Offers to send Ascidia specimens of Beagle voyage. Describes some of them.

Hopes THH will review his book [Living Cirripedia, vol. 1] which has been published for a year with no notice taken of it except briefly by Dana.

Discusses Limulus-like larva. "I have become a man of one idea.– cirripedes morning & night."

Asks THH question on flow of glaciers after ice has been fractured and fragmented.

CD had to leave Royal Society lecture [joint paper by THH and J. Tyndall, "On the structure and motions of glaciers", Philos. Trans. R. Soc. Lond. 147 (1857): 327–46] before the end because of headache.

THH comments on G. A. Brullé’s paper ["Researches upon the transformations of the appendages of the Articulata", Ann. & Mag. Nat. Hist. 13 (1844): 484–6].

On classification and possibilities of a scientific morphology and zoology. CD’s "pedigree business" is important for physiology but has nothing to do with pure zoology any more than human pedigree has to do with the census. Zoological classification is a census of the animal world.

THH’s catalogue [THH and R. Etheridge, A catalogue of the collection of fossils in the Museum of Practical Geology (1865), part published in 1857] best résumé he has seen of science of natural history. On classification he is not quite sure that he wholly goes along with THH. Encloses a few criticisms of THH’s preface.[enclosure survives as copy only].

K. E. von Baer’s view of the air bladder of fishes.

Serial homologies in the Mollusca. Gives instances of repetition of homological parts in Radiata.

Has just finished Origin. CD has demonstrated a true cause for the production of species.

CD has loaded himself with unnecessary difficulty in adopting natura non facit saltum.

Murray has sold out Origin; wants a new edition immediately.

Asks THH to check whether Geoffroy de St Hilaire is correct [form of name].

Would be grateful for THH’s impressions on the truth of natural selection.

Sends enclosure [unspecified].

Reminds THH to mention [German] translation [of Origin] when he writes to R. A. von Kölliker.

Relates anecdote concerning the blind Henry Fawcett and the Bishop of Oxford; Fawcett proclaimed, within the other’s hearing, that the Bishop had not read the Origin.

Announces great ally for CD: K. E. von Baer "worth all the Owens & Bishops that ever were pupped". Quotes Baer: "J’ai énoncé les mêmes idées que M. Darwin", but based only on zoological geography.

Invites Mrs Huxley and the children to spend a fortnight at Down.

MS of Chauncey Wright’s review has not yet arrived.

[P.S. missing from original.]

Against all predictions his Edinburgh lecture was well received [Evidence as to man’s place in nature (1863)].

Took his old line about problem of infertility of hybrids as a test of CD’s views.

Report [from a newspaper] not quite right about what he said, but they have not refuted his statement that some form of progressive development theory is certainly true, nor that man and the apes come from same stock. Owen has gone in for progressive development in second edition of the Palaeontology [1861].

The Witness attacks THH’s lecture.

Assures CD he spoke more favourably of his doctrines than the reports show.

Agrees with CD’s arguments on sterility of hybrids and predicts physiological experiments will produce physiological species sterile inter se. Has come even closer to CD’s view especially since Primula paper. Will soon be more Darwinian than CD.

Returns a letter, which, when it is published, he believes will make readers take up THH’s lectures in a more impartial spirit.

Glad to receive CD’s pat on back for address.

Wants to know what CD thinks of the argument on geological contemporaneity.

On his poor health.

The BAAS meeting at Cambridge was exhausting.

Owen came to attack him but was beaten; his paper fell flat.

A "society for propagation of common honesty in all parts of the world" was established at Cambridge [THH’s "Thorough Club"?].

Thanks for a contribution ["On the so-called ""auditory-sac"" of cirripedes", Nat. Hist. Rev. (1863): 115–16; Collected papers 2: 85–7]. Is sending a proof.

This year’s lecture to working men to be devoted to CD’s book.

Sends first three of his Lectures to working men [on our knowledge of the phenomena of organic nature (1863)]. Does not intend them to be widely circulated.