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A distinguished American astronomer; born in Boston, Sept. 27, 1824; died at Cambridge, Nov. 26, 1896. He graduated at Harvard in 1844 and after wards studied abroad. In 1849 he received an appointment to the United States Coast Survey, and devised methods for determining the longitudes telegraphically. From 1870 to 1885 he was director of the national observatory at Cordova, Argentine Republic, where he completed three extensive catalogues of stars, and conducted meteorological and climatological investigations. He was the founder and editor of the Astronomical Journal (1849-61). His principal works are: "On the Transatlantic Longitude, as Determined by the Coast Survey" (1869); "Uranometria Argentina" (1879), which gives the brightness and the position of every fixed star, to the seventh magnitude inclusive, within 100 degrees of the South Pole.