Section 140. Trusts for public parks, playgrounds, libraries and public buildings

It shall be lawful to grant and devise real  estate,  and  to  give  and bequeath personal property to trustees and their successors in
  trust,  for  the  purpose  of  creating,  continuing  and   maintaining,
  according  to  the terms, conditions and provisions of such grant, gift,
  devise or bequest, one or more public parks, or public playgrounds, or a
  public library, or a public building, or for the purpose of  aiding  and
  instructing  children,  or  for any one or more of such purposes, in any
  city, village or town of this state. The number of such  trustees  shall
  not be less than three nor more than nine.