On the mechanism of periodic activity of the digestive apparatus outside of digestion

About work of the digestive apparatus outside the period of digestion we had till 1904 only separate, fragmentary indications (Bruno, Shirokikh, Walter, Cheshkov, Klodnitsky, Katznelson, and only with occurrence of capital research of Prof. V.N.Boldyrev this question became a subject for all-round and wide studying. Periodic activity of the digestive apparatus has been established on many animals, Boldyrev on dogs, Mangold on birds, Boldyrev on chickens, Boldyrev and Shcherbakov on cats and, finally, S. Anichkov on man. According to the assurance of Prof. Boldyrev, such activity is peculiar to all animals.