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<PAGE> PAGE 2
012 C03AA01 10017
013 A00AA01 DELOITTE & TOUCHE LLP
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<PAGE> PAGE 3
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<PAGE> PAGE 4
050 00AA00 N
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<PAGE> PAGE 5
028 A040100 2827
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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
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<SERIES>
<NUMBER> 011
<NAME> SELIGMAN U.S.GOVERNMENT SECURITIES SERIES CLASS A
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<S> <C>
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<F1>Class A only. All other data are fund level.
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<NUMBER> 012
<NAME> SELIGMAN U.S.GOVERNMENT SECURITIES SERIES CLASS 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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<NAME> SELIGMAN U.S.GOVERNMENT SECURITIES SERIES CLASS D
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<PER-SHARE-DIVIDEND> (.16)<F1>
<PER-SHARE-DISTRIBUTIONS> 0<F1>
<RETURNS-OF-CAPITAL> 0<F1>
<PER-SHARE-NAV-END> 6.96<F1>
<EXPENSE-RATIO> 1.92<F1>
<AVG-DEBT-OUTSTANDING> 0
<AVG-DEBT-PER-SHARE> 0
<FN>
<F1>Class D only. All other data are fund level.
</FN>
</TABLE>
<TABLE> <S> <C>
<ARTICLE> 6
<SERIES>
<NUMBER> 031
<NAME> SELIGMAN HIGH-YIELD BOND SERIES CL. A
<MULTIPLIER> 1000
<S> <C>
<PERIOD-TYPE> 6-MOS
<FISCAL-YEAR-END> DEC-31-1998
<PERIOD-END> JUN-30-1998
<INVESTMENTS-AT-COST> 2452839
<INVESTMENTS-AT-VALUE> 2527025
<RECEIVABLES> 91573
<ASSETS-OTHER> 4223
<OTHER-ITEMS-ASSETS> 0
<TOTAL-ASSETS> 2622821
<PAYABLE-FOR-SECURITIES> 31640
<SENIOR-LONG-TERM-DEBT> 0
<OTHER-ITEMS-LIABILITIES> 23294
<TOTAL-LIABILITIES> 54934
<SENIOR-EQUITY> 0
<PAID-IN-CAPITAL-COMMON> 2479920
<SHARES-COMMON-STOCK> 128589<F1>
<SHARES-COMMON-PRIOR> 99415<F1>
<ACCUMULATED-NII-CURRENT> 3043
<OVERDISTRIBUTION-NII> 0
<ACCUMULATED-NET-GAINS> 10738
<OVERDISTRIBUTION-GAINS> 0
<ACCUM-APPREC-OR-DEPREC> 74186
<NET-ASSETS> 979091<F1>
<DIVIDEND-INCOME> 2200<F1>
<INTEREST-INCOME> 41777<F1>
<OTHER-INCOME> 0
<EXPENSES-NET> (4675)<F1>
<NET-INVESTMENT-INCOME> 39302<F1>
<REALIZED-GAINS-CURRENT> 12398
<APPREC-INCREASE-CURRENT> 4359
<NET-CHANGE-FROM-OPS> 111854
<EQUALIZATION> 0
<DISTRIBUTIONS-OF-INCOME> (38988)<F1>
<DISTRIBUTIONS-OF-GAINS> (2686)<F1>
<DISTRIBUTIONS-OTHER> 0
<NUMBER-OF-SHARES-SOLD> 69967<F1>
<NUMBER-OF-SHARES-REDEEMED> (43848)<F1>
<SHARES-REINVESTED> 3055<F1>
<NET-CHANGE-IN-ASSETS> 701194
<ACCUMULATED-NII-PRIOR> 2353
<ACCUMULATED-GAINS-PRIOR> 5297
<OVERDISTRIB-NII-PRIOR> 0
<OVERDIST-NET-GAINS-PRIOR> 0
<GROSS-ADVISORY-FEES> 2606<F1>
<INTEREST-EXPENSE> 0
<GROSS-EXPENSE> 4675<F1>
<AVERAGE-NET-ASSETS> 883344<F1>
<PER-SHARE-NAV-BEGIN> 7.55<F1>
<PER-SHARE-NII> .34<F1>
<PER-SHARE-GAIN-APPREC> .08<F1>
<PER-SHARE-DIVIDEND> (.34)<F1>
<PER-SHARE-DISTRIBUTIONS> (.02)<F1>
<RETURNS-OF-CAPITAL> 0<F1>
<PER-SHARE-NAV-END> 7.61<F1>
<EXPENSE-RATIO> 1.07<F1>
<AVG-DEBT-OUTSTANDING> 0
<AVG-DEBT-PER-SHARE> 0
<FN>
<F1>Class A only. All other data are fund level.
