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.

Sorry to hear of CD’s poor health.

Is hard at work examining Ceratodus.

Encloses discussion of Mus species with functionally prehensile tails.

Encloses argument against freshwater fish entering the sea.

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].