  Schlick presented his latest conception of grammar as well as its application to philosophical pseudo-problems in his 1936 essay on “Meaning and Verification” (Schlick 1979b, 456–481). In particular, he demonstrated that the criterion of verifiability is rooted in grammar and concerns any grammatically well-formed proposition which is neither analytic nor contradictory. He reiterated his conception of grammar as the collection of rules governing the formation and use of meaningful expressions, including the rules governing the use of language in connection with experience, rules which are introduced by acts of ostension (Schlick 1979b, 464–7). Although the result is an analysis of language which provides a powerful treatment of many ‘typical’ metaphysical theses, like Platonism, psychologism, and phenomenalism, in “Meaning and Verification” Schlick demonstrated its utility by applying it to solipsism. The upshot is that solipsism is a contingent truth which is treated by its defenders as unfalsifiable. But statements which are insulated from the possibility of falsification are object-language ‘mis-expressions’ of what are, at bottom, grammatical rules. The parallel with Carnap’s analysis of pseudo-object sentences as metalinguistic assertions rather than ‘real-object’ sentences could not be more striking. And just as Carnap regarded the formal mode translations of philosophical theses as proposals to adopt a certain language form, Schlick contended that the solipsist’s thesis was not a bona fide contingent claim but simply an attempt to introduce a particular mode of speech. Thus, by the time of “Meaning and Verification”, he had moved well beyond his ‘Form and Content’ stage, modulating the virulent Positivism of his earlier thinking, to arrive at a more mature and balanced conception of the issues at the focus of his philosophical concerns (Oberdan 1996, Sec. 5).