SELIGMAN COMMON STOCK FUND INC
485BPOS, 1999-05-28
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<PAGE>

                                                                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.  79                                 [X]
                                     --

     REGISTRATION STATEMENT UNDER THE INVESTMENT COMPANY ACT OF 1940    [X]


       Amendment No.  27                                                [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  [ ] on (date) pursuant to paragraph
    paragraph (b)                            (a)(1)

[X] on May 28, 1999 pursuant to          [ ] 75 days after filing pursuant to
    paragraph (b)                            paragraph (a)(2)

[ ] 60 days after filing pursuant to     [ ] on (date) pursuant to paragraph
    paragraph (a)(1)                         (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.

                                       1
<PAGE>

                        SELIGMAN
- --------------------------------
                    COMMON STOCK
                      FUND, INC.

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.

[GRAPHIC]

PROSPECTUS

JUNE 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

EQCS1 6/99
<PAGE>

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 Among
 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, which
are 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 looks to identify companies that have attractive
dividend yields relative to their industry 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 (i.e., a specific reason to expect an
acceleration in the rate of growth in earnings).

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 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. The limit on foreign securities does not include ADRs, or
commercial paper and certificates of deposit issued by foreign banks.

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 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 may be changed only with shareholder approval.

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
if you sell your shares at a price lower than you paid for them.

The Fund may not invest more than 25% of its total assets in securities of
companies in any one industry. The Fund may, however, invest more heavily in
certain industries believed to offer good investment opportunities. If 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 usually 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.

Foreign securities or illiquid securities in the Fund's portfolio involve
higher risk and may subject the Fund to higher price volatility. Investing in
securities of foreign issuers involves risks not associated with US
investments, including settlement risks, 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 portfolio turnover rate increases
transaction costs which may increase the Fund's expenses. There may also be
adverse tax consequences for investors in the Fund due to an increase in short-
term capital gains.

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 four 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 the performance of
each Class (except Class C) 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. Class C is a new Class of shares, effective
June 1, 1999, so no performance information is available.

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.

                                  [BAR GRAPH]

                         Class A Annual Total Returns


 1989    1990    1991    1992    1993     1994     1995    1996    1997    1998
26.77%  -3.89%  29.93%  10.86%  14.86%   -1.89%   28.17%  15.44%  23.58%  17.40%

Best quarter return: 16.42% - quarter ended 3/31/91

Worst quarter return: -17.44% - quarter ended 9/30/90


             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 500 of the 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 C Class D
- ----------------                            -------       ------- ------- -------
<S>                                         <C>           <C>     <C>     <C>
Maximum Sales Charge (Load) on Purchases
 (as a % of offering price)...............   4.75% (/1/)   none      1%    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%      1%
Annual Fund Operating Expenses for 1998
- ---------------------------------------
(as a percentage of average net assets)
Management Fees...........................    .65%          .65%    .65%    .65%
Distribution and/or Service (12b-1) Fees..    .24%         1.00%   1.00%   1.00%
Other Expenses............................    .22%          .22%    .22%    .22%
                                             ----          ----    ----    ----
Total Annual Fund Operating Expenses......   1.11%         1.87%   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.

 Management Fees:
 Fees paid out of Fund
 assets to the
 investment manager to
 compensate it for
 managing the Fund.

 12b-1 Fees:
 Fees paid by each
 Class, pursuant to a
 plan adopted by the
 Fund under Rule 12b-1
 of the Investment
 Company Act of 1940.
 The plan allows each
 Class to pay
 distribution and/or
 service fees for the
 sale and distribution
 of its shares and for
 providing services to
 shareholders.

 Other Expenses:
 Miscellaneous expenses
 of running the Fund,
 including such things
 as transfer agency,
 registration, custody,
 and auditing and legal
 fees.

Example

This example is intended to help you compare the expenses of investing in the
Fund with the expenses of investing in other mutual funds. It assumes (1) you
invest $10,000 in the Fund for each period and then sell all of your shares at
the end of that period, (2) your investment has 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:

<TABLE>
<CAPTION>
         1 Year 3 Years 5 Years 10 Years
         ------ ------- ------- --------
<S>      <C>    <C>     <C>     <C>
Class A   $583   $811   $1,058   $1,762
Class B    690    888    1,211    1,992+
Class C    388    682    1,101    2,268
Class D    290    588    1,011    2,190
</TABLE>

If you did not sell your shares at the end of each period, your expenses would
be:

<TABLE>
<CAPTION>
         1 Year 3 Years 5 Years 10 Years
         ------ ------- ------- --------
<S>      <C>    <C>     <C>     <C>
Class A   $583   $811   $1,058   $1,762
Class B    190    588    1,011    1,992+
Class C    288    682    1,101    2,268
Class D    190    588    1,011    2,190
</TABLE>

+ Class B shares will automatically convert to Class A shares after eight
  years.

                                       4
<PAGE>

Management

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

J. & W. Seligman & Co. Incorporated (Seligman), 100 Park Avenue, New York, New
York 10017, is the manager of the Fund. 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 $21.5 billion in assets as of April 30, 1999. Seligman also

provides investment management or advice to institutional or other accounts
having an aggregate value at April 30, 1999, of approximately $10.2 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. For the
year ended December 31, 1998, the management fee paid by the Fund to Seligman
was equal to an annual rate of .65% of the Fund's average daily net assets.

  Affiliates of Seligman:

  Seligman Advisors, Inc.:
  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
  broker or financial
  advisor.

  Seligman Data Corp. (SDC):
  The Fund's shareholder
  service agent; provides
  shareholder account
  services to the Fund at
  cost.

Portfolio Management

The Fund is managed by the Seligman Growth and Income Team, headed by Mr.
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., and Tri-
Continental Corporation.

Mr. Rodney D. Collins, Senior Vice President, Investment Officer of Seligman
since January 1999, co-manages the Fund. Mr. Collins joined Seligman in 1992 as
an Investment Associate, and was named a Vice President, Investment Officer in
January 1995. 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., and Tri-Continental
Corporation.

                                       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 domestic or foreign exchanges, markets, depositories, clearing
agencies, or governments 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 its
ongoing 12b-1 fees may differ from other Classes. 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.
  .Certain employer-sponsored defined contribution-type plans can purchase
  shares with no initial sales charge.

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
   <S>                                   <C>  invest $250,000 or more, you
   Less than 1 year                        5% will pay less in fees and
   1 year or more but less than 2 years    4  charges if you buy another
   2 years or more but less than 3            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 when you sell shares purchased with reinvested dividends or capital
  gain distributions.

                                       7
<PAGE>

Class C
  . Initial sales charge on Fund purchases, as set forth below:
<TABLE>
<CAPTION>
                                                              Regular Dealer
                            Sales Charge       Sales Charge      Discount
   Amount of your              as a %          as a % of Net    as a % of
   Investment          of Offering Price(/1/) Amount Invested Offering Price
   --------------      ---------------------- --------------- --------------
   <S>                 <C>                    <C>             <C>
   Less than $100,000           1.00%              1.01%           1.00%
   $100,000--$249,999           0.50               0.50            0.50
   $250,000--
    $1,000,000(/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/) Your purchase of Class C shares must be for less than $1,000,000
        because if you invest $1,000,000 or more you will pay less in fees
        and charges if you buy Class A shares.
  . A 1% CDSC on shares sold within eighteen months 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 when you sell shares purchased with reinvested dividends or
    capital gain distributions.

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 when you sell shares purchased with reinvested dividends or
    capital gain distributions.

  * Class D shares are not available to all investors. Beginning June 1,
    1999, you may purchase Class D share only if (1) you already own Class D
    shares of the Fund or another Seligman mutual fund. (2) if your financial
    advisor of record maintains an omnibus account at SDC, or (3) pursuant to
    a 401(k) or other retirement plan program for which Class D shares are
    already available or for which the sponsor requests Class D shares
    because the sales charge structure of Class D shares is comparable to the
    sales charge structure of the other funds offered under the program.

Because the Fund's 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, Class C, 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 the 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 and Class C
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, Class C, and Class D shares will generally be
 Class.                 lower than the NAV of Class A shares of the Fund.

                        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 or lower
minimum investments. Ask your financial advisor if any of these programs apply
to you. Class D shares are not available to all investors. For more
information, see "Deciding Which Class of Shares to Buy--Class D."

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.

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 purchase, and any subsequent
transactions in your account. You will also be sent quarterly and annual
statements detailing your transactions in the Fund and the other Seligman funds
you own under the same account number. 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.

 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.

                                       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. Subsequent investments must be for
$100 or more.

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. Unless you
indicate otherwise, your investment will be made in the Class you already own.
Send investment checks to:
      Seligman Data Corp.
      P.O. Box 9766
      Providence, RI 02940-9766

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 or Class C
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 Among 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
or Class C shares of Seligman Cash Management Fund to buy shares of the same
Class 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). You should read and understand a fund's
prospectus before investing. Some funds may not offer all Classes of shares.

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 sell shares to the Fund through a broker/dealer or your financial
advisor. The Fund does not charge any fees or expenses, other than any
applicable CDSC for this transaction; however, the dealer or financial advisor
may charge a service fee. Contact your financial advisor for more information.

You may always send a written request to sell Fund shares; however, it may take
longer to get your money.

As an additional measure to protect you and the Fund, SDC may confirm written
redemption requests that are (1) for $25,000 or more, or (2) directed to be
paid to an alternate payee or sent to an address other than the address of
record, with you or your financial advisor by telephone before sending you your
money. This will not affect the date on which your redemption request is
actually processed.

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 dollar 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, Class C, or
Class D shares and reinvest your dividends and capital gain distributions, you
may withdraw 12%, 10%, 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 (which may
require a signature guarantee).

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 quarterly
and distributes net capital gains realized on investments annually.

                         You may elect to:


                         (1) reinvest both dividends and capital gain
 Dividend:                   distributions;

                         (2) receive dividends in cash and reinvest capital
 A payment by a              gain distributions; or
 mutual fund,
 usually derived
 from the fund's
 net investment
 income
 (dividends and
 interest earned
 on portfolio
 securities less
 expenses).

                         (3) receive both dividends and capital gain
                             distributions in cash.

                         Your dividends and capital gain distributions will be
                         reinvested if you do not instruct otherwise or if you
                         own Fund shares in a Seligman tax-deferred retirement
                         plan.

                         If you want to change your election, you may write SDC
                         at the address listed on the back cover of this
                         prospectus or, if you have telephone services, you or
                         your financial advisor may call SDC. Your request must
                         be received by SDC before the record date to be
                         effective for that dividend or capital gain
                         distribution.

 Capital Gain Distribution:
 A payment to
 mutual fund
 shareholders
 which
 represents
 profits
 realized on the
 sale of
 securities in a
 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
                         deposited into your predesignated bank account within
                         3-4 business days from the payable date.

                         Dividends and capital gain distributions are
                         reinvested to buy additional Fund shares on the
                         payable date using the NAV of the ex-dividend date.

 Ex-dividend Date:       Dividends on Class B, Class C, and Class D shares will
 The day on              be lower than the dividends on Class A shares as a
 which any               result of their higher 12b-1 fees. Capital gain
 declared                distributions will be paid in the same amount for each
 distributions           Class.
 (dividends or
 capital gains)
 are deducted
 from a fund's
 assets before
 it calculates
 its NAV.

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.

Dividends paid by the Fund are taxable to you as ordinary income. 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 the financial performance
of the Fund's Classes for the past five years or, if less than five years, the
period of the Class's operations. Class C is a new Class, effective June 1,
1999, so financial highlights are not available. 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.
Deloitte & Touche LLP, 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)...................  $35,073  $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.......................   $15.89   $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       3.00    (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    (0.44)

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

                                  June 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 Seligman Common Stock Fund,
Inc., dated June 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.................................   7
          Control Persons and Principal Holders of Securities....  12
          Investment Advisory and Other Services.................  12
          Brokerage Allocation and Other Practices...............  18
          Capital Stock and Other Securities.....................  19
          Purchase, Redemption, and Pricing of Shares............  20
          Taxation of the Fund...................................  25
          Underwriters...........................................  26
          Calculation of Performance Data........................  28
          Financial Statements...................................  30
          General Information....................................  30
          Appendix...............................................  31

EQCS1A
<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 either directly or through
American Depositary Receipts (ADRs), European Depositary Receipts (EDRs), or
Global Depositary Receipts (GDRs) (collectively, Depositary Receipts) in other
securities of foreign issuers.  Foreign investments may be affected favorably or
unfavorably by changes in currency rates and exchange control regulations.
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 the
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.

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.

                                       2
<PAGE>

Forward Foreign Currency Exchange Contracts.  The investment manager will
consider changes in exchange rates in making investment decisions.  As one way
of managing exchange rate risk, the Fund may enter into forward currency
exchange contracts.  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 these contracts to fix the US dollar value of a security that 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.

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
US 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 investment 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 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, having a value at least equal at all times to the amount of such
excess.  Under normal circumstances, consideration of the prospect for currency
parities 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.

                                       3
<PAGE>

If the Fund retains the portfolio security and engages in an offsetting
transaction, 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 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.

Although the Fund will seek to benefit by using forward contracts, anticipated
currency movements may not be accurately predicted and the Fund may therefore
incur a gain or loss on a forward contract.  A forward contract may help reduce
the Fund's losses on securities denominated in a hedged currency, but it may
also reduce the potential gain on the securities which might result from an
increase in the value of that currency.

Investors 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 or
"spread" based on the difference 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.

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.  As a matter of
fundamental policy, 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 so
invested.

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 (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.

                                       4
<PAGE>

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.

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 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 lose 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 is
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 not 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;

                                       5
<PAGE>

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

In an attempt to respond to adverse market, economic, political, or other
conditions, the Fund may invest up to 100% of its assets in cash or cash
equivalents, 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 cash equivalents will be limited
to those that, in the opinion of the investment manager, equate generally to the
standards established for US cash equivalents.  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 93.67% 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                   Position(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,
            (61)              Board, Chief Executive Officer   Chairman and Chief Executive Officer, the Seligman
                              and Chairman of the Executive    Group of investment companies; Chairman, Seligman
                              Committee                        Advisors, Inc., Seligman Services, Inc., and Carbo
                                                               Ceramics Inc., ceramic proppants for oil and gas
                                                               industry; and Director, Seligman Data Corp.,
                                                               Kerr-McGee Corporation, diversified energy company.
                                                               Formerly, Director, Daniel Industries Inc.,
                                                               manufacturer of oil and gas metering equipment.

       Brian T. Zino*         Director, President and Member   Director and President, J. & W. Seligman & Co.
            (46)              of the Executive Committee       Incorporated; President (with the exception of
                                                               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.; Member of the Board
                                                               of Governors of the Investment Company Institute;
                                                               and Director, ICI Mutual Insurance Company, Seligman
                                                               Advisors, Inc., and Seligman Services, Inc.

</TABLE>

                                       7
<PAGE>

<TABLE>
<CAPTION>
           Name,                                                                     Principal
         (Age) and                   Position(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 (except Seligman Cash Management Fund,
                                                              Inc.); 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 Emeritus, American
      Packard Avenue,                                         Council on Germany; Governor of the Center for
     Medford, MA  02155                                       Creative Leadership; Director; Raytheon Co.,
                                                              electronics; National Defense University; and the
                                                              Institute for Defense Analyses.  Formerly, Director,
                                                              USLIFE Corporation, life insurance; 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
            (64)                                              or Trustee, the Seligman Group of investment
    18 Highland Circle,                                       companies; Trustee, the Committee for Economic
   Bronxville, NY  10708                                      Development; and Chairman, The Rockefeller
                                                              Foundation, charitable foundation.  Formerly,
                                                              Trustee, The Markle Foundation, philanthropic
                                                              organization; and Director, New York Telephone
                                                              Company; and International Research and Exchange
                                                              Board, intellectual exchanges.

