SELIGMAN COMMON STOCK FUND INC
485APOS, 1999-02-24
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                                                                File No. 2-10835
                                                                         811-234

                       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. 77                                         |X|
    

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

   
     Amendment No. 25                                                        |X|
    


                        SELIGMAN COMMON STOCK FUND, 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):


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

|X|  on May 1, 1999 pursuant to paragraph (a)(1)
    

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

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

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

|_|  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.



<PAGE>

<PAGE>
 
SELIGMAN
COMMON STOCK
FUND, INC.

[GRAPHIC]

PROSPECTUS

MAY 1, 1999

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

Seeking Favorable Current 
Income and Long-Term 
Growth of Both Income and 
Capital Without Exposing 
Capital to Undue Risk


managed by
[LOGO]
J. & W. SELIGMAN & CO.
INCORPORATED
ESTABLISHED 1864



The Securities and Exchange Commission has neither approved nor disapproved this
Fund, and it has not determined the prospectus to be accurate or adequate. Any
representation to the contrary is a criminal offense.

An investment in this Fund or any other fund cannot provide a complete
investment program. The suitability of an investment in the Fund should be
considered based on the investment objective, strategies and risks described
herein, considered in light of all of the other investments in your portfolio,
as well as your risk tolerance, financial goals and time horizons. We recommend
that you consult your financial advisor to determine if this Fund is suitable
for you.


EQCS1 5/99
<PAGE>
 
[GRAPHIC]

TABLE OF CONTENTS

THE FUND
    Investment Objective/Principal Strategies   1
    Principal Risks   2
    Past Performance   3
    Fees and Expenses   4
    Management   5
    Year 2000   6

SHAREHOLDER INFORMATION
    Deciding Which Class of Shares to Buy   7
    Pricing of Fund Shares   9
    Opening Your Account   9
    How to Buy Additional Shares   10
    How to Exchange Shares Between
      The Seligman Mutual Funds   11
    How to Sell Shares   11
    Important Policies That May Affect
      Your Account   12
    Dividends and Capital Gain Distributions   13
    Taxes   13
    The Seligman Mutual Funds   14

FINANCIAL HIGHLIGHTS   15

HOW TO CONTACT US   17

FOR MORE INFORMATION   back cover

TIMES CHANGE ... VALUES ENDURE
<PAGE>
 
The Fund
 
Investment Objective/Principal Strategies
   
The Fund's objectives are to produce favorable, but not the highest, current
income and long-term growth of both income and capital value, without exposing
capital to undue risk.     
   
The Fund uses the following principal strategies to seek its objectives:     
   
Generally, the Fund invests a majority of its assets in common stocks, broadly
diversified among a number of industries. The Fund usually invests in the
common stock of larger US companies; however, it may invest in companies of any
size. While common stocks have for many years been the predominant type of
security owned by the Fund, substantial portions of the Fund's assets have been
held, and may be held, in cash and fixed-income securities.     
   
The Fund uses a bottom-up stock selection approach. This means the investment
manager concentrates on individual company fundamentals, rather than on a
particular industry. The Fund seeks to purchase strong, well-managed companies
that have the potential for solid earnings growth and dividend increases.     
   
The investment manager identifies companies that have attractive dividend
yields relative to the market and that typically display relatively low
valuations based on one or more of the following measures: price-to-earnings,
price-to-cash flow, price-to-sales, and price-to-book value. The investment
manager then uses in-depth research into each company that meets its
preliminary criteria to identify those companies that it believes possess a
catalyst for earnings acceleration.     
 
The Fund generally sells a stock if the investment manager believes one or more
of the following:
     
  .the stock is over valued or fully valued     
     
  .its dividend yield is not competitive compared to the yields offered by
  other securities in its industry     
     
  .its earnings are disappointing or the catalyst for earnings acceleration
  no longer exists     
     
  .the company's underlying fundamentals have deteriorated     
     
  .there are more attractive investment opportunities     
   
The Fund may, from time to time, take temporary defensive positions that are
inconsistent with its principal strategies in seeking to minimize extreme
volatility caused by adverse market, economic, or other conditions. This could
prevent the Fund from achieving its objectives.     
   
The Fund may purchase American Depositary Receipts (ADRs), which are publicly
traded instruments generally issued by domestic banks or trust companies that
represent a security of a foreign issuer. The Fund may invest up to 15% of its
net assets in illiquid securities (i.e., securities that cannot be readily
sold) and may invest up to 10% of its total assets directly in foreign
securities (which does not include ADRs).     
   
The Fund may change its principal strategies if the Fund's Board of Directors
believes doing so is consistent with the Fund's investment objectives.     
   
The Fund's objectives are a fundamental policy and may be changed only with the
approval of shareholders. As with any mutual fund, there is no guarantee the
Fund will achieve its objectives.     
 
 
                                       1
<PAGE>
 
Principal Risks
          
Stock prices fluctuate. Therefore, as with any fund that invests in stocks, the
Fund's net asset value will fluctuate, especially in the short term. You may
experience a decline in the value of your investment and you could lose money.
       
While the Fund maintains exposure to varied industry sectors over the longer
term, it may invest more heavily in certain industries believed to offer good
investment opportunities. To the extent that an industry in which the Fund is
invested falls out of favor, the Fund's performance may be negatively affected.
       
The Fund's performance may be affected by the broad investment environment in
the US or international securities markets, which is influenced by, among other
things, interest rates, inflation, politics, fiscal policy, and current events.
       
Stocks of large US companies, like those in which the Fund generally invests,
are experiencing an extended period of strong performance. However, if investor
sentiment changes, the value of large company stocks may decline. This could
have an adverse effect on the Fund's performance.     
   
To the extent that the Fund invests some of its assets in higher-risk
securities, such as foreign or illiquid securities, it may be subject to higher
price volatility. Investing in securities of foreign issuers involves risks not
associated with US investments, including currency fluctuations, foreign
taxation, differences in financial reporting practices, and changes in
political conditions.     
   
The Fund may actively and frequently trade securities in its portfolio to carry
out its principal strategies. A high Fund turnover rate results in
correspondingly greater transaction costs for the Fund and a possible increase
in short-term capital gains and losses.     
   
An investment in the Fund is not a deposit in a bank and is not insured or
guaranteed by the Federal Deposit Insurance Corporation or any other government
agency.     
 
                                       2
<PAGE>
 
Past Performance
   
The Fund offers three Classes of shares. The information below provides some
indication of the risks of investing in the Fund by showing how the performance
of Class A shares has varied year to year, as well as how each Class's
performance compares to one widely-used measure of stock performance, and one
measure of the performance of mutual funds with investment objectives similar
to the Fund.     
   
The following performance information is designed to assist you in comparing
the returns of the Fund with the returns of other mutual funds. How the Fund
has performed in the past, however, is not necessarily an indication of how the
Fund will perform in the future. Total returns will vary between each Class of
shares due to the different fees and expenses of each Class.     
 
The Class A annual total returns presented in the bar chart do not reflect the
effect of any sales charges. If these charges were included, the returns would
be less. The average annual total returns presented in the table below the
chart do reflect the effect of the applicable sales charges. Both the bar chart
and table assume that all dividends and capital gain distributions were
reinvested.
  
                          Class A Annual Total Returns

                            [BAR GRAPH APPEARS HERE]
 
 1989   1990   1991   1992   1993   1994   1995   1996   1997   1998
- - ----   ----   ----   ----   ----   ----   ----   ----   ----   ----
 
26.8%  -3.9%  29.9%  10.9%  14.9%  -1.9%  28.2%  15.4%  23.6%  17.4%
 
Best calendar quarterly return: XX.X% - quarter ended ___
 
Worst calendar quarterly return: XX.X% - quarter ended ___
 
             Average Annual Total Returns - Periods Ended 12/31/98
 
<TABLE>   
<CAPTION>
                                                   CLASS B         CLASS D
                           ONE   FIVE    TEN   SINCE INCEPTION SINCE INCEPTION
                          YEAR   YEARS  YEARS      4/22/96         5/3/93
                          -----  -----  -----  --------------- ---------------
  <S>                     <C>    <C>    <C>    <C>             <C>
  Class A                 11.84% 14.94% 15.00%         --              --
  Class B                 11.53    n/a    n/a       17.09%             --
  Class D                 15.56  15.05    n/a          --           14.92%
  S&P 500                 28.58  24.06  19.21       29.00(/1/)      22.63(/2/)
  Lipper Growth & Income
   Funds Average          15.32  18.32  15.76       20.66(/1/)      17.73(/2/)
</TABLE>    
    
 The Standard & Poor's 500 Composite Stock Price Index (S&P 500) and the
 Lipper Growth & Income Funds Average are unmanaged benchmarks that assume
 the reinvestment of dividends and capital gain distributions. The Lipper
 Growth & Income Funds Average does not reflect any sales charges and the
 S&P 500 does not reflect any fees or sales charges. The S&P 500 Index
 measures the performance of the 500 largest US stocks, and the Lipper
 Growth & Income Funds Average measures the performance of mutual funds with
 investment objectives similar to the Fund.     
    
 (/1/From)April 30, 1996.     
    
 (/2/From)April 30, 1993.     
 
                                       3
<PAGE>
 
Fees and Expenses
 
The table below summarizes the fees and expenses that you may pay as a
shareholder of the Fund. Each Class of shares has its own sales charge schedule
and is subject to different ongoing 12b-1 fees. Shareholder fees are charged
directly to you. Annual fund operating expenses are deducted from Fund assets
and are therefore paid indirectly by you and other shareholders of the Fund.
 
<TABLE>   
<CAPTION>
Shareholder Fees                                   Class A       Class B Class D
- - ----------------                                   -------       ------- -------
<S>                                                <C>           <C>     <C>
Maximum Sales Charge (Load) on Purchases
 (as a % of offering price).......................  4.75% (/1/)   none    none
Maximum Contingent Deferred Sales Charge (Load)
 (CDSC) on Redemptions
 (as a % of original purchase price or current net
 asset value,
 whichever is less)...............................  none  (/1/)     5%      1%

Annual Fund Operating Expenses for 1998
- - ---------------------------------------
(as a percentage of average net assets)
Management Fees...................................   .65%          .65%    .65%
Distribution and/or Service (12b-1) Fees..........   .24%         1.00%   1.00%
Other Expenses....................................   .22%          .22%    .22%
                                                    ----          ----    ----
Total Annual Fund Operating Expenses..............  1.11%         1.87%   1.87%
                                                    ====          ====    ====
</TABLE>    
   
(/1/) If you buy Class A shares for $1,000,000 or more you will not pay an
    initial sales charge, but your shares will be subject to a 1% CDSC if sold
    within 18 months.     
 
                               Example
 
 
                               This example is intended to help you compare the
 Management Fees:              expenses of investing in the Fund with the
 Fees paid out of Fund         expenses of investing in other mutual funds. It
 assets to the                 assumes (1) you invest $10,000 in the Fund for
 investment manager to         each period and then sell all of your shares at
 compensate it for             the end of that period, (2) your investment has
 managing the Fund.            a 5% return each year, and (3) the Fund's
                               operating expenses remain the same. Although
                               your actual expenses may be higher or lower,
                               based on these assumptions your expenses would
                               be:
 
 12b-1 Fees:                            1 Year 3 Years 5 Years 10 Years     
                                        ------ ------- ------- --------     
 Fees paid by each             Class A                                     
 Class, pursuant to a          Class B                                     
 plan adopted by the           Class D                                      
 Fund under Rule 12b-1
 of the Investment
 Company Act of 1940.          If you did not sell your shares at the end of    
 The plan allows each          each period, your expenses would be:             
 Class to pay                                                                   
 distribution and/or                                                            
 service fees for the                                                           
 sale and distribution                                                          
 of its shares and for                  1 Year 3 Years 5 Years 10 Years         
 providing services to                  ------ ------- ------- --------         
 shareholders.                 Class A                                          
                               Class B                                          
                               Class D
 Other Expenses:   

 Miscellaneous expenses
 of running the Fund,          + Class B shares will automatically convert to
 including such things           Class A shares after eight years.           
 as transfer agency,
 registration, custody,
 and auditing and legal
 fees.
 
                                       4
<PAGE>
 
Management
 
The Fund's Board of Directors provides broad supervision over the affairs of
the Fund.
 
The Fund's manager is J. & W. Seligman & Co. Incorporated (Seligman), 100 Park
Avenue, New York, New York 10017. Seligman manages the investment of the Fund's
assets, including making purchases and sales of portfolio securities consistent
with the Fund's investment objective and strategies, and administers the Fund's
business and other affairs.
 
Established in 1864, Seligman currently serves as manager to 18 US registered
investment companies, which offer more than 50 investment portfolios with
approximately $XX.X billion in assets as of March 31, 1999. Seligman also
 
provides investment management or advice to institutional or other accounts
having an aggregate value at March 31, 1999, of approximately $XX.X billion.
   
The Fund pays Seligman a fee for its management services. The fee rate declines
as the Fund's net assets increase. It is equal to an annual rate of .65% of the
Fund's average daily net assets on the first $1 billion of net assets, .60% of
the Fund's average daily net assets on the next $1 billion of net assets and
 .55% of the Fund's average daily net assets in excess of $2 billion. The fee
paid by the Fund to Seligman for the Fund's fiscal year ended December 31,
1998, was equal to an annual rate of .65% of the Fund's average daily net
assets.     
          
Portfolio Management     
   
The Fund is managed by the Seligman Growth and Income Team, headed by Charles
C. Smith, Jr. Mr. Smith, a Managing Director of Seligman, is a Vice President
of the Fund and has been Portfolio Manager of the Fund since December 1991. Mr.
Smith joined Seligman in 1985 as Vice President, Investment Officer. He became
Senior Vice President, Senior Investment Officer in 1992, and Managing Director
in January 1994. Mr. Smith also manages Seligman Income Fund, Inc.; and he
manages the Seligman Common Stock Portfolio and the Seligman Income Portfolio,
two portfolios of Seligman Portfolios, Inc.     
   
Rodney D. Collins, Senior Vice President, Investment Officer of Seligman since
January 1999, co-manages the Fund. Mr. Collins joined Seligman in 1992 as a
Vice President, Investment Officer. Mr. Collins also co-manages Seligman Income
Fund, Inc.; and he co-manages the Seligman Common Stock Portfolio and the
Seligman Income Portfolio, two portfolios of Seligman Portfolios, Inc.     
 
  Affiliates of Seligman:
 
  Seligman Advisors, Inc. (Seligman Advisors):
  The Fund's general
  distributor; responsible
  for accepting orders for
  purchases and sales of Fund
  shares.
     
  Seligman Services, Inc.:     
  A limited purpose
  broker/dealer; acts as the
  broker/dealer of record for
  shareholder accounts that
  do not have a designated
  financial advisor.
 
  Seligman Data Corp. (SDC):
  The Fund's shareholder
  service agent; provides
  shareholder account
  services to the Fund at
  cost.
 
                                       5
<PAGE>
 
Year 2000
 
As the millennium approaches, mutual funds, financial and business
organizations, and individuals could be adversely affected if their computer
systems do not properly process and calculate date-related information and data
on and after January 1, 2000. Like other mutual funds, the Fund relies upon
service providers and their computer systems for its day-to-day operations.
Many of the Fund's service providers in turn depend upon computer systems of
their vendors. Seligman and SDC have established a year 2000 project team. The
team's purpose is to assess the state of readiness of Seligman and SDC and the
Fund's other service providers and vendors. The team is comprised of several
information technology and business professionals as well as outside
consultants. The Project Manager of the team reports directly to the
Administrative Committee of Seligman. The Project Manager and other members of
the team also report to the Board of Directors of the Fund and its Audit
Committee.
   
The team has identified the service providers and vendors who furnish critical
services or software systems to the Fund, including securities firms that
execute portfolio transactions for the Fund and firms responsible for
shareholder account recordkeeping. The team is working with these critical
service providers and vendors to evaluate the impact year 2000 issues may have
on their ability to provide uninterrupted services to the Fund. The team will
assess the feasibility of their year 2000 plans. The team has made progress on
its year 2000 contingency plans - recovery efforts the team will employ in the
event that year 2000 issues adversely affect the Fund. The team anticipates
finalizing these plans in the near future.     
   
The Fund anticipates the team will implement all significant components of the
team's year 2000 plans by mid-1999, including appropriate testing of critical
systems and receipt of satisfactory assurances from critical service providers
and vendors regarding their year 2000 compliance. The Fund believes that the
critical systems on which it relies will function properly on and after the
year 2000, but this is not guaranteed. If these systems do not function
properly, or the Fund's critical service providers are not successful in
implementing their year 2000 plans, the Fund's operations may be adversely
affected, including pricing, securities trading and settlement, and the
provision of shareholder services.     
   
In addition, the Fund may hold securities of issuers whose underlying business
leaves them susceptible to year 2000 issues. The Fund may also hold securities
issued by governmental or quasi-governmental issuers, which, like other
organizations, are also susceptible to year 2000 concerns. Year 2000 issues may
affect an issuer's operations, creditworthiness, and ability to make timely
payment on any indebtedness and could have an adverse impact on the value of
its securities. If the Fund holds these securities, the Fund's performance
could be negatively affected. Seligman seeks to identify an issuers state of
year 2000 readiness as part of the research it employs. However, the perception
of an issuer's year 2000 preparedness is only one of the many factors
considered in determining whether to buy, sell, or continue to hold a security.
Information provided by issuers concerning their state of readiness may or may
not be accurate or readily available. Further, the Fund may be adversely
affected if the exchanges, markets, depositories, clearing agencies, or
government or third parties responsible for infrastructure needs do not address
their year 2000 issues in a satisfactory manner.     
 
SDC has informed the Fund that it does not expect the cost of its services to
increase materially as a result of the modifications to its computer systems
necessary to prepare for the year 2000. The Fund will not pay to remediate the
systems of Seligman or bear directly the costs to remediate the systems of any
other service providers or vendors, other than SDC.
                                       6
<PAGE>
 
Shareholder Information
 
Deciding Which Class of Shares to Buy
 
Each of the Fund's Classes represents an interest in the same portfolio of
investments. However, each Class has its own sales charge schedule and is
subject to different ongoing 12b-1 fees. When deciding which Class of shares
to buy, you should consider, among other things:
  . The amount you plan to invest.
  . How long you intend to remain invested in the Fund, or another Seligman
    mutual fund.
  . If you would prefer to pay an initial sales charge and lower ongoing 12b-1
    fees, or be subject to a CDSC and pay higher ongoing 12b-1 fees.
  . Whether you may be eligible for reduced or no sales charges when you buy
    or sell shares.
Your financial advisor will be able to help you decide which Class of shares
best meets your needs.
 
Class A
  .Initial sales charge on Fund purchases, as set forth below:
<TABLE>
<CAPTION>
                                                       Sales Charge   Regular Dealer
                                    Sales Charge          as a %         Discount
                                       as a %             of Net        as a % of
   Amount of your Investment   of Offering Price(/1/) Amount Invested Offering Price
   -------------------------   ---------------------- --------------- --------------
   <S>                         <C>                    <C>             <C>
   Less than $ 50,000                   4.75%              4.99%           4.25%
   $50,000 - $ 99,999                   4.00               4.17            3.50
   $100,000 - $249,999                  3.50               3.63            3.00
   $250,000 - $499,999                  2.50               2.56            2.25
   $500,000 - $999,999                  2.00               2.04            1.75
   $1,000,000 and
    over(/2/)                           0.00               0.00            0.00
</TABLE>
 
  (/1/"Offering)Price" is the amount that you actually pay for Fund shares;
      it includes the initial sales charge.
  (/2/You)will not pay a sales charge on purchases of $1 million or more, but
      you will be subject to a 1% CDSC if you sell your shares within 18
      months.
 
  .Annual 12b-1 fee (for shareholder services) of up to 0.25%.
  .No sales charge on reinvested dividends or capital gain distributions.
 
Class B
  .No initial sales charge on purchases.
  .A declining CDSC on shares sold within 6 years of purchase:
 
<TABLE>                                          
<CAPTION>                                     Your purchase of Class B
  Years Since Purchase                  CDSC  shares must be for less than
  --------------------                  ----  $250,000, because if you are
  <S>                                   <C>   investing $250,000 or more
  Less than 1 year                        5%  you will pay less in fees
  1 year or more but less than 2 years    4   and charges if you buy
  2 years or more but less than 3             another Class of shares.
   years                                  3       
  3 years or more but less than 4
   years                                  3
  4 years or more but less than 5
   years                                  2
  5 years or more but less than 6
   years                                  1
  6 years or more                         0
</TABLE>
 
  .Annual 12b-1 fee (for distribution and shareholder services) of 1.00%.
  .Automatic conversion to Class A shares after eight years, resulting in
  lower ongoing 12b-1 fees.
  .No CDSC on redemptions of shares purchased with reinvested dividends or
  capital gain distributions.
 
                                       7
<PAGE>
 
Class D
  . No initial sales charge on purchases.
  . A 1% CDSC on shares sold within one year of purchase.
  . Annual 12b-1 fee (for distribution and shareholder services) of 1.00%.
  . No automatic conversion to Class A shares, so you will be subject to
    higher ongoing 12b-1 fees indefinitely.
  . No CDSC on redemptions of shares purchased with reinvested dividends or
    capital gain distributions.
   
