SELIGMAN HENDERSON GLOBAL FUND SERIES INC
NSAR-B, 2000-01-03
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<PAGE>      PAGE  1
000 B000000 10/31/99
000 C000000 881466
000 D000000 N
000 E000000 NF
000 F000000 Y
000 G000000 N
000 H000000 N
000 I000000 3.0.a
000 J000000 A
001 A000000 SELIGMAN HENDERSON GLOBAL FUND SERIES, INC.
001 B000000 811-6485
001 C000000 2128501864
002 A000000 100 PARK AVENUE
002 B000000 NEW YORK
002 C000000 NY
002 D010000 10017
003  000000 N
004  000000 N
005  000000 N
006  000000 N
007 A000000 Y
007 B000000  5
007 C010100  1
007 C020100 SELIGMAN HENDERSON INTERNATIONAL FUND
007 C030100 N
007 C010200  2
007 C020200 SELIGMAN HENDERSON GLOBAL SMALLER COS. FUND
007 C030200 N
007 C010300  3
007 C020300 SELIGMAN HENDERSON GLOBAL TECHNOLOGY FUND
007 C030300 N
007 C010400  4
007 C020400 SELIGMAN HENDERSON GLOBAL GROWTH OPP. FUND
007 C030400 N
007 C010500  5
007 C020500 SELIGMAN HENDERSON EMERGING MKTS GROWTH FUND
007 C030500 N
007 C010600  6
007 C010700  7
007 C010800  8
007 C010900  9
007 C011000 10
008 A00AA01 J & W SELIGMAN & CO., INC.
008 B00AA01 A
008 C00AA01 801-15798
008 D01AA01 NEW YORK
008 D02AA01 NY
008 D03AA01 10017
008 A00AA02 HENDERSON INVESTMENT MANAGEMENT LIMITED
008 B00AA02 S
008 C00AA02 801-55577
<PAGE>      PAGE  2
008 D01AA02 LONDON
008 D05AA02 ENGLAND
008 D06AA02 EC2M 2PA
011 A00AA01 SELIGMAN ADVISORS, INC.
011 B00AA01 8-25845
011 C01AA01 NEW YORK
011 C02AA01 NY
011 C03AA01 10017
012 A00AA01 SELIGMAN DATA CORP.
012 B00AA01 84-1895
012 C01AA01 NEW YORK
012 C02AA01 NY
012 C03AA01 10017
013 A00AA01 DELOITTE & TOUCHE LLP
013 B01AA01 NEW YORK
013 B02AA01 NY
013 B03AA01 10281
014 A00AA01 SELIGMAN SERVICES, INC.
014 B00AA01 8-47717
015 A00AA01 THE CHASE MANHATTAN BANK
015 B00AA01 C
015 C01AA01 BROOKLYN
015 C02AA01 NY
015 C03AA01 11201
015 E01AA01 X
018  00AA00 Y
019 A00AA00 Y
019 B00AA00   54
019 C00AA00 JWSELIGMAN
020 A000001 MERRILL LYNCH, PIERCE, FENNER & SMITH INC.
020 B000001 13-5674085
020 C000001    397
020 A000002 WARBURG, DILLON, READ, LLC.
020 B000002 13-3873456
020 C000002    374
020 A000003 INSTINET CORPORATION
020 B000003 13-3443395
020 C000003    333
020 A000004 CREDIT SUISSE FIRST BOSTON CORPORATION
020 B000004 13-5659485
020 C000004    322
020 A000005 GOLDMAN, SACHS & CO.
020 B000005 13-5108880
020 C000005    174
020 A000006 LEHMAN BROTHERS INC.
020 B000006 13-2518466
020 C000006    169
020 A000007 HSBC JAMES CAPEL
020 B000007 13-2650272
020 C000007    146
020 A000008 MORGAN STANLEY & CO., INC.
<PAGE>      PAGE  3
020 B000008 13-2655998
020 C000008    132
020 A000009 ABN-AMRO HOARE GOVETT
020 B000009 NA-FOREIGN
020 C000009    124
020 A000010 DRESDNER KLEINWORT BENSON
020 B000010 NA-FOREIGN
020 C000010    121
021  000000     4523
022 A000001 GOLDMAN, SACHS & CO.
022 B000001 13-5108880
022 C000001     69116
022 D000001     58323
022 A000002 CREDIT SUISSE FIRST BOSTON CORPORATION
022 B000002 13-5659485
022 C000002     73984
022 D000002     48170
022 A000003 MERRILL LYNCH, PIERCE, FENNER & SMITH, INC.
022 B000003 13-5674085
022 C000003     53031
022 D000003     61493
022 A000004 LEHMAN BROTHERS, INC.
022 B000004 13-2518466
022 C000004     48341
022 D000004     36523
022 A000005 PRUDENTIAL SECURITIES INC.
022 B000005 22-2347336
022 C000005     49684
022 D000005     17019
022 A000006 MONTGOMERY SECURITIES
022 B000006 94-1701676
022 C000006     15776
022 D000006     48975
022 A000007 ROBERTSON, STEPHENS & CO., INC.
022 B000007 94-2524501
022 C000007     33593
022 D000007     28616
022 A000008 MORGAN STANLEY & CO., INC.
022 B000008 13-2655998
022 C000008     46167
022 D000008     14972
022 A000009 DONALDSON, LUFKIN & JENRETTE SECURITIES, INC.
022 B000009 13-2741729
022 C000009     44593
022 D000009     15670
022 A000010 WARBURG, DILLON, READ, LLC.
022 B000010 13-3873456
022 C000010     29781
022 D000010     19643
023 C000000     780976
023 D000000     608692
<PAGE>      PAGE  4
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<PAGE>      PAGE  5
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080 A00AA00 ICI MUTUAL INSURANCE COMPANY
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<PAGE>      PAGE  6
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<PAGE>      PAGE  7
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<PAGE>      PAGE  8
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<PAGE>      PAGE  9
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<PAGE>      PAGE  10
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<PAGE>      PAGE  11
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<PAGE>      PAGE  12
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<PAGE>      PAGE  13
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<PAGE>      PAGE  14
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<PAGE>      PAGE  15
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<PAGE>      PAGE  16
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<PAGE>      PAGE  17
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042 B000400   0
042 C000400   0
042 D000400 100
042 E000400   0
042 F000400   0
<PAGE>      PAGE  19
042 G000400   0
042 H000400   0
043  000400   1297
044  000400      0
045  000400 Y
046  000400 Y
047  000400 Y
048  000400  1.000
048 A010400        0
048 A020400 0.000
048 B010400        0
048 B020400 0.000
048 C010400        0
048 C020400 0.000
048 D010400        0
048 D020400 0.000
048 E010400        0
048 E020400 0.000
048 F010400        0
048 F020400 0.000
048 G010400        0
048 G020400 0.000
048 H010400        0
048 H020400 0.000
048 I010400        0
048 I020400 0.000
048 J010400        0
048 J020400 0.000
048 K010400        0
048 K020400 0.000
055 A000400 N
055 B000400 N
056  000400 Y
057  000400 N
066 A000400 Y
066 B000400 N
066 C000400 Y
066 D000400 N
066 E000400 N
066 F000400 N
066 G000400 N
067  000400 N
068 A000400 N
068 B000400 Y
069  000400 N
070 A010400 Y
070 A020400 N
070 B010400 N
070 B020400 N
070 C010400 N
070 C020400 N
<PAGE>      PAGE  20
070 D010400 N
070 D020400 N
070 E010400 N
070 E020400 N
070 F010400 N
070 F020400 N
070 G010400 N
070 G020400 N
070 H010400 N
070 H020400 N
070 I010400 N
070 I020400 N
070 J010400 Y
070 J020400 Y
070 K010400 Y
070 K020400 N
070 L010400 Y
070 L020400 Y
070 M010400 Y
070 M020400 Y
070 N010400 Y
070 N020400 N
070 O010400 Y
070 O020400 N
070 P010400 Y
070 P020400 N
070 Q010400 N
070 Q020400 N
070 R010400 Y
070 R020400 N
071 A000400    129989
071 B000400    139018
071 C000400    199507
071 D000400   65
072 A000400 12
072 B000400      443
072 C000400     1991
072 D000400        0
072 E000400      -90
072 F000400     2115
072 G000400        0
072 H000400        0
072 I000400      536
072 J000400      142
072 K000400       44
072 L000400       88
072 M000400       10
072 N000400       30
072 O000400        1
072 P000400        0
072 Q000400        0
<PAGE>      PAGE  21
072 R000400       52
072 S000400       12
072 T000400     1297
072 U000400        0
072 V000400        0
072 W000400        8
072 X000400     4335
072 Y000400        0
072 Z000400    -1991
072AA000400    46132
072BB000400     6355
072CC010400    21917
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    10336
074 B000400        0
074 C000400        0
074 D000400      132
074 E000400        0
074 F000400   223277
074 G000400        0
074 H000400        0
074 I000400        0
074 J000400     1030
074 K000400       74
074 L000400     1053
074 M000400       35
074 N000400   235937
074 O000400       70
074 P000400      211
074 Q000400        0
074 R010400        0
074 R020400        0
074 R030400        0
074 R040400      704
074 S000400        0
074 T000400   234952
074 U010400     9403
074 U020400     6223
074 V010400    12.86
074 V020400    12.47
074 W000400   0.0000
074 X000400    13714
074 Y000400        0
075 A000400        0
<PAGE>      PAGE  22
075 B000400   210482
076  000400     0.00
028 A010500     15150
028 A020500         0
028 A030500         0
028 A040500     16477
028 B010500     17877
028 B020500         0
028 B030500         0
028 B040500     12552
028 C010500      9171
028 C020500         0
028 C030500         0
028 C040500     11677
028 D010500      5736
028 D020500         0
028 D030500         0
028 D040500      6124
028 E010500     10132
028 E020500         0
028 E030500         0
028 E040500     10237
028 F010500      8591
028 F020500         0
028 F030500         0
028 F040500      8478
028 G010500     66657
028 G020500         0
028 G030500         0
028 G040500     65545
028 H000500       674
029  000500 Y
030 A000500     36
030 B000500  4.75
030 C000500  0.00
031 A000500      4
031 B000500      0
032  000500     31
033  000500      1
034  000500 Y
035  000500    148
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
<PAGE>      PAGE  23
043  000500    365
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
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
<PAGE>      PAGE  24
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     74024
071 B000500     81706
071 C000500     54054
071 D000500  137
072 A000500 12
072 B000500       43
072 C000500      788
072 D000500        0
072 E000500     -334
072 F000500      706
072 G000500        0
072 H000500        0
072 I000500      287
072 J000500      108
072 K000500       34
072 L000500       83
072 M000500        8
072 N000500       40
072 O000500        1
072 P000500        0
072 Q000500        0
072 R000500       35
072 S000500        9
<PAGE>      PAGE  25
072 T000500      365
072 U000500        0
072 V000500        0
072 W000500        3
072 X000500     1679
072 Y000500        0
072 Z000500    -1182
072AA000500    17189
072BB000500    12729
072CC010500    10446
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     2089
074 B000500        0
074 C000500        0
074 D000500        0
074 E000500        0
074 F000500    58198
074 G000500        0
074 H000500        0
074 I000500        0
074 J000500        0
074 K000500       44
074 L000500      215
074 M000500       13
074 N000500    60559
074 O000500        0
074 P000500       65
074 Q000500        0
074 R010500        0
074 R020500        0
074 R030500        0
074 R040500      381
074 S000500        0
074 T000500    60113
074 U010500     4608
074 U020500     1970
074 V010500     6.69
074 V020500     6.52
074 W000500   0.0000
074 X000500     9954
074 Y000500        0
075 A000500        0
075 B000500    55963
076  000500     0.00
<PAGE>      PAGE  26
SIGNATURE   THOMAS G. ROSE
TITLE       TREASURER



INDEPENDENT AUDITORS' REPORT
Seligman   Henderson   Global
Fund Series, Inc.


