 In the 1490s, Lefèvre also published works for the university class room which went beyond Aristotle, notably in mathematics (Oosterhoff 2018). For astronomy, he wrote an important commentary on the standard introduction, John of Sacrobosco’s Sphere (1495). In print, arguably Lefèvre’s most original contribution to any field was a systematic treatise on music theory (Elementa musicalia) which he published with three other works: an edition of the Elementa arithmetica of Jordanus Nemorarius (13th century), his own popular introduction to the Arithmetica of Boethius, and an arithmetical game, Rithmomachia (1496a; see also Oosterhoff 2013, Moyer 2012). These mathematical works served pedagogical uses, first of all, helping students through an often-neglected part of the Paris cursus. But they also served philosophical aims of Lefèvre which became more evident in works unrelated to the university curriculum. Consider three examples: in 1494 he published Ficino’s Latin translation of most of the Hermetic Corpus, along with his own brief annotations; in 1498, he printed the first edition of the Works attributed to Dionysius the Areopagite, in Latin translation, along with an extensive commentary; and in the mid-1490s he composed On Natural Magic (De magia naturali ), which circulated in manuscript (Lefèvre [MN]). Inspired partly by Ficino’s Three Books on Life (De triplici vita), this treatise incorporated Pythagorean, cabbalistic, and Presocratic themes, for example in a section on “Pythagorean Magic” (Copenhaver 1977; Mandosio 2013). His reflections on magic especially included numerological excurses.