CALVERT CASH RESERVES
485BPOS, 1998-01-23
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SEC Registration Nos.
2-76527 and 811-3418

                       SECURITIES AND EXCHANGE COMMISSION
                             Washington, D.C. 20549

                                   FORM N-1A

REGISTRATION STATEMENT UNDER THE
SECURITIES ACT OF 1933

         Post-Effective Amendment No. 22                       XX 

                                     and/or

REGISTRATION STATEMENT UNDER THE
INVESTMENT COMPANY ACT OF 1940

         Amendment No. 22                             XX 


                             Calvert Cash Reserves
               (Exact Name of Registrant as Specified in Charter)

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

                 Registrant's Telephone Number: (301) 951-4800

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


It is proposed that this filing will become effective

      Immediately upon filing               XX  on January 31, 1998
pursuant to paragraph (b)                   pursuant to paragraph (b)

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

of Rule 485.

<PAGE>
                             Calvert Cash Reserves
                        Form N-1A Cross Reference Sheet

Item number                    Prospectus Caption

        1.                     Cover Page
        2.                     Fund Expenses
        3.                     Financial Highlights
                               Yield
        4.                     Investment Objective and Policies
        5.                     Management of the Fund
        6.                     Management of the Fund
                               Management of the Fund
                               Dividends, and Taxes
        7.                     How to Buy Shares
                               Management of the Fund Share Price
                               When Your Account Will Be Credited
                               Exchanges
        8.                     How to Sell Your Shares
        9.                     *

                               Statement of Additional Information Caption

        10.                    Cover Page
        11.                    Table of Contents
        12.                    General Information
        13.                    Investment Objective and Policies
                               Investment Restrictions
        14.                    Trustees and Officers
        15.                    Trustees and Officers
        16.                    Investment Advisor
                               Independent Accountants and Custodians
                               Method of Distribution
        17.                    Portfolio Transactions
        18.                    General Information
        19.                    Purchase and Redemption of Shares
                               Valuation of Shares
        20                     Dividends and Taxes
        21.                    Method of Distribution
        22.                    Calculation of Yield
        23.                    Financial Statements

*  Inapplicable or negative answer

<PAGE>

   
PROSPECTUS January 31, 1998
    

Calvert Cash Reserves
Institutional Prime Fund

4550 Montgomery Avenue, Bethesda, Maryland 20814


Investment Objective and Policies
CALVERT CASH RESERVES Institutional Prime Fund (the "Fund") is a money market
fund which seeks to obtain the highest level of current income, consistent
with safety, preservation of capital and liquidity that is available through
investments in specified money market instruments. The Fund's assets are
invested in certificates of deposit of major banks, prime commercial paper and
high-grade short-term corporate obligations, and short-term US Government and
agency securities. The investments mature in 13 months or less, with an
average weighted maturity of 90 days or less. The Fund seeks to maintain a
constant net asset value of $1.00 per share for the Fund. It is an operating
policy of the Fund that it will not invest in A2/P2 commercial paper. An
investment in the Fund is neither insured nor guaranteed by the US Government.
There can be no assurance that the Fund will be successful in maintaining a
constant net asset value of $1.00 per share.


To Open An Account
Complete and return the enclosed Account Application. Minimum initial
investment is $1,000,000.


About This Prospectus
Please read this Prospectus before investing. It is designed to provide you
with information you ought to know before investing and to help you decide if
the Fund's goals match your own. Keep this document for future reference.

   
A Statement of Additional Information ("SAI")(dated January 31, 1998) for the
Fund has been filed with the Securities and Exchange Commission and is
incorporated by reference. This free Statement is available upon request from
the Fund: 800-317-2274. The Commission maintains a website
(http://www.sec.gov) that contains the SAI, material incorporated by
reference, and other information regarding registrants that file
electronically with the Commission.
    


THESE SECURITIES HAVE NOT BEEN APPROVED OR DISAPPROVED BY THE SECURITIES AND
EXCHANGE COMMISSION OR ANY STATE SECURITIES COMMISSION NOR HAS THE FEDERAL OR
ANY STATE SECURITIES COMMISSION PASSED UPON THE ACCURACY OR ADEQUACY OF THIS
PROSPECTUS. ANY REPRESENTATION TO THE CONTRARY IS A CRIMINAL OFFENSE.

SHARES OF THE FUND ARE NOT DEPOSITS OR OBLIGATIONS OF, OR GUARANTEED OR
ENDORSED BY, ANY BANK, AND ARE NOT FEDERALLY INSURED BY THE FDIC, THE FEDERAL
RESERVE BOARD, OR ANY OTHER AGENCY.


FUND EXPENSES

A.       Shareholder Transaction Expenses   Institutional Prime Fund

         Sales Load on Purchases                 None
         Sales Load on Reinvested Dividends      None
         Deferred Sales Load                     None
         Redemption Fees                         None
         Exchange Fee                            None


B.       Annual Fund Operating Expenses - Fiscal Year 1997
         (as a percentage of average net assets)

         Management Fees (net of fee waiver)     0.09%
         Rule 12b-1 Fees                         None
         Other Expenses                          0.07%
         Total Fund Operating Expenses           0.16%


C.       Example:
         You would pay the following expenses on a $1,000 investment, assuming
(1) 5% annual return; and (2) redemption at the end of each period:

         1 Year   3 Years  5 Years  10 Years

         $2       $5       $9       $20

         The example, which is hypothetical, should not be considered a
representation of past or future expenses. Actual expenses may be higher or
lower than those shown.

         Explanation of Table: The purpose of the table is to assist you in
understanding the various costs and expenses that an investor in the Fund may
bear directly (shareholder transaction costs) or indirectly (annual fund
operating expenses).


Shareholder Transaction Expenses
are charges you pay when you buy or sell shares of the Funds. If you request a
wire redemption of less than $50,000, you may be charged a $5 wire fee.

   
Annual Fund Operating Expenses
have been restated to reflect expenses anticipated in the current fiscal year.
Management Fees are paid by the Fund to Calvert Asset Management Company, Inc.
(the "Advisor") for managing its investments and business affairs and are
shown net of the Advisor's voluntary fee waiver. Management fees include the
administrative service fee paid to Calvert Administrative Services Company.
The Fund incurs Other Expenses for maintaining shareholder records, furnishing
shareholder statements and reports, and other services. Management Fees and
Other Expenses have already been reflected in the Fund's yield and are not
charged directly to individual shareholder accounts. Please refer to the
section "Management of the Fund" for further information. If the Advisor had
not waived fees, Management Fee would have been 0.30% and Total Fund Operating
Expenses would have been 0.37% for the most recent fiscal year.
    


FINANCIAL HIGHLIGHTS

The following table provides information about the Fund's financial history.
It expresses the information in terms of a single share outstanding throughout
each period. The table has been audited by those independent accountants whose
reports are included in the Annual Reports to Shareholders. The table should
be read in conjunction with the financial statements and their related notes.
The current Annual Report to Shareholders is incorporated by reference into
the SAI.


                                    Year Ended Sept. 30,

Calvert Cash Reserves               1997     1996     1995     1994      1993

Net asset value, beginning of year  $1.00   $1.00   $ 1.00    $1.00    $ 1.00
Income from investment operations
   Net investment income            .055     .040     .045     .028      .025
Distributions to shareholders
   Dividends from net
     investment income             (.055)   (.040)   (.045)    (.028)   (.025)
Net asset value, end of year     $  1.00   $ 1.00   $ 1.00   $ 1.00    $ 1.00
Total return1                       5.55%    3.99%    4.55%    2.78%     2.59%
Ratio to average net assets:
   Net investment income            5.55%    4.80%    4.53%    2.75%     2.48%
   Total expenses2                  0.07%    0.73%    1.41%    -         -
   Net expenses                     0.06%    0.69%    1.39%    1.23%     .92%
   Expenses reimbursed &/or waived  0.31%    0.47%    -         -        -
Net assets, end of year 
   (in thousands)                $ 375,351  $131,218 $26,775  $99,973  $102,235
Number of shares outstanding
at end of year (in thousands)      375,353  131,217   26,821  100,024   102,370


                                    Year Ended Sept. 30,

Calvert Cash Reserves               1992     1991     1990     1989      1988

Net asset value, beginning of year  $1.00  $1.00    $1.00    $1.00     $ 1.00
Income from investment operations
   Net investment income            .037     .061     .074     .083      .067
Distributions to shareholders
   Dividends from net
    investment income              (.037)   (.061)   (.074)    (.083)   (.067)
Net asset value, end of year     $  1.00   $ 1.00   $ 1.00   $ 1.00    $ 1.00
Total return1                       3.72%    6.27%    7.71%    8.69%     6.99%
Ratio to average net assets:
   Net investment income            3.69%    6.09%    7.45%    8.27%     6.44%
   Total expenses2                  -        -        -        -         -
   Net expenses                     .87%     .93%     .96%     .91%      .87%
   Expenses reimbursed &/or waived  -        -        .13%     .12%      .25%
Net assets, end of year 
     (in thousands)               $106,851  $119,316 $117,684 $156,777 $91,640
Number of shares outstanding
at end of year (in thousands)      106,897  119,362   117,699 156,797   91,660

1. Total return prior to 1989 is not audited.

2. Effective September 30, 1995, this ratio reflects total expenses before
reduction for fees paid indirectly; such reductions are included in the ratio
of net expenses.

INVESTMENT OBJECTIVE AND POLICIES

Investment Objective: The Fund seeks to earn the highest level of current
income, consistent with preservation of capital and liquidity.

Calvert Cash Reserves Institutional Prime Fund is a diversified money market
fund. Its objective is to earn the highest level of current income, consistent
with safety, preservation of capital and liquidity, that is available through
investment in specified money market instruments. The Fund's assets are
invested in securities maturing in 13 months or less, and it maintains an
average weighted maturity of 90 days or less. It is the operating policy of
the Fund to invest in first-tier securities, according to Rule 2a-7 of the
Investment Company Act of 1940.

