An agent can not become the buyer of the principal's property, even when there is a sale at a particular price. Ruckman v. Burgholz, 37 N. J. L. 437; Armstrong v. Elliott, 29 Mich. 485. Compare Secs. 40, 290. Welling v. Poulsen (Mich. Sup. '10), 125 N. W. 373; Single v. Russell, 80 A. 164, 114 Md. 418; Sawyer v. Issenbuh, 141 N. W. 378, 31 S. D. 502.