 Kant’s discussion of the principle of nature’s purposiveness for our cognitive faculties, and his related earlier discussion (in the Appendix to the Transcendental Dialectic of the Critique of Pure Reason) of the regulative principle of nature’s systematicity, have, together, been seen as very important for the understanding of Kant’s views on empirical science. Moreover, to the extent that the principle is seen as required not only for the construction of systematic scientific theories, but also for the recognition of nature’s empirical lawlikeness or (even more fundamentally) for the possibility of any empirical concept-formation at all, it takes on great importance for an understanding of Kant’s views on empirical cognition generally. However, Kant’s discussion of the principle has been thought to pose a number of serious interpretative and philosophical difficulties, including the following: