At the close of an argument already too long drawn out, I shall not stop to array the considerations of reason and expediency in behalf of this jurisdiction; nor shall I dwell on the inevitable influence it must exercise over Slavery, which is the motive of the Rebellion. To my mind nothing can be clearer, as a proposition of Constitutional Law, than that everywhere within the exclusive jurisdiction of the National Government Slavery is impossible. The argument is as brief as it is unanswerable. Slavery is so odious that it can exist only by virtue of positive law, plain and unequivocal; but no such words can be found in the Constitution; therefore Slavery is impossible within the exclusive jurisdiction of the National Government. For many years I have had this conviction, and have constantly maintained it. I am glad to believe that it is implied, if not expressed, in the Chicago Platform. Mr. Chase, among our public men, is known to accept it sincerely. Thus Slavery in the Territories is unconstitutional; but if the Rebel territory falls under the exclusive jurisdiction of the National Government, then Slavery becomes impossible there. In a legal and constitutional sense, it must die at once. The air is too pure for a slave. I cannot doubt that this great triumph has been already won. The moment that the States fell, Slavery fell also; so that, even without any proclamation of the President, Slavery ceased to have legal and constitutional existence in every Rebel State. Even if we hesitate to accept this important conclusion, which treats Slavery within the Rebel States as already dead in law and Constitution, it cannot be doubted that by the extension of Congressional jurisdiction, as now proposed, many difficulties will be removed. Holding every acre of soil and every inhabitant within its jurisdiction, Congress can easily do whatever is needful within Rebel limits to assure freedom and save society. The soil may be divided among patriot soldiers, poor whites, and freedmen; but above all things the inhabitants may be saved from harm. Those citizens in the Rebel States who throughout the darkness of the Rebellion have kept their faith will be protected, and the freedmen rescued from hands that threaten to cast them back into Slavery.