In planning and  performing  our audit of the  financial  statements of Seligman
Henderson Global Fund Series,  Inc. (the "Fund")  (including  Seligman Henderson
International  Fund,  Seligman Henderson Emerging Markets Growth Fund,  Seligman
Henderson Global Growth  Opportunities  Fund,  Seligman Henderson Global Smaller
Companies Fund and Seligman Henderson Global Technology Fund) for the year ended
October 31, 1999 (on which we have issued our report dated  December 10,  1999),
we  considered  its  internal   control,   including   control   activities  for
safeguarding  securities,  in order to determine our auditing procedures for the
purpose of expressing our opinion on the financial statements and to comply with
the  requirements  of Form  N-SAR,  and not to provide  assurance  on the Fund's
internal control.

The  management of the Fund is  responsible  for  establishing  and  maintaining
internal control. In fulfilling this responsibility,  estimates and judgments by
management  are  required to assess the expected  benefits and related  costs of
controls.  Generally,  controls  that are  relevant  to an audit  pertain to the
entity's objective of preparing financial  statements for external purposes that
are  fairly   presented  in  conformity  with  generally   accepted   accounting
principles.   Those  controls   include  the   safeguarding  of  assets  against
unauthorized acquisition, use, or disposition.

Because of inherent  limitations in any internal  control,  misstatements due to
error  or  fraud  may  occur  and  not be  detected.  Also,  projections  of any
evaluation  of internal  control to future  periods are subject to the risk that
the internal control may be become inadequate  because of changes in conditions,
or that the degree of compliance with policies or procedures may deteriorate.

Our consideration of the Fund's internal control would not necessarily  disclose
all matters in the  internal  control  that might be material  weaknesses  under
standards established by the American Institute of Certified Public Accountants.
A material  weakness is a condition  in which the design or  operation of one or
more of the internal  control  components  does not reduce to a  relatively  low
level the risk that misstatements caused by error or fraud in amounts that would
be material in relation to the financial  statements being audited may occur and
not be detected  within a timely  period by  employees  in the normal  course of
performing their assigned functions.  However, we noted no matters involving the
Fund's internal control and its operation,  including  controls for safeguarding
securities,  that we consider to be material  weaknesses  as defined above as of
October 31, 1999.

This report is intended solely for the  information  and use of management,  and
the Board of Directors of Seligman  Henderson Global Fund Series,  Inc., and the
Securities and Exchange Commission and is not intended and should not be used by
anyone other than these specified parties.



/s/Deloitte & Touche LLP
New York, New York
December 10, 1999




WARNING: THE EDGAR SYSTEM ENCOUNTERED ERROR(S) WHILE PROCESSING THIS SCHEDULE.

<TABLE> <S> <C>


<ARTICLE> 6
[NUMBER]011
        <NAME> SELIGMAN HENDERSON INTERNATIONAL FUND CLASS A
<MULTIPLIER> 1000

<S>                             <C>
<PERIOD-TYPE>                 12-MOS
<FISCAL-YEAR-END>                          OCT-31-1999
<PERIOD-END>                               OCT-31-1999
<INVESTMENTS-AT-COST>                            70221
<INVESTMENTS-AT-VALUE>                           85369
<RECEIVABLES>                                     1410
<ASSETS-OTHER>                                    8846
<OTHER-ITEMS-ASSETS>                                 0
<TOTAL-ASSETS>                                   95625
<PAYABLE-FOR-SECURITIES>                          1622
<SENIOR-LONG-TERM-DEBT>                              0
<OTHER-ITEMS-LIABILITIES>                          717
<TOTAL-LIABILITIES>                               2339
<SENIOR-EQUITY>                                      0
<PAID-IN-CAPITAL-COMMON>                         70435
<SHARES-COMMON-STOCK>                             2085<F1>
<SHARES-COMMON-PRIOR>                             2485<F1>
<ACCUMULATED-NII-CURRENT>                        (509)
<OVERDISTRIBUTION-NII>                               0
<ACCUMULATED-NET-GAINS>                           8259
<OVERDISTRIBUTION-GAINS>                             0
<ACCUM-APPREC-OR-DEPREC>                         15101
<NET-ASSETS>                                     44763<F1>
<DIVIDEND-INCOME>                                  748<F1>
<INTEREST-INCOME>                                   42<F1>
<OTHER-INCOME>                                      22<F1>
<EXPENSES-NET>                                   (815)<F1>
<NET-INVESTMENT-INCOME>                            (3)<F1>
<REALIZED-GAINS-CURRENT>                         17064
<APPREC-INCREASE-CURRENT>                         1429
<NET-CHANGE-FROM-OPS>                            18119
<EQUALIZATION>                                       0
<DISTRIBUTIONS-OF-INCOME>                            0
<DISTRIBUTIONS-OF-GAINS>                             0<F1>
<DISTRIBUTIONS-OTHER>                                0
<NUMBER-OF-SHARES-SOLD>                           6997<F1>
<NUMBER-OF-SHARES-REDEEMED>                     (7397)<F1>
<SHARES-REINVESTED>                                  0<F1>
<NET-CHANGE-IN-ASSETS>                            1845
<ACCUMULATED-NII-PRIOR>                           (12)
<ACCUMULATED-GAINS-PRIOR>                          955
<OVERDISTRIB-NII-PRIOR>                              0
<OVERDIST-NET-GAINS-PRIOR>                           0
<GROSS-ADVISORY-FEES>                              432<F1>
<INTEREST-EXPENSE>                                   0
<GROSS-EXPENSE>                                  (815)<F1>
<AVERAGE-NET-ASSETS>                             43209<F1>
<PER-SHARE-NAV-BEGIN>                            17.75<F1>
<PER-SHARE-NII>                                 (0.01)<F1>
<PER-SHARE-GAIN-APPREC>                           3.73<F1>
<PER-SHARE-DIVIDEND>                                 0
<PER-SHARE-DISTRIBUTIONS>                            0<F1>
<RETURNS-OF-CAPITAL>                                 0
<PER-SHARE-NAV-END>                              21.47<F1>
<EXPENSE-RATIO>                                   1.88<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
[NUMBER]012
        <NAME> SELIGMAN HENDERSON INTERNATIONAL FUND CLASS B
<MULTIPLIER> 1000

<S>                             <C>
<PERIOD-TYPE>                 12-MOS
<FISCAL-YEAR-END>                          OCT-31-1999
<PERIOD-END>                               OCT-31-1999
<INVESTMENTS-AT-COST>                            70221
<INVESTMENTS-AT-VALUE>                           85369
<RECEIVABLES>                                     1410
<ASSETS-OTHER>                                    8846
<OTHER-ITEMS-ASSETS>                                 0
<TOTAL-ASSETS>                                   95625
<PAYABLE-FOR-SECURITIES>                          1622
<SENIOR-LONG-TERM-DEBT>                              0
<OTHER-ITEMS-LIABILITIES>                          717
<TOTAL-LIABILITIES>                               2339
<SENIOR-EQUITY>                                      0
<PAID-IN-CAPITAL-COMMON>                         70435
<SHARES-COMMON-STOCK>                              562<F1>
<SHARES-COMMON-PRIOR>                              581<F1>
<ACCUMULATED-NII-CURRENT>                        (509)
<OVERDISTRIBUTION-NII>                               0
<ACCUMULATED-NET-GAINS>                           8259
<OVERDISTRIBUTION-GAINS>                             0
<ACCUM-APPREC-OR-DEPREC>                         15101
<NET-ASSETS>                                     11434<F1>
<DIVIDEND-INCOME>                                  183<F1>
<INTEREST-INCOME>                                   10<F1>
<OTHER-INCOME>                                       5<F1>
<EXPENSES-NET>                                   (280)<F1>
<NET-INVESTMENT-INCOME>                           (82)<F1>
<REALIZED-GAINS-CURRENT>                         17064
<APPREC-INCREASE-CURRENT>                         1429
<NET-CHANGE-FROM-OPS>                            18119
<EQUALIZATION>                                       0
<DISTRIBUTIONS-OF-INCOME>                            0
<DISTRIBUTIONS-OF-GAINS>                             0<F1>
<DISTRIBUTIONS-OTHER>                                0
<NUMBER-OF-SHARES-SOLD>                            205<F1>
<NUMBER-OF-SHARES-REDEEMED>                      (224)<F1>
<SHARES-REINVESTED>                                  0<F1>
<NET-CHANGE-IN-ASSETS>                            1845
<ACCUMULATED-NII-PRIOR>                           (12)
<ACCUMULATED-GAINS-PRIOR>                          955
<OVERDISTRIB-NII-PRIOR>                              0
<OVERDIST-NET-GAINS-PRIOR>                           0
<GROSS-ADVISORY-FEES>                              106<F1>
<INTEREST-EXPENSE>                                   0
<GROSS-EXPENSE>                                  (280)<F1>
<AVERAGE-NET-ASSETS>                             10577<F1>
<PER-SHARE-NAV-BEGIN>                            16.93<F1>
<PER-SHARE-NII>                                 (0.15)<F1>
<PER-SHARE-GAIN-APPREC>                           3.55<F1>
<PER-SHARE-DIVIDEND>                                 0
<PER-SHARE-DISTRIBUTIONS>                            0<F1>
<RETURNS-OF-CAPITAL>                                 0
<PER-SHARE-NAV-END>                              20.33<F1>
<EXPENSE-RATIO>                                   2.64<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
[NUMBER]013
        <NAME> SELIGMAN HENDERSON INTERNATIONAL FUND CLASS C
<MULTIPLIER> 1000

