Responds to comments on geology of Florida.

Discusses coral reefs and paper by John Murray ["On the structure and origin of coral reefs and islands", Proc. R. Soc. Edinburgh 10 (1880): 505–18].

Comments on AA’s paper ["Paleontological and embryological development", Proc. Am. Assoc. Adv. Sci. 29 (1880): 389–414].

Making arrangements to see Meldola.

Passage in first edition of Origin, [p. 184] on bears rendered larger and more aquatic by selection was omitted from subsequent editions on advice of Richard Owen. Has always regretted following that advice.