Where a vendor agreed to pay his agent's commissions for selling the land out of the purchase money as it was paid in proportionate amounts, and on foreclosure of the purchase money mortgage, the vendor bids in the property for the full balance then unpaid and costs, the whole commission becomes due on the confirmation of such foreclosure sale. Crane v. Eddy, 191 I11. 645, 61 N. E. 431, 85 Am. St. Rep. 384.

In an action for a broker's commissions, evidence that defendant applied to witness to know what to do concerning the proposed purchaser's proposition to pay for the land in monthly installments, the witness's advice given in response, was inadmissible. Leuschner v. Patrick (Tex. Civ. App. '07), 103 S. W. 664.

A contract to perform a given duty for a given sum would be entire, but a contract to perform the same duty for a given sum, to be paid in installments as the performance progressed, would be severable, so far as the right to recover the several installments is concerned. Mechem on Agency, Sec. 634.

An agent to sell land may agree that the payment of his commission shall be dependent on the purchaser's paying either a specified part or all of the price. Martineau v. Hanson, 155 P. 432, 47 Utah, 549.