DREYFUS INSTITUTIONAL MONEY MARKET FUND INC
485BPOS, 1998-04-24
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                                                           File Nos. 2-67061
                                                                    811-3025
                     SECURITIES AND EXCHANGE COMMISSION
                           Washington, D.C. 20549

                                  FORM N-1A

REGISTRATION STATEMENT UNDER THE SECURITIES ACT OF 1933               [X]

     Pre-Effective Amendment No.                                      [__]
   

     Post-Effective Amendment No. 31                                  [X]
    

                                   and/or

REGISTRATION STATEMENT UNDER THE INVESTMENT COMPANY ACT OF 1940       [X]
   

     Amendment No. 31                                                 [X]
    

                      (Check appropriate box or boxes.)

                   DREYFUS INSTITUTIONAL MONEY MARKET FUND
             (Exact Name of Registrant as Specified in Charter)


          c/o The Dreyfus Corporation
          200 Park Avenue, New York, New York          10166
          (Address of Principal Executive Offices)     (Zip Code)

     Registrant's Telephone Number, including Area Code: (212) 922-6000

                            Mark N. Jacobs, Esq.
                               200 Park Avenue
                          New York, New York 10166
                   (Name and Address of Agent for Service)

It is proposed that this filing will become effective (check appropriate
box)

          immediately upon filing pursuant to paragraph (b)
     ----
   

       X  on May 1, 1998 pursuant to paragraph (b)
     ----
    

          60 days after filing pursuant to paragraph (a)(i)
     ----
          on     (date)      pursuant to paragraph (a)(i)
     ----
          75 days after filing pursuant to paragraph (a)(ii)
     ----
          on     (date)      pursuant to paragraph (a)(ii) of Rule 485
     ----

If appropriate, check the following box:

               this post-effective amendment designates a new effective date
               for a previously filed post-effective amendment.
     ----
   
    





                   DREYFUS INSTITUTIONAL MONEY MARKET FUND
                Cross-Reference Sheet Pursuant to Rule 495(a)
Items in
Part A of
Form N-1A     Caption                                       Page
_________     _______                                       ____
   

  1          Cover Page                                    Cover

  2          Synopsis                                      2

  3          Condensed Financial Information               3 and 4

  4          General Description of Registrant             4

  5          Management of the Fund                        6

  5(a)       Management's Discussion of Fund's Performance *

  6          Capital Stock and Other Securities            16

  7          Purchase of Securities Being Offered          7

  8          Redemption or Repurchase                      11

  9          Pending Legal Proceedings                     *
    


Items in
Part B of
Form N-1A
_________

   

  10         Cover Page                                    Cover

  11         Table of Contents                             Cover

  12         General Information and History               B-21

  13         Investment Objectives and Policies            B-2

  14         Management of the Fund                        B-5

  15         Control Persons and Principal                 B-10
             Holders of Securities

  16         Investment Advisory and Other                 B-10
             Services
    

_____________________________________
NOTE:  * Omitted since answer is negative or inapplicable.
                   DREYFUS INSTITUTIONAL MONEY MARKET FUND
          Cross-Reference Sheet Pursuant to Rule 495(a) (continued)

Items in
Part B of
Form N-1A     Caption                                      Page
_________     _______                                      _____

   

  17          Brokerage Allocation                         B-18

  18          Capital Stock and Other Securities           B-21

  19          Purchase, Redemption and Pricing             B-12, B-14
              of Securities Being Offered                  and B-19

  20          Tax Status                                   *

  21          Underwriters                                 B-1 and B-12

  22          Calculations of Performance Data             B-20

  23          Financial Statements                         B-22
    

Items in
Part C of
Form N-1A
_________

  24          Financial Statements and Exhibits            C-1

  25          Persons Controlled by or Under               C-4
              Common Control with Registrant

  26          Number of Holders of Securities              C-4

  27          Indemnification                              C-4

  28          Business and Other Connections of            C-5
              Investment Adviser
   

  29          Principal Underwriters                       C-10

  30          Location of Accounts and Records             C-13

  31          Management Services                          C-13

  32          Undertakings                                 C-13
    

_____________________________________
NOTE:  * Omitted since answer is negative or inapplicable.

_______________________________________________________________________________
                                   DREYFUS
                                INSTITUTIONAL
                                 MONEY MARKET
                                     FUND
                              Registration Mark
      * NO SALES CHARGE
      * NO REDEMPTION FEE
      * FREE EXCHANGE BETWEEN
        DREYFUS FUNDS BY PHONE
_______________________________________________________________________________
                                   PROSPECTUS
_______________________________________________________________________________
   

                                   May 1, 1998
              TABLE OF CONTENTS                                       PAGE
              ANNUAL FUND OPERATING EXPENSES...................         2
              CONDENSED FINANCIAL INFORMATION..................         3
              YIELD INFORMATION................................         4
              DESCRIPTION OF THE FUND..........................         4
              MANAGEMENT OF THE FUND...........................         6
              HOW TO BUY SHARES................................         7
              SHAREHOLDER SERVICES.............................         9
              HOW TO REDEEM SHARES.............................        11
              SHAREHOLDER SERVICES PLAN........................        14
              DIVIDENDS, DISTRIBUTIONS AND TAXES...............        14
              GENERAL INFORMATION..............................        16
              APPENDIX.........................................        17
    

______________________________________________________________________________
THESE SECURITIES HAVE NOT BEEN APPROVED OR DISAPPROVED BY THE SECURITIES AND
EXCHANGE COMMISSION OR ANY STATE SECURITIES COMMISSION NOR HAS THE SECURITIES
AND EXCHANGE COMMISSION OR ANY STATE SECURITIES COMMISSION PASSED UPON THE
ACCURACY OR ADEQUACY OF THIS PROSPECTUS. ANY REPRESENTATION TO THE CONTRARY
IS A CRIMINAL OFFENSE.
_______________________________________________________________________________
Dreyfus Institutional Money Market Fund (the "Fund") is an open-end,
diversified, management investment company, known as a money market mutual
fund. The Fund's investment objective is to provide you with as high a level
of current income as is consistent with the preservation of capital and the
maintenance of liquidity.
The Fund permits you to invest in two separate portfolios, the Money Market
Series and the Government Securities Series. The Money Market Series invests
in short-term money market instruments consisting of securities issued or
guaranteed by the U.S. Government or its agencies or instrumentalities, bank
obligations, repurchase agreements and high grade commercial paper. The
Government Securities Series invests only in short-term securities issued or
guaranteed as to principal and interest by the U.S. Government.
You can invest, reinvest or redeem shares at any time without charge or
penalty. The Fund provides free redemption checks, which you can use in
amounts of $500 or more for cash or to pay bills. You continue to earn income
on the amount of the check until it clears.
The Dreyfus Corporation professionally manages the Fund's portfolios.
          This Prospectus sets forth concisely information about the Fund
that you should know before investing. It should be read and retained for
future reference.
   

          The Statement of Additional Information, dated May 1, 1998, which
may be revised from time to time, provides a further discussion of certain
areas in this Prospectus and other matters which may be of interest to some
investors. It has been filed with the Securities and Exchange Commission and
is incorporated herein by reference. The Securities and Exchange Commission
maintains a Web site (http://www.sec.gov) that contains the Statement of
Additional Information, material incorporated by reference, and other
information regarding the Fund. For a free copy of the Statement of
Additional Information, write to the Fund at 144 Glenn Curtiss Boulevard,
Uniondale, New York 11556-0144, or call 1-800-242-8671. When telephoning, ask
for Operator 144.
    

          AN INVESTMENT IN THE FUND IS NEITHER INSURED NOR GUARANTEED BY THE
U.S. GOVERNMENT. THERE CAN BE NO ASSURANCE THAT EACH SERIES WILL BE ABLE TO
MAINTAIN A STABLE NET ASSET VALUE OF $1.00 PER SHARE.
          MUTUAL FUND SHARES ARE NOT DEPOSITS OR OBLIGATIONS OF, OR
GUARANTEED OR ENDORSED BY, ANY BANK, AND ARE NOT FEDERALLY INSURED BY THE
FEDERAL DEPOSIT INSURANCE CORPORATION, THE FEDERAL RESERVE BOARD, OR ANY
OTHER AGENCY.

   
<TABLE>


                                                      Annual Fund Operating Expenses
                                               (as a percentage of average daily net assets)
                                                                                               Money         Government
                                                                                               Market        Securities
                                                                                               Series          Series
                                                                                               ______         ________
<S>                                                                                              <C>             <C>
        Management Fees .......................................................                 .50%             .50%
        Other Expenses.........................................................                 .07%             .11%
        Total Fund Operating Expenses..........................................                 .57%             .61%
      Example:
        You would pay the following expenses on
        a $1,000 investment, assuming (1) 5%
        annual return and (2) redemption at the
        end of each time period:
                                                         1 YEAR                                 $ 6               $ 6
                                                         3 YEARS                                $18               $20
                                                         5 YEARS                                $32               $34
                                                        10 YEARS                                $71               $76
</TABLE>
    

_______________________________________________________________________________
          The amounts listed in the example should not be considered as
representative of past or future expenses and actual expenses may be greater
or less than those indicated. Moreover, while the example assumes a 5% annual
return, each series' actual performance will vary and may result in an actual
return greater or less than 5%.
_______________________________________________________________________________
          The purpose of the foregoing table is to assist you in
understanding the costs and expenses borne by each series, the payment of
which will reduce investors' annual return. You can purchase shares of either
series without charge directly from the Fund's distributor; you may be
charged a fee if you effect transactions in shares of either series through a
securities dealer, bank or other financial institution. See "Management of
the Fund" and "Shareholder Services Plan."

                            [Page 2]
                          Condensed Financial Information
   

          The information in the following tables has been audited by Ernst &
Young LLP, the Fund's independent auditors. Further financial data, related
notes and report of independent auditors accompany the Statement of
Additional Information, available upon request.
    

                               FINANCIAL HIGHLIGHTS
          Contained below is per share operating performance data for a share
of beneficial interest outstanding, total investment return, ratios to
average net assets and other supplemental data for each year indicated. This
information has been derived from the Fund's financial statements.
   
<TABLE>

                                                                            Money Market Series
                               _____________________________________________________________________________________________-_
                                                                          Year Ended December 31,
                               _______________________________________________________________________________________________
                                1988      1989      1990      1991      1992      1993      1994      1995      1996      1997
                               _____     _____     _____     _____     _____     _____     _____     _____     _____     _____
<S>                            <C>       <C>       <C>       <C>       <C>       <C>       <C>       <C>       <C>        <C>
PER SHARE DATA:
  Net asset value,
   beginning of year..         $1.00     $1.00     $1.00     $1.00     $1.00     $1.00     $1.00     $1.00     $1.00     $1.00
                               _____     _____     _____     _____     _____     _____     _____     _____     _____     _____
  INVESTMENT OPERATIONS:
  Investment income-net....     .071      .088      .077      .057      .035      .027      .036      .054      .049      .051
                               _____     _____     _____     _____     _____     _____     _____     _____     _____     _____
  DISTRIBUTIONS:
  Dividends from investment
  income-net......             (.071)    (.088)    (.077)    (.057)    (.035)    (.027)    (.036)    (.054)    (.049)    (.051)
                               _____     _____     _____     _____     _____     _____     _____     _____     _____     _____
  Net asset value, end
   of year.......              $1.00     $1.00     $1.00     $1.00     $1.00     $1.00     $1.00     $1.00     $1.00     $1.00
                               =====     =====     =====     =====     =====     =====     =====     =====     =====     =====
TOTAL INVESTMENT RETURN..       7.37%     9.14%     7.99%     5.85%     3.51%     2.76%     3.65%     5.57%     5.03%     5.17%
RATIOS/SUPPLEMENTAL DATA:
  Ratio of expenses to average
   net assets......              .50%      .50%      .50%      .60%      .63%      .63%      .63%      .62%      .58%      .57%
  Ratio of net investment
   income to average net
   assets.......                7.16%     8.79%     7.72%     5.73%     3.48%     2.72%     3.59%     5.43%     4.91%     5.06%
  Decrease reflected in above
   expense ratios due
   to undertakings by
   The Dreyfus Corporation...    .07%      .07%      .08%      _         _         _         _         _          _        _
  Net Assets,end of year
  (000's omitted)....       $707,023  $477,113  $401,461  $354,090  $329,574  $354,177  $362,825  $402,032  $483,156  $531,436
</TABLE>
    
                            [Page 3]
   
<TABLE>

                                                               Government Securities Series
                               _____________________________________________________________________________________________-_
                                                                          Year Ended December 31,
                               _______________________________________________________________________________________________
                                1988      1989      1990      1991      1992      1993      1994      1995      1996      1997
                               _____     _____     _____     _____     _____     _____     _____     _____     _____     _____
<S>                            <C>       <C>       <C>       <C>       <C>       <C>       <C>       <C>       <C>       <C>
PER SHARE DATA:
  Net asset value,
   beginning of year..         $1.00     $1.00     $1.00     $1.00     $1.00     $1.00     $1.00     $1.00     $1.00     $1.00
                               _____     _____     _____     _____     _____     _____     _____     _____     _____     _____
  INVESTMENT OPERATIONS:
  Investment income-net...      .068      .086      .076      .056      .034      .026      .034      .052      .047      .048
                               _____     _____     _____     _____     _____     _____     _____     _____     _____     _____
  DISTRIBUTIONS:
  Dividends from investment
   income-net..........        (.068)    (.086)    (.076)    (.056)    (.034)    (.026)    (.034)    (.052)    (.047)    (.048)
                               _____     _____     _____     _____     _____     _____     _____     _____     _____     _____
  Net asset value, end
   of year......               $1.00     $1.00     $1.00    $ 1.00     $1.00     $1.00     $1.00     $1.00     $1.00     $1.00
                               =====     =====     =====     =====     =====     =====     =====     =====     =====     =====
TOTAL INVESTMENT RETURN...      6.99%     8.90%     7.85%     5.71%     3.44%     2.63%     3.49%     5.36%     4.84%     4.95%
RATIOS/SUPPLEMENTAL DATA:
  Ratio of expenses to average
   net assets..........          .50%      .50%      .50%      .65%      .64%      .65%      .69%      .65%      .63%      .61%
  Ratio of net investment income
   to average net assets...     6.68%     8.54%     7.58%     5.64%     3.42%     2.61%     3.40%     5.23%     4.74%     4.84%
  Decrease reflected in above
   expense ratios due
   to undertakings by
   The Dreyfus Corporation...    .09%      .11%      .10%       _         _         _         _         _         _         _
  Net Assets,end of year
   (000's omitted).....     $272,232  $214,481  $246,174  $174,173  $192,141  $134,574  $120,281  $123,171  $102,726  $107,694
</TABLE>
    


                                  YIELD INFORMATION
          From time to time, each series advertises its yield and effective
yield. Both yield figures are based on historical earnings and are not
intended to indicate future performance. It can be expected that these yields
will fluctuate substantially. The yield of a series refers to the income
generated by an investment in the series over a seven-day period (which
period will be stated in the advertisement). This income is then annualized.
That is, the amount of income generated by the investment during that week is
assumed to be generated each week over a 52-week period and is shown as a
percentage of the investment. The effective yield is calculated similarly,
but, when annualized, the income earned by an investment in the series is
assumed to be reinvested. The effective yield will be slightly higher than
the yield because of the compounding effect of this assumed reinvestment.
Each series' yield and effective yield may reflect absorbed expenses pursuant
to any undertaking that may be in effect. See "Management of the Fund."
          Yield information is useful in reviewing the Fund's performance,
but because yields will fluctuate, under certain conditions such information
may not provide a basis for comparison with domestic bank deposits, other
investments which pay a fixed yield for a stated period of time, or other
investment companies which may use a different method of computing yield.
          Comparative performance information may be used from time to time
in advertising or marketing the Fund's shares, including data from Lipper
Analytical Services, Inc., IBC's Money Fund Reporttrademark, Bank Rate
Monitortrademark, N. Palm Beach, Fla. 33408, Morningstar, Inc. and other
industry publications.
                              DESCRIPTION OF THE FUND
INVESTMENT OBJECTIVE
          The Fund's investment objective is to provide you with as high a
level of current income as is consistent with the preservation of capital and
the maintenance of liquidity. It cannot be changed, as to a series, without
approval by the holders of a majority (as defined in the Investment Company
Act of 1940, as amended (the "1940 Act")) of such series' outstanding voting
shares. There can be no assurance that the series' investment
                            [Page 4]
objective will be achieved. Each series pursues this objective in
the manner described below. Securities in which the series invest may not
earn as high a level of current income as long-term or lower quality
securities which generally have less liquidity, greater market risk and more
fluctuation in market value.
MANAGEMENT POLICIES
          Each series seeks to maintain a net asset value of $1.00 per share
for purchases and redemptions. To do so, the Fund uses the amortized cost
method of valuing each series' securities pursuant to Rule 2a-7 under the
1940 Act, which Rule includes various maturity, quality and diversification
requirements, certain of which are summarized below.
   

          In accordance with Rule 2a-7, each series will maintain a
dollar-weighted average portfolio maturity of 90 days or less, purchase only
instruments having remaining maturities of 13 months or less and invest only
in U.S. dollar denominated securities determined in accordance with
procedures established by the Fund's Board to present minimal credit risks
and, with respect to the Money Market Series, which are rated in one of the
two highest rating categories for debt obligations by at least two nationally
recognized statistical rating organizations (or one rating organization if
the instrument was rated by only one such organization) or, if unrated, are
of comparable quality as determined in accordance with procedures established
by the Fund's Board. The nationally recognized statistical rating
organizations currently rating instruments of the type the Money Market
Series may purchase are Moody's Investors Service, Inc., Standard & Poor's
Ratings Group, Duff & Phelps Credit Rating Co., Fitch IBCA, Inc. and Thomson
BankWatch, Inc., and their rating criteria are described in the "Appendix" to
the Statement of Additional Information. For further information regarding
the amortized cost method of valuing securities, see "Determination of Net
Asset Value" in the Statement of Additional Information. There can be no
assurance that the series will be able to maintain a stable net asset value
of $1.00 per share.
    

