DURING THE PAST three years studies have placed considerable emphasis on curves of growth and especially on the growth of individual children. Richardson and Stokes (269), applying Thurstone's absolute scaling technic to test scores for children of from six to fourteen years of age, found a g curve which they extrapolated from birth to twenty-four years. This curve showed positive acceleration at first, with an inflection point around four years of age, and with negative acceleration becoming more marked at about thirteen; continued growth occurred to twenty-four. R. B. Cattell (116) has constructed a curve on his tests for the age range eight to fifteen years. McManama (219), using Spearman's method, found that means of test scores from nine to nineteen years increase regularly with age. Pintner and Stanton (258), testing 140 children repeatedly at yearly intervals in Grades I to VIII with the CAVD tests which have been scaled for absolute