The Apostle of “Common Sense”: The Historical Roots of Duhem’s Distinction between Physics and Metaphysics

Pierre Duhem’s 1905 essay “Physics of a Believer” is generally read as proposing a neat separation between metaphysics and physics as two fields that have little to nothing in common: some things will be the subject of metaphysics and some of physics, but nothing will fall under the purview of both. In this article, I advance a more nuanced interpretation of Duhem’s understanding of the differences between physics and metaphysics by drawing on his notion of “common sense” and highlighting the historical (particularly Aristotelian) influences at work in Duhem’s thought on this question. I argue that Duhem’s own distinction between physics and metaphysics is subtler than the received view, framing metaphysics and physics as two distinctive fields of inquiry that nonetheless both begin from sensed phenomena and common-sense principles that are eminently certain but characteristically imprecise.