A joint owner of real estate who consents to a listing there of by his co-owner with real estate agents for sale, receives part of the consideration, and does not repudiate the sale made by the agents, after discovery that they were guilty of fraud, is estopped to deny connection with the fraud, but will be held liable only to the extent of the benefit actually received. Alger v. Anderson, 78 Fed. 729. See also Sec. 856.