A contract of agency to sell land provided that if the cash payment of any sale was equal to $3.50 per acre the broker should receive his commissions in full, but if less, then the broker should receive only one-half of his commissions, the other half to be paid when the second installment was collected from the purchaser. Held, in an action to recover the balance of commissions on land sold, that, where half the commissions had been received, the agent must show, either that the second installment had been paid to the owner, or that it had not been collected by reason of the owner's fault. Burnet v. Edling, 19 Tex. Civ. App. 711, 48 S. W. 775; Larson v. Burroughs, 116 N. Y. S. 358.