SLACK, Elijah, educator, born in Lower Wakefield, Bucks County, Pennsylvania, 24 November, 1784; died in Cincinnati, Ohio, 29 May, 1866. He was graduated at Princeton in 1808, was principal of Trenton academy in 1808-'12, and was licensed by the New Brunswick presbytery as a preacher in 1811. In 1812 he was elected vice-president and professor of natural philosophy and chemistry in Princeton. He continued his connection with this institution till 1817, when he removed to Cincinnati. In that year he was elected superintendent of the Literary and scientific institute of that city, and when Cincinnati college was established in 1819 he was appointed its president, and so continued till 1828. In 1837 he established a high-school at Brownsville, Tennessee, which was successful, and in 1844 he returned to Cincinnati. He had received the degree of M. D., and was at one time professor in Ohio medical college. Princeton gave him the degree of LL. D. in 1863.--His cousin, James Richard, soldier, born in Bucks county, Pennsylvania, 28 September, 1818: died in Chicago, Illinois, 28 June, 1881, removed with his father's family to Indiana in 1837, studied law, was admitted to the bar, and became a successful lawyer. In September, 1861, he was commissioned colonel of the 47th Indiana regiment, and was ordered with his command to Kentucky. He was assigned to General Don Carlos Buell's army, but was subsequently transferred to Missouri and placed under General John Pope. With his command he participated in numerous actions. He was commissioned brigadier-general of volunteers, 31 December, 1864, major-general by brevet, 13 March, 1865, and was mustered out of the service, 15 January, 1866. After the war he resumed the practice of law, and at the time of his death, and for many years preceding, was a judge of the 28th judicial circuit of Indiana.