     Frank A. McPherson                  Director             Retired Chairman and Chief Executive Officer of
            (66)                                              Kerr-McGee Corporation; Director or Trustee, the
 2601 Northwest Expressway,                                   Seligman Group of investment companies; Director,
          Suite 805E                                          Kimberly-Clark Corporation, consumer products; Bank
  Oklahoma City, OK  73112                                    of 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.
</TABLE>

                                       8
<PAGE>

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

<S>                           <C>                              <C>
       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.
       P.O. Box 449,                                           Dodge Foundation, charitable foundation; and
    Gladstone, NJ  07934                                       Chairman of 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                                       investment companies.  Formerly, Director, Public
 County, P.O. Box 1945,                                        Service Enterprise Group, public utility.
 Morristown, NJ  07962

      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
</TABLE>

                                       9
<PAGE>

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

<S>                           <C>                              <C>
      James N. Whitson                   Director              Director and Consultant, Sammons Enterprises, Inc.;
            (64)                                               Director or Trustee, the Seligman Group of
  6606 Forestshire Drive,                                      investment companies; Director, C-SPAN and
     Dallas, TX  75230                                         CommScope, Inc., 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
            (42)              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.; Vice President and Treasurer,
                                                               Seligman International, 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.,
                                                               Seligman International, Inc. and Seligman Data Corp.

       Thomas G. Rose                    Treasurer             Treasurer, the Seligman Group of investment
            (41)                                               companies and Seligman Data Corp.
</TABLE>

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.

                                       10
<PAGE>

<TABLE>
<CAPTION>

Compensation

                                                                 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                      1,803              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 (including earnings) 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 the Seligman Group of
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.

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.

                                       11
<PAGE>

              Control Persons and Principal Holders of Securities

Control Persons

As of May 14, 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 May 14, 1999, 21.54% of the Fund's Class B capital stock then outstanding
and 16.20% of the Fund's Class D capital stock then outstanding were owned of
record by MLPF&S 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 May 14, 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, .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 $5,594,520, equal
to .65% 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 of $89,387 to Seligman Henderson Co.

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 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

                                       12
<PAGE>

Fund not employed by or serving as a Director of Seligman 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 Seligman 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
Seligman 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, 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
employees are also required to disclose all securities beneficially owned by
them on December 31 of each year.

                                       13
<PAGE>

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 and Class C shares of the Fund, as set forth below:

Class A shares:
- ---------------

<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>


Class C shares:
- ---------------

<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 $100,000                     1.00%                      1.01%                       1.00%
$100,000  -  $249,999                  0.50                       0.50                        0.50
$250,000  -  $1,000,000(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)  Your purchase of Class C shares must be for less than $1,000,000 because if
     you invest $1,000,000 or more, you  will pay less in fees and charges if
     you buy Class A shares.

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
$25,939, $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, Class C, 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 are 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 during the quarter in which such
expenses are incurred, 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

                                       15
<PAGE>

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
$1,818,756, equivalent to .24% per annum of the average daily net assets of
Class A shares.

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 Class B shares (i) a 4%
sales commission to Service Organizations 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 $276,947,
equivalent to 1% per annum of the average daily net assets of Class B
shares.

Class C
- -------

Under the 12b-1 Plan, the Fund, with respect to Class C 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 C shares.  The fee is used by Seligman Advisors as
follows: During the first year following the sale of Class C shares, a
distribution fee of .75% of the average daily net assets attributable to Class C
shares is used, along with any CDSC proceeds during the first eighteen months,
to (1) reimburse Seligman Advisors for its payment at the time of sale of Class
C shares of a 1.25% 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 C shares, a service fee of up to .25% of the average daily net assets
attributable to such Class C shares is used to reimburse Seligman Advisors for
its prepayment to Service Organizations at the time of sale of Class C shares of
a service fee of .25% of the net asset value of the Class C share sold (for
shareholder services to be provided to Class C shareholders over the course of
the one year immediately following the sale).  The payment of service fees 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 C shares, the entire 12b-1 fee
attributable to such Class C shares is paid to Service Organizations for
providing continuing shareholder services and distribution assistance in respect
of the Fund.  The Fund did not pay any 12b-1 fees in respect of Class C shares
for the fiscal year ended September 30, 1998 because no Class C shares were
issued or outstanding during such period.

                                       16
<PAGE>

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 such
Class D shares 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 .25% of the net asset value of the Class D shares sold (for shareholder
services to be provided to Class D shareholders over the course of the one year
immediately following the sale).  The payment of service fees 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 the Fund.  The
total amount paid by the Fund in respect of Class D shares for the year ended
December 31, 1998 was $828,406, equivalent to 1% 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 $173,261 of unreimbursed
expenses in respect of the Fund's Class D shares.  This amount is equal to .20%
of the net assets of Class D shares at December 31, 1998.

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

Payments made by the Fund under the 12b-1 Plan for its year ended December 31,
1998, were spent on the following activities in the following amounts (no Class
C shares were outstanding during such fiscal year):

<TABLE>
<CAPTION>
                                                        Class A         Class B         Class D
                                                        -------         -------         -------

<S>                                                     <C>             <C>             <C>
Compensation to underwriters                                   ---              ---       $101,725

Compensation to broker/dealers                          $1,818,756         $ 27,764       $726,681

Other*                                                         ---         $249,183            ---
</TABLE>
* 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 12b-1 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

                                       17
<PAGE>


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 was approved in respect of the
Class C shares on May 20, 1999 by the Directors, including a majority of the
Qualified Directors, and became effective in respect of the Class C shares on
June 1, 1999. 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 $459,344, $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 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 $2,078,069, $2,439,633 and $1,374,513, respectively.  The
amount of brokerage commissions paid by the Fund has increased materially from
1996 due to an increase in portfolio turnover.  The increase in portfolio
turnover was due to a realignment of the Fund which decreased its convertible
debt holdings and increased its holdings in common stock.

                                       18
<PAGE>

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 capital stock, each with a
par value of $0.50, divided into four classes, designated Class A common stock,
Class B common stock, Class C common stock, and Class D common stock.  Each
share of the Fund's Class A, Class B, Class C, 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 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.

                                       19
<PAGE>

                  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 under
"Persons Entitled to Reductions") 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.

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.

                                       20
<PAGE>

  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.  Section 403(b) plans
sponsored by public educational institutions are not eligible for net asset
value purchases based on the aggregate investment made by the plan or number of
eligible employees.

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 in the following instances:

(1)  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;

(2)  to separate accounts established and maintained by an insurance company
     which are exempt from registration under Section 3(c)(11) of the 1940 Act;

(3)  to registered representatives and employees (and their spouses and minor
     children) of any dealer that has a sales agreement with Seligman Advisors;

(4)  to financial institution trust departments;

(5)  to registered investment advisers exercising discretionary investment
     authority with respect to the purchase of Fund shares;

(6)  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;

(7)  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;

(8)  to other investment companies in the Seligman Group in connection with a
     deferred fee arrangement for outside directors;

(10) to those partners and employees of outside counsel to the Fund or its
     directors or trustees who regularly provide advice and services to the
     Fund, to other funds managed by Seligman, or to their directors or
     trustees; and

(11) in connection with sales pursuant to a 401(k) alliance program which has an
     agreement with
     Seligman Advisors.

CDSC Applicable to Class A Shares.  Class A shares purchased without an initial
sales charge due to a purchase of $1,000,000 or more either alone or through 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

                                       21
<PAGE>

purchase. Employee benefit plans eligible for net asset value sales 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
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.

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. 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 Seligman mutual fund from which the
exchange has been made.

Class C
- -------

Class C shares may be purchased at a price equal to the next determined net
asset value, plus an initial sales charge.  Purchases of Class C shares by a
"single person" may be eligible for the reductions in initial sales charges
described above for Class A shares.  Class C shares are subject to a CDSC of 1%
if the shares are redeemed within eighteen months of purchase, charges as a
percentage of the current net asset value or the original purchase price,
whichever is less.

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.  Unlike Class B shares, Class D shares do not
automatically convert to Class A shares after eight years.

                                       22
<PAGE>


Systematic Withdrawals.  Class B, Class C, and Class D shareholders who reinvest
both their dividends and capital gain distributions to purchase additional
shares of the Fund may use the Systematic Withdrawal Plan to withdraw up to 12%,
10%, 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, Class C, 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 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, Class C, 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 and Class C 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.

                                       23
<PAGE>


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 and Class C
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 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, Class C, 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 sales 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 60 days remaining to maturity
are generally valued at amortized cost.  Short-term obligations with more than
60 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 and Class C shares are sold with a maximum initial
sales charge of 4.75% and 1.00%(1), respectively, and Class B and Class D shares
are sold at NAV(2). Using each Class's NAV at December 31, 1998, (except Class C
shares, which commences operations effective June 1, 1999) the maximum offering
price of the Fund's shares is as follows:

                                       24
<PAGE>

<TABLE>
<CAPTION>

Class A
- -------
<S>                                                              <C>
  Net asset value per share........................              $15.77
                                                                 ------

  Maximum sales charge (4.75% of offering price)...                 .79
                                                                    ---

  Offering price to public.........................              $16.56
                                                                 ======

Class B
- -------
  Net asset value and offering price per share(2)..  ..........  $15.71
                                                                 ======

Class D
- -------
  Net asset value and offering price per share(2)..  ..........  $15.73
                                                                 ======
- --------------
</TABLE>
(1) In addition to the front-end sales charge of 1.00%, Class C shares is
    subject to a 1% CDSC if you redeem your shares within eighteen months of
    purchase.

(2) 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 also subject to a
    1% CDSC if you redeem your shares within one year of purchase.

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

                                       25
<PAGE>

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.

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
shareholders on the 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 capital 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 initial sales charges paid by shareholders of Class A shares of the Fund
for the years ended December 31, 1998, 1997 and 1996, amounted to $508,356,
$578,570 and $900,149, respectively, of which $58,596, $65,673 and $102,883,
respectively, was retained by Seligman Advisors.  No Class C shares of the Fund
were issued or outstanding during such fiscal years.

                                       26
<PAGE>

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 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 Class            Brokerage                      Other
     Charge Retained)               D Retained)                  Commissions                Compensation (1)
     ----------------               -----------                  -----------                ----------------

<S>                         <C>                                  <C>                        <C>
         $58,596                      $17,980                         $0                         $16,073
</TABLE>

(1) Seligman Advisors has sold its rights to collect the distribution fees paid
    by the Fund in respect of Class B shares and 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.

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.

                                       27
<PAGE>

                        Calculation of Performance Data

The average annual total returns for the Fund's Class A shares for the one-,
five-, 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 $4,045 on December 31, 1998,
resulting in an aggregate total return of 304.46%.

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 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 $1,529 on
December 31, 1998, resulting in an aggregate total return of 52.95%.

The average annual total returns for the Fund's Class D shares for the one- 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 $2,199 on December 31, 1998, resulting in an
aggregate total return of 119.90%.

Class C shares are a new class, effective June 1, 1999, so no performance data
is presented.

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                $1,032                $  140              $ 36               $1,208
12/31/90                   894                   197                70                1,161
12/31/91                 1,057                   323               128                1,508
12/31/92                 1,078                   416               178                1,672
12/31/93                 1,136                   547               238                1,921
12/31/94                 1,022                   598               264                1,884
12/31/95                 1,196                   851               368                2,415
12/31/96                 1,255                 1,087               446                2,788
12/31/97                 1,342                 1,566               537                3,445
12/31/98                 1,330                 2,118               597                4,045                 304.46%
</TABLE>

                                       28
<PAGE>

                               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             1,073                   239                27                1,339
    12/31/98             1,031                   457                41                1,529                  52.95%
</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                   583               107                1,887
    12/31/98             1,184                   888               127                2,199                 119.90%
</TABLE>
_________________________
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 because the 12b-1 Plan was implemented on January 1, 1993.  The
total returns and average annual total 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 Services, 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, Class C, 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

                                       29
<PAGE>

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.

                              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.

                                       30
<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

 .  Helps finance America's fledgling railroads through underwritings.
 .  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.
 .  Becomes a prominent underwriter of corporate securities, including New York
   Mutual Gas Light Company, later part of Consolidated Edison.
 .  Provides financial assistance to Mary Todd Lincoln and urges the Senate to
   award her a pension.
 .  Is appointed U.S. Navy fiscal agent by President Grant.
 .  Becomes a leader in raising capital for America's industrial and urban
   development.

 ...1900-1910

 .  Helps Congress finance the building of the Panama Canal.

 ...1910s

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

 ...1920s

 .  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.

 .  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

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

                                       31
<PAGE>

 ...1940s

 .  Helps shape the Investment Company Act of 1940.
 .  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.
 .  Assumes management of National Investors Corporation, today Seligman Growth
   Fund, Inc.
 .  Establishes Whitehall Fund, Inc., today Seligman Income Fund, Inc.

 ...1950-1989

 .  Develops new open-end investment companies.  Today, manages more than 50
   mutual fund portfolios.
 .  Helps pioneer state-specific municipal bond funds, today managing a national
   and 18 state-specific municipal funds.
 .  Establishes J. & W. Seligman Trust Company and J. & W. Seligman Valuations
   Corporation.
 .  Establishes Seligman Portfolios, Inc., an investment vehicle offered through
   variable annuity products.

 ...1990s

 .  Introduces Seligman Select Municipal Fund, Inc. and Seligman Quality
   Municipal Fund, Inc. two closed-end funds that invest in high quality
   municipal bonds.
 .  In 1991 establishes a joint venture with Henderson plc, of London, known as
   Seligman Henderson Co., to offer global investment products.
 .  Introduces to the public Seligman Frontier Fund, Inc., a small capitalization
   mutual fund.
 .  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.
 .  Launches Seligman Value Fund Series, Inc., which currently offers two
   separate series: Seligman Large-Cap Value Fund and Seligman Small-Cap Value
   Fund.



SAICSB699

                                       32
<PAGE>

                                      SELIGMAN
                                --------------
                                  COMMON STOCK
                                    FUND, INC.


                                    [GRAPHIC]


                                  ANNUAL REPORT
                                DECEMBER 31, 1998

                                     ------

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


                                     [LOGO]

                             J. & W. SELIGMAN & CO.
                                  INCORPORATED
                                ESTABLISHED 1864
<PAGE>

SELIGMAN -- TIMES CHANGE...VALUES ENDURE

J. & W. Seligman & Co. Incorporated is a firm with a long tradition of
investment expertise, offering a broad array of investment choices to help
today's investors seek their long-term financial goals.


[PHOTOGRAPH]
James, Jesse, and Joseph Seligman, 1870


TIMES CHANGE...

Established in 1864, Seligman's history of providing financial services has been
marked not by fanfare, but rather by a quiet and firm adherence to financial
prudence. While the world has changed dramatically in the 134 years since
Seligman first opened its doors, the firm has continued to offer its clients
high-quality investment solutions through changing times.

In the late 19th century, as the country grew, Seligman helped finance the
westward expansion of the railroads, the construction of the Panama Canal, and
the launching of urban transit systems. In the first part of the 20th century,
as America became an industrial power, the firm helped fund the growing capital
needs of the nascent automobile and steel industries.

