Daniel Garber

Christia Mercer’s magnum opus, Leibniz’s Metaphysics: Its Origin and Development, long awaited, is finally about to appear from Cambridge University Press. It was well worth the wait. The book is impressive in the wealth of detailed argumentation and historical background that fills the work. Mercer’s general thesis is still that Leibniz’s mature thought emerges from a view that Leibniz shares with his teachers, an eclectic philosophy that sees truth lurking in many places, and that he sees the task of the philosopher as mining the past for its truths, and showing how the different philosophies can be made consistent with one another and made into a single system. As in her earlier work, the resolution of the conflict between Aristotelianism and the new mechanism is important. But Mercer also claims to have discovered something else utterly unexpected, a strong Platonistic strain in seventeenth-century German thought. While Aristotelianism and mechanism may have dominated thought about the physical world, Mercer has discovered strongly Platonistic strains in the conception of God and the soul, both in the young Leibniz and in his teachers. Even more surprising, Mercer argues that the main tenets of Leibniz’s mature thought emerged out of this mixture, and did so as early as 1670 and 1671. In particular, she argues that both the pre-established harmony and the idealism characteristic of his mature thought emerged in these years, as the result of an attempt to harmonize different elements of Aristotelian, Platonic, and mechanist philosophies, in response to particular problems in philosophy, theology, and even physics that gripped him at that time. If she is right, this will fundamentally alter our view of Leibniz.

Important to Kuhn's account of scientific change is the observation that when paradigms are in competition with one another, there is a curious breakdown of rational argument and communication between adherents of competing programs. He attributed this to the fact that competing paradigms are incommensurable. The incommensurability thesis centrally involves the claim that there is a deep conceptual gap between competing paradigms in science. In this paper I argue that in one important case of competing paradigms, the Aristotelian explanation of the properties of bodies in terms of matter and form as opposed to the Cartesian mechanist paradigm, where the properties of bodies are explained on the model of machines, there was no such conceptual gap: the notion of a machine was as fully intelligible on the Aristotelian paradigm as it was on the Cartesian. But this does not mean that the debate between the two sides was conducted on purely rational terms. Rational argument breaks down not because of Kuhnian incommensurability, I argue, but because of other cultural factors separating the two camps

This essay contends that Leibniz did not hold a position on the question of idealism in his middle period. He was neither an idealist nor antiidealist, but simply a Leibnizian. It considers some passages that have misled scholars into thinking that Leibniz was more sympathetic to idealism in his middle years than he actually was, and argues that these should be understood in a way that does not require the idealistic interpretation that they are usually given. Reflections on the real nature of Leibniz’s project during these years are presented.

Oxford University Press is proud to present the second volume in a new annual series, presenting a selection of the best current work in the history of philosophy. Oxford Studies in Early Modern Philosophy focuses on the seventeenth and eighteenth centuries - the extraordinary period of intellectual flourishing that begins, very roughly, with Descartes and his contemporaries and ends with Kant. It will also publish papers on thinkers or movements outside of that framework, provided they are important in illuminating early modern thought. The articles in OSEMP will be of importance to specialists within the discipline, but the editors also intend that they should appeal to a larger audience of philosophers, intellectual historians, and others who are interested in the development of modern thought.

The Cambridge History of Seventeenth-Century Philosophy offers a uniquely comprehensive and authoritative overview of early-modern philosophy written by an international team of specialists. As with previous Cambridge histories of philosophy the subject is treated by topic and theme, and since history does not come packaged in neat bundles, the subject is also treated with great temporal flexibility, incorporating frequent reference to medieval and Renaissance ideas. The basic structure of the volumes corresponds to the way an educated seventeenth-century European might have organised the domain of philosophy. Thus, the history of science, religious doctrine, and politics feature very prominently. The narrative that unfolds begins with an intellectual world dominated by a synthesis of Aristotelianism and scholastic philosophy, but by the end of the period the mechanistic or 'corpuscularian' philosophy has emerged and exerted its full impact on traditional metaphysics, ethics, theology, logic, and epistemology.