(1)It shall be lawful for the High Court by Act of Adjournal from time to time as to them shall seem necessary after consultation with the Lord Advocate—
(a)to alter the existing circuits of the High Court, to form new circuits, and to fix and determine the limits of each existing or new circuit, and the regions and districts or parts thereof which shall be included within the same;
(b)to detach any portion of the district exclusively attached to the said High Court sitting at Edinburgh from such district and to include the same in any adjoining circuit or to detach any district from an adjoining district and to include the same in the district exclusively attached to the said High Court sitting at Edinburgh;
(c)to fix and determine the number of circuit courts to be held and the places at which the same shall be held within each such circuit in each year, and to define the periods of the year at which such circuit courts shall be held and to alter the same as occasion shall require, and to appoint the particular dates of such courts; and
(d)to make such provision as may be necessary for the carrying out of the powers hereinbefore conferred, including such modifications as may appear to be necessary in the existing statutory provisions for preparing and keeping jury books and for making returns of and summoning jurors to serve on any assize for the trial of criminal cases.
(2)The High Court shall hold such sittings for the trial of criminal cases from time to time as may be necessary on the requisition of the Lord Advocate.