SELIGMAN PORTFOLIOS INC/NY
485BPOS, 1998-06-01
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                                                               File No. 33-15253

                                                                        811-5221
                       SECURITIES AND EXCHANGE COMMISSION
                             Washington, D.C. 20549

                                    FORM N-1A

REGISTRATION STATEMENT UNDER THE SECURITIES ACT OF 1933                     |X|
         Pre-Effective Amendment No.                                        |_|
                                      -----

   

         Post-Effective Amendment No.   23                                  |X|
                                       ---


REGISTRATION STATEMENT UNDER THE INVESTMENT COMPANY ACT OF 1940             |X|


         Amendment No.  25                                                  |X|

    
- - ------------------------------------------------------------------------------
                            SELIGMAN PORTFOLIOS, INC.
               (Exact name of registrant as specified in charter)
- - ------------------------------------------------------------------------------


                    100 PARK AVENUE, NEW YORK, NEW YORK 10017
                    (Address of principal executive offices)

     Registrant's Telephone Number: 212-850-1864 or Toll Free: 800-221-2450
- - ------------------------------------------------------------------------------

      THOMAS G. ROSE, Treasurer, 100 Park Avenue, New York, New York 10017
                     (Name and address of agent for service)

- - ------------------------------------------------------------------------------

It is proposed that this filing will become effective (check appropriate box):
   

|X|  immediately upon filing pursuant to paragraph (b)


|_|  on (date) pursuant to paragraph (b)

    
|_|  60 days after filing pursuant to paragraph (a)(1)

|_|  on (date) pursuant to paragraph (a)(1)

|_|  75 days after filing pursuant to paragraph (a)(2)

|_|  on (date) pursuant to paragraph (a)(2) of rule 485.


If appropriate, check the following box:

|_|  This  post-effective  amendment  designates  a  new  effective  date  for a
     previously filed post-effective amendment.


Registrant  has  registered  an  indefinite   amount  of  securities  under  the
Securities Act of 1933 pursuant to Rule  24f-2(a)(1) and a Rule 24f-2 Notice for
Registrant's  most  recent  fiscal year which was filed with the  Commission  on
March 27, 1998.



<PAGE>

   

                         POST-EFFECTIVE AMENDMENT NO. 23
                              CROSS REFERENCE SHEET
                             Pursuant to Rule 481(a)
    

<TABLE>
<CAPTION>

ITEM NO. IN PART A OF FORM N-1A                      LOCATION IN PROSPECTUS
- - -------------------------------                      ----------------------

<C>                                                  <C>
1.   Cover Page                                      Cover Page

2.   Synopsis                                        Not applicable

3.   Condensed Financial Information                 Financial Highlights

4.   General Description of Registrant               Investment Objectives and Policies

5.   Management of Fund                              Management Services; Portfolio Transactions,
                                                     Portfolio Turnover and Valuation

5a.  Manager's Discussion of Fund Performance        Management Services

6.   Capital Stock and Other Securities              Organization and Capitalization; Other Investment
                                                     Policies; Dividends, Distributions and Taxes

7.   Purchase of Securities Being Offered            Purchases and Redemptions

8.   Redemption or Repurchase                        Purchases and Redemptions

9.   Pending Legal Proceedings                       Not applicable


ITEM NO. IN PART B OF FORM N-1A                      LOCATION IN STATEMENT OF ADDITIONAL INFORMATION
- - -------------------------------                      -----------------------------------------------

10.  Cover Page                                      Cover Page

11.  Table of Contents                               Table of Contents

12.  General Information and History                 Appendix A

13.  Investment Objectives and Policies              Investment Policies and Restrictions

14.  Management of the Registrant                    Management and Expenses

15.  Control Persons and Principal                   Directors and Officers
     Holders of Services

16.  Investment Advisory and Other                   Management and Expenses;
     Services                                        Custodians and Independent Auditors

17.  Brokerage Allocation                            Portfolio Transactions, Valuation and Redemption

18.  Capital Stock and Other Securities              Portfolio Transactions, Valuation and Redemption

19.  Purchase, Redemption and Pricing of             Portfolio Transactions, Valuation and
     Securities Being Offered                        Redemption

20.  Tax Status                                      Dividends, Distributions and Taxes (Prospectus)

21.  Underwriters                                    Not applicable

22.  Calculation of Performance Data                 Portfolio Transactions, Valuation and Redemption

23.  Financial Statements                            Financial Statements
</TABLE>


<PAGE>
   

                 Parts A and B are Incorporated by Reference to
            Post-Effective Amendment No. 22 filed on April 28, 1998.
    
