TREATMENT.—The disease is incurable, and diseased animals should be killed at once, the bodies burned and the premises disinfected as given under Abortion, page 122. The healthy animals should be moved to another pasture and the infected pasture burned off the following winter, this destroys the germs in that pasture. Cattle may be rendered immune to Black Leg by vaccination. The vaccine with directions for its use is given away to stock owners by the Chief of the Bureau of Animal Industry, U.S. Department of Agriculture, Washington, D. C. Foot and Mouth Disease—Eczema Epizootica DEFINITION.—An acute, contagious fever, characterized by the formation of vesicles and ulcers, chiefly about the mouth and hoofs, etc. The eruptions appear on the mucous membrane of the mouth, on the fetlock, and in the cleft of the hoofs, and not unfrequently as a eruption on the udder. The disorder chiefly prevails among cattle and sheep, but under favoring circumstances, also attacks other domestic quadrupeds, and even man. CAUSES.—It appears as an epidemic, and spreads exclusively by contagion. The precise nature of the germ is unknown, but it is chiefly limited to the contents of the vesicles, the secretion of the ulcers, the saliva, the blood and the natural secretions and excretions, of the diseased animal; and these convey the disease. The predisposing causes are exposure to cold, wet, currents of cold air, poor fodder, want of cleanliness and good housing; and anything that tends to lower the constitutional vitality. The activity of the virus is preserved for many months. The poison may be conveyed by the clothes of herdsmen and other persons, by manure, tools, fodder, by grass and ground previously trodden by diseased animals, and milk to suckling calves, indeed by almost anything. It finds its way into the system in various ways, not depending on any wound for admission. The communication to man is by drinking the milk of diseased cows. A second attack is rare.