CALVERT SOCIAL INVESTMENT FUND
485BPOS, 1998-03-03
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SEC Registration Nos.
2-75106 and 811-3334

SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

FORM N-1A

REGISTRATION STATEMENT UNDER THE
SECURITIES ACT OF 1933

Post-Effective Amendment No. 26            XX

and/or

REGISTRATION STATEMENT UNDER THE
INVESTMENT COMPANY ACT OF 1940

Amendment No. 26                                    XX

Calvert Social Investment Fund
(Exact Name of Registrant as Specified in Charter)

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

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

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

It is proposed that this filing will become effective


___ Immediately upon filing                      XX on March 3, 1998
pursuant to paragraph (b)                             pursuant to paragraph (b)

___ 60 days after filing                        on date 
pursuant to paragraph (a)                       pursuant to paragraph (a)
of Rule 485.


<PAGE>

Calvert Social Investment Fund
Form N-1A Cross Reference Sheet

Item number                         Prospectus Caption

         1.                         Cover Page
         2.                         Portfolio Expenses
         3.                         Total Return
         4.                         Investment Objectives and Policies
                                    Investment Strategy & Related Risks
                                    Management of the Portfolio
         5.                         Management of the Portfolio
         6.                         Alternative Sales Options
                                    Management of the Portfolio
                                    Dividends and Taxes
         7.                         How to Buy Shares Alternative Sales Options
                                    Management of the Portfolio
                                    Net Asset Value
                                    Exhibit A - Reduced Sales Charges
         8.                         How to Sell Your Shares
         9.                         *

                                    Statement of Additional Information Caption

         10.                        Cover Page
         11.                        Table of Contents
         12.                        General Information
         13                         Investment Objectives and Policies
                                    Investment Restrictions
                                    Investment Selection Screening Process
         14.                        Trustees, Officers and Advisory Council
         15.                        Trustees, Officers and Advisory Council
         16.                        Investment Advisor
                                    Transfer and Shareholder Servicing Agent
                                    Independent Auditors and Custodians
         17.                        Portfolio Transactions
         18.                        General Information
         19.                        Purchase and Redemption of Shares
                                    Net Asset Value
         20.                        Dividends and Taxes
         21.                        Method of Distribution
         22.                        Calculation of Total Return
         23.                         *

*  Inapplicable or negative answer


<PAGE>


                                                                               


 


PROSPECTUS
March 3, 1998

CALVERT SOCIAL INVESTMENT FUND

MANAGED INDEX PORTFOLIO
4550 Montgomery Avenue, Bethesda, Maryland 20814

INVESTMENT OBJECTIVE

The Managed Index Portfolio (the "Portfolio") seeks to provide a total return
after expenses which exceeds over time the total return of the Russell 1000
Index. The Portfolio seeks to obtain this objective while maintaining risk
characteristics similar to those of the Russell 1000 Index and through
investment in equity securities that satisfy the Portfolio's investment and
social criteria.

WHETHER THE PORTFOLIO IS FOR YOU

The Portfolio is designed for investors who are seeking returns which exceed
the Russell 1000 Index with similar risk characteristics and who want to
invest in socially responsible companies.

PURCHASE INFORMATION

The Portfolio offers four classes of shares, each with different expense
levels and sales charges.  You may choose to purchase (i) Class A shares, with
a sales charge imposed at the time you purchase the shares ("front-end sales
charge"), (ii) Class B shares, which impose no front-end sales charge, but may
impose a deferred sales charge at the time of redemption, depending on how
long you have owned the shares ("contingent deferred sales charge," or
"CDSC"); (iii) Class C shares which impose no  front-end sales charge but may
impose a CDSC if shares are sold within one year, or (iv) Class I, for
institutional or other investors able to maintain a $1,000,000 minimum account
balance.  Class C shares are not available through all brokers.  Class B and C
shares have a higher level of expenses than Class A shares, including higher
Rule 12b-1 fees.  Class I has the lowest level of expenses.  These
alternatives permit you to choose the method of purchasing shares that is most
beneficial to you, depending on the amount of the purchase, the length of time
you expect to hold the shares, and other circumstances.  See "Alternative
Sales Options" for further details.  To open an account, call your broker, or
complete and return the enclosed Account Application.

Some classes of shares may not be available at this time.  Call Calvert at
1-800-368-2745 regarding class availability.

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

THE PORTFOLIO'S SHARES ARE NOT GUARANTEED OR INSURED BY THE FDIC OR ANY OTHER
AGENCY OF THE U.S. GOVERNMENT, NOR ARE THE SHARES DEPOSITS OR OBLIGATIONS OF,
OR GUARANTEED OR ENDORSED BY, STATE STREET BANK AND TRUST COMPANY, OR ANY
OTHER BANK.  AS WITH ANY INVESTMENT IN COMMON STOCKS, WHICH ARE SUBJECT TO
WIDE FLUCTUATIONS IN MARKET VALUE, YOU COULD LOSE MONEY BY INVESTING IN THE
PORTFOLIO.

ABOUT THIS PROSPECTUS

Please read this Prospectus for information you should know before investing,
and keep it for future reference. A Statement of Additional Information for
the Portfolio dated the date of this Prospectus, has been filed with the
Securities and Exchange Commission and is incorporated by reference. This free
Statement is available upon request from the Portfolio: 800-368-2748.

The SEC maintains a Web site at http://www.sec.gov that contains the Statement
of Additional Information, material incorporated by reference, and other
information regarding the Portfolio.

PORTFOLIO EXPENSES

A.   Shareholder Transaction Costs     Class A    Class B    Class C    Class I

  Front-End Sales Charge on Purchases     4.75%    None       None       None
  (as a percentage of
   offering price)

  Maximum Contingent Deferred Sales       None    5.00%*      1.00%**     None
  Charge (as a percentage of original
  purchase price or redemption proceeds,
  as applicable)


      *A contingent deferred sales charge is imposed on the proceeds of Class
B shares redeemed within 6 years, subject to certain exceptions.  That charge
is imposed as a percentage of net asset value at the time of purchase or
redemption, whichever is less, and declines from 5% in the first year that
shares are held, to 4% in the second and third years, 3% in the fourth year,
2% in the fifth year, and 1% in the sixth year.  There is no charge on
redemptions of Class B shares held for more than six years.  See "Calculation
of Contingent Deferred Sales Charge" below.

**A contingent deferred sales charge is imposed on the proceeds of Class C
shares redeemed within one year, subject to certain exceptions.  That charge
is imposed as a percentage of net asset value at the time of purchase or
redemption, whichever is less.  See "Calculation of Contingent Deferred Sales
Charge".

      For each Class A, Class B, and Class C account with a balance of less
than $5,000, (less than $1,000 for individual retirement plan accounts) a
monthly account maintenance fee of $1.00 is charged.


B.     Annual Portfolio Operating   Class A  Class B     Class C        Class I
       Expenses 
       (as a percentage of average
       net assets)
       Management Fees (includes    0.75%    0.75%       0.75%          0.70%
       administrative fees)
       Rule 12b-1 Service and
        Distribution Fees           0.25%    1.00%       1.00%          None
       Other Expenses (Estimated    0.25%    0.75%       0.75%          0.05%
       after fee waiver/expense
       reimbursement by Advisor)
       Total Portfolio Operating    1.25%    2.50%       2.50%          0.75%
        Expenses (after fee
        waiver/expense
        reimbursement by Advisor)

C. Example:           You would pay the following expenses on a $1,000
                      investment, assuming: (1) 5% annual return; (2)
                      redemption at the end of each period, (3) for Class A
                      shares, payment of the maximum front-end sales charge at
                      the time of purchase and (4) for Class B shares, payment
                      of maximum applicable contingent deferred sales charge.

                                            1 Year            3 years
Class A                                     $60               $85
Class B
     Assuming a complete
     redemption at end of period            $77               $121
     Assuming no redemption                 $25               $78
Class C
     Assuming a complete
     redemption at end of period            $36               $78
     Assuming no redemption                 $25               $78
Class I                                     $8                $24

The example, which is hypothetical, should not be considered a representation
of past or future expenses. Actual expenses and return 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 (other than account maintenance
fees) that an investor in the Portfolio would bear directly (shareholder
transaction costs) or indirectly (annual portfolio operating expenses).

      A. Shareholder Transaction Costs are charges you pay when you buy or
sell shares of the Portfolio. See "Reduced Sales Charges" at Exhibit A to see
if you qualify for possible reductions in the sales charge applicable to Class
A shares.  If you request a wire redemption of less than $1,000, you will be
charged a $5 wire fee.

      B. Annual Portfolio Operating Expenses. Management Fees are paid by the
Portfolio to the Advisor for managing its investments and business affairs.
Management fees include the subadvisory fee paid by Calvert Asset Management
Company, Inc. (the "Advisor") to State Street Global Advisors (the
"Subadvisor"), and the administrative service fee paid by the Portfolio to
Calvert Administrative Services Company. The Portfolio incurs Other Expenses
for maintaining shareholder records, furnishing shareholder statements and
reports, and other services. Other expenses are based on estimates for the
current fiscal year. Management Fees and Other Expenses are reflected in the
Portfolio's daily share price and are not charged directly to individual
shareholder accounts. Please refer to "Management of the Portfolio" for
further information. The Advisor may voluntarily reimburse expenses of the
Portfolio or waive its fees. The Advisor may recapture from the Fund any fees
it waives or expenses it assumes, subject to certain limitations. Through
March 31, 1999, the Advisor has agreed to cap the Portfolios' expenses at
1.25% for Class A, 2.50% for Class B, 2.50% for Class C and 0.75% for Class I.
Gross Total Portfolio Operating Expenses during this period are expected to be
1.79% for Class A, 2.82% for Class B, 2.82% for Class C, and 0.83% for Class I.

The Class A, Class B and Class C Rule 12b-1 fees include an asset-based sales
charge. Thus, long-term Class A, Class B or Class C shareholders in the
Portfolio may pay more in total sales charges than the economic equivalent of
the maximum front-end sales charge permitted by rules of the National
Association of Securities Dealers, Inc. (the "NASD").  In addition to the
compensation itemized above (sales charge and Rule 12b-1 service and
distribution fees), certain broker/dealers and/or their salespersons may
receive other compensation for the distribution of the securities or for
services to the Portfolio.  See the Statement of Additional Information,
"Method of Distribution."

INVESTMENT OBJECTIVE AND POLICIES

Investment Objective

The Managed Index Portfolio (the "Portfolio") seeks to provide a total return
after expenses which exceeds over time the total return of the Russell 1000
Index. The Portfolio seeks to obtain this objective while maintaining risk
characteristics similar to those of the Russell 1000 Index and through
investment in equity securities that satisfy the Portfolio's investment and
social criteria.  There can be no assurance that the Portfolio will be
successful in meeting its objective.  Long-term capital growth may be achieved
as the Portfolio attempts to track its index. The Portfolio's investment
objective is not fundamental and, unless otherwise specified, its policies and
strategies are not fundamental. The investment objective and each
non-fundamental policy and strategy may be changed by the Fund's Board of
Trustees without shareholder approval.

INVESTMENT STRATEGY AND RELATED RISKS

Investment Strategy

The Portfolio follows an enhanced index management strategy.  This means that,
rather than passively holding a representative basket of securities designed
to match the Russell 1000 Index, the Subadvisor actively uses a proprietary
analytical model to attempt to enhance the Portfolio's performance, relative
to that index.

The first step of the investment strategy is to identify those stocks in the
Russell 1000 Index which meet the Portfolio's social screening criteria.  From
this list of stocks, the Subadvisor chooses stocks that closely mirror the
index in terms of various factors such as industry weightings, capitalization,
and yield.  By providing exposure to these various factors which affect
returns to match the factor exposure of the index, the Subadvisor seeks to
provide a return for the Portfolio that differs only minimally from the Index.
Even though certain industries are eliminated from the Portfolio by the
screens, the factor model permits mathematical substitutes which the
Subadvisor expects to mimic the return characteristics of the missing
industries and stocks.  The final step in the process is to apply the
Subadvisor's proprietary valuation method which attempts to identify the
stocks which have the greatest potential for superior performance.

Each security identified for potential investment is ranked according to two
separate  and relatively uncorrelated measures:  value and momentum of market
sentiment.  The value measure compares a company's assets, projected earnings
growth and cash flow growth with its stock price within the context of its
historical valuation.  The momentum measure of market sentiment examines
changes in market analysts' earnings estimates and ranks stocks by the
strength and consistency of those changes.  These two measures combine to
create a single composite score of each stock's attractiveness.  The Portfolio
is constructed from securities that meet its social criteria, weighted through
a quadratic optimization1 process that seeks to reduce risk vis-a-vis the
Russell 1000 Index.

The Portfolio will generally have at least 65% of its total assets invested in
securities represented in the Russell 1000 Index.  Any investments not in the
Index will meet the Portfolio's social screening criteria and be selected to
closely mirror the Index's risk/return characteristics.  The Subadviser
expects to hold between 100 and 150 stocks.

The Russell 1000 index measures the performance of the 1,000 largest companies
in the Russell 3000 Index.  The Russell 3000 Index measures the performance of
the 3,000 largest US companies based on total market capitalization.  The
Index is adjusted, or reconstituted, annually.  As of the latest
reconstitution, the average market capitalization of the Russell 1000 was
approximately $7.6 billion; the median market capitalization was approximately
$3.0 billion.  The smallest company in the Russell 1000 Index had an
approximate market capitalization of $1.1 billion.

Tracking the Index

      The  Subadvisor  expects a tracking  error over time of no more than 2.5%,
although  there can be no guarantee  such results will be achieved.  The process
used by the  Portfolio  to attempt to track the Index  within this limit  relies
on assessing the difference  between the  Portfolio's  exposure to factors which
influence  returns and the Index's exposure to those same factors.  The combined
variability  of these factors and the  correlation  between  factors are used to
estimate  the  risk in the  Portfolio.  The  extent  to  which  the  total  risk
characteristics  of the  Portfolio  varies from that of the Index is active risk
or tracking error.

      The  Portfolio's   ability  to  track  the  index  will  be  monitored  by
analyzing  returns to ensure  that the returns are  reasonably  consistent  with
Index  returns.  By  regressing  Portfolio  returns  against  Index  returns the
Advisor can  calculate  the goodness of fit, as measured by the  Coefficient  of
Determination  or R  -squared.  Values  in excess  of 90%  indicate  a very high
degree of  correlation  between the Portfolio and the Index.  The Portfolio will
also be  monitored  to  ensure  that  general  characteristics,  such as  sector
exposures,  capitalization  and valuation  criteria,  are relatively  consistent
over time.

         Any deviations of realized returns from the Index which are in excess
of those expected will be analyzed for sources of variance.  Where variations
are deemed to be systematic or associated with a particular feature of the
investment process, the constraints on the Portfolio associated with that
factor may be adjusted to ensure a higher degree of correlation to the Index.

Risks

An index fund has operating expenses; a market index does not.  The Portfolio
- - while expected to track its target index as closely as possible while
satisfying its investment  and social criteria - will not be able to match the
performance of the index exactly.  The Portfolio is not sponsored, sold,
promoted, or endorsed by the Frank Russell Company.

1 An optimizer is a mathematical algorithm for maximizing or minimizing an
objective function relative to some set of constraints - here, to minimize
tracking error (active risk) while using only those stocks which pass the
Portfolio's social screens and limiting transaction costs.
<PAGE>


The Portfolio is subject to market risk, which is the possibility that stock
prices overall will decline over short or even extended periods.  Stock
markets tend to move in cycles, with periods of rising stock prices and
periods of falling stock prices. The Portfolio's total return and share price
will fluctuate within a wide range, so an investor could lose money over short
or even extended periods.

In seeking returns consistent with the Russell 1000 Index universe of stocks,
the Portfolio will normally be as fully invested as practicable in stocks or
their equivalents.  The Portfolio does not currently anticipate holding more
than 5% of its net assets in cash or cash equivalents.

The Portfolio may use stock futures and options as part of its investment
strategy

Besides investing in the stocks found in the Russell 1000 Index, the Portfolio
may also follow a number of other investment policies to achieve its
objective. These techniques may involve derivative transactions such as buying
and selling futures contracts and options on futures. The Portfolio can use
these practices for liquidity and to seek to hedge cash exposure in the
Portfolio. The decision to invest in these instruments will be based on market
conditions, regulatory limits and tax considerations. There can be no
assurance that engaging in options, futures, or any other investment strategy
will be successful.  If market values or other economic factors are misgauged,
the Portfolio may be worse off than had it not employed the strategy.  If
market conditions are judged incorrectly, if a strategy does not correlate
well with the Portfolio's investments, or if the counterparty to the
transaction does not perform as promised, these techniques could result in a
loss. These techniques may increase the volatility of the Portfolio and may
involve a small investment of cash relative to the magnitude of the risk
assumed.  The use of these strategies may result in a disadvantage to the
Portfolio if it is not able to purchase or sell a portfolio holding at an
optimal time due to the need to cover its transaction in its segregated
account, or due to the inability of the Portfolio to liquidate its position
because of its relative illiquidity. See the Statement of Additional
Information for more details about these strategies and limitations on
illiquid securities.

Borrowing/Repurchase Agreements/Securities Lending

The Portfolio may borrow money from banks (and pledge its assets to secure
such borrowing) for temporary or emergency purposes, but not for leverage.
Such borrowing may not exceed one third of the value of the Portfolio's total
assets.  The Portfolio may also invest in repurchase agreements with
recognized securities dealers and banks determined to present minimal credit
risk by the Advisor.  The Portfolio may lend its securities. The Portfolio has
no current intention to use borrowing, repurchase agreements or securities
lending with respect to more than 5%, respectively, of the Portfolio's net
assets.

Additional policies and restrictions

The Portfolio's Statement of Additional Information describes additional
policies and restrictions concerning the investments of the Portfolio.

SOCIALLY RESPONSIBLE INVESTMENT CRITERIA

EACH INVESTMENT IS SELECTED WITH A CONCERN FOR ITS SOCIAL IMPACT

         The Portfolio invests in accordance with its philosophy that
long-term rewards to investors will come from those organizations whose
products, services, and methods enhance the human condition and the
traditional American values of individual initiative, equality of opportunity
and cooperative effort.

         The Portfolio applies the following criteria for the selection of
organizations in which it invests. The Portfolio recognizes, however, that
these criteria represent standards of behavior which few, if any,
organizations totally satisfy and that, as a matter of practice, evaluation of
a particular organization in the context of these criteria will involve
subjective judgment by the Advisor.

         Given these considerations, the Portfolio seeks to invest in a
producer or service provider which:

         1.   Delivers safe products and services in ways which sustain our
              natural environment. For example, the Portfolio looks for
              companies that produce energy from renewable resources, while
              avoiding consistent polluters.

         2.   Is managed with participation throughout the organization in
              defining and achieving objectives. For example, the Portfolio
              looks for companies that offer employee stock ownership or
              profit-sharing plans.

         3.   Negotiates fairly with its workers, provides an environment
              supportive of their wellness, does not discriminate on the basis
              of race, gender, religion, age, disability, ethnic origin, or
              sexual orientation, does not consistently violate regulations of
              the Equal Employment Opportunity Commission, and provides
              opportunities for women, disadvantaged minorities, and others
              for whom equal opportunities have often been denied. For
              example, the Portfolio considers both unionized and non-union
              firms with good labor relations.

         4.   Fosters awareness of a commitment to human goals, such as
              creativity, productivity, self-respect and responsibility,
              within the organization and the world, and continually recreates
              a context within which these goals can be realized. For example,
              the Portfolio looks for companies with an above average
              commitment to community affairs and charitable giving.

         The Portfolio will not invest in an issuer which the Advisor
determines to be significantly engaged in:

         1.   The production of nuclear energy or the manufacture of equipment
              to produce nuclear energy.

         2.   Business activities in support of repressive regimes.

         3.   The manufacture of weapon systems.

         4.   The manufacture of alcoholic beverages or tobacco products.

         5.    The operation of gambling casinos.

The Portfolio believes that social and technological change will continue to
transform America and the world into the next century. Those enterprises which
exhibit a social awareness measured in terms of the above attributes and
considerations should be better prepared to meet future societal needs for
goods and services. By responding to social concerns, these enterprises should
maintain flexibility and further social goals. In so doing they should not
only avoid the liability that may be incurred when a product or service is
determined to have a negative social impact or has outlived its usefulness,
but also be better positioned to develop opportunities to make a profitable
contribution to society. These enterprises should be ready to respond to
external demands and ensure that over the longer term they will be viable to
provide a positive return to both investors and society as a whole.

With respect to U.S. government securities, the Portfolio invests primarily in
debt obligations issued or guaranteed by agencies or instrumentalities of the
U.S. Government whose purposes further or are compatible with the Portfolio's
social criteria, such as obligations of the Student Loan Marketing
Association, rather than general obligations of the U.S. Government, such as
Treasury securities.

The above social screening criteria may be changed by the Board of Trustees
without shareholder approval.

TOTAL RETURN

The Portfolio may advertise total return for each class. Total return is based
on historical results and is not intended to indicate future performance.

Total return includes not only the effect of income dividends but also any
change in net asset value, or principal amount, during the stated period.  A
cumulative total return reflects the performance of the class over a stated
period of time. An average annual total return reflects the hypothetical
annual compounded return that would have produced the same cumulative total
return if the performance had been constant over the entire period. Because
average annual returns tend to smooth out variations in the returns, you
should recognize that they are not the same as actual year-by-year results.
Both types of total returns for Class A shares usually will include the effect
of paying the front-end sales charge, or CDSC in the case of Class B and C
shares.  Of course, total returns will be higher if sales charges are not
taken into account.  Quotations of "return without maximum sales charge" do
not reflect deduction of the sales charge.  You should consider these figures
only if you qualify for a reduced sales charge, or for purposes of comparison
with comparable figures which also do not reflect sales charges, such as
mutual fund averages compiled by Lipper Analytical Services, Inc. Further
information about the Portfolio's performance is contained in its Annual
Report to Shareholders, which may be obtained without charge.

MANAGEMENT OF THE PORTFOLIO

The Board of Trustees supervises the Portfolio's activities and reviews its
contracts with companies that provide services to the Portfolio.

The Portfolio is a diversified series of Calvert Social Investment Fund (the
"Trust"), an open-end management investment company organized as a
Massachusetts business trust on December 14, 1981. The other series of the
Trust are the Managed Growth, Bond, Equity and Money Market Portfolios.

The Trust is not required to hold annual shareholder meetings, but special
meetings may be called for purposes such as electing Trustees, changing
fundamental policies, or approving a management contract. As a shareholder, you
receive one vote for each share of the Portfolio you own. Matters affecting
classes differently, such as Distribution Plans, will be voted on separately
by the affected class.

<PAGE>

Board of Trustees

REBECCA ADAMSON
President, First Nations Development Institute

RICHARD L. BAIRD, JR.
Executive Vice President, Family Health Council, Inc.

JOHN G. GUFFEY, JR.
Co-Chair, Calvert Social Investment Foundation
Treasurer and Director, Silby, Guffey & Co., Inc.

JOY V. JONES, Esq.
Attorney and Entertainment Manager

BARBARA J. KRUMSIEK
President, Chief Executive Officer and Vice Chair, Calvert Group, Ltd. and
subsidiaries

TERRENCE J. MOLLNER, Ed.D.
Founder and Chair, Trusteeship Institute, Inc.
Co-Chair, Calvert Social Investment Foundation

(Ms.) SYDNEY AMARA MORRIS
Unitarian Church of Vancouver, Canada

CHARLES T. NASON
Chairman, President, and Chief Executive Officer, The Acacia Group

D. WAYNE SILBY
President, Secretary, and Director, Silby, Guffey & Co., Inc.
Chair, CSIF Board of Trustees

Advisory Council

The Advisory Council is a resource to the Fund's Board of Trustees regarding
communication networks for the Fund and the application and refinement of the
Fund's social criteria.

TIMOTHY SMITH
(Chair) Executive Director, Interfaith Center on Corporate Responsibility

ROBERT BROWNE
President, Twenty-First Century Foundation

WILLIAM J. BYNUM
President and CEO, Enterprise Corporation for the Delta

JACK CHIN
Coordinator, Funder's Forum on Environmental Education


FRED DAVIE
Program Officer, Community and Resource Development, Ford Foundation

MARIAN WRIGHT EDELMAN
President & Founder, Children's Defense Fund

MICHAEL FISCHER
Program Officer, William and Flora Hewlett Foundation

ELIZABETH HARRIS
Vice President, UNC Partners, Inc.

SOPHIA BRACEY HARRIS
Founder and Executive Director, The Federation of Childcare Centers of
Alabama, Inc.

JAMES E. HEARD
President, Breakwater Holdings

HAZEL HENDERSON
Independent Futurist and Author

ERICA HUNT
Executive Director, Twenty-First Century Foundation

GRACE LECLAIR
Writer, Consultant and Theorist Concerning the Impacts of Economics on Family
and Community Life

KAI LEE
Professor of Environmental Studies and Director of the Center for
Environmental Studies, Williams College

JESSICA LIPNACK
President, The Networking Institute, Inc.

ROBERT CARTER RANDOLPH
Attorney and Mediator/Arbitrator Washington Arbitration and Mediaton Services

RUSTUM ROY
Professor of Geochemistry, Pennsylvania State University

BYRON RUSHING
State Representative, Massachusetts

MARC DAVID SARKADY
Leadership Consultant and International Facilitator

GAIL SNOWDEN
Group Executive, Community Banking Group, Bank of Boston

JEFFREY STAMPS
Chairman, The Networking Institute, Inc.

THOMAS STONEBACK
Vice President and Chief Administrative Officer, Rodale Press, Inc.

DARRELD RAY TURNER, II
Policy Advisor, Cherokee Nation of Oklahoma

DIANE WHITE
Owner, Blackberry

D. Wayne Silby, Chair of the Fund's Board of Trustees, serves as an ex officio
member of the Advisory Council.

Calvert Asset Management Company, Inc. serves as Advisor to the Portfolio.