Institutional Prime Fund invests primarily in Top-Tier Securities.
The Fund's assets are invested in high-quality short-term investments
including US Government and agency or instrumentality securities, certificates
of deposit of major banks, commercial paper, eligible high-grade short-term
corporate obligations, including participation interests in loans extended to
issuers of such obligations, repurchase agreements, bankers acceptances,
floating rate notes and variable-rate demand notes and taxable municipal
securities. The Fund may invest in high-quality, US dollar denominated
international money market investments and may invest up to 5% of its total
assets in reverse repurchase agreements. It is the operating policy of the
Fund to invest only in tier-one securities as defined by Rule 2a-7 of the
Investment Policy Act of 1940. It is a further operating policy of the Fund
that it will invest only in issues rated A-1 or P-1 or better, or, if not
rated, of equivalent quality. The Fund will not invest in A-2 or P-2 rated
issues. See the SAI, "Appendix, Commercial Paper and Bond Ratings."

Other Policies
The Fund has adopted certain fundamental investment restrictions which are
discussed in detail in the SAI. Unless specifically noted otherwise, the
investment objective, policies and restrictions of the Fund are fundamental
and may not be changed without shareholder approval. There can be no assurance
that the Fund will be successful in meeting its investment objective.

Purchasing obligations for future delivery or on a "when-issued" basis may
increase the Fund's overall investment exposure and involves a risk of loss if
the value of the securities declines prior to the settlement date. The
transactions are fully secured at all times.

YIELD

Yield refers to income generated by an investment over a period of time.
From time to time, the Fund may advertise "yield" and "effective yield." Yield
figures are based on historical earnings and are not intended to indicate
future performance. The "yield" refers to the actual income generated by an
investment in the Fund over a particular base period, stated in the
advertisement. If the base period is less than one year, the yield will be
"annualized." That is, the amount of income generated by the investment during
the base period is assumed to be generated over a one-year period and is shown
as a percentage of the investment. The "effective yield" is calculated
similarly, but, when annualized, the income earned by an investment in the
Fund is assumed to be reinvested. The "effective yield" will be slightly
higher than the "yield" because of the compounding effect of this assumed
reinvestment.

MANAGEMENT OF THE FUND

The Board of Trustees supervises the activities and reviews its contracts with
companies that provide the Fund with services.
The Fund is a Massachusetts business trust organized on March 16, 1982. Prior
to June 30, 1996, Calvert Cash Reserves was doing business as Money Management
Plus. In October 1992, Prime Portfolio began offering a second class of
shares, the CCR Prime Shares, which was discontinued during 1994.

The Fund is an open-end diversified management investment company. The Fund is
not required to hold annual shareholder meetings, but special meetings may be
called for certain purposes such as electing (or removing) Trustees, changing
fundamental policies, or approving a management contract. As a shareholder,
you receive one vote for each share you own (with proportionate voting for
fractional shares).

   
Calvert Group is one of the largest investment management firms in the
Washington, D.C. area.
Calvert Group, Ltd., parent of the Fund's investment advisor, shareholder
servicing agent, and distributor, is a subsidiary of Acacia Mutual Life
Insurance Company of Washington, D.C. Calvert Group is one of the largest
investment management firms in the Washington, D.C. area. Calvert Group, Ltd.
and its subsidiaries are located at 4550 Montgomery Avenue, Suite 1000N,
Bethesda, Maryland 20814. As of December 31, 1997, Calvert Group managed and
administered assets in excess of $5. billion and more than ,000 shareholder
and depositor accounts.
    

Calvert Asset Management serves as Advisor to the Funds.
Calvert Asset Management Company, Inc. (the "Advisor") is the Fund's
investment advisor. The Advisor provides the Fund with investment supervision
and management; administrative services and office space; furnishes executive
and other personnel to the Fund; and pays the salaries and fees of all
Trustees who are affiliated persons of the Advisor. The Advisor may also
assume and pay certain advertising and promotional expenses of the Fund and
reserves the right to compensate broker/dealers in return for their
promotional or administrative services.

   
The Advisor receives a fee based on a percentage of the Fund's assets.
The Fund pays the Advisor an advisory fee of 0.25% of its average daily net
assets pursuant to the Investment Advisory Agreement. However, the Advisor
voluntarily waived all of its fee for fiscal year 1997.

Calvert Administrative Services Company provides administrative services for
the Fund.
Calvert Administrative Services Company ("CASC"), an affiliate of the Advisor,
provides certain administrative services to the Fund, including the
preparation of regulatory filings and shareholder reports, the daily
determination of its net asset value per share and dividends, and the
maintenance of its portfolio and general accounting records. For providing
such services, CASC is entitled to an annual fee of 0.05% of the Fund's
average daily net assets. During fiscal year 1996 and 1997, CASC voluntarily
waived all fees.
    

Calvert Distributors, Inc. serves as underwriter to market the Fund's shares.
Calvert Distributors, Inc. ("CDI") is the Fund's principal underwriter and
distributor. Under the terms of its underwriting agreement with the Fund, CDI
markets and distributes the Fund's shares and is responsible for preparing
advertising and sales literature, and printing and mailing of prospectuses to
prospective investors. CDI does not receive any compensation from the Fund.

   
The transfer agent keeps your account records and the shareholder servicing
agent answers shareholders' questions.
National Financial Data Services, Inc. ("NFDS"), 1004 Baltimore, Kansas City,
Missouri, 64105, is the Fund's transfer agent and dividend paying agent.
Calvert Shareholder Services, Inc. is the Fund's shareholder servicing agent.
    

SHAREHOLDER GUIDE

Opening An Account
You can buy shares of the Fund in several ways which are described here and in
the chart below.
An account application accompanies this prospectus. A completed and signed
application is required for each new account you open. Additional forms may be
required from corporations, associations, and certain fiduciaries. If you have
any questions or need extra applications, call Calvert Group at 800-317-2274.

Share Price
The Fund's shares are sold without a sales charge.
The price of one share is its "net asset value," or NAV. NAV is computed by
adding the value of a Fund's investments plus cash and other assets, deducting
liabilities and then dividing the result by the number of shares outstanding.
The NAV is calculated at the close of the Fund's business day, which coincides
with the closing of the regular session of the New York Stock Exchange
(normally 4:00 p.m. Eastern time). The Fund is open for business each day the
New York Stock Exchange is open. The Fund's securities are valued according to
the "amortized cost" method, which is intended to stabilize the NAV at $1.00
per share.

All purchases of Fund shares will be confirmed and credited to your account in
full and fractional shares (rounded to the nearest 1/100 of a share). The Fund
may send monthly statements in lieu of immediate confirmations of purchases
and redemptions.

HOW TO BUY SHARES

Method                     Initial investment        Additional Investments

BY WIRE                    $1,000,000 minimum        No minimum
     ABA# 011000028 FBO: Calvert Cash Reserves Fund 707 Wire Account
     Wire investments to: State Street Bank and Trust Company, Boston, MA
     #9903-765-7 Client's name and account number

BY EXCHANGE                $1,000,000 minimum        No minimum
(FROM YOUR ACCOUNT IN ANOTHER CALVERT GROUP FUND)
     When opening an account by exchange, your new account must be established
taxpayer with the same name(s), address and identification number as your
existing Calvert account.

WHEN YOUR ACCOUNT WILL BE CREDITED

Before you buy shares, please read the following information to make sure your
investment is accepted and credited properly.

Your purchase will be processed at the NAV calculated after your order is
received and accepted. A telephone order placed to Calvert Institutional
Marketing Group by 1:00 p.m. Eastern time will receive the dividend on Fund
shares declared that day if federal funds are received by the custodian by 5
p.m. Eastern time. Telephone orders placed after 1:00 p.m. will begin earning
dividends on Fund shares the next business day. If no telephone order is
placed, investments begin earning dividends the next business day. Exchanges
begin earning dividends the next business day after the exchange request is
received by mail or telephone.

All of your purchases must be made by wire. No cash or checks will be
accepted. The Fund reserves the right to suspend the offering of shares for a
period of time or to reject any specific purchase order.

EXCHANGES

Each exchange represents the sale of shares of one Fund and the purchase of
shares of another.
If your investment goals change, the Calvert Group Family of Funds has a
variety of investment alternatives that includes common stock funds,
tax-exempt and corporate bond funds, and money market funds. The exchange
privilege is a convenient way to buy shares in other Calvert Group Funds in
order to respond to changes in your goals or in market conditions. Before you
make an exchange from a Fund or Portfolio, please note the following:

         Call the Calvert Institutional Marketing Group for information and a
prospectus for any of Calvert's other Funds registered in your state. Read the
prospectus of the Fund or Portfolio into which you want to exchange for
relevant information.

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

         Shares on which you have already paid a sales charge at Calvert Group
may be exchanged into another Fund at no additional charge. Shares acquired by
reinvestment of dividends or distributions may be exchanged into another Fund
at no additional charge. Except for money market funds, if you make a purchase
at NAV, you may exchange that amount to another fund at no additional sales
charge.

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

OTHER CALVERT GROUP SERVICES

   
Calvert Information Network
24 hour performance and prices
Calvert Group has a round-the-clock telephone service and a website at
http://www.calvertgroup.com that lets existing customers obtain prices,
performance information, and account balances. Complete instructions for this
service may be found on the back of each statement.
    

Telephone Transactions
Calvert may record all telephone calls.
If you have telephone transaction privileges, you may purchase, redeem, or
exchange shares, and wire funds by telephone. You automatically have telephone
privileges unless you elect otherwise. The Fund, the transfer agent, the
shareholder servicing agent and their affiliates are not liable for acting in
good faith on telephone instructions relating to your account, so long as they
follow reasonable procedures to determine that the telephone instructions are
genuine. Such procedures may include recording the telephone calls and
requiring some form of personal identification. You should verify the accuracy
of telephone transactions immediately upon receipt of your confirmation
statement.

