CALVERT SOCIAL INVESTMENT FUND
N-14, 1998-09-03
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                                         SCHEDULE 14A INFORMATION
 
                                PROXY STATEMENT PURSUANT TO SECTION 14(a)
                                  OF THE SECURITIES EXCHANGE ACT OF 1934


                 Filed by the Registrant                      [X]

                 Filed by a Party other than the Registrant   [  ]

Check the appropriate box:
 
  [X]   Preliminary Proxy Statement
 [  ]   Confidential, for Use of the Commission Only (as permitted by
        Rule 14a-6(e)(2))
 
 [  ]   Definitive Proxy Statement
 
 [  ]   Definitive Additional Materials
 
 [  ]   Soliciting Material Pursuant to Sec. 240.14a-11(c) or Sec. 240.14a-12

                                      Calvert Social Investment Fund
                                             Equity Portfolio
                             (Name of Registrant as Specified in Its Charter)

                                        William M. Tartikoff, Esq.
                                                Secretary
                                 (Name of Person Filing Proxy Statement)


Payment of Filing Fee (Check the appropriate box):

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         (1)   Title of each class of securities to which transaction applies:
         (2)   Aggregate number of securities to which transaction applies:
         (3)   Per unit price or other underlying value of transaction computed
         (4)    pursuant to Exchange Act Rule 0-11:
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     0-11(a) (2) and identify the filing for which the offsetting fee was paid
     previously. Identify previous filing by statement number, or the Form or 
     Schedule and the date its filing.

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<PAGE>


                               September __, 1998


Dear Shareholder:
 
I am writing to inform you of the upcoming special meeting of shareholders of
the Calvert Social Investment Fund Equity Portfolio and to request that you
take a few minutes to read the enclosed material and mail back the proxy
voting card.

You are being asked to vote on several important matters affecting the Equity
Portfolio. The Board of Trustees, including myself, believes these changes are
in the Equity Portfolio's and your best interest.

Each of these items is briefly discussed below, but is explained in greater
detail in the enclosed Proxy Statement:

        Question 1 asks shareholders to approve a new investment advisory
        agreement between the Equity Portfolio and the investment advisor,
        Calvert Asset Management Company, Inc. (the "Advisor").  This
        agreement is identical to the current investment advisory agreement
        except that it does not provide for a performance adjustment to the fee.

         Question 2 asks shareholders to approve a new investment subadvisory
         agreement with the new investment subadvisor, Atlanta Capital
         Management Company, L.L.C..  Otherwise, this agreement is identical to
         the currenT investment subadvisory agreement in all material respects
         except that it also reflects a different fee and does not provide for
         a performance adjustment to the fee.
        

         Question 3 asks shareholders to approve amended fundamental
         investment restrictions to (a) change those that are no longer 
         required to be fundamental to non-fundamental operating policies,
         and (b) revise the language of those that are still required to be
         fundamental.

         Question 4 asks shareholders to authorize the Fund and the Advisor 
         to enter into a new and/or amend an existing investment subadvisory
         agreement in the future without having to obtain shareholder approval
         first.

Regardless of the number of shares you own, it is important that you take the
time to read the enclosed proxy, and complete and mail your voting card as
soon as you can.  A postage paid envelope is enclosed. If shareholders do not
return their proxies, the Equity Portfolio may have to incur the expense of
additional solicitations.  All shareholders benefit from the speedy return of
proxies.

I appreciate the time you will take to review this important matter.  If we
may be of any assistance, please call us at 1-800-368-2750.


Sincerely,

/s/ Barbara J. Krumsiek
Barbara J. Krumsiek
Trustee and Senior Vice President


<PAGE>

               Calvert Social Investment Fund Equity Portfolio
                      4550 Montgomery Avenue, Suite 1000N
                            Bethesda, Maryland 20814


                   NOTICE OF SPECIAL MEETING OF SHAREHOLDERS
                        To be held on November __, 1998

NOTICE IS HEREBY GIVEN that the Special Meeting of Shareholders of the Calvert
Social Investment Fund Equity Portfolio will be held in the Tenth Floor
Conference Room of Calvert Group, Ltd., Air Rights North Tower, 4550
Montgomery Avenue, Suite 1000N, Bethesda, Maryland at 9:00 a.m. on [DAY,
November __, 1998] for the following purposes:

I.    To approve a new investment advisory agreement with the investment
      advisor, Calvert Asset Management Company, Inc., identical to the
      current investment advisory agreement in all material respects, except
      that it does notprovide for a performance adjustment to the fee.

II.  To approve a new investment subadvisory agreement with the new
     investment subadvisor, Atlanta Capital Management Company, L.L.C.,
     otherwise identical to the current investment subadvisory agreement in
     all material respects, except that it also reflects a different fee
     and does not provide for a performance adjustment to the fee.

III.  To approve amended fundamental investment restrictions to: (a) change
      those that are no longer required to be fundamental to non-fundamental
      operating policies and (b) revise the language of those that are still
      required to be fundamental.

IV.   To authorize Calvert Social Investment Fund and Calvert Asset Management
      Company, Inc. to enter into a new and/or materially amending an existing
      investment subadvisory agreement in the future without having to obtain 
      shareholder aproval first.

V.   To transact any other business that may properly come before the Special
     Meeting or any adjournment or adjournments thereof.

Shareholders of record at the close of business on September __, 1998 are
entitled to notice of and to vote at this Special Meeting or any adjournment
thereof.


                                                     By Order of the Trustees,


                                                     William M. Tartikoff, Esq.
                                                     Vice President and
                                                     Assistant Secretary


September __, 1998

Please execute the enclosed proxy and return it promptly in the enclosed
envelope, thus enabling the Equity Portfolio to avoid unnecessary expense and
delay. Your vote is extremely important, no matter how large or small your
holdings may be. No postage is required if mailed in the United States. The
proxy is revocable and will not affect your right to vote in person if you
attend the Special Meeting.


<PAGE>

               IMPORTANT NOTICE TO CALVERT SOCIAL INVESTMENT FUND
                         EQUITY PORTFOLIO SHAREHOLDERS

                              QUESTIONS & ANSWERS

Please read the complete text of the enclosed Proxy Statement. For your
convenience, we have provided a brief overview of the matters to be voted
upon. Your vote is important. If you have any questions regarding the
proposal, please call us at 800-368-2745. We appreciate your investing with
Calvert Group, and look forward to a continuing relationship.

