Skin resistance, sweat-gland counts, salivary flow, gastric secretion, and pH were measured in volunteers and patients of both sexes, Negroes and Caucasians. Correlational analysis suggested two negatively related clusters: (A) salivary flow, sweat-gland counts, and gastric secretion ; and (B) age, skin resistance, and pH. Skin resistance was higher in Negroes than Caucasians, and in females than males, increasing irregularly with age.
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