Whether one agrees with the theory of attempting to unify or generalize mathematics or not, whether one entertains an opinion that unification or generalization of mathematics is feasible or desirable even if possible, or one does not, out of this theory and attempt, together with the psychological studies developed contemporaneously, have come new and splendid developments in subject matter, and in the theory and in the technique of the teaching of mathematics. The efforts to unify mathematics have been in a large measure responsible for a general rationaizing and psychologizing of the branches of the subject, not alone the high school branches but the college branches as well. René Descartes, called “the father of modern algebra,” the inventor of analytic geometry, perhaps one should say, rather, the discoverer of the interrelations between geometry and algebra, more than three hundred years ago in his complete and unique coordination of these two branches of mathematics set in motion further attempts of the same sort. John Perry, of England, engineer and teacher of engineering students, about three decades ago, dissatisfied with the preparation of the youth of the English sclwols in mathematics, advocated among other plans for promoting interest, mastery and originality on the part of the students of mathematics that of correlating mathematics with other subjects, with the other sciences particularly, stressing application rather than theory. The most recent impetus in the direction of unifying or generalizing mathematics is the recognition, though no whole-hearted endorsement of the endeavor, made in the Report of the National Committee on the Reorganization of Mathematics in Secondary Education published in 1922.