I say the law of Missouri, because a judicial tribunal, in one State or nation, can recognise personal rights acquired by force of the law of any other State or nation, only so far as it is the law of the former State that those rights should be recognised. But, in the absence of positive law to the contrary, the will of every civilized State must be presumed to be to allow such effect to foreign laws as is in accordance with the settled rules of international law. And legal tribunals are bound to act on this presumption. It may be assumed that the motive of the State in allowing such operation to foreign laws is what has been termed comity. But, as has justly been said, (per Chief Justice Taney, 13 Pet., 589,) it is the comity of the State, not of the court. The judges have nothing to do with the motive of the State. Their duty is simply to ascertain and give effect to its will. And when it is found by them that its will to depart from a rule of international law has not been manifested by the State, they are bound to assume that its will is to give effect to it. Undoubtedly, every sovereign State may refuse to recognise a change, wrought by the law of a foreign State, on the _status_ of a person, while within such foreign State, even in cases where the rules of international law require that recognition. Its will to refuse such recognition may be manifested by what we term statute law, or by the customary law of the State. It is within the province of its judicial tribunals to inquire and adjudge whether it appears, from the statute or customary law of the State, to be the will of the State to refuse to recognise such changes of _status_ by force of foreign law, as the rules of the law of nations require to be recognised. But, in my opinion, it is not within the province of any judicial tribunal to refuse such recognition from any political considerations, or any view it may take of the exterior political relations between the State and one or more foreign States, or any impressions it may have that a change of foreign opinion and action on the subject of slavery may afford a reason why the State should change its own action. To understand and give just effect to such considerations, and to change the action of the State in consequence of them, are functions of diplomatists and legislators, not of judges. The inquiry to be made on this part of the case is, therefore, whether the State of Missouri has, by its statute, or its customary law, manifested its will to displace any rule of international law, applicable to a change of the _status_ of a slave, by foreign law. I have not heard it suggested that there was any statute of the State of Missouri bearing on this question. The customary law of Missouri is the common law, introduced by statute in 1816. (1 Ter. Laws, 436.) And the common law, as Blackstone says, (4 Com., 67,) adopts, in its full extent, the law of nations, and holds it to be a part of the law of the land.