The 13th-century manuscript is composed of three parts. The first part contains Aristotelian and pseudo-Aristotelian works in Latin translation. The second part contains 'De mineralibus' and 'De natura loci' by Albertus Magnus. The third part consists of a commentary by Michael Scotus on Johannes de Sacrobosco's work about the heavenly spheres, an anonymous commentary on the Arithmetic of Boethius, and the commentary by Averroës on Aristotle's 'De longitudine et brevitate vitae'. This manuscript is among the finest examples of Italian secular book production from the last third of the 13th century, and it is one of the earlier illuminated Aristotelian manuscripts. (pil)