CALVERT MUNICIPAL FUND INC
485APOS, 1999-03-01
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SEC Registration Nos.
811-6525 and 33-44968


                      SECURITIES AND EXCHANGE COMMISSION
                            Washington, D.C. 20549

                                  FORM N-1A

                       REGISTRATION STATEMENT UNDER THE
                            SECURITIES ACT OF 1933


                      Post-Effective Amendment No. 16 XX

                                    and/or

                       REGISTRATION STATEMENT UNDER THE
                        INVESTMENT COMPANY ACT OF 1940

                             Amendment No. 16 XX

                         Calvert Municipal Fund, Inc.
              (Exact Name of Registrant as Specified in Charter)

                            4550 Montgomery Avenue
                                 Suite 1000N
                           Bethesda, Maryland 20814
                   (Address of Principal Executive Offices)

                        Registrant's Telephone Number:
                                (301) 951-4881

                          William M. Tartikoff, Esq.
                            4550 Montgomery Avenue
                                 Suite 1000N
                           Bethesda, Maryland 20814
                   (Name and Address of Agent for Service)


It is proposed that this filing will become effective

__ Immediately upon filing                  __ on (date)
pursuant to paragraph (b)                   pursuant to paragraph (b)

XX 60 days after filing                     __ on (date)
pursuant to paragraph (a)                   pursuant to paragraph (a)

of Rule 485.

<PAGE>

                         CALVERT MUNICIPAL FUND, INC.
                 CALVERT NATIONAL MUNICIPAL INTERMEDIATE FUND
                CALVERT CALIFORNIA MUNICIPAL INTERMEDIATE FUND
                 CALVERT MARYLAND MUNICIPAL INTERMEDIATE FUND
                 CALVERT VIRGINIA MUNICIPAL INTERMEDIATE FUND
                                  PROSPECTUS
                                April 30, 1999

About the Funds
2        Investment objective, strategy, past performance
18       Fees and Expenses
22       Principal Investment Practices and Risks

About Your Investment
32       Calvert Group and the Portfolio Management Team
34       Advisory Fees
36       How to Buy Shares
36       Getting Started
36       Choosing a Share Class
38       Calculation of CDSC/Waiver
39       Distribution and Service Fees
40       Account Application
41       Important - How Shares are Priced
41       When Your Account Will be Credited
42       Other Calvert Group Features
         (Exchanges, Minimum Account Balance, etc.)
45       Dividends, Capital Gains and Taxes
46       How to Sell Shares
48       Financial Highlights
57       Exhibit A- Reduced Sales Charges (Class A)
59       Exhibit B- Service Fees and
         Other Arrangements with Dealers

These securities have not been approved or disapproved by the Securities and
Exchange Commission (SEC) or any State Securities Commission, nor has the
SEC or any State Securities Commission passed on the accuracy or adequacy of
this prospectus. Any representation to the contrary is a criminal offense.

<PAGE>

Calvert National Municipal Intermediate Fund

Objective
Calvert National Municipal Intermediate Fund ("National") seeks to earn the
highest level of interest income exempt from federal income taxes as is
consistent with prudent investment management, preservation of capital, and
certain quality and maturity characteristics.

Calvert California, Maryland and Virginia Municipal Intermediate Funds (the
"State Funds") seek to earn the highest level of interest income exempt from
federal and specific state income taxes as is consistent with prudent
investment management, preservation of capital, and the quality and maturity
objectives of each Fund.

Principal investment strategies

National and the State Funds ("each Fund" or the "Funds") are each
nondiversified mutual funds.  Each Fund typically invests at least 65% of
its net assets in investment grade debt securities.  The Advisor looks for
securities with strong credit quality within their rating category that are
attractively priced.  This may include investments with unusual features or
privately placed issues, that are not widely followed in the fixed income
marketplace. The average dollar-weighted maturity will be between 3 and 10
years.

Types of investments.  The tax-exempt obligations in which the Fund may
invest include, but are not limited to, tax-supported debt (general
obligation bonds of state and local issuers), various types of revenue debt
(transportation, housing utilities, hospital), special tax obligations, and
qualified private activity bonds and other state and local government
authorities, municipal leases, certificates of participation in such
investments. The obligations may be structured as variable rate or
adjustable rate obligations and are often supported by a third party letter
of credit.

Under normal market conditions, each Fund will invest at least 65% of its
total assets in municipal obligations whose interest is exempt from federal,
and, if a State Fund, that specific state's income tax.  The Fund will also
attempt to invest the remaining 35% of its total assets in such obligations,
but may invest it in municipal obligations of other states, territories and
possessions of the United States, the District of Columbia and their
respective authorities, agencies, instrumentalities and political
subdivisions or in short-term taxable money market-type instruments.
Dividends paid by the State Funds which are derived from interest
attributable to state municipal obligations will be exempt from federal and
that specific state's personal income taxes.  Dividends derived from
interest on tax-exempt obligations of other governmental issuers will be
exempt from federal income tax, but may be subject to state income taxes.

Because the State Funds invest primarily in California, Maryland, and
Virginia municipal obligations, respectively, the economy and political
climate in those states have a great impact on the State Funds.

The Funds may purchase unrated securities, so long as the Advisor determines
they are of comparable credit quality.  Unrated securities may be less
liquid than those that are rated.

Principal risks
You could lose money on your investment in the Funds, or the Funds could
underperform, most likely for any of the following reasons:

      The bond market goes down
      The individual bonds in the Funds do not perform as well as expected
      The Advisor's forecast as to interest rates is not correct
      The Advisor's allocation among different sectors of the bond market
     does not perform as well as expected
      The Funds are non-diversified. Compared to other funds, the Funds may
     invest more of its assets in a smaller number of bonds. Gains or losses
     on a single bond may have greater impact on the Funds.

An investment in the Funds is not a bank deposit and is not insured or
guaranteed by the Federal Deposit Insurance Corporation or any other
government agency.

Performance Charts

The bar charts and tables below show each Fund's annual returns and its
long-term performance. The chart shows how the performance of the Class A
shares has varied from year to year. The table compares each Fund's
performance over time to that of the Lehman Municipal 10 year Bond Index TR. 
This is a widely recognized, unmanaged index of bond prices. It also shows the
Fund's returns compared to the Lipper Other States Municipal Debt Funds Index, 
a composite index of the annual return of mutual funds that have an investment
goal similar to that of the Fund. Past performance does not necessarily
indicate how any Fund will perform in the future.

The return for the Fund's other Classes of shares offered by this prospectus
will differ from the Class A returns shown in the bar chart, depending upon
the expenses of that Class. The bar chart does not reflect any sales charge
that you may be required to pay upon purchase or redemption of the Fund's
shares. Any sales charge will reduce your return. The average total return
table shows returns with the maximum sales charge deducted. No sales charge
has been applied to the index used for comparison in the table.

Bar Chart with Year-by-Year Total Return
(Class A return at NAV)
1989     ____%    1994     ____%
1990     ____%    1995     ____%
1991     ____%    1996     ____%
1992     ____%    1997     ____%
1993     ____%    1998     ____%

Best Quarter (of periods shown)     Q__'__  ____%
Worst Quarter (of periods shown)    Q__'__  ____%

Average Annual Total Returns (as of 12-31-98)
(with maximum sales charge deducted)

                                        1 year     5 years    10 years
National, Class A                       ____%      ____%      N/A
National, Class B                       N/A        N/A        N/A
National, Class C                       N/A        N/A        N/A
Lehman Municipal Bond 10 year 
     Index TR                           ____%      ____%      ____%
Lipper Other States Municipal Debt
     Funds Index                        ____%      ____%      ____%

                                        1 year     5 years    10 years
California, Class A                     ____%      ____%      N/A
California, Class B                     N/A        N/A        N/A
California, Class C                     N/A        N/A        N/A
Lehman Municipal Bond 10 year 
     Index TR                           ____%      ____%      ____%
Lipper Other States Municipal Debt
     Funds Index                        ____%      ____%      ____%

                                        1 year     5 years    10 years
Maryland, Class A                       ____%      ____%      N/A
Maryland, Class B                       N/A        N/A        N/A
Maryland, Class C                       N/A        N/A        N/A
Lehman Municipal Bond 10 year 
     Index TR                           ____%      ____%      ____%
Lipper Other States Municipal Debt
     Funds Index                        ____%      ____%      ____%

                                        1 year     5 years    10 years
Virginia, Class A                       ____%      ____%      N/A
Virginia, Class B                       N/A        N/A        N/A
Virginia, Class C                       N/A        N/A        N/A
Lehman Municipal Bond 10 year 
     Index TR                           ____%      ____%      ____%%
Lipper Other States Municipal Debt
     Funds Index                        ____%      ____%      ____%

<PAGE>

Fees and expenses

This table describes the fees and expenses that you may pay if you buy and
hold shares of a Fund. Shareholder fees are paid directly from your account;
annual Fund operating expenses are deducted from Fund assets.

National                                Class A      Class B      Class C

Maximum sales charge (load)             2.75%        None         None
     imposed on purchases
     (as a percentage of offering price)
Maximum deferred sales charge (load)    None1        3% 2         1% 3
     (as a percentage of purchase or redemption
     proceeds, whichever is lower)

Annual fund operating expenses

Management fees                         0.70%        0.70%        0.70%
Distribution and service (12b-1) fees   0.00%        1.00%        1.00%
Other expenses                          _.__%        _.__%        _.__%
Total annual fund operating expenses    _.__%        _.__%        _.__%

California                              Class A      Class B      Class C

Maximum sales charge (load)             2.75%        None         None
     imposed on purchases
     (as a percentage of offering price)
Maximum deferred sales charge (load)    None1        3% 2         1% 3
     (as a percentage of purchase or redemption
     proceeds, whichever is lower)

Annual fund operating expenses

Management fees                         0.70%        0.70%        0.70%
Distribution and service (12b-1) fees   0.00%        1.00%        1.00%
Other expenses                          _.__%        _.__%        _.__%
Total annual fund operating expenses    _.__%        _.__%        _.__%

Maryland                                Class A      Class B      Class C

Maximum sales charge (load)             2.75%        None         None
     imposed on purchases
     (as a percentage of offering price)
Maximum deferred sales charge (load)    None1        3% 2         1% 3
     (as a percentage of purchase or redemption
     proceeds, whichever is lower)

Annual fund operating expenses

Management fees                         0.70%        0.70%        0.70%
Distribution and service (12b-1) fees   0.00%        1.00%        1.00%
Other expenses                          _.__%        _.__%        _.__%
Total annual fund operating expenses    _.__%        _.__%        _.__%

Virginia                                Class A      Class B      Class C

Maximum sales charge (load)             2.75%        None         None
     imposed on purchases
     (as a percentage of offering price)
Maximum deferred sales charge (load)    None1        3% 2         1% 3
     (as a percentage of purchase or redemption
     proceeds, whichever is lower)

Annual fund operating expenses

Management fees                         0.70%        0.70%        0.70%
Distribution and service (12b-1) fees   0.00%        1.00%        1.00%
Other expenses                          _.__%        _.__%        _.__%
Total annual fund operating expenses    _.__%        _.__%        _.__%

Explanation of Fees and Expenses Table

1 Purchases of Class A shares for accounts with $1 million or more are not
subject to front-end sales charges, but may be subject to a 1.0% contingent
deferred sales charge on shares redeemed within 1 year of purchase. (See
"How to Buy Shares - Class A)
2 A contingent deferred sales charge is imposed on the proceeds of Class B
shares of the Fund redeemed within 4 years, subject to certain exceptions.
The charge is a percentage of net asset value at the time of purchase or
redemption, whichever is less, and declines from 3% in the first year that
shares are held, to 2% in the second, 2% in the third year, and 1% in the
fourth year. There is no charge on redemptions of Class B shares held for
more than four years. See "Calculation of Contingent Deferred Sales Charge"
3 A contingent deferred sales charge is imposed on the proceeds of Class C
shares redeemed within one year. The charge is a percentage of net asset
value at the time of purchase or redemption, whichever is less. See
"Calculation of Contingent Deferred Sales Charge"

Annual Fund Operating Expenses
Expenses are based on expenses for each Fund's most recent fiscal year,
unless otherwise indicated. Management fees include the administrative fee
paid by the Fund to Calvert Administrative Services Company, an affiliate of
the Advisor, Calvert Asset Management Company, Inc. ("CAMCO").

Rule 12b-1 fees include an asset-based sales charge. Thus, long-term
shareholders in those Funds with such fees may pay more in total sales
charges than the economic equivalent of the maximum front-end sales charge
permitted by rules of the National Association of Securities Dealers, Inc.
(the "NASD").

<PAGE>

Example
This example is intended to help you compare the cost of investing in a Fund
with the cost of investing in other mutual funds. The example assumes that:
You invest $10,000 in a Fund for the time periods indicated;
Your investment has a 5% return each year; and
The Fund's operating expenses remain the same.

Although your actual costs may be higher or lower, under these assumptions
your costs would be:

National
                    Number of Years Investment is Held
Class               1 year       3 years       5 years      10 years
A                   $__          $__           $__          $__
B w/redemption      $__          $__           $__          $__
B w/o redemption    $__          $__           $__          $__
C w/ redemption     $__          $__           $__          $__
C w/o redemption    $__          $__           $__          $__

California
                    Number of Years Investment is Held
Class               1 year       3 years       5 years      10 years
A                   $__          $__           $__          $__
B w/redemption      $__          $__           $__          $__
B w/o redemption    $__          $__           $__          $__
C w/ redemption     $__          $__           $__          $__
C w/o redemption    $__          $__           $__          $__

Maryland
                    Number of Years Investment is Held
Class               1 year       3 years       5 years      10 years
A                   $__          $__           $__          $__
B w/redemption      $__          $__           $__          $__
B w/o redemption    $__          $__           $__          $__
C w/ redemption     $__          $__           $__          $__
C w/o redemption    $__          $__           $__          $__

Virginia
                    Number of Years Investment is Held
Class               1 year       3 years       5 years      10 years
A                   $__          $__           $__          $__
B w/redemption      $__          $__           $__          $__
B w/o redemption    $__          $__           $__          $__
C w/ redemption     $__          $__           $__          $__
C w/o redemption    $__          $__           $__          $__

<PAGE>

Principal Investment Practices and Risks

The most concise description of each Fund's principal investment strategies
and associated risks is under the risk-return summary for each Fund. The
Funds are also permitted to invest in certain other investments and to use
certain investment techniques that have higher risks associated with them.
On the following pages are brief descriptions of the investments and
techniques, summarized in the risk-return summary along with certain
additional investment techniques and their risks.

For each of the investment practices listed, the table below shows each
Fund's limitations as a percentage of its assets and the principal types of
risk involved. (See the pages following the table for a description of the
types of risks). Numbers in this table show maximum allowable amount only;
for actual usage, consult the Fund's annual/semi-annual reports.

Key to Table
@        Fund currently uses
0        Permitted, but not typically used
(% of assets allowable, if restricted)
- --       Not permitted
xN       Allowed up to x% of fund's net assets
xT       Allowed up to x% of Fund's total assets
NA       Not applicable to this type of fund

                                          Nat'l.   CA       MD       VA
- ------------------------------------------ -------- -------- -------- -------
Conventional Securities:

Investment grade bonds. Bonds rated        @        @        @        @
BBB/Baa or higher or comparable unrated
bonds. Risks: Interest Rate, Market ,
Credit and Information.

- ------------------------------------------ -------- -------- -------- -------
- ------------------------------------------ -------- -------- -------- -------
Below-investment grade bonds. Bonds        @        @        @        @
rated below BBB/Baa or comparable          (35N)    (35N)    (35N)    (35N)
unrated bonds, also known as high-yield
bonds. They are subject to greater
credit risk than investment grade bonds.
Risks: Credit, Market, Interest Rate,
Liquidity and Information.

Unrated debt securities. Bonds that have   @        @        @        @
not been rated by a recognized rating
agency; the Advisor has determined the
credit quality based on its own
research. Risks: Credit, Market,
Interest Rate, Liquidity and Information.

- ------------------------------------------ -------- -------- -------- -------
- ------------------------------------------ -------- -------- -------- -------
Illiquid securities. Securities which      15N      15N      15N      15N
cannot be readily sold because there is
no active market. Risks: Liquidity,
Market and Transaction.

- ------------------------------------------ -------- -------- -------- -------
- ------------------------------------------ -------- -------- -------- -------
Unleveraged derivative securities

Asset-backed securities. Securities are    @        @        @        @
issued by a special purpose entity and
are backed by fixed-income or other
interest bearing assets.  Risks: Credit,
Interest Rate and Liquidity.

- ------------------------------------------ -------- -------- -------- -------
- ------------------------------------------ -------- -------- -------- -------
Mortgage-backed securities (typically,
single-family mortgage bonds).             @        @        @        @
Securities are backed by pools of
mortgages, including passthrough
certificates.  Risks: Credit, Extension,
Prepayment, Liquidity and Interest Rate.

- ------------------------------------------ -------- -------- -------- -------
- ------------------------------------------ -------- -------- -------- -------
Leveraged derivative instruments
- ------------------------------------------ -------- -------- -------- -------
- ------------------------------------------ -------- -------- -------- -------
Options on securities and indices.         5N       5N       5N       5N
Contracts giving the holder the right
but not the obligation to purchase or
sell a security (or the cash value, in
the case of an option on an index) at a
specified price within a specified time.
Any options written by the Fund must be
"covered". Risks: Interest Rate,
Currency, Market, Leverage, Correlation,
Liquidity, Credit and Opportunity.

- ------------------------------------------ -------- -------- -------- -------
- ------------------------------------------ -------- -------- -------- -------
Futures contract. Agreement to buy or
sell a specific amount of a commodity or   5N       5N       5N       5N
financial instrument at a particular
price on a specific future date. Risks:
Interest Rate, Currency, Market,
Leverage, Correlation, Liquidity and
Opportunity.

- ------------------------------------------ -------- -------- -------- -------
- ------------------------------------------ -------- -------- -------- -------
Structured securities
Inverse floating rate municipal notes
and bonds.  These securities tend to be    @        @        @        @
highly sensitive to interest rate
movements.  Risks: Credit, Interest
Rate, Market, Leverage, Liquidity and
Correlation.

- ------------------------------------------ -------- -------- -------- -------
- ------------------------------------------ -------- -------- -------- -------
Investment Practices:

Temporary Defensive Positions.             0        0        0        0
During adverse market, economic or         (20T)    (20T)    (35T)    (35T)
political conditions, the Fund may
depart from its principal investment
strategies by increasing its investment
in U.S. government securities and other
short-term interest-bearing securities.
During times of any temporary defensive
positions, a Fund may not be able to
achieve its investment objective Risks:
Opportunity.

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

The Funds have additional investment policies and restrictions that are not
principal to their investment strategies (for example, repurchase
agreements, borrowing, pledging, and securities lending, and when-issued
securities.) These policies and restrictions are discussed in the SAI.

Correlation risk
This occurs when a Fund "hedges"- uses one investment to offset the Fund's
position in another. If the two investments do not behave in relation to one
another the way Fund managers expect them to, then unexpected or undesired
results may occur. For example, a hedge may eliminate or reduce gains as
well as offset losses.

Credit risk
The risk that the issuer of a security or the counterparty to an investment
contract may default or become unable to pay its obligations when due.

Extension risk
The risk that an unexpected rise in interest rates will extend the life of a
mortgage-backed security beyond the expected prepayment time, typically
reducing the security's value.

Information risk
The risk that information about a security or issuer or the market might not
be available, complete, accurate or comparable.

Interest rate risk
The risk that changes in interest rates will adversely affect the value of
an investor's securities. When interest rates rise, the value of
fixed-income securities will generally fall. Conversely, a drop in interest
rates will generally cause an increase in the value of fixed-income
securities. Longer-term securities and zero coupon/"stripped" coupon
securities ("strips") are subject to greater interest rate risk.

Leverage risk
The risk that occurs in some securities or techniques which tend to magnify
the effect of small changes in an index or a market. This can result in a
loss that exceeds the amount actually invested.

Liquidity risk
The risk that occurs when investments cannot be readily sold. A Fund may
have to accept a less-than-desirable price to complete the sale of an
illiquid security or may not be able to sell it at all.

Management risk
This risk exists in all mutual funds and means that a Fund's portfolio
management practices might not work to achieve their desired result.

Market risk
The risk that exists in all mutual funds and means the risk that securities
prices in a market, a sector or an industry will fluctuate, and that such
movements might reduce an investment's value.

Opportunity risk
The risk of missing out on an investment opportunity because the assets
needed to take advantage of it are committed to less advantageous
investments or strategies.

Political risk
The risk that may occur with foreign investments, and means that the value
of an investment may be adversely affected by nationalization, taxation,
war, government instability or other economic or political actions or
factors.

Prepayment risk
The risk that unanticipated prepayments may occur, reducing the value of a
mortgage-backed security. The Fund must then reinvest those assets at the
current, market rate which may be lower.

Transaction risk
The risk that a Fund may be delayed or unable to settle a transaction or
that commissions and settlement expenses may be higher than usual.

About Calvert Group
Calvert Asset Management Company, Inc. (4550 Montgomery Avenue, Suite 1000N,
Bethesda, MD 20814) ("CAMCO") is the Funds' investment advisor and provides
day-to-day investment management services to the Funds. It has been managing
mutual funds since 1976. CAMCO is the investment advisor for over 25 mutual
funds. As of December 31, 1998, CAMCO had $6 billion in assets under
management.

CAMCO uses a team approach to its management of the Fund. Since inception,
investment selections for the Fund have been made by Reno J. Martini and
Daniel K. Hayes. Mr. Martini, Senior Vice President and Chief Investment
Officer of CAMCO, oversees the investment management of all Calvert Funds
for CAMCO. Mr. Martini has over 18 years of experience in evaluating and
purchasing municipal securities and has been the head of CAMCO's asset
management team since 1985. Mr. Hayes serves as head of Portfolio Research
and has been a portfolio manager for CAMCO since 1984. He is a Vice
President of CAMCO, and is an officer of each of the other investment
companies in the Calvert Group of Funds, except for Calvert New World Fund,
Inc.

Advisory Fees

The aggregate annual advisory fee paid to CAMCO by the Fund for the most
recent fiscal year as a percentage of that Fund's average daily net assets
was 0.60%.

A Word About the Year 2000 (Y2K) and Our Computer Systems

Like other mutual funds, CAMCO and its service providers use computer
systems for all aspects of our business -- processing shareholder and fund
transactions, fund accounting, executing trades, and pricing securities just
to name a few. Many current software programs cannot distinguish between the
year 2000 and the year 1900. This can cause problems with retirement plan
distributions, dividend payment software, transaction software, and numerous
other areas that could impact the Funds. Calvert Group has been reviewing
all of its computer systems for Y2K compliance. Although, at this time,
there can be no assurance that there will be no negative impact on the
Funds, the Advisor, the underwriter, transfer agent and custodian have
advised the Funds that they have been actively working on any necessary
changes to their computer systems to prepare for Y2K and expect that their
systems, and those of their outside service providers, will be adapted in
time for that event. For more information, please visit our website at
www.calvertgroup.com.

HOW TO BUY SHARES

Getting Started - Before You Open an Account
You have a few decisions to make before you open an account in a mutual fund.

First, decide which fund or funds best suits your needs and your goals.

Second, decide what kind of account you want to open. Calvert offers
individual, joint, trust, Uniform Gift/Transfer to Minor Accounts, and
several other types of accounts. Minimum investments are lower for the
retirement plans.

Then decide which class of shares is best for you.

You should make this decision carefully, based on:
the amount you wish to invest;
the length of time you plan to keep the investment; and
the Class expenses.

