The book features a collection of ten essays on themes from Aristotle’s Physics. Six of these have been previously published, and four are newly written for this volume. The first five essays are based on single theme, namely Aristotle’s conception of substance as it appears in his physical works. The basic texts here are Physics I-II, but the essays also range quite widely over Aristotle’s other physical works, where these are relevant to his understanding of the notions of substance, matter, and form. The general view of these five essays is that Aristotle’s idea of matter was a winner, but his idea of form certainly was not. The remaining five essays are on various topics from Physics III-VI, with each confined to the text of the Physics itself. The topics covered fall broadly under the headings: space, time, and infinity.