Causes: catarrh of rumen, impaction of manifolds, debility, paresis, peritoneal adhesions, neoplasms, concretions, sudden change in diet, gastric congestion, lesions of gullet, or of mediastinal glands. Symptoms are usually after feeding only, inappetence, rumbling, costiveness, rumen indentable. Treatment: obviate causes, give salines, acids, bitters, and water, laxative food, carminatives, antiseptics, electricity, emetic tartar, eserine, pilocarpin, barium chloride, apomorphin. _Causes._ The persistence of causes of acute tympany may lead to the appearance of the condition after each meal, or even in the intervals between meals. Among the more specific causes may be named catarrhal inflammation of the rumen, impaction of the third stomach, paresis of the rumen, general debility, peritoneal adhesions affecting the viscus, tuberculosis, actinomycosis or other morbid productions in its walls, hernia of the reticulum into the chest, hard stercoral, hair or wool balls, or masses or foreign bodies in the rumen, and the ingestion of a very fermentescible quality of food. When the rumen is affected by catarrh or paresis or debility, even ordinary food will lead to tympany, but much more so any food to which the animal has been unaccustomed (green for dry, or dry for green, grain for grass or hay, or beans or peas for grain). Also food in process of fermentation, or the seat of fungoid growth. Again, so intimately related are the different stomachs that derangement of one instantly impairs the functions of the other, and thus a slowly progressive impaction of the third stomach leads to torpor of the first, and the aggregation of more or less of its contents into solid, fermenting masses. In the same way congestion of either the third or fourth stomach impairs the functions of the rumen and induces tympany. Morbid conditions affecting the functions of the œsophagus and interfering with rumination and eructation of gas are familiar causes. For example, strictures and saccular dilations of the tube, and enlargements—tubercular, sarcomatous, actinomycotic,—of the mediastinal glands. The _symptoms_ do not differ from those of acute tympany excepting that they are less severe; and are continuous or remittent, suffering a material aggravation after feeding. Rumination may be suppressed or tardy, the bowels also are torpid, the fæces glazed, and the ordinary intestinal rumbling little marked. When the tympany has temporarily subsided, the knuckles, pressed into the left side, can often be made to strike against the hard, solid impacted mass of ingesta. Symptoms of impacted manifolds may also be patent and the patient steadily loses condition.