FIRST VARIABLE RATE FUND FOR GOVERNMENT INCOME /MD/
497, 1999-03-04
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                                  PROSPECTUS
                              February 28, 1999


                       The Advisors Group Reserve Fund
            a class of Calvert First Government Money Market Fund

                                     and

                     The Advisors Group Tax-Free Reserves
         a class of Calvert Tax-Free Reserves Money Market Portfolio





Table of Contents                           Page

About the Funds
     Investment goals                       1
     Principal Investment Strategies        1
     Risks of Investing                     2
     Performance Chart                      3
     Fees and Expenses                      4
About the Advisor
     Management                             5
     Year 2000                              5
Shareholder Guide:
How to Buy Shares                           6
Dividends, Capital Gains and Taxes          7
How to Sell Shares                          8


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 upon the accuracy or adequacy
of this prospectus. Any representation to the contrary is a criminal offense.

<PAGE>

Fundamental Goals - Investment Objectives

The Advisors Group Reserve Fund
The Advisors Group Reserve Fund (the "Reserve Fund") is a U.S.
Government-only money market fund that seeks to earn the highest possible
yield consistent with safety, liquidity, and preservation of capital. In
pursuing its objective, the Reserve Fund invests only in U.S.
Government-backed obligations, including such obligations subject to
repurchase agreements with recognized securities dealers and banks. The
Reserve Fund seeks to maintain a constant net asset value of $1.00 per share.

The Reserve Fund is offered in this prospectus to investors with brokerage
accounts at The Advisors Group, Inc.

The Advisors Group Tax-Free Reserves
The Advisors Group Tax-Free Reserves ("Tax-Free Reserves") seeks to earn the
highest interest income exempt from federal income taxes as is consistent
with prudent investment management, preservation of capital, and the quality
and maturity characteristics of Tax-Free Reserves. Tax-Free Reserves seeks
to maintain a constant net asset value of $1.00 per share.

Tax-Free Reserves is offered in this prospectus to investors with brokerage
accounts at The Advisors Group, Inc.

Principal Investment Strategies

Reserve Fund assets are invested only in short-term money market
instruments, such as:
      obligations issued by the U.S. Treasury, such as U.S. Treasury bills,
     notes and bonds, supported by the full faith and credit of the U.S.
     Government;
      Securities issued by the U.S. Government, its agencies and
     instrumentalities;
      repurchase agreements; and
      variable-rate demand notes.

Tax-Free Reserves assets are invested primarily in a diversified portfolio
of municipal obligations whose interest is exempt from federal income tax.
Tax-Free Reserves invests in:
      high quality variable and floating rate demand notes and/or municipal
     obligations;
      municipal bonds and notes and tax-exempt commercial paper; and
      short-term fixed-rate obligations with remaining maturities of
     thirteen months or less.

The Advisor looks for securities with strong credit quality 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. All investments must comply with the SEC money market fund
requirements.

<PAGE>

Risks of investing

The yield of the Reserve Fund and Tax-Free Reserves ("each Fund" or the
"Funds") will change daily, depending on market interest rates, and tends to
follow the same direction as the rates.

Dividends paid by each Fund will fluctuate as interest rates and net
investment income fluctuate.

Investments in obligations not guaranteed by the full faith and credit of
the U.S. Government are subject to the ability of the issuer to make payment
at maturity.

Many of the instruments held by Tax-Free Reserves are supported by letters
of credit issued by banks; thus, it has a wide exposure to the banking
industry.

Tax-Free Reserves may purchase securities that have not been rated by a
rating agency, so long as the Advisor determines they are of comparable
credit quality.

Unrated and privately placed securities may be less liquid than those that
are rated or have an active trading market.

The yield of each Fund will change in response to market interest rates. In
general, as market rates go up so will the Fund's yield, and vice versa.
Although the Fund tries to keep the value of its shares constant at $1.00
per share, extreme changes in market rates, and/or sudden credit
deterioration of a holding could cause the value to decrease. The Funds
limit the amount invested in any one issuer to try to lessen exposure.

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. Although the Funds seek to preserve the value of your
investment at $1.00 per share, it is still possible to lose money by
investing in the Funds.

Bar Charts and Performance Tables

The bar charts and tables below show the annual returns and its long-term
performance by calendar year for Class O of each of the Funds, shown as
Calvert First Government for the Reserve Fund and CTFR Money Market for the
Tax-Free Reserves Fund. The charts shows how the performance has varied from
year to year. The tables compare Class O returns over time to the Lipper
U.S. Government Money Market Funds Index for the Reserve Fund, and the
Lipper Tax-Exempt Money Market Funds Index for Tax-Free Reserves. Each index
is a composite index of the annual return of mutual funds that have similar
investment goals. Each Fund's past performance does not necessarily indicate
how it will perform in the future. Please note that performance for the
Reserve Fund and Tax-Free Reserves is not shown since it was not available
for either Fund during the time periods shown.

