The burden of proof is on the agent to establish his fairness in the transaction. Bubidoeux v. Parks, 48 Cal. 215; Brown V. Post, 1 Hun (N. Y.), 303; Neely v. Anderson, 2 Strob. (S. C.) Eq. 262; Condit v. Blackwell, 22 N. J. Eq. 481; Alwood v. Mansfield, 59 I11. 496; Hanna v. Haynes, 42 Wash. 284, 84 P. 861; Walker v. Carrington, 74 I11. 446; Lienwen v. Kline (Iowa Sup. '09), 120 N. W. 312. Contra, Buckingham v. Harris, 10 Colo. 455, 15 P. 817; Pollatschek v. Goodwin, 40 N. Y. 682, 17 Misc. 587.