Animals suffering. Causes: mercurial baths, ointments, blisters and surgical dressings; mercurial vapors; deposits on vegetation; rat poisons; malicious poisoning. Lethal dose in horse, ox, sheep and goat. Mature and old eliminate more slowly. Symptoms; Salivation; red, swollen buccal mucosa; gingivitis; loosening of teeth; fœtor; ulceration; anorexia; gastro-intestinal tympany; loose, fœtid stools; fever; weakness; dyspnœa; langor; blood extravasation in nose, mouth, throat, bowels, womb, skin; abortion; skin eruptions. Lesions in mouth, stomach, intestines, serosæ, kidneys, muscles, encephalon. Treatment; stop the introduction of mercury; as antidote potassium sulphide; emetic; cathartic; mucilaginous and albuminous antidotes; potassium iodide as an eliminating agent. Locally potassium sulphide or chlorate. Iron tonics. This has been especially seen in the sheep, dog and ox, and less frequently in other domestic animals. _Causes._ In sheep the use of baths containing corrosive sublimate, or of mercurial ointment for acariasis or other cutaneous parasitism. In other animals it comes mostly from licking mercurial dressings applied to the skin—calomel, red precipitate, mercurial ointment, protoiodide of mercury. The red iodide being more irritating is less frequently taken in. The modern extensive usage of mercuric chloride solutions as surgical antiseptics opens up a new channel of infection. In the injection of the uterus or of large abscesses, or in the daily irrigation of large wounds a dangerous amount may be absorbed. The application of this agent as a caustic in cases of tumors is correspondingly dangerous. Vapors from metallic mercury in confined spaces as in ships’ holds, or from fires on which the mercurial compounds have been thrown, are ready means of poisoning, acting primarily on the air passages and lungs and later on the mouth. The condensation of mercury on vegetation and other food products in the vicinity of factories where mercury is handled (Idria) affects domestic animals directly. Finally the small animals are poisoned by eating the mercurial rat poisons, and all animals are subject to malicious mercurial poisoning, with sublimate especially. Stomatitis with fatal pharyngitis and enteritis will result in the horse from 2 drs. of corrosive sublimate. About one-half of this may poison the ox, and one-fourth the sheep or goat. Ruminants are more susceptible to the toxic action of mercury than monogastric animals, one evident reason being the long delay of the successive doses in the first three stomachs, so that finally a large quantity passes over at once into the fourth stomach and duodenum for absorption. The old too are more readily poisoned than the young, as the functions of the kidneys are more impaired in age and the poison is not eliminated with the same rapidity.