Abstract

In Principles I. 53, Descartes states what appears to be an important metaphysical principle: P1: Each substance has one principal property, which constitutes its nature and essence, and to which all its other properties are referred (AT VIIIA 25; CSM I 210).1 Marleen Rozemond calls this Descartes's "Attributes Premise", and it leads directly, as she points out, to Cartesian Dualism, the doctrine that a human mind and a human body, even when they belong to the same human being, are distinct substances (Rozemond forthcoming).