Section 100. Appointment and salary of county superintendent

The board of
  supervisors of any county may appoint a county superintendent, determine
  the amount of the bond which he shall give, fix his salary, and  provide
  for  the  payment  of  all  the necessary expenses incurred while in the
  performance of his duties, which salary and expenses shall be  a  charge
  against  the county road fund, and may remove such county superintendent
  for malfeasance or misfeasance in office, upon written charges, after an
  opportunity to be heard, not less than five days after the service  upon
  such  superintendent  of  a  copy of such charges. The term of office of
  each superintendent or county engineer appointed by  any  other  law  to
  perform  the  duties of county superintendent shall be four years unless
  sooner removed by the board of supervisors as above provided.