J.O. Urmson was Tutor in Philosophy at Corpus Christi College, University of Oxford, UK, and Henry Waldgrave Stuart Professor of Philosophy, Emeritus, at Stanford University, USA.

Paul Lettinck has restored a lost text of Philoponus by translating it for the first time from Arabic (only limited fragments have survived in the original Greek). The text, recovered from annotations in an Arabic translation of Aristotle, is an abridging paraphrase of Philoponus' commentary on Physics Books 5-7, with two final comments on Book 8.
The Simplicius text, which consists of his comments on Aristotle's treatment of the void in chapters 6-9 of Book 4 of the Physics, comes from Simplicius' huge commentary on Book 4. Simplicius' comments on Aristotle's treatment of place and time have been translated by J. O. Urmson in two earlier volumes of this series.

Preface
Introduction
Textual Emendations
TRANSLATION
Notes
Bibliography English-Greek
Glossary Greek-English Index
Index of Passages Cited
Subject
Index