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Water Brain Fever, Whytt's Disease, is generally seated, according to modern observers, in the meninges and surface of the encephalon, and is a tuber'cular meningi'tis. It is observed particularly in childhood. Its march is extremely acute and often very rapid; admitting, generally, however, of division into three stages. The symptoms of the first stage are those of general febrile irritation, with headache, intolerance of light and sound, delirium. Those of the second, which generally denote that the inflammation has ended in effusion, are, great slowness of pulse, crying out as if in distress, moaning, dilated pupil, squinting, and lastly, in the third stage- profound stupor, paralysis, convulsions, involuntary evacuations, quick pulse, and frequently death. The disease is of uncertain duration; sometimes, destroying in two or three days; at others, extending to two or three weeks. The prognosis is unfavourable. The treatment must be active during the stage of excitement, - precisely that which is necessary in phrenitis. In the second stage, the indication is; - to promote the absorption of the effused fluid. This must be done by counter-irritants, and mercury, chiefly. On dissection, water is generally found in the ventricles, or at the base of the brain; or there are evidences of previous vascular excitement, as effusions of coagulable lymph.