=Symptoms.= Inflammation of the rumen or reticulum is announced by loss of appetite, suspension of rumination or of regular peristalsis, slight tympanites, and particularly by excessive sensitiveness to palpation. This sensitiveness is general, but is more specially marked in the left lower third of the abdominal cavity, and in the retro-ensiform region which corresponds to the position of the reticulum. Moderate fever is present. These symptoms, which indicate the gravity and intensity of the inflammation, may persist, become aggravated, provoke vomiting from the rumen, and leave as a legacy motor dyspepsia, or even more serious consequences. On the other hand, they may progressively diminish and disappear for good. =Lesions.= The lesions comprise hyperæmia of the walls of the rumen and of the mucous membrane, extensive local exfoliation of epithelium, and sometimes true ulceration of the mucous membrane. =Diagnosis.= The diagnosis is based on the exceptional sensitiveness of the gastric compartments on palpation, and also on the history, provided reliable information can be obtained. =Prognosis.= The prognosis should be reserved, because it is never possible to foretell whether acute lesions may not give place to chronic disease, which, though apparently unimportant, may terminate in grave consequences. =Treatment.= Owing to their local action demulcent drinks and teas are indicated. Cooked food is useful, because it makes little demand on the digestive powers; steamed hay and farinaceous substances are given, both on account of their nutritious qualities and of the slight local irritation they cause when swallowed. Lukewarm drinks and saline laxatives, such as the sulphate of soda, and carbonate of soda or Carlsbad salt in small doses of 1½ to 2 ounces, seem most useful in combatting the reflex atony of the digestive compartments. =Inflammation of the omasum=, like that of the rumen and reticulum, occurs as a secondary phenomenon in conditions like rinderpest, Texas fever, foot-and-mouth disease, anthrax, and gangrenous coryza (malignant catarrh); but primary inflammation is much rarer even than that of the rumen and of the reticulum. This is accounted for by the deep position of the omasum, which is thus sheltered from external violence, early contact with irritant foods and from the effect of chills, etc. It can only become inflamed by the prolonged action of irritant food and drink, which have already produced lesions in the rumen and reticulum; or as a consequence of the prolonged stagnation of dry food in cases where animals have been deprived of water.