<PAGE>

Bar Chart - Class O
1989          8.56%        1994         3.65%
1990          7.61%        1995         5.22%
1991          5.65%        1996         4.79%
1992          3.39%        1997         5.00%
1993          2.70%        1998         4.93%

Best Quarter (of periods shown)       Q2 '89     2.22%
Worst Quarter (of periods shown)      Q2 '93     0.66%

Average annual total returns for the periods ended December 31, 1998

                                    1 year     5 years    10 years
Calvert First Government Class O    4.93%      4.72%      5.13%
Lipper U.S. Government Money
Market Funds Index                  4.95%      4.79%      5.19%

Bar Chart - Class O
1989          6.47%        1994         2.81%
1990          6.04%        1995         4.02%
1991          4.96%        1996         3.33%
1992          3.17%        1997         3.38%
1993          2.41%        1998         3.22%

Best Quarter (of periods shown)       Q2 '89     1.67%
Worst Quarter (of periods shown)      Q1 '93     0.56%

Average annual total returns for the periods ended December 31, 1998

                                    1 year     5 years    10 years
CTFR Money Market Class O           3.23%      3.35%      3.97%
Lipper Tax-Exempt Money
Market Funds Index                  3.04%      3.06%      3.58%

For current yield information, call 1-800-777-1500.

<PAGE>

Fees and Expenses of the Funds
These tables describe the fees and expenses you may pay if you buy and hold
shares of each Fund.

A.   Shareholder Fees
     (fees paid directly from your investment)
                                                      Reserve        Tax-Free
                                                      Fund           Reserves
     Maximum Sales Load on Purchases                  None           None
     Maximum Deferred Sales Load                      None           None
     Maximum Sales Load on Reinvested Dividends       None           None
     Redemption Fees                                  None           None
     Exchange Fee                                     None           None

B.   Estimated Annual Fund Operating Expenses
     (expenses that are deducted from Fund assets)
                                                      Reserve        Tax-Free
                                                      Fund           Reserves
     Management Fees                                  0.50%          0.46%
     Distribution and service (12b-1) fees            0.25%          0.25%
     Other Expenses                                   0.19%          0.14%
     Total Annual Fund Operating Expenses             0.94%          0.85%

C.   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;
               You redeem all shares at the end of the periods;
               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:

                      1 Year        3 Years      5 Years      10 Years

Reserve Fund          $87           $271         $471         $1,049

Tax-Free Reserves     $96           $300         $520         $1,155

<PAGE>

Management and Advisory Fees

Calvert Asset Management Company, Inc. ("CAMCO") is the investment advisor
for each Fund. CAMCO has been managing mutual funds since 1976, and is a
subsidiary of Calvert Group, Ltd. CAMCO currently advises 25 Calvert funds,
including the first and largest family of socially screened funds. CAMCO is
located at 4550 Montgomery Avenue, Suite 1000N, Bethesda, Maryland 20814. As
of December 31, 1998, it had over $6 billion in assets under management.

CAMCO provides the Funds with investment supervision and management;
administrative services and office space; and furnishes executive and other
personnel to the Funds. CAMCO also pays the salaries and fees of all
Trustees who are affiliated persons. CAMCO may pay certain advertising and
promotional expenses of the Funds. Pursuant to the Investment Advisory
Agreement, CAMCO is entitled to an annual advisory fee of 0.25% of the
average daily net assets of the Reserve Fund. The Tax-Free Reserves
Investment Advisory Agreement entitles CAMCO to receive an annual advisory
fee of 0.25% of the first $500 million of average daily net assets, 0.20% of
the next $500 million, and 0.15% on assets of $1 billion or more. CAMCO may
voluntarily waive a portion of its advisory fee.

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.

<PAGE>

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                              SHAREHOLDER GUIDE
- ------------------------------------------------------------------------------

HOW TO BUY SHARES

Please contact your local office of The Advisors Group, Inc. to open your
money market account. All transactions will be processed electronically
through the National Financial Proprietary Money Market Sweep Program on
behalf of The Advisors Group, Inc.

There is no minimum for initial investments and no minimum for subsequent
investments, provided you have a brokerage account with The Advisors Group,
Inc.

Because you are purchasing shares through a program of services offered by
The Advisors Group, Inc., a registered broker/dealer and investment advisor,
you should read program materials together with this Prospectus. Certain
account features have been modified for this program, and The Advisors
Group, Inc. may impose charges for their services.

Important - How Shares are Priced
The price of shares is based on each Fund's net asset value ("NAV"). NAV is
determined according to the "amortized cost" method. It is computed per
class 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.

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, such as
Columbus Day and Veterans Day, when the NYSE is open and each Fund is open,
but no purchases may be made due to the closure of the banking system.

When Your Account Will Be Credited
Your purchase will be processed at the NAV next calculated after your order
is received. Electronic sweeps into an account begin earning dividends the
next business day.

Each Fund reserves the right to suspend the offering of shares for a period
of time or to reject any specific purchase order.

<PAGE>

DIVIDENDS, CAPITAL GAINS AND TAXES

Each Fund accrues dividends daily from its net investment income, and pays
the dividends 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 Funds do not anticipate
making any such distributions unless available capital loss carryovers have
been used or have expired.

Dividend payment options
Dividends and any distributions are automatically reinvested in the same
Fund at NAV, unless you elect to have amounts of $10 or more paid in cash
(by check).

Federal Taxes
In January, The Advisors Group, Inc. will mail Form 1099-DIV, indicating
taxable 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. Dividends, including short-term capital
gains, are taxable as ordinary income. Distributions from long-term capital
gains are taxable as long-term capital gains, regardless of how long you
have owned shares.

Other Tax Information
In addition to federal taxes for the Reserve Fund, you may be subject to
state or local taxes on your investment, depending on the laws in your area.
You will be notified to the extent, if any, that dividends reflect interest
received from US government securities. Such dividends may be exempt from
certain state income taxes.

