Board to the Minnesota Sioux were maintained until that nation was removed to the Missouri in 1863. The results were sufficient to encourage persistence, in hope of future success, but the great body of the Indians was not affected. For a time this was due to suspicion on the part of the Indians of the sincerity of the missionaries. They could understand the soldier and the trader, but the missionary was a puzzle. He had nothing to sell, he asked no pay for teaching the children, caring for the sick, or preaching the word. Why he should teach a religion of brotherhood, and still keep to himself his household stuff, his little store of food, and his domestic animals, was beyond the comprehension of savages accustomed to communistic life. A greater obstacle lay in the fact that the missionary had first to break down faith in an ancient religion, and the dominance of a body of medicine-men who maintained their cult by a ceremonial interwoven with the whole life and habits of the people. Not less obstructive was the example of most white men known to the Indians,—greedy, dissolute, and licentious. CHAPTER V EXPLORATIONS AND SETTLEMENTS To discover the true source of any of the great rivers of the world, that is, that one of all sources which measured along the axis of its channel is farthest from its mouth, has ever been an alluring problem to the exploring geographer. David Thompson, geographer of the Northwest Company, in the course of a journey of exploration lasting a year and extending to the Missouri River, on April 23, 1798, reached Turtle Lake, four miles north of Lake Bemidji, and believed himself the discoverer of the true source of the Mississippi. Lieutenant Pike was confident that when on the 12th day of February, 1806, he reached the upper Red Cedar (Cass) Lake he was at the “upper source of the Mississippi.” These claims were either not known or not trusted, and a series of expeditions to reach the “true source” of the Mississippi was begun, soon after the military occupation in 1819. Lewis Cass, known best in American history by his national employments as senator, cabinet officer, and foreign minister, had cut such a figure as colonel of an Ohio regiment and brigadier-general in the War of 1812 that the President made him governor of the Territory of Michigan; an office which he held for seventeen years. That territory in 1819 was extended to the Mississippi River. Its governor was naturally curious to see something of this immense addition to his jurisdiction and the great river forming its western bound. He sought and obtained leave to conduct an expedition. An engineer officer, Captain Douglass, was ordered to join it, and Governor Cass employed Henry R. Schoolcraft, of whom we are to hear later, as mineralogist at one dollar and a half a day. Leaving Detroit late in May, 1820, with ten Indians and seven soldiers, in three birch-bark canoes, Cass was at the American Fur