Where, in an action by a real estate broker for commissions, the issues involved the question whether the efforts of the broker were the procuring cause of the sale, an instruction authorizing a recovery on a finding that the broker was employed to procure a purchaser and introduced a customer to the owner to whom a sale was subsequently made, without requiring a finding that the broker was the procuring cause of the sale was erroneous. Russell v. Poor (Mo. App. '08), 115 S. W. 1.