<S>                             <C>
<PERIOD-TYPE>                 12-MOS
<FISCAL-YEAR-END>                          OCT-31-1999
<PERIOD-END>                               OCT-31-1999
<INVESTMENTS-AT-COST>                            70221
<INVESTMENTS-AT-VALUE>                           85369
<RECEIVABLES>                                     1410
<ASSETS-OTHER>                                    8846
<OTHER-ITEMS-ASSETS>                                 0
<TOTAL-ASSETS>                                   95625
<PAYABLE-FOR-SECURITIES>                          1622
<SENIOR-LONG-TERM-DEBT>                              0
<OTHER-ITEMS-LIABILITIES>                          717
<TOTAL-LIABILITIES>                               2339
<SENIOR-EQUITY>                                      0
<PAID-IN-CAPITAL-COMMON>                         70435
<SHARES-COMMON-STOCK>                               67<F1>
<SHARES-COMMON-PRIOR>                                0<F1>
<ACCUMULATED-NII-CURRENT>                        (509)
<OVERDISTRIBUTION-NII>                               0
<ACCUMULATED-NET-GAINS>                           8259
<OVERDISTRIBUTION-GAINS>                             0
<ACCUM-APPREC-OR-DEPREC>                         15101
<NET-ASSETS>                                      1361<F1>
<DIVIDEND-INCOME>                                    1<F1>
<INTEREST-INCOME>                                    0<F1>
<OTHER-INCOME>                                       0<F1>
<EXPENSES-NET>                                     (4)<F1>
<NET-INVESTMENT-INCOME>                            (3)<F1>
<REALIZED-GAINS-CURRENT>                         17064
<APPREC-INCREASE-CURRENT>                         1429
<NET-CHANGE-FROM-OPS>                            18119
<EQUALIZATION>                                       0
<DISTRIBUTIONS-OF-INCOME>                            0
<DISTRIBUTIONS-OF-GAINS>                             0<F1>
<DISTRIBUTIONS-OTHER>                                0
<NUMBER-OF-SHARES-SOLD>                            235<F1>
<NUMBER-OF-SHARES-REDEEMED>                      (168)<F1>
<SHARES-REINVESTED>                                  0<F1>
<NET-CHANGE-IN-ASSETS>                            1845
<ACCUMULATED-NII-PRIOR>                           (12)
<ACCUMULATED-GAINS-PRIOR>                          955
<OVERDISTRIB-NII-PRIOR>                              0
<OVERDIST-NET-GAINS-PRIOR>                           0
<GROSS-ADVISORY-FEES>                                1<F1>
<INTEREST-EXPENSE>                                   0
<GROSS-EXPENSE>                                    (4)<F1>
<AVERAGE-NET-ASSETS>                               325<F1>
<PER-SHARE-NAV-BEGIN>                            18.39<F1>
<PER-SHARE-NII>                                 (0.10)<F1>
<PER-SHARE-GAIN-APPREC>                           2.02<F1>
<PER-SHARE-DIVIDEND>                                 0
<PER-SHARE-DISTRIBUTIONS>                            0<F1>
<RETURNS-OF-CAPITAL>                                 0
<PER-SHARE-NAV-END>                              20.31<F1>
<EXPENSE-RATIO>                                   2.72<F1>
[AVG-DEBT-OUTSTANDING]                               0
[AVG-DEBT-PER-SHARE]                                 0
<FN>
<F1>Class C only. All other data are fund level.
</FN>




</TABLE>
WARNING: THE EDGAR SYSTEM ENCOUNTERED ERROR(S) WHILE PROCESSING THIS SCHEDULE.

<TABLE> <S> <C>


<ARTICLE> 6
[NUMBER]014
        <NAME> SELIGMAN HENDERSON INTERNATIONAL FUND CLASS D
<MULTIPLIER> 1000

<S>                             <C>
<PERIOD-TYPE>                 12-MOS
<FISCAL-YEAR-END>                          OCT-31-1999
<PERIOD-END>                               OCT-31-1999
<INVESTMENTS-AT-COST>                            70221
<INVESTMENTS-AT-VALUE>                           85369
<RECEIVABLES>                                     1410
<ASSETS-OTHER>                                    8846
<OTHER-ITEMS-ASSETS>                                 0
<TOTAL-ASSETS>                                   95625
<PAYABLE-FOR-SECURITIES>                          1622
<SENIOR-LONG-TERM-DEBT>                              0
<OTHER-ITEMS-LIABILITIES>                          717
<TOTAL-LIABILITIES>                               2339
<SENIOR-EQUITY>                                      0
<PAID-IN-CAPITAL-COMMON>                         70435
<SHARES-COMMON-STOCK>                             1759<F1>
<SHARES-COMMON-PRIOR>                             2215<F1>
<ACCUMULATED-NII-CURRENT>                        (509)
<OVERDISTRIBUTION-NII>                               0
<ACCUMULATED-NET-GAINS>                           8259
<OVERDISTRIBUTION-GAINS>                             0
<ACCUM-APPREC-OR-DEPREC>                         15101
<NET-ASSETS>                                     35728<F1>
<DIVIDEND-INCOME>                                  639<F1>
<INTEREST-INCOME>                                   36<F1>
<OTHER-INCOME>                                      19<F1>
<EXPENSES-NET>                                   (980)<F1>
<NET-INVESTMENT-INCOME>                          (286)<F1>
<REALIZED-GAINS-CURRENT>                         17064
<APPREC-INCREASE-CURRENT>                         1429
<NET-CHANGE-FROM-OPS>                            18119
<EQUALIZATION>                                       0
<DISTRIBUTIONS-OF-INCOME>                            0
<DISTRIBUTIONS-OF-GAINS>                             0<F1>
<DISTRIBUTIONS-OTHER>                                0
<NUMBER-OF-SHARES-SOLD>                           1979<F1>
<NUMBER-OF-SHARES-REDEEMED>                     (2435)<F1>
<SHARES-REINVESTED>                                  0<F1>
<NET-CHANGE-IN-ASSETS>                            1845
<ACCUMULATED-NII-PRIOR>                           (12)
<ACCUMULATED-GAINS-PRIOR>                          955
<OVERDISTRIB-NII-PRIOR>                              0
<OVERDIST-NET-GAINS-PRIOR>                           0
<GROSS-ADVISORY-FEES>                              371<F1>
<INTEREST-EXPENSE>                                   0
<GROSS-EXPENSE>                                  (980)<F1>
<AVERAGE-NET-ASSETS>                             37101<F1>
<PER-SHARE-NAV-BEGIN>                            16.93<F1>
<PER-SHARE-NII>                                 (0.15)<F1>
<PER-SHARE-GAIN-APPREC>                           3.53<F1>
<PER-SHARE-DIVIDEND>                                 0
<PER-SHARE-DISTRIBUTIONS>                            0<F1>
<RETURNS-OF-CAPITAL>                                 0
<PER-SHARE-NAV-END>                              20.31<F1>
<EXPENSE-RATIO>                                   2.64<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
[NUMBER]021
        <NAME> SELIGMAN HENDERSON GLOBAL SMALLER COS FUND CLASS A
<MULTIPLIER> 1000

<S>                             <C>
<PERIOD-TYPE>                 12-MOS
<FISCAL-YEAR-END>                          OCT-31-1999
<PERIOD-END>                               OCT-31-1999
<INVESTMENTS-AT-COST>                           430960
<INVESTMENTS-AT-VALUE>                          508697
<RECEIVABLES>                                    13415
<ASSETS-OTHER>                                   15869
<OTHER-ITEMS-ASSETS>                                 0
<TOTAL-ASSETS>                                  537981
<PAYABLE-FOR-SECURITIES>                          1699
<SENIOR-LONG-TERM-DEBT>                              0
<OTHER-ITEMS-LIABILITIES>                         4626
<TOTAL-LIABILITIES>                               6325
<SENIOR-EQUITY>                                      0
<PAID-IN-CAPITAL-COMMON>                        456491
<SHARES-COMMON-STOCK>                            13581<F1>
<SHARES-COMMON-PRIOR>                            26572<F1>
<ACCUMULATED-NII-CURRENT>                         (16)
<OVERDISTRIBUTION-NII>                               0
<ACCUMULATED-NET-GAINS>                         (2292)
<OVERDISTRIBUTION-GAINS>                             0
<ACCUM-APPREC-OR-DEPREC>                         77473
<NET-ASSETS>                                    213728<F1>
<DIVIDEND-INCOME>                                 2493<F1>
<INTEREST-INCOME>                                  278<F1>
<OTHER-INCOME>                                    (37)<F1>
<EXPENSES-NET>                                  (4666)<F1>
<NET-INVESTMENT-INCOME>                         (1932)<F1>
<REALIZED-GAINS-CURRENT>                         27052
<APPREC-INCREASE-CURRENT>                        49234
<NET-CHANGE-FROM-OPS>                            68510
<EQUALIZATION>                                       0
<DISTRIBUTIONS-OF-INCOME>                            0
<DISTRIBUTIONS-OF-GAINS>                             0<F1>
<DISTRIBUTIONS-OTHER>                                0
<NUMBER-OF-SHARES-SOLD>                          21834<F1>
<NUMBER-OF-SHARES-REDEEMED>                    (34825)<F1>
<SHARES-REINVESTED>                                  0<F1>
<NET-CHANGE-IN-ASSETS>                        (338721)
<ACCUMULATED-NII-PRIOR>                           (11)
<ACCUMULATED-GAINS-PRIOR>                      (18060)
<OVERDISTRIB-NII-PRIOR>                              0
<OVERDIST-NET-GAINS-PRIOR>                           0
<GROSS-ADVISORY-FEES>                             2713<F1>
<INTEREST-EXPENSE>                                   0
<GROSS-EXPENSE>                                   4666<F1>
<AVERAGE-NET-ASSETS>                            271242<F1>
<PER-SHARE-NAV-BEGIN>                            14.11<F1>
<PER-SHARE-NII>                                 (0.10)<F1>
<PER-SHARE-GAIN-APPREC>                           1.73<F1>
<PER-SHARE-DIVIDEND>                                 0
<PER-SHARE-DISTRIBUTIONS>                            0<F1>
<RETURNS-OF-CAPITAL>                                 0
<PER-SHARE-NAV-END>                              15.74<F1>
<EXPENSE-RATIO>                                   1.72<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
[NUMBER]022
        <NAME> SELIGMAN HENDERSON GLOBAL SMALLER COS FUND CLASS B
<MULTIPLIER> 1000

