Historians of science have described various cases of disciplines influencing one another. Such exchanges across disciplinary boundaries often signal innovation, intellectual change, and breakthroughs. A satisfactory framework from which the historical phenomenon of epistemic transfer between disciplines can be studied systematically, however, has not yet been proposed. This essay introduces the notion of “cognitive goods,” a tool of knowledge making that can be transferred across disciplinary boundaries. Cognitive goods include, for example, methods, concepts, and instruments. The essay proposes to study historical interactions between disciplines as instances of the “flow” of cognitive goods. The notion of cognitive goodsmay serve as a springboard for a systematic analysis of flows occurring throughout the history of the disciplines. Such an analysis could be instrumental for an integrated historiography of knowledge, including the humanities and the natural and social sciences.