Q stands for Quotient, which will mean a Subject Age divided by a Chronological Age. R stands for Ratio, which will mean a Subject Age divided by a Mental Age. AQ means Woody-McCall Arithmetic Age divided by Chronological Age, and AR means this AA divided by Mental Age. VQ means Thorndike Vocabulary Age divided by Chronological Age, and VR means this VA divided by Mental Age. RQ means Alpha 2 Reading Age divided by Chronological Age, and RR means this RA divided by Mental Age. CQ means Kelley-Trabue Completion Age divided by Chronological Age, and CR means this CA divided by Mental Age. SQ means any Subject Quotient, that is, any Subject Age divided by Chronological Age, and SR means any Subject Ratio, that is, any SA divided by Mental Age. EQ means the average of all Subject Quotients and AccR, the Accomplishment Ratio, means the average of all Subject Ratios. All _r_’s are product-moment correlation coefficients, uncorrected. As the reliabilities (Table 4) are almost what the other coefficients are in June, 1920 (Table 5), it is apparent that the corrected coefficients, when Grade III is excluded, would all be very near unity at that time. THE QUOTIENTS In Table 1 are presented all the quotients for all periods of testing, grouped by children. The table, a sample of which is included here,[9] shows clearly how all SQ’s approach IQ as special treatment continues. The grades indicated in this grouping are as of June, 1920. Inasmuch as many double and triple promotions were made in an effort to get maximum product for intelligence invested, no conclusion can here be formed of the grade to which these children belonged at any time except June, 1920. The correspondence between IQ and the SQ’s in June, 1920 is further shown in Table 2. In this table the 48 children who took all tests at all periods are ranked from high to low IQ and their SQ’s are listed opposite. The high correspondence is readily apparent. TABLE 1[10] INTELLIGENCE QUOTIENTS FOR ALL PERIODS GROUPED BY CHILDREN The children are arranged by grade as they were in June, 1920, and alphabetically within the grade. The periods of testing are lettered in their chronological sequence; _a_ is November, 1918, _b_ is June, 1919, _c_ is November, 1919 and _d_ is June, 1920. * = Zero Score GRADE 3