An agent for the sale of lands who turns the property over to another to sell, with consent of the owner, and thereafter does nothing to effect a sale, loses his right to a commission, not on the ground of assignment, but because of a waiver of his right to make a sale; and he is estopped to assert any interest in the commissions resulting from the sale made by the other. Munson v. Mabon, 135 Iowa, 335, 112 N. W. 775.