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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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072 Y000400 0
072 Z000400 -1009
072AA000400 26650
072BB000400 5065
072CC010400 17621
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 8634
074 B000400 0
074 C000400 0
074 D000400 152
074 E000400 0
<PAGE> PAGE 21
074 F000400 200797
074 G000400 0
074 H000400 0
074 I000400 0
074 J000400 2544
074 K000400 75
074 L000400 610
074 M000400 214
074 N000400 213026
074 O000400 330
074 P000400 180
074 Q000400 0
074 R010400 0
074 R020400 0
074 R030400 0
074 R040400 979
074 S000400 0
074 T000400 211537
074 U010400 9374
074 U020400 6388
074 V010400 11.68
074 V020400 11.37
074 W000400 0.0000
074 X000400 12868
074 Y000400 0
075 A000400 0
075 B000400 201380
076 000400 0.00
028 A010500 4934
028 A020500 0
028 A030500 0
028 A040500 6939
028 B010500 5034
028 B020500 0
028 B030500 0
028 B040500 7605
028 C010500 10043
028 C020500 0
028 C030500 0
028 C040500 11982
028 D010500 4871
028 D020500 0
028 D030500 0
028 D040500 6573
028 E010500 12774
028 E020500 0
028 E030500 0
028 E040500 14863
028 F010500 16592
028 F020500 0
028 F030500 0
<PAGE> PAGE 22
028 F040500 15002
028 G010500 54248
028 G020500 0
028 G030500 0
028 G040500 62964
028 H000500 510
029 000500 Y
030 A000500 19
030 B000500 4.75
030 C000500 0.00
031 A000500 2
031 B000500 0
032 000500 17
033 000500 0
034 000500 Y
035 000500 94
036 A000500 N
036 B000500 0
042 A000500 0
042 B000500 0
042 C000500 0
042 D000500 100
042 E000500 0
042 F000500 0
042 G000500 0
042 H000500 0
043 000500 171
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
048 G020500 0.000
048 H010500 0
048 H020500 0.000
048 I010500 0
048 I020500 0.000
048 J010500 0
<PAGE> PAGE 23
048 J020500 0.000
048 K010500 0
048 K020500 0.000
055 A000500 N
055 B000500 N
056 000500 Y
057 000500 N
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
070 M020500 Y
070 N010500 Y
070 N020500 N
070 O010500 Y
070 O020500 N
070 P010500 Y
070 P020500 N
070 Q010500 N
<PAGE> PAGE 24
070 Q020500 N
070 R010500 Y
070 R020500 N
071 A000500 29436
071 B000500 39588
071 C000500 50068
071 D000500 59
072 A000500 6
072 B000500 36
072 C000500 364
072 D000500 0
072 E000500 -195
072 F000500 321
072 G000500 0
072 H000500 0
072 I000500 128
072 J000500 45
072 K000500 15
072 L000500 37
072 M000500 6
072 N000500 16
072 O000500 0
072 P000500 0
072 Q000500 0
072 R000500 18
072 S000500 7
072 T000500 171
072 U000500 0
072 V000500 0
072 W000500 4
072 X000500 768
072 Y000500 0
072 Z000500 -563
072AA000500 9060
072BB000500 8741
072CC010500 12918
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 6550
074 B000500 0
074 C000500 0
074 D000500 0
074 E000500 213
074 F000500 53825
074 G000500 0
<PAGE> PAGE 25
074 H000500 0
074 I000500 0
074 J000500 2566
074 K000500 41
074 L000500 315
074 M000500 18
074 N000500 63528
074 O000500 2740
074 P000500 57
074 Q000500 0
074 R010500 0
074 R020500 0
074 R030500 0
074 R040500 2781
074 S000500 0
074 T000500 57950
074 U010500 4274
074 U020500 2104
074 V010500 6.59
074 V020500 6.45
074 W000500 0.0000
074 X000500 9046
074 Y000500 0
075 A000500 0
075 B000500 52131
076 000500 0.00
SIGNATURE THOMAS G. ROSE
TITLE TREASURER
WARNING: THE EDGAR SYSTEM ENCOUNTERED ERROR(S) WHILE PROCESSING THIS SCHEDULE.
<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-31-1999
<PERIOD-END> APR-30-1999
<INVESTMENTS-AT-COST> 73771
<INVESTMENTS-AT-VALUE> 92718
<RECEIVABLES> 365
<ASSETS-OTHER> 152
<OTHER-ITEMS-ASSETS> 0
<TOTAL-ASSETS> 93235
<PAYABLE-FOR-SECURITIES> 819
