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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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<PAGE> PAGE 14
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<PAGE> PAGE 16
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<PAGE> PAGE 18
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<PAGE> PAGE 19
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<PAGE> PAGE 20
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072 I000400 260
072 J000400 68
072 K000400 16
072 L000400 60
072 M000400 5
072 N000400 34
072 O000400 0
072 P000400 0
072 Q000400 0
072 R000400 23
072 S000400 6
072 T000400 475
072 U000400 0
<PAGE> PAGE 21
072 V000400 0
072 W000400 5
072 X000400 1836
072 Y000400 0
072 Z000400 -956
072AA000400 8667
072BB000400 7462
072CC010400 8651
072CC020400 0
072DD010400 0
072DD020400 0
072EE000400 0
073 A010400 0.0000
073 A020400 0.0000
073 B000400 0.0000
073 C000400 0.0000
074 A000400 8813
074 B000400 0
074 C000400 0
074 D000400 0
074 E000400 0
074 F000400 171594
074 G000400 0
074 H000400 0
074 I000400 0
074 J000400 1387
074 K000400 108
074 L000400 884
074 M000400 352
074 N000400 183138
074 O000400 1828
074 P000400 174
074 Q000400 0
074 R010400 0
074 R020400 0
074 R030400 0
074 R040400 756
074 S000400 0
074 T000400 180380
074 U010400 12512
074 U020400 7043
074 V010400 8.51
074 V020400 8.42
074 W000400 0.0000
074 X000400 10637
074 Y000400 0
075 A000400 0
075 B000400 178323
076 000400 0.00
028 A010500 8780
028 A020500 0
<PAGE> PAGE 22
028 A030500 0
028 A040500 7019
028 B010500 1700
028 B020500 0
028 B030500 0
028 B040500 1371
028 C010500 10871
028 C020500 0
028 C030500 0
028 C040500 1499
028 D010500 13353
028 D020500 0
028 D030500 0
028 D040500 1772
028 E010500 10460
028 E020500 0
028 E030500 0
028 E040500 3479
028 F010500 10293
028 F020500 0
028 F030500 0
028 F040500 3241
028 G010500 55457
028 G020500 0
028 G030500 0
028 G040500 18381
028 H000500 6850
029 000500 Y
030 A000500 294
030 B000500 4.75
030 C000500 0.00
031 A000500 33
031 B000500 0
032 000500 260
033 000500 1
034 000500 Y
035 000500 26
036 A000500 N
036 B000500 0
042 A000500 0
042 B000500 0
042 C000500 27
042 D000500 73
042 E000500 0
042 F000500 0
042 G000500 0
042 H000500 0
043 000500 204
044 000500 0
045 000500 Y
046 000500 Y
<PAGE> PAGE 23
047 000500 Y
048 000500 1.250
048 A010500 0
048 A020500 0.000
048 B010500 0
048 B020500 0.000
048 C010500 0
048 C020500 0.000
048 D010500 0
048 D020500 0.000
048 E010500 0
048 E020500 0.000
048 F010500 0
048 F020500 0.000
048 G010500 0
048 G020500 0.000
048 H010500 0
048 H020500 0.000
048 I010500 0
048 I020500 0.000
048 J010500 0
048 J020500 0.000
048 K010500 0
048 K020500 0.000
049 000500 N
050 000500 N
051 000500 N
052 000500 N
053 A000500 Y
053 B000500 Y
053 C000500 N
055 A000500 N
055 B000500 N
056 000500 Y
057 000500 N
063 A000500 0
063 B000500 0.0
066 A000500 Y
066 B000500 N
066 C000500 Y
066 D000500 N
066 E000500 N
066 F000500 N
066 G000500 N
067 000500 N
068 A000500 N
068 B000500 Y
069 000500 N
070 A010500 Y
070 A020500 N
070 B010500 N
<PAGE> PAGE 24
070 B020500 N
070 C010500 N
070 C020500 N
070 D010500 N
070 D020500 N
070 E010500 N
070 E020500 N
070 F010500 N
070 F020500 N
070 G010500 N
070 G020500 N
070 H010500 N
070 H020500 N
070 I010500 N
070 I020500 N
070 J010500 Y
070 J020500 Y
070 K010500 Y
070 K020500 Y
070 L010500 Y
070 L020500 Y
070 M010500 Y
070 M020500 Y
070 N010500 Y
070 N020500 N
070 O010500 Y
070 O020500 N
070 P010500 Y
070 P020500 N
070 Q010500 N
070 Q020500 N
070 R010500 Y
070 R020500 N
071 A000500 47383
071 B000500 16909
071 C000500 57140
071 D000500 30
072 A000500 6
072 B000500 131
072 C000500 205
072 D000500 0
072 E000500 -25
