Beecher, commenced a discussion of the subject of Slavery, about fifteen young men from the South, all of them slave-holders or sons of slave-holders, were not a little incensed at the faithful exposure of Slavery by their fellow-students; but at the close of the discussion, all these young men, save one, were thorough going Abolitionists; and several of them are now lecturing in the free states for the purpose of correcting our public sentiment, as a necessary and infallible means of rectifying that of the South. We believe, therefore, that if we succeed in abolitionizing the North, we shall the South. Were the North already abolitionized, we should do all the good specified above. We should preserve our own liberties, virtue and religion, and save the South from man’s greatest curse, his own voluntary wickedness. Is it not, then, desirable that our sentiments should prevail? Do they not carry with them the clearest credentials of truth—the very best practical tendencies? Is it not the grossest hypocrisy in the North to pretend hostility to Slavery, when she refuses to do the good which she would rejoice to do, were she a convert to abolitionism? Is it not a crime in her to fight against the diffusion of these sentiments? In one word—ought not the Abolitionists to do all they can, in a constitutional and christian manner, to propagate their views? Success at the North is certain; for she has an interest in destroying Slavery: her political principles are opposed to it; and the great mass of her citizens are intelligent and virtuous, unbought by southern patronage, and accustomed to abhor cruelty and injustice. Our success is also written in the desperate, but ineffectual endeavors of the opposition, to prevent the agitation of the subject. By their own showing, Slavery cannot endure the light of free inquiry. If northern abettors of Slavery were not convinced, that the discussion will inevitably abolitionize the mass of the people, they would rely on argument rather than on lawless violence. Our progress too, has already been astonishing. In the course of three years nearly a thousand Anti-Slavery Societies have been organized; many enemies have become friends, and many opposers, the able advocates of our cause. The prejudices of the people have been softened, and thousands are now on the eve of joining us, who lately were our most bitter antagonists. We have made all this progress notwithstanding the abuse of the political and commercial press has been heaped upon us without measure, and no man could join us but at the peril of his reputation, if not also his life and property. We are, therefore, encouraged to persevere. What have we to accomplish, which we have not in part achieved, while our powers and facilities are constantly augmenting. VINDICATION OF MEASURES.