Registrar-General shall record on every certificate issued by him, and in such manner as to preserve their respective priorities, memorials of all subsisting mortgages, leases, and encumbrances, and of any dower or rent-charge to which the land may be subject; and if such certificate be issued to a minor or to a person otherwise under disability, he shall record thereon the age of such minor or the nature of the disability so far as known to him.