THE MONEY MARKET SERIES _ The Money Market Series invests in short-term
money market obligations, including securities issued or guaranteed by the
U.S. Government or its agencies or instrumentalities, certificates of
deposit, time deposits, bankers' acceptances and other short-term obligations
issued by domestic banks and London branches of domestic banks, repurchase
agreements, and high grade commercial paper and other short-term corporate
obligations. See "Appendix_Certain Portfolio Securities." Generally, at
least 25% of the value of the Money Market Series' total assets will be
invested in bank obligations. See "Investment Considerations and Risks"
below.
THE GOVERNMENT SECURITIES SERIES _ The Government Securities Series invests
only in short-term securities issued or guaranteed as to principal and
interest by the U.S. Government (whether or not subject to repurchase
agreements). See "Appendix_Certain Portfolio Securities." In addition, the
Government Securities Series is permitted to lend securities from its
portfolio. See "Appendix_Investment Techniques."
INVESTMENT CONSIDERATIONS AND RISKS
GENERAL _ Each series attempts to increase yields by trading to take
advantage of short-term market variations. This policy is expected to result
in high portfolio turnover but should not adversely affect the series since
it usually does not pay brokerage commissions when it purchases short-term
debt obligations. The value of the portfolio securities held by the series
will vary inversely to changes in prevailing interest rates. Thus, if
interest rates have increased from the time a security was purchased, such
security, if sold, might be sold at a price less than its cost. Similarly, if
interest rates have declined from the time a security was purchased, such
security, if sold, might be sold at a price greater than its purchase cost.
In either instance, if the security was purchased at face value and held to
maturity, no gain or loss would be realized.
FOREIGN SECURITIES _ Since the Money Market Series' portfolio may contain
securities issued by London branches of domestic banks, this series may be
subject to additional investment risks with respect to such
                            [Page 5]
securities that are different in some respects from those incurred by a fund
which invests only in debt obligations of U.S. domestic issuers. Such risks
include possible adverse political and economic developments, seizure or
nationalization of foreign deposits, and adoption of governmental
restrictions which might adversely affect or restrict the payment of
principal and interest on these securities.
BANK SECURITIES _ To the extent the Money Market Series' investments are
concentrated in the banking industry, the series will have correspondingly
greater exposure to the risk factors which are characteristic of such
investments. Sustained increases in interest rates can adversely affect the
availability or liquidity and cost of capital funds for a bank's lending
activities, and a deterioration in general economic conditions could increase
the exposure to credit losses. In addition, the value of and the investment
return on the Money Market Series' shares could be affected by economic or
regulatory developments in or related to the banking industry, which industry
also is subject to the effects of competition within the banking industry as
well as with other types of financial institutions. The Money Market Series,
however, will seek to minimize its exposure to such risks by investing only
in debt securities which are determined to be of high quality.
SIMULTANEOUS INVESTMENTS _ Investment decisions for the Fund are made
independently from those of other investment companies advised by The Dreyfus
Corporation. If, however, such other investment companies desire to invest
in, or dispose of, the same securities as the Fund, available investments or
opportunities for sales will be allocated equitably to each investment
company. In some cases, this procedure may adversely affect the price paid or
received by the Fund or the size of the position obtained for or disposed of
by the Fund.
   

Year 2000 Risks _ Like other mutual funds, financial and business
organizations and individuals around the world, the Fund could be adversely
affected if the computer systems used by The Dreyfus Corporation and the
Fund's other service providers do not properly process and calculate
date-related information and data from and after January 1, 2000. This is
commonly known as the "Year 2000 Problem." The Dreyfus Corporation is taking
steps to address the Year 2000 Problem with respect to the computer systems
that it uses and to obtain assurances that comparable steps are being taken
by the Fund's other major service providers. At this time, however, there can
be no assurance that these steps will be sufficient to avoid any adverse
impact on the Fund.
    

                           MANAGEMENT OF THE FUND
   

INVESTMENT ADVISER _ The Dreyfus Corporation, located at 200 Park Avenue,
New York, New York 10166, was formed in 1947 and serves as the Fund's
investment adviser. The Dreyfus Corporation is a wholly-owned subsidiary of
Mellon Bank, N.A., which is a wholly-owned subsidiary of Mellon Bank
Corporation ("Mellon"). As of March 31, 1998, The Dreyfus Corporation managed
or administered approximately $100 billion in assets for approximately 1.7
million investor accounts nationwide.
    
   
          The Dreyfus Corporation supervises and assists in the overall
management of the Fund's affairs under a Management Agreement with the Fund,
subject to the authority of the Fund's Board in accordance with Massachusetts
law.
    
   
          Mellon is a publicly owned multibank holding company incorporated
under Pennsylvania law in 1971 and registered under the Federal Bank Holding
Company Act of 1956, as amended. Mellon provides a comprehensive range of
financial products and services in domestic and selected international
markets. Mellon is among the twenty-five largest bank holding companies in
the United States based on total assets. Mellon's principal wholly-owned
subsidiaries are Mellon Bank, N.A., Mellon Bank (DE) National Association,
Mellon Bank (MD), The Boston Company, Inc., AFCOCredit Corporation and a
number of companies known as Mellon Financial Services Corporations. Through
its subsidiaries, including The Dreyfus Corporation, Mellon managed more than
$305 billion in assets as of December 31, 1997, including approximately $104
billion in proprietary mutual fund assets. As of December 31, 1997, Mellon,
through various subsidiaries,
                            [Page 6]
provided non-investment services, such as custodial or
administration services, for more than $1.532 trillion in assets, including
approximately $60 billion in mutual fund assets.
    
   
          For the year ended December 31, 1997, the Fund paid The Dreyfus
Corporation a monthly management fee at the annual rate of .50 of 1% of the
value of each series' average daily net assets. From time to time, The
Dreyfus Corporation may waive receipt of its fees and/or voluntarily assume
certain expenses of either series of the Fund, which would have the effect of
lowering the expense ratio of that series and increasing yield to investors.
The Fund will not pay The Dreyfus Corporation at a later time for any amounts
it may waive, nor will the Fund reimburse The Dreyfus Corporation for any
amounts it may assume.
    

          In allocating brokerage transactions, The Dreyfus Corporation seeks
to obtain the best execution of orders at the most favorable net price.
Subject to this determination, The Dreyfus Corporation may consider, among
other things, the receipt of research services and/or the sale of shares of
the Fund or other funds managed, advised or administered by The Dreyfus
Corporation as factors in the selection of broker-dealers to execute
portfolio transactions for the Fund. See "Portfolio Transactions" in the
Statement of Additional Information.
          The Dreyfus Corporation may pay the Fund's distributor for
shareholder services from The Dreyfus Corporation's own assets, including
past profits but not including the management fee paid by the Fund. The
Fund's distributor may use part or all of such payments to pay securities
dealers, banks or other financial institutions in respect of these services.
DISTRIBUTOR _ The Fund's distributor is Premier Mutual Fund Services, Inc.
(the "Distributor"), located at 60 State Street, Boston, Massachusetts 02109.
The Distributor's ultimate parent is Boston Institutional Group, Inc.
   

TRANSFER AND DIVIDEND DISBURSING AGENT AND CUSTODIAN _ Dreyfus Transfer,
Inc., a wholly-owned subsidiary of The Dreyfus Corporation, P.O. Box 9671,
Providence, Rhode Island 02940-9671, is the Fund's Transfer and Dividend
Disbursing Agent (the "Transfer Agent"). The Bank of New York, 90 Washington
Street, New York, New York 10286, is the Fund's Custodian.
    

                              HOW TO BUY SHARES
          Shares of each series are sold without a sales charge. You may be
charged a fee if you effect transactions in shares of either series through a
securities dealer, bank or other financial institution. Share certificates
are issued only upon your written request. No certificates are issued for
fractional shares. The Fund reserves the right to reject any purchase order.
          The minimum initial investment in each series is $50,000, unless
you are a client of a securities dealer, bank or other financial institution
which maintains an omnibus account in the Fund and has made an aggregate
minimum initial purchase for its customers of $50,000. Subsequent investments
in either series must be at least $100. The initial investment must be
accompanied by the Account Application.
          You may purchase Fund shares by check or wire. Checks should be
made payable to "The Dreyfus Family of Funds." Payments to open new accounts
which are mailed should be sent to The Dreyfus Family of Funds, P.O. Box
9387, Providence, Rhode Island 02940-9387, together with your Account
Application indicating the name of the series being purchased. For subsequent
investments, your Fund account number should appear on the check and an
investment slip should be enclosed and sent to The Dreyfus Family of Funds,
P.O. Box 105, Newark, New Jersey 07101-0105. Neither initial nor subsequent
investments should be made by third party check. Purchase orders may be
delivered in person only to a Dreyfus Financial Center. These orders will be
forwarded to the Fund and will be processed only upon receipt thereby. For
the location of the nearest Dreyfus Financial Center, please call one of the
telephone numbers listed under "General Information."

                            [Page 7]
   

          Wire payments may be made to The Bank of New York if your bank
account is in a commercial bank that is a member of the Federal Reserve
System or any other bank having a correspondent bank in New York City.
Immediately available funds may be transmitted by wire for the Money Market
Series to The Bank of New York, DDA #8900051922/Dreyfus Institutional Money
Market Fund/Money Market Series, or for the Government Securities Series to
The Bank of New York, DDA#8900051949/ Dreyfus Institutional Money Market
Fund/Government Securities Series, for purchase of  Fund shares in your name.
The wire must include your Fund account number (for new accounts, your
Taxpayer Identification Number ("TIN") should be included instead), account
registration and dealer number, if applicable. If your initial purchase of
Fund shares is by wire, please call 1-800-645-6561 after completing your wire
payment to obtain your Fund account number. Please include your Fund account
number on the Account Application and promptly mail the Account Application
to the Fund, as no redemption will be permitted until the Account Application
is received. You may obtain further information about remitting funds in this
manner from your bank. All payments should be made in U.S. dollars and, to
avoid fees and delays, should be drawn only on U.S. banks. A charge will be
imposed if any check used for investment in your account does not clear. The
Fund makes available to certain large institutions the ability to issue
purchase instructions through compatible computer facilities.
    

          Shares also may be purchased through Dreyfus-Automatic Asset
BuilderRegistration Mark, Dreyfus Government Direct Deposit Privilege and
Dreyfus Payroll Savings Plan described under "Shareholder Services." These
services enable you to make regularly scheduled investments and may provide
you with a convenient way to invest for long-term financial goals. You should
be aware, however, that periodic investment plans do not guarantee a profit
and will not protect an investor against loss in a declining market.
          Subsequent investments also may be made by electronic transfer of
funds from an account maintained in a bank or other domestic financial
institution that is an Automated Clearing House member. You must direct the
institution to transmit immediately available funds through the Automated
Clearing House to The Bank of New York with instructions to credit your Fund
account. The instructions must specify your Fund account registration and
your Fund account number preceded by the digits "1111."
   

          Each series' shares are sold on a continuous basis at the net asset
value per share next determined after an order and Federal Funds (monies of
member banks within the Federal Reserve System which are held on deposit at a
Federal Reserve Bank) are received by the Transfer Agent or other entity
authorized to receive orders on behalf of the Fund. If you do not remit
Federal Funds, your payment must be converted into Federal Funds. This
usually occurs within one day of receipt of a bank wire and within two
business days of receipt of a check drawn on a member bank of the Federal
Reserve System. Checks drawn on banks which are not members of the Federal
Reserve System may take considerably longer to convert into Federal Funds.
Prior to receipt of Federal Funds, your money will not be invested.
    
   
          The net asset value per share of each series is determined twice
each business day at 12:00 Noon, New York time, and as of the close of
trading on the floor of the New York Stock Exchange (currently 4:00 p.m., New
York time), on each day the New York Stock Exchange or, with respect to the
Money Market Series, the Transfer Agent is open for business. Net asset value
per share is computed by dividing the value of the net assets of each series
(i.e., the value of its assets less liabilities) by the total number of
shares of such series outstanding. See "Determination of Net Asset Value" in
the Statement of Additional Information.
    
   
          If your payments are received in or converted into Federal Funds by
12:00 Noon, New York time, by the Transfer Agent, you will receive the
dividend declared on that day. If your payments are received in or converted
into Federal Funds after 12:00 Noon, New York time, by the Transfer Agent,
your shares will begin to accrue dividends on the following business day.
    


                            [Page 8]
   

          Qualified institutions may telephone orders for purchase of either
series' shares by telephoning the Distributor or its designee toll free at
1-800-346-3621; in New York City, call 1-718-895-1650; on Long Island, call
794-5452. A telephone order placed with the Distributor or its designee in
New York will become effective at the price determined at 12:00 Noon, New
York time, and the shares purchased will receive the dividend on such series'
shares declared on that day if such order is placed by 12:00 Noon, New York
time, and Federal Funds are received by the Transfer Agent by 4:00 p.m., New
York time.
    

          Federal regulations require that you provide a certified TIN upon
opening or reopening an account. See "Dividends, Distributions and Taxes" and
the Account Application for further information concerning this requirement.
Failure to furnish a certified TIN to the Fund could subject you to a $50
penalty imposed by the Internal Revenue Service ("IRS").
PROCEDURES FOR MULTIPLE ACCOUNTS
          Special procedures have been designed for banks and other
institutions that wish to open multiple accounts. The institution may open a
single master account by filing one application with the Transfer Agent and
may open individual sub-accounts at the same time or at some later date. For
further information, please refer to the Statement of Additional Information.
                              SHAREHOLDER SERVICES
FUND EXCHANGES _ You may purchase, in exchange for shares of a series,
shares of the Fund's other series or shares of certain other funds managed or
administered by The Dreyfus Corporation, to the extent such shares are
offered for sale in your state of residence. These funds have different
investment objectives which may be of interest to you. If you desire to use
this service, please call 1-800-645-6561 to determine if it is available and
whether any conditions are imposed by its use.
          To request an exchange, you must give exchange instructions to the
Transfer Agent in writing or by telephone. Before any exchange, you must
obtain and should review a copy of the current prospectus of the fund into
which the exchange is being made. Prospectuses may be obtained by calling
1-800-645-6561. Except in the case of personal retirement plans, the shares
being exchanged must have a current value of at least $500; furthermore, when
establishing a new account by exchange, shares being exchanged must have a
value of at least the minimum initial investment required for the fund or
series into which the exchange is being made. The ability to issue exchange
instructions by telephone is given to all shareholders automatically, unless
you check the applicable "No" box on the Account Application, indicating that
you specifically refuse this Privilege. The Telephone Exchange Privilege may
be established for an existing account by written request signed by all
shareholders on the account, by a separate signed Shareholder Services Form,
available by calling 1-800-645-6561, or by oral request from any of the
authorized signatories on the account by calling 1-800-645-6561. If you have
established the Telephone Exchange Privilege, you may telephone exchange
instructions (including over The Dreyfus TouchRegistration Mark automated
telephone system) by calling 1-800-645-6561. If you are calling from overseas,
call 516-794-5452. See "How to Redeem Shares _ Procedures." Upon an exchange
into a new account, the following shareholder services and privileges, as
applicable and where available, will be automatically carried over to the fund
into which the exchange is made: Telephone Exchange Privilege, Check
Redemption Privilege, Wire Redemption Privilege, Telephone Redemption
Privilege and the dividend/capital gain distribution option (except for
Dreyfus Dividend Sweep) selected by the investor.
          Shares will be exchanged at the next determined net asset value;
however, a sales load may be charged with respect to exchanges into funds
sold with a sales load. If you are exchanging into a fund that charges a
sales load, you may qualify for share prices which do not include the sales
load or which reflect a reduced sales load, if the shares you are exchanging
were: (a) purchased with a sales load, (b) acquired by a previous exchange
from shares purchased with a sales load, or (c) acquired through reinvestment
of dividends or distributions
                            [Page 9]
paid with respect to the foregoing categories of shares. To
qualify, at the time of the exchange you must notify the Transfer Agent. Any
such qualification is subject to confirmation of your holdings through a
check of appropriate records. See "Shareholder Services" in the Statement of
Additional Information. No fees currently are charged shareholders directly
in connection with exchanges, although the Fund reserves the right, upon not
less than 60 days' written notice, to charge shareholders a nominal
administrative fee in accordance with rules promulgated by the Securities and
Exchange Commission. The Fund reserves the right to reject any exchange
request in whole or in part. The availability of Fund Exchanges may be
modified or terminated at any time upon notice to shareholders. See
"Dividends, Distributions and Taxes."
DREYFUS AUTO-EXCHANGE PRIVILEGE _ Dreyfus Auto-Exchange Privilege enables
you to invest regularly (on a semi-monthly, monthly, quarterly or annual
basis), in exchange for shares of either series of the Fund, in shares of the
Fund's other series or certain other funds in the Dreyfus Family of Funds of
which you are a shareholder. The amount you designate, which can be expressed
either in terms of a specific dollar or share amount ($100 minimum), will be
exchanged automatically on the first and/or fifteenth of the month according
to the schedule you have selected. Shares will be exchanged at the
then-current net asset value; however, a sales load may be charged with
respect to exchanges into funds sold with a sales load. See "Shareholder
Services" in the Statement of Additional Information. The right to exercise
this Privilege may be modified or cancelled by the Fund or the Transfer
Agent. You may modify or cancel your exercise of this Privilege at any time
by mailing written notification to The Dreyfus Family of Funds, P.O. Box 9671,
Providence, Rhode Island 02940-9671. The Fund may charge a service fee for
the use of this Privilege. No such fee currently is contemplated. For more
information concerning this Privilege and the funds in the Dreyfus Family of
Funds eligible to participate in this Privilege, or to obtain a Dreyfus
Auto-Exchange Authorization Form, please call toll free 1-800-645-6561. See
"Dividends, Distributions and Taxes."
   

DREYFUS-AUTOMATIC ASSET BUILDERRegistration Mark _ Dreyfus-Automatic Asset
Builder permits you to purchase shares (minimum of $100 and maximum of
$150,000 per transaction) at regular intervals selected by you. Fund shares
are purchased by transferring funds from the bank account designated by you.
Only an account maintained at a domestic financial institution which is an
Automated Clearing House member may be so designated. To establish a
Dreyfus-Automatic Asset Builder account, you must file an authorization form
with the Transfer Agent. You may obtain the necessary authorization form by
calling 1-800-645-6561. You may cancel your participation in this Privilege
or change the amount of your purchase at any time by mailing written
notification to The Dreyfus Family of Funds, P.O. Box 9671, Providence, Rhode
Island 02940-9671. The notification will be effective three business days
following receipt. The Fund may modify or terminate this Privilege at any
time or charge a service fee.  No such fee currently is contemplated.
    

DREYFUS GOVERNMENT DIRECT DEPOSIT PRIVILEGE _ Dreyfus Government Direct
Deposit Privilege enables you to purchase shares (minimum of $100 and maximum
of $50,000 per transaction) by having Federal salary, Social Security, or
certain veterans', military or other payments from the Federal government
automatically deposited into your Fund account. You may deposit as much of
such payments as you elect. To enroll in Dreyfus Government Direct Deposit,
you must file with the Transfer Agent a completed Direct Deposit Sign-Up Form
for each type of payment that you desire to include in this Privilege. The
appropriate form may be obtained by calling 1-800-645-6561. Death or legal
incapacity will terminate your participation in this Privilege. You may elect
at any time to terminate your participation by notifying in writing the
appropriate Federal agency. Further, the Fund may terminate your
participation upon 30 days' notice to you.
DREYFUS PAYROLL SAVINGS PLAN _ Dreyfus Payroll Savings Plan permits you to
purchase shares (minimum of $100 per transaction) automatically on a regular
basis. Depending upon your employer's direct deposit program, you may have
part or all of your paycheck transferred to your existing Dreyfus account
electronically through the
                            [Page 10]
Automated Clearing House system at each pay period. To establish a Dreyfus
Payroll Savings Plan account, you must file an authorization form with your
employer's payroll department. Your employer must complete the reverse side
of the form and return it to The Dreyfus Family of Funds, P.O. Box 9671,
Providence, Rhode Island 02940-9671. You may obtain the necessary
authorization form by calling 1-800-645-6561. You may change the amount of
purchase or cancel the authorization only by written notification to your
employer. It is the sole responsibility of your employer, not the
Distributor, The Dreyfus Corporation, the Fund, the Transfer Agent or any
other person, to arrange for transactions under the Dreyfus Payroll Savings
Plan. The Fund may modify or terminate this Privilege at any time or charge a
service fee. No such fee currently is contemplated.
DREYFUS DIVIDEND OPTIONS _ Dreyfus Dividend Sweep enables you to invest
automatically dividends or dividends and capital gain distributions, if any,
paid by the series in shares of another fund in the Dreyfus Family of Funds
of which you are a shareholder. Shares of the other fund will be purchased at
the then-current net asset value; however, a sales load may be charged with
respect to investments in shares of a fund sold with a sale load. If you are
investing in a fund that charges a sales load, you may qualify for share
prices which do not include the sales load or which reflect a reduced sales
load. If you are investing in a fund that charges a contingent deferred sales
charge, the shares purchased will be subject on redemption to the contingent
deferred sales charge, if any, applicable to the purchased shares. See
"Shareholder Services" in the Statement of Additional Information. Dreyfus
Dividend ACHpermits you to transfer electronically dividends or dividends and
capital gain distributions, if any, from the series to a designated bank
account. Only an account maintained at a domestic financial institution which
is an Automated Clearing House member may be so designated. Banks may charge
a fee for this service.
          For more information concerning these privileges or to request a
Dividend Options Form, please call toll free 1-800-645-6561. You may cancel
these privileges by mailing written notification to The Dreyfus Family of
Funds, P.O. Box 9671, Providence, Rhode Island 02940-9671. To select a new
fund after cancellation, you must submit a new Dividend Options Form.
Enrollment in or cancellation of these privileges is effective three business
days following receipt. These privileges are available only for existing
accounts and may not be used to open new accounts. Minimum subsequent
investments do not apply to Dreyfus Dividend Sweep. The Fund may modify or
terminate these privileges at any time or charge a service fee. No such fee
currently is contemplated.
QUARTERLY DISTRIBUTION PLAN _ The Quarterly Distribution Plan permits you to
receive quarterly payments from the Fund consisting of proceeds from the
redemption of shares purchased for your account through the automatic
reinvestment of dividends declared on your account during the preceding
calendar quarter.
          You may open a Quarterly Distribution Plan by submitting a request
to the Transfer Agent. The Quarterly Distribution Plan may be ended at any
time by you, the Fund or the Transfer Agent. Shares for which certificates
have been issued must be presented before redemption under the Quarterly
Distribution Plan.
   

