CD wants Lepadidae drawings [for Fossil Cirripedia] harder, with lines of growth more distinct; he wants no shading or similarity to lithography, which he thinks has harmed natural history. He realises that mutilated specimens may make accuracy difficult.

Thanks AH for specimens of cirripedes. Believes all species of Lithotrya bore.

Requests permission to include foreign species in Fossil Cirrpedia (1851). Asks whether sponges arrived. Has not yet heard from Pearce about Pollicipes concinus.

Asks to borrow a cirripede specimen from collection of Frederick Dixon.

Discusses possibility of providing B. J. Sulivan with a vessel for fossil hunting in Patagonia.

Asks RO to ask Mrs Dixon about borrowing cirripede specimen.

Details of his continuing water-cure regimen.

The Palaeontographical Society will give him only one plate for foreign species. Work should stop until he knows how many will fit in. He must know what progress has been made.

Thanks him for additional fossil cirripede specimens.

Agrees to reduce rent on farm because of bad times.

Mentions AH’s ["On the boring of the Mollusca into rocks", Ann. & Mag. Nat. Hist. 2d ser. 2 (1848): 225–48]. Discusses anatomy and habits of Lithotrya.

Thanks JGF for geological information.

Steenstrup’s cirripede specimens have been of great use and interest. CD has now described 33 fossil pedunculated cirripedes.

Asks for whatever numbers, since 1845, of the Journal [of the Royal Geographical Society] he, as a Fellow, is entitled to receive gratis.

Describes progress in illustration of fossil cirripede specimens. Thanks for answers to questions. Comments on hermaphroditism. Describes his discovery of parasitic male cirripedes.

Encloses a letter from J. D. Hooker [see 1257], thinking that WJH would like to see it.

Urges dispatch on illustrations [for Fossil Cirripedia]; CD’s MS has been ready for some time and all depends on JdeCS. Suggests a way to hasten progress.

Discusses his account.

Discusses depths at which ripple-marks appear on sea-floor.

Personal and social comment.

Mentions receiving Agassiz’s Lake Superior [1850].

CD is pleased with the drawings for Fossil Cirripedia but wants a few corrections which he would like very soon.

On Himalayan stratigraphy. Believes JDH’s observations of glacial action are the first ever done east of Urals.

Barnacles and the species theory; impressed with variation.

Effect of CD’s species sketch on JDH’s view of willow systematics.

Thanks LA for presentation copy of his book, Lake Superior [1850].

Comments on species of cirripedes sent by LA and A. A. Gould.