State by a law of Congress; that none of these bodies, therefore, derive those powers from natural or necessary right, but from express law; that Congress have no such natural or necessary power, nor any powers but such as are given them by the Constitution; that that has given them directly exemption from personal arrest, exemption from question elsewhere for what is said in the House, and power over their own members and proceedings; for these, no further law is necessary, the Constitution being the law; that, moreover, by that article of the Constitution which authorizes them "to make all laws necessary and proper for carrying into execution the powers vested by the Constitution in them," they may provide by law for an undisturbed exercise of their functions, _e. g._ for the punishment of contempts, of affrays or tumults in their presence, &c; but, till the law be made, it does not exist; and does not exist, from their own neglect; that in the meantime, however, they are not unprotected, the ordinary magistrates and courts of law being open and competent to punish all unjustifiable disturbances or defamations, and even their own sergeant, who may appoint deputies ad libitum to aid him, 3 _Grey_, 59, 147, 255, is equal to the smallest disturbances; that, in requiring a previous law, the Constitution had regard to the inviolability of the citizen as well as of the member; as, should one House, in the regular form of a bill, aim at too broad privileges, it may be cheeked by the other, and both by the President; and also as, the law being promulgated, the citizen will know how to avoid offence. But if one branch may assume its own privileges without control; if it may do it on the spur of the occasion, conceal the law in its own breast, and after the fact committed make its sentence both the law and the judgment on that fact; if the offence is to be kept undefined, and to be declared only ex re nata, and according to the passions of the moment, and there be no limitation either in the manner or measure of the punishment, the condition of the citizen will be perilous indeed. Which of these doctrines is to prevail, time will decide. Where there is no fixed law, the judgment on any particular case is the law of that single case only, and dies with it. When a new and even a similar case arises, the judgment which is to make, and at the same time apply, the law, is open to question and consideration, as are all new laws. Perhaps Congress, in the meantime, in their care for the safety of the citizens, as well as that for their own protection, may declare by law what is necessary and proper to enable them to carry into execution the powers vested in them, and thereby hang up a rule for the inspection of all, which may direct the conduct of the citizen, and at the same time test the judgments they shall themselves pronounce in their own case.$