Q.     Why am I receiving a proxy statement?

A.     The primary reason is that the Calvert Social Investment Fund is 
       seeking your approval for the selection of a new subadvisor for the 
       Equity Portfolio.

Q.     What does the selection of a new subadvisor entail ?

A.     Changing the subadvisor will result in a change in the day-to-day
       investment management of the Equity Portfolio. The selection of a new
       subadvisor requires the execution of a new investment subadvisory
       agreement. This new agreement is identical to the agreement with the 
       current subadvisor in all material respects, except that it has a 
       different base fee and it does not provide for a performance fee.

       Similarly, a new investment advisory agreement is being proposed to
       eliminate the performance fee payable to the investment advisor.

Q.     How exactly do the proposed expense structure and advisory fees differ
       from the current ones?

A.     The same expense structure and fees would be in effect for the Equity
       Portfolio except that the investment advisory fee would eliminate the
       performance fee adjustment and the investment subadvisory fee (paid by
       the Advisor, not the Equity Portfolio) would change from 0.25% of the
       average daily net assets of the Equity Portfolio to 0.30% and would also
       eliminate the performance fee adjustment of up to an additional 0.20%).

Q.     Specifically why is the performance fee adjustment being eliminated?

A.     After much consideration, Management has determined that performance 
       fees do not accomplish their goals of providing additional incentive for
       performance. In fact, performance fees are generally not very popular in
       the mutual fund arena. It is after coming to these realizations that
       Management decided it may be best to eliminate the performance fee
       adjustment and adopt a flat fee for compensating managers.

Q.     Who is the new proposed fund manager?

A.     The new proposed subadvisor is Atlanta Capital Management Company, 
       L.L.C., with principal offices at Two Midtown Plaza, Suite 1600, 1360
       Peachtree Street, Atlanta, Georgia  30309. Atlanta Capital, founded in 
       1969, performs investment management services for various clients,
       including pension, profit sharing and other employee benefit plans as
       well as other mutual funds, institutions and individuals.

Q.     How is this change anticipated to benefit shareholders?

A.     The Board expects that the proposed change in subadvisor will allow the
       Equity Portfolio to better seek to achieve its objective of growth
       of capital.

Q.     Will the selection of a new subadvisor change the existing relationship
       between the Fund and its investment advisor, Calvert Asset Management
       Co., Inc.?

A.     The selection of a new subadvisor will not change the Fund's existing
       relationship with the Advisor, nor the terms of the governing
       investment advisory agreement, except that the Fund is proposing to
       eliminate the performance fee, which requires a new investment advisory
       agreement.

Q.     Why  are investment restrictions being amended?

A.     The  fundamental investment restrictions for the Equity Portfolio are
       proposed to be amended because several of the restrictions are no longer
       required to be fundamental restrictions due to changes in the regulatory
       landscape. However, these restrictions are proposed to continue as
       non-fundamental operating policies.  Similarly, certain of these
       investment restrictions are still required to be fundamental restrictions
       and are being revised to more clearly state the applicable restriction. 
       These restrictions cannot be amended without shareholder approval, and
       therefore, these proposed amendments are being submitted for your 
       approval.

Q.     What  if there are not enough votes to reach a quorum by the scheduled
       special meeting date?

A.     If  enough shareholders do not vote, we will need to take further
       action. We or our outside solicitors, D.F. King & Co., may contact you
       by mail, telephone, facsimile, or by personal interview. Therefore, we
       encourage you to vote as soon as you review the enclosed proxy
       materials in order to avoid additional mailings, telephone calls or
       other solicitations.

Q.     How do the trustees of the Fund suggest that I vote?

A.     After careful consideration, the Trustees of the Fund
       unanimously recommend that you vote "FOR" each of the items proposed on
       the enclosed proxy card.

Q.     Will my vote make a difference?

A.     Your vote is needed to ensure that the proposals can be acted upon.
       Your immediate response on the enclosed proxy card will help save on
       the costs of any further solicitations for a shareholder vote. We
       encourage all shareholders to participate in the governance of the
       Equity Portfolio.

Q.     How do I vote my shares?

A.     You can vote your shares by completing and signing the enclosed proxy
       card, and mailing it in the enclosed postage paid envelope. You may
       also vote by telephone, e-mail, our internet website, or in person. If
       you need any assistance, or have any questions regarding the proposal
       or how to vote your shares, please call us at (800) 368-2745.

Q.     How do I sign the proxy card?

A.     Proxy cards must be executed properly. When proxy cards are not
       signed as required by law, you and the Fund must undertake the time and
       expense to take steps to validate your vote. The following guide explains
       the proper format for signing your proxy card:

     1.   Individual Accounts: Your name should be signed exactly as it
         appears in the registration on the proxy card.

     2.   Joint Accounts: Either party may sign, but the name of the party
         signing should conform exactly to a name shown in the registration.

     3.   All other accounts should show the capacity of the individual
         signing. This can be shown either in the form of the account
         registration itself or by the individual executing the proxy card.

       Voting by mail is quick and easy. Everything you need is enclosed.

<PAGE>

                        Calvert Social Investment Fund
                                Equity Portfolio

                      4550 Montgomery Avenue, Suite 1000N
                            Bethesda, Maryland 20814


                                PROXY STATEMENT

                               September __, 1998

This statement is furnished in connection with the solicitation of proxies by
the Board of Trustees of the Calvert Social Investment Fund (the "Fund") to be
used at the Special Meeting of Shareholders of the Equity Portfolio. The
Special Meeting will be held in the Tenth Floor Conference Room of Calvert
Group, Ltd., Air Rights North Tower, 4550 Montgomery Avenue, Suite 1000N,
Bethesda, Maryland at 9:00 a.m. on [DAY, November __, 1998], or at such later
time or date made necessary by adjournment for the purpose set forth in the
Notice of Meeting.

The Equity Portfolio is a series of the Calvert Social Investment Fund, an
open-end management investment company that was organized as a Massachusetts
business trust on December 14, 1981.

