27 V.S.A. § 371

When a grantor or lessor dies or leaves the State without acknowledging the grantor's or lessor's deed, the execution of the deed may be proved by the testimony of a subscribing witness before a Justice of the Supreme Court or a Superior Judge. If all the subscribing witnesses to the deed are dead or out of the State, the execution of the deed may be proved before the Supreme or Superior Court by proving the handwriting of the grantor or lessor and of a subscribing witness or adducing other evidence to the satisfaction of the court. Such evidence entered on the deed or annexed thereto shall be equivalent to the grantor's or lessor's acknowledgment of the deed.