Dr. Fernald has applied 11 objective tests to a representative group of 100 inmates at the Massachusetts Reformatory (_15_) but the norms for the tests which he used were obtained, for the most part, by testing a dozen boys so that the line which he draws for the limit of the defectives is largely a matter of his expert opinion and the estimation loses objective character. He estimates that 26% of his group whose ages run from 15 to 35 inclusive were defective. Beanblossom[22] has published an account of tests on 2000 inmates of the Indiana Reformatory. Some of the Binet tests as well as other tests were used but the published results do not admit of reinterpretation. Comparing the reports from the Minnesota, Iowa, and New Jersey reformatories with the tested deficiency found in institutions for women delinquents on the basis of the same borderline with the scale, the records indicate clearly that the percentage of feeble-mindedness is greater in the reformatories for women. At the Bedford Reformatory for women, for example, Dr. Weidensall's results show that the corresponding borderline to that used in the New Jersey men's reformatory which reported 46% deficient, would class 100% at Bedford as feeble-minded, where only one case in 200 tested as high as XII. A conservative estimate of tested deficiency in men's reformatories from the above data would be from 15 to 20%. In the state institutions for minor delinquents, usually called industrial schools, we have several studies of representative groups with sufficient data to make objective interpretations comparable with our standard. In Ohio, Dr. Haines (_26_) reports on the examination of 671 delinquent boys 10 to 19 years of age at the Boys' Industrial School near Lancaster. Interpreted as we have indicated for the Ohio Institution for girls, we find 100, or 15%, in the group testing presumably deficient and 179 in the doubtful group, a total of 42% clear and questionable. In the corresponding Michigan Industrial School at Lansing, Dr. Crane (_37_) shows by his table of mental and life-ages that 52 out of the 801 unselected inmates, or 6% are presumably deficient and 171 below the presumably passable, or 21%. This is only a slightly greater number than our criterion would provide, if .8 of a year were not classed in the next higher mental age by these examiners. The age of those examined ran from 10 to 17. T. L. Kelley in his “Mental Aspects of Delinquency”[23] gives the results for an extensive series of measurements and tests on about three hundred boys in the Texas State Juvenile Training School. On the basis of an analysis of his tests he estimates that 20% of the boys there should be in a school for the feeble-minded. Interpreting his original data for the 1911 Binet tests on the same basis as our own, 8% fall within the clearly deficient group and 9% in the doubtful. The latter on account of their delinquencies might also be included as feeble-minded.