In an action for commissions for procuring purchasers of land, a letter from the defendant to the plaintiffs stating that they had not received all the earnest money, part of it remaining in escrow in the bank until it should be determined if they were entitled to it, and that they would pay the balance as soon as they received that amount, did not constitute an estoppel against a claim by the defendants that they were not to pay commissions until the contract was fully completed. Tracey Land Co. v. Polk Co. Ld. & Loan Co., 131 Iowa, 40, 107 N. W. 1029.