Abstract

The 17th century's new science and new philosophy was roughly equally divided between Cartesians and Gassendists. Scholars agree that understanding Gassendi's metaphysics, epistemology and scientific method is crucial for understanding the development of modern philosophy, as Gassendis version of Epicureanism provides a third strand of influence on modern philosophy paralleling Cartesianism and scholasticism. Despite this, Gassendi is rather little understood today. I look at Gassendi in the context of his Objections and Counter-Objections to the Meditations, along with Descartes' Replies. This context provides an explicit display of the opposition between two main strands of the new philosophy. I argue---contra a popular characterization of Gassendi's thought as primarily skeptical or even wholly unsystematic---that Gassendi's objections derive from a systematic psychology and cannot be well understood without a grasp of this psychology. ;I begin with a central methodological question in the dispute, the status of clear and distinct perception and what this tells us about proper procedure. This disagreement has it source in competing accounts of the cognitive faculties. Hence I go on to develop an account of Gassendi's theory of the cognitive faculties, and in particular perception, the acquisition of ideas, and reasoning. I then examine Gassendi's initially rather puzzling objections to the cogito, which act as a test-case for my interpretation of Gassendi's theory of cognition. I end with the dispute over the mind-body relationship. Gassendi objects that Descartes has failed to give any more than a nominal definition of the mind, having failed to make intelligible the modes of the mind in terms of its essence. Gassendi, in contrast, seeks an account of the operations of the mind in terms of the micro-level structure of the parts of the brain, and understands this micro-level structure as the genuine essence of the mind. This objection provides an excellent case for examining how Descartes and Gassendi's rival psychologies influenced two very different notions of scientific method