HILL, Thomas, president of Harvard college, born in New Brunswick, New Jersey, 7 January, 1818. His father, an Englishman, was a tanner, and also served as judge of the superior court of common pleas. The son was left an orphan at an early age, and was apprenticed to a printer in 18a0 for three years. He then went to the Lower Dublin academy near Philadelphia for one year, and was apprenticed to an apothecary in New Brunswick, but afterward entered Harvard, where he was graduated in 1848, and at the divinity school in 1845. He settled in Waltham, Massachusetts, in 1845, in charge of a Unitarian congregation, and preached there for fourteen years. In 18.59 he succeeded Horace Mann in the presidency of Antioch college, Ohio, and during his service there was also pastor of the Church of the Redeemer in Cincinnati. He became president of Harvard in 1862, and held this office until 1868, when he resigned on account of impaired health. He retired to Waltham, and in 1871 he served in the legislature, after which he accompanied Louis Agassiz on the coast-survey expedition to South America. On his return he accepted a call to the Unitarian church in Portland, Maine, where he now (1887) resides. His mathematical genius showed itself early in life, and he has displayed great originality and fertility in the investigation of curves, adding to their known number and simplifying their expression. He has invented several mathematical machines, the principal one being an occultator, by which occultations visible west of the Mississippi in the years 1865-'9 were calculated for publication in the "American Nautical Almanac." The degree of D. D. was conferred upon him by Harvard in 1860, and that of LL. D. by Yale in 1863. He has delivered addresses before the Phi Beta Kappa society of Harvard on "Liberal Education" (1858), and on the "Opportunities of Life" at Antioch (1860). He has edited Eberty's " The Stars and the Earth " (1849; new eds.. Boston, 1874 and 1882); and has published "Christmas, and Poems on Slavery "(Boston, 1843); "Geometry and Faith" (New York, 1849; revised eds., New York, 1874, and Boston, 1882); "First Lessons in Geometry" (Boston, 1854); " Second Book in Geometry" (Boston, 1862); "Jesus, the Interpreter of Nature, and Other Sermons" (1859); "Practical Arithmetic" (1881); and contributions to numerous periodicals, mathematical and astronomical journals, and religious newspapers.--His son, Henry Barker, chemist, born in Waltham, Massachusetts, 2'7 April, 1849, was graduated at Harvard in 1869, after which he studied chemistry at the University of Berlin, Prussia. in 1870 he was appointed assistant in the laboratory of Harvard, and was assistant professor of chemistry from 1874 till 1884, when he became full professor. He is a member of scientific societies, both in the United States and Europe, and in 1883 was elected to the National academy of sciences. Professor Hill has published the results of his chemical researches in the "Proceedings of the American Academy of Arts and Sciences," and is the author of "Notes on Qualitative Analysis" (New York, 1874).