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.

<PAGE>

HOW TO SELL SHARES

You may redeem all or a portion of your shares on any day the Funds are open
for business, provided the amount requested is not on hold. Your shares will
be redeemed at the next NAV calculated after your redemption request is
received. You will receive dividends through the date the request is
received and processed. The proceeds will normally be sent to you on the
next business day, but if making immediate payment could adversely affect
your Fund, it may take up to seven (7) days to make payment. The Funds have
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. 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 such as
Columbus Day and Veterans Day, when the NYSE is open and each Fund is open,
but redemptions cannot be made due to the closure of the banking system.

BY TELEPHONE
You may redeem shares from your account by telephone and have your money
sent by check, electronically transferred, or wired to a bank you have
previously authorized by contacting your local office of The Advisors Group,
Inc.

CHECKWRITING
Checkwriting will be offered through The Advisors Group, Inc. The
checkwriting features vary, depending on what you choose when you open the
money market sweep account with The Advisors Group, Inc. Please see The
Advisors Group, Inc. program materials for information.

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

                             To Open an Account:
                                 800-777-1500

                           Performance and Prices:
                                 800-777-1500

                        Service for Existing Accounts:
                                 800-777-1500

                           Registered, Certified or
                               Overnight Mail:
                           The Advisors Group, Inc.
                            7315 Wisconsin Avenue
                           Bethesda, Maryland 20814

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

<PAGE>

Outside Back Cover Page

Statements of Additional Information ("SAIs") (dated February 28, 1999) for
the Funds have been filed with the Securities and Exchange Commission and is
incorporated by reference. Additional information about each Fund's
investments is available in each Fund's annual and semi-annual reports to
shareholders. The SAIs and each Fund's annual and semi-annual reports are
available, without charge and upon request, from the Funds at 800-777-1500.


Information about the Funds (including the SAIs) 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 Funds
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.


811-2633 First Variable Rate Fund

811-3101 Calvert Tax-Free Reserves

<PAGE>



                          First Variable Rate Fund:
                  Calvert First Government Money Market Fund

                     Statement of Additional Information
                              February 28, 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.
1004 Baltimore
6th Floor
Kansas City, Missouri 64105

INDEPENDENT ACCOUNTANTS
PricewaterhouseCoopers
250 West Pratt Street
Baltimore, Maryland 21201



     TABLE OF CONTENTS

     Investment Objective and Strategy                       2
     Investment Restrictions                                 3
     Dividends and Distributions                             4
     Tax Matters                                             4
     Net Asset Value                                         4
     Calculation of Yield                                    5
     Advertising                                             6
     Purchases and Redemption of Shares                      6
     Trustees and Officers                                   7
     Investment Advisor                                      9
     Administrative Services                                10
     Transfer and Shareholder Servicing Agent               10
     Portfolio Transactions                                 10
     Independent Accountants and Custodians                 11
     Method of Distribution                                 11
     General Information                                    12
     Control Persons and Principal Holders of Securities    12


<PAGE>


STATEMENT OF ADDITIONAL INFORMATION-February 28, 1999

                          FIRST VARIABLE RATE FUND:
                  CALVERT FIRST GOVERNMENT MONEY MARKET FUND
        4550 Montgomery Avenue, Suite 1000N, 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 First Variable Rate Fund Calvert First  Government  Money Market Fund
(the "Fund")  Prospectus,  dated February 28, 1999 for Class T, March 31, 1998
for Classes O, B, and C, and September 15, 1998 for the  Institutional  Class,
which may be  obtained  free of charge by writing  or calling  the Fund at the
telephone numbers listed above.

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

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                      INVESTMENT OBJECTIVE AND STRATEGY
- ------------------------------------------------------------------------------

         In pursuing  its  objective  of earning the  highest  possible  yield
consistent  with safety,  liquidity,  and  preservation  of capital,  the Fund
invests  solely  in  debt  obligations  issued  or  guaranteed  by the  United
States,  its agencies or  instrumentalities,  assignments  of interest in such
obligations,   and   commitments   to   purchase   such   obligations   ("U.S.
Government-backed    obligations").    The   Fund   may    invest    in   U.S.
Government-backed   obligations   subject  to   repurchase   agreements   with
recognized securities dealers and banks.
         The Fund engages in  repurchase  Agreements in order to earn a higher
rate of return  than it could  earn  simply  by  investing  in the  obligation
which is the subject of the repurchase  agreement.  Repurchase  agreements are
not,  however,  without risk. If the seller were to become bankrupt,  the Fund
might  realize a loss if the value of the  underlying  security  did not equal
or exceed the  repurchase  price.  In order to minimize  the risk of investing
in  repurchase  agreements,  the Fund engages in such  transactions  only with
recognized   securities   dealers  and  banks  and  in  all  instances   holds
underlying  securities with a value equal to the total  repurchase  price such
dealer  or bank has  agreed  to pay.  Repurchase  agreements  are  always  for
periods  of less than one year and no more than 10% of the  Fund's  assets may
be invested in repurchase agreements not terminable within seven days.
         Although   all   the   securities   purchased   by   the   Fund   are
Government-backed  as to principal or secured by such securities,  some of the
types of  Government  securities  the Fund buys may be sold at a premium which
is not backed by a Government  guarantee.  The premiums are amortized over the
life of the security;  however,  if a security  should  default or be prepaid,
the Fund could realize as a loss the unamortized portion of such premium.
         In the  Government-guaranteed  loan  market,  most  purchases  of new
issues are made under  firm  (forward)  commitment  agreements.  Purchases  of
long-term  fixed rate debt  securities  under such agreements can involve risk
of loss due to changes in the market rate of interest  between the  commitment
date and the  settlement  date.  Forward  commitment  agreements  for variable
rate  securities,  unlike  such  agreements  for fixed  rate  securities,  are
stable in value;  the Fund's  Advisor  believes the risk of loss under forward
commitment    agreements   involving   variable   rate   obligations   to   be
insignificant.
         All the Fund's  investments  maturing in more than one year will have
a variable rate feature under which the yield is adjusted  periodically  based
upon  changes in money market rates such as prime.  Such  adjustments  will be
made at  least  semi-annually.  Variable  rate  securities  minimize  the wide
fluctuations  in capital  value that  represent  the  traditional  drawback to
such  long-term  investments;  but this also means that should  interest rates
decline,  the  amount of return  paid by the Fund  will  decline  and the Fund
will  forego  the  opportunity  of  capital   appreciation  on  its  portfolio
securities.
         The foregoing  objective and policies may not be altered  without the
prior approval of the holders of a majority of the  outstanding  shares of the
Fund.  There is, of course,  no assurance  that the Fund will be successful in
meeting the above investment objective.
         The Fund does not intend to  concentrate  25% or more of the value of
its total  assets  in any one  industry,  except  that the Fund  reserves  the
freedom of action to  concentrate  its  investments  in government  securities
and certain bank instruments as detailed above.