<S>                             <C>
<PERIOD-TYPE>                 12-MOS
<FISCAL-YEAR-END>                          OCT-31-1999
<PERIOD-END>                               OCT-31-1999
<INVESTMENTS-AT-COST>                           430960
<INVESTMENTS-AT-VALUE>                          508697
<RECEIVABLES>                                    13415
<ASSETS-OTHER>                                   15869
<OTHER-ITEMS-ASSETS>                                 0
<TOTAL-ASSETS>                                  537981
<PAYABLE-FOR-SECURITIES>                          1699
<SENIOR-LONG-TERM-DEBT>                              0
<OTHER-ITEMS-LIABILITIES>                         4626
<TOTAL-LIABILITIES>                               6325
<SENIOR-EQUITY>                                      0
<PAID-IN-CAPITAL-COMMON>                        456491
<SHARES-COMMON-STOCK>                            10428<F1>
<SHARES-COMMON-PRIOR>                            16531<F1>
<ACCUMULATED-NII-CURRENT>                         (16)
<OVERDISTRIBUTION-NII>                               0
<ACCUMULATED-NET-GAINS>                         (2292)
<OVERDISTRIBUTION-GAINS>                             0
<ACCUM-APPREC-OR-DEPREC>                         77473
<NET-ASSETS>                                    155345<F1>
<DIVIDEND-INCOME>                                 1737<F1>
<INTEREST-INCOME>                                  192<F1>
<OTHER-INCOME>                                    (27)<F1>
<EXPENSES-NET>                                  (4629)<F1>
<NET-INVESTMENT-INCOME>                         (2727)<F1>
<REALIZED-GAINS-CURRENT>                         27052
<APPREC-INCREASE-CURRENT>                        49234
<NET-CHANGE-FROM-OPS>                            68510
<EQUALIZATION>                                       0
<DISTRIBUTIONS-OF-INCOME>                            0
<DISTRIBUTIONS-OF-GAINS>                             0<F1>
<DISTRIBUTIONS-OTHER>                                0
<NUMBER-OF-SHARES-SOLD>                            756<F1>
<NUMBER-OF-SHARES-REDEEMED>                     (6859)<F1>
<SHARES-REINVESTED>                                  0<F1>
<NET-CHANGE-IN-ASSETS>                        (338721)
<ACCUMULATED-NII-PRIOR>                           (11)
<ACCUMULATED-GAINS-PRIOR>                      (18060)
<OVERDISTRIB-NII-PRIOR>                              0
<OVERDIST-NET-GAINS-PRIOR>                           0
<GROSS-ADVISORY-FEES>                             1874<F1>
<INTEREST-EXPENSE>                                   0
<GROSS-EXPENSE>                                   4629<F1>
<AVERAGE-NET-ASSETS>                            187353<F1>
<PER-SHARE-NAV-BEGIN>                            13.46<F1>
<PER-SHARE-NII>                                 (0.20)<F1>
<PER-SHARE-GAIN-APPREC>                           1.64<F1>
<PER-SHARE-DIVIDEND>                                 0
<PER-SHARE-DISTRIBUTIONS>                            0<F1>
<RETURNS-OF-CAPITAL>                                 0
<PER-SHARE-NAV-END>                              14.90<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>
WARNING: THE EDGAR SYSTEM ENCOUNTERED ERROR(S) WHILE PROCESSING THIS SCHEDULE.

<TABLE> <S> <C>


<ARTICLE> 6
[NUMBER]023
        <NAME> SELIGMAN HENDERSON GLOBAL SMALLER COS FUND CLASS C
<MULTIPLIER> 1000

<S>                             <C>
<PERIOD-TYPE>                 12-MOS
<FISCAL-YEAR-END>                          OCT-31-1999
<PERIOD-END>                               OCT-31-1999
<INVESTMENTS-AT-COST>                           430960
<INVESTMENTS-AT-VALUE>                          508697
<RECEIVABLES>                                    13415
<ASSETS-OTHER>                                   15869
<OTHER-ITEMS-ASSETS>                                 0
<TOTAL-ASSETS>                                  537981
<PAYABLE-FOR-SECURITIES>                          1699
<SENIOR-LONG-TERM-DEBT>                              0
<OTHER-ITEMS-LIABILITIES>                         4626
<TOTAL-LIABILITIES>                               6325
<SENIOR-EQUITY>                                      0
<PAID-IN-CAPITAL-COMMON>                        456491
<SHARES-COMMON-STOCK>                               24<F1>
<SHARES-COMMON-PRIOR>                                0<F1>
<ACCUMULATED-NII-CURRENT>                         (16)
<OVERDISTRIBUTION-NII>                               0
<ACCUMULATED-NET-GAINS>                         (2292)
<OVERDISTRIBUTION-GAINS>                             0
<ACCUM-APPREC-OR-DEPREC>                         77473
<NET-ASSETS>                                       363<F1>
<DIVIDEND-INCOME>                                    1<F1>
<INTEREST-INCOME>                                    0<F1>
<OTHER-INCOME>                                       0<F1>
<EXPENSES-NET>                                     (2)<F1>
<NET-INVESTMENT-INCOME>                            (1)<F1>
<REALIZED-GAINS-CURRENT>                         27052
<APPREC-INCREASE-CURRENT>                        49234
<NET-CHANGE-FROM-OPS>                            68510
<EQUALIZATION>                                       0
<DISTRIBUTIONS-OF-INCOME>                            0
<DISTRIBUTIONS-OF-GAINS>                             0<F1>
<DISTRIBUTIONS-OTHER>                                0
<NUMBER-OF-SHARES-SOLD>                             24<F1>
<NUMBER-OF-SHARES-REDEEMED>                          0<F1>
<SHARES-REINVESTED>                                  0<F1>
<NET-CHANGE-IN-ASSETS>                        (338721)
<ACCUMULATED-NII-PRIOR>                           (11)
<ACCUMULATED-GAINS-PRIOR>                      (18060)
<OVERDISTRIB-NII-PRIOR>                              0
<OVERDIST-NET-GAINS-PRIOR>                           0
<GROSS-ADVISORY-FEES>                                1<F1>
<INTEREST-EXPENSE>                                   0
<GROSS-EXPENSE>                                      2<F1>
<AVERAGE-NET-ASSETS>                               159<F1>
<PER-SHARE-NAV-BEGIN>                            13.86<F1>
<PER-SHARE-NII>                                 (0.06)<F1>
<PER-SHARE-GAIN-APPREC>                           1.11<F1>
<PER-SHARE-DIVIDEND>                                 0
<PER-SHARE-DISTRIBUTIONS>                            0<F1>
<RETURNS-OF-CAPITAL>                                 0
<PER-SHARE-NAV-END>                              14.91<F1>
<EXPENSE-RATIO>                                   2.47<F1>
[AVG-DEBT-OUTSTANDING]                               0
[AVG-DEBT-PER-SHARE]                                 0
<FN>
<F1>Class C only. All other data are fund level.
</FN>




</TABLE>
WARNING: THE EDGAR SYSTEM ENCOUNTERED ERROR(S) WHILE PROCESSING THIS SCHEDULE.

<TABLE> <S> <C>


<ARTICLE> 6
[NUMBER]024
        <NAME> SELIGMAN HENDERSON GLOBAL SMALLER COS FUND CLASS D
<MULTIPLIER> 1000

<S>                             <C>
<PERIOD-TYPE>                 12-MOS
<FISCAL-YEAR-END>                          OCT-31-1999
<PERIOD-END>                               OCT-31-1999
<INVESTMENTS-AT-COST>                           430960
<INVESTMENTS-AT-VALUE>                          508697
<RECEIVABLES>                                    13415
<ASSETS-OTHER>                                   15869
<OTHER-ITEMS-ASSETS>                                 0
<TOTAL-ASSETS>                                  537981
<PAYABLE-FOR-SECURITIES>                          1699
<SENIOR-LONG-TERM-DEBT>                              0
<OTHER-ITEMS-LIABILITIES>                         4626
<TOTAL-LIABILITIES>                               6325
<SENIOR-EQUITY>                                      0
<PAID-IN-CAPITAL-COMMON>                        456491
<SHARES-COMMON-STOCK>                            10880<F1>
<SHARES-COMMON-PRIOR>                            20273<F1>
<ACCUMULATED-NII-CURRENT>                         (16)
<OVERDISTRIBUTION-NII>                               0
<ACCUMULATED-NET-GAINS>                         (2292)
<OVERDISTRIBUTION-GAINS>                             0
<ACCUM-APPREC-OR-DEPREC>                         77473
<NET-ASSETS>                                    162220<F1>
<DIVIDEND-INCOME>                                 1991<F1>
<INTEREST-INCOME>                                  221<F1>
<OTHER-INCOME>                                    (28)<F1>
<EXPENSES-NET>                                  (5300)<F1>
<NET-INVESTMENT-INCOME>                         (3116)<F1>
<REALIZED-GAINS-CURRENT>                         27052
<APPREC-INCREASE-CURRENT>                        49234
<NET-CHANGE-FROM-OPS>                            68510
<EQUALIZATION>                                       0
<DISTRIBUTIONS-OF-INCOME>                            0
<DISTRIBUTIONS-OF-GAINS>                             0<F1>
<DISTRIBUTIONS-OTHER>                                0
<NUMBER-OF-SHARES-SOLD>                           3573<F1>
<NUMBER-OF-SHARES-REDEEMED>                    (12966)<F1>
<SHARES-REINVESTED>                                  0<F1>
<NET-CHANGE-IN-ASSETS>                        (338721)
<ACCUMULATED-NII-PRIOR>                           (11)
<ACCUMULATED-GAINS-PRIOR>                      (18060)
<OVERDISTRIB-NII-PRIOR>                              0
<OVERDIST-NET-GAINS-PRIOR>                           0
<GROSS-ADVISORY-FEES>                             2144<F1>
<INTEREST-EXPENSE>                                   0
<GROSS-EXPENSE>                                   5300<F1>
<AVERAGE-NET-ASSETS>                            214524<F1>
<PER-SHARE-NAV-BEGIN>                            13.47<F1>
<PER-SHARE-NII>                                 (0.20)<F1>
<PER-SHARE-GAIN-APPREC>                           1.64<F1>
<PER-SHARE-DIVIDEND>                                 0
<PER-SHARE-DISTRIBUTIONS>                            0<F1>
<RETURNS-OF-CAPITAL>                                 0
<PER-SHARE-NAV-END>                              14.91<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>
WARNING: THE EDGAR SYSTEM ENCOUNTERED ERROR(S) WHILE PROCESSING THIS SCHEDULE.

