The views of Quine and Strawson on the significance of 'mass terms' are rehearsed, and the metaphysical status of substances, in the chemist's sense, is considered. It is urged that the ontological dichotomy of particulars and universals is not adequate to accommodate such substances, which are in a sense to be explicated concrete but non-particular.

In this paper I will combat the claim that concrete matter can exist independently of objecthood. This view is a denial of the Aristotelian principles that only particular objects exist apart, and that as a condition of concreteness, matter must have acquired form. For, it propounds that matter can be concrete and general.