This case was filed in this court on December 29, 1911. Plaintiffs in error have failed to serve and file their brief in compliance with rule 7 of this court (20 Okla. viii, 95 Pac. vi), or within the extension of time thereafter granted by the court; and upon the authority of Douglas v. Clayton Townsite Co., 29 Okla. 9, 115 Pac. 1016, Bank of Taft v. Thompson, 29 Okla. 683, 119 Pac. 124, Bruce v. Ketcham, 29 Okla. 685, 119 Pac. 124, and Lugrand v. Harris, 29 Okla. 690, 119 Pac. 127, this appeal must be dismissed for want of prosecution.