Calvert Asset Management Company, Inc. ("CAMCO" or the "Advisor") is the
Portfolio's investment advisor. Founded in 1976, CAMCO serves as investment
advisor to over 30 mutual funds, including the first and largest family of
socially screened funds.  CAMCO assets under management as of December 31,
1997 exceeded $5 billion. The Advisor provides the Portfolio with investment
supervision and management, certain administrative services and office space;
furnishes executive and other personnel to the Portfolio; and pays the
salaries and fees of all Trustees who are employees of the Advisor or its
affiliates. The Advisor may also assume and pay certain advertising and
promotional expenses of the Portfolio and reserves the right to compensate
broker-dealers in return for their promotional or administrative services. The
Portfolio pays all other operating expenses as noted in the Statement of
Additional Information.

Calvert Group is One of the Largest Investment Management Firms in the
Washington, D.C. Area.

Calvert Group, Ltd., parent of the Portfolio's investment advisor, shareholder
servicing agent, and distributor, is a subsidiary of Acacia Mutual Life
Insurance Company of Washington, D.C. Calvert Group is one of the largest
investment management firms in the Washington, D.C. area. Calvert Group, Ltd.
and its subsidiaries are located at 4550 Montgomery Avenue, Suite 1000N,
Bethesda, Maryland 20814.

State Street Global Advisors is the Portfolio's Subadvisor.

State Street Global Advisors ("Subadvisor" or "SSGA"), a division of State
Street Bank & Trust Company ("State Street"), is the Subadvisor to the
Portfolio. Its principal business office is located at 225 Franklin Street,
Boston, Massachusetts, USA. With over $400 billion  under management SSGA
provides complete global investment management services from offices in the
United States, London, Sydney, Hong Kong, Tokyo, Toronto, Montreal, and Paris.
The Subadvisor's Global Enhanced Index Products Group manages the investment
and reinvestment of the assets of the Portfolio, although the Advisor screens
potential investments for compatibility with the Portfolio's social criteria.

State Street is one of the largest providers of securities processing and
record keeping services for U.S. mutual funds and pension funds and a pioneer
in the development of U.S. and international index funds.  State Street is a
wholly owned subsidiary of State Street Corporation, a publicly held bank
holding company.

The Trust has obtained an exemptive order from the Securities and Exchange
Commission to permit the Portfolio, pursuant to approval by the Board of
Trustees, to enter into and materially amend contracts with the Portfolio's
Subadvisor (including replacing the Subadvisor) without shareholder approval.
See "Investment Advisor and Subadvisor" in the Statement of Additional
Information for further details.



The Advisor receives a fee based on a percentage of the Portfolio's assets.

Pursuant to the Investment Advisory Agreement, the Portfolio pays the Advisor
an annual fee, payable monthly, of 0.60% of the Portfolio's average daily net
assets. From this, the Advisor pays the Subadvisor an annual fee, payable
monthly of 0.35% of the Portfolio's average daily net assets, subject to a
minimum annual fee of $150,000.

The Advisor may, in its discretion, defer its fees or assume certain of the
Portfolio's operating expenses.  The Investment Advisory Agreement provides
that the Advisor may later, to the extent permitted by law, recapture any fees
it deferred, or expenses it assumed during the two prior years.

Calvert Administrative Services Company provides administrative services for
the Portfolio.

Calvert Administrative Services Company ("CASC"), an affiliate of the Advisor,
provides certain administrative services for the Portfolio, including the
preparation of regulatory filings and shareholder reports, the determination
of periodic distributions per share, and the maintenance of certain portfolio
and general accounting records. For providing such services, CASC receives an
annual fee from the Portfolio, payable monthly, of 0.15% of the Portfolio's
average daily net assets for each of Class A, Class B and Class C Shares, and
0.10% for Class I Shares.

Calvert Distributors, Inc. serves as underwriter to market the Portfolio's
shares.

Calvert Distributors, Inc. ("CDI") is the Portfolio's principal underwriter
and distributor. Under the terms of its underwriting agreement with the
Portfolio, CDI markets and distributes the Portfolio's shares and is
responsible for payment of commissions and remitting distribution and/or
service fees to broker-dealers, banks, and financial services firms,
preparation of advertising and sales literature, and printing and mailing of
prospectuses to prospective investors.

The transfer agent keeps your account records.

Calvert Shareholder Services, Inc. is the Portfolio's shareholder servicing
agent. National Financial Data Services, Inc. 1004 Baltimore, Kansas City,
Missouri, 64105, is the transfer and dividend disbursing agent.

SHAREHOLDER GUIDE

Opening An Account

You can buy shares of the Portfolio in several ways.

An account application accompanies this prospectus. A completed and signed
application is required for each new account you open, regardless of the
method you choose for making your initial investment. Additional forms may be
required from corporations, associations, and certain fiduciaries. If you have
any questions or need extra applications, call your broker, or Calvert Group
at 800-368-2748. Be sure to specify which class you wish to purchase.

To invest through any of Calvert's tax-deferred retirement plans, please call
Calvert Group at 800-368-2748 to receive information and the required separate
application.


<PAGE>

Alternative Sales Options
The Portfolio offers four classes of shares:

Class A Shares - Front-End Load Option

Class A shares are sold with a front-end sales charge at the time of
purchase.  Class A shares are not subject to a sales charge when they are
redeemed.

Class B Shares - Back-End Load Option

Class B shares are sold without a sales charge at the time of purchase, but
are subject to a deferred sales charge if they are redeemed within six
calendar years after purchase.  Class B shares will automatically convert to
Class A shares at the end of eight calendar years after purchase.
 
Class C Shares - Level Load Option

Class C shares are sold without a front-end sales charge at the time of
purchase. They are subject to a deferred sales charge if they are redeemed
within one year after purchase.

Class I Shares - Institutional Option

Class I shares require a minimum account balance of $1,000,000.  They have no
sales charge or Distribution Plan.

Class B and C shares have higher expenses.

The Portfolio bears some of the costs of selling its shares under Distribution
Plans with respect to its Class A, B and C shares pursuant to Rule 12b-1 under
the Investment Company Act of 1940.  Payments under the Class A Distribution
Plan are limited to 0.25% annually of the average daily net asset value of
Class A shares, while payments under the Class B and C Distribution Plan are
1.00% annually of the average daily net asset attributable to their respective
classes.

Considerations for deciding which class of shares to buy.

Income distributions for Class A shares will probably be higher than those for
Class B and C shares, as a result of the distribution expenses described
above.  (See also "Total Returns.")  You should consider Class A shares if you
qualify for a reduced sales charge under Class A or if you plan to hold the
shares for several years.  The Portfolio will not normally accept any purchase
of Class B shares in the amount of $500,000 or more. Class C shares are not
available for investments of $1 million or more, and are not available through
all brokers.  Brokers or others may receive different levels of compensation
depending on which class of shares they sell.  You should consider Class I
shares if you are able to maintain a minimum account balance of $1,000,000.


<PAGE>

Class A Shares

Class A shares are offered at net asset value plus a front-end sales charge as
follows:

Amount of                  As a % of         As a % of   Allowed to Dealers  
Investment                 net amount        net amount  as a % of offering
price                      offering          Invested    price                 

 
Less than $50,000          4.75%               4.99%         4.00%
$50,000 but less
than $100,000              3.75%               3.90%         3.00%
$100,000 but less
than $250,000              2.75%               2.83%         2.25%
$250,000 but less
than $500,000              1.75%               1.78%         1.25%
$500,000 but less
than $1,000,000            1.00%               1.01%         0.80%
$1,000,000 and over        0.00%               0.00%         0.00%*

Front-end sales charges on shares may be reduced or eliminated in certain
cases. See Exhibit A to this prospectus.

The sales charge is paid to CDI, which in turn normally reallows a portion to
your broker-dealer. Upon written notice to dealers with whom it has dealer
agreements, CDI may reallow up to the full applicable sales charge. Dealers to
whom 90% or more of the entire sales charge is reallowed may be deemed to be
underwriters under the Securities Act of 1933.

Class A Distribution Plan

The Portfolio has adopted a Distribution Plan with respect to its Class A
shares (the "Class A Distribution Plan"), which provides for payments at a
maximum annual rate of 0.25% of the average daily net asset value of Class A
shares, to pay expenses associated with the distribution and servicing of
Class A shares. Amounts paid by the Portfolio to CDI under the Class A
Distribution Plan are used to pay to dealers and others, including CDI
salespersons who service accounts, service fees at an annual rate of up to
0.25% of the average daily net asset value of Class A shares, and to pay CDI
for its marketing and distribution expenses, including, but not limited to,
preparation of advertising and sales literature and the printing and mailing
of prospectuses to prospective investors.


*CDI may pay the dealer a finder's fee of up to 0.50% of the amount of
purchase on purchases of over $1 million.  If paid, CDI reserves the right to
recoup any portion of the amount paid to the dealer if the investor redeems
some or all shares within twelve months of the time of purchase.
<PAGE>

Class B Shares

Class B shares are offered at net asset value, without a front-end sales
charge.  With certain exceptions, the Portfolio may impose a deferred sales
charge at the time of redemption as follows:

 
                                           Contingent Deferred Sales
                                           Charge As A Percentage Of
Redemption During                          Net Asset Value At Redemption

1st Year Since Purchase                           5%
2nd Year Since Purchase                           4%
3rd Year Since Purchase                           4%
4th Year Since Purchase                           3%
5th Year Since Purchase                           2%
6th Year Since Purchase                           1%
7th Year Since Purchase and                      None
Thereafter

No deferred sales charge is imposed on amounts redeemed after six years from
purchase.  If imposed, the deferred sales charge is deducted from the
redemption proceeds otherwise payable to you.  The deferred sales charge is
retained by CDI.  See "Calculation of Contingent Deferred Sales Charges and
Waiver of Sales Charges" below.

Class B shares that have been outstanding for eight calendar years will
automatically convert to Class A shares, which are subject to a lower
Distribution Plan charge, without imposition of a front-end sales charge or
exchange fee.  The Class B shares so converted will no longer be subject to
the higher expenses borne by Class B shares.  Because the net asset value per
share of the Class A shares may be higher or lower than that of the Class B
shares at the time of conversion, although the dollar value will be the same,
a shareholder may receive more or less Class A shares than the number of Class
B shares converted.  Under current law, it is the Advisor's opinion that such
a conversion will not constitute a taxable event under federal income tax
law.  In the event that this ceases to be the case, the Board of Trustees will
consider what action, if any, is appropriate and in the best interests of the
Class B shareholders.

Class B Distribution Plan

The Portfolio has adopted a Distribution Plan with respect to its Class B
shares (the "Class B Distribution Plan"), which provides for payments at an
annual rate of up to 1.00% of the average daily net asset value of Class B
shares, to pay expenses of the distribution of Class B shares.  Amounts paid
by the Portfolio under the Class B Distribution Plan are currently used by CDI
to pay others (1) a commission at the time of purchase of 4% of the value of
each share sold; and/or (2) service fees at an annual rate of 0.25% of the
average daily net asset value of shares sold by such others, beginning in the
13th month after purchase.

Class C Shares

Class C shares are offered at net asset value, without a front-end sales
charge.  With certain exceptions, the Portfolio may impose a deferred sales
charge of 1.00% on shares redeemed during the first year after purchase.  If
imposed, the deferred sales charge is deducted from the redemption proceeds
otherwise payable to you.  The deferred sales charge is retained by CDI.  See
"Calculation of Contingent Deferred Sales Charges and Waiver of Sales Charges"
below.



<PAGE>

Class C Distribution Plan

The Portfolio has adopted a Distribution Plan with respect to its Class C
shares (the "Class C Distribution Plan"), which provides for payments at an
annual rate of up to 1.00% of the average daily net asset value of Class C
shares, to pay expenses of the distribution and servicing of Class C shares.
Amounts paid by the Portfolio under the Class C Distribution Plan are
currently used by CDI to pay dealers and other selling firms (1) a commission
at the time of purchase of 1.00% of the value of each share sold, and (2)
beginning in the 13th month after purchase, quarterly compensation at an
annual rate of up to 0.75%, plus a service fee as described above under "Class
A Distribution Plan," of up to 0.25%.

Calculation of Contingent Deferred Sales Charge and Waiver of Sales Charges

Class B and Class C shares that are redeemed will not be subject to a
contingent deferred charge to the extent that the value of such shares
represents (1) reinvestment of dividends or capital gains distributions, (2)
shares held more than six years (more than one year for Class C) or (3)
capital appreciation of shares redeemed.  Any contingent deferred sales
charge is imposed on the net asset value of the shares at the time of
redemption or purchase, whichever is lower.  Upon request for redemption,
shares not subject to the contingent deferred sales charge will be redeemed
first.  Thereafter, shares held the longest will be the first to be redeemed.

The contingent deferred sales charge on Class B Shares will be waived in the
following circumstances: (1) redemption upon the death or disability of the
shareholder, plan participant, or beneficiary ("disability" shall mean a total
disability as evidenced by a determination by the federal Social Security
Administration); (2) minimum required distributions from retirement plan
accounts for shareholders 70 (OMEGA) and older (with the maximum amount
subject to this waiver being based only upon the shareholder's Calvert
retirement accounts); (3) return of an excess contribution or deferral
amounts, pursuant to sections 408(d)(4) or (4), 401(k)(8), or 402)(g)(2), or
401(m)(6) of the Internal Revenue Code; (4) involuntary redemptions of
accounts under procedures set forth by the Fund's Board of Trustees; (5) a
single annual withdrawal under a systematic withdrawal plan of up to 10% per
year of the shareholder's account balance (minimum account balance $50,000 to
establish).

Arrangements with Broker-Dealers and Others

CDI may also pay additional concessions, including non-cash promotional
incentives, such as merchandise or trips, to dealers employing registered
representatives who have sold or are expected to sell a minimum dollar amount
of shares of the Portfolio and/or shares of other Portfolios underwritten by
CDI. CDI may make expense reimbursements for special training of a
broker-dealer's registered representatives, advertising or equipment, or to
defray the expenses of sales contests. Eligible marketing and distribution
expenses may be paid pursuant to the Portfolio's Rule 12b-1 Distribution Plan
and in compliance with the rules of the NASD.


<PAGE>

HOW TO BUY SHARES

(Be sure to specify which Class you are buying)

(For Class A, Class B and Class C Accounts:)

Method      New Accounts                         Additional
                                                 Investments

By Mail     $5,000 minimum                       $250 minimum

            Please make your check payable to    Please make your check
            the Portfolio and mail it with       payable to the Portfolio
            your application to:                 and mail it with your
                                                 investment slip to:


Calvert Group                       Calvert Group
P.O. Box 419544                     P.O. Box 419739
Kansas City, MO 64141-654           Kansas City, MO 64141-6739

By Registered, Certified, or Overnight Mail:
Calvert Group                       Calvert Group
c/o NFDS, 6th Floor                 c/o NFDS, 6th Floor
1004 Baltimore                      1004 Baltimore
Kansas City, MO 64105-1807          Kansas City, MO 64105-1807

Through
Your Financial
Professional               $5,000 minimum              $250 minimum

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

FOR ALL OPTIONS BELOW, PLEASE CALL YOUR FINANCIAL PROFESSIONAL OR CALVERT
GROUP AT 800-368-2745

By Exchange                $5,000 minimum              $250 minimum
(From your account in another Calvert Group Portfolio)

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.

By Bank Wire               $5,000 minimum              $250 minimum

By Calvert Money           Not Available               $250 minimum
Controller*                for Initial Investment

*Please allow sufficient time for Calvert Group to process your initial
request for this service, normally 10 business days. The maximum transaction
amount is $300,000, and your purchase request must be received by 4:00 p.m.
Eastern time.

(For Class I Accounts: Purchases must be by bank wire.  Minimum initial Class
I investment is $1 million; minimum subsequent Class I investment is $25,000--
Call Calvert at 800-368-2745 for details.

NET ASSET VALUE

Net asset value, or "NAV," refers to the worth of one share. NAV is computed
per class by adding the value of all portfolio holdings, plus other assets,
deducting liabilities, and then dividing the result by the number of shares
outstanding. This value is calculated at the close of the Portfolio'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 Portfolio is open for
business each day the New York Stock Exchange is open. All purchases of
Portfolio shares will be confirmed and credited to your account in full and
fractional shares (rounded to the nearest 1/1000th of a share).

Portfolio securities and other assets are valued based on market quotations,
except that securities maturing within 60 days are valued at amortized cost.
If quotations are not available, securities are valued by a method that the
Board of Trustees believes accurately reflects fair value. Financial futures
are valued at the settlement price established each day by the board of trade
or exchange on which they are traded.

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 next offering price based on the next
net asset value calculated after your order is received and accepted. All your
purchases must be made in U.S. dollars and checks must be drawn on U.S. banks.
No cash will be accepted. The Portfolio reserves the right to suspend the
offering of shares for a period of time or to reject any specific purchase
order. If your check does not clear, your purchase will be canceled and you
will be charged a $10 fee plus costs incurred by the Portfolio. When you
purchase by check or with Calvert Money Controller, the Portfolio may hold
payment on redemptions until it is reasonably satisfied that the investment is
collected (normally up to 10 business days from purchase date). To avoid this
collection period, you can wire federal Portfolios from your bank, which may
charge you a fee. As a convenience, check purchases can be received at
Calvert's offices for overnight mail delivery to the transfer agent and will
be credited the next business day or upon receipt.  Any check purchase
received without an investment slip may cause delayed crediting.

Certain financial institutions or broker-dealers which have entered into a
sales agreement with the Distributor may enter confirmed purchase orders on
behalf of customers by phone, with payment to follow within a number of days
of the order as specified by the program. If payment is not received in the
time specified, the financial institution could be held liable for resulting
fees or losses.

EXCHANGES

Each exchange represents the sale of shares of one Portfolio and the purchase
of shares of another. Therefore, you could realize a taxable gain or loss on
the transaction.

If your investment goals change, the Calvert Group 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. However, the Portfolio is
intended as a long-term investment and not for frequent short-term trades.
Before you make an exchange from the Portfolio, please note the following:

      Call your broker or a Calvert representative for information and a
     prospectus for any of Calvert's other Funds registered in your state.
     Read the prospectus of the Fund into which you want to exchange for
     relevant information, including class offerings. The exchange privilege
     is only available in states where shares of the Fund into which you want
     to exchange are registered for sale.

      Complete and sign an application for an account in the Fund into which
     you want to exchange, 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 you
     have not declined telephone transaction privileges and the shares are not
     in certificate form. See "Selling Your Shares" and "How to Sell Your
     Shares-- By Telephone and-- Exchange to Another Calvert Group Fund."

      You may exchange shares on which you have already paid a sales charge at
     Calvert Group and shares acquired by reinvestment of dividends or
     distributions into another Fund at no additional charge. Except for Class
     I, shares may only be exchanged for shares of the same Class of another
     Calvert Group Fund, except Class C shares may also be exchanged for Class
     B shares of Calvert First Government Money Market Fund. Class I shares
     may be exchanged for any Class.

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

      Shareholders (and those managing multiple accounts) who make two
     purchases and two exchange redemptions of shares of the Portfolio during
     any 6-month period will be given written notice that they may be
     prohibited from making additional investments. This policy does not
     prohibit a shareholder from redeeming shares of the Portfolio.

      For purposes of the exchange privilege, the Portfolio is related to
     Summit Cash Reserves Portfolio by investment and investor services.

      The Portfolio reserves the right to terminate or modify the exchange
     privilege in the future upon 60 days' written notice.

          OTHER CALVERT GROUP SERVICES

Calvert Information Network

24 hour performance and price information

Calvert Group has a round-the-clock telephone service for most classes and a
website at http://www.calvertgroup.com that lets existing customers obtain
prices, yields, performance information, account balances, and, by telephone
only, authorize certain transactions.

Calvert Money Controller

Calvert Money Controller eliminates the delay of mailing a check or the
expense of wiring funds. You can request this free service on your application.

This service allows you to authorize electronic transfers of money to purchase
or sell shares. You use Calvert Money Controller like an "electronic check" to
move money ($250 to $300,000) between your bank account and your account in
the Portfolio with one phone call. Allow two business days after the call for
the transfer to take place; for money recently invested, allow normal check
clearing time (up to 10 business days) before redemption proceeds are sent to
your bank. All Calvert Money Controller transaction requests must be received
by 4:00 p.m. Eastern time in order to be processed on that business day.

You may also arrange systematic monthly or quarterly investments (minimum
$250) into your Portfolio account. After you give us proper authorization, your
bank account will be debited to purchase Portfolio shares. A debit entry will
appear on your bank statement. Share purchases made through Calvert Money
Controller will be subject to the applicable sales charge. If you would like
to make arrangements for systematic monthly or quarterly redemptions from your
Calvert account, call your broker or Calvert for a Money Controller
Application.

Telephone Transactions

Calvert may record all telephone calls.

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

Optional 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 your
broker or Calvert Investor Relations at 800-368-2745 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.

Householding of General Mailings

Householding reduces Portfolio expenses and saves paper and trees for the
environment.

If you have multiple accounts with Calvert, you may receive combined mailings
of some shareholder information, such as statements, confirmations,
prospectuses, semi-annual and annual reports. Please contact Calvert Investor
Relations at 800-368-2745 to receive additional copies of information.

Special Services and Charges

The Portfolio 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.

If you are purchasing shares of the Portfolio through a program of services
offered by a broker-dealer or financial institution, you should read the
program materials in conjunction with this Prospectus. Certain features of the
Portfolio may be modified in these programs, and administrative charges may be
imposed  by the broker-dealer or financial institution for the services
rendered.

Tax-Saving Retirement Plans

Contact Calvert Group for complete information kits discussing the plans and
their benefits, provisions and fees.

Calvert Group can set up your new account in the Portfolio under one of
several tax-deferred plans. These plans let you invest for retirement and
shelter your investment income from current taxes. Minimums may differ from
those listed in the "How to Buy Shares" chart. Also, reduced sales charges may
apply.  See "Exhibit A-Reduced Sales Charges."

      Traditional and Roth individual retirement accounts (IRAs): available to
     anyone who has earned income. You may also be able to make investments in
     the name of your spouse, if your spouse has no earned income.

      Qualified Profit-Sharing and Money Purchase Plans (including 401(k)
     Plans): available to self-employed people and their partners,
     corporations and their employees, and certain tax-exempt organizations.

      Simple IRA and Simplified Employee Pension Plan (SEP-IRA): available to
     self-employed people and their partners, or to corporations.

      403(b)(7) Custodial Accounts: available to employees of most non-profit
     organizations and public schools and universities.

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 (less any CDSC).  See below for specific
requirements necessary to make sure your redemption request is accepted.
Remember that the Portfolio may hold payment on the redemption of your shares
until it is reasonably satisfied that investments made by check or by Calvert
Money Controller have been collected (normally up to 10 business days).
Redemptions may be made in kind if, in the sole opinion of the Advisor, it is
in the best interest of the Portfolio to do so.

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 Portfolio, it may take up to 7 days. Calvert Money Controller redemptions
generally will be credited to your bank account on the second business day
after your phone call. 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.

Minimum account balance is $5,000, for Class A, B and C;$1,000,000 for Class I.

Please maintain the minimum balance in your account . Otherwise, a monthly
$1.00 account maintenance fee will be charged (fee not applicable to Class I).

Mail Redemption Requests To:

Calvert Group
P.O. Box 419544
Kansas City, MO.

You may redeem available funds from your account at any time by sending a
letter of instruction, including your name, account and Portfolio 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. To add instructions to wire to a
destination not previously established, or if you would like funds sent to a
different address or another person, your letter must be signature guaranteed.

Type of Registration                                 Requirements

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

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

By Telephone

Please call 800-368-2745. You may redeem shares from your account by telephone
and have your money mailed to your address of record or wired to an address or
bank you have previously authorized. A charge of $5 is imposed on wire
transfers of less than $1,000. See "Telephone Transactions." Class I
redemptions must be made by wire.

Calvert Money Controller

Please allow sufficient time for Calvert Group to process your initial request
for this service (normally 10 business days). Your request for a redemption by
this service must be received by 4:00 p.m. Eastern time. Accounts cannot be
closed by this service.  Unless they otherwise qualify for a waiver, Class B
or Class C shares redeemed by Calvert Money Controller will be subject to the
Contingent Deferred Sales Charge.

Exchange to Another Calvert Group Fund

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

Systematic Check Redemptions

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

Through your Broker

If your account is held in your broker's name ("street name"), you should
contact your broker directly to transfer, exchange or redeem shares.

DIVIDENDS, DISTRIBUTIONS AND TAXES

Each year, the Portfolio distributes substantially all of its net investment
income and capital gains to shareholders.

Dividends from the Portfolio's net investment income are declared and paid
annually. Net investment income generally consists of the interest income,
profits from securities loans, net short-term capital gains, if any, and
dividends, less expenses. Distributions of net long-term capital gains, if
any, are normally declared and paid by the Portfolio once a year; however, the
Portfolio does not anticipate making any such distributions unless available
capital loss carryovers have been used or have expired. Dividend and
distribution payments will vary among classes because of different fees.

Distribution Payment Options

Dividends and distributions are automatically reinvested in additional shares,
unless on the account application you request to have them paid to you in cash
(by check or by Calvert Money Controller). You may also request to have your
dividends and distributions from the Portfolio invested at net asset value
("NAV") in shares of any other Calvert Group Portfolio. If you choose to have
them reinvested in the same Portfolio, the new shares will be purchased at the
NAV (no sales charge) on the reinvest date, which is generally 1 to 3 days
prior to the payment date. You must be a shareholder on the record date to
receive dividends. You must notify the Portfolio in writing prior to the
record date if you want 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. No dividends will accrue on amounts represented by uncashed
distribution or redemption checks.

