FROM various parts of the world one gets reports of differing serum globulin values.1 2 3 4 5 The areas with a predominantly Negro population tend to have higher "normal," or usual, values than those with a predominantly white population. These differences have been ascribed to the prevalence of various chronic diseases, which presumably result in elevated globulin levels. However, Comens6 has demonstrated a significant difference between the levels of Negro and white patients in his hypertensive clinic in St. Louis, Missouri, a finding that suggests the possibility of a racial difference. As part of a study of the epidemiology of sarcoidosis, determinations of . . .