Ordinarily the principal is not liable to compensate a sub-agent employed by the broker to sell the property, although authorized to take any steps necessary. Carroll v. Tucker, 21 N. Y. S. 952, 2 Misc. 397; Mason v. Clifton, 3 F. & F. (Eng.) 899; J. B. Watkins Ld. Mtge. Co. v. Thetford (Tex. Civ. App. '06), 96 S. W. 72; Benham v. Ferris (Mich. Sup. '10), 124 N. W. 538; Sterling v. De Laune (Tex. Civ. App. '07), 105 S. W. 1169. See also Sec. 25. Unless he has ratified the appointment of the sub-agent. Warren Com., etc., Co. v. B. E. Co., 120 Mo. App. 432, 96 S. W. 1038.