072 F000500 379
072 G000500 0
072 H000500 0
072 I000500 99
072 J000500 47
072 K000500 6
072 L000500 74
072 M000500 5
072 N000500 46
<PAGE> PAGE 25
072 O000500 0
072 P000500 0
072 Q000500 0
072 R000500 27
072 S000500 6
072 T000500 204
072 U000500 0
072 V000500 0
072 W000500 2
072 X000500 905
072 Y000500 10
072 Z000500 -584
072AA000500 869
072BB000500 2292
072CC010500 10887
072CC020500 0
072DD010500 0
072DD020500 0
072EE000500 0
073 A010500 0.0000
073 A020500 0.0000
073 B000500 0.0000
073 C000500 0.0000
074 A000500 12325
074 B000500 0
074 C000500 0
074 D000500 0
074 E000500 0
074 F000500 80343
074 G000500 0
074 H000500 0
074 I000500 0
074 J000500 69
074 K000500 50
074 L000500 1268
074 M000500 50
074 N000500 94105
074 O000500 3636
074 P000500 120
074 Q000500 0
074 R010500 0
074 R020500 0
074 R030500 0
074 R040500 323
074 S000500 0
074 T000500 90026
074 U010500 4958
074 U020500 3560
074 V010500 7.99
074 V020500 7.93
074 W000500 0.0000
<PAGE> PAGE 26
074 X000500 6016
074 Y000500 0
075 A000500 0
075 B000500 63623
076 000500 0.00
SIGNATURE THOMAS G. ROSE
TITLE TREASURER
<TABLE> <S> <C>
<ARTICLE> 6
<SERIES>
<NUMBER>011
<NAME> SELIGMAN HENDERSON INTERNATIONAL FUND CLASS A
<MULTIPLIER> 1000
<S> <C>
<PERIOD-TYPE> 6-MOS
<FISCAL-YEAR-END> OCT-31-1997
<PERIOD-END> APR-30-1997
<INVESTMENTS-AT-COST> 81930
<INVESTMENTS-AT-VALUE> 90617
<RECEIVABLES> 1817
<ASSETS-OTHER> 2971
<OTHER-ITEMS-ASSETS> 0
<TOTAL-ASSETS> 95405
<PAYABLE-FOR-SECURITIES> 1051
<SENIOR-LONG-TERM-DEBT> 0
<OTHER-ITEMS-LIABILITIES> 539
<TOTAL-LIABILITIES> 1590
<SENIOR-EQUITY> 0
<PAID-IN-CAPITAL-COMMON> 83637
<SHARES-COMMON-STOCK> 2699<F1>
<SHARES-COMMON-PRIOR> 2970<F1>
<ACCUMULATED-NII-CURRENT> (813)
<OVERDISTRIBUTION-NII> 0
<ACCUMULATED-NET-GAINS> 1912
<OVERDISTRIBUTION-GAINS> 0
<ACCUM-APPREC-OR-DEPREC> 9079
<NET-ASSETS> 46640<F1>
<DIVIDEND-INCOME> 215<F1>
<INTEREST-INCOME> 29<F1>
<OTHER-INCOME> (93)<F1>
<EXPENSES-NET> (451)<F1>
<NET-INVESTMENT-INCOME> (300)<F1>
<REALIZED-GAINS-CURRENT> 3236
<APPREC-INCREASE-CURRENT> 3147
<NET-CHANGE-FROM-OPS> 5581
<EQUALIZATION> 0
<DISTRIBUTIONS-OF-INCOME> 0
<DISTRIBUTIONS-OF-GAINS> (2600)<F1>
<DISTRIBUTIONS-OTHER> 0
<NUMBER-OF-SHARES-SOLD> 1059<F1>
<NUMBER-OF-SHARES-REDEEMED> (1443)<F1>
<SHARES-REINVESTED> 113<F1>
<NET-CHANGE-IN-ASSETS> (7943)
<ACCUMULATED-NII-PRIOR> (11)
<ACCUMULATED-GAINS-PRIOR> 3944
<OVERDISTRIB-NII-PRIOR> 0
<OVERDIST-NET-GAINS-PRIOR> 0
<GROSS-ADVISORY-FEES> 238<F1>
<INTEREST-EXPENSE> 0
<GROSS-EXPENSE> 451<F1>
<AVERAGE-NET-ASSETS> 48005<F1>
<PER-SHARE-NAV-BEGIN> 17.17<F1>
<PER-SHARE-NII> (.08)<F1>
<PER-SHARE-GAIN-APPREC> 1.08<F1>
<PER-SHARE-DIVIDEND> 0
<PER-SHARE-DISTRIBUTIONS> (.89)<F1>
<RETURNS-OF-CAPITAL> 0
<PER-SHARE-NAV-END> 17.28<F1>
<EXPENSE-RATIO> 1.89<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>012
<NAME> SELIGMAN HENDERSON INTERNATIONAL FUND CLASS B
<MULTIPLIER> 1000
<S> <C>
<PERIOD-TYPE> 6-MOS
<FISCAL-YEAR-END> OCT-31-1997
<PERIOD-END> APR-30-1997
<INVESTMENTS-AT-COST> 81930
<INVESTMENTS-AT-VALUE> 90617
<RECEIVABLES> 1817
<ASSETS-OTHER> 2971
<OTHER-ITEMS-ASSETS> 0
<TOTAL-ASSETS> 95405
<PAYABLE-FOR-SECURITIES> 1051
<SENIOR-LONG-TERM-DEBT> 0
<OTHER-ITEMS-LIABILITIES> 539
<TOTAL-LIABILITIES> 1590
<SENIOR-EQUITY> 0
<PAID-IN-CAPITAL-COMMON> 83637
<SHARES-COMMON-STOCK> 280<F1>
<SHARES-COMMON-PRIOR> 170<F1>
<ACCUMULATED-NII-CURRENT> (813)
<OVERDISTRIBUTION-NII> 0
<ACCUMULATED-NET-GAINS> 1912
<OVERDISTRIBUTION-GAINS> 0
<ACCUM-APPREC-OR-DEPREC> 9079
<NET-ASSETS> 4686<F1>
<DIVIDEND-INCOME> 16<F1>
<INTEREST-INCOME> 2<F1>
<OTHER-INCOME> (7)<F1>
<EXPENSES-NET> (48)<F1>
<NET-INVESTMENT-INCOME> (37)<F1>
<REALIZED-GAINS-CURRENT> 3236
<APPREC-INCREASE-CURRENT> 3147
<NET-CHANGE-FROM-OPS> 5581
<EQUALIZATION> 0
<DISTRIBUTIONS-OF-INCOME> 0
