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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 15
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<PAGE> PAGE 16
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<PAGE> PAGE 19
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072 U000400 0
072 V000400 0
072 W000400 5
072 X000400 1944
072 Y000400 0
072 Z000400 -1139
072AA000400 17755
072BB000400 9316
072CC010400 32096
072CC020400 0
072DD010400 0
072DD020400 0
072EE000400 7682
073 A010400 0.0000
073 A020400 0.0000
073 B000400 0.3700
<PAGE> PAGE 21
073 C000400 0.0000
074 A000400 4030
074 B000400 0
074 C000400 0
074 D000400 0
074 E000400 0
074 F000400 209775
074 G000400 0
074 H000400 0
074 I000400 0
074 J000400 58
074 K000400 71
074 L000400 870
074 M000400 535
074 N000400 215339
074 O000400 359
074 P000400 178
074 Q000400 0
074 R010400 0
074 R020400 0
074 R030400 0
074 R040400 976
074 S000400 0
074 T000400 213826
074 U010400 10942
074 U020400 6853
074 V010400 10.81
074 V020400 10.59
074 W000400 0.0000
074 X000400 11263
074 Y000400 0
075 A000400 0
075 B000400 197087
076 000400 0.00
028 A010500 3418
028 A020500 0
028 A030500 0
028 A040500 5999
028 B010500 7371
028 B020500 0
028 B030500 0
028 B040500 10646
028 C010500 2062
028 C020500 0
028 C030500 0
028 C040500 5453
028 D010500 3865
028 D020500 0
028 D030500 0
028 D040500 4894
028 E010500 2129
<PAGE> PAGE 22
028 E020500 0
028 E030500 0
028 E040500 4585
028 F010500 2649
028 F020500 0
028 F030500 0
028 F040500 4028
028 G010500 21494
028 G020500 0
028 G030500 0
028 G040500 35605
028 H000500 1627
029 000500 Y
030 A000500 69
030 B000500 4.75
030 C000500 0.00
031 A000500 8
031 B000500 0
032 000500 61
033 000500 0
034 000500 Y
035 000500 110
036 A000500 N
036 B000500 0
042 A000500 0
042 B000500 0
042 C000500 32
042 D000500 68
042 E000500 0
042 F000500 0
042 G000500 0
042 H000500 0
043 000500 325
044 000500 0
045 000500 Y
046 000500 Y
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
<PAGE> PAGE 23
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
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
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
<PAGE> PAGE 24
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 38460
071 B000500 39739
071 C000500 87703
071 D000500 44
072 A000500 6
072 B000500 259
072 C000500 334
072 D000500 0
072 E000500 -353
072 F000500 603
072 G000500 0
072 H000500 0
072 I000500 172
072 J000500 60
072 K000500 14
072 L000500 22
072 M000500 9
072 N000500 22
072 O000500 0
072 P000500 0
072 Q000500 0
072 R000500 25
072 S000500 4
072 T000500 325
072 U000500 0
072 V000500 0
072 W000500 3
072 X000500 1259
072 Y000500 0
072 Z000500 -1019
072AA000500 4300
072BB000500 6891
072CC010500 10760
072CC020500 0
072DD010500 0
072DD020500 0
072EE000500 0
073 A010500 0.0000
073 A020500 0.0000
073 B000500 0.0000
<PAGE> PAGE 25
073 C000500 0.0000
074 A000500 5007
074 B000500 0
074 C000500 0
074 D000500 96
074 E000500 0
074 F000500 92727
074 G000500 0
074 H000500 0
074 I000500 0
074 J000500 0
074 K000500 51
074 L000500 420
074 M000500 31
074 N000500 98332
074 O000500 298
074 P000500 102
074 Q000500 0
074 R010500 0
074 R020500 0
074 R030500 0
074 R040500 753
074 S000500 0
074 T000500 97179
074 U010500 5231
074 U020500 3415
074 V010500 7.95
074 V020500 7.83
074 W000500 0.0000