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

Fundamental Investment Restrictions
         The  Fund  has   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 the Fund.

         (1) The Fund may not make any investment  inconsistent  with
         its  classification  as  a  diversified  investment  company
         under the 1940 Act.
         (2) The  Fund 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),  or domestic
         bank money market instruments.
         (3) The Fund  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,  the Fund
         may pledge, mortgage or hypothecate its assets.
         (4) The  Fund 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 the Fund's
         investment  objective  and  policies,  either  directly from
         the issuer,  or from an  underwriter  for an issuer,  may be
         deemed an underwriting.
         (5) The Fund  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 Fund 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
         the    Fund's    investment    objective,    policies    and
         restrictions, shall not constitute the making of a loan.

Nonfundamental Investment Restrictions
         The  Board of  Trustees  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) The Fund may not purchase common stocks, preferred stocks,
warrants, or other equity securities.
         (2) The Fund does not intend to make any purchases of securities if
borrowing exceeds 5% of total assets.
         (3) The Fund may not sell securities short.
         (4) The Fund may not write or purchase put or call options.

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

         Dividends  from the Fund's net  investment  income are declared daily
and paid  monthly.  Net  investment  income  consists of the  interest  income
earned on investments  (adjusted for  amortization of original issue or market
discount  or  premium),  less  expenses.  Realized  and  unrealized  gains and
losses are not  included in net  investment  income.  Net  short-term  capital
gains will be  distributed  once each year,  although the Fund may  distribute
them more  frequently  if  necessary in order to maintain the Fund's net asset
value at $1.00 per share.  Distributions  of net capital  gains,  if any,  are
normally  declared  and paid by the Fund once a year;  however,  the Fund does
not  intend to make any such  distributions  from  securities  profits  unless
available loss carryovers,  if any, have been used or have expired.  Dividends
and distributions may differ among the classes.
         Purchasers  of Fund shares begin  receiving  dividends  from the date
federal  funds are received by the Fund.  Purchases  by bank wire  received by
the  Fund's   custodian   prior  to  12:30  p.m.,   Eastern  time,   represent
immediately  available  federal  funds.   Shareholders   redeeming  shares  by
telephone,   electronic   funds  transfer  or  written  request  will  receive
dividends   through  the  date  that  the  redemption   request  is  received;
shareholders  redeeming shares by draft will receive  dividends up to the date
such draft is presented to the Fund for payment.

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

         The Fund  intends to  continue  to qualify  as  regulated  investment
companies under  Subchapter M of the Internal  Revenue Code. If for any reason
it should  fail to  qualify,  it would be taxed as a  corporation  at the Fund
level, rather than passing through its income and gains to shareholders.
         Dividends  of  net  investment   income  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.  Net long-term capital
gain  distributions,  if  any,  will  generally  be  includable  as  long-term
capital  gain  in the  gross  income  of  shareholders  who  are  citizens  or
residents of the United  States.  Whether such realized  securities  gains and
losses are long-or  short-term  depends on the period the  securities are held
by the Fund,  not the period  for which the  shareholder  holds  shares of the
Fund.
         The Fund is  required  to withhold  31% of any  dividends  (including
long-term  capital gain dividends,  if any) 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 Internal Revenue Code because
of  underreporting;  or (c)  the  Fund 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 of dividends withheld.
         Shareholders  exempt from backup withholding  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.  Non-resident  aliens also are
generally not subject to backup  withholding  but, along with certain  foreign
partnerships and foreign  corporations,  may instead be subject to withholding
under  section  1441  of the  Internal  Revenue  Code.  Shareholders  claiming
exemption  from backup  withholding  should call or write the Fund for further
information.
         Many states do not tax the portion of the Fund's  dividends  which is
derived from interest on U.S.  Government  obligations.  The law of the states
varies  concerning  the tax status of dividends  derived from U.S.  Government
obligations.  Accordingly,  shareholders  should  consult  their tax  advisors
about the tax status of  dividends  and  distributions  from the Fund in their
respective jurisdictions.

