Imperatives purely a priori. Secondly, taken in connection with the false explanation of Theoretical Reason, as given in the Kritik der Reinen Vernunft, it is presented as a certain faculty essentially concerned with the Unconditioned, as manifested in three alleged Ideas (the impossibility of which the intellect at the same time recognises a priori). And we found that this position, as an exemplar vitiis imitabile, led our muddy-headed philosophers, Jacobi at their head, from bad to worse. They talked of Reason (Vernunft) as directly comprehending (vernehmend) the “Supersensuous,” and absurdly declared that it is a certain mental property which has to do essentially with things transcending all experience, i.e., with metaphysics; and that it perceives directly and intuitively the ultimate causes of all things, and of all