In English legislation. An estate or fee that has a qualification subjoined thereto, and which must be determined anytime the qualification annexed to it really is at an, end. 2 Bl. Comm. 109. Wiggins Ferry Co. v. Railroad Co., 94 111. 93; camp-meeting Ass'n v. East Lyme, 54 Conn. 152, 5 Atl. 849.