Complete the account application for the easiest way to establish services.
The easiest way to establish optional services on your Calvert Group account
is to select the options you desire when you complete your account
application. If you wish to add other options later, you may have to provide
us with additional information and a signature guarantee. Please call the
Calvert Institutional Marketing Group at 800-317-2274 for further assistance.
For our mutual protection, we may require a signature guarantee on certain
written transaction requests. A signature guarantee verifies the authenticity
of your signature, and may be obtained from any bank, savings and loan
association, credit union, trust company, broker/dealer firm or member of a
domestic stock exchange. A signature guarantee cannot be provided by a notary
public.

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

HOW TO SELL YOUR SHARES

You may redeem all or a portion of your shares on any business day. Your
shares will be redeemed at the next NAV calculated after your redemption
request is received and accepted.

Redemption Requirements To Remember
To ensure acceptance of your redemption request, please follow the procedures
described here and below.
Once your shares are redeemed, the proceeds will normally be sent to you on
the next business day, but if making immediate payment could adversely affect
the Fund, it may take up to seven (7) days. When the New York Stock Exchange
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.

Redemption proceeds are normally paid in cash. However, at the sole discretion
of the Fund, the Fund has the right to redeem shares in assets other than cash
for redemption amounts exceeding, in any 90 day period, $250,000 or 1% of the
NAV of the Fund, whichever is less, or as allowed by law.

If you sell shares by telephone or written request, you will receive dividends
through the date the request is received and processed. To better enable the
Advisor to keep the Fund fully invested, Calvert requests that you notify the
Institutional Marketing Group at least 24 hours in advance for any redemption
over $10 million per day.

Minimum account balance
Please maintain a balance in your account of at least $1,000,000. If, due to
redemptions, the account falls below $1,000,000, or you fail to invest at
least $1,000,000, it may be closed and the proceeds mailed to you at the
address of record. You will be given notice that your account will be closed
after 30 days unless you make an additional investment to increase your
account balance to the $1,000,000 minimum.

Telephone
Please call the Institutional Marketing Group at 800-317-2274. You may redeem
shares from your account by telephone and have your money mailed to your
address of record or wired to a bank you have previously authorized. Same-day
wire redemptions may be ordered by calling the Institutional Marketing Group
by noon Eastern time. All other wires will be transmitted the next business
day. A charge of $5 may be imposed on wire transfers of less than $50,000. See
"Telephone Transactions."

Exchange to Another Calvert Group Fund
You must meet the minimum investment requirement of the other Calvert Group
Fund or Portfolio. You can only exchange between accounts with identical
names, addresses and taxpayer identification number, unless previously
authorized with a signature-guaranteed letter.

Mail To: Calvert Institutional Marketing Group, 4550 Montgomery Avenue,
Bethesda, Maryland 20814.
You may redeem available shares from your account at any time by sending a
letter of instruction, including your name, account and Fund number, the
number of shares or dollar amount, and where you want the money to be sent.
The letter of instruction must be signed by all required authorized signers.
If you want the money to be wired to a bank not previously authorized, then a
voided bank check must be enclosed with your letter. If you do not have a
voided check, you must enclose a letter on corporate letterhead, signed by one
or more authorized signers.

DIVIDENDS AND TAXES

Each year, the Fund distributes substantially all of its net investment income
to shareholders.
Dividends from the Fund's net investment income are declared daily and paid
monthly. Net investment income consists of interest income, net short-term
capital gains, if any, and dividends declared and paid on investments, less
expenses.

   
Dividend payment options
Dividends and any distributions are automatically reinvested in additional
shares of the same Fund, unless you elect to have the dividends of $10 or more
paid in cash (by check). Dividends and distributions from the Fund may be
invested in shares of any other Calvert Group Fund or Portfolio with no
additional sales charge. You must notify the Fund in writing to change your
payment options. If you elect to have dividends and/or distributions paid in
cash, and the US Postal Service cannot deliver the check, or if it remains
uncashed for six months, it, as well as future dividends and distributions,
will be reinvested in additional shares. No dividends will accrue on amounts
represented by uncashed distribution or redemption checks.
    

Federal Taxes
In January, the Fund will mail you Form 1099-DIV indicating the federal tax
status of dividends and any capital gain distributions paid to you by the Fund
during the past year. 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 Fund shares. A portion of the
Fund's dividends may qualify for the dividends received deduction for
corporations.

Other Tax Information
In addition to federal taxes, 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 the Fund to withhold 31% of your dividends. In addition, you may be
subject to a fine. You will also be prohibited from opening another account by
exchange. If this TIN information is not received within 60 days after your
account is established, your account may be redeemed at the current NAV on the
date of redemption. The Fund reserves the right to reject any new account or
any purchase order for failure to supply a certified TIN.

<PAGE>

                           Calvert Cash Reserves
                           Institutional Prime Fund

                     Statement of Additional Information
                               January 31, 1998


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

   
SHAREHOLDER SERVICE                   TRANSFER AGENT
Calvert Shareholder Services Inc.     National Financial Data Services, Inc.
4550 Montgomery Avenue                1004 Baltimore
Suite 1000                            6th Floor
Bethesda, Maryland 20814              Kansas City, Missouri 64105
    

PRINCIPAL UNDERWRITER                 INDEPENDENT ACCOUNTANTS
Calvert Distributors, Inc.            Coopers & Lybrand, L.L.P.
4550 Montgomery Avenue                250 West Pratt Street
Suite 1000N                           Baltimore, Maryland 21201
Bethesda, Maryland 20814



                                     TABLE OF CONTENTS
 
                  Investment Objective and Policies                    1
                  Investment Restrictions                              3
                  Purchase and Redemption of Shares                    4
                  Dividends and Taxes                                  5
                  Valuation of Shares                                  6
                  Calculation of Yield                                 6
                  Advertising                                          7
                  Trustees and Officers                                7
                  Investment Advisor                                   10
                  Transfer and Shareholder Servicing Agents            10
                  Independent Accountants and Custodians               11
                  Method of Distribution                               11
                  Portfolio Transactions                               11
                  General Information                                  11
                  Financial Statements                                 12
                  Control Persons and Principal Holders of Securities  12
                  Appendix                                             12


<PAGE>

STATEMENT OF ADDITIONAL INFORMATION-January 31, 1998

                            Calvert Cash Reserves
                           Institutional Prime Fund
               4550 Montgomery Avenue, Bethesda, Maryland 20814

New Account   (800) 368-2748           Shareholder     (800) 368-2745
Information:      (301) 951-4820       Services:       (301) 951-4810
Broker            (800) 368-2746       TDD for the Hearing-
Services:         (301) 951-4850       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 Fund's  Prospectus  dated  January  31,  1998,  which may be obtained
free of charge by writing or calling the Fund.
    

                      INVESTMENT OBJECTIVE AND POLICIES

         Calvert  Cash  Reserves  Institutional  Prime Fund (the  "Fund") is a
money market fund which seeks to obtain the highest  level of current  income,
consistent  with  safety,  preservation  of  capital  and  liquidity,  that is
available   through   investment  in  specified   money  market   instruments.
Currently,  the Fund's  assets  are  invested  in  securities  maturing  in 13
months or less and the Fund  maintains  an  average  weighted  maturity  of 90
days or  less.  Fund  investments  are  valued  at  amortized  cost.  The Fund
intends to maintain a constant  net asset  value of $1.00 per share.  The Fund
invests exclusively in short-term money market instruments.

The Fund will be invested exclusively in:
         (1)  U.S.   dollar-denominated   certificates  of  deposit,  bankers'
acceptances  and other  debt  obligations  of U.S.  banks  and their  branches
located  outside of the U.S. and of U.S.  branches of foreign banks,  provided
that the bank has total  assets of at least $1 billion (or the  equivalent  in
other  currencies)  or, if its total  assets  are less  than $1  billion,  the
principal  amount  of such  obligation  is  insured  in  full  by the  Federal
Deposit Insurance Corporation;
         (2)  commercial  paper of both domestic and foreign  issuers which at
the date of  investment  is rated  A-1 by  Standard  & Poor's  Corporation  or
Prime-1 by Moody's Investors Service,  Inc., or, if unrated,  is of comparable
quality as  determined by the Advisor  under the  supervision  of the Board of
Trustees;
         (3)  short-term  (one  year or less)  corporate  obligations  of both
domestic and foreign  issuers  which at the date of  investment  are rated AAA
or AA by  Standard & Poor's or Aaa or Aa by  Moody's  or, if  unrated,  are of
comparable  quality as determined by the Advisor under the  supervision of the
Board of Trustees;
         (4)  obligations  issued or  guaranteed  as to principal and interest
by the U.S.  Government,  its  agencies and  instrumentalities,  or by foreign
governments,  their  agencies  and  instrumentalities,   or  by  international
agencies and instrumentalities; and
         (5)  such   obligations   subject  to  repurchase   agreements   with
recognized securities dealers and banks.

         While the Fund invests only in  high-grade,  short-term  money market
instruments,  there  can be, of  course,  no  assurance  that the Fund will be
successful in meeting its  investment  objective or in  maintaining a constant
net asset value of $1.00 per share  because  there are  inherent  risks in the
ownership  of any  investment.  An increase in interest  rates will  generally
reduce the value of Fund  investments,  and a decline in  interest  rates will
generally  increase the value of Fund investments.  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.  Dividends
paid by the Fund will fluctuate as interest  rates and net  investment  income
fluctuate.   The  Fund  will   attempt,   through   careful   management   and
diversification,  to reduce  these  risks and enhance  the  opportunities  for
higher income and greater price stability.

