R. W. Sharples provides a new edition, with introduction and commentary in English, of the Greek text. The Mantissa is a collection of short discussions, transmitted as a supplement to the treatise On the Soul by the Aristotelian commentator Alexander of Aphrodisias (c.200 AD). The collection includes discussion of a range of topics, among them the nature of soul and intellect, theories of how seeing takes place, issues in ethics, and the nature of fate. The text is based upon a new collation of the principal manuscript, the ninth century Venetus Marcianus graecus 258, and the apparatus corrects Bruns' misreportings of the principal manuscript and of the others that he used. Account has also been taken of the medieval Arabic and Latin versions of some of the sections which circulated independently, notably On Intellect which had a substantial influence on medieval philosophy. The introduction is chiefly concerned with the manuscripts and the relation between them. The commentary is based on the notes to the editor's English translation of the work (London: Duckworth and Ithaca: Cornell University Press, 2004); however, the commentary also takes into account more recent work on the collection by various scholars.

No Aristotelian doctrine had a greater influence on medieval philosophy and theology than that of the agent, or active, intellect. This influence, however, was mediated by a long tradition of exegesis in which the Greek commentaries of later antiquity played a dominant role. The two commentaries presented here were known to have been influential in the Middle Ages and the Renaissance. The first is a short treatise called the "De intellectu", attributed to Alexander of Aphrodisias; the second a paraphrase of Aristotle's "De anima" (3.4-8) by Themistius, which also includes a major interpretation of "De anima" (3.5), the chapte on the active intellect.

This book describes the doctrine and impact of Alexander of Aphrodisias, the second-century commentator on Aristotle, through the centuries and up to his sixteenth-century role as the clandestine prompter of a new philosophy of nature. In the millennium after his death, Alexander first served the Neo-Platonic schools as their authority on Aristotle, and in the Arabic centuries subsequently served as Averroes’ exemplary exponent of the doctrine of the mortality of the soul. For this reason, the Latin Scholastics deemed his work unworthy of being translated. This changed only in the late Middle Ages, when Alexander emerged as the only Aristotelian alternative to Averroes. When in 1495 his account of Aristotle’s psychology was translated and published, his principles of a natural philosophy, which were exempt from metaphysics and based on sense perception, eventually became accessible. The prompt reception and widespread endorsement of Alexander’s teaching testify to his impact throughout the sixteenth century. Originally published as Volume XVI, No. 1 (2011) of Brill's journal Early Science and Medicine.

Around 200 AD, the greatest defender and interpreter of Aristotle within his school, Alexander of Aphrodisias, composed his own book On the Soul, partly following the pattern of Aristotle's. In the first half, translated in this volume, he discusses the soul as the form of the body, and the idea of parts or powers that constitute the soul of living things, including the two lowest powers: nutrition and perception. In the second half, translated in Part II, he discusses perception, representation, desire, understanding and - a notion emphasised by the Stoics - the governing part of the soul. He takes the soul to consist of these powers, which supervene on the mixture of the body's elemental ingredients, just as inanimate powers like buoyancy or lightness can supervene on other qualities. They are new, emergent causal powers of the living thing, which do not belong to the constituent ingredients of the body in themselves. Through his notion of emergence, he seeks to steer between the Platonic dualism of soul and body and the extreme materialism of his Stoic rivals. This volume contains the first English translation of the work, as well as a detailed introduction, extensive explanatory notes and a bibliography.