Decisions of a court constitute a precedent of binding obligation only within the particular territorial jurisdiction which is subject to its process. In the tribunals of one State decisions rendered in another on legal points are, so far as respects transactions not governed by its local law, without any authoritative force. They may be read, just as the opinions of an author expressed in a legal treatise, or as the decisions of an English or German court might be, for what they appear to be worth. No formal proof that they were really the deliverances of the court from which they purport to emanate is necessary to support their use for this purpose. The reported decisions of courts of other States, whether published officially or unofficially, may be cited in argument in any cause, to fortify the claims of counsel as to the proper rules to be followed in reaching a decision. For this use they are introduced simply for the intrinsic value of the reasoning and conclusions. If it is claimed that they prove the law of the State from which they come to be of a certain nature (and that is a material point in the case), they should be made the subject of proof before argument.[Footnote: Hanley _v._ Donoghue, 116 U. S. Reports, 1.] In many States this is dispensed with by statutes allowing courts to take judicial notice of all reported decisions in other States; that is, in effect, to take any means which they think proper to learn what they are. It is also the general practice of the bar where no such statutes exist to allow the reports of other States to be read for any purpose without objection. Most States have statutes to facilitate the proof in court of the statute laws of other States. The mode prescribed by Act of Congress (Revised Statutes, Sec. 905) under the constitutional provision, to which reference has been made, involves considerable expense for the proper certification of copies. Common provisions of State legislation are that all courts may take judicial notice of the laws of other States (that is, take them into account without any formal proof at all), or that a copy of the official publications containing them shall be competent evidence of what they are.