Where Notice has been given to try by Special Jury, either Party may, Six Days before the First Day of the Sittings in London or Middlesex, or Adjournment Day in London, or Commission Day of the Assizes, give Notice to the Sheriff that such Cause is to be tried by a Special Jury ; and in case no such Notice be given no Special Jury need be summoned or attend, and the Cause may be tried by a Common Jury, unless otherwise ordered by the Court or a Judge.