CALVERT CASH RESERVES
497, 1997-02-04
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PROSPECTUS --
January 31, 1997
                             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 U.S. 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 A-2/P-2 commercial paper. An
investment in the Fund is neither insured nor guaranteed by the U.S.
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 (dated January 31, 1997) 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.
    

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
                                             FundPrime Portfolio
    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 (as a
    percentage of average net assets)
    Management Fees                          0.30%
    Rule 12b-1 Fees                          None
    Other Expenses                           0.06%
    Total Fund Operating Expenses            0.36%


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
                  $415              $12            $20                $46

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).

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

   
     B. 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. ("Advisor") for managing its investments
and business  affairs.  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.
    



      
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 respective 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 Statement of Additional Information.

   
<TABLE>
<CAPTION>

Year Ended September 30,                         1996                1995
<S>                                              <C>                 <C>  
Net asset value, beginning of year               $1.00               $1.00
    

Income from investment operations
     Net investment income                        .040                .045

Distributions from
     Net investment income                       (.040)              (.045)

Net asset value, end of year                     $1.00               $1.00

Total return<F1>                                  3.99%               4.55%

   
Ratio to average net assets
     Net investment income                       4.80%               4.53%
     Total expenses<F2>                          0.73%               1.41%
     Net expenses                                0.69%               1.39%
     Expenses reimbursed and/or waived           0.47%               --
<FN>
<F1>Total return prior to 1989 is not audited.
<F2> 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.

</FN>
</TABLE>
    

   
Net assets, end of year (in thousands)           $131,218            $26,775

Number of shares outstanding at
end of year (in thousands)                       131,217             26,821
    

<PAGE>

<TABLE>

<CAPTION>
   
Year Ended September 30,                         1994                1993
Net asset value, beginning of year               $1.00               $1.00
<S>                                               <C>                 <C>

Income from investment operations
     Net investment income                       .028                .025

Distributions from
     Net investment income                       (.028)              (.025)
    

Net asset value, end of year                     $1.00               $1.00

Total retur<F3>                                   2.78%               2.59%

   
Ratio to average net assets
     Net investment income                       2.75%               2.48%
     Total expenses<F4>                             --                  --
     Net expenses                                1.23%                .92%
     Expenses reimbursed and/or waived           --                   --

Net assets, end of year (in thousands)           $99,973             $102,325

Number of shares outstanding at
end of year (in thousands)                       100,024             102,370
    

<FN>
<F3>Total return prior to 1989 is not audited.
<F4> 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.
</FN>
</TABLE>



<PAGE>

<TABLE>

<CAPTION>
Year Ended September 30,                         1992                1991
<S>                                              <C>                 <C>  
   
Net asset value, beginning of year               $1.00               $1.00

Income from investment operations
     Net investment income                       .037                .061
    

Distributions from
     Net investment income                       (.037)              (.061)

   
Net asset value, end of year                     $1.00               $1.00
    

Total return<F1>                                  3.72%               6.27%

   
Ratio to average net assets
     Net investment income                       3.69%               6.09%
     Total expenses<F2>                          ----                ----
     Net expenses                                .87%                .93%
     Expenses reimbursed and/or waived           --                  --
    

Net assets, end of year (in thousands)           $106,851            $119,316

   
Number of shares outstanding at
end of year (in thousands)                       106,897             119,362
    

<FN>
<F1>Total return prior to 1989 is not audited.
<F2> 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
</FN>
</TABLE>

<PAGE>


Year Ended September 30,                         1990                1989
                                                             
Net asset value, beginning of year               $1.00               $1.00

   
Income from investment operations
     Net investment income                       .074                .083

Distributions from
     Net investment income                       (.074)              (.083)

Net asset value, end of year                     $1.00               $1.00
    

Total return<F5>                                  7.71%               8.69%

Ratio to average net assets
     Net investment income                       7.45%               8.27%
     Total expenses<F6>                           --                  ----
     Net expenses                                .96%                .91%
     Expenses reimbursed and/or waived           .13%                .12%

   
Net assets, end of year (in thousands)           $117,684            $156,777

Number of shares outstanding at
end of year (in thousands)                       117,699             156,797
    

<F5>Total return prior to 1989 is not audited.
<F6> 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.



<PAGE>



   
Year Ended September 30,                         1988                1987

Net asset value, beginning of year               $1.00               $1.00

Income from investment operations
     Net investment income                       .067                .057

Distributions from
     Net investment income                       (.067)              (.057)

Net asset value, end of year                     $1.00               $1.00
    

Total return<F1>                                  6.99%               6.07%

   
Ratio to average net assets
     Net investment income                       6.44%               5.56%
     Total expenses<F2>                            --                  --
     Net expenses                                .86%                .85%
     Expenses reimbursed and/or waived           .25%                .26%
    

Net assets, end of year (in thousands)           $91,640             $63,134

   
Number of shares outstanding at
end of year (in thousands)                       91,660              63,138

    

<F1>Total return prior to 1989 is not audited.
<F2> 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 ReservesInstitutional 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 U.S. 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, U.S. dollar
denominated international money market investments and may invest up to 5% of
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 Statement of Additional Information, "Appendix, Commercial
Paper and Bond Ratings."
    

