"Where, in an action against a broker for failure to account for a part of the price received by him, the issue was, whether the broker sold the land to the purchaser through a third person, as his agent, or whether he sold it to a third person who . resold it to the purchaser, evidence of the value of the property at the time of the sale was immaterial. Buchanan v. Bandall (S. D. Sup. '06), 109 N. W. 513.