Donald Rutherford

In lieu of an abstract, here is a brief excerpt of the content:Journal of the History of Philosophy 39.4 (2001) 591-592 [Access article in PDF] J. A. Cover and John O'Leary-Hawthorne. Substance & Individuation in Leibniz. Cambridge: Cambridge University Press, 1999. Pp. x + 307. Cloth, $59.95. This close engagement with Leibniz's modal metaphysics is as rewarding as it is challenging. Crisply written and tightly argued, the book aims to achieve a balance between what the authors describe as their historical objective—to ascertain Leibniz's views on individuation against the backdrop of scholastic philosophy—and their philosophical goal—to investigate the issue of individuation more generally by construing Leibniz as a mediary between scholastic and modern metaphysics (4). The result is an original, if at times contentious, reinterpretation of some of the central tenets of Leibniz's philosophy.Since a full discussion of the work is beyond the scope of this review, we focus on one principal line of argument that supports much of what the authors say about Leibniz. Although in early texts Leibniz occasionally shows sympathy for a relational view of individuation (59-63), his dominant position (developed in the seminal Disputatio metaphysica) is that a substance's principle of individuation is wholly internal to it. For the authors, this becomes a benchmark for the interpretation of Leibniz's later philosophy. On their reading, Leibniz's account of individuation rests on two main theses: "the requirement of separability" (that the existence of any substance is metaphysically independent of that of any other substance except God) and "the requirement that whatever individuates a substance must be wholly internal to it" (87).These theses are heavy with consequences. Concerning the ontological status of relations and relational properties (or extrinsic denominations) the authors convincingly argue that Leibniz embraces a reductionist position, according to which relational properties supervene on a substance's intrinsic accidents, i.e., its perceptions and appetitions. Monadic facts about substances suffice to determine all relational facts, and the latter cannot change without a change in the former (though the converse does not hold). Emphasizing Leibniz's statement that God sees in a complete concept the "foundations" of all that can be predicated of a substance, the authors add to this the more controversial claim that extrinsic denominations are not included in the complete concept of an individual substance (83-4). Thus, the identity of any substance is defined by the totality of its intrinsic denominations, and these in turn determine the relations that hold among substances.The centerpiece of the book addresses the modal dimension of Leibniz's theory of individuation. Here the authors argue that Leibniz adheres to what they call "strong essentialism" rather than "superessentialism." The former, like the latter, holds that a substance could not have a complete concept different than the one it has. However, as a "strong essentialist" Leibniz denies that all of a substance's properties are essential to it. Based on their reading of Leibniz's doctrine of relations, the authors maintain that all and only intrinsic denominations are essential to a substance. From this they infer that Leibniz allows for the transworld identity of substances: the same substance can exist in different possible worlds, worlds distinguished by the fact that they contain different constituent substances. This is possible, according to the authors, because the "laws of harmony" impose no constraint on which substances can coexist in a world. A possible world is defined by the collection of individuals supposed to exist in it, and laws [End Page 591] of harmony are merely relational truths supervening on those substances' intrinsic accidents (109).The authors are candid in admitting that their interpretation cannot be reconciled with all of Leibniz's texts. Their goal instead is to give Leibniz the best he can get, metaphysically speaking: "Our efforts here are to show that the architectonic of Leibniz's own metaphysics is properly captured by strong essentialism, that the important and deepest threads of his thinking better hang together on that construal" (103). Yet one might take issue with their view of what count as Leibniz's "deepest" thoughts. Surely it is a...

