Erickson implies that Special-Training-Unit results allow no comparison of Negro-white ability because the Negroes represented a superior selection within their group (see 21: 1262). The S-T-U results are re-examined with emphasis on the similarity of trends of educational opportunity and rejection rates for Negroes and whites. Witty repeats his contention (see 20: 747) that intelligence tests do not predict learning ability of persons with restricted educational opportunity. Negroes and whites classified in each of 4 educational groups made essentially similar progress in training and were much more educable in S-T-U than had been assumed by outsiders. (PsycINFO Database Record (c) 2006 APA, all rights reserved)