Where the principal tried to get the broker to negotiate a trade of his land for a house, stating that he was willing to give $1,000 boot, and would give plaintiff $100 if the trade was consummated and the trade was made by the principal consenting to give more boot, the broker was entitled to his commission. Carson v. Baker, 2 Colo. App. 248, 29 P. 1134. In the absence of an agreement limiting to a fixed price beyond which the purchaser had to go to effect the purchase. Lestrade v. Vanzini, 6 La. Ann. 399. See also Sec. 24.