Plasma pH, Na, bicarbonate, and Cl analyses were determined on alligators in the fasting state and at various time intervals following feeding. The electrolyte changes accompanying the production of gastric HC1 were qualitatively similar, but quantitatively greater than those reported for other animals. Some Cl levels were as low as 15% of the fasting values and some bicarbonates were elevated 5-fold. The pH rose from an avg. fasting value of 7.3 to an avg. maximum of 7.7. pH values over 8 were observed. The Na concns. were unaffected by feeding. No correlation was found between pH and plasma Ca content.