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.