 Louis de la Forge was among the first group of self-styled disciples to edit and disseminate the writings of Descartes in the years immediately following his death in Sweden (1650). La Forge initially used his medical training to comment on Cartesian physiology. He also wrote the first monograph on Descartes’ theory of the human mind, in which he defended substance dualism and proposed a theory of occasional causation that was adopted and developed by other Cartesians, including Malebranche.