<SENIOR-LONG-TERM-DEBT> 0
<OTHER-ITEMS-LIABILITIES> 2364
<TOTAL-LIABILITIES> 3183
<SENIOR-EQUITY> 0
<PAID-IN-CAPITAL-COMMON> 63815
<SHARES-COMMON-STOCK> 2124<F1>
<SHARES-COMMON-PRIOR> 2485<F1>
<ACCUMULATED-NII-CURRENT> (368)
<OVERDISTRIBUTION-NII> 0
<ACCUMULATED-NET-GAINS> 7531
<OVERDISTRIBUTION-GAINS> 0
<ACCUM-APPREC-OR-DEPREC> 19074
<NET-ASSETS> 42552<F1>
<DIVIDEND-INCOME> 312<F1>
<INTEREST-INCOME> 36<F1>
<OTHER-INCOME> (23)<F1>
<EXPENSES-NET> (408)<F1>
<NET-INVESTMENT-INCOME> (83)<F1>
<REALIZED-GAINS-CURRENT> 6577
<APPREC-INCREASE-CURRENT> 5403
<NET-CHANGE-FROM-OPS> 11624
<EQUALIZATION> 0
<DISTRIBUTIONS-OF-INCOME> 0
<DISTRIBUTIONS-OF-GAINS> 0<F1>
<DISTRIBUTIONS-OTHER> 0
<NUMBER-OF-SHARES-SOLD> 3478<F1>
<NUMBER-OF-SHARES-REDEEMED> (3839)<F1>
<SHARES-REINVESTED> 0<F1>
<NET-CHANGE-IN-ASSETS> (1389)
<ACCUMULATED-NII-PRIOR> (12)
<ACCUMULATED-GAINS-PRIOR> 955
<OVERDISTRIB-NII-PRIOR> 0
<OVERDIST-NET-GAINS-PRIOR> 0
<GROSS-ADVISORY-FEES> 222<F1>
<INTEREST-EXPENSE> 0
<GROSS-EXPENSE> (408)<F1>
<AVERAGE-NET-ASSETS> 44891<F1>
<PER-SHARE-NAV-BEGIN> 17.75<F1>
<PER-SHARE-NII> (.03)<F1>
<PER-SHARE-GAIN-APPREC> 2.32<F1>
<PER-SHARE-DIVIDEND> 0
<PER-SHARE-DISTRIBUTIONS> 0<F1>
<RETURNS-OF-CAPITAL> 0
<PER-SHARE-NAV-END> 20.04<F1>
<EXPENSE-RATIO> 1.84<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>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-30-1999
<INVESTMENTS-AT-COST> 73771
<INVESTMENTS-AT-VALUE> 92718
<RECEIVABLES> 365
<ASSETS-OTHER> 152
<OTHER-ITEMS-ASSETS> 0
<TOTAL-ASSETS> 93235
<PAYABLE-FOR-SECURITIES> 819
<SENIOR-LONG-TERM-DEBT> 0
<OTHER-ITEMS-LIABILITIES> 2364
<TOTAL-LIABILITIES> 3183
<SENIOR-EQUITY> 0
<PAID-IN-CAPITAL-COMMON> 63815
<SHARES-COMMON-STOCK> 554<F1>
<SHARES-COMMON-PRIOR> 581<F1>
<ACCUMULATED-NII-CURRENT> (368)
<OVERDISTRIBUTION-NII> 0
<ACCUMULATED-NET-GAINS> 7531
<OVERDISTRIBUTION-GAINS> 0
<ACCUM-APPREC-OR-DEPREC> 19074
<NET-ASSETS> 10557<F1>
<DIVIDEND-INCOME> 74<F1>
<INTEREST-INCOME> 8<F1>
<OTHER-INCOME> (5)<F1>
<EXPENSES-NET> (134)<F1>
<NET-INVESTMENT-INCOME> (57)<F1>
<REALIZED-GAINS-CURRENT> 6577
<APPREC-INCREASE-CURRENT> 5403
<NET-CHANGE-FROM-OPS> 11624
<EQUALIZATION> 0
<DISTRIBUTIONS-OF-INCOME> 0
<DISTRIBUTIONS-OF-GAINS> 0<F1>
<DISTRIBUTIONS-OTHER> 0
<NUMBER-OF-SHARES-SOLD> 72<F1>
<NUMBER-OF-SHARES-REDEEMED> (99)<F1>
<SHARES-REINVESTED> 0<F1>
<NET-CHANGE-IN-ASSETS> (1389)
<ACCUMULATED-NII-PRIOR> (12)
<ACCUMULATED-GAINS-PRIOR> 955
<OVERDISTRIB-NII-PRIOR> 0
<OVERDIST-NET-GAINS-PRIOR> 0
<GROSS-ADVISORY-FEES> 52<F1>
<INTEREST-EXPENSE> 0
<GROSS-EXPENSE> (134)<F1>
<AVERAGE-NET-ASSETS> 10411<F1>
<PER-SHARE-NAV-BEGIN> 16.93<F1>
<PER-SHARE-NII> (.09)<F1>
<PER-SHARE-GAIN-APPREC> 2.20<F1>
<PER-SHARE-DIVIDEND> 0
<PER-SHARE-DISTRIBUTIONS> 0<F1>
<RETURNS-OF-CAPITAL> 0
<PER-SHARE-NAV-END> 19.04<F1>
<EXPENSE-RATIO> 2.59<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>014
<NAME> SELIGMAN HENDERSON INTERNATIONAL FUND CLASS D
<MULTIPLIER> 1000
<S> <C>
<PERIOD-TYPE> 6-MOS
<FISCAL-YEAR-END> OCT-31-1999
<PERIOD-END> APR-30-1999
<INVESTMENTS-AT-COST> 73771
<INVESTMENTS-AT-VALUE> 92718
<RECEIVABLES> 365
<ASSETS-OTHER> 12
<OTHER-ITEMS-ASSETS> 0
<TOTAL-ASSETS> 93235
<PAYABLE-FOR-SECURITIES> 819
<SENIOR-LONG-TERM-DEBT> 0
<OTHER-ITEMS-LIABILITIES> 2364
<TOTAL-LIABILITIES> 3183
<SENIOR-EQUITY> 0
<PAID-IN-CAPITAL-COMMON> 63815
<SHARES-COMMON-STOCK> 1942<F1>
<SHARES-COMMON-PRIOR> 2215<F1>
<ACCUMULATED-NII-CURRENT> (368)
<OVERDISTRIBUTION-NII> 0
<ACCUMULATED-NET-GAINS> 7531
<OVERDISTRIBUTION-GAINS> 0
<ACCUM-APPREC-OR-DEPREC> 19074
<NET-ASSETS> 36943<F1>
<DIVIDEND-INCOME> 271<F1>
<INTEREST-INCOME> 30<F1>
