Octavo (155 x 105 mm); 223 leaves, (2 blank). Full limp vellum with overlapping edges (yapp edges) and traces of original ties. A charming edition of this Aristotelian work on hearing, prepared using the best manuscripts and featuring commentaries by the greatest authors of the past—most notably Averroes. It also includes Marcantonio Zimarra’s resolutions to the text's contradictions. Good internal condition. Some early manuscript marginalia. Binding shows signs of age, with remnants of ties and replaced endpapers.