_Father_ _Mother_ Below 25 2 1 From 25-30 3 4 30-35 2 2 35-40[+] 3 1 Median age of fathers, 31; of mothers, 28.5. Of the 11 cases where the facts are known, 5 are only children; 4 have one sibling; 1 has 2 siblings and 1 has more than this. In 5 cases where the child in question is not an only child, he or she is the eldest sibling. That is, in 10 of the 12 cases the child is a first-born, so far as the records show. In a few cases the IQ of the sibling (or siblings) is known. Such IQ's are invariably above 130, in most cases much higher but in no case so high as the 180 that would have been required to admit them to the group here considered. Otherwise, of course, they would have been included in the study. Of the 12 cases here described, 4 are girls. It has already been noted that among the 19 cases cited from the literature of gifted children there were 12 girls and 7 boys. The total of 31 cases which this study now makes available comprises 16 girls and 15 boys--as equitable a division of the honors as an odd number makes possible. PHYSICAL AND BEHAVIORAL DEVELOPMENT No single item indicative of early developmental pace in physique and movement is given for all the 12 cases. For most of them records are given on walking, talking, reading, first tooth, height, and weight. Grip is recorded in 5 cases, weight at birth in 3 only. These data are summarized in the following table. Since height, weight, and grip were taken at varying ages on the different children, all that is indicated in these columns is "above normal" (##) or "below normal" (--). AGE OF AGE OF AGE OF FIRST CHILD WALKING TALKING READING TOOTH HEIGHT WEIGHT GRIP (MONTHS) (MONTHS) (YEARS) (MONTHS) A 11 3 ## ## ## B 15 9 3 7 ## ## ## C 15 16 3 9 -- -- D 12 11 1.5 4 ## -- E 13 24 8 ## Normal -- F 14 12 4.5 10 G ## ## -- H 14 16 4 9.5 ## -- I 10.5 21 3 5 ## ## J K 20 24 3 6 ## ## L 15 9 4 9 ## ##