"Buying a Dividend"

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

Federal Taxes

The Portfolio normally distributes all net income and capital gain to
shareholders. These distributions are taxable to you regardless of whether
they are taken in cash or reinvested. Distributions of net investment income
are taxable as ordinary income; distributions of net long-term capital gains
are taxable as long-term capital gains regardless of how long you have held
the shares. Dividends and distributions declared during October, November or
December and paid in January of the following year are taxable in the year
they are declared. The Portfolio will mail you Form 1099-DIV in January
indicating the federal tax status of your dividends and any capital gain
distribution paid to you during the year. If distributions exceed the
Portfolio's net investment income and capital gain for the year, the excess
will reduce your tax basis for your shares in the Portfolio.

You may realize a capital gain or loss when you sell or exchange shares.

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

Taxpayer Identification Number, Back-up Withholding

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 Portfolio to withhold 31% of your dividends, capital gain
distributions, and redemptions. 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
Portfolio reserves the right to reject any new account or any purchase order
for failure to supply a certified TIN.

EXHIBIT A
REDUCED SALES CHARGES (CLASS A ONLY)

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

Right of Accumulation
The sales charge breakpoints are calculated by taking into account not only
the dollar amount of a new purchase of shares, but also the higher of cost or
current value of shares previously purchased in Calvert Group Funds that
impose sales charges. This automatically applies to your account for each new
purchase.

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

Group Purchases
If you are a member of a qualified group, you may purchase shares of the Fund
at the reduced sales charge applicable to the group taken as a whole. The
sales charge is calculated by taking into account not only the dollar amount
of the shares you purchase, but also the higher of cost or current value of
shares previously purchased and currently held by other members of your group.

A "qualified group" is one which:

 (1)      has been in existence for more than six months,
 (2)      has a purpose other than acquiring Fund shares at a discount, and
 (3)      satisfies uniform criteria which enable CDI and dealers offering
     Fund shares to realize economies of scale in distributing such shares.

A qualified group must have more than 10 members, must be available to arrange
for group meetings between representatives of CDI or dealers distributing the
Fund's shares, must agree to include sales and other materials related to the
Fund in its publications and mailings to members at reduced or no cost to CDI
or dealers.

Pension plans may not qualify participants for group purchases; however, such
plans may qualify for reduced sales charges under a separate provision (see
below). Members of a group are not eligible for a Letter of Intent.

Retirement Plans Under Section 457, Section 403(b)(7), or Section 401(k)
There is no sales charge on A shares of the Fund if they are for the benefit
of a retirement plan under section 457 of the I.R.C. of 1986, as amended, or
for a plan qualifying under section 403(b)(7) and 401(k) of the Code if, at
the time of purchase a) Calvert Group has been notified in writing that the
403(b)(7), or 401(k) plan has at least 200 eligible employees and is not
sponsored by a K-12 school district: or b) in the case of a 401(k) plan, the
cost or current value of shares the plan has in Calvert Group of Funds (except
money market funds) is at least $1 million.

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

Other Circumstances
There is no sales charge on shares of any fund (portfolio or series) of the
Calvert Group of Funds sold to:
(1) current and retired members of the Board of Trustees/Directors of the
Calvert Group of Funds, (and the Advisory Council of the Calvert Social
Investment Fund);
(2) directors, officers and employees of the Advisor, Distributor, and their
affiliated companies, and directors, officers and employees of the Subadvisor.
(3) directors, officers and registered representatives of brokers distributing
the Fund's shares; and immediate family members of persons listed in (1), (2),
or (3) above;
(4) dealers, brokers, or registered investment advisors that have entered into
an agreement with CDI providing specifically for the use of shares of the Fund
(Portfolio or Series) in particular investment programs or products (where
such program or product already has a fee charged therein) made available to
the clients of such dealer, broker, or registered investment advisor;
(5) trust departments of banks or savings institutions for trust clients of
such bank or savings institution; and
(6) purchases placed through a broker maintaining an omnibus account with the
Fund (Portfolio or Series) and the purchases are made by (a) investment
advisors or financial planners placing trades for their own accounts (or the
accounts of their clients) and who charge a management, consulting, or other
fee for their services; or (b) clients of such investment advisors or
financial planners who place trades for their own accounts if such accounts
are linked to the master account of such investment advisor or financial
planner on the books and records of the broker or agent; or (c) retirement and
deferred compensation plans and trusts, including, but not limited to, those
defined in Section 401(a) or Section 403(b) of the I.R.C., and "rabbi trusts."

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

Purchases made at net asset value ("NAV")
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.

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

<PAGE>
 


To Open an Account:
 800-368-2748                                Prospectus
                                             March 3, 1998
 
 
                                              Calvert Social Investment Fund
                                              Managed Index Portfolio


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

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

TDD for Hearing Impaired:
     800-541-1524

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

Registered, Certified
or Overnight Mail:
Calvert Group
c/o NFDS, 6th Floor
1004 Baltimore
Kansas City, MO 64105

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

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

Table of Contents

Portfolio Expenses                                            2
Investment Objective and Policies                             4
Investment Techniques and Related Risks                       4
Socially Responsible Investment Criteria                      6
Total Return                                                  8
Management of the Portfolio                                   8
SHAREHOLDER GUIDE:                                            12
Alternative Sales Options                                     13
How to Buy Shares                                             17
Net Asset Value                                               18
When Your Account Will Be Credited                            18
Exchanges                                                     18
Other Calvert Group Services                                  19
How to Sell Your Shares                                       21
Dividends, Distributions and Taxes                            23

- --------


<PAGE>




CALVERT SOCIAL INVESTMENT FUND
Managed Index Portfolio

Statement of Additional Information
March 3, 1998


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

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

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

TRANSFER AGENT
National Financial Data Services, Inc.
1004 Baltimore
6th Floor
Kansas City, Missouri 64105

INDEPENDENT ACCOUNTANTS
Coopers & Lybrand, L.L.P.
250 West Pratt Street
Baltimore, Maryland 21201


     TABLE OF CONTENTS

     Investment Objectives and Policies              1
     Backtesting Methodology and Results             3
     Investment Restrictions                         4
     Investment Selection and Screening Process      5
     Dividends and Taxes                             6
     Net Asset Value                                 6
     Calculation of Total Return                     7
     Purchase and Redemption of Shares               7
     Reduced Sales Charges (Class A)                 8
     Advertising                                     8
     Trustees, Officers and Advisory Council         9
     Investment Advisor                              11
     Method of Distribution                          12
     Transfer and Shareholder Servicing Agent        12
     Portfolio Transactions                          13
     Independent Accountants and Custodians          13
     General Information                             13
     Letter of Intent                                15
 

<PAGE>

STATEMENT OF ADDITIONAL INFORMATION- March 3, 1998


                            MANAGED INDEX PORTFOLIO
                4550 Montgomery Avenue, Bethesda, Maryland 20814

              New Account    (800) 368-2748     Shareholder
              Information:   (301) 951-4820     Services:(800) 368-2745
              Broker         (800) 368-2746     TDD for the Hearing-
              Services:      (301) 951-4850     Impaired:  (800) 541-1524

         This   Statement  of  Additional   Information  is  not  a  prospectus.
Investors  should read the Statement of Additional  Information  in  conjunction
with the  Portfolio's  Prospectus,  dated  March 3, 1998  which may be  obtained
free of charge by calling or writing the Portfolio at the above address.

                       INVESTMENT OBJECTIVES AND POLICIES

         Calvert  Social  Investment  Fund (the  "Fund") is  designed to provide
opportunities  for  individual  and  institutional  investors,  including  ERISA
fiduciaries,   through   investment  in  enterprises  that  make  a  significant
contribution  to society  through  their  products  and services and through the
way they do  business.  The Fund  offers  investors  a choice  of five  separate
portfolios  selected  with a concern for the social  impact of each  investment:
the Managed Index  Portfolio,  the Money Market  Portfolio,  the Managed  Growth
Portfolio,  the Equity  Portfolio  and the Bond  Portfolio.  This  Statement  of
Additional  Information  applies  only to the  Managed  Equity  Index  Portfolio
("Portfolio").

Repurchase Agreements
         The  Portfolio  may  purchase  debt  securities  subject to  repurchase
agreements  which are  arrangements  under which the  Portfolio  buys a security
and the seller  simultaneously  agrees to repurchase the security at a specified
time and price  reflecting a market rate of interest.  The Portfolio  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 Portfolio 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  Portfolio  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.  In addition,  the  Portfolio
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.  Repurchase  agreements are
always for periods of less than one year.  Repurchase  agreements not terminable
within seven days are considered illiquid.

Options and Futures Contracts
         The Portfolio  may, in pursuit of its investment  objective,  engage in
the  purchase  and sale of stock index  futures  contracts,  and options on such
futures, as described more fully below.
         The  Portfolio  may engage in such  transactions  only for liquidity or
to seek to hedge  cash  exposure.  It will not engage in such  transactions  for
the  purposes  of  speculation  or  leverage.  The use of  options  and  futures
contracts  may  involve a greater  degree of risk than  those  inherent  in more
conservative investment approaches.

Futures  Transactions.  The Portfolio  may purchase and sell futures  contracts,
but only when,  in the judgment of the Advisor,  or  Subadvisor  such a position
acts  as a hedge  against  market  changes  which  would  adversely  affect  the
securities held by the Portfolio.  These futures contracts may include,  but are
not limited to, market index futures  contracts and futures  contracts  based on
U.S. Government obligations.
         A futures  contract  is an  agreement  between  two  parties to buy and
sell a  security  on a future  date  which has the  effect of  establishing  the
current  price for the  security.  Although  futures  contracts  by their  terms
require  actual  delivery  and  acceptance  of  securities,  in most  cases  the
contracts  are  closed  out before the  settlement  date  without  the making or
taking of delivery  of  securities.  Upon buying or selling a futures  contract,
the Portfolio  deposits initial margin with its custodian,  and thereafter daily
payments  of  maintenance  margin  are made to and from  the  executing  broker.
Payments  of  maintenance  margin  reflect  changes in the value of the  futures
contract,  with the  Portfolio  being  obligated  to make such  payments  if its
futures  position  becomes less  valuable and entitled to receive such  payments
if its positions become more valuable.
         The  Portfolio  may only  invest in futures  contracts  and  options on
futures to hedge its cash and/or  securities  investment  positions  and not for
income  enhancement,  speculation  or leverage  purposes.  Although  some of the
securities   underlying  a  futures   contract  may  not  necessarily  meet  the
Portfolio's  social  criteria,  any such hedge  position  taken by the Portfolio
will not constitute a direct ownership interest in the underlying securities.
         Futures   contracts   are   designed  by  boards  of  trade  which  are
designated  "contracts  markets" by the  Commodity  Futures  Trading  Commission
("CFTC").  As  series of a  registered  investment  company,  the  Portfolio  is
eligible  for  exclusion   from  the  CFTC's   definition  of  "commodity   pool
operator,"  meaning that the  Portfolio  may invest in futures  contracts  under
specified conditions without registering with the CFTC.

Options on Futures  Contracts.  The Portfolio may purchase and write put or call
options and sell call options on futures  contracts  in which a Portfolio  could
otherwise  invest  and which are  traded on a U.S.  exchange  or board of trade.
The  Portfolio  may also enter into  closing  transactions  with respect to such
options  to  terminate  an  existing  position;  that is,  to sell a put  option
already  owned and to buy a call option to close a position  where the Portfolio
has already sold a corresponding call option.
         The  Portfolio  may only  invest in  options on  futures  contracts  to
hedge  its  existing  investment  positions  and  not  for  income  enhancement,
speculation or leverage  purposes.  Although some of the  securities  underlying
the  futures  contract  underlying  the  option  may not  necessarily  meet  the
Portfolio's  social  criteria,  any such hedge  position  taken by the Portfolio
will not constitute a direct ownership interest in the underlying securities.
         An option on a futures  contract  gives the  purchaser  the  right,  in
return for the premium paid, to assume a position in a futures  contract-a  long
position  if the  option  is a call  and a short  position  if the  option  is a
put-at a specified  exercise  price at any time during the period of the option.
The  Portfolio  will  pay a  premium  for such  options  purchased  or sold.  In
connection  with such options  bought or sold,  the Portfolio  will make initial
margin  deposits and make or receive  maintenance  margin payments which reflect
changes in the market  value of such  options.  This  arrangement  is similar to
the margin arrangements applicable to futures contracts described above.

Put  Options  on  Futures  Contracts.  The  purchase  of put  options on futures
contracts is analogous to the sale of futures  contracts  and is used to protect
the portfolio against the risk of declining  prices.  The Portfolio may purchase
put  options and sell put options on futures  contracts  that are already  owned
by the  Portfolio.  The  Portfolio  will  only  engage  in the  purchase  of put
options  and the sale of  covered  put  options  on  market  index  futures  for
hedging purposes.

Call Options on Futures  Contracts.  The Portfolio may only buy call options for
a cash hedge.

Risks of Options and Futures  Contracts.  If the  Portfolio  has sold futures or
takes  options  positions to hedge its portfolio  against  decline in the market
and the market later  advances,  the  Portfolio may suffer a loss on the futures
contracts or options which it would not have  experienced  if it had not hedged.
Correlation  is also  imperfect  between  movements  in the  prices  of  futures
contracts  and  movements in prices of the  securities  which are the subject of
the hedge.  Thus the price of the futures  contract or option may move more than
or less than the price of the  securities  being  hedged.  Where a Portfolio has
sold  futures  or taken  options  positions  to  hedge  against  decline  in the
market,  the  market may  advance  and the value of the  securities  held in the
Portfolio may decline.  If this were to occur,  the  Portfolio  might lose money
on the futures  contracts or options and also  experience a decline in the value
of its  portfolio  securities.  However,  although  this might occur for a brief
period or to a slight  degree,  the value of a diversified  portfolio  will tend
to move in the direction of the market generally.
         The  Portfolio can close out futures  positions  only on an exchange or
board of trade which provides a secondary  market in such futures.  Although the
Portfolio  intends to  purchase  or sell only such  futures  for which an active
secondary  market  appears  to  exist,  there  can be no  assurance  that such a
market will exist for any particular  futures  contract at any particular  time.
This might prevent the Portfolio  from closing a futures  position,  which could
require the  Portfolio to make daily cash  payments with respect to its position
in the event of adverse price movements.
         Options  on  futures  contracts  bear  several  risks  apart from those
inherent in options  transactions  generally.  The Portfolio's  ability to close
out its options  positions  in futures  contracts  will  depend upon  whether an
active  secondary  market for such  options  develops and is in existence at the
time the  Portfolio  seeks to close its  positions.  There  can be no  assurance
that such a market will  develop or exist.  Therefore,  the  Portfolio  might be
required to exercise the options to realize any profit.

Temporary defensive positions

In seeking  returns  consistent  with the Russell 1000  universe of stocks,  the
Portfolio  will  normally  be  as  fully  invested  as  practicable  in  stocks.
However,  for  temporary  defensive  purposes  - which  may  include  a lack of
adequate  purchase  candidates  or  an  unfavorable  market  environment  -  the
Portfolio may invest up to 35% of its assets in cash or cash  equivalents.  Cash
equivalents  include  instruments  such as, but not limited to, U.S.  government
and agency  obligations,  certificates of deposit,  banker's  acceptances,  time
deposits commercial paper,  short-term  corporate debt securities and repurchase
agreements.

Lending portfolio securities.

The Portfolio may lend its portfolio securities to member firms of the New
York Stock Exchange and commercial banks with assets of one billion dollars or
more. Any such loans must be secured continuously in the form of cash or cash
equivalents such as U.S. Treasury bills; the amount of the collateral must on
a current basis equal or exceed the market value of the loaned securities, and
the Portfolio must be able to terminate such loans upon notice at any time.
The Portfolio will exercise its right to terminate a securities loan in order
to preserve its right to vote upon matters of importance affecting holders of
the securities.

The advantage of such loans is that the Portfolio continues to receive the
equivalent of the interest earned or dividends paid by the issuers on the
loaned securities while at the same time earning interest on the cash or
equivalent collateral.

Securities  loans  are  usually  made  to  broker-dealers  and  other  financial
institutions  to  facilitate  their  delivery  of such  securities.  As with any
extension of credit,  there may be risks of delay in recovery and possibly  loss
of  rights  in  the  loaned   securities  should  the  borrower  of  the  loaned
securities  fail  financially.  However,  the  Portfolio  will make loans of its
portfolio  securities  only to those  firms  the  Advisor  or  Subadvisor  deems
creditworthy  and only on such terms the Advisor or Subadvisor  believes  should
compensate  for such risk. On  termination of the loan the borrower is obligated
to return the securities to the  Portfolio.  The Portfolio will realize any gain
or loss in the  market  value of the  securities  during  the loan  period.  The
Portfolio may pay reasonable custodial fees in connection with the loan.

<PAGE>
 
                            INVESTMENT RESTRICTIONS

Fundamental Investment Restrictions
         The  Portfolio  has  adopted  the  following   fundamental   investment
restrictions  which,  cannot be changed without the approval of the holders of a
majority of the Portfolio's  outstanding  shares, that term is as defined in the
Investment Company Act of 1940, as amended ("1940 Act").

         The Portfolio may not:

         1.       With  respect  to 75% of its total  assets,  purchase
         securities  of any  issuer  (other  than  obligations  of,  or
         guaranteed by, the United States  Government,  its agencies or
         instrumentalities)  if,  as a  result,  more  than  5% of  the
         value of the  Portfolio's  total  assets  would be invested in
         securities of that issuer.
         2.       Concentrate  25% or more of the  value  of its  total
         assets in any one industry;  provided,  however, that there is
         no  limitation  with  respect to  investments  in  obligations
         issued or guaranteed  by the United  States  Government or its
         agencies and instrumentalities.
         3.       With  respect  to 75% of its total  assets,  purchase
         more  than 10% of the  outstanding  voting  securities  of any
         issuer.
         4.       Make loans  except that the  Portfolio  may engage in
         securities  lending  (provided  the  value  of the  securities
         loaned  from the  Portfolio  will not  exceed 33% of the value
         of its total  assets)  and  repurchase  transactions,  and may
         purchase money market instruments.
         5.       Underwrite the securities of other issuers.
         6.       Borrow  money,  except  from banks for  temporary  or
         emergency  purposes  and then  only in an amount up to 33 1/3%
         of the value of that  Portfolio's  total  assets.  In order to
         secure  any  permitted  borrowings  under  this  section,  the
         Portfolio may pledge, mortgage or hypothecate its assets.
         7.       Make  short  sales  of  securities  or  purchase  any
         securities on margin  except with respect to options,  futures
         contracts and options on futures contracts.
         8.    Invest in  commodities  or real estate,  although it may
              invest in  securities  which are  secured by real  estate
              and  securities  of  issuers  which  invest  or  deal  in
              commodities  or  real  estate,   and  provided  that  the
              Portfolio  may invest in  financial  futures  and options
              thereon.
         9.    Issue any senior securities.

Non-Fundamental Investment Restrictions
         The   Portfolio   has   adopted   the   following    operating   (i.e.,
non-fundamental)  investment  policies and restrictions  which may be changed by
the Board of Trustees without shareholder approval. The Portfolio may not:
         10.      Purchase the obligations of foreign issuers.
         11.      Purchase  illiquid  securities  if more  than 15% of the value
         of the Portfolio's net assets would be      invested       in      such
         securities.
         12.      Purchase   debt   securities    (other   than   money   market
instruments).
         13.      Purchase or retain securities  issued by investment  companies
except to the extent permitted by
                  the 1940 Act, and in connection  with the  trustees'  deferred
         compensation plan.
         14.      Enter  into a  futures  contract  or an  option  on a  futures
contract if the aggregate initial margins and
premiums   required  to  establish  these  positions  would  exceed  5%  of  the
Portfolio's net assets.

         Any  investment  restriction  (other than nos. 6 and 11) which involves
a maximum  percentage  of  securities  or assets shall not be  considered  to be
violated  unless an excess over the  applicable  percentage  occurs  immediately
after an  acquisition  of  securities  or  utilization  of  assets  and  results
therefrom.

                   INVESTMENT SELECTION AND SCREENING PROCESS

         Investments  in the  Portfolio  are  selected  on the  basis  of  their
ability to  contribute  to the dual  objective of the  Portfolio,  (i.e.,  those
that satisfy the Portfolio's  investment and social  criteria).  The Advisor and
Subadvisor   have   developed  a  number  of  techniques   for   evaluating  the
performance  of  issuers  in  each  of  these  areas.  The  primary  sources  of
information  are reports  published  by the issuers  themselves,  the reports of
public  agencies,  and the  reports  of  groups  which  monitor  performance  in
particular  areas.  These sources of  information  are sometimes  augmented with
direct  interviews  or  written  questionnaires  addressed  to the  issuers.  It
should be recognized,  however,  that there are few generally  accepted measures
by which  achievement  in these areas can be readily  distinguished;  therefore,
the  development  of  suitable  measurement  techniques  is  largely  within the
discretion and judgment of the Advisor and Subadvisor.

         Candidates  for  inclusion in any  particular  class of assets are then
examined  according to the social  criteria.  Issuers are classified  into three
categories of suitability  under the social criteria.  In the first category are
those issuers  which exhibit  unusual  positive  accomplishment  with respect to
some of the criteria and do not fail to meet minimum  standards  with respect to
the remaining criteria.  To the greatest extent possible,  investment selections
are made from this group.  In the second  category are those  issuers which meet
minimum  standards  with  respect  to  all  the  criteria  but  do  not  exhibit
outstanding   accomplishment  with  respect  to  any  criterion.  This  category
includes  issuers  which may lack an  affirmative  record of  accomplishment  in
these  areas but which are not known by  Advisor  to  violate  any of the social
criteria.  The third  category  under the social  criteria  consists  of issuers
which flagrantly  violate,  or have violated,  one or more of those values,  for
example,  a company  which  repeatedly  engages in unfair labor  practices.  The
Portfolio  will not knowingly  purchase the  securities of issuers in this third
category.
         It should be noted that the  Portfolio's  social criteria tend to limit
the availability of investment  opportunities  more than is customary with other
investment companies. The Advisor,  however,  believes that within the first and
second categories there are sufficient  investment  opportunities to permit full
investment among issuers which satisfy the Portfolio's social criteria.

                              DIVIDENDS AND TAXES

         It is the policy of the  Portfolio  to declare and pay  dividends  from
net  investment  income on an annual  basis.  Dividends  and  distributions  may
differ among the classes.  Distributions  of realized net capital gains, if any,
are normally paid once a year;  however,  the Portfolio  does not intend to make
any such  distributions  unless available capital loss carryovers,  if any, have
been used or have expired.
         The  Portfolio  is  required  to  withhold  31%  of any  dividends  and
capital gain distributions  paid and 31% of each redemption  transaction if: (a)
the  shareholder's  social  security  number  or other  taxpayer  identification
number  ("TIN") is not provided or an obviously  incorrect TIN is provided;  (b)
the  shareholder  does not  certify  under  penalties  of  perjury  that the TIN
provided  is the  shareholder's  correct  TIN and  that the  shareholder  is not
subject  to backup  withholding  under  section  3406(a)(1)(C)  of the  Internal
Revenue Code of 1986 as amended  ("Code")  because of  underreporting  (however,
failure   to   provide   certification   as  to  the   application   of  section
3406(a)(1)(C)  will  result  only in backup  withholding  on  dividends,  not on
redemptions);  or (c) the Portfolio is notified by the Internal  Revenue Service
that the TIN  provided by the  shareholder  is  incorrect or that there has been
underreporting   of  interest  or   dividends  by  the   shareholder.   Affected
shareholders  will receive  statements at least  annually  specifying the amount
withheld.
         In  addition,  the  Portfolio  is  required  to report to the  Internal
Revenue  Service  the  following  information  with  respect to each  redemption
transaction occurring:  (a) the shareholder's name, address,  account number and
taxpayer  identification  number; (b) the total dollar value of the redemptions;
and (c) the Portfolio's identifying CUSIP number.
         Certain  shareholders are, however,  exempt from the backup withholding
and broker reporting  requirements.  Exempt shareholders include:  corporations;
financial institutions;  tax-exempt organizations;  individual retirement plans;
the U.S.,  a State,  the  District of  Columbia,  a U.S.  possession,  a foreign
government,  an  international  organization,   or  any  political  subdivision,
agency or instrumentality of any of the foregoing;  U.S. registered  commodities
or securities  dealers;  real estate investment  trusts;  registered  investment
companies;  bank common trust funds; certain charitable trusts;  foreign central
banks of issue.  Non-resident  aliens,  certain foreign partnerships and foreign
corporations  are  generally not subject to either  requirement  but may instead
be  subject  to   withholding   under   sections  1441  or  1442  of  the  Code.
Shareholders  claiming  exemption from backup  withholding and broker  reporting
should call or write the Portfolio for further information.
         Dividends  paid by the  Portfolio  may be  eligible  for the  dividends
received  deduction  available to corporate  taxpayers.  Information  concerning
the tax  status of  dividends  and  distributions  and the  amount of  dividends
withheld, if any, is mailed annually to shareholders.
         Investors  should  note  that  they  may be  required  to  exclude  the
initial  sales  charge,  if any, paid on the purchase of Class A shares from the
tax basis of those  shares if the  shares  are  exchanged  for shares of another
Calvert  Group Fund within 90 days of purchase.  This  requirement  applies only
to the extent  that the  payment  of the  original  sales  charge on the Class A
shares  of the  Portfolio  causes a  reduction  in the  sales  charge  otherwise
payable on the shares of the Calvert Group Fund  acquired in the  exchange,  and
investors  may treat  sales  charges  excluded  from the  basis of the  original
shares as incurred to acquire the new shares.

