CALVERT TAX FREE RESERVES
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>

- ------------------------------------------------------------------------------
                              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>



                          Calvert Tax-Free Reserves
                            Money Market Portfolio
                            Limited-Term Portfolio

                     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                                      2
     Investment Policies                                       2
     Investment Restrictions                                   4
     Purchases and Redemptions of Shares                       4
     Reduced Sales Charges                                     5
     Dividends and Distributions                               5
     Tax Matters                                               6
     Valuation of Shares                                       6
     Calculation of Yield and Total Return                     7
     Advertising                                               9
     Trustees and Officers                                     9
     Investment Advisor                                       11
     Administrative Services                                  12
     Transfer and Shareholder Servicing Agents                12
     Independent Accountants and Custodians                   12
     Method of Distribution                                   13
     Portfolio Transactions                                   13
     General Information                                      13
     Control Persons and Principal Holders of Securities      14
     Appendix                                                 15

<PAGE>

STATEMENT OF ADDITIONAL INFORMATION-February 28, 1999

                          CALVERT TAX-FREE RESERVES
                            Money Market Portfolio
                            Limited-Term Portfolio
               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  Calvert  Tax-Free  Reserves  Prospectus,  dated  April 30,  1998 for
Class O and I, and February  28, 1999 for Class T, which may be obtained  free
of charge by writing the Fund at the above  address or calling  the  telephone
numbers listed above.

         The audited  financial  statements in the  Portfolios'  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 Portfolios.

- ------------------------------------------------------------------------------
                             INVESTMENT OBJECTIVE
- ------------------------------------------------------------------------------

         The Money Market and Limited-Term  Portfolios (the  "Portfolios") are
series  of  Calvert  Tax-Free  Reserves  (the  "Fund"),  and are  designed  to
provide  individual  and  institutional  investors in higher tax brackets with
the highest level of interest  income  exempt from federal  income taxes as is
consistent with prudent investment  management,  preservation of capital,  and
the quality and maturity  characteristics  prescribed for each Portfolio.  The
Money Market  Portfolio  further  seeks to maintain a constant net asset value
of $1.00 per share.  There is, of course,  no  assurance  that the  Portfolios
will be successful in meeting their  investment  objectives or maintaining the
Money Market  Portfolio's  net asset value constant at $1.00 per share because
there are inherent risks in the ownership of any investment.
         Dividends  paid by the  Portfolios  will fluctuate with income earned
on  investments.  In addition,  the dividends and  distributions  paid and the
value  of  each  share  will  vary  by  class  of  shares;  the  value  of the
Limited-Term  Portfolio's  shares  will  fluctuate  to reflect  changes in the
market value of the  Portfolio's  investments.  The  Portfolios  will attempt,
through  careful  management  and  diversification,  to reduce these risks and
enhance the opportunities for higher income and greater price stability.

- ------------------------------------------------------------------------------
                             INVESTMENT POLICIES
- ------------------------------------------------------------------------------

         The Money Market  Portfolio and  Limited-Term  Portfolio  each invest
primarily in a diversified  portfolio of municipal  obligations whose interest
is  exempt  from  federal   income  tax.  The   Portfolios   differ  in  their
anticipated income yields,  quality,  length of average weighted maturity, and
capital value  volatility.  A complete  explanation  of municipal  obligations
and municipal bond and note ratings is set forth in the Appendix.
         The credit  rating of each  Portfolio's  assets as of its most recent
fiscal  year-end  appears in the Annual Report to  Shareholders,  incorporated
by reference herein.

Variable Rate Demand Notes
         The Board of  Trustees  has  approved  investments  in  floating  and
variable rate demand notes upon the following  conditions:  the Fund has 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 Fund has the right to  dispose of the notes
at a price which approximates par and market value.

Municipal Leases
         The  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.  The 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 the  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  the  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 the
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 the  Portfolio  has valued it
for purposes of  calculating  the  Portfolio's  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 the Portfolio.