Repurchase Agreements
         The Fund engages in  repurchase  agreements in order to earn a higher
rate of return  than it could  earn  simply  by  investing  in the  obligation
which is the subject of the repurchase  agreement.  Repurchase  agreements are
not, however, without risk.
         In the  event  of the  bankruptcy  of a seller  during  the term of a
repurchase  agreement,  a legal  question  exists as to whether the Fund would
be deemed  the owner of the  underlying  security  or would be deemed  only to
have a security  interest in and lien upon such  security.  The Fund will only
engage in repurchase  agreements with recognized  securities dealers and banks
determined to present  minimal  credit risk by the Advisor under the direction
and  supervision  of the Fund's Board of Trustees.  Repurchase  agreements are
always  for  periods  of less  than one year and no more  than 10% of a Fund's
net assets may be invested in  repurchase  agreements  not  terminable  within
seven days.
         In  addition,  the Fund will only  engage  in  repurchase  agreements
reasonably  designed  to secure  fully  during the term of the  agreement  the
seller's  obligation to repurchase  the  underlying  security and will monitor
the  market  value  of  the  underlying   security  during  the  term  of  the
agreement.  If the value of the  underlying  security  declines  and is not at
least equal to the  repurchase  price due the Fund pursuant to the  agreement,
the Fund will require the seller to pledge  additional  securities  or cash to
secure the  seller's  obligations  pursuant  to the  agreement.  If the seller
defaults  on its  obligation  to  repurchase  and the value of the  underlying
security  declines,  the  Fund  may  incur a loss and may  incur  expenses  in
selling the underlying security.

Reverse Repurchase Agreements
         The Fund may also engage in reverse  repurchase  agreements.  Under a
reverse  repurchase  agreement,  the Fund  sells its  securities  to a bank or
securities  dealer and agrees to repurchase  those  securities from such party
at an agreed upon date and price  reflecting  a market rate of  interest.  The
Fund  invests  the  proceeds  from  each  reverse   repurchase   agreement  in
obligations  in which it is  authorized  to invest.  The Fund intends to enter
into a reverse  repurchase  agreement only when the interest  income  provided
for in the  obligation  in which the Fund  invests the proceeds is expected to
exceed  the  amount the Fund will pay in  interest  to the other  party to the
agreement,  plus all costs  associated  with the  transactions.  The Fund does
not intend to borrow for  leverage  purposes.  The Fund will only be permitted
to pledge  assets to the extent  necessary  to secure  borrowings  and reverse
repurchase agreements.
         During the time a reverse  repurchase  agreement is outstanding,  the
Fund will maintain in a segregated  custodial  account an amount of cash, U.S.
Government  securities or other liquid,  high-quality debt securities equal in
value to the  repurchase  price.  The Fund will  mark to  market  the value of
assets held in the segregated  account,  and will place  additional  assets in
the account  whenever  the total  value of the account  falls below the amount
required under applicable regulations.
         The Fund's use of reverse  repurchase  agreements  involves  the risk
that the other party to the  agreements  could become subject to bankruptcy or
liquidation  proceedings during the period the agreements are outstanding.  In
such  event,  the Fund may not be able to  repurchase  the  securities  it has
sold to that other party. Under those  circumstances,  if at the expiration of
the  agreement  such  securities  are  of  greater  value  than  the  proceeds
obtained by the Fund under the  agreements,  the Fund may have been better off
had it not  entered  into the  agreement.  However,  the Fund will  enter into
reverse  repurchase  agreements  only with banks and dealers which the Advisor
believes present minimal credit risks under  guidelines  adopted by the Fund's
Board of  Trustees.  In  addition,  the Fund  bears the risk  that the  market
value of the  securities  sold by the Fund may decline  below the  agreed-upon
repurchase  price,  in which  case the  dealer  may  request  the Fund to post
additional collateral.

International Money Market Instruments
         The  Fund  may  invest  in  U.S.  dollar-denominated  obligations  of
foreign  branches  of U.S.  banks and U.S.  branches of foreign  banks  ("bank
obligations").  Such bank  obligations  may be subject to risks not associated
with  domestically  insured  bank  obligations.   For  example,   foreign  and
domestic bank reserve requirements may differ.
         The Fund may also invest in commercial  paper,  short-term  corporate
obligations,  and  obligations  issued or guaranteed  by foreign  governments,
their  agencies  and  instrumentalities,  or  by  international  agencies  and
instrumentalities,  so long as such  instruments  are U.S.  dollar-denominated
and  meet  the same  credit,  liquidity,  and  concentration  requirements  as
domestic obligations.
         The bank  obligations  and other money market  instruments of foreign
issuers described above are subject to certain  additional  risks.  Payment of
interest  and  principal  upon these  obligations  and the  marketability  and
liquidity of such  obligations  in the secondary  market may also be adversely
affected  by  governmental  action in the  country of  domicile  of the branch
(generally  referred  to  as  "sovereign  risk").   Examples  of  governmental
actions  would be the  imposition of exchange or currency  controls,  interest
limitations or withholding  taxes on interest  income,  seizure of assets,  or
the  declaration  of a moratorium on the payment of principal or interest.  In
addition,  evidences of ownership  of Fund  securities  may be held outside of
the  U.S.,  and the Fund  may be  subject  to the  risks  associated  with the
holding of such property overseas.
         These  instruments  are not subject to currency  fluctuations,  since
they  are  denominated  in  U.S.  dollars.   The  Advisor  will  consider  the
political and economic conditions in a country,  the location of custody,  and
the  liquidity  in  selecting  such  instruments  for the  Fund.  Also,  as an
operating  policy,  it  will  only  invest  in  bank  obligations  of  foreign
branches  of U.S.  banks if the parent bank  guarantees  the  obligation,  and
where  the  parent  bank  either  has  assets  of  at  least  $1  billion  (or
equivalent  in  other  currencies),  or is  insured  in  full  by the  Federal
Deposit Insurance Corporation.

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."
 
When-Issued Purchases
         Securities  purchased on a when-issued  basis and the securities held
in the Fund 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  Fund  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
Fund's assets may vary. No new when-issued  commitments will be made by a Fund
if more than 50% of that Fund's net assets would become so committed.
         When  the  time  comes to pay for  when-issued  securities,  the Fund
will meet its  obligations  from then available cash flow,  sale of securities
or,  although  it  would  not  normally  expect  to do so,  from  sale  of the
when-issued  securities  themselves  (which may have a market value greater or
less than the Fund'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.

                           INVESTMENT RESTRICTIONS

Fundamental
         The  foregoing  investment  objective  and the  following  investment
restrictions  may not be  changed  without  the  consent  of the  holders of a
majority  of the  Fund's  outstanding  shares,  including  a  majority  of the
shares of the Fund.  Shares have equal rights as to voting.  A majority of the
shares means the lesser of (i) 67% of the shares  represented  at a meeting at
which more than 50% of the  outstanding  shares are  represented  or (ii) more
than 50% of the outstanding shares. The Fund may not:
         (1) Purchase common stocks,  preferred stocks,  warrants, or
         other equity securities;
         (2) Sell securities  short,  purchase  securities on margin,
         or write put or call  options.  The Fund reserves the right,
         without percentage  limitation,  to purchase securities with
         puts attached. See "Obligations with Puts Attached";
         (3) Issue  senior  securities,  borrow  money,  except  from
         banks for  temporary or emergency  purposes and then only in
         an  amount  up to 10% of the  value  of  that  Fund's  total
         assets  and  except  by  engaging   in  reverse   repurchase
         agreements;  provided,  however,  that  the  Fund  may  only
         engage in reverse  repurchase  agreements so long as, at the
         time it enters  into a  reverse  repurchase  agreement,  the
         aggregate  proceeds  from  outstanding   reverse  repurchase
         agreements,  when  added  to  other  outstanding  borrowings
         permitted  by this  section,  do not  exceed  33 1/3% of the
         Fund's  total  assets.  In order  to  secure  any  permitted
         borrowings and,  reverse  repurchase  agreements  under this
         section,  the Fund may pledge,  mortgage or hypothecate  its
         assets;
         (4) Underwrite  the  securities of other issuers,  except to
         the extent  that  either the sale of  restricted  securities
         or the  purchase  of  municipal  obligations  in  accordance
         with the Fund's  investment  objective and policies,  either
         directly  from the  issuer,  or from an  underwriter  for an
         issuer, may be deemed an underwriting;
         (5)  Purchase or sell real  estate,  real estate  investment
         trust  securities,  commodities or commodity  contracts,  or
         oil and gas  interests,  but this shall not prevent the Fund
         from  investing (a) in securities  which are secured by real
         estate or real estate  mortgages,  or (b) in the  securities
         of issuers  which invest or deal in  commodities,  commodity
         futures,   oil,  gas,  or  other  mineral   exploration   or
         development   programs,   real   estate,   or  real   estate
         mortgages;
         (6)  Purchase  or  retain  securities  of an issuer if those
         trustees  of the  Fund,  each of whom  owns more than 1/2 of
         1% of the  outstanding  securities of such issuer,  together
         own more than 5% of such outstanding securities;
         (7) Make  loans to  others,  except in  accordance  with the
         Fund's  investment  objective  and  policies,  such  as  the
         purchase  of an issue of debt  securities  in which the Fund
         is   authorized   to  invest,   or  pursuant  to   contracts
         providing  for the  compensation  of  service  providers  by
         compensating balances;
         (8)  Invest  in  companies  for the  purpose  of  exercising
         control;   or  invest  in  securities  of  other  investment
         companies,  except  as  they  may be  acquired  as part of a
         merger,  consolidation  or  acquisition  of  assets,  or  in
         connection    with    a    director's/trustee's     deferred
         compensation  plan,  as long as there is no  duplication  of
         advisory fees;
         (9)  Invest  25%  or  more  of  its  total   assets  in  any
         particular  industry  or  industries,  except  that the Fund
         may  invest 25% or more of its total  assets in  obligations
         issued or  guaranteed by the U.S.  Government,  its agencies
         or  instrumentalities.  Industrial  development bonds, where
         the   payment   of    principal    and   interest   is   the
         responsibility  of companies  within the same industry,  are
         grouped together as an "industry";
         (10)  Invest  more than 5% of the value of its total  assets
         in  securities  where the payment of principal  and interest
         is the  responsibility  of a company or companies  with less
         than three years' operating history;
         (11)   Purchase   securities   of  any  issuer  (other  than
         obligations   of,  or  guaranteed   by,  the  United  States
         Government,  its  agencies  or  instrumentalities,  a State,
         its political  subdivisions  or  municipalities  or agencies
         thereof)  if, as a result,  (a) more than 5% of the value of
         its total  assets  would be  invested in the  securities  of
         that  issuer,  or (b)  more  than  25% of the  value  of its
         total  assets  would  be  invested  in  the   securities  of
         issuers  in  the  same   industry.   For  purposes  of  this
         restriction  regarding  the Fund only, an investment in U.S.
         banks or U.S.  branches of foreign  banks is not  considered
         an industry;

   
Non-Fundamental
         (12)  No more  than  10% of the  Fund's  net  assets  may be
         invested in illiquid securities;
         (13)      For purposes of  investment  restriction  number 3
              above,  the Fund has no current  intention to allow its
              borrowings  due to  reverse  repurchase  agreements  to
              exceed 5% of total assets.
    

