306. The admission of extrinsic evidence.

In order to determine a boundary by reference to the provisions of a conveyance, extrinsic evidence is admissible of all material facts existing at the time of execution of the deed, so that the court may have the same knowledge as the parties to the deed then had1. The question is: what would the reasonable layman think he was in fact buying?2. It has been said that such extrinsic evidence is not admissible as an aid to interpreting a conveyance, unless the relevant provisions of the deed are uncertain, contradictory or ambiguous3; but, more recently, that statement has been