ST. JOHN, Isaac Munroe, engineer, born in Augusta, Georgia, 19 November, 1827; died in Greenbrier White Sulphur Springs, West Virginia, 7 April, 1880. After graduation at Yale in 1845, he studied law in New York city, and removed to Baltimore in 1847, where he became assistant editor of the " Patriot," but chose civil engineering for a profession, and was engaged on the Baltimore and Ohio railroad. In 1855 he removed to Georgia, and was employed on the Blue Ridge railroad until the beginning of the civil war, when he entered the engineer corps of the Confederate army at Richmond, Virginia, and was as:signed to duty under General John B.Magruder. He rendered valuable service in constructing fortifications during General George B. McClellan's first campaign. In May, 1862, he was made major and chief .of the mining and nitre bureau, which was the sole reliance of the Confederacy for gunpowder material. He was promoted through the various grades to the rank of brigadier-general, and in 1865 was made commissary-general, and established a system by which supplies for the army were collected directly from the people and placed in depots for immediate transportation. After the war he resumed his profession in Kentucky, became chief engineer of the Louisville, Cincinnati, and Lexington railroad, and built the short-line to Cincinnati, which was considered a great feat in civil engineering. He was city engineer of Louisville in 1870-'1, made the first topographical map of that city, and established its system of sewerage. From 1871 until his death he was consulting engineer of the Chesapeake and Ohio railroad, and chief engineer of the Lexington and Big Sandy railroad.