In recent years, the debate concerning the ontology of mind and body has been structured around an opposition between monistic, physicalist ontologies (both reductive and non-reductive) and some form of dualism (both of property types and of kinds of substance). This, however, has not always been the case. In the early twentieth century, a monistic, but non-physicalist, ontology

Neutral monism was also considered a serious contender, favoured especially by theorists working within what James characterises as the radical empiricist tradition. This paper outlines a new version of this third species of position in the mind-body debate. Unlike its predecessors, however, this version of neutral monism is motivated not by primarily epistemological considerations, but on the basis of recent developments on the ontology of properties. It is argued that, if one adopts the \.