074 X000500 9361
074 Y000500 0
075 A000500 0
075 B000500 97792
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-31-1998
<PERIOD-END> APR-30-1998
<INVESTMENTS-AT-COST> 75407
<INVESTMENTS-AT-VALUE> 98244
<RECEIVABLES> 2881
<ASSETS-OTHER> 343
<OTHER-ITEMS-ASSETS> 0
<TOTAL-ASSETS> 101468
<PAYABLE-FOR-SECURITIES> 1212
<SENIOR-LONG-TERM-DEBT> 0
<OTHER-ITEMS-LIABILITIES> 492
<TOTAL-LIABILITIES> 1704
<SENIOR-EQUITY> 0
<PAID-IN-CAPITAL-COMMON> 75645
<SHARES-COMMON-STOCK> 2435<F1>
<SHARES-COMMON-PRIOR> 2572<F1>
<ACCUMULATED-NII-CURRENT> (301)
<OVERDISTRIBUTION-NII> 0
<ACCUMULATED-NET-GAINS> 1291
<OVERDISTRIBUTION-GAINS> 0
<ACCUM-APPREC-OR-DEPREC> 23129
<NET-ASSETS> 48530<F1>
<DIVIDEND-INCOME> 352<F1>
<INTEREST-INCOME> 40<F1>
<OTHER-INCOME> (21)<F1>
<EXPENSES-NET> (404)<F1>
<NET-INVESTMENT-INCOME> (33)<F1>
<REALIZED-GAINS-CURRENT> 3437
<APPREC-INCREASE-CURRENT> 13523
<NET-CHANGE-FROM-OPS> 16671
<EQUALIZATION> 0
<DISTRIBUTIONS-OF-INCOME> 0
<DISTRIBUTIONS-OF-GAINS> (3074)<F1>
<DISTRIBUTIONS-OTHER> 0
<NUMBER-OF-SHARES-SOLD> 1470<F1>
<NUMBER-OF-SHARES-REDEEMED> (1770)<F1>
<SHARES-REINVESTED> 163<F1>
<NET-CHANGE-IN-ASSETS> 6329
<ACCUMULATED-NII-PRIOR> (12)
<ACCUMULATED-GAINS-PRIOR> 4298
<OVERDISTRIB-NII-PRIOR> 0
<OVERDIST-NET-GAINS-PRIOR> 0
<GROSS-ADVISORY-FEES> 227<F1>
<INTEREST-EXPENSE> 0
<GROSS-EXPENSE> 404<F1>
<AVERAGE-NET-ASSETS> 45669<F1>
<PER-SHARE-NAV-BEGIN> 17.92<F1>
<PER-SHARE-NII> 0<F1>
<PER-SHARE-GAIN-APPREC> 3.23<F1>
<PER-SHARE-DIVIDEND> 0
<PER-SHARE-DISTRIBUTIONS> (1.22)<F1>
<RETURNS-OF-CAPITAL> 0
<PER-SHARE-NAV-END> 19.93<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>012
<NAME> SELIGMAN HENDERSON INTERNATIONAL FUND CLASS B
<MULTIPLIER> 1000
<S> <C>
<PERIOD-TYPE> 6-MOS
<FISCAL-YEAR-END> OCT-31-1998
<PERIOD-END> APR-30-1998
<INVESTMENTS-AT-COST> 75407
<INVESTMENTS-AT-VALUE> 98244
<RECEIVABLES> 2881
<ASSETS-OTHER> 343
<OTHER-ITEMS-ASSETS> 0
<TOTAL-ASSETS> 101468
<PAYABLE-FOR-SECURITIES> 1212
<SENIOR-LONG-TERM-DEBT> 0
<OTHER-ITEMS-LIABILITIES> 492
<TOTAL-LIABILITIES> 1704
<SENIOR-EQUITY> 0
<PAID-IN-CAPITAL-COMMON> 75645
<SHARES-COMMON-STOCK> 467<F1>
<SHARES-COMMON-PRIOR> 367<F1>
<ACCUMULATED-NII-CURRENT> (301)
<OVERDISTRIBUTION-NII> 0
<ACCUMULATED-NET-GAINS> 1291
<OVERDISTRIBUTION-GAINS> 0
<ACCUM-APPREC-OR-DEPREC> 23129
<NET-ASSETS> 8922<F1>
<DIVIDEND-INCOME> 54<F1>
<INTEREST-INCOME> 1<F1>
<OTHER-INCOME> (3)<F1>
<EXPENSES-NET> (89)<F1>
<NET-INVESTMENT-INCOME> (37)<F1>
<REALIZED-GAINS-CURRENT> 3437
<APPREC-INCREASE-CURRENT> 13523
<NET-CHANGE-FROM-OPS> 16671
<EQUALIZATION> 0
<DISTRIBUTIONS-OF-INCOME> 0
<DISTRIBUTIONS-OF-GAINS> (443)<F1>
<DISTRIBUTIONS-OTHER> 0
<NUMBER-OF-SHARES-SOLD> 229<F1>
<NUMBER-OF-SHARES-REDEEMED> (156)<F1>
<SHARES-REINVESTED> 27<F1>
<NET-CHANGE-IN-ASSETS> 6329
<ACCUMULATED-NII-PRIOR> (12)
<ACCUMULATED-GAINS-PRIOR> 4298
<OVERDISTRIB-NII-PRIOR> 0
<OVERDIST-NET-GAINS-PRIOR> 0
<GROSS-ADVISORY-FEES> 35<F1>
<INTEREST-EXPENSE> 0
<GROSS-EXPENSE> 89<F1>
<AVERAGE-NET-ASSETS> 6969<F1>
<PER-SHARE-NAV-BEGIN> 17.30<F1>
<PER-SHARE-NII> (0.08)<F1>
<PER-SHARE-GAIN-APPREC> 3.09<F1>
<PER-SHARE-DIVIDEND> 0
<PER-SHARE-DISTRIBUTIONS> (1.22)<F1>
<RETURNS-OF-CAPITAL> 0
<PER-SHARE-NAV-END> 19.09<F1>
<EXPENSE-RATIO> 2.57<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-31-1998
<PERIOD-END> APR-30-1998
<INVESTMENTS-AT-COST> 75407
<INVESTMENTS-AT-VALUE> 98244
