“The splendid oration which he delivered at New York on the 10th inst., though full of a strange injustice towards ourselves, ought not to lessen our love for the man, and will increase our admiration of the orator and philanthropist; but, if there was any idea that Mr. Sumner could reason clearly as well as feel rightly and speak eloquently, that idea will be dissipated. All the multitude of eloquent and burning words which he pours forth against Slavery will here find ready echo; and even when he enters on accusations against this country, as having ‘intermeddled on the side of Slavery,’ it will be felt that he speaks in the spirit, not of a mean and jealous enemy, but of a high-minded, though mistaken friend. But no non-American man can fail to perceive that there is a grand mistake lying at the root of all the complaints he makes against us: he would have Great Britain in her national capacity to deal with American affairs according to moral sentiments as distinguished from political rules, and he condemns her for doing what he did himself and is doing still.… He tries, indeed, to make a difference between the hypothetical Confederate States and all other Slave States, including the late United States. They will, he says, form a ‘_new_’ Slave Power. He forgets, that, though the Power may be new, the Slavery will be old.” The Manchester _Guardian_ said:--