Jack Zupko

MEDIEVAL PHILOSOPHERS HAD NO SINGLE RESPONSE to the difficult question of how souls are related to the bodies they animate. In this respect, the theory of psychological inherence advanced by the noted Parisian philosopher John Buridan is a case in point. Buridan offers different accounts of the soul-body relation, depending upon which of two main varieties of natural, animate substance he is explaining. In the case of human beings, he defends a version of immanent dualism: the thesis that the soul is an immaterial, everlasting, and created entity, actually inhering in each and every body it animates, and thus numerically many. But when his explanandum is the relation between nonhuman animal or plant souls and their bodies, Buridan is a materialist; that is, he regards the sensitive and vegetative souls of such creatures as no more than collections of material, extended powers exhaustively defined by their biological functions, and hence as corruptible as the particular arrangements of matter they happen to animate.

John Buridan was the most famous philosophy teacher of his time, and probably the most influential. In this important new book, Jack Zupko offers the first systematic exposition of Buridan's thought to appear in any language. Zupko uses Buridan's own conception of the order and practice of philosophy to depict the most salient features of his thought, beginning with his views on the nature of language and logic and then illustrating their application to a series of topics in metaphysics, natural philosophy, and ethics. Part 1 of John Buridan considers the picture of language and logic developed in Buridan's Summulae de dialectica. Buridan systematically overhauled the logic he first learned and later taught at the University of Paris, redeeming the older tradition of Aristotelian logic in terms, propositions, and arguments. This made possible newer and more powerful forms of philosophical discourse. The second part of this volume provides a reading of Buridan's philosophy, showing how this discourse shaped his treatment of speculative questions such as the relation between soul and body, the nature of knowledge, the proper subject of psychology, the function of the.