In an action for commissions agreed to be paid per acre in a sale of property, instructions relating to plaintiff's claim to the excess of purchase money above a named sum cannot have prejudiced defendant when the jury expressly found that no purchase money was received in excess of that sum. Wilson v. Everitt, 139 U. S. 616, 11 Sup. Ct. 664; Gaume v. Horgan, 122 Mo. App. 700, 99 S. W. 457.