Obligations with Puts Attached
         The  Fund has  authority  to  purchase  securities  at a price  which
would result in a yield to maturity lower than that  generally  offered by the
seller  at the time of  purchase  when it can  acquire  at the  same  time the
right to sell the  securities  back to the  seller at an agreed  upon price at
any  time  during  a  stated  period  or on a  certain  date.  Such a right is
generally  denoted  as a  "put."  A  Portfolio  may  not  acquire  obligations
subject to puts if  immediately  thereafter,  with respect to 75% of the total
amortized  cost value of its assets,  that  Portfolio  would have more than 5%
of  its  assets   invested  in  securities   underlying  puts  from  the  same
institution.  A  Portfolio  may,  however,  invest up to 10% of its  assets in
securities   underlying   unconditional   puts  from  the  same   institution.
Unconditional  puts are  readily  exercisable  in the  event of a  default  in
payment of  principal  or interest  on the  underlying  securities.  The Money
Market  Portfolio  must limit its portfolio  investments,  including  puts, to
instruments  of  high  quality  as  determined  by  a  nationally   recognized
statistical rating organization.

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.
         The Fund  intends to  minimize  taxable  income  through  investment,
when  possible,  in  short-term  tax-exempt  securities.  To minimize  taxable
income,  the Fund may also  hold cash  which is not  earning  income.  It is a
fundamental  policy of the Fund  that  during  normal  market  conditions  the
Fund's  assets be  invested so that at least 80% of the Fund's  annual  income
will be tax-exempt.

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  Limited-Term  Portfolio 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  Limited-Term  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,  the Limited-Term  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,  Limited-Term
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  Limited-Term'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  Limited-Term   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  Limited-Term'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.

- ------------------------------------------------------------------------------
                           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 the Portfolios.

         (1)   Each   Portfolio   may   not   make   any   investment
         inconsistent  with  its   classification  as  a  diversified
         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), or domestic bank money market instruments.
         (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  the  affected  Portfolio's  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,  each Portfolio may pledge,  mortgage or
         hypothecate its assets.
         (4) Each  Portfolio  may not  underwrite  the  securities of
         other  issuers,  except as  allowed  by law or to the extent
         that the purchase of  municipal  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  a  Portfolio   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) Each  Portfolio  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
         each   Portfolio'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) 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 the affected Portfolio's
             total assets.
         (3) Each Portfolio may not sell securities short, purchase
             securities on margin, or write put or call options, except as
             permitted for Long-Term and Vermont in connection with
             transactions in futures contracts and options thereon. Each
             Portfolio reserves the right to purchase securities with puts
             attached or with demand features.
         (4) Each Portfolio may not write or purchase put or call options.

- ------------------------------------------------------------------------------
                     PURCHASES AND REDEMPTIONS 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.
         Draft   writing  is  available   for  the  Money  Market   Portfolio.
Shareholders  wishing to use the draft  writing  service  should  complete the
signature  card enclosed with the  Investment  Application.  This service will
be  subject  to  the  customary  rules  and  regulations   governing  checking
accounts,  and the  Portfolio  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  Portfolio  reserves the right to
charge  a  service  fee for  drafts  returned  for  insufficient  funds.  As a
service to shareholders,  the Portfolio may automatically  transfer the dollar
amount  necessary to cover  drafts you have  written on the  Portfolio to your
account  from any other of your  identically  registered  accounts  in Calvert
money market funds or Calvert  Insured  Plus.  The  Portfolio may charge a fee
for this service.
         Drafts  presented to the  Custodian  for payment  which would require
the  redemption  of shares  purchased by check or  electronic  funds  transfer
within the previous 10 business days will not be honored.
         When a payable  through draft  ("check") is presented 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 will be returned.
         To change redemption  instructions  already given,  shareholders must
send a written notice to Calvert Group,  c/o NFDS, 6th Floor,  1004 Baltimore,
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  credit  union.  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.
         Redemption  proceeds  are  normally  paid  in  cash.   However,   the
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 the Portfolio, whichever is less.

- ------------------------------------------------------------------------------
                            REDUCED SALES CHARGES
- ------------------------------------------------------------------------------

         The Limited-Term  Portfolio  imposes reduced sales charges for shares
in certain  situations  in which the Principal  Underwriter  (which offers the
Portfolio's  shares  continuously  and on a  "best  efforts"  basis)  and  the
dealers  selling   Limited-Term   Portfolio   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;
the  per-dollar  transaction  cost for a sale to an investor of shares  worth,
say,  $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  Portfolio
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 Portfolio  shares
to  their   members.   See  "Exhibit  A  -  Reduced  Sales   Charges"  in  the
Limited-Term Prospectus.

