Had Mr. Clay lived to see, as we have seen, the union of his beloved country rent asunder at the centre, and hostile armies composed of his beloved countrymen on the field of battle, amid dust, smoke, and fire, blowing each other to pieces from the cannon’s mouth; had he seen five hundred thousand of the youth and flower of both sections of this land cut down by the sword and flung down into bloody graves; had he seen in the wake of this fratricidal war the smoldering ruins of noble towns and cities, and the nation staggering under a debt heavier than a mountain of gold; had he seen the sullen discontent and deadly hate which survived the war, and traced all these calamities and more, as he must do, to the existence of slavery, he would, in all the bitterness of his soul, have cursed the day when he poured out his eloquence in defence of that system which brought upon his country these accumulated horrors. The lesson of this national experience is in place to-day, and it would be well for this nation to study and learn it. Look abroad! What rocks Europe to-day? What causes the Emperor of all the Russias to be uneasy on his pillow? What makes Austria tremble? Why does England start up frantically at midnight and search her premises? You know, and I know, that these countries have aggrieved classes among them who have just ground of complaint against their governments. Now, fellow-citizens, let me speak plainly. This is an age when men go to and fro in the earth, and knowledge increases oppressed peoples all over the world are protesting with earthquake emphasis against all forms of injustice, some by one means and some by another. Examples, like certain diseases, are contagious. Railroads, steam navigation, electric wires, newspapers, and traveling emissaries are abroad. Can you be quite sure that the oppressed laborers in this country, white and colored, will not some day make common cause and learn some of the dangerous modes of protest against injustice adopted in other countries? I deal in no threats, for myself or for any of my countrymen, and am only for peaceful methods; but I say to all oppressors, “Have a care how you goad and imbrute the colored man of the South!” He is weak, but not powerless. He is submissive to wrongs, but not insensible to his rights. He is hopeful, but not incapable of despair. He can endure, but even to him may come a time when he shall think endurance has ceased to be a virtue. All the world is a school, and in it one lesson is just now being taught in letters of fire and blood, and that is, the utter insecurity of life and property in the presence of an aggrieved class. This lesson can be learned by the ignorant as well as by the wise. Who can blame the negro if, when he is driven from the ballot-box, the jury-box, and the schoolhouse, denied equal rights on railroads and steamboats, called out of his bed at midnight and whipped by regulators,