<DISTRIBUTIONS-OF-GAINS> (155)<F1>
<DISTRIBUTIONS-OTHER> 0
<NUMBER-OF-SHARES-SOLD> 117<F1>
<NUMBER-OF-SHARES-REDEEMED> (16)<F1>
<SHARES-REINVESTED> 9<F1>
<NET-CHANGE-IN-ASSETS> (7943)
<ACCUMULATED-NII-PRIOR> (11)
<ACCUMULATED-GAINS-PRIOR> 3944
<OVERDISTRIB-NII-PRIOR> 0
<OVERDIST-NET-GAINS-PRIOR> 0
<GROSS-ADVISORY-FEES> 18<F1>
<INTEREST-EXPENSE> 0
<GROSS-EXPENSE> 48<F1>
<AVERAGE-NET-ASSETS> 3624<F1>
<PER-SHARE-NAV-BEGIN> 16.74<F1>
<PER-SHARE-NII> (.14)<F1>
<PER-SHARE-GAIN-APPREC> 1.04<F1>
<PER-SHARE-DIVIDEND> 0
<PER-SHARE-DISTRIBUTIONS> (.89)<F1>
<RETURNS-OF-CAPITAL> 0
<PER-SHARE-NAV-END> 16.75<F1>
<EXPENSE-RATIO> 2.69<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>014
<NAME> SELIGMAN HENDERSON INTERNATIONAL FUND CLASS D
<MULTIPLIER> 1000
<S> <C>
<PERIOD-TYPE> 6-MOS
<FISCAL-YEAR-END> OCT-31-1997
<PERIOD-END> APR-30-1997
<INVESTMENTS-AT-COST> 81930
<INVESTMENTS-AT-VALUE> 90617
<RECEIVABLES> 1817
<ASSETS-OTHER> 2971
<OTHER-ITEMS-ASSETS> 0
<TOTAL-ASSETS> 95405
<PAYABLE-FOR-SECURITIES> 1051
<SENIOR-LONG-TERM-DEBT> 0
<OTHER-ITEMS-LIABILITIES> 539
<TOTAL-LIABILITIES> 1590
<SENIOR-EQUITY> 0
<PAID-IN-CAPITAL-COMMON> 83637
<SHARES-COMMON-STOCK> 2536<F1>
<SHARES-COMMON-PRIOR> 2863<F1>
<ACCUMULATED-NII-CURRENT> (813)
<OVERDISTRIBUTION-NII> 0
<ACCUMULATED-NET-GAINS> 1912
<OVERDISTRIBUTION-GAINS> 0
<ACCUM-APPREC-OR-DEPREC> 9079
<NET-ASSETS> 42489<F1>
<DIVIDEND-INCOME> 204<F1>
<INTEREST-INCOME> 27<F1>
<OTHER-INCOME> (89)<F1>
<EXPENSES-NET> (607)<F1>
<NET-INVESTMENT-INCOME> (465)<F1>
<REALIZED-GAINS-CURRENT> 3236
<APPREC-INCREASE-CURRENT> 3147
<NET-CHANGE-FROM-OPS> 5581
<EQUALIZATION> 0
<DISTRIBUTIONS-OF-INCOME> 0
<DISTRIBUTIONS-OF-GAINS> (2513)<F1>
<DISTRIBUTIONS-OTHER> 0
<NUMBER-OF-SHARES-SOLD> 657<F1>
<NUMBER-OF-SHARES-REDEEMED> (1122)<F1>
<SHARES-REINVESTED> 138<F1>
<NET-CHANGE-IN-ASSETS> (7943)
<ACCUMULATED-NII-PRIOR> (11)
<ACCUMULATED-GAINS-PRIOR> 3944
<OVERDISTRIB-NII-PRIOR> 0
<OVERDIST-NET-GAINS-PRIOR> 0
<GROSS-ADVISORY-FEES> 225<F1>
<INTEREST-EXPENSE> 0
<GROSS-EXPENSE> 607<F1>
<AVERAGE-NET-ASSETS> 45509<F1>
<PER-SHARE-NAV-BEGIN> 16.74<F1>
<PER-SHARE-NII> (.14)<F1>
<PER-SHARE-GAIN-APPREC> 1.04<F1>
<PER-SHARE-DIVIDEND> 0
<PER-SHARE-DISTRIBUTIONS> (.89)<F1>
<RETURNS-OF-CAPITAL> 0
<PER-SHARE-NAV-END> 16.75<F1>
<EXPENSE-RATIO> 2.69<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>021
<NAME> SELIGMAN HENDERSON GLOBAL SMALLER COS FUND CLASS A
<MULTIPLIER> 1000
<S> <C>
<PERIOD-TYPE> 6-MOS
<FISCAL-YEAR-END> OCT-31-1997
<PERIOD-END> APR-30-1997
<INVESTMENTS-AT-COST> 858095
<INVESTMENTS-AT-VALUE> 861176
<RECEIVABLES> 14964
<ASSETS-OTHER> 33100
<OTHER-ITEMS-ASSETS> 0
<TOTAL-ASSETS> 909240
<PAYABLE-FOR-SECURITIES> 5289
<SENIOR-LONG-TERM-DEBT> 0
<OTHER-ITEMS-LIABILITIES> 5938
<TOTAL-LIABILITIES> 11227
<SENIOR-EQUITY> 0
<PAID-IN-CAPITAL-COMMON> 894153
<SHARES-COMMON-STOCK> 27370<F1>
<SHARES-COMMON-PRIOR> 23142<F1>
<ACCUMULATED-NII-CURRENT> (3725)
<OVERDISTRIBUTION-NII> 0
<ACCUMULATED-NET-GAINS> 3436
<OVERDISTRIBUTION-GAINS> 0
<ACCUM-APPREC-OR-DEPREC> 4149
<NET-ASSETS> 386491<F1>
<DIVIDEND-INCOME> 2105<F1>
<INTEREST-INCOME> 381<F1>
<OTHER-INCOME> (117)<F1>
<EXPENSES-NET> (3239)<F1>
<NET-INVESTMENT-INCOME> (870)<F1>
<REALIZED-GAINS-CURRENT> 4302
<APPREC-INCREASE-CURRENT> (24555)
<NET-CHANGE-FROM-OPS> (23971)
<EQUALIZATION> 0
<DISTRIBUTIONS-OF-INCOME> 0
<DISTRIBUTIONS-OF-GAINS> (16938)<F1>
<DISTRIBUTIONS-OTHER> 0
<NUMBER-OF-SHARES-SOLD> 8552<F1>
<NUMBER-OF-SHARES-REDEEMED> (5393)<F1>
<SHARES-REINVESTED> 1069<F1>
<NET-CHANGE-IN-ASSETS> 158209
<ACCUMULATED-NII-PRIOR> (7)
<ACCUMULATED-GAINS-PRIOR> 35628
<OVERDISTRIB-NII-PRIOR> 0
<OVERDIST-NET-GAINS-PRIOR> 0
<GROSS-ADVISORY-FEES> 1884<F1>
<INTEREST-EXPENSE> 0
<GROSS-EXPENSE> 3239<F1>
