The Correspondence of School Achievement and Industrial Efficiency with Mental Age as Obtained by the Stanford-Binet

was undertaken in an attempt to determine the special abilities and disabilities of this group as shown on the Stanford-Binet. As a preliminary investigation, a case study was made of two boys of the same chronological age who, at the time of admission, had the same mental age and I.Q. One of these boys was doing all the school work of which we would judge him capable, while the other failed to equal his mental age in any subject. Leo, the more aggressive of the pair, is of average height and weight with an expression on his heavy set face which gives him the appearance of a potential trouble-maker. He walked and talked at the usual time, had measles, mumps and in fact was not considered peculiar by his family until he was of school age. Except for the fact that he is left-handed, the physical history contains nothing significant, but heredity and social reactions show a very different state of affairs. Leo's paternal grandmother is a patient in the Grafton State Hospital, his maternal grandfather was a chronic alcoholic, his father notoriously sexually promiscuous, and there