                      PURCHASE AND REDEMPTION OF SHARES

         The  Fund  requires  a  minimum  initial  investment  of  $1,000,000.
Shares  will be held in book  entry  form at the  Fund's  transfer  agent.  No
share certificates will be issued.
         Amounts  redeemed by check  redemption  may be mailed to the investor
without  charge.  Amounts  of  $50,000  or more  will be  transmitted  by wire
without  charge  by  the  Fund  to  the  investor's   account  at  a  domestic
commercial  bank  that is a  member  of the  Federal  Reserve  System  or to a
correspondent  bank.  A charge of $5 may be imposed on wire  transfers of less
than $50,000.  If the investor's  bank is not a Federal Reserve System member,
failure  of  immediate  notification  to that bank by the  correspondent  bank
could  result  in a delay  in  crediting  the  funds  to the  investor's  bank
account.
         Existing  shareholders who at any time desire to change  instructions
already  given must send a notice  either to the broker  through  which shares
were  purchased  or to the Fund with a voided  check from the bank  account to
receive the redemption  proceeds.  New wiring  instructions may be accompanied
by a voided  check in lieu of a signature  guarantee.  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,
such as a corporate  resolution  is required from  corporations,  fiduciaries,
pension plans, and institutional investors.
         The Fund's  redemption  check normally will be mailed to the investor
on the next  business  day  following  the date of  receipt by the Fund of the
written or telephone  redemption  request. If the investor so instructs in the
redemption  request,  the  check  will be mailed  or the  redemption  proceeds
wired to a predesignated account at the investor's bank.
         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.

                             DIVIDENDS AND TAXES

   
         The Fund declares  dividends  daily and pays them  monthly,  based on
its net  investment  income.  Net investment  income  consists of the interest
income earned on investments  (adjusted for  amortization of original issue or
market  discount or premium),  less expenses.  Realized and  unrealized  gains
and losses are not included in net investment  income.  Net short-term capital
gains will be  distributed  once each year,  although the Fund may  distribute
them more  frequently  if  necessary  in order to maintain  net asset value at
$1.00 per share.  Distributions  of net capital  gains,  if any,  are normally
declared and paid by the Fund once a year;  however,  the Fund does not intend
to make any such  distributions  from securities profits unless available loss
carryovers, if any, have been used or have expired.
         In 1997  the  Fund  did  qualify  and in 1998  the  Fund  intends  to
qualify  as a  "regulated  investment  company"  under  Subchapter  M  of  the
Internal  Revenue  Code as  amended.  By so  qualifying,  the Fund will not be
subject to federal  income  taxes,  nor to the  federal  excise tax imposed by
the  Tax  Reform  Act of  1986,  to the  extent  that it  distributes  its net
investment income and realized capital gains.
         Dividends  and  distributions  are  automatically  reinvested  at net
asset  value in  additional  shares.  Shareholders  may  elect  to have  their
dividends  and  distributions  paid out  monthly  or  quarterly  in cash.  The
Fund's  dividends of net  investment  income and  dividends of net  short-term
capital gains,  whether taken in cash or reinvested in additional  shares, are
taxable to  shareholders  as ordinary income and may qualify for the corporate
dividends-received  deduction.  Net long-term capital gain  distributions,  if
any,  will  generally be  includable  as  long-term  capital gain in the gross
income of  shareholders  who are citizens or  residents of the United  States.
Whether  such  realized  securities  gains and losses are long- or  short-term
depends  on the  period the  securities  are held by the Fund,  not the period
for which the shareholder holds shares of the Fund.
          The Fund will notify  shareholders  annually about the tax status of
dividend  and  distributions  paid by the Fund  and the  amount  of  dividends
withheld,  if any,  during  the  previous  year.  Many  states  do not tax the
portion  of a  Fund's  dividends  which  is  derived  from  interest  on  U.S.
Government  obligations.  State law  varies  considerably  concerning  the tax
status of dividends  derived from U.S.  Government  obligations.  Accordingly,
shareholders  should  consult  their  tax  advisors  about  the tax  status of
dividends and distributions from the Fund in their respective jurisdictions.
         The  Fund  is  required  to  withhold  31% of any  dividends  and any
long-term  capital  gain  dividends,  paid if:  (a) the  shareholder's  social
security  number  or  other  taxpayer  identification  number  ("TIN")  is not
provided or an obviously  incorrect TIN is provided:  (b) the shareholder does
not  certify  under  penalties  of  perjury  that  the  TIN  provided  is  the
shareholder's  correct TIN and that the  shareholder  is not subject to backup
withholding  under section  3406(a)(1)(C) of the Internal Revenue Code because
of  underreporting;  or (c)  the  Fund is  notified  by the  Internal  Revenue
Service  that the TIN provided by the  shareholder  is incorrect or that there
has  been   underreporting  of  interest  or  dividends  by  the  shareholder.
Affected  shareholders  will receive  statements at least annually  specifying
the  amount  of   dividends   withheld.   Shareholders   exempt   from  backup
withholding  include:   corporations;   financial  institutions;   tax  exempt
organizations;  individual  retirement  plans; the U.S., a state, the District
of  Columbia,  a U.S.  possession,  a  foreign  government,  an  international
organization,  or any political subdivision,  agency or instrumentality of any
of the foregoing;  U.S.  registered  commodities or securities  dealers;  real
estate investment trusts;  registered investment companies;  bank common trust
funds;  certain  charitable  trusts;  and  foreign  central  banks  of  issue.
Non-resident  aliens also are generally not subject to backup withholding but,
along  with  certain  foreign  partnerships  and  foreign  corporations,   may
instead be subject to withholding  under section 1441 of the Internal  Revenue
Code.  Shareholders  claiming exemption from backup withholding should call or
write the Fund for further information.
    

                             VALUATION OF SHARES

   
         The net  asset  value  per  share,  the  price  at which  shares  are
continuously  issued and  redeemed,  is computed by dividing  the value of the
Fund's  total  assets,  less its  liabilities,  by the total  number of shares
outstanding.  The Fund's net asset value is determined  every  business day at
the  close  of the New York  Stock  Exchange  (generally,  4:00  p.m.  Eastern
time),  and at such other times as may be appropriate or necessary.  The Funds
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.
         The Fund's assets,  including  commitments to purchase  securities on
a when-issued  basis,  are 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 a Fund may tend to be
higher  than a like  computation  made by a fund  with  identical  investments
utilizing a method of  valuation  based upon market  prices and  estimates  of
market prices for all of its Fund  instruments.  Thus, if the use of amortized
cost by a Fund resulted in a lower  aggregate Fund value on a particular  day,
a prospective  investor in the Fund would be able to obtain a somewhat  higher
yield than would result from  investment  in a fund  utilizing  solely  market
values,  and  existing  investors in the Fund would  receive  less  investment
income. The converse would apply in a period of rising interest rates.
         Rule 2a-7 under the  Investment  Company Act of 1940 permits the Fund
to  value   its   assets  at   amortized   cost  if  the  Fund   maintains   a
dollar-weighted  average  maturity  of 90  days  or less  and  only  purchases
obligations  having  remaining  maturities  of 13  months  or less.  Rule 2a-7
requires,   as  a  condition  of  its  use,  that  the  Fund  invest  only  in
obligations  determined  by the  Trustees to be of high  quality  with minimal
credit  risks and  further  requires  the  Trustees  to  establish  procedures
designed to stabilize,  to the extent  reasonably  possible,  the Fund's price
per share as  computed  for the  purpose  of sales and  redemptions  at $1.00.
Such  procedures  include  review of the  Fund's  investment  holdings  by the
Trustees,  at such  intervals  as they  may  deem  appropriate,  to  determine
whether  the Fund's  net asset  value  calculated  by using  available  market
quotations or  equivalents  deviates from $1.00 per share.  If such  deviation
exceeds 1/2 of 1%, the Trustees  will promptly  consider what action,  if any,
will be  initiated.  In the  event the  Trustees  determine  that a  deviation
exists  which may  result in  material  dilution  or other  unfair  results to
investors or existing  shareholders,  the Trustees  will take such  corrective
action as they regard as necessary  and  appropriate,  including:  the sale of
Fund  instruments  prior to maturity to realize  capital gains or losses or to
shorten  average Fund  maturity;  the  withholding  of dividends or payment of
distributions  from capital or capital  gains;  redemptions of shares in kind;
or the  establishment  of a net asset  value per share  based  upon  available
market quotations.
    

                             CALCULATION OF YIELD

         From  time to  time,  the  Fund  advertises  "yield"  and  "effective
yield."  Both  yield  figures  are based on  historical  earnings  and are not
intended  to indicate  future  performance.  The "yield"  refers to the actual
income  generated by an investment  in the Fund over a particular  base period
of time.  The length and closing  date of the base  periods  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.  A  Fund's  "effective  yield"  for a  seven-day  period  is its
annualized  compounded average yield during the period,  calculated  according
to the following formula:

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

   
         From  time to  time,  the  Fund  may  provide,  for a  given  period,
quotations of dividend yield to  shareholders  or prospective  investors.  For
the seven-day  period ended  September 30, 1997, the yield and effective yield
were 5.59% and 5.75%, respectively.
    