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

         The  Money  Market   Portfolio   declares   daily  and  pays  monthly
dividends  of its daily net income to  shareholders  of record as of the close
of business each business day, thus allowing  daily  compounding of dividends.
The  Limited-Term  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  paid by each
Portfolio  may 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,  subject to the  applicable  sales charge for that
Fund or Portfolio.  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.
         Purchasers  of  shares  of the  Money  Market  Portfolio  will  begin
receiving  dividends  upon the date  federal  funds are  received by the Fund.
Shareholders  redeeming  shares by  telephone  electronic  funds  transfer  or
written  request will receive  dividends  through the date that the redemption
request is received;  Money Market Portfolio  shareholders redeeming shares by
draft will  receive  dividends  up to the date such draft is  presented to the
Portfolio for payment.

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

         The Funds  intend to  continue  to  qualify as  regulated  investment
companies under  Subchapter M of the Internal  Revenue Code. If for any reason
one of the Funds  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.
         The  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.
         A  shareholder  may also be  subject  to  state  and  local  taxes on
dividends and distributions  from the Fund. The Fund will notify  shareholders
annually about the federal tax status of dividends and  distributions  paid by
the Fund 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
the Fund.  "Substantial  user" is generally defined as including a "non-exempt
person"  who  regularly  uses  in  trade  or  business  a part  of a  facility
financed from the proceeds of private activity bonds.
         Investors  should  note  that  the  Code  may  require  investors  to
exclude  the  initial  sales   charge,   if  any,  paid  on  the  purchase  of
Limited-Term  Portfolio  shares  from the tax  basis of  those  shares  if the
shares are exchanged  for shares of another  Calvert Group Fund within 90 days
of purchase.  This requirement  applies only to the extent that the payment of
the original  sales charge on the shares of the  Portfolio  causes a reduction
in the sales  charge  otherwise  payable  on the shares of the  Calvert  Group
Fund  acquired  in  the  exchange,  and  investors  may  treat  sales  charges
excluded  from the basis of the original  sales as incurred to acquire the new
shares.
         The Fund is required to withhold  31% of any  long-term  capital gain
dividends   and  31%  of  each   redemption   transaction   occurring  in  the
Limited-Term  Portfolio 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) 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
withheld.
         In  addition,  the  Limited-Term  Portfolio  is required to report to
the  Internal  Revenue  Service  the  following  information  with  respect to
redemption  transactions  in  the  Portfolio:   (a)  the  shareholder's  name,
address,  account number and taxpayer  identification  number;  (b) the dollar
value of the redemptions; and (c) the Portfolio's 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.  Non-resident  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 the Fund
for further information.

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

Money Market Portfolio
         The  Money  Market  Portfolio's  assets,   including  commitments  to
purchase  securities  on a  when-issued  basis,  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  Money  Market  Portfolio  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 Money
Market  Portfolio  resulted  in  a  lower  aggregate   portfolio  value  on  a
particular  day, a  prospective  investor  in the  Portfolio  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  Portfolio
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 the assets of the Money Market  Portfolio  at  amortized  cost if the
Money Market  Portfolio  maintains a  dollar-weighted  average  maturity of 90
days or less and only purchases  obligations  having  remaining  maturities of
one year or less.  Rule 2a-7  requires,  as a condition  of its use,  that the
Money Market Portfolio  invest only in obligations  determined by the Trustees
to be of high  quality  with  minimal  credit  risks and further  requires the
Trustees  to  establish  procedures  designed  to  stabilize,  to  the  extent
reasonably  possible,  the  Portfolio's  price per share as  computed  for the
purpose of sales and redemptions at $1.00.  Such procedures  include review of
the  Portfolio's  investment  holdings by the Trustees,  at such  intervals as
they may deem  appropriate,  to determine  whether the  Portfolio's  net asset
value  calculated  by  using  available   market   quotations  or  equivalents
deviates  from $1.00 per share  based on  amortized  cost.  If such  deviation
exceeds 0.50%, 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 on available
market quotations.