<OTHER-INCOME> (19)<F1>
<EXPENSES-NET> (498)<F1>
<NET-INVESTMENT-INCOME> (216)<F1>
<REALIZED-GAINS-CURRENT> 6577
<APPREC-INCREASE-CURRENT> 5403
<NET-CHANGE-FROM-OPS> 11624
<EQUALIZATION> 0
<DISTRIBUTIONS-OF-INCOME> 0
<DISTRIBUTIONS-OF-GAINS> 0<F1>
<DISTRIBUTIONS-OTHER> 0
<NUMBER-OF-SHARES-SOLD> 973<F1>
<NUMBER-OF-SHARES-REDEEMED> (1246)<F1>
<SHARES-REINVESTED> 0<F1>
<NET-CHANGE-IN-ASSETS> (1389)
<ACCUMULATED-NII-PRIOR> (12)
<ACCUMULATED-GAINS-PRIOR> 955
<OVERDISTRIB-NII-PRIOR> 0
<OVERDIST-NET-GAINS-PRIOR> 0
<GROSS-ADVISORY-FEES> 193<F1>
<INTEREST-EXPENSE> 0
<GROSS-EXPENSE> (498)<F1>
<AVERAGE-NET-ASSETS> 38856<F1>
<PER-SHARE-NAV-BEGIN> 16.93<F1>
<PER-SHARE-NII> (.09)<F1>
<PER-SHARE-GAIN-APPREC> 2.19<F1>
<PER-SHARE-DIVIDEND> 0
<PER-SHARE-DISTRIBUTIONS> 0<F1>
<RETURNS-OF-CAPITAL> 0
<PER-SHARE-NAV-END> 19.03<F1>
<EXPENSE-RATIO> 2.59<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>021
<NAME> SELIGMAN HENDERSON GLOBAL SMALLER COS FUND CLASS A
<MULTIPLIER> 1000
<S> <C>
<PERIOD-TYPE> 6-MOS
<FISCAL-YEAR-END> OCT-31-1999
<PERIOD-END> APR-30-1999
<INVESTMENTS-AT-COST> 508710
<INVESTMENTS-AT-VALUE> 549627
<RECEIVABLES> 31572
<ASSETS-OTHER> 32303
<OTHER-ITEMS-ASSETS> 0
<TOTAL-ASSETS> 613502
<PAYABLE-FOR-SECURITIES> 2222
<SENIOR-LONG-TERM-DEBT> 0
<OTHER-ITEMS-LIABILITIES> 6267
<TOTAL-LIABILITIES> 8489
<SENIOR-EQUITY> 0
<PAID-IN-CAPITAL-COMMON> 572839
<SHARES-COMMON-STOCK> 15960<F1>
<SHARES-COMMON-PRIOR> 26572<F1>
<ACCUMULATED-NII-CURRENT> (5434)
<OVERDISTRIBUTION-NII> 0
<ACCUMULATED-NET-GAINS> (4246)
<OVERDISTRIBUTION-GAINS> 0
<ACCUM-APPREC-OR-DEPREC> 41854
<NET-ASSETS> 232117<F1>
<DIVIDEND-INCOME> 1177<F1>
<INTEREST-INCOME> 114<F1>
<OTHER-INCOME> (124)<F1>
<EXPENSES-NET> (2711)<F1>
<NET-INVESTMENT-INCOME> (1544)<F1>
<REALIZED-GAINS-CURRENT> 13814
<APPREC-INCREASE-CURRENT> 13616
<NET-CHANGE-FROM-OPS> 22006
<EQUALIZATION> 0
<DISTRIBUTIONS-OF-INCOME> 0
<DISTRIBUTIONS-OF-GAINS> 0<F1>
<DISTRIBUTIONS-OTHER> 0
<NUMBER-OF-SHARES-SOLD> 10748<F1>
<NUMBER-OF-SHARES-REDEEMED> (21361)<F1>
<SHARES-REINVESTED> 0<F1>
<NET-CHANGE-IN-ASSETS> (265365)
<ACCUMULATED-NII-PRIOR> (11)
<ACCUMULATED-GAINS-PRIOR> (18060)
<OVERDISTRIB-NII-PRIOR> 0
<OVERDIST-NET-GAINS-PRIOR> 0
<GROSS-ADVISORY-FEES> 1589<F1>
<INTEREST-EXPENSE> 0
<GROSS-EXPENSE> 2711<F1>
<AVERAGE-NET-ASSETS> 320648<F1>
<PER-SHARE-NAV-BEGIN> 14.11<F1>
<PER-SHARE-NII> (.06)<F1>
<PER-SHARE-GAIN-APPREC> .49<F1>
<PER-SHARE-DIVIDEND> 0
<PER-SHARE-DISTRIBUTIONS> 0<F1>
<RETURNS-OF-CAPITAL> 0
<PER-SHARE-NAV-END> 14.54<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>
WARNING: THE EDGAR SYSTEM ENCOUNTERED ERROR(S) WHILE PROCESSING THIS SCHEDULE.
<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-31-1999
<PERIOD-END> APR-30-1999
<INVESTMENTS-AT-COST> 508710
<INVESTMENTS-AT-VALUE> 549627
<RECEIVABLES> 31572
<ASSETS-OTHER> 32303
<OTHER-ITEMS-ASSETS> 0
<TOTAL-ASSETS> 613502
<PAYABLE-FOR-SECURITIES> 2222
<SENIOR-LONG-TERM-DEBT> 0
<OTHER-ITEMS-LIABILITIES> 6267
<TOTAL-LIABILITIES> 8489
<SENIOR-EQUITY> 0
<PAID-IN-CAPITAL-COMMON> 572839
<SHARES-COMMON-STOCK> 12694<F1>
<SHARES-COMMON-PRIOR> 16531<F1>
<ACCUMULATED-NII-CURRENT> (5434)
<OVERDISTRIBUTION-NII> 0
<ACCUMULATED-NET-GAINS> (4246)
<OVERDISTRIBUTION-GAINS> 0
<ACCUM-APPREC-OR-DEPREC> 41854
<NET-ASSETS> 175437<F1>
<DIVIDEND-INCOME> 760<F1>
<INTEREST-INCOME> 74<F1>
<OTHER-INCOME> (80)<F1>
<EXPENSES-NET> (2526)<F1>
<NET-INVESTMENT-INCOME> (1772)<F1>
<REALIZED-GAINS-CURRENT> 13814
<APPREC-INCREASE-CURRENT> 13616
<NET-CHANGE-FROM-OPS> 22006
<EQUALIZATION> 0
<DISTRIBUTIONS-OF-INCOME> 0
<DISTRIBUTIONS-OF-GAINS> 0<F1>
