Cases of primary inflammation are rare, in keeping with the soft finely divided condition in which the food reaches the organ. It may, however, occur in case of the ingestion of arsenic and other irritant poisons, or of goring, kicks and other injuries on the right hypochondrium, or from the irritation attendant on impaction, or again from the stimulus of a sudden change to rich green food. The _lesions_ in such a case are congestion of the folds with patches of ramified redness, blood extravasations, desquamation, softening or even gangrene. False membranes, perforating ulcers, and erosions are sometimes present. In the chronic forms grayish or slate colored pigmentation of the mucosa, congestions and papillary growths are common. In both acute and chronic forms the congestion entails loss of contractility and thus impaction and drying of the ingesta between the folds of the organ are constant. _Symptoms._ These are the symptoms of impaction of the manifolds, impaired appetite and rumination, formation of solid masses in the rumen, tympany, tenderness or pressure on the right hvpochrondrium, irregularity of the bowels, arching of the back and grunting when made to walk. The addition of fever, as evidenced by rectal hyperthermia, hot horns, ears, legs and muzzle, serves to diagnose it from simple impaction. The _course_ of the malady is the same as in impaction, but with an even greater tendency to aggravation and a fatal result as the inflammation entails a paresis of the walls of the viscus which favors a constant accumulation and dessication of the interlaminar material. _Treatment._ This must be largely on the same line as in impaction, laxatives of sulphate of soda, a diet of flaxseed or barley gruel, and drinking water rendered demulcent with slippery elm. These must be supplemented by a mustard or other blister to the right hypochondrium, by soothing doses of nitrate of bismuth (½ ounce), and hypodermic injections of eserine (1½ grain), veratrine (1 grain), or pilocarpin (3 grains). A current of electricity sent through the right hypochondrium once or twice a day, will further be desirable. When convalescence has set in, mashes of wheat bran and middlings may be allowed, to keep up the flagging vigor, and the patient should be returned to solid, fibrous food by slow degrees only. TUMORS OF THE OMASUM. Papilloma. Sarcoma. Actinomycosis. Tumors of the omasum have been seen only as papilloma, and sarcoma.