<RECEIVABLES> 2881
<ASSETS-OTHER> 343
<OTHER-ITEMS-ASSETS> 0
<TOTAL-ASSETS> 101468
<PAYABLE-FOR-SECURITIES> 1212
<SENIOR-LONG-TERM-DEBT> 0
<OTHER-ITEMS-LIABILITIES> 492
<TOTAL-LIABILITIES> 1704
<SENIOR-EQUITY> 0
<PAID-IN-CAPITAL-COMMON> 75645
<SHARES-COMMON-STOCK> 2216<F1>
<SHARES-COMMON-PRIOR> 2368<F1>
<ACCUMULATED-NII-CURRENT> (301)
<OVERDISTRIBUTION-NII> 0
<ACCUMULATED-NET-GAINS> 1291
<OVERDISTRIBUTION-GAINS> 0
<ACCUM-APPREC-OR-DEPREC> 23129
<NET-ASSETS> 42312<F1>
<DIVIDEND-INCOME> 313<F1>
<INTEREST-INCOME> 6<F1>
<OTHER-INCOME> (19)<F1>
<EXPENSES-NET> (519)<F1>
<NET-INVESTMENT-INCOME> (219)<F1>
<REALIZED-GAINS-CURRENT> 3437
<APPREC-INCREASE-CURRENT> 13523
<NET-CHANGE-FROM-OPS> 16671
<EQUALIZATION> 0
<DISTRIBUTIONS-OF-INCOME> 0
<DISTRIBUTIONS-OF-GAINS> (2927)<F1>
<DISTRIBUTIONS-OTHER> 0
<NUMBER-OF-SHARES-SOLD> 1043<F1>
<NUMBER-OF-SHARES-REDEEMED> (1356)<F1>
<SHARES-REINVESTED> 161<F1>
<NET-CHANGE-IN-ASSETS> 6329
<ACCUMULATED-NII-PRIOR> (12)
<ACCUMULATED-GAINS-PRIOR> 4298
<OVERDISTRIB-NII-PRIOR> 0
<OVERDIST-NET-GAINS-PRIOR> 0
<GROSS-ADVISORY-FEES> 201<F1>
<INTEREST-EXPENSE> 0
<GROSS-EXPENSE> 519<F1>
<AVERAGE-NET-ASSETS> 40641<F1>
<PER-SHARE-NAV-BEGIN> 17.30<F1>
<PER-SHARE-NII> (0.08)<F1>
<PER-SHARE-GAIN-APPREC> 3.09<F1>
<PER-SHARE-DIVIDEND> 0
<PER-SHARE-DISTRIBUTIONS> (1.22)<F1>
<RETURNS-OF-CAPITAL> 0
<PER-SHARE-NAV-END> 19.09<F1>
<EXPENSE-RATIO> 2.57<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-31-1998
<PERIOD-END> APR-30-1998
<INVESTMENTS-AT-COST> 878704
<INVESTMENTS-AT-VALUE> 1072514
<RECEIVABLES> 19747
<ASSETS-OTHER> 24774
<OTHER-ITEMS-ASSETS> 0
<TOTAL-ASSETS> 1117035
<PAYABLE-FOR-SECURITIES> 6029
<SENIOR-LONG-TERM-DEBT> 0
<OTHER-ITEMS-LIABILITIES> 6176
<TOTAL-LIABILITIES> 12205
<SENIOR-EQUITY> 0
<PAID-IN-CAPITAL-COMMON> 903351
<SHARES-COMMON-STOCK> 25946<F1>
<SHARES-COMMON-PRIOR> 27801<F1>
<ACCUMULATED-NII-CURRENT> (5603)
<OVERDISTRIBUTION-NII> 0
<ACCUMULATED-NET-GAINS> 11509
<OVERDISTRIBUTION-GAINS> 0
<ACCUM-APPREC-OR-DEPREC> 195573
<NET-ASSETS> 450217<F1>
<DIVIDEND-INCOME> 1903<F1>
<INTEREST-INCOME> 249<F1>
<OTHER-INCOME> (89)<F1>
<EXPENSES-NET> (3417)<F1>
<NET-INVESTMENT-INCOME> (1354)<F1>
<REALIZED-GAINS-CURRENT> 17425
<APPREC-INCREASE-CURRENT> 135512
<NET-CHANGE-FROM-OPS> 147344
<EQUALIZATION> 0
<DISTRIBUTIONS-OF-INCOME> 0
<DISTRIBUTIONS-OF-GAINS> (17124)<F1>
<DISTRIBUTIONS-OTHER> 0
<NUMBER-OF-SHARES-SOLD> 8246<F1>
<NUMBER-OF-SHARES-REDEEMED> (11187)<F1>
<SHARES-REINVESTED> 1086<F1>
<NET-CHANGE-IN-ASSETS> 52208
<ACCUMULATED-NII-PRIOR> (10)
<ACCUMULATED-GAINS-PRIOR> 36841
<OVERDISTRIB-NII-PRIOR> 0
<OVERDIST-NET-GAINS-PRIOR> 0
<GROSS-ADVISORY-FEES> 2058<F1>
<INTEREST-EXPENSE> 0
<GROSS-EXPENSE> 3417<F1>
<AVERAGE-NET-ASSETS> 414825<F1>
<PER-SHARE-NAV-BEGIN> 15.62<F1>
<PER-SHARE-NII> (0.05)<F1>
<PER-SHARE-GAIN-APPREC> 2.41<F1>
<PER-SHARE-DIVIDEND> 0
<PER-SHARE-DISTRIBUTIONS> (.63)<F1>
<RETURNS-OF-CAPITAL> 0
<PER-SHARE-NAV-END> 17.35<F1>
<EXPENSE-RATIO> 1.66<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-31-1998
<PERIOD-END> APR-30-1998
<INVESTMENTS-AT-COST> 878704
<INVESTMENTS-AT-VALUE> 1072514
<RECEIVABLES> 19747
<ASSETS-OTHER> 24774
<OTHER-ITEMS-ASSETS> 0
<TOTAL-ASSETS> 1117035
<PAYABLE-FOR-SECURITIES> 6029
<SENIOR-LONG-TERM-DEBT> 0
<OTHER-ITEMS-LIABILITIES> 6176
<TOTAL-LIABILITIES> 12205
<SENIOR-EQUITY> 0
