This chapter provides a sample of the criticisms of philosophers on the course of linguistic philosophy. It expresses that concerning deductive reasoning and a priori propositions are claimed to be very valuable medicines for the cure of philosophical diseases. There is a certain analogy between the two things compared, and to emphasize it may be a useful medicine for certain philosophical diseases. One who was capable of forming visual images might quite well see the truth of any of these propositions without having to put them into words, and therefore their truth cannot possibly depend on the structure of language. On account of the linguistic theory of reasoning, one should naturally expect, would be to say that in all valid deductive reasoning the conclusion is part of the premises restated in different words, or that all a priori propositions are 'analytic', a view which as usually understood entails the truth of the former proposition about deductive reasoning.