Abstract

In this paper I argue that the early Kant’s Physical Monadology (1756)—which attempts to solve the philosophical problem of reconciling the infinite divisibility of space with the substantial status of material bodies—is best understood within the framework of substance–accident ontology. I begin by showing how Kant relies on that ontology when arguing that composition as a relation can be taken away, leaving us with simple substances or monads. After this, I discuss apparently conflicting two interpretative camps considering the “force by which the simple element of a body occupies its space” (1:482). Given that neither of them is satisfactory, I explain the way in which Kant’s theory of grounds, positing, and determinations draws on the Aristotelian theory of substances, essences, and necessary and non-necessary accidents. In causal terms, this framework amounts to a theory of powers in which both the internal determinations constitutive of a substance and the accidents they posit are causally efficacious. This enables us to see that the existing interpreting camps result from highlighting different aspects of Kant’s quite nuanced theory of monadic powers. To express that theory economically, it can be called a dual layer theory of power: monads are (1) essentially powerful substances that bring about (2) three kinds of powers—repulsive, attractive, and inertial—as accidents; from these accidents, in turn, result such properties as impenetrability, volume, shape, and cohesion. In virtue of the latter type of powers, a monad most importantly has a determinate sphere of influence by which it occupies space and prevents other things penetrating the space it fills—thereby entering in the mechanical world of bodies. The defended interpretation can thus reveal the full nature of the early Kant’s fine-grained theory of monadic powers and show it to be quite understandable in its ingenious use of a time-honored ontological framework in a post-Newtonian setting.