Abstract

My aim in this chapter is to present the fundamentals of Epicurus’ views on physics and ontology and to raise some questions that a competitor to Aristotelian hylomorphism ought to be able to handle. In section 1, I present the basic ontological framework; in section 2, I introduce atoms, which most closely correspond in Epicurus’ system to Aristotelian matter, and show how he attempted to account for some phenomenal and psychological properties of compound bodies by appealing just to the characteristics and arrangement of their atomic parts. But it turns out that not all macroscopic properties are regarded as explicable in this way. In section 3, I introduce an alternative Epicurean analysis of bodies that treats them not as aggregates of material parts but rather as complexes of attributes that have so-called ‘permanent natures’ at their core. I argue that this analysis must play an ineliminable explanatory role in some contexts, in order to account for the unity of compound bodies, their persistence over time, and to ground modal claims about what belongs to them necessarily or non-necessarily. In section 4, I briefly discuss a semi-technical formulation that some Epicurean philosophers use when making such claims.