Governor Cass, and Colonel Menard of Illinois, have been appointed Commissioners to treat with the Sac, Fox, Winnebago, Ottawa, Pattawatamie, and Chippewa tribes of Indians, for the extinction of their title to the mining country upon Fever River, and also to a tract of land south of St. Joseph of Lake Michigan; and to another, to connect the settlements of Indiana. The season is so far advanced, that we learn it will be impracticable to hold the council this year for the lead country-it will be held next season. Some of the other objects of the commissioners will be effected this year. Det. Gaz.