Other Policies

The Fund has adopted certain fundamental investment restrictions which are
discussed in detail in the Statement of Additional Information. 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 the only series of Calvert Cash Reserves, a Massachusetts business
trust organized on March 16, 1982. Prior to June 30, 1996, Calvert Cash
Reserves was doing business as Money Management Plus, and the Institutional
Prime Fund was known as the Prime Portfolio. In October 1992, a second class
of shares was offered by the Prime Portfolio, 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, transfer 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, 1996, Calvert Group managed and administered assets in
excess of $5.2 billion and more than 220,000 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.

   
Pursuant to the Investment Advisory Agreement, the Advisor is entitled to, and
did receive from October 1, 1995 to June 30, 1996, an annual advisory fee of
0.50% of the Fund's average daily net assets. However, beginning July 1, 1996,
the Advisor began to voluntarily waive a portion of its advisory fee. On
November 6, 1996, the Fund's Board of Trustees voted to lower the advisory fee
to 0.25% of Institutional Prime's average daily net assets.

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. For fiscal 1996, 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's
Class A Shares.
    

The transfer agent keeps your account records.

Calvert Shareholder Services, Inc. is the Fund's transfer, dividend
disbursing and 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                              New Accounts                      Additional
Investments

By Wire                             $1,000,000 minimum                No minimum

   
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 with
the same name(s), address and taxpayer identification number as your existing
Calvert account.

Wire Investment to:

State Street Bank and Trust Company
Boston, MA.
ABA# 011000028
FBO Calvert Cash Reserves Fund 707
Wire Account #9903-765-7
Client's name and account number

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 net asset value  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, a wire must be received by 12:30 p.m. Eastern time to earn that
business day's dividend. 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 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 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 net asset value 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 net asset value 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. Calvert encourages you
to notify the Institutional Marketing Group 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.
    

HOW TO SELL YOUR SHARES BY . . .

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.
Additional requirements, below, may apply to your account. 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 U.S. 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.

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 U.S.
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.



To Open an Account:                                       Prospectus
     800-317-2274                                         January 31, 1997
 

Performance and Prices:                                   Calvert Cash Reserves
Calvert Information Network                               Institutional Prime
Fund
24 hours, 7 days a week
     800-317-2274

Service for Existing Account:
     Shareholders              800-317-2274
     Brokers                   800-368-2746

TDD for Hearing Impaired:
     800-541-1524

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

PRINCIPAL UNDERWRITER
Calvert Distributors, Inc.
4550 Montgomery Avenue
Suite 1000N
Bethesda, Maryland 2081

<PAGE>


Calvert Cash Reserves
Institutional Prime Fund

Statement of Additional Information
January 31, 1997


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


INDEPENDENT ACCOUNTANTS



TRANSFER AGENT
Calvert Shareholder Services, Inc.
4550 Montgomery Avenue
Suite 1000N
Bethesda, Maryland 20814

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



TABLE OF CONTENTS

Investment Objective and Policies               1
Investment Restrictions                         3
Purchase and Redemption of Shares               4
Dividends and Taxes                             4
Valuation of Shares                             5
Calculation of Yield                            6
Advertising                                     6
Trustees and Officers                           6
Investment Advisor                              8
Transfer and Shareholder Servicing Agent        9
Independent Accountants and Custodians          9
Method of Distribution                          9
Portfolio Transactions                          9
General Information                            10
Financial Statements                           10
Appendix                                       10



  
                                  

STATEMENT OF ADDITIONAL INFORMATION-January 31, 1997

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

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

Shareholder
Services:         (800) 368-2745

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

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

This  Statement of Additional  Information  is not a prospectus.  Investors
should read the  Statement of Additional  Information  in  conjunction  with the
Fund's Prospectus dated January 31, 1997 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  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."
     A  Fund  may  not  acquire  obligations  subject  to  puts  if  immediately
thereafter, with respect to 75% of the total amortized cost value of its assets,
that Fund would have more than 5% of its total  assets  invested  in  securities
underlying from the same institution.  A Fund may, however,  invest up to 10% of
its total assets in securities underlying unconditional  puts from  the  same
institution.  Unconditional  puts  are  readily  exercisable  in the  event of a
default in payment of principal or interest on the  underlying  securities.  The
Fund must limit its Fund  investments,  including  puts, to  instruments of high
quality  as   determined   by  a  nationally   recognized   statistical   rating
organization.

