Lisa Downing

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.

I. Introduction Siris, Berkeley's last major work, is undeniably a rather odd book. It could hardly be otherwise, given Berkeley's aims in writing it, which are three-fold: 'to communicate to the public the salutary virtues of tar-water,'1 to provide scientific background supporting the efficacy of tar-water as a medicine, and to lead the mind of the reader, via gradual steps, toward contemplation of God.2 The latter two aims shape Berkeley's extensive use of contemporary natural science in Siris. In particular, Berkeley's focus on what he calls fire (or aether or light) as a quasiuniversal 'cause' of natural change3 serves these purposes, for the 'activity' of the aether, in his view, can both explain the miraculous virtues of a certain medicine, i.e. tar-water, and reveal God's action and his divine order.4 Berkeley's corpuscular speculations, including his use of fire-theory, are not especially idiosyncratic as natural philosophy. In his theorizing, as Jessop and other have noted, he is heavily indebted to the work of Hermann Boerhaave, the Dutch chemist, botanist, and physician whose teachings were highly influential in mid-eighteenth century Britain.5 Boerhaave, along with other Dutch natural philosophers cited by Berkeley, assigned a central role in accounting for physio-chemical activity to fire, a subtle, insensible particulate substance, sometimes identified with light.

Although George Berkeley himself made no major scientific discoveries, nor formulated any novel theories, he was nonetheless actively concerned with the rapidly evolving science of the early eighteenth century. Berkeley's works display his keen interest in natural philosophy and mathematics from his earliest writings (Arithmetica, 1707) to his latest (Siris, 1744). Moreover, much of his philosophy is fundamentally shaped by his engagement with the science of his time. In Berkeley's best-known philosophical works, the Principles and Dialogues, he sets up his idealistic system in opposition to the materialist mechanism he finds in Descartes and Locke. In De Motu, Berkeley refines and extends his philosophy of science in the context of a critique of the dynamic accounts of motion offered by Newton and Leibniz. And in Siris, Berkeley's flirtation with neo-Platonism draws inspiration from the fire theory of Boerhaave as well as Newton's aetherial speculations in the Queries of the Optics. In examining Berkeley's critical engagement with the natural philosophy of his time, we will thus improve our understanding of not just his philosophy of science, but of his philosophical corpus as a whole.

The prominent place 0f corpuscularizm mechanism in L0ckc`s Essay is nowadays universally acknowledged} Certainly, L0ckc’s discussions 0f the primary/secondary quality distinction and 0f real essences cannot be understood without reference to the corpuscularizm science 0f his day, which held that all macroscopic bodily phenomena should bc explained in terms 0f the motions and impacts 0f submicroscopic particles, 0r corpuscles, each of which can bc fully characterized in terms of 21 strictly limited range 0f (primary) properties: size, shape, motion (or mobility), and, perhaps, solidity 0r impcnctrability.2 Indeed, L0ckc’s lists 0f primary quali-.

While De Motu, Berkeley's treatise on the philosophical foundations of mechanics, has frequently been cited for the surprisingly modern ring of certain of its passages, it has not often been taken as seriously as Berkeley hoped it would be. Even A.A. Luce, in his editor's introduction to De Motu, describes it as a modest work, of limited scope. Luce writes: The De Motu is written in good, correct Latin, but in construction and balance the workmanship falls below Berkeley's usual standards. The title is ambitious for so brief a tract, and may lead the reader to expect a more sustained argument than he will find. A more modest title, say Motion without Matter, would fitly describe its scope and content. Regarded as a treatise on motion in general, it is a slight and disappointing work; but viewed from a narrower angle, it is of absorbing interest and high importance. It is the application of immaterialism to contemporary problems of motion, and should be read as such. ...apart from the Principles the De Motu would be nonsense.1..

