In the same manuscript the version of Averroës’s Commentary on the various books which compose the _Parva Naturalia_ of Aristotle is ascribed to Gerard of Cremona. Renan observes that this ascription does not occur in any other copy, and supposes it to have been a mistake. He seems influenced in this conclusion by the fact that Gerard of Cremona died in 1187. It is curious to find such an eminent scholar forgetful of the existence of a younger Cremonese; and he is not alone in this error, for it has been repeated even of late years. Yet in 1851 Prince Baldassare Boncompagni had distinguished well between the elder and younger Gerard of Cremona in an excellent monograph on the subject.[174] Even had this work not been published, the learned world had already reason enough to suspect the truth. In a well-known passage of his _Compendium Studii_,[175] Roger Bacon speaks of Gerard of Cremona as a contemporary of Michael Scot, Alured of England, William the Fleming, and Herman the German, adding that those who were still young had nevertheless known Gerard, who was the eldest of this company of scholars. Now the _Compendium Studii_ is commonly assigned to the year 1292, but even if we carry this passage back to 1267, when the most of Bacon’s works were written, it still appears evidently impossible that any one still young in that year could have seen a man who died in 1187. Boncompagni, as we have said, explains the difficulty by acquainting us with the younger Gerard, called _de Sabloneta_ Cremonensis. He was undoubtedly a contemporary of Michael Scot, and the De Rossi manuscript, already referred to,[176] shows that he was in Spain about this time. There is therefore no reason to distrust the testimony of the Victorine codex when it gives Gerard the honour of having translated Averroës on the _Parva Naturalia_. In accomplishing this work he vindicated his right to the place we have already ventured to assign him as a member of the Toledan College. The manuscript collections where the _De Coelo et Mundo_, the _De Anima_, and the _Parva Naturalia_ of Averroës are found in a Latin dress, contain also versions of several other commentaries by the same author: those concerning the _De Generatione et Corruptione_, the four books of the _Meteora_, the _De Substantia Orbis_, and the _Physica_ and _Metaphysica_ of Aristotle.[177] We may safely ascribe them to the Toledo College. They were translated either by Michael Scot, Gerard of Cremona, or some other scholar who worked under these masters.