A noted American ethnologist, born in New York State; at 24 was geologist to an exploring expedition undertaken by General Cass to Lake Superior and the Upper Mississippi; married the educated daughter of an Ojibway chief; founded the Historical Society of Michigan and the Algic Society at Detroit; discovered the sources of the Mississippi in 1832; was an active and friendly agent for the Indians, and in 1847 began, under Government authorisation, his great work of gathering together all possible information regarding the Indian tribes of the United States, an invaluable work embodied in six great volumes; author also of many other works treating of Indian life, exploration, etc. (1793-1864).