Because 12b-1 fees are paid out of each Class's assets on an ongoing basis,
over time these fees will increase your investment expenses and may cost you
more than other types of sales charges.     
 
The Fund's Board of Directors believes that no conflict of interest currently
exists between the Fund's Class A, Class B, and Class D shares. On an ongoing
basis, the Directors, in the exercise of their fiduciary duties under the
Investment Company Act of 1940 and Maryland law, will seek to ensure that no
such conflict arises.
 
How CDSCs Are Calculated
 
To minimize the amount of CDSC you may pay when you sell your shares, the
Fund assumes that shares acquired through reinvested dividends and capital
gain distributions (which are not subject to a CDSC) are sold first. Shares
that have been in your account long enough so they are not subject to a CDSC
are sold next. After these shares are exhausted, shares will be sold in the
order they were purchased (oldest to youngest). The amount of any CDSC that
you pay will be based on the shares' original purchase price or current net
asset value, whichever is less.
   
You will not pay a CDSC when you exchange shares of the Fund to buy the same
class of shares of any other Seligman mutual fund. For the purpose of
calculating the CDSC when you sell shares that you acquired by exchanging
shares of the Fund, it will be assumed that you held the shares since the
date you purchased the shares of the Fund.     
 
                                       8
<PAGE>
 
Pricing of Fund Shares
   
When you buy or sell shares, you do so at the Class's net asset value (NAV)
next calculated after Seligman Advisors accepts your request. Any applicable
sales charge will be added to the purchase price for Class A shares. Purchase
or sale orders received by an authorized dealer or financial advisor by the
close of regular trading on the New York Stock Exchange (NYSE) (normally 4:00
p.m. Eastern time) and accepted by Seligman Advisors before the close of
business (5:00 p.m. Eastern time) on the same day will be executed at the
Class's NAV calculated as of the close of regular trading on the NYSE on that
day. Your broker/dealer or financial advisor is responsible for forwarding your
order to Seligman Advisors before the close of business.     
 
NAV:                   If your buy or sell order is received by your
Computed               broker/dealer or financial advisor after the close of
separately for         regular trading on the NYSE, or is accepted by Seligman
each Class by          Advisors after the close of business, the order will be
dividing that          executed at the Class's NAV calculated as of the close
Class's share of       of regular trading on the next NYSE trading day. When
the net assets of      you sell shares, you receive the Class's per share NAV,
the Fund (i.e.,        less any applicable CDSC.
its assets less    
liabilities) by        The NAV of the Fund's shares is determined each day,
the total number       Monday through Friday, on days that the NYSE is open for
of outstanding         trading. Because of their higher 12b-1 fees, the NAV of
shares of the          Class B and Class D shares will generally be lower than
Class.                 the NAV of Class A shares.
 
                       Securities owned by the Fund are valued at current
                       market prices. If reliable market
prices are unavailable, securities are valued in accordance with procedures
approved by the Fund's Board of Directors.
 
Opening Your Account
 
The Fund's shares are sold through authorized broker/dealers or financial
advisors who have sales agreements with Seligman Advisors. There are several
programs under which you may be eligible for reduced sales charges. Ask your
financial advisor if any of these programs apply to you.
 
To make your initial investment in the Fund, contact your financial advisor or
complete an account application and send it with your check directly to SDC at
the address provided on the account application. If you do not choose a Class,
your investment will automatically be made in Class A shares.
 
 You may buy shares of the  
 Fund for all types of tax- 
 deferred retirement plans. 
 Contact Retirement Plan    
 Services at the address or 
 phone number listed on the 
 inside back cover of this  
 prospectus for information 
 and to receive the proper  
 forms.                      

The required minimum initial investments are:
 
    . Regular (non-retirement) accounts:$1,000
 
    . For accounts opened concurrently with Invest-A-Check(R):
      $100 to open if you will be making monthly investments
      $250 to open if you will be making quarterly investments
   
If you buy shares by check and subsequently
sell the shares, SDC will not     
   
send your proceeds until your check clears, which could take up to 15 calendar
days from the date of your purchase.     
 
You will be sent a statement confirming your Fund purchase, and any subsequent
transactions in your account. You will also be sent at least annually, a
statement detailing all your transactions in the Fund and all other Seligman
funds you own. Duplicate account statements will be sent to you free of charge
for the current year and most recent prior year. Copies of year-end statements
for prior years are available for a fee of $10 per year, per account, with a
maximum charge of $150 per account. Send your request and a check for the fee
to SDC.
 
   If you want to be able to buy, sell, or exchange shares by telephone,
    you should complete an application when you open your account. This
   will prevent you from having to complete a supplemental election form
         (which may require a signature guarantee) at a later date.
 
 
                                       9
<PAGE>
 
How to Buy Additional Shares
 
After you have made your initial investment, there are many options available
to make additional purchases of Fund shares. Shares may be purchased through
your authorized financial advisor, or you may send a check directly to SDC.
Please provide either an investment slip or a note that provides your name(s),
Fund name, and account number. Your investment will be made in the Class you
already own. Send investment checks to:
      Seligman Data Corp.
      P.O. Box 9766
      Providence, RI 02940-5051
 
Your check must be in US dollars and be drawn on a US bank. You may not use
third party or credit card convenience checks for investment.
 
You may also use the following account services to make additional investments:
 
Invest-A-Check(R). You may buy Fund shares electronically from a savings or
checking account of an Automated Clearing House (ACH) member bank. If your bank
is not a member of ACH, the Fund will debit your checking account by
preauthorized checks. You may buy Fund shares at regular monthly intervals in
fixed amounts of $100 or more, or regular quarterly intervals in fixed amounts
of $250 or more. If you use Invest-A-Check(R), you must continue to make
automatic investments until the Fund's minimum initial investment of $1,000 is
met or your account may be closed.
 
Automatic Dollar-Cost-Averaging. If you have at least $5,000 in Seligman Cash
Management Fund, you may exchange uncertificated shares of that fund to buy
shares of the same class of another Seligman mutual fund at regular monthly
intervals in fixed amounts of $100 or more or regular quarterly intervals in
fixed amounts of $250 or more. If you exchange Class A shares, you may pay an
initial sales charge to buy Fund shares.
   
Automatic CD Transfer. You may instruct your bank to invest the proceeds of a
maturing bank certificate of deposit (CD) in shares of the Fund. If you wish to
use this service, contact SDC or your financial advisor to obtain the necessary
forms. Because your bank may charge you a penalty, it is not normally advisable
to withdraw CD assets before maturity.     
 
Dividends From Other Investments. You may have your dividends from other
companies paid to the Fund. (Dividend checks must include your name, account
number, Fund name, and Class of shares.)
 
Direct Deposit. You may buy Fund shares electronically with funds from your
employer, the IRS, or any other institution that provides direct deposit. Call
SDC for more information.
 
Seligman Time Horizon MatrixSM. (Requires an initial total investment of
$10,000.) This is a needs-based investment process, designed to help you and
your financial advisor plan to seek your long-term financial goals. It
considers your financial needs, and helps frame a personalized asset allocation
strategy around the cost of your future commitments and the time you have to
meet them. Contact your financial advisor for more information.
 
Seligman Harvester. If you are a retiree or nearing retirement, this program is
designed to help you establish an investment strategy that seeks to meet your
needs throughout your retirement. The strategy is customized to your personal
financial situation by allocating your assets to seek to address your income
requirements, prioritizing your expenses, and establishing a prudent withdrawal
schedule. Contact your financial advisor for more information.
 
                                       10
<PAGE>
 
How to Exchange Shares Between the Seligman Mutual Funds
   
You may sell Fund shares to buy shares of the same Class of another Seligman
mutual fund, or you may sell shares of another Seligman mutual fund to buy Fund
shares. Exchanges will be made at each fund's respective NAV. You will not pay
an initial sales charge when you exchange, unless you exchange Class A shares
of Seligman Cash Management Fund to buy Class A shares of the Fund or another
Seligman mutual fund.     
 
Only your dividend and capital gain distribution options and telephone services
will be automatically carried over to any new fund account. If you wish to
carry over any other account options (for example, Invest-a-Check(R) or
Systematic Withdrawals) to the new fund, you must specifically request so at
the time of your exchange.
 
If you exchange into a new fund, you must exchange enough to meet the new
fund's minimum initial investment.
 
See "The Seligman Mutual Funds" for a list of the funds available for exchange.
Before making an exchange, contact your financial advisor or SDC to obtain the
applicable fund prospectus(es), which you should read and understand before
investing.
 
How to Sell Shares
 
The easiest way to sell Fund shares is by phone. If you have telephone
services, you may be able use this service to sell Fund shares. Restrictions
apply to certain types of accounts. Please see "Important Policies That May
Affect Your Account."
   
When you sell Fund shares by phone, a check for the proceeds is sent to your
address of record. If you have current ACH bank information on file, you may
have the proceeds of the sale of your Fund shares directly deposited into your
bank account (typically, 3-4 business days after your shares are sold).     
 
You may always send a written request to sell Fund shares. It may take longer
to get your money if you send your request by mail.
 
You will need to guarantee your signature(s) if the proceeds are:
      (1) $50,000 or more;
      (2) to be paid to someone other than all account owners, or
      (3) mailed to other than your address of record.
 
 
   Signature Guarantee:
      
   Protects you and the Fund
   from fraud. It guarantees
   that a signature is
   genuine. A guarantee must
   be obtained from an
   eligible financial
   institution. Notarization
   by a notary public is not
   an acceptable guarantee.
       
You may need to provide additional documents to sell Fund shares if you are:
 .a corporation;
 .an executor or administrator;
 .a trustee or custodian; or
 .in a retirement plan.
 
If your Fund shares are represented by certificates, you will need to surrender
the certificates to SDC before you sell your shares.
 
Contact your financial advisor or SDC's Shareholder Services Department for
information on selling your shares under any of the above circumstances.
 
You may also use the following account service to sell Fund shares:
 
Systematic Withdrawal Plan. If you have at least $5,000 in the Fund, you may
withdraw (sell) a fixed amount (minimum of $50) of uncertificated shares at
regular intervals. A check will be sent to you at your address of record or, if
you have current ACH bank information on file, you may have your payments
directly deposited to your predesignated bank account in 3-4 business days
after your shares are sold. If you bought $1,000,000 or more of Class A shares
without an initial sales charge, your withdrawals may be subject to a 1% CDSC
if they occur within 18 months of purchase. If you own Class B or Class D
shares and reinvest your dividends and capital gain distributions, you may
withdraw 12% or 10%, respectively, of the value of your Fund account (at the
time of election) annually without a CDSC.
 
                                       11
<PAGE>
 
Important Policies That May Affect Your Account
 
To protect you and other shareholders, the Fund reserves the right to:
 
 . Refuse an exchange request if:
 
   1. you have exchanged twice from the same fund in any three-month period;
 
   2. the amount you wish to exchange equals the lesser of $1,000,000 or 1%
      of the Fund's net assets; or
 
   3. you or your financial advisor have been advised that previous patterns
      of purchases and sales or exchanges have been considered excessive.
 
 . Refuse any request to buy Fund shares.
 
 . Reject any request received by telephone.
 
 . Suspend or terminate telephone services.
 
 . Reject a signature guarantee that SDC believes may be fraudulent.
 
 . Close your fund account if its value falls below $500.
 
 . Close your account if it does not have a certified taxpayer identification
   number.
 
Telephone Services
 
You and your broker/dealer or financial advisor will be able to place the
following requests by telephone, unless you indicate on your account
application that you do not want telephone services:
    
 . Sell uncertificated shares (up to $50,000 per day, payable to account
   owner(s) and mailed to address of record)     
    
 . Exchange shares betweeen funds     
    
 . Change dividend and/or capital gain distribution options     
    
 . Change your Address     
 
 . Establish systematic withdrawals to address of record
 
If you do not complete an account application when you open your account,
telephone services must be elected on a supplemental election form.
 
Restrictions apply to certain types of accounts:
 
 . Trust accounts on which the current trustee is not listed may not sell Fund
   shares by phone.
 
 . Corporations may not sell Fund shares by phone.
 
 . IRAs may only exchange Fund shares or request address changes by phone.
 
 . Group retirement plans may not sell Fund shares by phone; plans that allow
   participants to exchange by phone must provide a letter of authorization
   signed by the plan custodian or trustee and provide a supplemental election
   form signed by all plan participants.
 
Unless you have current ACH bank information on file, you will not be able to
sell Fund shares by phone within thirty days following an address change.
 
Your request must be communicated to an SDC representative. You may not request
any phone transactions via the automated access line.
 
You may cancel telephone services at any time by sending a written request to
SDC. Each account owner, by accepting or adding telephone services, authorizes
each of the other owners to make requests by phone. Your broker/dealer or
financial advisor representative may not establish telephone services without
your written authorization. SDC will send written confirmation to the address
of record when telephone services are added or terminated.
 
During times of heavy call volume, you may not be able to get through to SDC by
phone to request a sale or exchange of Fund shares. In this case, you may need
to write, and it may take longer for your request to be processed. The Fund's
NAV may fluctuate during this time.
 
The Fund and SDC will not be liable for processing requests received by phone
as long as it was reasonable to believe that the request was genuine.
 
Reinstatement Privilege
 
If you sell Fund shares, you may, within 120 calendar days, use part or all of
the proceeds to buy shares of the Fund or any other Seligman mutual fund
(reinstate your investment) without paying an initial sales charge or, if you
paid a CDSC when you sold your shares, receiving a credit for the applicable
CDSC paid. This privilege is available only once each calendar year. Contact
your financial advisor for more information. You should consult your tax
advisor concerning possible tax consequences of exercising this privilege.
 
                                       12
<PAGE>
 
Dividends and Capital Gain Distributions
 
The Fund generally pays any dividends from its net investment income and
distributes net capital gains realized on investments annually. It is expected
that the Fund's distributions will be primarily capital gains.
 
                         You may elect to:
 Dividend:        
                   
 A payment by a          (1) reinvest both dividends and capital gain
 mutual fund,                distributions;
 usually derived   
 from the fund's            
 net investment          (2) receive dividends in cash and reinvest capital
 income                      gain distributions; or     
 (dividends and    
 interest earned                                                              
 on portfolio            (3) receive both dividends and capital gain          
 securities less             distributions in cash.                           
 expenses).                                                                   
                         Your dividends and capital gain distributions will be
 Capital Gain            reinvested if you do not instruct otherwise or if you
  Distribution:          own Fund shares in a Seligman tax-deferred retirement
 A payment to            plan.                                                
 mutual fund                                                                   
 shareholders            If you want to change your election, you may write SDC
 which                   at the address listed on the back cover of this       
 represents              prospectus, or, if you have telephone services, you or
 profits                 your financial advisor may call SDC. Your request must
 realized on the         be received by SDC before the record date to be       
 sale of                 effective for that dividend or capital gain           
 securities in a         distribution.                                         
 fund's                                                                        
 portfolio.              Cash dividends or capital gain distributions will be
                         sent by check to your address of record or, if you
                         have current ACH bank information on file, directly
 Ex-dividend Date:       deposited into your predesignated bank account within
 The day on              3-4 business days from the payable date.
 which any            
 declared                Dividends and capital gain distributions are
 distributions           reinvested to buy additional Fund shares on the
 (dividends or           payable date using the NAV of the ex-dividend date.
 capital gains)      
 are deducted        
 from a fund's           Dividends on Class B and Class D shares will be lower
 assets before           than the dividends on Class A shares as a result of
 it calculates           their higher 12b-1 fees. Capital gain distributions
 its NAV.                will be paid in the same amount for each Class.
                      
Taxes
 
The tax treatment of dividends and capital gain distributions is the same
whether you take them in cash or reinvest them to buy additional Fund shares.
Tax-deferred retirement plans are not taxed currently on dividends or capital
gain distributions or on exchanges.
   
You may be taxed at different rates on capital gains distributed by the Fund
depending on the length of time the Fund holds its assets.     
 
When you sell Fund shares, any gain or loss you realize will generally be
treated as a long-term capital gain or loss if you held your shares for more
than one year, or as a short-term capital gain or loss if you held your shares
for one year or less. However, if you sell Fund shares on which a long-term
capital gain distribution has been received and you held the shares for six
months or less, any loss you realize will be treated as a long-term capital
loss to the extent that it offsets the long-term capital gain distribution.
 
An exchange of Fund shares is a sale and may result in a gain or loss for
federal income tax purposes.
 
Each January, you will be sent information on the tax status of any
distributions made during the previous calendar year. Because each
shareholder's situation is unique, you should always consult your tax advisor
concerning the effect income taxes may have on your individual investment.
 
                                       13
<PAGE>
 
The Seligman Mutual Funds
 
Equity
 
Specialty
- - --------------------------------------------------------------------------------
Seligman Communications and
Information Fund
 
Seeks capital appreciation by investing in companies operating in all aspects
of the communications, information, and related industries.
   
Seligman Henderson Global Technology Fund     
 
Seeks long-term capital appreciation by investing primarily in global
securities (US and non-US) of companies in the technology and technology-
related industries.
   
Seligman Henderson Emerging Markets Growth Fund     
 
Seeks long-term capital appreciation by investing primarily in equity
securities of companies in emerging markets.
 
Small Company
- - --------------------------------------------------------------------------------
Seligman Frontier Fund
   
Seeks growth of capital by investing primarily in small company growth stocks.
    
Seligman Small-Cap Value Fund
   
Seeks long-term capital appreciation by investing in equities of small
companies, deemed to be "value" companies by the investment manager.     
   
Seligman Henderson Global Smaller Companies Fund     
 
Seeks long-term capital appreciation by investing in securities of smaller
companies around the world, including the US.
 
Medium Company
- - --------------------------------------------------------------------------------
Seligman Capital Fund
 
Seeks capital appreciation by investing in the common stocks of companies with
significant potential for growth.
 
Large Company
- - --------------------------------------------------------------------------------
Seligman Growth Fund
 
Seeks long-term growth of capital value and an increase in future income.
   
Seligman Henderson Global Growth Opportunities Fund     
 
Seeks capital appreciation by investing primarily in equity securities of
companies that have the potential to benefit from global economic or social
trends.
 
Seligman Large-Cap Value Fund
   
Seeks long-term capital appreciation by investing in equities of large
companies, deemed to be "value" companies by the investment manager.     
 
Seligman Common Stock Fund
 
Seeks favorable, but not the highest, current income and long-term growth of
both income and capital, without exposing capital to undue risk.
   
Seligman Henderson International Fund     
 
Seeks long-term capital appreciation by investing in securities of medium- to
large-sized companies, primarily in the developed markets outside the US.
 
Balanced
- - --------------------------------------------------------------------------------
Seligman Income Fund
 
Seeks high current income and improvement in capital value over the long term,
consistent with prudent risk of capital.
 
Fixed-Income
 
Income
- - --------------------------------------------------------------------------------
Seligman High-Yield Bond Fund
 
Seeks to maximize current income by investing in a diversified portfolio of
high-yielding, high-risk corporate bonds, commonly referred to as "junk bonds."
 
Seligman U.S. Government Securities Fund
 
Seeks high current income primarily by investing in a diversified portfolio of
securities guaranteed by the US government, its agencies, or instrumentalities,
which have maturities greater than one year.
 
Municipal
- - --------------------------------------------------------------------------------
Seligman Municipal Funds:
   
National Fund     
 
Seeks maximum income, exempt from regular federal income taxes.
   
State-specific funds:*     
 
Seek to maximize income exempt from regular federal income taxes and from
regular income taxes in the designated state.
<TABLE>
 <S>                            <C>                                             <C>
 California                     Louisiana                                       New Jersey
 .High-Yield                    Maryland                                        New York
 .Quality                       Massachusetts                                   North Carolina
 Colorado                       Michigan                                        Ohio
 Florida                        Minnesota                                       Oregon
 Georgia                        Missouri                                        Pennsylvania
                                                                                South Carolina
</TABLE>
* A small portion of income may be subject to state taxes.
 
Money Market
- - --------------------------------------------------------------------------------
Seligman Cash Management Fund
 
Seeks to preserve capital and to maximize liquidity and current income, by
investing only in high-quality money market securities having a maturity of 90
days or less. The fund seeks to maintain a constant net asset value of $1.00
per share.
 
                                       14
<PAGE>
 
Financial Highlights
   
The tables below are intended to help you understand each Class's financial
performance for the past five years or, if less than five years, the period of
the Class's operations. Certain information reflects financial results for a
single share of a Class that was held throughout the periods shown. "Total
return" shows the rate that you would have earned (or lost) on an investment in
the Fund, assuming you reinvested all your dividends and capital gain
distributions. Total returns do not reflect any sales charges.        ,
independent auditors, have audited this information. Their report, along with
the Fund's financial statements, is included in the Fund's annual report, which
is available upon request.     
 