                                NET ASSET VALUE

         The  public  offering  price  of the  shares  of the  Portfolio  is the
respective net asset value per share (plus,  for Class A shares,  the applicable
sales  charge).  Shares are  redeemed at their  respective  net asset values per
share, less any applicable  contingent  deferred sales charge ("CDSC").  The net
asset value of the Portfolio  fluctuates  based on the  respective  market value
of the Portfolio's  investments.  The net asset value per share of the Portfolio
is  determined  every  business day at the close of the New York Stock  Exchange
(normally  4:00 p.m.  Eastern  time) and at such other times as may be necessary
or  appropriate.  The  Portfolio  does not  determine net asset value on certain
national  holidays  or  other  days on  which  the New York  Stock  Exchange  is
closed:  New Year's Day,  Martin  Luther King,  Jr. Day,  Presidents'  Day, Good
Friday,  Memorial  Day,  Independence  Day,  Labor Day,  Thanksgiving  Day,  and
Christmas  Day.  Net asset value per share is  determined  per class by dividing
its total net assets  (the value of its  assets  net of  liabilities,  including
accrued expenses and fees) by the number of shares outstanding for that class.
         The assets of the Portfolio are valued as follows:  (a)  securities for
which  market  quotations  are readily  available  are valued at the most recent
closing  price,  mean  between  bid and  asked  price,  or yield  equivalent  as
obtained  from one or more market  makers for such  securities;  (b)  securities
maturing  within  60 days may be valued  at cost,  plus or minus  any  amortized
discount or premium,  unless the Board of  Trustees  determines  such method not
to be  appropriate  under the  circumstances;  and (c) all other  securities and
assets for which market  quotations are not readily  available will be valued at
their  fair  value  as  determined  by the  Advisor  in  good  faith  under  the
supervision of the Board of Trustees.

                          CALCULATION OF TOTAL RETURN

         The   Portfolio  may  advertise   "total   return."   Total  return  is
calculated  separately  for each  class.  It is  computed  by  taking  the total
number of shares purchased by a hypothetical  $1,000  investment after deducting
any applicable sales charge,  adding all additional  shares purchased within the
period with  reinvested  dividends and  distributions,  calculating the value of
those  shares at the end of the period,  and  dividing the result by the initial
$1,000  investment.  For  periods of more than one year,  the  cumulative  total
return  is then  adjusted  for the  number  of years,  taking  compounding  into
account, to calculate average annual total return during that period.
         Total return is computed according to the following formula:

                                P(1 + T)n = ERV

where P = a  hypothetical  initial  payment of  $1,000;  T = total  return;  n =
number  of  years;  and ERV = the  ending  redeemable  value  of a  hypothetical
$1,000 payment made at the beginning of the period.
         Total  return is  historical  in nature and is not intended to indicate
future  performance.  All total return  quotations  reflect the deduction of the
Portfolio's  maximum sales charge,  except quotations of "return without maximum
load"  (or "w/o max  load")  which  do not  deduct  sales  charge,  and  "actual
return,"  which  reflect  deduction of the sales  charge only for those  periods
when a sales charge was actually  imposed.  Return without  maximum load,  which
will be higher than total return,  should be considered only by investors,  such
as  participants  in certain  pension  plans,  to whom the sales charge does not
apply,  or for purposes of comparison  only with  comparable  figures which also
do not reflect sales charges, such as Lipper averages.

         Total return,  like yield and net asset value per share,  fluctuates in
response to changes in market  conditions.  Neither  total  return nor yield for
any particular time period should be considered an indication of future return.

                       PURCHASE AND REDEMPTION OF SHARES

         Share  certificates  will not be issued unless  requested in writing by
the  investor.  No  charge  will be made  for  share  certificate  requests.  No
certificates  will be issued for fractional  shares.  A service fee of $10, plus
any costs incurred by the Portfolio,  will be charged  investors  whose purchase
checks are returned for insufficient funds.
         Telephone  redemption  requests are processed upon the date of receipt,
if received prior to 4:00 p.m.  Eastern Time.  Redemption  proceeds are normally
transmitted  or mailed  the next  business  day,  although  payment  by check of
redemption  proceeds  may take up to five  business  days.  Certain  Class B and
Class C shares may be subject to a  contingent  deferred  sales  charge which is
subtracted  from  the  redemption  proceeds  (see  Prospectus,  "Calculation  of
Contingent  Deferred  Sales  Charges  and Waiver of Sales  Charges").  Telephone
redemption  requests which would require the  redemption of shares  purchased by
check or  electronic  funds  transfer  within the previous 10 business  days may
not be  honored.  The  Portfolio  reserves  the  right to modify  the  telephone
redemption privilege.
         Amounts  redeemed by  telephone  may be mailed by check to the investor
to the  address  of record  without  charge.  Amounts  of more than $50 and less
than $300,000 may be  transferred  electronically  at no charge to the investor.
Amounts  of $l,000 or more will be  transmitted  by wire  without  charge by the
Portfolio to the investor's  account at a domestic bank or savings  association.
A charge of $5 is imposed on wire transfers of less than $1,000.
         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  Portfolio  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.  Further  documentation may
be required from  corporations,  fiduciaries,  pension plans, and  institutional
investors.
         The  Portfolio's  redemption  check  normally  will  be  mailed  to the
investor  on the  next  business  day  following  the  date  of  receipt  by the
Portfolio  of a written  redemption  request.  If the  investor so  instructs in
such  written  redemption  request,  the check will be mailed or the  redemption
proceeds wired or transferred  electronically to a preauthorized  account at the
investor's  bank.  Redemption  proceeds are normally paid in cash.  However,  at
the sole  discretion  of the  Portfolio,  the  Portfolio has the right to redeem
shares in  assets  other  than cash for  redemption  amounts  exceeding,  in any
90-day  period,  $250,000  or 1% of  the  net  asset  value  of  the  Portfolio,
whichever is less, or as allowed by law.
         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  Securities and Exchange  Commission,  or if the Commission has ordered such
a  suspension  for the  protection  of  shareholders.  Redemption  proceeds  are
normally mailed,  wired or transferred  electronically the next business day but
in no event  later than seven days after a proper  redemption  request  has been
received,  unless  redemptions  have been  suspended  or  postponed as described
above.

                        REDUCED SALES CHARGES (CLASS A)

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

                                  ADVERTISING

         The Fund or its  affiliates  may provide  information  such as, but not
limited   to,  the   economy,   investment   climate,   investment   principles,
sociological   conditions  and  political   ambiance.   Discussion  may  include
hypothetical  scenarios  or  lists  of  relevant  factors  designed  to aid  the
investor  in   determining   whether  the  Portfolio  is  compatible   with  the
investor's goals. The Portfolio may list portfolio  holdings or give examples or
securities  that  may have  been  considered  for  inclusion  in the  Portfolio,
whether held or not.
         The Fund or its  affiliates  may supply  comparative  performance  data
and rankings  from  independent  sources such as  Donoghue's  Money Fund Report,
Bank  Rate  Monitor,  Money,  Forbes,  Lipper  Analytical  Services,  Inc.,  CDA
Investment  Technologies,   Inc.,  Wiesenberger  Investment  Companies  Service,
Russell  1000  Index,  Mutual  Fund  Values  Morningstar  Ratings,  Mutual  Fund
Forecaster,  Barron's,  The  Wall  Street  Journal,  and  Schabacker  Investment
Management,  Inc. Such averages  generally do not reflect any front- or back-end
sales charges that may be charged by Funds in that  grouping.  The Portfolio may
also cite to any source,  whether in print or  on-line,  such as  Bloomberg,  in
order to acknowledge  origin of information.  The Fund may compare itself or its
portfolio holdings to other  investments,  whether or not issued or regulated by
the  securities  industry,  including,  but  not  limited  to,  certificates  of
deposit and Treasury  notes.  The  Portfolio,  its Advisor,  and its  affiliates
reserve  the  right  to  update  performance  rankings  as new  rankings  become
available.
         Calvert Group is the nation's  leading  family of socially  responsible
mutual  funds,  both in terms of socially  responsible  mutual fund assets under
management,  and number of socially  responsible  mutual fund portfolios offered
(source:  Social  Investment Forum,  December 31, 1996).  Calvert Group was also
the first to offer a family of socially responsible mutual fund portfolios.

                    TRUSTEES, OFFICERS, AND ADVISORY COUNCIL

         REBECCA  ADAMSON,  Trustee.  Since  1983,  Ms.  Adamson  has  served as
President of the national non-profit,  First Nations Financial Project.  Founded
by  her  in  1980,  First  Nations  is  the  only  American  Indian  alternative
development  institute in the country.  DOB: 9/10/47.  Address:  69 Kelley Road,
Falmouth, Virginia 22405.
         RICHARD L. BAIRD, JR.,  Trustee.  Mr. Baird is Executive Vice President
of the Family  Health  Council,  Inc. in  Pittsburgh,  Pennsylvania.  The Family
Health  Council is a  non-profit  corporation  which  provides  family  planning
services,  nutrition,  maternal/child  health care, and various health screening
services.  Mr. Baird is a trustee/director  of each of the investment  companies
in the Calvert Group of Funds,  except for Calvert New World Fund, Inc.,  Acacia
Capital Corporation,  and Calvert World Values Fund, Inc. DOB: 5/9/48.  Address:
211 Overlook Drive, Pittsburgh, Pennsylvania 15216.
         *JOHN G.  GUFFEY,  JR.,  Executive  Vice  President  and  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  Calvert  New World Fund,  Inc.  and Acacia  Capital
Corporation.  DOB: 5/15/48.  Address:  7205 Pomander Lane, Chevy Chase, Maryland
20815.
         JOY  V.  JONES,   Esq.,   Trustee.   Ms.   Jones  is  an  attorney  and
entertainment  manager in New York  City,  and was  formerly a partner  with the
firm  Rogers & Wells in New  York  City,  specializing  in real  estate  law and
municipal  finance.  Ms. Jones is also Chairman of the Board of Ultrafem, Inc.,
a Trustee of Sarah  Lawrence  College,  a member of the Association of Black 
Women  Attorneys,  Inc., and a Trustee of the Community  Service  Society of 
New York.  DOB:  7/2/50.  Address:  175 West 12th Street, New York,
 New York 10011.

         *BARBARA J. KRUMSIEK,  President and Director.  Ms.  Krumsiek serves as
President,  Chief  Executive  Officer and Vice Chairman of Calvert  Group,  Ltd.
and as an officer and  director of each of its  affiliated  companies.  She is a
director of Calvert-Sloan  Advisers,  L.L.C., co-chair of the Board of Directors
of Calvert  World  Values  Fund,  Inc.,  and a  trustee/director  of each of the
investment  companies in the Calvert  Group of Funds.  Prior to joining  Calvert
Group,  Ms.  Krumsiek  served as Senior Vice President of Alliance  Capital LP's
Mutual Fund Division. DOB: 08/09/52.
         TERRENCE  J.  MOLLNER,  Ed.D.,  Trustee.  Dr.  Mollner is  Founder  and
Chairperson  of  Trusteeship   Institute,   Inc.,  a  diverse  foundation  known
principally  for its  consultation  to  corporations  converting to  cooperative
employee-ownership.  He is also a director of Calvert  World Values  Fund,  Inc.
He served as a Trustee of the  Cooperative  Fund of New  England,  Inc.,  and is
now a member of its Board of  Advisors.  In addition,  Dr.  Mollner is a founder
and  member of the  Board of  Trustees  of the  Foundation  for  Soviet-American
Economic Cooperation.  DOB: 12/13/44.  Address: 15 Edwards Square,  Northampton,
Massachusetts 01060.
         SYDNEY AMARA MORRIS,  Trustee.  Rev.  Morris is Senior  Minister of the
Unitarian  Church of Vancouver,  Canada.  She  previously  served as Minister of
the  Unitarian-Universalist  Fellowship in Ames, Iowa. Rev. Morris is a graduate
of the Harvard  Divinity  School.  DOB:  9/7/49.  Address:  1225 W. 26th Avenue,
Vancouver, British Columbia, Canada V6H2A8.
         *CHARLES T. NASON,  Trustee.  Mr. Nason  serves as Chairman,  President
and Chief  Executive  Officer  of The Acacia  Group,  a  Washington,  D.C.-based
financial  services   organization,   including  Acacia  Mutual  Life  Insurance
Company and Calvert Group,  Ltd. DOB: 4/22/46.  Address:  7315 Wisconsin Avenue,
Bethesda, Maryland 20814.
         *D.  WAYNE  SILBY,  Esq.,   President  and  Trustee.  Mr.  Silby  is  a
trustee/director  of each of the  investment  companies in the Calvert  Group of
Funds,  except for Calvert New World Fund, Inc. and Acacia Capital  Corporation.
Mr. Silby is the Chief Executive Officer of Group Serve, a software company, and
an officer,  director and  shareholder of Silby,  Guffey & Company, Inc., 
 which  serves as  general  partner  of Calvert  Social  Venture  Partners
("CSVP").  CSVP is a venture  capital  firm  investing  in socially  responsible
small companies.  DOB: 7/20/48.  Address:  1715 18th Street,  N.W.,  Washington,
D.C. 20009.
         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 Assistant  Secretary.
Mr.  Tartikoff is an officer of each of the investment  companies in the Calvert
Group of Funds,  and is Senior Vice  President,  Secretary,  and General Counsel
of Calvert Group,  Ltd.,  and each of its  subsidiaries.  Mr.  Tartikoff is also
Vice President and Secretary of  Calvert-Sloan  Advisers,  L.L.C., a director of
Calvert  Distributors,   Inc.,  and  is  an  officer  of  Acacia  National  Life
Insurance Company. DOB: 8/12/47.
         CATHERINE S. BARDSLEY,  Esq., Secretary.  Ms. Bardsley is of counsel to
Kirkpatrick & Lockhart,  LLP, the Fund's legal counsel.  DOB: 10/4/49.  Address:
1800 Massachusetts Avenue, N.W., Washington, D.C. 20036.
         DANIEL  K.  HAYES,  Vice  President.  Mr.  Hayes is Vice  President  of
Calvert Asset Management  Company,  Inc., and is an officer of each of the other
investment  companies  in the  Calvert  Group of Funds,  except for  Calvert New
World Fund, Inc. DOB: 9/9/50.
         SUSAN  WALKER  BENDER,  Esq.,   Assistant  Secretary.   Ms.  Bender  is
Associate  General  Counsel  of  Calvert  Group,  and an  officer of each of its
subsidiaries and Calvert-Sloan  Advisers,  L.L.C. She is also an officer of each
of the other investment companies in the Calvert Group of Funds. DOB: 1/29/59.
         KATHERINE STONER, Esq.,  Assistant  Secretary.  Ms. Stoner is Associate
General  Counsel  of Calvert  Group and an  officer of each of its  subsidiaries
and Calvert-Sloan  Advisers,  L.L.C. She is also an officer of each of the other
investment companies in the Calvert Group of Funds. DOB: 10/21/56.
         LISA  CROSSLEY  NEWTON,   Esq.,   Assistant  Secretary  and  Compliance
Officer.  Ms. Crossley Newton is Associate  General Counsel of Calvert Group and
an officer of each of its subsidiaries and  Calvert-Sloan  Advisers,  L.L.C. She
is also an  officer of each of the other  investment  companies  in the  Calvert
Group of Funds. DOB: 12/31/61.
         IVY WAFFORD  DUKE,  Esq.,  Assistant  Secretary.  Ms. Duke is Assistant
Counsel  of  Calvert  Group  and an  officer  of  each of its  subsidiaries  and
Calvert-Sloan  Advisers,  L.L.C.  She is also an  officer  of each of the  other
investment companies in the Calvert Group of Funds. DOB: 9/7/68.

         The address of directors  and  officers,  unless  otherwise  noted,  is
4550 Montgomery  Avenue,  Suite 1000N,  Bethesda,  Maryland 20814.  Trustees and
officers  of  the  Fund  as  a  group  own  less  than  1%  of  the  Portfolio's
outstanding shares.  Trustees marked with an *, above, are "interested  persons"
of the Fund, under the Investment Company Act of 1940.
         Mr. Baird and Ms.  Adamson serve as the Fund's  representatives  to the
respective  Audit  Committees of the other  investment  companies in the Calvert
Group of  Funds;  and Rev.  Morris,  Dr.  Mollner,  and Ms.  Jones  serve as the
Portfolio's  representatives  to the respective  Investment Policy Committees of
the other investment companies in the Calvert Group of Funds.
         The Advisory  Council has no power,  authority or  responsibility  with
respect to the  management  of the  Portfolio  or the  conduct of the affairs of
the Portfolio.  Messrs.  Silby,  Guffey,  Mollner and Baird,  Ms.  Adamson,  Ms.
Jones,  Rev.  Morris,  and Ms.  Krumsiek and Mr. Bynum of the Advisory  Council,
serve as  directors  of  Calvert  Social  Investment  Foundation,  a  non-profit
organization  formed to increase  awareness and educate the general public about
the benefits of socially  conscious  investing.  The  Foundation is not directly
affiliated with Calvert Group.
         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  Portfolios  based upon their  relative  net assets.  Trustees who do
not  serve on the Board of other  Funds  sponsored  by the  Advisor  receive  an
annual fee of $15,430, plus $600 for each Board and Committee meeting attended.
         Trustees of the Fund not affiliated  with the  Portfolio's  Advisor may
elect to defer  receipt of all or a percentage  of their fees and invest them in
any  fund  in  the  Calvert  Family  of  Funds  through  the  Trustees  Deferred
Compensation  Plan.  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  Portfolio'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 1997         Aggregate
(unaudited numbers)      Compensation     Pension or Retirement   Total Comp.
                         from Registrant  Benefits Accrued        from
                         for Service      as part of              Registrant
                         as Trustee       Registrant Expenses*    and Fund
                                                                  Complex
                                                                  paid
                                                                  to Trustee**
 
 
 
Name of Trustee

Rebecca Adamson          $22,430        $6,198                   $24,230
Richard L. Baird, Jr.    $918           $0                       $34,450
John G. Guffey, Jr.      $11,781        $0                       $61,615
Joy V. Jones             $30,932        $0                       $29,730
Terrence J. Mollner      $31,910        $0                       $44,131
Sydney Amara Morris      $22,532        $0                       $22,630
D. Wayne Silby           $21,277        $0                       $62,830

*Ms. Adamson has chosen to defer a portion of her compensation. Her total
deferred compensation, including dividends and capital appreciation, was
$44,000.00 as of February 1, 1998. Rev. Morris also chose to defer a portion
of her compensation. Her total deferred compensation, including dividends and
capital appreciation, was $1,000.00 as of February 1, 1998. [Estimates]
**As of December 31, 1997. The Fund Complex consists of nine (9) registered
investment companies.

                               INVESTMENT ADVISOR

         The  Portfolio's   Investment   Advisor  is  Calvert  Asset  Management
Company,  Inc.,  4550  Montgomery  Avenue,  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 was entered
into  February 24, 1998 for the  Portfolio.  The contract  will remain in effect
indefinitely,  provided  continuance  is approved at least  annually by the vote
of the  holders of a majority  of the  outstanding  shares of the Fund or by the
Board of Trustees of the Fund;  and further  provided that such  continuance  is
also  approved  annually by the vote of a majority  of the  trustees of the Fund
who are not  parties to the  Contract  or  interested  persons of parties to the
Contract  or  interested  persons of such  parties,  cast in person at a meeting
called  for  the  purpose  of  voting  on such  approval.  The  Contract  may be
terminated  without  penalty by either party upon 60 days' prior written notice;
it automatically terminates in the event of its assignment.
         Under the  Contract,  the  Advisor  provides  investment  advice to the
Portfolio  and  oversees its  day-to-day  operations,  subject to direction  and
control  by the  Fund's  Board  of  Trustees.  For  its  services,  the  Advisor
receives an annual  fee,  payable  monthly,  of 0.60% of the  Portfolio's  first
$500  million of average  daily net  assets,  and 0.55% of any such  assets over
$500  million.  The  Advisor  reserves  the  right (i) to waive all or a part of
its fee and/or  reimburse  the  Portfolio  for expenses  and (ii) to  compensate
broker-dealers   in  consideration  of  their   promotional  or   administrative
services.
     The Advisor may, but is not required by this  Agreement,  to waive  current
payment of its fees, or to reimburse  expenses of the Fund. Any fees the current
payment of which is waived by the Advisor and any expenses  paid on behalf of or
reimbursed to the  Portfolio by the Advisor  through  February 29, 2000,  may be
recaptured  by the Advisor  from the  Portfolio  during the two years  beginning
March 1, 2000, and ending  February 28, 2002.  Such recapture shall only be made
to the  extent  that it does not  result in the  Portfolio's  Class A  aggregate
expenses exceeding on an annual basis 2.00% of Class A average daily net assets,
and 3.25%, 3.25%, and 1.25%, respectively, for Class B, Class C and Class I. The
Advisor may voluntarily  make  additional fee waivers or expense  reimbursements
with  respect to the  Portfolio  from March 1, 2000  through  February 28, 2002,
("Additional Period");  provided, however, that (a) any fees the current payment
of  which is  waived  by the  Advisor  and any  expenses  paid on  behalf  of or
reimbursed to the Portfolio by the Advisor during the  Additional  Period may be
recaptured by the Advisor from the Portfolio  during the two years  beginning on
March 1, 2002 and ending  February 29, 2004 and (b) such recapture shall only be
made to the extent that it does not result in the Portfolio's  Class A aggregate
expenses exceeding on an annual basis 2.00% of Class A average daily net assets,
and 3.25%, 3.25% and 1.25%,
respectively, for Class B, Class C and Class I.
         CAMCO has retained  State Street Global  Advisors,  a division of State
Street Bank and Trust Company.  as Subadvisor for the Portfolio.  CAMCO, not the
Portfolio,   pays  the  Subadvisor.   The  Subadvisor's  fee  is  0.35%  of  the
Portfolio's  first  $100  million  of  average  net assets and 0.25% of any such
assets over $100 million, subject to a minimum annual fee of $150,000.
         The Fund has  received  an  exemptive  order to permit the Fund and the
Advisor  to  enter  into  and  materially   amend  the  Investment   Subadvisory
Agreement  without  shareholder  approval.  Within 90 days of the  hiring of any
Subadvisor  or  the  implementation  of  any  proposed  material  change  in the
Investment  Subadvisory  Agreement,  the Portfolio will furnish its shareholders
information  about the new Subadvisor or Investment  Subadvisory  Agreement that
would be  included  in a proxy  statement.  Such  information  will  include any
change in such  disclosure  caused by the  addition of a new  Subadvisor  or any
proposed  material  change  in  the  Investment  Subadvisory  Agreement  of  the
Portfolio.  The Portfolio  will meet this  condition by providing  shareholders,
within  90  days  of the  hiring  of the  Subadvisor  or  implementation  of any
material  change to the terms of an Investment  Subadvisory  Agreement,  with an
information statement to this effect.
         The  Advisor   provides  the  Fund  with  investment   supervision  and
management,  social  screening,  office  space,  furnishes  executive  and other
personnel to the Fund, and may pay Fund  advertising and  promotional  expenses.
The Fund  pays all  other  administrative  and  operating  expenses,  including:
custodial,  registrar,  dividend  disbursing and transfer  agency fees;  federal
and  state  securities   registration  fees;  salaries,  fees  and  expenses  of
trustees,  executive  officers and employees of the Fund,  and Advisory  Council
members,  who are not  "affiliated  persons" of the  Advisor or the  Subadvisors
within the meaning of the Investment  Company Act of 1940;  insurance  premiums;
trade  association  dues;  legal  and  audit  fees;  interest,  taxes  and other
business   fees;   expenses  of   printing   and   mailing   reports,   notices,
prospectuses,  and proxy material to shareholders;  annual shareholders' meeting
expenses;  and  brokerage  commissions  and  other  costs  associated  with  the
purchase and sale of portfolio securities.

                             METHOD OF DISTRIBUTION

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

                    TRANSFER AND SHAREHOLDER SERVICING AGENT

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

                             PORTFOLIO TRANSACTIONS

         Portfolio   transactions   are   undertaken   on  the  basis  of  their
desirability  from  an  investment  standpoint.  Investment  decisions  and  the
choice  of  brokers  and  dealers  are  made  by  the  Portfolio's  Advisor  and
Subadvisor under the direction and supervision of the Fund's Board of Trustees.
         Broker-dealers  who  execute  portfolio  transactions  on behalf of the
Portfolio  are selected on the basis of their  professional  capability  and the
value and quality of their  services.  The Advisor  and  Subadvisor  reserve the
right to place  orders for the  purchase or sale of  portfolio  securities  with
broker-dealers  who  have  sold  shares  of the  Portfolio  or who  provide  the
Portfolio  with  statistical,  research,  or  other  information  and  services.
Although any statistical  research or other  information  and services  provided
by  broker-dealers  may be useful to the Advisor and the Subadvisor,  the dollar
value of such  information  and  services is generally  indeterminable,  and its
availability  or receipt does not serve to  materially  reduce the  Advisor's or
Subadvisor's normal research activities or expenses.
         The Advisor and  Subadvisor  may also  execute  portfolio  transactions
with or through  broker-dealers who have sold shares of the Portfolio.  However,
such   sales  will  not  be  a   qualifying   or   disqualifying   factor  in  a
broker-dealer's  selection nor will the selection of any  broker-dealer be based
on  the  volume  of  Portfolio  shares  sold.  The  Advisor  or  Subadvisor  may
compensate,  at its  expense,  such  broker-dealers  in  consideration  of their
promotional and administrative services.
         Depending  upon  market  conditions,   portfolio  turnover,   generally
defined as the  lesser of annual  sales or  purchases  of  portfolio  securities
divided by the average  monthly value of the  Portfolio's  portfolio  securities
(excluding  from both the numerator and the  denominator  all  securities  whose
maturities or  expiration  dates as of the date of  acquisition  are one year or
less),  expressed as a percentage,  is under normal circumstances expected to be
between 100% and 150%.

