law: 6. Vacancies among District or Subordinate Judges.
  (1) Whenever the office of District Judge or Subordinate Judge is vacant by reason of the death, resignation or removal of the Judge or other cause, or whenever 2(an increase in the number of District or Subordinate Judges has been made under the provisions of section 4], the 3[State Government or, as the case may be, the High Court] may fill up the vacancy or appoint the additional District Judges or Subordinate Judges 4***.
  (2) Nothing in this section shall be construed to prevent a State Government from appointing a District Judge or Subordinate Judge to discharge, for such period as it thinks fit, in addition to the functions devolving on him as such District Judge or Subordinate Judge, all or any of the functions of another District Judge or Subordinate Judge, as the case may be.