 The track record of a priori methods like appeal to intuitions and conceptual analysis is not a promising one (e.g., Harman 1994; Hintikka 1999). Kant, for example, took it to be a priori that space necessarily had the structure described by Euclidean geometry; subsequent physics showed his intuitions to be mistaken. The lesson naturalists draw from this track record of a priori philosophy is well-expressed by Cummins (1999, pp. 117–18):