<PAGE>

PART C.  OTHER INFORMATION

ITEM 24.       FINANCIAL STATEMENTS AND EXHIBITS

   (a)  Financial Statements:

   Part A:  Financial Highlights from June 21, 1988 (commencement of operations)
            to December 31, 1997 for Seligman Bond Portfolio,  Seligman  Capital
            Portfolio, Seligman Cash Management Portfolio, Seligman Common Stock
            Portfolio,   and  Seligman  Income  Portfolio;   from  May  3,  1993
            (commencement  of  operations) to December 31, 1997 for the Seligman
            Henderson   International   Portfolio;   from   October   11,   1994
            (commencement  of  operations)  to December  31,  1997 for  Seligman
            Communications   and  Information   Portfolio,   Seligman   Frontier
            Portfolio and Seligman Henderson Global Smaller Companies Portfolio;
            from May 1, 1995  (commencement  of operations) to December 31, 1997
            for  Seligman  High-Yield  Bond  Portfolio;  and  from  May 1,  1996
            (commencement  of  operations)  to December  31,  1997 for  Seligman
            Henderson  Global  Growth   Opportunities   Portfolio  and  Seligman
            Henderson Global Technology Portfolio.

   Part B:  Required Financial Statements, which are included in the Fund's 1997
            Annual Report, are incorporated by reference in the Fund's Statement
            of  Additional   Information.   These   Financial   Statements  are:
            Portfolios  of  Investments  as of December 31, 1997;  Statements of
            Assets and  Liabilities  as of  December  31,  1997;  Statements  of
            Operations  for the year ended  December  31,  1997;  Statements  of
            Changes in Net Assets for the years ended December 31, 1997 and 1996
            for Seligman Bond Portfolio,  Seligman Capital  Portfolio,  Seligman
            Cash Management Portfolio, Seligman Common Stock Portfolio, Seligman
            Communications   and  Information   Portfolio,   Seligman   Frontier
            Portfolio,  Seligman  Henderson Global Smaller Companies  Portfolio,
            Seligman Henderson International Portfolio, Seligman High-Yield Bond
            Portfolio,  and Seligman  Income  Portfolio;  and for the year ended
            December  31,  1997 and the  period  May 1,  1996  (commencement  of
            operations) to December 31, 1996 for the Seligman  Henderson  Global
            Growth   Opportunities   Portfolio  and  Seligman  Henderson  Global
            Technology  Portfolio;  Notes  to  Financial  Statements;  Financial
            Highlights  for the five years ended  December 31, 1997 for Seligman
            Bond Portfolio, Seligman Capital Portfolio, Seligman Cash Management
            Portfolio,  Seligman  Common Stock  Portfolio,  and Seligman  Income
            Portfolio;  for the period May 3, 1993  (commencement of operations)
            to December 31, 1997 for Seligman Henderson International Portfolio;
            for the period  October 11, 1994  (commencement  of  operations)  to
            December  31,  1997  for  Seligman  Communications  and  Information
            Portfolio, Seligman Frontier Portfolio and Seligman Henderson Global
            Smaller   Companies   Portfolio;   for  the   period   May  1,  1995
            (commencement  of  operations)  to December  31,  1997 for  Seligman
            High-Yield  Bond   Portfolio;   and  for  the  period  May  1,  1996
            (commencement  of  operations)  to December  31,  1997 for  Seligman
            Henderson  Global  Growth   Opportunities   Portfolio  and  Seligman
            Henderson  Global  Technology   Portfolio;   Report  of  Independent
            Auditors.

     (b)  Exhibits:  All Exhibits have been  previously  filed,  except Exhibits
          marked with an asterisk (*) which are incorporated herein.

