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uniform and temperate season of summer. Sitting or lying on cold and damp ground, or grass, or in a current of cold air, will often bring the disease on.

An attack of measles, or scarlatina is apt to bring this disease on in the convalescent stage. It is said that the predisposition to the disease is very much increased by having once suffered an attack of the disease.

Pathology. _ Cynanche trachealis consists in an inflammation of the mucous membrane of the glottis, larynx, and the trachea, it either closes up the air passages, by the thickening of the mucous coat, and thereby preventing the free access of air into the lungs, or throws out a thick tenacious mucus, which adheres to the walls of the trachea; the tonsils are