Where a real estate broker employed to sell land negotiates an exchange for other lands, his principal making the contract, there is no legal duty devolving upon the broker to ascertain correctly the facts affecting the value of the lands received in exchange, and for misrepresentations made to his principal in good faith concerning the same he is not responsible. Coe v. Ware, 40 Minn. 404, 42 N. W. 205; Hussey v. Michael, 138 P. 596, 91 Kan. 542. See also Sec. 454.