The national debt, as it was ascertained on the 1st of October last, amounted in the whole to the sum of $120,000,000, consisting of the unredeemed balance of the debt contracted before the late war ($39,000,000), the amount of the funded debt contracted in consequence of the war ($64,000,000), and the amount of the unfunded and floating debt, including the various issues of Treasury notes, $17,000,000, which is in a gradual course of payment. There will probably be some addition to the public debt upon the liquidation of various claims which are depending, and a conciliatory disposition on the part of Congress may lead honorably and advantageously to an equitable arrangement of the militia expenses incurred by the several States without the previous sanction or authority of the Government of the United States; but when it is considered that the new as well as the old portion of the debt has been contracted in the assertion of the national rights and independence, and when it is recollected that the public expenditures, not being exclusively bestowed upon subjects of a transient nature, will long be visible in the number and equipments of the American Navy, in the military works for the defense of our harbors and our frontiers, and in the supplies of our arsenals and magazines the amount will bear a gratifying comparison with the objects which have been attained, as well as with the resources of the country. The arrangements of the finances with a view to the receipts and expenditures of a permanent peace establishment will necessarily enter into the deliberations of Congress during the present session. It is true that the improved condition of the public revenue will not only afford the means of maintaining the faith of the Government with its creditors inviolate, and of prosecuting successfully the measures of the most liberal policy, but will also justify an immediate alleviation of the burdens imposed by the necessities of the war. It is, however, essential to every modification of the finances that the benefits of an uniform national currency should be restored to the community. The absence of the precious metals will, it is believed, be a temporary evil, but until they can again be rendered the general medium of exchange it devolves on the wisdom of Congress to provide a substitute which shall equally engage the confidence and accommodate the wants of the citizens throughout the Union. If the operation of the State banks can not produce this result, the probable operation of a national bank will merit consideration; and if neither of these expedients be deemed effectual it may become necessary to ascertain the terms upon which the notes of the Government (no longer required as an instrument of credit) shall be issued upon motives of general policy as a common medium of circulation.