Having made clear to ourselves the necessity of our first series of critical investigations, let us now make clear their insufficiency. We now require a criticism of analytic logic that can make us conscious of a number of idealizing presuppositions / with which logic operates as if they were truisms, not on the basis of a method that has become thematic, but again on the basis of a method used naïvely — presuppositions that we ourselves had consequently taken over without noticing them. This new criticism is a continuation of the one we practised at the first level, to clear up the division into three strata; and it therefore presupposes that criticism's investigations.