CLASS A
 
<TABLE>   
<CAPTION>
                                        Year ended December 31,
                              ------------------------------------------------
                                1998      1997      1996      1995      1994
                               ------    ------    ------    ------    ------
<S>                           <C>       <C>       <C>       <C>       <C>
Per Share Data*:
Net asset value, beginning
 of period..................  $  15.92  $  14.89  $  14.19  $  12.12  $  13.47
 
                                 -----     -----     -----     -----     -----
Income from investment
 operations:
 Net investment income .....      0.28      0.30      0.35      0.36      0.38
 Net gains or losses on
  securities (both realized
  and unrealized)...........      2.32      3.18      1.81      3.00     (0.64)
 Net gains or losses on
  foreign currency
  transactions (both
  realized and unrealized)..        --     (0.07)       --      0.01        --
 
                                 -----     -----     -----     -----     -----
Total from investment
 operations.................      2.60      3.41      2.16      3.37     (0.26)
 
                                 -----     -----     -----     -----     -----
Less distributions:
 Dividends (from net
  investment income)........     (0.28)    (0.32)    (0.34)    (0.36)    (0.37)
 Distributions (from capital
  gains)....................     (2.47)    (2.06)    (1.12)    (0.94)    (0.72)
 
                                 -----     -----     -----     -----     -----
Total distributions.........     (2.75)    (2.38)    (1.46)    (1.30)    (1.09)
 
                                 -----     -----     -----     -----     -----
Net asset value, end of
 period.....................  $  15.77  $  15.92  $  14.89  $  14.19  $  12.12
 
                                 =====     =====     =====     =====     =====
Total return................     17.40%    23.58%    15.44%    28.17%    (1.89)%
Ratios/Supplemental Data:
Net assets, end of period
 (in thousands).............  $760,176  $734,635  $656,260  $614,400  $510,956
Ratio of expenses to average
 net assets.................      1.11%     1.13%     1.15%     0.93%     0.85%
Ratio of net income to
 average net assets.........      1.73%     1.83%     2.36%     2.56%     2.93%
Portfolio turnover rate.....     93.67%   106.02%    56.10%    46.08%    57.17%
</TABLE>    
- - --------------
 * Per share amounts are calculated based on average shares outstanding.
 
                                       15
<PAGE>
 
<TABLE>   
<CAPTION>
                                  Year ended
                                 December 31,     4/22/96**
CLASS B                         ----------------     to
                                 1998     1997    12/31/96
                                -------  -------  ---------
<S>                             <C>      <C>      <C>         <C>      <C>
Per Share Data*:
Net asset value, beginning of
 period.......................  $ 15.88  $ 14.87   $ 14.80
 
                                  -----    -----     -----
Income from investment
 operations:
 Net investment income........     0.16     0.17      0.15
 Net gains or losses on
  securities (both realized
  and unrealized).............     2.31     3.17      1.20
 Net gains or losses on
  foreign currency
  transactions (both realized
  and unrealized).............       --    (0.07)       --
 
                                  -----    -----     -----
Total from investment
 operations...................     2.47     3.27      1.35
 
                                  -----    -----     -----
Less distributions:
 Dividends (from net
  investment income)..........    (0.17)   (0.20)    (0.16)
 Distributions (from
  capital gains)..............    (2.47)   (2.06)    (1.12)
 
                                  -----    -----     -----
Total distributions...........    (2.64)   (2.26)    (1.28)
 
                                  -----    -----     -----
Net asset value, end of
 period.......................  $ 15.71  $ 15.88   $ 14.87
 
                                  =====    =====     =====
Total return..................    16.48%   22.59%     9.21%
Ratios/Supplemental Data:
Net assets, end of period (in
 thousands)...................  $33,073  $19,568   $ 6,451
Ratio of expenses to average
 net assets...................     1.87%    1.89%     1.92%+
Ratio of net income to average
 net assets...................     0.97%    1.07%     1.55%+
Portfolio turnover rate.......    93.67%  106.02%    56.10%++
<CAPTION>
                                         Year ended December 31,
CLASS D                         ----------------------------------------------
                                 1998     1997      1996       1995     1994
                                ------   ------    ------     ------   ------
<S>                             <C>      <C>      <C>         <C>      <C>
Per Share Data*:
Net asset value, beginning of
 period.......................  $ 15.88  $ 14.87   $ 14.16    $ 12.07  $ 13.46
 
                                  -----    -----     -----      -----    -----
Income from investment
 operations:
 Net investment income........     0.16     0.17      0.24       0.24     0.22
 Net gains or losses on
  securities (both realized
  and unrealized) ............     2.32     3.18      1.80       3.0     (0.66)
 Net gains or losses on
  foreign currency
  transactions (both realized
  and unrealized).............       --    (0.07)       --       0.01       --
 
                                 ------    -----     -----      -----    -----
Total from investment
 operations...................     2.48     3.28      2.04       3.25     (.44)
 
                                 ------    -----     -----      -----    -----
Less distributions:
 Dividends (from net
  investment income)..........    (0.17)   (0.20)    (0.21)     (0.22)   (0.23)
 Distributions (from
  capital gains)..............    (2.47)   (2.06)    (1.12)     (0.94)   (0.72)
 
                                  -----    -----     -----      -----    -----
Total distributions...........    (2.64)   (2.26)    (1.33)     (1.16)   (0.95)
 
                                  -----    -----     -----      -----    -----
Net asset value, end of
 period.......................  $ 15.73  $ 15.89   $ 14.87    $ 14.16  $ 12.07
 
                                  =====    =====     =====      =====    =====
Total return..................    16.55%   22.66%    14.58%     27.17%   (3.24)%
Ratios/Supplemental Data:
Net assets, end of period (in
 thousands)...................  $85,608  $80,896   $63,938    $46,564  $14,416
Ratio of expenses to average
 net assets...................     1.87%    1.89%    (1.91)%     1.72%    1.96%
Ratio of net income to average
 net assets...................     0.97%    1.07%    (1.61)%     1.80%    1.68%
Portfolio turnover rate.......    93.67%  106.02%    56.10%     46.08%   57.17%
</TABLE>    
- - --------------
   
 * Per share amounts are calculated based on average shares outstanding.     
   
** Commencement of offering of shares.     
   
 + Annualized.     
   
++ For the year ended December 31, 1996.     
 
                                       16
<PAGE>
 
How to Contact Us
 
<TABLE>   
<S>                     <C>         <C>
The Fund                Write:      Corporate Communications/
                                    Investor Relations Department
                                    J. & W. Seligman & Co. Incorporated
                                    100 Park Avenue, New York, NY 10017
                        Phone:      Toll-Free (800) 221-7844 in the US or
                                    (212) 850-1864 outside the US
                        Website:    http://www.seligman.com
Your Regular
(Non-Retirement)
Account                 Write:      Shareholder Services Department
                                    Seligman Data Corp.
                                    100 Park Avenue, New York, NY 10017
                        Phone:      Toll-Free (800) 221-2450 in the US or
                                    (212) 682-7600 outside the US
                        Website:    http://www.seligman.com
Your Retirement
Account                 Write:      Retirement Plan Services
                                    Seligman Data Corp.
                                    100 Park Avenue, New York, NY 10017
                        Phone:      Toll-Free (800) 445-1777
</TABLE>    
 
 
                24-hour telephone access is available by
                dialing (800) 622-4597 on a touchtone
                telephone. You will have instant access to
                price, yield, account balance, most recent
                transaction, and other information.
 
                                       17
<PAGE>
 
For More Information

- - --------------------------------------------------------------------------------
The following information is available without charge upon request: Call toll-
free (800) 221-2450 in the US or (212) 682-7600 outside the US.

Statement of Additional Information (SAI) contains additional information about
the Fund. It is on file with the Securities and Exchange Commission (SEC) and is
incorporated by reference into (is legally part of) this prospectus.

Annual/Semi-Annual Reports contain additional information about the Fund's
investments. In the Fund's annual report, you will find a discussion of the
market conditions and investment strategies that significantly affected the
Fund's performance during its last fiscal year.
- - --------------------------------------------------------------------------------

Seligman Advisors, Inc.
an affiliate of 
[LOGO]
J. & W. SELIGMAN & CO.
INCORPORATED
ESTABLISHED 1864
100 Park Avenue, New York, NY 10017

Information about the Fund, including the SAI, can be viewed and copied at the
SEC's Public Reference Room in Washington, DC. For information about the
operation of the Public Reference Room, call (800) SEC-0330. The SAI,
Annual/Semi-Annual reports and other information about the Fund are also
available on the SEC's Internet site: http://www.sec.gov.

Copies of this information may be obtained, upon payment of a duplicating fee,
by writing: Public Reference Section of the SEC, Washington, DC 20549-6009.

SEC FILE NUMBER: 811-234

<PAGE>


                        SELIGMAN COMMON STOCK FUND, INC.



                       Statement of Additional Information
                                   May 1, 1999

                                 100 Park Avenue
                            New York, New York 10017
                                 (212) 850-1864
                       Toll Free Telephone: (800) 221-2450
      For Retirement Plan Information - Toll-Free Telephone: (800) 445-1777


This Statement of Additional  Information (SAI) expands upon and supplements the
information  contained in the current  Prospectus  of the Seligman  Common Stock
Fund, Inc., dated May 1, 1999. This SAI, although not in itself a prospectus, is
incorporated by reference into the Prospectus in its entirety. It should be read
in conjunction  with the Prospectus,  which you may obtain by writing or calling
the Fund at the above address or telephone numbers.

The financial statements and notes included in the Fund's Annual Report, and the
Independent Auditors' Report thereon, are incorporated herein by reference.  The
Annual  Report will be furnished to you without  charge if you request a copy of
this SAI.




                                  Table of Contents

          Fund History..................................................  2
          Description of the Fund and its Investments and Risks.........  2
          Management of the Fund........................................  5
          Control Persons and Principal Holders of Securities...........  10
          Investment Advisory and Other Services........................  10
          Brokerage Allocation and Other Practices......................  16
          Capital Stock and Other Securities ...........................  17
          Purchase, Redemption, and Pricing of Shares...................  17
          Taxation of the Fund..........................................  22
          Underwriters..................................................  23
          Calculation of Performance Data ..............................  25
          Financial Statements..........................................  27
          General Information...........................................  27
          Appendix .....................................................  28



<PAGE>


                                  Fund History

The Fund was incorporated under the laws of the state of Maryland in 1930.

              Description of the Fund and Its Investments and Risks

Classification

The Fund is a diversified  open-end  management  investment  company,  or mutual
fund.

Investment Strategies and Risks

The following information regarding the Fund's investments and risks supplements
the information contained in the Fund's Prospectus.

Foreign Securities.  The Fund may invest in commercial paper and certificates of
deposit  issued by foreign  banks and may invest in other  securities of foreign
issuers either directly or through American Depositary Receipts (ADRs), European
Depositary  Receipts  (EDRs),  or Global  Depositary  Receipts  (EDRs).  Foreign
investments  may be affected  favorably  or  unfavorably  by changes in currency
rates and exchange control regulation.  There may be less information  available
about a foreign company than about a US company and foreign companies may not be
subject to reporting  standards and requirements  comparable to those applicable
to US companies.  Foreign  securities  may not be as liquid as US securities and
there  may be  delays  and  risks  attendant  in  local  settlement  procedures.
Securities of foreign  companies may involve greater market risk than securities
of US  companies,  and  foreign  brokerage  commissions  and  custody  fees  are
generally higher than those in United States.  Investments in foreign securities
may also be subject to local economic or political risks, political instability,
the  possible  nationalization  of  issuers  and the  risk of  expropriation  or
restrictions  on the  repatriation  of proceeds of sale.  In  addition,  foreign
investments may be subject to withholding and other taxes.  Depositary  Receipts
are  instruments  generally  issued by domestic  banks or trust  companies  that
represent the deposits of a security of a foreign issuer. ADRs, which are traded
in dollars on US Exchanges or over-the-counter, are issued by domestic banks and
evidence  ownership  of  securities  issued by  foreign  corporations.  EDRs are
typically  traded in Europe.  GDRs are  typically  traded in both Europe and the
United States.  Depositary Receipts may be issued under sponsored or unsponsored
programs.  In sponsored  programs,  the issuer has made arrangements to have its
securities traded in the form of a Depositary Receipt. In unsponsored  programs,
the  issuers  may not be  directly  involved  in the  creation  of the  program.
Although  regulatory  requirements  with  respect to sponsored  and  unsponsored
Depositary  Receipt  programs are generally  similar,  the issuers of securities
represented  by  unsponsored  Depositary  Receipts are not obligated to disclose
material  information  in the United States,  and therefore,  the import of such
information may not be reflected in the market value of such receipts.  The Fund
may  invest up to 10% of its total  assets in foreign  securities  that it holds
directly,  but this 10% limit does not apply to foreign  securities held through
Depositary Receipts which are traded in the United States or to commercial paper
and certificates of deposit issued by foreign banks.

The Fund may invest up to 10% of its total assets in foreign  securities that it
holds  directly,  but this 10% limit does not apply to foreign  securities  held
through  Depositary  Receipts  which  are  traded  in the  United  States  or to
commercial paper and certificates of deposit issued by foreign banks.

Foreign Currency  Transactions.  A forward foreign currency exchange contract is
an agreement  to purchase or sell a specific  currency at a future date and at a
price set at the time the  contract  is entered  into.  The Fund will  generally
enter into forward foreign  currency  exchange  contracts to fix the U.S. dollar
value of a security it has agreed to buy or sell for the period between the date
the trade was entered into and the date the security is delivered  and paid for,
or, to hedge the U.S. dollar value of securities it owns.


                                       2
<PAGE>


The Fund may  enter  into a  forward  contract  to sell or buy the  amount  of a
foreign  currency it believes may experience a substantial  movement against the
U.S.  dollar.  In this case the contract would  approximate the value of some or
all of the Fund's  portfolio  securities  denominated in such foreign  currency.
Under normal  circumstances,  the portfolio  manager will limit forward currency
contracts  to not greater than 75% of the Fund's  portfolio  position in any one
country as of the date the contract is entered  into.  This  limitation  will be
measured at the point the hedging transaction is entered into by the Fund. Under
extraordinary  circumstances,  the  investment  manager  may enter into  forward
currency  contracts in excess of 75% of the Fund's portfolio position in any one
country as of the date the contract is entered into. The precise matching of the
forward contract amounts and the value of securities involved will not generally
be possible since the future value of such securities in foreign currencies will
change as a consequence of market  involvement in the value of those  securities
between the date the forward  contract is entered  into and the date it matures.
The projection of short-term  currency market  movement is extremely  difficult,
and  the  successful  execution  of a  short-term  hedging  strategy  is  highly
uncertain.  Under  certain  circumstances,  the Fund may commit up to the entire
value  of  its  assets  which  are  denominated  in  foreign  currencies  to the
consummation of these contracts. The investment manager will consider the effect
a substantial  commitment of its assets to forward  contracts  would have on the
investment  program  of  the  Fund  and  its  ability  to  purchase   additional
securities.

Except as set forth above and  immediately  below,  the Fund will also not enter
into such forward  contracts or maintain a net exposure to such contracts  where
the  consummation of the contracts would oblige the Fund to deliver an amount of
foreign  currency in excess of the value of the Fund's  portfolio  securities or
other assets  denominated in that  currency.  The Fund, in order to avoid excess
transactions and transaction  costs, may nonetheless  maintain a net exposure to
forward  contracts in excess of the value of the Fund's portfolio  securities or
other  assets  denominated  in that  currency  provided  the  excess  amount  is
"covered" by cash or liquid,  high-grade  debt  securities,  denominated  in any
currency, at least equal at all times to the amount of such excess. Under normal
circumstances,  consideration  of the  prospect  for  currency  parties  will be
incorporated  into the longer  term  investment  decisions  made with  regard to
overall  diversification  strategies.  However,  the investment manager believes
that it is  important  to have  the  flexibility  to  enter  into  such  forward
contracts when it determines that the best interests of the Fund will be served.

At the maturity of a forward  contract,  the Fund may either sell the  portfolio
security  and make  delivery  of the  foreign  currency,  or it may  retain  the
security  and  terminate  its  contractual  obligation  to deliver  the  foreign
currency by purchasing an "offsetting"  contract  obligating it to purchase,  on
the same maturity date, the same amount of the foreign currency.

As indicated  above,  it is impossible  to forecast with absolute  precision the
market value of portfolio  securities at the expiration of the forward contract.
Accordingly,  it may be necessary  for the Fund to purchase  additional  foreign
currency  on the spot  market  (and bear the  expense of such  purchase)  if the
market  value of the  security is less than the amount of foreign  currency  the
Fund is  obligated to deliver and if a decision is made to sell the security and
make delivery of the foreign currency.  Conversely,  it may be necessary to sell
on the spot market some of the foreign  currency  received  upon the sale of the
portfolio  security if its market value  exceeds the amount of foreign  currency
the Fund is obligated to deliver.  However, the Fund may use liquid,  high-grade
debt securities,  denominated in any currency,  to cover the amount by which the
value of a forward  contract  exceeds  the value of the  securities  to which it
relates.

If  the  Fund  retains  the   portfolio   security  and  engages  in  offsetting
transactions,  the Fund will incur a gain or a loss (as described  below) to the
extent that there has been  movement  in forward  contract  prices.  If the Fund
engages  in an  offsetting  transaction,  it may  subsequently  enter into a new
forward  contract to sell the foreign  currency.  Should  forward prices decline
during the period  between the Fund's  entering into a forward  contract for the
sale of a foreign  currency and the date it enters into an  offsetting  contract
for the  purchase of the foreign  currency,  the Fund will realize a gain to the
extent the price of the  currency it has agreed to sell exceeds the price of the
currency it has agreed to purchase. Should forward


                                       3
<PAGE>


prices  increase,  the Fund will  suffer a loss to the  extent  the price of the
currency  it has agreed to  purchase  exceeds  the price of the  currency it has
agreed to sell.

The Fund's  dealing in  forward  foreign  currency  exchange  contracts  will be
limited to the transactions described above. Of course, the Fund is not required
to enter into forward contracts with regard to its foreign  currency-denominated
securities  and will  not do so  unless  deemed  appropriate  by the  investment
manager.  It also  should be  realized  that this  method of  hedging  against a
decline  in the  value of a  currency  does not  eliminate  fluctuations  in the
underlying prices of the securities. It simply establishes a rate of exchange at
a future date.  Additionally,  although such contracts tend to minimize the risk
of loss due to a decline  in the value of a hedged  currency,  at the same time,
they tend to limit any potential gain which might result from an increase in the
value of that currency.

Shareholders  should  be aware of the  costs of  currency  conversion.  Although
foreign exchange  dealers do not charge a fee for conversion,  they do realize a
profit based on the difference  (the "spread")  between the prices at which they
are buying and selling  various  currencies.  Thus, a dealer may offer to sell a
foreign  currency  to the Fund at one  rate,  while  offering  a lesser  rate of
exchange should the Fund desire to resell that currency to the dealer.

Investment income received by the Fund from sources within foreign countries may
be subject to foreign income taxes withheld at the source. The United States has
entered into tax treaties with many foreign  countries which entitle the Fund to
a reduced  rate of such  taxes or  exemption  from taxes on such  income.  It is
impossible to determine  the effective  rate of foreign tax in advance since the
amounts of the Fund's  assets to be invested  within  various  countries  is not
known.

Repurchase  Agreements.  The Fund may  enter  into  repurchase  agreements  with
commercial  banks and  broker/dealers  as a short-term cash  management  tool. A
repurchase  agreement is an agreement  under which the Fund acquires a security,
generally a US Government obligation,  subject to resale at an agreed upon price
and date.  The resale price  reflects an agreed upon interest rate effective for
the period of time the Fund holds the  security and is unrelated to the interest
rate on the  security.  The Fund's  repurchase  agreements  will at all times be
fully collateralized.

Repurchase  agreements could involve certain risks in the event of bankruptcy or
other  default  by  the  seller,  including  possible  delays  and  expenses  in
liquidating the securities  underlying the agreement,  a decline in value of the
underlying  securities  and  a  loss  of  interest.  Repurchase  agreements  are
typically  entered into for periods of one week or less. The Fund will not enter
into repurchase  agreements of more than one week's duration if more than 10% of
its net assets would be invested in such agreements.

Illiquid Securities. The Fund may invest up to 15% of its net assets in illiquid
securities,  including  restricted  securities  (i.e.,  securities  not  readily
marketable  without  registration  under the  Securities  Act of 1933 (the "1933
Act"))  and  other  securities  that are not  readily  marketable.  The Fund may
purchase  restricted  securities  that can be  offered  and  sold to  "qualified
institutional  buyers"  under Rule 144A of the 1933 Act, and the Fund's Board of
Directors, may determine,  when appropriate,  that specific Rule 144A securities
are liquid and not subject to the 15% limitation on illiquid securities.  Should
the Board of Directors make this  determination,  it will carefully  monitor the
security  (focusing  on such  factors,  among  others,  as trading  activity and
availability of information) to determine that the Rule 144A security  continues
to be liquid.  It is not  possible  to predict  with  assurance  exactly how the
market for Rule 144A securities will further  evolve.  This investment  practice
could have the effect of increasing the level of illiquidity in the Fund, if and
to the extent that qualified institutional buyers become for a time uninterested
in purchasing Rule 144A securities.