AUTOMATIC WITHDRAWAL PLAN _ The Automatic Withdrawal Plan permits you to
request withdrawal of a specified dollar amount (minimum of $50) on either a
monthly or quarterly basis if you have a $5,000 minimum account. An Automatic
Withdrawal Plan may be established by filing an Automatic Withdrawal Plan
application with the Transfer Agent or by oral request from any of the
authorized signatories on the account by calling 1-800-645-6561. The
Automatic Withdrawal Plan may be ended at any time by you, the Fund or the
Transfer Agent. Shares for which certificates have been issued may not be
redeemed through the Automatic Withdrawal Plan.
    

                              HOW TO REDEEM SHARES
GENERAL
   

          You may request redemption of your shares at any time. Redemption
requests should be transmitted to the Transfer Agent as described below. When
a request is received in proper form by the Transfer Agent or
                            [Page 11]
other entity authorized to receive orders on behalf of the Fund,
the Fund will redeem the shares at the next determined net asset value.
    

          The Fund imposes no charges when shares are redeemed. Securities
dealers, banks and other financial institutions may charge their clients a
fee for effecting redemptions of Fund shares. Any certificates representing
Fund shares being redeemed must be submitted with the redemption request. If
you own shares in both series, any redemption request must clearly state from
which series you wish to redeem the shares. The value of the shares redeemed
may be more or less than their original cost, depending upon the series'
then-current net asset value.
   

          If a request for redemption is received in proper form by the
Transfer Agent by 12:00 Noon, New York time, the proceeds of the redemption,
if transfer by wire is requested, will be transmitted in Federal Funds
ordinarily on the same day and the shares will not receive the dividend
declared on that day. If the request is received later that day by the
Transfer Agent, the shares will receive the dividend declared on that day and
the proceeds of redemption, if wire transfer is requested, will be transmitted
in Federal Funds ordinarily on the next business day.
    

          The Fund ordinarily will make payment for all shares redeemed
within seven days after receipt by the Transfer Agent or the Distributor or
its designee, as the case may be, of a redemption request in proper form,
except as provided by the rules of the Securities and Exchange Commission.
HOWEVER, IF YOU HAVE PURCHASED FUND SHARES BY CHECK OR THROUGH
DREYFUS-AUTOMATIC ASSET BUILDERRegistration Mark AND SUBSEQUENTLY SUBMIT A
WRITTEN REDEMPTION REQUEST TO THE TRANSFER AGENT, YOUR REDEMPTION WILL BE
EFFECTIVE AND THE REDEMPTION PROCEEDS WILL BE TRANSMITTED TO YOU PROMPTLY UPON
BANK CLEARANCE OF YOUR PURCHASE CHECK OR DREYFUS-AUTOMATIC ASSET BUILDER
ORDER, WHICH MAY TAKE UP TO EIGHT BUSINESS DAYS OR MORE. IN ADDITION, THE
FUND WILL NOT HONOR REDEMPTION CHECKS UNDER THE CHECK REDEMPTION PRIVILEGE,
AND WILL REJECT REQUESTS TO REDEEM SHARES BY WIRE OR TELEPHONE, FOR A PERIOD
OF EIGHT BUSINESS DAYS AFTER RECEIPT BY THE TRANSFER AGENT OF THE PURCHASE
CHECK OR THE DREYFUS-AUTOMATIC ASSET BUILDER ORDER AGAINST WHICH SUCH
REDEMPTION IS REQUESTED. THESE PROCEDURES WILL NOT APPLY IF YOUR SHARES WERE
PURCHASED BY WIRE PAYMENT, OR IF YOU OTHERWISE HAVE A SUFFICIENT COLLECTED
BALANCE IN YOUR ACCOUNT TO COVER THE REDEMPTION REQUEST. PRIOR TO THE TIME ANY
REDEMPTION IS EFFECTIVE, DIVIDENDS ON SUCH SHARES WILL ACCRUE AND BE PAYABLE,
AND YOU WILL BE ENTITLED TO EXERCISE ALL OTHER RIGHTS OF BENEFICIAL OWNERSHIP.
Fund shares will not be redeemed until the Transfer Agent has received your
Account Application.
          The Fund reserves the right to redeem your account in either series
at its option on not less than 30 days' written notice if your account's net
asset value is $500 or less and remains so during the notice period.
PROCEDURES
   

          You may redeem shares by using the regular redemption procedure
through the Transfer Agent, or through the Check Redemption Privilege or the
Telephone Redemption Privilege, which are granted automatically unless you
specifically refuse them by checking the applicable "No" box on the Account
Application. The Check Redemption Privilege and the Telephone Redemption
Privilege may be established for an existing account by a separate signed
Shareholder Services Form or, with respect to the Telephone Redemption
Privilege, by oral request from any of the authorized signatories on the
account by calling 1-800-645-6561. You also may redeem shares through the
Wire Redemption Privilege, if you have checked the appropriate box and
supplied the necessary information on the Account Application or have filed a
Shareholder Services Form with the Transfer Agent. The Fund makes available
to certain large institutions the ability to issue redemption instructions
through compatible computer facilities. The Fund reserves the right to refuse
any request made by wire or telephone, including requests made shortly after
a change of address, and may limit the amount involved or the number of such
requests. The Fund may modify or terminate any redemption Privilege at any
time or charge a service fee upon notice to shareholders. No such fee
                            [Page 12]
currently is contemplated. Shares for which certificates have been
issued are not eligible for the Check Redemption, Wire Redemption or
Telephone Redemption Privilege.
    
   
          The Telephone Redemption Privilege or Telephone Exchange Privilege
authorizes the Transfer Agent to act on telephonic instructions (including
over The Dreyfus TouchRegistration Mark automated telephone system) from any
person representing himself or herself to be you, and reasonably believed by
the Transfer Agent to be genuine. The Fund will require the Transfer Agent to
employ reasonable procedures, such as requiring a form of personal
identification, to confirm that instructions are genuine and, if it does not
follow such procedures, the Transfer Agent or the Fund may be liable for any
losses due to unauthorized or fraudulent instructions. Neither the Fund nor
the Transfer Agent will be liable for following telephone instructions
reasonably believed to be genuine.
    

          During times of drastic economic or market conditions, you may
experience difficulty in contacting the Transfer Agent by telephone to
request a redemption or exchange of Fund shares. In such cases, you should
consider using the other redemption procedures described herein. Use of these
other redemption procedures may result in your redemption request being
processed at a later time than it would have been if telephone redemption had
been used.
          REGULAR REDEMPTION _ Under the regular redemption procedure, you
may redeem shares by written request mailed to The Dreyfus Family of Funds,
P.O. Box 9671, Providence, Rhode Island 02940-9671. Redemption requests may
be delivered in person only to a Dreyfus Financial Center. THESE REQUESTS
WILL BE FORWARDED TO THE FUND AND WILL BE PROCESSED ONLY UPON RECEIPT
THEREBY. For the location of the nearest Dreyfus Financial Center, please
call one of the telephone numbers listed under "General Information."
Redemption requests must be signed by each shareholder, including each owner
of a joint account, and each signature must be guaranteed. The Transfer Agent
has adopted standards and procedures pursuant to which signature-guarantees
in proper form generally will be accepted from domestic banks, brokers,
dealers, credit unions, national securities exchanges, registered securities
associations, clearing agencies and savings associations, as well as from
participants in the New York Stock Exchange Medallion Signature Program, the
Securities Transfer Agents Medallion Program ("STAMP"), and the Stock
Exchanges Medallion Program. If you have any questions with respect to
signature-guarantees, please call one of the telephone numbers listed under
"General Information."
          Redemption proceeds of at least $1,000 will be wired to any member
bank of the Federal Reserve System in accordance with a written
signature-guaranteed request.
   

CHECK REDEMPTION PRIVILEGE _ You may write Redemption Checks drawn on your
Fund account. Redemption Checks may be made payable to the order of any
person in the amount of $500 or more. Redemption Checks should not be used to
close your account. Redemption Checks are free, but the Transfer Agent will
impose a fee for stopping payment of a Redemption Check upon your request or
if the Transfer Agent cannot honor a Redemption Check because of insufficient
funds or other valid reason. You should date your Redemption Checks with the
current date when you write them. Please do not postdate your Redemption
Check. If you do, the Transfer Agent will honor, upon presentment, even if
presented before the date of the check, all postdated Redemption Checks which
are dated within six months of presentment for payment, if they are otherwise
in good order. The Check Redemption Privilege is granted automatically unless
you refuse it.
    
   
WIRE REDEMPTION PRIVILEGE _ You may request by wire, telephone or letter
that redemption proceeds (minimum $1,000) be wired to your account at a bank
which is a member of the Federal Reserve System, or a correspondent bank if
your bank is not a member. Holders of jointly registered Fund or bank
accounts may have redemption proceeds of not more than $250,000 wired within
any 30-day period. You may telephone redemption
                            [Page 13]
requests by calling 1-800-645-6561 or, if you are calling from overseas,
call 516-794-5452. The Statement of Additional Information sets forth
instructions for transmitting redemption requests by wire.
    
   
TELEPHONE REDEMPTION PRIVILEGE _ You may request by telephone that
redemption proceeds (maximum $150,000 per day) be paid by check and mailed to
your address. You may telephone redemption instructions by calling
1-800-645-6561 or, if you are calling from overseas, call 516-794-5452. The
Telephone Redemption Privilege is granted automatically unless you refuse it.
    

                            SHAREHOLDER SERVICES PLAN
          The Fund has adopted a Shareholder Services Plan pursuant to which
the Fund reimburses Dreyfus Service Corporation, a wholly-owned subsidiary of
The Dreyfus Corporation, an amount not to exceed an annual rate of .25 of 1%
of the value of each series' average daily net assets for certain allocated
expenses of providing personal services and/or maintaining shareholder
accounts. The services provided may include personal services relating to
shareholder accounts, such as answering shareholder inquiries regarding the
Fund and providing reports and other information, and services related to the
maintenance of shareholder accounts.
                        DIVIDENDS, DISTRIBUTIONS AND TAXES
   

          The Fund ordinarily declares dividends from each series' net
investment income on each day the New York Stock Exchange or, with respect to
the Money Market Series, the Transfer Agent is open for business. Each
series' earnings for Saturdays, Sundays and holidays are declared as
dividends on the preceding business day. Dividends usually are paid on the
last business day of each month, and are automatically reinvested in
additional shares of the series from which they were paid at net asset value
or, at your option, paid in cash. If you redeem all shares in your account at
any time during the month, all dividends to which you are entitled are paid
to you along with the proceeds of the redemption. If you are an omnibus
accountholder and indicate in a partial redemption request that a portion of
any accrued dividends to which such account is entitled belongs to an
underlying accountholder who has redeemed all shares in his or her account,
such portion of the accrued dividends will be paid to you along with the
proceeds of the redemption. Distributions from net realized securities gains,
if any, generally are declared and paid by each series once a year, but the
Fund may make distributions on a more frequent basis to comply with the
distribution requirements of the Internal Revenue Code of 1986, as amended
(the "Code"), in all events in a manner consistent with the provisions of the
1940 Act. The Fund will not make distributions from net realized long-term
securities gains unless capital loss carryovers, if any, have been utilized
or have expired. You may choose whether to receive distributions in cash or
to reinvest in additional shares of the series from which distributions were
paid at net asset value. If you elect to receive dividends and distributions
in cash and your dividend or distribution check is returned to the Fund as
undeliverable or remains uncashed for six months, the Fund reserves the right
to reinvest such dividend or distribution and all future dividends and
distributions payable to you in additional Fund shares at net asset value. No
interest will accrue on amounts represented by uncashed distribution or
redemption checks. All expenses are accrued daily and deducted before
declaration of dividends to investors.
    
   
          Dividends derived from net investment income, together with
distributions from any net realized short-term securities gains and all or a
portion of any gains realized from the sale or other disposition of certain
market discount bonds, paid by a series will be taxable to U.S. shareholders
as ordinary income, whether received in cash or reinvested in additional
shares of the series. No dividend will qualify for the dividends received
deduction allowable to certain U.S. corporations. Distributions from net
realized long-term securities gains of a series will be taxable as long-term
capital gains regardless of how long shareholders have held their shares and
whether such distributions are received in cash or reinvested in additional
shares. The Code provides that an individual generally will be taxed on his
or her net capital gain at a maximum rate of 28%
                            [Page 14]
with respect to capital gain from securities held for more than one
year but not more than 18 months and at a maximum rate of 20% with respect to
capital gain from securities held for more than 18 months.  Dividends and
distributions may be subject to certain state and local taxes.
    

          Dividends derived from net investment income, together with
distributions from net realized short-term securities gains and all or a
portion of any gains realized from the sale or other disposition of certain
market discount bonds, paid by a series to a foreign investor generally are
subject to U.S. nonresident withholding taxes at the rate of 30%, unless the
foreign investor claims the benefit of a lower rate specified in a tax
treaty. Distributions from net realized long-term securities gains paid by a
series to a foreign investor generally will not be subject to U.S.
nonresident withholding tax. However, such distributions may be subject to
backup withholding, as described below, unless the foreign investor certifies
his non-U.S. residency status.
          The exchange of shares of one fund or series for shares of another
fund or series is treated for Federal income tax purposes as a sale of the
shares given in exchange by the shareholder and, therefore, an exchanging
shareholder may realize a taxable gain or loss.
          Notice as to the tax status of your dividends and distributions
will be mailed to you annually. You also will receive periodic summaries of
your account which will include information as to dividends and distributions
from securities gains, if any, paid during the year. Dividends and
distributions attributable to interest from direct obligations of the United
States and paid by a series to individuals currently are not subject to tax
in most states. Dividends and distributions attributable to interest from
other securities in which the series may invest may be subject to state tax.
The Fund intends to provide shareholders with a statement which sets forth
the percentage of dividends and distributions paid by the series that is
attributable to interest income from direct obligations of the United States.
          Federal regulations generally require the Fund to withhold ("backup
withholding") and remit to the U.S. Treasury 31% of dividends and
distributions from net realized securities gains paid to a shareholder if
such shareholder fails to certify either that the TIN furnished in connection
with opening an account is correct, or that such shareholder has not received
notice from the IRS of being subject to backup withholding as a result of a
failure to properly report taxable dividend or interest income on a Federal
income tax return. Furthermore, the IRS may notify the Fund to institute
backup withholding if the IRS determines a shareholder's TIN is incorrect or
if a shareholder has failed to properly report taxable dividend and interest
income on a Federal income tax return.
   

          A TIN is either the Social Security number, IRSindividual taxpayer
identification number or employer identification number of the record owner
of the account. Any tax withheld as a result of backup withholding does not
constitute an additional tax imposed on the record owner of the account, and
may be claimed as a credit on the record owner's Federal income tax return.
    
   
          Management believes that each series of the Fund has qualified for
the fiscal year ended December 31, 1997 as a "regulated investment company"
under the Code. Each series of the Fund intends to continue to so qualify if
such qualification is in the best interests of its shareholders. Such
qualification relieves the series of any liability for Federal income taxes
to the extent its earnings are distributed in accordance with applicable
provisions of the Code. Each series is subject to a non-deductible 4% excise
tax, measured with respect to undistributed amounts of taxable investment
income and capital gains, if any.
    

          You should consult your tax adviser regarding specific questions as
to Federal, state or local taxes.

                            [Page 15]
                           GENERAL INFORMATION
   

          The Fund was incorporated under Maryland law on March l9, 1980. On
April 1, 1982, the Fund began offering shares of the Government Securities
Series, and on May 4, 1982, the Fund began offering shares of the Money
Market Series. On April 27, 1987, the Fund was reorganized as an
unincorporated business trust under the laws of the Commonwealth of
Massachusetts. The Fund is authorized to issue an unlimited number of shares
of beneficial interest, par value $.001 per share. Each share has one vote.
The Fund ordinarily will not hold shareholder meetings; however, shareholders
under certain circumstances may have the right to call a meeting of
shareholders for the purpose of voting to remove Board members.
    

          The Fund is a "series fund," which is a mutual fund divided into
separate portfolios, each of which is treated as a separate entity for
certain matters under the 1940 Act and for other purposes. A shareholder of
one series is not deemed to be a shareholder of any other series. For certain
matters Fund shareholders vote together as a group; as to others they vote
separately by series.
          To date, two series of shares have been authorized. All
consideration received by the Fund for shares of one of the series and all
assets in which such consideration is invested, belong to that series
(subject only to the rights of creditors of the Fund) and will be subject to
the liabilities related thereto. The income attributable to, and the expenses
of, one series are treated separately from those of the other series.
   
    

          The Transfer Agent maintains a record of your ownership and sends
you confirmations and statements of account.
   

          Shareholder inquiries may be made by writing to the Fund at 144
Glenn Curtiss Boulevard, Uniondale, New York 11556-0144, or by calling toll
free 1-800-242-8671. In New York City, call 1-718-895-1396; outside the U.S.,
call 516-794-5452.
    


