Contending that the Stanford Binet Intelligence Test is not based upon a sound theory of intellectual functions, this article evaluates observations of intelligence and maintains a human has a capacity unto his constructed being, unique unto himself, with a commoness relative to its species. (JC)

In an effort to isolate the emergence and causes of social class differences in intellectual performance, this longitudinal study was undertaken as a follow-up on a cross-sectional study that yielded no social class differences on the Cattell Infant Intelligence Scale for 12-, 18-, and 24-month-old black children. In the present study, 89 children…