Choosing a Share Class

Each Fund offers three different Classes (Class A, B, or C). This chart
shows the difference in the Classes and the general types of investors who
may be interested in each Class:

Class A: Front-End        Class B: Deferred       Class C: Deferred
Sales Charge              Sales Charge for 4      Sales Charge for 1 year
                          years

For all investors,        For investors who       For investors who are
particularly those        plan to hold the        investing for at least
investing a substantial   shares at least 4       one year, but less
amount who plan to hold   years. The expenses     than four years. The
the shares for a long     of this class are       expenses of this Class
period of time.           higher than Class A,    are higher than Class
                          because of the 12b-1    A, because of the
                          fee.                    12b-1 fee.

Sales charge on each      No sales charge on      No sales charge on
purchase of 3.75% or      each purchase, but if   each purchase, but if
less, depending on the    you sell your shares    you sell shares within
amount you invest.        within 4 years, you     1 year, then you will
                          will pay a deferred     pay a deferred sales
                          sales charge of 3% or   charge of 1% at that
                          less on shares you      time.
                          sell.

Class A shares have       Class B shares have     Class C shares have an
an annual 12b-1 fee       an annual 12b-1 fee     annual 12b-1 fee of
of 0.25%.                 of 1.00%.               1.00%.

                          Your shares will        Class C shares have
                          automatically convert   higher annual expenses
                          to Class A shares       than Class A and there
                          after 4 years,          is no automatic
                          reducing your future    conversion to Class A.
                          annual expenses.

Purchases of Class A      If you are investing    If you are investing
shares at NAV for         more than $250,000,     more than $100,000,
accounts with             you should consider     you should invest in
$1,000,000 or more will   investing in Class A.   Class A.
be subject to a 1.0%
deferred sales charge
for 1 year.

Class A
If you choose Class A, you will pay a sales charge at the time of each
purchase. This table shows the charges both as a percentage of offering
price and as a percentage of the amount you invest. The term "offering
price" includes the front-end sales charge. If you invest more, the sales
charge will be lower. For example, if you invest more than $50,000, or if
your cumulative purchases or the value in your account is more than
$50,000,4 then the sales charge is reduced to 2.25%.

Your investment in                        Sales Charge %      % of Amt.
Class A shares                            of offering price   Invested
Less than $50,000                         2.75%               2.83%
$50,000 but not less than $100,000        2.25%               2.30%
$100,000 but not less than $250,000       1.75%               1.78%
$250,000 but not less than $500,000       1.25%               1.27%
$500,000 but not less than $1,000,000     1.00%               1.01%
$1,000,000 and over                       None*               None*

4 This is called "Rights of Accumulation." The sales charge is calculated by
taking into account not only the dollar amount of the new purchase of
shares, but also the higher of cost or current value of shares you have
previously purchased in Calvert Group Funds that impose sales charges. This
automatically applies to your account for each new purchase of Class A
shares.

* Purchases of Class A shares at NAV for accounts with $1,000,000 or more
are subject to a one year CDSC of 1.00%. See the "Calculation of Contingent
Deferred Sales Charge and Waiver of Sales Charges."

The Class A front-end sales charge may be waived for certain purchases or
investors, such as participants in certain group retirement plans or other
qualified groups and clients of registered investment advisers. For details
on these and other purchases that may qualify for a reduced sales charge,
see Exhibit A.

Class B
If you choose Class B, there is no front-end sales charge like Class A, but
if you sell the shares within the first 4 years, you will have to pay a
"contingent deferred" sales charge ("CDSC"). This means that you do not have
to pay the sales charge unless you sell your shares within the first 4 years
after purchase. Keep in mind that the longer you hold the shares, the less
you will have to pay in deferred sales charges.

Time Since Purchase            CDSC %
- ------------------------------ -----------
- ------------------------------ -----------
1st year                       3%
- ------------------------------ -----------
- ------------------------------ -----------
2nd year                       2%
- ------------------------------ -----------
- ------------------------------ -----------
3rd year                       2%
- ------------------------------ -----------
- ------------------------------ -----------
4th year                       1%
- ------------------------------ -----------
- ------------------------------ -----------
5th year                       None
- ------------------------------ -----------
- ------------------------------ -----------
6th year                       None
- ------------------------------ -----------
- ------------------------------ -----------
After 6 years                  None

Calculation of Contingent Deferred Sales Charge and Waiver of Sales Charges
The CDSC will not be charged on shares you received as dividends or from
capital gains distributions or on any capital appreciation (gain in the
value) of shares that are sold.

Shares that are not subject to the CDSC will be redeemed first, followed by
shares you have held the longest. The CDSC is calculated by determining the
share value at both the time of purchase and redemption and then multiplying
whichever value is less by the percentage that applies as shown above. If
you choose to sell only part of your shares, the capital appreciation for
those shares only is included in the calculation, rather than the capital
appreciation for the entire account.

The CDSC on Class B Shares will be waived in the following circumstances:

Redemption upon the death or disability of the shareholder, plan
participant, or beneficiary.1
Minimum required distributions from retirement plan accounts for
shareholders 70 1/2 and older.2
The return of an excess contribution or deferral amounts, pursuant to
sections 408(d)(4) or (5), 401(k)(8), 402(g)(2), or 401(m)(6) of the
Internal Revenue Code.
Involuntary redemptions of accounts under procedures set forth by the Fund's
Board of Trustees/Directors.
A single annual withdrawal under a systematic withdrawal plan of up to 10%
per year of the shareholder's account balance.3

1 "Disability" means a total disability as evidenced by a determination by
the federal Social Security Administration.
2 The maximum amount subject to this waiver is based only upon the
shareholder's Calvert Group retirement accounts.
3 This systematic withdrawal plan requires a minimum account balance of
$50,000 to be established.

Class C
If you choose Class C, there is no front-end sales charge like Class A, but
if you sell the shares within the first year, you will have to pay a 1%
CDSC. Class C may be a good choice for you if you plan to buy shares and
hold them for at least 1 year, but not more than four years.

Distribution and Service Fees
The Funds have adopted a plan under Rule 12b-1 of the Investment Company Act
of 1940 that allows each Fund to pay distribution fees for the sale and
distribution of its shares. The distribution plan also pays service fees to
persons (such as your financial professional) for services provided to
shareholders. Because these fees are paid out of a Fund's assets on an
ongoing basis, over time, these fees will increase the cost of your
investment and may cost you more than paying other types of sales charges.
Please see Exhibit B for more service fee information.

The maximum annual percentage payable under the distribution plan totals 0.25%
for Class A and 1.00% for Class B and C, based on average daily net assets of
the particular Class.

Next Step - Account Application

Complete and sign an application for each new account. When multiple classes
of shares are offered, please specify which class you wish to purchase. For
more information, contact your broker or our shareholder services department
at 800-368-2748.

Minimum To Open an Account                  Minimum additional
$2,000                                      investments -$250

Please make your check payable
to the Fund and mail it to:
              New Accounts                  Subsequent Investments
              (include application)         (include investment slip)
              Calvert Group                 Calvert Group
              P.O. Box 419544               P.O. Box 419739
              Kansas, City MO               Kansas City, MO
              64141-6544                    64141-6739

By Registered,                 Calvert Group
Certified, or                  c/o NFDS,
Overnight Mail                 330 West 9th St.,
                               Kansas City, MO 64105-1807

At the Calvert Office          Visit the Calvert Office to make
                               investments by check. See the back
                               cover page for the address.

Important - How Shares are Priced
The price of shares is based on each Fund's net asset value ("NAV"). NAV is
computed by adding the value of a Fund's holdings plus other assets,
subtracting liabilities, and then dividing the result by the number of
shares outstanding. If a Fund has more than one class of shares, the NAV of
each class will be different, depending on the number of shares outstanding
for each class.

Portfolio securities and other assets are valued based on market quotations,
except that securities maturing within 60 days are valued at amortized cost.
If market quotations are not readily available, securities are valued by a
method that the Fund's Board of Trustees/Directors believes accurately
reflects fair value.

The NAV is calculated as of the close of each business day, which coincides
with the closing of the regular session of the New York Stock Exchange
("NYSE") (normally 4 p.m. ET). Each Fund is open for business each day the
NYSE is open. Please note that there are some federal holidays, however,
such as Columbus Day and Veterans' Day, when the NYSE is open and the Fund
is open but purchases cannot be made due to the closure of the banking
system.

When Your Account Will Be Credited
Before you buy shares, please read the following information to make sure
your investment is credited properly and in a timely manner.

      Your purchase will be processed at the NAV next calculated after your
     order is received.
      All of your purchases must be made in US dollars and checks must be
     drawn on US banks.
      No cash will be accepted.
      No credit card or credit loan checks will be accepted.
      Each Fund reserves the right to suspend the offering of shares for a
     period of time or to reject any specific purchase order.
      As a convenience, check purchases received at Calvert's office in
     Bethesda, Maryland will be sent by overnight delivery to the Transfer
     Agent and will be credited the next business day upon receipt.
      Any check purchase received without an investment slip may cause
     delayed crediting.
      If your check does not clear your bank, your purchase will be canceled
     and you will be charged a $10 fee plus any costs incurred.
      Check or electronic funds transfer purchases will be on hold for up to
     10 business days.
      All purchases will be confirmed and credited to your account in full
     and fractional shares (rounded to the nearest 1/100th of a share).
     Monthly statements may be sent in lieu of confirmations of purchases
     and redemptions.

Earning Dividends
If the Transfer Agent receives your wire purchase by 5 p.m. ET, your account
will begin earning dividends on the next business day. Exchanges begin
earning dividends the next business day after the exchange request is
received by mail or telephone. Purchases received by check will begin
earning dividends the next business day after they are credited to the
account.

OTHER CALVERT GROUP FEATURES

CALVERT INFORMATION NETWORK
For 24 hour performance and account information call 800-368-2745 or visit
http://www.calvertgroup.com
You can obtain current performance and pricing information, verify account
balances, and authorize certain transactions with the convenience of one
phone call, 24 hours a day.

ACCOUNT SERVICES
By signing up for services when you open your account, you avoid having to
obtain a signature guarantee. If you wish to add services at a later date, a
signature guarantee to verify your signature may be obtained from any bank,
trust company and savings and loan association, credit union, broker-dealer
firm or member of a domestic stock exchange. A notary public cannot provide
a signature guarantee.

CALVERT MONEY CONTROLLER
Calvert Money Controller allows you to purchase or sell shares by electronic
funds transfer without the time delay of mailing a check or the added
expense of a wire. Use this service to transfer up to $300,000
electronically. Allow one or two business days after you place your request
for the transfer to take place. Money transferred to purchase new shares
will be subject to a hold of up to 10 business days before redemption
requests will be honored. Transaction requests must be received by 4 p.m.
ET. You may request this service on your initial account application.
Calvert Money Controller transactions returned for insufficient funds will
incur a $25 charge.

TELEPHONE TRANSACTIONS
You may purchase, redeem, or exchange shares, wire funds and use Calvert
Money Controller by telephone if you have pre-authorized service
instructions. You receive telephone privileges automatically when you open
your account unless you elect otherwise. For our mutual protection, the
Fund, the shareholder servicing agent and their affiliates use precautions
such as verifying shareholder identity and recording telephone calls to
confirm instructions given by phone. A confirmation statement is sent for
most transactions; please review this statement and verify the accuracy of
your transaction immediately.

EXCHANGES
Calvert Group offers a wide variety of investment options that includes
common stock funds, tax-exempt and corporate bond funds, and money market
funds (call your broker or Calvert representative for more information). We
make it easy for you to purchase shares in other Calvert funds if your
investment goals change. The exchange privilege offers flexibility by
allowing you to exchange shares on which you have already paid a sales
charge from one mutual fund to another at no additional charge.

Complete and sign an account application, taking care to register your new
account in the same name and taxpayer identification number as your existing
Calvert account(s). Exchange instructions may then be given by telephone if
telephone redemptions have been authorized and the shares are not in
certificate form.

Before you make an exchange, please note the following:
Each exchange represents the sale of shares of one Fund and the purchase of
shares of another. Therefore, you could realize a taxable gain or loss.

You may exchange shares acquired by reinvestment of dividends or
distributions into another Calvert Fund at no additional charge.

Shares may only be exchanged for shares of the same class of another Calvert
Fund.

No CDSC is imposed on exchanges of shares subject to a CDSC at the time of
the exchange. The applicable CDSC is imposed at the time the shares acquired
by the exchange are redeemed.

Shareholders (and those managing multiple accounts) who make two purchases
and two exchange redemptions of shares of the same Fund during any six-month
period will be given written notice and may be prohibited from placing
additional investments. This policy does not prohibit a shareholder from
redeeming shares of any Fund, and does not apply to trades solely between
money market funds.

Each Fund reserves the right to terminate or modify the exchange privilege
with 60 days' written notice.

COMBINED GENERAL MAILINGS (Householding)
Multiple accounts with the same social security number will receive one
mailing per household of information such as prospectuses and semi-annual
and annual reports. You may request further grouping of accounts to receive
fewer mailings. Separate statements will be generated for each separate
account and will be mailed in one envelope for each combination above.

Special Services and Charges
Each Fund pays for shareholder services but not for special services that
are required by a few shareholders, such as a request for a historical
transcript of an account. You may be required to pay a fee for these special
services.

If you are purchasing shares through a program of services offered by a
broker/dealer or financial institution, you should read the program
materials together with this Prospectus. Certain features may be modified in
these programs. Investors may be charged a fee if they effect transactions
in Fund shares through a broker or agent.

MINIMUM ACCOUNT BALANCE
Please maintain a balance in each of your accounts of at least $1,000 per
class. If the balance in any of your accounts falls below the minimum during
a month, your account may be closed and the proceeds mailed to the address
of record. You will receive notice that your account is below the minimum,
and will be closed or charged if the balance is not brought up to the
required minimum amount within 30 days.

DIVIDENDS, CAPITAL GAINS AND TAXES

The Fund pays dividends from its net investment income monthly. Net
investment income consists of interest income, net short-term capital gains,
if any, and dividends declared and paid on investments, less expenses.
Distributions of net short-term capital gains (treated as dividends for tax
purposes) and net long-term capital gains, if any, are normally paid once a
year; however, the Fund does not anticipate making any such distributions
unless available capital loss carryovers have been used or have expired.
Dividend and distribution payments will vary between classes; dividend
payments are anticipated to be generally higher for Class A shares.

Dividend payment options
Dividends and any distributions are automatically reinvested in the same
Fund at NAV (without sales charge), unless you elect to have amounts of $10
or more paid in cash (by check or by Calvert Money Controller). Dividends
and distributions from any Calvert Group Fund may be automatically invested
in an identically registered account in any other Calvert Group Fund at NAV.
If reinvested in the same account, new shares will be purchased at NAV on
the reinvestment date, which is generally 1 to 3 days prior to the payment
date. You must notify the Fund in writing to change your payment options. If
you elect to have dividends and/or distributions paid in cash, and the US
Postal Service returns the check as undeliverable, it, as well as future
dividends and distributions, will be reinvested in additional shares. No
dividends will accrue on amounts represented by uncashed distribution or
redemption checks.

Buying a Dividend
At the time of purchase, the share price of each class may reflect
undistributed income, capital gains or unrealized appreciation of
securities. Any income or capital gains from these amounts which are later
distributed to you are fully taxable. On the record date for a distribution,
share value is reduced by the amount of the distribution. If you buy shares
just before the record date ("buying a dividend") you will pay the full
price for the shares and then receive a portion of the price back as a
taxable distribution.

Federal Taxes
Dividends derived from interest on municipal obligations constitute
exempt-interest dividends, on which you are not subject to federal income
tax. However, dividends which are from taxable interest and any
distributions of short term capital gain are taxable to you as ordinary
income. If the Fund makes any distributions of long-term capital gains, then
these are taxable to you as long-term capital gains, regardless of how long
you held your shares of the Fund. Dividends attributable to interest on
certain private activity bonds must be included in federal alternative
minimum tax for individuals and for corporations. Each Fund may invest in
and derive income from taxable short-term money market investments, for
liquidity purposes or pending investment of the new assets (20% for National
and California, 35% for Maryland and Virginia). Interest earned from taxable
investments will be taxable as ordinary income.

If any taxable income or gains are paid, in January, your Fund will mail you
Form 1099-DIV indicating the federal tax status of dividends and any capital
gain distributions paid to you during the past year. Generally, dividends
and distributions are taxable in the year they are paid. However, any
dividends and distributions paid in January but declared during the prior
three months are taxable in the year declared. Dividends and distributions
are taxable to you regardless of whether they are taken in cash or
reinvested.

You may realize a capital gain or loss when you sell or exchange shares.
This capital gain or loss will be short- or long-term, depending on how long
you have owned the shares which were sold. In January, your Fund will mail
you Form 1099-B indicating the total amount of all sales, including
exchanges. You should keep your annual year-end account statements to
determine the cost (basis) of the shares to report on your tax returns.

Other Tax Information - State Funds
Dividends derived from interest on specific state or local obligations are
exempt from that state's personal income tax, as are dividends from
obligations issued by certain territories, such as Puerto Rico. Your State
Fund will advise you each January of the percent of dividends qualifying for
this exemption. You should consult your tax advisor with regard to how
certain dividends affect you.

Taxpayer Identification Number
If we do not have your correct Social Security or Taxpayer Identification
Number ("TIN") and a signed certified application or Form W-9, Federal law
requires us to withhold 31% of your reportable dividends, and possibly 31%
of certain redemptions. In addition, you may be subject to a fine by the
Internal Revenue Service. You will also be prohibited from opening another
account by exchange. If this TIN information is not received within 60 days
after your account is established, your account may be redeemed (closed) at
the current NAV on the date of redemption. Calvert Group reserves the right
to reject any new account or any purchase order for failure to supply a
certified TIN.

HOW TO SELL SHARES

Your shares will be redeemed at the next NAV calculated after your
redemption request is received and accepted (less any applicable CDSC). The
proceeds will normally be sent to you on the next business day, but if
making immediate payment could adversely affect the Fund, it may take up to
seven (7) days to make payment. Calvert Money Controller redemptions
generally will be credited to your bank account on the second business day
after your phone call. When the NYSE is closed (or when trading is
restricted) for any reason other than its customary weekend or holiday
closings, or under any emergency circumstances as determined by the
Securities and Exchange Commission, redemptions may be suspended or payment
dates postponed. Please note that there are some federal holidays, however,
such as Columbus Day and Veterans' Day, when the NYSE is open and the Fund
is open but redemptions cannot be made due to the closure of the banking
system.

The Fund has the right to redeem shares in assets other than cash for
redemption amounts exceeding, in any 90-day period, $250,000 or 1% of the
net asset value of the Fund, whichever is less.

Follow these suggestions to ensure timely processing of your redemption
request:

By Telephone
You may redeem shares from your account by telephone and have your money
mailed to your address of record or electronically transferred or wired to a
bank you have previously authorized. A charge of $5 may be imposed on wire
transfers of less than $1,000.

Written Requests
Calvert Group, P.O. Box 419544, Kansas City, MO 64141-6544
Your letter should include your account number and fund and the number of
shares or the dollar amount you are redeeming. Please provide a daytime
telephone number, if possible, for us to call if we have questions. If the
money is being sent to a new bank, person, or address other than the address
of record, your letter must be signature guaranteed.

Systematic Check Redemptions
If you maintain an account with a balance of $10,000 or more, you may have
up to two (2) redemption checks for a fixed amount sent to you on the 15th
of the month, simply by sending a letter with all information, including
your account number, and the dollar amount ($100 minimum). If you would like
a regular check mailed to another person or place, your letter must be
signature guaranteed. Unless they otherwise qualify for a waiver, Class B or
Class C shares redeemed by Systematic Check Redemption will be subject to
the Contingent Deferred Sales Charge.

Corporations and Associations
Your letter of instruction and corporate resolution should be signed by
person(s) authorized to act on the account, accompanied by signature
guarantee(s).

Trusts
Your letter of instruction should be signed by the Trustee(s) (as
Trustee(s)), with a signature guarantee. (If the Trustee's name is not
registered on your account, please provide a copy of the trust document,
certified within the last 60 days.)

Through your Dealer
Your dealer must receive your request before the close of regular trading on
the NYSE to receive that day's NAV. Your dealer will be responsible for
furnishing all necessary documentation to Calvert Group and may charge you
for services provided.

FINANCIAL HIGHLIGHTS

The financial highlights table is intended to help you understand the Funds'
financial performance for the past 5 years. Certain information reflects
financial results for a single share, by Fund and Class. The total returns
in the table represent the rate that an investor would have earned (or lost)
on an investment in a Fund (assuming reinvestment of all dividends and
distributions), and does not reflect any applicable front- or back-end sales
charge. This information has been audited by PricewaterhouseCoopers LLP,
whose report, along with a Fund's financial statements, are included in the
Fund's annual report, which is available upon request.

Financial Highlights
[insert financial highlights for the last five years here]

<PAGE>

EXHIBIT A
REDUCED SALES CHARGES (CLASS A ONLY)

You may qualify for a reduced sales charge through several purchase plans
available. You must notify the Fund at the time of purchase to take
advantage of the reduced sales charge.

Rights of Accumulation can be applied to several accounts
Class A sales charge breakpoints are automatically calculated for each
account based on the higher of cost or current value of shares previously
purchased. This privilege can be applied to a family group or other
qualified group* upon request. Shares could then be purchased at the reduced
sales charge which applies to the entire group; that is, based on the higher
of cost or current value of shares previously purchased and currently held
by all the members of the group.

* A "qualified group" is one which:
has been in existence for more than six months, and
has a purpose other than acquiring shares at a discount, and
satisfies uniform criteria which enable CDI and brokers offering shares to
realize economies of scale in distributing such shares.

A qualified group must have more than 10 members, must be available to
arrange for group meetings between representatives of CDI or brokers
distributing shares, must agree to include sales and other materials related
to the Funds in its publications and mailings to members at reduced or no
cost to CDI or brokers. A pension plan is not a qualified group for rights
of accumulation.

Letter of Intent
If you (or your group, as described above) plan to purchase $50,000 or more
of Calvert Fund shares over the next 13 months, your sales charge may be
reduced through a "Letter of Intent." You pay the lower sales charge
applicable to the total amount you plan to invest over the 13-month period,
excluding any money market portfolio purchases. Part of your shares will be
held in escrow, so that if you do not invest the amount indicated, you will
have to pay the sales charge applicable to the smaller investment actually
made. For more information, see the SAI.

Neither the Funds, nor Calvert Distributors, Inc. ("CDI"), nor any affiliate
thereof will reimburse a plan or participant for any sales charges paid
prior to receipt of such written communication and confirmation by Calvert
Group. Plan administrators should send requests for the waiver of sales
charges based on the above conditions to: Calvert Group Retirement Plans,
4550 Montgomery Avenue, Suite 1000N, Bethesda, Maryland 20814.

Other Circumstances
There is no sales charge on shares of any Fund of the Calvert Group of Funds
sold to (i) current or retired Directors, Trustees, or Officers of the
Calvert Group of Funds, employees of Calvert Group, Ltd. and its affiliates,
or their family members; (ii) CSIF Advisory Council Members, directors,
officers, and employees of any subadvisor for the Calvert Group of Funds,
employees of broker/dealers distributing the Fund's shares and immediate
family members of the Council, subadvisor, or broker/dealer; (iii) Purchases
made through a Registered Investment Advisor; (iv) Trust departments of
banks or savings institutions for trust clients of such bank or institution,
(v) Purchases through a broker maintaining an omnibus account with the Fund,
provided the purchases are made by (a) investment advisors or financial
planners placing trades for their own accounts (or the accounts of their
clients) and who charge a management, consulting, or other fee for their
services; or (b) clients of such investment advisors or financial planners
who place trades for their own accounts if such accounts are linked to the
master account of such investment advisor or financial planner on the books
and records of the broker or agent; or (c) retirement and deferred
compensation plans and trusts, including, but not limited to, those defined
in section 401(a) or section 403(b) of the I.R.C., and "rabbi trusts."

Dividends and Capital Gain Distributions from other Calvert Group Funds
You may prearrange to have your dividends and capital gain distributions
from another Calvert Group Fund automatically invested in another account
with no additional sales charge.

