In an action for commissions for services as broker, the amount which the plaintiff is entitled to recover is a question of fact, on which the judgment of the appellate court is conclusive. Smith v. Mayfield, 163 I11. 447, 45 N. E. 157; Kurtz v. Payne Inv. Co., 135 1ST. W. 1075, 156 Iowa, 376, pet. for re. over. but opinion mod., 137 ST. W. 460; Evans v. Bublee, 183 P. 83, - Wash. Sup. - .