Physics Book 4 is one of Aristotle's most interesting works, discussing place, time and vacuum. Themistius was a fourth-century AD orator and essayist, not only a philosopher, and he thought that only paraphrases of Aristotle were needed, because there were already such comprehensive commentaries. Nonetheless, his paraphrastic commentaries are full of innovative comment. According to Aristotle, there is no such thing as 3-dimensional space. A thing's exactly-fitting place is a surface, the inner surface of its immediate surroundings. One problem that this created was that the outermost stars, in Aristotle's view, have no surroundings, and so no place. Themistius suggests that we might think instead of the neighbouring bodies which they surround as providing their place. Aristotle saw time as something countable, and concluded that it depends for its existence on that of conscious beings to do the counting. Themistius is in the minority among commentators in disagreeing. Themistius concurs with Aristotle in denying the existence of vacuum. We cannot think that a space formerly empty of body penetrates right through a body inserted into it. If one extension could penetrate another, says Themistius, a body could penetrate a body, because bodies occupy places solely in virtue of being extended.

The paraphrases, or commentary, of scholars such as Themistius (c. 317 c. 388 AD) were designed to clarify the texts of some of Aristotle's central works, and thereby make them accessible to relatively advanced students. This English translation of the paraphrases finds Themistius commenting on Aristotle's Physics 4, in which the philosopher assert

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Aristotle's account of place, in which he defined a thing's place as the inner surface of its nearest immobile container, was supported by the Latin Middle Ages, even 1600 years after his death, though it had not convinced many ancient Greek philosophers. The sixth century commentator Philoponus took a more common-sense view. For him, place was an immobile three-dimensional extension, whose essence did not preclude its being empty, even if for other reasons it had always to be filled with body. However, Philoponus reserved his own definition for an excursus, already translated in this series, The Corollary on Place. In the text translated here he wanted instead to explain Aristotle's view to elementary students. The recent conjecture that he wished to attract young fellow Christians away from the official pagan professor of philosophy in Alexandria has the merit of explaining why he expounds Aristotle here, rather than attacking him. But he still puts the students through their paces, for example when discussing Aristotle's claim that place cannot be a body, or two bodies would coincide. This volume contains an English translation of Philoponus' commentary, as well as a detailed introduction, extensive explanatory notes and a bibliography.

Philoponus has been identified as the founder in dynamics of the theory of impetus, an inner force impressed from without, which, in its later recurrence, has been hailed as a scientific revolution. His commentary is translated here without the previously translated excursus, the Corollary on Void, also available in this series. Philoponus rejects Aristotle's attack on the very idea of void and of the possibility of motion in it, even though he thinks that void never occurs in fact. Philoponus' argument was later to be praised by Galileo. This volume contains the first English translation of Philoponus' commentary, as well as a detailed introduction, extensive explanatory notes and a bibliography.

Philoponus' commentary on the last part of Aristotle's Physics Book 4 does not offer major alternatives to Aristotle's science, as did his commentary on the earlier parts, concerning place, vacuum and motion in a vacuum. Aristotle's subject here is time, and his treatment of it had led to controversy in earlier writers. Philoponus does offer novelties when he treats motion round a bend as in one sense faster than motion on the straight over the same distance in the same time, because of the need to consider the greater effort involved. And he points out that in an earlier commentary on Book 8 he had argued against Aristotle for the possibility of a last instant of time. This volume contains an English translation of Philoponus' commentary, as well as a detailed introduction, extensive explanatory notes and a bibliography.

Themistius' treatment of Books 1-3 of Aristotle's Physics presents central features of Aristotle's thought about principles, causation, change and infinity. The tradition of synthesising and epitomising exegesis is here raised to a new level by the innovative method of paraphrase pioneered by Themistius. Taking a selective, but telling, account of the earlier Peripatetic and Presocratic tradition, Themistius creates a framework that can still be profitably used in the study of Aristotle. This volume contains the first English translation of Themistius' commentary, accompanied by a detailed introduction, extensive explanatory notes and a bibliography.

Discusses the core ideas in Aristotle's account of change, his theory of the continuum, and his doctrine of the unmoved mover. This book covers the central features of Aristotle's physical theory, synthesized and epitomized in a manner that has always marked Aristotelian exegesis.

This companion to J. O. Urmson's translation in the same series of Simplicius' Corollaries on Place and Time contains Simplicius' commentary on the chapters on place and time in Aristotle's Physics book 4. It is a rich source for the preceding 800 years' discussion of Aristotle's views. Simplicius records attacks on Aristotle's claim that time requires change, or consciousness. He reports a rebuttal of the Pythagorean theory that history will repeat itself exactly. He evaluates Aristotle's treatment of Zeno's paradox concerning place. Throughout he elucidates the structure and meaning of Aristotle's argument, and all the more clearly for having separated off his own views into the Corollaries.

Physics in Neoplatonist thought, the subject which occupies the second volume of this sourcebook, was innovative: the world of space and time was causally ordered by a nonspatial, nontemporal world, and this view required original thinking