On the mechanism of secretion of ions by gastric mucosa and by other tissues.

owing to its higher molarity. The amylopectin which accompanies it,into the infusion, amylopectin I, gave much lower blue values with iodine than the other preparations, and indeed resembled in this respect the best preparation otherwise obtained. It can scarcely be representative of the amylopectin of potato starch, and presumably consists of the smaller or less complex molecules. It is worthy of note that infusion of potato starch for 15 min. at 630, followed by a further 15 min. at 45-50 before centrifuging, led to the separation of fractions of both amylopectin and amylose, which differ from the main portions of these substances.