Hume's Natural Philosophy and Philosophy of Physical Science by Matias Slavov (review)

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• Hume’s Natural Philosophy and Philosophy of Physical Science by Matias Slavov
• Krisztián Pete

Matias Slavov. Hume’s Natural Philosophy and Philosophy of Physical Science. London: Bloomsbury Academic, 2020. Pp. 216. Hardcover. ISBN 9781350087866, £95.

Although the relationship between Hume and Newton is a recurring theme in the Hume literature, Matias Slavov’s book does not seek to contribute to the debate between the traditional (Hume imitated Newton’s natural philosophy) and the critical (Hume intended his “science of Man” as the foundation of all other sciences) approaches regarding the nature of this relation. The book is intended to be a summary of Hume’s natural philosophy—or rather an aggregation of his comments on natural philosophical topics—pursued by exploring and analysing themes and issues that were prominent in the natural philosophy of the early modern period. In this respect it is a pioneering undertaking.

Of course, Slavov does not claim in his book that Hume is a natural philosopher. “[F]irst and foremost . . . [h]e is not; for his main objective is to establish a new science of human nature” (1). But Slavov does claim that Hume’s natural philosophical views can be understood and valued in themselves and in the philosophical-scientific context of his time as well. The book is not a discussion of the natural philosophical dimensions of the “science of human nature,” but rather, of the natural philosophical views which are reconcilable with his main objective. In this respect, the book is not a methodological approach to Hume’s supposed natural philosophy, but a synthesis of certain elements of Hume’s philosophy that can feature in a consistent natural philosophy. Although his arguments are generally indirect and are more about what Hume seems to be committed to and what follows from his epistemological position rather than his actual positions, Slavov’s conclusions seem mostly convincing.

Thus, Slavov’s point is not that the empiricist method is compatible in every detail with Newtonian mechanics, but rather that Hume seems to be committed more to a Cartesian natural philosophy. Slavov does not write about the possibility and significance of applying natural philosophical methods to moral philosophy; rather, he wants to build a complete philosophy of nature around some of Hume’s basic ideas to “fill the gap for a book on Hume’s relation to natural philosophy and philosophy of physical science” (2).

The book has two “equally important aims” (ix): to shed more light onto Hume’s relationship to natural philosophy, and to demonstrate that physics and philosophy have overlapping domains. Hume was hardly concerned with physics, so Slavov’s strategy of defining natural philosophy as an overlap between physics and philosophy (chapter 1) does, to some extent, explain the lack of textual evidence in this area. The definition of natural philosophy chosen by Slavov is also intended to ensure [End Page 170] that these two goals are intertwined, since according to Slavov’s definition, natural philosophy is “a grey area between philosophy and physics” (12).

Personally, I do not feel comfortable with this definition because it is not informative enough; it says that natural philosophy is more than modern physics (mathematized natural science), but it is not quite philosophy. While the first implication is very agreeable, and a number of scholars have addressed the issue, to assess the second implication, we would need to know exactly what philosophy is in this context. Perhaps the best candidate is metaphysics, even if Slavov keeps the reader somewhat in the dark on this point, despite the fact that chapter 2 is intended to establish precisely that point. Yet, the metaphysics of this period was usually (with the possible exception of Spinoza) used to support natural scientific explanations. I believe that natural philosophy is more than a “grey area” (9, 12, 22), or a contact zone; it is a complex enterprise that evolved in different forms with different emphases: Cartesian mechanics still sought to understand nature, pursuing the Aristotelian ideal of knowledge, albeit rejecting Aristotelian methods, while empiricists increasingly envisaged a more instrumentalist role for natural explanations. Newton himself was caught between the two.

In this context it is intriguing whether Hume carries forward Berkeley...