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  policies  and  the  following
investment  restrictions and fundamental policies 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,
except that only shares of a Fund are entitled to vote on matters affecting only
that Fund (such as changes in investment objective, policies or restrictions). 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. No Fund of the Fund may:
     (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, for The Fund only, 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  more than 25% of its  assets  in any  particular  industry  or
industries,  except  that the Fund may  invest  more  than 25% of its  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 199_ the Fund did qualify  and in 1997 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 do not qualify for the  dividends  received  deduction  for
corporations.  Net long-term capital gain distributions,  if any, will generally
be includable as long-term  capital gain in the gross income of shareholders who
are citizens or residents of the United States. Whether such realized securities
gains and losses are long- or  short-term  depends on the period the  securities
are held by the Fund, not the period for which the  shareholder  holds shares of
the Fund.
     A shareholder may also be subject to state and local taxes on dividends and
distributions  from the Fund. The Fund will notify  shareholders  annually about
the 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 Internal  Revenue Code provides that interest on indebtedness  incurred
or  continued  in order to  purchase or carry  shares of a regulated  investment
company  which  distributes  exempt-interest  dividends  during  the year is not
deductible.
     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,  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, 1996,  the yield and effective  yield were 5.52% and
5.67%, 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,  December 31, 1994). 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 Director of Finance for the
Family  Health  Council,   Inc.  in  Pittsburgh,   Pennsylvania,   a  non-profit
corporation which provides family planning services,  nutrition,  maternal/child
health  care,  and  various   health   screening   services.   Mr.  Baird  is  a
trustee/director  of each of the  investment  companies in the Calvert  Group of
Funds, except for Acacia Capital Corporation, Calvert New World Fund and Calvert
World Values Fund.  DOB:  5/09/46.  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:  7/23/49.  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: 5/23/48.
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: 09/24/47.  Address: 4823 Prestwick Drive,  Fairfax,  Virginia
22030.
     *DAVID  R.  ROCHAT,  Senior  Vice  President  and  Trustee.  Mr.  Rochat is
Executive Vice President of Calvert Asset Management Company, Inc., Director and
Secretary of Grady, Berwald and Co., Inc., and Director and President of Chelsea
Securities, Inc. 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: 7/20/48.  Address:  1715
18th Street, N.W., Washington, D.C. 20009.
     *CLIFTON S. SORRELL,  JR.,  President and Trustee.  Mr.  Sorrell  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. He is a director
of  Calvert-Sloan  Advisers,  L.L.C.,  and a  trustee/director  of  each  of the
investment companies in the Calvert Group of Funds.DOB: 06/26/41.
     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: 1/13/50.
     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: 7/24/52.
     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.
     EVELYNE S. STEWARD, Vice President. Ms. Steward is Senior Vice President of
Calvert  Group,  Ltd., and a director of  Calvert-Sloan  Advisers,  L.L.C.  DOB:
11/14/52.
     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 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: 10/21/56.
         LISA CROSSLEY,  Esq.,  Assistant Secretary and Compliance Officer.  Ms.
Crossley  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: 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.

    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 Sorrell are among the trustees, Acacia Capital Corporation, of
which only  Messrs.  Blatz,  Diehl,  Pugh and Sorrell  are among the  directors,
Calvert World Values Fund, Inc., of which only Messrs. Guffey, Silby and Sorrell
are among the directors, and Calvert New World Fund, Inc., of which only Messrs.
Sorrell and Martini are among the directors.  Trustees  marked with an *, above,
are deemed to be "interested  persons" of the Fund under the Investment  Company
Act of 1940, by virtue of their affiliation with the Fund's Advisor. The address
of trustees 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.
     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 Sorrell.
     During  fiscal 1996,  trustees of the Fund not  affiliated  with the Fund's
Advisor were paid $_____.  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 $1500 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 Year 1996        Aggregate       Pension or      Total
(unaudited numbers)     Compensation    Retirement      Compensation
Name of Trustee         from            Benefits        from
                        Registrant      Accrued as      Registrant and
                        for service     part of         Fund
                        as Trustee      Registrant      Complex paid
                                        Expenses<F1>     to Trustees<F2>

Richard L. Baird, Jr.   $858            $0              $34,925
Frank H. Blatz, Jr.     $0              $940            $37,875
Frederick T. Borts      $826            $0              $32,675
Charles E. Diehl        $0              $869            $35,475
Douglas E. Feldman      $895            $0              $34,175
Peter W. Gavian         $627            $265            $34,175
John G. Guffey, Jr.     $821            $0              $49,433
Arthur J. Pugh          $1006           $0              $36,736
D. Wayne Silby          $757            $0              $56,398

<F1> Messrs.  Blatz, Diehl, Gavian, and Pugh have chosen to defer a portion of
their  compensation.  As of September  30, 1996,  total  deferred  compensation,
including dividends and capital appreciation,  was $______,  $_______,  $______,
and $______, for each trustee, respectively.
    
