  It is widely accepted that Leibniz’s primitive forces are supposed to serve as the intelligible metaphysical grounds for the forces that are of concern in physics, and more specifically that active derivative forces are to be grounded in active primitive forces while passive derivative forces are to be grounded in passive primitive forces. Furthermore, there is no denying that Leibniz sees his distinction between active and passive primitive forces as being in some way analogous to the distinction between Aristotelian form and matter. Thus in the Specimen, he tells us that “primitive [active] force (which is nothing but the first entelechy) corresponds to the soul or substantial form [of the scholastics]” while “the primitive force of being acted upon or of resisting constitutes that which is called primary matter in the schools” (GM VI.236–237/AG 119–120). What has remained less certain is the answer to the question, “Where, as it were, does Leibniz think active and passive primitive forces are located?” 