Purchases made at NAV
Except for money market funds, if you make a purchase at NAV, you may
exchange that amount to another Calvert Group Fund at no additional sales
charge.

Reinstatement Privilege
If you redeem shares and then within 30 days decide to reinvest in the same
Fund, you may do so at the net asset value next computed after the
reinvestment order is received, without a sales charge. You may use the
reinstatement privilege only once. The Funds reserve the right to modify or
eliminate this privilege.

EXHIBIT B
Service Fees and Arrangements with Dealers

Calvert Distributors, Inc., the Fund's underwriter, pays dealers a
commission, or reallowance (expressed as a percentage of the offering price
for Class A, and a percentage of amount invested for Class B and C) when you
purchase shares of non-money market portfolios. CDI also pays dealers an
ongoing service fee while you own shares of a Fund (expressed as an annual
percentage rate of average daily net assets held in Calvert accounts by that
dealer). The table below shows the amount of payment which differs depending
on the Class.

                      Maximum Commission/Service Fees

                      Class A           Class B           Class C*

National              2.25%/0.15%       2.25%/0.25%       1.00%/1.00%
California            2.25%/0.15%       2.25%/0.25%       1.00%/1.00%
Maryland              2.25%/0.15%       2.25%/0.25%       1.00%/1.00%
Virginia              2.25%/0.15%       2.25%/0.25%       1.00%/1.00%

*Class C pays dealers a service fee of 0.25% and additional compensation of
0.75% for a total of 1.00%.

Occasionally, CDI may reallow to dealers the full Class A front-end sales
charge. CDI may also pay additional concessions, including non-cash
promotional incentives, such as merchandise or trips, to brokers employing
registered representatives who have sold or are expected to sell a minimum
dollar amount of shares of the Funds and/or shares of other Funds
underwritten by CDI. CDI may make expense reimbursements for special
training of a broker's registered representatives, advertising or equipment,
or to defray the expenses of sales contests. CAMCO, CDI, or their affiliates
may pay certain broker-dealers and/or other persons, for the sale and
distribution of the securities or for services to the Fund. Payments may
include additional compensation based on assets held through that firm
beyond the regularly scheduled rates, and finder's fees. CDI pays dealers a
finder's fee on Class A shares purchased at NAV in accounts with $1 million
or more. The finder's fee is 1% of the NAV purchase amount on the first $2
million, .80% on $2 to $3 million, .50% on $3 to $50 million, .25% on $50 to
$100 million, and .15 over $1 million. All payments will be in compliance
with the rules of the National Association of Securities Dealers, Inc.

To Open an Account:
800-368-2748

Performance and Prices:
Calvert Information Network
24 hours, 7 days a week
800-368-2745

Service for Existing Accounts:
Shareholders 800-368-2745
Brokers 800-368-2746

TDD for Hearing-Impaired:
800-541-1524

Branch Office:
4550 Montgomery Avenue
Suite 1000N
Bethesda, Maryland 20814

Registered, Certified or
Overnight Mail:
Calvert Group
c/o NFDS
330 West 9th Street
Kansas City, MO 64105

Calvert Group Web-Site
Address: http://www.calvertgroup.com

PRINCIPAL UNDERWRITER
Calvert Distributors, Inc.
4550 Montgomery Avenue
Suite 1000N
Bethesda, Maryland 20814

<PAGE>

Outside Back Cover Page

The Statement of Additional Information ("SAI") (dated April 30, 1999) for
the Funds has been filed with the Securities and Exchange Commission and is
incorporated by reference. Additional information about the Funds'
investments is available in the Funds' annual and semi-annual reports to
shareholders. The SAI and the Funds' annual and semi-annual reports are
available, without charge and upon request, from the Fund at 800-368-2748.

Information about the Funds (including the SAI) can be reviewed at the
Commission's Public Reference Room in Washington, D.C. Information on the
operation of the public reference room may be obtained by calling the
Commission at 1-800-SEC-0330. Reports and other information about the Fund
are available on the Commission's internet site at http://www.sec.gov.
Copies of this information may be obtained, by payment of a duplicating fee,
by writing the Public Reference Section of the Commission, Washington, D.C.
20549-6009.

811-6525 Calvert Municipal Fund, Inc.

<PAGE>

STATEMENT OF ADDITIONAL INFORMATION - April 30, 1999

                         Calvert Municipal Fund, Inc.
                 Calvert National Municipal Intermediate Fund
                Calvert California Municipal Intermediate Fund
                 Calvert Maryland Municipal Intermediate Fund
                 Calvert Virginia Municipal Intermediate Fund
               4550 Montgomery Avenue, Bethesda, Maryland 20814

New Account Information
         (800) 368-2748
         (301) 951-4820

Shareholder Services
         (800) 368-2745

Broker Services
         (800) 368-2746
         (301) 951-4850

TDD for the Hearing- Impaired
         (800) 541-1524

         This  Statement  of  Additional  Information  is  not  a  prospectus.
Investors  should read the Statement of Additional  Information in conjunction
with the Prospectus of Calvert  Municipal  Fund (the "Fund"),  dated April 30,
1999, which may be obtained free of charge by writing or calling the Fund.

         The audited  financial  statements  included in the Annual  Report to
Shareholders   dated  December  31,  1998,  are  expressly   incorporated   by
reference  and  made a part  of  this  Statement  of  Additional  Information.
Copies of this  Report  may be  obtained  free of charge by writing or calling
the Fund.

     TABLE OF CONTENTS

     Investment Policies and Risks                           1
     Investment Restrictions                                 6
     Purchases and Redemptions of Shares                     7
     Dividends and Distributions                             8
     Tax Matters                                             8
     Valuation of Shares                                     9
     Calculation of Yield and Total Return                  10
     Advertising                                            11
     Directors and Officers                                 11
     Investment Advisor                                     14
     Administrative Services                                15
     Method of Distribution                                 15
     Transfer and Shareholder Servicing Agent               16
     Independent Accountants and Custodians                 16
     Portfolio Transactions                                 16
     General Information                                    16
     Financial Statements                                   17
     Control Persons and Principal Holders of Securities    17
     Appendix                                               17

<PAGE>

- ------------------------------------------------------------------------------
                        INVESTMENT POLICIES AND RISKS
- ------------------------------------------------------------------------------

         Calvert National  Municipal  Intermediate Fund  ("National")  invests
primarily in a nondiversified  portfolio of municipal  obligations,  including
some with  interest  that may be  subject  to  alternative  minimum  tax.  The
average  dollar-weighted  maturity of  investments  is between 3 and 10 years.
Fixed rate  investments  normally  have  remaining  maturities  of 12 years or
less;  variable  rate  investments  may have  longer  maturities.  A  complete
explanation  of  municipal  obligations  and  municipal  bond and note ratings
appears in the Appendix.
         Calvert  California   Municipal   Intermediate  Fund   ("California")
invests  primarily in a  nondiversified  portfolio  of municipal  obligations,
including some with interest that may be subject to  alternative  minimum tax.
Fixed rate  investments  normally  have  remaining  maturities  of 12 years or
less;  variable  rate  investments  may have  longer  maturities.  A  complete
explanation  of  municipal  obligations  and  municipal  bond and note ratings
appears in the Appendix.
         Calvert   Maryland  and   Virginia   Municipal   Intermediate   Funds
("Maryland"   and/or   "Virginia")   invest   primarily  in  a  nondiversified
portfolio of municipal  obligations,  including some with interest that may be
subject  to  alternative  minimum  tax. A complete  explanation  of  municipal
obligations and municipal bond and note ratings appears in the Appendix.
         Under normal market  conditions,  each Fund will attempt to invest at
least 65% of its total assets in municipal  obligations  with interest that is
exempt from federal and, for  California,  Maryland,  and  Virginia,  specific
state  income  tax,  including  those  issued by or on behalf of the state for
which the Fund is named and the state's  political  subdivisions.  California,
Maryland,  and  Virginia  will also  attempt  to invest the  remaining  35% of
total  assets  in  these  obligations,  but may  invest  assets  in  municipal
obligations  of  other  states,  territories  and  possessions  of the  United
States,   the  District  of  Columbia,   and  their  respective   authorities,
agencies,   instrumentalities  and  political   subdivisions.   Dividends  you
receive  from  the  Fund  that  are  derived  from   interest  on   tax-exempt
obligations  of other states will be exempt from federal  income tax, but will
be subject to your  state's  income  taxes.  For  National,  to the extent the
obligations  are  issued by your  state of  residence,  you may also be exempt
from certain state and local income taxes.

Variable Rate Demand Notes
         The  Board  of  Directors  of the Fund has  approved  investments  in
floating  and  variable  rate  demand  notes  upon the  following  conditions:
National,  California,  Maryland,  and  Virginia  ("each  Portfolio"  or  "the
Portfolios")  each have the right of demand,  upon notice not to exceed thirty
days,  against the issuer to receive payment;  the issuer will be able to make
payment  upon  such  demand,  either  from its own  resources  or  through  an
unqualified  commitment from a third party;  and the rate of interest  payable
is calculated  to ensure that the market value of such notes will  approximate
par value on the  adjustment  dates.  The  remaining  maturity  of such demand
notes is deemed the period  remaining  until such time as the Portfolios  have
the  right to  dispose  of the  notes at a price  which  approximates  par and
market  value.  Notes  with  a  right  of  demand  exceeding  seven  days  are
considered illiquid and are subject to purchase restrictions.

Municipal Leases
         Each  Portfolio  may  invest  in  municipal   leases,  or  structured
instruments  where the underlying  security is a municipal  lease. A municipal
lease  is  an  obligation  of a  government  or  governmental  authority,  not
subject to voter  approval,  used to finance  capital  projects  or  equipment
acquisitions  and payable  through  periodic rental  payments.  Each Portfolio
may purchase  unrated  leases.  The Fund's  Advisor,  under the supervision of
the Board of  Trustees/Directors,  is responsible  for  determining the credit
quality of such leases on an ongoing  basis,  including an  assessment  of the
likelihood that the lease will not be canceled.  Certain  municipal leases may
be  considered  illiquid  and  subject to each  Portfolio's  limit on illiquid
securities.  The Board of  Trustees/Directors  has  directed  the  Advisor  to
treat a municipal  lease as a liquid  security if it satisfies  the  following
conditions:  (A) such  treatment  must be  consistent  with  each  Portfolio's
investment  restrictions;  (B) the Advisor should be able to conclude that the
obligation  will  maintain its liquidity  throughout  the time it is held by a
Portfolio,  based on the  following  factors:  (1)  whether  the  lease may be
terminated by the lessee; (2) the potential  recovery,  if any, from a sale of
the leased property upon  termination of the lease;  (3) the lessee's  general
credit  strength  (e.g.,  its debt,  administrative,  economic  and  financial
characteristics  and  prospects);  (4) the  likelihood  that the  lessee  will
discontinue   appropriating  funding  for  the  leased  property  because  the
property  is  no  longer  deemed  essential  to  its  operations   (e.g.,  the
potential   for  an  "event  of   nonappropriation"),   and  (5)  any   credit
enhancement or legal recourse  provided upon an event of  nonappropriation  or
other  termination of the lease; (C) the Advisor should determine  whether the
obligation  can be disposed  of within  seven days in the  ordinary  course of
business at  approximately  the amount at which a Portfolio  has valued it for
purposes of  calculating  net asset value,  taking into account the  following
factors:  (1) the  frequency  of trades  and  quotes;  (2) the  volatility  of
quotations  and trade  prices;  (3) the number of dealers  willing to purchase
or sell the  security  and the  number of  potential  purchasers;  (4)  dealer
undertakings  to  make a  market  in  the  security;  (5)  the  nature  of the
security and the nature of the  marketplace  trades (e.g.,  the time needed to
dispose of the security,  the method of soliciting  offers,  and the mechanics
of the transfer);  (6) the rating of the security and the financial  condition
and  prospects  of  the  issuer;   and  (7)  other  factors  relevant  to  the
Portfolio's  ability to dispose of the  security;  and (D) the Advisor  should
have  reasonable   expectations  that  the  municipal  lease  obligation  will
maintain  its  liquidity  throughout  the  time  the  instrument  is held by a
Portfolio.

Temporary Investments
         Short-term money market type investments  consist of:  obligations of
the U.S.  Government,  its agencies  and  instrumentalities;  certificates  of
deposit  of banks  with  assets of one  billion  dollars  or more;  commercial
paper or other corporate notes of  investment-grade  quality;  and any of such
items subject to short-term repurchase agreements.

When-Issued Purchases
         New issues of  municipal  obligations  are  offered on a  when-issued
basis;  that is,  delivery and payment for the securities  normally take place
15 to 45 days after the date of the  transaction.  The payment  obligation and
the yield that will be received on the  securities  are each fixed at the time
the  buyer  enters  into  the  commitment.   The  Portfolios  will  only  make
commitments  to  purchase  these  securities  with the  intention  of actually
acquiring  them, but may sell these  securities  before the settlement date if
it is deemed advisable as a matter of investment strategy.
         Securities  purchased on a when-issued  basis and the securities held
in a  Portfolio  are  subject  to  changes  in  market  value  based  upon the
public's  perception of the  creditworthiness of the issuer and changes in the
level of interest  rates  (which  will  generally  result in both  changing in
value in the same way,  i.e.,  both  experiencing  appreciation  when interest
rates decline and  depreciation  when interest rates rise).  Therefore,  if in
order to achieve higher interest  income,  a Portfolio  remains  substantially
fully  invested  at the  same  time  that  it has  purchased  securities  on a
when-issued basis,  there will be a greater  possibility that the market value
of the Portfolio's assets may vary.
         When the time comes to pay for  when-issued  securities,  a Portfolio
will meet its  obligations  from then available cash flow,  sale of securities
or,  although  it  would  not  normally  expect  to do so,  from  sale  of the
when-issued  securities  themselves  (which may have a market value greater or
less than the  Portfolio's  payment  obligation).  Sale of  securities to meet
such  obligations  carries with it a greater  potential for the realization of
capital  losses and capital  gains which are not exempt  from  federal  income
tax.  When-issued  securities  do not earn income until they have in fact been
issued.
         When a Portfolio purchases a when-issued  security,  it will maintain
an amount of cash, cash equivalents  (for example,  commercial paper and daily
tender adjustable  notes) or short-term  high-grade fixed income securities in
a segregated  account with the  Portfolio's  custodian,  so that the amount so
segregated  plus the  amount  of  initial  and  variation  margin  held in the
account of its broker  equals the market  value of the  when-issued  purchase,
thereby ensuring the transaction is unleveraged.

Transactions in Futures Contracts
         Each  Portfolio  may  engage  in the  purchase  and  sale of  futures
contracts on an index of municipal bonds or on U.S.  Treasury  securities,  or
options on such  futures  contracts,  for  hedging and  substitution  purposes
only.  Each  Portfolio may sell such futures  contracts in  anticipation  of a
decline in the cost of municipal  bonds it holds or may purchase  such futures
contracts in  anticipation  of an increase in the value of municipal bonds the
Portfolio  intends to acquire.  Each  Portfolio also is authorized to purchase
and  sell  other  financial  futures  contracts  which in the  opinion  of the
Investment  Advisor  provide  an  appropriate  hedge  for  some  or all of its
securities.
         Because of low  initial  margin  deposits  made upon the opening of a
futures position,  futures  transactions  involve substantial  leverage.  As a
result,  relatively  small movements in the price of the futures  contract can
result in  substantial  unrealized  gains or losses.  Because  each  Portfolio
will engage in the  purchase and sale of financial  futures  contracts  solely
for  hedging  and  substitution  purposes,  however,  any losses  incurred  in
connection  therewith  should,  if the  strategy is  successful,  be offset in
whole or in part by increases in the value of  securities  held by a Portfolio
or decreases in the price of securities a Portfolio intends to acquire.
         Municipal  bond index  futures  contracts  commenced  trading in June
1985,  and it is possible that trading in such futures  contracts will be less
liquid  than  that  in  other  futures  contracts.   The  trading  of  futures
contracts  and options  thereon is subject to certain  market  risks,  such as
trading halts,  suspensions,  exchange or clearing house  equipment  failures,
government  intervention  or other  disruptions  of normal  trading  activity,
which could at times make it difficult  or  impossible  to liquidate  existing
positions.
         The  liquidity  of a  secondary  market in futures  contracts  may be
further  adversely  affected by "daily price fluctuation  limits"  established
by contract  markets,  which limit the amount of fluctuation in the price of a
futures  contract or option  thereon  during a single  trading  day.  Once the
daily limit has been  reached in the  contract,  no trades may be entered into
at a  price  beyond  the  limit,  thus  preventing  the  liquidation  of  open
positions.  Prices  of  existing  contracts  have in the past  moved the daily
limit on a number of  consecutive  trading  days.  Each  Portfolio  will enter
into a futures  position only if, in the judgment of the  Investment  Advisor,
there  appears to be an  actively  traded  secondary  market for such  futures
contracts.
         The successful use of transactions  in futures  contracts and options
thereon  depends  on  the  ability  of the  Investment  Advisor  to  correctly
forecast the  direction  and extent of price  movements of these  instruments,
as well as price movements of the securities  held by each Portfolio  within a
given time frame.  To the extent these prices  remain stable during the period
in which a futures or option  contract  is held by a  Portfolio,  or move in a
direction  opposite to that  anticipated,  a  Portfolio  may realize a loss on
the  hedging  transaction  which  is  not  fully  or  partially  offset  by an
increase in the value of its  securities.  As a result,  a  Portfolio's  total
return for such  period may be less than if it had not  engaged in the hedging
transaction.

