Rodolfo Garau

In a famous inaugural speech delivered at the University of Zürich on 9 December 1922, What is a natural law?, Erwin Schrödinger pointed out the difficulty that the pioneers of quantum physics encountered in their attempt to introduce a nondeterministic conception of physical laws. Schrödinger defended a vision according to which natural regularities are the statistic result of particle interactions occurring by chance. Hence, the idea that nature is determined by necessity appeared to him as a sort of long-lived philosophical prejudice which was no longer supported by the most recent scientific advancements and which he thus intended to put into question. In his view, the strength behind the understanding of the physical world as absolutely necessitated stemmed from the authority of a millenary philosophical tradition:From where does the general, widespread belief in the absolute causal determinacy of molecular events and the conviction of the unthinkability of the contrary originate? Indeed, from the inherited millenary habit to think causally, which makes an undetermined event, an absolute, primary accident, appear as perfect nonsense to us.

This volume considers contingency as a historical category resulting from the combination of various intellectual elements – epistemological, philosophical, material, as well as theological and, broadly speaking, intellectual. With contributions ranging from fields as diverse as the histories of physics, astronomy, astrology, medicine, mechanics, physiology, and natural philosophy, it explores the transformation of the notion of contingency across the late-medieval, Renaissance, and the early modern period. Underpinned by a necessitated vision of nature, seventeenth century mechanism widely identified apparent natural irregularities with the epistemological limits of a certain explanatory framework. However, this picture was preceded by, and in fact emerged from, a widespread characterization of contingency as an ontological trait of nature, typical of late-Scholastic and Renaissance science. On these bases, this volume shows how epistemological categories, which are preconditions of knowledge as “historically-situated a priori” and, seemingly, self-evident, are ultimately rooted in time. Contingency is intrinsic to scientific practice. Whether observing the behaviour of a photon, diagnosing a patient, or calculating the orbit of a distant planet, scientists face the unavoidable challenge of dealing with data that differ from their models and expectations. However, epistemological categories are not fixed in time. Indeed, there is something fundamentally different in the way an Aristotelian natural philosopher defined a wonder or a “monstrous” birth as “contingent”, a modern scientist defines the unexpected result of an experiment, and a quantum physicist the behavior of a photon. Although to each inquirer these instances appeared self-evidently contingent, each also employs the concept differently.

Contentions about the origin of early modern empiricism have been floating about at least since the 1980s, where its exclusive “Britishness” was initially question, and the name of Gassendi was provocatively put forward as the putative “founder” of the current to the detriment of Francis Bacon. Recent scholarship has shown that early modern empiricism did not derive from philosophical speculation exclusively but had multiple sources and “foundations.” Yet, from a historical viewpoint, the question whether Bacon’s method had any influence on the origin and development of Gassendi’s version of empiricism still carries significance, for its answer may open up different views on how the relation between British and “continental” empiricisms shall be framed. In this paper, I deal with Gassendi’s reception of Bacon. On the basis of a deep examination of Gassendi’s corpus, I contend that there is no trace of a consistent influence of Bacon on Gassendi’s empiricism before 1650s; although I show that an indirect influence can be found through the mediation of Peiresc, I put forward the hypothesis that it was more the empirical attitude characterizing Peiresc’s intellectual figure, rather than his interest in Baconianism, to be relevant, along with Epicurus’ philosophy, for Gassendi’s early empiricism. I then analyze Gassendi’s treatment of Bacon’s logic in Gassendi’s Syntagma philosophicum. I show that despite Gassendi’s sympathy for Bacon’s project, his own logic lays on fundamentally different assumptions. Despite this, I argue for Gassendi’s reception of Bacon’s theory of the idols in Syntagma philosophicum. On this basis, I conclude by restating the untenability of “national” accounts of the rise of empiricism, and the importance of highlighting instead the sharing of ideas between its actors.

After reconstructing some features of the Scholastic treatment of contingency in natural philosophy, this paper draws a comparison between Descartes’ treatments of the issue of the laws of nature in Le Monde and in the Principles of Philosophy. On the basis of this comparison, it argues that elements of the Scholastic understanding of contingency as due to the impediment provided by matter are still present in the former. While in the Principles Descartes appears to equate contingency with an epistemological limitation in our understanding of the complexity of natural phenomena, in conclusion I argue that some elements of his previous approach to the issue remains in his treatment of curvilinear motion.