- ------------------------------------------------------------------------------
                               NET ASSET VALUE
- ------------------------------------------------------------------------------

         The net  asset  value  per  share  of the  Fund,  the  price at which
shares are redeemed  (and,  for Class B or C, less any  applicable  contingent
deferred  sales  charge,  "CDSC"),  is computed  by dividing  the value of the
Fund's  total  assets,  less its  liabilities,  by the total  number of shares
outstanding.  Net asset value is calculated  separately for each class.  It is
determined  every  business  day at the close of the New York  Stock  Exchange
(generally,  4:00  p.m.  Eastern  time),  and at such  other  times  as may be
appropriate  or  necessary.  The Fund does 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.
         The  Fund's  assets,   including  securities  subject  to  repurchase
agreements,  are normally  valued at their  amortized cost which does not take
into account  unrealized  capital gains or losses.  This  involves  valuing an
instrument  at its cost and  thereafter  assuming a constant  amortization  to
maturity of any discount or premium,  regardless of the impact of  fluctuating
interest  rates on the  market  value of the  instrument.  While  this  method
provides  certainty  in  valuation,  it may  result in  periods  during  which
value,  as  determined  by amortized  cost,  is higher or lower than the price
that  would  be  received  upon  sale of the  instrument.  During  periods  of
declining  interest  rates,  the daily yield on shares of the Fund may tend to
be higher than a like  computation  made by a fund with identical  investments
utilizing a method of  valuation  based upon market  prices and  estimates  of
market  prices  for  all of its  portfolio  instruments.  Thus,  if the use of
amortized cost by the Fund resulted in a lower  aggregate  portfolio  value on
a particular  day, a prospective  investor in the Fund would be able to obtain
a  somewhat  higher  yield  than  would  result  from  investment  in  a  fund
utilizing  solely  market  values,  and  existing  investors in the Fund would
receive  less  investment  income.  The  converse  would  apply in a period of
rising interest rates.
         Rule 2a-7 under the  Investment  Company Act of 1940 permits the Fund
to  value   its   assets  at   amortized   cost  if  the  Fund   maintains   a
dollar-weighted  average  maturity  of 90  days  or less  and  only  purchases
obligations  having  remaining  maturities  of 13  months  or less.  Rule 2a-7
further  requires,  as a  condition  of its use,  that the Fund invest only in
obligations  determined  by the  Trustees to be of high  quality  with minimal
credit risks and requires  the  Trustees to establish  procedures  designed to
stabilize,  to the extent reasonably  possible,  the Fund's price per share as
computed for the purpose of sales and  redemptions at $1.00.  Such  procedures
include  review of the Fund's  investment  holdings by the  Trustees,  at such
intervals as they may deem  appropriate,  to determine  whether the Fund's net
asset value  calculated by using  available  market  quotations or equivalents
deviates  from  $1.00 per  share.  If such  deviation  exceeds  l/2 of 1%, the
Trustees will promptly  consider  what action,  if any, will be initiated.  In
the event the Trustees  determine that a deviation  exists which may result in
material   dilution  or  other   unfair   results  to  investors  or  existing
shareholders,  the Trustees  will take such  corrective  action as they regard
as necessary and  appropriate,  including:  the sale of portfolio  instruments
prior to maturity  to realize  capital  gains or losses or to shorten  average
portfolio  maturity;  the withholding of dividends or payment of distributions
from  capital  or  capital  gains;  redemptions  of  shares  in  kind;  or the
establishment  of a net asset  value per share  based  upon  available  market
quotations.

Net Asset Value and Offering Price Per Share, December 31, 1998
         ($246,018,576/246,534,740 shares)           $1.00

- ------------------------------------------------------------------------------
                             CALCULATION OF YIELD
- ------------------------------------------------------------------------------

         Yield is  calculated  separately  by class by dividing the net change
exclusive  of  capital  changes  in the value of a share  during a  particular
base period by the net asset value per share at the  beginning  of such period
and annualizing the result.  Capital changes  excluded from the calculation of
yield are:  (1)  realized  gains and losses from the sale of  securities,  and
(2) unrealized  appreciation and depreciation.  The Fund's effective yield for
a seven-day  period is its  annualized  compounded  average  yield  during the
period, calculated according to the following formula:

            Effective yield = [(Base period return + 1)365/7] - 1

For the seven day  period  ended  December  31,  1998,  the  Fund's  yield and
effective yield were as follows:

                      Yield                 Effective Yield
Class O               2.56%                 2.59%
Class B               1.87%                 1.89%
Class C               1.80%                 1.82%
Class I               2.83%                 2.87%
Class T               N/A                   N/A

         The Fund's  yield  fluctuates  in  response  to  changes in  interest
rates  and  general  economic   conditions,   portfolio   quality,   portfolio
maturity,  and  operating  expenses.   Yield  is  not  fixed  or  insured  and
therefore  is not  comparable  to a savings  or other  similar  type  account.
Yield  during  any  particular   time  period  should  not  be  considered  an
indication of future yield.  It is,  however,  useful in evaluating the Fund's
performance  in meeting its  investment  objective.  No yield is presented for
Class T because it was not offered as of the fiscal year ending  December  31,
1998.