<DISTRIBUTIONS-OTHER> 0
<NUMBER-OF-SHARES-SOLD> 520<F1>
<NUMBER-OF-SHARES-REDEEMED> (4356)<F1>
<SHARES-REINVESTED> 0<F1>
<NET-CHANGE-IN-ASSETS> (265365)
<ACCUMULATED-NII-PRIOR> (11)
<ACCUMULATED-GAINS-PRIOR> (18060)
<OVERDISTRIB-NII-PRIOR> 0
<OVERDIST-NET-GAINS-PRIOR> 0
<GROSS-ADVISORY-FEES> 1029<F1>
<INTEREST-EXPENSE> 0
<GROSS-EXPENSE> 2526<F1>
<AVERAGE-NET-ASSETS> 207365<F1>
<PER-SHARE-NAV-BEGIN> 13.46<F1>
<PER-SHARE-NII> (.11)<F1>
<PER-SHARE-GAIN-APPREC> 0.47<F1>
<PER-SHARE-DIVIDEND> 0
<PER-SHARE-DISTRIBUTIONS> 0<F1>
<RETURNS-OF-CAPITAL> 0
<PER-SHARE-NAV-END> 13.82<F1>
<EXPENSE-RATIO> 2.46<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>024
<NAME> SELIGMAN HENDERSON GLOBAL SMALLER COS FUND CLASS D
<MULTIPLIER> 1000
<S> <C>
<PERIOD-TYPE> 6-MOS
<FISCAL-YEAR-END> OCT-31-1999
<PERIOD-END> APR-30-1999
<INVESTMENTS-AT-COST> 508710
<INVESTMENTS-AT-VALUE> 549627
<RECEIVABLES> 31572
<ASSETS-OTHER> 32303
<OTHER-ITEMS-ASSETS> 0
<TOTAL-ASSETS> 613502
<PAYABLE-FOR-SECURITIES> 2222
<SENIOR-LONG-TERM-DEBT> 0
<OTHER-ITEMS-LIABILITIES> 6267
<TOTAL-LIABILITIES> 8489
<SENIOR-EQUITY> 0
<PAID-IN-CAPITAL-COMMON> 572839
<SHARES-COMMON-STOCK> 14278<F1>
<SHARES-COMMON-PRIOR> 20273<F1>
<ACCUMULATED-NII-CURRENT> (5434)
<OVERDISTRIBUTION-NII> 0
<ACCUMULATED-NET-GAINS> (4246)
<OVERDISTRIBUTION-GAINS> 0
<ACCUM-APPREC-OR-DEPREC> 41854
<NET-ASSETS> 197459<F1>
<DIVIDEND-INCOME> 904<F1>
<INTEREST-INCOME> 88<F1>
<OTHER-INCOME> (95)<F1>
<EXPENSES-NET> (3004)<F1>
<NET-INVESTMENT-INCOME> (2107)<F1>
<REALIZED-GAINS-CURRENT> 13814
<APPREC-INCREASE-CURRENT> 13616
<NET-CHANGE-FROM-OPS> 22006
<EQUALIZATION> 0
<DISTRIBUTIONS-OF-INCOME> 0
<DISTRIBUTIONS-OF-GAINS> 0<F1>
<DISTRIBUTIONS-OTHER> 0
<NUMBER-OF-SHARES-SOLD> 742<F1>
<NUMBER-OF-SHARES-REDEEMED> (6738)<F1>
<SHARES-REINVESTED> 0<F1>
<NET-CHANGE-IN-ASSETS> (265365)
<ACCUMULATED-NII-PRIOR> (11)
<ACCUMULATED-GAINS-PRIOR> (18060)
<OVERDISTRIB-NII-PRIOR> 0
<OVERDIST-NET-GAINS-PRIOR> 0
<GROSS-ADVISORY-FEES> 1223<F1>
<INTEREST-EXPENSE> 0
<GROSS-EXPENSE> 3004<F1>
<AVERAGE-NET-ASSETS> 246606<F1>
<PER-SHARE-NAV-BEGIN> 13.47<F1>
<PER-SHARE-NII> (.11)<F1>
<PER-SHARE-GAIN-APPREC> 0.47<F1>
<PER-SHARE-DIVIDEND> 0
<PER-SHARE-DISTRIBUTIONS> 0<F1>
<RETURNS-OF-CAPITAL> 0
<PER-SHARE-NAV-END> 13.83<F1>
<EXPENSE-RATIO> 2.46<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>031
<NAME> SELIGMAN HENDERSON GLOBAL TECHNOLOGY FUND CLASS A
<MULTIPLIER> 1000
<S> <C>
<PERIOD-TYPE> 6-MOS
<FISCAL-YEAR-END> OCT-31-1999
<PERIOD-END> APR-30-1999
<INVESTMENTS-AT-COST> 706024
<INVESTMENTS-AT-VALUE> 841607
<RECEIVABLES> 33787
<ASSETS-OTHER> 4684
<OTHER-ITEMS-ASSETS> 0
<TOTAL-ASSETS> 880078
<PAYABLE-FOR-SECURITIES> 9192
<SENIOR-LONG-TERM-DEBT> 0
<OTHER-ITEMS-LIABILITIES> 4625
<TOTAL-LIABILITIES> 13817
<SENIOR-EQUITY> 0
<PAID-IN-CAPITAL-COMMON> 575794
<SHARES-COMMON-STOCK> 34202<F1>
<SHARES-COMMON-PRIOR> 38147<F1>
<ACCUMULATED-NII-CURRENT> (5888)
<OVERDISTRIBUTION-NII> 0
<ACCUMULATED-NET-GAINS> 160856
<OVERDISTRIBUTION-GAINS> 0
<ACCUM-APPREC-OR-DEPREC> 135499
<NET-ASSETS> 568498<F1>
<DIVIDEND-INCOME> 1051<F1>
<INTEREST-INCOME> 414<F1>
<OTHER-INCOME> (122)<F1>
<EXPENSES-NET> (4521)<F1>
<NET-INVESTMENT-INCOME> (3178)<F1>
<REALIZED-GAINS-CURRENT> 171030
<APPREC-INCREASE-CURRENT> 75965
<NET-CHANGE-FROM-OPS> 241114
<EQUALIZATION> 0
<DISTRIBUTIONS-OF-INCOME> 0<F1>
<DISTRIBUTIONS-OF-GAINS> 0<F1>
<DISTRIBUTIONS-OTHER> 0
<NUMBER-OF-SHARES-SOLD> 15851<F1>
<NUMBER-OF-SHARES-REDEEMED> (20211)<F1>
<SHARES-REINVESTED> 415<F1>
<NET-CHANGE-IN-ASSETS> 147702
<ACCUMULATED-NII-PRIOR> (8)
<ACCUMULATED-GAINS-PRIOR> 0
