In Scots law, excambion is the exchange of land. The deed whereby this is effected is termed "Contract of Excambion".
There is an implied real warranty in this contract, so that if one portion is evicted or taken away on a superior title, the party losing the property is entitled to demand the return of the other given in exchange.
Barclay, Hugh (1855). A Digest of the Law of Scotland (Second Edition). Edinburgh: T. & T. Clark. p. 319.
Shumaker, Walter A.; George Foster Longsdorf (1922). The Cyclopedic Law Dictionary (Second Edition by James C. Cahill ed.). Chicago: Callaghan and Company. p. 376.