The 15,000 pages of the ancient Greek commentators on Aristotle, written mainly between 200 and 600 AD, constitute the largest corpus of extant Greek philosophical writings not translated into English or other European languages. This series of translations with introductions, copious notes and indexes fills an important gap in the history of European thought.

Aristotle's "Meterology Book 4" provides an account of the formation of minerals, metals and other homogeneous stuffs. In doing so, this text argues, it offers us fresh and important insights into Aristotle's conception of matter. The 15,000 pages of the ancient Greek commentators on Aristotle, written mainly between 200 and 600 AD, constitute the largest corpus of extant Greek philosophical writing not translated into English or other European languages. This is a new series of translations, planned in 60 volumes which fills an important gap in the history of European thought.

The commentary of Alexander of Aphrodisias on Aristotle's Prior Analytics 1.8-22 is a very important text, being the main ancient commentary with chapters in which Aristotle invented modal logic - the logic of propositions about what is necessary or contingent (possible). The first volume of Ian Mueller's translation covered chapters 1.8-13, and reached as far as the chapter in which Aristotle discussed the notion of contingency. In this, the second volume, the 'greatest' commentator, Alexander, concludes his discussion of Aristotle's modal logic. Aristotle also invented the syllogism, a style of argument involving two premises and a conclusion. Modal propositions can be deployed in syllogisms, and in the chapters included in this volume Aristotle discusses all the syllogisms containing at least one contingent premiss. In each volume, Ian Mueller provides a comprehensive explanation of Alexander's commentary on modal logic as a whole.

In Metaphysics 4 Aristotle discusses the nature of metaphysics, the basic laws of logic, the falsity of subjectivism and the different types of ambiguity. The full, clear commentary of Alexander of Aphrodisias on this important book is here translated into English by Arthur Madigan. Alexander goes through Aristotle's text practically line by line, attending to the logical sequence of the arguments, noting places where Aristotle's words will bear more than one interpretation and marking variant readings. He repeatedly cross-refers to the De Interpretatione, Analytics, Physics and other works of Aristotle, thus placing Metaphysics 4 in the content of Aristotle's philosophy as a whole

Aristotle's Topics is about dialectic, which can be understood as a debate between two people or the inner debate of one thinker with himself. Its purposes range from philosophical training to discovering the first principles of thought. Its arguments concern the four predicables (definition, property, genus and accident). Aristotle explains how these four fit into his ten categories, and in Book 1 begins to outline strategies for debate, such as the definition of ambiguity. Alexander's commentary on Book 1 discusses how to define Aristotelian syllogistic argument, why it stands up against the rival Stoic theory of interference, and what is the character of inductive interference and of rhetorical argument. He distinguishes inseparable accidents such as the whiteness of snow from defining differentiae such as its being frozen, and considers how these fit into the scheme of categories. He speaks of dialectic as a stochastic discipline in which success is to be judged not by victory but by skill in argument, a view parallel to that sometimes taken in antiquity of medical practice. And he investigates the subject of ambiguity which had also been richly developed since Aristotle by the rival Stoic school.

The commentary of Alexander of Aphrodisias on Aristotle's Prior Analytics 1.8-22 is the main ancient commentary, by the 'greatest' commentator, on the chapters of the Prior Analytics in which Aristotle invented modal logic - the logic of propositions about what is necessary or contingent (possible). In this volume, which covers chapters 1.8-13, Alexander of Aphrodisias reaches the chapter in which Aristotle discusses the notion of contingency. Also included in this volume is Alexander's commentary on that part of Prior Analytics 1.17 which explains the conversion of contingent propositions (the rest of 1.17 is included in the second volume of Mueller's translation). Aristotle also invented the syllogism, a style of argument involving two premises and a conclusion. Modal propositions can be deployed in syllogism, and in the chapters included in this volume Aristotle discusses syllogisms consisting of two necessary propositions as well as the more controversial ones containing one necessary and one non-modal premiss. The discussion of syllogisms containing contingent propositions is reserved for Volume 2. In each volume, Ian Mueller provides a comprehensive explanation of Alexander's commentary on modal logic as a whole.

The "Supplement" transmitted as the second book of "On the Soul" by Alexander of Aphrodisias (fl. c. 200 AD) is a collection of short texts on a wide range of topics from psychology, including the general hylomorphic account of soul and its faculties, and the theory of vision; questions in ethics (natural instincts, the unity of the virtues, the naturalness of justice and the insufficiency of virtue for happiness); and issues relating to responsibility, chance and fate. One of the texts in the collection, "On Intellect", had a major influence on medieval Arabic and Western thought, greater than that of Alexander's "On the Soul" itself. The treatises may all be by Alexander himself; certainly the majority of them are closely connected with his other works. Many of them, however, consist of collections of arguments on particular issues, collections which probably incorporate material from earlier in the history of the Peripatetic school. This translation is from a new edition of the Greek text based on a collation of all known manuscripts and comparison with medieval Arabic and Latin translations.

This volume completes the translation in this series of Quaestiones attributed to Alexander of Aphrodisias, the leading ancient commentator on Aristotle. The Quaestiones are concerned with physics and metaphysics, psychology and divine providence. They exemplify the process whereby Aristotle's thought came to be organised into 'Aristotelianism' and show how interpretations were influenced by doctrines of Hellenistic philosophy. Some, translated into Arabic and thence into Latin, played a part in the transmission of ancient Greek philosophy to the medieval world. Those interested in Aristotle's psychological views will find this half of Quaestiones particularly valuable. Ten of the problems discussed explicitly involve issues raised in On the Soul, including the unity of apperception and the transition from first to second actuality in the act of contemplation. A further dozen concern problems in physical theory, including infinity, necessity and potentiality. Quaestio 2.21 concerns divine providence and helps supplement our knowledge of Alexander's position based on surviving Arabic fragments of his On Providence.

This book includes the complete text of Alexander of Aphrodisias on Fate, a translation and detailed commentary.