Mr. THOMAS, from the committee appointed on the thirteenth instant, to inquire into the expediency of dividing the Indiana Territory, made a report thereon; which was read, and committed to a Committee of the Whole on Monday next. The report is as follows: That, by the fifth article of the ordinance of Congress for the government of the Territory of the United States Northwest of the river Ohio, it is stipulated that there shall be formed in the said Territory no less than three, nor more than five States; and the boundaries of the States, as soon as Virginia shall alter her act of cession, and consent to the same, shall become fixed and established, as follows: The Western State shall be bounded by the Mississippi, the Ohio, and Wabash rivers; a direct line drawn from the Wabash and Post Vincennes, due north, to the Territorial line between the United States and Canada, and by the said Territorial line to the Lake of the Woods and Mississippi. The middle State shall be bounded by the said direct line, the Wabash, from Post Vincennes to the Ohio; by the Ohio, by a direct line drawn due north from the mouth of the Great Miami, to the said Territorial line, and by the said Territorial line. The Eastern State shall be bounded by the last-mentioned direct line, the Ohio, Pennsylvania, and the said Territorial line: _Provided, however_, and it is further understood and declared, that the boundaries of these three States shall be subject so far to be altered, that if Congress shall hereafter find it expedient, they shall have authority to form one or two States in that part of the said Territory which lies north of an east and west line drawn through the southerly bend or extreme of Lake Michigan. And whenever any of the said States shall have sixty thousand free inhabitants therein, such State shall be admitted by its delegates into the Congress of the United States on an equal footing with the original States, in all respects whatever, and shall be at liberty to form a permanent constitution and State Government: _Provided_, the constitution and government so to be formed shall be republican, and in conformity to the principles contained in these articles; and, so far as it can be consistent with the general interest of the Confederacy, such admission shall be allowed at an earlier period, and when there shall be a less number of free inhabitants in the State than sixty thousand.