Sends some articles on mammals [possibly "On the relations of the orders of mammals", Proc. Am. Assoc. Adv. Sci. 19 (1870): 267–70, and "On the characteristics of the primary groups of the class of mammals", ibid. 20 (1871): 284–306].
He is a disciple, convinced of CD’s theory of evolution and of natural selection.
In the U. S. almost all refuse to recognize natural selection.