 Cohen’s 1883 The Principle of the Infinitesimal Method and its History and the second, 1885 edition of Kant’s Theory of Experience reveal the considerable extent to which he modified and deepened his epistemology and philosophy of science over the course of the 1870s and early 1880s. In one move that marks his increasing clarity about his own views, he abandons the term “theory of knowledge” [Erkenntnistheorie] as irredeemably psychologistic, since it was too closely associated with psychologically-oriented projects such as Helmholtz’s. Instead, he proposes to call the project of his theoretical philosophy “critique of knowledge” [Erkenntniskritik].