Calvert Asset Management Company, Inc. (the "Advisor" or "CAMCO") serves as
investment advisor to the Fund and to several other registered investment
companies in the Calvert Group Family of Funds. Calvert Distributors, Inc.
("CDI") serves as the principal underwriter to the Fund. Calvert
Administrative Services Company ("CASC") has been retained by the Fund to
provide certain administrative services necessary to the conduct of its
affairs. CAMCO, CDI and CASC are located at 4550 Montgomery Avenue, Suite
1000N, Bethesda, Maryland, 20814, and are indirectly wholly owned subsidiaries
of Acacia Mutual Life Insurance Company.

By this proxy statement, the Fund seeks shareholder approval of new investment
advisory and subadvisory agreements which are identical to the current
agreements in all material respects, except that the proposed agreements do not
provide for performance fees and further, the proposed subadvisory agreement
provides for a higher fee to be paid by the Advisor for the subadvisor's
advisory services (but does not pay a fee for any marketing assistance).
The Fund also seeks shareholder approval of an arrangement approved by the
Securities and Exchange Commission whereby the Fund and the Advisor would be
allowed to enter into a new and/or materially amend an existing investment 
subadvisory agreement in the future without shareholder approval. In addition,
the Fund seeks shareholder approval to amend the fundamental investment
restrictions applicable to the Equity Portfolio.


                                   PROPOSALS

I.    To approve a new investment advisory agreement with the investment
     advisor, Calvert Asset Management Company, Inc., identical to the
     current investment advisory agreement in all material respects, except that
     it does not provide for a performance fee.

The Board of Trustees has approved, and recommends that shareholders approve,
a new investment advisory agreement between CAMCO and the Fund with respect to
the Equity Portfolio. The proposed Investment Advisory Agreement (the
"Advisory Agreement") is identical to the current investment advisory agreement
in all material respects, except that it eliminates the performance adjustment
of up to anadditional 0.20% provided under the current agreement.

     The  investment  advisory  agreement with CAMCO as it relates to the Equity
Portfolio was dated as of May 24, 1994.  This  agreement was last submitted to a
vote of shareholders,  garnering approval of the current investment  subadvisor,
on May 24, 1994. At the September 15, 1998 meeting of the Board of Trustees, the
Board  determined  that  the  Fund  may  benefit  from  the  elimination  of the
performance  adjustment,  and approved a new  investment  advisory  agreement to
reflect this change to be entered into as of September 30, 1998.

     Nonetheless,   under  the  current  investment  advisory  agreement,  CAMCO
receives a fee from the Equity  Portfolio  based on a  percentage  of the Equity
Portfolio's  average  daily net assets plus or minus a  performance  adjustment.
During the fiscal year ended  September 30, 1997,  $683,046 in fees were paid to
CAMCO.

The Proposed Investment Advisory Agreement. The proposed Advisory Agreement
between the Equity Portfolio and CAMCO, reproduced in Appendix A, is under
substantially the same terms as govern the current arrangement with CAMCO,
except as described below. If approved by shareholders, the Advisory Agreement
will continue to January 1, 2000 unless terminated earlier by either party,
and will continue thereafter on an annual basis if approved by the Trustees or
shareholders and a majority of the Trustees who are not interested persons of
the Fund, Advisor or Subadvisor. Until shareholders approve the proposed
Advisory Agreement, the Equity Portfolio may compensate CAMCO pursuant to Rule
15a-4 under the Investment Company Act of 1940. However, compensation paid
during this interim period may not exceed the amount that would have been
payable to CAMCO under the prior arrangement.1 If shareholders do not
approve the proposed  Investment Advisory Agreement at the upcoming Special
Meeting  or any  adjournment,  the  Board  will  meet,  either  in  person or by
telephone, to consider re-instituting the performance adjustment.

Under the current advisory agreement, CAMCO is paid at the annual rate of 0.70%
of average daily net Assets, subject to adjustment, based on the extent to which
performance of the Equity Portfolio exceeded or trailed the Standard & Poor's
500 Composite Index:

             Performance versus                  Performance
             the S&P's 500 Composite Index       Fee Adjustment
- --------------------------------------------------------------------------------
 
             6% to < 12%                         0.07%
             12% to < 18%                        0.14%
             18% or more                         0.20%

Comparison of Advisory Fees.

Current Investment Advisory Agreement    Proposed Investment Advisory Agreement

________________________                   __________________________
0.70% on all Portfolio assets              0.70% on all Portfolio assets
and a performance adjustment
of plus/minus 0.20%

     Based on its  evaluation  of the  materials  presented  and assisted by the
advice of independent counsel, the Board of Trustees concluded that the proposed
Advisory  Agreement with CAMCO is in the best interest of the Equity Portfolio's
shareholders.  The Board of Trustees has voted to approve the Advisory Agreement
and the submission of this agreement to shareholders . Accordingly, the Board of
Trustees recommends that shareholders vote FOR the proposed Advisory Agreement.

II.   To approve a new investment subadvisory agreement with the investment
      subadvisor, Atlanta Capital Management Company, L.L.C., otherwise 
      identical to the current investment subadvisory agreement in all material
      respects, except that it reflects a different fee structure and does not
      provide for a performance fee.

The Advisor has traditionally contracted out subadvisory services for the
Equity Portfolio. Pursuant to the current investment subadvisory agreement dated
as of February 1, 1994, the Equity Portfolio's investment subadvisor has been
Loomis, Sayles & Company, L.P. ("Loomis, Sayles"),organized as a limited
partnership and controlled by New England Mutual Life Insurance Company. The
principal business address of Loomis, Sayles is One Financial Center, Boston,
Massachusetts 02111.

Under this
agreement, Loomis, Sayles receives a fee from the Advisor based on a
percentage of the Equity Portfolio's average daily net assets plus or minus a
performance adjustment. During fiscal year ended September 30, 1997, $182,267
in subadvisory fees were paid to Loomis, Sayles by CAMCO.

At the September 15, 1998 meeting of the Board of Trustees, the Board
terminated Loomis, Sayles as the subadvisor to the Equity Portfolio effective
as of September 30, 1998. In this connection, the Board determined that
shareholders may benefit from the services of a different investment
subadvisor whose management style might better achieve the Equity Portfolio's
objective of growth of capital. After careful consideration by the Advisor of
the many candidates, the Advisor recommended, and the Board selected (subject
to shareholder approval), Atlanta Capital Management Company, L.L.C. ("Atlanta
Capital") as subadvisor for the Equity Portfolio. Therefore, Atlanta Capital
will assume management responsibility for the Equity Portfolio as of September
30, 1998.