Introduction Conatus is a specific concept within Descartes’s physics. In particular, it assumes a crucial importance in the purely mechanistic description of the nature of light – an issue that Des- cartes considered one of the most crucial challenges, and major achievements, of his natural phil- osophy. According to Descartes’s cosmology, the universe – understood as a material continuum in which there is no vacuum – is composed of a number of separate yet interconnected vortices. Each of these vortices consists in a set of bands rotating around their centres. The bands are com- posed of corpuscles of the three elements, each distinguished on the basis of their different shapes and sizes. The small globules of the second element, although impeded by the other parts of heaven, strive to move away from the centre of the vortex around which they revolve, thus exerting a certain force against the surrounding bodies. This striving or conatus, though a mere force rather than a genuine motion, is transmitted instan- taneously and along straight lines from body to body. According to Descartes, then, the nature of light consists in this striving alone. This account must be understood as strictly connected to the fundamental laws that regulate the Cartesian world. It is particularly important to recall that for Descartes the centrifugal force exerted by a rotating body is understood to be a consequence of the intrinsic rectilinearity of every motion. As the second of the three Laws of Nature set forth in Book II of the Principles of Philosophy establishes, “all motion is in itself rectilinear; and hence any body moving in a circle tends to move away from the centre of the circle which it describes as proved by the fact that a stone rotating in a sling tends to move centrifugally along the tangent of each point described by a circle.1 Similarly, each of the globules of the second element “strives to recede with a great force from the centre of the vortex in which it rotates; it is in fact prevented by the other globules placed all around, not differently than a stone in a sling”. Within this framework, as I show later, conatus occurs when a body’s intrinsic tendency to rectilinear motion is impeded by an external constraint. As Stephen Gaukroger notes, the use of the term conatus in the Principles – like “vis” and “ action ” – shows that Descartes “cannot avoid dynamic terminology”, despite his declared intent “to construe motion in a purely kinematic way”. Indeed, Gaukroger observes that the notions of force action and striving are systematically employed in the Principles – appearing 290, 59 and 8 times, respectively. Also noteworthy, conatus was – together with the more familiar concepts of actio and vis – a significant element of the conceptual apparatus of Scholastic natural philosophy. As will be seen later – and this is the first goal of this paper – here the concept of conatus had a very specific function. Indeed, it was a central part of the Aristotelian- Scholastic account of gravitation. Conatus was used to refer to the striving of a body to move towards its natural place – especially in cases where its natural motion was hindered or impeded by an external mover. This specific use of the concept of conatus can be found in texts on natural philosophy from the end of the sixteenth through the late seventeenth century. Notably, it occurs in some of the late -Scho- lastic texts which held special significance for Descartes’s thought. Therefore, Descartes introduces conatus in a context in which this concept already had a very specific meaning, and one of which he was very probably aware. The possible relations between these two apparently very different con- cepts have therefore to be scrutinized. I thereby propose to undertake a comparison between the Scho- lastic and the Cartesian conceptions of conatus. I hope to show that certain traits of the former are indeed echoed by the latter, although adapted to the much changed physical paradigm of Cartesian physics. In fact, Descartes’s conatus, though sharing some important similarities with the old one, underwent significant transformations in terms of both its meaning and its application. However, I hope to show that these concepts are both used to describe the behaviour of bodies in relation to their intrinsic motive tendency, and in particular when this tendency is impeded or prevented. Such a reconstruction offers two main areas of interest. On an immediate level, it furthers the general efforts of scholars over the past decades to reconstruct the full extent of the relations between Descartes’s thought and Scholastic philosophy. However, there is another significant reason for taking an interest in the ties between the Scholastic and the Cartesian conceptions of conatus. Indeed, the Cartesian conatus must be seen as crucial to a proper understanding of the broader, diverse conceptualization that this idea enjoyed in the thought of many of the most important philosophers of the early modern period, namely Spinoza, Hobbes and Leibniz. In particular, Spinoza, were directly influenced by Descartes in their unique formulations of conatus. Thus a reconstruction of the context in which Descartes formulated his conatus and of its relations to a pre-existing Scholastic conception will enable us to better reconstruct the history of this idea in the early modern period. The paper is structured as follows: in the first part, I provide a thorough review of the Scho- lastic employment of the concept conatus – both its meaning and the extent of its usage. I then show that it occurs in some of the most prominent Cartesian sources. Finally, I shall provide an account of Descartes’s theory of circular motion and conatus with the specific aim of empha- sizing the elements of both continuity and discontinuity that justify the claim that Descartes’s con- ception of conatus is reminiscent of the Scholastic one.

This paper focuses on an understudied aspect of Hobbes's natural philosophy: his approach to the domain of life. I concentrate on the role assigned by Hobbes to the heart, which occupies a central role in both his account of human physiology and of the origin of animal locomotion. With this, I have three goals in mind. First, I aim to offer a cross-section of Hobbes's effort to provide a mechanistic picture of human life. Second, I aim to contextualize Hobbes's views in the seventeenth-century debates on human physiology and animal locomotion. In particular, I will compare Hobbes's views with the theories put forth by Harvey, Descartes, the Galenic, and Peripatetic traditions. Also, I will show that Hobbes was receptive to advances within contemporary English physiology and chemistry. Third, by means of a comparison with Descartes, I advance some hypothesis to explain why Hobbes indentified the heart, and not the brain (as was increasingly com...