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<PAGE> PAGE 2
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<PAGE> PAGE 3
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<PAGE> PAGE 4
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<PAGE> PAGE 5
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<PAGE> PAGE 6
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<PAGE> PAGE 7
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<PAGE> PAGE 8
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<PAGE> PAGE 9
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<PAGE> PAGE 10
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<PAGE> PAGE 11
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<PAGE> PAGE 12
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<PAGE> PAGE 13
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SIGNATURE THOMAS G. ROSE
TITLE TREASURER
WARNING: THE EDGAR SYSTEM ENCOUNTERED ERROR(S) WHILE PROCESSING THIS SCHEDULE.
<TABLE> <S> <C>
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<SERIES>
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<NAME> SELIGMAN HIGH-YIELD BOND SERIES CL. A
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<FN>
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WARNING: THE EDGAR SYSTEM ENCOUNTERED ERROR(S) WHILE PROCESSING THIS SCHEDULE.
<TABLE> <S> <C>
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<SERIES>
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<NAME> SELIGMAN HIGH-YIELD BOND SERIES CL. B
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<S> <C>
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<FN>
<F1>Class B only. All other data are fund level.
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WARNING: THE EDGAR SYSTEM ENCOUNTERED ERROR(S) WHILE PROCESSING THIS SCHEDULE.
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<NAME> SELIGMAN HIGH-YIELD BOND SERIES CL. C
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<PER-SHARE-DISTRIBUTIONS> 0<F1>
<RETURNS-OF-CAPITAL> 0<F1>
<PER-SHARE-NAV-END> 6.65<F1>
<EXPENSE-RATIO> 1.63<F1>
[AVG-DEBT-OUTSTANDING] 0
[AVG-DEBT-PER-SHARE] 0
<FN>
<F1>Class C only. All other data are fund level.
</FN>
</TABLE>
WARNING: THE EDGAR SYSTEM ENCOUNTERED ERROR(S) WHILE PROCESSING THIS SCHEDULE.
<TABLE> <S> <C>
<ARTICLE> 6
<SERIES>
<NUMBER> 304
<NAME> SELIGMAN HIGH-YIELD BOND SERIES CL. D
<MULTIPLIER> 1000
<S> <C>
<PERIOD-TYPE> 6-MOS
<FISCAL-YEAR-END> DEC-31-1999
<PERIOD-END> JUN-30-1999
<INVESTMENTS-AT-COST> 3188498
<INVESTMENTS-AT-VALUE> 2965054
<RECEIVABLES> 113962
<ASSETS-OTHER> 347
<OTHER-ITEMS-ASSETS> 0
<TOTAL-ASSETS> 3079363
<PAYABLE-FOR-SECURITIES> 0
<SENIOR-LONG-TERM-DEBT> 0
<OTHER-ITEMS-LIABILITIES> 40477
<TOTAL-LIABILITIES> 40477
<SENIOR-EQUITY> 0
<PAID-IN-CAPITAL-COMMON> 3316792
<SHARES-COMMON-STOCK> 121582<F1>
<SHARES-COMMON-PRIOR> 110768<F1>
<ACCUMULATED-NII-CURRENT> 4630
<OVERDISTRIBUTION-NII> 0
<ACCUMULATED-NET-GAINS> (59092)
