While on the subject of the source of the Mississippi river, I may as well speak of the elevations of the state above the level of the sea. It can be truthfully said that Minnesota occupies the summit of the North American continent. In its most northern third rises the Mississippi, which, in its general course, flows due south to the Gulf of Mexico. In about its center division, from north to south, rises the Red River of the North, and takes a general northerly direction until it empties into Lake Winnipeg, while the St. Louis and other rivers take their rise in the same region and flow eastwardly into Lake Superior, which is the real source of the St. Lawrence, which empties into the Atlantic. The elevation at the source of the Mississippi is 1,600 feet, and at the point where it leaves the southern boundary of the state, 620 feet. The elevation at the source of the Red River of the North is the same as that of the Mississippi, 1,600 feet, and where it leaves the state at its northern boundary 767 feet. The average elevation of the state is given at 1,275 feet, its highest elevation, in the Mesaba range, 2,200 feet, and its lowest, at Duluth, 602 feet. NICOLLET. In 1836 a French savant, M. Jean N. Nicollet, visited Minnesota for the purpose of exploration. He was an astronomer of note, and had received a decoration of the Legion of Honor, and had also been attached as professor to the Royal College of "Louis Le Grande." He arrived in Minnesota on July 26, 1836, bearing letters of introduction, and visited Fort Snelling, whence he left with a French trader, named Fronchet, to explore the sources of the Mississippi. He entered the Crow Wing river, and by the way of Gull river and Gull lake he entered Leech lake. The Indians were disappointed when they found he had no presents for them and spent most of his time looking at the heavens through a tube, and they became unruly and troublesome. The Rev. Mr. Boutwell, whose mission house was on the lake, learning of the difficulty, came to the rescue, and a very warm friendship sprang up between the men. No educated man who has not experienced the desolation of having been shut up among savages and rough, unlettered voyageurs for a long time can appreciate the pleasure of meeting a cultured and refined gentleman so unexpectedly as Mr. Boutwell encountered Nicollet, and especially when he was able to render him valuable aid. From Leech lake Nicollet went to Lake Itasca with guides and packers. He pitched his tent on Schoolcraft island in the lake, where he occupied himself for some time in making astronomical observations. He continued his explorations beyond those of Schoolcraft and Lieutenant Allen, and followed up the rivulets that entered the lake, thoroughly exploring its basin or watershed.