With the formation of Tri-Continental Corporation in 1929 -- today, the nation's
largest diversified publicly-traded closed-end investment company -- Seligman
began shifting its emphasis from investment banking to investment management.
Despite the stock market crash and ensuing depression, Seligman was convinced of
the importance that investment companies could have in building wealth for
individual investors and began managing its first mutual fund in 1930.

In the decades that followed, Seligman has continued to offer forward-looking
investment solutions, including funds that focus on technology stocks, municipal
bonds, and international securities.


 ...VALUES ENDURE

Seligman is proud of its distinctive past and of the traditional values that
continue to shape the firm's business decisions and investment judgment. While
much has changed over the years, the firm's commitment to providing prudent
investment management that seeks to build wealth for clients over time is an
enduring value that will guide Seligman into the new millennium.


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

TABLE OF CONTENTS

To the Shareholders ..................................   1
Interview With Your Portfolio Managers ...............   2
Performance Overview .................................   4
Portfolio Overview ...................................   6
Portfolio of Investments .............................   8
Statement of Assets and Liabilities ..................  11
Statement of Operations ..............................  12
Statements of Changes in Net Assets ..................  13

Notes to Financial Statements ........................  14
Financial Highlights .................................  17
Report of Independent Auditors .......................  19
Federal Tax Status of 1998 Dividend and
  Gain Distributions for Taxable Accounts ............  20
Board of Directors ...................................  21
Executive Officers and For More Information ..........  22
Glossary of Financial Terms ..........................  23

- --------------------------------------------------------------------------------
<PAGE>

TO THE SHAREHOLDERS

Seligman Common Stock Fund had a solid year in 1998, posting a total return of
17.40% based on the net asset value of Class A shares. This return outpaced the
15.32% total return of the Fund's peers, as measured by the Lipper Growth &
Income Funds Average. The Fund's return lagged the 28.58% total return of the
Standard & Poor's 500 Composite Stock Price Index (S&P 500). A discussion with
your Portfolio Managers regarding the Fund's results begins on page 2.

The past year was one of continued growth in the US
economy, with real domestic growth of 3.9%, marking the eighth year of economic
expansion. The US large-cap sector of the equity markets responded with another
year of strong performance. 1998 marked the first time in history that the S&P
500 registered more than 20% gains four years in a row. But, despite the strong
year-end numbers, 1998 was the most volatile year for the markets since 1987.

Once again in 1998, exceptional performance from an extremely narrow list of
stocks masked the true investment results in the broad market. Within the S&P
500, the successes of a few stocks blurred the total picture. In fact, 197
stocks within the S&P 500, representing 39% of the Index, actually lost market
value during the last 12 months. Investment results between asset classes were
also more widely dispersed than usual.

The market's volatility can be attributed to a number of factors -- some
domestic, many international. The international economic background in 1998 was
one of steadily deteriorating conditions as the financial crisis, originally
limited to a few Asian countries, spread throughout other regions. Currency
instability and rising global recession/deflation fears exacerbated market
volatility. Anxiety increased following the Russian debt default and the
near-collapse of Long-Term Capital Management LP, a large hedge fund plagued by
a series of bad currency investments. By late August, a stock market correction
threatened to turn into a more significant decline, as the Dow Jones Industrial
Average fell more than 850 points in two days, wiping out all of the year's
gains.

During the second half of the year, the Federal Reserve Board cut the
federal-funds rate three times. These actions confirmed the Fed's resolve to
protect the US economy from the global financial crisis and markets responded
favorably throughout November and December.

Subdued inflation, low interest rates, improving prospects in Asia, and a
Federal Reserve leading the fight against global recession are all positive for
the US markets in 1999. We expect a challenging environment confronted with
economic uncertainties and continued high volatility. Pressure on corporate
profits is likely to continue as the US enters a period of slower growth.
Valuations on some of the largest stocks seem excessive, and any broadening of
the market in 1999 may negatively affect their share prices. In addition, low
commodity prices are impacting much of the world, making it harder for US
multinationals to export. Nonetheless, we see moderately positive returns for
the year in line with our lower growth projections.

Seligman continues to work to ensure that all of its operations are prepared for
the challenges posed by the Year 2000 (Y2K) computer problem. We are confident
that there will be no disruption in the investment and shareholder services
provided by your Fund as a result of Y2K. In addition, your portfolio management
team considers the potential ramifications of Y2K when making decisions on which
securities should be held by the Fund.

Thank you for your continued support of Seligman Common Stock Fund in 1998. we
look forward to serving your investment needs in 1999.

By order of the Board of Directors,



/s/ William Morris
William C. Morris
Chairman
                                 /s/Brian T. Zino
                                 Brian T. Zino
                                 President

January 29, 1999


                                       1
<PAGE>

INTERVIEW WITH YOUR PORTFOLIO MANAGERS,
CHARLES C. SMITH, JR. AND RODNEY COLLINS


Q.   How did Seligman Common Stock Fund perform in the last 12 months?

A.   For the 12 months ended December 31, 1998, Seligman Common Stock Fund
     posted a total return of 17.40% based on the net asset value of Class A
     shares. The Lipper Growth & Income Funds Average, which measures the
     results of mutual funds with similar investment objectives, had a total
     return of 15.32% through December 31, 1998. The Standard & Poor's 500
     Composite Stock Price Index (S&P 500) had a total return of 28.58% for
     1998.

Q.   Which economic and market factors affected the Fund's investment results in
     1998?

A.   In 1998, the US economy expanded for the eighth year in a row. Low
     inflation, continued corporate earnings growth, and a benign interest rate
     environment all helped propel the major US markets higher. The year was one
     of tremendous investor demand for US common stocks. Much of this demand was
     caused by the continuing "flight to quality," as investors tried to
     insulate themselves from troubles in Asia and Latin America by investing in
     the largest, most liquid companies in the US. This trend, while positive
     for the biggest stocks in the US, caused a narrowing of the market that
     left many stocks behind. In fact, 50 stocks in the S&P 500 accounted for
     about 94% of the performance of the entire Index.

     Seligman Common Stock Fund benefited from the strong demand for US
     large-cap stocks. But market performance in 1998 was far from a straight
     line that moved continually higher. In the third quarter of the year, the
     market weakened significantly. Your Fund did well during this downturn
     because of our strategy of emphasizing companies with attractive dividend
     yields relative to the market and attractive valuations relative to their
     industries.

Q.   What is your investment strategy?

A.   In an effort to reduce overall volatility, we have repositioned the Fund's
     portfolio to emphasize companies with greater earnings stability. While
     still diversified among industry groups and individual holdings, the
     portfolio has been pared down to focus on companies with dividend yields
     equal to, or greater than, the S&P 500. Valuations of the companies we
     invest in must be at the lower end of their industry group. Our investment
     approach led us to be underweight in many of the excessively valued
     large-capitalization stocks that were hit the hardest by last summer's
     market downturn. This allowed Seligman Common Stock Fund to outpace the
     market and many of its peers in that difficult environment.

     Our investment strategy continued to offer a significant yield advantage
     and less investment risk than offered by our average competitor. In fact,
     1998

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

A TEAM APPROACH

Seligman Common Stock Fund is managed by the Seligman Growth and Income Team,
headed by Charles C. Smith, Jr. Mr. Smith and Rodney Collins are assisted in the
management of the Fund by seasoned research professionals who are responsible
for identifying companies in specific industry groups that offer the greatest
total return potential, consistent with the Fund's objective.

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


[PHOTOGRAPH]
Growth and Income Team: (standing, from left) Amy Fujii, John Roth, Melanie
Ravenell (Administrative Assistant), (seated) Charles Smith (Portfolio Manager),
Rodney Collins (Co-Portfolio Manager)


                                       2
<PAGE>

INTERVIEW WITH YOUR PORTFOLIO MANAGERS,
CHARLES C. SMITH, JR. AND RODNEY COLLINS


     marked the 55th consecutive year that Seligman Common Stock Fund was able
     to increase its dividend income for shareholders who invested their capital
     gains in additional shares. It is the only mutual fund in the nation that
     can boast such a record. In uncertain markets, dividends can significantly
     reduce volatility.

Q.   How was the portfolio constructed, and how did that affect investment
     results ?

A.   In 1998, we significantly reduced the Fund's international holdings. With
     continued problems in the global economy, we felt that the US market
     offered greater return potential. The international stocks we still hold in
     the portfolio are large, liquid companies, which we believe have attractive
     fundamentals. Sectors that produced strong returns for the Fund included
     health care, telecommunications, and capital goods. The weakest area of the
     portfolio was cyclical stocks. While we generally underweighted these
     issues, they did negatively impact results.

     The most significant factor that held performance down was our
     underweighting in technology stocks. Successful technology companies
     usually need to reinvest any earnings to finance research and development
     and future growth plans. This means that they rarely distribute dividends.
     Since one of Seligman Common Stock Fund's primary investment strategies is
     to invest in companies with dividends comparable to, if not higher than,
     the overall market, we did not own most of the fastest-growing technology
     stocks. Our lack of significant technology exposure (it makes up about 10%
     of the portfolio) helped the Fund during the market sell-off that started
     in late July, but it hampered overall performance as these same technology
     companies rallied strongly in the fourth quarter.

Q.   What is your outlook?

A.   We continue to believe that the US economy offers an attractive environment
     for investing in common stocks. At the same time, we remain cautious, as
     the valuations of many of the larger stocks seem to already reflect a
     positive economic outlook. As a result, we continue to temper our positions
     in some of the larger-capitalization stocks -- the top 20 names in the S&P
     500. We feel that the high valuations accorded to many of these stocks have
     been driven by liquidity concerns, not fundamentals. Therefore, we are
     focusing on identifying companies whose valuations more fully reflect their
     future prospects, and where there is a catalyst for earnings acceleration
     going forward. Any broadening of the market should benefit these companies
     in the next year and beyond.

     We believe that difficulties in world markets are likely to continue to
     have an impact on US stocks in 1999, and that volatility, which was an
     ever-present market factor last year, will not subside quickly. In such an
     environment, Seligman Common Stock Fund will continue to adhere to its
     disciplined investment strategy based on fundamental analysis.



                                       3
<PAGE>

PERFORMANCE OVERVIEW

     This chart compares a $10,000 hypothetical investment made in Seligman
Common Stock Fund Class A shares, with and without the initial 4.75% maximum
sales charge, and assumes that all distributions within the period are invested
in additional shares, for the 10-year period ended December 31, 1998, to a
$10,000 investment made in the Lipper Growth &Income Funds Average (Lipper
Growth &Income Average) and the Standard &Poor's 500 Composite Stock Price Index
(S&P 500) for the same period. The performances of Seligman Common Stock Fund
Class B and Class D shares are not shown in this chart but are included in the
table on page 5. It is important to keep in mind that the Lipper Growth &Income
Average and the S&P500 exclude the effect of fees and/or sales charges.


  [THE FOLLOWING TABLE WAS PRESENTED AS A LINE CHART IN THE PRINTED MATERIAL.]


                       Seligman Common Stock Fund Class A

                                            LIPPER
                 WITH          WITHOUT      GROWTH &
                 SALES         SALES        INCOME         S&P
                 CHARGE        CHARGE       AVERAGE        500
                 ------        ------       ------       ------
  12/31/88        9,528        10,000       10,000       10,000
   3/31/89       10,077        10,577       10,644       10,709
   6/30/89       10,662        11,191       11,396       11,655
   9/30/89       11,710        12,290       12,387       12,903
  12/31/89       12,079        12,677       12,382       13,169
   3/31/90       11,961        12,554       12,074       12,772
   6/30/90       12,707        13,337       12,291       13,576
   9/30/90       10,491        11,011       11,013       11,710
  12/31/90       11,609        12,184       11,825       12,760
   3/31/91       13,515        14,184       13,511       14,614
   6/30/91       13,238        13,894       13,485       14,580
   9/30/91       14,261        14,968       14,238       15,360
  12/31/91       15,084        15,831       15,254       16,647
   3/31/92       15,336        16,096       15,271       16,226
   6/30/92       15,434        16,199       15,317       16,534
   9/30/92       15,861        16,647       15,692       17,055
  12/31/92       16,722        17,551       16,639       17,913
   3/31/93       17,533        18,402       17,426       18,696
   6/30/93       17,955        18,845       17,587       18,787
   9/30/93       18,406        19,319       18,207       19,272
  12/31/93       19,206        20,158       18,641       19,719
   3/31/94       18,304        19,211       18,064       18,972
   6/30/94       18,401        19,313       18,006       19,051
   9/30/94       19,124        20,072       18,768       19,983
  12/31/94       18,843        19,777       18,485       19,979
   3/31/95       20,446        21,460       19,990       21,925
   6/30/95       21,933        23,020       21,593       24,019
   9/30/95       23,319        24,475       23,178       25,928
  12/31/95       24,151        25,348       24,309       27,489
   3/31/96       25,376        26,634       25,730       28,965
   6/30/96       26,274        27,576       26,619       30,266
   9/30/96       26,486        27,798       27,408       31,201
  12/31/96       27,880        29,261       29,502       33,803
   3/31/97       28,306        29,709       29,844       34,709
   6/30/97       32,671        34,290       34,142       40,770
   9/30/97       34,893        36,622       37,193       43,823
  12/31/97       34,453        36,160       37,482       45,082
   3/31/98       38,433        40,338       41,854       51,371
   6/30/98       38,317        40,216       41,947       53,066
   9/30/98       35,343        37,094       36,706       47,786
  12/31/98       40,445        42,450       43,224       57,964


     The performances of Class B and D shares will be greater than or less than
the performance shown for Class A shares, based on the differences in sales
charges and fees paid by shareholders.


                                       4
<PAGE>

PERFORMANCE OVERVIEW


Investment Results Per Share

TOTAL RETURNS
For Period Ended December 31, 1998

<TABLE>
<CAPTION>
                                                                                      AVERAGE ANNUAL
                                                              ---------------------------------------------------------------
                                                                                                       CLASS B       CLASS D
                                                                                                        SINCE         SINCE
                                                 SIX            ONE          FIVE           10        INCEPTION     INCEPTION
                                               MONTHS*         YEAR          YEARS         YEARS       4/22/96       5/3/93
                                               -------        -----         ------        ------      ---------     ---------
<S>                                              <C>          <C>           <C>           <C>           <C>           <C>
Class A**
With Sales Charge                                0.52%        11.84%        14.94%        15.00%          n/a           n/a
Without Sales Charge                             5.56         17.40         16.06         15.55           n/a           n/a

Class B**
With CDSC+                                       0.34         11.53           n/a           n/a         17.09%          n/a
Without CDSC                                     5.15         16.48           n/a           n/a         17.94           n/a

Class D**
With 1% CDSC                                     4.25         15.56           n/a           n/a           n/a           n/a
Without CDSC                                     5.22         16.55         15.05           n/a          n/a          14.92%

Lipper Growth & Income Funds Average***          3.04         15.32         18.32         15.76         20.66++       17.73+++

S&P 500***                                       9.22         28.58         24.06         19.21         29.00++       22.63+++
</TABLE>


NET ASSET VALUE

                 DECEMBER 31, 1998       JUNE 30, 1998        DECEMBER 31, 1997
                 -----------------       -------------        -----------------
Class A              $15.77                 $16.36                $15.92
Class B               15.71                  16.31                 15.88
Class D               15.73                  16.32                 15.89


DIVIDEND AND CAPITAL GAIN INFORMATION
For the Year Ended December 31, 1998


                 DIVIDENDS
                   PAID                              CAPITAL GAIN
                   ----                              ------------
Class A           $0.282                Paid                          $2.468#
Class B            0.166                Undistributed Realized         0.191##
Class D            0.166                Unrealized                     4.098###


     Performance data quoted represent changes in price and assume that all
distributions within the periods are invested in additional shares. The rates of
return will vary and the principal value of an investment will fluctuate.
Shares, if redeemed, may be worth more or less than their original cost. Past
performance is not indicative of future investment results.

