pendence in their judicial departments. Supervision over either the legislative or the judicial action of the States is in no case permissible except as to matters by the Constitution specifically authorized or delegated to the United States. Any interference with either, except as thus permitted, is an invasion of the authority of the State and, to that extent, a denial of its independence." The fallacy underlying the rule declared in Swift v. Tyson is made clear by Mr. Justice Holmes.23 The doctrine rests upon the assumption that there is "a transcendental body of law outside of any particular State but obligatory within it unless and until changed by statute," that federal courts have the power to use their judgment as to what the rules of common law are; and that in the federal courts "the parties are entitled to an independent judgment on matters of general law": "but law in the sense in which courts speak of it today does not exist without some definite authority behind it. The common law so far as it is enforced in a State, whether called common law or not, is not the common law generally but the law of that State existing by the authority of that State without regard to what it may have been in England or anywhere else. "the authority and only authority is the State, and if that be so, the voice adopted by the State as its own [whether it be of its Legislature or of its Supreme Court] should utter the last word." Thus the doctrine of Swift v. Tyson is, as Mr. Justice Holmes said, "an unconstitutional assumption of powers by courts of the United States which no lapse of time or respectable array of opinion should make us hesitate to correct." In disapproving that doctrine we do not hold 23 Kuhn v. Fairmont Coal Co., 215 U. S. 349, 370-372; Black & White Taxicab Co. v. Brown & Yellow Taxicab Co., 276 U. S. 518, 532-36. Opinion of BUTLER, J. 304 U.S. unconstitutional § 34 of the Federal Judiciary Act of 1789 or any other Act of Congress. We merely declare that in applying the doctrine this Court and the lower courts have invaded rights which in our opinion are reserved by the Constitution to the several States. 24 Fourth. The defendant contended that by the common law of Pennsylvania as declared by its highest court in Falchetti v. Pennsylvania R. Co., 307 Pa. 203; 160 A. 859, the only duty owed to the plaintiff was to refrain from wilful or wanton injury. The plaintiff denied that such is the Pennsylvania law. In support of their respective contentions the parties discussed and cited many decisions of the Supreme Court of the State. The Circuit Court of Appeals ruled that the question of liability is one of general law; and on that ground declined to decide the issue of state law. As we hold this was error, the judgment is reversed and the case remanded to it for further proceedings in conformity with our opinion. Reversed. MR. JUSTICE CARDOZO took no part in the consideration or decision of this case. MR. JUSTICE BUTLER. The case presented by the evidence is a simple one. Plaintiff was severely injured in Pennsylvania. While walking on defendant's right of way along a much-used path at the end of the cross ties of its main track, he came into collision with an open door swinging from the side of a car in a train going in the opposite direction. Having been warned by whistle and headlight, he saw the locomo 24 Tompkins also contended that the alleged rule of the Falchetti case is not in any event applicable here because he was struck at the intersection of the longitudinal pathway and a transverse crossing. The court below found it unnecessary to consider this contention, and we leave the question open. 64 Opinion of BUTLER, J. tive approaching and had time and space enough to step aside and so avoid danger. To justify his failure to get out of the way, he says that upon many other occasions he had safely walked there while trains passed. Invoking jurisdiction on the ground of diversity of citizenship, plaintiff, a citizen and resident of Pennsylvania, brought this suit to recover damages against defendant, a New York corporation, in the federal court for the southern district of that State. The issues were whether negligence of defendant was a proximate cause of his injuries and whether negligence of plaintiff contributed. He claimed that, by hauling the car with the open door, defendant violated a duty to him. The defendant insisted that it violated no duty and that plaintiff's injuries were caused by his own negligence. The jury gave him a verdict on which the trial court entered judgment; the circuit court of appeals affirmed. 