One may note, without insisting on them too much, the defects of his treatment of the forms of thought. It may be said that, in the _first_ place, the table of the categories was incomplete. It had been borrowed, as Kant himself tells us, from the old logical subdivision of judgments, derived more or less directly from Aristotle and the Schoolmen. Now many of the relations occurring in ordinary thought could not be reduced to any of the twelve forms, without doing violence to them. But Kant expressly disclaims exhaustiveness in detail. He could, if he would: but that is for another season. In the _second_ place, the classification did not expressly put forward any principle or reason, and gave ground for no development. That there should be four fundamental categories, each with three divisions, making twelve in all, seems as inexplicable as that there should be four Athenian tribes in early times and twelve Phratriai. The twelve patriarchs of thought stand as if in equal authority, with little or no bearing upon one another. We have here, in short, what seems an artificial and not a natural classification of the types of thought. But Kant himself has given some explanation of the triad, and a sympathetic interpretation has shown how the four main groups are steps in the solution of one problem[3] In the _third_ place, the question as taken up seems largely psychological, or subjective, concerning the constitution of the human mind as a percipient and cognitive faculty. But this is necessary, perhaps, to the restricted nature of Kant's problem. He is dealing with the elements that form our objective or scientific consciousness of the physical world. The deeper question of the place and work of mind in life in general, in law and morality and religion, does not at this stage come before him. That problem in fact only gradually emerges with the Criticism of the Moral Faculty and the Aesthetic Judgment. Logic--as the doctrine of the _Logos_ which is the principle of all things, even of its own Other--had to wait for its preparation till it could be matured.