Where there is an issue either direct or collateral on the forgery of papers, courts of equity or law will compel their produo- tion for inspection in advance of trial. A party to an action at law may, before trial, maintain a bill for discovery of let- ters relied on by the other party to the suit and alleged to have been written by the plaintiff in the bill, but which the plaintiff alleges are forgeries. The production of private writings in which another person has an interest may be had by a hill of dis covery in proper cases, or in trials at law by an order for inspection, a notice to pro- duce or a writ of subpœna duces tecum. The order for inspection, though now provided for by statute in most states, was within the practice of the English com- mon-law courts at an early date. It is re- sorted to where documents in the. posses- sion of the other party are required for use in preparing the pleadings either by the plaintiff; 4 Bing. 539; 1 Taunt. 386; 8 Dowl. 118; 89 Hun 613; or the defendant; 2 Cr..& M. 456; 6 B. & S. 888; 1 App. Div. N. Y. 136; but an order requiring a pros- pective defendant to produce books at an examination by plaintiff to enable the lat- ter to prepare his complaint is erroneous; 81 Hun 496. Where there was but one copy of an agreement between two per- sons, he who retained it would be com- pelled to produce it for the inspection of the other who might also take a copy of it, as, in the case of a partnership agreement; 1 Brod. & B. 818; or a lease; 4 Taunt. 666; or plans constituting part of an agree- ment sued on; 70 Fed. Бер. 337. The practice was originally confined to cases in which there was but one copy, but it was speedily extended to any case in which the parties seeking an inspection have an interest in the document; 8 C. В. N. S. 617; nor was it necessary that it should be a single paper, but it extended to correspondence, as, a letter accepting an oral offer; id. An order for inspection might also be obtained by a defendant who suggested the alteration or forgery of the document which formed the cause of ac- tion; 2 Man. & G. 758. In such a case it was usual and proper for the application to be founded on an affidavit attacking the genuineness of the paper; 3 Cow. 17. The right of inspection is confined to documents supporting the case of the party applying for it and does not extend to those which support the case of his oppo- nent; 1 Myl. & K. 88; 4 Ves. 66; 8 Eng. Rul. Cas. 712, and notes; nor can the right be used for the purpose of finding out the case of the other party: 6 C. B. N. S. 679; [1897] 2 Q. B. 62; or where the books ap- plied for contain entries of a confidential, privileged nature, not relative to the ac- tion, and the legitimate information from them can be obtained at the trial, and they are in possession of the plaintiff and can be produced under subrcena: 20 App. Div. N. Y. 330; and in a libel suit an order will not be made for the production of the orig- inal manuscript where the publication is admitted: [1897] 2 Q. B. 189; [1895] 20. B. 148. If, however, the party is entitled to the production of the document as be- ing applicable to his case, his right is un- affected by the circumstance that it dis- closes the case of his opponent; id.; or that it is evidence for the other party's case also; 180 Pa. 14. The right of common-law courts to order an inspection was established in England by stat. 14 & 15 Vict. c. 99, § 6, which au- thorized the exercise of the power where an action was pending, and documents were in the control of the other party, of which by a bill of discovery the inspection could be secured. In the United States prior to the statutes of the same character which were passed in most states, the courts were indisposed to assume the power; 6 Cor. 62; and resort was more frequently had to a bill of discovery, the use of which is now usually unnecessary except in special cases. There is no fed- eral statute definitely applying to the sub- ject, though Rev. Stat. §§ 724, 858, 914, provide for the production of documents at the trial and in those courts therefore to secure an inspection before the trial a bill of discovery must still be resorted to. At least it would appear that the weight of the earlier authorities confines production under the section cited to the trial; 23 Fed. Rep. 82; 32 id. 743; contra, 9 id. 577; 67 id. 18. See, also, 1 Fost. Fed. Pr. § 267. As to notice to produce and subpæna duces tecum, see those titles. Public documents are subject to the gen- eral rule that their inspection will not be ordered where it would be detrimental to the public interest; 3 Tayl. Ev., 9th ed. § 1483; 1 Gréenl. Ev. §§ 251, 476. As to the right of inspection of public records gen- erally, see RECORDS. It has been held that corporation books are not open to the inspection of strangers; 8 Term 590; 8 B. & C. 375; 44 Barb. 64; or in a litigation to which the corporation is not a party; 85 Fed. Rep. 15; contra, 15 id. 716; but its members