                     INDEPENDENT ACCOUNTANTS AND CUSTODIANS

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

                              GENERAL INFORMATION

         The Fund was  approved as a  Massachusetts  business  trust on December
14, 1981.  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 also  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 Portfolio  offers four separate  classes of shares:  Class A, Class
B, Class C, and Class I. Each class  represents  interests in the same portfolio
of  investments  but,  as further  described  in the  prospectus,  each class is
subject to differing sales charges and expenses,  which  differences will result
in differing net asset values and  distributions.  Upon any  liquidation  of the
Portfolio,  shareholders  of each  class are  entitled  to share pro rata in the
net assets belonging to that series available for distribution.
         The  Portfolio  will send its  shareholders  confirmations  of purchase
and  redemption  transactions,  as well as periodic  transaction  statements and
unaudited   semi-annual   and  audited  annual   financial   statements  of  the
Portfolio's investment securities, assets and liabilities,  income and expenses,
and changes in net assets.
         The  Prospectus  and this  Statement of Additional  Information  do not
contain all the  information  in the  Portfolio's  registration  statement.  The
registration  statement is on file with the Securities  and Exchange  Commission
and is available to the public.


<PAGE>

                                LETTER OF INTENT

                                                                                
Date

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

Ladies and Gentlemen:

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

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

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

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

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

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

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

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

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

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

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

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


                                                                           
Dealer                                       Name of
Investor(s)


By                                                                          
     Authorized Signer                       Address


                                                                            
Date                                        Signature of
Investor(s)


                                                                            
Date                                        Signature of
Investor(s)

<PAGE>
PART C. OTHER INFORMATION


Item 24. Financial Statements and Exhibits

         (a) Financial statements - not applicable

         (b) Exhibits:

         1. Declaration of Trust (incorporated by reference to
         Registrant's Initial Registration Statement,
         November 30, 1981).

         2. By-Laws (incorporated by reference to Registrant's
         Pre-Effective Amendment No. 2, September 3,
         1982).

         4. Specimen Stock Certificate (incorporated by reference
         to Registrant's Pre-Effective Amendment No.
         12, December 21, 1987).

         5. Form of Advisory Contract and Subadvisory Contract with respect
         to Registrant's Managed Index Portfolio (herewith).

         6. Distribution Agreement, (herewith)

         7. Trustees' Deferred Compensation Agreement,
         (incorporated by reference to Registrant's
         Post-Effective Amendment No. 17, December 20,
         1991).

         8. Custodial Contract (incorporated by reference to
         Registrant's Pre-Effective Amendment No. 25,
         January 23, 1998).

         9. Transfer Agency Contract (incorporated by reference to
         Registrant's Post-Effective Amendment No. 11,
         August 25, 1987).

         9A  Form of Administrative Services Agreement with respect
         to Registrant's Managed Index Portfolio (herewith)

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

         14. Retirement Plans (incorporated by reference to
         Registrant's Post-Effective Amendment No. 5,
         December 23, 1985, and Registrant's Post-Effective
         Amendment No. 17, December 20, 1991).

         15. Rule 12b-1 Distribution Plan, Fee Schedule with respect
         to Managed Index Portfolio (herewith)

         16. Schedule for Computation of Performance
         Quotation (incorporated by reference to Registrant's
         Post-Effective Amendment No. 13, December 20, 1988).

         18. Multiple-class plan pursuant to Investment
         Company Act of 1940 Rule 18f-3 (herewith)

         Exhibits 3, 11, 12, 13, and 17 are omitted because they are
inapplicable.


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

Registrant is controlled by its Board of Trustees, which is a
common Board with five other registered investment companies, First
Variable Rate Fund, Calvert Tax-Free Reserves, Calvert Cash Reserves,
The Calvert Fund, and Calvert Municipal Fund, Inc. In addition, several
members of Registrant's Board of Trustees also serve on the Boards of
Calvert Variable Series, Inc., and Calvert World Values Fund, Inc. Each
of the Registrant's Trustees, other than Mr. Nason, serves as a director
of Calvert Social Investment Foundation, Inc. (the "Foundation"), an
independent, non-profit educational foundation, organized as a Maryland
corporation. The Registrant's Trustees as a group may, under certain
circumstances, control both the Registrant and the Foundation.


Item 26. Number of Holders of Securities

As of March 1, 1998, there were 0 holders of record of
Registrant's Managed Index Portfolio.

Item 27. Indemnification

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

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


Item 28. Business and Other Connections of Investment Adviser

                           Name of Company, Principal
Name                       Business and Address                   Capacity


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

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

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

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

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


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

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


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

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


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

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


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

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

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


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

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


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

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


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

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


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

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


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

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


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


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


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


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


Geoffrey Ashton            Calvert Asset Management               Officer
                           Company, Inc.
                           Investment Advisor
                           4550 Montgomery Avenue
                           Bethesda, Maryland 20814
                           ------------------
                           Calvert Distributors, Inc.             Officer
                           Broker-Dealer
                           4550 Montgomery Avenue
                           Bethesda, Maryland 20814
                           ------------------


Item 29. Principal Underwriters

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

         (b)      Positions of Underwriter's Officers and Directors

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

Barbara J. Krumsiek        Director and President         Senior Vice President
                                                          and Trustee

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

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

Karen Becker               Vice President, Operations     None

Steve Cohen                Vice President                 None

Geoffrey Ashton            Regional Vice President        None

Susan Walker Bender        Assistant Secretary            Assistant Secretary

Katherine Stoner           Assistant Secretary            Assistant Secretary

Lisa Crossley Newton       Assistant Secretary            Assistant Secretary
                           and Compliance Officer

Ivy Wafford Duke           Assistant Secretary            Assistant Secretary

         (c)      Inapplicable.


Item 30. Location of Accounts and Records

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


Item 31. Management Services

         Not Applicable


Item 32. Undertakings

         a)     Not Applicable

         b)     The Registrant undertakes to file a post-effective
                  amendment, using financial statements which need not
                  be certified, within four to six months from the effective
                  date of the Registrant's 1933 Act registration statement.

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


<PAGE>


                              
                                SIGNATURES


     Pursuant  to  the  requirements  of the  Securities  Act of  1933  and  the
Investment  Company Act of 1940, the  Registrant  certifies that it meets all of
the requirements for  effectiveness of this Registration  Statement  pursuant to
Rule  485 (b)  under  the  Securities  Act of  1933  and has  duly  caused  this
registration  statement to be signed on its behalf by the  undersigned,  thereto
duly authorized in the City of Bethesda,  and State of Maryland, on the 2 day of
March, 1998.

                                    CALVERT SOCIAL INVESTMENT FUND


                                    By:               **
                                    _________________________________
                                    Barbara J. Krumsiek
                                    Senior Vice President and Trustee
<PAGE>

 
                           SIGNATURES


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


Signature                           Title                     Date


__________**____________            President and             
D. Wayne Silby                      Trustee (Principal Executive Officer)

__________**____________            Executive Vice            
John G. Guffey, Jr.                 President and Trustee

__________**_____________           Senior Vice President     
Barbara J. Krumsiek                 and Trustee

________________________            Principal Accounting      
Ronald M. Wolfsheimer               Officer

__________**____________            Trustee                   
Rebecca L. Adamson

__________**____________            Trustee                  
Richard L. Baird, Jr.

_____________________               Trustee                  
Joy V. Jones

__________**____________            Trustee                   
Terrence J. Mollner

__________**____________            Trustee                   
Sydney Amara Morris

__________**____________            Trustee                   
Charles T. Nason


                                    **By:____________________________
                                    Name:   Susan Walker Bender
                                            as Attorney-in-fact
         
                                        Executed on March 1, 1998, 
                                        by Susan Walker Bender on behalf 
                                        of those indicated pursuant
                                        to a Power of Attorney, 
                                        filed here with.
<PAGE>

EXHIBIT INDEX

Form N-1A 
Item No.

Ex-99.1
24(b)(5)              Investment Advisory Agreement and Fee Schedule

Ex-99.2
24(b)(5)              Subadvisory Agreement with State Street Global Advisor

Ex-99.6               Distribution Agreement
24 (b)(6)

Ex-99.3
24(b)(9A)             Calvert Administrative Services Agreement

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

Ex-99.4
24(b)(15)             Rule 12b-1 Distribution Plan for Class A and 
24(b)(15)(a)            Class A Fee Schedule for the Managed Index Portfolio
24(b)(15)(b)          Rule 12b-1 Distribution Plan for Class B and Class C

Ex-99.5
24(b)(18)             Rule 18f-3 Plan



                            
Ex-24                 Power of Attorney

















 
Exhibit 10




March 3, 1998



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

         Re:      Exhibit 10, Form N-1A
                  Calvert Social Investment Fund
                  2-75106 and 811-3334

Ladies and Gentlemen:

         As counsel to Calvert Group, Ltd., it is my opinion that the
securities being registered by this Post-effective Amendment No. 26
will be legally issued, fully paid and non-assessable when sold.  My
opinion is based on an examination of documents related to Calvert
Social Investment Fund (the "Trust"), including its Declaration of
Trust, its By-laws, other original or Photostat copies of Trust
records, certificates of public officials, documents, papers,
statutes, and authorities as deemed necessary to form the basis of
this opinion.

         I, therefore consent to filing this opinion of counsel with
the Securities and Exchange Commission as an Exhibit to the Trust's
Post-Effective Amendment No. 26 to its Registration Statement.

Sincerely,


/s/ Susan Walker Bender

Susan Walker Bender
Associate General Counsel



                               POWER OF ATTORNEY


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

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

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

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

         WITNESS my hand on the date set forth below.


December 2, 1997
Date                                        /Signature/

Cathy Mulligan                              Barbara Krumsiek
Witness                                     Name of Trustee/Director


<PAGE>


                               POWER OF ATTORNEY


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

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

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

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

         WITNESS my hand on the date set forth below.

December 6, 1997
Date                                        /Signature/

Ida Maupin Findlay                          Rebecca L. Adamson
Witness                                     Name of Trustee/Director


<PAGE>

                               POWER OF ATTORNEY


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

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

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

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

         WITNESS my hand on the date set forth below.

May 7, 1997
Date                                        /Signature/

Charles T. Nason                            Richard L. Baird, Jr.
Witness                                     Name of Trustee/Director

<PAGE>

                               POWER OF ATTORNEY


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

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

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

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

         WITNESS my hand on the date set forth below.

May 7, 1997
Date                                        /Signature/

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


<PAGE>
                               POWER OF ATTORNEY


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

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

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

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

         WITNESS my hand on the date set forth below.

November 29, 1997
Date                                        /Signature/

Marybeth Home                               Terrence J. Mollner
Witness                                     Name of Trustee/Director


<PAGE>

                               POWER OF ATTORNEY


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

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

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

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

         WITNESS my hand on the date set forth below.

May 7, 1997
Date                                        /Signature/

Edwidge Saint Felix                         Sydney Amara Morris
Witness                                     Name of Trustee/Director


<PAGE>

                               POWER OF ATTORNEY


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

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

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

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

         WITNESS my hand on the date set forth below.

December 2, 1997
Date                                        /Signature/

Freda S. Amar                               Charles T. Nason
Witness                                     Name of Trustee/Director

<PAGE>

                               POWER OF ATTORNEY


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

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

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

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

         WITNESS my hand on the date set forth below.

December 8, 1997
Date                                        /Signature/

Katherine Stoner                            D. Wayne Silby
Witness                                     Name of Trustee/Director


<PAGE>

                               POWER OF ATTORNEY


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

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

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

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

         WITNESS my hand on the date set forth below.

December 16, 1997
Date                                        /Signature/

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




             

                         INVESTMENT ADVISORY AGREEMENT

         INVESTMENT ADVISORY AGREEMENT, made this 24 day of February 1998, by
and between CALVERT ASSET MANAGEMENT COMPANY, INC., a Delaware corporation
having its principal place of business in Bethesda, Maryland (the "Advisor"),
and CALVERT SOCIAL INVESTMENT FUND, a Massachusetts business trust created
pursuant to a Declaration of Trust filed with the Secretary of State of the
Commonwealth of Massachusetts (the "Trust").

         WHEREAS, the Trust is registered as an open-end investment company
under the Investment Company Act of 1940, as amended (the "1940 Act"), for the
purpose of investing and reinvesting its assets in securities, as set forth in
its Declaration of Trust, its By-laws and its registration statements under
the 1940 Act and the Securities Act of 1933 as amended (the "1933 Act"), the
Trust has registered separate series of shares of beneficial interest for sale
to the public; and the Trust desires to avail itself of the services,
information, advice, assistance and facilities of an investment advisor and to
have an investment advisor perform for it various investment advisory and
research services, and other management services; and

         WHEREAS, the Advisor is an investment advisor registered under the
Investment Advisers Act of 1940, as amended, and is engaged in the business of
rendering management and investment advisory services to investment companies
and desires to provide such services to the Trust;

         NOW, THEREFORE in consideration of the terms and conditions
hereinafter set forth, it is agreed as follows:

         1.       Employment of the Advisor.  The Trust hereby employs the
Advisor to manage the investment and reinvestment of the assets of those
separate series of the Trust specified in one or more Schedules attached
hereto and made a part of this Agreement (each a "Fund"), subject to the
control and direction of the Trust's Board of Trustees, for the period and on
the terms hereinafter set forth.  The Advisor hereby accepts such employment
and agrees during such period to render the services and to assume the
obligations herein set forth for the compensation herein provided.  The
Advisor shall for all purposes herein be deemed to be an independent
contractor and shall, except as expressly provided or authorized (whether
herein or otherwise), have no authority to act for or represent the Trust in
any way or otherwise be deemed an agent of the Trust.

         2.       Obligations of and Services to be Provided by the Advisor.
The Advisor undertakes to provide the following services and to assume the
following obligations:

                  a.      The Advisor shall manage the investment and
                          reinvestment of each Fund's assets, subject to and
                          in accordance with the investment objectives and
                          policies of the Fund, and the social investment
                          criteria, as stated in the then current prospectus
                          and statement of additional information for the Fund
                          and any directions which the Trust's Board of
                          Trustees may issue from time to time.  In pursuance
                          of the foregoing, the Advisor shall make all
                          determinations with respect to the investment of
                          each Fund's assets and the purchase and sale of
                          portfolio securities and shall take such steps as
                          may be necessary to implement the same.  Such
                          determination and services shall also include
                          determining the manner in which voting rights,
                          rights to consent to corporate action, any other
                          rights pertaining to a Fund's portfolio securities
                          shall be exercised.  The Advisor shall render
                          regular reports to the Trust's Board of Trustees
                          concerning each Fund's investment activities.

                  b.      The Advisor shall, in the name of the Trust on
                          behalf of each Fund, place orders for the execution
                          of the Fund's portfolio transactions in accordance
                          with the policies with respect thereto set forth in
                          the Trust's registration statement under the 1940
                          Act and the 1933 Act, as applicable to the Fund as
                          such registration statement may be amended from time
                          to time.  In connection with the placement of orders
                          for the execution of each Fund's portfolio
                          transactions, the Advisor shall create and maintain
                          all necessary brokerage records of the Fund in
                          accordance with all applicable laws, rules and
                          regulations, including but not limited to records
                          required by Section 31(a) of the 1940 Act.  All
                          records shall be the property of the Trust and shall
                          be available for inspection and use by the
                          Securities and Exchange Commission (the "SEC"), the
                          Trust or any person retained by the Trust.  Where
                          applicable, such records shall be maintained by the
                          Advisor for the periods and the places required by
                          Rule 31a-2 under the 1940 Act.

                  c.      The Advisor shall bear its expenses of providing
                          services to the Trust and each Fund pursuant to this
                          Agreement except such expenses as are undertaken by
                          the Trust or the Fund.  In addition, the Advisor
                          shall pay the salaries and fees of all Trustees, and
                          executive officers who are employees of the Advisor
                          or its affiliates ("Advisor Employees").

                  d.   In providing the services and assuming the obligations
                      set forth herein, the Advisor may, at its expense,
                      employ one or more Subadvisors. References herein to the
                      Advisor shall include any Subadvisor employed by the
                      Advisor.  Any agreement between the Advisor and a
                      Subadvisor shall be subject to the Renewal, Termination
                      and Amendment provisions of paragraph 10 hereof.

                  e.   The Advisor is responsible for screening investments to
                      determine that they meet the Fund's social investment
                      criteria, as may be amended from time to time by the
                      Trustees.

         3.       Expenses of Each Fund.  Each Fund shall pay all expenses
other than those expressly assumed by the Advisor.  Expenses payable by the
Fund shall include, but are not limited to:

                   a.      Fees to the Advisor as provided herein:

                   b.      Legal and audit expenses;

                   c.      Fees and expenses related to the registration and
                           qualification of the Fund and its shares for
                           distribution under federal and state securities
                           laws;

                   d.      Expenses of the administrative service agent,
                           transfer agent, registrar, custodian, dividend
                           disbursing agent and shareholder servicing agent;

                   e.      Salaries, fees and expenses of Trustees and
                           executive officers of the Trust, other than Advisor
                           Employees;

                   f.      Taxes and corporate fees levied against the Fund;

                   g.      Brokerage commissions and other expenses associated
                           with the purchase and sale of portfolio securities
                           for the Fund;

                   h.      Expenses, including interest, of borrowing money;

                   i.      Expenses incidental to meetings of the Fund's
                           shareholders and the Fund's allocable portion of
                           the expenses incidental to the maintenance of the
                           Trust's organizational existence;

                   j.      Expenses of printing stock certificates
                           representing shares of the Fund and expenses of
                           preparing, printing and mailing notices, proxy
                           material, reports to regulatory bodies and reports
                           to shareholders of the Fund;

                   k.      Expenses of preparing and typesetting of
                           prospectuses of the Fund;

                   l.      Expenses of printing and distributing prospectuses
                           to shareholders of the Fund;

                   m.      The Fund's allocable portion of association
                           membership dues of the Trust;

                   n.      Insurance premiums for fidelity and other coverage;
                           and

                   o.      Distribution Plan expenses, as permitted by Rule
                           12b-1 under the 1940 Act and as authorized by the
                           Trustees.

         4.       Compensation of Advisor

                  a.       As compensation for the services rendered and
                           obligations assumed hereunder by the Advisor, the
                           Trust, on behalf of each Fund, shall pay to the
                           Advisor advisory fees as specified in one or more
                           Schedules attached hereto and made part of this
                           Agreement.  Such fees shall be payable within ten
                           (10) days after the last day of each calendar
                           month.  Upon termination of this Agreement before
                           the end of any calendar month, the fee for such
                           period shall be prorated in the manner set forth in
                           one or more attached Schedules.  The Schedules may
                           be amended from time to time, provided that
                           amendments thereto are made in conformity with
                           applicable  laws and regulations and the
                           Declaration of Trust and By-laws of the Trust.  Any
                           amendment to a Schedule pertaining to any new or
                           existing Fund shall not be deemed to affect the
                           interest of any other Fund and shall not require
                           the approval of the shareholders of any other Fund.

                  b.       The Advisor reserves the  right (i) to waive all or
                           part of its fee and assume expenses of the Fund
                           and (ii) to make payments to brokers and dealers in
                           consideration of their promotional or
                           administrative services.

         5.       Activities of the Advisor.  The services of the Advisor to
the Trust and each Fund hereunder are not to be deemed exclusive, and the
Advisor shall be free to render similar services to others.  It is understood
that Trustees and officers of the Trust are or may become interested in the
Advisor as stockholders, officers, or otherwise , and that stockholders and
officers of the Advisor are or may become similarly interested in the Trust,
and that the Advisor may become interested in the Trust as shareholder or
otherwise.

         6.       Use of Names.  The Trust or any Fund shall not use the name
of the Advisor in any prospectus, sales literature or other material relating
to the Trust in any manner not approved prior thereto by the Advisor;
provided, however, that the Advisor shall approve all uses of its name which
merely refer in accurate terms to its appointment hereunder or which are
required by the SEC or a State Securities Commission; and, provided, further,
that in no event shall such approval be unreasonably withheld.  The Advisor
shall not  use the name of the Trust or any Fund in any material relating to
the Advisor in any manner not approved prior thereto by the Trust; provided,
however, that the Trust shall approve all uses of its name which merely refer
in accurate terms to the appointment of the Advisor hereunder or which are
required by the SEC or a State Securities Commission; and, provide, further,
that in no event shall such approval be unreasonably withheld.

         The Trustees of the Trust acknowledge that, in consideration of the
Advisor's assumption of certain expenses of formation of the Trust, the
Advisor has reserved for itself the rights to the name "Calvert Social
Investment Fund" (or any similar name) and that use by the Trust of such name
shall continue only with the continuing consent of the Advisor, which consent
may be withdrawn at any time, effective immediately, upon written notice
thereof to the Trust.

         7.       Liability of the Advisor.  Absent willful misfeasance, bad
faith, gross negligence, or reckless disregard of obligations or duties
hereunder on the part of the Advisor, the Advisor shall not be subject to
liability to the Trust or to any shareholder of the Trust for any act or
omission in the course of, or connected with, rendering services hereunder or
for any losses that may be sustained in the purchase, holding or sale of any
security.

         8.       Limitation of Trust's Liability.  The Advisor acknowledges
that it has received notice of and accepts the limitations upon the Trust's
liability set forth in Article XI of its Declaration of Trust.  The Advisor
agrees that the Trust's obligations hereunder in any case shall be limited to
the Trust and to its assets and that the Advisor shall not seek satisfaction
of any such obligation from the shareholders of the Trust nor from any
Trustees, officer, employee or agent of the Trust.

         9.       Force Majeure.  The Advisor shall not be liable for delays
or errors occurring by reason of circumstances beyond its control, including
but not limited to acts of civil or military authority, national emergencies,
work stoppages, fire, flood, catastrophe, acts of God, insurrection, war,
riot, or failure of communication or power supply.  In the event of equipment
breakdowns beyond its control, the Advisor shall take reasonable steps to
minimize service interruptions but shall have no liability with respect
thereto.

         10.      Renewal, Termination and Amendment.  This Agreement shall
continue in effect with respect to each Fund, unless sooner terminated as
hereinafter provided for two years from the effective date as to that Fund,
and indefinitely thereafter if its continuance after such one year period
shall be specifically approved at least annually by vote of the holders of a
majority of the outstanding voting securities of the Fund or by vote of a
majority of the Trust's Board of Trustees; and further provided that such
continuance is also approved annually by the vote of a majority of the
Trustees who are not parties to this Agreement or interested persons of the
Advisor, cast in person at a meeting called for the purpose of voting on such
approval.  This Agreement may be terminated at any time with respect to a
Fund, without payment of any penalty, by the Trust's Board of Trustees or by
vote of the majority of the outstanding voting securities of the Fund upon 60
days' prior written notice to the Advisor and by the Advisor upon 60 days'
prior written notice to the Trust.  This Agreement may be amended with respect
to a Fund at any time by the parties, subject to approval by the Trust's Board
of Trustees and, if required by applicable SEC rules and regulations, a vote
of a majority of the Fund's outstanding voting securities.  This Agreement
shall terminate automatically in the event of its assignment.  The terms
"assignment", "interested person", and "vote of a majority of the outstanding
voting securities" shall have the meaning set forth for such terms in the 1940
Act.

         11.      Severability.  If any provision of this Agreement shall be
held or made invalid by a court decision, statute, rule or otherwise, the
remainder of this Agreement shall not be affected thereby.

         12.      Miscellaneous.  Each party agrees to perform such further
actions and execute such further documents as are necessary to effectuate the
purposes hereof.  This Agreement shall be construed and enforced in accordance
with and governed by the laws of the State of Maryland.  The captions in this
Agreement are included for convenience only and in no way define or delimit
any of the provisions hereof or otherwise affect their construction or effect.


         IN WITNESS WHEREOF, the parties have duly executed this Agreement as
of the date first written above.


                  CALVERT SOCIAL INVESTMENT FUND


                  By:                                      



                  CALVERT ASSET MANAGEMENT COMPANY, INC.


                  By:                                     


<PAGE>

                       Schedule dated February 24, 1998 to the
                            Investment Advisory Agreement
                                       between
                       Calvert Asset Management Company, Inc.
                                         and
                           Calvert Social Investment Fund

                               Managed Index Portfolio



     1.  Compensation.  As compensation  pursuant to Section 4 of the Investment
Advisory Agreement between Calvert Asset Management  Company,  Inc.  ("Advisor")
and Calvert  Social  Investment  Fund ("Trust")  dated  February 24, 1998,  with
respect to the above-referenced  Portfolio of the Trust ("Fund"), the Advisor is
entitled to receive from the Fund an advisory fee ("Fee").

     The annual Fee shall be computed daily and payable monthly, at an annual
rate of
0.60% of the first $500 million of average daily net assets of the Fund, and
0.55% of any such assets over $500 million.

     2.  Recapture of Waived Fees and Reimbursed  Expenses.  a. The Advisor may,
but is not required by this Agreement,  to waive current payment of its fees, or
to  reimburse  expenses of the Fund.  Any fees the  current  payment of which is
waived by the Advisor and any expenses  paid on behalf of or  reimbursed  to the
Portfolio by the Advisor  through  February 29, 2000,  may be  recaptured by the
Advisor from the Portfolio  during the two years  beginning  March 1, 2000,  and
ending  February 28, 2002.  Such recapture shall only be made to the extent that
it does not result in the Portfolio's Class A aggregate expenses exceeding on an
annual  basis 2.00% of Class A average  daily net assets,  and 3.25%,  3.25% and
1.25%, respectively for Class B, Class C and Class I.

     b. The  Advisor  may  voluntarily  make  additional  fee waivers or expense
reimbursements with respect to the Portfolio from March 1, 2000 through February
28,  2002,  ("Additional  Period");  provided,  however,  that  (a) any fees the
current  payment  of which is waived by the  Advisor  and any  expenses  paid on
behalf of or reimbursed to the  Portfolio by the Advisor  during the  Additional
Period may be recaptured by the Advisor from the Portfolio  during the two years
beginning  March 1, 2002 and ending  February  29,  2004 and (b) such  recapture
shall  only be made to the  extent  that it does not  result in the  Portfolio's
Class A aggregate expenses exceeding on an annual basis 2.00% of Class A average
daily net assets, and 3.25%, 3.25% and 1.25%,  respectively for Class B, Class C
and Class I.