<F2> As of  December  31,  1996,  the  Fund  Complex  consists  of  eight  (8)
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  3,  1997,  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 Contract or
interested  persons of such parties,  cast in person at a meeting called for the
purpose of voting on such  approval.  The  Contract  may be  terminated  without
penalty by either  party on 60 days'  prior  written  notice;  it  automatically
terminates in the event of its assignment.
     Under the Contract,  the Advisor manages the investment and reinvestment of
the Fund's  assets,  subject to the direction and control of the Fund's Board of
Trustees. For its services, the Advisor receives an annual fee, payable monthly,
of 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.  Until September 30, 1993, the Advisor  voluntarily
waived half of its  advisory  fee for the Fund,  and  charged  only 0.25% of the
Fund's average daily net assets.
     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;  Distribution Plan expenses;  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  Advisor  has agreed to  reimburse  the Fund for the  Fund's  operating
expenses (excluding brokerage,  taxes, interest,  Distribution Plan expenses and
extraordinary items) exceeding,  on a pro rata basis, the most restrictive state
expense limitation in those states where the Funds' shares are registered.
     The  advisory  fees  paid for the 1994,  1995 and 1996  fiscal  years  were
$516,334,  $378,388, and $210,360,  respectively.  The advisor did not reimburse
the Fund  during  the 1994  fiscal  year.  During  1995 and  1996,  the  Advisor
voluntarily   waived  fees  or  assumed   expenses  of  $71,798  and   $198,710,
respectively, which were not charged to the Fund.

                                     TRANSFER AND SHAREHOLDER SERVICING AGENT

     Calvert  Shareholder  Services,  Inc., a wholly owned subsidiary of Calvert
Group, Ltd., and Acacia Mutual Life Insurance Company,  has been retained by the
Fund  to act as  transfer  agent,  dividend  disbursing  agent  and  shareholder
servicing  agent.  These  responsibilities  include:  responding to  shareholder
inquiries and  instructions  concerning  their accounts;  crediting and debiting
shareholder accounts for purchases and redemptions of Fund shares and confirming
such transactions; daily updating of shareholder accounts to reflect declaration
and payment of dividends; and preparing and distributing quarterly statements to
shareholders  regarding their accounts.  For such services,  Calvert Shareholder
Services, Inc. receives compensation based on the number of shareholder accounts
and the number of  transactions.  The service  fees paid to Calvert  Shareholder
Services,  Inc.,  for the 1994,  1995,  and 1996  fiscal  years  were  $140,423,
$144,412, and $92,834, respectively.
                                     
                                    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 1997.  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 had entered into an  agreement  with  Calvert  Distributors,  Inc.
("CDI")  whereby  CDI,  acting as  principal  underwriter  for the Fund,  made a
continuous  offering of the Fund's  securities on a "best efforts" basis.  Under
the terms of the agreements, 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. This Distribution Plan was terminated,  effective June
30, 1996.
     Through June 30, 1996,  pursuant to Rule 12b-1 under the Investment Company
Act of 1940,  the Fund had  adopted  a  Distribution  Plan  (the  "Plan")  which
permitted it to pay certain expenses associated with the distribution of shares.
Such expenses could not exceed, on an annual basis,  0.35% of the Fund's average
daily net assets. The Distribution Plan was approved by shareholders of the Fund
and by the Board of Trustees,  including  the  trustees who are not  "interested
persons" of the Fund (as that term is defined in the  Investment  Company Act of
1940) and who have no direct or indirect  financial interest in the operation of
the Plan or in any agreements  related to the Plan. The selection and nomination
of the trustees who are not  interested  persons of the Fund is committed to the
discretion  of such  disinterested  trustees.  In  establishing  the  Plan,  the
trustees considered various factors including the amount of the distribution fee
(a maximum of 0.35%  annually of the Fund's  average net  assets).  The trustees
determined that there is a reasonable  likelihood that the Plan will benefit the
Fund and its shareholders.
     For the 1994, 1995, and 1996 fiscal years, the Fund paid  Distribution Plan
expenses of  $351,119,  $315,130  and  $53,695, respectively.  Fiscal year 1996
Distribution Plan expenses were used entirely to compensate dealers distributing
shares. 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.  No  brokerage
commissions were paid by the Fund in the past three fiscal years.
     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.  Prior to July 1,  1996,  the Fund was known as Money
Management Plus Prime Portfolio, and was not an institutional money market fund.
The Fund was renamed and converted to Calvert Cash Reserves  Institutional Prime
Fund,  effective  July 1, 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, 1996, 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.
                                                     
                                                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.



   






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