 Thus, while the Summa of Logic is not in any sense a “commentary” on Aristotle’s logical writings, it nevertheless covers all the traditional ground in the traditional order: Porphyry’s Isagoge and Aristotle’s Categories in Part I, On Interpretation in Part II, Prior Analytics in Part III.1, Posterior Analytics in Part III.2, Topics (and much else) in Part III.3, and finally Sophistic Refutations in Part III.4.