_Immediate family_. B is the sixth born of seven siblings. Of these children, two--the brother born two years before B and the brother born five years after B--have had mental tests. The older brother was measured in the course of the mental survey made by Dr. Malherbe. His IQ (S-B) at the age of 10 years 6 months was 167. This is not a full measure of his brother, as he passed many tests at the highest levels of performance provided by the scale. A still older brother passed the entrance examinations for the Columbia College, from which may be inferred intelligence above the average. The younger brother's IQ (S-B) at the age of 6 years 10 months was 138. PRESCHOOL HISTORY The preschool history of B has been elicited from the parents. She cut her first tooth at 7 months. She began to talk at 9 months of age and to walk at 15 months. As soon as she was able to walk out with her nurse or her mother, at about the age of 24 months, B began to notice the letters on billboards and to spell out words. By the time she was in the third year of life she could read fluently in simple books. (The brother whose IQ is referred to above as 167 did not read until he was about 4 years 6 months of age.) SCHOOL HISTORY B has always attended private schools. She began her school life in kindergarten, at the age of 3 years, and attended the same school until the age of nearly 9 years. At the age of 8 years 4 months she had reached only the fourth grade, whereas in the battery of educational tests given as a part of the school survey she passed at that age the seventh-grade standards for public schools. In appraising the great discrepancy between school progress and ability in this case, it is necessary to bear in mind that children in some private schools are highly selected as regards intellect. The median IQ in this particular school was shown by the survey to be much above 100; so that B was not so hopelessly misplaced in the fourth grade there as would have been the case had she attended public school. The fact of competition with selected children reduces the discrepancy, although it is still very great. At the age of 8 years 9 months, B entered a private school in Washington, D. C. Here she was placed in the sixth grade, "skipping" the fifth grade. Her school reports have always been very excellent, "almost always E in every subject." In the autumn of 1922 B entered the seventh grade, aged 9 years 9 months. She was the youngest pupil in a class of about 20 children, and held first rank. "She leads in every regular subject except catechism, geography, and history." B "likes all subjects except catechism, giving first place, at the age of 9 years, to arithmetic. Her school marks for 1922-1923 are as follows, the marks indicating as is usual: 100, perfect; 90, very good; 80, good; 70, fair; 60, deficient." B'S MARKS, GRADE VII. AGE 9 YEARS 10 MONTHS.