<AVERAGE-NET-ASSETS> 380539<F1>
<PER-SHARE-NAV-BEGIN> 15.14<F1>
<PER-SHARE-NII> (.03)<F1>
<PER-SHARE-GAIN-APPREC> (.26)<F1>
<PER-SHARE-DIVIDEND> 0
<PER-SHARE-DISTRIBUTIONS> (.73)<F1>
<RETURNS-OF-CAPITAL> 0
<PER-SHARE-NAV-END> 14.12<F1>
<EXPENSE-RATIO> 1.71<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>022
<NAME> SELIGMAN HENDERSON GLOBAL SMALLER COS FUND CLASS B
<MULTIPLIER> 1000
<S> <C>
<PERIOD-TYPE> 6-MOS
<FISCAL-YEAR-END> OCT-31-1997
<PERIOD-END> APR-30-1997
<INVESTMENTS-AT-COST> 858095
<INVESTMENTS-AT-VALUE> 861176
<RECEIVABLES> 14964
<ASSETS-OTHER> 33100
<OTHER-ITEMS-ASSETS> 0
<TOTAL-ASSETS> 909240
<PAYABLE-FOR-SECURITIES> 5289
<SENIOR-LONG-TERM-DEBT> 0
<OTHER-ITEMS-LIABILITIES> 5938
<TOTAL-LIABILITIES> 11227
<SENIOR-EQUITY> 0
<PAID-IN-CAPITAL-COMMON> 894153
<SHARES-COMMON-STOCK> 13165<F1>
<SHARES-COMMON-PRIOR> 7065<F1>
<ACCUMULATED-NII-CURRENT> (3725)
<OVERDISTRIBUTION-NII> 0
<ACCUMULATED-NET-GAINS> 3436
<OVERDISTRIBUTION-GAINS> 0
<ACCUM-APPREC-OR-DEPREC> 4149
<NET-ASSETS> 179667<F1>
<DIVIDEND-INCOME> 834<F1>
<INTEREST-INCOME> 150<F1>
<OTHER-INCOME> (46)<F1>
<EXPENSES-NET> (1846)<F1>
<NET-INVESTMENT-INCOME> (908)<F1>
<REALIZED-GAINS-CURRENT> 4302
<APPREC-INCREASE-CURRENT> (24555)
<NET-CHANGE-FROM-OPS> (23971)
<EQUALIZATION> 0
<DISTRIBUTIONS-OF-INCOME> 0
<DISTRIBUTIONS-OF-GAINS> (5227)<F1>
<DISTRIBUTIONS-OTHER> 0
<NUMBER-OF-SHARES-SOLD> 7074<F1>
<NUMBER-OF-SHARES-REDEEMED> (1310)<F1>
<SHARES-REINVESTED> 336<F1>
<NET-CHANGE-IN-ASSETS> 158209
<ACCUMULATED-NII-PRIOR> (7)
<ACCUMULATED-GAINS-PRIOR> 35628
<OVERDISTRIB-NII-PRIOR> 0
<OVERDIST-NET-GAINS-PRIOR> 0
<GROSS-ADVISORY-FEES> 748<F1>
<INTEREST-EXPENSE> 0
<GROSS-EXPENSE> 1846<F1>
<AVERAGE-NET-ASSETS> 150453<F1>
<PER-SHARE-NAV-BEGIN> 14.72<F1>
<PER-SHARE-NII> (.08)<F1>
<PER-SHARE-GAIN-APPREC> (.26)<F1>
<PER-SHARE-DIVIDEND> 0
<PER-SHARE-DISTRIBUTIONS> (.73)<F1>
<RETURNS-OF-CAPITAL> 0
<PER-SHARE-NAV-END> 13.65<F1>
<EXPENSE-RATIO> 2.47<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>024
<NAME> SELIGMAN HENDERSON GLOBAL SMALLER COS FUND CLASS D
<MULTIPLIER> 1000
<S> <C>
<PERIOD-TYPE> 6-MOS
<FISCAL-YEAR-END> OCT-31-1997
<PERIOD-END> APR-30-1997
<INVESTMENTS-AT-COST> 858095
<INVESTMENTS-AT-VALUE> 861176
<RECEIVABLES> 14964
<ASSETS-OTHER> 33100
<OTHER-ITEMS-ASSETS> 0
<TOTAL-ASSETS> 909240
<PAYABLE-FOR-SECURITIES> 5289
<SENIOR-LONG-TERM-DEBT> 0
<OTHER-ITEMS-LIABILITIES> 5938
<TOTAL-LIABILITIES> 11227
<SENIOR-EQUITY> 0
<PAID-IN-CAPITAL-COMMON> 894153
<SHARES-COMMON-STOCK> 24305<F1>
<SHARES-COMMON-PRIOR> 19400<F1>
<ACCUMULATED-NII-CURRENT> (3725)
<OVERDISTRIBUTION-NII> 0
<ACCUMULATED-NET-GAINS> 3436
<OVERDISTRIBUTION-GAINS> 0
<ACCUM-APPREC-OR-DEPREC> 4149
<NET-ASSETS> 331855<F1>
<DIVIDEND-INCOME> 1778<F1>
<INTEREST-INCOME> 321<F1>
<OTHER-INCOME> (98)<F1>
<EXPENSES-NET> (3941)<F1>
<NET-INVESTMENT-INCOME> (1940)<F1>
<REALIZED-GAINS-CURRENT> 4302
<APPREC-INCREASE-CURRENT> (24555)
<NET-CHANGE-FROM-OPS> (23971)
<EQUALIZATION> 0
<DISTRIBUTIONS-OF-INCOME> 0
<DISTRIBUTIONS-OF-GAINS> (14329)<F1>
<DISTRIBUTIONS-OTHER> 0
<NUMBER-OF-SHARES-SOLD> 6616<F1>
<NUMBER-OF-SHARES-REDEEMED> (2647)<F1>
<SHARES-REINVESTED> 936<F1>
<NET-CHANGE-IN-ASSETS> 158209
<ACCUMULATED-NII-PRIOR> (7)
<ACCUMULATED-GAINS-PRIOR> 35628
<OVERDISTRIB-NII-PRIOR> 0
<OVERDIST-NET-GAINS-PRIOR> 0
<GROSS-ADVISORY-FEES> 1591<F1>
<INTEREST-EXPENSE> 0
<GROSS-EXPENSE> 3941<F1>
<AVERAGE-NET-ASSETS> 321259<F1>
<PER-SHARE-NAV-BEGIN> 14.72<F1>
<PER-SHARE-NII> (.08)<F1>
<PER-SHARE-GAIN-APPREC> (.26)<F1>
<PER-SHARE-DIVIDEND> 0
<PER-SHARE-DISTRIBUTIONS> (.73)<F1>
<RETURNS-OF-CAPITAL> 0
<PER-SHARE-NAV-END> 13.65<F1>
<EXPENSE-RATIO> 2.47<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 HENDERSON GLOBAL TECHNOLOGY FUND CLASS A
