Order unanimously affirmed, with $25 costs and disbursements. Memorandum: While section 508 ultimately might be found to be unambiguous, "Even in the case of an integrated written contract, the meaning of the words may depend upon various surrounding circumstances that are in dispute; the circumstances must be found as a fact before interpretation can proceed." (3 Corbin, Contracts, § 554, p. 223.) We pass on no other questions.