<OVERDISTRIB-NII-PRIOR> 0
<OVERDIST-NET-GAINS-PRIOR> 0
<GROSS-ADVISORY-FEES> 2738<F1>
<INTEREST-EXPENSE> 0
<GROSS-EXPENSE> 4521<F1>
<AVERAGE-NET-ASSETS> 552445<F1>
<PER-SHARE-NAV-BEGIN> 12.48<F1>
<PER-SHARE-NII> (.09)<F1>
<PER-SHARE-GAIN-APPREC> 4.39<F1>
<PER-SHARE-DIVIDEND> 0<F1>
<PER-SHARE-DISTRIBUTIONS> (.16)<F1>
<RETURNS-OF-CAPITAL> 0
<PER-SHARE-NAV-END> 16.62<F1>
<EXPENSE-RATIO> 1.65<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>032
<NAME> SELIGMAN HENDERSON GLOBAL TECHNOLOGY FUND CLASS B
<MULTIPLIER> 1000
<S> <C>
<PERIOD-TYPE> 6-MOS
<FISCAL-YEAR-END> OCT-31-1999
<PERIOD-END> APR-30-1999
<INVESTMENTS-AT-COST> 706024
<INVESTMENTS-AT-VALUE> 841607
<RECEIVABLES> 33787
<ASSETS-OTHER> 4684
<OTHER-ITEMS-ASSETS> 0
<TOTAL-ASSETS> 880078
<PAYABLE-FOR-SECURITIES> 9192
<SENIOR-LONG-TERM-DEBT> 0
<OTHER-ITEMS-LIABILITIES> 4625
<TOTAL-LIABILITIES> 13817
<SENIOR-EQUITY> 0
<PAID-IN-CAPITAL-COMMON> 575794
<SHARES-COMMON-STOCK> 4852<F1>
<SHARES-COMMON-PRIOR> 4889<F1>
<ACCUMULATED-NII-CURRENT> (5888)
<OVERDISTRIBUTION-NII> 0
<ACCUMULATED-NET-GAINS> 160856
<OVERDISTRIBUTION-GAINS> 0
<ACCUM-APPREC-OR-DEPREC> 135499
<NET-ASSETS> 77136<F1>
<DIVIDEND-INCOME> 134<F1>
<INTEREST-INCOME> 53<F1>
<OTHER-INCOME> (16)<F1>
<EXPENSES-NET> (841)<F1>
<NET-INVESTMENT-INCOME> (670)<F1>
<REALIZED-GAINS-CURRENT> 171030
<APPREC-INCREASE-CURRENT> 75965
<NET-CHANGE-FROM-OPS> 241114
<EQUALIZATION> 0
<DISTRIBUTIONS-OF-INCOME> 0<F1>
<DISTRIBUTIONS-OF-GAINS> 0<F1>
<DISTRIBUTIONS-OTHER> 0
<NUMBER-OF-SHARES-SOLD> 539<F1>
<NUMBER-OF-SHARES-REDEEMED> (632)<F1>
<SHARES-REINVESTED> 56<F1>
<NET-CHANGE-IN-ASSETS> 147702
<ACCUMULATED-NII-PRIOR> (8)
<ACCUMULATED-GAINS-PRIOR> 0
<OVERDISTRIB-NII-PRIOR> 0
<OVERDIST-NET-GAINS-PRIOR> 0
<GROSS-ADVISORY-FEES> 351<F1>
<INTEREST-EXPENSE> 0
<GROSS-EXPENSE> 841<F1>
<AVERAGE-NET-ASSETS> 70650<F1>
<PER-SHARE-NAV-BEGIN> 11.98<F1>
<PER-SHARE-NII> (.13)<F1>
<PER-SHARE-GAIN-APPREC> 4.21<F1>
<PER-SHARE-DIVIDEND> 0<F1>
<PER-SHARE-DISTRIBUTIONS> (.16)<F1>
<RETURNS-OF-CAPITAL> 0
<PER-SHARE-NAV-END> 15.90<F1>
<EXPENSE-RATIO> 2.40<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>034
<NAME> SELIGMAN HENDERSON GLOBAL TECHNOLOGY FUND CLASS D
<MULTIPLIER> 1000
<S> <C>
<PERIOD-TYPE> 6-MOS
<FISCAL-YEAR-END> OCT-31-1999
<PERIOD-END> APR-30-1999
<INVESTMENTS-AT-COST> 706024
<INVESTMENTS-AT-VALUE> 841607
<RECEIVABLES> 33787
<ASSETS-OTHER> 4684
<OTHER-ITEMS-ASSETS> 0
<TOTAL-ASSETS> 880078
<PAYABLE-FOR-SECURITIES> 9192
<SENIOR-LONG-TERM-DEBT> 0
<OTHER-ITEMS-LIABILITIES> 4625
<TOTAL-LIABILITIES> 13817
<SENIOR-EQUITY> 0
<PAID-IN-CAPITAL-COMMON> 575794
<SHARES-COMMON-STOCK> 13899<F1>
<SHARES-COMMON-PRIOR> 15383<F1>
<ACCUMULATED-NII-CURRENT> (5888)
<OVERDISTRIBUTION-NII> 0
<ACCUMULATED-NET-GAINS> 160856
<OVERDISTRIBUTION-GAINS> 0
<ACCUM-APPREC-OR-DEPREC> 135499
<NET-ASSETS> 220627<F1>
<DIVIDEND-INCOME> 408<F1>
<INTEREST-INCOME> 161<F1>
<OTHER-INCOME> (47)<F1>
<EXPENSES-NET> (2554)<F1>
<NET-INVESTMENT-INCOME> (2032)<F1>
<REALIZED-GAINS-CURRENT> 171030
<APPREC-INCREASE-CURRENT> 75965
<NET-CHANGE-FROM-OPS> 241114
<EQUALIZATION> 0
<DISTRIBUTIONS-OF-INCOME> 0<F1>
<DISTRIBUTIONS-OF-GAINS> 0<F1>
<DISTRIBUTIONS-OTHER> 0
<NUMBER-OF-SHARES-SOLD> 3273<F1>
<NUMBER-OF-SHARES-REDEEMED> (4934)<F1>
<SHARES-REINVESTED> 177<F1>
<NET-CHANGE-IN-ASSETS> 147702
<ACCUMULATED-NII-PRIOR> (8)
<ACCUMULATED-GAINS-PRIOR> 0
<OVERDISTRIB-NII-PRIOR> 0
<OVERDIST-NET-GAINS-PRIOR> 0
<GROSS-ADVISORY-FEES> 1065<F1>
<INTEREST-EXPENSE> 0
<GROSS-EXPENSE> 2554<F1>
<AVERAGE-NET-ASSETS> 214689<F1>
<PER-SHARE-NAV-BEGIN> 11.96<F1>
<PER-SHARE-NII> (.13)<F1>