- ----------
   * Returns for periods of less than one year are not annualized.

  ** Return figures reflect any change in price per share and assume the
     investment of dividend and capital gain distributions. Returns for Class A
     shares are calculated with and without the effect of the initial 4.75%
     maximum sales charge. Returns for Class A shares reflect the effect of the
     service fee of up to 0.25% under the Administration, Shareholder Services
     and Distribution Plan after January 1, 1993, only. Returns for Class B
     shares are calculated with and without the effect of the maximum 5%
     contingent deferred sales charge ("CDSC"), charged on redemptions made
     within one year of the date of purchase, declining to 1% in the sixth year
     and 0% thereafter. Returns for Class D shares are calculated with and
     without the effect of the 1% CDSC, charged on redemptions made within one
     year of the date of purchase.

 *** The Lipper Growth &Income Funds Average and the S&P 500 are unmanaged
     benchmarks that assume investment of dividends. The Lipper Growth &Income
     Funds Average and the S&P 500 exclude the effect of fees and/or sales
     charges. The monthly performance of the Lipper Growth &Income Funds Average
     is used in the Performance Overview. Investors cannot invest directly in an
     index or an average.

   + The CDSC is 5% for periods of one year or less, and 3% since inception.

  ++ From April 30, 1996.

 +++ From April 30, 1993.

   # Includes $1.18 of undistributed realized capital gains from 1997, which
     were paid to shareholders on June 24, 1998.

  ## Represents net gain realized from November and December 1998, payable in
     1999.

 ### Represents the per share amount of net unrealized appreciation of portfolio
     securities as of December 31, 1998.


                                       5
<PAGE>

PORTFOLIO OVERVIEW


Diversification of Net Assets
December 31, 1998

<TABLE>
<CAPTION>
                                                                                                         PERCENT OF NET ASSETS
                                                                                                              DECEMBER 31,
                                                                                                           ------------------
                                                        ISSUES           COST               VALUE          1998          1997
                                                        ------           ----               -----          ----          ----
<S>                                                       <C>        <C>                <C>                <C>           <C>
COMMON STOCKS:
    Aerospace/Defense ...............................      1         $ 3,294,465        $ 4,690,000         0.5           0.9
    Automotive and Related ..........................      3          34,383,919         47,447,812         5.4           3.4
    Basic Materials .................................      1           4,413,475          4,473,750         0.5           0.8
    Business Services and Supplies ..................      2          23,812,859         35,420,000         4.0           0.6
    Capital Goods ...................................      1           8,683,765          7,703,125         0.9            --
    Chemicals .......................................      1           8,216,419          7,694,062         0.9           2.8
    Computer Goods and Services .....................     --                  --                 --          --           3.1
    Construction ....................................     --                  --                 --          --           0.7
    Consumer Goods and Services .....................      3          35,950,412         46,106,562         5.2           5.3
    Drugs and Health Care ...........................      5          46,097,965         69,610,312         7.9           7.8
    Electric and Gas Utilities ......................      5          52,325,457         61,368,126         7.0           3.4
    Electrical Equipment ............................     --                  --                 --          --           0.8
    Electronics .....................................      2          22,352,229         24,765,000         2.8           4.2
    Energy ..........................................      6          74,691,053         89,978,437        10.2           8.8
    Finance and Insurance ...........................     11          94,727,053        157,839,863        17.9          15.7
    Food ............................................      2          15,277,420         31,128,750         3.5           2.9
    Machinery and Industrial Equipment ..............      3          41,127,527         64,168,856         7.3           8.7
    Metals and Mining ...............................     --                  --                 --          --           0.5
    Paper and Packaging .............................      2          17,906,241         20,914,375         2.4           1.9
    Printing and Publishing .........................      1           3,266,337          5,623,750         0.7           0.6
    Retail Trade ....................................      1           9,428,316         12,980,625         1.5           2.1
    Technology ......................................     --                  --                 --          --           1.2
    Telecommunications ..............................      4          61,737,793         86,666,563         9.8           6.7
    Tobacco .........................................      1          23,421,083         29,425,000         3.3           4.0
    Transportation ..................................      1          11,899,967         11,882,813         1.3            --
    Miscellaneous/Diversified .......................      1          10,766,178         12,850,625         1.5           1.5
                                                         ---       -------------      -------------       -----         -----
                                                          57         603,779,933        832,738,406        94.5          88.4
SHORT-TERM HOLDINGS AND OTHER ASSETS
  LESS LIABILITIES                                         2          48,118,555         48,118,555         5.5          11.6
                                                         ---       -------------      -------------       -----         -----
NET ASSETS                                                59        $651,898,488       $880,856,961       100.0         100.0
                                                         ===       =============      =============       =====         =====
</TABLE>


                                       6
<PAGE>

PORTFOLIO OVERVIEW

Largest Portfolio Changes
During Past Six Months


                                           SHARES
                                   ----------------------
                                                 HOLDINGS
ADDITIONS                          INCREASE      12/31/98
- ---------                          --------      --------
Chubb ..........................    140,000       140,000
Crown Cork &Seal ...............    250,000       250,000
DQE ............................    225,000       225,000
Electronic Data Systems ........    200,000       200,000
Ford Motor .....................    175,000       175,000
Fort James .....................    325,000       325,000
Harris .........................    240,000       240,000
Morgan (J.P.) ..................     70,000        70,000
PepsiCo ........................    275,000       275,000
Sonat ..........................    275,000       275,000



                                           SHARES
                                   ----------------------
                                                 HOLDINGS
REDUCTIONS                         DECREASE      12/31/98
- ----------                         --------      --------
Bristol-Myers Squibb ...........     90,000       100,000
Edison International ...........    375,000            --
Exxon ..........................    115,000       295,000
General Electric ...............    135,100       264,900
Marsh & McLennan ...............    270,000            --
Mobil ..........................    150,000       145,000
Penney (J.C.) ..................    160,000            --
St. PaulCompanies ..............    270,000            --
Texaco .........................    260,000            --
US WEST Communications
  Group ........................    320,000            --


Largest portfolio changes from previous period to current period are based on
cost of purchases and proceeds from sales of securities.


Largest Industries
December 31, 1998


   [THE FOLLOWING TABLE WAS PRESENTED AS A BAR CHART IN THE PRINTED MATERIAL.]


                                      Percent of       Total Dollar
                                      Net Assets          Amount
                                      ----------       ------------
FINANCE AND INSURANCE                   17.90%         $157,839,863
ENERGY                                  10.20%         $ 89,978,437
TELECOMMUNICATIONS                       9.80%         $ 86,666,563
DRUGS AND HEALTH CARE                    7.90%         $ 69,610,312
MACHINERY AND INDUSTRIAL EQUIPMENT       7.30%         $ 64,168,856



Largest Portfolio Holdings
December 31, 1998



SECURITY                           VALUE
- --------                        -----------
GTE                             $30,009,688
Philip Morris                    29,425,000
Ameritech                        27,885,000
General Electric                 27,036,356
DaimlerChrysler                  25,936,875
Bank of New York                 25,760,000
Xerox                            25,370,000
United Technologies              25,012,500
Merck                            22,891,562
Houston Industries               22,326,875



                                       7
<PAGE>

PORTFOLIO OF INVESTMENTS
December 31, 1998


                                       SHARES         VALUE
                                   ------------   ------------
COMMON STOCKS  94.5%
AEROSPACE/DEFENSE  0.5%
General Dynamics
   Diversified defense contractor      80,000      $ 4,690,000
                                                  ------------
AUTOMOTIVE AND
  RELATED  5.4%
DaimlerChrysler
   Manufacturer of automobiles,
   trucks, and related parts          270,000       25,936,875
Dana
   Manufacturer and distributor
   of products and systems
   for automotive and
   related industries                 275,000       11,240,625
Ford Motor
   Manufacturer and distributor
   of automobiles, trucks, and
   related parts                      175,000       10,270,312
                                                  ------------
                                                    47,447,812
                                                  ------------
BASIC MATERIALS  0.5%
Alcoa
   Manufacturer of containers          60,000        4,473,750
                                                  ------------
BUSINESS SERVICES
  AND SUPPLIES  4.0%
Electronic Data Systems
   Provider of management
   consulting and technology
   services                           200,000       10,050,000
Xerox
   Developer, manufacturer,
   and marketer of office
   automation products                215,000       25,370,000
                                                  ------------
                                                    35,420,000
                                                  ------------
CAPITAL GOODS  0.9%
Crown Cork & Seal
   Manufacturer of packaging
   products                           250,000        7,703,125
                                                  ------------
CHEMICALS  0.9%
duPont (E.I.) de Nemours
   Producer of chemicals              145,000        7,694,062
                                                  ------------
CONSUMER GOODS
  AND SERVICES  5.2%
Anheuser-Busch
   Brewery; theme park operator;
   manufacturer and recycler
   of aluminum beverage
   containers                         300,000       19,687,500


CONSUMER GOODS
  AND SERVICES (continued)
General Mills
   Manufacturer and marketer
   of consumer foods products         195,000     $ 15,161,250
PepsiCo
   Manufacturer and marketer
   of soft drinks and consumer
   products                           275,000       11,257,812
                                                  ------------
                                                    46,106,562
                                                  ------------
DRUGS AND
  HEALTH CARE  7.9%
Abbott Laboratories
   Developer and manufacturer
   of diversified health
   care products                      160,000        7,840,000
American Home Products
   Developer and manufacturer
   of pharmaceuticals, food,
   and housewares                     350,000       19,709,375
Baxter International
   Manufacturer and distributor
   of hospital and laboratory
   products                            90,000        5,788,125
Bristol-Myers Squibb
   Developer and manufacturer
   of health and personal
   care products                      100,000       13,381,250
Merck
   Developer and manufacturer
   of pharmaceuticals                 155,000       22,891,562
                                                  ------------
                                                    69,610,312
                                                  ------------
ELECTRIC AND GAS
  UTILITIES  7.0%
DQE
   Electric energy supplier           225,000        9,885,938
Houston Industries
   Worldwide energy provider          695,000       22,326,875
Sonat
   Energy company that
   operates in the exploration
   and production of oil and
   natural gas                        275,000        7,442,188
Unicom
   Electric utility                   280,000       10,797,500
The Williams Companies
   Transporter and producer
   of natural gas;
   telecommunications provider        350,000       10,915,625
                                                  ------------
                                                    61,368,126
                                                  ------------

- ----------
See footnotes on page 10.


                                       8
<PAGE>

PORTFOLIO OF INVESTMENTS
December 31, 1998


                                       SHARES         VALUE
                                   ------------   ------------
ELECTRONICS  2.8%
Harris
   Developer of electronic
   products and services              240,000    $   8,790,000
Raytheon (Class B)
   Producer of defense and
   commercial electronics             300,000       15,975,000
                                                  ------------
                                                    24,765,000
                                                  ------------
ENERGY  10.2%
BP Amoco (ADRs)
   (United Kingdom)
   Oil producer, refiner, and
   distributor                        175,000       15,684,375
Chevron
   Explorer, developer, and
   producer of crude oil
   and natural gas                    255,000       21,149,062
Exxon
   Explorer and producer
   of natural gas, oil, and
   petroleum products                 295,000       21,571,875
Mobil
   International oil enterprise       145,000       12,633,125
Royal Dutch Petroleum (Netherlands)
   Provider of international
   oil services                       280,000       13,405,000
Schlumberger
   Worldwide provider of
   energy services                    120,000        5,535,000
                                                  ------------
                                                    89,978,437
                                                  ------------
FINANCE AND
  INSURANCE  17.9%
American General
   Provider of insurance
   and annuity services               245,000       19,110,000
Bank of New York
   Commercial bank                    640,000       25,760,000
BankAmerica
   Commercial bank                    200,000       12,025,000
Chubb
   International holding company
   specializing in property and
   casualty insurance                 140,000        9,082,500
Citigroup
   Provider of investment
   services and insurance             290,000       14,355,000
Fannie Mae
   Provider of mortgage financing     215,000       15,910,000
Hartford Financial
   Services Group
   International insurance
   supplier                           250,000       13,718,750

Lincoln National
   Provider of life insurance and
   investment management
   services                           185,000       15,135,313
Mellon Bank
   Provider of financial
   services                           150,000       10,312,500
Morgan (J.P.)
   Provider of financial services      70,000        7,354,375
Washington Mutual
   Provider of financial services     394,800       15,076,425
                                                  ------------
                                                   157,839,863
                                                  ------------
FOOD  3.5%
ConAgra
   Producer and manufacturer
   of prepared foods and
   agricultural products              505,000       15,907,500
Sara Lee
   Manufacturer of processed
   foods and consumer products        540,000       15,221,250
                                                  ------------
                                                    31,128,750
                                                  ------------
MACHINERY AND
  INDUSTRIAL EQUIPMENT  7.3%
GATX
   Railcar leasing; equipment
   financing                          320,000       12,120,000
General Electric
   Supplier of industrial
   equipment and consumer
   products                           264,900       27,036,356
United Technologies
   Manufacturer of elevators,
   jet engines, flight systems,
   and automotive parts               230,000       25,012,500
                                                  ------------
                                                    64,168,856
                                                  ------------
PAPER AND PACKAGING  2.4%
Fort James
   Producer of paper and
   related products for consumer
   and industrial use                 325,000       13,000,000
Mead
   Manufacturer of paper,
   lumber, and wood products          270,000        7,914,375
                                                  ------------
                                                    20,914,375
                                                  ------------
PRINTING AND
  PUBLISHING  0.7%
Knight-Ridder Newspapers
   Newspapers; business
   information services               110,000        5,623,750
                                                  ------------

- ----------
See footnotes on page 10.


                                       9
<PAGE>

PORTFOLIO OF INVESTMENTS
December 31, 1998


                                       SHARES         VALUE
                                   ------------   ------------
RETAIL TRADE  1.5%
May Department Stores
   Department store operator          215,000     $ 12,980,625
                                                  ------------
TELECOMMUNICATIONS  9.8%
AT&T
   Provider of telecommunications
   services                           165,000       12,416,250
Ameritech
   Provider of telecommunications
   services                           440,000       27,885,000
GTE
   Provider of telephone services,
   systems, and equipment             445,000       30,009,688
SBC Communications
   Provider of telephone services     305,000       16,355,625
                                                  ------------
                                                    86,666,563
                                                  ------------
TOBACCO  3.3%
Philip Morris
   Manufacturer of tobacco
   products, food, and beverages      550,000       29,425,000
                                                  ------------
TRANSPORTATION  1.3%
Norfolk Southern
   Railroad holding company           375,000       11,882,813
                                                  ------------


                                    SHARES OR
                                    PRINCIPAL
                                      AMOUNT          VALUE
                                   ------------   ------------
MISCELLANEOUS/
  DIVERSIFIED  1.5%
AlliedSignal
   Producer of aerospace
   and automotive materials        290,000 shs.  $  12,850,625
                                                  ------------
TOTAL COMMON STOCKS
   (Cost $603,779,933)                             832,738,406
                                                  ------------
SHORT-TERM
  HOLDINGS  5.1%
Bank of Nova Scotia,
   Grand Cayman,
   Fixed Time Deposit,
   43/4%, 1/4/1999             $22,267,000          22,267,000
Republic National Bank of
  New York, Grand Cayman,
  Fixed Time Deposit,
   45/8%, 1/4/1999              22,268,000          22,268,000
                                                  ------------
TOTAL SHORT-TERM
  HOLDINGS
   (Cost $44,535,000)                               44,535,000
                                                  ------------
TOTAL INVESTMENTS  99.6%
   (Cost $648,314,933)                             877,273,406
OTHER ASSETS
  LESS LIABILITIES  0.4%                             3,583,555
                                                  ------------
NET ASSETS  100.0%                                $880,856,961
                                                  ============


- ----------
* Non-income producing security.
Descriptions of companies have not been audited by Deloitte & Touche LLP.
See Notes to Financial Statements.


