 The modal syllogistic on the other hand is little studied, according to Łukasiewicz, both because it falls well below the standards of perfection of the categorical, and for lack of a “universally acceptable system of modal logic”, which Łukasiewicz takes himself, with Ł, now to have provided. Łukasiewicz’s own treatment falls short of being definitive, though it provides material for later studies, and we shall not pursue it here. Interestingly, in Aristotle’s attempts in Book I, Chapter 15 of the Prior Analytics, to establish the theses