The importance of this site, in a military point of view, has not escaped the observation of Mr. Calhoun, and it was for this purpose that a treaty was directed to be held. The report which he made to the House of Representatives, in January last, contains his views upon the subject. We cannot but hope that no reduction will be made in the ranks of the army. It is by physical force alone, and by a proper display of it, that we must expect to keep within reasonable bounds, the ardent, restless, and discontented savages, by whom this whole country is filled and surrounded. Few persons living at a distance are aware of the means which are used, and too successfully used, by the British agents, to imbitter the minds of the Indians, and preserve such an influence over them as will insure their co-operation in the event of any future difficulties. A post at the Fond du Lac will, before long, be necessary, and it is now proper that one should be established at the portage between the Fox and Ouisconsin Rivers. Mr. Schoolcraft has examined the geological structure of the country, and has explored, as far as practicable, its mineralogical treasures. We are happy to learn that this department could not have been confided to one more able or zealous to effect the objects connected with it. Extensive collections, illustrating the natural history of the country, have been made, and will add to the common stock of American science. We understand that copper, iron, and lead are very abundant through the whole country, and that the great mass of copper upon the Outanagon River has been fully examined. Upon this, as well as upon other subjects, we hope we shall, in a few days, be able to communicate more detailed information. DISCOVERY OF THE ACTUAL SOURCE OF THE MISSISSIPPI RIVER IN ITASCA LAKE, BY AN EXPEDITION, AUTHORIZED BY THE WAR DEPARTMENT OF THE UNITED STATES, IN 1832. BY HENRY R. SCHOOLCRAFT, UNITED STATES SUPERINTENDENT OF INDIAN AFFAIRS FOR MICHIGAN, ETC. CHAPTER XXI. The search for the veritable source of the Mississippi is resumed.--Ascent to Cass Lake, the prior point of discovery--Pursue the river westerly, through the Andrúsian Lakes and up the Metoswa Rapids, forty-five miles--Queen Anne's Lake.