   
     (1)  Form  of  Articles  of  Amendment  and   Restatement  of  Articles  of
          Incorporation. (Incorporated by reference to Post-Effective Amendment
          No. 22 filed on April 28, 1998.)
    

     (2)  By-laws of Registrant.  (Incorporated  by reference to  Post-Effective
          Amendment No. 20 filed on April 17, 1997.)

     (3)  Not applicable.

     (4)  Not applicable.

<PAGE>


PART C.  OTHER INFORMATION (CONT'D)



   (5)    (a)  Form of  Management  Agreement  in respect of Seligman  Henderson
               Global  Growth  Opportunities  Portfolio  and Seligman  Henderson
               Global  Technology  Portfolio.   (Incorporated  by  reference  to
               Post-Effective No. 17 filed on February 15, 1996.)

   
          (b)  Subadvisory  Agreement  in respect of Seligman  Henderson  Global
               Growth  Opportunities  Portfolio  and Seligman  Henderson  Global
               Technology Portfolio.  (Incorporated by reference to
               Post-Effective Amendment No. 22 filed on April 28, 1998.)
    

          (c)  Form of  Management  Agreement in respect of Seligman  High-Yield
               Bond  Portfolio.  (Incorporated  by reference  to  Post-Effective
               Amendment No. 14 filed on February 14, 1995.)

          (d)  Management  Agreement in respect of Seligman  Communications  and
               Information and Seligman  Frontier  Portfolios.  (Incorporated by
               reference to  Post-Effective  Amendment No. 15 filed on March 31,
               1995.)

          (e)  Management  Agreement  in respect of  Seligman  Henderson  Global
               Smaller Companies Portfolio (formerly,  Seligman Henderson Global
               Emerging  Companies  Portfolio).  (Incorporated  by  reference to
               Post-Effective Amendment No. 15 filed on March 31, 1995.)

   
          (f)  Subadvisory  Agreement  in respect of Seligman  Henderson  Global
               Smaller Companies Portfolio.  (Incorporated by reference to
               Post-Effective Amendment No. 22 filed on April 28, 1998.)
    

          (g)  Management   Agreement   in   respect   of   Seligman   Henderson
               International   Portfolio.    (Incorporated   by   reference   to
               Post-Effective Amendment No. 15 filed on March 31, 1995.)

   
          (h)  Subadvisory  Agreement  in respect of Seligman  Henderson  Global
               Growth  Opportunities  Portfolio  and Seligman  Henderson  Global
               Technology Portfolio.  (Incorporated by reference to
               Post-Effective Amendment No. 22 filed on April 28, 1998.)
    

          (i)  Management  Agreement  in respect of Seligman  Capital,  Seligman
               Cash Management, Seligman Common Stock, Seligman Bond Securities,
               and Seligman  Income  Portfolios.  (Incorporated  by reference to
               Post-Effective Amendment No. 15 filed on March 31, 1995.)

   
          (j)  Management  Agreement  in respect  of  Seligman  Large-Cap  Value
               Portfolio and Seligman Small-Cap Value Portfolio. (Incorporated
               by reference to Post-Effective Amendment No. 22 filed on
               April 28, 1998.)
    


   (6)   Not applicable.


   
   (7)   Deferred Compensation Plan for Directors of Seligman Portfolios, Inc.
         (Incorporated by reference to Post-Effective Amendment No. 22 filed on
         April 28, 1998.)
   

   (8)    (a)  Form of  Custodian  Agreement  in  respect of  Seligman  Capital,
               Seligman Cash  Management,  Seligman Common Stock,  Seligman Bond
               Securities, and Seligman Income Portfolios.  (Incorporated by
               reference to Post-Effective Amendment No. 22 filed on
               April 28, 1998.)

          (b)  Form of First  Amendment  to  Custodian  Agreement  in respect of
               Seligman  Communications  and Information  and Seligman  Frontier
               Portfolios.(Incorporated by reference to Post-Effective Amendment
               No. 22 filed on April 28, 1998.)