                                       10
<PAGE>

STATEMENT OF ASSETS AND LIABILITIES
December 31, 1998

<TABLE>
<S>                                                                                         <C>                       <C>
ASSETS:
Investments, at value:
  Common stocks (cost $603,779,933) ...................................................     $832,738,406
  Short-term holdings (cost $44,535,000) ..............................................       44,535,000              $ 877,273,406
                                                                                            ------------
Cash ...................................................................................................                    555,660
Receivable for Capital Stock sold ......................................................................                  3,551,188
Receivable for interest and dividends ..................................................................                  1,594,596
Investment in, and expenses prepaid to, shareholder service agent ......................................                    176,011
Other ..................................................................................................                     54,333
                                                                                                                      -------------
Total Assets ...........................................................................................                883,205,194
                                                                                                                      -------------

LIABILITIES:
Payable for Capital Stock repurchased ..................................................................                    921,470
Accrued expenses, taxes, and other .....................................................................                  1,426,763
                                                                                                                      -------------
Total Liabilities ......................................................................................                  2,348,233
                                                                                                                      -------------
Net Assets .............................................................................................              $ 880,856,961
                                                                                                                      =============

COMPOSITION OF NET ASSETS:
Capital Stock, at par ($0.50 par value; 500,000,000 shares authorized;
  55,866,036 shares outstanding):
  Class A ..............................................................................................              $  24,094,902
  Class B ..............................................................................................                  1,116,138
  Class D ..............................................................................................                  2,721,978
Additional paid-in capital .............................................................................                613,458,282
Distributions in excess of net investment income .......................................................                   (177,833)
Undistributed net realized gain ........................................................................                 10,684,958
Net unrealized appreciation of investments .............................................................                228,958,536
                                                                                                                      -------------
Net Assets .............................................................................................              $ 880,856,961
                                                                                                                      =============

NET ASSET VALUE PER SHARE:
Class A ($760,175,810 / 48,189,804 shares) .............................................................                     $15.77
                                                                                                                             ======
Class B ($35,073,233 / 2,232,277 shares) ...............................................................                     $15.71
                                                                                                                             ======
Class D ($85,607,918 / 5,443,955 shares) ...............................................................                     $15.73
                                                                                                                             ======
</TABLE>

- ----------
See Notes to Financial Statements.


                                       11
<PAGE>

STATEMENT OF OPERATIONS
For the Year Ended December 31, 1998

<TABLE>
<S>                                                                                      <C>                <C>
INVESTMENT INCOME:
Dividends ............................................................................   $  21,888,191
Interest .............................................................................       2,549,508
                                                                                         -------------
Total Investment Income (net of foreign taxes withheld of $108,141) ...................................     $  24,437,699

EXPENSES:
Management fee .......................................................................       5,594,520
Distribution and service fees ........................................................       2,924,109
Shareholder account services .........................................................       1,241,294
Custody and related services .........................................................         175,589
Registration .........................................................................         137,555
Shareholder reports and communications ...............................................         136,745
Auditing and legal fees ..............................................................          88,474
Directors' fees and expenses .........................................................          21,901
Miscellaneous ........................................................................          33,102
                                                                                         -------------
Total Expenses ........................................................................................        10,353,289
                                                                                                            -------------
Net Investment Income .................................................................................        14,084,410

NET REALIZED AND UNREALIZED GAIN (LOSS) ON INVESTMENTS
  AND FOREIGN CURRENCY TRANSACTIONS:
Net realized gain on investments .....................................................     105,122,144
Net realized loss from foreign currency transactions .................................      (1,638,670)
Net change in unrealized appreciation of investments .................................      18,022,366
Net change in unrealized depreciation on translation of assets and
  liabilities denominated in foreign currencies ......................................       1,231,505
                                                                                         -------------
Net Gain on Investments and Foreign Currency Transactions .............................................       122,737,345
                                                                                                            -------------
Increase in Net Assets from Operations ................................................................     $ 136,821,755
                                                                                                            =============
</TABLE>

- ----------
See Notes to Financial Statements.


                                       12
<PAGE>

STATEMENTS OF CHANGES IN NET ASSETS

<TABLE>
<CAPTION>
                                                                                              YEAR ENDED DECEMBER 31,
                                                                                           ------------------------------
                                                                                                1998             1997
                                                                                           -------------    -------------
<S>                                                                                        <C>              <C>
OPERATIONS:
Net investment income .................................................................    $  14,084,410    $  13,966,222
Net realized gain on investments ......................................................      105,122,144      135,910,283
Net realized loss from foreign currency transactions ..................................       (1,638,670)      (1,513,242)
Net change in unrealized appreciation of investments ..................................       18,022,366       19,276,740
Net change in unrealized appreciation/depreciation on translation of
   assets and liabilities denominated in foreign currencies ...........................        1,231,505       (2,113,562)
                                                                                           -------------    -------------
Increase in Net Assets from Operations ................................................      136,821,755      165,526,441
                                                                                           -------------    -------------
DISTRIBUTIONS TO SHAREHOLDERS:
Net investment income:
   Class A ............................................................................      (13,006,242)     (13,924,923)
   Class B ............................................................................         (301,403)        (164,161)
   Class D ............................................................................         (851,270)        (893,492)
Net realized gain on investments:
   Class A ............................................................................     (111,760,141)     (87,928,428)
   Class B ............................................................................       (4,472,471)      (1,905,117)
   Class D ............................................................................      (12,434,658)      (8,996,490)
                                                                                           -------------    -------------
Decrease in Net Assets from Distributions .............................................     (142,826,185)    (113,812,611)
                                                                                           -------------    -------------


<CAPTION>
                                                                     SHARES
                                                         ------------------------------
                                                             YEAR ENDED DECEMBER 31,
                                                         ------------------------------
                                                              1998              1997
                                                         -------------    -------------
<S>                                                        <C>              <C>             <C>              <C>
CAPITAL SHARE TRANSACTIONS:
Net proceeds from sale of shares:
   Class A ............................................      1,075,908        1,308,404       17,690,194       21,242,046
   Class B ............................................        664,577          626,437       10,829,016       10,275,506
   Class D ............................................        542,815          653,126        8,937,844       10,523,717
Investment of dividends:
   Class A ............................................        467,206          473,066        7,430,217        7,757,656
   Class B ............................................         17,828            9,277          279,506          152,545
   Class D ............................................         49,412           50,194          779,902          821,894
Exchanged from associated Funds:
   Class A ............................................      8,129,002        5,617,352      129,536,299       89,701,736
   Class B ............................................        486,767          213,033        7,903,883        3,448,926
   Class D ............................................      3,098,173        2,927,353       49,213,928       48,648,056
Shares issued in payment of gain
 distributions:
   Class A ............................................      5,077,418        3,903,524       79,072,919       61,643,305
   Class B ............................................        271,666          114,620        4,204,415        1,797,496
   Class D ............................................        741,851          534,270       11,512,215        8,416,701
                                                         -------------    -------------    -------------    -------------
Total .................................................     20,622,623       16,430,656      327,390,338      264,429,584
                                                         -------------    -------------    -------------    -------------
Cost of shares repurchased:
   Class A ............................................     (4,342,402)      (3,842,001)     (70,858,055)     (62,421,380)
   Class B ............................................       (212,770)         (62,983)      (3,418,774)      (1,046,510)
   Class D ............................................       (971,678)        (800,763)     (15,746,103)     (12,923,435)
Exchanged into associated Funds:
   Class A ............................................     (8,352,447)      (5,397,178)    (132,655,143)     (86,520,445)
   Class B ............................................       (227,709)        (102,320)      (3,672,827)      (1,680,196)
   Class D ............................................     (3,108,165)      (2,573,135)     (49,277,507)     (43,101,112)
                                                         -------------    -------------    -------------    -------------
Total .................................................    (17,215,171)     (12,778,380)    (275,628,409)    (207,693,078)
                                                         -------------    -------------    -------------    -------------
Increase in Net Assets from Capital
   Share Transactions .................................      3,407,452        3,652,276       51,761,929       56,736,506
                                                         =============    =============    -------------    -------------

Increase in Net Assets ................................................................       45,757,499      108,450,336

NET ASSETS:
Beginning of year .....................................................................      835,099,462      726,649,126
                                                                                           -------------    -------------

End of Year (including distributions in excess of net investment income and
   undistributed net investment income of $(177,833) and $20,589, respectively) .......    $ 880,856,961    $ 835,099,462
                                                                                           =============    =============
</TABLE>

- ----------
See Notes to Financial Statements.



                                       13
<PAGE>

NOTES TO FINANCIAL STATEMENTS


1. Multiple Classes of Shares -- Seligman Common Stock Fund, Inc. (the "Fund")
offers three classes of shares. Class A shares are sold with an initial sales
charge of up to 4.75% and a continuing service fee of up to 0.25% on an annual
basis. Class A shares purchased in an amount of $1,000,000 or more are sold
without an initial sales charge but are subject to a contingent deferred sales
charge ("CDSC") of 1% on redemptions within 18 months of purchase. Class B
shares are sold without an initial sales charge but are subject to a
distribution fee of 0.75%, a service fee of up to 0.25% on an annual basis, and
a CDSC, if applicable, of 5% on redemptions in the first year of purchase,
declining to 1% in the sixth year and 0% thereafter. Class B shares will
automatically convert to Class A shares on the last day of the month that
precedes the eighth anniversary of their date of purchase. Class D shares are
sold without an initial sales charge but are subject to a distribution fee of up
to 0.75% and a service fee of up to 0.25% on an annual basis, and a CDSC, if
applicable, of 1% imposed on redemptions made within one year of purchase. The
three classes of shares represent interests in the same portfolio of
investments, have the same rights and are generally identical in all respects
except that each class bears its separate distribution and certain other class
expenses, and has exclusive voting rights with respect to any matter on which a
separate vote of any class is required.

2. Significant Accounting Policies -- The financial statements have been
prepared in conformity with generally accepted accounting principles which
require management to make certain estimates and assumptions at the date of the
financial statements. The following summarizes the significant accounting
policies of the Fund:

a.   Security Valuation -- Investments in common stocks and convertible issues
     are valued at current market values or, in their absence, at fair values
     determined in accordance with procedures approved by the Board of
     Directors. Securities traded on an exchange are valued at last sales prices
     or, in their absence and in the case of over-the-counter securities, at the
     mean of bid and asked prices. Short-term holdings maturing in 60 days or
     less are valued at amortized cost.

b.   Foreign Currency Transactions -- The books and records of the Fund are
     maintained in USdollars. The market value of investment securities, other
     assets and liabilities denominated in foreign currencies are translated
     into US dollars at the daily rate of exchange as reported by a pricing
     service. Purchases and sales of investment securities, income, and expenses
     are translated into USdollars at the rate of exchange prevailing on the
     respective dates of such transactions.

          The Fund separates that portion of the results of operations resulting
     from changes in the foreign exchange rates from the fluctuations arising
     from changes in the market prices of securities held in the portfolio.
     Similarly, the Fund separates the effect of changes in foreign exchange
     rates from the fluctuations arising from changes in the market prices of
     portfolio securities sold during the period.

c.   Federal Taxes -- There is no provision for federal income tax. The Fund has
     elected to be taxed as a regulated investment company and intends to
     distribute substantially all taxable net income and net gain realized.

d.   Security Transactions and Related Investment Income -- Investment
     transactions are recorded on trade dates. Identified cost of investments
     sold is used for both financial statement and federal income tax purposes.
     Dividends receivable and payable are recorded on ex-dividend dates, except
     that certain dividends from foreign securities where the ex-dividend dates
     may have passed are recorded as soon as the Fund is informed of the
     dividend. Interest income is recorded on an accrual basis.

e.   Multiple Class Allocations -- All income, expenses (other than
     class-specific expenses), and realized and unrealized gains or losses are
     allocated daily to each class of shares based upon the relative value of
     shares of each class. Class-specific expenses, which include distribution
     and service fees and any other items that are specifically attributable to
     a particular class, are charged directly to such class. For the year ended
     December 31, 1998, distribution and service fees were the only
     class-specific expenses.

f.   Distributions to Shareholders -- The treatment for financial statement
     purposes of distributions made to shareholders during the year from net
     investment income or net realized gains may differ from their ultimate
     treatment for federal income tax purposes. These differences are caused
     primarily by differences in the timing of the recognition of certain
     components of income, expense, or realized capital gain for federal income
     tax purposes. Where such differences are permanent in nature, they are
     reclassified in the components of net assets based on their ultimate
     characterization for federal income tax purposes. Any such reclassification


                                       14
<PAGE>

NOTES TO FINANCIAL STATEMENTS

     will have no effect on net assets, results of operations, or net asset
     value per share of the Fund.

     For the year ended December 31, 1998, the Fund redeemed 17,215,171 of its
     shares from shareholders aggregating $275,628,409, of which approximately
     $24,400,000 represents capital gain distributions. This information is
     provided for federal income tax purposes only.

3. Purchases and Sales of Securities -- Purchases and sales of portfolio
securities, excluding US Government obligations and short-term investments, for
the year ended December 31, 1998, amounted to $755,551,791 and $783,919,408,
respectively.

     At December 31, 1998, the cost of investments for federal income tax
purposes was substantially the same as the cost for financial reporting
purposes, and the tax basis gross unrealized appreciation and depreciation of
portfolio securities amounted to $232,238,319 and $3,279,846, respectively.

4. Management Fee, Distribution Services, and Other Transactions -- J. & W.
Seligman & Co. Incorporated (the "Manager") manages the affairs of the Fund and
provides the necessary personnel and facilities. Compensation of all officers of
the Fund, all directors of the Fund who are employees or consultants of the
Manager, and all personnel of the Fund and the Manager is paid by the Manager.
The Manager receives a fee, calculated daily and payable monthly, equal to 0.65%
per annum of the first $1 billion of the Fund's average daily net assets, 0.60%
per annum of the next $1 billion of the Fund's average daily net assets, and
0.55% per annum of the Fund's average daily net assets in excess of $2 billion.
The management fee reflected in the Statement of Operations represents 0.65% per
annum of the Fund's average daily net assets.

     Prior to March 31, 1998, Seligman Henderson Co., an entity owned 50% each
by the Manager and Henderson International, Inc., a subsidiary of Henderson plc,
supervised and directed all or a portion of the Fund's foreign investments. For
this service, the Manager paid Seligman Henderson Co. a monthly fee.

     Seligman Advisors, Inc. (the "Distributor") (formerly Seligman Financial
Services, Inc.), agent for the distribution of the Fund's shares and an
affiliate of the Manager, received concessions of $58,596 from sales of Class A
shares, after commissions of $449,760 were paid to dealers.