Description of Financial Futures Contracts
         Futures  Contracts.  A futures  contract  obligates  the  seller of a
contract to deliver and the  purchaser  of a contract to take  delivery of the
type  of  financial  instrument  called  for  in  the  contract  or,  in  some
instances,  to  make a cash  settlement,  at a  specified  future  time  for a
specified  price.  Although the terms of a contract  call for actual  delivery
or  acceptance  of  securities,  or for a cash  settlement,  in most cases the
contracts  are closed out before the  delivery  date  without the  delivery or
acceptance  taking  place.  Each  Portfolio  intends to close out any  futures
contracts prior to the delivery date of such contracts.
         Each  Portfolio  may sell  futures  contracts  in  anticipation  of a
decline  in  the  value  of its  investments  in  municipal  bonds.  The  loss
associated  with any such decline could be reduced without  employing  futures
as a  hedge  by  selling  long-term  securities  and  either  reinvesting  the
proceeds in securities  with shorter  maturities or by holding assets in cash.
This strategy,  however,  entails  increased  transaction costs in the form of
brokerage  commissions  and dealer  spreads  and will  typically  reduce  each
Portfolio's average yields as a result of the shortening of maturities.
         The  purchase  or  sale  of  a  futures  contract  differs  from  the
purchase  or  sale of a  security,  in that no  price  or  premium  is paid or
received.  Instead,  an  amount  of  cash  or  securities  acceptable  to each
Portfolio's  futures  commission  merchant and the relevant  contract  market,
which varies but is generally  about 5% or less of the contract  amount,  must
be deposited  with the broker.  This amount is known as "initial  margin," and
represents  a "good  faith"  deposit  assuring  the  performance  of both  the
purchaser and the seller under the futures  contract.  Subsequent  payments to
and from the broker,  known as "variation  margin," are required to be made on
a daily  basis as the price of the  futures  contract  fluctuates,  making the
long or short  positions  in the futures  contract  more or less  valuable,  a
process  known as "marking to the  market."  Prior to the  settlement  date of
the futures  contract,  the  position  may be closed out by taking an opposite
position  which  will  operate  to  terminate  the  position  in  the  futures
contract.  A final determination of variation margin is then made,  additional
cash is required to be paid to or  released by the broker,  and the  purchaser
realizes a loss or gain. In addition,  a commission is paid on each  completed
purchase and sale transaction.
         The sale of  financial  futures  contracts  provides  an  alternative
means  of  hedging  a  Portfolio   against   declines  in  the  value  of  its
investments  in  municipal  bonds.  As such  values  decline,  the  value of a
Portfolio's  position in the futures  contracts  will tend to  increase,  thus
offsetting  all or a portion of the  depreciation  in the market  value of the
Portfolio's  fixed  income  investments  which  are  being  hedged.   While  a
Portfolio  will incur  commission  expenses  in  establishing  and closing out
futures  positions,  commissions on futures  transactions may be significantly
lower  than  transaction  costs  incurred  in the  purchase  and sale of fixed
income  securities.  In  addition,  the ability of a Portfolio to trade in the
standardized  contracts  available  in the  futures  market  may  offer a more
effective  hedging  strategy than a program to reduce the average  maturing of
portfolio  securities,  due to the  unique and  varied  credit  and  technical
characteristics   of  the  municipal   debt   instruments   available  to  the
Portfolio.  Employing  futures as a hedge may also  permit each  Portfolio  to
assume a  hedging  posture  without  reducing  the  yield on its  investments,
beyond any amounts required to engage in futures trading.
         Each  Portfolio  may  engage  in the  purchase  and  sale of  futures
contracts on an index of municipal  securities.  These instruments provide for
the  purchase or sale of a  hypothetical  portfolio  of  municipal  bonds at a
fixed price in a stated delivery month.  Unlike most other futures  contracts,
however,  a municipal  bond index  futures  contract  does not require  actual
delivery  of  securities  but  results  in a cash  settlement  based  upon the
difference  in value of the index  between the time the  contract  was entered
into and the time it is liquidated.
         The municipal bond index  underlying the futures  contracts traded by
each Portfolio is The Bond Buyer  Municipal Bond Index,  developed by The Bond
Buyer and the Chicago  Board of Trade  ("CBT"),  the contract  market on which
the  futures  contracts  are traded.  As  currently  structured,  the index is
comprised  of 40  tax-exempt  term  municipal  revenue and general  obligation
bonds.  Each bond  included in the index must be rated  either A- or higher by
Standard & Poor's or A or higher by Moody's  Investors  Service  and must have
a  remaining  maturity  of  19  years  or  more.  Twice  a  month  new  issues
satisfying the eligibility  requirements  are added to, and an equal number of
old  issues  will be  deleted  from,  the  index.  The  value of the  index is
computed  daily  according  to a formula  based upon the price of each bond in
the index, as evaluated by four dealer-to-dealers brokers.
         Each  Portfolio may also purchase and sell futures  contracts on U.S.
Treasury   bills,   notes  and  bonds  for  the  same  types  of  hedging  and
substitution  purposes.  Such  futures  contracts  provide for delivery of the
underlying  security at a specified  future  time for a fixed  price,  and the
value of the futures contract  therefore  generally  fluctuates with movements
in interest rates.
         The  municipal  bond index  futures  contract,  futures  contracts on
U.S.  Treasury  securities and options on such futures contracts are traded on
the CBT, which,  like other contract  markets,  assures the performance of the
parties to each futures contract through a clearing  corporation,  a nonprofit
organization  managed by the exchange  membership,  which is also  responsible
for handling daily accounting of deposits or withdrawals of margin.
         Each  Portfolio may also purchase  financial  futures  contracts when
not fully invested in municipal  bonds,  in anticipation of an increase in the
cost of securities a Portfolio  intends to purchase.  As such  securities  are
purchased,  an equivalent  amount of futures  contracts will be closed out. In
a  substantial  majority  of these  transactions,  a Portfolio  will  purchase
municipal  bonds upon  termination of the futures  contracts.  Due to changing
market  conditions and interest rate forecasts,  however,  a futures  position
may  be   terminated   without  a   corresponding   purchase  of   securities.
Nevertheless,  all  purchases  of futures  contracts  by a  Portfolio  will be
subject to certain restrictions, described below.
         Options  on  Futures  Contracts.  An  option  on a  futures  contract
provides the purchaser with the right,  but not the obligation,  to enter into
a long position in the  underlying  futures  contract  (that is,  purchase the
futures  contract),  in the case of a "call" option, or a short position (sell
the futures  contract),  in the case of a "put"  option,  for a fixed price up
to a stated  expiration  date.  The option is purchased  for a  non-refundable
fee,  known as the  "premium."  Upon  exercise  of the  option,  the  contract
market  clearing  house assigns each party to the option an opposite  position
in the underlying futures contract. In the event of exercise,  therefore,  the
parties  are subject to all of the risks of futures  trading,  such as payment
of initial and  variation  margin.  In addition,  the seller,  or "writer," of
the option is subject to margin  requirements on the option position.  Options
on  futures  contracts  are  traded  on  the  same  contract  markets  as  the
underlying futures contracts.
         Each  Portfolio  may purchase  options on futures  contracts  for the
same types of purposes  described above in connection with futures  contracts.
For example,  in order to protect against an anticipated  decline in the value
of  securities  it holds,  a Portfolio  could  purchase put options on futures
contracts,  instead of selling the underlying futures  contracts.  Conversely,
in order to protect  against the adverse  effects of anticipated  increases in
the costs of  securities  to be  acquired,  a Portfolio  could  purchase  call
options on futures  contracts,  instead of purchasing the  underlying  futures
contracts.  Each Portfolio  generally  will sell options on futures  contracts
only to close out an existing position.
         Each Portfolio will not engage in  transactions  in such  instruments
unless and until the  Investment  Advisor  determines  that market  conditions
and the  circumstances  of the Portfolio  warrant such trading.  To the extent
that a Portfolio  engages in the  purchase  and sale of futures  contracts  or
options  thereon,  it will do so only at a level  which is  reflective  of the
Investment  Advisor's view of the Portfolio's  hedging needs, the liquidity of
the market for  futures  contracts  and the  anticipated  correlation  between
movements  in the value of the  futures  or option  contract  and the value of
securities held by the Portfolio.
         Restrictions  on the Use of Futures  Contracts and Options on Futures
Contracts.  Under  regulations  of the Commodity  Futures  Trading  Commission
("CFTC"),  the futures trading activities  described herein will not result in
a  Portfolio  being  deemed to be a  "commodity  pool," as defined  under such
regulations,  provided that certain  trading  restrictions  are adhered to. In
particular,  CFTC  regulations  require that all futures and option  positions
entered  into by a  Portfolio  qualify  as bona fide  hedge  transactions,  as
defined under CFTC  regulations,  or, in the case of long positions,  that the
value of such  positions not exceed an amount of segregated  funds  determined
by  reference  to  certain  cash  and  securities  positions  maintained  by a
Portfolio and accrued profits on such positions.  In addition,  as a matter of
operating  policy,  a Portfolio may not purchase or sell a futures contract or
an  option  thereon  if,  immediately  thereafter,  the sum of the  amount  of
initial margin  deposits on the  Portfolio's  existing  futures  positions and
premiums on such options would exceed 5% of its net assets.
         When a Portfolio  purchases a futures  contract,  it will maintain an
amount of cash,  cash  equivalents  (for example,  commercial  paper and daily
tender adjustable  notes) or short-term  high-grade fixed income securities in
a segregated  account with the  Portfolio's  custodian,  so that the amount so
segregated  plus the  amount  of  initial  and  variation  margin  held in the
account  of its  broker  equals  the  market  value of the  futures  contract,
thereby ensuring that the use of such futures is unleveraged.
         Risk Factors in  Transactions  in Futures  Contracts.  The particular
municipal  bonds  comprising  the index  underlying  the municipal  bond index
futures  contract may vary from the bonds held by the Portfolio.  In addition,
the securities  underlying futures contracts on U.S. Treasury  securities will
not be the  same as  securities  held by the  Portfolios.  As a  result,  each
Portfolio's  ability  effectively  to hedge all or a  portion  of the value of
its municipal  bonds through the use of futures  contracts will depend in part
on the degree to which price  movements in the index  underlying the municipal
bond  index  futures  contract,  or the U.S.  Treasury  securities  underlying
other  futures  contracts  trade,   correlate  with  price  movements  of  the
municipal bonds held by the Portfolio.
         For example,  where prices of  securities  in a Portfolio do not move
in the same  direction  or to the same extent as the values of the  securities
or  index  underlying  a  futures  contract,   the  trading  of  such  futures
contracts  may not  effectively  hedge  the  Portfolio's  investments  and may
result in trading  losses.  The  correlation may be affected by disparities in
the  average  maturity,   ratings,   geographical  mix  or  structure  of  the
Portfolio's  investments  as  compared  to those  comprising  the  index,  and
general economic or political factors.  In addition,  the correlation  between
movements  in the value of the index  underlying  a  futures  contract  may be
subject to change over time,  as  additions  to and  deletions  from the index
alter  its  structure.  In the  case of  futures  contracts  on U.S.  Treasury
securities  and  options  thereon,   the  anticipated   correlation  of  price
movements  between  the U.S.  Treasury  securities  underlying  the futures or
options  and   municipal   bonds  may  be  adversely   affected  by  economic,
political,  legislative or other  developments that have a disparate impact on
the respective  markets for such securities.  In the event that the Investment
Advisor  determines to enter into  transactions in financial futures contracts
other  than the  municipal  bond  index  futures  contract  or futures on U.S.
Treasury  securities,  the risk of imperfect  correlation between movements in
the prices of such futures  contracts  and the prices of municipal  bonds held
by a Portfolio may be greater.
         The trading of futures  contracts  on an index also  entails the risk
of  imperfect  correlation  between  movements  in the  price  of the  futures
contract  and the  value  of the  underlying  index.  The  anticipated  spread
between the prices may be distorted  due to  differences  in the nature of the
markets,  such as margin  requirements,  liquidity  and the  participation  of
speculators  in the  futures  markets.  The  risk  of  imperfect  correlation,
however,  generally  diminishes as the delivery month specified in the futures
contract approaches.
         Prior to exercise or expiration,  a position in futures  contracts or
options  thereon may be terminated  only by entering  into a closing  purchase
or  sale  transaction.  This  requires  a  secondary  market  on the  relevant
contract  market.  Each Portfolio will enter into a futures or option position
only if there  appears  to be a liquid  secondary  market  therefor,  although
there can be no assurance that such a liquid  secondary  market will exist for
any  particular  contract at any specific  time.  Thus, it may not be possible
to  close  out  a  position   once  it  has  been   established.   Under  such
circumstances,  a Portfolio  could be required to make  continuing  daily cash
payments  of  variation  margin in the event of adverse  price  movements.  In
such situation,  if a Portfolio has  insufficient  cash, it may be required to
sell portfolio  securities to meet daily  variation  margin  requirements at a
time when it may be  disadvantageous  to do so. In addition,  a Portfolio  may
be required to perform  under the terms of the futures or option  contracts it
holds.  The  inability  to close out futures or options  positions  also could
have an  adverse  impact on a  Portfolio's  ability  effectively  to hedge its
portfolio.
         When a  Portfolio  purchases  an option on a  futures  contract,  its
risk is  limited  to the  amount  of the  premium,  plus  related  transaction
costs,  although  this entire  amount may be lost.  In  addition,  in order to
profit from the purchase of an option on a futures  contract,  a Portfolio may
be  required to  exercise  the option and  liquidate  the  underlying  futures
contract,  subject  to the  availability  of a liquid  secondary  market.  The
trading of options on futures  contracts  also  entails the risk that  changes
in the value of the underlying  futures  contract will not be fully  reflected
in the  value  of the  option,  although  the  risk of  imperfect  correlation
generally  tends to diminish as the maturity  date of the futures  contract or
expiration date of the option approaches.
         "Trading  Limits"  or  "Position  Limits"  may also be imposed on the
maximum  number of  contracts  which any  person may hold at a given  time.  A
contract  market  may  order  the  liquidation  of  positions  found  to be in
violation of these limits and it may impose other  sanctions or  restrictions.
The  Investment  Advisor does not believe  that  trading  limits will have any
adverse impact on the strategies for hedging a Portfolio's investments.
         Further,  the trading of futures  contracts is subject to the risk of
the insolvency of a brokerage firm or clearing  corporation,  which could make
it  difficult or  impossible  to  liquidate  existing  positions or to recover
excess variation margin payments.
         In  addition  to the  risks of  imperfect  correlation  and lack of a
liquid  secondary  market  for  such  instruments,   transactions  in  futures
contracts   involve  risks  related  to  leveraging   and  the  potential  for
incorrect  forecasts of the direction  and extent of interest  rate  movements
within a given time frame.

Credit Quality
         As an operating  policy,  each Portfolio may not invest more than 35%
of its net assets in non-investment grade municipal  obligations.  As has been
the industry  practice,  this  determination  of credit quality is made at the
time a Portfolio  acquires  the  obligation.  However,  because it is possible
that subsequent  downgrades  could occur, if an obligation held by a Portfolio
is later  downgraded,  the Advisor,  under the supervision of the Fund's Board
of  Directors,  will  consider  whether  it is in  the  best  interest  of the
shareholders  to hold or to  dispose  of the  obligation.  Among the  criteria
that may be considered by the Advisor and the Board are the  probability  that
the  obligations  will  be  able  to make  scheduled  interest  and  principal
payments  in  the  future,   the  extent  to  which  any  devaluation  of  the
obligation has already been  reflected in the Portfolio' net asset value,  and
the  total   percentage,   if  any,  of  obligations   currently  rated  below
investment-grade held by a Portfolio.
         Noninvestment-grade  securities  have moderate to poor  protection of
principal and interest  payments and have  speculative  characteristics.  They
involve  greater  risk of  default  or price  declines  due to  changes in the
issuer's  creditworthiness than investment-grade debt securities.  Because the
market for  lower-rated  securities  may be thinner  and less  active than for
higher-rated  securities,  there  may be  market  price  volatility  for these
securities  and limited  liquidity  in the resale  market.  Market  prices for
these  securities  may decline  significantly  in periods of general  economic
difficulty or rising interest rates.

- ------------------------------------------------------------------------------
                           INVESTMENT RESTRICTIONS
- ------------------------------------------------------------------------------

Fundamental Investment Restrictions
         The  Portfolios  have adopted the  following  fundamental  investment
restrictions.  These  restrictions  cannot be changed  without the approval of
the holders of a majority of the outstanding shares of each Portfolio.

         (1) Each Portfolio may not make any investment
         inconsistent with its classification as a nondiversified
         investment company under the 1940 Act.
         (2) Each Portfolio may not concentrate its investments in
         the securities of issuers primarily engaged in any
         particular industry (other than securities issued or
         guaranteed by the U.S. Government or its agencies or
         instrumentalities and repurchase agreements secured
         thereby).
         (3) Each Portfolio may not issue senior securities or
         borrow money, except from banks for temporary or emergency
         purposes and then only in an amount up to 33 1/3% of the
         value of its total assets or as permitted by law and
         except by engaging in reverse repurchase agreements, where
         allowed. In order to secure any permitted borrowings and
         reverse repurchase agreements under this section, a
         Portfolio may pledge, mortgage or hypothecate its assets.
         (4) The Portfolios may not underwrite the securities of
         other issuers, except as allowed by law or to the extent
         that the purchase of obligations in accordance with a
         Portfolio's investment objective and policies, either
         directly from the issuer, or from an underwriter for an
         issuer, may be deemed an underwriting.
         (5) Each Portfolio may not invest directly in commodities
         or real estate, although it may invest in securities which
         are secured by real estate or real estate mortgages and
         securities of issuers which invest or deal in commodities,
         commodity futures, real estate or real estate mortgages.
         (6) The Portfolios may not make loans, other than through
         the purchase of money market instruments and repurchase
         agreements or by the purchase of bonds, debentures or
         other debt securities, or as permitted by law. The
         purchase of all or a portion of an issue of publicly or
         privately distributed debt obligations in accordance with
         a Portfolio's investment objective, policies and
         restrictions, shall not constitute the making of a loan.

Nonfundamental Investment Restrictions
         The  Board  of   Trustees/Directors   has   adopted   the   following
nonfundamental   investment   restrictions.    A   nonfundamental   investment
restriction  can be  changed  by the Board at any time  without a  shareholder
vote.

         (1)   Each Portfolio may not purchase common stocks,
              preferred stocks, warrants, or other equity securities.
         (2)   Each Portfolio does not intend to make any purchases
              of securities if borrowing exceeds 5% of a portfolio's
              total assets.
         (3)   Each  Portfolio may not purchase  illiquid  securities
              if more  than 15% of the value of net  assets  would be
              invested in such securities;
         (4)   Each   Portfolio  may  not  sell   securities   short,
              purchase  securities  on margin,  or write put and call
              options,   except  to  the   extent   permitted   under
              "Transactions  in Futures  Contracts"  or  elsewhere in
              the  Prospectus  or SAI.  The  Portfolios  reserve  the
              right to purchase securities with puts attached.
         (5)   National and California  each may not purchase or sell
              a futures  contract or an option thereon if immediately
              thereafter,  the sum of the  amount of  initial  margin
              deposits on futures and premiums on such options  would
              exceed 5% of the Portfolio's net assets;
         (6)   National and California each may not invest in puts
              or calls on a security, including straddles, spreads,
              or any combination, if the value of that option
              premium, when aggregated with the premiums on all
              other options on securities held by the Portfolio,
              exceeds 5% of the Portfolio's total assets.

- ------------------------------------------------------------------------------
                     PURCHASES AND REDEMPTIONS OF SHARES
- ------------------------------------------------------------------------------

         Share  certificates  will be  issued at no  charge  if  requested  in
writing  by the  investor.  No  certificates  will be  issued  for  fractional
shares (see Prospectus, "How to Sell Your Shares").
         To change redemption  instructions  already given,  shareholders must
send a written  notice to Calvert Group,  c/o NFDS,  330 W. 9th,  Kansas City,
MO 64105,  with a voided copy of a check for the bank wiring  instructions  to
be added.  If a voided check does not accompany the request,  then the request
must  be  signature   guaranteed  by  a  commercial  bank,  savings  and  loan
association,  trust company,  member firm of any national securities exchange,
or  certain  credit  unions.   Further  documentation  may  be  required  from
corporations, fiduciaries, and institutional investors.
         The  right of  redemption  may be  suspended  or the date of  payment
postponed  for any period  during which the New York Stock  Exchange is closed
(other than customary weekend and holiday  closings),  when trading on the New
York Stock Exchange is restricted,  or an emergency  exists,  as determined by
the  SEC,  or if  the  Commission  has  ordered  such  a  suspension  for  the
protection of shareholders.  Redemption  proceeds are normally mailed or wired
the next  business day after a proper  redemption  request has been  received,
unless redemptions have been suspended or postponed as described above.
         Certain  Class B  shares  may be  subject  to a  contingent  deferred
sales  charge  which  is  subtracted   from  the   redemption   proceeds  (see
Prospectus,  "Calculation  of Contingent  Deferred Sales Charges and Waiver of
Sales Charges").
         Redemption  proceeds  are  normally  paid  in  cash.  However,   each
Portfolio  has the  right to  redeem  shares  in  assets  other  than cash for
redemption  amounts  exceeding,  in any 90-day  period,  $250,000 or 1% of the
net asset value of a Portfolio, whichever is less.

Reduced Sales Charges
         Each Portfolio  imposes  reduced sales charges in certain  situations
in which  the  Principal  Underwriter  (which  offers  the  Portfolio'  shares
continuously  and on a "best  efforts"  basis) and the  dealers  selling  each
Portfolio's shares may expect to realize  significant  economies of scale with
respect to such sales.  Generally,  sales costs do not increase in  proportion
to  the  dollar  amount  of the  shares  sold;  for  example,  the  per-dollar
transaction  cost  for a  sale  to an  investor  of  shares  worth  $5,000  is
generally  much higher  than the  per-dollar  cost for a sale of shares  worth
$1,000,000.  Thus,  the  applicable  sales charge  declines as a percentage of
the dollar amount of shares sold as the dollar amount increases.
         When a shareholder  agrees to make  purchases of shares over a period
of time totaling a certain dollar amount  pursuant to a Letter of Intent,  the
Underwriter  and selling  dealers can expect to realize the economies of scale
applicable to that stated goal amount.  Thus the  Portfolio  imposes the sales
charge applicable to the goal amount.  Similarly,  the Underwriter and selling
dealers  also   experience   cost   savings   when   dealing   with   existing
shareholders,  enabling the  Portfolio  to afford  existing  shareholders  the
Right of  Accumulation.  The  Underwriter  and selling dealers can also expect
to realize  economies  of scale when  making  sales to the  members of certain
qualified  groups which agree to  facilitate  distribution  of the  Portfolio'
shares to their  members.  See  "Exhibit  A - Reduced  Sales  Charges"  in the
Prospectus.

- ------------------------------------------------------------------------------
                         DIVIDENDS AND DISTRIBUTIONS
- ------------------------------------------------------------------------------

         Each  Portfolio  declares  and  pays  monthly  dividends  of its  net
income  to  shareholders  of  record  as of the  close  of  business  on  each
designated  monthly  record  date.  Dividends  and  distributions  will differ
among the classes.  Net  investment  income  consists of the  interest  income
earned on investments  (adjusted for  amortization of original issue discounts
or premiums or market premiums),  less estimated  expenses.  Capital gains, if
any, are normally  paid once a year and will be  automatically  reinvested  at
net asset value in  additional  shares.  Dividends and any  distributions  are
automatically  reinvested in additional  shares of the Fund,  unless you elect
to have the  dividends  of $10 or more  paid in cash (by  check or by  Calvert
Money   Controller).   You  may  also  request  to  have  your  dividends  and
distributions  from the  Portfolio  invested  in shares  of any other  Calvert
Group Fund, at no additional  charge.  If you elect to have  dividends  and/or
distributions  paid in cash, and the U.S.  Postal Service returns the check as
undeliverable,  it, as well as future  dividends  and  distributions,  will be
reinvested in additional shares.

- ------------------------------------------------------------------------------
                                 TAX MATTERS
- ------------------------------------------------------------------------------

         Each   Portfolio   intends  to  continue  to  qualify  as   regulated
investment  companies under  Subchapter M of the Internal Revenue Code. If for
any  reason  a  Portfolio  should  fail to  qualify,  it  would  be taxed as a
corporation  at the Portfolio  level,  rather than passing  through its income
and gains to shareholders.
         Each  Portfolio's  dividends  of  net  investment  income  constitute
exempt-interest  dividends on which  shareholders are not generally subject to
federal  income  tax;  however  under  the  Act,  dividends   attributable  to
interest  on  certain  private  activity  bonds  must be  included  in federal
alternative  minimum  taxable income for the purpose of determining  liability
(if any) for  individuals and for  corporations.  Each  Portfolio's  dividends
derived from taxable  interest and  distributions  of net  short-term  capital
gains,  whether taken in cash or reinvested in additional  shares, are taxable
to  shareholders  as  ordinary  income and do not  qualify  for the  dividends
received  deduction  for  corporations.  If you held  shares for six months or
less,  losses must be offset by the amount of  exempt-interest  dividends  you
received,  and, to the extent of capital gain distributions you received,  the
loss  amount not offset  (disallowed)  must be  treated as  long-term  capital
loss.
         A  shareholder  may also be subject to some state and local  taxes on
dividends  and  distributions.  Each  Portfolio  will notify its  shareholders
annually  about the tax status of  dividends  and  distributions  paid and the
amount of dividends withheld, if any, during the previous year.
         The  Code  provides  that  interest  on   indebtedness   incurred  or
continued  in order to  purchase  or carry  shares of a  regulated  investment
company which  distributes  exempt-interest  dividends  during the year is not
deductible.  Furthermore,  entities or persons who are "substantial users" (or
persons  related to  "substantial  users") of  facilities  financed by private
activity bonds should consult their tax advisors before  purchasing  shares of
a  Portfolio.   "Substantial   user"  is  generally  defined  as  including  a
"nonexempt  person"  who  regularly  uses in  trade  or  business  a part of a
facility financed from the proceeds of private activity bonds.
         Each  Portfolio  may be  required to  withhold  31% of any  long-term
capital gain  dividends  and 31% of each  redemption  transaction  if: (a) the
shareholder's social security number or other taxpayer  identification  number
("TIN") is not provided or an  obviously  incorrect  TIN is provided;  (b) the
shareholder  does  not  certify  under  penalties  of  perjury  that  the  TIN
provided  is the  shareholder's  correct TIN and that the  shareholder  is not
subject  to  backup  withholding  under  section  3406(a)(1)(C)  of  the  Code
because of  underreporting  (however,  failure to provide  certification as to
the  application  of  section   3406(a)(1)(C)   will  result  only  in  backup
withholding  on  capital  gain  dividends,  not  on  redemptions);  or  (c)  a
Portfolio  is notified by the Internal  Revenue  Service that the TIN provided
by the  shareholder  is  incorrect  or that there has been  underreporting  of
interest or dividends by the shareholder.  Affected  shareholders will receive
statements at least annually specifying the amount withheld.
         In  addition,  each  Portfolio  is required to report to the Internal
Revenue  Service  the  following   information   with  respect  to  redemption
transactions:   (a)  the  shareholder's  name,  address,  account  number  and
taxpayer   identification   number;   (b)  the  total   dollar  value  of  the
redemptions; and (c) the identifying CUSIP number.
         Certain   shareholders   are,   however,   exempt   from  the  backup
withholding and broker reporting  requirements.  Exempt shareholders  include:
corporations;  financial institutions;  tax-exempt  organizations;  individual
retirement  plans;  the  U.S.,  a State,  the  District  of  Columbia,  a U.S.
possession,  a  foreign  government,  an  international  organization,  or any
political  subdivision,  agency, or  instrumentality  of any of the foregoing;
U.S.  registered  commodities or securities  dealers;  real estate  investment
trusts;  registered  investment  companies;  bank common trust funds;  certain
charitable  trusts;  and foreign  central banks of issue.  Nonresident  aliens
also are generally not subject to either  requirement  but, along with certain
foreign  partnerships  and  foreign  corporations,  may  instead be subject to
withholding under section 1441 of the Code.  Shareholders  claiming  exemption
from  backup  withholding  and  broker  reporting  should  call or  write  for
further information.

- ------------------------------------------------------------------------------
                             VALUATION OF SHARES
- ------------------------------------------------------------------------------

         Each  Portfolio's  assets are valued utilizing the average bid dealer
market quotation as furnished by an independent  pricing  service.  Securities
and other assets for which market  quotations  are not readily  available  are
valued  based on the  current  market for  similar  securities  or assets,  as
determined in good faith by the Fund's  Advisor under the  supervision  of the
Board of Directors.
         Valuations,  market  quotations and market  equivalents  are provided
by Kenny S&P  Evaluation  Services,  a subsidiary of  McGraw-Hill.  The use of
Kenny as a  pricing  service  by the Fund has been  approved  by the  Board of
Directors.  Valuations  provided  by Kenny are  determined  without  exclusive
reliance  on quoted  prices and take into  consideration  appropriate  factors
such as  institution-size  trading in  similar  groups of  securities,  yield,
quality,  coupon rate, maturity, type of issue, trading  characteristics,  and
other market data.
         Each  Portfolio  determines  the net asset value for its shares every
business  day at the  close  of the  regular  session  of the New  York  Stock
Exchange  (generally,  4:00 p.m. Eastern time), and at such other times as may
be necessary or  appropriate.  The Portfolios do not determine net asset value
on  certain  national  holidays  or  other  days on which  the New York  Stock
Exchange is closed:  New Year's Day, Martin Luther King Day,  Presidents' Day,
Good Friday,  Memorial Day,  Independence Day, Labor Day, Thanksgiving Day and
Christmas Day.