<PAID-IN-CAPITAL-COMMON> 903351
<SHARES-COMMON-STOCK> 16874<F1>
<SHARES-COMMON-PRIOR> 16468<F1>
<ACCUMULATED-NII-CURRENT> (5603)
<OVERDISTRIBUTION-NII> 0
<ACCUMULATED-NET-GAINS> 11509
<OVERDISTRIBUTION-GAINS> 0
<ACCUM-APPREC-OR-DEPREC> 195573
<NET-ASSETS> 280364<F1>
<DIVIDEND-INCOME> 1147<F1>
<INTEREST-INCOME> 150<F1>
<OTHER-INCOME> (53)<F1>
<EXPENSES-NET> (3007)<F1>
<NET-INVESTMENT-INCOME> (1763)<F1>
<REALIZED-GAINS-CURRENT> 17425
<APPREC-INCREASE-CURRENT> 135512
<NET-CHANGE-FROM-OPS> 147344
<EQUALIZATION> 0
<DISTRIBUTIONS-OF-INCOME> 0
<DISTRIBUTIONS-OF-GAINS> (10275)<F1>
<DISTRIBUTIONS-OTHER> 0
<NUMBER-OF-SHARES-SOLD> 1836<F1>
<NUMBER-OF-SHARES-REDEEMED> (2107)<F1>
<SHARES-REINVESTED> 677<F1>
<NET-CHANGE-IN-ASSETS> 52208
<ACCUMULATED-NII-PRIOR> (10)
<ACCUMULATED-GAINS-PRIOR> 36841
<OVERDISTRIB-NII-PRIOR> 0
<OVERDIST-NET-GAINS-PRIOR> 0
<GROSS-ADVISORY-FEES> 1242<F1>
<INTEREST-EXPENSE> 0
<GROSS-EXPENSE> 3007<F1>
<AVERAGE-NET-ASSETS> 250317<F1>
<PER-SHARE-NAV-BEGIN> 15.04<F1>
<PER-SHARE-NII> (0.10)<F1>
<PER-SHARE-GAIN-APPREC> 2.31<F1>
<PER-SHARE-DIVIDEND> 0
<PER-SHARE-DISTRIBUTIONS> (.63)<F1>
<RETURNS-OF-CAPITAL> 0
<PER-SHARE-NAV-END> 16.62<F1>
<EXPENSE-RATIO> 2.42<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-31-1998
<PERIOD-END> APR-30-1998
<INVESTMENTS-AT-COST> 878704
<INVESTMENTS-AT-VALUE> 1072514
<RECEIVABLES> 19747
<ASSETS-OTHER> 24774
<OTHER-ITEMS-ASSETS> 0
<TOTAL-ASSETS> 1117035
<PAYABLE-FOR-SECURITIES> 6029
<SENIOR-LONG-TERM-DEBT> 0
<OTHER-ITEMS-LIABILITIES> 6176
<TOTAL-LIABILITIES> 12205
<SENIOR-EQUITY> 0
<PAID-IN-CAPITAL-COMMON> 903351
<SHARES-COMMON-STOCK> 22513<F1>
<SHARES-COMMON-PRIOR> 24624<F1>
<ACCUMULATED-NII-CURRENT> (5603)
<OVERDISTRIBUTION-NII> 0
<ACCUMULATED-NET-GAINS> 11509
<OVERDISTRIBUTION-GAINS> 0
<ACCUM-APPREC-OR-DEPREC> 195573
<NET-ASSETS> 374249<F1>
<DIVIDEND-INCOME> 1618<F1>
<INTEREST-INCOME> 211<F1>
<OTHER-INCOME> (75)<F1>
<EXPENSES-NET> (4230)<F1>
<NET-INVESTMENT-INCOME> (2476)<F1>
<REALIZED-GAINS-CURRENT> 17425
<APPREC-INCREASE-CURRENT> 135512
<NET-CHANGE-FROM-OPS> 147344
<EQUALIZATION> 0
<DISTRIBUTIONS-OF-INCOME> 0
<DISTRIBUTIONS-OF-GAINS> (15358)<F1>
<DISTRIBUTIONS-OTHER> 0
<NUMBER-OF-SHARES-SOLD> 3801<F1>
<NUMBER-OF-SHARES-REDEEMED> (6921)<F1>
<SHARES-REINVESTED> 1009<F1>
<NET-CHANGE-IN-ASSETS> 52208
<ACCUMULATED-NII-PRIOR> (10)
<ACCUMULATED-GAINS-PRIOR> 36841
<OVERDISTRIB-NII-PRIOR> 0
<OVERDIST-NET-GAINS-PRIOR> 0
<GROSS-ADVISORY-FEES> 1747<F1>
<INTEREST-EXPENSE> 0
<GROSS-EXPENSE> 4230<F1>
<AVERAGE-NET-ASSETS> 352584<F1>
<PER-SHARE-NAV-BEGIN> 15.05<F1>
<PER-SHARE-NII> (0.10)<F1>
<PER-SHARE-GAIN-APPREC> 2.30<F1>
<PER-SHARE-DIVIDEND> 0
<PER-SHARE-DISTRIBUTIONS> (.63)<F1>
<RETURNS-OF-CAPITAL> 0
<PER-SHARE-NAV-END> 16.62<F1>
<EXPENSE-RATIO> 2.42<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-31-1998
<PERIOD-END> APR-30-1998
<INVESTMENTS-AT-COST> 708303
<INVESTMENTS-AT-VALUE> 913325
<RECEIVABLES> 7181
<ASSETS-OTHER> 17223
<OTHER-ITEMS-ASSETS> 0
<TOTAL-ASSETS> 937729
<PAYABLE-FOR-SECURITIES> 0
<SENIOR-LONG-TERM-DEBT> 0
<OTHER-ITEMS-LIABILITIES> 5487
<TOTAL-LIABILITIES> 5487
<SENIOR-EQUITY> 0
<PAID-IN-CAPITAL-COMMON> 709087
<SHARES-COMMON-STOCK> 41535<F1>
<SHARES-COMMON-PRIOR> 38526<F1>
<ACCUMULATED-NII-CURRENT> (5755)
<OVERDISTRIBUTION-NII> 0
<ACCUMULATED-NET-GAINS> 23865
<OVERDISTRIBUTION-GAINS> 0
<ACCUM-APPREC-OR-DEPREC> 205045
