Ronald L. Numbers, Darwinism Comes to America (Cambridge, MA: Harvard University Press, 1998), Chapter 1, "Darwinism and the Dogma of Separate Creations: The Responses of American Naturalists to Evolution." The best study of Protestant responses to evolution in America is Jon H. Roberts, Darwinism and the Divine in America: Protestant Intellectuals and Organic Evolution, 1859-1900 (Madison: University of Wisconsin Press, 1998). But see also James R. Moore, The Post-Darwinian Controversies: A Study of the Protestant Struggle to Come to Terms with Darwin in Great Britain and America, 1870-1900 (Cambridge: Cambridge University Press, 1979); and David N. Livingstone, Darwin’s Forgotten Defenders: The Encounter between Evangelical Theology and Evolutionary Thought (Grand Rapids, MI: William B. Eerdmans, 1987).