A written power to sell land does not include power to give an option, unless so expressed. Tibbs v. Zirkle, 55 W. Va. 49, 46 S. E. 701, 104 Am. St. E. 977; Swift v. Erwin, 148 S. W. 267, 104 Ark. 459, Ann. Cas. 1914 C, 363. See references under Sec. 307.