<PER-SHARE-GAIN-APPREC> 4.20<F1>
<PER-SHARE-DIVIDEND> (.16)<F1>
<PER-SHARE-DISTRIBUTIONS> 0<F1>
<RETURNS-OF-CAPITAL> 0
<PER-SHARE-NAV-END> 15.87<F1>
<EXPENSE-RATIO> 2.40<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>041
<NAME> SELIGMAN HENDERSON GLOBAL GROWTH OPPORTUNITIES FUND CLASS A
<MULTIPLIER> 1000
<S> <C>
<PERIOD-TYPE> 6-MOS
<FISCAL-YEAR-END> OCT-31-1999
<PERIOD-END> APR-30-1999
<INVESTMENTS-AT-COST> 136653
<INVESTMENTS-AT-VALUE> 200949
<RECEIVABLES> 3229
<ASSETS-OTHER> 8848
<OTHER-ITEMS-ASSETS> 0
<TOTAL-ASSETS> 213026
<PAYABLE-FOR-SECURITIES> 330
<SENIOR-LONG-TERM-DEBT> 0
<OTHER-ITEMS-LIABILITIES> 1159
<TOTAL-LIABILITIES> 1489
<SENIOR-EQUITY> 0
<PAID-IN-CAPITAL-COMMON> 126101
<SHARES-COMMON-STOCK> 9374<F1>
<SHARES-COMMON-PRIOR> 10177<F1>
<ACCUMULATED-NII-CURRENT> (1012)
<OVERDISTRIBUTION-NII> 0
<ACCUMULATED-NET-GAINS> 21972
<OVERDISTRIBUTION-GAINS> 0
<ACCUM-APPREC-OR-DEPREC> 64476
<NET-ASSETS> 109537<F1>
<DIVIDEND-INCOME> 427<F1>
<INTEREST-INCOME> 145<F1>
<OTHER-INCOME> (27)<F1>
<EXPENSES-NET> (889)<F1>
<NET-INVESTMENT-INCOME> (344)<F1>
<REALIZED-GAINS-CURRENT> 21585
<APPREC-INCREASE-CURRENT> 17621
<NET-CHANGE-FROM-OPS> 38197
<EQUALIZATION> 0
<DISTRIBUTIONS-OF-INCOME> 0
<DISTRIBUTIONS-OF-GAINS> 0<F1>
<DISTRIBUTIONS-OTHER> 0
<NUMBER-OF-SHARES-SOLD> 4128<F1>
<NUMBER-OF-SHARES-REDEEMED> (4931)<F1>
<SHARES-REINVESTED> 0<F1>
<NET-CHANGE-IN-ASSETS> 27217
<ACCUMULATED-NII-PRIOR> (3)
<ACCUMULATED-GAINS-PRIOR> 387
<OVERDISTRIB-NII-PRIOR> 0
<OVERDIST-NET-GAINS-PRIOR> 0
<GROSS-ADVISORY-FEES> 527<F1>
<INTEREST-EXPENSE> 0
<GROSS-EXPENSE> 889<F1>
<AVERAGE-NET-ASSETS> 106146<F1>
<PER-SHARE-NAV-BEGIN> 9.62<F1>
<PER-SHARE-NII> (.03)<F1>
<PER-SHARE-GAIN-APPREC> 2.09<F1>
<PER-SHARE-DIVIDEND> 0
<PER-SHARE-DISTRIBUTIONS> 0<F1>
<RETURNS-OF-CAPITAL> 0
<PER-SHARE-NAV-END> 11.68<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>
WARNING: THE EDGAR SYSTEM ENCOUNTERED ERROR(S) WHILE PROCESSING THIS SCHEDULE.
<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-31-1999
<PERIOD-END> APR-30-1999
<INVESTMENTS-AT-COST> 136653
<INVESTMENTS-AT-VALUE> 200949
<RECEIVABLES> 3229
<ASSETS-OTHER> 8848
<OTHER-ITEMS-ASSETS> 0
<TOTAL-ASSETS> 213026
<PAYABLE-FOR-SECURITIES> 330
<SENIOR-LONG-TERM-DEBT> 0
<OTHER-ITEMS-LIABILITIES> 1159
<TOTAL-LIABILITIES> 1489
<SENIOR-EQUITY> 0
<PAID-IN-CAPITAL-COMMON> 126101
<SHARES-COMMON-STOCK> 2581<F1>
<SHARES-COMMON-PRIOR> 2333<F1>
<ACCUMULATED-NII-CURRENT> (1012)
<OVERDISTRIBUTION-NII> 0
<ACCUMULATED-NET-GAINS> 21972
<OVERDISTRIBUTION-GAINS> 0
<ACCUM-APPREC-OR-DEPREC> 64476
<NET-ASSETS> 29353<F1>
<DIVIDEND-INCOME> 105<F1>
<INTEREST-INCOME> 36<F1>
<OTHER-INCOME> (7)<F1>
<EXPENSES-NET> (314)<F1>
<NET-INVESTMENT-INCOME> (180)<F1>
<REALIZED-GAINS-CURRENT> 21585
<APPREC-INCREASE-CURRENT> 17621
<NET-CHANGE-FROM-OPS> 38197
<EQUALIZATION> 0
<DISTRIBUTIONS-OF-INCOME> 0
<DISTRIBUTIONS-OF-GAINS> 0<F1>
<DISTRIBUTIONS-OTHER> 0
<NUMBER-OF-SHARES-SOLD> 595<F1>
<NUMBER-OF-SHARES-REDEEMED> (347)<F1>
<SHARES-REINVESTED> 0<F1>
<NET-CHANGE-IN-ASSETS> 27217
<ACCUMULATED-NII-PRIOR> (3)
<ACCUMULATED-GAINS-PRIOR> 387
<OVERDISTRIB-NII-PRIOR> 0
<OVERDIST-NET-GAINS-PRIOR> 0
<GROSS-ADVISORY-FEES> 129<F1>
<INTEREST-EXPENSE> 0
<GROSS-EXPENSE> 314<F1>
<AVERAGE-NET-ASSETS> 26010<F1>
<PER-SHARE-NAV-BEGIN> 9.40<F1>
<PER-SHARE-NII> (.07)<F1>
<PER-SHARE-GAIN-APPREC> 2.04<F1>
<PER-SHARE-DIVIDEND> 0
<PER-SHARE-DISTRIBUTIONS> 0<F1>
<RETURNS-OF-CAPITAL> 0
<PER-SHARE-NAV-END> 11.37<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>
WARNING: THE EDGAR SYSTEM ENCOUNTERED ERROR(S) WHILE PROCESSING THIS SCHEDULE.