 



 

                        INVESTMENT SUBADVISORY AGREEMENT

         INVESTMENT SUBADVISORY AGREEMENT, effective February 24, 1998, by and
between Calvert Asset Management Company, Inc., a Delaware corporation
registered as an investment Advisor under the Investment Advisors Act of 1940
(the "Advisor"), and State Street Bank and Trust Company, a Massachusetts
corporation (the "Subadvisor").

         WHEREAS, the Advisor is the investment advisor to the Calvert Social
Investment Fund (the "Trust"), an open-end, diversified management investment
company registered under the Investment Company Act of 1940, as amended (the
"1940 Act"); and

         WHEREAS, the Advisor desires to retain the Subadvisor to furnish it
with certain investment advisory services in connection with the Advisor's
investment advisory activities on behalf of the Trust and any series of the
Trust, for which Schedules are attached hereto (each such series referred to
individually as the "Fund").

         NOW, THEREFORE, in consideration of the terms and conditions
hereinafter set forth, it is hereby agreed as follows:

         1.       Services to be Rendered by the Subadvisor to the Fund.

                  (a)      Investment Program.  Subject to the control of the
         Trust's Board of Trustees and the Advisor, the Subadvisor at its
         expense continuously will furnish to the Fund an investment program
         for such portion, if any, of Fund assets designated by the Advisor
         from time to time.  With respect to such assets, the Subadvisor will
         make investment decisions, subject to Section 1(g) of this Agreement,
         and will place all orders for the purchase and sale of portfolio
         securities.  The Subadvisor is deemed to be an independent contractor
         and, except as expressly provided or authorized by this Agreement,
         has no authority to act for or represent the Trust or the Advisor in
         any way or otherwise be deemed an agent of the Trust or the Advisor.
         In the performance of its duties, the Subadvisor will act in the best
         interests of the Fund and will comply with (i) applicable laws and
         regulations, including, but not limited to, the 1940 Act and
         Subchapter M of the Internal Revenue Code of 1986, as amended, (ii)
         the terms of this Agreement, (iii) the Trust 's Declaration of Trust,
         Bylaws and Registration Statement as from time to time amended, (iv)
         relevant undertakings provided to State securities regulators, (v)
         the stated investment objective, policies and restrictions of the
         Fund, and (vi) such other guidelines as the Board of Trustees or
         Advisor may establish.  The Advisor is responsible for providing the
         Subadvisor with current copies of the materials specified in
         Subsections (a)(iii), (iv), (v) and (vi) of this Section 1.

                  (b)      Availability of Personnel.The Subadvisor at its
         expense will make available to the Trustees and Advisor at reasonable
         times its portfolio managers and other appropriate personnel, either
         in person or, at the mutual convenience of the Advisor and the
         Subadvisor, by telephone, in order to review the Fund's investment
         policies and to consult with the Trustees and Advisor regarding the
         Fund's investment affairs, including economic, statistical and
         investment matters relevant to the Subadvisor's duties hereunder, and
         will provide periodic reports to the Advisor relating to the
         investment strategies it employs.

                  (c)      Expenses, Salaries and Facilities.  The Subadvisor
         will pay all expenses incurred by it in connection with its
         activities under this Agreement (other than the cost of securities
         and other investments, including any brokerage commissions and all
         taxes, including any interest and penalties with respect thereto)
         including, but not limited to, all salaries of personnel and
         facilities required for it to execute its duties under this Agreement.

                  (d)      Compliance Reports.  The Subadvisor at its expense
         will provide the Advisor with such compliance reports relating to its
         duties under this Agreement as may be agreed on by such parties from
         time to time.

                  (e)      Valuation.  The Subadvisor will assist the Fund and
         its agents in determining whether prices obtained for valuation
         purposes accurately reflect market price information relating to the
         assets of the Fund for which the Subadvisor has responsibility on a
         daily basis (unless otherwise agreed on by the parties hereto) and at
         such other times as the Advisor shall reasonably request.

                  (f)      Executing Portfolio Transactions.

                           (i) Brokerage.  In selecting brokers and dealers to
                           execute purchases and sales of investments for the
                           Fund, the Subadvisor will use its best efforts to
                           obtain the most favorable price and execution
                           available in accordance with this paragraph.  The
                           Subadvisor agrees to provide the Advisor and the
                           Fund with copies of its policy with respect to
                           allocation of brokerage on trades for the Fund.
                           Subject to review by the Trustees of appropriate
                           policies and procedures, the Subadvisor may cause
                           the Fund to pay a broker a commission for effecting
                           a portfolio transaction, in excess of the
                           commission another broker would have charged for
                           effecting the same transaction.  If the first
                           broker provided brokerage and/or research services,
                           including statistical data, to the Subadvisor, the
                           Subadvisor shall not be deemed to have acted
                           unlawfully, or to have breached any duty created by
                           this Agreement, or otherwise, solely by reason of
                           acting according to such authorization.

                           (ii)      Aggregate Transactions.  In executing
                           portfolio transactions for the Fund, the Subadvisor
                           may, but will not be obligated to, aggregate the
                           securities to be sold or purchased with those of
                           its other clients where such aggregation is not
                           inconsistent with the policies of the Fund, to the
                           extent permitted by applicable laws and
                           regulations.  If the Subadvisor chooses to
                           aggregate sales or purchases, it will allocate the
                           securities as well as the expenses incurred in the
                           transaction in the manner it considers to be the
                           most equitable and consistent with its fiduciary
                           obligations to the Fund and its other clients
                           involved in the transaction..

                           (iii)     Directed Brokerage.  The Advisor may
                           direct the Subadvisor to use a particular broker or
                           dealer for one or more trades if, in the sole
                           opinion of the Advisor, it is in the best interest
                           of the Fund to do so.

                           (iv)      Brokerage Accounts.  The Advisor
                           authorizes and empowers the Subadvisor to direct
                           the Fund's custodian to open and maintain brokerage
                           accounts for securities and other property,
                           including financial and commodity futures and
                           commodities and options thereon (all such accounts
                           hereinafter called "brokerage accounts") for and in
                           the name of the Fund and to execute for the Fund as
                           its agent and attorney-in-fact standard customer
                           agreements with such broker or brokers as the
                           Subadvisor shall select as provided above.  The
                           Subadvisor may, using such of the securities and
                           other property in the Fund as the Subadvisor deems
                           necessary or desirable, direct the Fund's custodian
                           to deposit for the Fund original and maintenance
                           brokerage and margin deposits and otherwise direct
                           payments of cash, cash equivalents and securities
                           and other property into such brokerage accounts and
                           to such brokers as the Subadvisor deems desirable
                           or appropriate.

                  (g)      Social Screening.  The Advisor is responsible for
         screening those investments of the Fund subject to social screening
         ("Securities") to determine that the Securities investments meet the
         Fund's social investment criteria, as may be amended from time to
         time by the Trustees and for notifying the  Subadvisor of its
         determination.  The Subadvisor will buy only those Securities
         permitted by the Fund's investment program which the Advisor
         determines pass the Fund's social screens and of which the Advisor
         has notified the Subadvisor.  In the event that the Advisor notifies
         the Subadvisor that a security already in the Fund's portfolio no
         longer passes the Fund's social screen, the Advisor shall instruct
         the Subadvisor whether the Subadvisor should dispose of the security
         immediately or at such time as the Subadvisor believes would be least
         detrimental to the Fund.  To the extent instructed by the Advisor,
         the Subadvisor shall have no liability for the disposition of any
         securities under this paragraph.  With respect to this paragraph, the
         form of notification shall be mutually agreed upon by the parties.

                  (h)      Voting Proxies.  The Subadvisor agrees to take
         appropriate action (which includes voting) on all proxies for the
         Fund's portfolio investments in a timely manner in accordance with the
         Advisor's Proxy Voting Guidelines, a copy of which has been provided
         to the Subadvisor.

                  (i)      Furnishing Information for the Fund's Proxies and 
         Other Required Mailings.  The Subadvisor agrees to provide the
         Advisor in a timely manner with all information necessary, including
         information concerning the Subadvisor's controlling persons, for
         preparation of the Fund's proxy statements or other required
         mailings, as may be needed from time to time.

         2.       Books and Records.

                  (a)      In connection with the purchase and sale of the
         Fund's portfolio securities, the Subadvisor shall arrange for the
         transmission to the Fund's custodian, and/or the Advisor on a daily
         basis, of such confirmations, trade tickets or other documentation as
         may be necessary to enable the Advisor to perform its accounting and
         administrative responsibilities with respect to the management of the
         Fund.

                  (b)      Pursuant to Rule 31a-3 under the 1940 Act, Rule
         204-2 under the Investment Advisors Act of 1940, and any other
         applicable laws, rules or regulations regarding recordkeeping, the
         Subadvisor agrees that:  (i)  all records it maintains for the Fund
         are the property of the Fund; (ii) it will surrender promptly to the
         Fund or Advisor any such records upon the Fund's or Advisor's
         request; (iii) it will maintain for the Fund the records that the
         Fund is required to maintain under Rule 31a-1(b) or any other
         applicable rule insofar as such records relate to the investment
         affairs of the Fund for which the Subadvisor has responsibility under
         this Agreement; and (iv) it will preserve for the periods prescribed
         by Rule 31a-2 under the 1940 Act the records it maintains for the
         Fund.

                  (c)      The Subadvisor represents that it has adopted and
         will maintain at all times a suitable Code of Ethics that covers its
         activities with respect to its services to the Fund.

                  (d)      The Subadvisor shall supply to the Trust's Board of
         Trustees its policies on "soft dollars," trade allocations and
         brokerage allocation procedures.  The Subadvisor shall maintain
         appropriate fidelity bond and errors and omission insurance policies.

         3.       Exclusivity.  Each party and its affiliates may have
advisory, management service or other agreements with other organizations and
persons, and may have other interests and businesses; provided, however, that
during the term of the Agreement, the Subadvisor will not provide investment
advisory services ("Services") to any other investment company offered to the
public and registered under the 1940 Act which is "socially screened" and has
an investment objective, a Matrix and/or quantitative strategy and the same
asset class (large cap U.S. equity) as the Fund except to the extent that, as
of January 1, 1998 the Subadvisor has entered into a written agreement(s) to
provide such Services or to the extent mutually agreed upon in writing between
the parties.

         4.       Compensation.  The Advisor will pay to the Subadvisor as
compensation for the Subadvisor's services rendered pursuant to this Agreement
an annual Subadvisory fee as specified in one or more Schedules attached
hereto and made part of this Agreement.  Such fees shall be paid by the
Advisor (and not by the Fund).  Such fees shall be payable for each month
within 15 business days after the end of such month.  If the Subadvisor shall
serve for less than the whole of a month, the compensation as specified shall
be prorated based on the portion of the month for which services were
provided.  The Schedules may be amended from time to time, in writing agreed to
by the Advisor and the Subadvisor, provided that amendments are made in
conformity with applicable laws and regulations and the Declaration of Trust
and Bylaws of the Trust.  Any change in the Schedule pertaining to any new or
existing series of the Trust shall not be deemed to affect the interest of any
other series of the Trust and shall not require the approval of shareholders
of any other series of the Trust.

         5.       Assignment and Amendment of Agreement.  This Agreement
automatically shall terminate without the payment of any penalty in the event
of its assignment (as defined under the 1940 Act) or if the Investment
Advisory Agreement between the Advisor and the Trust relating to the Fund shall
terminate for any reason.  This Agreement constitutes the entire agreement
between the parties, and may not be amended except in a writing signed by both
parties.  This Agreement shall not be materially amended unless, if required
by Securities and Exchange Commission rules and regulations, such amendment is
approved by the affirmative vote of a majority of the outstanding shares of
the Fund, and by the vote, cast in person at a meeting called for the purpose
of voting on such approval, of a majority of the Trustees of the Trust who are
not interested persons of the Trust, the Advisor or the Subadvisor.

         6.       Duration and Termination of the Agreement.  This Agreement
shall become effective upon its execution; provided, however, that this
Agreement shall not become effective with respect to any Fund now existing or
hereafter created unless it has first been approved (a) by a vote of the
majority of those Trustees of the Trust who are not parties to this Agreement
or interested persons of such party, cast in person at a meeting called for
the purpose of voting on such approval, and (b) by a vote of a majority of
that Fund's outstanding voting securities.  This Agreement shall remain in
full force and effect with respect to a Fund continuously thereafter (unless
terminated automatically as set forth in Section 5.) except as follows:

                  (a)      The Trust may at any time terminate this Agreement
         without penalty with respect to any or all Funds by providing not
         less than 60 days written notice delivered or mailed by registered
         mail, postage prepaid, to the Advisor and the Subadvisor.  Such
         termination can be authorized by the affirmative vote of a majority
         of the (i) Trustees of the Trust or (ii) outstanding voting
         securities of the applicable Fund.

                  (b)      This Agreement will terminate automatically with
         respect to a Fund unless, within two years of the effective date of
         that Fund, and at least annually thereafter, the continuance of the
         Agreement is specifically approved by (i) the Trustees of the Trust
         or the shareholders of such Fund by the affirmative vote of a
         majority of the outstanding shares of such Fund, and (ii) a majority
         of the Trustees of the Trust who are not interested persons of the
         Trust, Advisor or Subadvisor, by vote cast in person at a meeting
         called for the purpose of voting on such approval.  If the
         continuance of this Agreement is submitted to the shareholders of any
         Fund for their approval and such shareholders fail to approve such
         continuance as provided herein, the Subadvisor may continue to serve
         hereunder in a manner consistent with the 1940 Act and the rules and
         regulations thereunder.

                  (c)      The Advisor may at any time terminate this
         Agreement with respect to any or all Funds by not less than 60 days
         written notice delivered or mailed by registered mail, postage
         prepaid, to the Subadvisor, and the Subadvisor may at any time
         terminate this Agreement with respect to any or all Funds by not less
         than 90 days written notice delivered or mailed by registered mail,
         postage prepaid, to the Advisor, unless otherwise mutually agreed in
         writing.

                  (d)      The Advisor may terminate this Agreement with
         respect to any or all Funds immediately by written notice if the
         Confidentiality and Non-Use Agreement referred to in Section 11 of
         this Agreement is, in the sole opinion of the Advisor, violated.

         Upon termination of this Agreement with respect to any Fund, the
duties of the Advisor delegated to the Subadvisor under this Agreement with
respect to such Fund automatically shall revert to the Advisor.

         7.       Notification to the Advisor.  The Subadvisor promptly shall
notify the Advisor in writing of the occurrence of any of the following events:

                  (a)  the Subadvisor shall fail to qualify as a "bank" under
         the Investment Advisors Act of 1940, as amended;

                  (b)  the Subadvisor shall have been served or otherwise have
         notice of any action, suit, proceeding, inquiry or investigation, at
         law or in equity, before or by any court, public board or body,
         directly involving the affairs of the Fund;

                  (c)  a material violation of the Subadvisor's Code of Ethics
         is discovered and, again, when action has been taken to rectify such
         violations; or

                  (d)  any other event, including but not limited to, a change
         in executive personnel or the addition or loss of major clients of
         the Subadvisor that might affect the ability of the Subadvisor to
         provide the Services provided for under this Agreement.

         8.       Definitions.  For the purposes of this Agreement, the terms
"vote of a majority of the outstanding Shares," "affiliated person," "control,"
"interested person" and "assignment" shall have their respective meanings as
defined in the 1940 Act and the rules and regulations thereunder subject,
however, to such exemptions as may be granted by the Securities and Exchange
Commission under said Act; and the term "specifically approve at least
annually" shall be construed in a manner consistent with the 1940 Act and the
rules and regulations thereunder.

         9.       Indemnification.  The Subadvisor shall indemnify and hold
harmless the Advisor, the Trust and their respective trustees, directors,
officers and shareholders from any and all claims, losses, expenses,
obligations and liabilities (including reasonable attorneys fees) arising or
resulting from the Subadvisor's willful misfeasance, bad faith, gross
negligence or reckless disregard of its duties hereunder.

         The Advisor shall indemnify and hold harmless the Subadvisor, the
Trust and their respective Trustees, directors, officers, employees and agents
and shareholders from any and all claims, losses, expenses, obligations and
liabilities (including reasonable attorneys fees) arising or resulting from
the Advisor's willful misfeasance, bad faith, gross negligence or reckless
disregard of its duties hereunder or under its Investment Advisory Agreement
with the Trust.

         10.      Applicable Law and Jurisdiction.  This Agreement shall be
governed by Maryland law, and any dispute arising from this Agreement or the
services rendered hereunder shall be resolved through legal proceedings,
whether state, federal, or otherwise, conducted in the state of Maryland or in
such other manner or jurisdiction as shall be mutually agreed upon by the
parties hereto.

         11.      Confidentiality.  This Agreement is not binding on the
Advisor unless the Subadvisor has signed and is subject to a confidentiality
and non-use agreement ("Non-Use Agreement") not materially different than the
one attached hereto as Exhibit 1.  For a period of two (2) years from the date
of termination of this Agreement, the Subadvisor shall not attempt to develop,
market or sell any product which uses or employs any Confidential Information,
as that term is defined in the Non-Use Agreement.

         12.      Miscellaneous.  Notices of any kind to be given to a party
hereunder shall be in writing and shall be duly given if mailed, delivered or
communicated by answer back facsimile transmission to such party at the
address set forth below, attention President, or at such other address or to
such other person as a party may from time to time specify.

         Subadvisor agrees that for a period of two (2) years from the date of
termination of this Agreement, it shall not directly or indirectly, hire,
employ or engage, or attempt to hire, employ or engage any employee of the
Advisor or any affiliate thereof without the prior written permission of the
Advisor.

         Each party agrees to perform such further acts and execute such
further documents as are necessary to effectuate the purposes hereof.  The
captions in this Agreement are included for convenience only and in no way
define or delimit any of the provisions hereof or otherwise affect their
construction or effect.

         Each party represents and warrants that it has all requisite
authority to enter into and carry out its responsibilities under this
Agreement.

         IN WITNESS WHEREOF, each of the parties has caused this instrument to
be signed in duplicate on its behalf by its duly authorized representative,
all as of the day and year first written above.

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

By:__________________      By:______________________________
 

Witness:                   State Street Bank and Trust Company
                           Two International Place
                           Boston, Massachusetts 02110
                           Attn.:  Compliance Officer
 
By:__________________      By:_______________________________

<PAGE>



             Fee Schedule to the Investment Subadvisory Agreement
                 between Calvert Asset Management Company, Inc.
                        and State Street Bank and Trust

         As compensation pursuant to Section 4 of the Investment Subadvisory
Agreement between Calvert Asset Management Company, Inc. (the "Advisor") and
State Street Bank and Trust (the "Subadvisor"), the Advisor shall pay the
Subadvisor an annual Subadvisory fee computed daily and payable monthly, at an
annual rate equal to the greater of: (a) 0.35% of the first $100 million of
average daily net assets of Calvert Social Investment Fund, Managed Index
Portfolio ("MIP") and 0.25% on the average daily net assets of MIP in excess of
$100 million or (b) $150,000 annually ("Minimum").  Compensation shall commence
on the first day Subadvisor provides active investment Subadvisory services for
MIP (Compensation Date).  The Minimum shall not apply to any annual period if
gross sales during such annual period are $55,000,000.00 or more.  Annual
periods shall start on the Compensation Date and each anniversary thereof.








                       ADMINISTRATIVE SERVICES AGREEMENT


         ADMINISTRATIVE  SERVICES  AGREEMENT,  made  this  24th day of  February
1998,  by and  between  CALVERT  ADMINISTRATIVE  SERVICES  COMPANY,  a  Delaware
corporation  having  its  principal  place of  business  in  Bethesda,  Maryland
("CASC"),  and CALVERT SOCIAL  INVESTMENT  FUND, a Massachusetts  business trust
(the "Fund").

         The parties to this  Agreement,  intending to be legally  bound,  agree
with each other as follows:

         1.       Provision  of  Services.  CASC  hereby  undertakes  to provide
each  portfolio  of the Fund set forth on the  attached  Schedule  ("Portfolio")
with  certain  administrative  services  that will be required in the conduct of
business.  Such  services  will include  maintaining  the Fund's  organizational
existence,  preparing the Portfolio's  prospectuses,  notices,  proxy materials,
reports to  regulatory  bodies and reports to  shareholders  of the  Portfolios,
determining  the amount of periodic  distributions  per share,  keeping  certain
books and  records,  and such other  incidental  administrative  services as are
necessary to the conduct of the  Portfolio's  affairs.  Additionally,  CASC will
provide  oversight  and  compliance  with  respect  to  publications   (such  as
newsletters,   prospectuses,   shareholder   reports,   internet   and   website
materials),  shareholder complaints,  governmental inquiries, subpoenas, levies,
judicial   proceedings,   review  of  sales   literature  (in  addition  to  the
above-referenced  publications),  federal and state  registration  requirements,
draft  writing  (if  applicable)  and  check  depositing  procedures,  Automatic
Clearing  House  procedures,  shareholder  service  surveys and fraud  oversight
procedures.  The Fund hereby  engages  CASC to provide the  Portfolio  with such
services,  or to  cause  such  services  to be  provided  to the  Fund by  third
parties.

         2.       Scope  of  Authority.  CASC  will  be at  all  times,  in  the
performance  of its  functions  under this  Agreement,  subject to any direction
and control of the  Trustees of the Fund and of its  officers,  and to the terms
of  the  Fund's  Declaration  of  Trust  and  Bylaws  and of  the  then  current
prospectus   and  statements  of  additional   information   applicable  to  the
Portfolios,  except only that it will have no  obligation to provide to the Fund
any services that are clearly  outside the scope of those  contemplated  in this
Agreement.   In  the  performance  of  its  duties   hereunder,   CASC  will  be
authorized  to take such action not  inconsistent  with the  express  provisions
hereof as it deems  advisable.  It may  contract  with other  persons to provide
to the  Portfolio  any of the services  contemplated  herein under such terms as
it deems  reasonable  and will have the  authority to direct the  activities  of
such other persons in the manner it deems appropriate.

         3.       Other  Activities  of  CASC.  CASC  and any of its  affiliates
will be free to engage in any other lawful  activity,  including  the  rendering
to  others  of  services  similar  to those  to be  rendered  to the  Portfolios
hereunder;  and CASC or any interested  person thereof will be free to invest in
any  Portfolio  as  shareholder,  to become an officer or Trustee of the Fund if
properly  elected,  or to  enter  into  any  other  relationship  with  the Fund
approved by the Trustees and in accordance with law.

         CASC agrees that it will not deal with the Fund in any  transaction  in
which  CASC acts as a  principal,  except to the extent as may be  permitted  by
the terms of this Agreement.

         4.       Recordkeeping  and Other  Information.  CASC will,  commencing
on the  effective  date of this  Agreement,  create and maintain  all  necessary
administrative  records  of the  Portfolio  in  accordance  with all  applicable
laws,  rules and  regulations,  including but not limited to records required by
Section  31(a) of the  Investment  Company  Act of 1940,  as amended  (the "1940
Act"),  and the Rules  thereunder,  as amended  from time to time.  All  records
will be the property of the Fund and will be available  for  inspection  and use
by the Fund.

         5.       Audit,  Inspection  and  Visitation.  CASC will make available
during   regular   business  hours  all  records  and  other  data  created  and
maintained  pursuant to this  Agreement for  reasonable  audit and inspection by
the  Securities  and Exchange  Commission  (the  "SEC"),  the Fund or any person
retained by the Fund.

         6.       Compensation   to  CASC.  CASC  will  be  compensated  by  the
Portfolios on a monthly basis for the services  performed  under this Agreement,
the rate of  compensation  being  set  forth in  Schedule  A.  CASC  will not be
responsible  for any  costs or  expenses  of the  Portfolios  other  than  those
specifically  assumed  in  Paragraph  1.  Expenses  incurred  by  CASC  will  be
reimbursed to CASC by the Portfolio,  as appropriate;  such expenses may include
expenses  incidental  to  meetings of  shareholders,  taxes and  corporate  fees
levied  against  the  Fund  or  its  Portfolios,   expenses  of  printing  stock
certificates  representing  shares  of the  Portfolios,  expenses  of  printing,
mailing  notices,  proxy material,  reports to regulatory  bodies and reports to
shareholders  of  the  Portfolio,   expenses  of  typesetting  prospectuses  and
printing  and  mailing   prospectuses  to  shareholders,   and  data  processing
expenses  incidental to maintenance  of books and records.  Such charges will be
payable in full upon receipt of a billing  invoice;  in lieu of reimbursing CASC
for expenses  incurred the Portfolio  may, in its  discretion,  directly pay any
expenses.

         7.       Use of  Names.  The Fund  will not use the name of CASC in any
prospectus,  sales  literature  or other  material  relating  to the Fund or its
Portfolios in any manner  without  prior  approval by CASC;  provided,  however,
that  CASC  will  approve  all uses of its name that  merely  refer in  accurate
terms to its  appointment or that are required by the SEC or a State  Securities
Commission;  and  provided,  further,  that in no event  will such  approval  be
unreasonably  withheld.  CASC  will  not  use  the  name  of  the  Fund  or  its
Portfolios  in any  material  relating  to  CASC  in any  manner  without  prior
approval by the Fund;  provided,  however,  that the Fund will  approve all uses
of its name or the names of its  Portfolios  that merely refer in accurate terms
to  the  appointment  of  CASC  or  that  are  required  by the  SEC or a  State
Securities  Commission;  and  provided,  further,  that  in no  event  will  the
approval be unreasonably withheld.

