Abstract: | This paper argues for including stuff in one's ontology. The distinction between things and stuff is first clarified, and then three different ontologies of the physical universe are spelled out: a pure thing ontology, a pure stuff ontology, and a mixed ontology of both things and stuff. (The paper defends the latter.) Eleven different reasons for including stuff (in addition to things) in one's ontology are given (seven of which the author endorses and four of which would be sensible reasons for philosophers with certain metaphysical positions that the author does not happen to hold). Then five objections to positing stuff are considered and rejected. |