Stephen Puryear

In this work Thomas surveys the contributions of (pre-Kantian) early modern philosophy to our understanding of the mind. She focuses on the six canonical figures of the period -- Descartes, Spinoza, Locke, Leibniz, Berkeley, and Hume -- and asks what each has to say about five topics within the philosophy of mind. The topics are (1) the ontological status of mind, (2) the scope and nature of self-knowledge, (3) the nature of consciousness, (4) the problem of mental causation, and (5) the nature of representation or intentionality. The overarching aim of the book is to show that the theories articulated by these thinkers are not just historical curiosities, but have much to contribute to our understanding of these topics today.

I propose a straightforward reconciliation of Leibniz’s conception of bodies as aggregates of simple substances (i.e., monads) with his doctrine that bodies are the phenomena of perceivers, without in the process saddling him with any equivocations. The reconciliation relies on the familiar idea that in Leibniz’s idiolect, an aggregate of Fs is that which immediately presupposes those Fs, or in other words, has those Fs as immediate requisites. But I take this idea in a new direction. Taking notice of the fact that Leibniz speaks of three respects in which one thing may immediately presuppose others--i.e., with respect to its being, its existence, and its reality--I argue that a phenomenon having its being in one perceiving substance (monad) can plausibly be understood to presuppose other perceiving substances (monads) in two of these respects. Accordingly, good sense can be made of both the claim that a phenomenon in one monad is an aggregate of other monads (in Leibniz’s technical sense of 'aggregate') and the (equivalent) claim that the latter monads are constituents of the phenomenon (in his technical sense of 'constituent'). So understood, the two conceptions of body are perfectly compatible, just as Leibniz seems to think.