The Binet scale in its various forms provides only part of the objective evidence as to the mental inferiority of delinquents, although it affords the best means at present of interpreting the borderline of deficiency. Among the other investigations in which psychological tests have been tried with delinquents in comparison with normal subjects, the recent study of the Mentality of the Criminal Women by Weidensall is the most important so far as estimating the frequency of deficiency is concerned (_60_). It affords an admirable check upon our conclusions from the Binet examinations, since she gives in detail the results with a random group of 88 women inmates of the Bedford (N. Y.) Reformatory, which is quite comparable with the group of 200 which she tested with the Binet scale, and which we have already considered. For our purpose, the most important comparisons are those between the group of women in the reformatory and the group of 15-year-old Cincinnati working girls tested by Woolley with the same tests. Weidensall's Table 92 shows for three tests the percentages of the Bedford women who tested below the lowest 1% of these girls. For the opposites test, 20% were below this borderline; for a test on the completion of sentences, 12%; for the memory span for digits, 29%. She also shows that 17% of the delinquent group were poorer than any of the working girls and 30.7% as poor as the poorest 5.7% of these working girls, when their mentality is measured by the number of the tests in which their ability is at or above that of the median working girl of fifteen. This 30.7% is probably most nearly comparable in ability with the lowest 0.5% of the general population. Kelley's monograph on Mental Aspects of Delinquency, to which reference was made in the last chapter, gives the results with boys in the Texas Juvenile Training School for the completion test and his own construction test, as well as for a number of physical measurements, sensory and motor tests. He has used various data from which to provide norms for comparison. In connection with the Psychopathic Institute at the Chicago Juvenile Court, Healy and Fernald (_125_) have published an elaborate series of tests with suggestions as to how they may be employed for analyzing a child's mental ability and estimating his mental capacity. Schmidt has partially standardized these tests (_178_). Guy G. Fernald (_15_) tried out a dozen different tests and recommends seven of them for testing delinquents who are of adolescent age or older. Haines has sought the diagnostic value with girl delinquents of a dozen tests including Fernald's test of moral judgment. Weidensall (_218_), Smedley (_51_), Rowland (_49_), Porteus (_45_), and Whipple and Fraser (_220_, p. 663), have published results with certain tests tried with delinquents. With none of these tests can we adequately define the borderline of feeble-minded intellects.