Limited-Term Portfolio
         The  Limited-Term   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 Trustees.
         Valuations,  market  quotations and market  equivalents  are provided
the Portfolio by Kenny S&P Evaluation  Services,  a subsidiary of McGraw-Hill.
The use of Kenny as a pricing  service by the  Portfolio  has been approved by
the Board of Trustees.  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 of 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, 12/31/98
Money Market Portfolio
         Class O ($1,355,321,661/1,355,203,424 shares)            $1.00
         Institutional Class ($246,966,868/246,940,916 shares)    $1.00
         Class T not available on 12/31/98

Limited-Term Portfolio
         Net asset value per share
         ($547,212,080/51,073,163 shares)                        $10.71
         Maximum sales charge
         (1.00% of offering price)                                 0.11
         Offering price per share                                $10.82

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

Money Market Portfolio
         From time to time the Money Market  Portfolio  advertises its "yield"
and  "effective  yield." Both yield figures are based on  historical  earnings
and are not  intended  to indicate  future  performance.  Yield is  calculated
separately by class.  The "yield" of the Money Market  Portfolio refers to the
income  generated by an  investment in the  Portfolio  over a particular  base
period  of time.  The  length  and  closing  date of the base  period  will be
stated in the  advertisement.  If the base  period is less than one year,  the
yield is then  "annualized."  That is, the net  change,  exclusive  of capital
changes,  in the value of a share  during  the base  period is  divided by the
net asset value per share at the  beginning  of the period,  and the result is
multiplied  by 365 and  divided  by the  number  of days in the  base  period.
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  Money  Market  Portfolio's  "effective
yield" for a seven-day  period is its annualized  compounded  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  Money  Market
Portfolio's  yield for Class O shares  was 2.01% and its  effective  yield was
2.03%.  For the  seven-day  period ended  December 31, 1998,  the Money Market
Portfolio's  yield for the  Institutional  Class of  shares  was 2.19% and its
effective  yield was 2.22%.  Class T was not  available  on December 31, 1998;
therefore, no yield is presented.

         The Money Market  Portfolio  also may  advertise,  from time to time,
its  "tax  equivalent  yield."  The  tax  equivalent  yield  is the  yield  an
investor  would be required to obtain from  taxable  investments  to equal the
Portfolio's  yield,  all or a  portion  of which may be  exempt  from  federal
income taxes.  The tax  equivalent  yield is computed by taking the portion of
the  Portfolio's  effective  yield exempt from regular  federal income tax and
multiplying  the  exempt  yield by a factor  based  upon a stated  income  tax
rate,  then adding the  portion of the yield that is not exempt  from  regular
federal  income tax. 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
seven-day period ended December 31, 1998, the Money Market  Portfolio's  Class
O tax  equivalent  yield,  for an  investor  in the  36%  federal  income  tax
bracket was 3.17% and, for the 39.6% federal  income tax bracket,  3.36%.  For
the  seven-day  period ended  December 31,  1998,  the Money Market  Portfolio
Institutional  Class'  tax  equivalent  yield,  for an  investor  in  the  36%
federal  income tax bracket was 3.47% and,  for the 39.6%  federal  income tax
bracket, 3.68%. Class T was not available on December 31, 1998.

Limited-Term Portfolio
         From time to time, the Limited-Term  Portfolio  advertises its "total
return." Total return is calculated  separately  for each class.  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.
Total  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.  All total return quotations  reflect the deduction of
the  Portfolio's  maximum sales charge,  except  quotations of "return without
maximum  load"  which do not deduct  the sales  charge  and  "actual  return,"
which  reflect  deduction  of the sales  charge only for those  periods when a
sales charge was actually  imposed.  Thus,  in the formula  below,  for return
without maximum load, P = the entire $1,000  hypothetical  initial  investment
and does not reflect the deduction of any sales charge;  for actual return,  P
= a hypothetical  initial  payment of $1,000.  Note:  "Total Return" as quoted
in the  Financial  Highlights  section  of the  Fund's  Prospectus  and Annual
Report to Shareholders,  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 indicated are as follows:

                  With Max. Load        W/O Max. Load

One Year          2.82%                 2.04%
Five Years        3.70%                 3.91%
Ten Years         4.75%                 4.86%

