  Buridan commented on virtually all of the major works of Aristotle. In addition to the entire Organon, there are commentaries on Aristotle's Physics, On the Heavens, On Generation and Corruption, De Anima, Parva Naturalia, Metaphysics, Nicomachean Ethics, and  Rhetoric.[6]  He also wrote a number of shorter, independent treatises on philosophical topics that were controversial in his day, such as the Tractatus de relationibus [Treatise on Relations], Tractatus de universalibus [Treatise on Universals], Tractatus de consequentiis [Treatise on Consequences], and Quaestio de puncto [Question on &lt;the Nature of&gt; Points].  He was a very prolific author.