Race crossing in Jamaica

ABSTRACT

A quantitative study of 3 groups of agricultural Jamaican adults Blacks, Whites, and hybrids between them; also of several hundred children at all developmental stages. The studies are morphological, physiological, psychological, developmental and eugenical. The variability of each race and sex in respect to each bodily dimension and many bodily organs is discussed. It appears that mental traits which seem to have a genetic basis vary just as morphological traits do. In some sensory tests the Blacks are superior to Whites; in some intellectual tests the reverse is found. A portion of the hybrids are mentally inferior to the Blacks. The negro child has, apparently, from birth on, different physical proportions than the white child. See also Publications Nos. 188, 236 and 259. Other books on human heredity published by Carnegie Institution of Washington are Nos. 295 and 296. (AU)