<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-31-1999
<PERIOD-END> APR-30-1999
<INVESTMENTS-AT-COST> 136653
<INVESTMENTS-AT-VALUE> 200949
<RECEIVABLES> 3229
<ASSETS-OTHER> 8848
<OTHER-ITEMS-ASSETS> 0
<TOTAL-ASSETS> 213026
<PAYABLE-FOR-SECURITIES> 330
<SENIOR-LONG-TERM-DEBT> 0
<OTHER-ITEMS-LIABILITIES> 1159
<TOTAL-LIABILITIES> 1489
<SENIOR-EQUITY> 0
<PAID-IN-CAPITAL-COMMON> 126101
<SHARES-COMMON-STOCK> 6388<F1>
<SHARES-COMMON-PRIOR> 6857<F1>
<ACCUMULATED-NII-CURRENT> (1012)
<OVERDISTRIBUTION-NII> 0
<ACCUMULATED-NET-GAINS> 21972
<OVERDISTRIBUTION-GAINS> 0
<ACCUM-APPREC-OR-DEPREC> 64476
<NET-ASSETS> 72647<F1>
<DIVIDEND-INCOME> 285<F1>
<INTEREST-INCOME> 96<F1>
<OTHER-INCOME> (18)<F1>
<EXPENSES-NET> (848)<F1>
<NET-INVESTMENT-INCOME> (485)<F1>
<REALIZED-GAINS-CURRENT> 21585
<APPREC-INCREASE-CURRENT> 17621
<NET-CHANGE-FROM-OPS> 38197
<EQUALIZATION> 0
<DISTRIBUTIONS-OF-INCOME> 0
<DISTRIBUTIONS-OF-GAINS> 0<F1>
<DISTRIBUTIONS-OTHER> 0
<NUMBER-OF-SHARES-SOLD> 830<F1>
<NUMBER-OF-SHARES-REDEEMED> (1299)<F1>
<SHARES-REINVESTED> 0<F1>
<NET-CHANGE-IN-ASSETS> 27217
<ACCUMULATED-NII-PRIOR> (3)
<ACCUMULATED-GAINS-PRIOR> 387
<OVERDISTRIB-NII-PRIOR> 0
<OVERDIST-NET-GAINS-PRIOR> 0
<GROSS-ADVISORY-FEES> 384<F1>
<INTEREST-EXPENSE> 0
<GROSS-EXPENSE> 848<F1>
<AVERAGE-NET-ASSETS> 70253<F1>
<PER-SHARE-NAV-BEGIN> 9.40<F1>
<PER-SHARE-NII> (.07)<F1>
<PER-SHARE-GAIN-APPREC> 2.04<F1>
<PER-SHARE-DIVIDEND> 0
<PER-SHARE-DISTRIBUTIONS> 0<F1>
<RETURNS-OF-CAPITAL> 0
<PER-SHARE-NAV-END> 11.37<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>
WARNING: THE EDGAR SYSTEM ENCOUNTERED ERROR(S) WHILE PROCESSING THIS SCHEDULE.
<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-31-1999
<PERIOD-END> APR-30-1999
<INVESTMENTS-AT-COST> 45972
<INVESTMENTS-AT-VALUE> 54038
<RECEIVABLES> 2922
<ASSETS-OTHER> 6568
<OTHER-ITEMS-ASSETS> 0
<TOTAL-ASSETS> 63528
<PAYABLE-FOR-SECURITIES> 2740
<SENIOR-LONG-TERM-DEBT> 0
<OTHER-ITEMS-LIABILITIES> 2838
<TOTAL-LIABILITIES> 5578
<SENIOR-EQUITY> 0
<PAID-IN-CAPITAL-COMMON> 73054
<SHARES-COMMON-STOCK> 4274<F1>
<SHARES-COMMON-PRIOR> 4689<F1>
<ACCUMULATED-NII-CURRENT> (564)
<OVERDISTRIBUTION-NII> 0
<ACCUMULATED-NET-GAINS> (22570)
<OVERDISTRIBUTION-GAINS> 0
<ACCUM-APPREC-OR-DEPREC> 8030
<NET-ASSETS> 28142<F1>
<DIVIDEND-INCOME> 166<F1>
<INTEREST-INCOME> 16<F1>
<OTHER-INCOME> (89)<F1>
<EXPENSES-NET> (301)<F1>
<NET-INVESTMENT-INCOME> (208)<F1>
<REALIZED-GAINS-CURRENT> 319
<APPREC-INCREASE-CURRENT> 12918
<NET-CHANGE-FROM-OPS> 12674
<EQUALIZATION> 0
<DISTRIBUTIONS-OF-INCOME> 0
<DISTRIBUTIONS-OF-GAINS> 0<F1>
<DISTRIBUTIONS-OTHER> 0
<NUMBER-OF-SHARES-SOLD> 8893<F1>
<NUMBER-OF-SHARES-REDEEMED> (9308)<F1>
<SHARES-REINVESTED> 0<F1>
<NET-CHANGE-IN-ASSETS> 3958
<ACCUMULATED-NII-PRIOR> (2)
<ACCUMULATED-GAINS-PRIOR> (22889)
<OVERDISTRIB-NII-PRIOR> 0
<OVERDIST-NET-GAINS-PRIOR> 0
<GROSS-ADVISORY-FEES> 145<F1>
<INTEREST-EXPENSE> 0
<GROSS-EXPENSE> (301)<F1>
<AVERAGE-NET-ASSETS> 23559<F1>
<PER-SHARE-NAV-BEGIN> 5.18<F1>
<PER-SHARE-NII> (.03)<F1>
<PER-SHARE-GAIN-APPREC> 1.44<F1>
<PER-SHARE-DIVIDEND> 0
<PER-SHARE-DISTRIBUTIONS> 0
<RETURNS-OF-CAPITAL> 0
<PER-SHARE-NAV-END> 6.59<F1>
<EXPENSE-RATIO> 2.58<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>052
<NAME> SELIGMAN HENDERSON EMERGING MARKETS GROWTH FUND CLASS B
<MULTIPLIER> 1000