                                 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 Fund holdings or give  examples or  securities  that
may have been considered for inclusion in the Fund, whether held or not.
         The Fund or its affiliates may supply  comparative  performance  data
and rankings from  independent  sources such as Donoghue's  Money Fund Report,
Bank Rate Monitor,  Money,  Forbes,  Lipper  Analytical  Services,  Inc.,  CDA
Investment  Technologies,  Inc.,  Wiesenberger  Investment  Companies Service,
Mutual Fund Values  Morningstar  Ratings,  Mutual Fund  Forecaster,  Barron's,
and The Wall Street  Journal.  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  Fund  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 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,  November 30, 1997).  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 of 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 Acacia  Capital  Corporation,  Calvert  New World
Fund and Calvert  World  Values Fund.  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  Abrams,  Blatz,  Gran,  Hendricks  & Reina,  P.A.  DOB:  10/29/35
Address: 900 Oak Tree Road, South Plainfield, New Jersey 07080.
         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:  2040  Nuuanu
Avenue #1805, Honolulu, Hawaii, 96817.
         *CHARLES  E.  DIEHL,   Trustee.  Mr.  Diehl  is  Vice  President  and
Treasurer Emeritus of the George Washington  University,  and has retired from
University  Support  Services,  Inc.  of  Herndon,  Virginia.  He  is  also  a
Director of Acacia Mutual Life  Insurance  Company.  DOB:  10/13/22.  Address:
1658 Quail Hollow Court, McLean, Virginia 22101.
         DOUGLAS E. FELDMAN,  M.D.,  Trustee.  Dr. Feldman  practices head and
neck reconstructive surgery in the Washington,  D.C.,  metropolitan area. DOB:
05/23/48. Address: 7536 Pepperell Drive, Bethesda, Maryland 20817.
         PETER W. GAVIAN,  CFA,  Trustee.  Mr. Gavian is a principal of Gavian
De Vaux Associates,  an investment  banking firm. He was formerly President of
Corporate Finance of Washington,  Inc. DOB:  12/08/32.  Address:  1953 Gallows
Road, Suite 130, Vienna, 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,  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 Acacia  Capital  Corporation  and Calvert New World Fund.  DOB:  05/15/48.
Address: 7205 Pomander Lane, Chevy Chase, Maryland 20815.
         ARTHUR J. PUGH,  Trustee.  Mr.  Pugh  serves as a Director  of Acacia
Federal Savings Bank. DOB: 09/24/37.  Address:  4823 Prestwick Drive, Fairfax,
Virginia 22030.
         *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
President   and   Director   of   Calvert-Sloan   Advisers,   L.L.C.,   and  a
trustee/director  of each of the investment  companies in the Calvert Group of
Funds. DOB: 08/09/52.
         *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. 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
Acacia  Capital  Corporation  and  Calvert  New World  Fund.  Mr.  Silby is 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.
         M. CHARITO  KRUVANT,  Trustee.  Ms.  Kruvant is President of Creative
Associates  International,  Inc., a firm that  specializes in human  resources
development,  information  management,  public affairs and private  enterprise
development.  DOB: 12/08/45.  Address: 5301 Wisconsin Avenue, N.W. Washington,
D.C. 20015.
         RENO J. MARTINI,  Senior Vice  President.  Mr. Martini is 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: 01/13/50.
         RONALD M.  WOLFSHEIMER,  CPA,  Treasurer.  Mr.  Wolfsheimer is Senior
Vice  President and  Controller 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: 07/24/52.
         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 Vice
President and Secretary of Calvert-Sloan  Advisers,  L.L.C., 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. 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.
     LISA CROSSLEY NEWTON, Esq., Assistant Secretary and Compliance Officer. Ms.
Crossley 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:
12/31/61.
          IVY WAFFORD DUKE, Esq., Assistant Secretary. Ms. Duke is Assistant
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: 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,  Silby and Ms.  Krumsiek are among the
trustees,  Acacia Capital  Corporation,  of which only Messrs.  Blatz,  Diehl,
Pugh and Ms.  Krumsiek  are among the  directors,  Calvert  World Values Fund,
Inc.,  of which only  Messrs.  Guffey,  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. The Board's  Investment Policy Committee is
composed of Messrs. Borts, Diehl, Gavian, Rochat, Silby and Ms. Krumsiek.
         During  fiscal  1997,  trustees of the Fund not  affiliated  with the
Fund's  Advisor were paid $45,115.  Trustees of the Fund not  affiliated  with
the  Advisor  presently  receive  an annual fee of  $20,500  for  service as a
member of the Board of Trustees of the  Calvert  Group of Funds,  and a fee of
$750 to $1,500 for each regular  Board or  Committee  meeting  attended;  such
fees are allocated among the respective Funds on the basis of net assets.
         Trustees  of the Fund not  affiliated  with the  Fund's  Advisor  may
elect to defer  receipt of all or a  percentage  of their fees and invest them
in any fund in the  Calvert  Group  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.
Management  believes this will have a negligible  effect on the Fund's assets,
liabilities,  net  assets,  and net  income per share,  and will  ensure  that
there is no duplication of advisory fees.
    

                          Trustee Compensation Table

Fiscal                  Aggregate           Pension           Total
Year                    Compensation        or                Compensation
1997                    from                Retirement        from
                        Registrant          Benefits          Registrant
                        for Service         Accrued           and Fund
                        as Trustee          as Part of        Complex
                                            Registrant        paid to
                                            Expenses*         Trustee**
Name of Trustee

   
Richard L. Baird, Jr.   $3,181              $0                $34,450
Frank H. Blatz, Jr.     $3,975              $3,975            $46,000
Frederick T. Borts      $3,165              $0                $32,500
Charles E. Diehl        $3,909              $3,909            $44,500
Douglas E. Feldman      $3,560              $0                $32,500
Peter W. Gavian         $3,666              $1,556            $38,500
John G. Guffey, Jr.     $3,818              $0                $61,615
M. Charito Kruvant      $3,421              $0                $36,250
Arthur J. Pugh          $4,150              $216              $48,250
D. Wayne Silby          $3,421              $0                $62,830

*Messrs. Blatz, Diehl, Gavian and Pugh have chosen to defer a portion of
their compensation. As of September 30, 1997, total deferred compensation,
including dividends and capital appreciation, was $542,400.28, $550,026.46,
$132,815.21, and $195,548.47, for each trustee, respectively.
**As of December 31, 1997, 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 subsidiary  of Acacia Mutual
Life Insurance Company of Washington, D.C. ("Acacia Mutual").
         The  Advisory  Contract  between the Fund and the Advisor will remain
in effect until January 1, 1999,  and from year to year  thereafter,  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 Advisory  Contract or interested  persons of such parties,  cast in person
at a meeting called for the purpose of voting on such  approval.  The Advisory
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 Advisory  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,  payable  monthly,  of  0.25% of the  Fund's  average  daily  net
assets.  Prior to November 6, 1996 the  contractual fee was 0.50% of the first
$500 million of the Fund's  average daily net assets,  0.475% of the next $500
million  of such  assets,  0.45%  of the next  $500  million  of such  assets,
0.425% of the next $500 million of such  assets,  and 0.40% of all such assets
over $2 billion.  From July 1, 1996 to November 6, 1996,  a portion of the fee
was waived.
         The  Advisor  provides  the  Fund  with  investment  supervision  and
management,  administrative  services,  office space,  furnishes executive and
other  personnel  to the Fund,  and pays the salaries and fees of all Trustees
who are  affiliated  persons of the  Advisor.  The  Advisor may assume and pay
certain Fund  advertising and  promotional  expenses and reserves the right to
compensate   broker-dealers   in   consideration   of  their   promotional  or
administrative services.
         The  Fund  pays  all  other  expenses   including:   custodial  fees;
shareholder  servicing,  dividend disbursing and transfer agency 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 Fund securities.
         The advisory  fees  accrued for the 1995,  1996 and 1997 fiscal years
were $378,388,  $210,360, and $934,322,  respectively.  During 1995, 1996, and
1997 fiscal years,  the Advisor  voluntarily  waived fees or assumed  expenses
of $71,798,  $198,710,  and $1,107,017,  respectively,  which were not charged
to the Fund.
         Calvert  Administrative  Services Company  ("CASC"),  an affiliate of
the Advisor,  has been retained by the Fund to provide certain  administrative
services  necessary to the conduct of its affairs,  including the  preparation
of regulatory  filings and shareholder  reports,  the daily  determination  of
its net  asset  value  per share and  dividends,  and the  maintenance  of its
portfolio  and  general  accounting  records.  For the 1996  and  1997  fiscal
periods,   CASC  received  $13,365  and  $176,987  in   administrative   fees,
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., and Acacia  Mutual,  has been retained by the Fund to act as shareholder
servicing agent.  Shareholder  servicing  responsibilities  include responding
to  shareholder   inquiries  and   instructions   concerning  their  accounts,
entering  any  telephoned  purchases  or  redemptions  into the  NFDS  system,
maintenance of broker-dealer  data, and preparing and distributing  statements
to shareholders regarding their accounts.  Calvert Shareholder Services,  Inc.
was the sole  transfer  agent  prior to January 1, 1998.  For these  services,
NFDS and  Calvert  Shareholder  Services,  Inc.  receive a total fee of $14.00
per shareholder account and $1.60 per shareholder transaction.
    

                    INDEPENDENT ACCOUNTANTS AND CUSTODIANS

   
         Coopers  &  Lybrand,  L.L.P.  has  been  selected  by  the  Board  of
Trustees to serve as independent  auditors for fiscal year 1998.  State Street
Bank & Trust Company,  N.A., 225 Franklin Street,  Boston, MA 02110, serves as
custodian of the Fund's  investments.  First  National  Bank of  Maryland,  25
South Charles  Street,  Baltimore,  Maryland 21203 also serves as custodian of
certain of the Fund's cash assets.  The  custodian has no part in deciding the
Fund's  investment  policies  or  the  choice  of  securities  that  are to be
purchased or sold for the Fund's Funds.
    

