In an action by a broker to recover commissions on an exchange of property effected by him, whether a written agreement by plaintiff to wait for his commissions until title closed, was signed before or after the signing of the contract of exchange was immaterial, where all the terms of the written contract of exchange were fully agreed on, on the preceding day, the subsequent agreement to wait for the accrued commissions being unsupported by a consideration. Hough v. Baldwin, 99 N. Y. S. 545, 50 Misc. 546. See also Sec. 19.