Descartes notoriously characterizes substance in two ways: first, as an ultimate subject of properties ; second, as an independent entity. The characterizations have appeared to many to diverge on the definition as well as the scope of the notion of substance. For it is often thought that the ultimate subject of properties need not—and, in some cases, cannot—be independent. Drawing on a suite of historical, textual, and philosophical considerations, this essay argues for an interpretation that reconciles Descartes's two characterizations. It (...) proposes that both characterizations invoke a type of independence that obtains just in case there is no relation to another entity that holds by the nature of the entity in question. Even though the ultimate subject of properties is sometimes not independent in other respects, it satisfies this independence-by-nature condition. (shrink)

Descartes and Boyle were the most influential proponents of strict mechanist accounts of the physical world, accounts which carried with them a distinction between primary and secondary (or sensible) qualities. For both, the distinction is a piece of natural philosophy. Nevertheless the distinction is quite differently articulated, and, especially, differently grounded in the two thinkers. For Descartes, reasoned reflection reveals to us that bodies must consist in mere extension and its modifications, and that sensible qualities as we conceive of them (...) based on sense perception can pertain only to the mind. Just how we are supposed to arrive at this realization is, this essay will argue, a deep puzzle that brings us to the basic assumptions of Descartes' metaphysics. For Boyle, by contrast, while reflection can reveal the unique explanatory status of mechanism, and, thus, the primary/secondary quality distinction, only experience can confirm its truth. Our central focus will be on Descartes, and on the question: How does he intend to remove the sensible qualities from the physical world, how does he strip them from bodies? I will try to show that Descartes has an argument that he takes to show a priori that sensible qualities cannot be attributed to the material world (as foundational qualities, or, as we conceive of them based on sense experience). The argument fails, however, leaving him with at best a partly empirical case for removing the sensible qualities, based on the purported explanatory success of his physics. (shrink)

Jean-Luc Marion, in his latest book, “Sur la pensée passive de Descartes,” recently published in an English translation, challenges something he refers to, in the English subtitle, as “the Myth of Cartesian Dualism” and counters it with his original interpretation of Descartes’ notion of meum corpus. This article explores the reasons he adduces for this purpose. The case is made that Marion fails to provide sufficiently solid argumentative and textual support for his construal in this respect and that traditional substance (...) dualistic interpretative resources allow for a more straightforward and systematic reading. It is argued that Marion’s central dualism-deflecting claim, that in the Meditations, “my body” is not an extended thing but a mode of thought, is undermined by an analysis that carefully considers the context of those Descartes’ statements to which Marion appeals. (shrink)

Descartes argues that the mind and body are really distinct substances. He also insists that minds and bodies compose human beings. But how are mind and body united to compose a human? This question is crucial to understanding the place of human beings in Descartes’s ontology. Many scholars argue that Descartes has no solution to the unity problem, and they call into question the ontological status of mind-body composites. On some views, Cartesian humans are mere aggregates, like stacks of pancakes; (...) on other views, Descartes is not entitled to the view that humans exist at all. I argue that Descartes has a solution to the unity problem, and that he appropriates this solution from contemporaneous Jesuit discussions of soul-body unity—discussions that remain mostly unknown to contemporary scholars. The upshot is that Descartes has the metaphysical machinery to account for mind-body unity and doesn’t have to say that a human being is like a stack of pancakes. (shrink)