          (c)  Form of Recordkeeping  Agreement in respect of Seligman Henderson
               International Portfolio.  (Incorporated by reference to
               Post-Effective Amendment No. 22 filed on April 28, 1998.)

          (d)  Form of First Amendment to Recordkeeping  Agreement in respect of
               Seligman Henderson Global Smaller Companies Portfolio.
               (Incorporated by reference to Post-Effective Amendment No. 22
               filed on April 28, 1998.)
    
          (e)  Second  Amendment to  Custodian  Agreement in respect of Seligman
               High-Yield   Bond  Portfolio.   (Incorporated   by  reference  to
               Post-Effective Amendment No. 18 filed on May 2, 1996.)

          (f)  Second  Amendment  to  Recordkeeping   Agreement  in  respect  of
               Seligman  Henderson  Global  Growth  Opportunities  Portfolio and
               Seligman Henderson Global Technology Portfolio.  (Incorporated by
               reference to Post-Effective Amendment No. 18, filed May 2, 1996.)

          (g)  Custodian  Agreement between  Registrant and Morgan Stanley Trust
               Company  in  respect  of  the  Seligman   Henderson   Portfolios.
               (Incorporated  by reference to  Post-Effective  Amendment  No. 19
               filed on November 1, 1996.)




<PAGE>

PART C.  OTHER INFORMATION (CONT'D)

(9)   Other Material Contracts.


          (a)  Buy-Sell  Agreement and  Modification  between the Registrant and
               The Mutual  Benefit  Life  Insurance  Company.  (Incorporated  by
               reference to  Post-Effective  Amendment No. 10 filed on April 26,
               1993.)
   
          (b)  Form of Buy/Sell  Agreement  between  Registrant  and Canada Life
               Insurance Company of America. (Incorporated by reference to
               Post-Effective Amendment No. 22 filed on April 28, 1998.)

          (c)  Form of Buy/Sell  Agreement  between  Registrant  and Canada Life
               Insurance Company of New York.  (Incorporated by reference to
               Post-Effective Amendment No. 22 filed on April 28, 1998.)

          (d)  Agency  Agreement  between  Investors  Fiduciary  Trust  Company,
               acting as Transfer and Dividend Disbursing Agent, and the Fund in
               respect of Seligman Capital,  Seligman Cash Management,  Seligman
               Common  Stock,  Seligman  Bond  Securities,  and Seligman  Income
               Portfolios.(Incorporated by reference to Post-Effective Amendment
               No. 22 filed on April 28, 1998.)

          (e)  First Amendment to Agency Agreement between  Investors  Fiduciary
               Trust Company,  acting as Transfer and Dividend Disbursing Agent,
               and the  Fund in  respect  of  Seligman  Henderson  International
               Portfolio. (Incorporated by reference to Post-Effective Amendment
               No. 22 filed on April 28, 1998.)

          (f)  Second Amendment to Agency Agreement between Investors  Fiduciary
               Trust Company,  acting as Transfer and Dividend Disbursing Agent,
               and  the  Fund  in  respect  of   Seligman   Communications   and
               Information,  Seligman  Frontier,  and Seligman  Henderson Global
               Smaller  Companies  Portfolios.  (Incorporated  by  reference  to
               Post-Effective Amendment No. 22 filed on April 28, 1998.)
    
          (g)  Third Amendment to Agency Agreement between  Investors  Fiduciary
               Trust Company,  acting as Transfer and Dividend Disbursing Agent,
               and the Fund in respect of Seligman  High-Yield  Bond  Portfolio.
               (Incorporated  by reference to  Post-Effective  Amendment No. 18,
               filed May 2, 1996.)

          (h)  Fourth Amendment to Agency Agreement between Investors  Fiduciary
               Trust Company,  acting as Transfer and Dividend Disbursing Agent,
               and the Fund in  respect  of  Seligman  Henderson  Global  Growth
               Opportunities  Portfolio and Seligman Henderson Global Technology
               Portfolio. (Incorporated by reference to Post-Effective Amendment
               No. 18, filed May 2, 1996.)