- ------------------------------------------------------------------------------
                                 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 Fund 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 Fund, 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 Fund
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.

- ------------------------------------------------------------------------------
                      PURCHASES AND REDEMPTION OF SHARES
- ------------------------------------------------------------------------------

         Share  certificates  will not be issued  unless  requested in writing
by the investor.  No charge will be made for share  certificate  requests.  No
certificates  will be issued for fractional  shares (see  Prospectus,  "How to
Sell  Your  Shares").  Certain  Class  B and C  Shares  may  be  subject  to a
contingent  deferred  sales charge  which is  subtracted  from the  redemption
proceeds (See Prospectus, "Calculation of Contingent Deferred Sales Charge").
         Class  O  shareholders  wishing  to use  the  draft  writing  service
should  complete the signature card enclosed with the Investment  Application.
The draft  writing  service is not  available  for Class B, C, I, or T Shares.
The  draft  writing  service  will  be  subject  to the  customary  rules  and
regulations  governing checking  accounts,  and the Fund reserves the right to
change or suspend the  service.  Generally,  there is no charge to you for the
maintenance  of  this  service  or the  clearance  of  drafts,  but  the  Fund
reserves  the  right  to  charge  a  service  fee  for  drafts   returned  for
uncollected or insufficient  funds, and will charge $25 for stop payments.  As
a service to  shareholders,  the Fund may  automatically  transfer  the dollar
amount  necessary  to cover  drafts you have  written on the Fund to your Fund
account  from any other of your  identically  registered  accounts  in Calvert
money  market  funds or Calvert  Insured  Plus.  The Fund may charge a fee for
this service.
         When a  payable  through  draft is  presented  to the  Custodian  for
payment,   a  sufficient  number  of  full  and  fractional  shares  from  the
shareholder's  account to cover the amount of the draft  will be  redeemed  at
the net asset value next determined.  If there are insufficient  shares in the
shareholder's  account,  the  draft  may be  returned.  Drafts  presented  for
payment  which would require the  redemption  of shares  purchased by check or
electronic  funds  transfer  within the  previous 10 business  days may not be
honored.
         Existing  shareholders,  other than  Class T, who at any time  desire
to arrange for the telephone redemption  procedure,  or to change instructions
already given,  must send a written notice to Calvert Group,  P.O. Box 419544,
Kansas  City,  MO  64141-6544,  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 credit union.  Further  documentation may be required
from  corporations,   fiduciaries,   and  institutional  investors.   Class  T
shareholders should contact their broker, The Advisors Group, Ltd.
         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.

- ------------------------------------------------------------------------------
                            TRUSTEES AND OFFICERS
- ------------------------------------------------------------------------------

         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 Trustees and  Officers,  unless  otherwise  noted,  is
4550 Montgomery Avenue, Suite 1000N,  Bethesda,  Maryland 20814.  Trustees and
Officers as a group own less than 1% of the  Portfolio's  outstanding  shares.
Trustees  marked  with an *,  above,  are  "interested  persons"  of the Fund,
under the Investment Company Act of 1940.
         Each of the  above  named  trustees  and  officers  is a  trustee  or
officer of each of the  investment  companies  in the  Calvert  Group of Funds
with the exception of Calvert  Social  Investment  Fund, of which only Messrs.
Baird,  Guffey  and Silby and Ms.  Krumsiek  are among the  Trustees,  Calvert
Variable  Series,  Inc., of which only Messrs.  Blatz,  Diehl and Pugh and Ms.
Krumsiek are among the  Directors,  Calvert World Values Fund,  Inc., of which
only Messrs.  Guffey and Silby and Ms.  Krumsiek are among the Directors,  and
Calvert New World Fund,  Inc., of which only and Ms.  Krumsiek and Mr. Martini
are among the Directors.
         The Board's  Audit  Committee  is composed of Messrs.  Baird,  Blatz,
Feldman,  Guffey and Pugh and Ms. Kruvant.  The Investment Policy Committee is
composed of Messrs. Borts, Diehl, Gavian, Rochat and Silby and Ms. Krumsiek.
         During  fiscal  1998,  trustees of the Fund not  affiliated  with the
Fund's  Advisor were paid $30,434.  Trustees of the Fund not  affiliated  with
the  Advisor  presently  receive  an annual fee of  $20,500  for  service as a
member of the Board of Trustees of the  Calvert  Group of Funds,  and a fee of
$750 to $1,500 for each regular  Board or  Committee  meeting  attended;  such
fees are allocated among the respective Funds on the basis of net assets.
         Trustees  of the Fund not  affiliated  with the  Fund's  Advisor  may
elect to defer  receipt of all or a  percentage  of their fees and invest them
in any fund in the  Calvert  Family of Funds  through  the  Trustees  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.

