DREYFUS INSTITUTIONAL MONEY MARKET FUND INC
485APOS, 1999-03-18
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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. 32                                  [X]
    

                                   and/or

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

     Amendment No. 32                                                 [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)
     ----
   
          on     (date)      pursuant to paragraph (b)
     ----
    

          60 days after filing pursuant to paragraph (a)(i)
     ----
   
       X  on May 1, 1999 pursuant to paragraph (a)(i)
     ----
    

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



Dreyfus Institutional Money Market Fund

Seeking a high level of current income and a stable $1.00 share price

PROSPECTUS May 1, 1999

(reg.tm)

As with all mutual funds, the Securities and Exchange Commission has not
approved or disapproved these securities or passed upon the adequacy of this
prospectus. Any representation to the contrary is a criminal offense.







<PAGE>

Dreyfus Institutional Money Market Fund
                     -------------------------------------------------------

                                             Money Market Series:     DMSXX

                                     Government Securities Series:   DINXX

Contents

The Fund
- --------------------------------------------------------------------------------

Dreyfus Institutional Money Market Fund                                      3

Money Market Series                                                          4

Government Securities Series                                                 5

Management                                                                   6

Financial Highlights                                                         7

Your Investment
- --------------------------------------------------------------------------------

Account Policies                                                             8

Distributions and Taxes                                                     10

Services for Fund Investors                                                 10

Instructions for Accounts                                                   11

For More Information
- --------------------------------------------------------------------------------

INFORMATION ON THE FUND'S RECENT STRATEGIES AND HOLDINGS CAN BE FOUND IN THE
CURRENT ANNUAL/SEMIANNUAL REPORT. SEE BACK COVER.



<PAGE>

GOAL/APPROACH

The fund seeks as high a level of current income as is consistent with the
preservation of capital and the maintenance of liquidity. As a money market
fund, the fund is subject to maturity, quality and diversification requirements
designed to help it maintain a stable share price of $1.00.

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 a diversified portfolio of high-quality,
short-term debt securities, including the following:

(pound)  securities issued or guaranteed by the U.S. government or its agencies

(pound)  certificates of deposit, time deposits, bankers'  acceptances and
         other short-term securities issued by domestic banks or London branches
         of domestic banks

(pound)  repurchase agreements

(pound)  asset-backed securities

(pound)  commercial paper and other short-term corporate obligations of domestic
         issuers, including those with floating or variable rates of interest

Normally, the Money Market Series invests at least 25% of its total assets in
bank obligations.

THE GOVERNMENT SECURITIES SERIES invests only in short-term securities issued or
guaranteed as to principal and interest by the U.S. government, and repurchase
agreements in respect of these securities.

MAIN RISKS

An investment in the Money Market Series or Government Securities Series is not
insured or guaranteed by the Federal Deposit Insurance Corporation or any other
government agency. Although each series seeks to preserve the value of your
investment at $1.00 per share, it is possible to lose money by investing in
either series. Additionally, each series' yield will vary as the short-term
securities in its portfolio mature and the proceeds are reinvested in securities
with different interest rates.

While each series has maintained a constant share price since inception, and
will continue to try to do so, the following factors could reduce the series'
income level and/or share price:

(pound)  interest rates could rise sharply, causing the value of the series'
         securities, and share price, to drop

(pound)  any of the Money Market Series and any of The Government Securities
         Series' repurchase agreement holdings could have its credit rating
         Downgraded or could default

(pound)  as to the Money Market Series, the risks generally associated with
         concentrating investments in the banking industry, such as interest
rate
         risk, credit risk and regulatory developments relating to the banking
         industry

(pound)  as to the Money Market Series, the risks generally associated with
         dollar-denominated securities issued by London branches of domestic
banks,
         such as economic and political developments, seizure or nationalization
of
         deposits, imposition of taxes or other restrictions on the payment of
         principal and interest

Concepts to understand

MONEY MARKET FUND: a specific type of fund that seeks to maintain a $1.00 price
per share. Money market funds are subject to strict federal requirements and
must:

(pound) maintain an average dollar-weighted portfolio maturity of 90 days or
        less

(pound) buy individual securities that have remaining maturities of 13 months or
less

(pound) invest only in high-quality dollar-denominated obligations

Concepts to understand

CREDIT RATING: a measure of the issuer's expected ability to make all required
interest and principal payments in a timely manner.

An issuer with the highest credit rating has a very strong degree of certainty
(or safety) with respect to making all payments. An issuer with the
second-highest credit rating has a strong capacity to make all payments, but the
degree of safety is somewhat less.

Generally, each series is required to invest at least 95% of its assets in the
securities of issuers with the highest credit rating or the unrated equivalent
as determined by Dreyfus, with the remainder invested in securities with the
second-highest credit rating.

