<TABLE> <S> <C>
 
  <ARTICLE> 6 
  <SERIES> 
    <NUMBER> 231 
    <NAME> THE MUNICIPAL BOND TRUST 
  <MULTIPLIER> 1 
  <CURRENCY> U.S.Dollars 
          
  <S>                           <C>             <C>             <C> 
  <PERIOD-TYPE>                 YEAR            YEAR            YEAR 
  <FISCAL-YEAR-END>             AUG-31-1997     AUG-31-1996     AUG-31-1995
  <PERIOD-START>                SEP-01-1996     SEP-01-1995     SEP-01-1994
  <PERIOD-END>                  AUG-31-1997     AUG-31-1996     AUG-31-1995
  <EXCHANGE-RATE>               1               1               1 
  <INVESTMENTS-AT-COST>         6,370,330       0               0 
  <INVESTMENTS-AT-VALUE>        6,938,928       0               0 
  <RECEIVABLES>                   104,634       0               0 
  <ASSETS-OTHER>                   30,187       0               0 
  <OTHER-ITEMS-ASSETS>                  0       0               0 
  <TOTAL-ASSETS>                7,073,749       0               0 
  <PAYABLE-FOR-SECURITIES>              0       0               0 
  <SENIOR-LONG-TERM-DEBT>               0       0               0 
  <OTHER-ITEMS-LIABILITIES>        41,619       0               0 
  <TOTAL-LIABILITIES>              41,619       0               0 
  <SENIOR-EQUITY>                       0       0               0 
  <PAID-IN-CAPITAL-COMMON>              0       0               0 
  <SHARES-COMMON-STOCK>             6,599       0               0 
  <SHARES-COMMON-PRIOR>             7,123       0               0 
  <ACCUMULATED-NII-CURRENT>        94,015       0               0 
  <OVERDISTRIBUTION-NII>                0       0               0 
  <ACCUMULATED-NET-GAINS>               0       0               0 
  <OVERDISTRIBUTION-GAINS>          (813)       0               0 
  <ACCUM-APPREC-OR-DEPREC>        568,598       0               0 
  <NET-ASSETS>                  7,032,130       0               0 
  <DIVIDEND-INCOME>                     0       0               0 
  <INTEREST-INCOME>               469,439       505,164         541,404
  <OTHER-INCOME>                        0       0               0 
  <EXPENSES-NET>                   18,894       19,417          20,384
  <NET-INVESTMENT-INCOME>         450,545       485,747         521,020
  <REALIZED-GAINS-CURRENT>         35,383       28,631          (15,247)
  <APPREC-INCREASE-CURRENT>        14,594       4,611           122,910
  <NET-CHANGE-FROM-OPS>           500,522       518,989         628,683
  <EQUALIZATION>                        0       0               0 
  <DISTRIBUTIONS-OF-INCOME>       448,127       484,000         520,874
  <DISTRIBUTIONS-OF-GAINS>              0       0               0 
  <DISTRIBUTIONS-OTHER>            16,137       18,315          15,855
  <NUMBER-OF-SHARES-SOLD>               0       0               0 
  <NUMBER-OF-SHARES-REDEEMED>         524       446             319
  <SHARES-REINVESTED>                   0       0               0 
  <NET-CHANGE-IN-ASSETS>        (521,316)       (460,972)       (247,127)
  <ACCUMULATED-NII-PRIOR>               0       0               0 
  <ACCUMULATED-GAINS-PRIOR>             0       0               0 
  <OVERDISTRIB-NII-PRIOR>               0       0               0 
  <OVERDIST-NET-GAINS-PRIOR>            0       0               0 
  <GROSS-ADVISORY-FEES>                 0       0               0 
  <INTEREST-EXPENSE>                    0       0               0 
  <GROSS-EXPENSE>                       0       0               0 
  <AVERAGE-NET-ASSETS>                  0       0               0 
  <PER-SHARE-NAV-BEGIN>                 0       0               0 
  <PER-SHARE-NII>                       0       0               0 
  <PER-SHARE-GAIN-APPREC>               0       0               0 
  <PER-SHARE-DIVIDEND>                  0       0               0 
  <PER-SHARE-DISTRIBUTIONS>             0       0               0 
  <RETURNS-OF-CAPITAL>                  0       0               0 
  <PER-SHARE-NAV-END>               1,066       0               0 
  <EXPENSE-RATIO>                       0       0               0 
  <AVG-DEBT-OUTSTANDING>                0       0               0 
  <AVG-DEBT-PER-SHARE>                  0       0               0 
                                        
  
</TABLE>