     The Fund has an Administration, Shareholder Services and Distribution Plan
(the "Plan") with respect to distribution of its shares. Under the Plan, with
respect to Class A shares, service organizations can enter into agreements with
the Distributor and receive a continuing fee of up to 0.25% on an annual basis,
payable quarterly, of the average daily net assets of the Class A shares
attributable to the particular service organizations for providing personal
services and/or the maintenance of shareholder accounts. The Distributor charges
such fees to the Fund pursuant to the Plan. For the year ended December 31,
1998, fees incurred under the Plan aggregated $1,818,756 or 0.24% per annum of
the average daily net assets of Class A shares.

     Under the Plan, with respect to Class B and Class D shares, service
organizations can enter into agreements with the Distributor and receive a
continuing fee for providing personal services and/or the maintenance of
shareholder accounts of up to 0.25% on an annual basis of the average daily net
assets of the Class B and Class D shares for which the organizations are
responsible; and, for Class D shares only, fees for providing other distribution
assistance of up to 0.75% on an annual basis of such average daily net assets.
Such fees are paid monthly by the Fund to the Distributor pursuant to the Plan.

     With respect to Class B shares, a distribution fee of 0.75% on an annual
basis of average daily net assets is payable monthly by the Fund to the
Distributor; however, the Distributor has sold its rights to this fee to a third
party (the "Purchaser"), which provides funding to the Distributor to enable it
to pay commissions to dealers at the time of the sale of the related Class B
shares.

     For the year ended December 31, 1998, fees incurred under the Plan,
equivalent to 1% per annum of the average daily net assets of Class B and Class
D shares, amounted to $276,947 and $828,406, respectively.

     The Distributor is entitled to retain any CDSC imposed on redemptions of
Class D shares occurring within one year of purchase and on certain redemptions
of Class A shares occurring within 18 months of purchase. For the year ended
December 31, 1998, such charges amounted to $17,980.

     The Distributor has sold its rights to collect any CDSC imposed on
redemptions of Class B shares to the Purchaser. In connection with the sale of
its rights to collect any CDSC and the distribution fees with respect to Class B
shares described above, the Distributor receives payments


                                       15
<PAGE>

NOTES TO FINANCIAL STATEMENTS


from the Purchaser based on the value of Class Bshares sold. The aggregate
amount of such payments retained by the Distributor, for the year ended December
31, 1998, amounted to $16,073.

     Seligman Services, Inc., an affiliate of the Manager, is eligible to
receive commissions from certain sales of shares of the Fund, as well as
distribution and service fees pursuant to the Plan. For the year ended December
31, 1998, Seligman Services, Inc. received commissions of $25,939 from the sale
of shares of the Fund. Seligman Services, Inc. also received distribution and
service fees of $459,344, pursuant to the Plan.

     Seligman Data Corp., which is owned by the Fund and certain associated
investment companies, charged the Fund at cost $1,240,581 for shareholder
account services. The Fund's investment in Seligman Data Corp. is recorded at a
cost of $22,506.

   Certain officers and directors of the Fund are officers or directors of the
Manager, the Distributor, Seligman Services, Inc., and/or Seligman Data Corp.

     The Fund has a compensation arrangement under which directors who receive
fees may elect to defer receiving such fees. Directors may elect to have the
deferred fees accrue interest or earn a return based on the performance of the
Fund or other funds in the Seligman Group of Investment Companies. The cost of
such fees and earnings accrued thereon is included in directors' fees and
expenses, and the accumulated balance thereof at December 31, 1998, of $177,833
is included in other liabilities. Deferred fees and related accrued earnings are
not deductible for federal income tax purposes until such amounts are paid.

5. Committed Line of Credit -- Effective July 1, 1998, the Fund entered into a
joint $800 million committed line of credit that is shared by substantially all
funds in the Seligman Group of Investment Companies. The Fund's borrowings are
limited to 10% of its net assets. Borrowings pursuant to the credit facility are
subject to interest at a rate equal to the overnight federal funds rate plus
0.50%. The Fund incurs a commitment fee of 0.08% per annum on its share of the
unused portion of the credit facility. The credit facility may be drawn upon
only for temporary purposes and is subject to certain other customary
restrictions. The credit facility commitment expires one year from the date of
the agreement but is renewable with the consent of the participating banks. To
date, the Fund has not borrowed from the credit facility.



                                       16
<PAGE>

FINANCIAL HIGHLIGHTS


     The tables below are intended to help you understand each Class's financial
performance for the past five years or from its inception, if less than five
years. Certain information reflects financial results for a single share of a
Class that was held throughout the periods shown. Per share amounts are
calculated using average shares outstanding. "Total return" shows the rate that
you would have earned (or lost) on an investment in each Class, assuming you
reinvested all your dividends and capital gain distributions. Total returns do
not reflect any sales charges and are not annualized for periods of less than
one year.

<TABLE>
<CAPTION>
                                                                                            CLASS A
                                                                 -------------------------------------------------------------
                                                                                    YEAR ENDED DECEMBER 31,
                                                                 -------------------------------------------------------------
                                                                    1998         1997         1996         1995         1994
                                                                 ---------    ---------    ---------    ---------    ---------
<S>                                                               <C>          <C>          <C>          <C>          <C>
PER SHARE DATA:
Net Asset Value, Beginning of Year ...........................      $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 realized and unrealized gain (loss)
  on investments .............................................        2.32         3.18         1.81         3.00        (0.64)
Net realized and unrealized gain (loss)
  from foreign currency transactions .........................          --        (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 net realized 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 Year .................................      $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 year (000s omitted) .......................    $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>

- ----------
See footnotes on page 18.


                                       17
<PAGE>

FINANCIAL HIGHLIGHTS

<TABLE>
<CAPTION>
                                                                                CLASS B
                                                                 -----------------------------------
                                                                        YEAR ENDED
                                                                       DECEMBER 31,          4/22/96*
                                                                 ----------------------         TO
                                                                    1998         1997       12/31/96
                                                                 ---------    ---------    ---------
<S>                                                                <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 realized and unrealized gain
  on investments ............................................         2.31         3.17         1.20
Net realized and unrealized gain (loss)
  from foreign currency transactions ........................           --        (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 net realized 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 (000s omitted) ....................      $35,073      $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%++
</TABLE>


<TABLE>
<CAPTION>
                                                                                            CLASS D
                                                                 -------------------------------------------------------------
                                                                                    YEAR ENDED DECEMBER 31,
                                                                 -------------------------------------------------------------
                                                                     1998         1997         1996         1995         1994
                                                                 ---------    ---------    ---------    ---------    ---------
<S>                                                                <C>          <C>          <C>          <C>          <C>
PER SHARE DATA:
Net Asset Value, Beginning of Year ..........................       $15.89       $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 realized and unrealized gain (loss)
  on investments ............................................         2.32         3.18         1.80         3.00        (0.66)
Net realized and unrealized gain (loss)
  from foreign currency transactions ........................           --        (0.07)          --         0.01           --
                                                                 ---------    ---------    ---------    ---------    ---------
Total from Investment Operations ............................         2.48         3.28         2.04         3.25        (0.44)
                                                                 ---------    ---------    ---------    ---------    ---------
Less Distributions:
Dividends from net investment income ........................        (0.17)       (0.20)       (0.21)       (0.22)       (0.23)
Distributions from net realized 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 Year ................................       $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 year (000s omitted) ......................      $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>

- ----------
 * Commencement of offering of shares.
 + Annualized.
++ For the year ended December 31, 1996.
See Notes to Financial Statements.



                                       18
<PAGE>

REPORT OF INDEPENDENT AUDITORS

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

The Board of Directors and Shareholders,
Seligman Common Stock Fund, Inc.:


We have audited the accompanying statement of assets and liabilities, including
the portfolio of investments, of Seligman Common Stock Fund, Inc. as of December
31, 1998, the related statements of operations for the year then ended and of
changes in net assets for each of the years in the two-year period then ended,
and the financial highlights for each of the periods presented. These financial
statements and financial highlights are the responsibility of the Fund's
management. Our responsibility is to express an opinion on these financial
statements and financial highlights based on our audits.

We conducted our audits in accordance with generally accepted auditing
standards. Those standards require that we plan and perform the audit to obtain
reasonable assurance about whether the financial statements and financial
highlights are free of material misstatement. An audit includes examining, on a
test basis, evidence supporting the amounts and disclosures in the financial
statements. Our procedures included confirmation of securities owned as of
December 31, 1998, by correspondence with the Fund's custodian. An audit also
includes assessing the accounting principles used and significant estimates made
by management, as well as evaluating the overall financial statement
presentation. We believe that our audits provide a reasonable basis for our
opinion.

In our opinion, such financial statements and financial highlights present
fairly, in all material respects, the financial position of Seligman Common
Stock Fund, Inc. as of December 31, 1998, the results of its operations, the
changes in its net assets, and the financial highlights for the respective
stated periods, in conformity with generally accepted accounting principles.


DELOITTE & TOUCHE LLP
New York, New York
January 29, 1999

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


                                       19
<PAGE>

FEDERAL TAX STATUS OF 1998 DIVIDEND AND
GAIN DISTRIBUTIONS FOR TAXABLE ACCOUNTS

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

The quarterly dividends paid to Class A, B, and D shareholders in 1998 are
taxable as ordinary income for federal tax purposes, regardless of whether they
were received in cash or in shares. Under the Internal Revenue Code, 77.34% of
the dividends paid to Class A, B, and D shareholders has been designated as
qualifying for the dividends received deduction available to corporate
shareholders. In order to claim the dividends received deduction for these
distributions, corporate shareholders must have held the Fund's shares for at
least 46 days or more during the 90-day period beginning 45 days before each
ex-dividend date.

A distribution of $1.180 per share, from net long-term gain realized on
investments during the period November 1, 1997, to December 31, 1997, was paid
on June 24, 1998, to Class A, B, and D shareholders. On November 23, 1998, a
distribution of $1.288 per share from net long-term gain realized on investments
in 1998, was paid to Class A, B and D shareholders. In 1997, Congress revised
the capital gains provisions, so that depending on how long a security was owned
when it was sold, investors may have been faced with a 28% capital gains rate, a
20% rate, or both. In October 1998, Congress simplified the capital gains
provisions so that, generally, all gains on securities held more than one year
are to be taxed at a maximum 20% rate. The distributions from net long-term gain
are designated as "capital gain dividends" for federal income tax purposes and
are taxable to shareholders in 1998 as a long-term gain from the sale of capital
assets, no matter how long your shares have been owned or whether the
distribution was paid in additional shares or cash. However, if shares on which
a long-term capital gain distribution was received are subsequently sold, and
such shares were held for six months or less, any loss on the sale would be
treated as long-term to the extent it offsets the long-term capital gain
distribution.

If the gain distributions were paid in shares, the per share cost basis for
federal income tax purposes is $16.02 for Class A shares and $15.98 for Class B
and D shares for the June 24 distribution, and $15.19 for Class A shares, $15.12
for Class B shares, and $15.13 for Class D shares for the November 23
distribution.

A 1998 year-end statement of account activity and a 1998 tax package, which may
include a Form 1099-DIV, a Form 1099-B, and/or a Cost Basis Statement, have been
mailed to each shareholder. Form 1099-DIVshows the distributions paid to the
shareholder during the year. Form 1099-B shows the proceeds of any redemptions
paid to the shareholder during the year. Cost Basis Statements report all sales
or exchanges from a shareholder's account which may have resulted in a capital
gain or loss in 1998. The information shown on Forms 1099-DIV and 1099-Bis
reported to the Internal Revenue Service as required by federal regulations.

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

                                       20
<PAGE>

BOARD OF DIRECTORS

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

John R. Galvin 2, 4
Dean, Fletcher School of Law and Diplomacy
   at Tufts University
Director, Raytheon Company

Alice S. Ilchman 3, 4
Trustee, Committee for Economic Development
Chairman, The Rockefeller Foundation

Frank A. McPherson 2, 4
Director, Kimberly-Clark Corporation
Director, Baptist Medical Center

John E. Merow 2, 4
Retired Chairman and Senior Partner,
   Sullivan & Cromwell, Law Firm
Director, Commonwealth Industries, Inc.
Director, New York Presbyterian Hospital

Betsy S. Michel 2, 4
Trustee, The Geraldine R. Dodge Foundation
Chairman of the Board of Trustees, St. George's School

William C. Morris 1
Chairman
Chairman of the Board,
   J. & W. Seligman & Co. Incorporated
Chairman, Carbo Ceramics Inc.
Director, Kerr-McGee Corporation

James C. Pitney 3, 4
Retired Partner, Pitney, Hardin, Kipp & Szuch, Law Firm

James Q. Riordan 3, 4
Director, KeySpan Energy Corporation
Trustee, Committee for Economic Development
Director, Public Broadcasting Service

Richard R. Schmaltz 1
Managing Director, Director of Investments,
   J. & W. Seligman & Co. Incorporated
Trustee Emeritus, Colby College

Robert L. Shafer 3, 4
Retired Vice President, Pfizer Inc.

James N. Whitson 2, 4
Director and Consultant, Sammons Enterprises, Inc.
Director, C-SPAN
Director, CommScope, Inc.

Brian T. Zino 1
President
President, J. & W. Seligman & Co. Incorporated
Chairman, Seligman Data Corp.
Director, ICI Mutual Insurance Company

Director Emeritus
Fred E. Brown
Director and Consultant,
   J. & W. Seligman &Co. Incorporated

- ----------
Member:    1 Executive Committee
           2 Audit Committee
           3 Director Nominating Committee
           4 Board Operations Committee

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

                                       21
<PAGE>

EXECUTIVE OFFICERS

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

William C. Morris
Chairman

Brian T. Zino
President

Charles C. Smith, Jr.
Vice President

Lawrence P. Vogel
Vice President

Thomas G. Rose
Treasurer

Frank J. Nasta
Secretary

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



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

FOR MORE INFORMATION


Manager

J. & W. Seligman & Co. Incorporated
100 Park Avenue
New York, NY  10017


General Counsel

Sullivan & Cromwell


Independent Auditors

Deloitte & Touche LLP


General Distributor

Seligman Advisors, Inc.
100 Park Avenue
New York, NY  10017


Shareholder Service Agent

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


Important Telephone Numbers

(800) 221-2450    Shareholder Services
(800) 445-1777    Retirement Plan Services
(212) 682-7600    Outside the United States
(800) 622-4597    24-Hour Automated Telephone Access Service

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


                                       22
<PAGE>

GLOSSARY OF FINANCIAL TERMS


Capital Gain Distribution -- A payment to mutual fund shareholders of profits
realized on the sale of securities in a fund's portfolio.

Capital Appreciation/Depreciation -- An increase or decrease in the market value
of a mutual fund's portfolio securities, which is reflected in the net asset
value of the fund's shares. Capital appreciation/depreciation of an individual
security is in relation to the original purchase price.

Compounding -- The change in the value of an investment as shareholders receive
earnings on their investment's earnings. For example, if $1,000 is invested at a
fixed rate of 7% a year, the initial investment is worth $1,070 after one year.
If the return is compounded, second year earnings will not be based on the
original $1,000, but on the $1,070, which includes the first year's earnings.

Contingent Deferred Sales Charge (CDSC) -- Depending on the class of shares
owned, a fee charged by a mutual fund when shares are sold back to the fund (the
CDSC expires after a fixed time period).

Dividend -- A payment by a mutual fund, usually derived from the fund's net
investment income (dividends and interest less expenses).

Dividend Yield -- A measurement of a fund's dividend as a percentage of the
maximum offering price.

Expense Ratio -- The cost of doing business for a mutual fund, expressed as a
percent of the fund's net assets.