                          Trustee 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 Trustee        of Registrant     Trustee**
                                        Expenses*

Name of Trustee

Richard L. Baird, Jr. $2,444            $0                $39,550
Frank H. Blatz, Jr.   $2,556            $2,556            $42,100
Frederick T. Borts    $2,333            $0                $33,250
Charles E. Diehl      $2,557            $2,557            $41,500
Douglas E. Feldman    $2,556            $0                $36,250
Peter W. Gavian       $2,556            $1,278            $36,250
John G. Guffey, Jr.   $2,456            $0                $62,665
M. Charito Kruvant    $2,556            $1,534            $36,250
Arthur J. Pugh        $2,556            $0                $41,500
D. Wayne Silby        $2,445            $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, 1998. 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  (the  "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 Board of Trustees  of the Fund;  and
further provided that such  continuance is also approved  annually by the vote
of a  majority  of the  Trustees  of the  Fund  who  are  not  parties  to the
Contract,  interested  persons  of  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  upon  60  days'  prior  written  notice;  it  automatically
terminates in the event of its assignment.
         Under the Contract,  the Advisor  provides  investment  advice to the
fund  and  oversees  its  day-to-day  operations,  subject  to  direction  and
control by the Fund's  Board of Trustees.  For its  services,  effective  with
the  commencement of the  Institutional  Class  (September  1998), the Advisor
receives a fee of 0.25% of the first $500  million  of the  average  daily net
assets of the Fund,  0.225% of the next $400 million of such assets,  0.20% of
the next $400  million  of such  assets,  0.175% of the next $700  million  of
such  assets,  and 0.15% on all  assets in excess of $2  billion.  Such fee is
payable monthly.
         The Advisor  provides the Fund with  investment  advice and research,
pays the  salaries  and fees of all  Trustees  and  executive  officers of the
Fund who are  principals  of the Advisor,  and pays  certain Fund  advertising
and  promotional  expenses.   The  Fund  pays  all  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.  However,  the  Advisor  has  agreed  to
reimburse the Fund for all expenses  (excluding  brokerage,  taxes,  interest,
and  extraordinary  items)  exceeding,  on a pro rata basis,  1% of the Fund's
average daily net assets.
         The advisory  fees paid to the Advisor  under the  Advisory  Contract
for the 1996,  1997, and 1998 fiscal years were  $1,238,849,  $1,206,618,  and
$1,037,947,  respectively.  No expense reimbursements have been required under
the Contract.

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

         Calvert  Administrative  Services  Company  ("CASC"),  a wholly-owned
subsidiary of Calvert  Group,  Ltd.,  has been retained by the Fund to provide
certain  administrative  services  necessary  to the  conduct  of  the  Fund's
affairs.  Such services  include the  preparation  of corporate and regulatory
reports and filings,  portfolio  accounting,  and the daily  determination  of
net  investment  income  and net asset  value per  share.  Effective  with the
commencement of the Institutional  Class (September  1998),  Classes O, B, and
C pay an annual rate of 0.25%,  while the  Institutional  Class pays an annual
rate of  0.05%,  based on  average  daily net  assets.  Class T pays an annual
rate of 0.25%.  There were no  administrative  services  fees paid by the Fund
in the 1997 fiscal year.  During  fiscal year 1998,  the Fund paid $208,596 in
administrative fees.

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                   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., and Acacia Mutual,  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 its fiscal  years ended  December 31,  1996,  1997 and 1998,  the
Fund paid fees of $561,279, $447,044, and $503,037, respectively.

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

         Portfolio   transactions   are  undertaken  on  the  basis  of  their
desirability from an investment  standpoint.  Investment  decisions and choice
of brokers  and  dealers are made by the Fund's  Advisor  under the  direction
and supervision of the Fund's Board of Trustees.
         It is  intended  that all  securities  maturing in more than one year
will be held to maturity.  Sales of securities to  facilitate  the  redemption
of Fund  shares is  contemplated,  but such sales will be  primarily  from the
short-term  instruments in the Fund's  portfolio on which  brokerage  charges,
if any, are minimal.  The Fund  anticipates  that its portfolio  turnover rate
with respect to  securities  with  maturities in excess of one year will be no
more than 5%.
         Broker-dealers  who execute  portfolio  transactions on behalf of the
Fund  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  of sale of  portfolio  securities  with  dealers who
provide it with  statistical,  research,  or other  information  and services.
Although  any  statistical,   research,  or  other  information  and  services
provided by dealers  may be useful to the  Advisor,  the dollar  value of such
information  is  generally  indeterminable,  and its  availability  or receipt
does not serve to materially  reduce the Advisor's normal research  activities
or expenses.  No  brokerage  commissions  have been paid to any  broker-dealer
that provided the Fund's Advisor with research or other services.
         The Advisor may also execute  portfolio  transactions with or through
broker-dealers  who have sold  shares of the Fund.  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 Fund
shares sold. The Advisor may compensate,  at its expense,  such broker-dealers
in consideration of their promotional and administrative services.

