And be it enacted, That from and after the passing of this Act, the Principal and Assistant Keepers of the Register of Deeds, Probative Writings and Instruments of Protest, recorded in the Books of Council Land, Session, shall lie tinder the immediate Control and Direction Lord Clerk Register and his Deputy for the Time in the Performance of the Duties of their Offices and whenever a Vacancy shall arise in any, of the said Offices, the same shall be supplied by the Nomination of, the Lord Clerk Register, and every such Nomination shall be forthwith reported to the Court; arid the Extracts or Office Copies, of all such Deeds, Probative Writings, and Instruments of Protest, before the Transmission thereof to the General Register House, shall be authenticated by the Subscription of one or other of the said Keepers, in the same Manner and to the same Effect as such Extracts have heretofore been authenticated by the Signature of a Principal Clerk of Session.