Investment Objective -- The shared investment goal of a fund and its
shareholders.

Management Fee -- The amount paid by a mutual fund to its investment advisor(s).

Multiple Classes of Shares -- Although an individual mutual fund invests in only
one portfolio of securities, it may offer investors several purchase options
which are "classes" of shares. Multiple classes permit shareholders to choose
the fee structure that best meets their needs and goals. Generally, each class
will differ in terms of how and when sales charges and certain fees are
assessed.

National Association of Securities Dealers, Inc. (NASD) -- A self-regulatory
body with authority over firms that distribute mutual funds.

Net Asset Value (NAV) Per Share -- The market worth of one fund share, obtained
by adding a mutual fund's total assets (securities, cash, and any accrued
earnings), subtracting liabilities, and dividing the resulting net assets by the
number of shares outstanding.

Offering Price (OP) -- The price at which a mutual fund's share can be
purchased. The offering price per share is the current net asset value plus any
sales charge.

Portfolio Turnover -- A measure of the trading activity in a mutual fund's
investment portfolio that reflects how often securities are bought and sold.

Prospectus -- The legal document describing a mutual fund to all prospective
shareholders. It contains information required by the Securities and Exchange
Commission (SEC), such as a fund's investment objective and policies, services,
investment restrictions, how shares are bought and sold, fund fees and other
charges, and the fund's financial highlights.

SEC Yield -- SEC Yield refers to the net income earned by a fund during a recent
30-day period. This income is annualized and then divided by the maximum
offering price per share on the last day of the 30-day period. The SEC Yield
formula reflects semiannual compounding.

Securities and Exchange Commission -- The primary US federal agency that
regulates the registration and distribution of mutual fund shares.

Statement of Additional Information -- A document that contains updated or more
detailed information about an investment company and that supplements the
prospectus. It is available at no charge upon request.

Total Return -- A measure of a fund's performance encompassing all elements of
return. Reflects the change in share price over a given period and assumes all
distributions are taken in additional fund shares. The Average Annual Total
Return represents the average annual compounded rate of return for the periods
presented.

Yield on Securities -- For bonds, the current yield is the coupon rate of
interest, divided by the purchase price. For stocks, the yield is measured by
dividing dividends paid by the market price of the stock.


- ----------
Adapted from the Investment Company Institute's 1998 Mutual Fund Fact Book.


                                       23
<PAGE>

   This report is intended only for the information of shareholders or those
   who have received the offering prospectus covering shares of Capital Stock
    of Seligman Common Stock Fund, Inc., which contains information about the
   sales charges, management fee, and other costs. Please read the prospectus
                  carefully before investing or sending money.



                            SELIGMAN ADVISORS, INC.
                                an affiliate of

                                     [LOGO]

                             J. & W. SELIGMAN & CO.
                                  INCORPORATED
                                ESTABLISHED 1864
                      100 Park Avenue, New York, NY 10017


EQCS2  12/98                                     [LOGO]Printed on Recycled Paper
<PAGE>

                                                                File No. 2-10835
                                                                         811-234




PART C.  OTHER INFORMATION
- -------  -----------------

Item 23.  Exhibits.
- -------   ---------

      All Exhibits have been previously filed; except Exhibits marked with an
asterisk (*) which are filed herewith.

(a)     *Articles Supplementary dated May 24, 1999.

(a)(1)  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)     *Addendum to Sales/Bank Agreement. (Incorporated by reference to Post-
        Effective Amendment No. 57 to the Registration Statement of Seligman
        Capital Fund, Inc. (File #811-1886) filed on May 28, 1999.)

(e)(1)  *Form of Bank Agreement between Seligman Advisors, Inc. and Banks.
        (Incorporated by reference to Post-Effective Amendment No. 57 to the
        Registration Statement of Seligman Capital Fund, Inc. (File #811-1886)
        filed on May 28, 1999.)

(e)(2)  Form of Amended Distributing Agreement between Registrant and Seligman
        Advisors, Inc. (Incorporated by reference to Registrant's Post-Effective
        Amendment No. 75 filed on April 29, 1997.)

(e)(3)  Form of Amended Sales Agreement between Seligman Advisors, Inc. and
        Dealers. (Incorporated by reference to Post-Effective Amendment No. 74
        filed on April 19, 1996.)

(e)(4)  Form of Sales Agreement between Seligman Advisors, Inc. and Morgan
        Stanley Dean Witter & Co. (formerly, 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)(5)  Form of Sales Agreement between Seligman Advisors, Inc. and Morgan
        Stanley Dean Witter & Co. (formerly, 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)(6)  Form of Dealer Agreement between Seligman Advisors, Inc. and Salomon
        Smith Barney Inc. (formerly, 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.)

                                      C-1
<PAGE>

                                                                File No. 2-10835
                                                                         811-234




PART C.  OTHER INFORMATION (continued)
- -------  ------------------

(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 in respect of Class C shares.

(i)(1)  Opinion and Consent of Counsel. (Incorporated by reference to
        Registrant's Post-Effective Amendment No. 75 filed on April 29, 1997.)

(j)     *Consent of Independent Auditors.

(k)     Not applicable.

(l)     *Form of Purchase Agreement (Investment Letter) for Initial Capital for
        Class C shares between Registrant and J. & W. Seligman & Co.
        Incorporated.

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

(l)(2)  Purchase Agreement (Investment Letter) for Initial Capital for Class D
        Shares between Registrant and J. & W. Seligman & Co. Incorporated.
        (Incorporated by reference to Registrant's Post-Effective Amendment No.
        75 filed on April 29, 1997.)

(m)     *Amended Administration, Shareholder Services and Distribution Plan.
        (Incorporated by reference to Post-Effective Amendment No. 57 to the
        Registration Statement to the Seligman Capital Fund, Inc. (File #811-
        1886) filed on May 28, 1999.)

(m)(1)  *Amended Administration, Shareholder Services and Distribution Agreement
        between Seligman Advisors, Inc. and Dealers. (Incorporated by reference
        to Post-Effective Amendment No. 57 to the Registration Statement to the
        Seligman Capital Fund, Inc. (File #811-1886) filed on May 28, 1999.)

(n)     Financial Data Schedules. (Incorporated by reference to Registrant's
        Post-Effective Amendment No 78 filed on April 30, 1999.)

(o)     *Plan of Multiple Classes of Shares (four Classes) pursuant to Rule 18f-
        3 under the Investment Company Act of 1940. (Incorporated by reference
        to Post-Effective Amendment No. 57 to the Registration Statement to the
        Seligman Capital Fund, Inc. (File #811-1886) filed on May 28, 1999.)

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.)

                                      C-2
<PAGE>

                                                                File No. 2-10835
                                                                         811-234



PART C.  OTHER INFORMATION (continued)
- -------  ------------------

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.

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 eighteen 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.

                                      C-3
<PAGE>

                                                                File No. 2-10835
                                                                         811-234


PART C.  OTHER INFORMATION (continued)
- -------  -----------------

    (b)  Name of each director, officer or partner of Registrant's principal
         underwriter named in response to Item 20:


<TABLE>
<CAPTION>
                            Seligman Advisors, Inc.
                            -----------------------
                              As of April 30, 1999
                              --------------------

            (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, Division        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
     Matthew A. Digan*                    Senior Vice President,                 None
                                          Domestic Funds
     Jonathan G. Evans                    Senior Vice President, Sales           None
     222 Fairmont Way
     Ft. Lauderdale, FL  33326
     Robert T. Hausler*                   Senior Vice President, International   None
                                          Funds
     T. Wayne Knowles                     Senior Vice President,                 None
     104 Morninghills Court               Division 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
     Michelle L. McCann-Rappa*            Senior Vice President,                 None
                                          Retirement Plans
     Scott H. Novak*                      Senior Vice President, Insurance       None
     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
</TABLE>

                                      C-4
<PAGE>

                                                                File No. 2-10835
                                                                         811-234


PART C.  OTHER INFORMATION (continued)
- -------  -----------------

<TABLE>
<CAPTION>
                            Seligman Advisors, Inc.
                            -----------------------
                              As of April 30, 1999
                              --------------------


            (1)                                (2)                                     (3)
     Name and Principal                 Positions and Offices                  Positions and Offices
     Business Address                   with Underwriter                       with Registrant
     ----------------                   ----------------                       ---------------
<S>                                     <C>                                     <C>
     Bruce M. Tuckey                    Senior Vice President, Sales           None
     41644 Chathman Drive
     Novi, MI  48375
     Andrew S. Veasey                   Senior Vice President, Sales           None
     14 Woodside Drive
     Rumson, NJ  07760
     Charles L. von Breitenbach, II*    Senior Vice President,                 None
                                        Managed Money
     J. Brereton Young*                 Senior Vice President, Director        None
                                        of Sales Development
     Jeffrey S. Dean*                   Vice President, Business Analysis      None
     Mason S. Flinn                     Vice President, Regional Retirement    None
     159 Varennes                       Plans Manager
     San Francisco, CA  94133
     Marsha E. Jacoby*                  Vice President, Offshore Business      None
                                        Manager
     William W. Johnson*                Vice President, Order Desk             None
     Joan M. O'Connell                  Vice President, Regional Retirement    None
     3707 Fifth Avenue #136             Plans Manager
     San Diego, CA  92103
     Ronald W. Pond*                    Vice President, Portfolio Advisor      None
     Jeffery C. Pleet*                  Vice President, Regional Retirement    None
                                        Plans Manager
     Tracy A. Salomon*                  Vice President, Retirement Marketing   None
     Helen Simon*                       Vice President, Sales Administration   None
     Gary A. Terpening*                 Vice President, Director of Business   None
                                        Development
     Charles E. Wenzel                  Vice President, Regional Retirement    None
     703 Greenwood Road                 Plans Manager
     Wilmington, DE  19807
     Jeff Botwinick                     Regional Vice President                None
     11508 Foster Road
     Overland Park, KS  66210
     Kevin Casey                        Regional Vice President                None
     19 Bayview Avenue
     Babylon, NY  11702
     Richard B. Callaghan               Regional Vice President                None
     7821 Dakota Lane
     Orland Park, IL  60462

</TABLE>

                                      C-5
<PAGE>

                                                                File No. 2-10835
                                                                         811-234


PART C.  OTHER INFORMATION (continued)
- -------  -----------------

<TABLE>
<CAPTION>
                            Seligman Advisors, Inc.
                            -----------------------
                              As of April 30, 1999
                              --------------------

            (1)                             (2)                                          (3)
     Name and Principal              Positions and Offices                       Positions and Offices
     Business Address                with Underwriter                            with Registrant
     ----------------                ----------------                            ---------------
<S>                                  <C>                                        <C>
     Bradford C. Davis               Regional Vice President                     None
     241 110th Avenue SE
     Bellevue, WA  98004
     Christopher J. Derry            Regional Vice President                     None
     2380 Mt. Lebanon Church Road
     Alvaton, KY  42122
     Kenneth Dougherty               Regional Vice President                     None
     8640 Finlarig Drive
     Dublin, OH  43017
     Kelli A. Wirth Dumser           Regional Vice President                     None
     7121 Jardiniere Court
     Charlotte, NC  28226
     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
     Carla A. Goehring               Regional Vice President                     None
     11426 Long Pine
     Houston, TX  77077
     Cathy Des Jardins               Regional Vice President                     None
     PMB 152
     1705 14th Street
     Boulder, CO  80302
     Michael K. Lewallen             Regional Vice President                     None
     908 Tulip Poplar Lane
     Birmingham, AL  35244
     Judith L. Lyon                  Regional Vice President                     None
     7105 Harbour Landing
     Alpharetta, GA  30005
     Tim O'Connell                   Regional Vice President                     None
     11908 Acacia Glen Court
     San Diego, CA  92128
     George M. Palmer, Jr.           Regional Vice President                     None
     1805 Richardson Place
     Tampa, FL  33606
     Thomas Parnell                  Regional Vice President                     None
     1575 Edgecomb Road
     St. Paul, MN  55116
     Craig Prichard                  Regional Vice President                     None
     300 Spyglass Drive
     Fairlawn, OH  44333
</TABLE>

                                      C-6
<PAGE>

                                                                File No. 2-10835
                                                                         811-234

PART C.  OTHER INFORMATION (continued)
- -------  -----------------

<TABLE>
<CAPTION>

                            Seligman Advisors, Inc.
                            -----------------------
                              As of April 30, 1999
                              --------------------

            (1)                            (2)                                     (3)
     Name and Principal             Positions and Offices                  Positions and Offices
     Business Address               with Underwriter                       with Registrant
     ----------------               ----------------                       ---------------
<S>                                 <C>                                   <C>
     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
     Eugene P. Sullivan             Regional Vice President                None
     4858 Battery Lane
     Bethesda, MD  21814
     James Taylor                   Regional Vice President                None
     1145 Kenilworth Circle
     Naperville, IL  60540
     Steve Wilson                   Regional Vice President                None
     83 Kaydeross Park Road
     Saratoga Springs, NY  12866
     Frank J. Nasta*                Secretary                              Secretary
     Aurelia Lacsamana*             Treasurer                              None
     Gail S. Cushing*               Assistant Vice President, National     None
                                    Accounts Manager
     Sandra G. Floris*              Assistant Vice President, Order Desk   None
     Keith Landry*                  Assistant Vice President, Order Desk   None
     Albert A. Pisano*              Assistant Vice President and           None
                                    Compliance Officer
     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.

Item 28.  Location of Accounts and Records.
- --------  ---------------------------------

          Custodian:  Investors Fiduciary Trust Company
                      801 Pennsylvania
                      Kansas City, Missouri 64105 and
                      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 10% 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, as amended.

                                      C-7
<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 certifies that it meets all of
the requirements for effectiveness of this Registration Statement under Rule
485(b) under the Securities Act of 1933 and has duly caused this Post-Effective
Amendment No. 79 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 27th day of May, 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. 79 has been signed below
by the following persons in the capacities indicated on May 27, 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       )

<PAGE>


                                                                File No. 2-10835
                                                                         811-234


                        SELIGMAN COMMON STOCK FUND, INC.
                     Post-Effective Amendment No. 79 to the
                      Registration Statement on Form N-1A


                                 EXHIBIT INDEX

Form N-1A Item No.                  Description
- ------------------                  -----------

Item 23(a)                          Articles Supplementary

Item 23(i)                          Opinion and Consent of Counsel

Item 23 (j)                         Consent of Independent Auditors

Item 23(l)                          Form of Purchase Agreement for Initial
                                    Capital

Item 23(m)                          Amended Administration, Shareholder Services
                                    And Distribution Plan

<PAGE>

                                  Articles I

                        SELIGMAN COMMON STOCK FUND, INC.
                        -------------------------------

                            ARTICLES SUPPLEMENTARY

  Seligman Common Stock Fund, Inc., a Maryland corporation having its principal
office in Baltimore City, Maryland (hereinafter called the "Corporation") and
registered as an open-end investment company under the Investment Company Act of
1940, as amended (the "Investment Company Act"), hereby certifies to the State
Department of Assessments and Taxation of Maryland that:

  FIRST:  The total number of shares of capital stock of all classes which the
Corporation has authority to issue is 500,000,000 shares, which were previously
classified by the Board of Directors of the Corporation into three classes
designated as Class A Common Stock, Class B Common Stock and Class D Common
Stock.  The number of authorized shares of Class A Common Stock, Class B Common
Stock and Class D Common Stock each consisted of the sum of x and y, where x
equaled the issued and outstanding shares of such class and y equaled one-third
of the authorized but unissued shares of Common Stock of all classes; provided
that at all times the aggregate authorized, issued and outstanding shares of
Class A, Class B and Class D Common Stock shall not exceed the authorized number
of shares of Common Stock; and, in the event application of the formula above
would have resulted, at any time, in fractional shares, the applicable number of
authorized shares of each class was to have been rounded down to the nearest
whole number of shares of such class.

