The evidence that payments were to be made as the lands were subdivided cannot be considered as evidence to prove uncertainty. As a general rule, when a contract is wholly in writing, neither party may adduce extrinsic evidence: Jacobs v. Batavia & General Plantations Trust, Ltd., [1924] 1 Ch. 287, per P.O. Lawrence J. at p. 295. By way of exception to the general rule against parol evidence, extrinsic evidence is admissible to cure uncertainty. Here, however, the interim agreement is clear and unambiguous and it stands as creating contractual rights and obligations.
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