 Still, while the Law of Significant Assertion cannot be true in its full generality, a restriction of the law to identity sentences is worth considering. Accordingly, in discussing Jones in relation to Frege and Russell, I will construe The Law of Significant Assertion as a doctrine concerning identity sentences—sentences of the form a is b (where a and b are names, demonstratives or descriptions and is functions accordingly as the is of identity, not predication)—and not as a claim about subject-predicate sentences generally.