In this book, Bryan Wesley Hall breaks new ground in Kant scholarship, exploring the gap in Kant’s Critical philosophy in relation to his post-Critical work by turning to Kant’s final, unpublished work, the so-called Opus Postumum. Although Kant considered this project to be the "keystone" of his philosophical efforts, it has been largely neglected by scholars. Hall argues that only by understanding the Opus Postumum can we fully comprehend both Kant’s mature view as well as his Critical project. In letters from 1798, Kant claims to have discovered a "gap" in the Critical philosophy...