In the same year he became professor of mathematics and natural philosophy in the University of Mississippi, of which institution he was chancellor from 1856 until the outbreak of the Civil War, when, his sympathies being with the North, he resigned and went to Washington.
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His brother, John G. Barnard was a career engineering officer in the U.S. Army, serving as the Superintendent of the United States Military Academy and then as a general in the Union Army during the American Civil War.
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He was then in turn a tutor at Yale, and as he began to lose his hearing due to a hereditary condition he became a teacher (1831—1832) in the American Asylum for the Deaf and Dumb at Hartford, Connecticut, and a teacher (1832—1838) in the New York Institute for the Instruction of the Deaf and Dumb.
Johnson's Universal Cyclopaedia in turn was a revision of the 1876 Johnson's New Universal Cyclopaedia, which was published in 4 volumes by Alvin J. Johnson & Co., and edited by Frederick Barnard and Arnold Guyot.
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