¶1This is a proceeding by a taxpayer to remove from office a county commissioner of Dawson county “for corruption” and “for wilful maladministration” — two statutory grounds. Rev. St. 1913, sec. 5698. Approval of excessive claims against- the county and misconduct resulting in their allowance and payment are the foundations of plaintiff’s charges. From a dismissal of the proceeding after a trial on the merits, plaintiff has appealed.
¶2The appeal will not be determined. The purpose of the proceeding is to oust defendant from office. His term has long since expired and the office is now occupied by his successor. No effort to advance the appeal for a decision during the incumbency of defendant was made. The delay is not attributable to him. He made a successful defense in the trial court. Being out of office he cannot now be removed therefrom. His retirement at the expiration of his official term pending the appeal was an event making it impossible for the appellate court to grant plaintiff any effectual relief on the cause of action pleaded. That event is a ground for dismissing the *750appeal, and, when not appearing on the record, may be shown by extrinsic evidence. Mills v. Green, 159 U. S. 651. The change in officers is asserted by defendant, and not denied. Courts properly decline to express an opinion on a mere abstraction, and may act on their own motion in dismissing an appeal involving only an inquiry of. that nature. Heesch v. Snyder, 85 Neb. 778.
¶3Appeal dismissed.