BONNEVILLE, BENJAMIN L. E. (c. American military engineer and explorer, was born in France about 1795. He emigrated to the United States and graduated at the U. S. Military Academy at West Point in 1815. In 1831-36, having obtained leave of absence from the army, he conducted an explor ing expedition to the Rocky Mountains. After being cut off from civilization for several years, he returned with a valuable account of his adventures, which was edited by Washington Irving and published under the title The Rocky Mountains: or Scenes, Inci dents, and Adventures in the Far West; from the Journal of Captain Benjamin L. E. Bonneville of the Army of the United States (2 vol., 1837), subsequent editions bearing the title The Adventures of Captain Bonneville, U.S.A., in the Rocky Moun tains and the Far West. He became a major in 1845, and was breveted lieutenant-colonel for gallantry during the Mexican War. He became a colonel in 1855, commanded the Gila river expedition against the Apaches in 1857, and from 1858 to 1861 commanded the department of New Mexico. He was retired in 1861, but served during the Civil War as recruiting officer and commandant of barracks at St. Louis, Mo., receiving the brevet rank of brigadier-general in 1865. He died at Fort Smith, Ark., on June 12 1878. The extinct glacial lake which once covered what is now north-western Utah has been named in his honour.