By another act, America has consummated the long-delayed treaty with Great Britain for the suppression of the slave-trade. In ports whence slave-vessels formerly sailed with the connivance of the port-officers, the Administration has placed men who stand up to their duty, and for the first time in our history the slave-trader is convicted and hung as a pirate. This abominable secret traffic has been wholly demolished by the energy of the Federal Government. Lastly, and more significant still, the United States Government has in its highest official capacity taken distinct anti-slavery ground, and presented to the country a plan of peaceable emancipation with suitable compensation. This noble-spirited and generous offer has been urged on the Slaveholding States by the Chief Executive with an earnestness and sincerity of which history in after-times will make honourable account in recording the events of Mr. Lincoln’s administration. Now, when a President and Administration who have done all these things declare their intention of restoring “_the Union as it was_,” ought not the world fairly to interpret their words by their actions and their avowed principles? Is it not _necessary_ to infer that they mean by it the Union as it was in the intent of its anti-slavery framers, under which, by the exercise of normal Constitutional powers, slavery should be peaceably abolished? We are aware that this theory of the Constitution has been disputed by certain Abolitionists; but it is conceded, as you have seen, by the Secessionists. Whether it be a just theory or not is, however, nothing to our purpose at present. We only assert that such is the professed belief of the present Administration of the United States, and such are the acts by which they have illustrated their belief. But this is but half the story of the anti-slavery triumphs of this year. We have shown you what has been done for freedom by the simple use of the ordinary Constitutional forces of the Union. We are now to show you what has been done to the same end by the Constitutional war-power of the nation. By this power it has been this year decreed that every slave of a rebel who reaches the lines of our army becomes a free man; that all slaves found deserted by their masters become free men; that every slave employed in any service for the United States thereby obtains his liberty; and that every slave employed against the United States in any capacity obtains his liberty: and lest the army should contain officers disposed to remand slaves to their masters, the power of judging and delivering up slaves is denied to army-officers, and all such acts are made penal.