It must be borne in mind that in this case there is no ground for the inquiry, whether it be the will of the State of Missouri not to recognise the validity of the marriage of a fugitive slave, who escapes into a State or country where slavery is not allowed, and there contracts a marriage; or the validity of such a marriage, where the master, being a citizen of the State of Missouri, voluntarily goes with his slave, _in itinere_, into a State or country which does not permit slavery to exist, and the slave there contracts marriage without the consent of his master; for in this case, it is agreed, Dr. Emerson did consent; and no further question can arise concerning his rights, so far as their assertion is inconsistent with the validity of the marriage. Nor do I know of any ground for the assertion that this marriage was in fraud of any law of Missouri. It has been held by this court, that a bequest of property by a master to his slave, by necessary implication entitles the slave to his freedom; because, only as a freeman could he take and hold the bequest. (Legrand _v._ Darnall, 2 Pet. R., 664.) It has also been held, that when a master goes with his slave to reside for an indefinite period in a State where slavery is not tolerated, this operates as an act of manumission; because it is sufficiently expressive of the consent of the master that the slave should be free. (2 Marshall's Ken. R., 470; 14 Martin's Louis. R., 401.) What, then, shall we say of the consent of the master, that the slave may contract a lawful marriage, attended with all the civil rights and duties which belong to that relation; that he may enter into a relation which none but a free man can assume--a relation which involves not only the rights and duties of the slave, but those of the other party to the contract, and of their descendants to the remotest generation? In my judgment, there can be no more effectual abandonment of the legal rights of a master over his slave, than by the consent of the master that the slave should enter into a contract of marriage, in a free State, attended by all the civil rights and obligations which belong to that condition. And any claim by Dr. Emerson, or any one claiming under him, the effect of which is to deny the validity of this marriage, and the lawful paternity of the children born from it, wherever asserted, is, in my judgment, a claim inconsistent with good faith and sound reason, as well as with the rules of international law. And I go further: in my opinion, a law of the State of Missouri, which should thus annul a marriage, lawfully contracted by these parties while resident in Wisconsin, not in fraud of any law of Missouri, or of any right of Dr. Emerson, who consented thereto, would be a law impairing the obligation of a contract, and within the prohibition of the Constitution of the United States. (See 4 Wheat., 629, 695, 696.)