                            [Page 16]
                                   APPENDIX
INVESTMENT TECHNIQUES
LENDING PORTFOLIO SECURITIES _ The Government Securities Series may lend
securities from its portfolio to brokers, dealers and other financial
institutions needing to borrow securities to complete certain transactions.
The Government Securities Series continues to be entitled to payments in
amounts equal to the interest or other distributions payable on the loaned
securities which affords the series an opportunity to earn interest on the
amount of the loan and on the loaned securities' collateral. Loans of
portfolio securities may not exceed 20% of the value of the Government
Securities Series' total assets, and the series will receive collateral
consisting of cash or U.S. Treasury securities  which will be maintained at
all times in an amount equal to at least 100% of the current market value of
the loaned securities. Such loans are terminable by the Fund at any time upon
specified notice. The Government Securities Series might experience risk of
loss if the institution with which it has engaged in a portfolio loan
transaction breaches its agreement with the Fund.
BORROWING _ Each series may borrow money from banks for temporary or
emergency (not leveraging) purposes in an amount up to 15% of the value of
its total assets (including the amount borrowed) valued at the lesser of cost
or market, less liabilities (not including the amount borrowed) at the time
the borrowing is made. While such borrowings exceed 5% of the value of the
series' total assets, the series will not make any additional investments.
CERTAIN PORTFOLIO SECURITIES
   

U.S. GOVERNMENT SECURITIES _ Securities issued or guaranteed by the U.S.
Government or its agencies or instrumentalities include U.S. Treasury
securities, which differ in their interest rates, maturities and times of
issuance. The Money Market Series and the Government Securities Series may
invest in Treasury Bills, Treasury Notes and Treasury Bonds. In addition, the
Money Market Series may invest in obligations issued or guaranteed by U.S.
Government agencies and instrumentalities. Some obligations issued or
guaranteed by U.S. Government agencies and instrumentalities are supported by
the full faith and credit of the U.S. Treasury; others by the right of the
issuer to borrow from the Treasury; others by discretionary authority of the
U.S. Government to purchase certain obligations of the agency or
instrumentality; and others only by the credit of the agency or
instrumentality. These securities bear fixed, floating or variable rates of
interest. While the U.S. Government currently provides financial support to
such U.S. Government-sponsored agencies or instrumentalities, no assurance
can be given that it will always do so, since it is not so obligated by law.
    

REPURCHASE AGREEMENTS _ In a repurchase agreement, a series buys, and the
seller agrees to repurchase, a security at a mutually agreed upon time and
price (usually within seven days). The repurchase agreement thereby
determines the yield during the purchaser's holding period, while the
seller's obligation to repurchase is secured by the value of the underlying
security. Repurchase agreements could involve risks in the event of a default
or insolvency of the other party to the agreement, including possible delays
or restrictions upon the series' ability to dispose of the underlying
securities. Theseries may enter into repurchase agreements with certain banks
or non-bank dealers.
BANK OBLIGATIONS _ The Money Market Series may purchase certificates of
deposit, time deposits, bankers' acceptances and other short-term obligations
issued by domestic banks, London branches of domestic banks,  and loan
associations and other banking institutions. With respect to such securities
issued by London branches of domestic banks, the Fund may be subject to
additional investment risks that are different in some respects from those
incurred by a fund which invests only in debt obligations of U.S. domestic
issuers. See "Description of the Fund _ Investment Considerations and Risks
_ Foreign Securities."
          Certificates of deposit are negotiable certificates evidencing the
obligation of a bank to repay funds deposited with it for a specified period
of time.

                            [Page 17]
        Time deposits are non-negotiable deposits maintained in a banking
institution for a specified period of time (in no event longer than seven
days) at a stated interest rate.
        Bankers' acceptances are credit instruments evidencing the obligation
of a bank to pay a draft drawn on it by a customer. These instruments reflect
the obligation both of the bank and the drawer to pay the face amount of the
instrument upon maturity. The other short-term obligations may include
uninsured, direct obligations bearing fixed, floating or variable interest
rates.
COMMERCIAL PAPER _ The Money Market Series may purchase commercial paper
consisting of short-term, unsecured promissory notes issued to finance
short-term credit needs. The commercial paper purchased by the Money Market
Series will consist only of direct obligations issued by domestic and foreign
entities. The other corporate obligations in which the Money Market Series
may invest consist of high quality, U.S. dollar denominated short-term bonds
and notes (including variable amount master demand notes) issued by domestic
and foreign corporations, including banks.
FLOATING AND VARIABLE RATE OBLIGATIONS _ The Money Market Series may
purchase floating and variable rated demand notes and bonds, which are
obligations ordinarily having stated maturities in excess of 13 months, but
which permit the holder to demand payment of principal any time, or at
specified intervals not exceeding 13 months, in each case upon not more than
30 days' notice. Variable rate demand notes include master demand notes which
are obligations that permit the Money Market Series to invest fluctuating
amounts, at varying rates of interest, pursuant to direct arrangements
between the Money Market Series, as lender, and the borrower. These
obligations permit daily changes in the amounts borrowed. Because these
obligations are direct lending arrangements between the lender and borrower,
it is not contemplated that such instruments generally will be traded, and
there generally is no established secondary market for these obligations,
although they are redeemable at face value, plus accrued interest.
Accordingly, where these obligations are not secured by letters of credit or
other credit support arrangements, the Money Market Series' right to redeem
is dependent on the ability of the borrower to pay principal and interest on
demand.
   

ILLIQUID SECURITIES _ Each series may invest up to 10% of the value of its
net assets in securities as to which a liquid trading market does not exist,
provided such investments are consistent with the series' investment
objective. Such securities may include securities that are not readily
marketable, such as certain securities that are subject to legal or
contractual restrictions on resale, and repurchase agreements providing for
settlement in more than seven days after notice. As to these securities, the
series is subject to the risk that should the series desire to sell them when
a ready buyer is not available at a price the Fund deems representative of
their value, the value of the series' net assets could be adversely affected.
    

        NO PERSON HAS BEEN AUTHORIZED TO GIVE ANY INFORMATION OR TO MAKE ANY
REPRESENTATIONS OTHER THAN THOSE CONTAINED IN THIS PROSPECTUS AND IN THE
FUND'S OFFICIAL SALES LITERATURE IN CONNECTION WITH THE OFFER OF THE FUND'S
SHARES, AND, IF GIVEN OR MADE, SUCH OTHER INFORMATION OR REPRESENTATIONS MUST
NOT BE RELIED UPON AS HAVING BEEN AUTHORIZED BY THE FUND. THIS PROSPECTUS
DOES NOT CONSTITUTE AN OFFER IN ANY STATE IN WHICH, OR TO ANY PERSON TO WHOM,
SUCH OFFERING MAY NOT LAWFULLY BE MADE.

                            [Page 18]
[This Page Intentionally Left Blank]
                            [Page 19]

____________________________________________________________________________


                   DREYFUS INSTITUTIONAL MONEY MARKET FUND
                                   PART B
                    (STATEMENT OF ADDITIONAL INFORMATION)
   
                                 MAY 1, 1998
    
____________________________________________________________________________


     This Statement of Additional Information, which is not a prospectus,
supplements and should be read in conjunction with the current Prospectus of
Dreyfus Institutional Money Market Fund (the "Fund"), dated May 1, 1998, as
it may be revised from time to time. To obtain a copy of the Fund's
Prospectus, please write to the Fund at 144 Glenn Curtiss Boulevard,
Uniondale, New York 11556-0144, or call the following numbers:
   

                    Call Toll Free -- 1-800-645-6561
                    In New York City -- Call 1-718-895-1396
                    Outside the U.S. -- Call 516-794-5452
    

     The Dreyfus Corporation (the "Manager") serves as the Fund's investment
adviser.

     Premier Mutual Fund Services, Inc. (the "Distributor") is the
distributor of the Fund's shares.

                       TABLE OF CONTENTS
                                                            Page
   

Investment Objective and Management Policies                B-2
Management of the Fund                                      B-5
Management Agreement                                        B-10
Purchase of Shares                                          B-12
Shareholder Services Plan                                   B-14
Redemption of Shares                                        B-14
Shareholder Services                                        B-16
Portfolio Transactions                                      B-18
Determination of Net Asset Value                            B-19
Dividends, Distributions and Taxes                          B-20
Yield Information                                           B-20
Information About the Fund                                  B-21
Transfer and Dividend Disbursing Agent, Custodian,
     Counsel and Independent Auditors                       B-22
Financial Statements and Report of Independent Auditors     B-22
Appendix                                                    B-23
    


          INVESTMENT OBJECTIVE AND MANAGEMENT POLICIES

     The following information supplements and should be read in conjunction
with the sections in the Fund's Prospectus entitled "Description of the
Fund" and "Appendix."

Portfolio Securities

     Bank Obligations.  (Money Market Series only)  Investments in time
deposits and certificates of deposit are limited to domestic banks having
total assets in excess of $1 billion and London branches of such domestic
banks.

     Both domestic banks and London branches of domestic banks are subject
to extensive but different governmental regulations which may limit both the
amount and types of loans which may be made and interest rates which may be
charged.  In addition, the profitability of the banking industry is
dependent largely upon the availability and cost of funds for the purpose of
financing lending operations under prevailing money market conditions.
General economic conditions as well as exposure to credit losses arising
from possible financial difficulties of borrowers play an important part in
the operations of the banking industry.

       Domestic commercial banks organized under Federal law are supervised
and  examined by the Comptroller of the Currency and are required to be
members of the Federal Reserve System and to have their deposits insured by
the Federal Deposit Insurance Corporation.  Domestic banks organized under
state law are supervised and examined by state banking authorities but are
members of the Federal Reserve System only if they elect to join.  As a
result of Federal and state laws and regulations, domestic banks are, among
other things, generally required to maintain specified levels of reserves
and are subject to other regulations designed to promote financial
soundness.  However, not all of such laws and regulations apply to the
London branches of domestic banks.

     Foreign Government Obligations.  (Money Market Series only) The Money
Market Series may invest in obligations issued or guaranteed by one or more
foreign governments or any of their political subdivisions, agencies or
instrumentalities that are determined by the Manager to be of comparable
quality to the other obligations in which the Money Market Series may
invest.  Such securities also include debt obligations of supranational
entities.  Supranational entities include international organizations
designated or supported by governmental entities to promote economic
reconstruction or development and international banking institutions and
related government agencies.  Examples include the International Bank for
Reconstruction and Development (the World Bank), the European Coal and Steel
Community, the Asian Development Bank and the InterAmerican Development
Bank.

     Repurchase Agreements.  The Fund's custodian or sub-custodian will have
custody of, and will hold in a segregated account, securities acquired by
the series under a repurchase agreement.  Repurchase agreements are
considered by the staff of the Securities and Exchange Commission to be
loans by the series which enters into them.  In an attempt to reduce the
risk of incurring a loss on a repurchase agreement, the series will enter
into repurchase agreements only with domestic banks with total assets in
excess of $1 billion, or primary government securities dealers reporting to
the Federal Reserve Bank of New York, with respect to securities of the type
in which the series may invest or government securities regardless of their
remaining maturities, and will require that additional securities be
deposited with it if the value of the securities purchased should decrease
below resale price.

     Illiquid Securities.  Where a substantial market of qualified
institutional buyers develops for certain restricted securities purchased by
the series pursuant to Rule 144A under the Securities Act of 1933, as
amended, the Fund intends to treat such securities as liquid securities in
accordance with procedures approved by the Fund's Board.  Because it is not
possible to predict with assurance how the market for restricted securities
pursuant to Rule 144A will develop, the Fund's Board has directed the
Manager to monitor carefully the series' investments in such securities with
particular regard to trading activity, availability of reliable price
information and other relevant information.  To the extent that, for a
period of time, qualified institutional buyers cease purchasing restricted
securities pursuant to Rule 144A, a series' investing in such securities may
have the effect of increasing the level of illiquidity in the series'
portfolio during such period.

Management Policies

     Lending Portfolio Securities.  (Government Securities Series only) In
connection with its securities lending transactions, the Government
Securities Series may return to the borrower or a third party which is
unaffiliated with the Fund, and which is acting as a "placing broker," a
part of the interest earned from the investment of collateral received for
securities loaned.

     The Securities and Exchange Commission currently requires that the
following conditions must be met whenever portfolio securities are loaned:
(1) the series must receive at least 100% cash collateral from the borrower;
(2) the borrower must increase such collateral whenever the market value of
the securities rises above the level of such collateral; (3) the series must
be able to terminate the loan at any time; (4) the series must receive
reasonable interest on the loan, as well as any interest or other
distributions payable on the loaned securities, and any increase in market
value; and (5) the series may pay only reasonable custodian fees in
connection with the loan.

Investment Restrictions

     The Fund has adopted investment restrictions numbered 1 through 10,
with respect to each series, and investment restrictions numbered 12 and 13,
with respect to the Money Market Series only, as fundamental policies, which
cannot be changed, as to a series, without approval by the holders of a
majority (as defined in the Investment Company Act of 1940, as amended (the
"1940 Act")) of the outstanding voting shares of such series.  Investment
restriction number 11 is not a fundamental policy and may be changed, as to
a series, by vote of a majority of the Fund's Board members at any time.
Neither series may:

     1.   Purchase common stocks, preferred stocks, warrants, other equity
securities, corporate bonds or debentures, state bonds, municipal bonds or
industrial revenue bonds.

     2.   Borrow money, except from banks for temporary or emergency (not
leveraging) purposes, in an amount up to 15% of the value of a series' total
assets (including the amount borrowed) based on the lesser of cost or
market, less liabilities (not including the amount borrowed) at the time the
borrowing is made.  While borrowings exceed 5% of the value of the series'
total assets, the series will not make any additional investments.

     3.   Pledge, hypothecate, mortgage or otherwise encumber its assets
except in an amount up to 15% of the value of its total assets but only to
secure borrowings for temporary or emergency purposes.

     4.   Sell securities short or purchase securities on margin.

     5.   Write or purchase put or call options.

     6.   Underwrite the securities of other issuers.

     7.   Purchase or sell real estate, real estate investment trust
securities, commodities, or oil and gas interests.

     8.   Make loans to others, except through the purchase of debt
obligations and through repurchase agreements referred to in the Prospectus.
However, the Government Securities Series may lend securities to brokers,
dealers and other institutional investors, but only when the borrower
deposits collateral consisting of cash or U.S. Treasury securities with the
Government Securities Series and agrees to maintain such collateral so that
it amounts at all times to at least 100% of the value of the securities
loaned.  Such loans will not be made if, as a result, the aggregate value of
the securities loaned exceeds 20% of the value of the Government Securities
Series' total assets.

     9.   Invest in companies for the purpose of exercising control.

     10.  Invest in securities of other investment companies, except as they
may be acquired as part of a merger, consolidation or acquisition of assets.

     11.  Enter into repurchase agreements providing for settlement in more
than seven days after notice or purchase securities which are illiquid if,
in the aggregate, more than 10% of the value of the series' net assets would
be so invested.

     The following investment restrictions numbered 12 and 13, which are
fundamental policies, apply only to the Money Market Series.  The Money
Market Series may not:

     12.  Invest more than 15% of its assets in the obligations of any one
bank, or invest more than 5% of its assets in the commercial paper of any
one issuer.  Notwithstanding the foregoing, to the extent required by the
rules of the Securities and Exchange Commission, the Money Market Series
will not invest more than 5% of its assets in the obligations of any one
bank.

     13.  Invest less than 25% of its assets in obligations issued by banks
or invest more than 25% of its assets in the securities of issuers in any
other industry, provided that there shall be no limitation on the purchase
of obligations issued or guaranteed by the U.S. Government, its agencies or
instrumentalities.  Notwithstanding the foregoing, if at some future date
available yields on bank securities are significantly lower than yields on
other securities in which the Money Market Series may invest, the Money
Market Series may invest less than 25% of its assets in bank obligations.

     If a percentage restriction is adhered to at the time of investment, a
later increase or decrease in percentage resulting from a change in values
or assets will not constitute a violation of such restriction.

     The Fund may make commitments more restrictive than the restrictions
listed above so as to permit the sale of series' shares in certain states.
Should the Fund determine that a commitment is no longer in the best
interest of a series and its shareholders, the Fund reserves the right to
revoke the commitment by terminating the sale of such series' shares in the
state involved.


                     MANAGEMENT OF THE FUND
   

     Board members and officers of the Fund, together with information as to
their principal business occupations during at least the last five years,
are shown below.
    

Board Members of the Fund
   

JOSEPH S. DiMARTINO, Chairman of the Board.  Since January 1995, Chairman of
     the Board of various funds in the Dreyfus Family of Funds.  He is a
     director, and from February 1995 until November 1997 was Chairman of
     the Board of Noel Group, Inc., a venture capital company.  He is also a
     director of The Muscular Dystrophy Association, HealthPlan Services
     Corporation, a provider of marketing, administrative and risk
     management services to health and other benefit programs, Carlyle
     Industries, Inc. (formerly, Belding Heminway Company, Inc., a button
     packager and distributor, Century Business Services, Inc., a provider
     of various outsourcing functions for small and medium sized companies,
     and Staffing Resources, Inc., a temporary placement firm.  For more
     than five years prior to January 1995, he was President, a director
     and, until August 1994, Chief Operating Officer of the Manager and
     Executive Vice President and a director of Dreyfus Service Corporation,
     a wholly-owned subsidiary of the Manager and, until August 24, 1994,
     the Fund's distributor.  From August 1994 to December 31, 1994, he was
     a director of Mellon Bank Corporation.  Mr. DiMartino is 54 years old
     and his address is 200 Park Avenue, New York, New York 10166.
    
   
DAVID P. FELDMAN, Board Member.  A trustee of Corporate Property Investors,
     a real estate investment company, and a director of several mutual
     funds in the 59 Wall Street Mutual Funds Group, and of the Jeffrey
     Company, a private investment company.  He was employed by AT&T from
     July 1961 to his retirement in April 1997, most recently serving as
     Chairman and Chief Executive Officer of AT&T Investment Management
     Corporation.  Mr. Feldman is 58 years old and his address is c/o AT&T,
     One Oak Way, Berkley Heights, New Jersey 07922.
    
   
JOHN M. FRASER, JR., Board Member.  President of Fraser Associates, a
     service company for planning and arranging corporate meetings and other
     events.  From September 1975 to June 1978, he was Executive Vice
     President of Flagship Cruises, Ltd.  Prior thereto, he was Senior Vice
     President and Resident Director of the Swedish-American Line for the
     United States and Canada.  Mr. Fraser is 76 years old and his address
     is 133 East 64th Street, New York, New York 10021.
    
   
ROBERT R. GLAUBER, Board Member.  Research Fellow, Center for Business and
     Government at the John F. Kennedy School of Government, Harvard
     University since January 1992.  He was Under Secretary of the Treasury
     for Finance at the U.S. Treasury Department from May 1989 to January
     1992.  For more than five years prior thereto, he was a Professor of
     Finance at the Graduate School of Business Administration of Harvard
     University and, from 1985 to 1989, Chairman of its Advanced Management
     Program.  He is also a director of Mid Ocean Reinsurance Co., Ltd.,
     Cooke & Bieler, investment counselors, NASD, Inc. and the Federal
     Reserve Bank of Boston.  Mr. Glauber is 58 years old and his address is
     79 John F. Kennedy Street, Cambridge, Massachusetts 02138.
    
   
JAMES F. HENRY, Board Member.  President of the CPR Institute for Dispute
     Resolution, a non-profit organization principally engaged in the
     development of alternatives to business litigation.  He was of counsel
     to the law firm of Lovejoy, Wasson & Ashton from October 1975 to
     December 1976 and from October 1979 to June 1983, and was a partner of
     that firm from January 1977 to September 1979.  He was President and a
     director of the Edna McConnell Clark Foundation, a philanthropic
     organization from September 1971 to December 1976.  Mr. Henry is 67
     years old and his address is c/o CPR Institute for Dispute Resolution,
     366 Madison Avenue, New York, New York 10017.
    

