Physicalism is one contemporary form of naturalism in analytic philosophy and English speaking philosophy of science. Here it is treated mainly as an ontological thesis: the world is what the natural sciences say it is and if there is anything else, it does not interact with objects, events, processes within our world. The coherence principle (CP) sets out the relation between ontology and inquiry, with its epistemology - in a slogan: epistemology must justify ontology, ontology must explain epistemology. These are, respectively, the epistemic and ontological requirements of the principle. (Chapter 1.) This principle is applied to physicalism as an ontology and it is argued there is good reason to think it cannot meet the ontological requ...