<NET-ASSETS> 616166<F1>
<DIVIDEND-INCOME> 769<F1>
<INTEREST-INCOME> 796<F1>
<OTHER-INCOME> 80<F1>
<EXPENSES-NET> (4746)<F1>
<NET-INVESTMENT-INCOME> (3101)<F1>
<REALIZED-GAINS-CURRENT> 27554
<APPREC-INCREASE-CURRENT> 105643
<NET-CHANGE-FROM-OPS> 127448
<EQUALIZATION> 0
<DISTRIBUTIONS-OF-INCOME> 0<F1>
<DISTRIBUTIONS-OF-GAINS> (88902)<F1>
<DISTRIBUTIONS-OTHER> 0
<NUMBER-OF-SHARES-SOLD> 7175<F1>
<NUMBER-OF-SHARES-REDEEMED> (10592)<F1>
<SHARES-REINVESTED> 6426<F1>
<NET-CHANGE-IN-ASSETS> 63057
<ACCUMULATED-NII-PRIOR> (6)
<ACCUMULATED-GAINS-PRIOR> 130196
<OVERDISTRIB-NII-PRIOR> 0
<OVERDIST-NET-GAINS-PRIOR> 0
<GROSS-ADVISORY-FEES> 2833<F1>
<INTEREST-EXPENSE> 0
<GROSS-EXPENSE> 4746<F1>
<AVERAGE-NET-ASSETS> 571326<F1>
<PER-SHARE-NAV-BEGIN> 15.14<F1>
<PER-SHARE-NII> (.07)<F1>
<PER-SHARE-GAIN-APPREC> 2.08<F1>
<PER-SHARE-DIVIDEND> 0<F1>
<PER-SHARE-DISTRIBUTIONS> (2.32)<F1>
<RETURNS-OF-CAPITAL> 0
<PER-SHARE-NAV-END> 14.83<F1>
<EXPENSE-RATIO> 1.67<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-31-1998
<PERIOD-END> APR-30-1998
<INVESTMENTS-AT-COST> 708303
<INVESTMENTS-AT-VALUE> 913325
<RECEIVABLES> 7181
<ASSETS-OTHER> 17223
<OTHER-ITEMS-ASSETS> 0
<TOTAL-ASSETS> 937729
<PAYABLE-FOR-SECURITIES> 0
<SENIOR-LONG-TERM-DEBT> 0
<OTHER-ITEMS-LIABILITIES> 5487
<TOTAL-LIABILITIES> 5487
<SENIOR-EQUITY> 0
<PAID-IN-CAPITAL-COMMON> 709087
<SHARES-COMMON-STOCK> 4786<F1>
<SHARES-COMMON-PRIOR> 3600<F1>
<ACCUMULATED-NII-CURRENT> (5755)
<OVERDISTRIBUTION-NII> 0
<ACCUMULATED-NET-GAINS> 23865
<OVERDISTRIBUTION-GAINS> 0
<ACCUM-APPREC-OR-DEPREC> 205045
<NET-ASSETS> 68514<F1>
<DIVIDEND-INCOME> 78<F1>
<INTEREST-INCOME> 81<F1>
<OTHER-INCOME> 8<F1>
<EXPENSES-NET> (701)<F1>
<NET-INVESTMENT-INCOME> (534)<F1>
<REALIZED-GAINS-CURRENT> 27554
<APPREC-INCREASE-CURRENT> 105643
<NET-CHANGE-FROM-OPS> 127448
<EQUALIZATION> 0
<DISTRIBUTIONS-OF-INCOME> 0<F1>
<DISTRIBUTIONS-OF-GAINS> (8378)<F1>
<DISTRIBUTIONS-OTHER> 0
<NUMBER-OF-SHARES-SOLD> 1008<F1>
<NUMBER-OF-SHARES-REDEEMED> (438)<F1>
<SHARES-REINVESTED> 616<F1>
<NET-CHANGE-IN-ASSETS> 63057
<ACCUMULATED-NII-PRIOR> (6)
<ACCUMULATED-GAINS-PRIOR> 130196
<OVERDISTRIB-NII-PRIOR> 0
<OVERDIST-NET-GAINS-PRIOR> 0
<GROSS-ADVISORY-FEES> 288<F1>
<INTEREST-EXPENSE> 0
<GROSS-EXPENSE> 701<F1>
<AVERAGE-NET-ASSETS> 58164<F1>
<PER-SHARE-NAV-BEGIN> 14.73<F1>
<PER-SHARE-NII> (.12)<F1>
<PER-SHARE-GAIN-APPREC> 2.02<F1>
<PER-SHARE-DIVIDEND> 0<F1>
<PER-SHARE-DISTRIBUTIONS> (2.32)<F1>
<RETURNS-OF-CAPITAL> 0
<PER-SHARE-NAV-END> 14.31<F1>
<EXPENSE-RATIO> 2.43<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-31-1998
<PERIOD-END> APR-30-1998
<INVESTMENTS-AT-COST> 708303
<INVESTMENTS-AT-VALUE> 913325
<RECEIVABLES> 7181
<ASSETS-OTHER> 17223
<OTHER-ITEMS-ASSETS> 0
<TOTAL-ASSETS> 937729
<PAYABLE-FOR-SECURITIES> 0
<SENIOR-LONG-TERM-DEBT> 0
<OTHER-ITEMS-LIABILITIES> 5487
<TOTAL-LIABILITIES> 5487
<SENIOR-EQUITY> 0
<PAID-IN-CAPITAL-COMMON> 709087
<SHARES-COMMON-STOCK> 17319<F1>
<SHARES-COMMON-PRIOR> 15805<F1>
<ACCUMULATED-NII-CURRENT> (5755)
<OVERDISTRIBUTION-NII> 0
<ACCUMULATED-NET-GAINS> 23865
<OVERDISTRIBUTION-GAINS> 0
<ACCUM-APPREC-OR-DEPREC> 205045
<NET-ASSETS> 247562<F1>
<DIVIDEND-INCOME> 310<F1>
<INTEREST-INCOME> 322<F1>
<OTHER-INCOME> 32<F1>
<EXPENSES-NET> (2778)<F1>
<NET-INVESTMENT-INCOME> (2114)<F1>
<REALIZED-GAINS-CURRENT> 27554
<APPREC-INCREASE-CURRENT> 105643
