WARNING: THE EDGAR SYSTEM ENCOUNTERED ERROR(S) WHILE PROCESSING THIS SCHEDULE.

<TABLE> <S> <C>

<ARTICLE> 6
<CIK> 0000862502
<NAME> U.S. Government Income Fund
<SERIES>
   <NUMBER>006
   <NAME>The Salomon Brothers Investment Series

<S>                             <C>
<PERIOD-TYPE>                  6-MOS
<FISCAL-YEAR-END>                               Dec-31-2000
<PERIOD-END>                                    Jun-30-2000
<INVESTMENTS-AT-COST>                            24,891,016
<INVESTMENTS-AT-VALUE>                           30,593,715
<RECEIVABLES>                                       355,224
<ASSETS-OTHER>                                          399
<OTHER-ITEMS-ASSETS>                                      0
<TOTAL-ASSETS>                                   30,949,338
<PAYABLE-FOR-SECURITIES>                          2,423,000
<SENIOR-LONG-TERM-DEBT>                                   0
<OTHER-ITEMS-LIABILITIES>                         2,430,767
<TOTAL-LIABILITIES>                               4,853,767
<SENIOR-EQUITY>                                           0
<PAID-IN-CAPITAL-COMMON>                         27,098,544
<SHARES-COMMON-STOCK>                               655,249
<SHARES-COMMON-PRIOR>                               586,478
<ACCUMULATED-NII-CURRENT>                            74,042
<OVERDISTRIBUTION-NII>                                    0
<ACCUMULATED-NET-GAINS>                            (648,714)
<OVERDISTRIBUTION-GAINS>                                  0
<ACCUM-APPREC-OR-DEPREC>                           (428,301)
<NET-ASSETS>                                     26,095,571
<DIVIDEND-INCOME>                                         0
<INTEREST-INCOME>                                 1,134,244
<OTHER-INCOME>                                            0
<EXPENSES-NET>                                      197,219
<NET-INVESTMENT-INCOME>                             937,025
<REALIZED-GAINS-CURRENT>                           (273,609)
<APPREC-INCREASE-CURRENT>                           166,013
<NET-CHANGE-FROM-OPS>                               829,429
<EQUALIZATION>                                            0
<DISTRIBUTIONS-OF-INCOME>                           165,904
<DISTRIBUTIONS-OF-GAINS>                                  0
<DISTRIBUTIONS-OTHER>                                     0
<NUMBER-OF-SHARES-SOLD>                           2,167,047
<NUMBER-OF-SHARES-REDEEMED>                       2,107,019
<SHARES-REINVESTED>                                   8,743
<NET-CHANGE-IN-ASSETS>                           (4,429,574)
<ACCUMULATED-NII-PRIOR>                            (106,195)
<ACCUMULATED-GAINS-PRIOR>                          (375,105)
<OVERDISTRIB-NII-PRIOR>                                   0
<OVERDIST-NET-GAINS-PRIOR>                                0
<GROSS-ADVISORY-FEES>                                90,366
<INTEREST-EXPENSE>                                        0
<GROSS-EXPENSE>                                     290,977
<AVERAGE-NET-ASSETS>                              5,550,461
<PER-SHARE-NAV-BEGIN>                                 9.840
<PER-SHARE-NII>                                       0.350
<PER-SHARE-GAIN-APPREC>                              (0.040)
<PER-SHARE-DIVIDEND>                                  0.290
<PER-SHARE-DISTRIBUTIONS>                             0.000
<RETURNS-OF-CAPITAL>                                  0.000
<PER-SHARE-NAV-END>                                   9.860
<EXPENSE-RATIO>                                        0.85



</TABLE>