In  order  to make its  decision,  the  Board,  via  Management,  requested
information  about  Atlanta  Capital,  as  well  as  further  information  about
Management's evaluation of other potential subadvisors. Management and the Board
subsequently received and evaluated the supplied  information.  This information
included  details about the firm in general and copies of regulatory  disclosure
materials filed with the Securities and Exchange Commission. Management met with
Atlanta  Capital,  and  Atlanta  Capital  made a  presentation  to the Board and
responded to members' questions at the Board meeting.


Atlanta Capital Management, L.L.C. Atlanta Capital was founded in 1969 and is
owned and operated by six partners. Atlanta Capital is located at Two Midtown
Plaza, Suite 1600, 1360 Peachtree Street, Atlanta, Georgia  30309. As of
August 31, 1998, Atlanta Capital had approximately 3.5 billion in assets under
management. The firm performs investment management services for various
clients, including pension, profit sharing and other employee benefit plans as
well as other mutual funds, institutions and individuals.

Atlanta Capital currently provides investment subadvisory services to one other
mutual fund with an investment objective similar to that of the Equity
Portfolio:

Mutual Fund                Assets Under Management           Management Fees

PB Series Trust,
High Quality Stock Fund    $11.0 million]                   0.50% of net
assets

With respect to this mutual fund, Atlanta Capital has not waived,
reduced, or otherwise agreed to reduce its compensation under its
investment management contract.

Atlanta Capital's Investment Professionals.

Daniel W. Boone, III, CFA is a Senior Partner of Atlanta Capital.  Mr.
Boone's primary responsibilities are in equity portfolio management and
research.  Before joining Atlanta Capital in 1976, he was with the
international firm of Lazard Freres in New York. Prior to that he was an
analyst with the Wellington Management Company. Mr. Boone has earned an MBA
from the Wharton School of The University of Pennsylvania, where he graduated
with distinction, and a B.A. from Davidson College. He is a Chartered Financial
Analyst and a Chartered Investment Counselor.  Mr. Boone is a past president
of the Atlanta Society of Financial Analysts.

William R. Hackney, III, CFA is Managing Partner of Atlanta Capital.  Mr.
Hackney joined Atlanta Capital in 1995 and has responsibilities in equity
portfolio management and research as well as day-to-day administration.  Prior
to joining Atlanta Capital, he was Senior Vice President and Chief Investment
Officer of First Union Corporation's Capital Management Group. Mr. Hackney
has earned an MBA from The Citadel and a B.A. from The University of North
Carolina at Chapel Hill.

Marilyn  Robinson,  CFA is Senior Vice President and  Principal,  serves as
Director of Equity  Research and is a member of the Portfolio  Management team .
Ms.  Robinson  has 15 years  investment  experience,  nine  years  with  Atlanta
Capital.  Prior to  joining  Atlanta  Capital,  she was a Treasury  Analyst  for
Consolidated Health Care in Richmond,  Virginia.  Ms. Robinson has earned a M.S.
and B.B.A. from Georgia State University.  She is a Chartered  Financial Analyst
and  serves  on the  Board  of  Examiners  for  the  Association  of  Investment
Management and Research. She is also a Certified Cash Manager.

Atlanta Capital's Investment Strategy.

Atlanta  Capital is a large-cap, high quality growth stock manager. The firm
favors companies with superior, consistent growth in earnings and dividends,
and therefore limits holdings to stocks rated B+ or better by Standard and
Poor's Corporation.

Atlanta Capital's Partners.

                          Name of Company and                   Principal
Name                      Principal Business Address            Occupation
                                                                or Title

Daniel W. Boone, III      Atlanta Capital Management Company    Senior Partner
                          Two Midtown Plaza, Suite 1600
                          1360 Peachtree Street
                          Atlanta, Georgia  30309

Gregory L. Coleman        Atlanta Capital Management Company    Partner
                          Two Midtown Plaza, Suite 1600
                          1360 Peachtree Street
                          Atlanta, Georgia  30309

Jerry D. DeVore           Atlanta Capital Management Company Partner
                          Two Midtown Plaza, Suite 1600
                          1360 Peachtree Street
                          Atlanta, Georgia  30309

William R. Hackney, III   Atlanta Capital Management Company    Managing Partner
                          Two Midtown Plaza, Suite 1600
                          1360 Peachtree Street
                          Atlanta, Georgia  30309

Dallas Lundy             Atlanta Capital Management Company     Partner
                         Two Midtown Plaza, Suite 1600
                         1360 Peachtree Street
                         Atlanta, Georgia  30309

Walter F. Reames, Jr.    Atlanta Capital Management Company     Senior Partner
                         Two Midtown Plaza, Suite 1600
                         1360 Peachtree Street
                         Atlanta, Georgia  30309

The Proposed  Investment  Subadvisory  Agreement.  The proposed  Investment
Subadvisory  Agreement  (the  "Subadvisory  Agreement")  between the Advisor and
Atlanta Capital, reproduced in Appendix B, contains substantially the same terms
as govern the Advisor's  arrangement  with Loomis,  Sayles,  except as described
below. If approved by shareholders,  the Subadvisory  Agreement will continue to
January 1, 2000 unless  terminated  earlier by either  party,  and will continue
thereafter on an annual basis if approved by the Trustees or shareholders  and a
majority of the Trustees who are not interested  persons of the Fund, Advisor or
Subadvisor. Until shareholders approve the proposed Subadvisory Agreement, CAMCO
may  compensate  Atlanta  Capital  pursuant to Rule 15a-4  under the  Investment
Company Act of 1940.  However,  compensation paid during this interim period may
not exceed the amount that would have been  payable to Loomis,  Sayles under the
prior  arrangement.2  If  shareholders  do not approve the proposed  Subadvisory
Agreement at the upcoming  Special  Meeting or any  adjournment,  the Board will
meet,  either  in person  or by  telephone,  to  consider  what  action to take,
including  but not limited to,  seeking the services of an alternate  investment
subadvisor.


As with the arrangement between the Advisor and Loomis, Sayles, Atlanta
Capital's fee for subadvisory services will be paid by the Advisor. However,
whereas the Advisor paid Loomis, Sayles an annual fee based upon the Equity
Portfolio's average daily net assets plus or minus a performance adjustment,
the Advisor will pay Atlanta Capital a fee with no performance adjustment.
Specifically, the proposed fee schedule appended to the proposed Subadvisory
Agreement with Atlanta Capital calls for a fee, payable monthly, at the annual
rate of 0.30% of the Equity Portfolio's average daily net assets.