<NET-CHANGE-FROM-OPS> 127448
<EQUALIZATION> 0
<DISTRIBUTIONS-OF-INCOME> 0<F1>
<DISTRIBUTIONS-OF-GAINS> (36605)<F1>
<DISTRIBUTIONS-OTHER> 0
<NUMBER-OF-SHARES-SOLD> 9167<F1>
<NUMBER-OF-SHARES-REDEEMED> (10393)<F1>
<SHARES-REINVESTED> 2740<F1>
<NET-CHANGE-IN-ASSETS> 63057
<ACCUMULATED-NII-PRIOR> (6)
<ACCUMULATED-GAINS-PRIOR> 130196
<OVERDISTRIB-NII-PRIOR> 0
<OVERDIST-NET-GAINS-PRIOR> 0
<GROSS-ADVISORY-FEES> 1143<F1>
<INTEREST-EXPENSE> 0
<GROSS-EXPENSE> 2778<F1>
<AVERAGE-NET-ASSETS> 230394<F1>
<PER-SHARE-NAV-BEGIN> 14.73<F1>
<PER-SHARE-NII> (.12)<F1>
<PER-SHARE-GAIN-APPREC> 2.00<F1>
<PER-SHARE-DIVIDEND> 0<F1>
<PER-SHARE-DISTRIBUTIONS> (2.32)<F1>
<RETURNS-OF-CAPITAL> 0
<PER-SHARE-NAV-END> 14.29<F1>
<EXPENSE-RATIO> 2.43<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-31-1998
<PERIOD-END> APR-30-1998
<INVESTMENTS-AT-COST> 148272
<INVESTMENTS-AT-VALUE> 209775
<RECEIVABLES> 999
<ASSETS-OTHER> 4565
<OTHER-ITEMS-ASSETS> 0
<TOTAL-ASSETS> 215339
<PAYABLE-FOR-SECURITIES> 359
<SENIOR-LONG-TERM-DEBT> 0
<OTHER-ITEMS-LIABILITIES> 1154
<TOTAL-LIABILITIES> 1513
<SENIOR-EQUITY> 0
<PAID-IN-CAPITAL-COMMON> 145009
<SHARES-COMMON-STOCK> 10942<F1>
<SHARES-COMMON-PRIOR> 11847<F1>
<ACCUMULATED-NII-CURRENT> (1142)
<OVERDISTRIBUTION-NII> 0
<ACCUMULATED-NET-GAINS> 7967
<OVERDISTRIBUTION-GAINS> 0
<ACCUM-APPREC-OR-DEPREC> 61992
<NET-ASSETS> 118303<F1>
<DIVIDEND-INCOME> 499<F1>
<INTEREST-INCOME> 55<F1>
<OTHER-INCOME> (103)<F1>
<EXPENSES-NET> (909)<F1>
<NET-INVESTMENT-INCOME> (458)<F1>
<REALIZED-GAINS-CURRENT> 8439
<APPREC-INCREASE-CURRENT> 32096
<NET-CHANGE-FROM-OPS> 39396
<EQUALIZATION> 0
<DISTRIBUTIONS-OF-INCOME> 0
<DISTRIBUTIONS-OF-GAINS> (4342)<F1>
<DISTRIBUTIONS-OTHER> 0
<NUMBER-OF-SHARES-SOLD> 1019<F1>
<NUMBER-OF-SHARES-REDEEMED> (2380)<F1>
<SHARES-REINVESTED> 456<F1>
<NET-CHANGE-IN-ASSETS> 21154
<ACCUMULATED-NII-PRIOR> (3)
<ACCUMULATED-GAINS-PRIOR> 7210
<OVERDISTRIB-NII-PRIOR> 0
<OVERDIST-NET-GAINS-PRIOR> 0
<GROSS-ADVISORY-FEES> 545<F1>
<INTEREST-EXPENSE> 0
<GROSS-EXPENSE> 909<F1>
<AVERAGE-NET-ASSETS> 109805<F1>
<PER-SHARE-NAV-BEGIN> 9.20<F1>
<PER-SHARE-NII> (.03)<F1>
<PER-SHARE-GAIN-APPREC> 2.01<F1>
<PER-SHARE-DIVIDEND> 0
<PER-SHARE-DISTRIBUTIONS> (.37)<F1>
<RETURNS-OF-CAPITAL> 0
<PER-SHARE-NAV-END> 10.81<F1>
<EXPENSE-RATIO> 1.67<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-31-1998
<PERIOD-END> APR-30-1998
<INVESTMENTS-AT-COST> 148272
<INVESTMENTS-AT-VALUE> 209775
<RECEIVABLES> 999
<ASSETS-OTHER> 4565
<OTHER-ITEMS-ASSETS> 0
<TOTAL-ASSETS> 215339
<PAYABLE-FOR-SECURITIES> 359
<SENIOR-LONG-TERM-DEBT> 0
<OTHER-ITEMS-LIABILITIES> 1154
<TOTAL-LIABILITIES> 1513
<SENIOR-EQUITY> 0
<PAID-IN-CAPITAL-COMMON> 145009
<SHARES-COMMON-STOCK> 2162<F1>
<SHARES-COMMON-PRIOR> 2130<F1>
<ACCUMULATED-NII-CURRENT> (1142)
<OVERDISTRIBUTION-NII> 0
<ACCUMULATED-NET-GAINS> 7967
<OVERDISTRIBUTION-GAINS> 0
<ACCUM-APPREC-OR-DEPREC> 61992
<NET-ASSETS> 22910<F1>
<DIVIDEND-INCOME> 91<F1>
<INTEREST-INCOME> 10<F1>
<OTHER-INCOME> (19)<F1>
<EXPENSES-NET> (242)<F1>
<NET-INVESTMENT-INCOME> (160)<F1>
<REALIZED-GAINS-CURRENT> 8439
<APPREC-INCREASE-CURRENT> 32096
<NET-CHANGE-FROM-OPS> 39396
<EQUALIZATION> 0
<DISTRIBUTIONS-OF-INCOME> 0
<DISTRIBUTIONS-OF-GAINS> (769)<F1>
<DISTRIBUTIONS-OTHER> 0
<NUMBER-OF-SHARES-SOLD> 361<F1>
<NUMBER-OF-SHARES-REDEEMED> (406)<F1>
<SHARES-REINVESTED> 77<F1>
