Intellectual deficiency, 10, 17, 20 Intelligence quotient, 304, 313 Juvenile delinquency and deficiency, 220-223 Juvenile delinquents, 162 Kuhlmann's Scale, borderlines, 87-90, 111, 118 Legal responsibility, 244 Maturity of mind, 83, 282, 290 Later for deficients, 294 ff., 230 Measurement units, 254 ff., 275 ff., 317 Mental deficiency, 11, 20 See feeble. Mental development, 279 ff Minneapolis: delinquents tested, 125 School retardation, 177-185, 199 Juvenile deficient delinquents, 220-223 Minneapolis, school group tested, 85-91 Morons: chances of delinquency, 217 Danger to society, 237, 246 Normal distribution, 256, 267 Observation home, 242 Offenses, 168 Percentage definition of deficiency, 5, 13, 20, 65, 75, 80, 240, 304 ff., 307 Advantages, 311 ff. Percentage feeble-minded, 47 ff. Percentiles as units, 276 Point Scale, borderlines, 114, 313 Prostitutes, 78, 129, 140, 158 Schooling, 186 Quantitative definitions, 21, 304 ff. Effect of uncertain forms of distribution, 317 ff. Ranks as units, 276 Rates of development, 290 ff. Recidivism, 168, 235 Reformatories, 128, 143 Responsibility of deficients, 244 School test of deficiency, 177, 189 ff. School maladjustment, 203-209, 247 School retardation of delinquents, 177-188, 190-194, 199 Skewed distributions, 267, 300 Social care, 47-52, 80, 158 ff., 212-214, 216, 237, 242-251 Social deficiency, 10, 15, 74, 239 Special ability, 34, 45 Special classes, 62 ff., 74-80 Standard deviation, 256, 306, 314 Stanford Scale, borderlines, 101, 112, 313 State prisons, 128, 141 State Training Schools, 131, 145 Sterilization, 245 Test by school retardation, 177, 189 Tested deficiency, 13 Tests, mental, 170 ff. See also Binet, Goddard, Kuhlmann, Point, and Stanford Scales. Thorn Hill Detention Home, 151 Training for deficients, 205 Units of measurement, 254, 275, 317 Vagrancy, 158 Variability, 41-46, 280 ff. Year units, 260-266 * * * * * * Transcriber's note: 1. Changed the total column in Table X on p. 151 for the life-age 8 row to 1 and the Totals row to 124. 2. In TABLE XIII. on p. 179 the GIRLS Percentages columns on the Ordinary Pupils row only adds up to 99%. 3. Silently corrected typographical errors. 4. Retained anachronistic and non-standard spellings as printed.