Questions CD’s view in Origin that domestic dogs are not descended from a single stock. Occasional crossings of domestic stock with wild species could explain cases of reversion towards wild specific forms. CD’s views on hybridity do not then have to be contradicted in constructing an ancestral stock.

Comments on pp. 201, 211, and 218 [of Origin].

Thanks CL for his decision to accept CD’s "doctrine of modification" [in Elements of geology, 6th ed. (1865)]. Believes it "morally impossible that investigators of truth, like you and Hooker, can be wholly wrong". Does not think CL’s decision will injure his works.

Thinks CL overrates importance of multiple origin of dogs.

Mentions sending copy of Origin to Herschel. Asks CL about Herschel’s reaction.

Sales of Origin.

Discusses revisions for second edition. Mentions possible French translation.

Views of Quatrefages [de Bréau].

Discusses corrections for second edition [of Origin]. Will leave out the reference to whale and bear. Discusses pheasant crosses. Success of the book.

Asks how many kinds of supposed birds’ footprints were found in North American sandstone.

Making progress on second edition of Origin.

Encloses letter from Adam Sedgwick [2548].

Mentions conversion of A. C. Ramsay.