This book is an account of Aristotle's Metaphysics. The work is considered as a whole and each of its parts or books is taken up in the order that it has in the traditional text. The book is based on an examination of all of the manuscript readings reported in the three most recent editions of the work (those of Christ, Ross, and Jaeger), and it attempts in this way and others to come as close as possible to what would have been the original text. The Metaphysics is of course a much-studied work. What distinguishes this new effort to understand it is the working assumption that Aristotle presents in it his most comprehensive reflection on science: its character and aims, its foundations or presuppositions, and the obstacles or objections that constitute a challenge to its possibility.--