Abstract
Curves are presented comparing the course of gastric secretion after histamine with that after histamine and atropine [in 7 patients]. The volume of secretion, titratable acidity, concentration of pepsin, total output of acid and total output of pepsin have been studied. Atropine dissociates the normal response to histamine, producing a marked decrease in the volume of secretion, and in the concentration and total output of pepsin. The titratable acidity rises as a result of the only slight inhibitory effect of atropine on the total output of acid. The results suggest that water, acid and pepsin may have different mechanisms of secretion.