         8.       Security.  CASC  represents  and warrants that, to the best of
its  knowledge,  the  various  procedures  and  systems  that CASC  proposes  to
implement  with  regard to  safeguarding  from loss or  damage  attributable  to
fire, theft or any other cause  (including  provision for twenty-four hour a day
restricted  access) the Fund's books and records  administered  pursuant to this
Agreement and CASC's  records,  data,  equipment,  facilities and other property
used in the  performance  of its  obligations  under this Agreement are adequate
and that it will implement  them in a manner and make such changes  therein from
time to time as in its judgment are required for the secure  performance  of its
obligations under this Agreement.

         9.       Limitation  of  Liability.  The Fund will  indemnify  and hold
CASC  harmless  against any losses,  claims,  damages,  liabilities  or expenses
(including  reasonable  counsel  fees and  expenses)  resulting  from any claim,
demand,  action or suit brought by any person  (including a  shareholder  naming
the  Fund  or any of  its  Portfolios  as a  party)  other  than  the  Fund  not
resulting  from  CASC's  negligence,  or caused by errors of judment or mistakes
of law  committed  by CASC in a good faith  effort to carry out its duties under
this Agreement.

         In  no  event  will  CASC  be  liable   for   indirect,   special,   or
consequential  damages  (even if CASC has been  advised  of the  possibility  of
such damages)  arising from the obligations  assumed  hereunder and the services
provided  for by this  Agreement,  including  but not  limited to lost  profits,
loss  of  use of  accounting  systems,  cost  of  capital,  cost  of  substitute
facilities,  programs  or  services,  downtime  costs,  or claims of the  Fund's
shareholders for such damage.

         10.      Limitation  of Fund's  Liability.  CASC  acknowledges  that it
has received  notice of and accepts the  limitation  upon the Fund's  liability.
CASC  agrees  that the  Fund's  obligations  in any case will be  limited to the
Fund  or its  Portfolios  and  to  the  assets  and  that  CASC  will  not  seek
satisfaction  of  any  such  obligation  from  the  shareholders  nor  from  any
Director, officer, employee or agent of the Fund.

         11.      Force  Majeure.  CASC will not be liable  for delays or errors
occurring  by reason of  circumstances  beyond its  control,  including  but not
limited  to acts of civil or  military  authority,  national  emergencies,  work
stoppages,  fire, flood catastrophe,  acts of God,  insurrection,  war, riot, or
failure  of   communication   or  power  supply.   In  the  event  of  equipment
breakdowns  beyond its  control,  CASC will take  reasonable  steps to  minimize
service interruptions but will have no liability with respect thereto.

         12.      Amendments.  CASC and the Fund  will  regularly  consult  with
each  other  regarding  CASC's   performance  of  its  obligations   under  this
Agreement.   Any  change  in  the  Fund's  registration   statements  under  the
Securities  Act of 1933,  as amended,  or the 1940 Act or in the forms  relating
to any plan,  program or  service  offered by the  current  prospectuses  of the
Portfolios that would require a change in CASC's  obligations  hereunder will be
subject to CASC's approval, which will not be unreasonably withheld.

         13.      Duration,  Termination,  etc.  Neither this  Agreement nor any
of its  provisions may be changed,  waived,  discharged,  or terminated  orally,
but only by  written  instrument  which  will make  specific  reference  to this
Agreement  and which will be signed by the party against  which  enforcement  of
such change,  waiver,  discharge or termination  is sought.  This Agreement will
continue in effect until two years from the date hereof,  and  thereafter as the
parties may  mutually  agree;  provided,  however,  that this  Agreement  may be
terminated  as to any or all  Portfolios  at any  time by  sixty  days'  written
notice  given by CASC to the Fund or sixty  days'  written  notice  given by the
Fund to CASC;  and  provided  further  that  this  Agreement  may be  terminated
immediately  at any time for cause  either by the Fund or CASC in the event that
such cause  remains  unremedied  for no less than ninety  days after  receipt of
written  specification  of such cause.  Any such termination will not affect the
rights and  obligations  of the parties  under  Paragraphs  9 and 10 hereof.  In
the event that the Fund  designates  a  successor  to any of CASC's  obligations
under this  Agreement,  CASC will,  at the  expense and  direction  of the Fund,
transfer  to  such  successor  all  relevant  books,   records  and  other  data
established or maintained by CASC.

         14.      Miscellaneous.  Each  party  agrees to  perform  such  further
acts and execute such  further  documents as are  necessary  to  effectuate  the
purposes of this  Agreement.  This  Agreement  will be construed and enforced in
accordance  with and  governed  by the laws of  Maryland.  The  captions in this
Agreement  are  included  for  convenience  only and in no way define or delimit
any of the provisions hereof or otherwise affect their construction or effect.

         IN WITNESS  WHEREOF,  the parties have duly executed this  Agreement as
of the day and year first above written.



         CALVERT ADMINISTRATIVE SERVICES COMPANY


         BY ___________________________                                         


         CALVERT SOCIAL INVESTMENT FUND


         BY ___________________________                                         



<PAGE>

                       ADMINISTRATIVE SERVICES AGREEMENT
                          CSIF MANAGED INDEX PORTFOLIO
                                   SCHEDULE A


         For  services  under  this  Administrative   Services  Agreement,   the
Managed Index  Portfolio of Calvert Social  Investment Fund shall pay to Calvert
Administrative  Services  Company a fee,  computed daily and payable  monthly at
the annual rate set forth  below  based on the  average  daily net assets of the
respective class.

Class A           0.15%

Class B           0.15%

Class C           0.15%

Class I           0.10%






                         CALVERT SOCIAL INVESTMENT FUND

                  PLAN OF DISTRIBUTION PURSUANT TO RULE 12b-1
                    UNDER THE INVESTMENT COMPANY ACT OF 1940

                                    Class A

As permitted by Rule 12b-1 under the Investment company Act of 1940 and in
accordance with the terms and conditions of this Distribution Plan ("Plan"),
as hereinafter set forth, Calvert Social Investment Fund ("Fund") may incur
certain expenditures to promote the Fund and further the distribution of
shares of Fund.

1. Payment of Distribution Expenses. (a) The Fund may incur expenditures for
certain expenses associated with the distribution of its shares. Such
distribution expenses include, but need not be limited to: the cost of
printing and mailing prospectuses, sales literature and other relevant
material to other than current shareholders of the Fund; advertising and
public relations; and payments to sales personnel, broker-dealers and other
third parties in return for distribution assistance. Payments for distribution
expenses incurred by the Fund pursuant to this Plan may be made directly or
indirectly; however, all agreements with any person relating to the
implementation of this Plan shall be in writing, and such agreements shall be
subject to termination, without penalty, pursuant to the provisions of
paragraph 2(c) of this Plan.

         (b) Distribution expenses incurred by the Fund pursuant to this Plan
may not exceed, on an annual basis, 0.35% of the Managed Growth, Equity and
Bond Portfolios' average daily net assets and 0.25% of the Money Market
Portfolio's average daily net assets.

         (c) Nothing in this Plan shall operate or be construed to limit the
extent to which the Fund's investment Advisor or any other person, other than
the Fund, at its expense apart from this Plan, may incur costs and pay
expenses associated with the distribution of Fund shares.

         2.       Effective Date and Term.  (a) This Plan shall become
effective upon approval by majority votes of (i) the Board of Trustees of the
Fund and the Trustees who are not interested persons within the meaning of
Section 2(a) (19) of the Investment Company Act of 1940 and have no direct or
indirect financial o interest in the operation of the Plan or in any
agreements related to the Plan (such trustees are hereinafter referred to as
"Qualified Trustees"), cast in person at a meeting called for the purpose of
voting on this Plan, and (ii) the outstanding voting securities of the Fund.

         b)       This Plan shall remain in effect for one year from its
adoption date and may continue in effect thereafter if this Plan is approved
at least annually by a majority vote of the trustees of the Fund, including a
majority of the Qualified Trustees, cast in person at a meeting called for the
purpose of voting on the Plan.

         c).      .This Plan may be terminated at any time by a majority vote
of the Qualified Trustees or by vote of a majority of the outstanding voting
securities of the Fund or, with respect to a Portfolio, by a vote of a
majority of the outstanding voting securities of that Portfolio.

         3.       Reports.  The person authorized to direct the disposition of
monies paid or payable by the Fund pursuant to 'he Plan shall provide, on at
least a quarterly basis, a written report to The Fund's Board of Trustees of
the amounts expended pursuant to this Plan or any related agreement and the
purposes for which such expenditures were made.

         4. Selection of Disinterested Trustees. While this Plan is in effect,
the selection and nomination ~f those trustees who are not interested persons
of the Fund within the meaning of Section 2(a)(19) of the Investment Company
Act of 1940 shall be committed to the discretion of the trustees then in
office who are not interested persons of the Fund.

         5. Effect of Plan. This Plan shall not obligate the Fund or any other
person to enter into an agreement with any particular person.

         6. Amendment. This Plan may not be amended to increase materially the
amount authorized in paragraph l(b) hereof to be spent for distribution
without approval by a vote of the majority of the outstanding securities of
the Fund or, with respect to a Portfolio, by a vote of a majority of the
outstanding voting securities of the Portfolio.  All material amendments to
this Plan must be approved by a majority vote of the Board of Trustees of the
Fund, and of the Qualified Trustees, cast in person at a meeting called for
the purpose of voting thereon.




As amended by Shareholders
on September 28, 1990

<PAGE>
 


                         Calvert Social Investment Fund
                            Managed Index Portfolio

                  PLAN OF DISTRIBUTION PURSUANT TO RULE 12B-1
                    UNDER THE INVESTMENT COMPANY ACT OF 1940



Class A Distribution Plan expenses incurred by the Portfolio, pursuant to this
Plan may not exceed, on an annual basis, 0.25%, of the Portfolio's Class A
average daily net assets.

<PAGE>




                           THE CALVERT GROUP OF FUNDS

                              CLASS B and CLASS C
                               DISTRIBUTION PLAN

                           as approved by the Boards
                  in November 1993 and as amended and restated
                      February 1998 Pursuant to Rule 12b-1
                    Under the Investment Company Act of 1940

         This Distribution Plan applies to Class B and Class C in each
portfolio of the Calvert Funds listed in Schedule A (each a "Fund" and
together, the "Funds") and to any future class for which this Distribution
Plan has been approved in accordance with paragraph 2(a) below.  For purposes
of this Distribution Plan each series portfolio of a Fund is referred to
herein as a "Series" and together, as the "Series".

         As permitted by Rule 12b-1 under the Investment Company Act of 1940
and in accordance with the terms and conditions of this Plan, as hereinafter
set forth, a Fund may incur certain expenditures to promote itself and further
the distribution of its shares.

         1.       Payment of Fee

         (a)      As compensation for certain services performed and expenses
assumed by each Fund's distributor and principal underwriter ("Distributor")
each Fund may pay the Distributor a distribution fee (the "Distribution
Fee").  The Distribution Fee is intended to compensate the Distributor for its
marketing efforts, which include, but are not limited to the following costs:
commissions and other payments advanced to sales personnel and third parties
and  related interest costs as permitted by the rules of the National
Association of Securities Dealers, Inc. ("NASD"), printing and mailing
prospectuses, sales literature and other relevant material to other than
current shareholders, advertising and public relations, telemarketing,
marketing-related overhead expenses and other distribution costs.  Such
Distribution Fee is in addition to any NASD service fee that may be paid
hereunder and as described at Section 3(b) of the Distribution Agreement
between the respective Funds and the Distributor, or any front-end or deferred
sales charges the Distributor receives from a Fund with respect to sales or
redemption of Fund shares.  Total fees paid pursuant to this Plan, including
the Distribution Fee described above, and the NASD service fee, shall not
exceed the rate set forth in the attached Schedule B to this Plan.  All
agreements with any person relating to the implementation of this Plan shall
be in writing, and such agreements shall be subject to termination, without
penalty, pursuant to the provisions of paragraph 2(c) of this Plan.


<PAGE>



                                      -6-

         (b)      A Fund will pay each person which has acted as principal
underwriter of its Class B shares its Allocable Portion (as such term is
defined in the Distribution Agreement pursuant to which such person acts or
acted as principal underwriter of the Class B Shares (the "Applicable
Distribution Agreement")) of the Distribution Fee in respect of Class B Shares
of the Fund.  Such person shall be paid its Allocable Portion of such
Distribution Fees notwithstanding such person's termination as Distributor of
the Class B Shares of the Fund, such payments to be changed or terminated
only: (i) as required by a change in applicable law or a change in accounting
policy adopted by the Investment Companies Committee of the AICPA and approved
by FASB that results in a determination by the Fund's independent accountants
that any asset based sales charges (as that term is defined by the NASD) in
respect of such Fund, and which are not yet due and payable, must be accounted
for by such Fund as a liability in accordance with GAAP, each after the
effective date of this restated Distribution Plan; (ii) if in the sole
discretion of the Board of Trustees/Directors, after due consideration of the
relevant factors considered when adopting and/or amending this Distribution
Plan including the transactions contemplated in that certain Purchase and Sale
Agreement entered into between a Fund's Distributor and the commission
financing entity, the Board of Trustees/Directors determines, subject to its
fiduciary duty, that this Distribution Plan and the payments thereunder must
be changed or terminated, notwithstanding the effect this action might have on
the Fund's ability to offer and sell Class B shares; or (iii) in connection
with a Complete Termination of this Distribution Plan, it being understood
that for this purpose a Complete Termination of this  Distribution Plan occurs
only if, as to a Fund or Series, this Distribution Plan is terminated and the
Fund has not adopted any other distribution plan with respect to its Class B
or other substantially similar class of shares.  The services rendered by a
Distributor for which that Distributor is entitled to receive its Allocable
Portion of the Distribution Fee shall be deemed to have been completed at the
time of the initial purchase of the Commission Shares (as defined in the
Distribution Agreement) taken into account in computing that Distributor's
Allocable Portion of the Distribution Fee.

         The obligation of a Fund to pay the Distribution Fee shall terminate
upon the termination of this Distribution Plan as to such Fund in accordance
with the terms hereof.  Except as provided in the preceding paragraph, a
Fund's obligation to pay the Distribution Fee to a Distributor of the Class B
Shares of the Fund shall be absolute and unconditional and shall not be
subject to any dispute, offset, counterclaim or defense whatsoever (it being
understood that nothing in this sentence shall be deemed a waiver by a Fund of
its right separately to pursue any claims it may have against such Distributor
and enforce such claims against any assets (other than its right to be paid
its Allocable Portion of the Distribution Fee and to be paid the contingent
deferred sales charges) of such Distributor).

         The right of a Distributor to receive the Distribution Fee, but not
the relevant Distribution Agreement or that Distributor's obligations
thereunder, may be transferred by that Distributor in order to raise funds
which may be useful or necessary to perform its duties as principal
underwriter, and any such transfer shall be effective upon written notice from
that Distributor to the Fund.  In connection with the foregoing, each Fund is
authorized to pay all or part of the Distribution Fee directly to such
transferee as directed by that Distributor.


         (c)      Nothing in this Distribution Plan shall operate or be
construed to limit the extent to which the Fund's Investment Advisor or any
other person, other than the Fund, at its expense apart from the Distribution
Plan, may incur costs and pay expenses associated with the distribution of
Fund shares.

         2.       Effective Date and Term

         (a)      This Distribution Plan shall become effective as to any
Class of any Series upon approval by majority votes of (i) the Board of the
Fund and the members thereof who are not interested persons within the meaning
of Section 2(a)(19) of the Investment Company Act of 1940 and have no direct
or indirect financial interest in the operation of the Distribution Plan or in
any agreements related to the Distribution Plan ("Qualified
Trustees/Directors"), cast in person at a meeting called for the purpose of
voting on this Distribution Plan, and (ii) the outstanding voting securities
of the Fund.

         (b)      This Distribution Plan shall remain in effect for one year
from its adoption date and may continue in effect thereafter if this
Distribution Plan is approved at least annually by a majority vote of the
Board of the Fund, including a majority of the Qualified Trustees/Directors,
cast in person at a meeting called for the purpose of voting on the
Distribution Plan.

         (c)      Subject to paragraph 1(b) above, this Distribution Plan may
be terminated at any time without payment of any penalty by a majority vote of
the Qualified Trustees/Directors or by vote of a majority of the outstanding
voting securities of the Fund, or, with respect to the termination of this
Distribution Plan as to a particular Class of a Portfolio, by a vote of a
majority of the outstanding voting securities of that Class.

         (d)      The provisions of this Distribution Plan are severable for
each Series or Class, and whenever action is to be taken with respect to this
Distribution Plan, that action must be taken separately for each Series or
Class affected by the matter.

         3.       Reports

                  The person authorized to direct the disposition of monies
paid or payable by the Fund pursuant to the Distribution Plan shall provide,
on at least a quarterly basis, a written report to each Fund's Board of the
amounts expended pursuant to this Distribution Plan or any related agreements
and the purposes for which such expenditures were made.

         4.       Selection of Disinterested Trustees/Directors

                  While this Distribution Plan is in effect, the selection and
nomination of those Trustees/Directors who are not interested persons of a
Fund within the meaning of Section 2(a)(19) of the Investment Company Act of
1940 shall be committed to the discretion of the Trustees/Directors then in
office who are not interested persons of the Fund.
 
         5.       Effect of Plan

                  This Distribution Plan shall not obligate the Fund or any
other party to enter into an agreement with any particular person.

         6.       Amendment

                  This Distribution Plan may not be amended to increase
materially the amount authorized in paragraph 1 hereof to be spent by a Fund
for distribution without approval by a vote of the majority of the outstanding
shares of such Fund, except that if the amendment relates only to a particular
Class of a Fund, such approval need only be by a vote of the majority of the
outstanding shares of that Class.  All material amendments to this
Distribution Plan must be approved by a majority vote of the Board of the
Fund, and of the Qualified Trustees/Directors, cast in person at a meeting
called for the purpose of voting thereon.


   

<PAGE>

                                   SCHEDULE A


The Calvert Fund

Calvert Tax-Free Reserves

Calvert Municipal Fund

Calvert Social Investment Fund

Calvert World Values Fund

Calvert New World Fund

First Variable Rate Fund




 


<PAGE>

                              SCHEDULE B


         The total fees paid by the respective Class of each Series
of a Fund pursuant to this Distribution Plan shall not exceed the
rate, as a percentage of that Class' average annual net assets, set
forth below:


     Fund/Series                     Class B                     Class C
                             Distribution     Service    Distribution  Service
                             Fee              Fee        Fee           Fee
The Calvert Fund
     Calvert New Vision
     Small Cap Fund          0.75            0.25        0.75          0.25
     Calvert Income Fund     0.75            0.25        0.75          0.25

Calvert Tax-Free Reserves
     Long-Term               0.75            0.25        0.75          0.25
     Vermont Municipal       0.75            0.25        0.75          0.25

Calvert Municipal Fund
     National                0.75            0.25        N/A           N/A
     California              0.75            0.25        N/A           N/A
     Maryland                0.75            0.25        N/A           N/A
     Virginia                0.75            0.25        N/A           N/A

Calvert Social Investment Fund
     Managed Growth          0.75           0.25        0.75           0.25
     Equity                  0.75           0.25        0.75           0.25
     Bond                    0.75           0.25        0.75           0.25
     Managed Index           0.75           0.25        0.75           0.25

Calvert World Values Fund
     International Equity   0.75            0.25        0.75           0.25
     Capital Accumulation   0.75            0.25        0.75           0.25
 
Calvert World Values Fund
     Calvert New Africa     0.75             0.25       0.75           0.25

First Variable Rate Fund
     Calvert First Gov.
     Money Market           0.75             0.25        N/A            N/A

Restated Feb. 1998
  







                                      -1-




                           THE CALVERT GROUP OF FUNDS

                         Rule 18f-3 Multiple Class Plan
                           as approved by the Boards
                   in January 1996 and as amended and restated
                      February 1998 Pursuant to Rule 18f-3
                    Under the Investment Company Act of 1940


         Rule 18f-3 under the Investment Company Act of 1940, as amended (the
"1940 Act"), requires that an investment company desiring to offer multiple
classes of shares pursuant to the Rule adopt a plan setting forth the
differences among the classes with respect to shareholder services,
distribution arrangements, expense allocations and any related conversion
features or exchange privileges.  Any material amendment to the plan must be
approved by the investment company's Board of Trustees/Directors, including a
majority of the disinterested Board members, who must find that the plan is in
the best interests of each class individually and the investment company as a
whole.

         This Rule 18f-3 Multiple Class Plan ("Plan") shall apply to those
funds in the Calvert Group of Funds listed in Exhibit I (each a "Fund" and
collectively, "Funds") and to any future fund for which this Plan has been
approved in accordance with the above paragraph.

         The provisions of this Plan are severable for each Fund or Series
thereof ("Series") or Class, and whenever action is to be taken with respect
to this Plan, that action must be taken separately for each Fund, or Series
Class affected by the matter.
 
         1.       Class Designation.  A Fund may offer shares designated Class
A, Class B, Class C , Class I, and for certain money market portfolios, Class
O.

         2.       Differences in Availability.  Class A, Class B, Class C, and
Class O shares shall each be available through the same distribution channels,
except that (a) Class B shares may not be available through some dealers and
are not available for purchases of $500,000 or more, (b) Class B shares of
Calvert First Government Money Market Fund are available only through exchange
from Class B or Class C shares of another Calvert Fund, and (c) Class C shares
may not be available through some dealers and are not available for purchases
of $1 million or more.  Class I shares are generally available only directly
from Calvert Group and not through dealers, and each Class I shareholder must
maintain a $1 million minimum account balance.

         3.       Differences in Services.  The services offered to
shareholders of each Class shall be substantially the same, except that the
Rights of Accumulation, Letters of Intent and Reinvestment Privileges shall be
available only to holders of Class A shares.  Class I purchases and
redemptions may only be made by bankwire.

         4.       Differences in Distribution Arrangements.  Class A shares
shall be offered with a front-end sales charge, as such term is defined in
Rule 2830 of the Conduct Rules of the National Association of Securities
Dealers, Inc.  The amount of the sales charge on Class A shares is set forth
at Exhibit II.   Class A shares shall be subject to a Distribution Plan
adopted pursuant to Rule 12b-1 under the 1940 Act.  The amount of the
Distribution Plan expenses for Class A shares, as set forth at Exhibit  II,
are used to pay the Fund's principal underwriter for distributing and or
providing services to the Fund's Class A shares. This amount includes a
service fee at the annual rate of .25 of 1% of the value of the average daily
net assets of Class A.

         Class B shares shall be offered with a contingent deferred sales
charge ("CDSC") and no front-end sales charge.  The amount of the CDSC on
Class B shares is set forth at Exhibit II.  Class B shares shall be subject to
a Distribution Plan adopted pursuant to Rule 12b-1 under the 1940 Act.  The
amount of the Distribution Plan expenses for Class B shares, as set forth at
Exhibit II, are used to pay each Fund's principal underwriter for distributing
and or providing services to the Fund's Class B shares.  This amount includes
a service fee at the annual rate of .25 of 1% of the value of the average
daily net assets of Class B.

         Class C shares shall not be subject to a front-end sales charge, but
shall be subject to a 1.00% CDSC if the shares are redeemed within one year of
purchase.  Class C shares shall be subject to a Distribution Plan adopted
pursuant to Rule 12b-1 under the 1940 Act.  The amount of the Distribution
Plan expenses for Class C shares are set forth at Exhibit II.  The Class C
Distribution Plan pays each applicable Fund's principal underwriter for
distributing and or providing services to such Fund's Class C shares.  This
amount includes a service fee at the annual rate of .25 of 1% of the value of
the average daily net assets of Class C.

         Class I and Class O shares shall be subject to neither a front-end
sales charge, nor a CDSC, nor are they subject to a Distribution Plan adopted
pursuant to Rule 12b-1 under the 1940 Act.

         5.       Expense Allocation.  The following expenses shall be
allocated, to the extent practicable, on a Class-by-Class basis:  (a)
Distribution Plan fees; (b) transfer agent fees; (c) administrative service
fees; (d) printing and postage expenses payable by a Fund relating to
preparing and distributing materials, such as proxies, reports and
prospectuses to current shareholders of a specific class; (e) class specific
state notification fees; (f) class specific litigation or other legal
expenses; (g) certain class specific reimbursement from the Advisor; and (h)
certain class specific contract services (e.g., proxy solicitation).

         6.       Conversion Features.  Class B shares shall be subject to an
automatic conversion feature into Class A shares after they have been held for
that number of years set forth in Exhibit II.  Class A, Class C ,Class I, and
Class O are not subject to automatic conversion.

         7.       Exchange Privileges.  Class A shares shall be exchangeable
only for: (a) Class A shares of other funds managed or administered by the
Calvert Group; (b) shares of funds managed or administered by the Calvert
Group which do not have separate share classes; and (c) shares of certain
other funds specified from time to time.

         Class B shares shall be exchangeable only for: (a) Class B shares of
other funds managed or administered by the Calvert Group; (b) Class A shares
of other funds managed or administered by the Calvert Group, if the front-end
load on the Class A shares is paid at the time of the exchange; and (c) shares
of certain other funds specified from time to time.

         Class C shares shall be exchangeable only for: (a) Class C shares of
other funds managed or administered by the Calvert Group and Class B shares of
Calvert First Government Money Market Fund; (b) Class A shares of other funds
managed or administered by the Calvert Group, if the front-end load on the
Class A shares is paid at the time of the exchange; and (c) shares of certain
other funds specified from time to time.

         Class I shares shall be exchangeable only for: (a) Class I shares of
other funds managed or administered by the Calvert Group; (b) Class A shares
of other funds managed or administered by the Calvert Group, if the front-end
load on the Class A shares is paid at the time of the exchange; and (c) shares
of certain other funds specified from time to time.