                            METHOD OF DISTRIBUTION

   
         The Fund has entered  into an agreement  with  Calvert  Distributors,
Inc.  ("CDI")  whereby  CDI,  acting as  principal  underwriter  for the Fund,
makes a  continuous  offering  of the Fund's  securities  on a "best  efforts"
basis.  Under  the  terms  of the  agreement,  CDI was  entitled  to  receive,
pursuant to the Fund's  Distribution  Plan,  a  distribution  service fee from
the  Fund  of  0.35%  of  its  average   daily  net  assets.   However,   this
Distribution Plan was terminated, effective June 30, 1996.
         For  the  1995,   1996,   and  1997  fiscal  years,   the  Fund  paid
Distribution Plan expenses of $315,130,  $53,695, and $0, respectively.  Apart
from the  Plan,  the  Advisor  and the  principal  underwriter,  at their  own
expense,  may incur costs and pay expenses  associated  with the  distribution
of shares of the Fund.
    

                            PORTFOLIO TRANSACTIONS

   
         Transactions    are   allocated   to   various    underwriters    and
broker-dealers  by the Fund's Advisor.  Newly issued  securities are purchased
from  underwriters  acting as principals at prices which include  underwriting
fees.  Purchases  of  securities  in the  secondary  market  and all sales are
placed  with  broker-dealers  who  may be  acting  as  agents  or  principals.
Broker-dealers  who  execute  Fund  transactions  on  behalf  of the  Fund are
selected   primarily  on  the  basis  of  their   execution   capability   and
secondarily  on the value and  quality  of their  services.  The  Advisor  may
place  orders  for the  purchase  or sale of Fund  securities  with  qualified
broker-dealers   who  provide  it  with   statistical,   research,   or  other
information and services.  Such  broker-dealers  may receive  compensation for
executing  Fund  transactions  that is in excess of the  compensation  another
broker-dealer  would have  received for  executing  such  transactions  if the
Advisor  determines  in good faith that such  compensation  is  reasonable  in
relation  to  the  value  of  the  information  or  services  that  have  been
provided.  During the fiscal  years  ended  September  30,  1995 and 1996,  no
brokerage  commissions were paid by the Fund to any broker-dealer,  officer or
director  of the  Fund or any of  their  affiliates.  For  fiscal  year  1997,
aggregate brokerage commissions paid to broker-dealers was $0.
         The  Advisor  may also  execute  Fund  transactions  with or  through
broker-dealers  who have sold  shares of the Fund.  However,  such  sales will
not be a qualifying or  disqualifying  factor in a  broker-dealer's  selection
nor will the  selection  of any  broker-dealer  be based on the volume of Fund
shares sold.
    

                             GENERAL INFORMATION

         The  Fund  is the  only  series  of a  Massachusetts  business  trust
organized on March 16,  1982,  under the name  Calvert  Cash  Reserves,  doing
business as Money  Management  Plus.  The Fund is no longer doing  business as
Money  Management  Plus,  effective June 30, 1996.  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.
         The  Fund  will  send  its  shareholders  unaudited  semi-annual  and
audited  annual  reports  that will  include  the Fund's  net asset  value per
share, Fund 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.

                             FINANCIAL STATEMENTS

   
         The audited  financial  statements  included in the Annual  Report to
Shareholders   dated  September  30,  1997,  are  expressly   incorporated  by
reference  and  made a part  of  this  Statement  of  Additional  Information.
Copies of this  Report  may be  obtained  free of charge by writing or calling
the Fund.
    

             CONTROL PERSONS AND PRINCIPAL HOLDERS OF SECURITIES

   
         As of January 2, 1998,  the  following  shareholders  owned of record
5% or more of the Fund:

         Name and Address                   % of Ownership
         Leland Stanford Jr. University     5.54%
         CEFA N
         2770 Sand Hill Road
         Menlo Park, California 94025-7020

         The Stanley Works                  17.85%
         Darice A. McLellan Adm.
         1000 Stanley Drive
         New Britain, Connecticut 06053-1675
    

                                   APPENDIX

Commercial Paper Ratings
         Commercial  paper rated A-1 by Standard & Poor's  Corporation has the
following  characteristics:   liquidity  ratios  are  adequate  to  meet  cash
requirements;  long-term  senior  debt is rated "A" or better;  the issuer has
access to at least two  additional  channels of borrowing;  basic earnings and
cash  flow  have  an   upward   trend   with   allowance   made  for   unusual
circumstances;  typically,  the issuer's  industry is well established and the
issuer has a strong  position  within the industry;  and the  reliability  and
quality of management are  unquestioned.  The relative strength or weakness of
the above factors  determines  whether an issuer's  commercial  paper is rated
Al, A2, or A3.
         The rating Prime-1 is the highest  commercial  paper rating  assigned
by Moody's  Investors  Service,  Inc. Among the factors  considered by Moody's
in assigning  rating are the  following:  evaluation of the  management of the
issuer;  economic  evaluation of the issuer's  industry or  industries  and an
appraisal of  speculative-type  risks which may be inherent in certain  areas;
evaluation of the issuer's  products in relation to  competition  and customer
acceptance;  liquidity;  amount  and  quality  of  long-term  debt;  trend  of
earnings over a period of ten years;  financial  strength of a parent  company
and the  relationships  which exist with the issuer;  and  recognition  by the
management  of  obligations  which may be  present or may arise as a result of
public interest question and preparations to meet such obligations.

<PAGE>

PART C. OTHER INFORMATION


Item 24. Financial Statements and Exhibits

         (a) Financial statements

         Financial statements incorporated by reference to:

   
         All financial statements for Calvert Cash Reserves
         are incorporated by reference to Registrant's
         Annual Report to Shareholders dated September 30, 1997,
         and filed December 10, 1997.
    

         Schedules II-VII, inclusive, for which provision is made
         in the applicable accounting regulation of the
         Securities and Exchange Commission, are omitted because
         they are not required under the related instructions,
         or they are inapplicable, or the required information
         is presented in the financial statements or notes
         thereto.


         (b)      Exhibits:

         1. Declaration of Trust (incorporated by
         reference to Registrant's Initial Registration
         Statement, March 16, 1982).

         2. By-Laws (incorporated by reference to
         Registrant's Pre-Effective Amendment No. 2,
         August 31, 1982).

         4. Specimen Stock Certificate (incorporated by
         reference to Registrant's Pre-Effective
         Amendment No. 2, August 31, 1982).

         5. Advisory Contract (incorporated by reference
         to Registrant's Post-Effective Amendment No.
         4, December 31, 1984).

         6. Underwriting and Dealer Agreements
         (incorporated by reference to Registrant's
         Post-Effective Amendment No. 17, January 31,
         1995).

         7. Trustees' Deferred Compensation Agreement
         (incorporated by reference to Registrant's
         Post-Effective Amendment No. 12, January 31,
         1992).

         8. Custodial Contract (incorporated by reference
         to Registrant's Post-Effective Amendment No.
         13, September 30, 1992).

         9. Transfer Agency Contract (incorporated by
         reference to Registrant's Post-Effective
         Amendment No. 4, December 31, 1984).

         10. Opinion and Consent of Counsel as to Legality
         of Shares Being Registered.

         11. Consent of Independent Accountants to
         Use of Report.

         14. Retirement Plans,(incorporated by reference to
         Registrant's Post-Effective Amendment No. 12,
         January 31, 1992).

         15. Rule 12b-1 Distribution Plan (incorporated by
         reference to Registrant's Pre-Effective
         Amendment No. 2, August 31, 1982).

         16. Schedule for Calculation of Performance
         Quotation (incorporated by reference to
         Registrant's Post-Effective Amendment No. 9,
         January 30, 1989).

         Exhibits 3, 12 and 13 are omitted because they are inapplicable.


Item 25. Persons Controlled By or Under Common Control With Registrant

         Registrant is controlled by its Board of Trustees, which is a
common Board with five registered investment companies, Calvert Tax-Free
Reserves, First Variable Rate Fund for Government Income, Calvert Cash
Reserves, The Calvert Fund, and Calvert Municipal Fund, Inc. In addition,
certain members of Registrant's Board of Trustees also serve on the Boards of
Calvert Social Investment Fund, Acacia Capital Corporation, Calvert World
Values Fund, Inc., and Calvert New World Fund, Inc.


Item 26. Number of Holders of Securities

   
         As of December 31, 1997, there were 60 holders of record of
Registrant's shares of beneficial interest for Institutional Prime Fund.
    


Item 27. Indemnification

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

         Registrant's Declaration of Trust also provides that Registrant
may purchase and maintain liability insurance on behalf of any officer,
trustee, employee or agent against any liabilities arising from such
status. In this regard, Registrant maintains a Directors & Officers
(Partners) Liability Insurance Policy with Chubb Group of Insurance
Companies, 15 Mountain View Road, Warren, New Jersey 07061, providing
Registrant with $5 million in directors and officers liability coverage,
plus $3 million in excess directors and officers liability coverage for
the independent trustees/directors only. Registrant also maintains an
$8 million Investment Company Blanket Bond issued by ICI Mutual
Insurance Company, P.O. Box 730, Burlington, Vermont, 05402.


Item 28. Business and Other Connections of Investment Adviser

                           Name of Company, Principal
Name                       Business and Address                   Capacity


   
Barbara J. Krumsiek        Acacia Capital Corporation             Officer
                           Calvert Municipal Fund, Inc.            and
                           Calvert World Values Fund, Inc.        Director

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

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


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

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


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

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


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

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


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

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


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


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

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


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

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


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

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


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

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


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

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


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

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


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


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


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


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


Item 29. Principal Underwriters

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

         (b)      Positions of Underwriter's Officers and Directors

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

   
Barbara J. Krumsiek        Director and President         President and Trustee
    

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

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

Karen Becker               Vice President, Operations     None

Steve Cohen                Vice President                 None

Geoffrey Ashton            Regional Vice President        None

   
Martin Brown               Regional Vice President        None

Janet Haley                Regional Vice President        None

Ben Ogbogu                 Regional Vice President        None
    

Susan Walker Bender        Assistant Secretary            Assistant Secretary

Katherine Stoner           Assistant Secretary            Assistant Secretary

   
Lisa Crossley Newton       Assistant Secretary            Assistant Secretary
                           and Compliance Officer
    

Ivy Wafford Duke           Assistant Secretary            Assistant Secretary

         (c)      Inapplicable.


