DeWitt Clinton, the father of the great system of internal improvements in the State of New York, speaking of despotism in Europe, and of slavery in America, asks:-- "Have not prescription and precedent--patriarchal dominion--divine right of kings and masters, been alternately called in to sanction the slavery of nations? And would not all the despotisms of the ancient and modern world have vanished into air, if the natural equality of mankind had been properly understood and practiced? * * * This declares that the same measure of justice ought to be measured out to all men, without regard to adventitious inequalities, and the intellectual and physical disparities which proceed from inexplicable causes." THE VOICE OF WARREN. Major General Joseph Warren, one of the truest patriots of the Revolution, and the first American officer of rank that fell in our contest with Great Britain, says:-- "That personal freedom is the natural right of every man, and that property, or an exclusive right to dispose of what he has honestly acquired by his own labor, necessarily arises therefrom, are truths that common sense has placed beyond the reach of contradiction. And no man, or body of men, can, without being guilty of flagrant injustice, claim a right to dispose of the persons or acquisitions of any other man or body of men, unless it can be proved that such a right has arisen from some compact between the parties, in which it has been explicitly and freely granted." Otis, Hancock, Ames, and others, should be heard, but for the want of space. Volumes upon volumes might be filled with extracts similar to the above, from the works of the deceased Statesmen and sages of the North, who, while living, proved themselves equal to the task of exterminating from their own States the matchless curse of human slavery. Such are the men who, though no longer with us in the flesh, "still live." A living principle--an immortal interest--have they, invested in every great and good work that distinguishes the free States. The railroads, the canals, the telegraphs, the factories, the fleets of merchant vessels, the magnificent cities, the scientific modes of agriculture, the unrivaled institutions of learning, and other striking evidences of progress and improvement at the North, are, either directly or indirectly, the offspring of their gigantic intellects. When, if ever, commerce, and manufactures, and agriculture, and great enterprises, and truth, and liberty, and justice, and magnanimity, shall have become obsolete terms, then their names may possibly be forgotten, but not tell then.