<OVERDISTRIBUTION-GAINS> 0
<ACCUM-APPREC-OR-DEPREC> (223444)
<NET-ASSETS> 808650<F1>
<DIVIDEND-INCOME> 0<F1>
<INTEREST-INCOME> 40900<F1>
<OTHER-INCOME> 0
<EXPENSES-NET> (7326)<F1>
<NET-INVESTMENT-INCOME> 37744<F1>
<REALIZED-GAINS-CURRENT> (56304)
<APPREC-INCREASE-CURRENT> (79026)
<NET-CHANGE-FROM-OPS> 8856
<EQUALIZATION> 0
<DISTRIBUTIONS-OF-INCOME> (37762)<F1>
<DISTRIBUTIONS-OF-GAINS> 0<F1>
<DISTRIBUTIONS-OTHER> 0
<NUMBER-OF-SHARES-SOLD> 25764<F1>
<NUMBER-OF-SHARES-REDEEMED> (18268)<F1>
<SHARES-REINVESTED> 3318<F1>
<NET-CHANGE-IN-ASSETS> 180724
<ACCUMULATED-NII-PRIOR> 4786
<ACCUMULATED-GAINS-PRIOR> (2788)
<OVERDISTRIB-NII-PRIOR> 0
<OVERDIST-NET-GAINS-PRIOR> 0
<GROSS-ADVISORY-FEES> 2351<F1>
<INTEREST-EXPENSE> 0
<GROSS-EXPENSE> 7326<F1>
<AVERAGE-NET-ASSETS> 812960<F1>
<PER-SHARE-NAV-BEGIN> 6.95<F1>
<PER-SHARE-NII> .32<F1>
<PER-SHARE-GAIN-APPREC> (.30)<F1>
<PER-SHARE-DIVIDEND> (.32)<F1>
<PER-SHARE-DISTRIBUTIONS> 0<F1>
<RETURNS-OF-CAPITAL> 0<F1>
<PER-SHARE-NAV-END> 6.65<F1>
<EXPENSE-RATIO> 1.82<F1>
[AVG-DEBT-OUTSTANDING] 0
[AVG-DEBT-PER-SHARE] 0
<FN>
<F1>Class D only. All other data are fund level.
</FN>
</TABLE>
WARNING: THE EDGAR SYSTEM ENCOUNTERED ERROR(S) WHILE PROCESSING THIS SCHEDULE.
<TABLE> <S> <C>
<ARTICLE> 6
<SERIES>
<NUMBER> 101
<NAME> SELIGMAN U.S.GOVERNMENT SECURITIES SERIES CLASS A
<MULTIPLIER> 1000
<S> <C>
<PERIOD-TYPE> 6-MOS
<FISCAL-YEAR-END> DEC-31-1999
<PERIOD-END> JUN-30-1999
<INVESTMENTS-AT-COST> 89007
<INVESTMENTS-AT-VALUE> 86194
<RECEIVABLES> 1297
<ASSETS-OTHER> 83
<OTHER-ITEMS-ASSETS> 0
<TOTAL-ASSETS> 87574
<PAYABLE-FOR-SECURITIES> 0
<SENIOR-LONG-TERM-DEBT> 0
<OTHER-ITEMS-LIABILITIES> 1616
<TOTAL-LIABILITIES> 1616
<SENIOR-EQUITY> 0
<PAID-IN-CAPITAL-COMMON> 99087
<SHARES-COMMON-STOCK> 6828<F1>
<SHARES-COMMON-PRIOR> 7828<F1>
<ACCUMULATED-NII-CURRENT> 0
<OVERDISTRIBUTION-NII> 0
<ACCUMULATED-NET-GAINS> (10316)
<OVERDISTRIBUTION-GAINS> 0
<ACCUM-APPREC-OR-DEPREC> (2813)
<NET-ASSETS> 45672<F1>
<DIVIDEND-INCOME> 0
<INTEREST-INCOME> 1611<F1>
<OTHER-INCOME> 0
<EXPENSES-NET> (318)<F1>
<NET-INVESTMENT-INCOME> 1293<F1>
<REALIZED-GAINS-CURRENT> 689
<APPREC-INCREASE-CURRENT> (5196)
<NET-CHANGE-FROM-OPS> (3645)
<EQUALIZATION> 0
<DISTRIBUTIONS-OF-INCOME> (1293)<F1>
<DISTRIBUTIONS-OF-GAINS> 0
<DISTRIBUTIONS-OTHER> 0
<NUMBER-OF-SHARES-SOLD> 21659<F1>
<NUMBER-OF-SHARES-REDEEMED> (22771)<F1>
<SHARES-REINVESTED> 112<F1>
<NET-CHANGE-IN-ASSETS> (24082)
<ACCUMULATED-NII-PRIOR> 0
<ACCUMULATED-GAINS-PRIOR> (9626)
<OVERDISTRIB-NII-PRIOR> 0
<OVERDIST-NET-GAINS-PRIOR> 0
<GROSS-ADVISORY-FEES> 135<F1>
<INTEREST-EXPENSE> 0
<GROSS-EXPENSE> 318<F1>
<AVERAGE-NET-ASSETS> 54568<F1>
<PER-SHARE-NAV-BEGIN> 7.09<F1>
<PER-SHARE-NII> .16<F1>
<PER-SHARE-GAIN-APPREC> (.40)<F1>
<PER-SHARE-DIVIDEND> (.16)<F1>
<PER-SHARE-DISTRIBUTIONS> 0<F1>
<RETURNS-OF-CAPITAL> 0<F1>
<PER-SHARE-NAV-END> 6.69<F1>
<EXPENSE-RATIO> 1.18<F1>
[AVG-DEBT-OUTSTANDING] 0
[AVG-DEBT-PER-SHARE] 0
<FN>
<F1>Class A only. All other data are fund level.
