Where plaintiff was employed to sell a vested remainder owned by defendant for $55,000 net to the defendant, the purchaser to receive $175,000 if the life tenant should live less than ten years, and $195,000 if she should live more than eleven years, and the purchaser to be required to reassign to the defendant $10,000 if the life tenant should die within eleven years, $20,000, if within ten years, $25,000, if within nine years, and $28,000, if within eight years, and the purchaser accepted the proposition to buy, and instead of $195,000, with certain contingent sums to be reassigned on the death of the life tenant within ten years, not corresponding to those provided in the terms of the contract with plaintiff, he was not entitled to recover the agreed compensation for his services. Header v. Brown, 102 N. Y. S. 32, 116 App. Div. 734. See references under Sec. 307.