Courtesy of Ron Unz you can now, for free, read Volkmar Weiss’ 1991 contemplation on a question that I have been asking. For both the neoeugenic and dysgenic folk the topic should be of some interest. The relative homogeneity in general mental ability suggests stabilizing environmental forces which moderate deviations from a golden mean. What are they?
German Central Agency for Genealogy, Leipzig The gene of the ability to taste phenyhhiocarbamide (PTC), a psychophysiological trait, has (see Weiss, Lehrl, and Frank 1986, p. 142) a frequency of about 0.50 among Caucasoids, a frequency of about 0.38 among Japanese, of 0.13 among Navajo-Indians, and of 0.70 among Australian aborigines. The most impressive fact of Lynn’s review on race and population differences in intelligence is their smallness. Differences between social strata within one population are larger than between races. We all know that an occupational group with higher education, whether black, white or yellow, has a mean IQ of about 125, the social stratum of unskilled workers a mean of about 90. In view of such social differences it will be always controversial, to draw from a lower mean of the Blacks in the United States the conclusion that Negroids are generally less intelligent. At best, such an inference should be based on representative samples of Caucasoids compared with pure Negroids from Africa where all social ranks are filled by one and the same race. Lynn’s review showing a 30 IQ difference between Caucasoids and pure African Negroids is more persuasive evidence that this difference has a genetic basis than has hitherto been available.
Despite many thousand years of relatively independent evolution. Mongoloids in East Asia and Caucasoids in Europe (and in the New World) appear to have very similar gene frequencies of general intelligence….