  Ibn Daud’s discussion of substance and accidents includes a survey of the Aristotelian categories, which is largely based on the accounts of the Muslim philosophers. After this initial exposition, the categories are not given much further attention in the rest of the book. For our purposes, however, it is important to note that this overview of the categories is the first systematic presentation of the subject or, for that matter, of any other logical work by Aristotle, in Jewish philosophy.