 It is often argued that the subtitle of the Treatise, “Attempt to Introduce the Experimental Method of Reasoning into Moral Subjects”, shows Hume’s self-conscious debt to Newton. Experiments certainly play an important role in Newton’s science. But only after 1712 does Newton refer to his own philosophy as “experimental” (in the context of his polemic with Leibniz; see Shapiro 2004). In general, Newton emphasizes the mathematical nature of his philosophy; he calls attention to this in the full title of the Principia: Mathematical Principles of Natural Philosophy.