'Howell brings a sophisticated understanding of modern work in logic and the philosophy of language to bear on the most difficult and central texts of the Kantian corpus. He has a complete command of the Kantian texts - both the major texts and the ancillary ones - and he deploys it with great taste and understatement, so that one never feels as though one is being treated to a display of scholarship for its own sake. In summary, Howell's book is a splendid achievement - quite the most important piece of scholarship of modern philosophy ...' Robert P. Wolff, University of Massachusetts