ALLEN, Nathan, physician, born in Princeton, Massachusetts, 13 April 1813. He was graduated at Amherst College in 1836, after which he studied at the Pennsylvania medical College and received his degree there in 1841. He then settled in Lowell, Massachusetts, and acquired a large practice. Dr. Allen is a member of the state board of charities of Massachusetts, and since 1862 has been examining supervisor of pensions. In 1857 he was elected a trustee of Amherst College. He is the author of " The Opium Trade " (Lowell, 1853), and of numerous pamphlets on social and physiological subjects, the most important of which are " Medical Problems of the Day" (1874) ; "State Medicine and Insanity" (1876); and "Normal Standard of Women for Propagation " (1876).