Helen Lang is Professor of Philosophy at Trinity College.

"This book performs a masterly job, both of exegesis of texts of Aristotle and his later readers, and also of comparing the two sets of texts in order to bring out the significance of the assumptions governing each interpretation and the implications for the history of philosophy in a whole range of important ways." — Catherine Osborne, University College of Swansea

• Acknowledgments Introduction Part I. Aristotle's Physics 1. Aristotle's Definition of Nature 2. Parts, Wholes, and Motion: Physics 7.1 3. Why Fire Goes Up: An Elementary Problem in Aristotle's Physics 4. Being On the Edge in Physics 8.10 Part II. Its Medieval Varieties 5. Aristotle and Philoponus on Things That Are by Nature 6. Albertus Magnus: Aristotle and Neoplatonic Physics 7. The Structure of Physics for Aristotle, Thomas, and Buridan 8. Duns Scotus: Putting Angels in Their Place Notes Bibliography Index of Names Index of Subjects

Helen Lang is Professor of Philosophy at Trinity College.

"This book performs a masterly job, both of exegesis of texts of Aristotle and his later readers, and also of comparing the two sets of texts in order to bring out the significance of the assumptions governing each interpretation and the implications for the history of philosophy in a whole range of important ways." — Catherine Osborne, University College of Swansea

• Acknowledgments Introduction Part I. Aristotle's Physics 1. Aristotle's Definition of Nature 2. Parts, Wholes, and Motion: Physics 7.1 3. Why Fire Goes Up: An Elementary Problem in Aristotle's Physics 4. Being On the Edge in Physics 8.10 Part II. Its Medieval Varieties 5. Aristotle and Philoponus on Things That Are by Nature 6. Albertus Magnus: Aristotle and Neoplatonic Physics 7. The Structure of Physics for Aristotle, Thomas, and Buridan 8. Duns Scotus: Putting Angels in Their Place Notes Bibliography Index of Names Index of Subjects