<MULTIPLIER> 1000
<S> <C>
<PERIOD-TYPE> 6-MOS
<FISCAL-YEAR-END> OCT-31-1997
<PERIOD-END> APR-30-1997
<INVESTMENTS-AT-COST> 662823
<INVESTMENTS-AT-VALUE> 731005
<RECEIVABLES> 5012
<ASSETS-OTHER> 25383
<OTHER-ITEMS-ASSETS> 0
<TOTAL-ASSETS> 761400
<PAYABLE-FOR-SECURITIES> 0
<SENIOR-LONG-TERM-DEBT> 0
<OTHER-ITEMS-LIABILITIES> 5191
<TOTAL-LIABILITIES> 5191
<SENIOR-EQUITY> 0
<PAID-IN-CAPITAL-COMMON> 653807
<SHARES-COMMON-STOCK> 40269<F1>
<SHARES-COMMON-PRIOR> 44189<F1>
<ACCUMULATED-NII-CURRENT> (5860)
<OVERDISTRIBUTION-NII> 0
<ACCUMULATED-NET-GAINS> 39873
<OVERDISTRIBUTION-GAINS> 0
<ACCUM-APPREC-OR-DEPREC> 68389
<NET-ASSETS> 520090<F1>
<DIVIDEND-INCOME> 957<F1>
<INTEREST-INCOME> 472<F1>
<OTHER-INCOME> (249)<F1>
<EXPENSES-NET> (4601)<F1>
<NET-INVESTMENT-INCOME> (3421)<F1>
<REALIZED-GAINS-CURRENT> 56437
<APPREC-INCREASE-CURRENT> 50366
<NET-CHANGE-FROM-OPS> 100947
<EQUALIZATION> 0
<DISTRIBUTIONS-OF-INCOME> 0<F1>
<DISTRIBUTIONS-OF-GAINS> 0<F1>
<DISTRIBUTIONS-OTHER> 0
<NUMBER-OF-SHARES-SOLD> 7849<F1>
<NUMBER-OF-SHARES-REDEEMED> (11769)<F1>
<SHARES-REINVESTED> 0<F1>
<NET-CHANGE-IN-ASSETS> 40099
<ACCUMULATED-NII-PRIOR> (4)
<ACCUMULATED-GAINS-PRIOR> (16564)
<OVERDISTRIB-NII-PRIOR> 0
<OVERDIST-NET-GAINS-PRIOR> 0
<GROSS-ADVISORY-FEES> 2708<F1>
<INTEREST-EXPENSE> 0
<GROSS-EXPENSE> 4601<F1>
<AVERAGE-NET-ASSETS> 546666<F1>
<PER-SHARE-NAV-BEGIN> 11.31<F1>
<PER-SHARE-NII> (.08)<F1>
<PER-SHARE-GAIN-APPREC> 1.68<F1>
<PER-SHARE-DIVIDEND> 0<F1>
<PER-SHARE-DISTRIBUTIONS> 0<F1>
<RETURNS-OF-CAPITAL> 0
<PER-SHARE-NAV-END> 12.91<F1>
<EXPENSE-RATIO> 1.69<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 HENDERSON GLOBAL TECHNOLOGY FUND CLASS B
<MULTIPLIER> 1000
<S> <C>
<PERIOD-TYPE> 6-MOS
<FISCAL-YEAR-END> OCT-31-1997
<PERIOD-END> APR-30-1997
<INVESTMENTS-AT-COST> 662823
<INVESTMENTS-AT-VALUE> 731005
<RECEIVABLES> 5012
<ASSETS-OTHER> 25383
<OTHER-ITEMS-ASSETS> 0
<TOTAL-ASSETS> 761400
<PAYABLE-FOR-SECURITIES> 0
<SENIOR-LONG-TERM-DEBT> 0
<OTHER-ITEMS-LIABILITIES> 5191
<TOTAL-LIABILITIES> 5191
<SENIOR-EQUITY> 0
<PAID-IN-CAPITAL-COMMON> 653807
<SHARES-COMMON-STOCK> 2565<F1>
<SHARES-COMMON-PRIOR> 1698<F1>
<ACCUMULATED-NII-CURRENT> (5860)
<OVERDISTRIBUTION-NII> 0
<ACCUMULATED-NET-GAINS> 39873
<OVERDISTRIBUTION-GAINS> 0
<ACCUM-APPREC-OR-DEPREC> 68389
<NET-ASSETS> 32373<F1>
<DIVIDEND-INCOME> 50<F1>
<INTEREST-INCOME> 25<F1>
<OTHER-INCOME> (13)<F1>
<EXPENSES-NET> (346)<F1>
<NET-INVESTMENT-INCOME> (284)<F1>
<REALIZED-GAINS-CURRENT> 56437
<APPREC-INCREASE-CURRENT> 50366
<NET-CHANGE-FROM-OPS> 100947
<EQUALIZATION> 0
<DISTRIBUTIONS-OF-INCOME> 0<F1>
<DISTRIBUTIONS-OF-GAINS> 0<F1>
<DISTRIBUTIONS-OTHER> 0
<NUMBER-OF-SHARES-SOLD> 1499<F1>
<NUMBER-OF-SHARES-REDEEMED> (632)<F1>
<SHARES-REINVESTED> 0<F1>
<NET-CHANGE-IN-ASSETS> 40099
<ACCUMULATED-NII-PRIOR> (4)
<ACCUMULATED-GAINS-PRIOR> (16564)
<OVERDISTRIB-NII-PRIOR> 0
<OVERDIST-NET-GAINS-PRIOR> 0
<GROSS-ADVISORY-FEES> 142<F1>
<INTEREST-EXPENSE> 0
<GROSS-EXPENSE> 346<F1>
<AVERAGE-NET-ASSETS> 28585<F1>
<PER-SHARE-NAV-BEGIN> 11.09<F1>
<PER-SHARE-NII> (.12)<F1>
<PER-SHARE-GAIN-APPREC> 1.65<F1>
<PER-SHARE-DIVIDEND> 0<F1>
<PER-SHARE-DISTRIBUTIONS> 0<F1>
<RETURNS-OF-CAPITAL> 0
<PER-SHARE-NAV-END> 12.62<F1>
<EXPENSE-RATIO> 2.44<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 HENDERSON GLOBAL TECHNOLOGY FUND CLASS D
<MULTIPLIER> 1000
<S> <C>
<PERIOD-TYPE> 6-MOS
<FISCAL-YEAR-END> OCT-31-1997
<PERIOD-END> APR-30-1997
<INVESTMENTS-AT-COST> 662823
<INVESTMENTS-AT-VALUE> 731005
<RECEIVABLES> 5012
<ASSETS-OTHER> 25383
<OTHER-ITEMS-ASSETS> 0
<TOTAL-ASSETS> 761400
<PAYABLE-FOR-SECURITIES> 0
<SENIOR-LONG-TERM-DEBT> 0
<OTHER-ITEMS-LIABILITIES> 5191
<TOTAL-LIABILITIES> 5191
<SENIOR-EQUITY> 0
<PAID-IN-CAPITAL-COMMON> 653807
<SHARES-COMMON-STOCK> 16144<F1>
