F1immediately upon receipt of the authority or precept issued under section 12 of the Court of Session Act 1988, the sheriff principalor other officer or officers employed to return juries to the High Court of Justiciary shall make out a list containing the christian and surnames, additions, and places of abode of a competent number of persons qualified to serve as jurors, and shall return the said list F2to a clerk ofcourt, annexed to the said authority or precept, without delay, the names of the same persons being always inserted in the lists annexed to each authority or precept issued . . . F3in manner aforesaid; which number of jurors shall not be less than thirty-six in any F4sheriff court district county, city, town or place nor more than fifty; and the persons named in the said lists shall be summoned to serve as jurors for the trial of such issues within the F4sheriff court district named in such authorities or precepts respectively, and no others.