 In 1503, Lefèvre published an edition, with introductions, paraphrases, and commentary, of Aristotle’s logical works. Rather than, as Valla had done, reconstructing the “old logic” of Aristotle, Porphyry, and Boethius and ignoring the “logic of the moderns” (logica modernorum) with its categoremata, sophismata, and insolubilia, Lefèvre tried to clarify the sources of the “old logic” (Vasoli 1968). He called logic a disciplina disserendi (1503a: 2r, 228v), similar to Agricola’s earlier redefinition of dialectic as the ars disserendi, later taken up by Ramus (though Lefèvre probably did not read Agricola’s book, first published in 1515; see Agricola 1515, as cited by Mack 1993: 346). Like Agricola before him and Ramus later on, Lefèvre divided logic into three parts: proloquia, judgement, and invention. The first part, using the works of the logica vetus, classifies things in the world according to substances and their various qualities by considering how propositions (proloquia) are formed. The second and third parts belong to the logica nova: in the area of judgement, the Prior Analytics teach how to organize statements into a valid argument; in the area of invention, the Topics and the Sophistic Refutations teach how to find the subject matter to form an argument. Lefèvre’s terminology of proloquia, judgement, and invention (Lefèvre 1503a: 228v), though traditional, says much: Agricola had used it, and Ramus would also take it up. Where Agricola had focused on invention, Ramus would emphasize judgement. In contrast, Lefèvre thought the first part of logic—categorizing the world according to the language of substance, quality, and the other proloquia of Porphyry’s Isagoge and Aristotle’s Categories—needed the most attention, if we judge by where he most carefully and thoroughly introduced his sources. For example, instead of offering a complete paraphrase of the Topics, as he did for the Categories and the Prior and Posterior Analytics, Lefèvre supplied only scholia “ad litteram” in a format which was unusually brief, even for him.