The Fund




<PAGE 3>

Money Market Series




PAST PERFORMANCE

The two tables below show the series' annual returns and long-term performance.
The first table shows how performance has varied from year to year. The second
averages performance over time. Both tables assume reinvestment of dividends and
distributions. As with all mutual funds, the past is not a prediction of the
future.
- --------------------------------------------------------------------------------

Year-by-year total return AS OF 12/31 EACH YEAR (%)
[Exhibit A]
BEST QUARTER:                    Q2 '89                     +2.36%

WORST QUARTER:                   Q2 '93                     +0.67%

The series' 7-day yield on 12/31/98 was 4.66%. For the series' current yield,
call toll-free 1-800-645-6561.
- --------------------------------------------------------------------------------

Average annual total return AS OF 12/31/98

1 Year                            5 Years                        10 Years
- --------------------------------------------------------------------------------

5.14%                             4.91%                           5.36%

EXPENSES

Fund investors pay certain fees and expenses in connection with the fund, which
are described in the table below. Shareholder transaction fees are paid from an
investor's account. Annual fund operating expenses are paid out of fund assets,
so their effect is included in the share price. The fund has no sales charge
(load) or Rule 12b-1 distribution fees.
- --------------------------------------------------------------------------------

Fee table

SHAREHOLDER TRANSACTION FEES                                             NONE

% OF TRANSACTION AMOUNT
- --------------------------------------------------------------------------------

ANNUAL FUND OPERATING EXPENSES

% OF AVERAGE DAILY NET ASSETS

Management fees                                                         0.50%

Shareholder services fee                                                0.01%

Other expenses                                                          0.06%
- --------------------------------------------------------------------------------

TOTAL                                                                   0.57%
- --------------------------------------------------------------------------------

Expense example
<TABLE>

1 Year                               3 Years                              5 Years                              10 Years
- ---------------------------------------------------------------------------------------------------------------------------------
<S>                                  <C>                                  <C>                                  <C>
$58                                  $183                                 $318                                 $714
</TABLE>

This example shows what an investor could pay in expenses over time. It uses
the same hypothetical conditions other funds use in their prospectuses: $10,000
initial investment, 5% total return each year and no changes in expenses. The
figures shown would be the same whether the investor sold their shares at the
end of a period or kept them. Because actual return and expenses will be
different, the example is for comparison only.

What this fund is -- and isn't

This series is a mutual fund: a pooled investment that is professionally managed
and gives an investor the opportunity to participate in financial markets. It
strives to reach its stated goal, although as with all mutual funds, it cannot
offer guaranteed results.

An investment in this fund is not a bank deposit. It is not insured or
guaranteed by the FDIC or any other government agency. It is not a complete
investment program. An investor could lose money in this fund, but also has the
potential to make money.

Concepts to understand

MANAGEMENT FEE: the fee paid to the investment adviser for managing the fund's
portfolio and assisting in all aspects of the fund's operations.

SHAREHOLDER SERVICES FEE: a fee of up to 0.25% used to reimburse Dreyfus Service
Corporation for shareholder account service and maintenance.

OTHER EXPENSES: fees paid by the fund for miscellaneous items such as transfer
agency, custody, professional and registration fees.









<PAGE 4>

Government Securities Series

PAST PERFORMANCE

The two tables below show the series' annual returns and long-term performance.
The first table shows how performance has varied from year to year. The second
averages performance over time. Both tables assume reinvestment of dividends and
distributions. As with all mutual funds, the past is not a prediction of the
future.
- --------------------------------------------------------------------------------

Year-by-year total return AS OF 12/31 EACH YEAR (%)
[Exhibit B]
BEST QUARTER:                    Q2 '89                     +2.26%

WORST QUARTER:                   Q3 '93                     +0.63%

The series' 7-day yield on 12/31/98 was 4.16%. For the series' current yield,
call toll-free 1-800-645-6561.
- --------------------------------------------------------------------------------

Average annual total return AS OF 12/31/98

1 Year                            5 Years                        10 Years
- --------------------------------------------------------------------------------

4.87%                              4.70%                           5.19%

EXPENSES

Fund investors pay certain fees and expenses in connection with the fund, which
are described in the table below. Shareholder transaction fees are paid from an
investor's account. Annual fund operating expenses are paid out of fund assets,
so their effect is included in the share price. The fund has no sales charge
(load) or Rule 12b-1 distribution fees.
- --------------------------------------------------------------------------------

Fee table

SHAREHOLDER TRANSACTION FEES

% OF TRANSACTION AMOUNT                                                  0.00%
- --------------------------------------------------------------------------------

