hen if only it can be shown that mathematical rela- tions are themselves alogical construction of thought, the knowing mind is enstated as the constitutive author of the whole scheme. Realistic theories have protested against doc- trines that make the knowing mind the source of the thing known. But they have held to adoctrine of apartial equation of the real and the known jonly they have read the equation from the side of the object instead of the subject. Knowledge must be the grasp or vision of the real as it "is in itself," while emotions and affections deal with it as it is affected with an alien element supplied by the feeling and desiring subject. The postulate of the unique and exclusive relation among experi- enced things of knowledge and the real is shared by epistemo- logical idealist and realist.