         The Limited-Term  Portfolio also  advertises,  from time to time, its
"yield" and "tax equivalent  yield." As with total return,  both yield figures
are historical and are not intended to indicate future performance.
         Unlike the yield quotations for the Money Market  Portfolio,  "yield"
quotations  for the  Limited-Term  Portfolio  refer to the  aggregate  imputed
yield-to-maturity  of each of the Portfolio's  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.  The  Limited-Term  Portfolio's  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.  Using this  calculation,  the Limited-Term  Portfolio's yield for
the month ended December 31, 1998 was 3.58%.
         The tax  equivalent  yield is the yield an investor would be required
to obtain  from  taxable  investments  to equal the  Limited-Term  Portfolio's
yield,  all or a portion of which may be exempt  from  federal  income  taxes.
The tax  equivalent  yield is computed for each class by taking the portion of
the yield exempt from regular  federal income tax and  multiplying  the exempt
yield by a factor  based  upon a stated  income  tax  rate,  then  adding  the
portion of the yield that is not exempt from regular  federal  income tax. 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  Portfolio's  tax equivalent  yield was 5.59% for an investor in the
36%  federal  income  tax  bracket,  and  5.93% for an  investor  in the 39.6%
federal income tax bracket.

- ------------------------------------------------------------------------------
                                 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  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 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.

- ------------------------------------------------------------------------------
                            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 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.
         Each   of   the   above   directors/trustees   and   officers   is  a
director/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,  Ms.  Krumsiek  and Ms.  Kruvant  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 Ms. Krumsiek and Mr. Martini are among the directors.
         The  Audit  Committee  of the Board 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  1998,  Trustees  of the Fund not  affiliated  with the Fund's
Advisor were paid  $169,091  and $57,879 by the Money Market and  Limited-Term
Portfolios,  respectively.  Trustees  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  of the Calvert  Group of Funds plus a fee of $750 to
$1500 for each Board and Committee meeting  attended;  such fees are allocated
among the Funds on the basis of their 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. $24,732           $0                $39,550
Frank H. Blatz, Jr.   $25,797           $25,797           $42,100
Frederick T. Borts    $23,674           $0                $33,250
Charles E. Diehl      $25,803           $25,803           $41,500
Douglas E. Feldman    $25,797           $0                $36,250
Peter W. Gavian       $25,804           $12,902           $36,250
John G. Guffey, Jr.   $24,768           $0                $62,665
M. Charito Kruvant    $25,797           $15,477           $36,250
Arthur J. Pugh        $25,797           $0                $41,500
D. Wayne Silby        $24,739           $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.

- ------------------------------------------------------------------------------
                              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  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  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  Trustees.  For its  services,  the  Advisor  receives an
annual fee of:
         i) with  respect to the Money  Market  Portfolio,  prior to August 1,
1997,  the fees  were  0.50% of the first  $500  million  of such  Portfolio's
average daily net assets,  0.45% of the next $500 million of such assets,  and
0.40% of all such  assets  over $1  billion.  Effective  August 1,  1997,  the
fees  changed to 0.25% of the first $500 million of such  Portfolio's  average
daily net assets,  0.20% of the next $500  million of such  assets,  and 0.15%
of all such assets over $1 billion; and
         ii) with respect to the  Limited-Term  Portfolio,  0.60% of the first
$500 million of the  Portfolio's  average daily net assets,  0.50% of the next
$500 million of such assets, and 0.40% of all such 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.
         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.
         The  Advisor  may   voluntarily   reimburse   the  Money  Market  and
Limited-Term  Portfolios  for  expenses.  The advisory  fees paid by the Money
Market  Portfolio  to  Calvert  Asset  Management   Company  were  $7,776,716,
$5,409,090,  and $3,109,517 for years 1996, 1997, and 1998, respectively.  The
advisory fees paid by the  Limited-Term  Portfolio to Calvert Asset Management
Company were  $3,110,764,  $3,164,772,  and $3,048,758  for years 1996,  1997,
and 1998, respectively.

