Where an agent negotiating a sale of the interest in an estate accepts the valuation of the property made by the intending purchaser, and fails to examine the county records, or take other steps to inform himself of the real value, as advised to do, he will be held to have acted on his own judgment, and no relief will be granted to his principal if it turns out that the lands are more valuable than they were represented to be. Herron v. Herron, 32 N. W. 407, 71 Iowa, 428. See also, Sec. 25.