One which is filed when a person has a right which may be controverted by various persons, at different times, and by different actions. Ritchie v. Dorland. 6 Cal. 3-“>; Murphy v. Wilmington, 6 Houst. (Del.) 108. 22 Am. St. Rep. 345; Eldridge v. Hill. 2 Johns. Ch. (X. Y.)_ 281: Randolph v. Kinney, 3 Hand. (Va.) 395.