The Metaphysics of Leibniz’s New System

The 1695 publication of the “New System of the Nature of Substances and their Communication, and of the Union which Exists between the Soul and the Body” in the June 27 and July 4 issues of the Parisian Journal des sçavans marks an important milestone in Leibniz’s philosophical trajectory. It presented the first comprehensive public presentation of his metaphysics as it had matured over the preceding decades, and it would spark many lively exchanges and debates between Leibniz and his philosophical contemporaries in the decades to come. This chapter provides background regarding the text’s genesis and reception, and introduces its main philosophical themes. After highlighting some interpretative challenges raised by both the “New System’s” form and philosophical content, it goes on to explore two key elements of the metaphysical picture it advances: Leibniz’s account of individual substances, and his theory of the pre-established harmony between them.