Net Asset Value and Offering Price Per Share
         National
         Net asset value per share
         ($________/________ shares)                             $__.__
         Maximum sales charge
         (2.75% of offering price)                                __.__
         Offering price per share                                $__.__

         California
         Net asset value per share
         ($________/________ shares)                             $__.__
         Maximum sales charge
         (2.75% of offering price)                                __.__
         Offering price per share                                $__.__

         Maryland
         Net asset value per share
         ($________/________ shares)                             $__.__
         Maximum sales charge
         (2.75% of offering price)                                __.__
         Offering price per share                                $__.__

         Virginia
         Net asset value per share
         ($________/________ shares)                             $__.__
         Maximum sales charge
         (2.75% of offering price)                                __.__
         Offering price per share                                $__.__

- ------------------------------------------------------------------------------
                    CALCULATION OF YIELD AND TOTAL RETURN
- ------------------------------------------------------------------------------

         Each  Portfolio  may advertise  its "total  return."  Total return is
historical  in nature and is not  intended  to  indicate  future  performance.
Total  return will be quoted for the most recent  one-year  period,  five-year
period,  and period  from  inception  of the  Portfolio's  offering of shares.
Return  quotations  for  periods in excess of one year  represent  the average
annual  total  return for the period  included  in the  particular  quotation.
Total return is a  computation  of the  Portfolio's  dividend  yield,  plus or
minus realized or unrealized capital  appreciation or depreciation,  less fees
and  expenses.   Total  return   quotations   reflect  the  deduction  of  the
Portfolio's  maximum  sales  charge  ("return  with  maximum  load"),   except
quotations  of "return  without  maximum  load"  which do not deduct the sales
charge.  Note:  "Total Return" as quoted in the Financial  Highlights  section
of the  Prospectus  and  Annual  Report  to  Shareholders,  however,  per  SEC
instructions,   does  not  reflect   deduction  of  the  sales   charge,   and
corresponds  to "return  without  maximum load" as referred to herein.  Return
without  maximum  load  should  be  considered  only  by  investors,  such  as
participants  in certain  pension  plans,  to whom the sales  charge  does not
apply, or for purposes of comparison  only with comparable  figures which also
do not  reflect  sales  charges,  such as  Lipper  averages.  Total  return is
computed according to the following formula:

                               P(1 + T)n = ERV

where P = a  hypothetical  initial  payment of $1,000;  T = total return;  n =
number of  years;  and ERV = the  ending  redeemable  value of a  hypothetical
$1,000  payment  made at the  beginning  of the 1, 5 or 10 year periods at the
end of such  periods (or portions  thereof,  if  applicable).  Returns for the
periods from inception through December 31, 1998 are as follows:

                           National                  National
                           With                      Without
                           Max. Load                 Max. Load

One Year                   4.15%                     7.11%
Five Year                  5.89%                     6.48%
From Inception             5.87%                     6.43%
(9/30/92)

                           California                California
                           With                      Without
                           Max. Load                 Max. Load

One Year                   4.15%                     7.11%
Five Year                  5.89%                     6.48%
From Inception             5.87%                     6.43%
(5/29/92)

                           Maryland                  Maryland
                           With                      Without
                           Max. Load                 Max. Load

One Year                   4.15%                     7.11%
Five Year                  5.89%                     6.48%
From Inception             5.87%                     6.43%
(9/30/93)

                           Virginia                  Virginia
                           With                      Without
                           Max. Load                 Max. Load

One Year                   4.15%                     7.11%
Five Year                  5.89%                     6.48%
From Inception             5.87%                     6.43%
(9/30/93)

         Each   Portfolio   may  also   advertise  its  "yield"  and  "taxable
equivalent  yield." As with total return,  both yield  figures are  historical
and are not  intended  to  indicate  future  performance.  "Yield"  quotations
refer to the aggregate imputed  yield-to-maturity  of investments based on the
market  value as of the last day of a given  thirty-day  or  one-month  period
less accrued  expenses  (net of  reimbursement),  divided by the average daily
number of outstanding  shares entitled to receive  dividends times the maximum
offering  price on the  last day of the  period  (so  that the  effect  of the
sales  charge  is  included  in  the  calculation),   compounded  on  a  "bond
equivalent,"  or  semi-annual,  basis.  Yield  is  computed  according  to the
following formula:

                         Yield = 2[(a-b/cd)+1)6 - 1]

where a =  dividends  and  interest  earned  during the  period;  b = expenses
accrued for the period (net of  reimbursement);  c = the average  daily number
of shares  outstanding  during  the  period  that  were  entitled  to  receive
dividends;  and d = the  maximum  offering  price per share on the last day of
the period.
         The  taxable  equivalent  yield  is the  yield an  investor  would be
required to obtain from  taxable  investments  to equal a  Portfolio's  yield,
all or a  portion  of which may be  exempt  from  federal  income  taxes.  The
taxable  equivalent  yield is  computed  by taking  the  portion  of the yield
exempt  from  federal  income  taxes and  multiplying  the  exempt  yield by a
factor  based on a stated  income tax rate,  then  adding  the  portion of the
yield that is not exempt from federal  income taxes.  The factor which is used
to calculate the tax  equivalent  yield is the  reciprocal  of the  difference
between 1 and the  applicable  income  tax rate,  which  will be stated in the
advertisement.
         For the  thirty-day  period ended  December  31, 1998,  the yield and
federal tax equivalent yields were as follows:

              December 31        36% federal         39.6% federal
              1998               tax equivalent      tax equivalent
              yield              yield               yield
- ------------------------------------------------------------------------------

National      _.__%              _.__%               _.__%
California    _.__%              _.__%               _.__%
Virginia      _.__%              _.__%               _.__%
Maryland      _.__%              _.__%               _.__%

- ------------------------------------------------------------------------------
                                 ADVERTISING
- ------------------------------------------------------------------------------

         The Fund or its affiliates may provide  information  such as, but not
limited  to,  the  economy,   investment   climate,   investment   principles,
sociological  conditions  and  political  ambiance.   Discussion  may  include
hypothetical  scenarios  or  lists of  relevant  factors  designed  to aid the
investor  in  determining   whether  the  Portfolio  is  compatible  with  the
investor's  goals.  The Fund may list  portfolio  holdings or give examples or
securities  that may have been  considered  for  inclusion  in the  Portfolio,
whether held or not.
         The Fund or its affiliates may supply  comparative  performance  data
and rankings from  independent  sources such as Donoghue's  Money Fund Report,
Bank Rate Monitor,  Money,  Forbes,  Lipper  Analytical  Services,  Inc.,  CDA
Investment  Technologies,  Inc.,  Wiesenberger  Investment  Companies Service,
Russell  2000/Small  Stock  Index,  Mutual  Fund Values  Morningstar  Ratings,
Mutual Fund  Forecaster,  Barron's,  The Wall Street  Journal,  and Schabacker
Investment  Management,  Inc.  Such  averages  generally  do not  reflect  any
front-  or  back-end  sales  charges  that  may be  charged  by  Funds in that
grouping.  The Fund may also cite to any source,  whether in print or on-line,
such as  Bloomberg,  in  order  to  acknowledge  origin  of  information.  The
Portfolio may compare itself or its portfolio  holdings to other  investments,
whether or not issued or  regulated  by the  securities  industry,  including,
but not limited to,  certificates  of deposit and  Treasury  notes.  The Fund,
its  Advisor,  and its  affiliates  reserve  the right to  update  performance
rankings as new rankings become available.
         Calvert   Group  is  the   nation's   leading   family  of   socially
responsible  mutual funds, both in terms of socially  responsible  mutual fund
assets  under  management,  and number of  socially  responsible  mutual  fund
portfolios  offered  (source:  Social  Investment  Forum,  December 31, 1998).
Calvert  Group was also the first to offer a family  of  socially  responsible
mutual fund portfolios.

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                            DIRECTORS AND OFFICERS
- ------------------------------------------------------------------------------

         Each Portfolio's Board of Trustees/Directors supervises the
Portfolio's activities and reviews its contracts with companies that provide
it with services.
         RICHARD  L.  BAIRD,  JR.,  Trustee.   Mr.  Baird  is  Executive  Vice
President for the Family Health Council, Inc. in Pittsburgh,  Pennsylvania,  a
non-profit  corporation  which provides family planning  services,  nutrition,
maternal/child  health care, and various health screening services.  Mr. Baird
is a  trustee/director  of each of the  investment  companies  in the  Calvert
Group of Funds,  except for Calvert Variable Series,  Inc.,  Calvert New World
Fund, Inc. and Calvert World Values Fund,  Inc. DOB:  05/09/48.  Address:  211
Overlook Drive, Pittsburgh, Pennsylvania 15216.
         FRANK H. BLATZ,  JR.,  Esq.,  Trustee.  Mr. Blatz is a partner in the
law firm of Snevily,  Ely,  Williams & Blatz.  He was  formerly a partner with
Abrams,  Blatz,  Gran,  Hendricks  &  Reina,  P.A.  He is also a  director  of
Calvert Variable Series, Inc. DOB: 10/29/35.  Address:  308 East Broad Street,
Westfield, New Jersey 07091.
         FREDERICK T. BORTS, M.D., Trustee. Dr. Borts is a radiologist with
Kaiser Permanente. Prior to that, he was a radiologist at Bethlehem Medical
Imaging in Allentown, Pennsylvania. DOB: 07/23/49. Address: 16 Iliahi
Street, Honolulu, Hawaii, 96817.
         CHARLES E. DIEHL,  Trustee.  Mr. Diehl is a self-employed  consultant
and  is  Vice  President  and  Treasurer  Emeritus  of the  George  Washington
University.   He  has  retired  from  University  Support  Services,  Inc.  of
Herndon,  Virginia.  Formerly,  he  was  a  Director  of  Acacia  Mutual  Life
Insurance   Company,   and  is  currently  a  Director  of  Servus   Financial
Corporation.   DOB:  10/13/22.  Address:  1658  Quail  Hollow  Court,  McLean,
Virginia 22101.
         DOUGLAS E. FELDMAN,  M.D.,  Trustee.  Dr. Feldman is managing partner
of  Feldman  Otolaryngology,  Head and Neck  Surgery  in  Washington,  D.C.  A
graduate  of  Harvard   Medical   School,   he  is   Associate   Professor  of
Otolaryngology,  Head and Neck  Surgery at  Georgetown  University  and George
Washington  University  Medical School, and past Chairman of the Department of
Otolaryngology,  Head and Neck Surgery at the Washington  Hospital Center.  He
is  included in The Best  Doctors in America.  DOB:  05/23/48.  Address:  7536
Pepperell Drive, Bethesda, Maryland 20817.
         PETER W. GAVIAN,  CFA, Trustee.  Mr. Gavian is President of Corporate
Finance of  Washington,  Inc.  Formerly,  he was a principal of Gavian De Vaux
Associates,  an  investment  banking  firm.  He is also a Chartered  Financial
Analyst and an accredited senior business appraiser.  DOB: 12/08/32.  Address:
3005 Franklin Road North, Arlington, Virginia 22201.
         JOHN G. GUFFEY,  JR., Trustee.  Mr. Guffey is chairman of the Calvert
Social  Investment  Foundation,  organizing  director of the Community Capital
Bank  in  Brooklyn,   New  York,   and  a  financial   consultant  to  various
organizations.  In addition,  he is a director of the Community Bankers Mutual
Fund of Denver,  Colorado,  a director of Ariel Funds,  and the  Treasurer and
Director of Silby,  Guffey,  and Co., Inc., a venture capital firm. Mr. Guffey
is a  trustee/director  of  each  of the  other  investment  companies  in the
Calvert Group of Funds,  except for Calvert Variable Series,  Inc. and Calvert
New World Fund, Inc.
        Mr.  Guffey  has  been  advised  that  the   Securities  and  Exchange
Commission  ("SEC")  has entered an order  against him  relating to his former
service as a director of  Community  Bankers  Mutual Fund,  Inc.  This fund is
not  connected  with  any  Calvert  Fund  or  the  Calvert  Group  and  ceased
operations  in  September,  1994.  Mr.  Guffey  consented  to the entry of the
order  without  admitting  or denying  the  findings  in the order.  The order
contains  findings (1) that the Community  Bankers  Mutual  Fund's  prospectus
and statement of additional  information  were materially false and misleading
because  they  misstated  or failed to state  material  facts  concerning  the
pricing of fund  shares  and the  percentage  of  illiquid  securities  in the
fund's  portfolio  and  that Mr.  Guffey,  as a member  of the  fund's  board,
should  have  known  of  these   misstatements  and  therefore   violated  the
Securities  Act of 1933;  (2) that the price of the fund's  shares sold to the
public  was not  based  on the  current  net  asset  value of the  shares,  in
violation  of the  Investment  Company  Act of 1940 (the  "Investment  Company
Act");  and (3) that the board of the fund,  including  Mr.  Guffey,  violated
the  Investment  Company Act by  directing  the filing of a  materially  false
registration  statement.  The order  directed  Mr.  Guffey to cease and desist
from  committing or causing  future  violations  and to pay a civil penalty of
$5,000.  The SEC placed no restrictions  on Mr.  Guffey's  continuing to serve
as a Trustee or Director of mutual funds. DOB:  05/15/48.  Address:  388 Calli
Calina, Santa Fe, New Mexico 87501.
         *BARBARA J. KRUMSIEK,  President and Trustee.  Ms. Krumsiek serves as
President,  Chief Executive  Officer and Vice Chairman of Calvert Group,  Ltd.
and as an officer and director of each of its affiliated  companies.  She is a
director of Calvert-Sloan  Advisers,  L.L.C., and a  trustee/director  of each
of the  investment  companies in the Calvert Group of Funds.  Ms.  Krumsiek is
the President of each of the investment  companies,  except for Calvert Social
Investment  Fund, of which she is the Senior Vice President.  Prior to joining
Calvert Group,  Ms.  Krumsiek  served as a Managing  Director of Alliance Fund
Distributors, Inc. DOB: 08/09/52.
         M. CHARITO  KRUVANT,  Trustee.  Ms.  Kruvant is President  and CEO of
Creative  Associates  International,  Inc., a firm that  specializes  in human
resources  development,  information  management,  public  affairs and private
enterprise  development.  She is also a  director  of Acacia  Federal  Savings
Bank. DOB: 12/08/45.  Address: 5301 Wisconsin Avenue, N.W.,  Washington,  D.C.
20015.
         ARTHUR J. PUGH,  Trustee.  Mr. Pugh is a Director of Calvert Variable
Series,  Inc., and serves as a director of Acacia Federal  Savings Bank.  DOB:
09/24/37. Address: 4823 Prestwick Drive, Fairfax, Virginia 22030.
         *DAVID R. ROCHAT,  Senior Vice  President and Trustee.  Mr. Rochat is
Executive Vice President of Calvert Asset Management  Company,  Inc., Director
and Secretary of Grady,  Berwald and Co.,  Inc., and Director and President of
Chelsea  Securities,  Inc. He is the Senior Vice  President of First  Variable
Rate Fund,  Calvert Tax-Free  Reserves,  Calvert Municipal Fund, Inc., Calvert
Cash  Reserves,  and  The  Calvert  Fund.  DOB:  10/07/37.  Address:  Box  93,
Chelsea, Vermont 05038.
         *D. WAYNE SILBY, Esq.,  Trustee.  Mr. Silby is a trustee/director  of
each of the  investment  companies in the Calvert  Group of Funds,  except for
Calvert  Variable  Series,  Inc.  and  Calvert New World  Fund.  Mr.  Silby is
Executive  Chairman  of Group  Serve,  Inc.,  an internet  company  focused on
community  building   collaborative  tools,  and  an  officer,   director  and
shareholder  of  Silby,  Guffey &  Company,  Inc.,  which  serves  as  general
partner  of  Calvert  Social  Venture  Partners  ("CSVP").  CSVP is a  venture
capital firm investing in socially  responsible small companies.  He is also a
Director of Acacia Mutual Life  Insurance  Company.  DOB:  07/20/48.  Address:
1715 18th Street, N.W., Washington, D.C. 20009.
         RENO J. MARTINI,  Senior Vice  President.  Mr.  Martini is a director
and Senior Vice  President of Calvert  Group,  Ltd., and Senior Vice President
and Chief  Investment  Officer of Calvert Asset Management  Company,  Inc. Mr.
Martini is also a director and President of  Calvert-Sloan  Advisers,  L.L.C.,
and a director and officer of Calvert New World Fund. DOB: 1/13/50.
         RONALD M.  WOLFSHEIMER,  CPA,  Treasurer.  Mr.  Wolfsheimer is Senior
Vice  President and Chief  Financial  Officer of Calvert  Group,  Ltd. and its
subsidiaries and an officer of each of the other  investment  companies in the
Calvert Group of Funds.  Mr.  Wolfsheimer  is Vice  President and Treasurer of
Calvert-Sloan Advisers,  L.L.C., and a director of Calvert Distributors,  Inc.
DOB: 07/24/47.
         WILLIAM  M.  TARTIKOFF,  Esq.,  Vice  President  and  Secretary.  Mr.
Tartikoff  is an officer of each of the  investment  companies  in the Calvert
Group of Funds, and is Senior Vice President,  Secretary,  and General Counsel
of Calvert Group,  Ltd., and each of its  subsidiaries.  Mr. Tartikoff is also
Vice President and Secretary of  Calvert-Sloan  Advisers,  L.L.C.,  a director
of Calvert  Distributors,  Inc.,  and is an officer  of Acacia  National  Life
Insurance Company. DOB: 08/12/47.
         DANIEL K. HAYES,  Vice  President.  Mr.  Hayes is Vice  President  of
Calvert  Asset  Management  Company,  Inc.,  and is an  officer of each of the
other investment  companies in the Calvert Group of Funds,  except for Calvert
New World Fund, Inc. DOB: 09/09/50.
         SUSAN  WALKER  BENDER,  Esq.,  Assistant  Secretary.  Ms.  Bender  is
Associate  General  Counsel of Calvert  Group,  Ltd. and an officer of each of
its subsidiaries  and  Calvert-Sloan  Advisers,  L.L.C. She is also an officer
of each of the  other  investment  companies  in the  Calvert  Group of Funds.
DOB: 01/29/59.
         KATHERINE STONER, Esq., Assistant Secretary. Ms. Stoner is
Associate General Counsel of Calvert Group and an officer of each of its
subsidiaries and Calvert-Sloan Advisers, L.L.C. She is also an officer of
each of the other investment companies in the Calvert Group of Funds. DOB:
10/21/56.
         IVY WAFFORD DUKE, Esq.,  Assistant  Secretary.  Ms. Duke is Associate
General  Counsel of Calvert  Group and an officer of each of its  subsidiaries
and  Calvert-Sloan  Advisers,  L.L.C.  She is also an  officer  of each of the
other  investment  companies in the Calvert  Group of Funds and  Secretary and
provides  counsel  to the  Calvert  Social  Investment  Foundation.  Prior  to
working  at  Calvert  Group,  Ms.  Duke  was an  Associate  in the  Investment
Management  Group of the Business and Finance  Department at Drinker  Biddle &
Reath. DOB: 09/07/68.

         The address of directors and officers,  unless  otherwise  noted,  is
4550 Montgomery Avenue, Suite 1000N,  Bethesda,  Maryland 20814.  Trustees and
officers  of the Fund as a group  own less than 1% of the  Fund's  outstanding
shares.  Trustees  marked with an *, above,  are  "interested  persons" of the
Fund,  under the  Investment  Company Act of 1940.  Directors  and officers of
the Fund as a group own less than 1% of each Portfolio's outstanding shares.
         Each of the above  directors  and officers is a trustee or officer of
other  investment  companies  in the  Calvert  Group of Funds  except  Calvert
Social  Investment  Fund,  and Calvert World Values Fund,  Inc., of which only
Messrs.   Baird,   Guffey,   and  Silby  and  Ms.   Krumsiek   are  among  the
trustees/directors;  Calvert  Variable  Series,  Inc.,  of which only  Messrs.
Blatz,  Diehl,  and  Pugh and Ms.  Krumsiek  and Ms.  Kruvant  are  among  the
directors,  and Calvert New World Fund,  Inc., of which only and Ms.  Krumsiek
and Mr. Martini are among the directors.
         The  Audit  Committee  of the  Board  of  Directors  is  composed  of
Messrs. Baird, Blatz,  Feldman,  Guffey and Pugh, and Ms. Kruvant. The Board's
Investment  Policy  Committee  is composed of Messrs.  Borts,  Diehl,  Gavian,
Rochat, and Silby, and Ms. Krumsiek.
         During  fiscal 1998,  directors of the Fund not  affiliated  with the
Fund's Advisor were paid $______.  Directors of the Fund not  affiliated  with
the  Advisor  currently  receive  an annual fee of  $20,500  for  service as a
member of the Board of  Trustees/Directors  of the Calvert Group of Funds plus
a fee of $750 to $1,500 for each Board and Committee  meeting  attended;  such
fees are allocated among the Funds on the basis of their net assets.
         Directors  not  affiliated  with  the  Advisor  may  elect  to  defer
receipt of all or a  percentage  of their fees and invest  them in any fund in
the Calvert of Funds  through  the  Trustees/Directors  Deferred  Compensation
Plan  (shown  as  "Pension  or  Retirement  Benefits  Accrued  as part of Fund
Expenses,"  below).  Deferral of the fees is designed to maintain  the parties
in the same position as if the fees were paid on a current  basis.  Management
believes   this  will  have  a  negligible   effect  on  the  Fund's   assets,
liabilities,  net  assets,  and net  income per share,  and will  ensure  that
there is no duplication of advisory fees.

                         Director Compensation Table

Fiscal Year 1998      Aggregate         Pension or        Total Compensation
                      Compensation      Retirement        from Benefits
(unaudited numbers)   from Registrant   Accrued as        Registrant and Fund
                      for Service       part of           Complex paid to
                      as Director       of Registrant     Director **
                                        Expenses*

Name of Director

Richard L. Baird, Jr. $____             $0                $39,550
Frank H. Blatz, Jr.   $____             $$____            $42,100
Frederick T. Borts    $____             $0                $33,250
Charles E. Diehl      $____             $____             $41,500
Douglas E. Feldman    $____             $0                $36,250
Peter W. Gavian       $____             $____             $36,250
John G. Guffey, Jr.   $____             $0                $62,665
M. Charito Kruvant    $____             $____             $36,250
Arthur J. Pugh        $____             $0                $41,500
D. Wayne Silby        $____             $0                $67,780

*Messrs. Blatz, Diehl, Gavian and Pugh and Ms. Kruvant have chosen to defer
a portion of their compensation. As of December 31, 1998, total deferred
compensation, including dividends and capital appreciation, was $644,247.37,
$672,374.09, $172,445.85, $216,322.53, and $23,295.55, for each trustee,
respectively.
**As of December 31, 1997. The Fund Complex consists of nine (9) registered
investment companies.

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                              INVESTMENT ADVISOR
- ------------------------------------------------------------------------------

         The Fund's  Investment  Advisor is Calvert Asset Management  Company,
Inc.,  4550  Montgomery  Avenue,  Suite 1000N,  Bethesda,  Maryland  20814,  a
subsidiary  of  Calvert  Group,  Ltd.,  which is a  controlled  subsidiary  of
Ameritas Acacia Mutual Holding Company of Lincoln, Nebraska.
         The  Advisory  Contract  between the Fund and the Advisor will remain
in effect  indefinitely,  provided  continuance  is approved at least annually
by the vote of the  holders of a  majority  of the  outstanding  shares of the
Fund,  or by the  directors  of the  Fund;  and  further  provided  that  such
continuance  is  also  approved  annually  by the  vote of a  majority  of the
directors  of the Fund  who are not  parties  to the  Contract  or  interested
persons of such  parties,  cast in person at a meeting  called for the purpose
of voting on such  approval.  The Contract may be terminated  without  penalty
by  either  party  on  60  days'  prior  written  notice;   it   automatically
terminates in the event of its assignment.
         Under  the  Contract,   the  Advisor   manages  the   investment  and
reinvestment  of the Fund's  assets,  subject to the  direction and control of
the Fund's  Board of  Directors.  For its  services,  the Advisor  receives an
annual fee of 0.60% of the first  $500  million  of each  Portfolio's  average
daily net assets,  0.50% of the next $500  million of such  assets,  and 0.40%
of all assets over $1 billion.
         The advisory fee is payable  monthly.  The Advisor reserves the right
(i)  to  waive  all or a part  of its  fee  and  (ii)  to  compensate,  at its
expense,   broker-dealers   in   consideration   of  their   promotional   and
administrative  services.  During fiscal years 1996,  1997, and 1998, the Fund
paid advisory fees of $275,574, $285,023, and $________, respectively.
         The Advisor  provides the Fund with  investment  advice and research,
pays the  salaries and fees of all  directors  and  executive  officers of the
Fund who are  principals  of the Advisor,  and pays  certain Fund  advertising
and promotional  expenses.  The Fund pays other  administrative  and operating
expenses,   including:   custodial  fees;  shareholder   servicing,   dividend
disbursing  and transfer  agency fees;  administrative  service fees;  federal
and  state   securities   registration   fees;   insurance   premiums;   trade
association  dues;  interest,  taxes and other business fees;  legal and audit
fees; and brokerage  commissions and other costs  associated with the purchase
and sale of portfolio securities.