ROSALIND GERSTEN JACOBS, Board Member.  Director of Merchandise and
     Marketing,  Corporate Property Investors, a real estate investment
     company.  From 1974 to 1976, she was owner and manager of a merchandise
     and marketing consulting firm.  Prior to 1974, she was a Vice President
     of Macy's, New York.  Mrs. Jacobs is 71 years old and her address is
     c/o Corporate Property Investors, 305 East 47th Street, New York, New
     York 10017.
   

IRVING KRISTOL, Board Member.  John M. Olin Distinguished Fellow of the
     American Enterprise Institute for Public Policy Research, co-editor of
     The Public Interest magazine, and an author or co-editor of several
     books.  From May 1981 to December 1994, he was a consultant to the
     Manager on economic matters; from 1969 to 1988, he was Professor of
     Social Thought at the Graduate School of Business Administration, New
     York University; from September 1969 to August 1979, he was Henry R.
     Luce Professor of Urban Values at New York University; from 1975 to
     1990, he was a director of Lincoln National Corporation, an insurance
     company; and from 1977 to 1990, he was a director of Warner-Lambert
     Company, a pharmaceutical and consumer products company.  Mr. Kristol
     is 78 years old and his address is c/o The Public Interest, 1112 16th
     Street, N.W., Suite 530, Washington, D.C. 20036.
    
   
DR. PAUL A. MARKS, Board Member.  President and Chief Executive Officer of
     Memorial Sloan-Kettering Cancer Center.  He was Vice President for
     Health Sciences and director of the Cancer Center at Columbia
     University from 1973 to 1980, and Professor of Medicine and of Human
     Genetics and Development at Columbia University from 1968 to 1982.  He
     was a director of Pfizer, Inc., a pharmaceutical company, from 1978 to
     1996 and Life Technologies, Inc., a life science company providing
     products for cell and molecular biology and microbiology from 1986 to
     1996.  He is a director of  Tulerik, Inc., a biotechnology company,
     Genos, Inc., a genomics company, and a general partner of LINC Venture
     Lease Partners II, L.P., a limited partnership engaged in leasing.  Dr.
     Marks is 71 years old and his address is c/o Memorial Sloan-Kettering
     Cancer Center, 1275 York Avenue, New York, New York 10021.
    
   
DR. MARTIN PERETZ, Board Member.  Editor-in-Chief of The New Republic
     magazine and a lecturer in Social Studies at Harvard University where
     he has been a member of the faculty since 1965.  He is a trustee of The
     Center for Blood Research at the Harvard Medical School and the Academy
     for Liberal Education, an accrediting agency for colleges and
     universities certified by the U.S. Department of Education; and a
     director of Leukosite Inc., a biopharmaceutical company.  Dr. Peretz is
     also Co-Chairman of TheStreet.com, a financial daily on the Web.  From
     1988 to 1991, he was a director of Carmel Container Corporation.  Dr.
     Peretz is 57 years old and his address is c/o  The New Republic, 1220
     19th Street, N.W., Washington, D.C. 20036.
    

BERT W. WASSERMAN, Board Member.  Financial Consultant.  From January 1990
     to March 1995, Executive Vice President and Chief Financial Officer,
     and from January 1990 to March 1993 a director, of Time Warner Inc.;
     from 1981 to 1990, he was a member of the office of the President and a
     director of Warner Communications Inc. He is also a director of The New
     Germany Fund, Mountasia Entertainment International, Inc., the Lillian
     Vernon Corporation, Winstar Communications, Inc. and International
     Discount Telecommunications Corp.  Mr. Wasserman is 64 years old and
     his address is 126 East 57th Street, Suite 12 North, New York, New York
     10022-3613.

     No further shareholder meetings will be held for the purpose of
electing Board members unless and until such time as less than a majority of
the Board members holding office have been elected by shareholders, at which
time the Board members then in office will call a shareholders' meeting for
the election of Board members.  Under the Act, shareholders of record of not
less than two-thirds of the outstanding shares of the Fund may remove a
Board member through a declaration in writing or by vote cast in person or
by proxy at a meeting called for that purpose.  Board members are required
to call a meeting of shareholders for the purpose of voting upon the
question of removal of any such Board member when requested in writing to do
so by the shareholders of record of not less than 10% of the Fund's
outstanding shares.

     For as long as the Fund's plan described in the section captioned
"Shareholder Services Plan" remains in effect, the Board members of the Fund
who are not "interested persons" of the Fund, as defined in the 1940 Act,
will be selected and nominated by the Board Members who are not "interested
persons" of the Fund.
   

     The Fund typically pays its Board members an annual retainer and a per
meeting fee and reimburses them for their expenses.  The Chairman of the
Board receives an additional 25% of such compensation.  Emeritus Board
members are entitled to receive an annual retainer and a per meeting fee of
one-half the amount paid to them as Board members.  The aggregate amount of
compensation paid to each Board member by the Fund and by all other funds in
the Dreyfus Family of Funds for which such person is a Board member (the
number of which is set forth in parenthesis next to each Board member's
total compensation) for the year ended December 31, 1997, were as follows:
    


                                                     Total
                                                 Compensation from
                            Aggregate            Fund and Fund
    Name of Board           Compensation from    Complex Paid to
       Member                Fund*               Board Members
   

Joseph S. DiMartino           $ 8,750             $597,128 (93)

David P. Feldman              $ 7,000             $129,375 (37)

John M. Fraser, Jr.           $ 7,000             $ 76,750 (14)

Robert R. Glauber             $ 7,000             $102,500 (20)

James F. Henry                $ 7,000             $ 57,500 (10)

Rosalind Gersten Jacobs       $ 7,000             $ 95,250 (20)

Irving Kristol                $ 7,000             $ 57,500 (10)

Dr. Paul A. Marks             $ 7,000             $ 57,500 (10)

Dr. Martin Peretz             $ 7,000             $ 57,500 (10)

Bert W. Wasserman             $ 7,000             $ 56,000 (10)
_______________________
*    Amount does not include reimbursed expenses for attending Board
     meetings, which amounted to $1,594 for all Board members as a group.
    

Officers of the Fund
   

MARIE E. CONNOLLY, President and Treasurer.  President, Chief Executive
     Officer, Chief Compliance Officer and a director of the Distributor and
     Funds Distributor, Inc., the ultimate parent of which is Boston
     Institutional Group, Inc., and an officer of other investment companies
     advised or administered by the Manager.  She is 40 years old.
    
   
MICHAEL S. PETRUCELLI, Vice President, Assistant Treasurer and Assistant
     Secretary.  Senior Vice President of Funds Distributor, Inc., and an
     officer of other investment companies advised or administered by the
     Manager.  From December 1989 through November 1996, he was employed
     with GE Investments where he held various financial, business
     development and compliance positions.  He also served as Treasurer of
     the GE Funds and as a Director of GE Investment Services.  He is 36
     years old.
    
   
RICHARD INGRAM, Vice President and Assistant Treasurer.  Executive Vice
     President of the Distributor and Funds Distributor, Inc., and an
     officer of other investment companies advised or administered by the
     Manager.  From March 1994 to November 1995, he was Vice President and
     Division Manager for First Data Investor Services Group.  From 1989 to
     1995, he was Vice President, Assistant Treasurer and Tax Director -
     Mutual Funds of The Boston Company, Inc.  He is 41 years old.
    
   
MARY A. NELSON, Vice President and Assistant Treasurer. Vice President of
     the Distributor and Funds Distributor, Inc., and an officer of other
     investment companies advised or administered by the Manager.  From
     September 1989 to July 1994, she was an Assistant Vice President and
     Client Manager for The Boston Company, Inc.  She is 33 years old.
    
   
JOSEPH F. TOWER, III, Vice President and Assistant Treasurer.  Senior Vice
     President, Treasurer, Chief Financial Officer and a director of the
     Distributor and Funds Distributor, Inc., and an officer of other
     investment companies advised or administered by the Manager.  From July
     1988 to August 1994, he was employed by The Boston Company, Inc. where
     he held various management positions in the Corporate Finance and
     Treasury areas.  He is 35 years old.
    
   
DOUGLAS C. CONROY, Vice President and Assistant Secretary.  Assistant Vice
     President of Funds Distributor, Inc., and an officer of other
     investment companies advised or administered by the Manager.  From
     April 1993 to January 1995, he was a Senior Fund Accountant for
     Investors Bank & Trust Company.  From December 1991 to March 1993, he
     was employed as a Fund Accountant at The Boston Company, Inc.  He is 28
     years old.
    
   
CHRISTOPHER J. KELLEY, Vice President and Assistant Secretary.  Vice
     President and Senior Associate General Counsel of Funds Distributor,
     Inc., and an officer of other investment companies advised or
     administered by the Manager.  From April 1994 to July 1996, he was
     Assistant Counsel at Forum Financial Group.  From October 1992 to March
     1994, he was employed by Putnam Investments in legal and compliance
     capacities.  He is 33 years old.
    
   
KATHLEEN K. MORRISEY, Vice President and Assistant Secretary.  Manager of
     Treasury Services Administration of Funds Distributor, Inc. and an
     officer of other investment companies advised or administered by the
     Manager.  From July 1994 to November 1995, she was a Fund Accountant
     for Investors Bank & Trust Company.  She is 25 years old.
    
   
ELBA VASQUEZ, Vice President and Assistant Secretary.  Assistant Vice
     President of Funds Distributor, Inc. and an officer of other investment
     companies advised or administered by the Manager.  From March 1990 to
     May 1996, she was employed by U.S. Trust Company of New York where she
     held various sales and marketing positions.  She is 36 years old.
    

     The address of each officer of the Fund is 200 Park Avenue, New York,
New York 10166.
   

     The Fund's Board members and officers, as a group, owned less than 1%
of the Fund's shares of outstanding on April 13, 1998.
    
   
     The following are known by the Fund to own of record or beneficially,
5% or more of the outstanding voting securities of the indicated series.
Money Market Series: Hare & Co. c/o The Bank of New York, Attn:  Special
Process Department, One Wall Street, New York, NY 10286 - 6.01%.  Government
Securities Series:  Cudd & Co., Chase Manhattan Bank, 1211 Avenue of
Americas, New York, NY 10036 - 31.08%; Iovine Family Revocable Trust, c/o
CB&G, 1990 S. Bundy Dr., Los Angeles, CA 90025 - 14.18%; Chase Manhattan
Bank, Client Services, 1211 Avenue of the Americas, New York, NY 10036 -
10.35%; The Bear Stearns Companies, Inc., Profit Sharing Plan, Profit
Sharing Account, 155 S. Jefferson Road, Whippany, NJ 07981 - 6.51%;
Fiduciary Trust Co. International Customers Account, P.O. Box 3199, New York
NY 10008 - 6.05%.  A shareholder who beneficially owns, directly or
indirectly, more than 25% of a series' voting securities may be deemed a
"Control Person" (as defined in the 1940 Act) of that series.
    


                      MANAGEMENT AGREEMENT

     The following information supplements and should be read in conjunction
with the section in the Fund's Prospectus entitled "Management of the Fund."
   

     The Manager provides management services pursuant to the Management
Agreement (the "Agreement") dated August 24, 1994 with the Fund.  As to each
series, the Agreement is subject to annual approval by (i) the Fund's Board
or (ii) vote of a majority (as defined in the 1940 Act) of the outstanding
voting securities of such series, provided that in either event the
continuance also is approved by a majority of the Board members who are not
"interested persons" (as defined in the 1940 Act) of the Fund or the
Manager, by vote cast in person at a meeting called for the purpose of
voting on such approval.  Shareholders approved the Agreement on August 2,
1994.  The Fund's Board, including a majority of the Board members who are
not "interested persons" of any party to the Agreement, last voted to renew
the Agreement at a meeting held on March 9, 1998.  As to each series, the
Agreement is terminable without penalty on 60 days' notice by the Fund's
Board or by vote of a majority of the outstanding voting securities of such
series or, on 90 days' notice, by the Manager.  The Agreement will terminate
automatically, as to the relevant series, in the event of its assignment (as
defined in the 1940 Act).
    
   
     The following persons are officers and/or directors of the Manager:  W.
Keith Smith, Chairman of the Board; Christopher M. Condron, President, Chief
Executive Officer, Chief Operating Officer and a director; Stephen E.
Canter, Vice Chairman, Chief Investment Officer and a director; Lawrence S.
Kash, Vice Chairman--Distribution and a director; Ronald P. O'Hanley III,
Vice Chairman; J. David Officer, Vice Chairman; William T. Sandalls, Jr.,
Senior Vice President and Chief Financial Officer; Mark N. Jacobs, Vice
President, General Counsel and Secretary; Patrice M. Kozlowski, Vice
President--Corporate Communications; Mary Beth Leibig, Vice President--Human
Resources; Jeffrey N. Nachman, Vice President--Mutual Fund Accounting;
Andrew S. Wasser, Vice President--Information Services; William V. Healey,
Assistant Secretary; and Mandell L. Berman, Burton C. Borgelt, Frank V.
Cahouet and Richard F. Syron, directors.
    
   
     The Manager manages the Fund's portfolio of investments in accordance
with the stated policies of the Fund, subject to the approval of the Fund's
Board.  The Manager is responsible for investment decisions and provides the
Fund with portfolio managers who are authorized by the Board to execute
purchases and sales of securities.  The Fund's portfolio managers are
Bernard W. Kiernan, Jr., Patricia A. Larkin and Thomas Riordan.  The Manager
also maintains a research department with a professional staff of portfolio
managers and securities analysts who provide research services for the Fund
as well as for other funds advised by the Manager.
    

     The Manager maintains office facilities, on behalf of the Fund, and
furnishes statistical and research data, clerical help, accounting, data
processing, bookkeeping and internal auditing services, and certain other
required services to the Fund.  The Manager may make such advertising and
promotional expenditures, using its own resources, as it from time to time
deems appropriate.

     All expenses incurred in the operation of the Fund are borne by the
Fund, except to the extent specifically assumed by the Manager.  The
expenses borne by the Fund include:  taxes, interest, brokerage fees and
commissions, if any, fees of Board members who are not officers, directors,
employees, or holders of 5% or more of the outstanding voting securities of
the Manager, Securities and Exchange Commission fees, state Blue Sky
qualification fees, advisory fees, charges of registrars and custodians,
transfer and dividend disbursing agents' fees, outside auditing and legal
expenses, costs of independent pricing services, costs of maintaining the
Fund's existence, all costs of insurance obtained other than under a blanket
policy covering one or more other investment companies managed by the
Manager, costs attributable to investor services (including, allocable
telephone and personnel expenses), costs of shareholders' reports and
meetings, costs of preparing and printing prospectuses for regulatory
purposes and for distribution to existing shareholders and any extraordinary
expenses.  Expenses attributable to a particular series are charged against
the assets of that series; other expenses of the Fund are allocated between
the series on the basis determined by the Board members, including, but not
limited to, proportionately in relation to the net assets of each series.
   

     As compensation for the Manager's services, the Fund has agreed to pay
the Manager a monthly management fee at the annual rate of .50 of 1% of the
value of each series' average daily net assets.  All expenses are accrued
daily and deducted before declaration of dividends to investors.  The
management fees paid by the Money Market Series to the Manager for the
fiscal years ended December 31, 1995, 1996 and 1997 amounted to $1,732,707,
$2,208,098 and $2,597,609, respectively.  The management fees paid by the
Government Securities Series to the Manager for the fiscal years ended
December 31, 1995, 1996 and 1997 amounted to $770,698, $761,707 and
$754,470, respectively.
    

     The Manager has agreed that if in any fiscal year the aggregate
expenses of the Fund, exclusive of taxes, brokerage commissions, interest
and (with the prior written consent of the necessary state securities
commissions) extraordinary expenses, but including the management fee,
exceed 1% of the value of the average net assets of either series for the
year, the Fund may deduct from the management fees charged to the series or
the Manager will bear such excess amount.

     The aggregate of the fees payable to the Manager is not subject to
reduction as the value of a series' net assets increases.


                       PURCHASE OF SHARES

     The following information supplements and should be read in conjunction
with the section in the Fund's Prospectus entitled "How to Buy Shares."
   

     The Distributor.  The Distributor serves as the Fund's distributor on a
best efforts basis pursuant to an agreement which is renewable annually.
The Distributor also acts as distributor for the other funds in the Dreyfus
Family of Funds and for certain other investment companies.
    

     Using Federal Funds.  Dreyfus Transfer, Inc., the Fund's transfer and
dividend disbursing agent (the "Transfer Agent"), or the Fund may attempt to
notify the investor upon receipt of checks drawn on banks that are not
members of the Federal Reserve System as to the possible delay in conversion
into Federal Funds and may attempt to arrange for a better means of
transmitting the money.  If the investor is a customer of a securities
dealer, bank or other financial institution and his order to purchase Fund
shares is paid for other than in Federal Funds, the securities dealer, bank
or other financial institution, acting on behalf of its customer, will
complete the conversion into, or itself advance, Federal Funds generally on
the business day following receipt of the customer order.  The order is
effective only when so converted and received by the Transfer Agent.  An
order for the purchase of Fund shares placed by an investor with a
sufficient Federal Funds or cash balance in his brokerage account with a
securities dealer, bank or other financial institution will become effective
on the day that the order, including Federal Funds, is received by the
Transfer Agent.

     Procedures for Multiple Accounts.  The Transfer Agent will provide each
institution with a written confirmation for each transaction in a
sub-account.  Duplicate confirmations may be transmitted to the beneficial
owner of the sub-account at no additional charge.  Upon receipt of funds for
investment by interbank wire, the Transfer Agent or First Interstate Bank of
California will promptly confirm the receipt of the investment by telephone
or return wire to the transmitting bank, if the investor so requests.

     The Transfer Agent also will provide each institution with a monthly
statement setting forth, for each sub-account, the share balance, income
earned for the month, income earned for the year to date and the total
current value of the account.

     Transactions Through Securities Dealers.  Fund shares may be purchased
and redeemed through securities dealers who may charge a fee for such
services.  Some dealers will place the Fund's shares in an account with
their firm.  Dealers also may require that the customer not take physical
delivery of share certificates; the customer not request redemption checks
to be issued in the customer's name; fractional shares not be purchased;
monthly income distributions be taken in cash; or other conditions.

     There is no sales or service charge by the Fund or the Distributor
although investment dealers, banks and other financial institutions may make
reasonable charges to investors for their services.  The services provided
and the applicable fees are established by each dealer or other institution
acting independently of the Fund.  The Fund has been given to understand
that these fees may be charged for customer services including, but not
limited to, same-day investment of client funds; same-day access to client
funds; advice to customers about the status of their accounts, yield
currently being paid or income earned to date; provision of periodic account
statements showing security and money market positions; other services
available from the dealer, bank or other institution; and assistance with
inquiries related to their investment.  Any such fees will be deducted
monthly from the investor's account, which on smaller accounts could
constitute a substantial portion of distributions.  Small, inactive,
long-term accounts involving monthly service charges may not be in the best
interest of investors.  Investors should be aware that they may purchase
shares of the Fund directly from the Fund without imposition of any
maintenance or service charges, other than those already described herein.

     Reopening an Account.  An investor may reopen an account with a minimum
investment of $100 without filing a new Account Application during the
calendar year the account is closed or during the following calendar year,
provided the information on the old Account Application is still applicable.


