And it was still another Frenchman who first gave to the world an accurate description of the sources of the river. On his own account, Nicollet, sometime professor in the College Louis le Grand, set out in 1831 to explore the river from its mouth to the source. He spent five years in these regions which he described as "a grand empire possessing the grandest natural limits on the earth." He then returned to a little Catholic college in Baltimore as a teacher, but the United States Government, hearing of his valuable service, commissioned him to make another expedition that would enable him to complete his map of the region of the sources. What he then accomplished has given him "distinct and conspicuous place among the explorers of the Mississippi." His map shows myriad lakes in the region of the sources (where the slightest jar of earth might turn in other directions the water of these brimming bowls), so many indeed, that there would seem to be only lake and marsh and savannas. But we see him looking off toward plateaus "looming as if [they were] a distant shore." Another picture I shall always keep from his report is of his stolid half-breed guide (who usually waited for him and his companion with face toward them) sitting one day somewhat ahead of the party on a slight elevation, which makes the watershed between the rivers of the north and the rivers of the south, his face turned from them, gazing in silent rapture upon the boundless stretch of plains. How their magical influence possessed him, as well as that child of forest and plain, Nicollet, a peasant boy of Savoy, a professor in Paris, interrupts his topographical report to tell: "It is difficult to express by words the varied impressions which the spectacle of these prairies produces. Their sight never wearies. To look a prairie up or down, to ascend one of its undulations, to reach a small plateau (or, as the voyageurs call it, a prairie planche), moving from wave to wave over alternate swells and depressions and finally to reach the vast, interminable low prairie that extends itself in front--(be it for hours, days or weeks)--one never tires; pleasurable and exhilarating sensations are all the time felt; ennui is never experienced. Doubtless there are moments when excessive heat, a want of fresh water, and other privations remind one that life is a toil; but these drawbacks are of short duration. There are no concealed dangers--no difficulties of road; a far-spreading verdure, relieved by a profusion of variously colored flowers, the azure of the sky above, or the tempest that can be seen from its beginning to its end, the beautiful modifications of the changing clouds, the curious looming of objects between earth and sky, taxing the ingenuity every moment to rectify--all, everything, is calculated to excite the perceptions and keep alive the imagination. In the summer season, especially, everything upon the prairies is cheerful, graceful, and animated.