<S> <C>
<PERIOD-TYPE> 6-MOS
<FISCAL-YEAR-END> OCT-31-1999
<PERIOD-END> APR-30-1999
<INVESTMENTS-AT-COST> 45972
<INVESTMENTS-AT-VALUE> 54038
<RECEIVABLES> 2922
<ASSETS-OTHER> 6568
<OTHER-ITEMS-ASSETS> 0
<TOTAL-ASSETS> 63528
<PAYABLE-FOR-SECURITIES> 2740
<SENIOR-LONG-TERM-DEBT> 0
<OTHER-ITEMS-LIABILITIES> 2838
<TOTAL-LIABILITIES> 5578
<SENIOR-EQUITY> 0
<PAID-IN-CAPITAL-COMMON> 73054
<SHARES-COMMON-STOCK> 2521<F1>
<SHARES-COMMON-PRIOR> 3151<F1>
<ACCUMULATED-NII-CURRENT> (564)
<OVERDISTRIBUTION-NII> 0
<ACCUMULATED-NET-GAINS> (22570)
<OVERDISTRIBUTION-GAINS> 0
<ACCUM-APPREC-OR-DEPREC> 8030
<NET-ASSETS> 16237<F1>
<DIVIDEND-INCOME> 108<F1>
<INTEREST-INCOME> 11<F1>
<OTHER-INCOME> (58)<F1>
<EXPENSES-NET> (255)<F1>
<NET-INVESTMENT-INCOME> (194)<F1>
<REALIZED-GAINS-CURRENT> 319
<APPREC-INCREASE-CURRENT> 12918
<NET-CHANGE-FROM-OPS> 12674
<EQUALIZATION> 0
<DISTRIBUTIONS-OF-INCOME> 0
<DISTRIBUTIONS-OF-GAINS> 0<F1>
<DISTRIBUTIONS-OTHER> 0
<NUMBER-OF-SHARES-SOLD> 250<F1>
<NUMBER-OF-SHARES-REDEEMED> (880)<F1>
<SHARES-REINVESTED> 0<F1>
<NET-CHANGE-IN-ASSETS> 3958
<ACCUMULATED-NII-PRIOR> (2)
<ACCUMULATED-GAINS-PRIOR> (22889)
<OVERDISTRIB-NII-PRIOR> 0
<OVERDIST-NET-GAINS-PRIOR> 0
<GROSS-ADVISORY-FEES> 96<F1>
<INTEREST-EXPENSE> 0
<GROSS-EXPENSE> (255)<F1>
<AVERAGE-NET-ASSETS> 15424<F1>
<PER-SHARE-NAV-BEGIN> 5.09<F1>
<PER-SHARE-NII> (.05)<F1>
<PER-SHARE-GAIN-APPREC> 1.40<F1>
<PER-SHARE-DIVIDEND> 0
<PER-SHARE-DISTRIBUTIONS> 0
<RETURNS-OF-CAPITAL> 0
<PER-SHARE-NAV-END> 6.44<F1>
<EXPENSE-RATIO> 3.33<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>054
<NAME> SELIGMAN HENDERSON EMERGING MARKETS GROWTH FUND CLASS D
<MULTIPLIER> 1000
<S> <C>
<PERIOD-TYPE> 6-MOS
<FISCAL-YEAR-END> OCT-31-1999
<PERIOD-END> APR-30-1999
<INVESTMENTS-AT-COST> 45972
<INVESTMENTS-AT-VALUE> 54038
<RECEIVABLES> 2922
<ASSETS-OTHER> 6568
<OTHER-ITEMS-ASSETS> 0
<TOTAL-ASSETS> 63528
<PAYABLE-FOR-SECURITIES> 2740
<SENIOR-LONG-TERM-DEBT> 0
<OTHER-ITEMS-LIABILITIES> 2838
<TOTAL-LIABILITIES> 5578
<SENIOR-EQUITY> 0
<PAID-IN-CAPITAL-COMMON> 73054
<SHARES-COMMON-STOCK> 2104<F1>
<SHARES-COMMON-PRIOR> 2683<F1>
<ACCUMULATED-NII-CURRENT> (564)
<OVERDISTRIBUTION-NII> 0
<ACCUMULATED-NET-GAINS> (22570)
<OVERDISTRIBUTION-GAINS> 0
<ACCUM-APPREC-OR-DEPREC> 8030
<NET-ASSETS> 13571<F1>
<DIVIDEND-INCOME> 90<F1>
<INTEREST-INCOME> 9<F1>
<OTHER-INCOME> (48)<F1>
<EXPENSES-NET> (212)<F1>
<NET-INVESTMENT-INCOME> (161)<F1>
<REALIZED-GAINS-CURRENT> 319
<APPREC-INCREASE-CURRENT> 12918
<NET-CHANGE-FROM-OPS> 12674
<EQUALIZATION> 0
<DISTRIBUTIONS-OF-INCOME> 0
<DISTRIBUTIONS-OF-GAINS> 0<F1>
<DISTRIBUTIONS-OTHER> 0
<NUMBER-OF-SHARES-SOLD> 491<F1>
<NUMBER-OF-SHARES-REDEEMED> (1070)<F1>
<SHARES-REINVESTED> 0<F1>
<NET-CHANGE-IN-ASSETS> 3958
<ACCUMULATED-NII-PRIOR> (2)
<ACCUMULATED-GAINS-PRIOR> (22889)
<OVERDISTRIB-NII-PRIOR> 0
<OVERDIST-NET-GAINS-PRIOR> 0
<GROSS-ADVISORY-FEES> 80<F1>
<INTEREST-EXPENSE> 0
<GROSS-EXPENSE> (212)<F1>
<AVERAGE-NET-ASSETS> 12842<F1>
<PER-SHARE-NAV-BEGIN> 5.09<F1>
<PER-SHARE-NII> (.05)<F1>
<PER-SHARE-GAIN-APPREC> 1.41<F1>
<PER-SHARE-DIVIDEND> 0
<PER-SHARE-DISTRIBUTIONS> 0
<RETURNS-OF-CAPITAL> 0
<PER-SHARE-NAV-END> 6.45<F1>
<EXPENSE-RATIO> 3.33<F1>
[AVG-DEBT-OUTSTANDING] 0
[AVG-DEBT-PER-SHARE] 0
<FN>
<F1>Class D only. All other data are fund level.
</FN>
</TABLE>
