_Treatment._ Induce emesis as in the dog. Give vinegar in case of alkaline poisoning. Follow this by a laxative if the irritants have gained the intestines, and finally a course of iron or bitters. Careful dieting is absolutely essential. ACUTE CATARRHAL GASTRITIS IN THE HORSE. Causes: wet fermented food, cryptogams, bacteria, sprouted green potatoes, sand, irritants, hot food, frosted food, ill health, starvation, anæmia, siliceous plants, diseased teeth or salivary apparatus, parasites, calculi, specific inflammations. Symptoms: depraved appetite, licking soils, walls, filth, etc., clammy mouth, red bordered tongue, eructations, colic, rumbling, tympany, icterus, costive, coated fæces, tender hypochondrium, anorexia, emaciation. Lesions: stomach full or nearly empty, pyloric sac congested, mucosa thickened, petechiated, with excess of mucus and desquamated epithelium, cells swollen opaque, congested duodenum, pale yellow liver, with excess of pigment in cells, also in urine, ruptured stomach, hemorrhagic infiltrations. Treatment: careful dieting, laxative, stomachics, pepsin, antiferments, bitters, ipecacuan. _Causes._ This is a much less common affection in horses than dogs and is usually charged on some fault in diet. Fodders that have been badly harvested or wet from any other cause and are musty, dusty, rusty, or covered with any irritant or poisonous cryptogams or bacterial ferment, sprouted oats, or potatoes that have become green by exposure to the sun, sand and gravel in the grain, irritant plants like ranunculus, euphorbium, veratrum, etc.; cooked food given too hot, or vegetable food given frosted; putrid water, and indeed all the causes of indigestion tend to produce gastric catarrh. Weakness of the stomach and gastric functions from any cause is a concurrent factor. Thus extensive inflammations and violent fevers, prolonged abstinence, starvation, anæmic and parasitic affections, the action of frozen food on the viscus, are to be feared. A horse which has been for a week or more without food is extremely subject to such attacks unless fed with the greatest caution at first. Irritant plants like carex, equisetum, etc., which act mechanically by reason of the contained silica, food imperfectly masticated on account of disease of the jaws, teeth or salivary glands, parasites like spiroptera and bots and phosphatic and oat-hair calculi, act mechanically. Finally certain affections like petechial fever, influenza, pneumonia, pustulous stomatitis and horse pox may develop local foci of inflammation in the stomach. When once started, microbian infection tends to maintain and aggravate it.