Section 391. Consolidated health district; board of health; organization

1.
  In  every  consolidated health district there shall be a board of health
  which shall consist of the supervisor of each town, the president of the
  board of trustees of each village, and the mayor and the supervisors  of
  each  city  included  in  each  district, provided that if the number of
  members so provided for is an even number less than seven, such  members
  shall within thirty days after such district shall have been established
  by  the commissioner choose an additional member of such board of health
  to be known as the elective member, and if  the  number  of  members  so
  provided  for  is  more  than  seven such members shall meet and elect a
  board of health of three members for such consolidated health district.
    2. A member of the board, sitting ex-officio and not as one of  a  new
  board  of  three  elected  as  hereinbefore  provided, who is the lawful
  incumbent of more than one of the offices entitling  him  to  membership
  shall have as many votes in the board as there are municipalities of the
  district,  in  which he holds such offices, and in such a case the total
  number of votes on the board shall be regarded as the number of members,
  in applying the  provisions  hereof  relative  to  the  choosing  of  an
  additional member or reducing the membership to a board of three.