Section 61. Directors from districts

The by-laws may provide for the use of
  one  or  more  of  the  following:  (a)  that the territory in which the
  corporation has members shall be divided into designated districts,  and
  that  directors  shall be nominated or elected therefrom in a designated
  number and  manner,  either  by  the  members  therein  or  by  district
  delegates  elected  by  such  members or by the membership at large; (b)
  that primary nominations or elections shall be held in each district  to
  nominate the directors apportioned to such districts and that the result
  of  all  such  primary  elections  may  be  ratified by the next regular
  meeting of the  corporation  or  may  be  considered  final  as  to  the
  corporation;  (c)  that,  in  the  case  of  a  corporation having local
  associations, incorporated or otherwise, affiliated with it or a  member
  of  it,  election  of  a  designated  number  of directors may be by the
  members of such local association at  a  meeting  thereof,  followed  by
  transmission  of  the  ballots and of a certified canvass thereof to the
  annual meeting of the corporation; (d) that one or more directors may be
  appointed  by  any  public  official  or  commission  or  by  the  other
  directors. Directors so appointed shall represent primarily the interest
  of  the  general  public in such corporation; need not be members of the
  corporation; and shall not constitute more than one-fifth of the  entire
  number of directors.