Item 30. Location of Accounts and Records

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


Item 31. Management Services

         Not Applicable


Item 32. Undertakings

         a)       Not Applicable

         b)       Not Applicable

         (c)      The Registrant undertakes to furnish to each person to
                  whom a Prospectus is delivered, a copy of the
                  Registrant's latest Annual Report to Shareholders, upon
                  request and without charge.


         SIGNATURES


Pursuant to the requirements of the Securities Act of 1933 and
the Investment Company Act of 1940, the Registrant certifies that it
meets all of the requirements for effectiveness of this registration
statement pursuant to Rule 485(b) under the Securities Act of 1933 and
has duly caused this registration statement to be signed on its behalf
by the undersigned, thereto duly authorized in the City of Bethesda, and
State of Maryland, on the 21st day of January, 1998.


CALVERT CASH RESERVES

         By:
         _________________________________
         Barbara J. Krumsiek
         President and Trustee


         SIGNATURES


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


Signature                           Title                     Date


__________**____________            President and             1/21/98
Barbara J. Krumsiek                 Trustee (Principal Executive Officer)


__________**____________            Principal Accounting      1/21/98
Ronald M. Wolfsheimer               Officer


__________**____________            Trustee                   1/21/98
Richard L. Baird, Jr.


__________**____________            Trustee                   1/21/98
Frank H. Blatz, Jr., Esq.


__________**____________            Trustee                   1/21/98
Frederick T. Borts, M.D.


__________**____________            Trustee                   1/21/98
Charles E. Diehl


__________**____________            Trustee                   1/21/98
Douglas E. Feldman


__________**____________            Trustee                   1/21/98
Peter W. Gavian


__________**____________            Trustee                   1/21/98
John G. Guffey, Jr.


__________**____________            Trustee                   1/21/98
M. Charito Kruvant


__________**____________            Trustee                   1/21/98
Arthur J. Pugh


__________**____________            Trustee                   1/21/98
David R. Rochat


__________**____________            Trustee                   1/21/98
D. Wayne Silby


** Signed by Susan Walker Bender pursuant to power of attorney,
attached hereto.

<PAGE>

Exhibit Index



Form N-1A
Item No.

Exhibit-23
24(b)(10)           Form of Opinion and Consent of Counsel

Exhibit-23A
24(b)(11)           Independent Auditors' Consent

Exhibit-24          Power of Attorney











Exhibit 10



January 21, 1998


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

         Re:      Exhibit 10, Form N-1A
                  Calvert Cash Reserves
                  File numbers 2-76527 and 811-3418

Ladies and Gentlemen:

         As counsel to Calvert Cash Reserves (the "Trust"), it is my opinion,
based upon an examination of the Trust's Declaration of Trust and By-Laws and
such other original or photostatic copies of Trust records, certificates of
public officials, documents, papers, statutes, and authorities as I deemed
necessary to form the basis of this opinion, that the securities being
registered by this Post-Effective Amendment No. 22 of the Trust will, when
sold, be legally issued, fully paid and non-assessable.

         Consent is hereby given to file this opinion of counsel with the
Securities and Exchange Commission as an Exhibit to the Trust's Post-Effective
Amendment No. 22 to its Registration Statement.

Sincerely,



Susan Walker Bender
Associate General Counsel







CONSENT OF INDEPENDENT ACCOUNTANTS

To the Board of Directors of Calvert Cash Reserves

     We consent to the  incorporation by reference in  Post-Effective  Amendment
No. 22 to the Registration Statement of Calvert Cash Reserves on Form N-1A (File
Numbers  2-76527 and 811-3418) of our report dated November 7, 1997 on our audit
of the financial  statements  and financial  highlights of  Institutional  Prime
Fund, which report is included in the Annual Report to Shareholders for the year
ended September 30, 1997 which is incorporated by reference in the  Registration
Statement.  We also  consent  to the  reference  to our firm  under the  caption
"Independent   Accountants  and  Custodians"  in  the  Statement  of  Additional
Information.

COOPERS & LYBRAND L.L.P.
Baltimore, Maryland
January 21, 1998





                               POWER OF ATTORNEY


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

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

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

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

         WITNESS my hand on the date set forth below.


May 7, 1997
Date                                        /Signature/

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


<PAGE>

                               POWER OF ATTORNEY


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

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

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

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

         WITNESS my hand on the date set forth below.

May 7, 1997
Date                                        /Signature/

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


<PAGE>



                               POWER OF ATTORNEY


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

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

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

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

         WITNESS my hand on the date set forth below.

May 7, 1997
Date                                        /Signature/

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


<PAGE>


                               POWER OF ATTORNEY


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

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

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

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

         WITNESS my hand on the date set forth below.

May 7, 1997
Date                                        /Signature/

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

<PAGE>


                               POWER OF ATTORNEY


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

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

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

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

         WITNESS my hand on the date set forth below.

May 7, 1997
Date                                        /Signature/

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



<PAGE>



                               POWER OF ATTORNEY


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

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

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

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

         WITNESS my hand on the date set forth below.

May 7, 1997
Date                                        /Signature/

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



<PAGE>


                               POWER OF ATTORNEY


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

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

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

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

         WITNESS my hand on the date set forth below.

May 7, 1997
Date                                        /Signature/

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



<PAGE>

                               POWER OF ATTORNEY


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

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

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

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

         WITNESS my hand on the date set forth below.

May 7, 1997
Date                                        /Signature/

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



<PAGE>

                               POWER OF ATTORNEY


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

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

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

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

         WITNESS my hand on the date set forth below.

May 7, 1997
Date                                        /Signature/

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



<PAGE>

                               POWER OF ATTORNEY


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

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

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

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

         WITNESS my hand on the date set forth below.


May 7, 1997
Date                                        /Signature/

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



<PAGE>

                               POWER OF ATTORNEY


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

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

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

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

         WITNESS my hand on the date set forth below.

May 7, 1997
Date                                        /Signature/

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



<PAGE>


                               POWER OF ATTORNEY


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

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

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

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

         WITNESS my hand on the date set forth below.

January 16, 1998
Date                                        /Signature/

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



<PAGE>

                               POWER OF ATTORNEY


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

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

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

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

         WITNESS my hand on the date set forth below.

December 16, 1997
Date                                        /Signature/

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




<TABLE> <S> <C>

<ARTICLE> 6
<CIK> 0000701219
<NAME> CALVERT CASH RESERVES
<SERIES>
   <NUMBER> 164
   <NAME> INSTITUTIONAL PRIME FUND
<MULTIPLIER> 1000
       
<S>                             <C>
<PERIOD-TYPE>                   YEAR
<FISCAL-YEAR-END>                          SEP-30-1997
<PERIOD-START>                             APR-01-1997
<PERIOD-END>                               SEP-30-1997
<INVESTMENTS-AT-COST>                           373787
<INVESTMENTS-AT-VALUE>                          373787
<RECEIVABLES>                                     1519
<ASSETS-OTHER>                                     264
<OTHER-ITEMS-ASSETS>                                 0
<TOTAL-ASSETS>                                  375570
<PAYABLE-FOR-SECURITIES>                             0
<SENIOR-LONG-TERM-DEBT>                              0
<OTHER-ITEMS-LIABILITIES>                          219
<TOTAL-LIABILITIES>                                219
<SENIOR-EQUITY>                                      0
<PAID-IN-CAPITAL-COMMON>                        375355
<SHARES-COMMON-STOCK>                           375353
<SHARES-COMMON-PRIOR>                           131217
<ACCUMULATED-NII-CURRENT>                            0
<OVERDISTRIBUTION-NII>                               0
<ACCUMULATED-NET-GAINS>                            (4)
<OVERDISTRIBUTION-GAINS>                             0
<ACCUM-APPREC-OR-DEPREC>                             0
<NET-ASSETS>                                    375351
<DIVIDEND-INCOME>                                    0
<INTEREST-INCOME>                                19861
<OTHER-INCOME>                                       0
<EXPENSES-NET>                                     201
<NET-INVESTMENT-INCOME>                          19660
<REALIZED-GAINS-CURRENT>                           (4)
<APPREC-INCREASE-CURRENT>                            0
<NET-CHANGE-FROM-OPS>                            19656
<EQUALIZATION>                                       0
<DISTRIBUTIONS-OF-INCOME>                        19660
<DISTRIBUTIONS-OF-GAINS>                             0
<DISTRIBUTIONS-OTHER>                                0
<NUMBER-OF-SHARES-SOLD>                        4326893
<NUMBER-OF-SHARES-REDEEMED>                    4096022
<SHARES-REINVESTED>                              13265
<NET-CHANGE-IN-ASSETS>                          244136
<ACCUMULATED-NII-PRIOR>                              0
<ACCUMULATED-GAINS-PRIOR>                            0
<OVERDISTRIB-NII-PRIOR>                              0
<OVERDIST-NET-GAINS-PRIOR>                           0
<GROSS-ADVISORY-FEES>                              934
<INTEREST-EXPENSE>                                   0
<GROSS-EXPENSE>                                   1349
<AVERAGE-NET-ASSETS>                            488718
<PER-SHARE-NAV-BEGIN>                             1.00
<PER-SHARE-NII>                                   .055
<PER-SHARE-GAIN-APPREC>                              0
<PER-SHARE-DIVIDEND>                            (.055)
<PER-SHARE-DISTRIBUTIONS>                            0
<RETURNS-OF-CAPITAL>                                 0
<PER-SHARE-NAV-END>                               1.00
<EXPENSE-RATIO>                                   0.06
<AVG-DEBT-OUTSTANDING>                               0
<AVG-DEBT-PER-SHARE>                                 0
        

</TABLE>


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