ABSTRACTJacques Rohault is often considered to be one of the most meticulous followers of Descartes. Despite this, Rohault’s natural philosophy lacks much of the metaphysical bulwark that typifies Cartesian treatises of the seventeenth century. Instead, Rohault’s work, as well as his popular weekly meetings, strongly emphasized rigorous observation and experimentation. Traditionally, this emphasis on experiment over metaphysics is seen as a pragmatic omission to avoid the perils associated with censorship and Cartesian metaphysics. However, I find that the lack of explicit (...) metaphysics has real consequences that play out in the role Rohault assigns to experimentation. To show this, I highlight several areas where he adopts a broad experimental methodology even though Descartes explicitly rejects the relevancy of experiment on metaphysical topics. I place special emphasis Rohault’s extensive experiment on the void. In short, Rohault’s experimentation was designed to prove, through experimental mea... (shrink)

Descartes’s arguments about the certainty of mathematics in the Rules for the Direction of the Mind cannot be understood independently of his attack on the authority of ancient authors. The author maintains this view by reading Descartes’s claims about mathematics through the lens of status theory, a framework for disputation revived by Renaissance dialecticians. Within status theory, “certainty” was closely associated with consensus. The essay shows how Descartes used status to attack the authority of the ancient authors and elevate mathematics (...) as an alternative. Descartes’s arguments about the certainty of mathematics are colored by his effort to make mathematics satisfy the demands of status-based disputation. Specifically, in order to elevate the status of mathematics, Descartes portrayed it as more common—prone to consensus—than he really believed it was. (shrink)