 This is at best a promissory note about some future language of ‘physics’—the ‘true’ physics—and it incorporates a requirement of the causal closure of the physical domain that creates problems for certain aspects of Anomalous Monism (see the supplement on  Causal Closure of the Physical in the Argument for Anomalous Monism).  It is probably best to take a ‘physical’ description simply to be one that occurs in the language of a future science that is similar to what we call ‘physics’ today but with none of its inadequacies. One important component of such descriptions is their capacity to figure in strict laws of nature (see  3.1).  While this is non-negotiable for physical terms, it is an open question for mental terms, and Davidson will be arguing  (4)  for a negative answer.