<SHARES-COMMON-PRIOR> 17794<F1>
<ACCUMULATED-NII-CURRENT> (5860)
<OVERDISTRIBUTION-NII> 0
<ACCUMULATED-NET-GAINS> 39873
<OVERDISTRIBUTION-GAINS> 0
<ACCUM-APPREC-OR-DEPREC> 68389
<NET-ASSETS> 203746<F1>
<DIVIDEND-INCOME> 377<F1>
<INTEREST-INCOME> 187<F1>
<OTHER-INCOME> (98)<F1>
<EXPENSES-NET> (2617)<F1>
<NET-INVESTMENT-INCOME> (2151)<F1>
<REALIZED-GAINS-CURRENT> 56437
<APPREC-INCREASE-CURRENT> 50366
<NET-CHANGE-FROM-OPS> 100947
<EQUALIZATION> 0
<DISTRIBUTIONS-OF-INCOME> 0<F1>
<DISTRIBUTIONS-OF-GAINS> 0<F1>
<DISTRIBUTIONS-OTHER> 0
<NUMBER-OF-SHARES-SOLD> 1557<F1>
<NUMBER-OF-SHARES-REDEEMED> (3207)<F1>
<SHARES-REINVESTED> 0<F1>
<NET-CHANGE-IN-ASSETS> 40099
<ACCUMULATED-NII-PRIOR> (4)
<ACCUMULATED-GAINS-PRIOR> (16564)
<OVERDISTRIB-NII-PRIOR> 0
<OVERDIST-NET-GAINS-PRIOR> 0
<GROSS-ADVISORY-FEES> 1071<F1>
<INTEREST-EXPENSE> 0
<GROSS-EXPENSE> 2617<F1>
<AVERAGE-NET-ASSETS> 216159<F1>
<PER-SHARE-NAV-BEGIN> 11.09<F1>
<PER-SHARE-NII> (.12)<F1>
<PER-SHARE-GAIN-APPREC> 1.65<F1>
<PER-SHARE-DIVIDEND> 0<F1>
<PER-SHARE-DISTRIBUTIONS> 0<F1>
<RETURNS-OF-CAPITAL> 0
<PER-SHARE-NAV-END> 12.62<F1>
<EXPENSE-RATIO> 2.44<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>041
<NAME> SELIGMAN HENDERSON GLOBAL GROWTH OPPORTUNITIES FUND CLASS A
<MULTIPLIER> 1000
<S> <C>
<PERIOD-TYPE> 6-MOS
<FISCAL-YEAR-END> OCT-31-1997
<PERIOD-END> APR-30-1997
<INVESTMENTS-AT-COST> 149032
<INVESTMENTS-AT-VALUE> 171594
<RECEIVABLES> 2379
<ASSETS-OTHER> 9165
<OTHER-ITEMS-ASSETS> 0
<TOTAL-ASSETS> 183138
<PAYABLE-FOR-SECURITIES> 1828
<SENIOR-LONG-TERM-DEBT> 0
<OTHER-ITEMS-LIABILITIES> 930
<TOTAL-LIABILITIES> 2758
<SENIOR-EQUITY> 0
<PAID-IN-CAPITAL-COMMON> 157531
<SHARES-COMMON-STOCK> 12512<F1>
<SHARES-COMMON-PRIOR> 13306<F1>
<ACCUMULATED-NII-CURRENT> (958)
<OVERDISTRIBUTION-NII> 0
<ACCUMULATED-NET-GAINS> 940
<OVERDISTRIBUTION-GAINS> 0
<ACCUM-APPREC-OR-DEPREC> 22867
<NET-ASSETS> 106531<F1>
<DIVIDEND-INCOME> 536<F1>
<INTEREST-INCOME> 81<F1>
<OTHER-INCOME> (81)<F1>
<EXPENSES-NET> (959)<F1>
<NET-INVESTMENT-INCOME> (423)<F1>
<REALIZED-GAINS-CURRENT> 1205
<APPREC-INCREASE-CURRENT> 8651
<NET-CHANGE-FROM-OPS> 8900
<EQUALIZATION> 0
<DISTRIBUTIONS-OF-INCOME> 0
<DISTRIBUTIONS-OF-GAINS> 0<F1>
<DISTRIBUTIONS-OTHER> 0
<NUMBER-OF-SHARES-SOLD> 1145<F1>
<NUMBER-OF-SHARES-REDEEMED> (1939)<F1>
<SHARES-REINVESTED> 0<F1>
<NET-CHANGE-IN-ASSETS> 10074
<ACCUMULATED-NII-PRIOR> (2)
<ACCUMULATED-GAINS-PRIOR> (266)
<OVERDISTRIB-NII-PRIOR> 0
<OVERDIST-NET-GAINS-PRIOR> 0
<GROSS-ADVISORY-FEES> 539<F1>
<INTEREST-EXPENSE> 0
<GROSS-EXPENSE> 959<F1>
<AVERAGE-NET-ASSETS> 108785<F1>
<PER-SHARE-NAV-BEGIN> 8.08<F1>
<PER-SHARE-NII> (.02)<F1>
<PER-SHARE-GAIN-APPREC> .45<F1>
<PER-SHARE-DIVIDEND> 0
<PER-SHARE-DISTRIBUTIONS> 0<F1>
<RETURNS-OF-CAPITAL> 0
<PER-SHARE-NAV-END> 8.51<F1>
<EXPENSE-RATIO> 1.78<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>042
<NAME> SELIGMAN HENDERSON GLOBAL GROWTH OPPORTUNITIES FUND CLASS B
<MULTIPLIER> 1000
<S> <C>
<PERIOD-TYPE> 6-MOS
<FISCAL-YEAR-END> OCT-31-1997
<PERIOD-END> APR-30-1997
<INVESTMENTS-AT-COST> 149032
<INVESTMENTS-AT-VALUE> 171594
<RECEIVABLES> 2379
<ASSETS-OTHER> 9165
<OTHER-ITEMS-ASSETS> 0
<TOTAL-ASSETS> 183138
<PAYABLE-FOR-SECURITIES> 1828
<SENIOR-LONG-TERM-DEBT> 0
<OTHER-ITEMS-LIABILITIES> 930
<TOTAL-LIABILITIES> 2758
<SENIOR-EQUITY> 0
<PAID-IN-CAPITAL-COMMON> 157531
<SHARES-COMMON-STOCK> 1732<F1>
<SHARES-COMMON-PRIOR> 1154<F1>
<ACCUMULATED-NII-CURRENT> (958)
<OVERDISTRIBUTION-NII> 0
<ACCUMULATED-NET-GAINS> 940
<OVERDISTRIBUTION-GAINS> 0
<ACCUM-APPREC-OR-DEPREC> 22867
<NET-ASSETS> 14580<F1>
<DIVIDEND-INCOME> 60<F1>
<INTEREST-INCOME> 9<F1>
<OTHER-INCOME> (9)<F1>
<EXPENSES-NET> (152)<F1>
<NET-INVESTMENT-INCOME> (92)<F1>
<REALIZED-GAINS-CURRENT> 1205
