Suggests the recipient catch the 4.12 train.

The Zoological Garden has only one old adult male of Limulus. When there were females, eggs were never observed.

Encloses a separate letter [formerly 7071] about AD’s scheme [for a zoological station].

Suggests AD be cautious [in his work]. "Caution is almost the soul of science."

Thanks ADB for Limulus.

Does Callithrix sciureus wrinkle the skin around its eyes when it screams? Do the eyes become suffused with moisture?

Has received [read?] CB’s two works [Chamois hunting in the mountains of Bavaria (2d ed., 1860) and Forest creatures (1871)] and has made use of them in his present book [Descent].

CB’s descriptions of the Tyrol make CD long to be "strong and young again to ramble over the mountains".

Is sending some books for the Linnean Society Library.

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

Thanks AR for specimens of fruit.

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

Requests the return of some plates sent in error.

Thanks CB for Transylvania [1865].

CD’s health has declined steadily. He must now be content to read about nature as described by CB and others.

No summary available.

Response to ARW’s MS on geological time ["The measurement of geological time", Nature 1 (1870): 399–401, 452–5].

Groans over [what is said about] man.

Asks JC-B to return copy of Duchenne [Mécanisme de la physionomie humaine (1862)] and sends some notes "as your former notes were of such extreme interest to me".