William Alexander Hammond, an American physician, born at Annapolis, Md., Aug. 28, 1828. He graduated in the medical department of the New York university in 1848, and from 1849 to 1850 was an assistant surgeon in the army. In October, 1860, he was appointed professor of anatomy and physiology in the university of Maryland. He was reappointed assistant surgeon in the army, May 28, 1861, and was surgeon general from April, 1862, to August, 1864, when he was dismissed by sentence of a court martial. He then removed to New York, and is now (1874) professor of diseases of the mind and nervous system, and of clinical medicine, in the Bellevue hospital medical college, and physician-in-chief to the New York state hospital for diseases of the nervous system. He has published "A Treatise on Hygiene, with special reference to the Military Science" (8vo, Philadelphia, 1863); " Physiological Memoirs " (1863); Lectures on Venereal Diseases " (1864); "On Wakefulness, with an Introductory Chapter on Sleep" (1865); "Insanity in its Medico-Legal Relations" (New York, 1866); "Sleep and its Derangements" (12mo, Philadelphia, 1869); "Physics and Physiology of Spiritualism" (12mo, New York, 1870); "Treatise on Diseases of the Nervous System" (1871); and "Insanity in its Relations to Crime" (1873). He has also edited " Medical and Surgical Essays " (1864); and translated from the German Meyer's "Electricity in its Relations to Practi-cal Medicine" (1869; new ed., 1874).