   
          (i)  Form of Promotional Agent Distribution Agreement between Seligman
               Financial Services,  Inc. on behalf of Registrant and Canada Life
               Insurance Company of America.  (Incorporated by reference to
               Post-Effective Amendment No. 22 filed on April 28, 1998.)

          (j)  Form of Promotional Agent Distribution Agreement between Seligman
               Financial Services,  Inc. on behalf of Registrant and Canada Life
               Insurance Company of New York. (Incorporated by reference to
               Post-Effective Amendment No. 22 filed on April 28, 1998.)

          (k)  Form of Selling  Agreement between Seligman  Financial  Services,
               Inc. on behalf of Registrant and Canada Life Insurance Company of
               America.  (Incorporated by reference to Post-Effective Amendment
               No. 22 filed on April 28, 1998.)

          (l)  Form of Selling  Agreement between Seligman  Financial  Services,
               Inc. on behalf of Registrant and Canada Life Insurance Company of
               New York. (Incorporated by reference to Post-Effective Amendment
               No. 22 filed on April 28, 1998.)


   (10)   Opinion and Consent of Counsel.*
    

   (11)   Consent of independent auditors.  (Incorporated by reference to
          Post-Effective Amendment No. 22 filed on April 28, 1998.)

   (12)   N/A

   
  (13)    (a)  Form of Purchase  Agreement for Seligman  Capital, Seligman Cash
               Management,  Seligman Common Stock, Seligman Bond Securities, and
               Seligman Income Portfolios. (Incorporated by reference to
               Post-Effective Amendment No. 22 filed on April 28, 1998.)

          (b)  Investment   Letter   for   Seligman   Henderson    International
               Portfolio.  (Incorporated by reference to Post-Effective
               Amendment No. 22 filed on April 28, 1998.)
    
          (c)  Investment   Letter  for  Seligman   High-Yield  Bond  Portfolio.
               (Incorporated  by reference to  Post-Effective  Amendment  No. 15
               filed on March 31, 1995.)

          (d)  Investment   Letter  for   Seligman   Henderson   Global   Growth
               Opportunities  Portfolio and Seligman Henderson Global Technology
               Portfolio. (Incorporated by reference to Post-Effective Amendment
               No. 18, filed May 2, 1996.)

<PAGE>


PART C.  OTHER INFORMATION (CONT'D)


      (14)  The Seligman  Roth/Traditional IRA Information Kit. (Incorporated by
            reference to Exhibit q(1) of Registration  Statement No.  333-50295,
            Form N-2, filed on April 16, 1998.)


      (14a) The Seligman Simple IRA Plan Set-Up Kit.  (Incorporated by reference
            to Exhibit 14 of Registration Statement No. 333-20621, Pre-Effective
            Amendment No. 2, filed on April 17, 1997.)

      (14b) The Seligman Simple IRA Plan Agreement.  (Incorporated  by reference
            to Exhibit 14 of Registration Statement No. 333-20621, Pre-Effective
            Amendment No. 2, filed on April 17, 1997.)


      (14c) Qualified  Plan and Trust  Basic  Plan  Document.  (Incorporated  by
            reference to Exhibit q(4) to Registration No.  333-50295,  Form N-2,
            filed on April 16, 1998.)

      (14d) Flexible Standardized 401(k) Profit Sharing Plan Adoption Agreement.
            (Incorporated  by  reference  to Exhibit  q(4) to  Registration  No.
            333-50295, Form N-2, filed on April 16, 1998.)

      (14e) Flexible  Nonstandardized  Safe Harbor  401(k)  Profit  Sharing Plan
            Adoption  Agreement.  (Incorporated  by reference to Exhibit q(4) to
            Registration No. 333-50295, Form N-2, filed on April 16, 1998.)
   

      (14f) Simplified  Employee  Pension  Plan.  (Incorporated  by reference to
            Exhibit 14(f) to Registration No. 2-10835,  Post-Effective Amendment
            No. 76, filed on April 29, 1998.)

      (14g) Educational  IRA.  (Incorporated  by reference  to Exhibit  14(f) to
            Registration No. 2-10835,  Post-Effective Amendment No. 76, filed on
            April 29, 1998.)
    
      (15)  Not applicable.

