"African slavery," he tells us, "cannot exist there." It could once exist in Massachusetts and New Hampshire. Very little of this territory lies north of Mason and Dixon's line, the northern limit of Maryland; none above the parallel of forty-two degrees; none of it extends fifty miles above the northern limit of Virginia; two hundred and four thousand three hundred and fifty-three square miles of it lie south of the line of the Missouri Compromise, south of 36° 30´. Almost all of it is in the latitude of Virginia and the Carolinas. If slavery can exist on the west coast of the Atlantic, I see not why it cannot on the east of the Pacific, and all the way between. There is no reason why it cannot. It will, unless we forbid it by positive laws, laws which no man can misunderstand. Why, in 1787, it was thought necessary to forbid slavery in the Northwest Territory, which extends from the Ohio River to the forty-ninth parallel of north latitude. Not exclude slavery from California and New Mexico, because it can never exist there! Why, it was there once, and Mexico abolished it by positive law. Abolished, did I say! We are not so sure of that; I mean, not sure that the Senate of the United States is sure of it. Not a month before Mr. Webster made this very speech, on the 13th and 14th of last February, Mr. Davis, the Senator from Mississippi, maintained that slavery is not abolished in California and New Mexico. He denies that the acts abolishing slavery in Mexico were made by competent powers; denies that they have the force of law. But even if they have, he tells us, "Suppose it be conceded that by law it was abolished--could that law be perpetual? Could it extend to the territory after it became the property of the United States? Did we admit territory from Mexico, subject to the Constitution and laws of Mexico? Did we pay fifteen million dollars for jurisdiction over California and New Mexico, that it might be held subordinate to the laws of Mexico?" The Commissioners of Mexico, he tells us, did not think that "we were to be bound by the edicts and statutes of Mexico." They pressed this point in the negotiation, "the continuation of their law for the exclusion of slavery;" and Mr. Trist told them he could not make a treaty on that condition; if they would "offer him the land covered a foot thick with pure gold, upon the single condition that slavery should be excluded therefrom, I could not entertain the offer for a moment." Does not Mr. Webster know this? He knows it too well.