Reports on the snakes he collected in the Galapagos.

Sends his photograph.

Asks for any information of well-marked sexual differences in snakes, batrachians, or lizards. The rattlesnakes at the Zoological Garden differ considerably in colour.

Thanks AG for information.

Asks AG for details of variation in patterning of the banded snake.

Sends some questions on secondary sexual differences of fishes [missing], which he hopes AG will look over.

Invites AG to come to Down.

Encloses queries on sexual differences and nest-building habits of fish.

Thanks for answer to questions.

Has analogous questions on reptiles that he will send to AG. The subject interests him, but CD must try not to fall into his common error of "being too speculative".

Sends a list of queries for AG.

Asks whether AG can supply specimens for illustrations [for Descent]. Hopes Mr Ford will do the drawings.

Is "astonished & deeply grieved" at loss [of AG’s wife].

Thanks AG for full answers to queries.

Delighted Mr Ford will undertake drawings [for Descent]; comments on some illustrations he would like.

Delighted with proofs of illustrations [for Descent]. Hopes AG is pleased with them, as they illustrate facts given on his authority.

Invites AG to Down for a weekend with A. Newton, R. Swinhoe, and Hooker.

Expresses his "unbounded admiration" for Mr Ford’s woodcuts [for Descent]. Thanks AG for his kindness.

Asks AG to identify the species of Triton Mr Ford has drawn.

AG’s help has turned CD’s chapter on fishes and reptiles from "much the worst" into "one of the best" [in Descent].

Invites AG to stay at Down. Winwood Reade and, he hopes, Hooker and Robert Swinhoe will be there.

Sends some questions [missing].

Bad health has prevented him from working for six weeks.

Thanks AG for answer about Galaxias.

Asks him to mention questions about the ears of Mus to other naturalists.

Will send another copy of Chauncey Wright’s pamphlet [Darwinism (1871)].

AG has proved Ceratodus to be a "wonderfully interesting creature" ["Descripton of Ceratodus", Philos. Trans. R. Soc. Lond. 161 (1871): 511–72].

Encloses a testimonial for AG [in support of his application for a promotion at British Museum].

Does he agree with Carl Gegenbaur’s paper on the limbs of fish [Jenaische Z. Naturwiss. 5 (1870): 397–447]?

Asks what caused G. R. Gray’s sudden death.

Is the horned toad of Oregon a batrachian or a lizard?

Hopes AG will be promoted in the British Museum.

Rejoices at AG’s appointment [as Assistant Keeper at the British Museum].

Thanks AG for Popular Science Review containing his article [on Ceratodus, 11 (1872): 257–66]. CD had already read it with great interest.