      (16)  Not applicable.


   
      (17)  Financial Data Schedules  meeting the requirements of Rule 483 under
            the Securities Act of 1933.  (Incorporated by reference to Post-
            Effective Amendment No. 22 filed on April 28, 1998.)
    

      (18)  Not applicable.


   
      Other Exhibits: Power of Attorney for Richard R. Schmaltz.  (Incorporated
                      by reference to Post-Effective Amendment No. 22 filed on
                      April 28, 1998.)
    

                  Powers   of   Attorney    (Incorporated    by   reference   to
                  Post-Effective Amendment No. 20 filed on April 17, 1997.)


ITEM 25.   PERSONS CONTROLLED BY OR UNDER COMMON CONTROL WITH REGISTRANT

           None.

ITEM 26.   NUMBER OF HOLDERS OF SECURITIES


   
           As of May 29, 1998,  there were eight record holders of Capital Stock
           of the Registrant.
    


ITEM 27.   INDEMNIFICATION


   
           Reference  is  made  to  the   provisions  of  Article   Eleventh  of
           Registrant's  Amended and Restated Articles of Incorporation filed as
           Exhibit 24(b)(1) of Registrant's  Post-Effective  Amendment No. 22 to
           the Registration Statement and Article IV of Registrant's Amended and
           Restated   By-laws   filed  as  Exhibit   24(b)(2)  to   Registrant's
           Post-Effective Amendment No. 20 to the Registration Statement.
    




<PAGE>



PART C.     OTHER INFORMATION (CONT'D)

            Insofar  as  indemnification   for  liabilities  arising  under  the
            Securities  Act of 1933 may be permitted to directors,  officers and
            controlling  persons of the  registrant  pursuant  to the  foregoing
            provisions,  or otherwise,  the  registrant  has been advised by the
            Securities and Exchange  Commission such  indemnification is against
            public   policy  as  expressed   in  the  Act  and  is,   therefore,
            unenforceable. In the event that a claim for indemnification against
            such  liabilities  (other  than the  payment  by the  registrant  of
            expenses  incurred  or paid by a  director,  officer or  controlling
            person of the  registrant in the  successful  defense of any action,
            suit or  proceeding)  is  asserted  by  such  director,  officer  or
            controlling   person  in  connection   with  the  securities   being
            registered,  the  registrant  will,  unless  in the  opinion  of its
            counsel the matter has been settled by controlling precedent, submit
            to a court of  appropriate  jurisdiction  the question  whether such
            indemnification  by it is against  public policy as expressed in the
            Act and will be governed by the final adjudication of such issue.

ITEM 28.  BUSINESS AND OTHER CONNECTIONS OF INVESTMENT ADVISER

          J.  &  W.  Seligman  &  Co.   Incorporated,   a  Delaware  Corporation
          ("Manager"),  is the Registrant's investment manager. The Manager also
          serves as investment manager to seventeen other associated  investment
          companies.  They  are  Seligman  Capital  Fund,  Inc.,  Seligman  Cash
          Management  Fund,  Inc.,  Seligman Common Stock Fund,  Inc.,  Seligman
          Communications  and Information  Fund, Inc.,  Seligman  Frontier Fund,
          Inc.,  Seligman  Growth Fund,  Inc.,  Seligman  Henderson  Global Fund
          Series, Inc., Seligman High Income Fund Series,  Seligman Income Fund,
          Inc., Seligman Municipal Fund Series,  Inc., Seligman Municipal Series
          Trust, Seligman New Jersey Municipal Fund, Inc., Seligman Pennsylvania
          Municipal Fund Series, Seligman Quality Municipal Fund, Inc., Seligman
          Select  Municipal Fund,  Inc.,  Seligman Value Fund Series,  Inc., and
          Tri-Continental Corporation.

          Seligman Henderson Co. (the "Subadviser")  serves as subadviser to the
          Registrant and Seligman Henderson Global Fund Series, Inc.


