Since its original publication in 1929, Martin Heidegger s provocative book on Kant s Critique of Pure Reason has attracted much attention both as an important contribution to twentieth-century Kant scholarship and as a pivotal work in Heidegger s own development after Being and Time. This fifth, enlarged edition includes marginal notations made by Heidegger in his personal copy of the book and four new appendices―Heidegger s postpublication notes on the book, his review of Ernst Cassirer s Philosophy of Symbolic Forms, Heidegger s response to reviews by rudolf Odebrecht and Cassirer, and an essay On the History of the Philosophical Chair since 1866. The work is significant not only for its illuminating assessment of Kant s thought but also for its elaboration of themes first broached in Being and Time, especially the problem of how Heidegger proposed to enact his destruction of the metaphysical tradition and the role that his reading of Kant would play therein.