In lieu of an abstract, here is a brief excerpt of the content:Reviewed by:The Cambridge History of Seventeenth-Century Philosophy by Daniel Garber, Michael AyersDonald RutherfordDaniel Garber, Michael Ayers, editors. The Cambridge History of Seventeenth-Century Philosophy. 2 vols. Cambridge: Cambridge University Press, 1998. Pp. xii + 1616. Cloth, $175.Over a decade in preparation, this latest addition to the Cambridge History of Philosophy is an enormous achievement—both in its size and the contribution it makes to redefining [End Page 165] the landscape of seventeenth-century philosophy. The editors make no bones about their intention to rewrite the history of early modern philosophy, reversing the trend dominant through much of this century of reading seventeenth-century philosophers in the light of twentienth-century “interests and preconceptions” (4). As they note, the movement to historicize our understanding of seventeenth-century philosophy has been underway for some time in the English-speaking world, furthered in many cases by contributors to these volumes. From this perspective, the present work represents, if not the culmination, at least a progress report on these efforts and the success they have achieved.As in previous volumes of the Cambridge History, the subject matter is treated thematically. Consistent with their larger goal, the editors have further attempted to organize the volumes in a way that remains faithful to the expectations of the period. Part I sets the stage with chapters that establish the larger social and historical context: “The institutional setting” (Richard Tuck); “The intellectual setting” (Stephen Menn); and “European responses to non-European culture: China” (D.E. Mungello). For the rest, the editors write, “the structure of the collection corresponds to one way, at any rate, in which an educated European of the seventeenth century might have organized the domain of philosophy” (2). First comes logic (including method and general ontology); then, the primary categories of being (God, body, soul); finally, the basic operations of the soul (understanding, will, action), whose treatment comprehends the topics of epistemology and ethics.Part II, “Logic, Language, and Abstract Objects,” opens with three short chapters by Gabriel Nuchelmans that survey the terrain of seventeenth-century logic according to the traditional divisions of term, proposition/judgment, and argument. These are followed by contributions on “Method and the study of nature” (Peter Dear); “Universal, essences, and abstract entities” (Martha Bolton); and “Individuation” (Udo Thiel).The discussion of metaphysics proper begins in Part III with the most fundamental being: God. Included here are chapters that examine specific theological issues—“The idea of God” (Jean-Luc Marion); “Proofs of the existence of God” (Jean-Robert Armogathe); “The Cartesian dialectic of creation” (Thomas M. Lennon)—as well as ones that deal more broadly with the crucial connection between philosophy and religion: “The relation between theology and philosophy” (Nicholas Jolley) and “The religious background of seventeenth-century philosophy” (Richard Popkin).Part IV, “Body and the Physical World,” forms the single largest part of the book and its intellectual core. It opens with two chapters—“The scholastic background” (Roger Ariew and Alan Gabbey) and “The occultist tradition and its critics” (Brian Copenhaver)—that effectively mark out the boundaries of the “new philosophy” that emerges in conjunction with the development of seventeenth-century science. These are followed by a series of chapters that examine particular features of that philosophy: “Doctrines of explanation in late scholasticism and in the mechanical philosophy” (Steven Nadler); “New doctrines of body and its powers, place, and space” (Daniel Garber, John Henry, Lynn Joy, and Alan Gabbey); “Knowledge of the existence of body” (Charles McCracken); “New doctrines of motion” (Alan Gabbey); “Laws of nature” (J.R. Milton); and “The mathematical realm of nature” (Michael Mahoney). [End Page 166]The final section of Volume I takes up the third main category of being: “Spirit.” It begins with Daniel Garber’s overview of the positions of the major figures, “Soul and mind: Life and thought in the seventeenth century,” followed by chapters on “Knowledge of the soul” (Charles McCracken); “Mind-body problems” (Daniel Garber and Margaret Wilson); “Personal identity” (Udo Thiel); and “The passions in metaphysics and the theory of action” (Susan James).Volume II of the History is devoted to topics that, in one way or another, elaborate operations of the soul. Part V, “The...

A number of recent authors have raised the question of Leibniz’s commitment, during the 1680s and after, to the reality of corporeal substances. In contrast to the standard reading of him as embracing early on a view of substance which is in all essential respects that of the “Monadology”, it has been argued that Leibniz is in fact inclined to recognize two distinct types of substance: on the one hand, unextended soul-like substances ; on the other hand, quasi-Aristotelian corporeal substances. Some commentators have seen Leibniz as deciding definitively by the late 1690s in favor of the monadic theory. Others, however, have argued for a more complicated reading of his development, seeing Leibniz as struggling with the problem of corporeal substance for much of his career.