This paper examines Hobbes’s criticisms of Robert Boyle’s air-pump experiments in light of Hobbes’s account in _De Corpore_ and _De Homine_ of the relationship of natural philosophy to geometry. I argue that Hobbes’s criticisms rely upon his understanding of what counts as “true physics.” Instead of seeing Hobbes as defending natural philosophy as “a causal enterprise … [that] as such, secured total and irrevocable assent,” 1 I argue that, in his disagreement with Boyle, Hobbes relied upon his understanding of natural (...) philosophy as a mixed mathematical science. In a mixed mathematical science one can mix facts from experience with causal principles borrowed from geometry. Hobbes’s harsh criticisms of Boyle’s philosophy, especially in the _Dialogus Physicus, sive De natura aeris_, should thus be understood as Hobbes advancing his view of the proper relationship of natural philosophy to geometry in terms of mixing principles from geometry with facts from experience. Understood in this light, Hobbes need not be taken to reject or diminish the importance of experiment/experience; nor should Hobbes’s criticisms in _Dialogus Physicus_ be understood as rejecting experimenting as ignoble and not befitting a philosopher. Instead, Hobbes’s viewpoint is that experiment/experience must be understood within its proper place – it establishes the ‘that’ for a mixed mathematical science explanation. (shrink)

In the introduction to the Leviathan, Hobbes famously defends the anthropological point of departure of his theory of the state by invoking the Delphic injunction ‘Know thyself!’ of which he presents a peculiar reading thereafter. In this paper, I present a reading of the anthropology of the Leviathan that takes this move seriously. In appealing to Delphic injunction, Hobbes wanted to prompt a particular way of reading his anthropology for which it is crucial that the reader relate the presented anthropological (...) views to his self-conception. The anthropology of the Leviathan is thus a kind of manual for a certain kind of self-reflection by which the reader's self-knowledge is to be improved. Furthermore, I will argue that Hobbes' interpretation of the Delphic injunction illuminates several theoretical issues relevant to the epistemology of that kind of ‘self-knowledge’ that was demanded by the Delphic injunction. While Hobbes does not solve all the epistemological problems related with the ideal appealed to by this inscription, he does provide some interesting insights into some general requirements that any epistemological account of Socratic self-knowledge has to meet. (shrink)