But if one wants to broaden the concept of dualism as it is usually applied and take it in a transcendental sense, then neither it, nor the pneumatism that is opposed to it on the one side, nor the ma terialism on the other side, have the least ground, since then one's concepts would lack determination, and one would take the difference in the mode of representing objects, which are unknown to us as to what they are in themselves, for a difference in these things themselves.