Psychologism, its arguments and its attitude to the usual counter-arguments

If we now apply the general results arrived at in the last chapter to logic as a normative discipline, a first, very weighty question arises: Which theoretical sciences provide the essential foundations of the theory of science? And to this we forthwith add the further question: Is it correct that the theoretical truths we find dealt with in the framework of traditional and modern logic, and above all those belonging to its essential foundations, have their theoretical place in the sciences that have been already marked off and independently developed?