<NET-CHANGE-IN-ASSETS> 21154
<ACCUMULATED-NII-PRIOR> (3)
<ACCUMULATED-GAINS-PRIOR> 7210
<OVERDISTRIB-NII-PRIOR> 0
<OVERDIST-NET-GAINS-PRIOR> 0
<GROSS-ADVISORY-FEES> 99<F1>
<INTEREST-EXPENSE> 0
<GROSS-EXPENSE> 241<F1>
<AVERAGE-NET-ASSETS> 20026<F1>
<PER-SHARE-NAV-BEGIN> 9.06<F1>
<PER-SHARE-NII> (.06)<F1>
<PER-SHARE-GAIN-APPREC> 1.96<F1>
<PER-SHARE-DIVIDEND> 0
<PER-SHARE-DISTRIBUTIONS> (.37)<F1>
<RETURNS-OF-CAPITAL> 0
<PER-SHARE-NAV-END> 10.59<F1>
<EXPENSE-RATIO> 2.43<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-31-1998
<PERIOD-END> APR-30-1998
<INVESTMENTS-AT-COST> 148272
<INVESTMENTS-AT-VALUE> 209775
<RECEIVABLES> 999
<ASSETS-OTHER> 4565
<OTHER-ITEMS-ASSETS> 0
<TOTAL-ASSETS> 215339
<PAYABLE-FOR-SECURITIES> 359
<SENIOR-LONG-TERM-DEBT> 0
<OTHER-ITEMS-LIABILITIES> 1154
<TOTAL-LIABILITIES> 1513
<SENIOR-EQUITY> 0
<PAID-IN-CAPITAL-COMMON> 145009
<SHARES-COMMON-STOCK> 6853<F1>
<SHARES-COMMON-PRIOR> 7093<F1>
<ACCUMULATED-NII-CURRENT> (1142)
<OVERDISTRIBUTION-NII> 0
<ACCUMULATED-NET-GAINS> 7967
<OVERDISTRIBUTION-GAINS> 0
<ACCUM-APPREC-OR-DEPREC> 61992
<NET-ASSETS> 72613<F1>
<DIVIDEND-INCOME> 299<F1>
<INTEREST-INCOME> 33<F1>
<OTHER-INCOME> (60)<F1>
<EXPENSES-NET> (793)<F1>
<NET-INVESTMENT-INCOME> (521)<F1>
<REALIZED-GAINS-CURRENT> 8439
<APPREC-INCREASE-CURRENT> 32096
<NET-CHANGE-FROM-OPS> 39396
<EQUALIZATION> 0
<DISTRIBUTIONS-OF-INCOME> 0
<DISTRIBUTIONS-OF-GAINS> (2571)<F1>
<DISTRIBUTIONS-OTHER> 0
<NUMBER-OF-SHARES-SOLD> 683<F1>
<NUMBER-OF-SHARES-REDEEMED> (1196)<F1>
<SHARES-REINVESTED> 273<F1>
<NET-CHANGE-IN-ASSETS> 21154
<ACCUMULATED-NII-PRIOR> (3)
<ACCUMULATED-GAINS-PRIOR> 7210
<OVERDISTRIB-NII-PRIOR> 0
<OVERDIST-NET-GAINS-PRIOR> 0
<GROSS-ADVISORY-FEES> 326<F1>
<INTEREST-EXPENSE> 0
<GROSS-EXPENSE> 793<F1>
<AVERAGE-NET-ASSETS> 65783<F1>
<PER-SHARE-NAV-BEGIN> 9.06<F1>
<PER-SHARE-NII> (.06)<F1>
<PER-SHARE-GAIN-APPREC> 1.96<F1>
<PER-SHARE-DIVIDEND> 0
<PER-SHARE-DISTRIBUTIONS> (.37)<F1>
<RETURNS-OF-CAPITAL> 0
<PER-SHARE-NAV-END> 10.59<F1>
<EXPENSE-RATIO> 2.43<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-31-1998
<PERIOD-END> APR-30-1998
<INVESTMENTS-AT-COST> 82287
<INVESTMENTS-AT-VALUE> 92823
<RECEIVABLES> 471
<ASSETS-OTHER> 5038
<OTHER-ITEMS-ASSETS> 0
<TOTAL-ASSETS> 98332
<PAYABLE-FOR-SECURITIES> 298
<SENIOR-LONG-TERM-DEBT> 0
<OTHER-ITEMS-LIABILITIES> 855
<TOTAL-LIABILITIES> 1153
<SENIOR-EQUITY> 0
<PAID-IN-CAPITAL-COMMON> 93875
<SHARES-COMMON-STOCK> 5231<F1>
<SHARES-COMMON-PRIOR> 6002<F1>
<ACCUMULATED-NII-CURRENT> (1020)
<OVERDISTRIBUTION-NII> 0
<ACCUMULATED-NET-GAINS> (6213)
<OVERDISTRIBUTION-GAINS> 0
<ACCUM-APPREC-OR-DEPREC> 10537
<NET-ASSETS> 41562<F1>
<DIVIDEND-INCOME> 142<F1>
<INTEREST-INCOME> 110<F1>
<OTHER-INCOME> (150)<F1>
<EXPENSES-NET> (444)<F1>
<NET-INVESTMENT-INCOME> (342)<F1>
<REALIZED-GAINS-CURRENT> (2591)
<APPREC-INCREASE-CURRENT> 10760
<NET-CHANGE-FROM-OPS> 7150
<EQUALIZATION> 0
<DISTRIBUTIONS-OF-INCOME> 0
<DISTRIBUTIONS-OF-GAINS> 0<F1>
<DISTRIBUTIONS-OTHER> 0
<NUMBER-OF-SHARES-SOLD> 1962<F1>
<NUMBER-OF-SHARES-REDEEMED> (2733)<F1>
<SHARES-REINVESTED> 0<F1>
<NET-CHANGE-IN-ASSETS> (6962)
<ACCUMULATED-NII-PRIOR> (1)
<ACCUMULATED-GAINS-PRIOR> (3622)
<OVERDISTRIB-NII-PRIOR> 0
<OVERDIST-NET-GAINS-PRIOR> 0
<GROSS-ADVISORY-FEES> 256<F1>
<INTEREST-EXPENSE> 0
<GROSS-EXPENSE> 444<F1>
<AVERAGE-NET-ASSETS> 41292<F1>
<PER-SHARE-NAV-BEGIN> 7.34<F1>
