JACKSON, CHARLES THOMAS (1805-S0). An American scientist, born at Plymouth, Mass. He graduated at the Harvard Medical School in 1829, and took time during the last two years of his course to make a mineralogical and geological survey of Nova Scotia in company with Francis Alger of Boston. An account of this expedition is contained in the Memoirs of the American Academy of Arts and Sciences. He went to Europe in and spent three years studying in Paris, varied by occasional trips to Germany and Italy. In 1833 he began the practice of medicine in Boston, but soon abandoned it to devote himself to chemistry, mineralogy, and geology. He was State geologist of Maine in 1336. of Rhode Island in 1339, and of New Hampshire in 1340. In 1837 he had a violent controversy with Morse, to whom he claimed to have given the idea of the telegraph. He ex plored the wilderness on the southern shore of lake Superior in 1844, and from 1847 till 1349 was United States surveyor of mineral lands in Michigan. He claimed to be the discoverer of
the anwsthetie properties of ether, and this in volved him in a dispute with Dr. W. T. G. Morton. His claim was supported by many Boston physicians, and a committee appointed by the French Academy of Sciences to investigate the matter decided that both men were entitled to recognition. Dr. Jackson published elaborate reports of his work as a State geologist. and as a member of the United States Geological Survey; contributed articles to the American Journal of Science and Arts, to the Compte.s Rendus, and to the Bulletin de la ,S'oci6te de France; and wrote a. of Etherization, with a History of Its Discovery (1863).