                   SHAREHOLDER SERVICES PLAN

     The following information supplements and should be read in conjunction
with the section in the Fund's Prospectus entitled "Shareholder Services
Plan."

     The Fund has adopted a Shareholder Services Plan (the "Plan") pursuant
to which the Fund reimburses Dreyfus Service Corporation for certain
allocated expenses of providing personal services and/or maintaining
shareholder accounts.  The services provided may include personal services
relating to shareholder accounts, such as answering shareholder inquiries
regarding the Fund and providing reports and other information, and services
related to the maintenance of shareholder accounts.
   

     A quarterly report of the amounts expended under the Plan, and the
purposes for which such expenditures were incurred, must be made to the
Board for its review.  In addition, the Plan provides that material
amendments of the Plan must be approved by the Board, and by the Board
members who are not "interested persons" (as defined in the 1940 Act) of the
Fund and have no direct or indirect financial interest in the operation of
the Plan by vote cast in person at a meeting called for the purpose of
considering such amendments.  The Plan is subject to annual approval by such
vote of the Board members cast in person at a meeting called for the purpose
of voting on the Plan.  The Plan was last so approved on December 8, 1997.
The Plan is terminable at any time by vote of a majority of the Board
members who are not "interested persons" and have no direct or indirect
financial interest in the operation of the Plan.
    
   
     The fees paid by the Money Market Series and the Government Securities
Series pursuant to the Plan for the fiscal year ended December 31, 1997
amounted to $65,762 and $48,489, respectively.
    


                      REDEMPTION OF SHARES

     The following information supplements and should be read in conjunction
with the section in the Fund's Prospectus entitled "How to Redeem Shares."
   

     Check Redemption Privilege.  The Fund provides Redemption Checks
("Checks") automatically upon opening an account, unless the investor
specifically refuses the Check Redemption Privilege by checking the
applicable "No" box on the Account Application.  Checks will be sent only to
the registered owner(s) of the account and only to the address of record.
The Check Redemption Privilege may be established for an existing account by
a separate signed Shareholder Services Form.  The Account Application or
Shareholder Services Form must be manually signed by the registered
owner(s).  Checks are drawn on the investor's Fund account and may be made
payable to the order of any person in an amount of $500 or more.  When a
Check is presented to the Transfer Agent for payment, the Transfer Agent, as
the investor's agent, will cause the Fund to redeem a sufficient number of
shares in the investor's account to cover the amount of the Check.
Dividends are earned until the Check clears.  After clearance, a copy of the
Check will be returned to the investor.  Shareholders generally will be
subject to the same rules and regulations that apply to checking accounts,
although the election of this Privilege creates only a shareholder-transfer
agent relationship with the Transfer Agent.
    
     If the amount of the Check is greater than the value of the shares in
the investor's account, the Check will be returned marked insufficient
funds.  Checks should not be used to close an account.
   

     Wire Redemption Privilege.  By using this Privilege, the investor
authorizes the Transfer Agent to act on wire, telephone or letter redemption
instructions from any person representing himself or herself to be the
investor and reasonably believed by the Transfer Agent to be genuine.
Ordinarily, the Fund will initiate payment for shares redeemed pursuant to
this Privilege on the same business day if the redemption request is
received by the Transfer Agent in proper form prior to 12:00 Noon, New York
time, on such day; otherwise, the Fund will initiate payment on the next
business day.  Redemption proceeds ($1,000 minimum) will be transferred by
Federal Reserve wire only to the commercial bank account specified by the
investor on the Account Application or Shareholder Services Form, or to a
correspondent bank if the investor's bank is not a member of the Federal
Reserve System.  Fees ordinarily are imposed by such bank and borne by the
investor.  Immediate notification by the correspondent bank to the
investor's bank is necessary to avoid a delay in crediting the funds to the
investor's bank account.
    

     Investors with access to telegraphic equipment may wire redemption
requests to the Transfer Agent by employing the following transmittal code
which may be used for domestic or overseas transmissions:

                              Transfer Agent's
     Transmittal Code         Answer Back Sign

     144295                   144295 TSSG PREP

     Investors who do not have direct access to telegraphic equipment may
have the wire transmitted by contacting a TRT Cables operator at
1-800-654-7171, toll free.  Investors should advise the operator that the
above transmittal code must be used and should also inform the operator of
the Transfer Agent's answer back sign.

     To change the commercial bank or account designated to receive
redemption proceeds, a written request must be sent to the Transfer Agent.
This request must be signed by each shareholder, with each signature
guaranteed as described below under "Share Certificates; Signatures."

     Share Certificates; Signatures.  Any certificate representing Fund
shares to be redeemed must be submitted with the redemption request.
Written redemption requests must be signed by each shareholder, including
each holder of a joint account, and each signature must be guaranteed.
Signatures on endorsed certificates submitted for redemption also must be
guaranteed.  The Transfer Agent has adopted standards and procedures
pursuant to which signature-guarantees in proper form generally will be
accepted from domestic banks, brokers, dealers, credit unions, national
securities exchanges, registered securities associations, clearing agencies
and savings associations, as well as from participants in the New York Stock
Exchange Medallion Program, the Securities Transfer Agents Medallion Program
("STAMP") and the Stock Exchanges Medallion Program.  Guarantees must be
signed by an authorized signatory of the guarantor and "Signature-
Guaranteed" must appear with the signature.  The Transfer Agent may request
additional documentation from corporations, executors, administrators,
trustees or guardians, and may accept other suitable verification
arrangements from foreign investors, such as consular verification.  For
more information with respect to signature-guarantees, please call one of
the telephone numbers listed on the cover.
   

     Redemption Commitment.  The Fund has committed itself to pay in cash
all redemption requests by any shareholder of record, limited in amount
during any 90-day period to the lesser of $250,000 or 1% of the value of the
relevant series' net assets at the beginning of such period.  Such
commitment is irrevocable without the prior approval of the Securities and
Exchange Commission.  In the case of requests for redemption in excess of
such amount, the Fund's Board reserves the right to make payments in whole
or part in securities or other assets of the relevant series in case of an
emergency or any time a cash distribution would impair the liquidity of such
series to the detriment of the existing shareholders.  In such event, the
securities would be valued in the same manner as the series' portfolio is
valued.  If the recipient sold such securities, brokerage charges might be
incurred.
    

     Suspension of Redemptions.  The right of redemption may be suspended or
the date of payment postponed (a) during any periods when the New York Stock
Exchange is closed (other than customary weekend and holiday closings), (b)
when trading in the markets the Fund ordinarily utilizes is restricted, or
when an emergency exists as determined by the Securities and Exchange
Commission so that disposal of the Fund's investments or determination of
its net asset value is not reasonably practicable, or (c) for such other
periods as the Securities and Exchange Commission by order may permit to
protect the Fund's shareholders.


                      SHAREHOLDER SERVICES

     The following information supplements and should be read in conjunction
with the section in the Fund's Prospectus entitled "Shareholder Services."

     Fund Exchanges.  Shares of other funds purchased by exchange will be
purchased on the basis of relative net asset value per share as follows:

          A.   Exchanges for shares of funds that are offered without a
               sales load will be made without a sales load.

          B.   Shares of funds purchased without a sales load may be
               exchanged for shares of other funds sold with a sales load,
               and the applicable sales load will be deducted.

          C.   Shares of funds purchased with a sales load may be exchanged
               without a sales load for shares of other funds sold without a
               sales load.

          D.   Shares of funds purchased with a sales load, shares of funds
               acquired by a previous exchange from shares purchased with a
               sales load, and additional shares acquired through
               reinvestment of dividends or distributions of any such funds
               (collectively referred to herein as "Purchased Shares") may
               be exchanged for shares of other funds sold with a sales load
               (referred to herein as "Offered Shares"), provided that, if
               the sales load applicable to the Offered Shares exceeds the
               maximum sales load that could have been imposed in connection
               with the Purchased Shares (at the time the Purchased Shares
               were acquired), without giving effect to any reduced loads,
               the difference will be deducted.

     To accomplish an exchange under item D above, shareholders must notify
the Transfer Agent of their prior ownership of fund shares and their account
number.

     To request an exchange, an investor must give exchange instructions to
the Transfer Agent in writing or by telephone.  The ability to issue
exchange instructions by telephone is given to all Fund shareholders
automatically, unless the investor checks the applicable "No" box on the
Account Application, indicating that the investor specifically refuses this
privilege. By using the Telephone Exchange Privilege, the investor
authorizes the Transfer Agent to act on telephonic instructions (including
over The Dreyfus Touchr automated telephone system) from any person
representing himself or herself to be the investor, and reasonably believed
by the Transfer Agent to be genuine.  Telephone exchanges may be subject to
limitations as to the amount involved or the number of telephone exchanges
permitted.  Shares issued in certificate form are not eligible for telephone
exchanges.

     Dreyfus Auto-Exchange Privilege.  Dreyfus Auto-Exchange Privilege
permits an investor to purchase, in exchange for shares of the Fund, shares
of certain other funds in the Dreyfus Family of Funds.  This Privilege is
available only for existing accounts.  Shares will be exchanged on the basis
of relative net asset value set forth above under "Fund Exchanges."
Enrollment in or modification or cancellation of this Privilege is effective
three business days following notification by the investor.  An investor
will be notified if his  account falls below the amount designated to be
exchanged under this Privilege.  In this case, an investor's account will
fall to zero unless additional investments are made in excess of the
designated amount prior to the next Auto-Exchange transaction.  Shares held
under IRA and other retirement plans are eligible for this Privilege.
Exchanges of IRA shares may be made between IRA accounts and from regular
accounts to IRA accounts, but not from IRA accounts to regular accounts.
With respect to all other retirement accounts, exchanges may be made only
among those accounts.
   

     Fund Exchanges and the Dreyfus Auto-Exchange Privilege are available to
shareholders resident in any state in which shares of the fund being
acquired may legally be sold.  Shares may be exchanged only between accounts
having identical names and other identifying designations.
    

     Shareholder Services Forms and prospectuses of the other funds may be
obtained by calling 1-800-645-6561.  The Fund reserves the right to reject
any exchange request in whole or in part.  The Fund Exchanges service or
Dreyfus Auto-Exchange Privilege may be modified or terminated at any time
upon notice to shareholders.

     Dreyfus Dividend Sweep.  Dreyfus Dividend Sweep allows investors to
invest automatically their dividends or dividends and capital gain
distributions, if any, from the Fund in shares of another fund in the
Dreyfus Family of Funds of which the investor is a shareholder.  Shares of
other funds purchased pursuant to this privilege will be purchased on the
basis of relative net asset value per share as follows:

          A.   Dividends and distributions paid by a fund may be
               invested without imposition of a sales load in shares of
               other funds that are offered without a sales load.

          B.   Dividends and distributions paid by a fund which
               does not charge a sales load may be invested in shares
               of other funds sold with a sales load, and the
               applicable sales load will be deducted.

          C.   Dividends and distributions paid by a fund which
               charges a sales load may be invested in shares of other
               funds sold with a sales load (referred to herein as
               "Offered Shares"), provided that, if the sales load
               applicable to the Offered Shares exceeds the maximum
               sales load charged by the fund from which dividends or
               distributions are being swept, without giving effect to
               any reduced loads, the difference will be deducted.

          D.   Dividends and distributions paid by a fund may be
               invested in shares of other funds that impose a
               contingent deferred sales charge ("CDSC") and the
               applicable CDSC, if any, will be imposed upon redemption
               of such shares.


                     PORTFOLIO TRANSACTIONS

     Portfolio securities ordinarily are purchased from the issuer or from
an underwriter or a market maker for the securities.  Usually no brokerage
commissions are paid by the Fund for such purchases.  Purchases from
underwriters of portfolio securities include a concession paid by the issuer
to the underwriter and the purchase price paid to market makers for the
securities may include the spread between the bid and asked price.  No
brokerage commissions have been paid by the Fund to date.

     Transactions are allocated to various dealers by the Fund's portfolio
managers in their best judgment.  The primary consideration is prompt and
effective execution of orders at the most favorable price.  Subject to that
primary consideration, dealers may be selected for research, statistical or
other services to enable the Manager to supplement its own research and
analysis with the views and information of other securities firms.

     Research services furnished by brokers through which the Fund effects
securities transactions may be used by the Manager in advising other funds
it advises and, conversely, research services furnished to the Manager by
brokers in connection with other funds the Manager advises may be used by
the Manager in advising the Fund.  Although it is not possible to place a
dollar value on these services, it is the opinion of the Manager that the
receipt and study of such services should not reduce the overall expenses of
its research department.


                DETERMINATION OF NET ASSET VALUE

     The following information supplements and should be read in conjunction
with the section in the Fund's Prospectus entitled "How to Buy Shares."

     Amortized Cost Pricing.  The valuation of the Fund's portfolio
securities is based upon their amortized cost which does not take into
account unrealized gains or losses.  This involves valuing an instrument at
its cost and thereafter assuming a constant amortization to maturity of any
discount or premium, regardless of the impact of fluctuating interest rates
on the market value of the instrument.  While this method provides certainty
in valuation, it may result in periods during which value, as determined by
amortized cost, is higher or lower than the price the Fund would receive if
it sold the instrument.

     The Fund's Board has established, as a particular responsibility within
the overall duty of care owed to the Fund's investors, procedures reasonably
designed to stabilize the Fund's price per share as computed for the purpose
of purchases and redemptions at $1.00.  Such procedures include review of
the Fund's portfolio holdings by the Board, at such intervals as it may deem
appropriate, to determine whether the Fund's net asset value calculated by
using available market quotations or market equivalents deviates from $1.00
per share based on amortized cost.  In such review, investments for which
market quotations are readily available will be valued at the most recent
bid price or yield equivalent for such securities or for securities of
comparable maturity, quality and type, as obtained from one or more of the
major market makers for the securities to be valued.  Other investments and
assets will be valued at fair value as determined in good faith by the
Board.

     The extent of any deviation between the Fund's net asset value based
upon available market quotations or market equivalents and $1.00 per share
based on amortized cost will be examined by the Fund's Board.  If such
deviation exceeds 1/2 of 1%, the Board will consider promptly what action,
if any, will be initiated.  In the event the Board determines that a
deviation exists which may result in material dilution or other unfair
results to investors or existing shareholders, it has agreed to take such
corrective action as it regards as necessary and appropriate, including:
selling portfolio instruments prior to maturity to realize capital gains or
losses or to shorten average portfolio maturity; withholding dividends or
paying distributions from capital or capital gains; redeeming shares in
kind; or establishing a net asset value per share by using available market
quotations.
   

      New York Stock Exchange and Transfer Agent Closings.  The holidays (as
observed) on which the New York Stock Exchange and the Transfer Agent are
closed currently are:  New Year's Day, Martin Luther King Jr. Day,
Presidents' Day, Memorial Day, Independence Day, Labor Day, Thanksgiving and
Christmas.  In addition, the New York Stock Exchange is closed on Good
Friday.
    


               DIVIDENDS, DISTRIBUTIONS AND TAXES

     The following information supplements and should be read in conjunction
with the section in Fund's Prospectus entitled "Dividends, Distributions and
Taxes."

     Ordinarily, gains and losses realized from portfolio transactions will
be treated as capital gain or loss.  However, all or a portion of any gains
realized from the sale or other disposition of certain market discount bonds
will be treated as ordinary income under Section 1276 of the Internal
Revenue Code of 1986, as amended.


                       YIELD INFORMATION

     The following information supplements and should be read in conjunction
with the section in the Fund's Prospectus entitled "Yield Information."
   

     For the seven-day period ended December 31, 1997, the Money Market
Series' yield was 5.21% and its effective yield was 5.35%.  For the
seven-day period ended December 31, 1997, the Government Securities Series'
yield was 4.88% and its effective yield was 5.00%.  Yield is computed in
accordance with a standardized method which involves determining the net
change in the value of a hypothetical pre-existing Fund account having a
balance of one share at the beginning of a seven calendar day period for
which yield is to be quoted, dividing the net change by the value of the
account at the beginning of the period to obtain the base period return, and
annualizing the results (i.e., multiplying the base period return by 365/7).
The net change in the value of the account reflects the value of additional
shares purchased with dividends declared on the original share and any such
additional shares and fees that may be charged to shareholder accounts, in
proportion to the length of the base period and the Fund's average account
size, but does not include realized gains and losses or unrealized
appreciation and depreciation.  Effective yield is computed by adding 1 to
the base period return (calculated as described above), raising that sum to
a power equal to 365 divided by 7, and subtracting 1 from the result.
    

     Yields will fluctuate and are not necessarily representative of future
results.  Investors should remember that yield is a function of the type and
quality of the instruments in the portfolio, portfolio maturity and
operating expenses.  An investor's principal in the Fund is not guaranteed.
See "Determination of Net Asset Value" for a discussion of the manner in
which the Fund's price per share is determined.

     From time to time, the Fund in its advertising and sales literature may
refer to the growth of assets managed or administered by the Manager over
certain time periods.


                   INFORMATION ABOUT THE FUND

     The following information supplements and should be read in conjunction
with the section in the Fund's Prospectus entitled "General Information."

     Each share has one vote and, when issued and paid for in accordance
with the terms of the offering, is fully paid and non-assessable.  Shares
have no preemptive, subscription, or conversion rights and are freely
transferable.
   

     Under Massachusetts law, shareholders could, under certain
circumstances, be held personally liable for the obligations of the Fund.
However, the Agreement and Declaration of Trust (the "Trust Agreement")
disclaims shareholder liability for acts or obligations of the Fund and
requires that notice of such disclaimer be given in each agreement,
obligation or instrument entered into or executed by the Fund or a Board
member.  The Trust Agreement provides for indemnification from the Fund's
property for all losses and expenses of any shareholder held personally
liable for the obligations of the Fund.  Thus, the risk of a shareholder's
incurring financial loss on account of shareholder liability is limited to
circumstances in which the Fund itself would be unable to meet its
obligations, a possibility which management believes is remote.  Upon
payment of any liability incurred by the Fund, the shareholder paying such
liability will be entitled to reimbursement from the general assets of the
Fund.  The Fund intends to conduct its operations in such a way so as to
avoid, as far as possible, ultimate liability of the shareholders for
liabilities of the Fund.
    

     Rule 18f-2 under the 1940 Act provides that any matter required to be
submitted under the provisions of the 1940 Act or applicable state law or
otherwise, to the holders of the outstanding voting securities of an
investment company, such as the Fund, will not be deemed to have been
effectively acted upon unless approved by the holders of a majority of the
outstanding shares of each series affected by such matter.  Rule 18f-2
further provides that a series shall be deemed to be affected by a matter
unless it is clear that the interests of each series in the matter are
identical or that the matter does not affect any interest of such series.
However, the Rule exempts the selection of independent accountants and the
election of Board members from the separate voting requirements of the Rule.

     The Fund sends annual and semi-annual financial statements to all its
shareholders.


       TRANSFER AND DIVIDEND DISBURSING AGENT, CUSTODIAN,
                COUNSEL AND INDEPENDENT AUDITORS
   

     Dreyfus Transfer, Inc., a wholly-owned subsidiary of the Manager, P.O.
Box 9671, Providence, Rhode Island 02940-9671, is the Fund's transfer and
dividend disbursing agent.  Under a transfer agency agreement with the Fund,
the Transfer Agent arranges for the maintenance of shareholder account
records for the Fund, the handling of certain communications between
shareholders and the Fund and the payment of dividends and distributions
payable by the Fund.  For these services, the Transfer Agent receives a
monthly fee computed on the basis of the number of shareholder accounts it
maintains for the Fund during the month, and is reimbursed for certain out-
of-pocket expenses.  For the fiscal year ended December 31, 1997, the Fund
paid the Transfer Agent $67,718 with respect to the Money Market Series and
$4,255 with respect to the Government Securities Series.
    
