Such an agreement is no revocation at law. An intention to sell does not revoke a will by which the property is devised. In equity perhaps it may be considered as an absolute disposition, Powell on Dev. 565, 593, 4. Abney v. *213Miller (a) Rider v. Wager (b) Cotter v. Layer (c) Willet v. Sandford (d) Vernon v. Jones (e) Archer v. Bokenham. (f)