Page:Joseph Story, Commentaries on the Constitution of the United States (1st ed, 1833, vol III).djvu/523

 CH. XXXVIII.] under that part of the constitution, which gives jurisdiction to the federal courts, in consequence of the character of the party, nor is he authorized to sue by the judiciary act. He comes into the courts of the Union under the authority of an act of congress, the constitutionality of which can only be sustained by the admission, that his suit is a case arising under a law of the United States. If it be said, that it is such a case, because a law of the United States authorizes the contract, and authorizes the suit, the same reasons exist with respect to a suit brought by the bank. That, too, is such a case; because that suit, too, is itself authorized, and is brought on a contract authorized by a law of the United States. It depends absolutely on that law, and cannot exist a moment without its authority.

§ 1648. If it be said, that a suit brought by the bank may depend in fact altogether on questions, unconnected with any law of the United States, it is equally true with respect to suits brought by the post-master general. The plea in bar may be payment, if the suit be brought on a bond, or non-assumpsit, if it be brought on an open account, and no other question may arise, than what respects the complete discharge of the demand. Yet the constitutionality of the act, authorizing the post-master general to sue in the courts of the United States, has never been drawn into question. It is sustained singly by an act of congress, standing on that construction of the constitution, which asserts the right of the legislature to give original jurisdiction to the circuit courts, in cases arising under a law of the United States. The clause in the patent law, authorizing suits in the circuit courts, stands, we