Locke’s metaphysical commitments are a matter of some controversy. Further controversy attends the issue of whether and how Locke adapts his views in order to accommodate the success of Newton’s Principia. The chapter lays out an interpretation of Locke’s commitments according to which Locke’s response to Newton on gravity does not require the positing of brute powers and is consistent with his core essentialism. The chapter raises the question of how the hypothesis concerning the creation of matter, alluded to at 4.10.18, fits with these commitments. The chapter concludes that the De grav hypothesis would represent a significant revision to the background metaphysical picture of the Essay, but that nevertheless its attractions to Locke are intelligible and illuminating.

One of the deepest tensions in Locke’s Essay, a work full of profound and productive conflicts, is one between Locke’s metaphysical tendencies—his inclination to presuppose or even to argue for substantive metaphysical positions—and his devout epistemic modesty, which seems to urge agnosticism about major metaphysical issues. Both tendencies are deeply rooted in the Essay. Locke is a theorist of substance, essence, quality. Yet, his favorite conclusions are epistemically pessimistic, even skeptical; when it comes to questions about how the world is constituted, our understandings cannot penetrate very far. Locke seems torn between metaphysics and modesty, between dogmatism and skepticism. This chapter will consider two specific examples of this sort of tension. The first involves the ontology of body, and the second, the ontology of mind. The conflict concerning bodily natures looks like this: As is well-known, Locke typically describes bodies in the terms of the corpuscularian science of his day, as exemplified especially by the natural philosopher Robert Boyle. Locke’s characterizations of the real essences of bodies are mechanist. He envisions them as corpuscularian textures-- spatial arrangements of particles possessing size.

The rich connections between metaphysics and natural philosophy in the early modern period have been widely acknowledged and productively mined, thanks in no small part to the work of Margaret Wilson, whose book, Descartes, served as an inspirational example for a generation of scholars. The task of this paper is to investigate one particular such connection, namely, the relation between occasionalist metaphysics and strict mechanism. My focus will be on the work of Nicholas Malebranche, the most influential Cartesian philosopher after Descartes himself. I begin with two crucial facts about Malebranche’s philosophy: (1) Malebranche was an occasionalist, that is, he held that God was the only true cause, that all modifications of bodies and of minds can be produced by God alone. (2) Malebranche adhered firmly to strict mechanism. By strict mechanism, I mean the view, found most prominently in Descartes and in Boyle’s more ideological writings, that the qualities of bodies are exhausted by a very short list (size, shape, motion, and perhaps solidity) and that, most importantly, bodies interact only at contact by impact. Another way of describing this “contact action” requirement is as the thesis that the only fundamental laws of physics are laws of inertial motion and laws of the communication of motion at impact. In..

Both Immanuel Kant and Paul Guyer have raised important concerns about the limitations of Lockean thought. Following Guyer, I will focus my attention on questions about the proper ambitions and likely achievements of inquiry into the natural/physical world. I will argue that there are at least two important respects, not discussed by Guyer, in which Locke’s account of natural philosophy is much more flexible and accommodating than may be immediately apparent. On my interpretation, however, one crucial source of a too-limited vision of natural philosophy remains in Locke, where he is appropriately criticized by both Kant and Guyer. My method will be to begin with a distinction that Locke draws in the very first draft of the Essay, between what he calls “the sensible object” and, on the other hand, “the uncertain philosophical cause.” I believe that Locke’s notion of “sensible object,” as opposed to uncertain philosophical cause, retains a central place in his thought in the published Essay, despite the fact thateven though this contrast is never made explicitly there. Tracing the evolution of these two concepts in his thought will allow us to track and better understand his developing views about the relation between the project of the.

Pierre Louis Moreau de Maupertuis’ famous and influential Discours sur les différentes figures des astres, which represented the first public defense of attractionism in the Cartesian stronghold of the Paris Academy, sometimes suggests a metaphysically agnostic defense of gravity as simply a regularity. However, Maupertuis’ considered account in the essay, I argue, is much more subtle. I analyze Maupertuis’ position, showing how it is generated by an extended consideration of the possibility of attraction as an inherent property and fuelled by an understanding of Lockean skepticism about knowledge of real essences that is more nuanced perhaps even than Locke’s own.

