The author suggests that more empirical evidence will have to be found before environmental influence can be declared insufficient to the cause of Negro-White I.Q. score differences. (Editor/RT)

From the monthly Saturday Review supplement, "Education in America, sponsored by the Charles F. Kettering Foundation.

This paper is the first chapter of a book and is divided into six sections. The first section discusses race taxonomy, the Negro American's origins from Africa, and the origin of race differences. The second section investigates the genetic aspects of race differences in intellectual performance, and includes a lengthy introductory discussion on…

Reviewed are findings in the literature of racial differences in intelligence which are consistent in revealing "real differences in test performance between Negroes and whites." The interpretation that these racial differences are due to cultural bias in the tests is denied. A discussion of the genetic vs. environmental etiology of the…

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…

Once again intelligence tests are being used as the major basis to establish the genetically determined limitations of minority and economically disadvantaged groups. By reviewing the arguments regarding the I.Q. test and the hereditability of intelligence, the author compares these with two sets of phenomena: the I.Q. test scores and the…

The history and use of intelligence testing are reviewed, with emphasis on the validity of intelligence tests for black populations. Different definitions of intelligence are summarized, followed by an historical review of intelligence testing. The work of Alfred Binet is discussed, as well as the validity and reliability of his scales. A…