<APPREC-INCREASE-CURRENT> 8651
<NET-CHANGE-FROM-OPS> 8900
<EQUALIZATION> 0
<DISTRIBUTIONS-OF-INCOME> 0
<DISTRIBUTIONS-OF-GAINS> 0<F1>
<DISTRIBUTIONS-OTHER> 0
<NUMBER-OF-SHARES-SOLD> 672<F1>
<NUMBER-OF-SHARES-REDEEMED> (94)<F1>
<SHARES-REINVESTED> 0<F1>
<NET-CHANGE-IN-ASSETS> 10074
<ACCUMULATED-NII-PRIOR> (2)
<ACCUMULATED-GAINS-PRIOR> (266)
<OVERDISTRIB-NII-PRIOR> 0
<OVERDIST-NET-GAINS-PRIOR> 0
<GROSS-ADVISORY-FEES> 60<F1>
<INTEREST-EXPENSE> 0
<GROSS-EXPENSE> 152<F1>
<AVERAGE-NET-ASSETS> 12091<F1>
<PER-SHARE-NAV-BEGIN> 8.02<F1>
<PER-SHARE-NII> (.05)<F1>
<PER-SHARE-GAIN-APPREC> .45<F1>
<PER-SHARE-DIVIDEND> 0
<PER-SHARE-DISTRIBUTIONS> 0<F1>
<RETURNS-OF-CAPITAL> 0
<PER-SHARE-NAV-END> 8.42<F1>
<EXPENSE-RATIO> 2.54<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>044
<NAME> SELIGMAN HENDERSON GLOBAL GROWTH OPPORTUNITIES FUND CLASS D
<MULTIPLIER> 1000
<S> <C>
<PERIOD-TYPE> 6-MOS
<FISCAL-YEAR-END> OCT-31-1997
<PERIOD-END> APR-30-1997
<INVESTMENTS-AT-COST> 149032
<INVESTMENTS-AT-VALUE> 171594
<RECEIVABLES> 2379
<ASSETS-OTHER> 9165
<OTHER-ITEMS-ASSETS> 0
<TOTAL-ASSETS> 183138
<PAYABLE-FOR-SECURITIES> 1828
<SENIOR-LONG-TERM-DEBT> 0
<OTHER-ITEMS-LIABILITIES> 930
<TOTAL-LIABILITIES> 2758
<SENIOR-EQUITY> 0
<PAID-IN-CAPITAL-COMMON> 157531
<SHARES-COMMON-STOCK> 7043<F1>
<SHARES-COMMON-PRIOR> 6679<F1>
<ACCUMULATED-NII-CURRENT> (958)
<OVERDISTRIBUTION-NII> 0
<ACCUMULATED-NET-GAINS> 940
<OVERDISTRIBUTION-GAINS> 0
<ACCUM-APPREC-OR-DEPREC> 22867
<NET-ASSETS> 59269<F1>
<DIVIDEND-INCOME> 284<F1>
<INTEREST-INCOME> 43<F1>
<OTHER-INCOME> (43)<F1>
<EXPENSES-NET> (725)<F1>
<NET-INVESTMENT-INCOME> (441)<F1>
<REALIZED-GAINS-CURRENT> 1205
<APPREC-INCREASE-CURRENT> 8651
<NET-CHANGE-FROM-OPS> 8900
<EQUALIZATION> 0
<DISTRIBUTIONS-OF-INCOME> 0
<DISTRIBUTIONS-OF-GAINS> 0<F1>
<DISTRIBUTIONS-OTHER> 0
<NUMBER-OF-SHARES-SOLD> 1255<F1>
<NUMBER-OF-SHARES-REDEEMED> (891)<F1>
<SHARES-REINVESTED> 0<F1>
<NET-CHANGE-IN-ASSETS> 10074
<ACCUMULATED-NII-PRIOR> (2)
<ACCUMULATED-GAINS-PRIOR> (266)
<OVERDISTRIB-NII-PRIOR> 0
<OVERDIST-NET-GAINS-PRIOR> 0
<GROSS-ADVISORY-FEES> 285<F1>
<INTEREST-EXPENSE> 0
<GROSS-EXPENSE> 725<F1>
<AVERAGE-NET-ASSETS> 57614<F1>
<PER-SHARE-NAV-BEGIN> 8.02<F1>
<PER-SHARE-NII> (.05)<F1>
<PER-SHARE-GAIN-APPREC> .45<F1>
<PER-SHARE-DIVIDEND> 0
<PER-SHARE-DISTRIBUTIONS> 0<F1>
<RETURNS-OF-CAPITAL> 0
<PER-SHARE-NAV-END> 8.42<F1>
<EXPENSE-RATIO> 2.54<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>051
<NAME> SELIGMAN HENDERSON EMERGING MARKETS GROWTH FUND CLASS A
<MULTIPLIER> 1000
<S> <C>
<PERIOD-TYPE> 6-MOS
<FISCAL-YEAR-END> OCT-31-1997
<PERIOD-END> APR-30-1997
<INVESTMENTS-AT-COST> 70353
<INVESTMENTS-AT-VALUE> 80343
<RECEIVABLES> 1387
<ASSETS-OTHER> 12375
<OTHER-ITEMS-ASSETS> 0
<TOTAL-ASSETS> 94105
<PAYABLE-FOR-SECURITIES> 3636
<SENIOR-LONG-TERM-DEBT> 0
<OTHER-ITEMS-LIABILITIES> 443
<TOTAL-LIABILITIES> 4079
<SENIOR-EQUITY> 0
<PAID-IN-CAPITAL-COMMON> 82962
<SHARES-COMMON-STOCK> 4958<F1>
<SHARES-COMMON-PRIOR> 2931<F1>
<ACCUMULATED-NII-CURRENT> (585)
<OVERDISTRIBUTION-NII> 0
<ACCUMULATED-NET-GAINS> (2332)
<OVERDISTRIBUTION-GAINS> 0
<ACCUM-APPREC-OR-DEPREC> 9981
<NET-ASSETS> 39596<F1>
<DIVIDEND-INCOME> 91<F1>
<INTEREST-INCOME> 58<F1>
<OTHER-INCOME> (11)<F1>
<EXPENSES-NET> (337)<F1>
<NET-INVESTMENT-INCOME> (201)<F1>
<REALIZED-GAINS-CURRENT> (1423)
<APPREC-INCREASE-CURRENT> 10887
<NET-CHANGE-FROM-OPS> 8880
<EQUALIZATION> 0
<DISTRIBUTIONS-OF-INCOME> 0
<DISTRIBUTIONS-OF-GAINS> 0<F1>
<DISTRIBUTIONS-OTHER> 0
<NUMBER-OF-SHARES-SOLD> 3712<F1>
<NUMBER-OF-SHARES-REDEEMED> (1685)<F1>
<SHARES-REINVESTED> 0<F1>
<NET-CHANGE-IN-ASSETS> 45956
<ACCUMULATED-NII-PRIOR> (1)
<ACCUMULATED-GAINS-PRIOR> (910)
<OVERDISTRIB-NII-PRIOR> 0
<OVERDIST-NET-GAINS-PRIOR> 0
<GROSS-ADVISORY-FEES> 172<F1>