That corpuscularianism played a critical role in Locke’s philosophical thought has perhaps now attained the status of a truism. In particular, it is universally acknowledged that the primary/secondary quality distinction and the conception of real essence found in the Essay Concerning Human Understanding cannot be understood apart from the corpuscularian science of Locke’s time.1 When Locke provides lists of the primary qualities of bodies,2 the qualities that “are really in them whether we perceive them or no,” those lists show strong resemblances to Robert Boyle’s views about the “primary affections” of matter, as expressed in such influential programmatic works as On the Origin of Forms and Qualities.3 Moreover, Locke’s conception of the real essences of bodies, the inner constitutions which serve as the causal sources of all their properties, typically appears to be a corpuscularian one.4 Nevertheless, the question of the nature of Locke’s philosophical allegiance to corpuscularianism remains a controversial one.5..

George Berkeley, Bishop of Cloyne, was one of the great philosophers of the early modern period. He was a brilliant critic of his predecessors, particularly Descartes, Malebranche, and Locke. He was a talented metaphysician famous for defending idealism, that is, the view that reality consists exclusively of minds and their ideas. Berkeley's system, while it strikes many as counter intuitive, is strong and flexible enough to counter most objections. His most studied works, the Treatise Concerning the Principles of Human Knowledge Principles, for short) and Three Dialogues between Hylas and Philonous Dialogues), are beautifully written and dense with the sort of arguments that delight contemporary philosophers. He was also a wide ranging thinker with interests in religion (which were fundamental to his philosophical motivations), the psychology of vision, mathematics, physics, morals, economics, and medicine. Although many of Berkeley's first readers greeted him with incomprehension, he influenced both Hume and Kant, and is much read (if little followed) in our own day.

With Spirits and Clocks, Dennis Des Chene completes a two-part project begun with Life’s Form: Late Aristotelian Conceptions of the Soul. In both volumes, Des Chene is concerned with the question of what makes living things living. For the Jesuit Aristotelians, the answer requires a complex analysis of the ontology of soul and power. For Descartes, of course, the answer is completely different; arguably, there is a sense in which his answer is: nothing. Indeed Des Chene does argue this, concluding that for Descartes there are no living things in the Aristotelian sense: the body machine does not live, because it has no powers; the soul does not live because it has no role in nutrition, growth, and generation. Descartes’s physiology thus represents the most radical aspect of his natural philosophy, for he must eliminate souls from living things as part of the general project of eliminating Aristotelian forms from nature. As such, the importance of Descartes’s physiology is manifest; Des Chene’s study is a very welcome and original addition to the still-modest philosophical literature engaged with Descartes’sL’Homme and La description du corps humain.

