Abstract

Whatever may be its other sins, the history of philosophy cannot be faulted for the fleetingness of its memory: "modern" philosophy, after all, is supposed to begin with a figure born 400 years ago, René Descartes. Indeed, even the view that it began then can trace its ancestry back to Descartes. But it would be historically naïve simply to agree with Descartes's self-congratulatory myth of creating a new philosophy ex nihilo. His achievement was a tremendous one, rightfully seen as provoking a sea-change in the history of philosophy, but it was accomplished as much by reflecting on what had gone before as by any other means. One area where Descartes induced the philosophical seas to change can be found in the understanding of causation, and there Descartes clearly took issue with his predecessors, particularly his scholastic predecessors. His quarrel with scholastic natural philosophy over the place of final causes is already well-known, but Descartes took aim just as frequently at the scholastic theory of species, a theory that is a response primarily to questions about "formal" causation in perception and conception. This is in spite of the use Descartes himself sometimes made of 'form': both in such mysterious notions as formal reality and in such supposedly de-mystified ones as the mathematically describable shape of parts of extension. But he did expressly reject the theory of species, and much of the metaphysics that went with it, thereby putting the role and importance of formal causation up for grabs, and changing the nature and range of acceptable explanation in many areas.