_R. A. Boy, age 17; mental age 11; sixth grade; school work "nearly average"; teacher's estimate of intelligence "average."_ Test plainly shows this child to be a high-grade moron, or border-liner at best. Had attended school regularly 11 years and had made 6 grades. Teacher had compared child with his 12-year-old classmates. _H. A. Boy, age 14; mental age 9-6; low fourth grade; school work "inferior"; teacher's estimate of intelligence "average."_ The teacher blamed the inferior quality of school work to "bad home environment." As a matter of fact, the boy's father is feeble-minded and the normality of the mother is questionable. An older brother is in a reform school. We are perfectly safe in predicting that this boy will not complete the eighth grade even if he attends school till he is 21 years of age. _F. I. Boy, age 12-11; mental age 9-4; third grade; school work "average"; teacher's estimate of intelligence "average"; social environment "average"; health good and attendance regular._ Intelligence and school success are what we should expect of an average 9-year-old. _D. A. Boy, age 12; mental age 9-2; third grade; school work "inferior"; teacher's estimate of intelligence "average."_ Teacher imputes inferior school work to "absence from school and lack of interest in books"; we have yet to find a child with a mental age 25 per cent below chronological age who _was_ particularly interested in books or enthusiastic about school. _C. U. Girl, age 10; mental age 7-8; second grade; school work "average"; teacher's estimate of intelligence "average."_ Teacher blames adenoids and bad teeth for retardation. No doubt of child's mental deficiency. _P. I. Girl, age 8-10; mental age 6-7; has been in first grade 2½ years; school work "average"; teacher's estimate of intelligence "average."_ The mother and one brother of this girl are both feeble-minded. _H. O. Girl, age 7-10; mental age 5-2; first grade for 2 years; school work "inferior"; teacher's estimate of intelligence "average."_ The teacher nevertheless adds, "This child is not normal, but her ability to respond to drill shows that she has intelligence." It is of course true that even feeble-minded children of 5-year intelligence are able to profit a little from drill. Their weakness comes to light in their inability to perform higher types of mental activity.