"A rare book—at once of great importance and wonderful to read.… Gould presents a fascinating historical study of scientific racism, tracing it through monogeny and polygeny, phrenology, recapitulation, and hereditarian IQ theory. He stops at each point to illustrate both the logical inconsistencies of the theories and the prejudicially motivated, albeit unintentional, misuse of data in each case.… A major addition to the scientific literature."