          The Manager and Subadviser  each have an investment  advisory  service
          division  which  provides  investment  management or advice to private
          clients.  The list  required by this Item 28 of officers and directors
          of  the  Manager  and  the  Subadviser,  respectively,  together  with
          information  as  to  any  other  business,  profession,   vocation  or
          employment  of a  substantial  nature  engaged in by such officers and
          directors  during the past two years,  is incorporated by reference to
          Schedules  A  and  D of  Form  ADV,  filed  by  the  Manager  and  the
          Subadviser,  respectively,  pursuant to the Investment Advisers Act of
          1940 (SEC File Nos. 801-15798 and 801-40670, respectively), which were
          filed on March 31, 1998.


ITEM 29.  Not applicable.

ITEM      30.  Location of Accounts and Records - All accounts,  books and other
          documents  required to be  maintained by Section 31(a) of the 1940 Act
          and the Rules (17 CFR 270.31a-1 to 31a-3) promulgated  thereunder will
          be maintained by the following:


          Custodian for Seligman Bond  Portfolio,  Seligman  Capital  Portfolio,
          Seligman Cash Management  Portfolio,  Seligman Common Stock Portfolio,
          Seligman  Communications and Information Portfolio,  Seligman Frontier
          Portfolio,  Seligman  High-Yield Bond  Portfolio,  and Seligman Income
          Portfolio  and  Recordkeeping  agent  for  all  Portfolios:  Investors
          Fiduciary  Trust  Company,  801  Pennsylvania,  Kansas City,  Missouri
          64105.

<PAGE>
PART C.   OTHER INFORMATION (CONT'D)

          Custodian  for  Seligman   Henderson   Global   Growth   Opportunities
          Portfolio,  Seligman  Henderson  Global Smaller  Companies  Portfolio,
          Seligman Henderson Global Technology Portfolio, and Seligman Henderson
          International Portfolio:  Morgan Stanley Trust Company, One Pierrepont
          Plaza, Brooklyn, New York 11201.


          Transfer,  Redemption and Other  Shareholder  Account Services for all
          Portfolios:  Investors  Fiduciary  Trust  Company,  801  Pennsylvania,
          Kansas City, Missouri 64105.


ITEM      31.  Management  Services - None not  discussed in the  Prospectus  or
          Statement of Additional Information for the Registrant.

ITEM 32.  UNDERTAKINGS -

     (1)  The  Registrant  undertakes  to  furnish  to  each  person  to  whom a
          prospectus  is  delivered  a copy of the  Registrant's  latest  annual
          report to shareholders, upon request and without charge.

     (2)  The Registrant  undertakes to call a meeting of  shareholders  for the
          purpose of voting upon the removal of a director or  directors  and to
          assist in  communications  with  other  shareholders  as  required  by
          Section 16(c) of the Investment Company Act of 1940.


<PAGE>



                                   SIGNATURES

   Pursuant to the requirements of the Securities Act of 1933 and the Investment
Company  Act  of  1940,  the  Registrant  certifies  that  it  meets  all of the
requirements for effectiveness of this Post-Effective Amendment pursuant to Rule
485(b) under the Securities Act of 1933 and has duly caused this  Post-Effective
Amendment No. 23 to the Registration Statement to be signed on its behalf by the
undersigned,  thereunto duly  authorized,  in the City of New York, State of New
York, on the 1st day of June, 1998.

                                            SELIGMAN PORTFOLIOS, INC.


                                            By:      /S/ WILLIAM C. MORRIS
                                                     ---------------------------
                                                     William C. Morris, Chairman


Pursuant to the  requirements  of the  Securities Act of 1933 and the Investment
Company Act of 1940, this  Post-Effective  Amendment No. 23 to the  Registration
Statement  has been signed below by the  following  persons,  in the  capacities
indicated on June 1, 1998.


