Section 97. Housing debt fund, and urban renewal debt fund

All the moneys
  repaid  to  the  state,  both  principal  and  interest  on  account  of
  advancements  made  and  to be made to cities, towns, villages or public
  corporations specified in section two of article eighteen of  the  state
  constitution  from proceeds of state bonds sold or to be sold to provide
  moneys for low rent housing or urban renewal shall,  when  received,  be
  paid  into  and shall constitute a special fund in the state treasury to
  be known as "housing debt fund, " or "urban renewal debt fund, " as  the
  case  may  be.  Such  fund  shall  be  available  only  for  payment  of
  appropriations to pay installments of principal of and interest on  such
  bonds.  Appropriations  in  any year to pay installments of principal of
  and interest on any such state bonds  shall  first  be  paid  from  such
  special  fund, so far as the amount of moneys therein will pay the same,
  and the remainder, if any, shall be paid from any other  moneys  in  the
  state treasury not otherwise appropriated.