Adaptability to bulk of food. Dilatation with atony. Eructation. Cribbiting. Vomiting. Age. Rare in cattle. Catarrh, overloading, nervous lesions, intestinal obstructions, tumors, calculi, volvulus, invagination, hepatitis. Symptoms: overfeeding, pot-belly, unthrifty hide, emaciation, eructations, cribbiting, fatigue, perspiration, indigestion, colic after meals, tympanic resonance. Lesions: varying distension, contents, action of calculus or pebbles, cardiac dilatation. Treatment: nutritive, digestible, concentrated food, lavage, strychnia, iron, faradisation, antiseptics. The stomach has a great power of accommodation to the amount of food habitually taken. In the horse fed mainly on grain with only a little hay, it is habitually small, while in one fed on cut straw with a little grain, on hay alone, or on green food, it is very much more capacious though within the physiological limits of health. The cow wintered on grain alone, has all four stomachs lessened in capacity, and though she maintains good condition she is ill fitted to change at once to the bulky grass diet of spring. The heavily fed swine, and the farina fed dog and cat, have both stomach and intestines increased in capacity over those of the wild boar, or the purely carnivorous wolf or wild cat. The condition becomes pathological when associated with atony, and this may occur directly from over distension. It is especially common in the horse by reason of the difficulty of relieving the over distension by eructation or vomiting, and also by reason of the habit of swallowing air (cribbiting). The dog, which has great facility in vomiting, should be correspondingly protected from the condition, yet it is very common in old dogs, doubtless from their common vice of gourmandizing and lack of exercise. Cattle are rarely attacked, the fourth stomach being protected by the others which stand guardian over it and prevent the sudden access of excess of food even if that is rapidly swallowed. Other _causes_ are: chronic catarrh which renders the stomach atonic, lessens its peptic secretion and determines indigestions and over distensions: habitual overfeeding which results in chronic indigestions and fermentations; lesions of the brain, and tumors of the jugular furrow or mediastinum which interfere with the functions of the vagus nerve; obstructions of the intestines which force the contents back into the stomach or hinder their exit. Thus tumors on the duodenum, calculi in stomach or intestines, volvulus and invagination have been charged with producing overdistension. Chronic hepatic disorder has also been quoted as a cause.