Arthur Madigan presents a clear, accurate new translation of the third book (Beta) of Aristotle's Metaphysics, together with two related chapters from the eleventh book (Kappa). Madigan's accompanying introduction and commentary give detailed guidance to these texts, in which Aristotle sets out what he takes to be the main problems of metaphysics or 'first philosophy' and assesses possible solutions to them; he takes his starting-point from the work of earlier philosophers, especially Plato and some of the Presocratics. These texts serve as a useful introduction both to Aristotle's own work on metaphysics and to classical metaphysics in general; they are also a good example of Aristotle's dialectical method, which reasons not from known truths but from reputable opinions.