Journal of the History of Philosophy

The book jacket copy claims that Cartesian Truth merits “serious consideration by both contemporary analytic philosophers and postmodern thinkers.” Yet the work is written in a decidedly analytic idiom, and it is keyed primarily to recent analytic discussions of [End Page 531] epistemological foundationalism. Moreover, what is most valuable is not its comments concerning the relevance of Descartes to these discussions, but rather its admirably clear rational reconstruction of Descartes’ own epistemology. In fact, this study usefully distinguishes two different but interrelated epistemological theories in Descartes. The first is connected to Descartes’ “project of pure inquiry” (to borrow Bernard Williams’ phrase), a project involving the attempt to derive truths a priori from the “rule of truth,” that is, the rule that whatever one clearly and distinctly perceives is true. The first three chapters of Vinci’s work consider this aprioristic project. The last four chapters focus on the project in Descartes of providing an epistemology of sense experience that allows for nonintellectual knowledge of the material world. Vinci makes some original and insightful claims about these projects and their interconnections.

Vinci begins by defending a reading of the rule of truth which requires (roughly) that clearly and distinctly perceived properties exist in a substance either eminently or formally. One may doubt whether Vinci has succeeded in his stated goal of providing a “defense” of this rule (208), especially since he makes no attempt, as far as I can tell, to offer a transcendental argument for the substance/property metaphysic that the rule presupposes on his reading of it. However, this reading does reveal how that rule could provide a foundation for the causal principles that are essential to the argument for the existence of God in the Third Meditation. This discussion thus has the virtue of yielding a solution to the puzzle of why Descartes was so confident that these principles are revealed by the “light of nature.”

At the end of chapter 3, Vinci notes a well-known difference between the proof of the existence of the material world in the Sixth Meditation, which appeals to our “natural inclination” to believe that sensations come from bodies, and the version of that proof in the second part of the Principles of Philosophy, which appeals rather to a clear and distinct perception of material properties that is “stimulated by sense.” What is new and interesting in Vinci, however, is an explanation of this difference that appeals to Descartes’ commitment in the latter text to the view that nonintellectual “concrete intuitions” warrant claims concerning the existence of material substance and its properties. Vinci proposes that Descartes came to accept such a view because he adopted a revised version of the rule of truth that dictates that the properties we concretely intuit formally exist in a substance.

The second part of his study considers various issues connected to the notion of concrete intuition. There Vinci defends in particular the thesis that Descartes took such intuitions to pertain only to the imagination, and thus to differ in kind from sensations of secondary qualities such as color, temperature, and taste. At times he makes the stronger claim that Descartes “never speaks of sensations” of primary qualities such as “size, shape, and so on” (102). There is, however, a notable counterexample to such a claim in the Comments on a Certain Broadsheet, which lists as innate sensory ideas not only those of pains, colors and sounds but also those of shapes and motions. I found Vinci’s own discussion of this passage (148–51) to be uncharacteristically confused. Nonetheless, one could distinguish between the sensory perception of the extension of, say, a particular colored patch, on the one hand, and the imaginative perception of extension as a common sensible, on the other. One could then conclude, in line with Vinci’s own [End Page 532] position, that Descartes took only the latter sort of perception to count as a concrete intuition, and thus to fall under the revised version of the rule of truth.

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