Aristotle believed that the outermost stars are carried round us on a transparent sphere. There are directions in the universe and a preferred direction of rotation. The sun moon and planets are carried on different revolving spheres. The spheres and celestial bodies are composed of an everlasting fifth element, which has none of the ordinary contrary properties like heat and cold which could destroy it, but only the facility for uniform rotation. But this creates problems as to how the heavenly bodies create light, and, in the case of the sun, heat. The value of Simplicius' commentary on On the Heavens 2,1-9 lies both in its preservation of the lost comments of Alexander and in Simplicius' controversy with him. The two of them discuss not only the problem mentioned, but also whether soul and nature move the spheres as two distinct forces or as one. Alexander appears to have simplified Aristotle's system of 55 spheres down to seven, and some hints may be gleaned as to whether, simplifying further, he thinks there are seven ultimate movers, or only one.

Book Six of Aristotle's Physics, which concerns the continuum, shows Aristotle at his best. It contains his attack on atomism which forced subsequent Greek and Islamic atomists to reshape their views entirely. It also elaborates Zeno's paradoxes of motion and the famous paradoxes of stopping and starting. This is the first translation into any modern language of Simplicius' commentary on Book Six. Simplicius, the greatest ancient authority on Aristotle's Physics whose works have survived to the present, lived in the sixth century A.D. He produced detailed commentaries on several of Aristotle's works. Those on the Physics, which alone come to over 1300 pages in the original Greek, preserve not only a centuries-old tradition of ancient scholarship on Aristotle but also fragments of lost works by other thinkers, including both the Presocratic philosophers and such Aristotalians as Eudemus, Theophrastus and Alexander. The Physics contains some of Aristotle's best and most enduring work, and Simplicius' commentaries are essential to an understanding of it. This volume makes the commentary on Book Six accessible at last to all scholars, whether or not they know classical Greek. It will be indispensible for students of classical philosophy, and especially of Aristotle, as well as for those interested in philosophical thought of late antiquity. It will also be welcomed by students of the history of ideas and philosophers interested in problem mathematics and motion.

The aim of the present work is to show the roots of the conception of perception as an active process, tracing the history of its development from Plato to modern philosophy. The contributors inquire into what activity is taken to mean in different theories, challenging traditional historical accounts of perception that stress the passivity of percipients in coming to know the external world. Special attention is paid to the psychological and physiological mechanisms of perception, rational and non-rational perception and the role of awareness in the perceptual process. Perception has often been conceived as a process in which the passive aspects - such as the reception of sensory stimuli - were stressed and the active ones overlooked. However, during recent decades research in cognitive science and philosophy of mind has emphasized the activity of the subject in the process of sense perception, often associating this activity to the notions of attention and intentionality. Although it is recognized that there are ancient roots to the view that perception is fundamentally active, the history remains largely unexplored. The book is directed to all those interested in contemporary debates in the fields of philosophy of mind and cognitive psychology who would like to become acquainted with the historical background of active perception, but for historical reliability the aim is to make no compromises.

Book 2 of the Physics is arguably the best introduction to Aristotle's ideas, as well as being the most interesting and representative book in the whole of his corpus. It defines nature and distinguishes natural science from mathematics. It introduces the seminal idea of four causes, or four modes of explanation. It defines chance, but rejects a theory of chance and natural selection in favour of purpose in nature. Simplicius, writing in the sixth century AD, adds his own considerable contribution to this work. Seeing Aristotle's God as a Creator, he discusses how nature relates to soul, adds Stoic and Neoplatonist causes to Aristotle's list of four, and questions the likeness of cause to effect. He discusses missing a great evil or a great good by a hairsbreadth and considers whether animals act from reason or natural instinct. He also preserves a Posidonian discussion of mathematical astronomy.

An astounding project of analysis on more than one hundred translations of ancient philosophical texts, this index of words found in the Ancient Commentators on Aristotle series comprises some 114,000 entries. It forms in effect a unique dictionary of philosophical terms from the post-Hellenistic period through to late antiquity and will be an essential reference tool for any scholar working on the meaning of these ancient texts. As traditional dictionaries have usually neglected to include translation examples from philosophical texts of this period, scholars interested in how meanings of words vary across time and author have been ill served. This index fills a huge gap, therefore, in the lexical analysis of ancient Greek and has application well beyond the reading of ancient philosophical commentaries. Bringing together the full indexes from 110 of the volumes published in Bloomsbury's Ancient Commentators on Aristotle series, McKirahan has combined each word entry and analysed how many times particular translations occur. He presents his findings numerically so that each meaning in turn has a note as to the number of times it is used. For meanings that are found between one and four times the volume details are also given so that readers may quickly and easily look up the texts themselves.

Themistius ran his philosophical school in Constantinople in the middle of the fourth century A.D. His paraphrases of Aristotle's writings are unlike the elaborate commentaries produced by Alexander of Aphrodisias, or the later Neoplatonists Simplicius and Philoponus. His aim was to provide a clear and independent restatement of Aristotle's text which would be accessible as an elementary exegesis. But he also discusses important philosophical problems, reports and disagrees with other commentaries including the lost commentary of Porphyry, and offers interpretations of Plato. Themistius' paraphrase of Aristotle's On the Soul is his most important and influential work. It is also the first extant commentary on this work of Aristotle to survive from antiquity. A rival to that of Alexander of Aphrodisias, it represents one of the main interpretations of Aristotle's theory of the intellect, which was debated throughout the Middle Ages and the Renaissance. It continues to be an important text for the reconstruction of Aristotle's philosophical psychology today.

"H. J. Blumenthal is such an eminent scholar in the field of Neoplatonic Studies, and the scholarship exhibited by this book is so wide-ranging and impressive, that I would venture to say that this is the most important book on Neoplatonism to be published since Dominic O'Meara's Pythagoras Revived." —Steven Strange, Emory UniversityScholars have traditionally used the Aristotelian commentators as sources for lost philosophical works and occasionally also as aids to understanding Aristotle. In H. J. Blumenthal's view, however, the commentators often assumed that there was a Platonist philosophy to which not only they but Aristotle himself subscribed. Their expository writing usually expressed their versions of Neoplatonist philosophy. Blumenthal here places the commentators in their intellectual and historical contexts, identifies their philosophical views, and demonstrates their tendency to read Aristotle as if he were a member of their philosophical circle.This book focuses on the commentators' exposition of Aristotle's treatise De anima (On the Soul), because it is relatively well documented and because the concept of soul was so important in all Neoplatonic systems. Blumenthal explains how the Neoplatonizing of Aristotle's thought, as well as the widespread use of the commentators' works, influenced the understanding of Aristotle in both the Islamic and Judaeo-Christian traditions.H. J. Blumenthal is the author or coeditor of six previous books and is currently preparing a two-volume translation, with introduction and commentary, of Simplicius' Commentary on "De anima" for publication in Cornell's series Ancient Commentators on Aristotle.