Section 4116. Co-operation of Indians shall be sought

In the discharge of
  the duties imposed by this article, the said commissioner shall endeavor
  to secure the co-operation of all the several bands of Indians, and  for
  this  purpose, shall visit, by himself or his authorized representative,
  all the reservations where they reside, lay the matter  before  them  in
  public  assembly,  inviting them to assist either by appropriating their
  public moneys to this object, or by setting  apart  lands  and  erecting
  suitable  buildings,  or  by  furnishing  labor  or  materials  for such
  buildings, or in any other way which he or  they  may  suggest  as  most
  effectual for the promotion of this object.