 James wrote the bulk of his philosophically relevant work while in Paris. Nothing remains of his early production in that city. His commentary on Peter Lombard’s Sentences has been lost, although still extant is a so-called Abbreviatio in I Sententiarum Aegidii Romani (Summary of the First Book of the Sentences of Giles of Rome), which recent scholarship suggests might be James’ preparatory notes for lectures on the Sentences rather than a summary of Giles’ commentary to the same (Tavolaro 2018), although it is unclear whether these notes were prepared during James’ student years in Paris or whether they date from his later teaching in Naples. Also lost are a treatise on the animation of the heavens (De animatione caelorum), as well as a commentary on Aristotle’s Metaphysics (Expositio primae philosophiae), two works to which James refers explicitly in his Quodlibets and which Ypma surmises must have been written during James’ four-year residency as a “formed bachelor”, i.e., between 1288 and 1292 (Ypma 1975).