GREEN, Traill, chemist, born in Easton, Pennsylvania, 25 May, 1813. He was graduated at the medical department of the University of Pennsylvania in 1835, was for a year physician to the Philadelphia dispensary, and then settled in Easton, where he has since practiced. In 1837 he was elected professor of general and applied chemistry in Lafayette, and four years later was called to the chair of natural sciences in Marshall College, where he remained until 1847. He returned during the same year to Easton, resuming his chair in Lafayette, which he has since occupied. At his own expense he erected an observatory there, and on the establishment of the Pardee scientific department of Lafayette he became its dean. Dr. Green has held several state appointments in connection with hospitals and similar work, and was for some time president of the school board at Easton. He is a member of many scientific societies, was president of the Pennsylvania medical society in 1868, and first president of the American academy of medicine. He delivered the annual address before the medical department of the University of Pennsylvania in 1880, and received the degree of LL. D. from Washington and ,Jefferson Colleges in 1866.