By the statement of a real estate owner to a broker that if the latter or any one else could secure a purchaser for the land by a certain date, on terms specified, the land might go, gives the broker nothing more than a revocable authority binding the owner to pay commissions only in case a purchaser is found before revocation, and is not an agreement that the agency shall continue until the date specified. Milligan v. Owen, 123 Iowa, 285, 98 N. W. 792; Kane v. Dawson, 52 Wash. 411, 100 P. 837.