Borrowing.  The Fund may borrow money only from banks and only for  temporary or
emergency  purposes  in an amount  not to  exceed  15% of the value of its total
assets.  The Fund may pledge its assets only to the extent  necessary  to effect
permitted borrowing on a secured basis.


                                       4
<PAGE>


Rights and  Warrants.  The Fund may invest in common  stock  rights and warrants
believed   by  the   investment   manager   to  provide   capital   appreciation
opportunities.  Common stock  rights and warrants  received as part of a unit or
attached to  securities  purchased  (i.e.,  not  separately  purchased)  are not
included in the Fund's investment restrictions regarding such securities.

The Fund may not invest in rights and warrants  if, at the time of  acquisition,
the  investment in rights and warrants would exceed 5% of the Fund's net assets,
valued  at the  lower of cost or  market.  In  addition,  no more than 2% of net
assets may be invested in warrants not listed on the New York or American  Stock
Exchanges. For purposes of this restriction, rights and warrants acquired by the
Fund in units or attached  to  securities  may be deemed to have been  purchased
without cost.

Lending of  Portfolio  Securities.  The Fund may lend  portfolio  securities  to
broker/dealers or other  institutions,  if the investment  manager believes such
loans will be beneficial  to the Fund.  The borrower must maintain with the Fund
cash or equivalent  collateral equal to at least 100% of the market value of the
securities  loaned.  During  the time  portfolio  securities  are on  loan,  the
borrower pays the Fund an amount equivalent to any dividends or interest paid on
the securities. The Fund may invest the collateral and earn additional income or
receive an agreed upon amount of interest  income from the borrower.  Loans made
by the Fund will  generally be  short-term.  Loans are subject to termination at
the  option  of  the  Fund  or  the  borrower.   The  Fund  may  pay  reasonable
administrative  and  custodial  fees  in  connection  with a loan  and may pay a
negotiated  portion of the interest  earned on the collateral to the borrower or
placing broker. The Fund does not have the right to vote securities on loan, but
would  terminate  the loan and regain the right to vote if that were  considered
important with respect to the investment. The Fund may loose money if a borrower
defaults on its obligation to return  securities and the value of the collateral
held by the Fund is insufficient to replace the loaned securities.  In addition,
the Fund in  responsible  for any loss that might result from its  investment of
the borrower's collateral.

Except as otherwise  specifically noted above, the Fund's investment  strategies
are not  fundamental  and the Fund, with the approval of the Board of Directors,
may change such strategies without the vote of shareholders.

Fund Policies

The Fund is subject to fundamental  policies that place  restrictions on certain
types of  investments.  These  policies  cannot be  changed  except by vote of a
majority of the Fund's outstanding voting securities.  Under these policies, the
Fund may not:

- - -    Borrow money,  except for temporary or emergency  purposes in an amount not
     to exceed 15% of the value of its total assets;

- - -    Mortgage or pledge any of its  assets,  except to the extent  necessary  to
     effect  permitted  borrowings  on a secured  basis and except to enter into
     escrow arrangements in connection with the sales of permitted call options.
     The Fund has no present  intention of selling call options,  and will no do
     so without the prior approval of the Fund's Board of Directors;

- - -    Purchase   securities   (other  than  closing  call  options)   except  for
     investment,  buy on  "margin,"  or sell  "short."  The Fund has no  present
     intention  of investing  in these types of  securities,  and will not do so
     without the prior approval of the Fund's Board of Directors;

- - -    Invest more than 5% of the value of its total assets,  at market value,  in
     securities  of any company  which,  with their  predecessors,  have been in
     operation  less  than  three  continuous  years,  provided,  however,  that
     securities  guaranteed by a company that (including  predecessors) has been
     in operation at least three  continuous  years shall be excluded  from this
     calculation;

- - -    Invest more than 5% of its total assets  (taken at market) in securities of
     any  one  issuer,  other  than  the  U.S.   Government,   its  agencies  or
     instrumentalities, buy more than 10% of the outstanding voting


                                       5
<PAGE>


     securities or more than 10% of all the securities of any issuer,  or invest
     to control or manage any company;

- - -    Invest more than 25% of total assets at market value in any one industry;

- - -    Invest  in  securities  issued  by other  investment  companies,  except in
     connection with a merger,  consolidation,  acquisition or reorganization or
     for the  purpose  of  hedging  the Fund's  obligations  under the  Deferred
     Compensation Plan for Directors;

- - -    Purchase or hold any real estate,  except the Fund may invest in securities
     secured by real estate or interests therein or issued by persons (including
     real  estate  investment  trusts)  which deal in real  estate or  interests
     therein;

- - -    Purchase  or  hold  the  securities  of any  issuer,  if to its  knowledge,
     directors or officers of the Fund  individually  owning  beneficially  more
     than 0.5% of the securities of that other company own in the aggregate more
     than 5% of such securities;

- - -    Deal with its directors or officers,  or firms they are associated with, in
     the purchase or sale of securities of other issuers, except as broker;

- - -    Purchase or sell commodities and commodity contracts;

- - -    Underwrite the securities of other issuers,  except insofar as the Fund may
     be deemed an underwriter  under the Securities Act of 1933, as amended,  in
     disposing of a portfolio security;

- - -    Make loans,  except loans of portfolio  securities and except to the extent
     the purchase of notes, bonds or other evidences of indebtedness,  the entry
     into repurchase  agreements or deposits with banks may be considered loans;
     or

- - -    Write or purchase put,  call,  straddle or spread  options  except that the
     Fund may sell covered call options listed on a national securities exchange
     or quoted on NASDAQ and purchase  closing call options so listed or quoted.
     The  Fund  has no  present  intention  of  entering  into  these  types  of
     transactions,  and will not do so without the prior  approval of the Fund's
     Board of Directors.

The Fund  also may not  change  its  investment  objective  without  shareholder
approval.

Under the  Investment  Company Act of 1940 (1940 Act),  a "vote of a majority of
the outstanding voting securities" of the Fund means the affirmative vote of the
lesser of (l) more than 50% of the outstanding shares of the Fund; or (2) 67% or
more of the shares  present at a  shareholders'  meeting if more than 50% of the
outstanding shares are represented at the meeting in person or by proxy.

Temporary Defensive Position

When the investment  manager believes that market conditions warrant a temporary
defensive  position,  the Fund may invest up to 100% of its assets in short-term
instruments,  including,  but not  limited  to,  prime  commercial  paper,  bank
certificates of deposit, bankers' acceptances, or repurchase agreements for such
securities,   and   securities  of  the  US  Government  and  its  agencies  and
instrumentalities,  as well as cash and cash equivalents  denominated in foreign
currencies.  The Fund's  investments in foreign  short-term  instruments will be
limited  to  those  that,  in the  opinion  of the  investment  manager,  equate
generally  to  the  standards   established   for  US  short-term   instruments.
Investments in bank obligations will be limited at the time of investment to the
obligations  of the 100  largest  domestic  banks in terms of  assets  which are
subject to regulatory supervision by the US Government or state governments, and
the  obligations  of the 100  largest  foreign  banks in terms  of  assets  with
branches or agencies in the United States.


                                       6
<PAGE>


Portfolio Turnover

The Fund's  portfolio  turnover  rate is  calculated  by dividing  the lesser of
purchases or sales of portfolio  securities for the year by the monthly  average
of the value of the portfolio securities owned during the year. Securities whose
maturity or expiration date at the time of acquisition were one year or less are
excluded from the calculation. The Fund's portfolio turnover rates for the years
ended December 31, 1998 and 1997 were __% and 106.02%, respectively.

                             Management of the Fund

Board of Directors

The Board of Directors provides broad supervision over the affairs of the Fund.

Management Information

Directors  and  officers  of the Fund,  together  with  information  as to their
principal business  occupations during the past five years are shown below. Each
Director who is an "interested  person" of the Fund, as defined in the 1940 Act,
is indicated by an asterisk. Unless otherwise indicated, their addresses are 100
Park Avenue, New York, NY 10017.

<TABLE>
<CAPTION>
            Name,                                                                 Principal
         (Age) and                  Positions(s) Held                        Occupation(s) During
          Address                      with Fund                                 Past 5 Years
          --------                  -----------------                        --------------------
      <S>                        <C>                             <C>  
      William C. Morris*         Director, Chairman of the       Chairman,  J.  & W.  Seligman  &  Co.  Incorporated,
             (60)                Board, Chief Executive          Chairman and Chief Executive  Officer,  the Seligman
                                 Officer and Chairman of the     Group of investment  companies;  Chairman,  Seligman
                                 Executive Committee             Advisors,  Inc, Seligman  Services,  Inc., and Carbo
                                                                 Ceramics  Inc.,  ceramic  proppants  for oil and gas
                                                                 industry;  Director, Seligman Data Corp., Kerr-McGee
                                                                 Corporation,  diversified energy company;  and Sarah
                                                                 Lawrence  College;  and a  Member  of the  Board  of
                                                                 Governors  of  the  Investment   Company  Institute.
                                                                 Formerly,    Director,   Daniel   Industries   Inc.,
                                                                 manufacturer of oil and gas metering equipment.     


       Brian T. Zino*           Director, President and          Director  and  President,  J.  & W.  Seligman  & Co.
             (46)                Member of the Executive         Incorporated;   President  (with  the  exception  of
                                 Committee                       Seligman  Quality  Municipal Fund, Inc. and Seligman
                                                                 Select   Municipal  Fund,   Inc.)  and  Director  or
                                                                 Trustee, the Seligman Group of investment companies;
                                                                 Chairman,  Seligman Data Corp.; Director, ICI Mutual
                                                                 Insurance  Company;  Seligman  Advisors,  Inc.,  and
                                                                 Seligman Services, Inc.                             
</TABLE>                                                         

                                       7
<PAGE>

<TABLE>
<CAPTION>
          Name,                                                              Principal
       (Age) and                    Positions(s) Held                   Occupation(s) During
         Address                        with Fund                           Past 5 Years
     ---------------                -----------------                   --------------------
     <S>                         <C>                             <C>    
     Richard R. Schmaltz*        Director and Member of the      Director   and   Managing   Director,   Director  of
           (58)                  Executive Committee             Investments,  J. & W.  Seligman & Co.  Incorporated;
                                                                 Director  or   Trustee,   the   Seligman   Group  of
                                                                 investment companies;  Director,  Seligman Henderson
                                                                 Co.,   and  Trustee   Emeritus  of  Colby   College.
                                                                 Formerly, Director, Investment Research at Neuberger
                                                                 & Berman from May 1993 to September 1996.           

      John R. Galvin             Director                        Dean,  Fletcher School of Law and Diplomacy at Tufts
           (69)                                                  University;  Director or Trustee, the Seligman Group
     Tufts University                                            of investment companies;  Chairman, American Council
      Packard Avenue,                                            on Germany;  a Governor  of the Center for  Creative
     Medford, MA 02155                                           Leadership;  Director;  Raytheon  Co.,  electronics;
                                                                 National Defense  University;  and the Institute for
                                                                 Defense   Analysis.   Formerly,   Director,   USLIFE
                                                                 Corporation;  Ambassador,  U.S. State Department for
                                                                 negotiations in Bosnia; Distinguished Policy Analyst
                                                                 at Ohio  State  University  and  Olin  Distinguished
                                                                 Professor of National Security Studies at the United
                                                                 States  Military  Academy.  From  June  1987 to June
                                                                 1992, he was the Supreme  Allied  Commander,  Europe
                                                                 and the  Commander-in-Chief,  United States European
                                                                 Command.                                            

     Alice S. Ilchman            Director                        Retired President,  Sarah Lawrence College; Director
          (63)                                                   or  Trustee,   the  Seligman   Group  of  investment
    18 Highland Circle                                           companies;  Director,  the  Committee  for  Economic
    Bronxville, NY 10708                                         Development;    and   Chairman,    The   Rockefeller
                                                                 Foundation,    charitable   foundation.    Formerly,
                                                                 Trustee,   The  Markle   Foundation,   philanthropic
                                                                 organization;   and   Director,   NYNEX,   telephone
                                                                 company;  and  International  Research  and Exchange
                                                                 Board, intellectual exchanges.                      
</TABLE>                                                         

                                       8
<PAGE>


<TABLE>
<CAPTION>
           Name,                                                                Principal
         (Age) and                     Positions(s) Held                   Occupation(s) During
          Address                          with Fund                           Past 5 Years
       ---------------                 ------------------                  -------------------- 
   <S>                                    <C>                    <C>    
      Frank A. McPherson                  Director               Retired Chairman and Chief Executive Officer of
            (65)                                                 Kerr-McGee Corporation; Director or Trustee, the
   2601 Northwest Expressway,                                    Seligman Group of investment companies; Director,
          Suite 805E                                             Kimberly-Clark Corporation, consumer products;
    Oklahoma City, OK 73112                                      Bankof Oklahoma Holding Company; Baptist
                                                                 Medical Center; Oklahoma Chapter of the Nature
                                                                 Conservancy; Oklahoma Medical Research
                                                                 Foundation; and National Boys and Girls Clubs of
                                                                 America; and Member of the Business Roundtable 
                                                                 and National Petroleum Council.  Formerly,
                                                                 Chairman, Oklahoma City Public Schools
                                                                 Foundation; and Director, Federal Reserve System's
                                                                 Kansas City Reserve Bank and the Oklahoma City
                                                                 Chamber of Commerce.

       John E. Merow                      Director               Retired Chairman and Senior Partner, Sullivan &
           (69)                                                  Cromwell, law firm; Director or Trustee, the 
     125 Broad Street,                                           Seligman Group of investment companies;  Director, 
      New York, NY 10004                                         Commonwealth Industries, Inc., manufacturers of              
                                                                 aluminum sheet products; the Foreign  Policy
                                                                 Association; Municipal Art Society of New York; 
                                                                 the U.S. Council for International Business; and
                                                                 New York Presbyterian Hospital; Chairman,
                                                                 American Australian Association; and  New York
                                                                 Presbyterian Healthcare Network,  Inc.; Vice-
                                                                 Chairman, the U.S.- New Zealand Council; and
                                                                 Member of the  American Law Institute and Council
                                                                 on Foreign Relations.

        Betsy S. Michel                   Director               Attorney; Director or Trustee, the Seligman Group of
            (56)                                                 investment companies; Trustee, The Geraldine R. Dodge
        P.O. Box 449                                             Foundation, charitable foundation; and Chairman of
      Gladstone, NJ 07934                                        the Board of Trustees of St. George's School
                                                                 (Newport, RI). Formerly, Director, the National
                                                                 Association of Independent Schools (Washington, DC).

        James C. Pitney                   Director               Retired Partner, Pitney, Hardin, Kipp & Szuch, law
             (72)                                                firm; Director or Trustee, the Seligman Group of
    Park Avenue at Morris County,                                investment companies. Formerly, Director, Public
    P.O. Box 1945, Morristown, NJ                                Service Enterprise Group, public utility.
            07962
</TABLE>


                                        9
<PAGE>


<TABLE>
<CAPTION>
             Name,                                                                     Principal
           (Age) and                   Positions(s) Held                          Occupation(s) During
            Address                        With Fund                                  Past 5 Years
        -------------                  -----------------                          --------------------

<S>                                <C>                           <C>
       James Q. Riordan                     Director             Director  or   Trustee,   the   Seligman   Group  of
             (71)                                                investment   companies;    Director,   The   Houston
       675 Third Avenue,                                         Exploration  Company;  The Brooklyn Museum,  KeySpan
          Suite 3004                                             Energy Corporation; and Public Broadcasting Service;
      New York, NY 10017                                         and Trustee, the Committee for Economic Development.
                                                                 Formerly,  Co-Chairman  of the Policy Council of the
                                                                 Tax   Foundation;    Director,    Tesoro   Petroleum
                                                                 Companies,  Inc.  and  Dow  Jones &  Company,  Inc.;
                                                                 Director and  President,  Bekaert  Corporation;  and
                                                                 Co-Chairman, Mobil Corporation.                     
                                                                 
       Robert L. Shafer                     Director             Retired Vice  President,  Pfizer  Inc.;  Director or
             (66)                                                Trustee, the Seligman Group of investment companies.
     96 Evergreen Avenue,                                        Formerly, Director, USLIFE Corporation.             
         Rye, NY 10580                                           

       James N. Whitson                     Director             Director and Consultant,  Sammons Enterprises, Inc.;
             (63)                                                Director  or   Trustee,   the   Seligman   Group  of   
    6606 Forestshire Drive                                       investment  companies;  C-SPAN; and CommScope,  Inc.   
       Dallas, TX 75230                                          manufacturer of coaxial cables. Formerly,  Executive   
                                                                 Vice  President,  Chief Operating  Officer,  Sammons   
                                                                 Enterprises,  Inc.;  and Director,  Red Man Pipe and   
                                                                 Supply Company, piping and other materials.         

     Charles C. Smith, Jr.        Vice President and Portfolio   Managing Director  (formerly,  Senior Vice President 
              (41)                          Manager              and Senior Investment  Officer),  J. & W. Seligman & 
                                                                 Co.  Incorporated;   Vice  President  and  Portfolio 
                                                                 Manager,  two other open-end investment companies in 
                                                                 the Seligman Group and Tri-Continental  Corporation, 
                                                                 closed-end investment company.                       
                                                                 
       Lawrence P. Vogel                 Vice President          Senior Vice President,  Finance,  J. & W. Seligman &
             (42)                                                Co.  Incorporated,   Seligman  Advisors,  Inc.,  and
                                                                 Seligman Data Corp.;  Vice  President,  the Seligman
                                                                 Group  of   investment   companies,   and   Seligman
                                                                 Services,  Inc.; and Treasurer,  Seligman  Henderson
                                                                 Co.                                                 
                                                                 
        Frank J. Nasta                     Secretary             General  Counsel,  Senior  Vice  President,  Law and
             (34)                                                Regulation and Corporate Secretary, J. & W. Seligman
                                                                 & Co. Incorporated; Secretary, the Seligman Group of
                                                                 investment  companies,   Seligman  Advisors,   Inc.,
                                                                 Seligman Henderson Co., Seligman Services, Inc., and
                                                                 Seligman Data Corp.                                 
                                                                 
         Thomas G. Rose                    Treasurer             Treasurer,   the   Seligman   Group  of   investment
              (41)                                               companies and Seligman Data Corp.                   
</TABLE>                                                         

                                       10
<PAGE>


     The Executive Committee of the Board acts on behalf of the Board between
meetings to determine the value of securities and assets owned by the Fund for
which no market valuation is available, and to elect or appoint officers of the
Fund to serve until the next meeting of the Board.

Directors  and officers of the Fund are also  directors  and officers of some or
all of the other investment companies in the Seligman Group.

Compensation

<TABLE>
<CAPTION>
                                                                          Pension or             Total Compensation
                                                       Aggregate       Retirement Benefits          from Fund and
            Name and                                 Compensation      Accrued as Part of         Fund Complex Paid
       Position with Fund                            from Fund (1)       Fund Expenses           to Directors (1)(2)
       ------------------                            -------------       -------------           -------------------

<S>                                                   <C>                    <C>                     <C>    
William C. Morris, Director and Chairman                 N/A                 N/A                         N/A
Brian T. Zino, Director and President                    N/A                 N/A                         N/A
Richard R. Schmaltz, Director                            N/A                 N/A                         N/A
John R. Galvin, Director                              $1,844                 N/A                     $79,000
Alice S. Ilchman, Director                             1,783                 N/A                      73,000
Frank A. McPherson, Director                           1,844                 N/A                      79,000
John E. Merow, Director                                1,824                 N/A                      77,000
Betsy S. Michel, Director                              1,844                 N/A                      79,000
James C. Pitney, Director                              1,803                 N/A                      75,000
James Q. Riordan, Director                             1,803                 N/A                      75,000
Robert L. Shafer, Director                             1,804                 N/A                      75,000
James N. Whitson, Director                             1,844(d)              N/A                      79,000(d)
</TABLE>
- - --------------
(1)  For the Fund's year ended December 31, 1998. Effective January 16, 1998,
     the per meeting fee for Directors was increased by $1,000, which is
     allocated among all Funds in the Fund Complex.

(2)  The Seligman Group of investment companies consists of eighteen investment
     companies.

(d)  Deferred.

The Fund has a compensation  arrangement under which outside directors may elect
to defer receiving their fees. The Fund has adopted a Deferred Compensation Plan
under which a director who has elected  deferral of his or her fees may choose a
rate of return  equal to either (1) the  interest  rate on  short-term  Treasury
bills,  or (2)  the  rate  of  return  on the  shares  of any of the  investment
companies advised by J. & W. Seligman & Co.  Incorporated,  as designated by the
director.  The cost of such fees and earnings is included in directors' fees and
expenses,  and the accumulated  balance thereof is included in other liabilities
in the Fund's financial  statements.  The total amount of deferred  compensation
(including  earnings)  payable  in  respect  of the  Fund to Mr.  Whitson  as of
December 31, 1998 was $22,019.  Messrs. Merow and Pitney no longer defer current
compensation; however, they have accrued deferred compensation in the amounts of
$87,980 and $67,834, respectively, as of December 31, 1998.

