 One possible reason for the changes to the material on Kant between Lange’s first and second editions is the influence of Hermann Cohen, Lange’s protege and the founder of the Marburg School of Neo-Kantianism. As Sieg (1994) details, Cohen published his major work Kant’s Theory of Experience in 1871, in which he criticized “Lange’s understanding of the Kantian a priori as a naturalist misinterpretation” (p. 104). By November 1871, Lange and Cohen were in correspondence, and Lange indicated that he was impressed by Cohen’s criticisms. According to Sieg (1994), Lange’s second edition shows that he is interpreting the Kantian thing in itself as a “limiting concept [Grenzbegriff]” in Cohen’s sense (p. 104). For an account of the development of Lange’s thought on this score, and of the mutual influence of Lange and Cohen, see Adelmann (2012), pp. 83–93.