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                           ADMINISTRATIVE SERVICES
- ------------------------------------------------------------------------------

         Calvert  Administrative  Services Company, a wholly-owned  subsidiary
of Calvert  Group,  Ltd.,  has been  retained  by the Fund to provide  certain
administrative   services   necessary  to  the  conduct  of  each  Portfolio's
affairs.  Such services  include the  preparation  of corporate and regulatory
reports and filings,  and the oversight of portfolio  accounting and the daily
determination  of net  investment  income  and  net  asset  value  per  share.
Calvert  Administrative  Services Company is entitled to receive an annual fee
of 0.10% of each  Portfolio's  average net assets for providing such services.
The fees paid by each Portfolio to Calvert  Administrative  Services  Company,
Inc. for fiscal years 1996, 1997, and 1998 are shown below:

              1996             1997              1998
National      $____            $____             $____
California    $____            $____             $____
Maryland      $____            $____             $____
Virginia      $____            $____             $____

- ------------------------------------------------------------------------------
                            METHOD OF DISTRIBUTION
- ------------------------------------------------------------------------------

         The Fund has entered  into an agreement  with  Calvert  Distributors,
Inc.  ("CDI"),   whereby  CDI,  acting  as  principal  underwriter,   makes  a
continuous  offering  of  each  Portfolio's  securities  on a  "best  efforts"
basis.  Prior  to  April  1,  1995,  the  principal  underwriter  was  Calvert
Securities  Corporation ("CSC").  Under the terms of the agreement,  CDI bears
all its expenses of providing  services  pursuant to the agreement,  including
payment of any  commissions  and service fees.  CDI receives all sales charges
imposed on the  Portfolios'  shares and  compensates  broker-dealer  firms for
sales of such shares.  CDI is entitled to receive a distribution  fee pursuant
to the Distribution  Plans (see below).  For Class B shares,  CDI receives any
CDSC paid.  For fiscal years 1996,  1997, and 1998, CDI received sales charges
in excess of the dealer reallowance as shown below:

              1996             1997              1998
National      $13,952          $11,597           $____
California    $14,066          $15,411           $____
Maryland      $4,214           $7,100            $____
Virginia      $9,039           $7,697            $____

         Pursuant  to Rule  12b-1  under the  Investment  Company  Act of 1940
("1940  Act"),  the Fund has  adopted a Class A and B  Distribution  Plan (the
"Plan")  which  permit  it  to  pay  certain  expenses   associated  with  the
distribution  of its  shares.  Such  expenses  may not  exceed,  on an  annual
basis,  0.25%  and  1.00% of the  Portfolio  average  Class A and B daily  net
assets,  respectively.  No  Distribution  Plan  expenses  were  paid in fiscal
1996, 1997, and 1998.
         The Plan was approved by the Board of  Directors/Trustees,  including
the  Directors/Trustees  who are not  "interested  persons"  of the  Funds (as
that term is  defined  in the 1940  Act) and who have no  direct  or  indirect
financial  interest in the operation of the Plan or in any agreements  related
to the Plan.  The selection and nomination of the  Directors/Trustees  who are
not  interested  persons of the Fund is  committed to the  discretion  of such
disinterested    Directors/Trustees.    In   establishing    the   Plan,   the
Directors/Trustees  considered  various  factors  including  the amount of the
distribution   fee.  The   Directors/Trustees   determined  that  there  is  a
reasonable  likelihood  that  the  Plan  will  benefit  the  Funds  and  their
shareholders.
         The  Plan  may  be   terminated   by  vote  of  a  majority   of  the
non-interested  Directors/Trustees  who have no direct or  indirect  financial
interest in the Plan,  or by vote of a majority of the  outstanding  shares of
the  Portfolio.  Any change in the Plan that  would  materially  increase  the
distribution  cost to the  Portfolio  requires  approval of the  shareholders;
otherwise,  the Plan may be amended  by the  Directors/Trustees,  including  a
majority of the non-interested Directors/Trustees as described above.
         The  Plan  will  continue  in  effect   successive   one-year  terms,
provided that such  continuance is specifically  approved by (i) the vote of a
majority  of the  Directors/Trustees  who  are  not  parties  to the  Plan  or
interested  persons  of any such  party  and who have no  direct  or  indirect
financial  interest  in the  Plan,  and  (ii) the  vote of a  majority  of the
entire Board of Directors/Trustees.
         Apart from the Plan,  the Advisor,  at its  expense,  may incur costs
and pay expenses associated with the distribution of shares of the Fund.
         Certain   broker/dealers,    and/or   other   persons   may   receive
compensation  from the investment  advisor,  underwriter,  or their affiliates
for the sale and  distribution  of the securities or for services to the Fund.
Such  compensation may include  additional  compensation  based on assets held
through  that firm beyond the  regularly  scheduled  rates,  and  finders' fee
payments to firms whose  representatives  are responsible for soliciting a new
account  where the  accountholder  does not choose to  purchase  through  that
firm.

- ------------------------------------------------------------------------------
                   TRANSFER AND SHAREHOLDER SERVICING AGENT
- ------------------------------------------------------------------------------

         National  Financial Data  Services,  Inc.  ("NFDS"),  a subsidiary of
State  Street Bank & Trust,  has been  retained by the Fund to act as transfer
agent  and  dividend   disbursing  agent.  These   responsibilities   include:
responding to certain  shareholder  inquiries and instructions,  crediting and
debiting  shareholder  accounts for purchases and  redemptions  of Fund shares
and confirming such transactions,  and daily updating of shareholder  accounts
to reflect declaration and payment of dividends.
         Calvert  Shareholder   Services,   Inc.  ("CSSI"),  a  subsidiary  of
Calvert  Group,  Ltd.,  has been  retained  by the Fund to act as  shareholder
servicing agent.  Shareholder  servicing  responsibilities  include responding
to  shareholder   inquiries  and   instructions   concerning  their  accounts,
entering  any  telephoned  purchases  or  redemptions  into the  NFDS  system,
maintenance of broker-dealer  data, and preparing and distributing  statements
to shareholders regarding their accounts.  Calvert Shareholder Services,  Inc.
was the sole transfer agent prior to January 1, 1998.
         For these  services,  NFDS and  Calvert  Shareholder  Services,  Inc.
receive  a  total  fee  of  $14.00  per  shareholder  account  and  $1.60  per
shareholder transaction.

- ------------------------------------------------------------------------------
                    INDEPENDENT ACCOUNTANTS AND CUSTODIANS
- ------------------------------------------------------------------------------

         PricewaterhouseCoopers   LLP  has  been  selected  by  the  Board  of
Directors  to serve as  independent  accountants  of the Fund for fiscal  year
1999. State Street Bank & Trust Company,  N.A., 225 Franklin  Street,  Boston,
MA 02110,  serves as custodian of the Portfolio'  investments.  First National
Bank of Maryland, 25 South Charles Street,  Baltimore,  Maryland 21203 acts as
custodian  of  certain  of cash  assets.  Neither  custodian  has any  part in
deciding the Fund's  investment  policies or the choice of securities that are
to be purchased or sold by each Portfolio.

- ------------------------------------------------------------------------------
                            PORTFOLIO TRANSACTIONS
- ------------------------------------------------------------------------------

         Portfolio   transactions   are  undertaken  on  the  basis  of  their
desirability  from an  investment  standpoint.  Investment  decisions  and the
choice of brokers  and dealers  are made by the  Advisor  under the  direction
and supervision of the Board of Directors.
         Broker-dealers  who execute portfolio  transactions on behalf of each
Portfolio are selected on the basis of their  professional  capability and the
value and quality of their services.  The Advisor  reserves the right to place
orders for the purchase or sale of portfolio  securities  with  broker-dealers
who have sold shares of each  Portfolio  or who  provide it with  statistical,
research,  or  other  information  and  services.   Although  any  statistical
research or other information and services  provided by broker-dealers  may be
useful to the Advisor,  the dollar value of such  information  and services is
generally  indeterminable,  and its  availability or receipt does not serve to
materially reduce the Advisor's normal research activities or expenses.
         The Advisor may also execute  portfolio  transactions with or through
broker-dealers  who have sold shares of each  Portfolio.  However,  such sales
will  not  be a  qualifying  or  disqualifying  factor  in  a  broker-dealer's
selection nor will the selection of any  broker-dealer  be based on the volume
of shares sold. The Advisor or its affiliate may  compensate,  at its expense,
broker-dealers  in  consideration  of  their  promotional  and  administrative
services.
         The  portfolio  turnover  is shown  below for  fiscal  years 1997 and
1998:

              1997             1998
National      29%              __%
California    48%              __%
Maryland      8%               __%
Virginia      4%               __%

- ------------------------------------------------------------------------------
                             GENERAL INFORMATION
- ------------------------------------------------------------------------------

         The  Fund  was   organized  as  a   corporation   under  the  General
Corporation  Law of the State of Maryland  on  February 4, 1992.  The Fund has
four  Portfolios:   Calvert  National  Municipal  Intermediate  Fund,  Calvert
California   Municipal   Intermediate   Fund,   Calvert   Maryland   Municipal
Intermediate  Fund, and Calvert Virginia  Municipal  Intermediate  Fund. Prior
to March 1, 1994,  Calvert National  Municipal  Intermediate Fund was known as
Calvert Intermediate Municipal Fund.
         Each Portfolio will send its shareholders  unaudited  semi-annual and
audited  annual  reports that will include the  Portfolio' net asset value per
share,  portfolio  securities,   income  and  expenses,  and  other  financial
information.
         The Fund  offers two  separate  classes of shares:  Class A and Class
B. Each class  represents  interests in the same portfolio of investments but,
as further  described  in the  prospectus,  each class is subject to differing
sales charges and  expenses,  which  differences  will result in differing net
asset  values  and   distributions.   Upon  any   liquidation   of  the  Fund,
shareholders  of each class are  entitled  to share pro rata in the net assets
belonging to that Portfolio available for distribution.
         Each  share  of  the  Portfolio  represents  an  equal  proportionate
interest  in that  Portfolio  with each other  share and is  entitled  to such
dividends and  distributions  out of the income  belonging to the Portfolio as
declared by the Board.  Upon any  liquidation of the  Portfolio,  shareholders
are entitled to share pro rata in the net assets available for distribution.
         This  Statement of  Additional  Information  does not contain all the
information in the Fund's registration  statement.  The registration statement
is on file with the  Securities  and Exchange  Commission  and is available to
the public.

- ------------------------------------------------------------------------------
             CONTROL PERSONS AND PRINCIPAL HOLDERS OF SECURITIES
- ------------------------------------------------------------------------------

         As of ________,  1999, the following  shareholder(s)  owned of record
5% of shares as shown below:

         Name and Address                            % of Ownership

         [insert info]

- ------------------------------------------------------------------------------
                                   APPENDIX
- ------------------------------------------------------------------------------

Municipal Obligations
         Municipal   obligations  are  debt  obligations   issued  by  states,
cities,  municipalities,  and  their  agencies  to obtain  funds  for  various
public  purposes.  Such purposes  include the  construction of a wide range of
public  facilities,  the refunding of outstanding  obligations,  the obtaining
of funds for  general  operating  expenses,  and the lending of funds to other
public institutions and facilities.  In addition,  certain types of industrial
development  bonds are issued by or on behalf of public  authorities to obtain
funds  for many  types of  local,  privately  operated  facilities.  Such debt
instruments  are  considered  municipal  obligations  if the interest  paid on
them is exempt from  federal  income tax in the opinion of bond counsel to the
issuer.  Although the  interest  paid on the  proceeds  from private  activity
bonds  used  for  the  construction,   equipment,  repair  or  improvement  of
privately  operated  industrial  or commercial  facilities  may be exempt from
federal income tax,  current  federal tax law places  substantial  limitations
on the size of such issues.
         Municipal  obligations  are generally  classified as either  "general
obligation" or "revenue"  bonds.  General  obligation bonds are secured by the
issuer's  pledge of its  faith,  credit and  taxing  power for the  payment of
principal  and interest.  Revenue bonds are payable from the revenues  derived
from a  particular  facility or class of  facilities  or, in some cases,  from
the proceeds of a special excise tax or other  specific  revenue  source,  but
not from the general taxing power.  Tax-exempt  industrial  development  bonds
are in most cases revenue  bonds and do not generally  carry the pledge of the
credit of the issuing  municipality.  There are, of course,  variations in the
security of municipal  obligations,  both within a  particular  classification
and among classifications.
         Municipal  obligations are generally  traded on the basis of a quoted
yield  to  maturity,  and  the  price  of the  security  is  adjusted  so that
relative  to the stated  rate of  interest  it will  return the quoted rate to
the purchaser.
         Short-term  and  limited-term   municipal   obligations  include  Tax
Anticipation  Notes,  Revenue  Anticipation  Notes, Bond  Anticipation  Notes,
Construction   Loan  Notes,  and  Discount  Notes.  The  maturities  of  these
instruments  at the time of issue  generally  will range  between three months
and one year.  Pre-Refunded  Bonds with longer nominal maturities that are due
to be retired  with the  proceeds  of an escrowed  subsequent  issue at a date
within  one  year  and  three  years  of the  time  of  acquisition  are  also
considered short-term and limited-term municipal obligations.

Municipal Bond and Note Ratings

Description  of  Moody's  Investors  Service,  Inc.'s  ratings  of  state  and
municipal notes:
         Moody's  ratings for state and municipal  notes and other  short-term
obligations   are  designated   Moody's   Investment   Grade   ("MIG").   This
distinction is in recognition of the  differences  between  short-term  credit
risk and long-term risk.
         MIG 1:  Notes  bearing  this  designation  are of the  best  quality,
enjoying  strong  protection  from  established  cash flows of funds for their
servicing  or from  established  and  broad-based  access  to the  market  for
refinancing, or both.
         MIG2:  Notes  bearing  this  designation  are of high  quality,  with
margins of protection ample although not so large as in the preceding group.
         MIG3: Notes bearing this designation are of favorable  quality,  with
all security  elements  accounted for but lacking the  undeniable  strength of
the  preceding  grades.  Market  access for  refinancing,  in  particular,  is
likely to be less well established.
         MIG4:  Notes  bearing  this  designation  are  of  adequate  quality,
carrying  specific risk but having  protection  commonly  regarded as required
of an investment security and not distinctly or predominantly speculative.

Description of Moody's  Investors  Service  Inc.'s/Standard & Poor's municipal
bond ratings:
         Aaa/AAA:  Best  quality.  These  bonds carry the  smallest  degree of
investment  risk  and are  generally  referred  to as  "gilt  edge."  Interest
payments are  protected by a large or by an  exceptionally  stable  margin and
principal is secure.  This rating  indicates an extremely  strong  capacity to
pay principal and interest.
         Aa/AA:   Bonds   rated  AA  also   qualify   as   high-quality   debt
obligations.  Capacity to pay  principal  and interest is very strong,  and in
the  majority of instances  they differ from AAA issues only in small  degree.
They are rated lower than the best bonds  because  margins of  protection  may
not be as large as in Aaa securities,  fluctuation of protective  elements may
be of greater  amplitude,  or there may be other  elements  present which make
long-term risks appear somewhat larger than in Aaa securities.
         A/A:  Upper-medium  grade  obligations.  Factors  giving  security to
principal and interest are  considered  adequate,  but elements may be present
which  make the bond  somewhat  more  susceptible  to the  adverse  effects of
circumstances and economic conditions.
         Baa/BBB:   Medium  grade   obligations;   adequate  capacity  to  pay
principal and  interest.  Whereas they normally  exhibit  adequate  protection
parameters,  adverse economic  conditions or changing  circumstances  are more
likely to lead to a  weakened  capacity  to pay  principal  and  interest  for
bonds in this category than for bonds in the A category.
         Ba/BB,  B/B,  Caa/CCC,  Ca/CC:  Debt  rated  in these  categories  is
regarded  as  predominantly  speculative  with  respect  to  capacity  to  pay
interest  and repay  principal.  There  may be some  large  uncertainties  and
major  risk  exposure  to  adverse  conditions.   The  higher  the  degree  of
speculation, the lower the rating.
         C/C: This rating is only for no-interest income bonds.
         D: Debt in  default;  payment  of  interest  and/or  principal  is in
arrears.

<PAGE>

                               LETTER OF INTENT

                           
Date

Calvert Distributors, Inc.
4550 Montgomery Avenue
Bethesda, MD 20814

Ladies and Gentlemen:

         By signing this Letter of Intent, or affirmatively marking the
Letter of Intent option on my Fund Account Application Form, I agree to be
bound by the terms and conditions applicable to Letters of Intent appearing
in the Prospectus and the Statement of Additional Information for the Fund
and the provisions described below as they may be amended from time to time
by the Fund. Such amendments will apply automatically to existing Letters of
Intent.

         I intend to invest in the shares of:________________ (Fund or
Portfolio name) during the thirteen (13) month period from the date of my
first purchase pursuant to this Letter (which cannot be more than ninety
(90) days prior to the date of this Letter or my Fund Account Application
Form, whichever is applicable), an aggregate amount (excluding any
reinvestments of distributions) of at least fifty thousand dollars ($50,000)
which, together with my current holdings of the Fund (at public offering
price on date of this Letter or my Fund Account Application Form, whichever
is applicable), will equal or exceed the amount checked below:

         __ $50,000 __ $100,000 __ $250,000 __ $500,000 __ $1,000,000

         Subject to the conditions specified below, including the terms of
escrow, to which I hereby agree, each purchase occurring after the date of
this Letter will be made at the public offering price applicable to a single
transaction of the dollar amount specified above, as described in the Fund's
prospectus. "Fund" in this Letter of Intent shall refer to the Fund or
Portfolio, as the case may be, here indicated. No portion of the sales
charge imposed on purchases made prior to the date of this Letter will be
refunded.

         I am making no commitment to purchase shares, but if my purchases
within thirteen months from the date of my first purchase do not aggregate
the minimum amount specified above, I will pay the increased amount of sales
charges prescribed in the terms of escrow described below. I understand that
4.75% of the minimum dollar amount specified above will be held in escrow in
the form of shares (computed to the nearest full share). These shares will
be held subject to the terms of escrow described below.

         From the initial purchase (or subsequent purchases if necessary),
4.75% of the dollar amount specified in this Letter shall be held in escrow
in shares of the Fund by the Fund's transfer agent. For example, if the
minimum amount specified under the Letter is $50,000, the escrow shall be
shares valued in the amount of $2,375 (computed at the public offering price
adjusted for a $50,000 purchase). All dividends and any capital gains
distribution on the escrowed shares will be credited to my account.

         If the total minimum investment specified under the Letter is
completed within a thirteen month period, escrowed shares will be promptly
released to me. However, shares disposed of prior to completion of the
purchase requirement under the Letter will be deducted from the amount
required to complete the investment commitment.

         Upon expiration of this Letter, the total purchases pursuant to the
Letter are less than the amount specified in the Letter as the intended
aggregate purchases, Calvert Distributors, Inc. ("CDI") will bill me for an
amount equal to the difference between the lower load I paid and the dollar
amount of sales charges which I would have paid if the total amount
purchased had been made at a single time. If not paid by the investor within
20 days, CDI will debit the difference from my account. Full shares, if any,
remaining in escrow after the aforementioned adjustment will be released
and, upon request, remitted to me.

         I irrevocably constitute and appoint CDI as my attorney-in-fact,
with full power of substitution, to surrender for redemption any or all
escrowed shares on the books of the Fund. This power of attorney is coupled
with an interest.

         The commission allowed by Calvert Distributors, Inc. to the
broker-dealer named herein shall be at the rate applicable to the minimum
amount of my specified intended purchases.

         The Letter may be revised upward by me at any time during the
thirteen-month period, and such a revision will be treated as a new Letter,
except that the thirteen-month period during which the purchase must be made
will remain unchanged and there will be no retroactive reduction of the
sales charges paid on prior purchases.

         In determining the total amount of purchases made hereunder, shares
disposed of prior to termination of this Letter will be deducted. My
broker-dealer shall refer to this Letter of Intent in placing any future
purchase orders for me while this Letter is in effect.


                                                     
Dealer

                                                     
Name of Investor(s)

By                                                   
     Authorized Signer

                                                     
Address

                                                     
Signature of Investor(s)

                                                     
Date

                                                     
Signature of Investor(s)

                                                     
Date

<PAGE>

                         Calvert Municipal Fund, Inc.
                 CALVERT NATIONAL MUNICIPAL INTERMEDIATE FUND
                CALVERT CALIFORNIA MUNICIPAL INTERMEDIATE FUND
                 CALVERT MARYLAND MUNICIPAL INTERMEDIATE FUND
                 CALVERT VIRGINIA MUNICIPAL INTERMEDIATE FUND

                     Statement of Additional Information
                                April 30, 1999

INVESTMENT ADVISOR
Calvert Asset Management Company, Inc.
4550 Montgomery Avenue
Suite 1000N
Bethesda, Maryland 20814

SHAREHOLDER SERVICE
Calvert Shareholder Services, Inc.
4550 Montgomery Avenue
Suite 1000N
Bethesda, Maryland 20814

PRINCIPAL UNDERWRITER
Calvert Distributors, Inc.
4550 Montgomery Avenue
Suite 1000N
Bethesda, Maryland 20814

TRANSFER AGENT
National Financial Data Services, Inc.
330 W. 9th Street
Kansas City, Missouri 64105

INDEPENDENT ACCOUNTANTS
PricewaterhouseCoopers LLP
250 West Pratt Street
Baltimore, Maryland 21201


<PAGE>

PART C. OTHER INFORMATION


Item 23. Exhibits

         1.  Articles of Incorporation, (incorporated by reference to
Registrant's Pre-Effective Amendment No. 2, April 27, 1992, and as amended,
incorporated by reference to Registrant's Pre-Effective Amendment No. 3, May
21, 1992).

         2.  By-Laws (incorporated by reference to Registrant's
Pre-Effective Amendment No. 2, April 27, 1992).

         4.  Specimen Stock Certificate for Calvert California Municipal
Intermediate Fund, (incorporated by reference to Registrant's Post-Effective
Amendment No. 1, filed July 27, 1992).

         5.  Investment Advisory Contract (incorporated by reference to
Registrant's Pre-Effective Amendment No. 2, April 27, 1992).

         6.  Underwriting Agreement, (incorporated by reference to
Registrant's Post-Effective Amendment No. 15, filed April 30, 1998).

         7.  Directors' Deferred Compensation Agreement (incorporated by
reference to Registrant's Pre-Effective Amendment No. 2, April 27, 1992).

         8.  Custodial Contract (incorporated by reference to Registrant's
Pre-Effective Amendment No. 2, April 27, 1992).

         9.a.  Transfer Agency Contract and Shareholder Servicing Contract,
(incorporated by reference to Registrant's Post-Effective Amendment No. 15,
filed April 30, 1998).

