CAMPBELL, John Lyle, chemist, born in Rock-bridge County, Virginia, 7 December, 1818; died in Lexington, Virginia, 2 February, 1886. He was graduated at Washington College (now Washington and Lee) in 1843. On leaving College he became assistant in the academy at Staunton, Virginia, and afterward had charge of a similar institution in Richmond, Kentucky In 1851 he was called to the chair of chemistry and geology at Washington College, an office which he con-tinned to occupy until his death. He was a recognized authority on the geology of Virginia, and wrote reports on that subject as well as frequent contributions to the scientific journals. Among his larger works were: "Geology and Mineral Resources of the James River Valley" (1882), and "Campbell's Agriculture ; A Manual of Scientific and Practical Agriculture for the School and Farm" (Philadelphia, 1859).