When an agreement to convey, or a will, or conveyance of real property, is imperfect in feudal form, but good in substance, specific performance may be enforced by the grantee, purchaser, or devisee, by an action styled an adjudication in implement, the decree in which is equivalent to a conveyance.

Source: Kinnear, Digest of House of Lords cases (1865), pg. 347.