Early in 1832, the plan of visiting the source of the Mississippi, was resumed. And a memoir for its execution, accompanied by estimates, forwarded to the Department of War, which received the sanction of the Hon. L. Cass, then placed at the head of that department. An expedition was accordingly organized, consisting of thirty persons, including an officer of the army, detached, with ten men, for topographical duty, a surgeon and geologist, an interpreter of the language, and a missionary to the north-western Indians, who was invited to accompany the exploring party. This expedition was based on a renewal of the effort to effect a permanent peace with the two principal Indian nations, who inhabit that region, and whose continued feuds, not only weaken and harass each other, but embarrass the trade, interrupt the execution of the intercourse laws, and involve the lives and property of the frontier inhabitants. Additional weight was given to these considerations, by the unquiet state of the Indians on the Upper Mississippi, which broke out in open hostility during the year. These reasons were connected with the supervision of the trade, the acquisition of statistical facts, and the carrying into effect an act of Congress of that year, for extending the benefits of vaccination to the Indian tribes. To which end it was enjoined “to proceed to the country on the heads of the Mississippi, and to visit as many Indians in that, and the intermediate region, as circumstances would permit.” This expedition, to the account of which the present volume is devoted, left St. Mary’s on the 7th of June, 1832. As the route through Lake Superior, and thence north-west, on the waters of the Upper Mississippi, to Cass Lake, has been described in a “Narrative Journal of Travels in the North-west,” of 1820, heretofore published by the author, no details of the geography of the country then passed over and described, or of the ordinary incidents of a journey through this portion of the country, will be given. A brief sketch, however, of the general route, will serve to refresh the memory of readers whose attention has been before called to the subject, and cannot but prove acceptable to all, who feel an interest in the development of its natural features and character. The village of the Sault of St. Mary’s is situated on the communication which connects Lake Huron with Lake Superior, fifteen miles below the foot of the latter. A strong and continued rapid, over shelving sand rock, interrupts the navigation for vessels. The water has been computed to sink its level, twenty two feet ten inches, at this place. A portage exceeding half a mile, enables boats to proceed beyond. The river above has a brisk current, which is imperceptibly lost on entering between the two prominent capes, which form the opening into Lake Superior.