Abstract

In this paper, I compare Margaret Cavendish’s argument for the view that colours of objects are inseparable from their ‘physical’ qualities with George Berkeley’s argument for the view that secondary qualities of objects are inseparable from their primary qualities. By reconstructing their respective arguments, I show that both thinkers rely on the ‘inconceivability principle’: the claim that inconceivability entails impossibility. That is, both premise their arguments on the claim that it is impossible to conceive of an object that has size and shape but no colour. I argue that Cavendish, like Berkeley, accepts the inconceivability principle on the grounds that it is impossible to conceive of something that could not, in principle, be perceived and, in turn, that something imperceptible could not possibly exist. As such, I argue that both Cavendish and Berkeley are committed to an ‘empiricist’ modal epistemology: one wherein our knowledge of what it is possible to perceive informs us about what could possibly exist. For this reason, I conclude that there is more empiricism in Cavendish’s epistemology than secondary literature to date suggests.