The Fund  may,  but is not  obligated  to,  purchase  shares of  Seligman  Group
investment  companies to hedge its  obligations  in  connection  with the Fund's
Deferred Compensation Plan.

Sales Charges

Class A shares of the Fund may be issued  without a sales  charge to present and
retired directors,  trustees,  officers, employees (and their family members) of
the Fund,  the other  investment  companies in the Seligman  Group,  and J. & W.
Seligman & Co.  Incorporated  and its affiliates.  Family members are defined to
include lineal descendants and lineal ancestors, siblings (and their spouses and
children) and any company or  organization  controlled by any of the  foregoing.
Such sales may also be made to employee  benefit plans and thrift plans for such
persons and to any  investment  advisory,  custodial,  trust or other  fiduciary
account  managed  or  advised  by J. & W.  Seligman  & Co.  Incorporated  or any
affiliate. The sales may be made for investment purposes only, and shares may be
resold only to the Fund.


                                       11
<PAGE>


Class A shares may be sold at net asset value to these  persons since such sales
require  less sales  effort and lower sales  related  expenses as compared  with
sales to the general public.

               Control Persons and Principal Holders of Securities

Control Persons

As of January 31, 1999,  there was no person or persons who controlled the Fund,
either through a significant ownership of shares or any other means of control.

Principal Holders

As of  January  31,  1999,  20.07%  of the  Fund's  Class B capital  stock  then
outstanding,  and 16.67% of the Fund's Class D capital  stock then  outstanding,
were owned of record by Merrill Lynch Pierce Fenner & Smith for the Sole Benefit
of Its  Customers,  Attn.  Fund  Administrator,  4800 Deer Lake Drive East,  3rd
Floor, Jacksonville, FL 32246.

Management Ownership

Directors  and  officers of the Fund as a group owned less than 1% of the Fund's
Class A capital  stock as of January 31, 1999. As of the same date, no Directors
or officers owned shares of the Fund's Class B or Class D capital stock.

                     Investment Advisory and Other Services

Investment Manager

J. & W. Seligman & Co.  Incorporated  (Seligman) manages the Fund. Seligman is a
successor  firm to an  investment  banking  business  founded  in 1864 which has
thereafter provided investment services to individuals,  families, institutions,
and  corporations.  On December 29, 1988, a majority of the  outstanding  voting
securities of Seligman was purchased by Mr. William C. Morris and a simultaneous
recapitalization  of Seligman  occurred.  See  Appendix  for further  history of
Seligman.

All of the  officers  of the Fund listed  above are  officers  or  employees  of
Seligman.  Their affiliations with the Fund and with Seligman are provided under
their principal business occupations.

The Fund pays Seligman a management fee for its services,  calculated  daily and
payable  monthly.  The  management  fee is equal to .65% per annum of the Fund's
average  daily net  assets on the first $1  billion  of net  assets and .60% per
annum of the  Fund's  average  daily net  assets on the next $1  billion  of net
assets and,  .55% per annum of the Fund's  average daily net assets in excess of
$2 billion.  For the year ended  December 31, 1998, the Fund paid Seligman $___,
equal to __% per annum of its  average  daily  net  assets.  For the year  ended
December 31, 1997, the Fund paid Seligman $5,192,858, equal to .65% per annum of
its average daily net assets, and for the year ended December 31, 1996, the Fund
paid  Seligman  $4,516,946  equal to .65% per  annum of its  average  daily  net
assets.  Seligman paid fees to Seligman Henderson Co., pursuant to a subadvisory
agreement,  of $430,725 and  $367,285 for the years ended  December 31, 1997 and
1996, respectively. On March 30, 1998, the subadvisory agreement was terminated.
For the period  January 1, 1998 through  March 30, 1998,  Seligman  paid fees to
Seligman Henderson Co. of $___.

The Fund  pays  all of its  expenses  other  than  those  assumed  by  Seligman,
including  brokerage  commissions,  administration,   shareholder  services  and
distribution  fees,  fees and expenses of  independent  attorneys  and auditors,
taxes and governmental fees,  including fees and expenses of qualifying the Fund
and  its  shares  under  Federal  and  State  securities  laws,  cost  of  stock
certificates  and expenses of repurchase  or  redemption of shares,  expenses of
printing and distributing reports, notices and proxy



                                       12
<PAGE>


materials to  shareholders,  expenses of printing  and filing  reports and other
documents  with  governmental  agencies,  expenses  of  shareholders'  meetings,
expenses of corporate data processing and related services,  shareholder  record
keeping and shareholder  account  services,  fees and  disbursements of transfer
agents and custodians, expenses of disbursing dividends and distributions,  fees
and  expenses of  directors of the Fund not employed by or serving as a Director
of the Manager or its affiliates,  insurance premiums and extraordinary expenses
such as litigation expenses.

The Management  Agreement  provides that Seligman will not be liable to the Fund
for any error of judgment or mistake of law, or for any loss  arising out of any
investment,  or for any act or  omission  in  performing  its  duties  under the
Agreement,  except for willful  misfeasance,  bad faith,  gross  negligence,  or
reckless disregard of its obligations and duties under the Agreement.

The Management  Agreement was initially  approved by the Board of Directors at a
Meeting held on September 30, 1988 and by the  shareholders at a special meeting
held on December 16, 1988.  Amendments to the  Management  Agreement,  effective
April 10,  1991,  to increase  the fee rate  payable to the Manager by the Fund,
were  approved  by the  Board  of  Directors  on  January  17,  1991  and by the
shareholders  at a special meeting held on April 10, 1991. The amendments to the
Management  Agreement,  effective  January 1,  1996,  to  increase  the fee rate
payable  to the  Manager  by the  Fund  were  approved  by the  Fund's  Board of
Directors on September 21, 1995 and by the  shareholders at a special meeting on
December  12,  1995.  The  Management  Agreement  will  continue in effect until
December  31 of each year if (1) such  continuance  is  approved  in the  manner
required  by the  1940  Act  (i.e.,  by a vote of a  majority  of the  Board  of
Directors or of the outstanding voting securities of the Fund and by a vote of a
majority of the  Directors  who are not parties to the  Management  Agreement or
interested  persons of any such party) and (2) Seligman  shall not have notified
the Fund at least 60 days  prior  to  December  31 of any year  that it does not
desire such continuance.  The Management Agreement may be terminated by the Fund
or by Seligman, without penalty, on 60 days' written notice to Seligman and will
terminate  automatically in the event of its assignment.  The Fund has agreed to
change its name upon termination of the Management Agreement if continued use of
the name would cause confusion in the context of Seligman's business.

Officers,  directors  and  employees  of  Seligman  are  permitted  to engage in
personal securities transactions, subject to Seligman's Code of Ethics. The Code
of Ethics  proscribes  certain  practices  with  regard to  personal  securities
transactions and personal  dealings,  provides a framework for the reporting and
monitoring of personal securities transactions by Seligman's Compliance Officer,
and sets forth a  procedure  of  identifying,  for  disciplinary  action,  those
individuals who violate the Code of Ethics. The Code of Ethics prohibits each of
the  officers,  directors and employees  (including  all portfolio  managers) of
Seligman from purchasing or selling any security that the officer,  director, or
employee knows or believes (1) was  recommended by Seligman for purchase or sale
by any client,  including the Fund, within the preceding two weeks, (2) has been
reviewed by Seligman  for  possible  purchase or sale within the  preceding  two
weeks, (3) is being purchased or sold by any client,  (4) is being considered by
a research analyst,  (5) is being acquired in a private placement,  unless prior
approval has been obtained from Seligman's  Compliance  Officer, or (6) is being
acquired during an initial or secondary public offering. The Code of Ethics also
imposes a strict standard of confidentiality  and requires portfolio managers to
disclose  any  interest  they may have in the  securities  or issuers  that they
recommend for purchase by any client.

The Code of Ethics also  prohibits  (1) each  portfolio  manager or member of an
investment  team from  purchasing or selling any security  within seven calendar
days of the  purchase or sale of the security by a client's  account  (including
investment  company accounts) for which the portfolio manager or investment team
manages;  and (2) each employee from engaging in short-term  trading (a purchase
and sale or vice-versa  within 60 days). Any profit realized  pursuant to either
of these prohibitions must be disgorged.

Officers,  directors,  and  employees  are  required,  except under very limited
circumstances,  to engage in personal securities transactions through Seligman's
order  desk.  The order  desk  maintains  a list of  securities  that may not be
purchased due to a possible conflict with clients. All officers, directors and


                                       13
<PAGE>

employees are also  required to disclose all  securities  beneficially  owned by
them on December 31 of each year.

Principal Underwriter

Seligman Advisors,  Inc., (Seligman Advisors) an affiliate of Seligman, 100 Park
Avenue,  New York, New York 10017, acts as general  distributor of the shares of
the Fund and of the other mutual funds in the Seligman Group.  Seligman Advisors
is an  "affiliated  person" (as defined in the 1940 Act) of  Seligman,  which is
itself an affiliated  person of the Fund.  Those  individuals  identified  above
under  "Management  Information"  as  directors or officers of both the Fund and
Seligman Advisors are affiliated persons of both entities.

Services Provided by the Investment Manager

Under the  Management  Agreement,  dated December 29, 1988, as amended April 10,
1991 and  January 1, 1996,  subject  to the  control of the Board of  Directors,
Seligman  manages the  investment  of the assets of the Fund,  including  making
purchases  and  sales  of  portfolio  securities   consistent  with  the  Fund's
investment  objectives  and  policies,  and  administers  its business and other
affairs.  Seligman provides the Fund with such office space,  administrative and
other  services and  executive  and other  personnel as are  necessary  for Fund
operations.  Seligman pays all of the  compensation of directors of the Fund who
are  employees or  consultants  of Seligman and of the officers and employees of
the Fund.  Seligman also provides senior management for Seligman Data Corp., the
Fund's shareholder service agent.

Service Agreements

There are no other management-related service contracts under which services are
provided to the Fund.

Other Investment Advice

No person or persons, other than directors,  officers, or employees of Seligman,
regularly advise the Fund with respect to its investments.

Dealer Reallowances

Dealers and financial  advisors receive a percentage of the initial sales charge
on sales of Class A shares of the Fund, as set forth below:

<TABLE>
<CAPTION>
                                                                                   Regular Dealer
                                    Sales Charge           Sales Charge              Reallowance
                                     As a % of             as a % of Net              As a % of
Amount of Purchase               Offering Price(1)        Amount Invested          Offering Price
- - ------------------               -----------------        ---------------          --------------

<S>                                     <C>                    <C>                      <C>  
Less than  $50,000                      4.75%                  4.99%                    4.25%
$50,000  -  $99,999                     4.00                   4.17                     3.50
$100,000  -  $249,999                   3.50                   3.63                     3.00
$250,000  -  $499,999                   2.50                   2.56                     2.25
$500,000  -  $999,999                   2.00                   2.04                     1.75
$1,000,000  and over(2)                  0                       0                        0
</TABLE>

(1)  "Offering  Price" is the amount that you actually  pay for Fund shares;  it
     includes the initial sales charge.

(2)  You will not pay a sales charge on purchases of $1 million or more, but you
     will be subject to a 1% CDSC if you sell your shares within 18 months.


                                       14
<PAGE>


     Seligman Services, Inc. (Seligman Services), an affiliate of Seligman, is a
limited  purpose  broker/dealer.   Seligman  Services  is  eligible  to  receive
commissions  from  certain  sales of Fund shares.  For years ended  December 31,
1998, 1997, and 1996,  Seligman Services received  commissions in the amounts of
$___, $22,385, and $21,997, respectively.

Rule 12b-1 Plan

The Fund has adopted an  Administration,  Shareholder  Services and Distribution
Plan (12b-1  Plan) in  accordance  with  Section  12(b) of the 1940 Act and Rule
12b-1 thereunder.

Under the 12b-1 Plan, the Fund may pay to Seligman  Advisors an  administration,
shareholder  services  and  distribution  fee in respect of the Fund's  Class A,
Class B, and Class D shares.  Payments under the 12b-1 Plan may include, but are
not limited to: (1) compensation to securities  dealers and other  organizations
(Service  Organizations) for providing  distribution  assistance with respect to
assets  invested in the Fund;  (2)  compensation  to Service  Organizations  for
providing administration, accounting and other shareholder services with respect
to Fund  shareholders;  and (3)  otherwise  promoting  the sale of shares of the
Fund,  including  paying for the preparation of advertising and sales literature
and the printing and distribution of such promotional materials and prospectuses
to  prospective  investors and defraying  Seligman  Advisors'  costs incurred in
connection  with its  marketing  efforts  with  respect  to  shares of the Fund.
Seligman,  in its sole  discretion,  may also make similar  payments to Seligman
Advisors  from its own  resources,  which may  include the  management  fee that
Seligman receives from the Fund.  Payments made by the Fund under the 12b-1 Plan
are intended to be used to encourage sales of the Fund, as well as to discourage
redemptions.

Fees paid by the Fund under the 12b-1  Plan with  respect to any class of shares
may not be used to pay expenses incurred solely in respect of any other class or
any other Seligman  fund.  Expenses  attributable  to more than one class of the
Fund will be  allocated  between the classes in  accordance  with a  methodology
approved by the Fund's Board of Directors.  Expenses of distribution  activities
that benefit both the Fund and other Seligman funds will be allocated  among the
applicable  funds  based on  relative  gross  sales over the prior  quarter,  in
accordance with a methodology approved by the Board.

Class A 

Under the 12b-1 Plan, the Fund,  with respect to Class A shares,  pays quarterly
to  Seligman  Advisors  a  service  fee at an  annual  rate of up to .25% of the
average  daily net asset  value of the  Class A shares.  These  fees are used by
Seligman Advisors  exclusively to make payments to Service  Organizations  which
have entered into agreements with Seligman Advisors.  Such Service Organizations
receive  from  Seligman  Advisors  a  continuing  fee of up to .25% on an annual
basis,  payable  quarterly,  of the  average  daily net assets of Class A shares
attributable  to the  particular  Service  Organization  for providing  personal
service and/or maintenance of shareholder  accounts.  The fee payable to Service
Organizations from time to time shall,  within such limits, be determined by the
Directors of the Fund.  The Fund is not  obligated to pay Seligman  Advisors for
any such  costs it  incurs  in excess of the fee  described  above.  No  expense
incurred in one year by Seligman  Advisors with respect to Class A shares of the
Fund may be paid from  Class A 12b-1  fees  received  from the Fund in any other
year. If the Fund's 12b-1 Plan is  terminated  in respect of Class A shares,  no
amounts (other than amounts  accrued but not yet paid) would be owed by the Fund
to Seligman  Advisors  with respect to Class A shares.  The total amount paid by
the Fund to  Seligman  Advisors  in respect of Class A shares for the year ended
December  31, 1998 was $___,  equivalent  to __% of the Class A shares'  average
daily net assets.

Class B

Under the 12b-1 Plan, the Fund,  with respect to Class B shares,  pays monthly a
12b-1 fee at an annual rate of up to 1% of the average  daily net asset value of
the Class B shares. The fee is comprised of (1) a distribution fee equal to .75%
per annum,  which is paid  directly to a third  party,  FEP  Capital,  L.P.,  to
compensate  it for having  funded,  at the time of sale of Fund  shares (i) a 4%
commission payment to



                                       15
<PAGE>


Service Organizations in connection with the sale of the Class B shares and (ii)
a payment of up to .25% of sales to  Seligman  Advisors to help defray its costs
of  distributing  Class B shares;  and (2) a service fee of up to .25% per annum
which is paid to Seligman Advisors. The service fee is used by Seligman Advisors
exclusively  to make payments to Service  Organizations  which have entered into
agreements  with  Seligman  Advisors.  Such Service  Organizations  receive from
Seligman  Advisors a  continuing  service fee of up to .25% on an annual  basis,
payable  quarterly,   of  the  average  daily  net  assets  of  Class  B  shares
attributable  to the  particular  Service  Organization  for providing  personal
service  and/or  maintenance of shareholder  accounts.  The amounts  expended by
Seligman Advisors or FEP Capital, L.P. in any one year upon the initial purchase
of Class B shares of the Fund may exceed the 12b-1 fees paid by the Fund in that
year.  The Fund's  12b-1 Plan  permits  expenses  incurred in respect of Class B
shares in one year to be paid from Class B 12b-1 fees  received from the Fund in
any other year; however, in any fiscal year the Fund is not obligated to pay any
12b-1 fees in excess of the fees  described  above.  Seligman  Advisors  and FEP
Capital,  L.P. are not  reimbursed  for expenses  which exceed such fees. If the
Fund's 12b-1 Plan is terminated in respect of Class B shares,  no amounts (other
than  amounts  accrued  but not yet paid) would be owed by that Fund to Seligman
Advisors or FEP Capital,  L.P. with respect to Class B shares.  The total amount
paid by the Fund in respect of Class B shares  for the year ended  December  31,
1998 was $___,  equivalent  to __% per annum of the average  daily net assets of
Class B shares.

Class D

Under the 12b-1 Plan, the Fund, with respect to Class D shares,  pays monthly to
Seligman Advisors a 12b-1 fee at an annual rate of up to 1% of the average daily
net asset value of the Class D shares.  The Fee is used by Seligman  Advisors as
follows:  During  the  first  year  following  the  sale of  Class D  shares,  a
distribution fee of .75% of the average daily net assets attributable to Class D
share is used, along with any CDSC proceeds,  to (1) reimburse Seligman Advisors
for its payment at the time of sale of Class D shares of a .75% sales commission
to Service Organizations, and (2) pay for other distribution expenses, including
paying for the preparation of advertising and sales  literature and the printing
and distribution of such  promotional  materials and prospectuses to prospective
investors and other marketing costs of Seligman  Advisors.  In addition,  during
the first year following the sale of Class D shares, a service fee of up to .25%
of the average daily net assets  attributable  to such Class D shares is used to
reimburse  Seligman Advisors for its prepayment to Service  Organizations at the
time of sale of Class D shares of a  service  fee of up to .25% of the net asset
value of the Class D share sold (for  shareholder  services  to be  provided  to
Class D shareholders  over the course of the one year immediately  following the
sale). The payment to Seligman  Advisors is limited to amounts Seligman Advisors
actually  paid to Service  Organizations  at the time of sale as  service  fees.
After the initial one-year period following a sale of Class D shares, the entire
12b-1 fee  attributable to such Class D shares is paid to Service  Organizations
for providing  continuing  shareholder  services and distribution  assistance in
respect of assets  invested  in the Fund.  The total  amount paid by the Fund in
respect  of Class D shares  for the  year  ended  December  31,  1998 was  $___,
equivalent to __% per annum of the average daily net assets of Class D shares.

The amounts expended by Seligman  Advisors in any one year with respect to Class
D shares of the Fund may  exceed  the 12b-1  fees paid by the Fund in that year.
The Fund's 12b-1 Plan permits expenses  incurred by Seligman Advisors in respect
of Class D shares  in one year to be paid from  Class D 12b-1  fees in any other
year;  however,  in any year the Fund is not  obligated to pay any 12b-1 fees in
excess of the fees described above.

As of December 31, 1998  Seligman  Advisors has  incurred  $___ of  unreimbursed
expenses in respect of the Fund's Class D shares. This amount is equal to __% of
the net assets of Class D shares at December 31, 1998.

If the 12b-1 Plan is  terminated  in  respect of Class D shares of the Fund,  no
amounts  (other than amounts  accrued by not yet paid) would be owed by the Fund
to Seligman Advisors with respect to Class D shares.


                                       16
<PAGE>


Payments  made by the Fund  under  the  12b-1  Plan for its  fiscal  year  ended
December 31,  1998,  were spent on the  following  activities  in the  following
amounts:

                                     Class A       Class B      Class D
                                     -------       -------      -------

Compensation to underwriters                       $            $

Compensation to broker/dealers       $             $            $

Other*                                             $

*    Payment is made to FEP Capital, L. P. to compensate it for having funded at
     the time of sale, payments to broker/dealers and underwriters.

