This conception overturns the foundations of philosophy. Since the human mind is seen now to be a part of nature and interacts with the rest of the world according to laws which are more or less known, it is classed among Kant's phenomena. There is no longer any need of talking about noumena. Thus they do not longer exist for us. Philosophy then reduces itself to the theory of experience, to the science of the human mind. It is at this point that the beginning made by Kant had to be farther developed. Kant had always separated mind and nature very sharply. But the understanding that this separation should only be made temporarily for the purpose of better investigation, and that there is no absolute difference between matter and mind made it possible to advance the science of thought processes. However, this could be accomplished only by a thinker who had fully digested the teachings of socialism. This problem was solved by Joseph Dietzgen in his work on "THE NATURE OF HUMAN BRAIN WORK," the first edition of which appeared in 1869, and by this work he won for himself the name of philosopher of the proletariat. This problem could be solved only by the help of the dialectic method. Therefore, the idealist philosophical systems from Kant to Hegel which consist chiefly in the development of the dialectic method, must be regarded as the indispensable pioneers and precursors of Dietzgen's proletarian philosophy. ************ The philosophy of Kant necessarily broke down on account of its dualism. It had shown that there is safety only in finite and material experience, and that the mind becomes involved in contradictions whenever it ventures beyond that line. The mind's reason calls for absolute truth which cannot be gotten. Hence the mind is groping in the dark and critique may perhaps explain why it is in the dark, but it cannot show the way out. What is called with Kant dialectics is in reality resignation. True, the mind finds knowledge about things outside of experience by some other way, viz., by means of its moral consciousness, but this intuitive knowledge in the form of faith remains sharply separated from scientific understanding. It was the task of the philosophical development immediately after Kant, to do away with this sharp separation, this unreconciled contradiction. This development ended with Hegel; its result was the understanding that contradiction is the true nature of everything. But this contradiction cannot be left to stand undisturbed, it must be solved and still retained in a higher form, and thus be reconciled. Therefore the world of phenomena cannot be understood as being at rest. It can be understood only as a thing in motion, as activity, as a continuous change. Action is always the reconciliation of contradiction in some higher form, and contradiction appears in this way as the lever of progressive development. That which accomplishes this dialectic self-development does not appear in the