Section 166. Changing number of trustees

Any such incorporated church may,
  at  an  annual  corporate  meeting, change the number of its trustees to
  three, six, nine, twelve or fifteen, classifying them so that the  terms
  of  one-third  expire  each  year, provided that notice of such intended
  change be included in the notice of such annual  corporate  meeting.  No
  such  change  shall affect the terms of the trustees then in office; and
  if the change reduces the number of trustees,  elections  shall  not  be
  held  to  fill  the  vacancies  caused by the expiration of the terms of
  trustees, until the number of trustees equals the number  to  which  the
  trustees  were  reduced.    Whenever the number of trustees in office is
  less than the number so determined on,  sufficient  additional  trustees
  shall  be  elected to make the number of trustees equal to the number so
  determined on. The trustees so elected, up to and including one-third of
  the number so determined on, shall  be  elected  for  three  years,  the
  remainder  up  to and including one-third of the number so determined on
  for two years, and the remainder for one year.