The defense of common sense in Berkeley's Three Dialogues is, first and foremost, a defense of the gardener's claim to know this cherry tree, a claim threatened by both Cartesian and Lockean philosophy. Berkeley's defense of the gardener's knowledge depends on his claim that the being of a cherry tree consists in its being perceived. This is not something the gardener believes; rather, it is a philosophical analysis of the rules unreflectively followed by the gardener in his use of the (...) word 'exists'. It is by following these rules that the gardener gains knowledge of the cherry tree. Uncovering these deep connections between Berkeley's epistemology and his philosophy of language and placing them in the context of his critique of both Cartesian and Lockean philosophy will clarify Berkeley's strategy for bringing his reader back to common sense and practical engagement in the ordinary affairs of life. (shrink)

The ArgumentThe main subject examined in this paper is Immanuel Kant's controversy withPhilosophisches Magazinregarding Kant's new theory of judgments. J. A. Eberhard, editor ofPhilosophisches Magazin, and his colleagues wanted to vindicate the Wollfian traditional concept of judgments by undermining Kant's claims. As will be demonstrated, their arguments were effective mainly in exposing the ambiguity that was inherent in Kant's concept of the synthetic a priori; an ambiguity that resulted from Kant's desire—central to his critique of metaphysics—to present judgments pertaining to (...) mathematics, (dogmatic) metaphysics, and pure natural science as judgments which shared a common form. Exposing this ambiguity was not the intended result, and it was insufficient for the purpose of vindicating the Wollfian tradition. The contributors toPhilosophisches Magazinignored the important properties shared by the class of judgments falling under Kant's concept of synthetic a priori judgments. They also ignored the fact that their position was unable to account for the logical phenomena that motivated Kant to present a new theory of judgments. On the other hand, Kant's theory of judgments was insensitive to the important differences that exist among the distinct types of judgments falling under his concept of a synthetic a priori judgment. This latter point is clearly shown in the controversy regarding the novelty of Kant's concept of a synthetic a priori judgment, and in the controversy regarding the function of intuitions within synthetic judgments.A result of the controversy was that Kant's concept of the synthetic a priori, which he believed to be an exact concept, was revealed to be a metaphor: no more than an invitation to view certain intellectual fields in the light of others. On the other hand, Eberhard and his colleagues failed to come up with satisfactory answers to Kant's questions within their traditional concept of judgment. Both parties refused to acknowledge this result. Consequently, the search for a new logic, a new architectonic order, and a new unity within reason became a general problem for the new generation of philosophers. (shrink)

In the Optics, Descartes claims that telescopes and microscopes lead to morally certain knowledge. It is unclear, however, that Descartes’s expressed confidence in these instruments is warranted. In this article, I show how a limited range of telescope and microscope observations could lead to morally certain knowledge for Descartes, and how observations beyond this range admit of enough reasonable doubt to undermine moral certainty. I also explain moral certainty as a form of knowledge in Descartes’s scientific practices, his epistemic commitment (...) to optical instruments, and I offer an explanation for why Descartes never used optical instruments in his scientific endeavours. -/- ---- -/- Dans la Dioptrique, Descartes prétend que les télescopes et les microscopes donnent accès à des connaissances moralement certaines. Cependant, il n’est pas certain que la confiance accordée par Descartes à ces instruments soit justifiée. Dans cet article, je montre comment une gamme limitée d’observations effectuées à l’aide d’instruments d’optique pourraient mener aux connaissances moralement certaines pour Descartes, et comment d’autres observations allant au-delà de cette gamme introduisent suffisamment de doute raisonnable pour saper cette certitude morale. Enfin, j’interprète la certitude morale comme une forme de connaissance dans l’empirisme de Descartes, j’explique son engagement épistémique envers les instruments d’optique, et j’éclaire les raisons pour lesquelles il n’a jamais employé d’instruments d’optique dans ses propres recherches scientifiques. (shrink)