The clerk shall write the name of each person so selected as a member of such jury panel on a separate slip of paper and place the same in a separate receptacle, so designed as to conceal the name, and place all such receptacles in a box to be kept for that purpose. Juries in all cases drawn in accordance with the provisions of this act shall consist of 6 persons, or less, if agreed to by both parties. At the opening of the trial, the clerk shall draw from said box 6 names and if any so drawn shall not be present or shall be excused, additional names shall be drawn until a jury is secured. If the panel shall be exhausted before the jury is secured the judge shall order such additional names as he may deem necessary drawn from the box provided for in section 6 hereof, in accordance with the procedure set forth in section 9 hereof, and the persons whose names are so drawn shall forthwith be summoned to appear, and the drawing of a jury continued in accordance with the provisions of this section until a jury is secured.