<TABLE> <S> <C>


<ARTICLE> 6
[NUMBER]031
        <NAME> SELIGMAN HENDERSON GLOBAL TECHNOLOGY FUND CLASS A
        <MULTIPLIER> 1000

<S>                             <C>
<PERIOD-TYPE>                 12-MOS
<FISCAL-YEAR-END>                          OCT-31-1999
<PERIOD-END>                               OCT-31-1999
<INVESTMENTS-AT-COST>                           787680
<INVESTMENTS-AT-VALUE>                         1188145
<RECEIVABLES>                                    13827
<ASSETS-OTHER>                                   37852
<OTHER-ITEMS-ASSETS>                                 0
<TOTAL-ASSETS>                                 1239824
<PAYABLE-FOR-SECURITIES>                         14459
<SENIOR-LONG-TERM-DEBT>                              0
<OTHER-ITEMS-LIABILITIES>                         4523
<TOTAL-LIABILITIES>                              18982
<SENIOR-EQUITY>                                      0
<PAID-IN-CAPITAL-COMMON>                        696851
<SHARES-COMMON-STOCK>                            34042<F1>
<SHARES-COMMON-PRIOR>                            38147<F1>
<ACCUMULATED-NII-CURRENT>                         (12)
<OVERDISTRIBUTION-NII>                               0
<ACCUMULATED-NET-GAINS>                         123598
<OVERDISTRIBUTION-GAINS>                             0
<ACCUM-APPREC-OR-DEPREC>                        400405
<NET-ASSETS>                                    795234<F1>
<DIVIDEND-INCOME>                                 2169<F1>
<INTEREST-INCOME>                                  837<F1>
<OTHER-INCOME>                                     192<F1>
<EXPENSES-NET>                                  (9720)<F1>
<NET-INVESTMENT-INCOME>                         (6522)<F1>
<REALIZED-GAINS-CURRENT>                        261563
<APPREC-INCREASE-CURRENT>                       340871
<NET-CHANGE-FROM-OPS>                           590112
<EQUALIZATION>                                       0
<DISTRIBUTIONS-OF-INCOME>                            0<F1>
<DISTRIBUTIONS-OF-GAINS>                        (5914)<F1>
<DISTRIBUTIONS-OTHER>                                0
<NUMBER-OF-SHARES-SOLD>                          40443<F1>
<NUMBER-OF-SHARES-REDEEMED>                    (44963)<F1>
<SHARES-REINVESTED>                                415<F1>
<NET-CHANGE-IN-ASSETS>                          502283
<ACCUMULATED-NII-PRIOR>                            (8)
<ACCUMULATED-GAINS-PRIOR>                            0
<OVERDISTRIB-NII-PRIOR>                              0
<OVERDIST-NET-GAINS-PRIOR>                           0
<GROSS-ADVISORY-FEES>                             6116<F1>
<INTEREST-EXPENSE>                                   0
<GROSS-EXPENSE>                                   9720<F1>
<AVERAGE-NET-ASSETS>                            611570<F1>
<PER-SHARE-NAV-BEGIN>                            12.48<F1>
<PER-SHARE-NII>                                 (0.19)<F1>
<PER-SHARE-GAIN-APPREC>                          11.23<F1>
<PER-SHARE-DIVIDEND>                                 0<F1>
<PER-SHARE-DISTRIBUTIONS>                       (0.16)<F1>
<RETURNS-OF-CAPITAL>                                 0
<PER-SHARE-NAV-END>                              23.36<F1>
<EXPENSE-RATIO>                                   1.59<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
[NUMBER]032
        <NAME> SELIGMAN HENDERSON GLOBAL TECHNOLOGY FUND CLASS B
        <MULTIPLIER> 1000

<S>                             <C>
<PERIOD-TYPE>                 12-MOS
<FISCAL-YEAR-END>                          OCT-31-1999
<PERIOD-END>                               OCT-31-1999
<INVESTMENTS-AT-COST>                           787680
<INVESTMENTS-AT-VALUE>                         1188145
<RECEIVABLES>                                    13827
<ASSETS-OTHER>                                   37852
<OTHER-ITEMS-ASSETS>                                 0
<TOTAL-ASSETS>                                 1239824
<PAYABLE-FOR-SECURITIES>                         14459
<SENIOR-LONG-TERM-DEBT>                              0
<OTHER-ITEMS-LIABILITIES>                         4523
<TOTAL-LIABILITIES>                              18982
<SENIOR-EQUITY>                                      0
<PAID-IN-CAPITAL-COMMON>                        696851
<SHARES-COMMON-STOCK>                             5313<F1>
<SHARES-COMMON-PRIOR>                             4889<F1>
<ACCUMULATED-NII-CURRENT>                         (12)
<OVERDISTRIBUTION-NII>                               0
<ACCUMULATED-NET-GAINS>                         123598
<OVERDISTRIBUTION-GAINS>                             0
<ACCUM-APPREC-OR-DEPREC>                        400405
<NET-ASSETS>                                    118262<F1>
<DIVIDEND-INCOME>                                  290<F1>
<INTEREST-INCOME>                                  112<F1>
<OTHER-INCOME>                                      28<F1>
<EXPENSES-NET>                                  (1936)<F1>
<NET-INVESTMENT-INCOME>                         (1506)<F1>
<REALIZED-GAINS-CURRENT>                        261563
<APPREC-INCREASE-CURRENT>                       340871
<NET-CHANGE-FROM-OPS>                           590112
<EQUALIZATION>                                       0
<DISTRIBUTIONS-OF-INCOME>                            0<F1>
<DISTRIBUTIONS-OF-GAINS>                         (770)<F1>
<DISTRIBUTIONS-OTHER>                                0
<NUMBER-OF-SHARES-SOLD>                           1659<F1>
<NUMBER-OF-SHARES-REDEEMED>                     (1291)<F1>
<SHARES-REINVESTED>                                 56<F1>
<NET-CHANGE-IN-ASSETS>                          502283
<ACCUMULATED-NII-PRIOR>                            (8)
<ACCUMULATED-GAINS-PRIOR>                            0
<OVERDISTRIB-NII-PRIOR>                              0
<OVERDIST-NET-GAINS-PRIOR>                           0
<GROSS-ADVISORY-FEES>                              827<F1>
<INTEREST-EXPENSE>                                   0
<GROSS-EXPENSE>                                   1936<F1>
<AVERAGE-NET-ASSETS>                             82669<F1>
<PER-SHARE-NAV-BEGIN>                            11.98<F1>
<PER-SHARE-NII>                                 (0.31)<F1>
<PER-SHARE-GAIN-APPREC>                          10.75<F1>
<PER-SHARE-DIVIDEND>                                 0<F1>
<PER-SHARE-DISTRIBUTIONS>                       (0.16)<F1>
<RETURNS-OF-CAPITAL>                                 0
<PER-SHARE-NAV-END>                              22.26<F1>
<EXPENSE-RATIO>                                   2.34<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
[NUMBER]033
        <NAME> SELIGMAN HENDERSON GLOBAL TECHNOLOGY FUND CLASS C
        <MULTIPLIER> 1000

<S>                             <C>
<PERIOD-TYPE>                 12-MOS
<FISCAL-YEAR-END>                          OCT-31-1999
<PERIOD-END>                               OCT-31-1999
<INVESTMENTS-AT-COST>                           787680
<INVESTMENTS-AT-VALUE>                         1188145
<RECEIVABLES>                                    13827
<ASSETS-OTHER>                                   37852
<OTHER-ITEMS-ASSETS>                                 0
<TOTAL-ASSETS>                                 1239824
<PAYABLE-FOR-SECURITIES>                         14459
<SENIOR-LONG-TERM-DEBT>                              0
<OTHER-ITEMS-LIABILITIES>                         4523
<TOTAL-LIABILITIES>                              18982
<SENIOR-EQUITY>                                      0
<PAID-IN-CAPITAL-COMMON>                        696851
<SHARES-COMMON-STOCK>                              287<F1>
<SHARES-COMMON-PRIOR>                                0<F1>
<ACCUMULATED-NII-CURRENT>                         (12)
<OVERDISTRIBUTION-NII>                               0
<ACCUMULATED-NET-GAINS>                         123598
<OVERDISTRIBUTION-GAINS>                             0
<ACCUM-APPREC-OR-DEPREC>                        400405
<NET-ASSETS>                                      6377<F1>
<DIVIDEND-INCOME>                                    2<F1>
<INTEREST-INCOME>                                    1<F1>
<OTHER-INCOME>                                       2<F1>
<EXPENSES-NET>                                    (22)<F1>
<NET-INVESTMENT-INCOME>                           (17)<F1>
<REALIZED-GAINS-CURRENT>                        261563
<APPREC-INCREASE-CURRENT>                       340871
<NET-CHANGE-FROM-OPS>                           590112
<EQUALIZATION>                                       0
<DISTRIBUTIONS-OF-INCOME>                            0<F1>
<DISTRIBUTIONS-OF-GAINS>                             0<F1>
<DISTRIBUTIONS-OTHER>                                0
<NUMBER-OF-SHARES-SOLD>                            341<F1>
<NUMBER-OF-SHARES-REDEEMED>                       (54)<F1>
<SHARES-REINVESTED>                                  0<F1>
<NET-CHANGE-IN-ASSETS>                          502283
<ACCUMULATED-NII-PRIOR>                            (8)
<ACCUMULATED-GAINS-PRIOR>                            0
<OVERDISTRIB-NII-PRIOR>                              0
<OVERDIST-NET-GAINS-PRIOR>                           0
<GROSS-ADVISORY-FEES>                               10<F1>
<INTEREST-EXPENSE>                                   0
<GROSS-EXPENSE>                                     22<F1>
<AVERAGE-NET-ASSETS>                              2167<F1>
<PER-SHARE-NAV-BEGIN>                            16.22<F1>
<PER-SHARE-NII>                                 (0.13)<F1>
<PER-SHARE-GAIN-APPREC>                           6.14<F1>
<PER-SHARE-DIVIDEND>                                 0<F1>
<PER-SHARE-DISTRIBUTIONS>                            0<F1>
<RETURNS-OF-CAPITAL>                                 0
<PER-SHARE-NAV-END>                              22.23<F1>
<EXPENSE-RATIO>                                   2.23<F1>
[AVG-DEBT-OUTSTANDING]                               0
[AVG-DEBT-PER-SHARE]                                 0
<FN>
<F1>Class C only. All other data are fund level.
</FN>




</TABLE>
WARNING: THE EDGAR SYSTEM ENCOUNTERED ERROR(S) WHILE PROCESSING THIS SCHEDULE.