         9.b.  Administrative Services Agreement (incorporated by reference
to Registrant's Pre-Effective Amendment No. 2, April 27, 1992).

         10.  Opinion and Consent of Counsel as to Legality of Shares Being
Registered (filed herewith).

         15.  Plan of Distribution for Class A Shares, incorporated by
reference to Registrant's Post-Effective Amendment No. 13, January 25, 1996;
for Class B and C Shares, (incorporated by reference to Registrant's
Post-Effective Amendment No. 15, filed April 30, 1998).

         17.  Rule 414 Statement of Successor Entity (incorporated by
reference to Registrant's Pre-Effective Amendment No. 3, May 21, 1992).

         (ii)  Multiple-class Plan pursuant to Investment Company Act of
1940 Rule 18f-3, (incorporated by reference to Registrant's Post-Effective
Amendment No. 15, filed April 30, 1998).


Item 24. Persons Controlled By or Under Common Control With Registrant

         Not applicable.


Item 25. Indemnification

         Registrant's Bylaws, Exhibit 2 to this Registration Statement,
provide that officers and directors will be indemnified by the Fund against
liabilities and expenses incurred by such persons in connection with
actions, suits, or proceedings arising out of their offices or duties of
employment, except that no indemnification can be made to a person who has
been adjudged liable of willful misfeasance, bad faith, gross negligence, or
reckless disregard of duties. In the absence of such an adjudication, the
determination of eligibility for indemnification shall be made by
independent counsel in a written opinion or by the vote of a majority of a
quorum of directors who are neither "interested persons" of Registrant, as
that term is defined in Section 2(a)(19) of the Investment Company Act of
1940, nor parties to the proceeding.

         Registrant's Articles of Incorporation also provides that
Registrant may purchase and maintain liability insurance on behalf of any
officer, trustee, employee or agent against any liabilities arising from
such status. In this regard, Registrant maintains a Directors & Officers
(Partners) Liability Insurance Policy with Chubb Group of Insurance
Companies, 15 Mountain View Road, Warren, New Jersey 07061, providing
Registrant with $5 million in directors and officers liability coverage,
plus $5 million in excess directors and officers liability coverage for the
independent trustees/directors only. Registrant also maintains an $8 million
Investment Company Blanket Bond issued by ICI Mutual Insurance Company, P.O.
Box 730, Burlington, Vermont, 05402.


Item 26. Business and Other Connections of Investment Adviser

                           Name of Company, Principal
Name                       Business and Address                   Capacity


Barbara J. Krumsiek        Calvert Variable Series, Inc.          Officer
                           Calvert Municipal Fund, Inc.            and
                           Calvert World Values Fund, Inc.        Director

                           Investment Companies
                           4550 Montgomery Avenue
                           Bethesda, Maryland 20814
                           ----------------
                           First Variable Rate Fund for           Officer
                            Government Income                      and
                           Calvert Tax-Free Reserves              Trustee
                           Calvert Social Investment Fund
                           Calvert Cash Reserves
                           The Calvert Fund

                           Investment Companies
                           4550 Montgomery Avenue
                           Bethesda, Maryland 20814
                           ----------------
                           Calvert Asset Management Co., Inc.     Officer
                           Investment Advisor                      and
                           4550 Montgomery Avenue                 Director
                           Bethesda, Maryland 20814
                           ----------------
                           Calvert Group, Ltd.                    Officer
                           Holding Company                         and
                           4550 Montgomery Avenue                 Director
                           Bethesda, Maryland 20814
                           ----------------
                           Calvert Shareholder Services, Inc.     Officer
                           Transfer Agent                          and
                           4550 Montgomery Avenue                 Director
                           Bethesda, Maryland 20814
                           ---------------
                           Calvert Administrative Services Co.    Officer
                           Service Company                        and
                           4550 Montgomery Avenue                 Director
                           Bethesda, Maryland 20814
                           ---------------
                           Calvert Distributors, Inc.             Officer
                           Broker-Dealer                           and
                           4550 Montgomery Avenue                 Director
                           Bethesda, Maryland 20814
                           ---------------
                           Calvert-Sloan Advisers, LLC            Director
                           Investment Advisor
                           4550 Montgomery Avenue
                           Bethesda, Maryland 20814
                           ---------------
                           Calvert New World Fund, Inc.           Director
                           Investment Company
                           4550 Montgomery Avenue
                           Bethesda, Maryland 20814
                           --------------
                           Alliance Capital Mgmt. L.P.      Sr. Vice President
                           Mutual Fund Division                   Director
                           1345 Avenue of the Americas
                           New York, NY 10105
                           --------------

Ronald M. Wolfsheimer      First Variable Rate Fund               Officer
                            for Government Income
                           Calvert Tax-Free Reserves
                           Calvert Cash Reserves
                           Calvert Social Investment Fund
                           The Calvert Fund
                           Calvert Variable Series, Inc.
                           Calvert Municipal Fund, Inc.
                           Calvert World Values Fund, Inc.
                           Calvert New World Fund, Inc.

                           Investment Companies
                           4550 Montgomery Avenue
                           Bethesda, Maryland 20814
                           --------------
                           Calvert Asset Management Co., Inc.     Officer
                           Investment Advisor
                           4550 Montgomery Avenue
                           Bethesda, Maryland 20814
                           ---------------
                           Calvert Group, Ltd.                    Officer
                           Holding Company
                           4550 Montgomery Avenue
                           Bethesda, Maryland 20814
                           ---------------
                           Calvert Shareholder Services, Inc.     Officer
                           Transfer Agent
                           4550 Montgomery Avenue
                           Bethesda, Maryland 20814
                           ---------------
                           Calvert Administrative Services Co.    Officer
                           Service Company                         and
                           4550 Montgomery Avenue                 Director
                           Bethesda, Maryland 20814
                           ---------------
                           Calvert Distributors, Inc.             Officer
                           Broker-Dealer                           and
                           4550 Montgomery Avenue                 Director
                           Bethesda, Maryland 20814
                           ---------------
                           Calvert-Sloan Advisers, LLC            Officer
                           Investment Advisor
                           4550 Montgomery Avenue
                           Bethesda, Maryland 20814
                           ---------------

David R. Rochat            First Variable Rate Fund               Officer
                            for Government Income                  and
                           Calvert Tax-Free Reserves              Trustee
                           Calvert Cash Reserves
                           The Calvert Fund

                           Investment Companies
                           4550 Montgomery Avenue
                           Bethesda, Maryland 20814
                           ---------------
                           Calvert Municipal Fund, Inc.           Officer
                           Investment Company                      and
                           4550 Montgomery Avenue                 Director
                           Bethesda, Maryland 20814
                           ---------------
                           Calvert Asset Management Co., Inc.     Officer
                           Investment Advisor                      and
                           4550 Montgomery Avenue                 Director
                           Bethesda, Maryland 20814
                           ---------------
                           Chelsea Securities, Inc.               Officer
                           Securities Firm                         and
                           Post Office Box 93                     Director
                           Chelsea, Vermont 05038
                           ---------------
                           Grady, Berwald & Co.                   Officer
                           Holding Company                         and
                           43A South Finley Avenue                Director
                           Basking Ridge, NJ 07920
                           ---------------

Reno J. Martini            Calvert Asset Management Co., Inc.     Officer
                           Investment Advisor
                           4550 Montgomery Avenue
                           Bethesda, Maryland 20814
                           ---------------
                           Calvert Group, Ltd.                    Officer
                           Holding Company
                           4550 Montgomery Avenue
                           Bethesda, Maryland 20814
                           ---------------
                           First Variable Rate Fund               Officer
                            for Government Income
                           Calvert Tax-Free Reserves
                           Calvert Cash Reserves
                           Calvert Social Investment Fund
                           The Calvert Fund
                           Calvert Variable Series, Inc.
                           Calvert Municipal Fund, Inc.
                           Calvert World Values Fund, Inc.

                           Investment Companies
                           4550 Montgomery Avenue
                           Bethesda, Maryland 20814
                           ---------------
                           Calvert New World Fund, Inc.           Director
                           Investment Company                      and
                           4550 Montgomery Avenue                 Officer
                           Bethesda, Maryland 20814
                           ---------------
                           Calvert-Sloan Advisers, LLC            Director
                           Investment Advisor                      and
                           4550 Montgomery Avenue                 Officer
                           Bethesda, Maryland 20814
                           ---------------

Charles T. Nason           Ameritas Acacia Mutual Holding Co.     Officer
                           Acacia National Life Insurance         and
Director

                           Insurance Companies
                           7315 Wisconsin Avenue
                           Bethesda, Maryland 20814
                           ---------------
                           Acacia Financial Corporation           Officer
                           Holding Company                         and
                           7315 Wisconsin Avenue                  Director
                           Bethesda, Maryland 20814
                           ---------------
                           Acacia Federal Savings Bank            Director
                           Savings Bank
                           7600-B Leesburg Pike
                           Falls Church, Virginia 22043
                           ---------------
                           Enterprise Resources, Inc.             Director
                           Business Support Services
                           7315 Wisconsin Avenue
                           Bethesda, Maryland 20814
                           ---------------
                           Acacia Realty Square, L.L.C.           Director
                           Realty Investments
                           7315 Wisconsin Avenue
                           Bethesda, Maryland 20814
                           ---------------
                           Gardner Montgomery Company             Director
                           Tax Return Preparation Services
                           7315 Wisconsin Avenue
                           Bethesda, Maryland 20814
                           ---------------
                           Calvert Group, Ltd.                    Director
                           Holding Company
                           4550 Montgomery Avenue
                           Bethesda, Maryland 20814
                           ---------------
                           Calvert Administrative Services Co.    Director
                           Service Company
                           4550 Montgomery Avenue
                           Bethesda, Maryland 20814
                           ---------------
                           Calvert Asset Management Co., Inc.     Director
                           Investment Advisor
                           4550 Montgomery Avenue
                           Bethesda, Maryland 20814
                           ---------------
                           Calvert Shareholder Services, Inc.     Director
                           Transfer Agent
                           4550 Montgomery Avenue
                           Bethesda, Maryland 20814
                           ---------------
                           Calvert Social Investment Fund         Trustee
                           Investment Company
                           4550 Montgomery Avenue
                           Bethesda, Maryland 20814
                           -----------------
                           The Advisors Group, Inc.               Director
                           Broker-Dealer and
                           Investment Advisor
                           7315 Wisconsin Avenue
                           Bethesda, Maryland 20814
                           ---------------

Robert-John H.             Acacia National Life Insurance         Officer
 Sands                     Insurance Company                       and
                           7315 Wisconsin Avenue                  Director
                           Bethesda, Maryland 20814
                           ----------------
                           Ameritas Acacia Mutual Holding Co.     Officer
                           Insurance Company
                           7315 Wisconsin Avenue
                           Bethesda, Maryland 20814
                           ----------------
                           Acacia Financial Corporation           Officer
                           Holding Company                         and
                           7315 Wisconsin Avenue                  Director
                           Bethesda, Maryland 20814
                           ----------------
                           Acacia Federal Savings Bank            Officer
                           Savings Bank
                           7600-B Leesburg Pike
                           Falls Church, Virginia 22043
                           ---------------
                           Enterprise Resources, Inc.             Director
                           Business Support Services
                           7315 Wisconsin Avenue
                           Bethesda, Maryland 20814
                           ---------------
                           Acacia Realty Square, L.L.C.           Director
                           Realty Investments
                           7315 Wisconsin Avenue
                           Bethesda, Maryland 20814
                           ---------------
                           The Advisors Group, Inc.               Director
                           Broker-Dealer and
                           Investment Advisor
                           7315 Wisconsin Avenue
                           Bethesda, Maryland 20814
                           ---------------
                           Gardner Montgomery Company             Director
                           Tax Return Preparation Services
                           7315 Wisconsin Avenue
                           Bethesda, Maryland 20814
                           ---------------
                           Calvert Group, Ltd.                    Director
                           Holding Company
                           4550 Montgomery Avenue
                           Bethesda, Maryland 20814
                           ---------------
                           Calvert Administrative Services Co.    Director
                           Service Company
                           4550 Montgomery Avenue
                           Bethesda, Maryland 20814
                           ---------------
                           Calvert Asset Management, Co., Inc.    Director
                           Investment Advisor
                           4550 Montgomery Avenue
                           Bethesda, Maryland 20814
                           ---------------
                           Calvert Shareholder Services, Inc.     Director
                           Transfer Agent
                           4550 Montgomery Avenue
                           Bethesda, Maryland 20814
                           ---------------

William M. Tartikoff       Acacia National Life Insurance         Officer
                           Insurance Company
                           7315 Wisconsin Avenue
                           Bethesda, Maryland 20814
                           ----------------
                           First Variable Rate Fund for           Officer
                            Government Income
                           Calvert Tax-Free Reserves
                           Calvert Cash Reserves
                           Calvert Social Investment Fund
                           The Calvert Fund
                           Calvert Variable Series, Inc.
                           Calvert Municipal Fund, Inc.
                           Calvert World Values Fund, Inc.
                           Calvert New World Fund, Inc.

                           Investment Companies
                           4550 Montgomery Avenue
                           Bethesda, Maryland 20814
                           ---------------
                           Calvert Group, Ltd.                    Officer
                           Holding Company
                           4550 Montgomery Avenue
                           Bethesda, Maryland 20814
                           ---------------
                           Calvert Administrative                 Officer
                           Services Company
                           Service Company
                           4550 Montgomery Avenue
                           Bethesda, Maryland 20814
                           ---------------
                           Calvert Asset Management Co. Inc.      Officer
                           Investment Advisor
                           4550 Montgomery Avenue
                           Bethesda, Maryland 20814
                           ----------------
                           Calvert Shareholder Services, Inc.     Officer
                           Transfer Agent
                           4550 Montgomery Avenue
                           Bethesda, Maryland 20814
                           ----------------
                           Calvert Distributors, Inc.             Director
                           Broker-Dealer                           and
                           4550 Montgomery Avenue                 Officer
                           Bethesda, Maryland 20814
                           ----------------
                           Calvert-Sloan Advisers, LLC            Officer
                           Investment Advisor
                           4550 Montgomery Avenue
                           Bethesda, Maryland 20814
                           ----------------

Susan Walker Bender        Calvert Group, Ltd.                    Officer
                           Holding Company
                           4550 Montgomery Avenue
                           Bethesda, Maryland 20814
                           ---------------
                           Calvert Administrative Services Co.    Officer
                           Service Company
                           4550 Montgomery Avenue
                           Bethesda, Maryland 20814
                           ---------------
                           Calvert Asset Management Co., Inc.     Officer
                           Investment Advisor
                           4550 Montgomery Avenue
                           Bethesda, Maryland 20814
                           ----------------
                           Calvert Shareholder Services, Inc.     Officer
                           Transfer Agent
                           4550 Montgomery Avenue
                           Bethesda, Maryland 20814
                           ----------------
                           Calvert Distributors, Inc.             Officer
                           Broker-Dealer
                           4550 Montgomery Avenue
                           Bethesda, Maryland 20814
                           ----------------
                           Calvert-Sloan Advisers, LLC            Officer
                           Investment Advisor
                           4550 Montgomery Avenue
                           Bethesda, Maryland 20814
                           ----------------
                           First Variable Rate Fund for           Officer
                            Government Income
                           Calvert Tax-Free Reserves
                           Calvert Cash Reserves
                           Calvert Social Investment Fund
                           The Calvert Fund
                           Calvert Variable Series, Inc.
                           Calvert Municipal Fund, Inc.
                           Calvert World Values Fund, Inc.
                           Calvert New World Fund, Inc.

                           Investment Companies
                           4550 Montgomery Avenue
                           Bethesda, Maryland 20814
                           ---------------

Katherine Stoner           Calvert Group, Ltd.                    Officer
                           Holding Company
                           4550 Montgomery Avenue
                           Bethesda, Maryland 20814
                           ---------------
                           Calvert Administrative Services Co.    Officer
                           Service Company
                           4550 Montgomery Avenue
                           Bethesda, Maryland 20814
                           ---------------
                           Calvert Asset Management Co., Inc.     Officer
                           Investment Advisor
                           4550 Montgomery Avenue
                           Bethesda, Maryland 20814
                           ----------------
                           Calvert Shareholder Services, Inc.     Officer
                           Transfer Agent
                           4550 Montgomery Avenue
                           Bethesda, Maryland 20814
                           ----------------
                           Calvert Distributors, Inc.             Officer
                           Broker-Dealer
                           4550 Montgomery Avenue
                           Bethesda, Maryland 20814
                           ----------------
                           Calvert-Sloan Advisers, LLC            Officer
                           Investment Advisor
                           4550 Montgomery Avenue
                           Bethesda, Maryland 20814
                           ----------------
                           First Variable Rate Fund for           Officer
                            Government Income
                           Calvert Tax-Free Reserves
                           Calvert Cash Reserves
                           Calvert Social Investment Fund
                           The Calvert Fund
                           Calvert Variable Series, Inc.
                           Calvert Municipal Fund, Inc.
                           Calvert World Values Fund, Inc.
                           Calvert New World Fund, Inc.

                           Investment Companies
                           4550 Montgomery Avenue
                           Bethesda, Maryland 20814
                           ---------------

Ivy Wafford Duke           Calvert Group, Ltd.                    Officer
                           Holding Company
                           4550 Montgomery Avenue
                           Bethesda, Maryland 20814
                           ---------------
                           Calvert Administrative Services Co.    Officer
                           Service Company
                           4550 Montgomery Avenue
                           Bethesda, Maryland 20814
                           ---------------
                           Calvert Asset Management Co., Inc.     Officer
                           Investment Advisor
                           4550 Montgomery Avenue
                           Bethesda, Maryland 20814
                           ----------------
                           Calvert Shareholder Services, Inc.     Officer
                           Transfer Agent
                           4550 Montgomery Avenue
                           Bethesda, Maryland 20814
                           ----------------
                           Calvert Distributors, Inc.             Officer
                           Broker-Dealer
                           4550 Montgomery Avenue
                           Bethesda, Maryland 20814
                           ----------------
                           Calvert-Sloan Advisers, LLC            Officer
                           Investment Advisor
                           4550 Montgomery Avenue
                           Bethesda, Maryland 20814
                           ----------------
                           First Variable Rate Fund for           Officer
                            Government Income
                           Calvert Tax-Free Reserves
                           Calvert Cash Reserves
                           Calvert Social Investment Fund
                           The Calvert Fund
                           Calvert Variable Series, Inc.
                           Calvert Municipal Fund, Inc.
                           Calvert World Values Fund, Inc.
                           Calvert New World Fund, Inc.

                           Investment Companies
                           4550 Montgomery Avenue
                           Bethesda, Maryland 20814
                           ---------------

Victor Frye                Calvert Group, Ltd.                    Officer
                           Holding Company
                           4550 Montgomery Avenue
                           Bethesda, Maryland 20814
                           ---------------
                           Calvert Administrative Services Co.    Officer
                           Service Company
                           4550 Montgomery Avenue
                           Bethesda, Maryland 20814
                           ---------------
                           Calvert Asset Management Co., Inc.     Officer
                           Investment Advisor
                           4550 Montgomery Avenue
                           Bethesda, Maryland 20814
                           ----------------
                           Calvert Shareholder Services, Inc.     Officer
                           Transfer Agent
                           4550 Montgomery Avenue
                           Bethesda, Maryland 20814
                           ----------------
                           Calvert Distributors, Inc.             Officer
                           Broker-Dealer
                           4550 Montgomery Avenue
                           Bethesda, Maryland 20814
                           ----------------
                           The Advisors Group, Inc.               Counsel
                           Broker-Dealer and                      and
                           Investment Advisor                     Compliance
                           7315 Wisconsin Avenue                  Manager
                           Bethesda, Maryland 20814
                           ---------------

Daniel K. Hayes            Calvert Asset Management Co., Inc.     Officer
                           Investment Advisor
                           4550 Montgomery Avenue
                           Bethesda, Maryland 20814
                           ------------------
                           First Variable Rate Fund for           Officer
                            Government Income
                           Calvert Tax-Free Reserves
                           Calvert Cash Reserves
                           Calvert Social Investment Fund
                           The Calvert Fund
                           Calvert Variable Series, Inc.
                           Calvert Municipal Fund, Inc.
                           Calvert World Values Fund, Inc.

                           Investment Companies
                           4550 Montgomery Avenue
                           Bethesda, Maryland 20814
                           ------------------

Steve Van Order            Calvert Asset Management               Officer
                           Company, Inc.
                           Investment Advisor
                           4550 Montgomery Avenue
                           Bethesda, Maryland 20814
                           ------------------

John Nichols               Calvert Asset Management               Officer
                           Company, Inc.
                           Investment Advisor
                           4550 Montgomery Avenue
                           Bethesda, Maryland 20814
                           ------------------

David Leach                Calvert Asset Management               Officer
                           Company, Inc.
                           Investment Advisor
                           4550 Montgomery Avenue
                           Bethesda, Maryland 20814
                           ------------------

Matthew D. Gelfand         Calvert Asset Management               Officer
                           Company, Inc.
                           Investment Advisor
                           4550 Montgomery Avenue
                           Bethesda, Maryland 20814
                           ------------------
                           Strategic Investment Management        Officer
                           Investment Advisor
                           1001 19th Street North
                           Arlington, Virginia 20009
                           ------------------

Item 27. Principal Underwriters

         (a)      Registrant's principal underwriter underwrites shares of
First Variable Rate Fund for Government Income, Calvert Tax-Free Reserves,
Calvert Social Investment Fund, Calvert Cash Reserves, The Calvert Fund,
Calvert Municipal Fund, Inc., Calvert World Values Fund, Inc., Calvert New
World Fund, Inc., and Calvert Variable Series, Inc. (formerly named Acacia
Capital Corporation).

         (b)      Positions of Underwriter's Officers and Directors

Name and Principal         Position(s) with               Position(s) with
Business Address           Underwriter                    Registrant

Barbara J. Krumsiek        Director and President         President and
Trustee

Ronald M. Wolfsheimer      Director, Senior Vice          Treasurer
                           President and Chief Financial Officer

William M. Tartikoff       Director, Senior Vice          Vice President and
                           President and Secretary        Secretary

Craig Cloyed               Senior Vice President          None

Karen Becker               Vice President, Operations     None

Steve Cohen                Vice President                 None

Geoffrey Ashton            Regional Vice President        None

Martin Brown               Regional Vice President        None

Bill Hairgrove             Regional Vice President        None

Janet Haley                Regional Vice President        None

Steve Himber               Regional Vice President        None

Ben Ogbogu                 Regional Vice President        None

Tom Stanton                Regional Vice President        None

Christine Teske            Regional Vice President        None

Susan Walker Bender        Assistant Secretary            Assistant Secretary

Katherine Stoner           Assistant Secretary            Assistant Secretary

Ivy Wafford Duke           Assistant Secretary            Assistant Secretary

Victor Frye                Assistant Secretary            None
                           and Compliance Officer

         (c)      Inapplicable.


Item 28. Location of Accounts and Records

         Ronald M. Wolfsheimer, Treasurer
         and
         William M. Tartikoff, Secretary
 
         4550 Montgomery Avenue, Suite 1000N
         Bethesda, Maryland 20814


Item 29. Management Services

         Not Applicable

Item 30. Undertakings

         Not Applicable

         SIGNATURES

Pursuant to the requirements of the Securities Act of 1933 and the
Investment Company Act of 1940, the Registrant certifies that it has duly
caused this registration statement to be signed on its behalf by the
undersigned, duly authorized, in the City of Bethesda, and State of
Maryland, on the 1st day of March, 1999.


CALVERT MUNICIPAL FUND, INC.

By:
_______________**__________________
Barbara J. Krumsiek
President and Director

SIGNATURES

Pursuant to the requirements of the Securities Act of 1933, this
Registration Statement has been signed below by the following persons in the
capacities indicated.


