ABSTRACT

The notion of a category of substance, like the notion of knowledge, is both richly complex and unitary. As in the case of knowledge.!" a variety of principles can be advanced each of which reveals some aspect of what it is to be a substance. Such characterizations can seem disparate, and their very plurality commonly provokes the criticism that the word 'substance' is irremediably ambiguous. Yet reflection can reveal their interconnections, and the genuine unity of the list.