(Strasbourg: Georg Husner), 1491. Folio (282 x 209 mm). 124 leaves. Collation: a8, b6, c8, d6, e8, f-o6, p8, q6, r8, A-B6. Part one lacking first 6 leaves (title-page, table); part two lacking C-F6 (as compared with Biblioteca Universitaria de Deusto copy). 51 lines, double column. Gothic type (type 1:160G, 3:91G, 5:80G). First 47 leaves rubricated in red. Nineteenth century limp blue paper wrappers, front wrapper detached, but present; first three leaves with assorted tears and losses, first leaf missing large section of bottom corner; tide mark at fore-edge and bottom edge of most leaves; scattered worming throughout entire text; old collator's notes at top edge of first leaf; foliated in pencil by a later hand. With the book-plate of the Theological Seminary Library, Gettysburg, Pa. on verso of front wrapper. ISTC io00018000; Goff O18; BMC I 141; GW 11912. William of Ockham (1287-1347) was an English Franciscan friar, scholastic philosopher, and theologian. Along with Thomas Aquinas and John Duns Scotus, he is one of the most prominent philosophers during the High Middle Ages.