   SIGNATURE                                             TITLE


/S/ WILLIAM C. MORRIS                           Chairman of the Board (Principal
- - ---------------------                          executive officer) and Director
    William C. Morris


/S/ BRIAN T. ZINO                               Director and President
- - -----------------
    Brian T. Zino



/S/ THOMAS G. ROSE                              Treasurer
- - ------------------
    Thomas G. Rose



John R. Galvin, Director                 )
Alice S. Ilchman, Director               )
Frank A. McPherson, Director             )
John E. Merow, Director                  )
Betsy S. Michel, Director                )  /S/ BRIAN T. ZINO
James C. Pitney, Director                )  -----------------
James Q. Riordan, Director               )  *Brian T. Zino, Attorney-In-Fact
Richard R. Schmaltz, Director            )
Robert L. Shafer, Director               )
James N. Whitson, Director               )


<PAGE>

                            SELIGMAN PORTFOLIOS, INC.
                     Post-Effective Amendment No. 23 to the
                       Registration Statement on Form N-1A



                                  EXHIBIT INDEX



FORM N-1A ITEM NO.            DESCRIPTION


     24(b)(10)            Opinion and Consent of Counsel




<TABLE>
<CAPTION>
SULLIVAN & CROMWELL
<S>                                                <C>
NEW YORK TELEPHONE: (212) 558-4000
TELEX: 62694 (INTERNATIONAL) 127816 (DOMESTIC)                       125 BROAD STREET, NEW YORK 10004-2498
CABLE ADDRESS: LADYCOURT, NEW YORK                                     ----------
FACSIMILE: (212) 558-3588 (125 Broad Street)                               375 PARK AVENUE, NEW YORK 10152
                                                   1701 PENNSYLVANIA AVE, N.W. WASHINGTON, D.C. 20006-5805
                                                           444 SOUTH FLOWER STREET, LOS ANGELES 90071-2901
                                                                             8, PLACE VENDOME, 75001 PARIS
                                                    ST. OLAVE'S HOUSE, 9a IRONMONGER LANE, LONDON EC2V 8EY
                                                                        101 COLLINS STREET, MELBOURNE 3000
                                                            2-1, MARUNOUCHI I-CHOME, CHIYODA-KU, TOKYO 100
                                                                     NINE QUEEN'S ROAD, CENTRAL, HONG KONG
</TABLE>




                                                                  April 28, 1998




Seligman Portfolios, Inc.,
   100 Park Avenue,
      New York, New York  10017.

Dear Sirs:

         In connection with Post-Effective  Amendment No. 23 to the Registration
Statement  on Form N-1A (File No.  33-15253)  of Seligman  Portfolios,  Inc.,  a
Maryland corporation (the "Fund"), which you expect to file under the Securities
Act of 1933, as amended (the  "Securities  Act"),  with respect to an indefinite
number of shares of Capital  Stock,  par value  $.001 per share,  of the classes
designated as Seligman  Large-Cap Value  Portfolio and Seligman  Small-Cap Value
Portfolio (the "Portfolios",  and the Shares of the Portfolios being referred to
herein as the  "Shares"),  we, as your counsel,  have  examined  such  corporate
records, certificates and other documents, and such questions of law, as we have
considered necessary or appropriate for the purposes of this opinion.

         Upon the basis of such examination, we advise you that, in our opinion,
the Shares have been duly authorized to the extent of 20,000,000  Shares of each
Portfolio,  and when the  Post-Effective  Amendment referred to above has become
effective under the Securities Act and the Shares of



<PAGE>



Seligman Portfolios, Inc.                                                   -2-


each  Portfolio  have been  issued  (a) for at least the par  value  thereof  in
accordance with the Registration  Statement  referred to above, (b) so as not to
exceed the then authorized number of Shares of the relevant Portfolio and (c) in
accordance with the authorization of the Board of Directors,  the Shares will be
duly and validly issued, fully paid and non-assessable.

         We have  relied as to certain  matters  on  information  obtained  from
public  officials,  officers of the Fund and other sources  believed by us to be
responsible.

         The  foregoing  opinion is limited  to the  federal  laws of the United
States and the  General  Corporation  Law of the State of  Maryland,  and we are
expressing no opinion as to the effect of the laws of any other jurisdiction.

         We hereby  consent to the  filing of this  opinion as an exhibit to the
Post-Effective  Amendment  referred to above. In giving such consent,  we do not
thereby  admit that we are in the category of person  whose  consent is required
under Section 7 of the Securities Act.

                                                            Very truly yours,

                                                            SULLIVAN & CROMWELL


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