<PER-SHARE-NII> (.03)<F1>
<PER-SHARE-GAIN-APPREC> .64<F1>
<PER-SHARE-DIVIDEND> 0
<PER-SHARE-DISTRIBUTIONS> 0
<RETURNS-OF-CAPITAL> 0
<PER-SHARE-NAV-END> 7.95<F1>
<EXPENSE-RATIO> 2.17<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-31-1998
<PERIOD-END> APR-30-1998
<INVESTMENTS-AT-COST> 82287
<INVESTMENTS-AT-VALUE> 92823
<RECEIVABLES> 471
<ASSETS-OTHER> 5038
<OTHER-ITEMS-ASSETS> 0
<TOTAL-ASSETS> 98332
<PAYABLE-FOR-SECURITIES> 298
<SENIOR-LONG-TERM-DEBT> 0
<OTHER-ITEMS-LIABILITIES> 855
<TOTAL-LIABILITIES> 1153
<SENIOR-EQUITY> 0
<PAID-IN-CAPITAL-COMMON> 93875
<SHARES-COMMON-STOCK> 3683<F1>
<SHARES-COMMON-PRIOR> 3966<F1>
<ACCUMULATED-NII-CURRENT> (1020)
<OVERDISTRIBUTION-NII> 0
<ACCUMULATED-NET-GAINS> (6213)
<OVERDISTRIBUTION-GAINS> 0
<ACCUM-APPREC-OR-DEPREC> 10537
<NET-ASSETS> 28860<F1>
<DIVIDEND-INCOME> 97<F1>
<INTEREST-INCOME> 73<F1>
<OTHER-INCOME> (102)<F1>
<EXPENSES-NET> (407)<F1>
<NET-INVESTMENT-INCOME> (339)<F1>
<REALIZED-GAINS-CURRENT> (2591)
<APPREC-INCREASE-CURRENT> 10760
<NET-CHANGE-FROM-OPS> 7150
<EQUALIZATION> 0
<DISTRIBUTIONS-OF-INCOME> 0
<DISTRIBUTIONS-OF-GAINS> 0<F1>
<DISTRIBUTIONS-OTHER> 0
<NUMBER-OF-SHARES-SOLD> 419<F1>
<NUMBER-OF-SHARES-REDEEMED> (702)<F1>
<SHARES-REINVESTED> 0<F1>
<NET-CHANGE-IN-ASSETS> (6962)
<ACCUMULATED-NII-PRIOR> (1)
<ACCUMULATED-GAINS-PRIOR> (3622)
<OVERDISTRIB-NII-PRIOR> 0
<OVERDIST-NET-GAINS-PRIOR> 0
<GROSS-ADVISORY-FEES> 173<F1>
<INTEREST-EXPENSE> 0
<GROSS-EXPENSE> 407<F1>
<AVERAGE-NET-ASSETS> 27936<F1>
<PER-SHARE-NAV-BEGIN> 7.27<F1>
<PER-SHARE-NII> (.06)<F1>
<PER-SHARE-GAIN-APPREC> .63<F1>
<PER-SHARE-DIVIDEND> 0
<PER-SHARE-DISTRIBUTIONS> 0
<RETURNS-OF-CAPITAL> 0
<PER-SHARE-NAV-END> 7.84<F1>
<EXPENSE-RATIO> 2.94<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-31-1998
<PERIOD-END> APR-30-1998
<INVESTMENTS-AT-COST> 82287
<INVESTMENTS-AT-VALUE> 92823
<RECEIVABLES> 471
<ASSETS-OTHER> 5038
<OTHER-ITEMS-ASSETS> 0
<TOTAL-ASSETS> 98332
<PAYABLE-FOR-SECURITIES> 298
<SENIOR-LONG-TERM-DEBT> 0
<OTHER-ITEMS-LIABILITIES> 855
<TOTAL-LIABILITIES> 1153
<SENIOR-EQUITY> 0
<PAID-IN-CAPITAL-COMMON> 93875
<SHARES-COMMON-STOCK> 3415<F1>
<SHARES-COMMON-PRIOR> 4302<F1>
<ACCUMULATED-NII-CURRENT> (1020)
<OVERDISTRIBUTION-NII> 0
<ACCUMULATED-NET-GAINS> (6213)
<OVERDISTRIBUTION-GAINS> 0
<ACCUM-APPREC-OR-DEPREC> 10537
<NET-ASSETS> 26756<F1>
<DIVIDEND-INCOME> 95<F1>
<INTEREST-INCOME> 76<F1>
<OTHER-INCOME> (101)<F1>
<EXPENSES-NET> (408)<F1>
<NET-INVESTMENT-INCOME> (338)<F1>
<REALIZED-GAINS-CURRENT> (2591)
<APPREC-INCREASE-CURRENT> 10760
<NET-CHANGE-FROM-OPS> 7150
<EQUALIZATION> 0
<DISTRIBUTIONS-OF-INCOME> 0
<DISTRIBUTIONS-OF-GAINS> 0<F1>
<DISTRIBUTIONS-OTHER> 0
<NUMBER-OF-SHARES-SOLD> 534<F1>
<NUMBER-OF-SHARES-REDEEMED> (1421)<F1>
<SHARES-REINVESTED> 0<F1>
<NET-CHANGE-IN-ASSETS> (6962)
<ACCUMULATED-NII-PRIOR> (1)
<ACCUMULATED-GAINS-PRIOR> (3622)
<OVERDISTRIB-NII-PRIOR> 0
<OVERDIST-NET-GAINS-PRIOR> 0
<GROSS-ADVISORY-FEES> 174<F1>
<INTEREST-EXPENSE> 0
<GROSS-EXPENSE> 407<F1>
<AVERAGE-NET-ASSETS> 28017<F1>
<PER-SHARE-NAV-BEGIN> 7.27<F1>
<PER-SHARE-NII> (.06)<F1>
<PER-SHARE-GAIN-APPREC> .62<F1>
<PER-SHARE-DIVIDEND> 0
<PER-SHARE-DISTRIBUTIONS> 0
<RETURNS-OF-CAPITAL> 0
<PER-SHARE-NAV-END> 7.83<F1>
<EXPENSE-RATIO> 2.94<F1>
<AVG-DEBT-OUTSTANDING> 0
<AVG-DEBT-PER-SHARE> 0
<FN>
<F1>Class D only. All other data are fund level.
</FN>
</TABLE>