  SECOND:  Pursuant to the authority of the Board of Directors to classify and
reclassify unissued shares of capital stock, the Board of Directors has
reclassified the unissued shares of Class A Common Stock, Class B Common Stock
and Class D Common Stock into the following classes and has provided for the
issuance of shares of such classes.  The terms of the Common Stock as set by the
Board of Directors are as follows:

        (a)  The total number of shares of all classes of stock which the
     Corporation has authority to issue is 500,000,000 shares of common stock
     ("Shares") of the par value of $.50 each having an aggregate par value of
     $250,000,000.  The Common Stock of the Corporation shall have four classes
     of shares, which shall be designated Class A Common Stock, Class B Common
     Stock, Class C Common Stock and Class D Common Stock.  The number of
     authorized shares of Class A Common Stock, of Class B Common Stock, of
     Class C Common Stock and of Class D Common Stock shall each consist of the
     sum of x and y, where x equals the issued and outstanding shares of such
     class and y equals one-fourth of the authorized but unissued shares of
     Common Stock of all classes; provided that at all times the aggregate
     authorized, issued and outstanding shares of Class A, Class B, Class C and
     Class D Common Stock shall not exceed the authorized number of shares of
     Common Stock (i.e., 500,000,000 shares of Common Stock until changed by
     further action of the Board of Directors in accordance with Section 2-208.1
     of the Maryland General Corporation Law, or any successor provision); and,
     in the event application of the formula above would result, at any time, in
     fractional shares, the applicable number of authorized shares of each class
     shall be rounded down to the nearest whole number of shares of such

                                      -1-
<PAGE>

     class. Any class of Common Stock shall be referred to herein individually
     as a "Class" and collectively, together with any further class or classes
     from time to time established, as the "Classes".

(b)  All Classes shall represent the same interest in the Corporation and have
     identical voting, dividend, liquidation, and other rights; provided,
     however, that notwithstanding anything in the charter of the Corporation to
     the contrary:

        (1)  Class A shares may be subject to such front-end sales loads as may
     be established by the Board of Directors from time to time in accordance
     with the Investment Company Act and applicable rules and regulations of the
     National Association of Securities Dealers, Inc. (the "NASD").

        (2)  Class B shares may be subject to such contingent deferred sales
     charges as may be established from time to time by the Board of Directors
     in accordance with the Investment Company Act and applicable rules and
     regulations of the NASD. Subject to subsection (6) below, each Class B
     share shall convert automatically into Class A shares on the last business
     day of the month that precedes the eighth anniversary of the date of
     issuance of such Class B share; such conversion shall be effected on the
     basis of the relative net asset values of Class B shares and Class A shares
     as determined by the Corporation on the date of conversion.

        (3)  Class C shares may be subject to such front-end sales loads and
     such contingent deferred sales charges as may be established from time to
     time by the Board of Directors in accordance with the Investment Company
     Act and applicable rules and regulations of the NASD.

        (4)  Class D shares may be subject to such contingent deferred sales
     charges as may be established from time to time by the Board of Directors
     in accordance with the Investment Company Act and applicable rules and
     regulations of the NASD.

        (5)  Expenses related solely to a particular Class (including, without
     limitation, distribution expenses under a Rule 12b-1 plan and
     administrative expenses under an administration or service agreement, plan
     or other arrangement, however designated, which may differ between the
     Classes) shall be borne by that Class and shall be appropriately reflected
     (in the manner determined by the Board of Directors) in the net asset
     value, dividends, distribution and liquidation rights of the shares of that
     Class.

        (6)  At such time as shall be permitted under the Investment Company
     Act, any applicable rules and regulations thereunder and the provisions of
     any exemptive order applicable to the Corporation, and as may be determined
     by the Board of Directors and disclosed in the then current prospectus of
     the Corporation, shares of a

                                      -2-
<PAGE>

     particular Class may be automatically converted into shares of another
     Class; provided, however, that such conversion shall be subject to the
     continuing availability of an opinion of counsel to the effect that such
     conversion does not constitute a taxable event under Federal income tax
     law. The Board of Directors, in its sole discretion, may suspend any
     conversion rights if such opinion is no longer available.

        (7)  As to any matter with respect to which a separate vote of any Class
     is required by the Investment Company Act or by the Maryland General
     Corporation Law (including, without limitation, approval of any plan,
     agreement or other arrangement referred to in subsection (5) above), such
     requirement as to a separate vote by the Class shall apply in lieu of
     single Class voting, and, if permitted by the Investment Company Act or any
     rules, regulations or orders thereunder and the Maryland General
     Corporation Law, the Classes shall vote together as a single Class on any
     such matter that shall have the same effect on each such Class. As to any
     matter that does not affect the interest of a particular Class, only the
     holders of shares of the affected Class shall be entitled to vote.

  THIRD:  These Articles Supplementary do not change the total number of
authorized shares of the Corporation.

     IN WITNESS WHEREOF, SELIGMAN COMMON STOCK FUND, INC. has caused these
Articles Supplementary to be signed in its name and on its behalf by its
President and witnessed by its Secretary, and each of said officers of the
Corporation has also acknowledged these Articles Supplementary to be the
corporate act of the Corporation and has stated under penalties of perjury that
to the best of his knowledge, information and belief that the matters and facts
set forth with respect to approval are true in all material respects, all on May
24, 1999.

                                              SELIGMAN COMMON STOCK FUND, INC.


                                              By:  /s/  Brian T. Zino
                                                  ---------------------------
                                                   Brian T. Zino, President
Witness:

    /s/ Frank J. Nasta
- ------------------------------
 Frank J. Nasta, Secretary

                                      -3-

<PAGE>

                              SULLIVAN & CROMWELL






                                                         May 27, 1999



Seligman Common Stock Fund, Inc.,
   100 Park Avenue,
      New York, N.Y.  10017.


Dear Sirs:

              In connection with Post-Effective Amendment No.79 to the
Registration Statement on Form N-1A (File No. 2-10835) of Seligman Common Stock
Fund, Inc., a Maryland corporation (the "Fund"), which you expect to file under
the Securities Act of 1933, as amended (the "Securities Act"), with respect to
an indefinite number of shares of capital stock, par value $0.500 per share, of
the class designated as Class C shares (the "Shares"), we, as your counsel, have
examined such corporate records, certificates and other documents, and such
questions of law, as we have considered necessary or appropriate for the
purposes of this opinion.

              The number of shares of each class of capital stock that the Fund
is authorized to issue at any time is determined by adding to the number of
shares of such class then outstanding additional authorized shares in an amount
determined according to a formula set forth in the Fund's charter. The formula
allocates to each class an equal portion of the number of shares representing
the difference between the number of shares that the Fund is authorized to issue
and the total number of shares of all classes outstanding at such time.

              Upon the basis of such examination, we advise you that, in our
opinion, the Fund is authorized to issue the number of Shares determined in
accordance with the charter of the Fund as described above and, when the Post-
Effective Amendment referred to above has become effective under the Securities
Act and the Shares have been issued (a) for at least the par value thereof in
accordance with the Registration Statement referred to above, (b) so as not to
exceed the then authorized number of Shares and (c) in accordance with the
authorization of the Board of Directors, the Shares will be duly and validly
issued, fully paid and non-assessable.

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

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

                                                Very truly yours,

                                                SULLIVAN & CROMWELL


<PAGE>


                                                               EXHIBIT 99.23 (j)

CONSENT OF INDEPENDENT AUDITORS

Seligman Common Stock Fund, Inc.:

We consent to the use in Post-Effective Amendment No. 79 to Registration
Statement No. 2-10835 of our report dated January 29, 1999, appearing in the
Annual Reports to Shareholders for the year ended December 31, 1998, which is
incorporated by reference in the Statement of Additional Information, which is
included in such Registration Statement, and to the references to us under the
captions "Financial Highlights" in the Prospectus and "General Information" in
the Statement of Additional Information, which are also included in such
Registration Statement.


DELOITTE & TOUCHE LLP
New York, New York
May 26, 1999


<PAGE>

                              INVESTMENT LETTER 2


                               INVESTMENT LETTER

                       SELIGMAN COMMON STOCK FUND, INC.


Seligman Common Stock Fund, Inc. (the "Fund"), an open-end diversified
management investment company, and the undersigned ("Purchaser"), intending to
be legally bound, hereby agree as follows:

1.   The Fund hereby sells to Purchaser and Purchaser purchases 1 Class C share
     (the "Share") of Capital Stock (par value $.50) of the Fund at a price
     equivalent to the net asset value of one Class D share of the Fund as of
     the close of business on May 27, 1999.  The Fund hereby acknowledges
     receipt from Purchaser of funds in such amount in full payment for the
     Share.

2.   Purchaser represents and warrants to the Fund that the Share is being
     acquired for investment and not with a view to distribution thereof, and
     that Purchaser has no present intention to redeem or dispose of the Share.


IN WITNESS WHEREOF, the parties have executed this agreement as of the 28th day
of May, 1999 ("Purchase Date").


                           SELIGMAN COMMON STOCK FUND, INC.



                           By:________________________________
                           Name:  Lawrence P. Vogel
                           Title: Vice President


                           J. & W. SELIGMAN & CO. INCORPORATED



                           By:________________________________
                           Name:  Brian T. Zino
                           Title: President

<PAGE>

                                 12B-1 PLAN 3


           ADMINISTRATION, SHAREHOLDER SERVICES AND DISTRIBUTION PLAN
           ----------------------------------------------------------

                  As amended and restated through June 1, 1999

  Section 1.  Seligman Common Stock Fund, Inc. (the "Fund") will pay fees to
Seligman Advisors, Inc., the principal underwriter of its shares (the
"Distributor"), for administration, shareholder services and distribution
assistance for the Class A, Class B, Class C and Class D shares of the Fund.  As
a result, the Fund is adopting this Administration, Shareholder Services and
Distribution Plan (the "Plan") pursuant to Section 12(b) of the Investment
Company Act of 1940, as amended (the "Act") and Rule 12b-1 thereunder.

  Section 2. Pursuant to this Plan, the Fund may pay to the Distributor a
shareholder servicing fee of up to .25% on an annual basis of the average daily
net assets of the Fund (payable quarterly with respect to Class A and monthly
with respect to Class B, Class C and Class D) and a distribution fee of .75% on
an annual basis, payable monthly, of the average daily net assets of the Fund
attributable to the Class B Shares and a distribution fee of up to .75% on an
annual basis, payable monthly, of the average daily net assets of the Fund
attributable to Class C and Class D shares.  Such fees will be used in their
entirety by the Distributor to make payments for administration, shareholder
services and distribution assistance, including, but not limited to (i)
compensation to securities dealers and other organizations (each, a "Service
Organization" and collectively, the "Service Organizations"), for providing
distribution assistance with respect to assets invested in the Fund, (ii)
compensation to Service Organizations for providing administration, accounting
and other shareholder services with respect to Fund shareholders, and (iii)
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 the Distributor's costs incurred in connection with its
marketing efforts with respect to shares of the Fund.  To the extent a Service
Organization provides administration, accounting and other shareholder services,
payment for which is not required to be made pursuant to a plan meeting the
requirements of Rule 12b-1, a portion of the fee paid by the Fund shall be
deemed to include compensation for such services.  The fees received from the
Fund hereunder in respect of the Class A shares may not be used to pay any
interest expense, carrying charges or other financing costs, and fees received
hereunder may not be used to pay any allocation of overhead of the Distributor.
The fees of any particular class of the Fund may not be used to subsidize the
sale of shares of any other class.  The fees payable to Service Organizations
from time to time shall, within such limits, be determined by the  Directors of
the Fund.

  Section 3.  J. & W. Seligman & Co. Incorporated, the Fund's investment manager
(the "Manager"), in its sole discretion, may make payments to the Distributor
for similar purposes.  These payments will be made by the Manager from its own
resources, which may include the management fee that the Manager receives from
the Fund.

  Section 4.  This Plan shall continue in effect through December 31 of each
year so long as such continuance is specifically approved at least annually by
vote of a majority of both (a) the Directors of the Fund and (b) the Qualified
Directors, cast in person at a meeting called for the purpose of voting on such
approval.

                                       1
<PAGE>

  Section 5.  The Distributor shall provide to the Fund's Directors, and the
Directors shall review, at least quarterly, a written report of the amounts so
expended and the purposes for which such expenditures were made.

  Section 6.  This Plan may be terminated by the Fund with respect to any class
at any time by vote of a majority of the Qualified Directors, or by vote of a
majority of the outstanding voting securities of such class.  If this Plan is
terminated in respect of a class, no amounts (other than amounts accrued but not
yet paid) would be owed by the Fund to the Distributor with respect to such
class.

  Section 7.  All agreements related to this Plan shall be in writing, and shall
be approved by vote of a majority of both (a) the Directors of the Fund and (b)
the Qualified Directors, cast in person at a meeting called for the purpose of
voting on such approval, provided, however, that the identity of a particular
Service Organization executing any such agreement may be ratified by such a vote
within 90 days of such execution.  Any agreement related to this Plan shall
provide:

     A.   That such agreement may be terminated in respect of any class of the
          Fund at any time, without payment of any penalty, by vote of a
          majority of the Qualified Directors or by vote of a majority of the
          outstanding voting securities of the class, on not more than 60 days'
          written notice to any other party to the agreement; and

     B.   That such agreement shall terminate automatically in the event of its
          assignment.

  Section 8.  This Plan may not be amended to increase materially the amount of
fees permitted pursuant to Section 2 hereof without the approval of a majority
of the outstanding voting securities of the relevant class and no material
amendment to this Plan shall be approved other than by vote of a majority of
both (a) the Directors of the Fund and (b) the Qualified Directors, cast in
person at a meeting called for the purpose of voting on such approval. This Plan
shall not be amended to reduce the distribution fee payable to the Distributor
pursuant to Section 2 hereof in respect of Class B shares, unless the
shareholder servicing fee payable pursuant to Section 2 hereof for compensation
to Service Organizations for providing administration, accounting and other
shareholder services has been eliminated, provided, however that the
distribution fee in respect of Class B shares may be reduced without change to
the shareholder servicing fee, if and to the extent required in order to comply
with any applicable laws or regulations, including applicable rules of the
National Association of Securities Dealers, Inc. regulating maximum sales
charges.

  Section 9.  The Fund is not obligated to pay any administration, shareholder
services or distribution expense in excess of the fee described in Section 2
hereof, and, in the case of Class A shares, any expenses of administration,
shareholder services and distribution of Class A shares of the Fund accrued in
one fiscal year of the Fund may not be paid from administration, shareholder
services and distribution fees received from the Fund in respect of Class A
shares in any other fiscal year.

                                       2
<PAGE>

  Section 10.  As used in this Plan, (a) the terms "assignment", "interested
person" and "vote of a majority of the outstanding voting securities" shall have
the respective meanings specified in the Act and the rules and regulations
thereunder, subject to such exemptions as may be granted by the Securities and
Exchange Commission and (b) the term "Qualified Directors" shall mean the
Directors of the Fund who are not "interested persons" of the Fund and have no
direct or indirect financial interest in the operation of this Plan or in any
agreement related to this Plan.

                                       3


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