As scientific psychology improves the methods of testing for individual differences in children, it will become possible to educate each one according to his capacity for learning. It will be possible to conserve and develop the special aptitudes of every child, regardless of race, sex, or circumstance. The humiliation and despair of chronic failure at prescribed tasks unsuited to capacity may be spared every child. Thus we come again to consider tests of innate educability in _The Republic_: “We must watch them from their youth upwards, and make them perform actions in which they are most likely to forget or to be deceived, and he who remembers and is not deceived is to be selected.” That will be the way. REFERENCES CAMERON, E. H.—_Psychology and the School_; The Century Co., New York, 1921. CLARK, E.—“The Growth of Cities and Their Indebtedness for Schools”; _Elementary School Journal_, 1918. ELLIOTT, C. H.—_Variations in Achievements of Pupils_; Teachers College, Columbia University, 1915. FRANZEN, R.—_The Accomplishment Ratio_; Teachers College, Columbia University, 1922. JUDD, C. H.—“Analysis of Learning Processes and Specific Teaching”; _Elementary School Journal_, 1921. MAYBERRY, L. W.—“Individualizing Problems for Pupils”; _Elementary School Journal_, 1917. RUGG, H. O.—“School Costs and Business Management”; _Elementary School Journal_, 1917. SPAULDING. F. E.—“A Million a Year”; _Monograph No. 1_, Board of Education, Minneapolis, 1916–17. SPAULDING, F. E.—“Financing the Minneapolis Schools”; _Monograph No. 2_; Board of Education, Minneapolis, 1916–17. TERMAN, L. M.—_The Intelligence of School Children_; Houghton Mifflin Co., 1919. THORNDIKE, E. L.—“Education for Initiative and Originality”; _Teachers College Record_, 1916. WASHBURN, C.—“The Individual System in Winnetka”; _Elementary School Journal_, 1920. WOOLLEY, H. T.—_Feeble-minded Ex-School Children_; Helen S. Trounstine Foundation, Cincinnati, 1921. ZIRBES, L.—“Diagnostic Measurement as a Basis for Procedure”; _Elementary School Journal_, 1918. INDEX Ability, definition of, 4. Absolute pitch, 171. Agnew, M., 181. Agraphia, 51. Aikens, H. A., 48. Alexia, 51; “congenital,” 63. Alcoholic psychosis, 20. Ambidexterity, 185. Anderson, C. I., 96, 121, 139. Aphasia, 51. Aphemia, 51. Arithmetic, capacity for, 114; defined, 115; special defect in, 119 f. Arithmetical abilities, organization of, 117 f.; of children over 180 IQ, 131 f.; inheritance of, 137 f. Arithmetical prodigies, 122 ff. _See also_ Lightning calculators. Attendance, effects of irregular, 68, 120. Ayer, F. C., 143, 144, 147, 148, 149, 150, 163. Ayres’ scale, 12, 105. Baerwald, R., 11, 46. Baldwin, J. M., 188. Beeley, A. L., 186, 189, 195. Berkau, O., 96. Berkowitz, I. H., 96.