From the foregoing views, it is plain, that only in a certain sense can slavery be pronounced the cause of the rebellion. It was not the first and original motive; neither is it the sole end of the conspirators. But in another sense, it may justly be considered the cause of the war; for without it, the war could never have taken place. There was no actual necessity to destroy the Union for the protection of slavery and for its continued existence. Construed in any rational sense likely to be adopted, the Constitution afforded ample security--far more, indeed, than could be found under a separate confederacy. This was evident to the leaders of the rebellion, though it was their policy to conceal the truth from the people, by the fierce passions artfully aroused in the beginning. Slavery could not have been perpetuated, because its permanence is against the decrees of nature. But it could have lived out a peaceful and perhaps a prosperous existence, gradually disappearing without convulsion or bloodshed. Discussion and agitation could not have been prevented, nor could the inevitable end have been averted. Yet the whole movement could well have been controlled and directed, by the adoption of wise and well-considered measures, not inconsistent with the natural laws governing the case, whose final operation it was wholly impossible to prevent. But this system of gradual amelioration, and peaceful development of ends that must come, did not satisfy the ambition of the conspirators. They saw their last opportunity for a successful rebellion, and they determined not to let it pass unimproved. The vast power of the slave interest; the passions easily to be excited by it; the encouraging delusions clustering around it; and the fearful apprehensions growing out of its darker aspects, all contributed to make it the very instrument for accomplishing the long-cherished design. Slavery has been the chief means of bringing about the rebellion. It is the lever, resting upon the fulcrum of State sovereignty, by which the conspirators have been able, temporarily, to force one section of the Union from its legitimate connections. Thus used for this unhallowed purpose, and become tainted with treason and crimsoned with the blood of slaughtered citizens, slavery necessarily subjects itself to all the fearful contingencies and responsibilities of the rebellion. Whether the confederate cause shall succeed or fail, the slave institution, thus fatally involved in it, cannot long survive. In either event, its doom is fixed. Like one of those reptiles, which, in the supreme act of hostility, extinguish their own lives inflicting a mortal wound upon their victims, slavery, roused to the final paroxysm of its hate and rage, injects all its venom into the veins of the Union, exhausts itself in the effort, and inevitably dies. WORD-MURDER.