. . . enriching study of previously neglected sources of epistemological transformation during the Enlightenment ear. Matytsin's work uncovers a dialectical pathway in which interchanges between skeptics and their opponents formed a new conception of reason, sufficiently modest to have relinquished metaphysics, but sufficiently bold to motivate the encyclopedists' expansive ambitions, and to play a formative role in establishing the modern disciplinary structure of knowledge.—The Eighteenth-Century Intelligencer