   
     The Bank of New York, 90 Washington Street, New York, New York 10286,
acts as custodian.  The Bank of New York has no part in determining the
investment policies of either Series or which securities are to be purchased
or sold by the Series.
    

     Stroock & Stroock & Lavan LLP, 180 Maiden Lane, New York, New York
10038-4982, as counsel for the Fund, has rendered its opinion as to certain
legal matters regarding the due authorization and valid issuance of the
shares being sold pursuant to the Fund's Prospectus.

     Ernst & Young LLP, 787 Seventh Avenue, New York, New York 10019,
independent auditors, have been selected as auditors of the Fund.


           FINANCIAL STATEMENTS AND REPORT OF INDEPENDENT AUDITORS

   

     The Annual Report to Shareholders for the fiscal year ended December
31, 1997 is a separate document supplied with this Statement of Additional
Information, and the financial statements, accompanying notes and report of
independent auditors appearing therein are incorporated by reference into
this Statement of Additional Information.
    

                            APPENDIX
   

     Description of the two highest commercial paper, bond and other short-
and long-term rating categories assigned by Standard & Poor's Ratings Group
("S&P"),  Moody's Investors Service, Inc. ("Moody's"), Fitch IBCA, Inc.
("Fitch"), Duff & Phelps Credit Rating Co. ("Duff") and Thomson BankWatch,
Inc. ("BankWatch"):
    

Commercial Paper and Short-Term Ratings

     The designation A-1 by S&P indicates that the degree of safety
regarding timely payment is either overwhelming or very strong.  Capacity
for timely payment on issues with an A-2 designation is strong.  However,
the relative degree of safety is not as high as for issues designated A-1.
Those issues determined to possess overwhelming safety characteristics are
denoted with a plus sign (+) designation.

     The rating Prime-1 (P-1) is the highest commercial paper rating
assigned by Moody's.  Issuers of P-1 paper must have a superior capacity for
repayment of short-term promissory obligations, and ordinarily will be
evidenced by leading market positions in well established industries, high
rates of return on funds employed, conservative capitalization structures
with moderate reliance on debt and ample asset protection, broad margins in
earnings coverage of fixed financial charges and high internal cash
generation, and well established access to a range of financial markets and
assured sources of alternate liquidity. Issues rated Prime-2 (P-2) have a
strong capacity for repayment of short-term promissory obligations.  This
ordinarily will be evidenced by many of the characteristics cited above but
to a lesser degree.  Earnings trends and coverage ratios, while sound, will
be more subject to variation.  Capitalization characteristics, while still
appropriate, may be more affected by external conditions.  Ample alternate
liquidity is maintained.

     The rating Fitch-1 (Highest Grade) is the highest commercial paper
rating assigned by Fitch.  Paper rated Fitch-1 is regarded as having the
strongest degree of assurance for timely payment.  The rating Fitch-2 (Very
Good Grade) is the second highest commercial paper rating assigned by Fitch
which reflects an assurance of timely payment only slightly less in degree
than the strongest issues.

     The rating Duff-1 is the highest commercial paper rating assigned by
Duff.  Paper rated Duff-1 is regarded as having very high certainty of
timely payment with excellent liquidity factors which are supported by ample
asset protection.  Risk factors are minor.  Paper rated Duff-2 is regarded
as having good certainty of timely payment, good access to capital markets
and sound liquidity factors and company fundamentals.  Risk factors are
small.
   
    

     The rating TBW-1 is the highest short-term obligation rating assigned
by BankWatch.  Obligations rated TBW-1 are regarded as having the strongest
capacity for timely repayment.  Obligations rated TBW-2 are supported by a
strong capacity for timely repayment, although the degree of safety is not
as high as for issues rated TBW-1.

Bond and Long-Term Ratings

     Bonds rated AAA are considered by S&P to be the highest grade
obligations and possess an extremely strong capacity to pay principal and
interest.  Bonds rated AA by S&P are judged by S&P to have a very strong
capacity to pay principal and interest, and in the majority of instances,
differ only in small degree from issues rated AAA.  The rating AA may be
modified by the addition of a plus or minus sign to show relative standing
within the rating category.

     Bonds rated Aaa are judged by Moody's to be of the best quality.  Bonds
rated Aa by Moody's are judged by Moody's to be of high quality by all
standards.   Together with the Aaa group, they comprise what are generally
known as high-grade bonds.  Bonds rated Aa are rated lower than Aaa bonds
because margins of protection may not be as large or fluctuations of
protective elements may be of greater amplitude or there may be other
elements present which make the long-term risks appear somewhat larger.
Moody's applies the numerical modifiers 1, 2 and 3 in the Aa rating
category.  The modifier 1 indicates a ranking for the security in the higher
end of this rating category, the modifier 2 indicates a mid-range ranking
and the modifier 3 indicates a ranking in the lower end of the rating
category.

     Bonds rated AAA by Fitch are judged by Fitch to be strictly high-grade,
broadly marketable and suitable for investment by trustees and fiduciary
institutions and liable to but slight market fluctuation other than through
changes in the money rate.  The prime feature of an AAA bond is a showing of
earnings several times or many times interest requirements, with such
stability of applicable earnings that safety is beyond reasonable question
whatever changes occur in conditions.  Bonds rated AA by Fitch are judged by
Fitch to be of safety virtually beyond question and are readily salable,
whose merits are not unlike those of the AAA class, but whose margin of
safety is less strikingly broad.  The issue may be the obligation of a small
company, strongly secured but influenced as to rating by the lesser
financial power of the enterprise and more local type of market.

     Bonds rated AAA by Duff are considered to be of the highest credit
quality.  The risk factors are negligible, being only slightly more than
U.S. Treasury debt.  Bonds rated AA are considered to be of high credit
quality with strong protection factors.  Risk is modest but may vary
slightly from time to time because of economic conditions.

   
    
   

     Fitch also assigns a rating to certain international and U.S. banks.  A
Fitch bank rating represents Fitch's current assessment of the strength of
the bank and whether such bank would receive support should it experience
difficulties.   In its assessment of a bank, Fitch uses a dual rating system
comprised of Legal Ratings and Individual Ratings.  In addition, Fitch
assigns banks long- and short-term ratings as used in the corporate ratings
discussed above.  Legal Ratings, which range in gradations from 1 through 5,
address the question of whether the bank would receive support provided by
central banks or shareholders if it experienced difficulties, and such
ratings are considered by Fitch to be a prime factor in its assessment of
credit risk.  Individual Ratings, which range in gradations from A through
E, represent Fitch's assessment of a bank's economic merits and address the
question of how the bank would be viewed if it were entirely independent and
could not rely on support from state authorities or its owners.
    

     In addition to ratings of short-term obligations, BankWatch assigns a
rating to each issuer it rates, in gradations of A through E.  BankWatch
examines all segments of the organization including, were applicable, the
holding company, member banks or associations, and other subsidiaries.  In
those instances where financial disclosure is incomplete or untimely, a
qualified rating (QR) is assigned to the institution.  BankWatch also
assigns, in the case of foreign banks, a country rating which represents a
assessment of the overall  political and economic stability of the country
in which the bank is domiciled.


                   DREYFUS INSTITUTIONAL MONEY MARKET FUND
                          PART C. OTHER INFORMATION
                          _________________________


Item 24.  Financial Statements and Exhibits. - List
_______   _________________________________________

     (a)  Financial Statements:

               Included in Part A of the Registration Statement
   

               Condensed Financial Information for each of the ten years in
               the period ended December 31, 1997
    

               Included in Part B of the Registration Statement:

   

                    Statement of Investments-- December 31, 1997*
    
   
                    Statement of Assets and Liabilities-- December 31, 1997*
    
   
                    Statement of Operations--year ended December 31, 1997*
    
   
                    Statement of Changes in Net Assets--for each of the two
                    years in the period ended December 31, 1997*
    
   
                    Financial Highlights--for the five years ended December
                    31, 1997*
    
   
                    Notes to Financial Statements*
    
   
                    Report of Ernst & Young LLP, Independent Auditors, dated
                    February 5, 1998.*
    
   
* Incorporated by reference to Registrant's Annual Report to Shareholders
  on form N-30-D filed with the Securities and Exchange Commission on March
  2, 1998.
    
   
All Schedules and other financial statement information, for which provision
is made in the applicable accounting regulations of the Securities and
Exchange Commission, are either omitted because they are not required under
the related instructions, they are inapplicable, or the required information
is presented in the financial statements or notes thereto which are
incorporated by reference to Part B of the Registration Statement.
    


Item 24.  Financial Statements and Exhibits. - List (continued)
_______   _____________________________________________________

(b)      Exhibits:

(1)       Registrant's Agreement and Declaration of Trust, as amended, is
          incorporated by reference to Exhibit (1) of Post-Effective
          Amendment No. 27 to the Registration Statement on Form N-1A, filed
          on April 29, 1996.

(2)       Registrant's By-Laws are incorporated by reference to Exhibit (2)
          of Post-Effective Amendment No. 27 to the Registration Statement
          on Form N-1A, filed on April 29, 1996.

(5)       Management Agreement is incorporated by reference to Exhibit (5)
          of Post-Effective Amendment No. 25 to the Registration Statement
          on Form N-1A, filed on March 2, 1995.

(6)       Distribution Agreement is incorporated by reference to Exhibit (6)
          of Post-Effective Amendment No. 25 to the Registration Statement
          on Form N-1A, filed on March 2, 1995.

(8)(a)    Amended and Restated Custody Agreement is incorporated by
          reference to Exhibit 8(a) of Post-Effective Amendment No. 27 to
          the Registration Statement on Form N-1A, filed on April 29, 1996.

(8)(b)    Sub-Custodian Agreement is incorporated by reference to Exhibit
          8(b) of Post-Effective Amendment No. 27 to the Registration
          Statement on Form N-1A, filed on April 29, 1996.

(10)      Opinion and consent of Registrant's counsel is incorporated by
          reference to Exhibit (10) of Post-Effective Amendment No. 27 to
          the Registration Statement on Form N-1A, filed on April 29, 1996.

(11)      Consent of Independent Auditors.
   

(14)      Model Retirement Plans are incorporated by reference to Exhibit
          (14) of Post-Effective Amendment No. 29 to the Registration
          Statement on Form  N-1A, filed on April 28, 1997.
    

(16)      Schedules of Computation of Performance Data are incorporated by
          reference to Exhibit (16) of Post-Effective Amendment No. 23 to
          the Registration Statement on Form N-1A, filed on March 29, 1994.

(17)      Financial Data Schedule.


Item 24.  Financial Statements and Exhibits. - List (continued)
_______   _____________________________________________________

          Other Exhibits
          ______________

                (a)  Powers of Attorney of the Directors and officers.

                (b)  Certificate of Secretary.

Item 25.  Persons Controlled by or under Common Control with Registrant.
_______   ______________________________________________________________

          Not Applicable

Item 26.  Number of Holders of Securities.
_______   ________________________________
   

            (1)                                   (2)

                                              Number of Record
        Title of Class                      Holders as of April 13, 1998
        ______________                      _____________________________
    
   
        Money Market Series
        Beneficial Interest
        (Par value $.001)                         3,980
    
   
        Government Securities Series
        Beneficial Interest
        (Par value $.001)                           207
    

Item 27.    Indemnification
_______ _______________

           Reference is made to Article EIGHTH of the Registrant's
        Agreement and Declaration of Trust incorporated by reference to
        Exhibit (1) of Post-Effective Amendment No. 27 to the Registration
        Statement on Form N-1A, filed on April 29, 1996.  The application
        of these provisions is limited by Article 10 of the Registrant's By-
        Laws incorporated by reference to Exhibit (2) of Post-Effective
        Amendment No. 27 to the Registration Statement on Form N-1A, filed
        on April 29, 1996, and by the following undertaking set forth in
        the rules promulgated by the Securities and Exchange Commission:

Item 27.    Indemnification (continued)
_______ _______________

                 Insofar as indemnification for liabilities arising under
            the Securities Act of 1933 may be permitted to trustees,
            officers and controlling persons of the registrant pursuant to
            the foregoing provisions, or otherwise, the registrant has been
            advised that in the opinion of the Securities and Exchange
            Commission such indemnification is against public policy as
            expressed in such Act and is, therefore, unenforceable.  In the
            event that a claim for indemnification against such liabilities
            (other than the payment by the registrant of expenses incurred
            or paid by a trustee, officer or controlling person of the
            registrant in the successful defense of any action, suit or
            proceeding) is asserted by such trustee, officer or controlling
            person in connection with the securities being registered, the
            registrant will, unless in the opinion of its counsel the
            matter has been settled by controlling precedent, submit to a
            court of appropriate jurisdiction the question whether such
            indemnification by it is against public policy as expressed in
            such Act and will be governed by the final policy as expressed
            in such Act and will be governed by the final adjudication of
            such issue.  Reference is also made to the Distribution
            Agreement incorporated by reference to Exhibit (6) of Post-
            Effective Amendment No. 25 to the Registration Statement on
            Form N-1A, filed on March 2, 1995.


Item 28.       Business and Other Connections of Investment Adviser.
_______    ____________________________________________________

              The Dreyfus Corporation ("Dreyfus") and subsidiary companies
           comprise a financial service organization whose business
           consists primarily of providing investment management services
           as the investment adviser, manager for sponsored investment
           companies registered under the Investment Company Act of 1940
           and as an investment adviser to institutional and individual
           accounts.  Dreyfus also serves as sub-investment adviser to
           and/or administrator of other investment companies. Dreyfus
           Service Corporation, a wholly-owned subsidiary of Dreyfus,
           serves primarily as a registered broker-dealer of shares of
           investment companies sponsored by Dreyfus and of other
           investment companies  for which Dreyfus acts as investment
           adviser, sub-investment adviser or administrator.  Dreyfus
           Management, Inc., another wholly-owned subsidiary, provides
           investment management services to various pension plans,
           institutions and individuals.

Item 28.  Business and Other Connections of Investment Adviser (continued)
________  ________________________________________________________________

          Officers and Directors of Investment Adviser
          ____________________________________________

Name and Position
with Dreyfus                 Other Businesses
_________________            ________________

MANDELL L. BERMAN            Real estate consultant and private investor
Director                          29100 Northwestern Highway, Suite 370
                                  Southfield, Michigan 48034;
                             Past Chairman of the Board of Trustees:
                                  Skillman Foundation;
                             Member of The Board of Vintners Intl.

BURTON C. BORGELT            Chairman Emeritus of the Board and
Director                     Past Chairman, Chief Executive Officer and
                             Director:
                                  Dentsply International, Inc.
                                  570 West College Avenue
                                  York, Pennsylvania 17405;
                             Director:
                                  DeVlieg-Bullard, Inc.
                                  1 Gorham Island
                                  Westport, Connecticut 06880
                                  Mellon Bank Corporation***;
                                  Mellon Bank, N.A.***

FRANK V. CAHOUET             Chairman of the Board, President and
Director                     Chief Executive Officer:
                                  Mellon Bank Corporation***;
                                  Mellon Bank, N.A.***;
                             Director:
                                  Avery Dennison Corporation
                                  150 North Orange Grove Boulevard
                                  Pasadena, California 91103;
                                  Saint-Gobain Corporation
                                  750 East Swedesford Road
                                  Valley Forge, Pennsylvania 19482;
                                  Teledyne, Inc.
                                  1901 Avenue of the Stars
                                  Los Angeles, California 90067

W. KEITH SMITH               Chairman and Chief Executive Officer:
Chairman of the Board             The Boston Company****;
                             Vice Chairman of the Board:
                                  Mellon Bank Corporation***;
                                  Mellon Bank, N.A.***;
                             Director:
                                  Dentsply International, Inc.
                                  570 West College Avenue
                                  York, Pennsylvania 17405

CHRISTOPHER M. CONDRON       Vice Chairman:
President, Chief                  Mellon Bank Corporation***;
Executive Officer,                The Boston Company****;
Chief Operating              Deputy Director:
Officer and a                     Mellon Trust***;
Director                     Chief Executive Officer:
                                  The Boston Company Asset Management,
                                  Inc.****;
                             President:
                                  Boston Safe Deposit and Trust Company****

STEPHEN E. CANTER            Director:
Vice Chairman and                 The Dreyfus Trust Company++;
Chief Investment Officer,    Formerly, Chairman and Chief Executive Officer:
and a Director                    Kleinwort Benson Investment Management
                                       Americas Inc.*

LAWRENCE S. KASH             Chairman, President and Chief
Vice Chairman-Distribution   Executive Officer:
and a Director                    The Boston Company Advisors, Inc.
                                  53 State Street
                                  Exchange Place
                                  Boston, Massachusetts 02109;
                             Executive Vice President and Director:
                                  Dreyfus Service Organization, Inc.**;
                             Director:
                                  Dreyfus America Fund+++;
                                  The Dreyfus Consumer Credit Corporation*;
                                  The Dreyfus Trust Company++;
                                  Dreyfus Service Corporation*;
                             President:
                                  The Boston Company****;
                                  Laurel Capital Advisors***;
                                  Boston Group Holdings, Inc.;
                             Executive Vice President:
                                  Mellon Bank, N.A.***;
                                  Boston Safe Deposit and Trust
                                  Company****

RICHARD F. SYRON             Chairman of the Board and
Director                     Chief Executive Officer:
                                  American Stock Exchange
                                  86 Trinity Place
                                  New York, New York 10006;
                             Director:
                                  John Hancock Mutual Life Insurance Company
                                  John Hancock Place, Box 111
                                  Boston, Massachusetts 02117;
                                  Thermo Electron Corporation
                                  81 Wyman Street, Box 9046
                                  Waltham, Massachusetts 02254-9046;
                                  American Business Conference
                                  1730 K Street, NW, Suite 120
                                  Washington, D.C. 20006;
                             Trustee:
                                  Boston College - Board of Trustees
                                  140 Commonwealth Ave.
                                  Chestnut Hill, Massachusetts 02167-3934

J. DAVID OFFICER             Vice Chairman:
Vice Chairman                     The Dreyfus Corporation*;
                             Director:
                                  Dreyfus Financial Services Corporation*****;
                                  Dreyfus Investment Services Corporation*****;
                                  Mellon Trust of Florida
                                  2875 Northeast 191st Street
                                  North Miami Beach, Florida 33180;
                                  Mellon Preferred Capital Corporation****;
                                  Boston Group Holdings, Inc.****;
                                  Mellon Trust of New York
                                  1301 Avenue of the Americas - 41st Floor
                                  New York, New York 10019;
                                  Mellon Trust of California
                                  400 South Hope Street
                                  Los Angeles, California 90071-2806;
                             Executive Vice President:
                                  Mellon Bank, N.A.***;
                             Vice Chairman and Director:
                                  The Boston Company, Inc.****;
                             President and Director:
                                  RECO, Inc.****;
                                  The Boston Company Financial Services,
                                  Inc.****;
                                  Boston Safe Deposit and Trust Company****;

RONALD P. O'HANLEY           Vice Chairman:
Vice Chairman                     The Dreyfus Corporation*;
                             Director:
                                  The Boston Company Asset Management, LLC****;
                                  TBCAM Holding, Inc.****;
                                  Franklin Portfolio Holdings, Inc.
                                  Two International Place - 22nd Floor
                                  Boston, Massachusetts 02110;
                                  Mellon Capital Management Corporation
                                  595 Market Street, Suite #3000
                                  San Francisco, California 94105;
                                  Certus Asset Advisors Corporation
                                  One Bush Street, Suite 450
                                  San Francisco, California 94104;
                                  Mellon-France Corporation***;
                             Chairman and Director:
                                  Boston Safe Advisors, Inc.****;
                             Partner Representative:
                                  Pareto Partners
                                  271 Regent Street
                                  London, England W1R 8PP;
                             Chairman and Trustee:
                                  Mellon Bond Associates, LLP***;
                                  Mellon Equity Associates, LLP***;
                             Trustee:
                                  Laurel Capital Advisors, LLP***;
                             Chairman, President and Chief Executive Officer:
                                  Mellon Global Investing Corp.***;
                             Partner:
                                  McKinsey & Company, Inc.
                                  Boston, Massachusetts

WILLIAM T. SANDALLS, JR.     Director:
Senior Vice President and         Dreyfus Partnership Management, Inc.*;
Chief Financial Officer           Seven Six Seven Agency, Inc.*;
                             Chairman and Director:
                                  Dreyfus Transfer, Inc.
                                  One American Express Plaza
                                  Providence, Rhode Island 02903;
                             President and Director:
                                  Lion Management, Inc.*;
                             Executive Vice President and Director:
                                  Dreyfus Service Organization, Inc.*;
                             Vice President, Chief Financial Officer and
                             Director:
                                  Dreyfus America Fund+++;
                             Vice President and Director:
                                  The Dreyfus Consumer Credit Corporation*;
                                  The Truepenny Corporation*;
                             Treasurer, Financial Officer and Director:
                                  The Dreyfus Trust Company++;
                             Treasurer and Director:
                                  Dreyfus Management, Inc.*;
                                  Dreyfus Service Corporation*;
                             Formerly, President and Director:
                                  Sandalls & Co., Inc.

