Where, in an action for a broker's commissions for negotiating a purchase, it appeared that if he had been employed, he was entitled to a fixed commission under the contract, evidence was inadmissible to show what was a reasonable commission for the services. Hanna v. Espalla, 148 Ala. 313, 42 S. 443; McDermott v. Abney, 106 Iowa, 749, 77 N. W. 505; Beatty v. Russell, 41 Neb. 321, 59 N. W. 919; Evans v. Gay, 38 Tex. Civ. App. 442, 74 S. W. 575; Fortran v. Stowers, 113 S. W. 631 (Tex. Civ. App. '08); Goldstein v. D'Arcy, 87 N. E. 584,

201 Mass. 312; Canton-Hughes Pump Co. v. Llera, 215 F. 79, 131 C. C. A. 287; Kohen v. Kieley, 129 N. Y. Sup. 353; Kitchen v. Kaveny, 145 N. W. 543, 33 S. D. 312; Walker v. O'Neal 94 S. E. 835, - Ga. App. -