When still in print, Henri Grenier\'s manual of Thomism was widely used in seminaries and universities. Those discovering this work for the first time have described it as \"the answer key\" to St. Thomas Aquinas. Because of the importance of Thomistic philosophy, Grenier\'s multi-volume manual is being brought back into print. This is a re-print edition of the first edition set, so there are three volumes total: Volume I: Logic and Philosophy of Nature Volume II: Metaphysics Volume III: Moral Philosophy