ABSTRACT
Many philosophers would agree that any particular physical phenomenon which is explicable at all has some physical explanation. But not all who agree with this statement would willingly label themselves materialists. Yet, as I shall try to show, acceptance of this doctrine of physical explicability cannot sensibly be combined with rejection of a strong variety of materialism, namely what I call the Implication Thesis. This is to the effect that mental and psychological facts are strictly implied by the set of all actually true physical sentences. The tendency of my argument is thus to force a choice between acceptance of full-blooded materialism and rejection of the thesis of physical explicability.