<TABLE> <S> <C>


<ARTICLE> 6
[NUMBER]034
        <NAME> SELIGMAN HENDERSON GLOBAL TECHNOLOGY FUND CLASS D
        <MULTIPLIER> 1000

<S>                             <C>
<PERIOD-TYPE>                 12-MOS
<FISCAL-YEAR-END>                          OCT-31-1999
<PERIOD-END>                               OCT-31-1999
<INVESTMENTS-AT-COST>                           787680
<INVESTMENTS-AT-VALUE>                         1188145
<RECEIVABLES>                                    13827
<ASSETS-OTHER>                                   37852
<OTHER-ITEMS-ASSETS>                                 0
<TOTAL-ASSETS>                                 1239824
<PAYABLE-FOR-SECURITIES>                         14459
<SENIOR-LONG-TERM-DEBT>                              0
<OTHER-ITEMS-LIABILITIES>                         4523
<TOTAL-LIABILITIES>                              18982
<SENIOR-EQUITY>                                      0
<PAID-IN-CAPITAL-COMMON>                        696851
<SHARES-COMMON-STOCK>                            13542<F1>
<SHARES-COMMON-PRIOR>                            15383<F1>
<ACCUMULATED-NII-CURRENT>                         (12)
<OVERDISTRIBUTION-NII>                               0
<ACCUMULATED-NET-GAINS>                         123598
<OVERDISTRIBUTION-GAINS>                             0
<ACCUM-APPREC-OR-DEPREC>                        400405
<NET-ASSETS>                                    300969<F1>
<DIVIDEND-INCOME>                                  837<F1>
<INTEREST-INCOME>                                  323<F1>
<OTHER-INCOME>                                      72<F1>
<EXPENSES-NET>                                  (5509)<F1>
<NET-INVESTMENT-INCOME>                         (4277)<F1>
<REALIZED-GAINS-CURRENT>                        261563
<APPREC-INCREASE-CURRENT>                       340871
<NET-CHANGE-FROM-OPS>                           590112
<EQUALIZATION>                                       0
<DISTRIBUTIONS-OF-INCOME>                            0<F1>
<DISTRIBUTIONS-OF-GAINS>                        (2409)<F1>
<DISTRIBUTIONS-OTHER>                                0
<NUMBER-OF-SHARES-SOLD>                           7947<F1>
<NUMBER-OF-SHARES-REDEEMED>                     (9965)<F1>
<SHARES-REINVESTED>                                177<F1>
<NET-CHANGE-IN-ASSETS>                          502283
<ACCUMULATED-NII-PRIOR>                            (8)
<ACCUMULATED-GAINS-PRIOR>                            0
<OVERDISTRIB-NII-PRIOR>                              0
<OVERDIST-NET-GAINS-PRIOR>                           0
<GROSS-ADVISORY-FEES>                             2357<F1>
<INTEREST-EXPENSE>                                   0
<GROSS-EXPENSE>                                   5509<F1>
<AVERAGE-NET-ASSETS>                            235786<F1>
<PER-SHARE-NAV-BEGIN>                            11.96<F1>
<PER-SHARE-NII>                                 (0.31)<F1>
<PER-SHARE-GAIN-APPREC>                          10.74<F1>
<PER-SHARE-DIVIDEND>                            (0.16)<F1>
<PER-SHARE-DISTRIBUTIONS>                            0<F1>
<RETURNS-OF-CAPITAL>                                 0
<PER-SHARE-NAV-END>                              22.23<F1>
<EXPENSE-RATIO>                                   2.34<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
[NUMBER]041
        <NAME> SELIGMAN HENDERSON GLOBAL GROWTH OPPORTUNITIES FUND CLASS A
        <MULTIPLIER> 1000

<S>                             <C>
<PERIOD-TYPE>                   12-MOS
<FISCAL-YEAR-END>                          OCT-31-1999
<PERIOD-END>                               OCT-31-1999
<INVESTMENTS-AT-COST>                           154559
<INVESTMENTS-AT-VALUE>                          223409
<RECEIVABLES>                                     2157
<ASSETS-OTHER>                                   10371
<OTHER-ITEMS-ASSETS>                                 0
<TOTAL-ASSETS>                                  235937
<PAYABLE-FOR-SECURITIES>                            70
<SENIOR-LONG-TERM-DEBT>                              0
<OTHER-ITEMS-LIABILITIES>                          915
<TOTAL-LIABILITIES>                                985
<SENIOR-EQUITY>                                      0
<PAID-IN-CAPITAL-COMMON>                        144598
<SHARES-COMMON-STOCK>                             9403<F1>
<SHARES-COMMON-PRIOR>                            10177<F1>
<ACCUMULATED-NII-CURRENT>                          (5)
<OVERDISTRIBUTION-NII>                               0
<ACCUMULATED-NET-GAINS>                          21586
<OVERDISTRIBUTION-GAINS>                             0
<ACCUM-APPREC-OR-DEPREC>                         68773
<NET-ASSETS>                                    120946<F1>
<DIVIDEND-INCOME>                                 1032<F1>
<INTEREST-INCOME>                                  231<F1>
<OTHER-INCOME>                                    (46)<F1>
<EXPENSES-NET>                                  (1856)<F1>
<NET-INVESTMENT-INCOME>                          (639)<F1>
<REALIZED-GAINS-CURRENT>                         39777
<APPREC-INCREASE-CURRENT>                        21917
<NET-CHANGE-FROM-OPS>                            59703
<EQUALIZATION>                                       0
<DISTRIBUTIONS-OF-INCOME>                            0
<DISTRIBUTIONS-OF-GAINS>                             0<F1>
<DISTRIBUTIONS-OTHER>                                0
<NUMBER-OF-SHARES-SOLD>                          13494<F1>
<NUMBER-OF-SHARES-REDEEMED>                    (14268)<F1>
<SHARES-REINVESTED>                                  0<F1>
<NET-CHANGE-IN-ASSETS>                           50631
<ACCUMULATED-NII-PRIOR>                            (3)
<ACCUMULATED-GAINS-PRIOR>                          387
<OVERDISTRIB-NII-PRIOR>                              0
<OVERDIST-NET-GAINS-PRIOR>                           0
<GROSS-ADVISORY-FEES>                             1098<F1>
<INTEREST-EXPENSE>                                   0
<GROSS-EXPENSE>                                   1856<F1>
<AVERAGE-NET-ASSETS>                            109757<F1>
<PER-SHARE-NAV-BEGIN>                             9.62<F1>
<PER-SHARE-NII>                                 (0.07)<F1>
<PER-SHARE-GAIN-APPREC>                           3.31<F1>
<PER-SHARE-DIVIDEND>                                 0
<PER-SHARE-DISTRIBUTIONS>                            0<F1>
<RETURNS-OF-CAPITAL>                                 0
<PER-SHARE-NAV-END>                              12.86<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
[NUMBER]042
        <NAME> SELIGMAN HENDERSON GLOBAL GROWTH OPPORTUNITIES FUND CLASS B
        <MULTIPLIER> 1000

<S>                             <C>
<PERIOD-TYPE>                   12-MOS
<FISCAL-YEAR-END>                          OCT-31-1999
<PERIOD-END>                               OCT-31-1999
<INVESTMENTS-AT-COST>                           154559
<INVESTMENTS-AT-VALUE>                          223409
<RECEIVABLES>                                     2157
<ASSETS-OTHER>                                   10371
<OTHER-ITEMS-ASSETS>                                 0
<TOTAL-ASSETS>                                  235937
<PAYABLE-FOR-SECURITIES>                            70
<SENIOR-LONG-TERM-DEBT>                              0
<OTHER-ITEMS-LIABILITIES>                          915
<TOTAL-LIABILITIES>                                985
<SENIOR-EQUITY>                                      0
<PAID-IN-CAPITAL-COMMON>                        144598
<SHARES-COMMON-STOCK>                             2834<F1>
<SHARES-COMMON-PRIOR>                             2333<F1>
<ACCUMULATED-NII-CURRENT>                          (5)
<OVERDISTRIBUTION-NII>                               0
<ACCUMULATED-NET-GAINS>                          21586
<OVERDISTRIBUTION-GAINS>                             0
<ACCUM-APPREC-OR-DEPREC>                         68773
<NET-ASSETS>                                     35344<F1>
<DIVIDEND-INCOME>                                  275<F1>
<INTEREST-INCOME>                                   60<F1>
<OTHER-INCOME>                                    (14)<F1>
<EXPENSES-NET>                                   (707)<F1>
<NET-INVESTMENT-INCOME>                          (386)<F1>
<REALIZED-GAINS-CURRENT>                         39777
<APPREC-INCREASE-CURRENT>                        21917
<NET-CHANGE-FROM-OPS>                            59703
<EQUALIZATION>                                       0
<DISTRIBUTIONS-OF-INCOME>                            0
<DISTRIBUTIONS-OF-GAINS>                             0<F1>
<DISTRIBUTIONS-OTHER>                                0
<NUMBER-OF-SHARES-SOLD>                           1144<F1>
<NUMBER-OF-SHARES-REDEEMED>                      (643)<F1>
<SHARES-REINVESTED>                                  0<F1>
<NET-CHANGE-IN-ASSETS>                           50631
<ACCUMULATED-NII-PRIOR>                            (3)
<ACCUMULATED-GAINS-PRIOR>                          387
<OVERDISTRIB-NII-PRIOR>                              0
<OVERDIST-NET-GAINS-PRIOR>                           0
<GROSS-ADVISORY-FEES>                              290<F1>
<INTEREST-EXPENSE>                                   0
<GROSS-EXPENSE>                                    707<F1>
<AVERAGE-NET-ASSETS>                             29009<F1>
<PER-SHARE-NAV-BEGIN>                             9.40<F1>
<PER-SHARE-NII>                                 (0.14)<F1>
<PER-SHARE-GAIN-APPREC>                           3.21<F1>
<PER-SHARE-DIVIDEND>                                 0
<PER-SHARE-DISTRIBUTIONS>                            0<F1>
<RETURNS-OF-CAPITAL>                                 0
<PER-SHARE-NAV-END>                              12.47<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
[NUMBER]043
        <NAME> SELIGMAN HENDERSON GLOBAL GROWTH OPPORTUNITIES FUND CLASS C
        <MULTIPLIER> 1000

