The Stenquist, Thorndike, and Trabue study of children 9 to 16 years of age, who were county charges as delinquents or dependents in a single county, provides results for a group of 104 delinquent boys. Translating their records as I have explained for the girls in the group, we find 11 of these presumably deficient and 18 doubtful, a total of 28%. So far as their delinquency is concerned these probably correspond to the local institution groups. While there is little difference in the average mentality of the groups of delinquent and dependent children in this county shown by tests there is apparently some difference in the frequency of serious deficiency. In their corresponding group of 63 dependent boys who were county charges, 2 are in the presumably deficient group and 10 in the doubtful, a total of 19%. Miss Merrill found only 0.8% in our presumably deficient group and 1.6% uncertain in a group of 250 dependent children at the Minnesota State home (_149_). Dr. Pintner reports the examination of 100 cases in the Columbus, Ohio, Juvenile Court who were in the detention home waiting to be disposed of or held for trial.[25] He does not say whether they were selected cases among those in the home, but we may presume that they were more serious offenders than the usual juvenile court cases not in the home. Their ages ranged from 7 to 20 years. He used the Binet 1911 series and allowed double credit for any test passed in the XV or adult series. By placing his borderline so that a person testing 3.1 years retarded if he scored under XII would be regarded as feeble-minded, Dr. Pintner found 46% feeble-minded in this group. Under the same standard about 20% of the Minneapolis group would be classed as feeble-minded, instead of 2 to 7% under our more conservative borderlines. In a preliminary report of the doctorate examination of Dr. Olga L. Bridgman (_132_) I find that she reports testing 205 delinquents and 133 dependent children sent to the psychological clinic of the University of California. She found 36% of the delinquent and 26% of the dependent cases thus especially selected for clinical examination to be “definitely feeble-minded,” but the preliminary report does not enable one to judge the standard used for her borderline (_3_). Ordahl's study[26] of 61 cases who were wards of the San Jose Juvenile Court is not comparable with other groups since both sexes, both dependents and delinquents and ages from 3 to 44 were included. Dr. Hickson (_8_) reports concerning some 2700 cases selected especially for examination from those passing through the municipal court in Chicago, in the divisions of the Boys Court, the Morals Court and the Domestic Relations Court. His tables state only average mental ages, and he classes 728 boys who average XI.11 as morons, so that I am unable to make any comparisons with his data.