sees all Kant’s errors contained in the following sentence from the _K. d. r. V._: “If I take away all thought” (through the categories), “from empirical knowledge, there remains absolutely no knowledge of an object, for through mere perceptions nothing at all is thought.” In endeavoring to construct a philosophy out of pure conceptions Kant failed to solve the problem, in having the thing-in-itself left on his hands. This proved to Schopenhauer that the path of abstract reflection was closed as the path of philosophy. Mr. Caldwell demurs to Schopenhauer’s statement that the “Æsthetic” is Kant’s only discovery, yet as the “Æsthetic” shows the tendency to conceptual abstraction, his view of Space and Time is of extreme importance. It is of the “Logic” of the _K. d. r. V._ that Schopenhauer’s criticism is materially and formally most radical. He gives a different account of the functions of the Soul, rejecting altogether the faculty-distinctions of Kant: he associates Kant’s faculty of Understanding more with Sense and the category of Cause with the spatio-temporal or perceptual construction of the world, and holds the other eleven categories to be mere blind windows put into a scheme through Kant’s love of symmetry; and, secondly, he holds Kant’s account of Reason to be utterly false, and substitutes his own doctrine of the thing-in-itself for Kant’s three Ideas of Reason. By Reason Schopenhauer means the power the mind has of forming general conceptions and of knowing by way of conception or idea, the matter for conceptions and ideas being of course derived from Perception. Reasoned knowledge is an abstraction from perceived knowledge, and all knowledge, as Schopenhauer says, is originally and in itself perceptive. The confusion in Kant’s account of the elements entering into knowledge, is Schopenhauer’s reason for holding that Kant can only have had the fundamental principle of his method imperfectly present to his mind. His whole difficulty in relating the elements of knowledge to each other arose from the fact that he in his thought likened the categories to conceptions through want of an explicit and persistent recognition of the nature of conception. Schopenhauer himself classifies the categories according to the planes or stages of experience they characterise: the perceptual, the mathematical, the logical, and the ethical in order. The categories are all abstractions, but not conceptions or notions. Conceptions are a particular kind of abstractions, and so are categories: to conceptions _material_ entities correspond, but to categories only relations or forms. Knowledge consists in the detection of relations existing between the different planes or sections of the perceptual continuum, the difference in perceived things being that some are immediately and others only mediately perceived. The true reason of Schopenhauer’s revolt from the method of conceptions is to be found in the difficulties in which he