The remainder of this table is filed in Teachers College Library, Columbia University. TABLE 13 Nov., 1918 June, 1919 Nov., 1919 June, 1920 MEANS Arithmetic Ratio 89.02 97.16 ±1.05 ±1.07 Vocabulary Ratio 98.96 111.44 106.20 107.61 ±1.48 ±1.61 ±0.90 ±0.93 Reading Ratio 96.47 101.96 98.98 100.60 ±1.19 ±1.18 ±1.03 ±0.97 Completion Ratio 99.76 101.83 101.67 103.10 ±1.11 ±1.23 ±0.93 ±0.85 STANDARD DEVIATIONS Arithmetic Ratio 12.03 12.53 ±0.74 ±0.76 Vocabulary Ratio 15.71 16.58 10.34 10.84 ±1.05 ±1.14 ±0.64 ±0.66 Reading Ratio 12.63 12.14 11.82 11.36 ±0.84 ±0.84 ±0.73 ±0.69 Completion Ratio 12.34 12.63 10.85 9.90 ±0.82 ±0.87 ±0.67 ±0.60 CORRELATIONS OF RATIOS Arithmetic and Vocabulary .60 .30 ±.06 ±.08 Arithmetic and Reading .70 .64 ±.04 ±.05 Arithmetic and Completion .48 .61 ±.07 ±.05 Vocabulary and Reading .34 .32 .57 .47 ±.08 ±.09 ±.06 ±.07 Vocabulary and Completion .45 .36 .53 .54 ±.07 ±.08 ±.06 ±.06 Reading and Completion .61 .65 .67 .67 ±.06 ±.06 ±.05 ±.05