<S>                             <C>
<PERIOD-TYPE>                   12-MOS
<FISCAL-YEAR-END>                          OCT-31-1999
<PERIOD-END>                               OCT-31-1999
<INVESTMENTS-AT-COST>                           154559
<INVESTMENTS-AT-VALUE>                          223409
<RECEIVABLES>                                     2157
<ASSETS-OTHER>                                   10371
<OTHER-ITEMS-ASSETS>                                 0
<TOTAL-ASSETS>                                  235937
<PAYABLE-FOR-SECURITIES>                            70
<SENIOR-LONG-TERM-DEBT>                              0
<OTHER-ITEMS-LIABILITIES>                          915
<TOTAL-LIABILITIES>                                985
<SENIOR-EQUITY>                                      0
<PAID-IN-CAPITAL-COMMON>                        144598
<SHARES-COMMON-STOCK>                               84<F1>
<SHARES-COMMON-PRIOR>                                0<F1>
<ACCUMULATED-NII-CURRENT>                          (5)
<OVERDISTRIBUTION-NII>                               0
<ACCUMULATED-NET-GAINS>                          21586
<OVERDISTRIBUTION-GAINS>                             0
<ACCUM-APPREC-OR-DEPREC>                         68773
<NET-ASSETS>                                      1046<F1>
<DIVIDEND-INCOME>                                    1<F1>
<INTEREST-INCOME>                                    0<F1>
<OTHER-INCOME>                                       0<F1>
<EXPENSES-NET>                                     (5)<F1>
<NET-INVESTMENT-INCOME>                            (4)<F1>
<REALIZED-GAINS-CURRENT>                         39777
<APPREC-INCREASE-CURRENT>                        21917
<NET-CHANGE-FROM-OPS>                            59703
<EQUALIZATION>                                       0
<DISTRIBUTIONS-OF-INCOME>                            0
<DISTRIBUTIONS-OF-GAINS>                             0<F1>
<DISTRIBUTIONS-OTHER>                                0
<NUMBER-OF-SHARES-SOLD>                             94<F1>
<NUMBER-OF-SHARES-REDEEMED>                       (10)<F1>
<SHARES-REINVESTED>                                  0<F1>
<NET-CHANGE-IN-ASSETS>                           50631
<ACCUMULATED-NII-PRIOR>                            (3)
<ACCUMULATED-GAINS-PRIOR>                          387
<OVERDISTRIB-NII-PRIOR>                              0
<OVERDIST-NET-GAINS-PRIOR>                           0
<GROSS-ADVISORY-FEES>                                2<F1>
<INTEREST-EXPENSE>                                   0
<GROSS-EXPENSE>                                      5<F1>
<AVERAGE-NET-ASSETS>                               451<F1>
<PER-SHARE-NAV-BEGIN>                            10.99<F1>
<PER-SHARE-NII>                                 (0.07)<F1>
<PER-SHARE-GAIN-APPREC>                           1.55<F1>
<PER-SHARE-DIVIDEND>                                 0
<PER-SHARE-DISTRIBUTIONS>                            0<F1>
<RETURNS-OF-CAPITAL>                                 0
<PER-SHARE-NAV-END>                              12.47<F1>
<EXPENSE-RATIO>                                   2.43<F1>
[AVG-DEBT-OUTSTANDING]                               0
[AVG-DEBT-PER-SHARE]                                 0
<FN>
<F1>Class C only. All other data are fund level.
</FN>




</TABLE>
WARNING: THE EDGAR SYSTEM ENCOUNTERED ERROR(S) WHILE PROCESSING THIS SCHEDULE.

<TABLE> <S> <C>






<ARTICLE> 6
[NUMBER]044
        <NAME> SELIGMAN HENDERSON GLOBAL GROWTH OPPORTUNITIES FUND CLASS D
        <MULTIPLIER> 1000

<S>                             <C>
<PERIOD-TYPE>                   12-MOS
<FISCAL-YEAR-END>                          OCT-31-1999
<PERIOD-END>                               OCT-31-1999
<INVESTMENTS-AT-COST>                           154559
<INVESTMENTS-AT-VALUE>                          223409
<RECEIVABLES>                                     2157
<ASSETS-OTHER>                                   10371
<OTHER-ITEMS-ASSETS>                                 0
<TOTAL-ASSETS>                                  235937
<PAYABLE-FOR-SECURITIES>                            70
<SENIOR-LONG-TERM-DEBT>                              0
<OTHER-ITEMS-LIABILITIES>                          915
<TOTAL-LIABILITIES>                                985
<SENIOR-EQUITY>                                      0
<PAID-IN-CAPITAL-COMMON>                        144598
<SHARES-COMMON-STOCK>                             6223<F1>
<SHARES-COMMON-PRIOR>                             6857<F1>
<ACCUMULATED-NII-CURRENT>                          (5)
<OVERDISTRIBUTION-NII>                               0
<ACCUMULATED-NET-GAINS>                          21586
<OVERDISTRIBUTION-GAINS>                             0
<ACCUM-APPREC-OR-DEPREC>                         68773
<NET-ASSETS>                                     77616<F1>
<DIVIDEND-INCOME>                                  683<F1>
<INTEREST-INCOME>                                  152<F1>
<OTHER-INCOME>                                    (30)<F1>
<EXPENSES-NET>                                  (1767)<F1>
<NET-INVESTMENT-INCOME>                          (962)<F1>
<REALIZED-GAINS-CURRENT>                         39777
<APPREC-INCREASE-CURRENT>                        21917
<NET-CHANGE-FROM-OPS>                            59703
<EQUALIZATION>                                       0
<DISTRIBUTIONS-OF-INCOME>                            0
<DISTRIBUTIONS-OF-GAINS>                             0<F1>
<DISTRIBUTIONS-OTHER>                                0
<NUMBER-OF-SHARES-SOLD>                           2495<F1>
<NUMBER-OF-SHARES-REDEEMED>                     (3129)<F1>
<SHARES-REINVESTED>                                  0<F1>
<NET-CHANGE-IN-ASSETS>                           50631
<ACCUMULATED-NII-PRIOR>                            (3)
<ACCUMULATED-GAINS-PRIOR>                          387
<OVERDISTRIB-NII-PRIOR>                              0
<OVERDIST-NET-GAINS-PRIOR>                           0
<GROSS-ADVISORY-FEES>                              725<F1>
<INTEREST-EXPENSE>                                   0
<GROSS-EXPENSE>                                   1767<F1>
<AVERAGE-NET-ASSETS>                             72560<F1>
<PER-SHARE-NAV-BEGIN>                             9.40<F1>
<PER-SHARE-NII>                                 (0.14)<F1>
<PER-SHARE-GAIN-APPREC>                           3.21<F1>
<PER-SHARE-DIVIDEND>                                 0
<PER-SHARE-DISTRIBUTIONS>                            0<F1>
<RETURNS-OF-CAPITAL>                                 0
<PER-SHARE-NAV-END>                              12.47<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
[NUMBER]051
        <NAME> SELIGMAN HENDERSON EMERGING MARKETS GROWTH FUND CLASS A
<MULTIPLIER> 1000

<S>                             <C>
<PERIOD-TYPE>                 12-MOS
<FISCAL-YEAR-END>                          OCT-31-1999
<PERIOD-END>                               OCT-31-1999
<INVESTMENTS-AT-COST>                            52576
<INVESTMENTS-AT-VALUE>                           58198
<RECEIVABLES>                                      259
<ASSETS-OTHER>                                    2102
<OTHER-ITEMS-ASSETS>                                 0
<TOTAL-ASSETS>                                   60559
<PAYABLE-FOR-SECURITIES>                             0
<SENIOR-LONG-TERM-DEBT>                              0
<OTHER-ITEMS-LIABILITIES>                          446
<TOTAL-LIABILITIES>                                446
<SENIOR-EQUITY>                                      0
<PAID-IN-CAPITAL-COMMON>                         72986
<SHARES-COMMON-STOCK>                             4608<F1>
<SHARES-COMMON-PRIOR>                             4689<F1>
<ACCUMULATED-NII-CURRENT>                          (3)
<OVERDISTRIBUTION-NII>                               0
<ACCUMULATED-NET-GAINS>                        (18428)
<OVERDISTRIBUTION-GAINS>                             0
<ACCUM-APPREC-OR-DEPREC>                          5558
<NET-ASSETS>                                     30822<F1>
<DIVIDEND-INCOME>                                  373<F1>
<INTEREST-INCOME>                                   19<F1>
<OTHER-INCOME>                                   (171)<F1>
<EXPENSES-NET>                                   (694)<F1>
<NET-INVESTMENT-INCOME>                          (473)<F1>
<REALIZED-GAINS-CURRENT>                          4460
<APPREC-INCREASE-CURRENT>                        10446
<NET-CHANGE-FROM-OPS>                            13724
<EQUALIZATION>                                       0
<DISTRIBUTIONS-OF-INCOME>                            0
<DISTRIBUTIONS-OF-GAINS>                             0<F1>
<DISTRIBUTIONS-OTHER>                                0
<NUMBER-OF-SHARES-SOLD>                          17615<F1>
<NUMBER-OF-SHARES-REDEEMED>                    (17696)<F1>
<SHARES-REINVESTED>                                  0<F1>
<NET-CHANGE-IN-ASSETS>                            6120
<ACCUMULATED-NII-PRIOR>                            (2)
<ACCUMULATED-GAINS-PRIOR>                      (22889)
<OVERDISTRIB-NII-PRIOR>                              0
<OVERDIST-NET-GAINS-PRIOR>                           0
<GROSS-ADVISORY-FEES>                              335<F1>
<INTEREST-EXPENSE>                                   0
<GROSS-EXPENSE>                                    694<F1>
<AVERAGE-NET-ASSETS>                             26836<F1>
<PER-SHARE-NAV-BEGIN>                             5.18<F1>
<PER-SHARE-NII>                                 (0.07)<F1>
<PER-SHARE-GAIN-APPREC>                           1.58<F1>
<PER-SHARE-DIVIDEND>                                 0
<PER-SHARE-DISTRIBUTIONS>                            0
<RETURNS-OF-CAPITAL>                                 0
<PER-SHARE-NAV-END>                               6.69<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
[NUMBER]052
        <NAME> SELIGMAN HENDERSON EMERGING MARKETS GROWTH FUND CLASS B
<MULTIPLIER> 1000

