Schoolcraft left St. Marie on the 7th June, 1832, visited the tribes living about Lake Superior, and was soon on the St. Louis river. He was then 150 miles from the Mississippi, and was told that it would take him no less than ten days to reach the great river, on account of the rapids and shallows. On the 3rd July, the expedition reached the factory of a trader named Aitkin, on the banks of the river, and there celebrated on the following day the anniversary of the independence of the United States. Two days later Schoolcraft found himself opposite the Peckgama Falls, and encamped at Oak Point. Here the river winds a great deal amongst savannahs, but guides led the party by paths which greatly shortened the distance. Lake Winnipeg was then crossed, and on the 10th July, Schoolcraft arrived at Lake Cass, the furthest point reached by his predecessors. [Illustration: Map of the sources of the Mississippi, 1836.] A party of Chippeway Indians led the explorers to their settlement on an island in the river. The friendliness of the natives led Cass to leave part of his escort with them, and, accompanied by Lieutenant Allen, the surgeon Houghton, a missionary, and several Indians, he started in a canoe. Lakes Tasodiac and Crooked were visited in turn. A little beyond the latter, the Mississippi divides into two branches or forks. The guide took Schoolcraft up the eastern, and after crossing Lakes Marquette, La Salle, and Kubbakanna, he came to the mouth of the Naiwa, the chief tributary of this branch of the Mississippi. Finally, after passing the little lake called Usawa, the expedition reached Lake Itasca, whence issues the Itascan, or western branch of the Mississippi. Lake Itasca, or Deer Lake, as the French call it, is only seven or eight miles in extent, and is surrounded by hills clothed with dark pine woods. According to Schoolcraft it is some 1500 feet above the sea level; but we must not attach too much importance to this estimate, as the leader of the expedition had no instruments. On their way back to Lake Cass, the party followed the western branch, identifying its chief tributaries. Schoolcraft then studied the ways of the Indians frequenting these districts, and made treaties with them. To sum up, the aim of the government was achieved, and the Mississippi had been explored from its mouth to its source. The expedition had collected a vast number of interesting details on the manners, customs, history, and language of the people, as well as numerous new or little known species of flora and fauna. The people of the United States were not content with these official expeditions, and numbers of trappers threw themselves into the new districts. Most of them being however absolutely illiterate, they could not turn their discoveries to scientific account. But this was not the case with James Pattie, who has published an account of his romantic adventures and perilous trips in the district between New Mexico and New California.