_R. H. Boy, age 14; mental age 8-4; I Q 65._ Father Irish, mother Spanish. Family comfortable and home care average. Has attended school eight years and is unable to do fourth-grade work satisfactorily. Health excellent and attendance regular. Reads in fourth reader without expression and with little comprehension of what is read. Fair skill in number combinations. Writing and drawing very poor. Cannot use a ruler. Has no conception of an inch. R. H. is described as high-tempered, irritable, lacking in physical activity, clumsy, and unsteady. Plays little. Just "stands around." Indifferent to praise or blame, has little sense of duty, plays underhand tricks. Is slow, absent-minded, easily confused, in thought, never shows appreciation or interest. So apathetic that he does not hear commands. Voice droning. Speech poor in colloquial expressions. Three years later, at age of 17, was in a special class attempting sixth-grade work. Reported as doing "absolutely nothing" in that grade. Still sullen, indifferent, and slow in grasping directions, and lacking in play interests. "No apperception of anything, but has mastered such mechanical things as reading (calling the words) and the fundamentals in arithmetic." In school work, moral traits, and out-of-school behavior R. H. shows himself to be a typical case of moron deficiency. _I. M. Girl, age 14-2; mental age 9; I Q approximately 65._ Father a laborer. Does unsatisfactory work in fourth grade. Plays with little girls. A menace to the morals of the school because of her sex interests and lack of self-restraint. Rather good-looking if one does not hunt for appearances of intelligence. Mental reactions intolerably slow. Will develop but little further and will always pass as feeble-minded in any but the very lowest social environment. [Illustration: FIG. 6. BALL AND FIELD TEST. I. M., AGE 14-2; MENTAL AGE 9] _G. V. Boy, age 10; mental age 6-4; I Q 65._ Father Spanish, mother English. Family poor but fairly respectable. Brothers and sisters all retarded. In high first grade. Work all very poor except writing, drawing, and hand work, in all of which he excels. Is quiet and inactive, lacks self-confidence, and plays little. Mentally slow, inert, "thick," and inattentive. Health fair. Three years later G. V. was in the low third grade and still doing extremely poor work in everything except manual training, drawing, and writing. Is not likely ever to go beyond the fourth or fifth grade however long he remains in school.