A few evenings since Fred Douglas spokc at Roohester on the crisis. He coneluded his nddreas by deciaring that tho only settlemont wliicli oan be made of our troubles will be by the destruction of the cause whioh has produeed the difficulty - slavery. Truc, tho government seema not to be doing anything to bring about this result directly ; but things are working. If the government is not ycton tho sido oí' the oppressed, events migbtier thau the governmcut aro bringing about that result. He had been asked : " What are you colored mea goiug to do ?" Ho answered, let a few colored regiments go down South and assist in setting their brothers free, and they could and would do this work effeetively for our government. He was veady to go; but this did uot imply much courage, for he kaew he would not be aecepted. The South aro wiser tu their generation than tho North. Black people are being made soldicrs cf at Montgomery. They piled tho sandbags and raised the batteries which drnve Major Audorson from Sumpter; but you Northerners are too aristocratie to marón by the side oí' a " nigger." But tho time may yet come when the President shall proclaim liberty through all the land. - The speaker argued that the eonstitution granted this power to Congrese That great statesman, John Quincey xVdams, oiice told the chivalry to their faees that the power to set slaves at liberty was olearly implied in tho war-making power There can be no peace or uuity iu this country while slavery exists.