It shall be competent .for any Female Person of the Age of Fourteen Years or upwards, and not subject to any legal Incapacity, to act as an instrumentary Witness in the same Manner as any Male Person of that Age, who is subject to no legal Incapacity, can act according to the present Law and Practice, and it shall not be competent to challenge any Deed or Conveyance or Writing or Document of whatever Nature whether executed before or after the passing of this Act on the Ground that any instrumentary Witness thereto was a Female Person.