A broker bringing about an exchange of properties between the owners thereof, pursuant to an agreement with one of them stipulating that he will pay to the broker certain sums on the signing of a contract, passing of the title, and on a sale of the acquired land, has no title or interest in either of the properties. Lindheim v. Cen. Nat. Realty, etc., Co., 97 N. Y. S. 619, 111 App. Div. 275; Mitschen v. Swensen (Or. Sup. '09), 99 P. 277. See Sec. 16.