The 12b-1 Plan was  approved  on July 16,  1992 by the  Directors,  including  a
majority of the  Directors who are not  "interested  persons" (as defined in the
1940 Act) of the Fund and who have no direct or indirect  financial  interest in
the  operation  of the Plan or in any  agreement  related to the 12b-1 Plan (the
"Qualified Directors") and was approved by shareholders of the Fund at a Special
Meeting of the  Shareholders  held on November 23,  1992.  The 12b-1 Plan became
effective  in respect  of the Class A shares on January 1, 1993.  The 12b-1 Plan
was  approved in respect of the Class B shares on March 21, 1996 by the Board of
Directors  of the Fund,  including a majority of the  Qualified  Directors,  and
became  effective in respect of the Class B shares on April 22, 1996.  The 12b-1
Plan was  approved  in  respect  of the Class D shares on March 18,  1993 by the
Directors, including a majority of the Qualified Directors, and became effective
in respect of the Class D shares on May 1, 1993. The 12b-1 Plan will continue in
effect until  December 31 of each year so long as such  continuance  is approved
annually by a majority  vote of both the Directors of the Fund and the Qualified
Directors,  cast in person at a meeting called for the purpose of voting on such
approval.  The 12b-1 Plan may not be amended to increase  materially the amounts
payable to Service Organizations with respect to a class without the approval of
a majority of the  outstanding  voting  securities  of the class.  If the amount
payable  in respect of Class A shares  under the 12b-1  Plan is  proposed  to be
increased materially,  the Fund will either (1) permit holders of Class B shares
to vote as a separate  class on the  proposed  increase  or (2)  establish a new
class of shares  subject to the same  payment  under the 12b-1 Plan as  existing
Class A shares,  in which case the Class B shares will  thereafter  convert into
the new class instead of into Class A shares. No material amendment to the 12b-1
Plan may be made  except by vote of a  majority  of both the  Directors  and the
Qualified Directors.

The 12b-1 Plan  requires  that the  Treasurer  of the Fund shall  provide to the
Directors,  and the Directors shall review, at least quarterly, a written report
of the amounts expended (and purposes therefor) under the 12b-1 Plan. Rule 12b-1
also  requires  that the  selection  and  nomination  of  Directors  who are not
"interested  persons" of the Fund be made by such disinterested  Directors.  The
12b-1 Plan is reviewed by the Directors annually.

Seligman  Services acts as a broker/dealer  of record for  shareholder  accounts
that do not have a designated  financial advisor and receives  compensation from
the Fund pursuant to the 12b-1 Plan for providing  personal services and account
maintenance  to such  accounts and other  distribution  services.  For the years
ended December 31, 1998, 1997, and 1996, Seligman Services received distribution
and service fees from the Fund pursuant to its 12b-1 Plan of $____, $468,360 and
$448,975, respectively.

                    Brokerage Allocation and Other Practices

Brokerage Transactions

Seligman  will seek the most  favorable  price and execution in the purchase and
sale of portfolio  securities  of the Fund.  When two or more of the  investment
companies in the Seligman Group or other investment advisory clients of Seligman
desire  to buy or sell  the  same  security  at the same  time,  the  securities
purchased or sold are allocated by Seligman in a manner believed to be equitable
to each. There may be



                                       17
<PAGE>


possible  advantages or disadvantages of such transactions with respect to price
or the size of positions readily obtainable or saleable.

In  over-the-counter  markets,  the Fund deals with  responsible  primary market
makers unless a more favorable  execution or price is believed to be obtainable.
The Fund  may buy  securities  from or sell  securities  to  dealers  acting  as
principal,   except  dealers  with  which  its  directors  and/or  officers  are
affiliated.

For the years ended  December  31,  1998,  1997,  and 1996,  the Fund paid total
brokerage commissions to others for execution, research and statistical services
in the amounts of $_______, $2,439,633 and $1,374,513, respectively.

Commissions

For the years ended December 31, 1998,  1997, and 1996, the Fund did not execute
any portfolio  transactions  with, and therefore did not pay any commissions to,
any broker affiliated with either the Fund, Seligman, or Seligman Advisors.

Brokerage Selection

Consistent  with seeking the most  favorable  price and execution when buying or
selling portfolio  securities,  Seligman may give consideration to the research,
statistical,  and other services furnished by brokers or dealers to Seligman for
its use,  as well as the  general  attitude  toward and  support  of  investment
companies  demonstrated  by such  brokers  or  dealers.  Such  services  include
supplemental  investment  research,  analysis,  and reports concerning  issuers,
industries,  and securities  deemed by Seligman to be beneficial to the Fund. In
addition,  Seligman  is  authorized  to place  orders  with  brokers who provide
supplemental  investment and market research and security and economic  analysis
although the use of such brokers may result in a higher  brokerage charge to the
Fund than the use of brokers  selected  solely on the basis of seeking  the most
favorable  price and  execution  and although  such research and analysis may be
useful to Seligman in  connection  with its  services to clients  other than the
Fund.

Directed Brokerage

During the year ended  December 31, 1998 neither the Fund nor Seligman  directed
any of the  Fund's  brokerage  transactions  to a  broker  because  of  research
services provided.

Regular Broker-Dealers

During the year ended December 31, 1998, the Fund did not acquire  securities of
its regular  brokers or dealers (as defined in Rule 10b-1 under the 1940 Act) or
of their parents.

                       Capital Stock and Other Securities

Capital Stock

The Fund is authorized to issue 500,000,000  shares of common stock, each with a
par value of $0.50, divided into three classes, designated Class A, Class B, and
Class D shares.  Each  share of the  Fund's  Class A, Class B and Class D common
stock is equal as to earnings,  assets, and voting privileges,  except that each
class bears its own separate distribution and, potentially,  certain other class
expenses and has  exclusive  voting rights with respect to any matter to which a
separate vote of any class is required by the 1940 Act or Maryland law. The Fund
has  adopted  a  multiclass  plan  pursuant  to Rule  18f-3  under  the 1940 Act
permitting  the  issuance  and sale of  multiple  classes  of common  stock.  In
accordance  with the  Articles  of  Incorporation,  the Board of  Directors  may
authorize  the  creation  of  additional  classes  of  common  stock  with  such
characteristics as are permitted by the multiclass plan and Rule 18f-3. The 1940
Act requires that where more than one class exists, each class must be preferred
over all other



                                       18
<PAGE>


classes in respect of assets  specifically  allocated to such class.  All shares
have noncumulative voting rights for the election of directors. Each outstanding
share is fully paid and non-assessable,  and each is freely transferable.  There
are no liquidation, conversion, or preemptive rights.

Other Securities

The Fund has no authorized securities other than common stock.

                   Purchase, Redemption, and Pricing of Shares

Purchase of Shares

Class A

Class A shares may be  purchased  at a price  equal to the next  determined  net
asset value per share, plus an initial sales charge.

Purchases  of Class A shares by a "single  person"  (as  defined  below)  may be
eligible for the following reductions in initial sales charges:

Volume  Discounts  are provided if the total  amount  being  invested in Class A
shares of the Fund alone,  or in any  combination  of shares of the other mutual
funds in the Seligman Group which are sold with an initial sales charge, reaches
levels indicated in the sales charge schedule set forth in the Prospectus.

The Right of  Accumulation  allows an  investor  to  combine  the  amount  being
invested in Class A shares of the Fund and shares of the other  Seligman  mutual
funds sold with an initial sales charge with the total net asset value of shares
of those mutual funds  already owned that were sold with an initial sales charge
and the total net asset value of shares of Seligman Cash  Management  Fund which
were acquired  through an exchange of shares of another  Seligman mutual fund on
which there was an initial  sales  charge at the time of  purchase to  determine
reduced  sales charges in accordance  with the schedule in the  prospectus.  The
value of the  shares  owned,  including  the value of shares  of  Seligman  Cash
Management  Fund  acquired in an exchange of shares of another  Seligman  mutual
fund on which there was an initial  sales charge at the time of purchase will be
taken into account in orders placed through a dealer,  however, only if Seligman
Advisors  is  notified  by an  investor  or a dealer of the amount  owned by the
investor  at  the  time  the  purchase  is  made  and  is  furnished  sufficient
information to permit confirmation.

A Letter of Intent allows an investor to purchase Class A shares over a 13-month
period at reduced  initial sales charges in accordance  with the schedule in the
Prospectus,  based on the  total  amount  of Class A shares of the Fund that the
letter states the investor intends to purchase plus the total net asset value of
shares that were sold with an initial sales charge of the other Seligman  mutual
funds  already  owned and the total net asset value of shares of  Seligman  Cash
Management  Fund which were  acquired  through an  exchange of shares of another
Seligman  mutual fund on which there was an initial  sales charge at the time of
purchase.  Reduced  sales  charges  also may apply to  purchases  made  within a
13-month  period starting up to 90 days before the date of execution of a letter
of intent.

CDSC Applicable to Class A Shares.  Class A shares purchased  without an initial
sales  charge  in  accordance  with the  sales  charge  schedule  in the  Fund's
Prospectus,  or pursuant to a Volume Discount, Right of Accumulation,  or Letter
of Intent  are  subject to a CDSC of 1% on  redemptions  of such  shares  within
eighteen months of purchase. Employee benefit plans eligible for net asset value
sales (as described  below) may be subject to a CDSC of 1% for  terminations  at
the plan level only, on redemptions of shares  purchased  within eighteen months
prior to plan  termination.  The 1% CDSC  will be  waived  on  shares  that were
purchased   through  Morgan  Stanley  Dean  Witter  &  Co.  by  certain  Chilean
institutional  investors (i.e. pension plans,  insurance  companies,  and mutual
funds). Upon redemption of such shares within an eighteen-month  period,  Morgan
Stanley Dean Witter will reimburse Seligman



                                       19
<PAGE>


Advisors a pro rata portion of the fee it received from Seligman Advisors at the
time of sale of such shares.

See "CDSC  Waivers"  below for other  waivers which may be applicable to Class A
shares.

Persons  Entitled To  Reductions.  Reductions  in initial sales charges apply to
purchases  of Class A shares  by a "single  person,"  including  an  individual;
members of a family  unit  comprising  husband,  wife and minor  children;  or a
trustee or other fiduciary  purchasing for a single fiduciary account.  Employee
benefit plans qualified under Section 401 of the Internal  Revenue Code of 1986,
as amended,  organizations  tax exempt  under  Section  501(c)(3) or (13) of the
Internal  Revenue Code, and  non-qualified  employee  benefit plans that satisfy
uniform criteria are considered  "single persons" for this purpose.  The uniform
criteria are as follows:

     1.  Employees  must  authorize the  employer,  if requested by the Fund, to
receive in bulk and to distribute to each participant on a timely basis the Fund
prospectus, reports, and other shareholder communications.

     2.  Employees  participating  in a plan will be  expected  to make  regular
periodic  investments (at least annually).  A participant who fails to make such
investments  may be dropped  from the plan by the employer or the Fund 12 months
and 30 days after the last regular investment in his account. In such event, the
dropped participant would lose the discount on share purchases to which the plan
might then be entitled.

     3. The employer  must solicit its employees  for  participation  in such an
employee  benefit plan or authorize  and assist an  investment  dealer in making
enrollment solicitations.

Eligible  Employee  Benefit Plans.  The table of sales charges in the Prospectus
applies to sales to "eligible  employee benefit plans," except that the Fund may
sell shares at net asset value to "eligible  employee  benefit plans" which have
at least (1) $500,000  invested in the Seligman  Group of mutual funds or (2) 50
eligible employees to whom such plan is made available.  Such sales must be made
in connection with a payroll  deduction  system of plan funding or other systems
acceptable  to  Seligman  Data  Corp.,  the Fund's  shareholder  service  agent.
"Eligible  employee benefit plan" means any plan or arrangement,  whether or not
tax qualified,  which provides for the purchase of Fund shares.  Sales of shares
to such plans must be made in connection with a payroll deduction system of plan
funding or other system acceptable to Seligman Data Corp.

Such  sales are  believed  to require  limited  sales  effort and  sales-related
expenses and  therefore  are made at net asset value.  Contributions  or account
information for plan  participation  also should be transmitted to Seligman Data
Corp.  by methods  which it  accepts.  Additional  information  about  "eligible
employee  benefit  plans" is  available  from  financial  advisors  or  Seligman
Advisors.

Further  Types of  Reductions.  Class A shares  may also be  issued  without  an
initial sales charge to any registered unit investment trust which is the issuer
of periodic payment plan certificates, the net proceeds of which are invested in
Fund shares;  to separate  accounts  established  and maintained by an insurance
company which are exempt from  registration  under Section  3(c)(11) of the 1940
Act; to registered  representatives  and employees  (and their spouses and minor
children) of any dealer that has a sales  agreement with Seligman  Advisors;  to
financial  institution  trust  departments;  to registered  investment  advisers
exercising  discretionary  investment  authority with respect to the purchase of
Fund shares; to accounts of financial institutions or broker/dealers that charge
account management fees,  provided Seligman or one of its affiliates has entered
into  an  agreement  with  respect  to  such  accounts;  pursuant  to  sponsored
arrangements with organizations  which make  recommendations to, or permit group
solicitations of, its employees,  members or participants in connection with the
purchase of shares of the Fund;  to other  investment  companies in the Seligman
Group in connection with a deferred fee arrangement for outside  directors;  and
to "eligible employee benefit plans" which have at least (1)



                                       20
<PAGE>


$500,000  invested in the Seligman mutual funds or (2) 50 eligible  employees to
whom such plan is made available.

Class B

Class B shares may be  purchased  at a price  equal to the next  determined  net
asset  value,  without  an initial  sales  charge.  However,  Class B shares are
subject to a CDSC if the shares are  redeemed  within six years of  purchase  at
rates set forth in the table below,  charged as a percentage  of the current net
asset value or the original purchase price, whichever is less.

Years Since Purchase                                         CDSC
- - --------------------                                         ----

Less than 1 year ..........................................   5%
1 year or more but less than 2 years ......................   4%
2 years or more but less than 3 years .....................   3%
3 years or more but less than 4 years .....................   3%
4 years or more but less than 5 years .....................   2%
5 years or more but less than 6 years .....................   1%
6 years or more ...........................................   0%

Approximately   eight  years  after  purchase,   Class  B  shares  will  convert
automatically  to Class A shares  which are subject to an annual  service fee of
 .25% but no distribution fee. Shares purchased through reinvestment of dividends
and  distributions on Class B shares also will convert  automatically to Class A
shares along with the  underlying  shares on which they were earned.  Conversion
occurs at the end of the month  which  precedes  the eighth  anniversary  of the
purchase date. If Class B shares of the Fund are exchanged for Class B shares of
another  Seligman Mutual Fund, the conversion  period  applicable to the Class B
shares acquired in the exchange will apply, and the holding period of the shares
exchanged will be tacked onto the holding period of the shares acquired. Class B
shareholders of the Fund  exercising the exchange  privilege will continue to be
subject to the Fund's CDSC  schedule  if such  schedule is higher or longer than
the CDSC  schedule  relating  to the new Class B shares.  In  addition,  Class B
shares of the Fund  acquired  by  exchange  will be subject  to the Fund's  CDSC
schedule if such schedule is higher or longer than the CDSC schedule relating to
the Class B shares of the fund from which the exchange has been made.

Class D

Class D shares may be  purchased  at a price  equal to the next  determined  net
asset  value,  without  an initial  sales  charge.  However,  Class D shares are
subject to a CDSC of 1% if the shares are redeemed  within one year of purchase,
charged as a percentage of the current net asset value or the original  purchase
price, whichever is less.

Systematic Withdrawals. Class B and Class D shareholders who reinvest both their
dividends and capital gain  distributions to purchase  additional  shares of the
Fund, may use the Fund's  Systematic  Withdrawal  Plan to withdraw up to 12% and
10%,  respectively,  of the  value  of  their  accounts  per  year  without  the
imposition of a CDSC.  Account value is determined as of the date the systematic
withdrawals begin.

CDSC  Waivers.  The CDSC on  Class B and  Class D shares  (and  certain  Class A
shares,  as  discussed  above)  will  be  waived  or  reduced  in the  following
instances:

(1)  on  redemptions  following the death or  disability  (as defined in Section
     72(m)(7) of the  Internal  Revenue  Code) of a  shareholder  or  beneficial
     owner;

(2)  in connection with (1) distributions  from retirement plans qualified under
     Section  401(a) of the  Internal  Revenue  Code when such  redemptions  are
     necessary to make distributions to plan



                                       21
<PAGE>


     participants  (such  payments  include,  but are  not  limited  to,  death,
     disability, retirement, or separation of service), (2) distributions from a
     custodial  account under Section  403(b)(7) of the Internal Revenue Code or
     an IRA due to death,  disability,  minimum distribution  requirements after
     attainment of age 70 1/2 or, for accounts  established  prior to January 1,
     1998,  attainment  of age 59 1/2,  and (3) a  tax-free  return of an excess
     contribution to an IRA;

(3)  in whole or in part, in connection  with shares sold to current and retired
     Directors of the Fund;

(4)  in whole or in part, in connection  with shares sold to any state,  county,
     or city or any instrumentality,  department,  authority, or agency thereof,
     which is prohibited by applicable  investment laws from paying a sales load
     or commission in connection with the purchase of any registered  investment
     management company;

(5)  in whole or in part, in connection with systematic withdrawals;

(6)  in connection with  participation  in the Merrill Lynch Small Market 401(k)
     Program.

If, with respect to a redemption of any Class A, Class B, or Class D shares sold
by a dealer, the CDSC is waived because the redemption qualifies for a waiver as
set forth  above,  the dealer  shall remit to Seligman  Advisors  promptly  upon
notice,  an amount  equal to the  payment  or a portion of the  payment  made by
Seligman Advisors at the time of sale of such shares.

Payment in Securities.  In addition to cash,  the Fund may accept  securities in
payment for Fund shares sold at the applicable  public offering price (net asset
value  and,  if  applicable,  any  sales  charge),  although  the Fund  does not
presently intend to accept securities in payment for Fund shares. Generally, the
Fund will only consider  accepting  securities (l) to increase its holdings in a
portfolio  security,  or (2) if Seligman  determines that the offered securities
are a suitable  investment for the Fund and in a sufficient amount for efficient
management.  Although no minimum has been  established,  it is expected that the
Fund would not accept securities with a value of less than $100,000 per issue in
payment  for  shares.  The Fund may reject in whole or in part offers to pay for
Fund shares with securities,  may require partial payment in cash for applicable
sales  charges,  and may  discontinue  accepting  securities as payment for Fund
shares  at any  time  without  notice.  The  Fund  will  not  accept  restricted
securities in payment for shares. The Fund will value accepted securities in the
manner provided for valuing portfolio securities of the Fund.

Fund Reorganizations

Class A shares may be issued without an initial sales charge in connection  with
the acquisition of cash and securities owned by other investment companies.  Any
CDSC will be waived in connection  with the  redemption of shares of the Fund if
the Fund is combined with another  Seligman mutual fund, or in connection with a
similar reorganization transaction.

Offering Price

When you buy or sell fund shares, you do so at the Class's net asset value (NAV)
next calculated  after Seligman  Advisors  accepts your request.  Any applicable
sales charge will be added to the purchase price for Class A shares.

NAV per share of each class of the Fund is determined as of the close of regular
trading on the New York Stock Exchange  (normally,  4:00 p.m.  Eastern time), on
each day that the NYSE is open for business. The NYSE is currently closed on New
Year's Day, Martin Luther King, Jr. Day, Presidents' Day, Good Friday,  Memorial
Day,  Independence Day, Labor Day, Thanksgiving Day, and Christmas Day. The Fund
will  also  determine  NAV for  each  class  on each  day in  which  there  is a
sufficient degree of trading in the Fund's portfolio  securities that the NAV of
Fund shares might be materially affected.  NAV per share for a class is computed
by dividing such class's share of the value of the net assets of the



                                       22
<PAGE>


Fund (i.e.,  the value of its assets less  liabilities)  by the total  number of
outstanding  shares of such  class.  All  expenses  of the Fund,  including  the
management  fee,  are  accrued  daily and taken into  account for the purpose of
determining  NAV. The NAV of Class B and Class D shares will  generally be lower
than the NAV of Class A shares as a result of the higher 12b-1 fees with respect
to such shares.

Portfolio  securities  are  valued  at the last  sale  price  on the  securities
exchange or  securities  market on which such  securities  primarily are traded.
Securities  not listed on an exchange or  securities  market,  or  securities in
which there were no  transactions,  are valued at the average of the most recent
bid and asked price,  except in the case of open short positions where the asked
price is available.  Securities traded on a foreign exchange or over-the-counter
market are valued at the last sales price on the  primary  exchange or market on
which they are traded.  United Kingdom securities and securities for which there
are no recent  sales  transactions  are valued based on  quotations  provided by
primary  market makers in such  securities.  Any  securities or other assets for
which recent  market  quotations  are not readily  available  are valued at fair
value as  determined  in  accordance  with  procedures  approved by the Board of
Directors.  Short-term  obligations  with  less than  sixty  days  remaining  to
maturity are generally  valued at amortized cost.  Short-term  obligations  with
more than sixty days  remaining  to  maturity  will be valued at current  market
value until the sixtieth  day prior to  maturity,  and will then be valued on an
amortized cost basis based on the value on such date unless the Board determines
that this amortized  cost value does not represent  fair market value.  Expenses
and fees,  including the investment  management fee, are accrued daily and taken
into account for the purpose of determining the net asset value of Fund shares.

Generally,  trading in foreign securities,  as well as US Government securities,
money market instruments and repurchase agreements,  is substantially  completed
each day at  various  times  prior to the close of the NYSE.  The values of such
securities  used in computing  the net asset value of the shares of the Fund are
determined as of such times.  Foreign currency exchange rates are also generally
determined prior to the close of the NYSE.

