In a new book, Wolfram Schmidgen, professor of English, explains how the excitement and anxiety about a disordered world affected literary invention in 18th-century England. “Infinite Variety: Literary Invention, Theology, and the Disorder of Kinds, 1688-1730” combines intellectual history with close analysis of the literary inventions of Richard Blackmore, John Locke, Jonathan Swift, and Daniel Defoe.