February 1998

 

<PAGE>
 
Exhibit I

The Calvert Fund

Calvert Tax-Free Reserves

Calvert Municipal Fund

Calvert Social Investment Fund

Calvert World Values Fund

Calvert New World Fund

First Variable Rate Fund


<PAGE>

                                                                      Exhibit II

                     Calvert Social Investment Fund (CSIF)



                           Maximum Class A   Maximum Class A  Maximum Class C
                           Front-End Sales     12b-1 Fee       12b-1Fee
                           Charge

CSIF Managed Growth                  
                           4.75%                 0.35%         1.00%

CSIF Equity                4.75%                 0.35%         1.00%

CSIF Managed Index         4.75%                 0.25%         1.00%

CSIF Bond                  3.75%                 0.35%         1.00%


Class B
                                            Managed. Growth,
                                            Equity, and
Maximum
Contingent Deferred Sales Charge            Managed Index     Bond
12b-1 Fee
 Shares held less than
one year after purchase                     5%                4%
    1.00%
More than one year
but less than two                           4%                3%
More than two years
but less than three                         4%                2%
More than three years
but less than four                          3%                1%
More than four years
but less than five                          2%
More than five years
 but less than six                          1%

Converts to Class A after                   8 yrs.             6yrs.

February 1998
 

<PAGE>

                                                                      Exhibit II

                        Calvert Tax-Free Reserves (CTFR)



                           Maximum            Maximum          Maximum
                           Class A            Class A          Class C
                           Front-End Sales    12b-1 Fee        12b-1Fee
                           Charge


CTFR Long-Term             3.75%             0.35%             1.00%

CTFR Vermont               3.75%             N/A               1.00%


Class B
 
                                            Long Term              Maximum
                                            and                    Class B
Contingent Deferred Sales Charge            Vermont  12b-1 Fee
 Shares held less than one year
after purchase                              4%                      1.00%
More than one year
 but less than two                          3%
More than two years
but less than three                         2%
More than three years
 but less than four                         1%


Converts to Class A after                   6yrs.


February 1998
 



<PAGE>

                                                                      Exhibit II

                             Calvert Municipal Fund



                           Maximum           Maximum           Maximum
                           Class A           Class A           Class B
                           Front-End Sales   12b-1 Fee         12b-1Fee
                           Charge


National Intermediate      2.75%            .25%               N/A
 
California Intermediate    .75%             .25%               N/A

Maryland Intermediate      2.75%            0.25%              N/A

Virginia Intermediate      2.75%            0.25%              N/A

Class B                                              Maximum Class B
Contingent Deferred Sales Charge                     12b-1 Fee
Shares held less than one year
after purchase                              3%           1.00%
More than one year
but less than two                           2%
More than two years
 but less than three                        2%
More than three years
 but less than four                         1%

Converts to Class A after                   4 yrs.


February 1998
 



<PAGE>

                                                                      Exhibit II
                                The Calvert Fund



                           Maximum             Maximum        Maximum
                           Class A               Class A      Class C
                           Front-End Sales       12b-1 Fee    12b-1Fee
                           Charge


New Vision Small Cap       4.75%                 0.25%        1.00%

Calvert Income Fund        3.75%                 0.50%        1.00%


Class B
Maximum Class B
Contingent Deferred
 Sales Charge              New Vision       Income            12b-1 Fee
Shares held less than
 one year                  5%                    4%           1.00%
More than one year
 but less than two         4%                    3%
More than two years
but less than three        4%                    2%
More than three years
 but less than four        3%                    1%
More than four years
 but less than five        2%
More than five years
 but less than six         1%

Converts to Class A after  8 yrs            6yrs.


February 1998
 


<PAGE>

                                                                      Exhibit II
                           Calvert World Values Fund



                           Maximum          Maximum   Maximum
                           Class A          Class A           Class C
                           Front-End Sales  12b-1 Fee         12b-1Fee
                           Charge


International Equity       4.75%            0.35%             1.00%

Capital Accumulation       4.75%            0.35%             1.00%


Class B                                              Maximum Class B
Contingent Deferred Sales Charge                     12b-1 Fee
Shares held less than
one year after purchase                     5%        1.00%
More than one year
but less than two                           4%
More than two years
 but less than three                        4%
More than three years
but less than four                          3%
More than four years
 but less than five                         2%
More than five years
but less than six                           1%

Converts to Class A after                   8 yrs.


February 1998
 
 


<PAGE>

                                                                      Exhibit II
                             Calvert New World Fund



                            Maximum           Maximum         Maximum
                            Class A           Class A         Class C
                            Front-End Sales   12b-1 Fee       12b-1Fee
                            Charge


Calvert New Africa            4.75%            0.25%             1.00%


Class B                                                       Maximum
                                                              Class B
Contingent Deferred Sales Charge                              12b-1 Fee
 Shares held less than one year after purchase   5%           1.00%
More than one year but less than two             4%
More than two years but less than three          4%
More than three years but less than four         3%
More than four years but less than five          2%
More than five years but less than six           1%

Converts to Class A after                        8 yrs.


February 1998
 



<PAGE>

                                                                      Exhibit II
                            First Variable Rate Fund



                           Maximum            Maximum           Maximum
                           Class A            Class A           Class C
                           Front-End Sales    12b-1 Fee         12b-1Fee
                           Charge


First Gov. Money Market       N/A              N/A               N/A



Class B                                              Maximum Class B
Contingent Deferred Sales Charge                     12b-1 Fee
CDSC of original Class B
Fund purchased is applied upon redemption from          1.00%
      Class B of First Government Money Market

Conversion period of original Class B Fund
 purchased is applied



February 1998
 






                             DISTRIBUTION AGREEMENT


         This DISTRIBUTION AGREEMENT, dated as of February __, 1998 by and
between EACH CALVERT FUND LISTED IN THE SCHEDULE OF FUNDS ATTACHED HERETO AS
SCHEDULE I (each a "Fund" and together the "Funds"), as such schedule may,
from time to time be amended, and CALVERT DISTRIBUTORS, INC., a Delaware
corporation (the "Distributor").

         WHEREAS, each Fund is registered as an open-end investment company
under the Investment Company Act of 1940 (the "1940 Act") and has registered
its shares, including shares of its series portfolios (the "Series"), for sale
to the public under the Securities Act of 1933 (the "1933 Act") and various
state securities laws;

         WHEREAS, each Fund wishes to retain the Distributor as the principal
underwriter in connection with the offer and sale of shares of the Series (the
"Shares") and to furnish certain other services to the Series as specified in
this Agreement;

         WHEREAS, this contract has been approved by the Trustees/Directors of
each Fund in anticipation of the Distributor's transfer of its rights to
receive the Class B Distribution Fees ( as defined in the Distribution Plan
for Class B and C Shares (the "Distribution Plan")) and/or Class B contingent
deferred sales charges to a financing party in order to raise funds to cover
distribution expenditures; and

         WHEREAS, the Distributor is willing to act as principal underwriter
and to furnish such services on the terms and conditions hereinafter set forth;

         NOW, THEREFORE, in consideration of the promises and mutual covenants
herein contained, it is agreed as follows:


<PAGE>



                                      -9-

         1.       Each Fund hereby appoints the Distributor as principal
underwriter in connection with the offer and sale of its Shares.  The
Distributor shall, as agent for each Fund, subject to applicable federal and
state law and the Declaration of Trust or Articles of Incorporation, and
By-laws of the applicable Fund and in accordance with the representations in
the applicable Fund's Registration Statement and Prospectus, as such documents
may be amended from time to time:  (a) promote the Series; (b) enter into
appropriate dealer agreements with other registered broker-dealers to further
distribution of the Shares; (c) solicit orders for the purchase of the Shares
subject to such terms and conditions as the applicable Fund may specify; (d)
transmit promptly orders and payments for the purchase of Shares and orders
for redemption of Shares to the applicable Fund's transfer agent; and (e)
provide services agreed upon by the applicable Fund to Series shareholders;
provided, however, that the Distributor may sell no Shares pursuant to this
Agreement until the Distributor is notified that a Fund's Registration
Statement under the 1933 Act, authorizing the sale of such Shares through the
Distributor, has become effective.   The Distributor shall comply with all
applicable federal and state laws and offer the Shares on an agency or "best
efforts" basis under which a Fund shall only issue such Shares as are actually
sold.

         2.       The public offering price of the Shares shall be the net
asset value ("NAV") per share (as determined by the applicable Fund) of the
outstanding Shares of the Series, plus the applicable sales charge, if any, as
set forth in the Fund's then current Prospectus.  Each Fund shall furnish the
Distributor with a statement of each computation of NAV and of the details
entering into such computation.

         3.       Compensation.

         a.       Distribution Fee.

         i.  Class A. In consideration of the Distributor's services as
distributor for the Class A Shares of a Fund, each Fund may pay to the
Distributor the Distribution Fee as set forth in Schedule II to this Agreement
that is payable pursuant to the Fund's Distribution Plan.

         ii.  Class B.  In consideration of the Distributor's services as
distributor for the Class B Shares of a Fund, each Fund shall pay to the
Distributor (or its designee or transferee) the Distributor's Allocable
Portion of the Distribution Fee; (as set forth in Schedule II to this
Agreement) that is payable pursuant to the Fund's Distribution Plan in respect
of the Class B Shares of a Fund.  For purposes of this Agreement, the
Distributor's "Allocable Portion" of the Distribution Fee shall be 100% of
such Distribution Fee unless or until the Fund uses a principal underwriter
other than the Distributor and thereafter the Allocable Portion shall be the
portion of the Distribution Fee attributable to (i) Class B Shares of a Fund
sold by the Distributor ("Commission Shares"), (ii) Class B Shares of the Fund
issued in connection with the exchange of Commission Shares of another Fund,
and (iii) Class B Shares of the Fund issued in connection with the
reinvestment of dividends and capital gains.

         The Distributor's Allocable Portion of the Distribution Fee and the
contingent deferred sales charges arising in respect of Class B Shares taken
into account in computing the Distributor's Allocable Portion shall be limited
under Rule 2830 of the Conduct Rules or other applicable regulations of the
NASD as if the Class B Shares taken into account in computing the
Distributor's Allocable Portion themselves constituted a separate class of
shares of a Fund.

         The services rendered by the Distributor for which the Distributor is
entitled to receive the  Distributor's Allocable Portion of the Distribution
Fee shall be deemed to have been completed at the time of the initial purchase
of the Commission Shares (whether of the Fund or another Fund in the Calvert
Group of Funds) taken into account in computing the Distributor's Allocable
Portion.  Notwithstanding anything to the contrary in this Agreement, the
Distributor shall be paid its Allocable Portion of the Distribution Fee
notwithstanding the Distributor's termination as principal underwriter of the
Class B Shares of a Fund, or any termination of this Agreement other than in
connection with a Complete Termination (as defined in the Distribution Plan)
of the Class B Distribution Plan as in effect on the date of this Agreement.
Except as provided in the preceding sentence, a Fund's obligation to pay the
Distribution Fee to the Distributor shall be absolute and unconditional and
shall not be subject to any dispute, offset, counterclaim or defense
whatsoever, (it being understood that nothing in this sentence shall be deemed
a waiver by a Fund of its right separately to pursue any claims it may have
against the Distributor and to enforce such claims against any assets (other
than its rights to be paid its Allocable Portion of the Distribution Fee and
to be paid the contingent deferred sales charges) of the Distributor.

         iii.  Class C.  In consideration of the Distributor's services as
distributor for the Class C Shares of a Fund, each Fund shall pay to the
Distributor the Distribution Fee as set forth in Schedule II to this Agreement
that is payable pursuant to the Fund's Distribution Plan.

         b.       Service Fee.  As additional compensation, for Class A, Class
B and Class C Shares of each Series, applicable Funds shall pay the
Distributor a service fee (as that term is defined by the National Association
of Securities Dealers, Inc. ("NASD")) as set forth in Schedule III to this
Agreement that is payable pursuant to the Fund's Distribution Plan.

         c.       Front-end Sales Charges.  As additional compensation for the
services performed and the expenses assumed by the Distributor under this
Agreement, the Distributor may, in conformity with the terms and conditions
set forth in the then current Prospectus of each Fund, impose and retain for
its own account the amount of the front-end sales charge, if any, and may
reallow a portion of any front-end sales charge to other broker-dealers, all
in accordance with NASD rules.

         d.       Contingent Deferred Sales Charge.  Each Fund will pay to the
Distributor (or its designee or transferee) in addition to the fees set forth
in Section 3 hereof any contingent deferred sales charge imposed on
redemptions of that Fund's Class B and Class C Shares upon the terms and
conditions set forth in the then current Prospectus of that Fund.
Notwithstanding anything to the contrary in this Agreement, the Distributor
shall be paid such contingent deferred sales charges in respect of Class B
Shares taken into account in computing the Distributor's Allocable Portion of
the Distribution Fee notwithstanding the Distributor's termination as
principal underwriter of the Class B shares of a Fund or any termination of
this Agreement other than in connection with a Complete Termination of the
Class B Distribution Plan as in effect on the date of this Agreement.  Except
as provided in the preceding sentence, a Fund's obligation to remit such
contingent deferred sales charges to the Distributor shall not be subject to
any dispute, offset, counterclaim or defense whatsoever, it being understood
that nothing in this sentence shall be deemed a waiver by a Fund of its right
separately to pursue any claims it may have against the Distributor and to
enforce such claims against any assets (other than the Distributor's right to
be paid its Allocable Portion of the Distribution Fee and to be paid the
contingent deferred sales charges) of the Distributor.  No Fund will waive any
contingent deferred sales charge except under the circumstances set forth in
the Fund's current Prospectus without the consent of the Distributor (or, if
rights to payment have been transferred, the transferee), which consent shall
not be unreasonably withheld.

         4.       Payments to Distributor's Transferees.  The Distributor may
transfer the right to payments hereunder (but not its obligations hereunder)
in order to raise funds to cover distribution expenditures, and any such
transfer shall be effective upon written notice from the Distributor to the
Fund.  In connection with the foregoing, the Fund is authorized to pay all or
a part of the Distribution Fee and/or contingent deferred sales charges in
respect of Class B Shares directly to such transferee as directed by the
Distributor.

         5.       Changes in Computation of Fee, etc.  As long as the Class B
Distribution Plan is in effect, a Fund shall not change the manner in which
the Class B Distribution Fee is computed (except as may be required by a
change in applicable law or a change in accounting policy adopted by the
Investment Companies Committee of the AICPA and approved by FASB that results
in a determination by a Fund's independent accountants that any of the sales
charges in respect of such Fund, which are not contingent deferred sales
charges and which are not yet due and payable, must be accounted for by such
Fund as a liability in accordance with GAAP).

         6.       As used in this Agreement, the term "Registration Statement"
shall mean the registration statement most recently filed by a Fund with the
Securities and Exchange Commission and effective under the 1933 Act, as such
Registration Statement is amended by any amendments thereto at the time in
effect, and the term "Prospectus" shall mean the form of prospectus filed by a
Fund as part of the Registration Statement.

         7.       The Distributor shall print and distribute to prospective
investors Prospectuses, and may print and distribute such other sales
literature, reports, forms, and advertisements in connection with the sale of
the Shares as comply with the applicable provisions of federal and state law.
In connection with such sales and offers of sale, the Distributor shall give
only such information and make only such statements or representations, and
require broker-dealers with whom it enters into dealer agreements to give only
such information and make only such statements or representations, as are
contained in the Prospectus or in information furnished in writing to the
Distributor by a Fund.  The Funds shall not be responsible in any way for any
other information, statements or representations given or made by the
Distributor, other broker-dealers, or the representatives or agents of the
Distributor or such broker-dealers.  Except as specifically permitted under
the Distribution Plan under Rule 12b-1 under the 1940 Act, as provided in
paragraph 3 of this Agreement, the Funds shall bear none of the expenses of
the Distributor in connection with its offer and sale of the Shares.

         8.       Each Fund agrees at its own expense to register the Shares
with the Securities and Exchange Commission, state and other regulatory
bodies, and to prepare and file from time to time such Prospectuses,
amendments, reports and other documents as may be necessary to maintain the
Registration Statement.  Each Fund shall bear all expenses related to
preparing and typesetting its Prospectus(es) and other materials required by
law and such other expenses, including printing and mailing expenses related
to the Fund's communications with persons who are shareholders of such Fund.

         9.       Each Fund agrees to indemnify, defend and hold the
Distributor, its several officers and directors, and any person who controls
the Distributor within the meaning of Section 15 of the 1933 Act, free and
harmless from and against any and all claims, demands, liabilities and
expenses (including the cost of investigating or defending such claims,
demands or liabilities and any counsel fees incurred in connection therewith)
which the Distributor, its officers or directors, or any such controlling
person may incur, under the 1933 Act or under common law or otherwise, arising
out of or based upon any alleged untrue statement of a material fact contained
in its Registration Statement or Prospectus or arising out of or based upon
any alleged omission to state a material fact required to be stated in either
thereof or necessary to make the statements in either thereof not misleading,
provided that in no event shall anything contained in this Agreement be
construed so as to protect the Distributor against any liability to a Fund or
its shareholders to which the Distributor would otherwise be subject by reason
of willful misfeasance, bad faith, or gross negligence, in the performance of
its duties, or by reason of its reckless disregard of its obligations and
duties under this Agreement.

         10.      The Distributor agrees to indemnify, defend and hold each
Fund, their several officers and directors, and any person who controls a Fund
within the meaning of Section 15 of the 1933 Act, free and harmless from and
against any and all claims, demands, liabilities and expenses (including the
cost of investigating or defending such claims, demands or liabilities and any
counsel fees incurred in connection therewith) which a Fund, its officers or
directors, or any such controlling person may incur, under the 1933 Act or
under common law or otherwise, arising out of or based upon any alleged untrue
statement or a material fact contained in information furnished in writing by
the Distributor to the Funds for use in the Registration Statement or
Prospectus(es) or arising out of or based upon any alleged omission to state a
material fact in connection with such information required to be stated in the
Registration Statement or Prospectus(es) or necessary to make such information
not misleading.

         11.      Each Fund reserves the right at any time to withdraw all
offerings of the Shares by written notice to the Distributor at its principal
office.

         12.       The Distributor is an independent contractor and shall be
agent for a Fund only in respect to the offer, sale and redemption of that
Fund's Shares.

         13.      The services of the Distributor to a Fund under this
Agreement are not to be deemed exclusive, and the Distributor shall be free to
render similar services or other services to others so long as its services
hereunder are not impaired thereby.

         14.      The Distributor acknowledges that it has received notice of
and accepts the limitations upon the liability of any Fund organized as a
business trust set forth in such Fund's Declaration of Trust.  The Distributor
agrees that the obligations of such Funds hereunder in any case shall be
limited to such Funds and to their assets and that the Distributor shall not
seek satisfaction of any such obligation from the shareholders of such a Fund
nor from any Trustee, officer, employee or agent of such Fund.

         15.      The Funds shall not use the name of the Distributor in any
Prospectus, sales literature or other material relating to the Funds in any
manner not approved prior thereto by the Distributor; provided, however, that
the Distributor shall approve all uses of its name which merely refer in
accurate terms to its appointment hereunder or which are required by the
Securities and Exchange Commission or a State Securities Commission; and,
provided further, that in no event shall such approval be unreasonably
withheld.  The Distributor shall not use the name of any Fund in any material
relating to the Distributor in any manner not approved prior thereto by the
Fund; provided, however that the Funds shall approve all uses of their names
which merely refer in accurate terms to the appointment of the Distributor
hereunder or which are required by the Securities and Exchange Commission  or
a State Securities Commission; and, provided further, that in no event shall
such approval be unreasonably withheld.

         16.      The Distributor shall prepare written reports for the Board
of Trustees/Directors of each Fund on a quarterly basis showing information
concerning services provided and expenses incurred which are related to this
Agreement and such other information as from time to time shall be reasonably
requested by a Fund's Board of Trustees/Directors.

         17.      As used in this Agreement, the terms "assignment,"
"interested person," and "majority of the outstanding voting securities" shall
have the meaning given to them by Section 2(a) of the 1940 Act, subject to
such exemptions as may be granted by the Securities and Exchange Commission by
any rule, regulation or order; provided, however that, in order to obtain
financing, the Distributor may assign to a lending institution the payments
due to the Distributor under this Agreement without it constituting an
assignment of the Agreement.

         18.      Subject to the provisions of sections 19 and 20 below, this
Agreement will remain in effect for two years from the date of is execution
and from year to year thereafter, provided that the Distributor does not
notify a Fund in writing at least sixty (60) days prior to the expiration date
in any year that it does not wish continuance of the Agreement as to such Fund
for an additional year.

         19.      Termination.  As to any particular Fund (or Series thereof),
this Agreement shall automatically terminate in the event of its assignment
and may be terminated at any time without the payment of any penalty by a Fund
or by the Distributor on sixty (60) days' written notice to the other party.
A Fund may effect such termination by a vote of (i) a majority of the Board of
Trustees/Directors of the Fund, (ii) a majority of the Trustees/Directors who
are not interested persons of the Fund, who are not parties to this Agreement
or interested persons of such parties, and who have no direct or indirect
financial interest in the operation of the Distribution Plan, in this
Agreement or in any agreement related to such Fund's Distribution Plan (the
"Rule 12b-1 Trustees/Directors"), or (iii) a majority of the outstanding
voting securities of the relevant Series.

         20.      This Agreement shall be submitted for renewal to the Board
of Trustees/Directors of each Fund at least annually and shall continue in
effect only so long as specifically approved at least annually (i) by a
majority vote of the Fund's Board of Trustees/Directors, and (ii) by the vote
of the majority of the Rule 12b-1 Trustees/Directors of the Fund, cast in
person at a meeting called for the purpose of voting on such approval.

         IN WITNESS WHEREOF,  the parties hereto have caused this Agreement to
be executed on the date first above written by their officers thereunto duly
authorized.


Attest:                             EACH FUND LISTED IN THE
                                    ATTACHED SCHEDULE I


By:_________________________        By:__________________________


Attest:                             CALVERT DISTRIBUTORS, INC.


By:__________________________By:__________________________





 

<PAGE>

                                   SCHEDULE I


The Calvert Fund

Calvert Tax-Free Reserves

Calvert Municipal Fund

Calvert Social Investment Fund

Calvert World Values Fund

Calvert New World Fund

First Variable Rate Fund


<PAGE>

                                  SCHEDULE II

Fees are expressed as a percentage of average annual daily net assets, and are
payable monthly.

                                            Distribution Fee
                                         Class A*   Class B  Class C  Class I
The Calvert Fund
         New Vision Small Cap Fund          N/A      0.75     0.75     N/A
         Calvert Income Fund                0.25     0.75     0.75     N/A

Calvert Tax-Free Reserves
         Money Market Portfolio             N/A      N/A      N/A      N/A
     Limited-Term Portfolio                 N/A      N/A      N/A      N/A
         Long-Term Portfolio                0.10     0.75     0.75     N/A
     California Money Market Port.          N/A      N/A      N/A      N/A
     Vermont Municipal                      N/A      0.75     0.75     N/A

Calvert Municipal Fund
         National Intermediate Fund         N/A     0.75     N/A      N/A
         California Intermediate Fund       N/A     0.75     N/A      N/A
         Maryland Intermediate Fund         N/A     0.75     N/A      N/A
         Virginia Intermediate Fund         N/A     0.75     N/A      N/A

Calvert Social Investment Fund
         Managed Growth Portfolio           0.10     0.75     0.75     N/A
         Equity Portfolio                   0.10     0.75     0.75     N/A
         Bond Portfolio                     0.10     0.75     0.75     N/A
         Managed Index Portfolio            N/A      0.75     0.75     N/A
         Money Market Portfolio             N/A      N/A      N/A      N/A

Calvert World Values Fund
         Capital Accumulation Fund          0.10     0.75     0.75     N/A
         International Equity Fund          N/A      0.75     0.75     N/A

Calvert New World Fund
         Calvert New Africa Fund            N/A      0.75     0.75     N/A

First Variable Rate Fund
         Calvert First Government
         Money Market                       N/A      0.75     N/A      N/A

         * Distribution reserves the right to waive all or a portion of the
distribution fee from time to time.

DATED:  February 1998
<PAGE>


                                  SCHEDULE III

Fees are expressed as a percentage of average annual daily net assets and are
payable monthly.

                                                     Service Fee

                                           Class A* Class B   Class C  Class I
The Calvert Fund
         New Vision Small Cap Fund          0.25     0.25     0.25     N/A
         Calvert Income Fund                0.25     0.25     0.25     N/A

Calvert Tax-Free Reserves
         Money Market Portfolio             N/A      N/A      N/A      N/A
     Limited-Term Portfolio                 N/A      N/A      N/A      N/A
         Long-Term Portfolio                0.25     0.25     0.25     N/A
     California Money Market Port.          N/A      N/A      N/A      N/A
     Vermont Municipal                      N/A      0.25     0.25     N/A

Calvert Municipal Fund
         National Intermediate Fund         0.25     0.25     N/A      N/A
         California Intermediate Fund       0.25     0.25     N/A      N/A
         Maryland Intermediate Fund         0.25     0.25     N/A      N/A
         Virginia Intermediate Fund         0.25     0.25     N/A      N/A

Calvert Social Investment Fund
         Managed Growth Portfolio           0.25     0.25     0.25     N/A
         Equity Portfolio                   0.25     0.25     0.25     N/A
         Bond Portfolio                     0.25     0.25     0.25     N/A
         Managed Index Portfolio            0.25     0.25     0.25     N/A
         Money Market Portfolio             0.25     N/A      N/A      N/A


Calvert World Values Fund
         Capital Accumulation Fund          0.25     0.25     0.25     N/A
         International Equity Fund          0.25     0.25     0.25     N/A

Calvert New World Fund
         Calvert New Africa Fund            0.25     0.25     0.25     N/A

First Variable Rate Fund
         Calvert First Government
         Money Market                       N/A      0.25     N/A      N/A

DATED:  February 1998


- --------
*   Distributor reserves the right to waive all or a portion of the service
fees from time to time.  For money market portfolios, Class A shall refer to
Class O, or if the portfolio does not have multiple classes, then to the
portfolio itself.



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