Abstract

The article deals with four questions that are, in general, present at the beginning of commentaries to the Book of six principles : 1. To what discipline does the treatise belong ? 2. What is the subject of the treatise and under what mode is it considered ? 3. Why is this treatise set apart from Aristotle’s Categories ? 4. Why speak of “principles” there ? Commentaries of the second half of the thirteenth century and of the beginning of the fourteenth century are taken under consideration (unedited for the most part).