where the subjects to which it applies are within her juris-, diction.”
We perceive no reason to modify the principles 'announced in these cases or to question their soundness. They are fundamentál and vital in the relations which, under the Constitution-, exist between the United States and the several States. Upon their strict observance depends, in no small degree, the harmonious and successful working of our complex system of government, Federal and State. It may, therefore, be regarded as the established doctrine of this court, that so long as the State, by its laws, prescribing the mode and subjects of taxation, does not entrench upon the legitimate authority of the Union, or violate any right recognized, or secured, by the Constitution of, the United States, this court, as between the State and its citizen, can afford him no relief against State taxation, however unjust, oppressive, or onerous.
Plainly, therefore,- our only duty is to. inquire whether the Constitution prohibits' á State from taxing, in the hands of one' of its resident citizens, a debt held by him upon a resident of another State, and evidenced by the bond of the debtor, secured by deed of trust or mortgage upon real estate situated in the State in which the debtor- resides.
The question does not seem to us to be very difficult of solution. The creditor, it is conceded, is a permanent resident within the jurisdiction of the State imposing the tax. The debt is property in his hands constituting a portion of his wealth, from which he is under the highest obligation, in common with his fellow-citizens of the same State, to contribute for the support of' the government whose protection he enjoys.
That debt, although a species of intangible property, may, for purposes'of taxation, if not for all others, be regarded as situated at the domicile of the creditor. It is none the less property because its amount and maturity are set forth in a bond. That bond, wherever actually held or deposited, is only evidence of the debt, and if destroyed, the debt — the right to demand payment of the money loaned, with the stipulated interest — remains. Nor is the debt, for the purposes of taxation, affected by the fact that .it is secured by mortgage