I concur. If the broadest view be adopted with respect to the admissibility of evidence of the circumstances surrounding the parties, or contemplated by them when a contract is entered into, the witness ought not to have been permitted to state what, in his judgment, was the result of the circumstances; or that, in his opinion, they limited or changed the language of the written contract. Nor was this evidence of a usage or custom; or that language, unambiguous in itself, was, in the presence of such usage or custom, used in a peculiar sense, or bore a signification differing from that which it would ordinarily import.