New-England will not be alone in manufacturing, nor Pennsylvania in mining. We think that Mr. Trollope fails to appreciate principle when he likens the conflict between the two sections of our country to a quarrel between Mr. and Mrs. Jones, in which a mutual friend (England) is, from the very nature of the case, obliged to maintain neutrality, leaving the matter to the tender care of Sir Creswell. There never yet existed a mutual friend who, however little he interfered with a matrimonial difference, did not, in sympathy and moral support, take violent sides with _one_ of the combatants; and Mr. Trollope would be first in taking up the cudgels against private wrong. The North has never wished for physical aid from England; but does Mr. Trollope remember what Mrs. Browning has so nobly and humanely written? 'Non-intervention in the affairs of neighboring States is a high political virtue; but non-intervention does not mean passing by on the other side when your neighbor falls among thieves, or Phariseeism would recover it from Christianity.' England, the greatest of actual nations, had a part to act in our war, and that part a noble one. Not the part of physical intervention for the benefit of Lancashire and of a confederacy founded upon slavery, which both Earl Russell and Lord Palmerston inform the world will not take place 'at present.' Not the part of hypercriticism and misconstruction of Northern 'Orders,' and affectionate blindness to Southern atrocities. But such a part as was worthy of the nation, one of whose greatest glories is that it gave birth to a Clarkson, a Sharpe, and a Wilberforce. And England has much to answer for, in that she has been found wanting, not in the cause of the North, but in the cause of humanity. Had she not always told us that we were criminals of the deepest dye not to do what she had done in the West-Indies, had she not always held out to the world the beacon-light of emancipation, there could be little censure cast upon the British ermine; but having laid claim to so white and moral a robe, she subjects herself to the very proper indignation of the anti-slavery party which now governs the North.