Usually, the attempt is made to define it in terms of mathematics: either by trying to bring it as near to mathematics as possible, by drawing up an inventory of everything in the sciences of man that is mathematicizable, and supposing that everything that is not susceptible of such a formalization has, not yet attained to scientific positivity; or, on the contrary, by trying to distinguish very carefully between thedomain of the mathematicizable and that otherdomain which is regarded as irreducible to the former because it is the locus of interpretation, because the methods applied to it are above all those of comprehension, because it finds itself wound around the clinical pole of knowledge.