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The I. Q. is claimed by a large number of educators, psychologists, psychiatrists, sociologists and social workers to be the measurement of intelligence par excellence. On the other hand, there is a large group of psychologists who hold mental reservations regarding the validity of mental tests as a present constructed and administered. Thomas says, "Mental capacity and growth can be measured only indirectly, and the meaning of the results obtained becomes a matter of great controversy. There is no general agreement as to the nature of intelligence and there is no scientific way of checking whether the empirically determined tests measure what their sponsors claim."2 Nevertheless, mental testing is the only method of measuring intelligence yet devised and its use seems inevitable until more accurate techniques are evolved for the measurement of intellectual abilities and capacities. With this consideration in mind as to the general nature of mental tests, the I. Qs. of 492 delinquent boys committed to the Wisconsin Industrial School may be examined to see what relation exists, if any, between delinquency, mental abnormality and mental defect. This investigation may be facilitated by a comparison with other groups of juvenile delinquents, children of dependent families and normal children.

The Intelligence of Delinquent Boys Committed to Wisconsin Industrial School