- ------------------------------------------------------------------------------
                           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.  Prior to August 1,
1997,  CASC received a fee of $200,000 per year for providing  such  services,
allocated  among  Portfolios  based on assets.  Effective  August 1, 1997, the
Money Market  Class O,  Institutional  Class,  and Class T pay annual rates of
0.26%,  0.05%,  and 0.25%  respectively,  based on average  daily net  assets.
Limited-Term  and  other  portfolios  of CTFR pay an  annual  fee of  $80,000,
allocated  among  the  portfolios  based on  average  daily  net  assets.  The
service  fees paid by the Money  Market  Portfolio  to Calvert  Administrative
Services  Company were $128,255 for fiscal year 1996. The 1997  administrative
services  fees paid by CTFR Money  Market  were  $1,682,754  and  $24,010  for
Class O and the Institutional  Class,  respectively.  The 1998  administrative
services  fees paid by CTFR Money  Market  were  $1,682,754  and  $24,010  for
Class O and the Institutional Class,  respectively.  Class T was not available
during fiscal year 1998. The service fees paid by the  Limited-Term  Portfolio
to CASC were $38,242,  $43,210,  and $41,317,  for years 1996, 1997, and 1998,
respectively.

- ------------------------------------------------------------------------------
                  TRANSFER AND SHAREHOLDER SERVICING AGENTS
- ------------------------------------------------------------------------------

         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., 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 fee based on the  number of  shareholder  accounts  and  shareholder
transactions, per Portfolio.

- ------------------------------------------------------------------------------
                    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,  MA 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 Portfolios have entered into a principal  underwriting  agreement
with  Calvert  Distributors  Inc.  ("CDI").  Pursuant  to the  agreement,  CDI
serves as distributor  and principal  underwriter  for the  Portfolios.  Under
the terms of the  agreement,  CDI is  entitled  to  receive a service  fee and
distribution   fee  from  the  Money  Market   Portfolio,   paid  through  the
Distribution Plan of Class T.
         Pursuant  to Rule  12b-1  under  the 1940  Act,  Class T of the Money
Market  Portfolio has adopted a  Distribution  Plan (the "Plan") which permits
it to pay certain  expenses  associated with the distribution and servicing of
its shares.  Such expenses may not exceed,  on an annual  basis,  0.25% of the
average daily net assets of Class T.
         The  Distribution  Plan  was  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 Plan or in any agreements  related
to the  Plan.  The  selection  and  nomination  of the  Trustees  who  are not
interested  persons  is  committed  to the  discretion  of such  disinterested
Trustees.  In establishing the Plan, the Trustees  considered  various factors
including the amount of the  distribution  expenses.  The Trustees  determined
that there is a reasonable  likelihood  that the Plan will benefit Class T and
its shareholders.
         The  Plan  may  be   terminated   by  vote  of  a  majority   of  the
non-interested  Trustees who have no direct or indirect  financial interest in
the Plan, or by vote of a majority of the  outstanding  shares of the affected
class or  Portfolio.  Any  change in the Plan that would  materially  increase
the  cost  to  the  affected  Class  of  Portfolio  requires  approval  of the
shareholders  of  that  class;  otherwise,  the  Plan  may be  amended  by the
Trustees,  including a majority of the  non-interested  Trustees as  described
above.  The Plan  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  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
Trustees.
         Apart from the Plan,  the Advisor and CDI, at their own expense,  may
incur costs and pay expenses  associated  with the  distribution  of shares of
the Money Market Portfolio.
         Prior  to the  termination  of Class C shares  for the  Limited  Term
Portfolio,  CDI was entitled to receive a service fee and a distribution  fee,
payable monthly pursuant to the Limited-Term  Portfolio's  Distribution  Plan,
of 0.25%,  respectively,  of the  Portfolio's  average  daily net assets.  CDI
also  receives all sales charges  imposed on  Limited-Term  Portfolio  Class A
shares and  compensates  broker-dealer  firms for sales of shares at a maximum
commission  rate of  1.50%,  as  specified  in the table of  applicable  sales
charges (see "Alternative Sales Options" in the Prospectus).
         For the fiscal years ended  December 31, 1996,  1997,  and 1998,  CDI
received  no sales  charges  in excess  of the  dealer  reallowance.  CDI paid
$48,520,  $101,072,  and $129,017, in addition to commissions charged on sales
of  Limited-Term  Portfolio,   during  fiscal  years  1996,  1997,  and  1998,
respectively.

