Book reviews : The New Assault on Equality: IQ and Social Stratification Edited by A. GARTNER, C. GREER, and F. RIESSMAN (New York, Harper & Row, 1974). 225 pp. $1.95 Race and IQ Edited by A. MONTAGU (London, Oxford University Press, 1975). 322 pp. £2.00 Race Differences in Intelligence By J.C. LOEHLIN, G. LINDZER, and J.N. SPUHLER (San Francisco, 1975). 380 pp. $5.95