One may be estopped by his representations or conduct from repudiating a transaction. Christensen v. Wooley, 41 Mo. App. 53; Dutcher v. Empire League, 113 N. Y. S. 1083; Fonch v. Wilson, 59 Ind. 13; Elsea v. Fassler, 154 P. 1067, 29 Cal. App. 187; McKibbin v. Wilson, 182 P. 638, - Kan. Sup. -; Thornhill v. Masurca, 216 S. W. 810, - Mo. App. -; Goodwin v. Riddle, 85 S. 433, - Ala. Sup. -; De la Cuesta v. Armstrong Holding Co., 192 P. 135, - Cal. App. -; Greenberg v. Schwinski, 179 N. W. 234, - Mich. Sup. - .