Signature                           Title                     Date


__________**____________            President and             3/1/99
Barbara J. Krumsiek                 Trustee (Principal Executive Officer)


__________**____________            Principal Accounting      3/1/99
Ronald M. Wolfsheimer               Officer


__________**____________            Trustee                   3/1/99
Richard L. Baird, Jr.


__________**____________            Trustee                   3/1/99
Frank H. Blatz, Jr., Esq.


__________**____________            Trustee                   3/1/99
Frederick T. Borts, M.D.


__________**____________            Trustee                   3/1/99
Charles E. Diehl


__________**____________            Trustee                   3/1/99
Douglas E. Feldman


__________**____________            Trustee                   3/1/99
Peter W. Gavian


__________**____________            Trustee                   3/1/99
John G. Guffey, Jr.


__________**____________            Trustee                   3/1/99
M. Charito Kruvant


__________**____________            Trustee                   3/1/99
Arthur J. Pugh


__________**____________            Trustee                   3/1/99
David R. Rochat


__________**____________            Trustee                   3/1/99
D. Wayne Silby


**By Katherine Stoner as Attorney-in-fact, pursuant to Power of Attorney
Forms on file.







Exhibit 10


March 1, 1999

Securities and Exchange Commission
Judiciary Plaza
450 Fifth Street, N.W.
Washington, D.C.  20549


         Re:      Exhibit 10, Form N-1A
                  Calvert Municipal Fund, Inc.
                  File Numbers 811-6525 and 33-44968


Ladies and Gentlemen:


As counsel to Calvert Group, Ltd., it is my opinion that the securities
being registered by this Post-Effective Amendment No. 16 will be legally
issued, fully paid and non-assessable when sold.  My opinion is based on an
examination of documents related to Calvert Municipal Fund, Inc. (the
"Fund"), including its Articles of Incorporation, other original or
photostatic copies of Fund records, certificates of public officials,
documents, papers, statutes, or authorities as I deemed necessary to form
the basis of this opinion.

I therefore consent to filing this opinion of counsel with the Securities
and Exchange Commission as an Exhibit to the Fund's Post-Effective Amendment
No. 16 to its Registration Statement.

Sincerely,

/s/ Katherine Stoner

Katherine Stoner
Associate General Counsel





                               POWER OF ATTORNEY


         I, the undersigned Trustee/Director of First Variable Rate Fund for
Government Income, Calvert Tax-Free Reserves, Calvert Cash Reserves, The
Calvert Fund, and Calvert Municipal Fund, Inc. (collectively, the "Funds"),
hereby constitute Ronald M. Wolfsheimer, William M. Tartikoff, Susan Walker
Bender, Katherine Stoner, Lisa Crossley, and Ivy Wafford Duke my true and
lawful attorneys, with full power to each of them, to sign for me and in my
name in the appropriate capacities, all registration statements and amendments
filed by the Funds with any federal or state agency, and to do all such things
in my name and behalf necessary for registering and maintaining registration
or exemptions from registration of the Funds with any government agency in any
jurisdiction, domestic or foreign.

         The same persons are authorized generally to do all such things in my
name and behalf to comply with the provisions of all federal, state and
foreign laws, regulations, and policy pronouncements affecting the Funds,
including, but not limited to, the Securities Act of 1933, the Securities
Exchange Act of 1934, the Investment Company Act of 1940, the Investment
Advisers Act of 1940, and all state laws regulating the securities industry.

         The same persons are further authorized to sign my name to any
document needed to maintain the lawful operation of the Funds in connection
with any transaction approved by the Board of Trustee/Directors.

         When any of the above-referenced attorneys signs my name to any
document in connection with maintaining the lawful operation of the Funds, the
signing is automatically ratified and confirmed by me by virtue of this Power
of Attorney.

         WITNESS my hand on the date set forth below.


May 7, 1997
Date                                        /Signature/

Edwidge Saint-Felix                         Barbara Krumsiek
Witness                                     Name of Trustee/Director


<PAGE>


                               POWER OF ATTORNEY


         I, the undersigned Trustee/Director of First Variable Rate Fund for
Government Income, Calvert Tax-Free Reserves, Calvert Cash Reserves, The
Calvert Fund, and Calvert Municipal Fund, Inc. (collectively, the "Funds"),
hereby constitute Ronald M. Wolfsheimer, William M. Tartikoff, Susan Walker
Bender, Katherine Stoner, Lisa Crossley, and Ivy Wafford Duke my true and
lawful attorneys, with full power to each of them, to sign for me and in my
name in the appropriate capacities, all registration statements and amendments
filed by the Funds with any federal or state agency, and to do all such things
in my name and behalf necessary for registering and maintaining registration
or exemptions from registration of the Funds with any government agency in any
jurisdiction, domestic or foreign.

         The same persons are authorized generally to do all such things in my
name and behalf to comply with the provisions of all federal, state and
foreign laws, regulations, and policy pronouncements affecting the Funds,
including, but not limited to, the Securities Act of 1933, the Securities
Exchange Act of 1934, the Investment Company Act of 1940, the Investment
Advisers Act of 1940, and all state laws regulating the securities industry.

         The same persons are further authorized to sign my name to any
document needed to maintain the lawful operation of the Funds in connection
with any transaction approved by the Board of Trustee/Directors.

         When any of the above-referenced attorneys signs my name to any
document in connection with maintaining the lawful operation of the Funds, the
signing is automatically ratified and confirmed by me by virtue of this Power
of Attorney.

         WITNESS my hand on the date set forth below.

May 7, 1997
Date                                        /Signature/

Edwidge Saint-Felix                         Richard L. Baird, Jr.
Witness                                     Name of Trustee/Director


<PAGE>



                               POWER OF ATTORNEY


         I, the undersigned Trustee/Director of First Variable Rate Fund for
Government Income, Calvert Tax-Free Reserves, Calvert Cash Reserves, The
Calvert Fund, and Calvert Municipal Fund, Inc. (collectively, the "Funds"),
hereby constitute Ronald M. Wolfsheimer, William M. Tartikoff, Susan Walker
Bender, Katherine Stoner, Lisa Crossley, and Ivy Wafford Duke my true and
lawful attorneys, with full power to each of them, to sign for me and in my
name in the appropriate capacities, all registration statements and amendments
filed by the Funds with any federal or state agency, and to do all such things
in my name and behalf necessary for registering and maintaining registration
or exemptions from registration of the Funds with any government agency in any
jurisdiction, domestic or foreign.

         The same persons are authorized generally to do all such things in my
name and behalf to comply with the provisions of all federal, state and
foreign laws, regulations, and policy pronouncements affecting the Funds,
including, but not limited to, the Securities Act of 1933, the Securities
Exchange Act of 1934, the Investment Company Act of 1940, the Investment
Advisers Act of 1940, and all state laws regulating the securities industry.

         The same persons are further authorized to sign my name to any
document needed to maintain the lawful operation of the Funds in connection
with any transaction approved by the Board of Trustee/Directors.

         When any of the above-referenced attorneys signs my name to any
document in connection with maintaining the lawful operation of the Funds, the
signing is automatically ratified and confirmed by me by virtue of this Power
of Attorney.

         WITNESS my hand on the date set forth below.

May 7, 1997
Date                                        /Signature/

Charles E. Diehl                            Frank H. Blatz, Jr.
Witness                                     Name of Trustee/Director


<PAGE>


                               POWER OF ATTORNEY


         I, the undersigned Trustee/Director of First Variable Rate Fund for
Government Income, Calvert Tax-Free Reserves, Calvert Cash Reserves, The
Calvert Fund, and Calvert Municipal Fund, Inc. (collectively, the "Funds"),
hereby constitute Ronald M. Wolfsheimer, William M. Tartikoff, Susan Walker
Bender, Katherine Stoner, Lisa Crossley, and Ivy Wafford Duke my true and
lawful attorneys, with full power to each of them, to sign for me and in my
name in the appropriate capacities, all registration statements and amendments
filed by the Funds with any federal or state agency, and to do all such things
in my name and behalf necessary for registering and maintaining registration
or exemptions from registration of the Funds with any government agency in any
jurisdiction, domestic or foreign.

         The same persons are authorized generally to do all such things in my
name and behalf to comply with the provisions of all federal, state and
foreign laws, regulations, and policy pronouncements affecting the Funds,
including, but not limited to, the Securities Act of 1933, the Securities
Exchange Act of 1934, the Investment Company Act of 1940, the Investment
Advisers Act of 1940, and all state laws regulating the securities industry.

         The same persons are further authorized to sign my name to any
document needed to maintain the lawful operation of the Funds in connection
with any transaction approved by the Board of Trustee/Directors.

         When any of the above-referenced attorneys signs my name to any
document in connection with maintaining the lawful operation of the Funds, the
signing is automatically ratified and confirmed by me by virtue of this Power
of Attorney.

         WITNESS my hand on the date set forth below.

May 7, 1997
Date                                        /Signature/

Edwidge Saint-Felix                         Douglas E. Feldman
Witness                                     Name of Trustee/Director


<PAGE>

                               POWER OF ATTORNEY


         I, the undersigned Trustee/Director of First Variable Rate Fund for
Government Income, Calvert Tax-Free Reserves, Calvert Cash Reserves, The
Calvert Fund, and Calvert Municipal Fund, Inc. (collectively, the "Funds"),
hereby constitute Ronald M. Wolfsheimer, William M. Tartikoff, Susan Walker
Bender, Katherine Stoner, Lisa Crossley, and Ivy Wafford Duke my true and
lawful attorneys, with full power to each of them, to sign for me and in my
name in the appropriate capacities, all registration statements and amendments
filed by the Funds with any federal or state agency, and to do all such things
in my name and behalf necessary for registering and maintaining registration
or exemptions from registration of the Funds with any government agency in any
jurisdiction, domestic or foreign.

         The same persons are authorized generally to do all such things in my
name and behalf to comply with the provisions of all federal, state and
foreign laws, regulations, and policy pronouncements affecting the Funds,
including, but not limited to, the Securities Act of 1933, the Securities
Exchange Act of 1934, the Investment Company Act of 1940, the Investment
Advisers Act of 1940, and all state laws regulating the securities industry.

         The same persons are further authorized to sign my name to any
document needed to maintain the lawful operation of the Funds in connection
with any transaction approved by the Board of Trustee/Directors.

         When any of the above-referenced attorneys signs my name to any
document in connection with maintaining the lawful operation of the Funds, the
signing is automatically ratified and confirmed by me by virtue of this Power
of Attorney.

         WITNESS my hand on the date set forth below.

May 7, 1997
Date                                        /Signature/

Frank H. Blatz, Jr.                         Charles E. Diehl
Witness                                     Name of Trustee/Director


<PAGE>


                               POWER OF ATTORNEY


         I, the undersigned Trustee/Director of First Variable Rate Fund for
Government Income, Calvert Tax-Free Reserves, Calvert Cash Reserves, The
Calvert Fund, and Calvert Municipal Fund, Inc. (collectively, the "Funds"),
hereby constitute Ronald M. Wolfsheimer, William M. Tartikoff, Susan Walker
Bender, Katherine Stoner, Lisa Crossley, and Ivy Wafford Duke my true and
lawful attorneys, with full power to each of them, to sign for me and in my
name in the appropriate capacities, all registration statements and amendments
filed by the Funds with any federal or state agency, and to do all such things
in my name and behalf necessary for registering and maintaining registration
or exemptions from registration of the Funds with any government agency in any
jurisdiction, domestic or foreign.

         The same persons are authorized generally to do all such things in my
name and behalf to comply with the provisions of all federal, state and
foreign laws, regulations, and policy pronouncements affecting the Funds,
including, but not limited to, the Securities Act of 1933, the Securities
Exchange Act of 1934, the Investment Company Act of 1940, the Investment
Advisers Act of 1940, and all state laws regulating the securities industry.

         The same persons are further authorized to sign my name to any
document needed to maintain the lawful operation of the Funds in connection
with any transaction approved by the Board of Trustee/Directors.

         When any of the above-referenced attorneys signs my name to any
document in connection with maintaining the lawful operation of the Funds, the
signing is automatically ratified and confirmed by me by virtue of this Power
of Attorney.

         WITNESS my hand on the date set forth below.

May 7, 1997
Date                                        /Signature/

Edwidge Saint-Felix                         Peter W. Gavian
Witness                                     Name of Trustee/Director


<PAGE>



                               POWER OF ATTORNEY


         I, the undersigned Trustee/Director of First Variable Rate Fund for
Government Income, Calvert Tax-Free Reserves, Calvert Cash Reserves, The
Calvert Fund, and Calvert Municipal Fund, Inc. (collectively, the "Funds"),
hereby constitute Ronald M. Wolfsheimer, William M. Tartikoff, Susan Walker
Bender, Katherine Stoner, Lisa Crossley, and Ivy Wafford Duke my true and
lawful attorneys, with full power to each of them, to sign for me and in my
name in the appropriate capacities, all registration statements and amendments
filed by the Funds with any federal or state agency, and to do all such things
in my name and behalf necessary for registering and maintaining registration
or exemptions from registration of the Funds with any government agency in any
jurisdiction, domestic or foreign.

         The same persons are authorized generally to do all such things in my
name and behalf to comply with the provisions of all federal, state and
foreign laws, regulations, and policy pronouncements affecting the Funds,
including, but not limited to, the Securities Act of 1933, the Securities
Exchange Act of 1934, the Investment Company Act of 1940, the Investment
Advisers Act of 1940, and all state laws regulating the securities industry.

         The same persons are further authorized to sign my name to any
document needed to maintain the lawful operation of the Funds in connection
with any transaction approved by the Board of Trustee/Directors.

         When any of the above-referenced attorneys signs my name to any
document in connection with maintaining the lawful operation of the Funds, the
signing is automatically ratified and confirmed by me by virtue of this Power
of Attorney.

         WITNESS my hand on the date set forth below.

May 7, 1997
Date                                        /Signature/

M. Charito Kruvant                          John G. Guffey, Jr.
Witness                                     Name of Trustee/Director


<PAGE>



                               POWER OF ATTORNEY


         I, the undersigned Trustee/Director of First Variable Rate Fund for
Government Income, Calvert Tax-Free Reserves, Calvert Cash Reserves, The
Calvert Fund, and Calvert Municipal Fund, Inc. (collectively, the "Funds"),
hereby constitute Ronald M. Wolfsheimer, William M. Tartikoff, Susan Walker
Bender, Katherine Stoner, Lisa Crossley, and Ivy Wafford Duke my true and
lawful attorneys, with full power to each of them, to sign for me and in my
name in the appropriate capacities, all registration statements and amendments
filed by the Funds with any federal or state agency, and to do all such things
in my name and behalf necessary for registering and maintaining registration
or exemptions from registration of the Funds with any government agency in any
jurisdiction, domestic or foreign.

         The same persons are authorized generally to do all such things in my
name and behalf to comply with the provisions of all federal, state and
foreign laws, regulations, and policy pronouncements affecting the Funds,
including, but not limited to, the Securities Act of 1933, the Securities
Exchange Act of 1934, the Investment Company Act of 1940, the Investment
Advisers Act of 1940, and all state laws regulating the securities industry.

         The same persons are further authorized to sign my name to any
document needed to maintain the lawful operation of the Funds in connection
with any transaction approved by the Board of Trustee/Directors.

         When any of the above-referenced attorneys signs my name to any
document in connection with maintaining the lawful operation of the Funds, the
signing is automatically ratified and confirmed by me by virtue of this Power
of Attorney.

         WITNESS my hand on the date set forth below.

May 7, 1997
Date                                        /Signature/

Edwidge Saint-Felix                         M. Charito Kruvant
Witness                                     Name of Trustee/Director


<PAGE>


                               POWER OF ATTORNEY


         I, the undersigned Trustee/Director of First Variable Rate Fund for
Government Income, Calvert Tax-Free Reserves, Calvert Cash Reserves, The
Calvert Fund, and Calvert Municipal Fund, Inc. (collectively, the "Funds"),
hereby constitute Ronald M. Wolfsheimer, William M. Tartikoff, Susan Walker
Bender, Katherine Stoner, Lisa Crossley, and Ivy Wafford Duke my true and
lawful attorneys, with full power to each of them, to sign for me and in my
name in the appropriate capacities, all registration statements and amendments
filed by the Funds with any federal or state agency, and to do all such things
in my name and behalf necessary for registering and maintaining registration
or exemptions from registration of the Funds with any government agency in any
jurisdiction, domestic or foreign.

         The same persons are authorized generally to do all such things in my
name and behalf to comply with the provisions of all federal, state and
foreign laws, regulations, and policy pronouncements affecting the Funds,
including, but not limited to, the Securities Act of 1933, the Securities
Exchange Act of 1934, the Investment Company Act of 1940, the Investment
Advisers Act of 1940, and all state laws regulating the securities industry.

         The same persons are further authorized to sign my name to any
document needed to maintain the lawful operation of the Funds in connection
with any transaction approved by the Board of Trustee/Directors.

         When any of the above-referenced attorneys signs my name to any
document in connection with maintaining the lawful operation of the Funds, the
signing is automatically ratified and confirmed by me by virtue of this Power
of Attorney.

         WITNESS my hand on the date set forth below.

May 7, 1997
Date                                        /Signature/

Charles E. Diehl                            Arthur J. Pugh
Witness                                     Name of Trustee/Director


<PAGE>


                               POWER OF ATTORNEY


         I, the undersigned Trustee/Director of First Variable Rate Fund for
Government Income, Calvert Tax-Free Reserves, Calvert Cash Reserves, The
Calvert Fund, and Calvert Municipal Fund, Inc. (collectively, the "Funds"),
hereby constitute Ronald M. Wolfsheimer, William M. Tartikoff, Susan Walker
Bender, Katherine Stoner, Lisa Crossley, and Ivy Wafford Duke my true and
lawful attorneys, with full power to each of them, to sign for me and in my
name in the appropriate capacities, all registration statements and amendments
filed by the Funds with any federal or state agency, and to do all such things
in my name and behalf necessary for registering and maintaining registration
or exemptions from registration of the Funds with any government agency in any
jurisdiction, domestic or foreign.

         The same persons are authorized generally to do all such things in my
name and behalf to comply with the provisions of all federal, state and
foreign laws, regulations, and policy pronouncements affecting the Funds,
including, but not limited to, the Securities Act of 1933, the Securities
Exchange Act of 1934, the Investment Company Act of 1940, the Investment
Advisers Act of 1940, and all state laws regulating the securities industry.

         The same persons are further authorized to sign my name to any
document needed to maintain the lawful operation of the Funds in connection
with any transaction approved by the Board of Trustee/Directors.

         When any of the above-referenced attorneys signs my name to any
document in connection with maintaining the lawful operation of the Funds, the
signing is automatically ratified and confirmed by me by virtue of this Power
of Attorney.

         WITNESS my hand on the date set forth below.


May 7, 1997
Date                                        /Signature/

Katherine Stoner                            David R. Rochat
Witness                                     Name of Trustee/Director


<PAGE>


                               POWER OF ATTORNEY


         I, the undersigned Trustee/Director of First Variable Rate Fund for
Government Income, Calvert Tax-Free Reserves, Calvert Cash Reserves, The
Calvert Fund, and Calvert Municipal Fund, Inc. (collectively, the "Funds"),
hereby constitute Ronald M. Wolfsheimer, William M. Tartikoff, Susan Walker
Bender, Katherine Stoner, Lisa Crossley, and Ivy Wafford Duke my true and
lawful attorneys, with full power to each of them, to sign for me and in my
name in the appropriate capacities, all registration statements and amendments
filed by the Funds with any federal or state agency, and to do all such things
in my name and behalf necessary for registering and maintaining registration
or exemptions from registration of the Funds with any government agency in any
jurisdiction, domestic or foreign.

         The same persons are authorized generally to do all such things in my
name and behalf to comply with the provisions of all federal, state and
foreign laws, regulations, and policy pronouncements affecting the Funds,
including, but not limited to, the Securities Act of 1933, the Securities
Exchange Act of 1934, the Investment Company Act of 1940, the Investment
Advisers Act of 1940, and all state laws regulating the securities industry.

         The same persons are further authorized to sign my name to any
document needed to maintain the lawful operation of the Funds in connection
with any transaction approved by the Board of Trustee/Directors.

         When any of the above-referenced attorneys signs my name to any
document in connection with maintaining the lawful operation of the Funds, the
signing is automatically ratified and confirmed by me by virtue of this Power
of Attorney.

         WITNESS my hand on the date set forth below.

May 7, 1997
Date                                        /Signature/

Edwidge Saint-Felix                         D. Wayne Silby
Witness                                     Name of Trustee/Director


<PAGE>



                               POWER OF ATTORNEY


         I, the undersigned Trustee/Director of First Variable Rate Fund for
Government Income, Calvert Tax-Free Reserves, Calvert Cash Reserves, The
Calvert Fund, and Calvert Municipal Fund, Inc. (collectively, the "Funds"),
hereby constitute Ronald M. Wolfsheimer, William M. Tartikoff, Susan Walker
Bender, Katherine Stoner, Lisa Crossley, and Ivy Wafford Duke my true and
lawful attorneys, with full power to each of them, to sign for me and in my
name in the appropriate capacities, all registration statements and amendments
filed by the Funds with any federal or state agency, and to do all such things
in my name and behalf necessary for registering and maintaining registration
or exemptions from registration of the Funds with any government agency in any
jurisdiction, domestic or foreign.

         The same persons are authorized generally to do all such things in my
name and behalf to comply with the provisions of all federal, state and
foreign laws, regulations, and policy pronouncements affecting the Funds,
including, but not limited to, the Securities Act of 1933, the Securities
Exchange Act of 1934, the Investment Company Act of 1940, the Investment
Advisers Act of 1940, and all state laws regulating the securities industry.

         The same persons are further authorized to sign my name to any
document needed to maintain the lawful operation of the Funds in connection
with any transaction approved by the Board of Trustee/Directors.

         When any of the above-referenced attorneys signs my name to any
document in connection with maintaining the lawful operation of the Funds, the
signing is automatically ratified and confirmed by me by virtue of this Power
of Attorney.

         WITNESS my hand on the date set forth below.

January 16, 1998
Date                                        /Signature/

Roger Wilkins                               Frederick Borts, M.D.
Witness                                     Name of Trustee/Director


<PAGE>


                               POWER OF ATTORNEY


         I, the undersigned officer of Calvert Social Investment Fund, Calvert
World Values Fund, Acacia Capital Corporation, Calvert New World Fund, First
Variable Rate Fund, Calvert Tax-Free Reserves, Calvert Cash Reserves, The
Calvert Fund and Calvert Municipal Fund (each, respectively, the "Fund"),
hereby constitute William M. Tartikoff, Susan Walker Bender, Katherine Stoner,
Lisa Crossley, and Ivy Wafford Duke my true and lawful attorneys, with full
power to each of them, to sign for me and in my name in the appropriate
capacities, all registration statements and amendments filed by the Fund with
any federal or state agency, and to do all such things in my name and behalf
necessary for registering and maintaining registration or exemptions from
registration of the Fund with any government agency in any jurisdiction,
domestic or foreign.

         The same persons are authorized generally to do all such things in my
name and behalf to comply with the provisions of all federal, state and
foreign laws, regulations, and policy pronouncements affecting the Funds,
including, but not limited to, the Securities Act of 1933, the Securities
Exchange Act of 1934, the Investment Company Act of 1940, the Investment
Advisers Act of 1940, and all state laws regulating the securities industry.

         The same persons are further authorized to sign my name to any
document needed to maintain the lawful operation of the Funds in connection
with any transaction approved by the Board of Trustee/Directors.

         When any of the above-referenced attorneys signs my name to any
document in connection with maintaining the lawful operation of the Funds, the
signing is automatically ratified and confirmed by me by virtue of this Power
of Attorney.

         WITNESS my hand on the date set forth below.

December 16, 1997
Date                                        /Signature/

William M. Tartikoff                        Ronald M. Wolfsheimer
Witness                                     Name of Officer





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