But I insist upon it that _Congress had no power to pass this 9th section of the Act of 1790_; that the construction put upon it by our opponents is entirely unwarranted; and that it cannot be applied to a case like this. Your honors are aware that in _The case of Smith, 5 Wheaton_, Mr. Webster took the ground that the law was not constitutional, because it did not define piracy otherwise than by referring to the law of nations. The authority given to Congress on that subject is to define and punish piracy and other offences against the law of nations. "To define and punish piracy" is all of the phrase with which I have to deal. Now, you understand, gentlemen, that there is no common-law jurisdiction of offences residing in the United States Courts. They can punish no crime except by statute. Congress had fully defined piracy and robbery in the _eighth_ section of the Act of 1790; and, having done so, what power or authority was there in Congress to go on and say that something else should be called piracy, when the definition of it was complete? Let me refer your honors again to the language of the law, which furnishes a strong argument on this subject: "If any citizen shall commit any piracy or robbery _aforesaid_, or any act of hostility against the United States," &c. Does not that clearly recognize and admit that piracy has been defined? and can it be pretended that Congress, under pretence of defining piracy, can provide that a common assault and battery on the high sea shall be piracy? Is there no limitation to that grant? We claim that its terms are just as much a _restriction_ as a _delegation_ of power. It defines as clearly the limits which the Government shall not transcend, as it does the area which Congress may occupy. You may "define piracy and punish it:" does this mean that you can call anything piracy, whether it be so or not? Suppose Congress passed an Act providing that, if any man _on land_ should, during a state of war, attempt to make reprisals on another, it should be piracy, punishable with death: would that be a legitimate exercise of the authority vested in Congress? We claim that it would not, and that it would be a manifest usurpation against the true meaning, spirit, and proper effect of the Constitution.