 But is this “moderate realist” position Lefèvre’s own? Resolutely emphasizing the auctores themselves, he rarely deploys his own authorial voice to argue for a “Fabrist” position. In his notes on Aristotle’s Categories, however, dealing with the key category of substance, Lefèvre presents a rare quasi-treatise, a short dialogue on universals between two students of the ancient academy of Chrysippus (entitled in the margin “Disceptatio de universali”, 1503a: 23v). In the course of an amiable debate, the disputants use Aristotle’s distinction between primary and secondary substance to consider the status of universals such as species or genus. One youth presents the view that universals are what particular classes of things share; the other youth argues that universals are, in fact, what those who reason say they share—universals, in other words, are decided by convention. The position that stands, at the end of the dialogue, looks something like Boethius’s moderate realism. The youths agree that there is something conceptual that is “added” to the qualities of both the thing and the word signifying that thing.