Philosophical Inquiry

Volume 42, Issue 3/4, Summer/Fall 2018

Aristotle and the Thesis of Mereological Potentialism

According to Aristotle, the way in which the parts of a whole are is different from the way in which the whole exists. Parts of an object are only potentially, whereas the whole exists actually. Although commentators agree that Aristotle held this doctrine, little effort has been made to spell out precisely what it could mean to say that the parts are only potentially. In this paper, I shall attempt to elucidate that claim and explain the philosophical motivation behind it. I will argue that the motivation of mereological potentialism is to account for the unity of material substance. For a part to be potentially is, I will argue, a form of ontological dependence of the part on the whole. Potential parts have their being as a possible division of the whole. I will further explain this by specifying how the parts are grounded in the capacities of the whole and how the parts are individuated by the whole.