</FN>
</TABLE>
WARNING: THE EDGAR SYSTEM ENCOUNTERED ERROR(S) WHILE PROCESSING THIS SCHEDULE.
<TABLE> <S> <C>
<ARTICLE> 6
<SERIES>
<NUMBER> 102
<NAME> SELIGMAN U.S.GOVERNMENT SECURITIES SERIES CLASS B
<MULTIPLIER> 1000
<S> <C>
<PERIOD-TYPE> 6-MOS
<FISCAL-YEAR-END> DEC-31-1999
<PERIOD-END> JUN-30-1999
<INVESTMENTS-AT-COST> 89007
<INVESTMENTS-AT-VALUE> 86194
<RECEIVABLES> 1297
<ASSETS-OTHER> 83
<OTHER-ITEMS-ASSETS> 0
<TOTAL-ASSETS> 87574
<PAYABLE-FOR-SECURITIES> 0
<SENIOR-LONG-TERM-DEBT> 0
<OTHER-ITEMS-LIABILITIES> 1616
<TOTAL-LIABILITIES> 1616
<SENIOR-EQUITY> 0
<PAID-IN-CAPITAL-COMMON> 99087
<SHARES-COMMON-STOCK> 3229<F1>
<SHARES-COMMON-PRIOR> 3929<F1>
<ACCUMULATED-NII-CURRENT> 0
<OVERDISTRIBUTION-NII> 0
<ACCUMULATED-NET-GAINS> (10316)
<OVERDISTRIBUTION-GAINS> 0
<ACCUM-APPREC-OR-DEPREC> (2813)
<NET-ASSETS> 21641<F1>
<DIVIDEND-INCOME> 0
<INTEREST-INCOME> 718<F1>
<OTHER-INCOME> 0
<EXPENSES-NET> (233)<F1>
<NET-INVESTMENT-INCOME> 485<F1>
<REALIZED-GAINS-CURRENT> (689)
<APPREC-INCREASE-CURRENT> (5196)
<NET-CHANGE-FROM-OPS> (3645)
<EQUALIZATION> 0
<DISTRIBUTIONS-OF-INCOME> (485)<F1>
<DISTRIBUTIONS-OF-GAINS> 0
<DISTRIBUTIONS-OTHER> 0
<NUMBER-OF-SHARES-SOLD> 1421<F1>
<NUMBER-OF-SHARES-REDEEMED> (2166)<F1>
<SHARES-REINVESTED> 45<F1>
<NET-CHANGE-IN-ASSETS> (24082)
<ACCUMULATED-NII-PRIOR> 0
<ACCUMULATED-GAINS-PRIOR> (9626)
<OVERDISTRIB-NII-PRIOR> 0
<OVERDIST-NET-GAINS-PRIOR> 0
<GROSS-ADVISORY-FEES> 60<F1>
<INTEREST-EXPENSE> 0
<GROSS-EXPENSE> 233<F1>
<AVERAGE-NET-ASSETS> 24302<F1>
<PER-SHARE-NAV-BEGIN> 7.11<F1>
<PER-SHARE-NII> .14<F1>
<PER-SHARE-GAIN-APPREC> (.41)<F1>
<PER-SHARE-DIVIDEND> (.14)<F1>
<PER-SHARE-DISTRIBUTIONS> 0<F1>
<RETURNS-OF-CAPITAL> 0<F1>
<PER-SHARE-NAV-END> 6.70<F1>
<EXPENSE-RATIO> 1.93<F1>
[AVG-DEBT-OUTSTANDING] 0
[AVG-DEBT-PER-SHARE] 0
<FN>
<F1>Class B only. All other data are fund level.
