R, their first child, was born when the mother was thirty and the father was thirty-five. His early development was exceedingly precocious. His first tooth erupted at five months of age; he began to walk at nine months and was running at eleven months; he was talking in sentences at eleven months; he learned to read at four years of age, and was reading omnivorously before he entered school. When he entered school he had an unusual vocabulary, using such words as "casuistry" and "disproportionate." At the age of 2 he was modeling in clay, and at the age of 3 he began to design and make machines. He applied through his father to the United States Patent Office for two patents before he was 8 years old. At 8 years of age he had a large library in his home composed mostly of books of science, history, and biography, which he had catalogued himself, on the Dewey decimal system. At this age he was writing a book on electricity. Also at the age of 8 he had a small machine shop in which he was working on his machines. At the age of 6 he enjoyed discussing philosophy. At the age of 7 he would debate on the significance of religion in world development. The day he first came to the Clinic, Claudel's experiments on developing power by raising the colder water from the lower levels of the sea had just been reported in the scientific section of the _New York Times_. R explained the theory involved much more clearly than had the scientific writer of the _Times_. R is well developed physically, above average in height, and considerably above average in weight, likes the outdoors, especially hiking and riding horseback. At the age of 9 he showed the first symptoms of the approach of puberty. R is well adjusted to his school and his playmates, plays on their soccer and baseball teams, is well liked, and is a leader in many of their activities. _Other cases_. In addition to these children who have been somewhat fully described, a few others testing above 180 IQ (S-B) have been mentioned in the literature of gifted children or their records have appeared in tabulations. In 1923 Dvorak told of a boy of IQ 183 (S-B) who was examined at the University of Minnesota. This boy was conspicuously maladjusted at school. He "hated school," and did poor work there. He was 8 years 7 months old at the time of examination, and passed the tests at a mental level of 15 years 9 months. The educational authorities were unsympathetic and resistant to advice, but finally placed the child in the fifth grade, where both work and conduct improved greatly. This observer also mentions a boy of 189 IQ (S-B) who was tested at the same University.