<INTEREST-EXPENSE> 0
<GROSS-EXPENSE> 342<F1>
<AVERAGE-NET-ASSETS> 27918<F1>
<PER-SHARE-NAV-BEGIN> 6.78<F1>
<PER-SHARE-NII> (.05)<F1>
<PER-SHARE-GAIN-APPREC> 1.26<F1>
<PER-SHARE-DIVIDEND> 0
<PER-SHARE-DISTRIBUTIONS> 0
<RETURNS-OF-CAPITAL> 0
<PER-SHARE-NAV-END> 7.99<F1>
<EXPENSE-RATIO> 2.44<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>052
<NAME> SELIGMAN HENDERSON EMERGING MARKETS GROWTH FUND CLASS B
<MULTIPLIER> 1000
<S> <C>
<PERIOD-TYPE> 6-MOS
<FISCAL-YEAR-END> OCT-31-1997
<PERIOD-END> APR-30-1997
<INVESTMENTS-AT-COST> 70353
<INVESTMENTS-AT-VALUE> 80343
<RECEIVABLES> 1387
<ASSETS-OTHER> 12375
<OTHER-ITEMS-ASSETS> 0
<TOTAL-ASSETS> 94105
<PAYABLE-FOR-SECURITIES> 3636
<SENIOR-LONG-TERM-DEBT> 0
<OTHER-ITEMS-LIABILITIES> 443
<TOTAL-LIABILITIES> 4079
<SENIOR-EQUITY> 0
<PAID-IN-CAPITAL-COMMON> 82962
<SHARES-COMMON-STOCK> 2796<F1>
<SHARES-COMMON-PRIOR> 1559<F1>
<ACCUMULATED-NII-CURRENT> (585)
<OVERDISTRIBUTION-NII> 0
<ACCUMULATED-NET-GAINS> (2332)
<OVERDISTRIBUTION-GAINS> 0
<ACCUM-APPREC-OR-DEPREC> 9981
<NET-ASSETS> 22185<F1>
<DIVIDEND-INCOME> 50<F1>
<INTEREST-INCOME> 32<F1>
<OTHER-INCOME> (6)<F1>
<EXPENSES-NET> (244)<F1>
<NET-INVESTMENT-INCOME> (168)<F1>
<REALIZED-GAINS-CURRENT> (1423)
<APPREC-INCREASE-CURRENT> 10887
<NET-CHANGE-FROM-OPS> 8880
<EQUALIZATION> 0
<DISTRIBUTIONS-OF-INCOME> 0
<DISTRIBUTIONS-OF-GAINS> 0<F1>
<DISTRIBUTIONS-OTHER> 0
<NUMBER-OF-SHARES-SOLD> 1386<F1>
<NUMBER-OF-SHARES-REDEEMED> (149)<F1>
<SHARES-REINVESTED> 0<F1>
<NET-CHANGE-IN-ASSETS> 45956
<ACCUMULATED-NII-PRIOR> (1)
<ACCUMULATED-GAINS-PRIOR> (910)
<OVERDISTRIB-NII-PRIOR> 0
<OVERDIST-NET-GAINS-PRIOR> 0
<GROSS-ADVISORY-FEES> 95<F1>
<INTEREST-EXPENSE> 0
<GROSS-EXPENSE> 246<F1>
<AVERAGE-NET-ASSETS> 15252<F1>
<PER-SHARE-NAV-BEGIN> 6.76<F1>
<PER-SHARE-NII> (.08)<F1>
<PER-SHARE-GAIN-APPREC> 1.25<F1>
<PER-SHARE-DIVIDEND> 0
<PER-SHARE-DISTRIBUTIONS> 0
<RETURNS-OF-CAPITAL> 0
<PER-SHARE-NAV-END> 7.93<F1>
<EXPENSE-RATIO> 3.22<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>054
<NAME> SELIGMAN HENDERSON EMERGING MARKETS GROWTH FUND CLASS D
<MULTIPLIER> 1000
<S> <C>
<PERIOD-TYPE> 6-MOS
<FISCAL-YEAR-END> OCT-31-1997
<PERIOD-END> APR-30-1997
<INVESTMENTS-AT-COST> 70353
<INVESTMENTS-AT-VALUE> 80343
<RECEIVABLES> 1387
<ASSETS-OTHER> 12375
<OTHER-ITEMS-ASSETS> 0
<TOTAL-ASSETS> 94105
<PAYABLE-FOR-SECURITIES> 3636
<SENIOR-LONG-TERM-DEBT> 0
<OTHER-ITEMS-LIABILITIES> 443
<TOTAL-LIABILITIES> 4079
<SENIOR-EQUITY> 0
<PAID-IN-CAPITAL-COMMON> 82962
<SHARES-COMMON-STOCK> 3560<F1>
<SHARES-COMMON-PRIOR> 2021<F1>
<ACCUMULATED-NII-CURRENT> (585)
<OVERDISTRIBUTION-NII> 0
<ACCUMULATED-NET-GAINS> (2332)
<OVERDISTRIBUTION-GAINS> 0
<ACCUM-APPREC-OR-DEPREC> 9981
<NET-ASSETS> 28245<F1>
<DIVIDEND-INCOME> 64<F1>
<INTEREST-INCOME> 41<F1>
<OTHER-INCOME> (8)<F1>
<EXPENSES-NET> (313)<F1>
<NET-INVESTMENT-INCOME> (216)<F1>
<REALIZED-GAINS-CURRENT> (1423)
<APPREC-INCREASE-CURRENT> 10887
<NET-CHANGE-FROM-OPS> 8880
<EQUALIZATION> 0
<DISTRIBUTIONS-OF-INCOME> 0
<DISTRIBUTIONS-OF-GAINS> 0<F1>
<DISTRIBUTIONS-OTHER> 0
<NUMBER-OF-SHARES-SOLD> 2198<F1>
<NUMBER-OF-SHARES-REDEEMED> (659)<F1>
<SHARES-REINVESTED> 0<F1>
<NET-CHANGE-IN-ASSETS> 45956
<ACCUMULATED-NII-PRIOR> (1)
<ACCUMULATED-GAINS-PRIOR> (910)
<OVERDISTRIB-NII-PRIOR> 0
<OVERDIST-NET-GAINS-PRIOR> 0
<GROSS-ADVISORY-FEES> 122<F1>
<INTEREST-EXPENSE> 0
<GROSS-EXPENSE> 317<F1>
<AVERAGE-NET-ASSETS> 19645<F1>
<PER-SHARE-NAV-BEGIN> 6.76<F1>
<PER-SHARE-NII> (.08)<F1>
<PER-SHARE-GAIN-APPREC> 1.25<F1>
<PER-SHARE-DIVIDEND> 0
<PER-SHARE-DISTRIBUTIONS> 0
<RETURNS-OF-CAPITAL> 0
<PER-SHARE-NAV-END> 7.93<F1>
<EXPENSE-RATIO> 3.22<F1>
<AVG-DEBT-OUTSTANDING> 0
<AVG-DEBT-PER-SHARE> 0
<FN>
<F1>Class D only. All other data are fund level.
</FN>
</TABLE>