- ------------------------------------------------------------------------------
                            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  Fund's  Advisor  under the
direction and supervision of the Fund's Board of Trustees.
         For  the  fiscal  years  ended   December  31,  1997  and  1998,  the
portfolio  turnover  rates  of the  Limited-Term  Portfolio  were 52% and 45%,
respectively.  Broker-dealers who execute portfolio  transactions on behalf of
Limited-Term  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   Limited-Term   or  who  provide
Limited-Term  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.  In fiscal years 1996,  1997, and 1998, no commissions
were paid to any officer,  trustee or Advisory  Council  member of the Fund or
any of their  affiliates.  For the  Limited-Term  Portfolio,  1996,  1997, and
1998,  aggregate  brokerage  commissions paid to broker-dealers  were $48,520,
$0, and $0, respectively.
         The Advisor may also execute  portfolio  transactions with or through
broker-dealers  who have sold  shares of  Limited-Term.  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  Limited-Term  shares  sold.  The Advisor may  compensate,  at its expense,
such  broker-dealers in consideration of their promotional and  administrative
services.

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

         The Fund was organized as a  Massachusetts  business trust on October
20,  1980.  The other  series of the Fund  include  the  Long-Term  Portfolio,
California Money Market Portfolio,  and the Vermont Municipal  Portfolio.  The
Fund's  Declaration  of Trust  contains an express  disclaimer of  shareholder
liability  for  acts  or  obligations  of  the  Fund.  The  shareholders  of a
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.
         Each  share  of  each  series   represents  an  equal   proportionate
interest  in that  series  with  each  other  share  and is  entitled  to such
dividends  and  distributions  out of the income  belonging  to such series as
declared by the Board.  The Money Market  Portfolio offers Class O (offered in
the Calvert  Tax-Free  Reserves Money Market  Prospectus),  the  Institutional
Class (offered in a separate  prospectus),  and Class T (offered in a separate
prospectus).  The three classes  represent  interests in the same portfolio of
investments  and are  identical in all respects,  except:  (a) the classes may
have different  transfer  agency fees; (b) postage and delivery,  printing and
stationery  expenses  will be separately  allocated;  and (c) the classes will
have  different  dividend  rates  due  solely  to the  effects  of (a) and (b)
above.  Each class represents  interests in the same portfolio of investments.
Upon any  liquidation  of the Funds,  shareholders  of each class are entitled
to share pro rata in the net assets  belonging  to that series  available  for
distribution.
         General costs,  expenses,  and  liabilities of the Fund  attributable
to a particular Portfolio are borne by that Portfolio;  costs,  expenses,  and
liabilities not attributable to a particular  Portfolio are allocated  between
the  Fund's  Portfolios  on the  basis of the  respective  net  assets of each
Portfolio.
         The Portfolios  will send their  shareholders  unaudited  semi-annual
and audited annual reports that will include the  Portfolios'  net asset value
per share,  portfolio  securities,  income and expenses,  and other  financial
information.
         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 February 25, 1999, the following  shareholders  owned of record
5% or more of the Class or Portfolio shown:

         Name and Address                        % of Ownership

         Wilmington Trust Co.
         FBO Diebold Inv. Co.
         Wilmington, Delaware                    19.63%,      Money     Market
Portfolio, Class I

         David Mastran
         Arlington, Virginia                     16.59%,      Money     Market
Portfolio, Class I

         The Grocers Supply Co., Inc.
         Houston, Texas                          11.45%,      Money     Market
Portfolio, Class I

         Pennsylvania Power & Light Co.
         Allentown, Pennsylvania                 11.12%,      Money     Market
Portfolio, Class I

         Analysts International Corporation
         Minneapolis, Minnesota                  7.27%,      Money      Market
Portfolio, Class I

         Desko Family Limited Partnership
         Latrobe, Pennsylvania                   6.70%,      Money      Market
Portfolio, Class I

         George and Janet Desko
         Latrobe, Pennsylvania                   6.69%,      Money      Market
Portfolio, Class I

         Maximus, Inc.
         McLean, Virginia                        5.89%,      Money      Market
Portfolio, Class I



- ------------------------------------------------------------------------------
                                   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. 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 CDI 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






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