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].