By the last returns to the Department of War the militia force of the several States may be estimated at 800,000 men--infantry, artillery, and cavalry. Great part of this force is armed, and measures are taken to arm the whole. An improvement in the organization and discipline of the militia is one of the great objects which claims the unremitted attention of Congress. The regular force amounts nearly to the number required by law, and is stationed along the Atlantic and inland frontiers. Of the naval force it has been necessary to maintain strong squadrons in the Mediterranean and in the Gulf of Mexico. From several of the Indian tribes inhabiting the country bordering on Lake Erie purchases have been made of lands on conditions very favorable to the United States, and, as it is presumed, not less so to the tribes themselves. By these purchases the Indian title, with moderate reservations, has been extinguished to the whole of the land within the limits of the State of Ohio, and to a part of that in the Michigan Territory and of the State of Indiana. From the Cherokee tribe a tract has been purchased in the State of Georgia and an arrangement made by which, in exchange for lands beyond the Mississippi, a great part, if not the whole, of the land belonging to that tribe eastward of that river in the States of North Carolina, Georgia, and Tennessee, and in the Alabama Territory will soon be acquired. By these acquisitions, and others that may reasonably be expected soon to follow, we shall be enabled to extend our settlements from the inhabited parts of the State of Ohio along Lake Erie into the Michigan Territory, and to connect our settlements by degrees through the State of Indiana and the Illinois Territory to that of Missouri. A similar and equally advantageous effect will soon be produced to the south, through the whole extent of the States and territory which border on the waters emptying into the Mississippi and the Mobile. In this progress, which the rights of nature demand and nothing can prevent, marking a growth rapid and gigantic, it is our duty to make new efforts for the preservation, improvement, and civilization of the native inhabitants. The hunter state can exist only in the vast uncultivated desert. It yields to the more dense and compact form and greater force of civilized population; and of right it ought to yield, for the earth was given to mankind to support the greatest number of which it is capable, and no tribe or people have a right to withhold from the wants of others more than is necessary for their own support and comfort.