Abstract

The fifth chapter is a study of the emergence of ‘radical Cartesianism’ as an actor’s category in 1660s and 1670s, which prompted a further development of foundationalism as a reflection on the limits and proper method of philosophy. The key figure in this double process was De Raey, who in the late 1660s started to develop a new logic or metaphysics, intended to counter, on the one hand, the uses of Descartes outside natural philosophy and metaphysics itself, and on the other, the erosion of Descartes’s metaphysical tenets. His writings thus turn out to be relevant as he offers a mapping of the interpretations of Cartesianism covering its uses in theology (as by Meijer and Spinoza) and the spreading of Hobbes’s materialist philosophy in the Low Countries. Moreover, his logical-metaphysical theories embody a novelty in determining the aim of these disciplines, both with respect to the Cartesian tradition (i.e. to Clauberg and Geulincx) and to the Scholastic one, and start to assume a reflective role as they assess the limits of scientific knowledge. In his hands, logic and metaphysics become one discipline, as they have the same function, i.e. the definition of the principles of scientific knowledge (viz. the notions of physical and mental realities), and of its scope and applications. On the one hand, therefore, he can overcome the reduplication of metaphysics and ontology of Clauberg, and the introductory or didactic function that logic played both in Clauberg’s and Geulincx’s philosophy. On the other, his logical and metaphysical systematisation can be read as the result of a long-standing debate over the objects of these disciplines (either mere concepts, or entities existing outside mind), in which De Raey places himself by dealing with the theories of Burgersdijk and Ramus. This chapter thus works as a junction in the account of the establishment of Cartesianism as the philosophy of the university, and its challenges by emerging, alternative worldviews, interpretations and uses. Together, these converging theoretical and historical factors shaped a new, reflective function for logic and metaphysics.