 If descriptions do not fix extensions, and some external factor fixes extensions, then by what process are extensions fixed? Kripke does not intend to propose a new theory of reference fixing, although the outlines of such a theory are fairly clearly implied by what he says. His principal aim is to make the case for the Millian denotation-without-connotation view of singular proper names, and then extend this (contrary to Mill’s own opinion) to certain general terms also, including natural kind terms.