Under the current arrangement, Loomis, Sayles is paid a subadvisory fee at the
annual rate of 0.25% of average daily net assets and the Advisor could adjust
this fee based on the extent to which performance of the Equity Portfolio
exceeded or trailed the Standard & Poor's 500 Composite Index:

             Performance versus                  Performance
             the Relevant Index                  Fee Adjustment
- --------------------------------------------------------------------------------
 
             6% to < 12%                         0.07%
             12% to < 18%                        0.14%
             18% or more                         0.20%

Comparison of Subadvisory Fees.

             Current Investment Subadvisory     Proposed Investment
             Agreement with Loomis,              Subadvisory Agreement with
             Sayles & Company, L.P.             Atlanta Capital
                                                 Management Company, L.L.C.
             ________________________            _________________________
             0.25% on all Portfolio assets       0.30% on all Portfolio assets.
             and a performance adjustment
             of plus/minus 0.20%*

*Loomis, Sayles also received a 0.05% annual fee, paid by CAMCO, for its
assistance with the distribution of the Equity Portfolio. Atlanta Capital will
not receive such a fee.

Based on its  evaluation  of the  materials  presented  and assisted by the
advice of independent counsel, the Board of Trustees concluded that the proposed
Subadvisory Agreement with Atlanta Capital is in the best interest of the Equity
Portfolio's  shareholders  in that  they will  benefit  from the  services  of a
different investment  subadvisor whose management style might better achieve the
Equity  Portfolio's  objective  of growth of capital.  The Board of Trustees has
voted to approve the Investment Subadvisory Agreement and the submission of this
agreement to shareholders.  Accordingly,  the Board of Trustees  recommends that
shareholders vote FOR the proposed Subadvisory Agreement.


III. To approve amended fundamental investment  restrictions to: (a) change
those that are no longer required to be fundamental to non-fundamental operating
policies  and (b) revise the  language  of those that are still  required  to be
fundamental.

Since the inception of the Calvert Social  Investment Fund Equity Portfolio
in 1994, certain state laws and/or regulations are no longer applicable, leaving
the Equity Portfolio  governed by investment  policies and restrictions that are
more restrictive than is currently necessary. Accordingly,  Management has taken
the  opportunity  to provide  additional  flexibility  in the  management of the
Equity  Portfolio  and has thus  recommended  to the Board  that the  investment
policies and  restrictions of the Equity Portfolio be amended . This is expected
to enhance the subadvisor's ability to manage the Equity Portfolio in a changing
investment environment and will increase investment management opportunities.

The fundamental  investment  restrictions of the Equity Portfolio,  as they
read now, are  reproduced in Appendix C. After careful  consideration,  and upon
the  advice of  outside  counsel,  the Board  approved  changing  the  following
fundamental investment restrictions to non-fundamental operating policies of the
Equity Portfolio, subject to shareholder approval:

     1.  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% the value of that Portfolio's  total assets would
be invested in securities of that issuer. [PRIOR FUNDAMENTAL RESTRICTION #1]

     2.  Purchase  more than 10% of the  outstanding  voting  securities  of any
issuer. In addition, the Fund may not in the aggregate purchase more than 10% of
the outstanding voting securities of any issuer. [PRIOR FUNDAMENTAL  RESTRICTION
#3]


     3.  Purchase  the  securities  of any issuer  with less than  three  years'
continuous  operation  if,  as a  result,  more  than  5% of the  value  of that
Portfolio's total assets would be invested in securities of such issuers. [PRIOR
FUNDAMENTAL RESTRICTION #4]

     4.  Purchase  from or sell to any of the Fund's  officers or  Trustees,  or
firms of which any of them are members, any securities (other than capital stock
of the Fund),  but such  persons  or firms may act as  brokers  for the Fund for
customary commissions. [PRIOR FUNDAMENTAL RESTRICTION #7]

     5. Make short sales of  securities  or purchase  any  securities  on margin
except  with  respect  to  options,  futures  contracts  and  options on futures
contracts. [PRIOR FUNDAMENTAL RESTRICTION #9]

     6. Write,  purchase or sell puts, calls or combinations thereof except with
respect to options,  futures contracts and options on futures contracts.  [PRIOR
FUNDAMENTAL RESTRICTION #10]


     7. Invest for the purpose of  exercising  control or  management of another
issuer. [PRIOR FUNDAMENTAL RESTRICTION #11]


     8.  Invest in  interests  in oil,  gas,  or other  mineral  exploration  or
development  programs,  although it may invest in  securities  of issuers  which
invest in or sponsor such programs. [PRIOR FUNDAMENTAL RESTRICTION #13]

     9. Purchase or retain securities  issued by investment  companies except to
the extent permitted by the investment  Company Act of 1940, as amended,  and in
connection  with  a  trustee's/director's  deferred  compensation  plan.  [PRIOR
FUNDAMENTAL RESTRICTION #14]

Further,  after  careful  consideration,  and upon the  advice  of  outside
counsel,  the Board approved revising the language of the remaining  fundamental
investment restrictions, subject to shareholder approval:

Proposed Revised Fundamental Investment Restrictions.

The  Equity Portfolio may not:

1.    Borrow  money,  except  from  banks for  temporary  or  emergency
     purposes,  and then only in an amount not to exceed  one-third  of
     the Fund's  total  assets,  or as  permitted by law. The Fund will
     not  make  purchases  while  its  borrowings  exceed  5% of  total
     assets.  In order to secure any  permitted  borrowings  under this
     section, the Fund may pledge, mortgage or hypothecate its assets.
2.    Issue senior  securities  or underwrite  the  securities of other
     issuers,  except  as  permitted  by the Board of  Trustees  within
     applicable  law, and except to the extent that in connection  with
     the  disposition  of its  portfolio  securities,  the  Fund may be
     deemed to be an underwriter.
3.    Concentrate  more than 25% of the value of its  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, and repurchase agreements secured thereby.
4.    Invest directly in commodities,  commodity futures contracts,  or
     real  estate.  (The  Fund  may  invest  in  securities  which  are
     secured  by  real  estate  or  real  estate  mortgages,  or in the
     securities  of  issuers  which  invest  or  deal  in  commodities,
     commodity futures, real estate, or real estate mortgages and may purchase
     or sell stock index futures, foreign currency futures, interest rate
     futures and options thereon.)
5.    Make loans of more than one-third of the total assets of the Fund, or as
     permitted by law, other than through the purchase of money market
     instruments and repurchase agreements or by the purchase of bonds,
     debentures or other debt securities, or the lending of portfolio
     securities as detailed in the Prospectus, or as permitted by law. The
     purchase by the Fund of all or a portion of an issue of publicly or
     privately distributed debt obligations in accordance with its investment
     objective, policies and restrictions, shall not constitute the making of
     a loan.