<S>                             <C>
<PERIOD-TYPE>                 12-MOS
<FISCAL-YEAR-END>                          OCT-31-1999
<PERIOD-END>                               OCT-31-1999
<INVESTMENTS-AT-COST>                            52576
<INVESTMENTS-AT-VALUE>                           58198
<RECEIVABLES>                                      259
<ASSETS-OTHER>                                    2102
<OTHER-ITEMS-ASSETS>                                 0
<TOTAL-ASSETS>                                   60559
<PAYABLE-FOR-SECURITIES>                             0
<SENIOR-LONG-TERM-DEBT>                              0
<OTHER-ITEMS-LIABILITIES>                          446
<TOTAL-LIABILITIES>                                446
<SENIOR-EQUITY>                                      0
<PAID-IN-CAPITAL-COMMON>                         72986
<SHARES-COMMON-STOCK>                             2475<F1>
<SHARES-COMMON-PRIOR>                             3151<F1>
<ACCUMULATED-NII-CURRENT>                          (3)
<OVERDISTRIBUTION-NII>                               0
<ACCUMULATED-NET-GAINS>                        (18428)
<OVERDISTRIBUTION-GAINS>                             0
<ACCUM-APPREC-OR-DEPREC>                          5558
<NET-ASSETS>                                     16129<F1>
<DIVIDEND-INCOME>                                  227<F1>
<INTEREST-INCOME>                                   13<F1>
<OTHER-INCOME>                                    (90)<F1>
<EXPENSES-NET>                                   (539)<F1>
<NET-INVESTMENT-INCOME>                          (389)<F1>
<REALIZED-GAINS-CURRENT>                          4460
<APPREC-INCREASE-CURRENT>                        10446
<NET-CHANGE-FROM-OPS>                            13724
<EQUALIZATION>                                       0
<DISTRIBUTIONS-OF-INCOME>                            0
<DISTRIBUTIONS-OF-GAINS>                             0<F1>
<DISTRIBUTIONS-OTHER>                                0
<NUMBER-OF-SHARES-SOLD>                            579<F1>
<NUMBER-OF-SHARES-REDEEMED>                     (1255)<F1>
<SHARES-REINVESTED>                                  0<F1>
<NET-CHANGE-IN-ASSETS>                            6120
<ACCUMULATED-NII-PRIOR>                            (2)
<ACCUMULATED-GAINS-PRIOR>                      (22889)
<OVERDISTRIB-NII-PRIOR>                              0
<OVERDIST-NET-GAINS-PRIOR>                           0
<GROSS-ADVISORY-FEES>                              203<F1>
<INTEREST-EXPENSE>                                   0
<GROSS-EXPENSE>                                    539<F1>
<AVERAGE-NET-ASSETS>                             16228<F1>
<PER-SHARE-NAV-BEGIN>                             5.09<F1>
<PER-SHARE-NII>                                 (0.11)<F1>
<PER-SHARE-GAIN-APPREC>                           1.54<F1>
<PER-SHARE-DIVIDEND>                                 0
<PER-SHARE-DISTRIBUTIONS>                            0
<RETURNS-OF-CAPITAL>                                 0
<PER-SHARE-NAV-END>                               6.52<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
[NUMBER]053
        <NAME> SELIGMAN HENDERSON EMERGING MARKETS GROWTH FUND CLASS C
<MULTIPLIER> 1000

<S>                             <C>
<PERIOD-TYPE>                 12-MOS
<FISCAL-YEAR-END>                          OCT-31-1999
<PERIOD-END>                               OCT-31-1999
<INVESTMENTS-AT-COST>                            52576
<INVESTMENTS-AT-VALUE>                           58198
<RECEIVABLES>                                      259
<ASSETS-OTHER>                                    2102
<OTHER-ITEMS-ASSETS>                                 0
<TOTAL-ASSETS>                                   60559
<PAYABLE-FOR-SECURITIES>                             0
<SENIOR-LONG-TERM-DEBT>                              0
<OTHER-ITEMS-LIABILITIES>                          446
<TOTAL-LIABILITIES>                                446
<SENIOR-EQUITY>                                      0
<PAID-IN-CAPITAL-COMMON>                         72986
<SHARES-COMMON-STOCK>                               47<F1>
<SHARES-COMMON-PRIOR>                                0<F1>
<ACCUMULATED-NII-CURRENT>                          (3)
<OVERDISTRIBUTION-NII>                               0
<ACCUMULATED-NET-GAINS>                        (18428)
<OVERDISTRIBUTION-GAINS>                             0
<ACCUM-APPREC-OR-DEPREC>                          5558
<NET-ASSETS>                                       307<F1>
<DIVIDEND-INCOME>                                    0<F1>
<INTEREST-INCOME>                                    0<F1>
<OTHER-INCOME>                                     (2)<F1>
<EXPENSES-NET>                                     (2)<F1>
<NET-INVESTMENT-INCOME>                            (4)<F1>
<REALIZED-GAINS-CURRENT>                          4460
<APPREC-INCREASE-CURRENT>                        10446
<NET-CHANGE-FROM-OPS>                            13724
<EQUALIZATION>                                       0
<DISTRIBUTIONS-OF-INCOME>                            0
<DISTRIBUTIONS-OF-GAINS>                             0<F1>
<DISTRIBUTIONS-OTHER>                                0
<NUMBER-OF-SHARES-SOLD>                             50<F1>
<NUMBER-OF-SHARES-REDEEMED>                        (3)<F1>
<SHARES-REINVESTED>                                  0<F1>
<NET-CHANGE-IN-ASSETS>                            6120
<ACCUMULATED-NII-PRIOR>                            (2)
<ACCUMULATED-GAINS-PRIOR>                      (22889)
<OVERDISTRIB-NII-PRIOR>                              0
<OVERDIST-NET-GAINS-PRIOR>                           0
<GROSS-ADVISORY-FEES>                                1<F1>
<INTEREST-EXPENSE>                                   0
<GROSS-EXPENSE>                                      2<F1>
<AVERAGE-NET-ASSETS>                               164<F1>
<PER-SHARE-NAV-BEGIN>                             6.14<F1>
<PER-SHARE-NII>                                 (0.07)<F1>
<PER-SHARE-GAIN-APPREC>                           0.45<F1>
<PER-SHARE-DIVIDEND>                                 0
<PER-SHARE-DISTRIBUTIONS>                            0
<RETURNS-OF-CAPITAL>                                 0
<PER-SHARE-NAV-END>                               6.52<F1>
<EXPENSE-RATIO>                                   3.37<F1>
[AVG-DEBT-OUTSTANDING]                               0
[AVG-DEBT-PER-SHARE]                                 0
<FN>
<F1>Class C only. All other data are fund level.
</FN>




</TABLE>
WARNING: THE EDGAR SYSTEM ENCOUNTERED ERROR(S) WHILE PROCESSING THIS SCHEDULE.

<TABLE> <S> <C>


<ARTICLE> 6
[NUMBER]054
        <NAME> SELIGMAN HENDERSON EMERGING MARKETS GROWTH FUND CLASS D
<MULTIPLIER> 1000

<S>                             <C>
<PERIOD-TYPE>                 12-MOS
<FISCAL-YEAR-END>                          OCT-31-1999
<PERIOD-END>                               OCT-31-1999
<INVESTMENTS-AT-COST>                            52576
<INVESTMENTS-AT-VALUE>                           58198
<RECEIVABLES>                                      259
<ASSETS-OTHER>                                    2102
<OTHER-ITEMS-ASSETS>                                 0
<TOTAL-ASSETS>                                   60559
<PAYABLE-FOR-SECURITIES>                             0
<SENIOR-LONG-TERM-DEBT>                              0
<OTHER-ITEMS-LIABILITIES>                          446
<TOTAL-LIABILITIES>                                446
<SENIOR-EQUITY>                                      0
<PAID-IN-CAPITAL-COMMON>                         72986
<SHARES-COMMON-STOCK>                             1970<F1>
<SHARES-COMMON-PRIOR>                             2683<F1>
<ACCUMULATED-NII-CURRENT>                          (3)
<OVERDISTRIBUTION-NII>                               0
<ACCUMULATED-NET-GAINS>                        (18428)
<OVERDISTRIBUTION-GAINS>                             0
<ACCUM-APPREC-OR-DEPREC>                          5558
<NET-ASSETS>                                     12855<F1>
<DIVIDEND-INCOME>                                  188<F1>
<INTEREST-INCOME>                                   11<F1>
<OTHER-INCOME>                                    (71)<F1>
<EXPENSES-NET>                                   (444)<F1>
<NET-INVESTMENT-INCOME>                          (316)<F1>
<REALIZED-GAINS-CURRENT>                          4460
<APPREC-INCREASE-CURRENT>                        10446
<NET-CHANGE-FROM-OPS>                            13724
<EQUALIZATION>                                       0
<DISTRIBUTIONS-OF-INCOME>                            0
<DISTRIBUTIONS-OF-GAINS>                             0<F1>
<DISTRIBUTIONS-OTHER>                                0
<NUMBER-OF-SHARES-SOLD>                           1224<F1>
<NUMBER-OF-SHARES-REDEEMED>                     (1937)<F1>
<SHARES-REINVESTED>                                  0<F1>
<NET-CHANGE-IN-ASSETS>                            6120
<ACCUMULATED-NII-PRIOR>                            (2)
<ACCUMULATED-GAINS-PRIOR>                      (22889)
<OVERDISTRIB-NII-PRIOR>                              0
<OVERDIST-NET-GAINS-PRIOR>                           0
<GROSS-ADVISORY-FEES>                              167<F1>
<INTEREST-EXPENSE>                                   0
<GROSS-EXPENSE>                                    444<F1>
<AVERAGE-NET-ASSETS>                             13349<F1>
<PER-SHARE-NAV-BEGIN>                             5.09<F1>
<PER-SHARE-NII>                                 (0.11)<F1>
<PER-SHARE-GAIN-APPREC>                           1.54<F1>
<PER-SHARE-DIVIDEND>                                 0
<PER-SHARE-DISTRIBUTIONS>                            0
<RETURNS-OF-CAPITAL>                                 0
<PER-SHARE-NAV-END>                               6.52<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>


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