 The best known version of Russellian neutral monism is panprotopsychism—a view that David Chalmers has explored over many years (Chalmers 1996, 2015). In the standard form of this theory the postulated intrinsic properties are characterized as being neither experiential (they are proto-psychic) nor physical (they lack the structural/dispositional nature of physical properties). That makes them neutral (in the Neither Sense). But this purely negative characterization of the intrinsic properties has occasioned considerable discomfort. A variant of this theory—panqualityism—addresses this problem in a most satisfactory manner, while creating new problems of its own.