The Board of Trustees has voted to approve these amended fundamental
investment restrictions for the Equity Portfolio and recommends that
shareholders vote FOR the Proposal.

IV.       To authorize the Fund and the Advisor entering into a new and/or
          materially amending an existing investment subadvisory agreement in
          the future without shareholder approval.

The  Securities  and  Exchange  Commission  has issued to the Fund an order
permitting  the Fund to enter into a new and/or  materially  amend an investment
subadvisory  agreement without  shareholder  approval with respect to the Equity
Portfolio.  Management  believes that the Advisor's constant  supervision of the
subadvisor  will  permit  the  proportion  of  shareholders'  assets  subject to
particular subadvisor styles to be reallocated (or a new subadvisor  introduced)
in response to changing  market  conditions  or  subadvisor  performance,  in an
attempt to improve  the Equity  Portfolio's  overall  performance.  In  essence,
shareholder  approval of this  proposal  would  permit the Advisor to select the
subadvisor best suited to achieve the Equity Portfolio's  investment  objective.
However,  the Fund may not rely on the order until it has been authorized by the
Portfolio's shareholders to do so.

In the past, Management has found that requiring shareholder approval of a
subadvisor and investment subadvisory agreement imposed costs on the Equity
Portfolio without advancing shareholder interests. Management believes that
shareholders' interests are adequately protected by their voting rights with
respect to the investment advisory agreement and the responsibilities assumed
by the Advisor and the Fund's Board of Trustees. Further, Management
notes that it has become increasingly difficult to obtain shareholder
quorums for  shareholder  meetings.  Without  shareholder  approval of this
proposal, Management believes that the Equity Portfolio, in the future, could be
left  with  an  ineffective  subadvisor  while  awaiting  shareholder  approval.
Management  is also  concerned  that  requiring  shareholder  approval  of a new
subadvisor and/or  amendments to an existing  investment  subadvisory  agreement
would prevent the Fund from promptly and timely  employing the  subadvisor  best
suited to the needs of the Equity Portfolio.

In requesting you to authorize the Advisor and the Fund to enter into a new
or amend an existing  investment  subadvisory  agreement  with a new  subadvisor
and/or amend an existing investment  subadvisory agreement without first seeking
shareholder approval, Management is seeking to streamline the steps in the
process so that the Fund can more  efficiently  continue toward achieving
its  investment  objectives  with a  subadvisor  recommended  by the Advisor and
approved by the Board of Trustees.  Management expects that the Equity Portfolio
and its  shareholders  will  benefit  from  elimination  of the cost  and  delay
associated  with the proxy  process and the  conducting  of special  shareholder
meetings.  If the  Advisor  and the  Fund  are  authorized  to  enter  into  new
subadvisory   relationships   outside   of  the  proxy   solicitation   process,
shareholders  will  continue to benefit by knowing  that the Advisor has applied
the same safeguards and criteria in making its selection while still  fulfilling
its same duties to shareholders and to the Equity Portfolio. Although Management
would be authorized to make a subadvisory  change without a shareholder vote, as
shareholders,  you are  entitled  to and  would  continue  to  receive  the same
disclosure  and details  about the selection  process and the  background of the
newly  selected  manager as you have received in this  solicitation,  but in the
form of an information statement instead of a proxy statement.  This information
would be delivered to shareholders within 90 days of the subadvisory change.

The Information  Statement would include the same information about the new
subadvisor and the new investment  subadvisory agreement as would be included in
a proxy  statement.  In addition,  the  Prospectus  and  Statement of Additional
Information would be revised to disclose all required information  regarding the
subadvisor.  It would  include  any  change  in such  disclosure  caused  by the
addition of a new subadvisor and any proposed  material change in the investment
subadvisory agreement of the Fund.

Management  recommended  authorization  of the  ability to enter into a new
and/or  materially amend an existing  investment  subadvisory  agreement without
shareholder approval to the Board of Trustees,  and at a meeting of the Board of
Trustees  held  on  September  15,  1998,   the  Board   approved   Management's
recommendation.  For the reasons  outlined above, the Board of Trustees voted to
approve the submission of the proposal to shareholders  of the Equity  Portfolio
and recommends that shareholders vote FOR the Proposal.

                                 OTHER BUSINESS

The  Trustees of the Fund do not intend to present any other business at the
meeting. If, however, any other matters are properly brought before the
meeting, the persons named in the accompanying form of proxy will vote thereon
in accordance with their judgment.

                                 ANNUAL REPORTS

The audited Annual Report to Shareholders of the Fund is also  incorporated
by reference into this proxy statement.  Copies of the most recent Annual Report
and the most  recent  semi-annual  report  succeeding  the annual  report may be
obtained without charge by writing to the Fund at 4550 Montgomery Avenue,  Suite
1000N, Bethesda, Maryland 20814 or by calling (800) 368-2745.
                             SHAREHOLDER PROPOSALS

The  Fund is not required to hold annual shareholder meetings. Shareholders
who would like to submit proposals for consideration at future shareholder
meetings should send written proposals to the Calvert Group Legal Department,
4550 Montgomery Avenue, Suite 1000N, Bethesda, Maryland, 20814.

                               VOTING INFORMATION

Proxies are solicited by mail, but additional solicitations may be made by
telephone, computer communications, facsimile or other such means, or by
personal contact by officers or employees of Calvert Group and its affiliates
or by proxy soliciting firms retained for this purpose. The Fund will bear
solicitation costs.

A proxy may be revoked at any time before the meeting or during the meeting by
oral or written notice to William M. Tartikoff, Esq., 4550 Montgomery Avenue,
Suite 1000N, Bethesda, Maryland 20814. Unless revoked, all valid proxies will
be voted in accordance with the specification thereon or, in the absence of
specification, for approval of the proposals.

