Concentrates on a single problem in medieval theology: the relationship between Christ's bodily presence in the Eucharist & the conversion of the Eucharistic elements, bread & wine, into Christ's body & blood. Traces discussion of this problem in the Franciscan order during the late 13th cent. from St. Bonaventure to John Duns Scotus. Contents: The Thomist-Bonaventuran Thesis, Eucharistic Thought in the 1240s: Albert the Great, Wm. of Militona, & Richard Fishacre, Reception of the Thomist-Bonav. Thesis outside the Franciscan Order, The Franciscan Critique: Wm. de la Mare, Matthew of Aquasparta, John Pecham, Peter Olivi, Roger Marston, & Wm. of Falgar, Richard of Middleton, Vitalis de Furno, & Wm. of Ware, John Duns Scotus, Conclusion. This is a print on demand edition of an important, hard-to-find publication.