This paper critically examines the portions of Arthur Jensen's books, "Genetics and Education" and "Educability and Group Differences," that concern Barbara Burks' 1928 study of adoptive families. Jensen cites the low correlations of children's IQs with measures of home environment from Burks' study as evidence that environment plays only a minor role in the determination of intelligence. The finding here is, however, that Burks' sample was highly selective, that her environmental measures were limited, and that Jensen has thoroughly misrepresented the content and implications of the Burks' study. (Author/AM)