The general rule of law, as to commissions, undoubtedly is, that the whole service or duty must be performed, before the right to any commissions attaches, either ordinary or extraordinary; for an agent must complete the thing required of him, before he is entitled to charge for it. In the case of brokers employed to sell real estate, it is well settled that they are entitled to their commission when they have found a purchaser, even though the negotiations are conducted and concluded by the principal himself; and also where there is a failure to complete the sale in consequence of a defect in title and no fault on the part of brokers
