John McGuire

One of the earliest and most influential treatises on the subject of this volume is Aristotle's Categories. Aristotle's title is a form of the Greek verb for speaking against or submitting an accusation in a legal proceeding. By the time of Aristotle, it also meant: to signify or to predicate. Surprisingly, the "predicates" Aristotle talks about include not only bits of language, but also such nonlinguistic items as the color white in a body and the knowledge of grammar in a man's soul. (Categories I/ii) Equally surprising are such details as Aristotle's use of the terms 'homonymy' and 'synonymy' in connection with things talked about rather than words used to talk about them. Judging from the evidence in the Organon, the Metaphysics, and elsewhere, Aristotle was both aware of and able to mark the distinction between using and men tioning words; and so we must conclude that in the Categories, he was not greatly concerned with it. For our purposes, however, it is best to treat the term 'predication' as if it were ambiguous and introduce some jargon to disambiguate it. Code, Modrak, and other authors of the essays which follow use the terms 'linguistic predication' and 'metaphysical predication' for this.

Descartes's works are often treated as a unified, unchanging whole. But in Descartes's Changing Mind, Peter Machamer and J. E. McGuire argue that the philosopher's views, particularly in natural philosophy, actually change radically between his early and later works--and that any interpretation of Descartes must take account of these changes. The first comprehensive study of the most significant of these shifts, this book also provides a new picture of the development of Cartesian science, epistemology, and metaphysics. No changes in Descartes's thought are more significant than those that occur between the major works The World and Principles of Philosophy. Often seen as two versions of the same natural philosophy, these works are in fact profoundly different, containing distinct conceptions of causality and epistemology. Machamer and McGuire trace the implications of these changes and others that follow from them, including Descartes's rejection of the method of abstraction as a means of acquiring knowledge, his insistence on the infinitude of God's power, and his claim that human knowledge is limited to that which enables us to grasp the workings of the world and develop scientific theories.