 But (3) offers neither necessary nor sufficient conditions for physicalism. To see that it is not sufficient, consider the variety of dualism usually called property dualism. Property dualism says that (a) every particular is a physical particular but (b) some particulars (e.g. human beings) have psychological properties wholly distinct from any physical properties. The contrast here is with substance dualism. The substance dualist agrees with the property dualist that some particulars have psychological properties wholly distinct from any physical properties, but they will add that such particulars are themselves non-physical. 