In Equity Practice. One which is brought to secure the testimony of witnesses with reference to some matter which is not in litigation, but is liable to become so. It differs from a bill to take testimony de bene esse, Inasmuch as the latter is sustainable only when there is a suit already depending; it is demurrable if it contain a prayer for relief; 1 Dick. Ch. 98; 2 P. Wms. 162; 2 Ves. Ch. 497; 2 Madd. 87. And see 1 Sch. & L. 816. It must show the subject-matter touching which the plaintiff is desirous of giving evidence; Rep. temp. Finch 391; 4 Madd. 8, 10; that the plaintiff has a positive inter- est in the subject-matter, which may be en- dangered if the testimony in support of it be lost, as a mere expectancy, however strong, is not sufficient; 6 Ves. Ch. 260; 1 Vern. 105; 15 Ves. Ch. 136; Mitford, Eq. PL. 51; Cooper, Eq. Pl. 52; 3 J. J. Marsh. 260; Beach, Mod. Eq. Pr. 150; that the defendant has, or pretends to have, or that he claims, an interest to contest the title of the plaintiff in the sub- ject-matter of the proposed testimony; Cooper, Pl. 56; Story, Eq. Pl. § 302; and some ground of necessity for perpetuating the evidence; Story, Eq. Pl. § 303; Mitf. Eq. PL. 52, 148, n.; Cooper, Eq. Pl. 53. See 20 Ga. 777; 1 Dick. 14. The bill should describe the right in which it is brought with reasonable certainty, so as to point the proper interrogations on both sides to the true merits of the controversy; 1 Vern. 312; Cooper, Eq. Pl. 56; and should pray leave to examine the witnesses touch- ing the matter stated, to the end that their testimony may be preserved and perpet- uated; Mitf. Eq. Pl. 52.