This edition of Giraldus Odonis' "Logica" for the first time gives access to an important and original treatise, which has unduly been neglected since the author's death. It is also important in that it gives evidence of interesting achievements in the field of logic outside the anti-metaphysical circle surrounding Ockham.

L.M. de Rijk, Ph.D. (1952) in Philosophy, University of Utrecht, was born in 1924. He is Emeritus Professor of Ancient and Medieval Philosophy at the University of Leiden, and Honorary Professor at the University of Maastricht. He is the author of a large number of publications on ancient and medieval philosophy, including Abailard's Dialectica (1956), a work on terminist logic, Logica Modernorum (1962-1967), Peter of Spain's Summule logicales (1972), La philosophie au moyen âge (Brill, 1985), and The Letters of Nicholas of Autrecourt (Brill, 1994).