For  purposes  of  determining  the net asset  value per share of the Fund,  all
assets  and  liabilities  initially  expressed  in  foreign  currencies  will be
converted  into US dollars at the mean  between the bid and offer prices of such
currencies  against  US  dollars  quoted  by a  major  bank  that  is a  regular
participant in the foreign  exchange market or on the basis of a pricing service
that takes into account the quotes provided by a number of such major banks.

Specimen Price Make-Up

Under  the  current  distribution  arrangements  between  the Fund and  Seligman
Advisors,  Class A shares are sold with a maximum  initial sales charge of 4.75%
and Class B and Class D shares are sold at NAV(1).  Using  each  Class's  NAV at
December  31,  1998,  the  maximum  offering  price of the  Fund's  shares is as
follows:

Class A
     Net asset value per share ............................................ $

     Maximum sales charge (4.75% of offering price) ....................... $

     Offering price to public ............................................. $
                                                                            =

Class B
     Net asset value and offering price per share(1) ...................... $

Class D
     Net asset value and offering price per share(1) ...................... $
- - --------------
(1)  Class B shares are  subject to a CDSC  declining  from 5% in the first year
     after purchase to 0% after six years.  Class D shares are subject to a CDSC
     of 1% on redemptions within one year of purchase.


                                       23
<PAGE>


Redemption in Kind

The  procedures  for selling Fund shares under  ordinary  circumstances  are set
forth in the Prospectus. In unusual circumstances,  payment may be postponed, or
the right of  redemption  postponed  for more than seven  days,  if the  orderly
liquidation  of  portfolio  securities  is  prevented  by  the  closing  of,  or
restricted  trading  on, the NYSE  during  periods of  emergency,  or such other
periods  as ordered by the  Securities  and  Exchange  Commission.  Under  these
circumstances, redemption proceeds may be made in securities. If payment is made
in securities,  a shareholder may incur brokerage  expenses in converting  these
securities to cash.

                              Taxation of the Fund

The Fund is  qualified  and  intends  to  continue  to  qualify  as a  regulated
investment  company under  Subchapter M of the Internal  Revenue Code.  For each
year so qualified,  the Fund will not be subject to federal  income taxes on its
net investment  income and capital gains,  if any,  realized  during any taxable
year,  which it distributes to its  shareholders,  provided that at least 90% of
its net investment  income and net short-term  capital gains are  distributed to
shareholders each year.

Dividends  from net  investment  income and  distributions  from net  short-term
capital gains are taxable as ordinary income to  shareholders,  whether received
in cash or reinvested in additional  shares. To the extent designated as derived
from the  Fund's  dividend  income  that  would be  eligible  for the  dividends
received deduction if the Fund were not a regulated investment company, they are
eligible,  subject  to  certain  restrictions,  for the 70%  dividends  received
deduction for corporations.

Distributions  of net capital gains (i.e.,  the excess of net long-term  capital
gains over any net  short-term  losses) are taxable as long-term  capital  gain,
whether  received in cash or invested in  additional  shares,  regardless of how
long the shares  have been held by a  shareholder.  Such  distributions  are not
eligible for the dividends received deduction allowed to corporate shareholders.
Shareholders receiving  distributions in the form of additional shares issued by
the Fund will be treated for federal  income tax  purposes as having  received a
distribution  in an  amount  equal  to the  fair  market  value  on the  date of
distribution of the shares received.  Individual  shareholders generally will be
subject to federal tax on  distributions  of net capital gains at a maximum rate
of 20% if designated as derived from the Fund's capital gains from property held
for more than one year.

Any gain or loss  realized  upon a sale or redemption of shares in the Fund by a
shareholder  who is not a dealer in  securities  will  generally be treated as a
long-term  capital  gain or loss if the shares  have been held for more than one
year and otherwise as a short-term capital gain or loss. Individual shareholders
will be subject to federal  income tax on net capital gains at a maximum rate of
20% in  respect of shares  held for more than one year.  Net  capital  gain of a
corporate shareholder is taxed at the same rate as ordinary income.  However, if
shares on which a long-term  capital  gain  distribution  has been  received are
subsequently  sold or redeemed  and such shares have been held for six months or
less, any loss realized will be treated as long-term  capital loss to the extent
that it offsets the long-term capital gain  distribution.  In addition,  no loss
will be  allowed  on the sale or other  disposition  of  shares  of the Fund if,
within a period  beginning  30 days before the date of such sale or  disposition
and  ending 30 days  after such date,  the  holder  acquires  (including  shares
acquired  through  dividend  reinvestment)  securities  that  are  substantially
identical to the shares of the Fund.

In  determining  gain or loss on shares  of the Fund that are sold or  exchanged
within 90 days after acquisition,  a shareholder generally will not be permitted
to  include  in the tax basis  attributable  to such  shares  the  sales  charge
incurred in acquiring such shares to the extent of any  subsequent  reduction of
the sales charge by reason of the Exchange or Reinstatement Privilege offered by
the Fund. Any sales charge not taken into account in  determining  the tax basis
of shares sold or exchanged  within 90 days after  acquisition  will be added to
the  shareholder's  tax basis in the shares acquired pursuant to the Exchange or
Reinstatement Privilege.


                                       24
<PAGE>


The Fund will  generally  be subject to an excise tax of 4% on the amount of any
income  or  capital  gains,  above  certain  permitted  levels,  distributed  to
shareholder  on a  basis  such  that  such  income  or gain  is not  taxable  to
shareholders  in the  calendar  year  in  which  it  was  earned  by  the  Fund.
Furthermore,  dividends  declared in October,  November or December,  payable to
shareholders  of  record  on a  specified  date in such a month  and paid in the
following  January  will be treated as having been paid by the Fund and received
by each shareholder in December. Under this rule, therefore, shareholders may be
taxed in one year on dividends or distributions  actually received in January of
the following year.

Shareholders  are urged to consult their tax advisors  concerning  the effect of
federal income taxes in their individual circumstances.

Unless a shareholder includes a certified taxpayer identification number (social
security number for  individuals) on the account  application and certifies that
the  shareholder is not subject to backup  withholding,  the fund is required to
withhold  and remit to the US  Treasury  a portion  of  distributions  and other
reportable  payments to the shareholder.  The rate of backup withholding is 31%.
Shareholders should be aware that, under regulations promulgated by the Internal
Revenue Service, the Fund may be fined $50 annually for each account for which a
certified taxpayer identification number is not provided. In the event that such
a fine is  imposed,  the Fund may charge a service  fee of up to $50 that may be
deducted from the  shareholder's  account and offset  against any  undistributed
dividends  and capital gain  distributions.  The Fund also reserves the right to
close  any  account  which  does not have a  certified  taxpayer  identification
number.

                                  Underwriters

Distribution of Securities

The Fund and Seligman  Advisors are parties to a  Distributing  Agreement  dated
January 1, 1993 under which  Seligman  Advisors acts as the exclusive  agent for
distribution  of shares of the Fund.  Seligman  Advisors  accepts orders for the
purchase of Fund shares, which are offered continuously.  As general distributor
of the Fund's common stock, Seligman Advisors allows reallowances to all dealers
on sales of Class A shares,  as set forth  above  under  "Dealer  Reallowances."
Seligman  Advisors  retains the  balance of sales  charges and any CDSCs paid by
investors.

Total sales charges paid by  shareholders  of Class A shares of the Fund for the
years ended  December  31,  1998,  1997 and 1996,  amounted to $ ,  $578,570,and
$900,149,  respectively,  of which $_____, $65,673, and $102,883,  respectively,
was retained by Seligman Advisors.

Compensation

Seligman  Advisors,  which is an  affiliated  person  of  Seligman,  which is an
affiliated  person of the Fund,  received the  following  commissions  and other
compensation from the Fund during its fiscal year ended December 31, 1998:

<TABLE>
<CAPTION>
      Net Underwriting           Compensation on
        Discounts and            Redemptions and
         Commissions               Repurchases
       (Class A Sales          (CDSC on Class A and          Brokerage              Other
      Charge Retained)          Class D Retained)           Commissions          Compensation (1)
      ----------------          ----------------            -----------          ------------

          <S>                       <C>                       <C>                  <C>        
          $                         $                         $                    $
</TABLE>

(1)  Seligman  Advisors  has sold its  rights to  collect  any CDSC  imposed  on
     redemptions of Class B shares to FEP Capital,  L.P., in connection  with an
     arrangement  with FEP Capital,  L.P. as discussed above under "12b-1 Plan."
     In connection with this  arrangement,  Seligman  Advisors receives payments
     from FEP  Capital,  L.P.  based on the value of Class B shares  sold.  Such
     payments received for the year ended December 31, 1998 are reflected in the
     table.


                                       25
<PAGE>


Other Payments

Seligman  Advisors shall pay  broker/dealers,  from its own resources,  a fee on
purchases of Class A shares of  $1,000,000  or more (NAV sales),  calculated  as
follows:  1.00% of NAV sales up to but not  including  $2  million;  .80% of NAV
sales from $2 million up to but not including $3 million; .50% of NAV sales from
$3 million up to but not  including  $5  million;  and .25% of NAV sales from $5
million and above.  The calculation of the fee will be based on assets held by a
"single  person,"  including an individual,  members of a family unit comprising
husband, wife and minor children purchasing securities for their own account, or
a trustee or other fiduciary purchasing for a single fiduciary account or single
trust.  Purchases made by a trustee or other  fiduciary for a fiduciary  account
may not be  aggregated  purchases  made on  behalf  of any  other  fiduciary  or
individual account.

Seligman Advisors shall also pay broker/dealers,  from its own resources,  a fee
on assets of certain  investments in Class A shares of the Seligman mutual funds
participating  in an "eligible  employee  benefit plan" that are attributable to
the particular broker/dealer. The shares eligible for the fee are those on which
an initial sales charge was not paid because either the  participating  eligible
employee benefit plan has at least (1) $500,000  invested in the Seligman mutual
funds or (2) 50 eligible employees to whom such plan is made available.  Class A
shares  representing  only an initial  purchase of Seligman Cash Management Fund
are not eligible for the fee. Such shares will become  eligible for the fee once
they are exchanged for shares of another  Seligman  mutual fund.  The payment is
based on  cumulative  sales  for each Plan  during a single  calendar  year,  or
portion thereof.  The payment  schedule,  for each calendar year, is as follows:
1.00% of sales up to but not including $2 million; .80% of sales from $2 million
up to but not including $3 million;  .50% of sales from $3 million up to but not
including $5 million; and .25% of sales from $5 million and above.

Seligman  Advisors may from time to time assist  dealers by, among other things,
providing  sales  literature  to, and  holding  informational  programs  for the
benefit of, dealers' registered representatives. Seligman Advisors may from time
to time pay a bonus or other  incentive  to  dealers  that  sell  shares  of the
Seligman  mutual  funds.  Such  bonus  or other  incentive  may take the form of
payment for travel  expenses,  including  lodging,  incurred in connection  with
trips  taken by  qualifying  registered  representatives  and  members  of their
families  to places  within or outside the United  States.  The cost to Seligman
Advisors of such  promotional  activities and payments shall be consistent  with
the rules of the National  Association of Securities  Dealers,  Inc., as then in
effect.

                         Calculation of Performance Data

The average annual total returns for the Fund's Class A shares for the one-year,
five-year,  and ten-year periods through December 31, 1998, were 11.84%, 14.94%,
and 15.00%, respectively. These returns were computed by subtracting the maximum
sales  charge of 4.75% of public  offering  price and  assuming  that all of the
dividends and capital gain distributions paid by the Fund over the relevant time
period were reinvested.  It was then assumed that at the end of each period, the
entire amount was redeemed.  The average annual total return was then calculated
by calculating  the annual rate required for the initial  payment to grow to the
amount which would have been received upon such  redemption  (i.e.,  the average
annual  compound  rate of return).  Table A below  illustrates  the total return
(income and  capital) on Class A shares of the Fund,  assuming  all dividend and
capital gain  distributions are reinvested in additional shares. It shows that a
$1,000 investment in Class A shares, assuming payment of the initial 4.75% sales
charge,  made on December 31, 1988, had a value of $___ in on December 31, 1998,
resulting in an aggregate total return of __%.

The average  annual total returns for the Fund's Class B shares for the one-year
period  ended  December  31,  1998  and for  the  period  from  April  22,  1996
(inception)  through  December 31, 1998,  were 11.53% and 17.09%,  respectively.
These  returns  were  computed  assuming  that all  dividends  and capital  gain
distributions  paid by the Fund's Class B shares,  if any, were  reinvested over
the relevant  time  period.  It was then assumed that at the end of each period,
the entire amount was redeemed, subtracting the



                                       26
<PAGE>


applicable  CDSC.  Table B illustrates  the total return (income and capital) on
Class  B  shares  of  the  Fund,   assuming  all   dividends  and  capital  gain
distributions  are  reinvested  in  additional  shares.  It shows  that a $1,000
investment  in Class B shares on April 22, 1996  (commencement  of operations of
Class B  shares)  had a value of $___ on  December  31,  1998,  resulting  in an
aggregate total return of __%.

The average  annual total returns for the Fund's Class D shares for the one-year
and  five-year  periods  ended  December 31, 1998 and for the period from May 3,
1993  (inception)  through December 31, 1998, were 15.56%,  15.05%,  and 14.92%,
respectively. These returns were computed assuming that all of the dividends and
capital  gain  distributions  paid by the Fund's  Class D shares,  if any,  were
reinvested over the relevant time period. It was then assumed that at the end of
each period, the entire amount was redeemed, subtracting for the one year period
the 1% CDSC, if  applicable.  Table C illustrates  the total return  (income and
capital) on Class D shares of the Fund,  assuming all dividends and capital gain
distributions  are  reinvested  in  additional  shares.  It shows  that a $1,000
investment in Class D shares made on May 3, 1993  (commencement of operations of
Class D  shares)  had a value of $___ on  December  31,  1998,  resulting  in an
aggregate total return of __%.

The  results  shown  below  should not be  considered  a  representation  of the
dividend  income or gain or loss in capital  value which may be realized from an
investment made in a class of shares of the Fund today.

                                TABLE A - CLASS A

<TABLE>
<CAPTION>
                        Value of         Value of                         Total Value
       Year             Initial        Capital Gain       Value of             Of               Total
     Ended(1)        Investment(2)     Distributions      Dividends       Investment(2)      Return(1)(3)
     --------        -------------     -------------      ---------       -------------      ------------
     <S>              <C>                 <C>             <C>              <C>                <C>  
     12/31/89         $
     12/31/90
     12/31/91
     12/31/92
     12/31/93
     12/31/94
     12/31/95
     12/31/96
     12/31/97
     12/31/98
</TABLE>

                                TABLE B - CLASS B

<TABLE>
<CAPTION>
                        Value of         Value of                         Total Value
      Period            Initial        Capital Gain       Value of             Of               Total
     Ended(1)        Investment(2)     Distributions      Dividends       Investment(2)      Return(1)(3)
     --------        -------------     -------------      ---------       -------------      ------------
     <S>                <C>                <C>               <C>             <C>               <C>   
     12/31/96           $1,005             $ 76              $11             $1,092
     12/31/97            1,033              239               27              1,299
     12/31/98                                                                                           %
</TABLE>
                    
                                TABLE C - CLASS D

<TABLE>
<CAPTION>
                        Value of         Value of                         Total Value
      Period            Initial        Capital Gain       Value of             Of               Total
     Ended(1)        Investment(2)     Distributions      Dividends       Investment(2)      Return(1)(3)
     --------        -------------     -------------      ---------       -------------      ------------
     <S>                <C>                 <C>              <C>             <C>               <C>
     12/31/93           $1,013              $62              $16             $1,091
     12/31/94              909              115               32              1,056
     12/31/95            1,065              220               57              1,342
     12/31/96            1,119              338               81              1,538
     12/31/97            1,197              107              583              1,887
     12/31/98                                                                                         %
</TABLE>


                                       27
<PAGE>

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

(1)  For the ten-year  period ended  December 31, 1998 for Class A shares,  from
     commencement  of  operations  of Class B shares on April 22,  1996 and from
     commencement of operations of Class D shares on May 3, 1993.

(2)  The "Value of Initial Investment" as of the date indicated (1) reflects the
     effect of the maximum  initial  sales charge or CDSC,  if  applicable,  (2)
     assumes that all  dividends  and capital gain  distributions  were taken in
     cash,  and (3)  reflects  changes  in the net  asset  value  of the  shares
     purchased  with  the  hypothetical  initial  investment.  "Total  Value  of
     Investment"  (1) reflects the effect of the CDSC,  if  applicable,  and (2)
     assumes investment of all dividends and capital gain distributions.

(3)  Total return for each Class of shares of the Fund is calculated by assuming
     a hypothetical  initial investment of $1,000 at the beginning of the period
     specified;  subtracting  the  maximum  sales  charge  for  Class A  shares;
     determining  total value of all  dividends  and capital gain  distributions
     that would have been paid  during the period on such shares  assuming  that
     each  dividend or capital  gain  distribution  was  invested in  additional
     shares at net asset value; calculating the total value of the investment at
     the end of the period;  subtracting the CDSC on Class B and Class D shares,
     if applicable;  and finally,  by dividing the difference between the amount
     of the hypothetical  initial  investment at the beginning of the period and
     its total value at the end of the period by the amount of the  hypothetical
     initial investment.

The total returns and average annual total returns of Class A shares quoted from
time to time for periods through December 31, 1992, do not reflect the deduction
of 12b-1 fees,  effective  January 1, 1993. The total returns and average annual
returns of Class A shares quoted from time to time for periods through April 10,
1991, do not reflect the increased  management fee approved by  shareholders  on
April 10, 1991.  The total returns and average  annual total returns for Class A
and Class D shares for  periods  through  December  31,  1995 do not reflect the
increased  management  fee,  approved by  shareholders on December 12, 1995, and
effective  on  January 1, 1996.  These  fees,  if  reflected,  would  reduce the
performance quoted.

From time to time,  reference may be made in advertising or promotional material
to performance information,  including mutual fund rankings,  prepared by Lipper
Analytical  Service,  Inc., an independent  reporting service which monitors the
performance of mutual funds. In calculating the total return of the Fund's Class
A, Class B and Class D shares,  the Lipper  analysis  assumes  investment of all
dividends and distributions paid but does not take into account applicable sales
charges. The Fund may also refer in advertisements in other promotional material
to articles, comments, listings and columns in the financial press pertaining to
the Fund's performance.  Examples of such financial and other press publications
include  BARRON'S,  BUSINESS  WEEK,  CDA/WIESENBERGER  MUTUAL  FUNDS  INVESTMENT
REPORT,  CHRISTIAN  SCIENCE  MONITOR,   FINANCIAL  PLANNING,   FINANCIAL  TIMES,
FINANCIAL WORLD,  FORBES,  FORTUNE,  INDIVIDUAL  INVESTOR,  INVESTMENT  ADVISOR,
INVESTORS  BUSINESS  DAILY,  KIPLINGER'S,  LOS ANGELES  TIMES,  MONEY  MAGAZINE,
MORNINGSTAR, INC., PENSION AND INVESTMENTS, SMART MONEY, THE NEW YORK TIMES, THE
WALL STREET  JOURNAL,  USA TODAY,  U.S. NEWS AND WORLD REPORT,  WORTH  MAGAZINE,
WASHINGTON POST AND YOUR MONEY.

The Fund's advertising or promotional  material may make reference to the Fund's
"Beta."  "Standard  Deviation,"  or "Alpha." Beta measures the volatility of the
Fund, as compared to that of the overall market. Standard deviation measures how
widely the Fund's performance has varied from its average performance, and is an
indicator of the Fund's potential for volatility.  Alpha measures the difference
between  the returns of the Fund and the  returns of the  market,  adjusted  for
volatility.

                              Financial Statements

The Annual Report to shareholders  for the year ended December 31, 1998 contains
a schedule of the  investments  of the Fund as of December 31, 1998,  as well as
certain other  financial  information as of that date. The financial  statements
and notes included in the Annual Report,  and the Independent  Auditors'  Report
thereon,  are  incorporated  herein by  reference.  The  Annual  Report  will be
furnished without charge to investors who request copies of this SAI.

                                       28

<PAGE>

                               General Information

Custodian.  Investors  Fiduciary Trust Company,  801 Pennsylvania,  Kansas City,
Missouri  64105 serves as custodian of the Fund.  It also  maintains,  under the
general  supervision of the Manager,  the accounting  records and determines the
net asset value for the Fund.

Auditors.  Deloitte & Touche LLP,  independent  auditors,  have been selected as
auditors of the Fund. Their address is Two World Financial Center,  New York, NY
10281.

                                       29

<PAGE>

                                    Appendix

                 HISTORY OF J. & W. SELIGMAN & CO. INCORPORATED

Seligman's  beginnings  date back to 1837, when Joseph  Seligman,  the oldest of
eight brothers,  arrived in the United States from Germany. He earned his living
as a pack  peddler in  Pennsylvania,  and began  sending for his  brothers.  The
Seligmans became successful merchants,  establishing businesses in the South and
East.

Backed by nearly thirty years of business  success - culminating  in the sale of
government securities to help finance the Civil War - Joseph Seligman,  with his
brothers,  established the international  banking and investment firm of J. & W.
Seligman & Co. In the years that followed,  the Seligman  Complex played a major
role in the  geographical  expansion and  industrial  development  of the United
States.