</FN>
</TABLE>
WARNING: THE EDGAR SYSTEM ENCOUNTERED ERROR(S) WHILE PROCESSING THIS SCHEDULE.
<TABLE> <S> <C>
<ARTICLE> 6
<SERIES>
<NUMBER> 103
<NAME> SELIGMAN U.S.GOVERNMENT SECURITIES SERIES CLASS C
<MULTIPLIER> 1000
<S> <C>
<PERIOD-TYPE> 6-MOS
<FISCAL-YEAR-END> DEC-31-1999
<PERIOD-END> JUN-30-1999
<INVESTMENTS-AT-COST> 89007
<INVESTMENTS-AT-VALUE> 86194
<RECEIVABLES> 1297
<ASSETS-OTHER> 83
<OTHER-ITEMS-ASSETS> 0
<TOTAL-ASSETS> 87574
<PAYABLE-FOR-SECURITIES> 0
<SENIOR-LONG-TERM-DEBT> 0
<OTHER-ITEMS-LIABILITIES> 1616
<TOTAL-LIABILITIES> 1616
<SENIOR-EQUITY> 0
<PAID-IN-CAPITAL-COMMON> 99087
<SHARES-COMMON-STOCK> 40<F1>
<SHARES-COMMON-PRIOR> 0<F1>
<ACCUMULATED-NII-CURRENT> 0
<OVERDISTRIBUTION-NII> 0
<ACCUMULATED-NET-GAINS> (10316)
<OVERDISTRIBUTION-GAINS> 0
<ACCUM-APPREC-OR-DEPREC> (2813)
<NET-ASSETS> 270<F1>
<DIVIDEND-INCOME> 0
<INTEREST-INCOME> 1<F1>
<OTHER-INCOME> 0
<EXPENSES-NET> 0<F1>
<NET-INVESTMENT-INCOME> 1<F1>
<REALIZED-GAINS-CURRENT> (689)
<APPREC-INCREASE-CURRENT> (5196)
<NET-CHANGE-FROM-OPS> (3645)
<EQUALIZATION> 0
<DISTRIBUTIONS-OF-INCOME> (1)<F1>
<DISTRIBUTIONS-OF-GAINS> 0
<DISTRIBUTIONS-OTHER> 0
<NUMBER-OF-SHARES-SOLD> 40<F1>
<NUMBER-OF-SHARES-REDEEMED> 0<F1>
<SHARES-REINVESTED> 0<F1>
<NET-CHANGE-IN-ASSETS> (24082)
<ACCUMULATED-NII-PRIOR> 0
<ACCUMULATED-GAINS-PRIOR> (9626)
<OVERDISTRIB-NII-PRIOR> 0
<OVERDIST-NET-GAINS-PRIOR> 0
<GROSS-ADVISORY-FEES> 0<F1>
<INTEREST-EXPENSE> 0
<GROSS-EXPENSE> 0<F1>
<AVERAGE-NET-ASSETS> 118<F1>
<PER-SHARE-NAV-BEGIN> 6.78<F1>
<PER-SHARE-NII> .03<F1>
<PER-SHARE-GAIN-APPREC> (.08)<F1>
<PER-SHARE-DIVIDEND> (.03)<F1>
<PER-SHARE-DISTRIBUTIONS> 0<F1>
<RETURNS-OF-CAPITAL> 0<F1>
<PER-SHARE-NAV-END> 6.70<F1>
<EXPENSE-RATIO> 2.40<F1>
[AVG-DEBT-OUTSTANDING] 0
[AVG-DEBT-PER-SHARE] 0
<FN>
<F1>Class C only. All other data are fund level.