90 F. (2d) 603. Defendant maintained, citing Falchetti v. Pennsylvania R. Co., 307 Pa. 203; 160 A. 859, and Koontz v. B. & O. R. Co., 309 Pa. 122; 163 A. 212, that the only duty owed plaintiff was to refrain from willfully or wantonly injuring him; it argued that the courts of Pennsylvania had so ruled with respect to persons using a customary longitudinal path, as distinguished from one crossing the track. The plaintiff insisted that the Pennsylvania decisions did not establish the rule for which the defendant contended. Upon that issue the circuit court of appeals said (p. 604): "We need not go into this matter since the defendant concedes that the great weight of authority in other states is to the contrary. This concession is fatal to its contention, for upon questions of general law the federal courts are free, in absence of a local statute, to exercise their independent judgment as to what the law is; and it is well settled that the question of the responsibility of a railroad for injuries caused by its servants is one of general law.” 81638-38- -6 Opinion of BUTLER, J. 304 U.S. Upon that basis the court held the evidence sufficient to sustain a finding that plaintiff's injuries were caused by the negligence of defendant. It also held the question of contributory negligence one for the jury. Defendant's petition for writ of certiorari presented two questions: Whether its duty toward plaintiff should have been determined in accordance with the law as found by the highest court of Pennsylvania, and whether the evidence conclusively showed plaintiff guilty of contributory negligence. Plaintiff contends that, as always heretofore held by this Court, the issues of negligence and contributory negligence are to be determined by general law against which local decisions may not be held conclusive; that defendant relies on a solitary Pennsylvania case of doubtful applicability and that, even if the decisions of the courts of that State were deemed controlling, the same result would have to be reached. No constitutional question was suggested or argued below or here. And as a general rule, this Court will not consider any question not raised below and presented by the petition. Olson v. United States, 292 U. S. 246, 262. Johnson v. Manhattan Ry. Co., 289 U. S. 479, 494. Gunning v. Cooley, 281 U. S. 90, 98. Here it does not decide either of the questions presented but, changing the rule of decision in force since the foundation of the Government, remands the case to be adjudged according to a standard never before deemed permissible. The opinion just announced states that "the question for decision is whether the oft-challenged doctrine of Swift v. Tyson [1842, 16 Pet. 1] shall now be disapproved." That case involved the construction of the Judiciary Act of 1789, § 34: "The laws of the several states, except where the Constitution, treaties, or statutes of the United States otherwise require or provide, shall be regarded as rules of decision in trials at common law in the courts of 64 Opinion of BUTLER, J. the United States in cases where they apply." Expressing the view of all the members of the Court, Mr. Justice Story said (p. 18): "In the ordinary use of language it will hardly be contended that the decisions of Courts constitute laws. They are, at most, only evidence of what the laws are, and not of themselves laws. They are often re-examined, reversed, and qualified by the Courts themselves, whenever they are found to be either defective, or ill-founded, or otherwise incorrect. The laws of a state are more usually understood to mean the rules and enactments promulgated by the legislative authority thereof, or long established local customs having the force of laws. In all the various cases, which have hitherto come before us for decision, this Court have uniformly supposed, that the true interpretation of the thirty-fourth section limited its application to state laws strictly local, that is to say, to the positive statutes of the state, and the construction thereof adopted by the local tribunals, and to rights and titles to things having a permanent locality, such as the rights and titles to real estate, and other matters immovable and intraterritorial in their nature and character. It never has been supposed by us, that the section did apply, or was designed to apply, to questions of a more general nature, not at all dependent upon local statutes or local usages of a fixed and permanent operation, as, for example, to the construction of ordinary contracts or other written instruments, and especially to questions of general commercial law, where the state tribunals are called upon to perform the like functions as ourselves, that is, to ascertain upon general reasoning and legal analogies, what is the true exposition of the contract or instrument, or what is the just rule furnished by the principles of commercial law to govern the case. And we have not now the slightest difficulty in holding, that this section, upon its true intendment and construction, is strictly limited to local statutes and local usages of the character |