JOHNSTON, John, educator, born in Bristol, Maine, 23 August, 1806; died in Clifton, Staten Island, New York, 2 December, 1879. He was graduated at Bowdoin in 1832, and began to teach in Oneida conference seminary, Cazenovia, New York, becoming its principal in 1835. During the latter year he was elected lecturer on natural science and assistant professor of mathematics in Wesleyan university. He was made full professor of natural sciences in 1837, and continued in the occupancy of that chair until 1873, when he was made professor emeritus. In 1850 he received the degree of LL. D. from McKendree college, and he was a member of the Philadelphia academy of sciences, and the American association for the advancement of science. Besides scientific papers contributed to the "American Journal of Science" and other periodicals, he published "A Manual of Chemistry" (Middletown, 1840" 6th ed., 1856); "A Manual of Natural Philosophy" (Philadelphia, 1846" revised ed., 1851); "Primer of Natural Philosophy" (1858); and "A History of the Towns of Bristol and Bremen in the State of Maine" (Albany. 1873).