Let me say, then, that the Whigs of Massachusetts are--I hope it is not my wish only that is father to the thought--the party which seeks the establishment of Truth, Freedom, Right, and Humanity, under the Constitution of the United States, and by the Union of the States. They are Unionists, Constitutionalists, Friends of the Right. The question here arises, How shall this party, inspired by these principles, now act? The answer is easy. In strict accordance with their principles. It must utter them with distinctness, and act upon them with energy. The party will naturally express opposition to the present Administration for its treacherous course on the tariff, and for its interference by veto with internal improvements; but it will be more alive to evils of greater magnitude,--the unjust and unchristian war with Mexico, which is not less absurd than wicked, and, beyond this, the institution of Slavery. The time, I believe, has gone by, when the question is asked, _What has the North to do with Slavery?_ It might almost be answered, that, politically, it has little to do with anything else,--so are all the acts of our Government connected, directly or indirectly, with this institution. Slavery is everywhere. Appealing to the Constitution, it enters the Halls of Congress, in the disproportionate representation of the Slave States. It holds its disgusting mart at Washington, in the shadow of the Capitol, under the legislative jurisdiction of the Nation,--of the North as well as the South. It sends its miserable victims over the high seas, from the ports of Virginia to the ports of Louisiana, beneath the protecting flag of the Republic. It presumes to follow into the Free States those fugitives who, filled with the inspiration of Freedom, seek our altars for safety; nay, more, with profane hands it seizes those who have never known the name of slave, freemen of the North, and dooms them to irremediable bondage. It insults and expels from its jurisdiction honored representatives of Massachusetts, seeking to secure for her colored citizens the peaceful safeguard of the Union. It assumes at pleasure to build up new slaveholding States, striving perpetually to widen its area, while professing to extend the area of Freedom. It has brought upon the country war with Mexico, with its enormous expenditures and more enormous guilt. By the spirit of union among its supporters, it controls the affairs of Government,--interferes with the cherished interests of the North, enforcing and then refusing protection to her manufactures,--makes and unmakes Presidents,--usurps to itself the larger portion of all offices of honor and profit, both in the army and navy, and also in the civil department,--and stamps upon our whole country the character,