In lieu of an abstract, here is a brief excerpt of the content:Reviewed by:Interpreting Arnauld ed. by Elmar J. KremerLisa DowningElmar J. Kremer, editor. Interpreting Arnauld. Toronto: University of Toronto Press, 1996. Pp. xi + 183. Cloth, $65.00.This attractive volume represents (with one exception) the proceedings of what was evidently a lively colloquium on Arnauld’s philosophy, held at the University of Toronto in 1994 to commemorate the three-hundredth anniversary of his death. Although Antoine Arnauld has been best known to contemporary philosophers as the author of the fourth set of objections to Descartes’ Meditations, interest in Arnauld’s own philosophical thought appears to be on the rise within the Anglo-American philosophical community, as indicated by the publication, within the last eight years, of two new translations of his Des vrayes et des fausses idées (a philosophical polemic against Malebranche) and a new translation of the Port-Royal Logic that Arnauld co-authored with Pierre Nicole. This new collection, from an international group of contributors, is thus well-timed. The two main themes that emerge from the collection as a whole serve to indicate the potential importance of Arnauld scholarship to our understanding of seventeenth century philosophy.The first theme that unites most of the papers is that of the diversity of views that existed within the constellation of philosophers who identified in one way or another with the doctrines of René Descartes. Arnauld was, of course, one such Cartesian. Nevertheless, many of the papers take the differences between Descartes and Arnauld as their starting point. Peter Schouls sets up a general contrast between the modernity of Descartes’ thought, as founded on the validity of subjective consciousness, and the tradition-grounded character of Arnauld’s philosophy. Jill Vance Buroker focuses productively on Arnauld’s and Descartes’ opposing views on the nature of assertion and judgment. Alan Nelson uses Arnauld’s challenge to Descartes’ account of the material falsity of ideas as the basis for a controversial but fascinating reassessment of a range of crucial issues in Descartes scholarship: clarity and distinctness, objective reality, and representation, as well as material falsity. Jean-Luc Solère’s contribution (described further below) documents the fact that significant philosophical debates existed, not [End Page 367] just within Cartesianism, but even within the still narrower Jansenist community that agreed in taking Augustine and Descartes as their philosophical models. In thus highlighting and documenting the diversity and richness of Cartesianism, the collection provides a valuable contribution to the history of philosophy. This theme is also very much present in the essays by Ndiaye, Kremer, and Carraud, which are discussed below.The second theme, shared by the majority of the papers, is that of philosophical theology. As Elmar Kremer remarks in his editor’s introduction (p. ix), while Arnauld himself held that philosophy and theology are distinguishable disciplines, the volume as a whole documents their many interconnections in his work. These interconnections are especially well brought out in the contributions by Kremer, Solère, and Sleigh. Kremer argues that we can understand three of Arnauld’s key departures from Descartes (with respect to the nature of body, the production of sensory ideas, and divine omnipotence) as motivated by his Christian commitments. Solère contends, in his intricate and illuminating essay, that Arnauld’s views about the metaphysical status of known truths (that they are relations in our minds, rather than entities in God grasped by us) are connected to a debate about the savability of non-Christians, and that his disputant, Pierre Nicole, developed an account of implicit or indirect knowledge in order to accommodate his commitment to general grace, a divine illumination had by everyone. Robert Sleigh’s essay considers the difficult question of how Arnauld wished to reconcile his doctrine of efficacious grace with human freedom: Arnauld clearly advocated some sort of compatibilism, but what sort, exactly? Although Sleigh admits that he cannot give an unambiguous defense of a single answer, his map of the territory is very valuable indeed. Other topics in philosophical theology touched on in the collection are the epistemology of papal infallibility (discussed by Thomas Lennon), miracles (discussed by Graeme Hunter) and divine omnipotence. This last topic (which is connected both to the question of the...

The Cambridge Companion to Locke now joins the long list of titles available in this excellent series. As we have come to expect, the contributors to this Companion are distinguished and the result is comprehensive and eminently useful. This volume is one of the more accessible in the series, with most of the chapters pitched at a level accessible to advanced undergraduates and especially helpful to beginning graduate students. Many of the chapters will be of considerable interest to scholars; here I myself think especially of Edwin McCann’s chapter on Locke’s philosophy of body, which considerably advances our understanding of the place of mechanism in Locke’s thought. In addition, the notes, selective bibliography, and index of passages cited will serve as resources for readers at all levels of expertise.

The prominent place of corpuscularian mechanism in Locke's Essay is nowadays universally acknowledged. Certainly, Locke's discussions of the primary/secondary quality distinction and of real essences cannot be understood without reference to the corpuscularian science of his day, which held that all macroscopic bodily phenomena should be explained in terms of the motions and impacts of submicroscopic particles, or corpuscles, each of which can be fully characterized in terms of a strictly limited range of properties: size, shape, motion, and, perhaps, solidity or impenetrability. Indeed, Locke's lists of primary qualities are quite consistent with those found in the work of his friend Robert Boyle, a prominent defender of the corpuscularian program; his real essences of substances appear to be corpuscular constitutions, arrangements of particles.