The Seligman Complex:

 .... Prior to 1900

o    Helps finance America's fledgling railroads through underwritings.

o    Is admitted to the New York Stock  Exchange  in 1869.  Seligman  remained a
     member of the NYSE until 1993,  when the  evolution of its business made it
     unnecessary.

o    Becomes a prominent underwriter of corporate securities, including New York
     Mutual Gas Light Company, later part of Consolidated Edison.

o    Provides financial  assistance to Mary Todd Lincoln and urges the Senate to
     award her a pension.

o    Is appointed U.S. Navy fiscal agent by President Grant.

o    Becomes a leader in raising  capital  for  America's  industrial  and urban
     development.

 .... 1900-1910

o    Helps Congress finance the building of the Panama Canal.

 .... 1910s

o    Participates  in  raising  billions  for Great  Britain,  France and Italy,
     helping to finance World War I.

 .... 1920s

o    Participates  in hundreds of successful  underwritings  including those for
     some  of the  Country's  largest  companies:  Briggs  Manufacturing,  Dodge
     Brothers, General Motors,  Minneapolis-Honeywell Regulatory Company, Maytag
     Company, United Artists Theater Circuit and Victor Talking Machine Company.

o    Forms  Tri-Continental  Corporation  in 1929,  today the nation's  largest,
     diversified  closed-end equity investment company,  with over $2 billion in
     assets, and one of its oldest.

 .... 1930s

o    Assumes  management of Broad Street  Investing  Co. Inc.,  its first mutual
     fund, today known as Seligman Common Stock Fund, Inc.

o    Establishes Investment Advisory Service.


                                       30
<PAGE>

 .... 1940s

o    Helps shape the Investment Company Act of 1940.

o    Leads in the  purchase  and  subsequent  sale to the public of Newport News
     Shipbuilding  and  Dry  Dock  Company,  a  prototype  transaction  for  the
     investment banking industry.

o    Assumes management of National Investors Corporation, today Seligman Growth
     Fund, Inc.

o    Establishes Whitehall Fund, Inc., today Seligman Income Fund, Inc.

 .... 1950-1989

o    Develops new open-end  investment  companies.  Today,  manages more than 40
     mutual fund  portfolios.  o Helps pioneer  state-specific,  municipal  bond
     funds, today managing a national and 18 state-specific municipal funds.

o    Establishes J. & W. Seligman Trust Company and J. & W. Seligman  Valuations
     Corporation.

o    Establishes  Seligman  Portfolios,  Inc.,  an  investment  vehicle  offered
     through variable annuity products.

 .... 1990s

o    Introduces  Seligman  Select  Municipal  Fund,  Inc. and  Seligman  Quality
     Municipal  Fund,  Inc.  two  closed-end  funds that invest in high  quality
     municipal bonds.

o    In 1991 establishes a joint venture with Henderson plc, of London, known as
     Seligman Henderson Co., to offer global investment products.

o    Introduces  to  the  public   Seligman   Frontier   Fund,   Inc.,  a  small
     capitalization mutual fund.

o    Launches  Seligman  Henderson Global Fund Series,  Inc., which today offers
     five separate  series:  Seligman  Henderson  International  Fund,  Seligman
     Henderson  Global  Smaller  Companies  Fund,   Seligman   Henderson  Global
     Technology Fund,  Seligman  Henderson Global Growth  Opportunities Fund and
     Seligman Henderson Emerging Markets Growth Fund.

o    Launches  Seligman  Value Fund Series,  Inc.,  which  currently  offers two
     separate series: Seligman Large-Cap Value Fund and Seligman Small-Cap Value
     Fund.





                                       31


<PAGE>

                                                                File No. 2-10835
                                                                         811-234

PART C. OTHER INFORMATION
7
Item 23.   Exhibits.

   
     All Exhibits have been  previously  filed;  except  Exhibits marked with an
asterisk (*) which will be filed by amendment.
    

(a)      Articles  of  Amendment  and  Articles  Supplementary  to  Articles  of
         Incorporation of Registrant. (Incorporated by reference to Registrant's
         Post-Effective Amendment No. 75 filed on April 29, 1997.)

(b)      By-laws of the Corporation.  (Incorporated by reference to Registrant's
         Post-Effective Amendment No. 75 filed on April 29, 1997.)

(c)      Specimen  certificate  of  Class  B  Capital  Stock.  (Incorporated  by
         reference  to Form SE filed on  behalf of the  Registrant  on April 16,
         1996)

(c)(1)   Specimen  certificate  of  Class  D  Capital  Stock.  (Incorporated  by
         Reference  to  Registrant's  Post-Effective  Amendment  No. 71 filed on
         April 23, 1993.)

(d)      Amended Management  Agreement between Registrant and J. & W. Seligman &
         Co.   Incorporated.   (Incorporated  by  reference  to   Post-Effective
         Amendment No. 74 filed on April 19, 1996.)

   
(e)      Copy of Amended Distributing  Agreement between Registrant and Seligman
         Advisors,   Inc.   (formerly,   Seligman  Financial   Services,   Inc.)
         (Incorporated by reference to Registrant's Post-Effective Amendment No.
         75 filed on April 29, 1997.)

(e)(1)   Copy  of  Amended  Sales  Agreement  between  Seligman  Advisors,  Inc.
         (formerly,    Seligman   Financial   Services,   Inc.)   and   Dealers.
         (Incorporated by reference to Post-Effective  Amendment No. 74 filed on
         April 19, 1996.)

(e)(2)   Form of Sales Agreement  between  Seligman  Advisors,  Inc.  (formerly,
         Seligman  Financial  Services,  Inc.) and Dean  Witter  Reynolds,  Inc.
         (Incorporated by reference to Exhibit 6b of Registration  Statement No.
         2-33566, Post-Effective Amendment No. 53 filed on April 28, 1997.)

(e)(3)   Form of Sales Agreement  between  Seligman  Advisors,  Inc.  (formerly,
         Seligman Financial Services,  Inc.) and Dean Witter Reynolds, Inc. with
         respect to certain Chilean  institutional  investors.  (Incorporated by
         reference  to Exhibit 6c of  Registration  Statement  No.  2-33566,  to
         Registrant's Post-Effective Amendment No. 53 filed on April 28, 1997.)

(e)(4)   Form of Dealer Agreement  between Seligman  Advisors,  Inc.  (formerly,
         Seligman Financial Services,  Inc.) and Smith Barney Inc. (Incorporated
         by  reference  to Exhibit 6d of  Registration  Statement  No.  2-33566,
         Post-Effective Amendment No. 53 filed on April 28, 1997.)
    

(f)      Matched  Accumulation  Plan  of J. & W.  Seligman  & Co.  Incorporated.
         (Incorporated  by reference to Exhibit 7 of Registration  Statement No.
         2-92487,  to  Registrant's  Post-Effective  Amendment  No.  21 filed on
         January 29, 1997.)

(f)(1)   Deferred Compensation Plan for Directors of Seligman Common Stock Fund.
         (Incorporated by reference to Registrant's Post-Effective Amendment No.
         76 filed on April 29, 1998.)

(g)      Copy of Custodian  Agreement between Registrant and Investors Fiduciary
         Trust   Company.    (Incorporated    by   reference   to   Registrant's
         Post-Effective Amendment No. 75 filed on April 29, 1997.)

(h)      Not applicable.

(i)      Opinion  and  Consent  of  Counsel.   (Incorporated   by  reference  to
         Registrant's Post-Effective Amendment No. 75 filed on April 29, 1997.)



<PAGE>

                                                                File No. 2-10835
                                                                         811-234

PART C. OTHER INFORMATION (continued)

   
(j)      *Consent of Independent Auditors.
    

(k)      Not applicable.

(l)      Purchase  Agreement  (Investment  Letter) for Initial  Capital  between
         Registrant's  Class B shares and J. & W.  Seligman & Co.  Incorporated.
         (Incorporated by reference to Registrant's Post-Effective Amendment No.
         75 filed on April 29, 1997.)

(l)(1)   Purchase  Agreement  (Investment  Letter) for Initial  Capital  between
         Registrant's  Class D Shares and J. & W.  Seligman & Co.  Incorporated.
         (Incorporated by reference to Registrant's Post-Effective Amendment No.
         75 filed on April 29, 1997.)

(m)      Form of Administration,  Shareholder  Services and Distribution Plan of
         Registrant.  (Incorporated by reference to Post-Effective Amendment No.
         74 filed on April 19, 1996.)

(m)(1)   Form of Administration, Shareholder Services and Distribution Agreement
         between Seligman Advisors, Inc. (formerly, Seligman Financial Services,
         Inc.)  and  Dealers.   (Incorporated   by  reference  to   Registrant's
         Post-Effective Amendment No. 74 filed on April 19, 1996.)

   
(n)      *Financial Data Schedules.
    

(o)      Copy of  Multi-class  Plan entered into by Registrant  pursuant to Rule
         18f-3  under  the  Investment  Company  Act of 1940.  (Incorporated  by
         reference  to  Registrant's  Post-Effective  Amendment  No. 74 filed on
         April 19, 1996.)

   
Other Exhibits: Power of Attorney  for  Richard R.  Schmaltz.  (Incorporated  by
                reference to Registrant's Post-Effective Amendment No. 76  filed
                on April 29, 1998.)

                Powers of Attorney. (Incorporated  by reference to  Registrant's
                Post-Effective Amendment No. 75 filed on April 29, 1997.)
    

Item 24. Persons Controlled by or Under Common Control with Registrant. Seligman
         Data Corp. ("SDC"), a New York corporation,  is owned by the Registrant
         and  certain   associated   investment   companies.   The  Registrant's
         investment in SDC is recorded at a cost of $22,506.

Item 25. Indemnification.  Reference  is  made  to the  provisions  of  Articles
         Twelfth and Thirteenth of Registrant's Amended and Restated Articles of
         Incorporation  filed as Exhibit 24(b)(1) and Article IV of Registrant's
         Amended and Restated  By-laws filed as Exhibit 24(b)(2) to Registrant's
         Post-Effective Amendment No. 75 to the Registration Statement.

         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.



<PAGE>

                                                                File No. 2-10835
                                                                         811-234

PART C.  OTHER INFORMATION (continued)

Item 26. 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 associated investment companies. They are Seligman
         Capital Fund,  Inc.,  Seligman Cash  Management  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  Portfolios,  Inc.,  Seligman  Quality
         Municipal Fund, Inc.,  Seligman Select  Municipal Fund, Inc.,  Seligman
         Value Fund Series, Inc. and Tri-Continental Corporation.

         The Manager has 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, 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,  pursuant to the
         Investment  Advisers  Act of 1940 (SEC File No.  801-15798),  which was
         filed on March 25, 1998.

Item 27. Principal Underwriters.

         (a)   The names of each investment  company (other than the Registrant)
               for   which   Registrant's    principal   underwriter   currently
               distributing   securities  of  the  Registrant  also  acts  as  a
               principal underwriter, depositor or investment adviser follow:

               Seligman Cash Management Fund, Inc.
               Seligman Capital 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 Portfolios, Inc.
               Seligman Value Fund Series, Inc.



<PAGE>

                                                                File No. 2-10835
                                                                         811-234

PART C. OTHER INFORMATION (continued)

         (b)  Name  of each  director,  officer  or  partner  of each  principal
         underwriter named in the answer to Item 20:

<TABLE>
   
                    Seligman Advisors, Inc.
                    As of January 31, 1999
    
<CAPTION>
        (1)                                           (2)                                         (3)
Name and Principal                            Positions and Offices                       Positions and Offices
 Business Address                             with Underwriter                            with Registrant
- - ------------------                            ---------------------                       ---------------------
<S>                                           <C>                                         <C>
William C. Morris*                            Director                                    Chairman of the Board and Chief
                                                                                          Executive Officer
Brian T. Zino*                                Director                                    President and Director
Ronald T. Schroeder*                          Director                                    None
Fred E. Brown*                                Director                                    Director Emeritus
William H. Hazen*                             Director                                    None
Thomas G. Moles*                              Director                                    None
David F. Stein*                               Director                                    None
Stephen J. Hodgdon*                           President and Director                      None
Charles W. Kadlec*                            Chief Investment Strategist                 None
Lawrence P. Vogel*                            Senior Vice President, Finance              Vice President
   
Edward F. Lynch*                              Senior Vice President, National             None
                                              Sales Director
    
James R. Besher                               Senior Vice President, Divisional           None
14000 Margaux Lane                            Sales Director
Town & Country, MO  63017
Gerald I. Cetrulo, III                        Senior Vice President, Sales                None
140 West Parkway
Pompton Plains, NJ  07444
Jonathan G. Evans                             Senior Vice President, Sales                None
222 Fairmont Way
Ft. Lauderdale, FL  33326
T. Wayne Knowles                              Senior Vice President,                      None
104 Morninghills Court                        Divisional Sales Director
Cary, NC  27511
Joseph Lam                                    Senior Vice President, Regional             None
Seligman International Inc.                   Director, Asia
Suite 1133, Central Building
One Pedder Street
Central Hong Kong
Bradley W. Larson                             Senior Vice President, Sales                None
367 Bryan Drive
Alamo, CA  94526
Richard M. Potocki                            Senior Vice President, Regional             None
Seligman International UK Limited             Director, Europe and the Middle East
Berkeley Square House 2nd Floor
Berkeley Square
London, United Kingdom W1X 6EA
Bruce M. Tuckey                               Senior Vice President, Sales                None
41644 Chathman Drive
Novi, MI  48375
</TABLE>



<PAGE>

                                                                File No. 2-10835
                                                                         811-234

PART C. OTHER INFORMATION (continued)

<TABLE>
   
                    Seligman Advisors, Inc.
                    As of January 31, 1999
    
<CAPTION>
        (1)                                           (2)                                         (3)
Name and Principal                            Positions and Offices                       Positions and Offices
 Business Address                             with Underwriter                            with Registrant
- - ------------------                            ---------------------                       ---------------------
<S>                                           <C>                                         <C>
Andrew S. Veasey                              Senior Vice President, Sales                None
14 Woodside
Rumson, NJ  07760
J. Brereton Young*                            Senior Vice President, National             None
                                              Accounts Manager
Peter J. Campagna                             Vice President, Regional Retirement         None
1130 Green Meadow Court                       Plans Manager
Acworth, GA  30102
   
Matthew A. Digan*                             Senior Vice President, Director of          None
                                              Mutual Fund Marketing
    
Mason S. Flinn                                Vice President, Regional Retirement         None
159 Varennes                                  Plans Manager
San Francisco, CA  94133
   
Robert T. Hausler*                            Senior Vice President, Senior               None
                                              Portfolio Specialist
    
Marsha E. Jacoby*                             Vice President, Offshore Business           None
                                              Manager
William W. Johnson*                           Vice President, Order Desk                  None
   
Michelle L. McCann (Rappa)*                   Senior Vice President, Director of          None
                                              Retirement Plans
Scott H. Novak*                               Senior Vice President, Insurance            None
    
Ronald W. Pond*                               Vice President, Portfolio Advisor           None
   
Tracy A. Salomon*                             Vice President, Retirement Marketing        None
    
Michael R. Sanders*                           Vice President, Product Manager             None
                                              Managed Money Services
Helen Simon*                                  Vice President, Sales                       None
                                              Administration Manager
Gary A. Terpening*                            Vice President, Director of Business        None
                                              Development
   
Charles L. von Breitenbach, II*               Senior Vice President, Director of          None
                                              Managed Money Services
    
Joan M. O'Connell                             Vice President, Regional Retirement         None
3707 5th Avenue #136                          Plans Manager
San Diego, CA  92103
Charles E. Wenzel                             Vice President, Regional Retirement         None
703 Greenwood Road                            Plans Manager
Wilmington, DE  19807
   
Jeffery C. Pleet*                             Vice President, Regional Retirement         None
                                              Plans Manager
    
Richard B. Callaghan                          Regional Vice President                     None
7821 Dakota Lane
Orland Park, IL  60462
Bradford C. Davis                             Regional Vice President                     None
255 4th Avenue, #2
Kirkland, WA  98033
Christopher J. Derry                          Regional Vice President                     None
2380 Mt. Lebanon Church Road
Alvaton, KY  42122
</TABLE>



<PAGE>

                                                                File No. 2-10835
                                                                         811-234

PART C. OTHER INFORMATION (continued)

<TABLE>
   
                    Seligman Advisors, Inc.
                    As of January 31, 1999
    
<CAPTION>
        (1)                                           (2)                                         (3)
Name and Principal                            Positions and Offices                       Positions and Offices
 Business Address                             with Underwriter                            with Registrant
- - ------------------                            ---------------------                       ---------------------
<S>                                           <C>                                         <C>
Kenneth Dougherty                             Regional Vice President                     None
8640 Finlarig Drive
Dublin, OH  43017
Edward S. Finocchiaro                         Regional Vice President                     None
120 Screenhouse Lane
Duxbury, MA  02332
Michael C. Forgea                             Regional Vice President                     None
32 W. Anapamu Street # 186
Santa Barbara, CA  93101
David L. Gardner                              Regional Vice President                     None
2504 Clublake Trail
McKinney, TX  75070
Carla A. Goehring                             Regional Vice President                     None
11426 Long Pine
Houston, TX  77077
Michael K. Lewallen                           Regional Vice President                     None
908 Tulip Poplar Lane
Birmingham, AL  35244
Judith L. Lyon                                Regional Vice President                     None
163 Haynes Bridge Road, Ste 205
Alpharetta, CA  30201
Stephen A. Mikez                              Regional Vice President                     None
11786 E. Charter Oak
Scottsdale, AZ  85259
Tim O'Connell                                 Regional Vice President                     None
14872 Summerbreeze Way
San Diego, CA  92128
Thomas Parnell                                Regional Vice President                     None
5250 Greystone Drive  #107
Inver Grove Heights, MN  55077
       
Nicholas Roberts                              Regional Vice President                     None
200 Broad Street, Apt. 2225
Stamford, CT  06901
Diane H. Snowden                              Regional Vice President                     None
11 Thackery Lane
Cherry Hill, NJ  08003
   
Craig Prichard                                Regional Vice President                     None
300 Spyglass Drive
Fairlawn, OH  44333
Steve Wilson                                  Regional Vice President                     None
83 Kaydeross Park Road
Saratoga Springs, NY  12866
Eugene P. Sullivan                            Regional Vice President                     None
8 Charles Street, Apt. 603
Baltimore, MD  21201
    
</TABLE>



<PAGE>

                                                                File No. 2-10835
                                                                         811-234

PART C. OTHER INFORMATION (continued)

<TABLE>
   
                    Seligman Advisors, Inc.
                    As of January 31, 1999
    
<CAPTION>
        (1)                                           (2)                                         (3)
Name and Principal                            Positions and Offices                       Positions and Offices
 Business Address                             with Underwriter                            with Registrant
- - ------------------                            ---------------------                       ---------------------
<S>                                           <C>                                         <C>
Kelli A. Wirth Dumser                         Regional Vice President                     None
8618 Hornwood Court
Charlotte, NC  28215
Frank J. Nasta*                               Secretary                                   Secretary
Aurelia Lacsamana*                            Treasurer                                   None
   
Jeffrey S. Dean*                              Vice President, Business Analyst            None
    
Sandra G. Floris*                             Assistant Vice President, Order Desk        None
Keith Landry*                                 Assistant Vice President, Order Desk        None
Gail S. Cushing*                              Assistant Vice President, National          None
                                              Accounts Manager
Albert A. Pisano*                             Assistant Vice President and                None
                                              Compliance Officer
Jack Talvy*                                   Assistant Vice President, Internal          None
                                              Marketing Services Manager
   
Joyce Peress*                                 Assistant Secretary                         Assistant Secretary
    
</TABLE>

*    The principal  business  address of each of these directors and/or officers
     is 100 Park Avenue, New York, NY 10017.

     (c)  Not applicable.

Item 28. Location of Accounts and Records

         (1)    Investors Fiduciary Trust Company
                801 Pennsylvania
                Kansas City, Missouri 64105 and

         (2)    Seligman Data Corp.
                100 Park Avenue
                New York, NY  10017

Item 29. Management Services. Not Applicable.

Item 30. Undertakings.  The Registrant undertakes,  (1) to furnish a copy of the
         Registrant's  latest annual report, upon request and without charge, to
         every person to whom a prospectus  is delivered and (2) if requested to
         do so by the holders of at least ten percent of its outstanding shares,
         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>

                                                                File No. 2-10835
                                                                         811-234

                                   SIGNATURES

   
     Pursuant  to the  requirements  of the  Securities  Act of  1933,  and  the
Investment   Company  Act  of  1940,   the   Registrant  has  duly  caused  this
Post-Effective  Amendment No. 77 to its  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 24th day of February, 1999.

                                             SELIGMAN COMMON STOCK FUND, 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. 77 has been
signed below by the following  persons in the  capacities  indicated on February
24, 1999.

        Signature                                 Title
        ---------                                 -----


/s/  Brian T. Zino                    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     )
    



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