Apologize for going ot, but these kinds of things need to be said. This is by the author of A Study of American Intelligence a mere seven years after writing the chilling words NJ quotes above
Carl Bingham writes:
"Comparative studies of various national and racial groups may not be made with existing tests...one of the most pretentious of these, my own, is without foundation"
- Carl Bingham quoted in Marks, Russel (1972) Testers, Trackers, and Trustees: The Ideology of the Intelligent Testing Movement in America, 1900-1954. University Microfilms.
Also I have a paper from the journal School Review by Frank N. Freeman (1923) that absolutely crushes the Bingham book based on then-understood concepts in evolutionary biology and statistics. Freeman's main critique is that Bingham does not, in 217 pages, even discuss the possibility that differential education could play a part! (Freeman, FN (1923) An Evaluation of American Intelligence Vol 38, No 8. Pg 627-628.)
"I have seen so far because I have stood on the bloated corpses of my competitors" - Dr Burgess Bowder