 Suppose, per the discussion of at least §3 of the supplement, that linguistics were to succeed in delineating a class of analytic sentences grounded in the constraints of a special language faculty in the way that some Chomskyans sometimes seem to suggest. Would such sentences serve the purposes for which we noted earlier (§2) philosophers had enlisted them? Perhaps some of them would. An empirical grounding of the analytic might provide us with an understanding of what constitutes a person’s competence with specific words and concepts, particularly logical or mathematical ones. Given that Quinean scepticism about the analytic is a source of his scepticism about the determinacy of cognitive states (see §3.5 above), such a grounding may be crucial for a realistic psychology, determining the conditions under which someone has a thought with a specific content.