_Lesions._ The changes consist mainly in hypertrophy of the gastric mucosa, with changes in the epithelium and submucosa such as are already described in the horse. The pyloric region suffers most, and here ulcers are not at all uncommon. _Treatment._ The main aim must be to remove the causes, and to build up the general health, so that the patient may rise above the debilitating conditions. More is to be expected from the change of diet to green food, roots, mashes, etc., and an outdoor life than from the action of medicines, which are liable to disappear by absorption in the first three stomachs, so that they can only act on the fourth through the system at large. Yet benefit may be expected from the use of nitrate of bismuth, and salol, as calmatives and antiferments, nux vomica as a tonic and even from pepsin and muriatic acid as digestive agents. The two last are not dependent on the fourth stomach for their activity but will digest the contents more or less in the first three, and the finely disintegrated and partly peptonized ingesta coming to the fourth stomach in a less irritating, and less fermentescible condition, lessens the work demanded of that organ and gives a better opportunity for recuperation. Small doses of common salt and one or other of the carminative seeds may be added. The application of mustard or oil of turpentine to the right hypochondrium will sometimes assist in giving a better tone to the organ. CHRONIC GASTRITIS IN SWINE. Causes. Symptoms: inappetence, dullness, arched back, colic, irregular bowels, fever, emaciation. Treatment: diet, green food, milk, mashes, cleanliness, bismuth, salol, sodium bicarbonate, strychnia, pepsin, muriatic acid, sunshine, washing. _Causes._ These are like those producing the acute affection which may easily merge into this by a continuation of such causes. The _symptoms_ too are alike. Inappetence, dullness, prostration, arched back, vomiting, colic, constipation, with alternating diarrhœa. There is hyperthermia with hot dry snout, thirst, increasing emaciation, and anæmia. _Treatment._ An entire change of diet, to green food, roots, fresh milk, and soft mashes in limited quantity. Allow pure water freely. Adopt all precautions against contamination of the food by the feet or snout. The stomach may be quieted by oxide of bismuth (20 grs.) or salol (10 grs.) two or three times daily, and the tone and secretions of the stomach may be stimulated by bicarbonate of soda (1 dr.) and nux vomica (1 to 2 grs.) thrice daily. In addition pepsin and muriatic acid may be given with each meal in proportion adapted to its amount. A life in the open air, and an occasional soapy wash will do much to restore healthy gastric functions. CHRONIC GASTRITIS IN THE DOG.