burrowing barnacle", Ann. & Mag. Nat. Hist. 2d ser. 4 (1849): 305–14]. Comments on Lithotrya, Clitia, and Anatifa. Discusses cirripede larvae. Asks which Mollusca specimens AH wishes to borrow.

CD is distressed that JS’s shipment of fossils has been lost: "of all the Cirripedes in the world, I most wish to dissect the Alepas squalicola". Welcomes JS’s offer to send some northern recent species. CD finds great confusion in the current classification of cirripedes in British museums; different genera are made into one species, mere varieties are made into distinct species. If JS would give him some named common northern species, it would be of great assistance.

Thanks JSH for information and suggestions on benefit clubs,

and for a shipment of fossil cirripedes.

J. B. Innes is greatly obliged for JSH’s letter. JSH’s observation of chalk flints strikes CD as "very curious".