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

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

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

         The Fund has entered  into an agreement  with  Calvert  Distributors,
Inc.  ("CDI")  whereby  CDI,  acting as  principal  underwriter  for the Fund,
makes a  continuous  offering  of the Fund's  securities  on a "best  efforts"
basis.  Under  the  terms of the  agreement,  CDI is  entitled  to  receive  a
distribution  fee from the Fund paid through the  Distribution  Plans of Class
B, C, and T. Class O and the Institutional  Class have no Distribution  Plans.
For Class B and Class C shares, CDI receives any CDSC paid.
         Pursuant  to Rule  12b-1  under the 1940 Act,  Class B, C, and T have
adopted  Distribution  Plans (the  "Plans")  which  permit them to pay certain
expenses  associated with the distribution  and servicing of its shares.  Such
expenses may not exceed,  on an annual  basis,  1.00% of the average daily net
assets of Class B and C, respectively, and 0.25% of Class T.
         The  Distribution  Plans  were  approved  by the  Board of  Trustees,
including the Trustees who are not  "interested  persons" of the Fund (as that
term  is  defined  in the  1940  Act)  and  who  have no  direct  or  indirect
financial  interest  in the  operation  of  the  Plans  or in  any  agreements
related to the Plans.  The  selection  and  nomination of the Trustees who are
not  interested  persons of the Fund is  committed to the  discretion  of such
disinterested  Trustees.  In establishing the Plans,  the Trustees  considered
various  factors  including  the  amount  of the  distribution  expenses.  The
Trustees  determined  that  there is a  reasonable  likelihood  that the Plans
will benefit the affected Class and its shareholders.
         The  Plans  may  be   terminated   by  vote  of  a  majority  of  the
non-interested  Trustees who have no direct or indirect  financial interest in
the  Plans,  or by  vote  of a  majority  of  the  outstanding  shares  of the
affected  class or  Portfolio.  Any change in the Plans that would  materially
increase the cost to the  affected  Class of  Portfolio  requires  approval of
the  shareholders  of that class;  otherwise,  the Plans may be amended by the
Trustees,  including a majority of the  non-interested  Trustees as  described
above.  The Plans  will  continue  in effect  for  successive  one-year  terms
provided that such  continuance is specifically  approved by (i) the vote of a
majority  of the  Trustees  who are not  parties  to the  Plans or  interested
persons  of any  such  party  and who have no  direct  or  indirect  financial
interest  in the Plans,  and (ii) the vote of a majority  of the entire  Board
of Trustees.
         Apart from the Plans,  the  Advisor  and CDI,  at their own  expense,
may incur costs and pay expenses  associated  with the  distribution of shares
of the Portfolio.
         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
Portfolio.  Such  compensation may include  additional  compensation  based on
assets  held  through  that firm beyond the  regularly  scheduled  rates,  and
finder's  fees payments to firms whose  representatives  are  responsible  for
soliciting a new account where the  accountholder  does not choose to purchase
through that firm.

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

         The Fund is  organized as a  Massachusetts  business  trust,  and has
one series,  the Calvert  First  Government  Money Market Fund which was known
as  First   Variable  Rate  Fund  prior  to  September  1,  1991.  The  Fund's
Declaration of Trust contains an express  disclaimer of shareholder  liability
for  acts or  obligations  of the  Fund.  The  shareholders  of  Massachusetts
business  trust  might,  however,   under  certain   circumstances,   be  held
personally  liable as partners for its  obligations.  The Declaration of Trust
provides  for  indemnification  and  reimbursement  of  expenses  out of  Fund
assets for any  shareholder  held  personally  liable for  obligations  of the
Fund. The  Declaration  of Trust  provides that the Fund shall,  upon request,
assume the defense of any claim made  against any  shareholder  for any act or
obligation of the Fund and satisfy any judgment  thereon.  The  Declaration of
Trust further provides that the Fund may maintain  appropriate  insurance (for
example,  fidelity  bonding  and  errors  and  omissions  insurance)  for  the
protection of the Fund, its shareholders,  trustees,  officers,  employees and
agents to cover  possible  tort and  other  liabilities.  Thus,  the risk of a
shareholder  incurring  financial loss on account of shareholder  liability is
limited to  circumstances  in which both inadequate  insurance  exists and the
Fund itself is unable to meet its obligations.
         The Fund offers five  separate  classes of shares:  Class O, Class B,
Class C, offered in one  prospectus;  the  Institutional  Class,  offered in a
separate  prospectus,  and Class T, also  offered  by a  separate  prospectus.
Class T is also  known  as The  Advisors  Group  Reserves  Fund.  The  classes
represent  interests  in the same  portfolio  of  investments  but, as further
described in the  prospectuses,  each class may be subject to differing  sales
charges  and   expenses,   which  will  result  in  different   dividends  and
distributions.  Upon any  liquidation of the Fund,  shareholders of each class
are entitled to share pro rata in the net assets available for distribution.
         The Fund will send its shareholders  periodic transaction  statements
and  unaudited  semi-annual  and audited  annual  financial  statements of the
Fund's  investment  securities,  assets and liabilities,  income and expenses,
and changes in net assets.
         The  Prospectuses  and this  Statement of Additional  Information  do
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 February 25, 1999, the following  shareholders  owned of record
5% or more of the Class of Calvert First Government Money Market Fund shown:

         Name and Address                        % of Ownership

         Saul Maluth
         Hicksville, New York                    39.96%, Class B

         Craig Miller
         Bend, Oregon                            27.92%, Class B

         Hillel Gray
         Jerusalem, Israel                       9.86%, Class B

         Sharon Simes
         Seattle, Washington                     8.65%, Class B

         Ginger Carney
         Chicago, Illinois                       6.26%, Class B

         Laurie Davidson
         Renton, Washington                      18.92%, Class C

         S. Davis
         Thomas Fugate Co. Ttee.
         Burlington, Vermont                     11.80%, Class C

         Lionel Weisman
         Lake Oswego, Oregon                     9.88%, Class C

         Painewebber FBO
         D. Solnit                               6.72%, Class C

         Community of Hospitality
         Decatur, Georgia                        5.91%, Class C

         A. Short & A. Connor
         Covington, Georgia                      5.85%, Class C

         Maryland State Treasurer
         Annapolis, Maryland                     52.85%, Class I

         Working Assets Funding
         San Francisco, California               17.80%, Class I

         Montgomery County Government
         Rockville, Maryland                     11.80%, Class I





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