A broker hired to sell property at a certain price can not recover commissions for effecting a sale at a lower price, and the appellate court held that the case was properly taken from the jury. Williams v. McGraw, 52 Mich. 480, 18 N. W. 227; Brown v. Adams, (R. I. Sup. '08), 69 A. 601. See also Sec. 558.