Each  proposal  must be approved by a majority of the  outstanding  shares,
which is  defined as the lesser of: (1) the vote of 67% or more of the shares of
the  Portfolio  at the  Special  Meeting if the  holders of more than 50% of the
outstanding  shares of the Portfolio  are present in person or by proxy,  or (2)
the vote of more  than  50% of the  outstanding  shares  of the  Portfolio.  All
classes of the Portfolio vote together.

Abstentions and broker non-votes will be counted as shares present for
purposes of determining whether a quorum is present but will not be voted for
or against any adjournment or proposal. (Broker non-votes are shares held in
street name for which the broker indicates that instructions have not been
received from the beneficial owners or other persons entitled to vote and the
broker does not have discretionary voting authority.) Accordingly, abstentions
and broker non-votes effectively will be a vote against adjournment or against
any proposal where the required vote is a percentage of the shares present.

Shareholders of the Equity Portfolio of record at the close of business on
September __, 1998 ("record date") are entitled to notice of and to vote at
the Special Meeting or any adjournment thereof. Shareholders are entitled to
one vote for each share held on that date. As of August 31, 1998, as shown on
the books of the Equity Portfolio, there were issued and outstanding [#]
shares of the Equity Portfolio. As of that date, the officers and Trustees of
the Equity Portfolio as a group beneficially owned less than 1% of the
outstanding shares of the Equity Portfolio. To the knowledge of the Fund, no
shareholder owned beneficially more than 5% of the outstanding shares of the
Equity Portfolio on that date.

This Proxy Statement is expected to be mailed to shareholders of record on or
about September __, 1998.

                                  ADJOURNMENT

In  the event that sufficient votes in favor of the proposals set forth in the
Notice of Meeting and Proxy Statement are not received by the time scheduled
for the meeting, the persons named as proxies may move one or more
adjournments of the meeting to permit further solicitation of proxies with
respect to any such proposals. Any such adjournment will require the
affirmative vote of a majority of the shares present at the meeting. The
persons named as proxies will vote in favor of such adjournment those shares
that they are entitled to vote which have voted in favor of such proposals.
They will vote against any such adjournment those proxies that have voted
against any such proposals.

By Order of the Board of Trustees
William M. Tartikoff, Esq.
Vice President and Assistant Secretary


The Trustees of Calvert Social Investment Fund Equity Portfolio, including the
Independent Trustees, recommend a Vote for Approval of the Proposals presented.
<PAGE>


CALVERT SOCIAL INVESTMENT FUND EQUITY PORTFOLIO
THIS PROXY IS SOLICITED BY THE BOARD OF TRUSTEES

The undersigned, revoking previous proxies, hereby appoint(s) William M.
Tartikoff, Esq. and Barbara J. Krumsiek, attorneys, with full power of
substitution, to vote all shares of the Equity Portfolio that the undersigned
is entitled to vote at the Special Meeting of Shareholders to be held in the
Tenth Floor Conference Room of Calvert Group, 4550 Montgomery Avenue, Suite
1000N, Bethesda, Maryland 20814 on [DAY, November __, 1998] at 9:00 a.m. and
at any adjournment thereof. All powers may be exercised by a majority of the
proxy holders or substitutes voting or acting or, if only one votes and acts,
then by that one. This Proxy shall be voted on the proposals described in the
Proxy Statement. Receipt of the Notice of the Meeting and the accompanying
Proxy Statement is hereby acknowledged.

NOTE: Please sign exactly as
your name appears on this
Proxy. When signing in a
fiduciary capacity, such as
executor, administrator,
trustee, guardian, etc.,
please so indicate.
Corporate and partnership
proxies should be signed by
an authorized person
indicating the person's
title.

                              Date: ________________________, 1998

                              __________________________________

                              __________________________________
                              Signature(s) (Title(s), if applicable)

PLEASE SIGN, DATE, AND RETURN
PROMPTLY IN ENCLOSED ENVELOPE

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

Please refer to the Proxy Statement discussion on this matter.

IF NO SPECIFICATION IS MADE, THE PROXY SHALL BE VOTED FOR THE PROPOSALS.

As to any other matter, said attorneys shall vote in accordance with their
best judgment.
 
THE BOARD OF TRUSTEES RECOMMENDS A VOTE FOR THE FOLLOWING:

1.        To approve a new investment advisory agreement with the investment
         advisor, Calvert Asset Management Company, Inc., identical to the
         current investment advisory agreement in all material respects, except
         that it does not provide for a performance adjustment to the fee.

         [  ] For                   [  ] Against              [  ] Abstain


2.        To approve a new investment subadvisory agreement with the
         investment subadvisor, Atlanta Capital Management Company, L.L.C.,
         otherwise identical to the current investment subadvisory agreement in
         all material respects, except that it also reflects a new fee and does
         not provide for a performance adjustment to the fee.

         [  ] For                   [  ] Against              [  ] Abstain

3. To approve amended fundamental investment restrictions to:

         (a)    Change those that are no longer required to be fundamental
                to non-fundamental operating policies.

          [  ] For                   [  ] Against              [  ] Abstain

(b) Revise the language of those that are still required to be fundamental.

         [  ] For                   [  ] Against              [  ] Abstain

4        To authorize the Fund and the Advisor to enter into a new and/or
         materially amend an existing investment subadvisory agreement in the
         future without having to obtain shareholder approval first.

         [  ] For                   [  ] Against              [  ] Abstain


[INSERT INSTRUCTIONS FOR FACSIMILE, TELEPHONE AND INTERNET VOTING]


<PAGE>

 
                                                                     APPENDIX  A


                         PROPOSED INVESTMENT ADVISORY AGREEMENT


         INVESTMENT  ADVISORY  AGREEMENT,  made this __ day of September,  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 the Schedule  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:__________________

 

               Fee Schedule to the Investment Advisory Agreement
               between Calvert Asset Management Company, Inc. and
                Calvert Social Investment Fund Equity Portfolio


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

The annual Fee shall be computed  daily and payable  monthly,  at an annual rate
of 70 basis points of the average daily net assets of the Fund.


