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.