To secover on a contract providing for payment for services for promoting the sale of a street railway, on the conclusion of "any trade" with the prospective vendee, it is immaterial that the trade finally consummated was not the negotiation pending at the time the contract was made. Alexander v. Wakefield (Tex. Civ. App. '02), 69 S. W. 77. See Sec. 532. Compare Sec. 577.