Abstract

The physician Louis de La Forge built his entire work upon the promotion, defensce, and completion of Descartes’ thought. In the course of this endeavor, he sought to refute the notion that knowledge of the mechanisms of the living body is the necessary condition for producing such mechanisms. Around the same time, Arnold Geulincx formulated the principle Quod nescis quomodo fiat id non facis, according to which an effect can only be produced only by someone who knows how it is produced. Geulincx developed this principle within a Cartesian framework, and it soon became a cornerstone of arguments supporting oOccasionalism from a Cartesian perspective. La Forge instead upheld the opposite thesis, yet still on the basis of ideas drawn from Cartesian philosophy. In doing so, La Forge intended to defend Descartes’ physiology against a form of vitalism which was fueling the opposition to Cartesian science in Parisian philosophical and scientific circles, and which found a prominent champion in the physician Cureau de La Chambre.