</FN>
</TABLE>
WARNING: THE EDGAR SYSTEM ENCOUNTERED ERROR(S) WHILE PROCESSING THIS SCHEDULE.
<TABLE> <S> <C>
<ARTICLE> 6
<SERIES>
<NUMBER> 104
<NAME> SELIGMAN U.S.GOVERNMENT SECURITIES SERIES CLASS D
<MULTIPLIER> 1000
<S> <C>
<PERIOD-TYPE> 6-MOS
<FISCAL-YEAR-END> DEC-31-1999
<PERIOD-END> JUN-30-1999
<INVESTMENTS-AT-COST> 89007
<INVESTMENTS-AT-VALUE> 86194
<RECEIVABLES> 1297
<ASSETS-OTHER> 83
<OTHER-ITEMS-ASSETS> 0
<TOTAL-ASSETS> 87574
<PAYABLE-FOR-SECURITIES> 0
<SENIOR-LONG-TERM-DEBT> 0
<OTHER-ITEMS-LIABILITIES> 1616
<TOTAL-LIABILITIES> 1616
<SENIOR-EQUITY> 0
<PAID-IN-CAPITAL-COMMON> 99087
<SHARES-COMMON-STOCK> 2741<F1>
<SHARES-COMMON-PRIOR> 3745<F1>
<ACCUMULATED-NII-CURRENT> 0
<OVERDISTRIBUTION-NII> 0
<ACCUMULATED-NET-GAINS> (10316)
<OVERDISTRIBUTION-GAINS> 0
<ACCUM-APPREC-OR-DEPREC> (2813)
<NET-ASSETS> 18375<F1>
<DIVIDEND-INCOME> 0
<INTEREST-INCOME> 680<F1>
<OTHER-INCOME> 0
<EXPENSES-NET> (219)<F1>
<NET-INVESTMENT-INCOME> 461<F1>
<REALIZED-GAINS-CURRENT> (689)
<APPREC-INCREASE-CURRENT> (5196)
<NET-CHANGE-FROM-OPS> (3645)
<EQUALIZATION> 0
<DISTRIBUTIONS-OF-INCOME> (461)<F1>
<DISTRIBUTIONS-OF-GAINS> 0
<DISTRIBUTIONS-OTHER> 0
<NUMBER-OF-SHARES-SOLD> 2343<F1>
<NUMBER-OF-SHARES-REDEEMED> (3400)<F1>
<SHARES-REINVESTED> 53<F1>
<NET-CHANGE-IN-ASSETS> (24082)
<ACCUMULATED-NII-PRIOR> 0
<ACCUMULATED-GAINS-PRIOR> (9626)
<OVERDISTRIB-NII-PRIOR> 0
<OVERDIST-NET-GAINS-PRIOR> 0
<GROSS-ADVISORY-FEES> 57<F1>
<INTEREST-EXPENSE> 0
<GROSS-EXPENSE> 219<F1>
<AVERAGE-NET-ASSETS> 22922<F1>
<PER-SHARE-NAV-BEGIN> 7.11<F1>
<PER-SHARE-NII> .14<F1>
<PER-SHARE-GAIN-APPREC> (.41)<F1>
<PER-SHARE-DIVIDEND> (.14)<F1>
<PER-SHARE-DISTRIBUTIONS> 0<F1>
<RETURNS-OF-CAPITAL> 0<F1>
<PER-SHARE-NAV-END> 6.70<F1>
<EXPENSE-RATIO> 1.93<F1>
[AVG-DEBT-OUTSTANDING] 0
[AVG-DEBT-PER-SHARE] 0
<FN>
<F1>Class D only. All other data are fund level.
</FN>
</TABLE>
