_Causes._ Irritants of various kinds, fermented or putrid swill, spoiled vegetables, irritant molluscs or larvæ, too hot or too cold aliment, excess of brine, excess of alkalies, in swill (dishwashings), indigestible foods of all kinds. The stomach may also be the seat of catarrhal inflammation in hog cholera, swine plague, rouget, diphtheritic affections and in the case of gastric parasites, so that it is very important to distinguish the affections due to simple irritants, from those dependent on plagues and parasitism. _Symptoms._ There is inappetence, vomiting, restlessness and constant movement, colics, vomiting, constipation or diarrhœa, hyperthermia, stiffness, tenderness of the abdomen to handling, arched back, a disposition to hide under the straw, plaintive grunting when roused, drooping of the tail. The tendency is to a rapid recovery after the evacuation of the stomach by vomiting, though it may persist under a continuance of the irritating ingesta. In these last cases the _lesions_ may closely resemble those of the contagious affections of the abdomen, but the disease may be distinguished by its indisposition to spread beyond the herd which is subjected to the unhealthy dietary. _Treatment._ Change the diet to one of pure and easily digestible materials, soups, mush, fresh whey or buttermilk, boiled farinas or flax seed, and even fresh grass. If there is violent diarrhœa boiled milk is often of great value. Whatever food is given should be furnished in a vessel into which the animal can’t get his feet, as these are usually charged with septic germs which are pathogenic to the diseased stomach, though they may have started from ordinary saprophytes. For the same reason it is usually desirable to change the pen, as the animal grubbing in the ground charges the snout with the same offensive microbes. If vomiting is not already established, 30 grains of ipecacuan may be given, or tepid water may be used to assist the process. If constipation is present 10 to 30 grains of calomel (according to size) may be given. In case of diarrhœa a combination of calomel 1 part and chalk 12 parts, may be given in 3 grain doses, two or three times a day. Or ½ to 1 drachm nitrate of bismuth may be substituted. Cleanliness in food and surroundings is among the most important measures, and if the skin has been filthy, repeated washing with soap and warm water may be resorted to with great benefit. CHRONIC GASTRIC CATARRH IN SOLIPEDS.