BAKER, Marcus, explorer, born in Ostemo, Kalamazoo County, Mich., 23 September 1849. He was educated at Kalamazoo College and the University of Michigan, graduating in 1870; in 1870-'1 was made professor of mathematics in Albion College, and in 1871-'3 tutor of mathematics in the University of Michigan. In 1873 he became connected with the U.S. Coast and Geodetic Survey, attaining in 1886 the grade of assistant geographer. During this time he spent several years in explorations and surveys in Alaska, and traversed the entire Pacific coast from southern California to the Arctic ocean. From July 1882, to August 1884, he was in charge of the Los Angeles magnetic observatory, established by the United States signal service. He has devoted much time, with William H. Dall, to the compilation of material for a Coast Pilot of Alaska, and also to the "Alaska Coast Pilot, Appendix I., Meteorology and Bibliography" (Washington, 1879). Mr. Baker has contributed mathematical papers to the scientific journals, and has been one of the secretaries of the Philosophical society, Washington.