And be it enacted That so much of the said Act passed in the Fiftieth Year of His said late Majesty's Reign as provides that the Six Assistants of the Principal Clerks of Session shall prepare the abridged Forms of Extracts therein directed to be observed, and as provides Salaries to such Six Assistants in respect of the Preparation thereof, shall, from and after the Twentieth Day of June in this present Year, be repealed; and all Extracts whatsoever which are now pursuance of the said recited Act prepared by the said Assistants, shall thenceforth be prepared by one or other of Four Extractors, to be appointed in manner herein-after directed, and their Successors in Office, and shall be authenticated by the Signature of the Extractors by whom the same shall have been prepared respectively in the same Manner and to the same Effect as such Extracts are now authenticated by the Signature of a Principal Clerk of Session; and the Forms of Extracts enjoined by the said Act to be used, shall be so far altered.