MARK N. JACOBS               Vice President, Secretary and Director:
Vice President,                   Lion Management, Inc.*;
General Counsel              Secretary:
and Secretary                     The Dreyfus Consumer Credit Corporation*;
                                  Dreyfus Management, Inc.*;
                             Assistant Secretary:
                                  Dreyfus Service Organization, Inc.**;
                                  Major Trading Corporation*;
                                  The Truepenny Corporation*

PATRICE M. KOZLOWSKI         None
Vice President-
Corporate Communications

MARY BETH LEIBIG             None
Vice President-
Human Resources

JEFFREY N. NACHMAN           President and Director:
Vice President-Mutual             Dreyfus Transfer, Inc.
Fund Accounting                   One American Express Plaza
                                  Providence, Rhode Island 02903

ANDREW S. WASSER             Vice President:
Vice President-Information        Mellon Bank Corporation***
Services

WILLIAM V. HEALEY            President:
Assistant Secretary               The Truepenny Corporation*;
                             Vice President and Director:
                                  The Dreyfus Consumer Credit Corporation*;
                             Secretary and Director:
                                  Dreyfus Partnership Management Inc.*;
                             Director:
                                  The Dreyfus Trust Company++;
                             Assistant Secretary:
                                  Dreyfus Service Corporation*;
                                  Dreyfus Investment Advisors, Inc.*;
                             Assistant Clerk:
                                  Dreyfus Insurance Agency of Massachusetts,
                                  Inc.+++++

______________________________________

*      The address of the business so indicated is 200 Park Avenue, New York,
       New York 10166.
**     The address of the business so indicated is 131 Second Street,
       Lewes, Delaware 19958.
***    The address of the business so indicated is One Mellon Bank Center,
       Pittsburgh, Pennsylvania 15258.
****   The address of the business so indicated is One Boston Place,
       Boston, Massachusetts 02108.
*****  The address of the business so indicated is Union Trust Building,
       501 Grant Street, Room 179, Pittsburgh, Pennsylvania 15259;
+      The address of the business so indicated is Atrium Building,
       80 Route 4 East, Paramus, New Jersey 07652.
++     The address of the business so indicated is 144 Glenn Curtiss Boulevard,
       Uniondale, New York 11556-0144.
+++    The address of the business so indicated is 69, Route `d'Esch, L-
       1470 Luxembourg.
++++   The address of the business so indicated is 69, Route `d'Esch, L-
       2953 Luxembourg.
+++++  The address of the business so indicated is 53 State Street, Boston,
       Massachusetts 02103.


Item 29.  Principal Underwriters
________  ______________________

     (a)  Other investment companies for which Registrant's principal
underwriter (exclusive distributor) acts as principal underwriter or
exclusive distributor:

1)        Comstock Partners Funds, Inc.
2)        Dreyfus A Bonds Plus, Inc.
3)        Dreyfus Appreciation Fund, Inc.
4)        Dreyfus Asset Allocation Fund, Inc.
5)        Dreyfus Balanced Fund, Inc.
6)        Dreyfus BASIC GNMA Fund
7)        Dreyfus BASIC Money Market Fund, Inc.
8)        Dreyfus BASIC Municipal Fund, Inc.
9)        Dreyfus BASIC U.S. Government Money Market Fund
10)       Dreyfus California Intermediate Municipal Bond Fund
11)       Dreyfus California Tax Exempt Bond Fund, Inc.
12)       Dreyfus California Tax Exempt Money Market Fund
13)       Dreyfus Cash Management
14)       Dreyfus Cash Management Plus, Inc.
15)       Dreyfus Connecticut Intermediate Municipal Bond Fund
16)       Dreyfus Connecticut Municipal Money Market Fund, Inc.
17)       Dreyfus Florida Intermediate Municipal Bond Fund
18)       Dreyfus Florida Municipal Money Market Fund
19)       The Dreyfus Fund Incorporated
20)       Dreyfus Global Bond Fund, Inc.
21)       Dreyfus Global Growth Fund
22)       Dreyfus GNMA Fund, Inc.
23)       Dreyfus Government Cash Management Funds
24)       Dreyfus Growth and Income Fund, Inc.
25)       Dreyfus Growth and Value Funds, Inc.
26)       Dreyfus Growth Opportunity Fund, Inc.
27)       Dreyfus Income Funds
28)       Dreyfus Index Funds, Inc.
29)       Dreyfus Institutional Money Market Fund
30)       Dreyfus Institutional Preferred Money Market Fund
31)       Dreyfus Institutional Short Term Treasury Fund
32)       Dreyfus Insured Municipal Bond Fund, Inc.
33)       Dreyfus Intermediate Municipal Bond Fund, Inc.
34)       Dreyfus International Funds, Inc.
35)       Dreyfus Investment Grade Bond Funds, Inc.
36)       The Dreyfus/Laurel Funds, Inc.
37)       The Dreyfus/Laurel Funds Trust
38)       The Dreyfus/Laurel Tax-Free Municipal Funds
39)       Dreyfus LifeTime Portfolios, Inc.
40)       Dreyfus Liquid Assets, Inc.
41)       Dreyfus Massachusetts Intermediate Municipal Bond Fund
42)       Dreyfus Massachusetts Municipal Money Market Fund
43)       Dreyfus Massachusetts Tax Exempt Bond Fund
44)       Dreyfus MidCap Index Fund
45)       Dreyfus Money Market Instruments, Inc.
46)       Dreyfus Municipal Bond Fund, Inc.
47)       Dreyfus Municipal Cash Management Plus
48)       Dreyfus Municipal Money Market Fund, Inc.
49)       Dreyfus New Jersey Intermediate Municipal Bond Fund
50)       Dreyfus New Jersey Municipal Bond Fund, Inc.
51)       Dreyfus New Jersey Municipal Money Market Fund, Inc.
52)       Dreyfus New Leaders Fund, Inc.
53)       Dreyfus New York Insured Tax Exempt Bond Fund
54)       Dreyfus New York Municipal Cash Management
55)       Dreyfus New York Tax Exempt Bond Fund, Inc.
56)       Dreyfus New York Tax Exempt Intermediate Bond Fund
57)       Dreyfus New York Tax Exempt Money Market Fund
58)       Dreyfus 100% U.S. Treasury Intermediate Term Fund
59)       Dreyfus 100% U.S. Treasury Long Term Fund
60)       Dreyfus 100% U.S. Treasury Money Market Fund
61)       Dreyfus 100% U.S. Treasury Short Term Fund
62)       Dreyfus Pennsylvania Intermediate Municipal Bond Fund
63)       Dreyfus Pennsylvania Municipal Money Market Fund
64)       Dreyfus Premier California Municipal Bond Fund
65)       Dreyfus Premier Equity Funds, Inc.
66)       Dreyfus Premier International Funds, Inc.
67)       Dreyfus Premier GNMA Fund
68)       Dreyfus Premier Worldwide Growth Fund, Inc.
69)       Dreyfus Premier Insured Municipal Bond Fund
70)       Dreyfus Premier Municipal Bond Fund
71)       Dreyfus Premier New York Municipal Bond Fund
72)       Dreyfus Premier State Municipal Bond Fund
73)       Dreyfus Premier Value Fund
74)       Dreyfus Short-Intermediate Government Fund
75)       Dreyfus Short-Intermediate Municipal Bond Fund
76)       The Dreyfus Socially Responsible Growth Fund, Inc.
77)       Dreyfus Stock Index Fund, Inc.
78)       Dreyfus Tax Exempt Cash Management
79)       The Dreyfus Third Century Fund, Inc.
80)       Dreyfus Treasury Cash Management
81)       Dreyfus Treasury Prime Cash Management
82)       Dreyfus Variable Investment Fund
83)       Dreyfus Worldwide Dollar Money Market Fund, Inc.
84)       General California Municipal Bond Fund, Inc.
85)       General California Municipal Money Market Fund
86)       General Government Securities Money Market Fund, Inc.
87)       General Money Market Fund, Inc.
88)       General Municipal Bond Fund, Inc.
89)       General Municipal Money Market Fund, Inc.
90)       General New York Municipal Bond Fund, Inc.
91)       General New York Municipal Money Market Fund

(b)
                                                           Positions and
Name and principal  Positions and offices with              offices with
business address         the Distributor                     Registrant
__________________  ___________________________             _____________

Marie E. Connolly+  Director, President, Chief              President and
                    Executive Officer and Compliance        Treasurer
                    Officer

Joseph F. Tower,    Director, Senior Vice President,        Vice President
           III+     Treasurer and Chief Financial Officer   and Assistant
                                                            Treasurer

Richard W. Ingram   Executive Vice President                Vice President
                                                            and Assistant
                                                            Treasurer

Mary A. Nelson+     Vice President                          Vice President
                                                            and Assistant
                                                            Treasurer

Paul Prescott+      Vice President                          None

Jean M. O'Leary+    Assistant Secretary and                 None
                    Assistant Clerk

John W. Gomez+      Director                                None

William J. Nutt+    Director                                None




________________________________
 +  Principal business address is 60 State Street, Boston, Massachusetts
    02109.
++  Principal business address is 200 Park Avenue, New York, New York
    10166.

Item 30.   Location of Accounts and Records
           ________________________________

                 1.  First Data Investor Services Group, Inc.,
                     a subsidiary of First Data Corporation
                     P.O. Box 9671
                     Providence, Rhode Island 02940-9671

                 2.  The Bank of New York
                     90 Washington Street
                     New York, New York 10286

                 3.  Dreyfus Transfer, Inc.
                     P.O. Box 9671
                     Providence, Rhode Island 02940-9671

                 4.  The Dreyfus Corporation
                     200 Park Avenue
                     New York, New York 10166

Item 31.   Management Services
_______    ___________________

           Not Applicable

Item 32.   Undertakings
________   ____________

  (1)      To call a meeting of shareholders for the purpose of voting upon
           the question of removal of a Board member or Board members when
           requested in writing to do so by the holders of at least 10% of
           the Registrant's outstanding shares and in connection with such
           meeting to comply with the provisions of Section 16(c) of the
           Investment Company Act of 1940 relating to shareholder
           communications.

  (2)      To furnish each person to whom a prospectus is delivered with a
           copy of the Fund's latest Annual Report to Shareholders, upon
           request and without charge.

                                 SIGNATURES

     Pursuant to the requirements of the Securities Act of 1933 and the
Investment Company Act of 1940, the Registrant certifies that it meets all
of the requirements for effectiveness of this amendment to the Registration
Statement pursuant to Rule 485(b) under the Securities Act of 1933 and has
duly caused this Amendment to the Registration Statement to be signed on its
behalf by the undersigned, thereunto duly authorized, in the City of New
York, and State of New York on the 23rd day of April, 1998.

                    DREYFUS INSTITUTIONAL MONEY MARKET FUND


              BY:  /s/Marie E. Connolly*
                   __________________________________________
                   MARIE E. CONNOLLY, PRESIDENT

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

        Signatures                     Title                      Date
__________________________      _______________________________ _________

   

/s/Marie E. Connolly*           President and Treasurer          4/23/98
Marie E. Connolly               (Principal Executive, Financial
                                and Accounting Officer)
    
   
/s/Joseph S. DiMartino*         Chairman of the Board of         4/23/98
Joseph S. DiMartino,            Trustees
    
   
/s/David P. Feldman*            Trustee                          4/23/98
David P. Feldman
    
   
/s/John M. Fraser, Jr.*         Trustee                          4/23/98
John M. Fraser, Jr.
    
   
/s/Robert R. Glauber*           Trustee                          4/23/98
Robert R. Glauber
    
   
/s/James F. Henry*              Trustee                          4/23/98
James F. Henry
    
   
/s/Rosalind G. Jacobs*          Trustee                          4/23/98
Rosalind G. Jacobs
    
   
/s/Irving Kristol*              Trustee                          4/23/98
Irving Kristol
    
   
/s/Paul A. Marks*               Trustee                          4/23/98
Paul A. Marks
    
   
/s/Dr. Martin Peretz*           Trustee                          4/23/98
Dr. Martin Peretz
    
   
/s/Bert W. Wasserman*           Trustee                          4/23/98
Bert W. Wasserman

    

*BY:     /s/Michael S. Petrucelli
         Michael S. Petrucelli
         Attorney-in-Fact



                       INDEX OF EXHIBITS



     (11)      Consent of Independent Auditors

     (17)      Financial Data Schedule



               Other Exhibits

              (a)       Power of Attorney

              (b)       Certificate of Secretary






                    CONSENT OF INDEPENDENT AUDITORS



We consent to the reference to our firm under the captions "Condensed
Financial Information" and "Transfer and Dividend Disbursing Agent,
Custodian, Counsel and Independent Auditors" and to the use of our report
dated February 5, 1998, which is incorporated by reference, in this
Registration Statement (Form N-1A No. 2-67061) of Dreyfus Institutional
Money Market Fund.


                                          ERNST & YOUNG LLP

New York, New York
April 23, 1998



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<OVERDIST-NET-GAINS-PRIOR>                           0
<GROSS-ADVISORY-FEES>                              754
<INTEREST-EXPENSE>                                   0
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<AVERAGE-NET-ASSETS>                            150894
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<PER-SHARE-NII>                                   .048
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<PERIOD-END>                               DEC-31-1997
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<INVESTMENTS-AT-VALUE>                          513223
<RECEIVABLES>                                     1334
<ASSETS-OTHER>                                   17189
<OTHER-ITEMS-ASSETS>                                 0
<TOTAL-ASSETS>                                  531746
<PAYABLE-FOR-SECURITIES>                             0
<SENIOR-LONG-TERM-DEBT>                              0
<OTHER-ITEMS-LIABILITIES>                          310
<TOTAL-LIABILITIES>                                310
<SENIOR-EQUITY>                                      0
<PAID-IN-CAPITAL-COMMON>                        531436
<SHARES-COMMON-STOCK>                           531443
<SHARES-COMMON-PRIOR>                           483167
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<INTEREST-INCOME>                                29269
<OTHER-INCOME>                                       0
<EXPENSES-NET>                                    2973
<NET-INVESTMENT-INCOME>                          26296
<REALIZED-GAINS-CURRENT>                             5
<APPREC-INCREASE-CURRENT>                            0
<NET-CHANGE-FROM-OPS>                            26301
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<DISTRIBUTIONS-OF-INCOME>                      (26296)
<DISTRIBUTIONS-OF-GAINS>                             0
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                              POWER OF ATTORNEY

     The undersigned hereby constitute and appoint Marie E. Connolly,
Richard W. Ingram, Christopher J. Kelley, Kathleen K. Morrisey, Michael S.
Petrucelli and Elba Vasquez, and each of them, with full power to act
without the other, his or her true and lawful attorney-in-fact and agent,
with full power of substitution and resubstitution, for him or her, and in
his or her name, place and stead, in any and all capacities (until revoked
in writing) to sign any and all amendments to the Registration Statement of
Dreyfus Institutional Money Market Fund.(including post-effective amendments
and amendments thereto), and to file the same, with all exhibits thereto,
and other documents in connection therewith, with the Securities and
Exchange Commission, granting unto said attorneys-in-fact and agents, and
each of them, full power and authority to do and perform each and every act
and thing ratifying and confirming all that said attorneys-in-fact and
agents or any of them, or their or his or her substitute or substitutes, may
lawfully do or cause to be done by virtue hereof.



/s/ Joseph S. DiMartino                     February 13, 1998
Joseph S. DiMartino


/s/. David P. Feldman                       February 13, 1998
David P. Feldman


/s/ John M. Fraser, Jr.                     February 13, 1998
John M. Fraser, Jr.


/s/ Robert R. Glauber                       February 13, 1998
Robert R. Glauber


/s/ James F. Henry                          February 13, 1998
James F. Henry


/s/ Rosalind G. Jacobs                      February 13, 1998
Rosalind G. Jacobs


/s/ Irving Kristol                          February 13, 1998
Irving Kristol


/s/ Paul A. Marks                           February 13, 1998
Paul A. Marks


/s/ Martin Peretz                           February 13, 1998
Martin Peretz


/s/ Bert Wasserman                          February 13, 1998
Bert W. Wasserman










               ASSISTANT SECRETARY'S CERTIFICATE

     I, Michael S. Petrucelli, Assistant Secretary of Dreyfus Institutional
Money Market Fund. hereto (the "Fund"), hereby certify that by Written
Consent dated February 13, 1998, the following resolution was adopted and
remains in full force and effect:

     RESOLVED,  that the Registration Statement and any and all
     amendments and supplements thereto may be signed by any one of
     Marie E. Connolly, Richard W. Ingram, Christopher J. Kelley,
     Kathleen K. Morrisey, Michael S. Petrucelli and Elba Vasquez, as
     the attorney-in-fact for the proper officers of the Fund, with
     full power of substitution and resubstitution; and that the
     appointment of each of such persons as such attorney-in-fact
     hereby is authorized and approved; and that such attorneys-in-
     fact, and each of them, shall have full power and authority to do
     and perform each and every act and thing requisite and necessary
     to be done in connection with such Registration Statement and any
     and all amendments and supplements thereto, as whom he or she is
     acting as attorney-in-fact, might or could do in person.


     IN WITNESS WHEREOF, I have hereunto set my hand as Assistant Secretary
of the Funds and affixed the seal this 23rd day of April, 1998.


                                   /s/ Michael Petrucelli
                                   MICHAEL S. PETRUCELLI


(SEAL)
DREYFUS INSTITUTIONAL MONEY MARKET FUND




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