Where the evidence of plaintiff, suing to recover commissions for procuring a purchaser for defendant's land, of itself makes out a case, the court will not direct a verdict in his favor, if the evidence of the defendant shows that under the contract plaintiff was restricted to negotiate a sale with certain persons, and the one procured by him did not belong to that class. Meyer v. Strauss, 58 N. Y. S. 904, 42 App. Div. 613.