Full Idea
If P and Q are predicates denoting properties, we can construct a disjunctive predicate ('P or Q'). But it is not clear that this gives us any right whatever to suppose that 'P or Q' designates a property.
Gist of Idea
From the property predicates P and Q, we can get 'P or Q', but it doesn't have to designate another property
Source
John Heil (Philosophy of Mind [1998], Pref)
Book Reference
Heil,John: 'Philosophy of Mind' [Routledge 1998], p.-3
A Reaction
An important idea, needed to disentangle our ontology from our language, and realise that they are separate. Properties are natural; predicates are conventional.