RESUMO
The evidence from all available epidemiological surveys suggests that the arterial pressure of Negro populations in the United States and the West Indies is higher than that for white populations (e.g. Gover, 1948; Comstick, 1957; Moser et al., 1959; Schneckloth et al., 1961) In the hope of finding major differences in factors influencing arterial pressure we have made comparative studies between Wales and Jamaica, and in accordance with the basic principle of geographical pathology, these surveys were designed to be exactly comparable. Those in Jamaica were done in collaboration with Drs. K.L. Stuart and J.Ling of the University College of the West Indies, and Dr. E.H, Kass of Harvard University, those in Wales in collaboration with my colleagues at the M.R.C. Pneumoconiosis Research Unit (AU)