</FN>
</TABLE>
<TABLE> <S> <C>
<ARTICLE> 6
<SERIES>
<NUMBER> 032
<NAME> SELIGMAN HIGH-YIELD BOND SERIES CL. B
<MULTIPLIER> 1000
<S> <C>
<PERIOD-TYPE> 6-MOS
<FISCAL-YEAR-END> DEC-31-1998
<PERIOD-END> JUN-30-1998
<INVESTMENTS-AT-COST> 2452839
<INVESTMENTS-AT-VALUE> 2527025
<RECEIVABLES> 91573
<ASSETS-OTHER> 4223
<OTHER-ITEMS-ASSETS> 0
<TOTAL-ASSETS> 2622821
<PAYABLE-FOR-SECURITIES> 31640
<SENIOR-LONG-TERM-DEBT> 0
<OTHER-ITEMS-LIABILITIES> 23294
<TOTAL-LIABILITIES> 54934
<SENIOR-EQUITY> 0
<PAID-IN-CAPITAL-COMMON> 2479920
<SHARES-COMMON-STOCK> 114664<F1>
<SHARES-COMMON-PRIOR> 76978<F1>
<ACCUMULATED-NII-CURRENT> 3043
<OVERDISTRIBUTION-NII> 0
<ACCUMULATED-NET-GAINS> 10738
<OVERDISTRIBUTION-GAINS> 0
<ACCUM-APPREC-OR-DEPREC> 74186
<NET-ASSETS> 873057<F1>
<DIVIDEND-INCOME> 1828<F1>
<INTEREST-INCOME> 34853<F1>
<OTHER-INCOME> 0
<EXPENSES-NET> (6645)<F1>
<NET-INVESTMENT-INCOME> 30036<F1>
<REALIZED-GAINS-CURRENT> 12398
<APPREC-INCREASE-CURRENT> 4359
<NET-CHANGE-FROM-OPS> 111854
<EQUALIZATION> 0
<DISTRIBUTIONS-OF-INCOME> (29819)<F1>
<DISTRIBUTIONS-OF-GAINS> (2341)<F1>
<DISTRIBUTIONS-OTHER> 0
<NUMBER-OF-SHARES-SOLD> 40599<F1>
<NUMBER-OF-SHARES-REDEEMED> (4889)<F1>
<SHARES-REINVESTED> 1976<F1>
<NET-CHANGE-IN-ASSETS> 701194
<ACCUMULATED-NII-PRIOR> 2353
<ACCUMULATED-GAINS-PRIOR> 5297
<OVERDISTRIB-NII-PRIOR> 0
<OVERDIST-NET-GAINS-PRIOR> 0
<GROSS-ADVISORY-FEES> 2167<F1>
<INTEREST-EXPENSE> 0
<GROSS-EXPENSE> 6645<F1>
<AVERAGE-NET-ASSETS> 736559<F1>
<PER-SHARE-NAV-BEGIN> 7.55<F1>
<PER-SHARE-NII> .31<F1>
<PER-SHARE-GAIN-APPREC> .08<F1>
<PER-SHARE-DIVIDEND> (.31)<F1>
<PER-SHARE-DISTRIBUTIONS> (.02)<F1>
<RETURNS-OF-CAPITAL> 0<F1>
<PER-SHARE-NAV-END> 7.61<F1>
<EXPENSE-RATIO> 1.82<F1>
<AVG-DEBT-OUTSTANDING> 0
<AVG-DEBT-PER-SHARE> 0
<FN>
<F1>Class B only. All other data are fund level.
</FN>
</TABLE>
<TABLE> <S> <C>
<ARTICLE> 6
<SERIES>
<NUMBER> 034
<NAME> SELIGMAN HIGH-YIELD BOND SERIES CL. D
<MULTIPLIER> 1000
<S> <C>
<PERIOD-TYPE> 6-MOS
<FISCAL-YEAR-END> DEC-31-1998
<PERIOD-END> JUN-30-1998
<INVESTMENTS-AT-COST> 2452839
<INVESTMENTS-AT-VALUE> 2527025
<RECEIVABLES> 91573
<ASSETS-OTHER> 4223
<OTHER-ITEMS-ASSETS> 0
<TOTAL-ASSETS> 2622821
<PAYABLE-FOR-SECURITIES> 31640
<SENIOR-LONG-TERM-DEBT> 0
<OTHER-ITEMS-LIABILITIES> 23294
<TOTAL-LIABILITIES> 54934
<SENIOR-EQUITY> 0
<PAID-IN-CAPITAL-COMMON> 2479920
<SHARES-COMMON-STOCK> 93973<F1>
<SHARES-COMMON-PRIOR> 70847<F1>
<ACCUMULATED-NII-CURRENT> 3043
<OVERDISTRIBUTION-NII> 0
<ACCUMULATED-NET-GAINS> 10738
<OVERDISTRIBUTION-GAINS> 0
<ACCUM-APPREC-OR-DEPREC> 74186
<NET-ASSETS> 715739<F1>
<DIVIDEND-INCOME> 1567<F1>
<INTEREST-INCOME> 29890<F1>
<OTHER-INCOME> 0
<EXPENSES-NET> (5698)<F1>
<NET-INVESTMENT-INCOME> 25759<F1>
<REALIZED-GAINS-CURRENT> 12398
<APPREC-INCREASE-CURRENT> 4359
<NET-CHANGE-FROM-OPS> 111854
<EQUALIZATION> 0
<DISTRIBUTIONS-OF-INCOME> (25600)<F1>
<DISTRIBUTIONS-OF-GAINS> (1930)<F1>
<DISTRIBUTIONS-OTHER> 0
<NUMBER-OF-SHARES-SOLD> 29252<F1>
<NUMBER-OF-SHARES-REDEEMED> (8349)<F1>
<SHARES-REINVESTED> 2223<F1>
<NET-CHANGE-IN-ASSETS> 701194
<ACCUMULATED-NII-PRIOR> 2353
<ACCUMULATED-GAINS-PRIOR> 5297
<OVERDISTRIB-NII-PRIOR> 0
<OVERDIST-NET-GAINS-PRIOR> 0
<GROSS-ADVISORY-FEES> 1864<F1>
<INTEREST-EXPENSE> 0
<GROSS-EXPENSE> 5698<F1>
<AVERAGE-NET-ASSETS> 631810<F1>
<PER-SHARE-NAV-BEGIN> 7.55<F1>
<PER-SHARE-NII> .31<F1>
<PER-SHARE-GAIN-APPREC> .09<F1>
<PER-SHARE-DIVIDEND> (.31)<F1>
<PER-SHARE-DISTRIBUTIONS> (.02)<F1>
<RETURNS-OF-CAPITAL> 0<F1>
<PER-SHARE-NAV-END> 7.62<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>
