 As this was clear and unambiguous, and did not, in its description of the land, refer to Victory Hill, Le Riche was unsuccessful.Whether the document amounts to an integration of the agreement depends on whether the parties intended it to be the exclusive record thereof.The extrinsic evidence is excluded because it relates to matters that, by reason of the reduction of the contract to writing and its integration in a single memorial, have become legally immaterial or irrelevant.