<PAGE>

 
                                                                     APPENDIX  B


                   PROPOSED INVESTMENT SUBADVISORY AGREEMENT



         INVESTMENT  SUBADVISORY  AGREEMENT,  effective  September  __, 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  Atlanta  Capital  Management  Company,  L.L.C..,  a 
Georgia 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
                           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 or pursuant to the Fund's exemptive
order governing the requirement of such a vote.  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 this Agreement,  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:

                  (a)  the duties of the  Advisor  delegated  to the  Subadvisor
                      under   this   Agreement   with   respect   to  such  Fund
                      automatically shall revert to the Advisor, and

                  (b)  both parties agree to use  reasonable  efforts to jointly
                      issue   public   statements,   other  than  those   public
                      statements required by law, regarding the termination.

         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 be registered  as an investment  Adviser
under the Investment Advisers Act of 1940, as amended, and under the laws of any
jurisdiction  in  which  the  Subadvisor  is  required  to be  registered  as an
investment Adviser in order to perform its obligations under this Agreement;

                  (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.      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:              Atlanta Capital Management Company, L.L.C..
                      Two Midtown Plaza, Suite 1600
                      1360 Peachtree Street
                      Atlanta, GA  30309


By:_______________    By:______________


              Fee Schedule to the Investment Subadvisory Agreement
                 between Calvert Asset Management Company, Inc.
                  and Atlanta Capital Management Company, L.L.C..


     As  compensation  pursuant  to  Section  4 of  the  Investment  Subadvisory
Agreement  between Calvert Asset  Management  Company,  Inc. (the "Advisor") and
Atlanta Capital Management  Company,  L.L.C.. (the "Subadvisor") dated September
__, 1998, with respect to the Calvert Social  Investment Fund Equity  Portfolio,
the Advisor  shall pay the  Subadvisor a  subadvisory  fee,  computed  daily and
payable  monthly,  at an annual rate of 30 basis points of the average daily net
assets of the Equity Portfolio.

<PAGE>
                                 APPENDIX C

     Fundamental  Investment  Restrictions  The Fund has adopted  the  following
investment restrictions which, together with the foregoing investment objectives
and fundamental policies of the Equity Portfolio,  cannot be changed without the
approval  of  the  holders  of a  majority  of  the  outstanding  shares  of the
Portfolio.  As defined in the  Investment  Company  Act of 1940,  this means the
lesser of the vote of (a) 67% of the shares of the  Portfolio at a meeting where
more than 50% of the outstanding shares are present in person or by proxy or (b)
more than 50% of the  outstanding  shares of the  Portfolio.  Shares  have equal
rights as to voting,  except that only shares of the  Portfolio  are entitled to
vote on matters  affecting  only that  Portfolio  (such as changes in investment
objective, policies or restrictions). The Equity Portfolio may not:

     1.   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 that Portfolio's total assets would be
         invested in securities of that issuer.
     2.   Concentrate more than 25% of the value of its 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, and repurchase agreements secured
         thereby.
     3.   Purchase more than 10% of the outstanding voting securities
         of any issuer. In addition, the Fund may not in the
         aggregate purchase more than 10% of the outstanding voting
         securities of any issuer.
     4.   Purchase the securities of any issuer with less than three
         years' continuous operation if, as a result, more than 5% of
         the value of that Portfolio's total assets would be invested
         in securities of such issuers.
     5.   Make loans other than through the purchase of money market
         instruments and repurchase agreements or by the purchase of
         bonds, debentures or other debt securities. The purchase by
         a Portfolio of all or a portion of an issue of publicly or
         privately distributed debt obligations in accordance with
         its investment objective, policies and restrictions, shall
         not constitute the making of a loan.
     6.   Underwrite the securities of other issuers.
     7.   Purchase from or sell to any of the Fund's officers or
         Trustees, or firms of which any of them are members, any
         securities (other than capital stock of the Fund), but such
         persons or firms may act as brokers for the Fund for
         customary commissions.
     8.   Borrow money, except from banks for temporary or emergency
         purposes and then only in an amount up to 10% of the value
         of that Portfolio's total assets and except by engaging in
         reverse repurchase agreements; provided, however, that a
         Portfolio may only engage in reverse repurchase agreements
         so long as, at the time a Portfolio enters into a reverse
         repurchase agreement, the aggregate proceeds from
         outstanding reverse repurchase agreements, when added to
         other outstanding borrowings permitted by this section, do
         not exceed 33 1/3% of the Portfolio's total assets. In order
         to secure any permitted borrowings and reverse repurchase
         agreements under this section, each Portfolio may pledge,
         mortgage or hypothecate its assets.
     9.   Make short sales of securities or purchase any securities
         on margin except as provided for the Equity
         Portfolio with respect to options, futures
         contracts and options on futures contracts.
     10.  Write, purchase or sell puts, calls or combinations thereof
         except as provided for the Equity Portfolio with respect to options,
         futures contracts and  options on futures contracts.
     11.  Invest for the purpose of exercising control or management
         of another issuer.
     12.  Invest in commodities, commodities futures contracts, or
         real estate, although it may invest in securities which are
         secured by real estate or real estate mortgages and
         securities of issuers which invest or deal in commodities,
         commodity futures, real estate or real estate mortgages and
         provided that the Equity Portfolio
         may purchase or sell stock index futures, foreign currency
         futures, interest rate futures and options thereon.
     13.  Invest in interests in oil, gas, or other mineral
         exploration or development programs, although it may invest
         in securities of issuers which invest in or sponsor such
         programs.
     14.  Purchase or retain securities issued by investment
         companies except to the extent permitted by the Investment
         Company Act of 1940, as amended, and in connection with a
         trustee's/director's deferred compensation plan.

<PAGE>

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1Pursuant to Rule 15a-4, an investment advisor may provide services to a
portfolio and be paid for those services pursuant to a contract not yet
approved by shareholders for a maximum period of 120 days, provided that (a)
the Board of Trustees of the Fund has approved the contract, and (b) the
compensation does not exceed the amount payable to the preceding portfolio
manager under its contract with the Fund.
2Pursuant to Rule 15a-4, an investment advisor may provide services to a
portfolio and be paid for those services pursuant to a contract not yet
approved by shareholders for a maximum period of 120 days, provided that (a)
the Board of Trustees of the Fund has approved the contract, and (b) the
compensation does not exceed the amount payable to the preceding portfolio
manager under its contract with the Fund.




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