Data used to support Spearman's hypothesis have been incorrectly and inconsistently reported and do not support the claim that African-American-white differences in intelligence are not environmental in origin. Deaf children should not be considered a single population with respect to linguistic deprivation. (SLD)

Wolff has recently reinterpreted the data of Lee to indicate that Black migration from the south to Philadelphia had been selective in an IQ-relevant manner. However, Wolff's deduction from Lee's data is shown to depend entirely upon an assumption about cumulative IQ deficit in southern Black children. (Author/CTM)