ANNUAL FUND OPERATING EXPENSES

% OF AVERAGE DAILY NET ASSETS

Management fees                                                          0.50%

Shareholder services fee                                                 0.01%

Other expenses                                                           0.17%
- --------------------------------------------------------------------------------

TOTAL                                                                    0.68%
- --------------------------------------------------------------------------------

Expense example
<TABLE>

1 Year                                         3 Years                            5 Years                            10 Years
- ---------------------------------------------------------------------------------------------------------------------------------
<S>                                            <C>                                 <C>                               <C>
$69                                            $219                                $379                              $847
</TABLE>

This example shows what you could pay in expenses over time. It uses the same
hypothetical conditions other funds use in their prospectuses: $10,000 initial
investment, 5% total return each year and no changes in expenses. The figures
shown would be the same whether you sold your shares at the end of a period or
kept them. Because actual return and expenses will be different, the example is
for comparison only.

What this fund is -- and isn't

This series is a mutual fund: a pooled investment that is professionally managed
and gives you the opportunity to participate in financial markets. It strives to
reach its stated goal, although as with all mutual funds, it cannot offer
guaranteed results.

An investment in this fund is not a bank deposit. It is not insured or
guaranteed by the FDIC or any other government agency. It is not a complete
investment program. You could lose money in this fund, but you also have the
potential to make money.

Concepts to understand

MANAGEMENT FEE: the fee paid to the investment adviser for managing the fund's
portfolio and assisting in all aspects of the fund's operations.

SHAREHOLDER SERVICES FEE: a fee of up to 0.25% used to reimburse Dreyfus Service
Corporation for shareholder account service and maintenance.

OTHER EXPENSES: fees paid by the fund for miscellaneous items such as transfer
agency, custody, professional and registration fees.

The Fund








<PAGE 5>

MANAGEMENT

The investment adviser for the fund is The Dreyfus Corporation, 200 Park Avenue,
New York, New York 10166. Founded in 1947, Dreyfus manages one of the nation's
leading mutual fund complexes, with more than $121 billion in more than 163
mutual fund portfolios. Dreyfus is the primary mutual fund business of Mellon
Bank Corporation, a broad-based financial services company with a bank at its
core. With more than $350 billion of assets under management and $1.7 trillion
of assets under administration and custody, Mellon provides a full range of
banking, investment and trust products and services to individuals, businesses
and institutions. Its mutual fund companies place Mellon as the leading bank
manager of mutual funds. Mellon is headquartered in Pittsburgh, Pennsylvania.

Management philosophy

The Dreyfus asset management philosophy is based on the belief that discipline
and consistency are important to investment success. For each fund, the firm
seeks to establish clear guidelines for portfolio management and to be
systematic in making decisions. This approach is designed to provide each fund
with a distinct, stable identity.

Concepts to understand

YEAR 2000 ISSUES: the fund could be adversely affected if the computer systems
used by Dreyfus and the fund's other service providers do not properly process
and calculate date-related information from and after January 1, 2000.

Dreyfus is working to avoid year 2000-related problems in its systems and to
obtain assurances from other service providers that they are taking similar
steps. In addition, issuers of securities in which the fund invests may be
adversely affected by year 2000-related problems. This could have an impact on
the value of the fund's investments and its share price.




<PAGE 6>

FINANCIAL HIGHLIGHTS

The following tables describe each series' performance for the fiscal periods
indicated. "Total return" shows how much an investment in a series would have
increased (or decreased) during each period, assuming reinvestment of all
dividends and distributions. These figures have been independently audited by
Ernst & Young LLP, whose report, along with each series' financial statements,
is included in the fund's annual report.
<TABLE>
                                                                                         YEAR ENDED DECEMBER 31,

 MONEY MARKET SERIES                                                          1998       1997       1996      1995       1994
- --------------------------------------------------------------------------------------------------------------------------------
<S>                                                                           <C>        <C>       <C>        <C>        <C>
PER-SHARE DATA ($)

 Net asset value, beginning of period                                         1.00       1.00      1.00       1.00       1.00

 Investment operations:  Investment income -- net                             .050       .051      .049       .054       .036

 Distributions:          Dividends from investment income -- net             (.050)     (.051)    (.049)     (.054)     (.036)

                         Net asset value, end of period                       1.00       1.00      1.00       1.00       1.00

 Total return (%)                                                             5.14       5.17      5.03       5.57       3.65
- ---------------------------------------------------------------------------------------------------------------------------------

RATIOS/SUPPLEMENTAL DATA

 Ratio of expenses to average net assets (%)                                   .57        .57       .58        .62        .63

 Ratio of net investment income to average net assets (%)                     5.02       5.06      4.91       5.43       3.59
- --------------------------------------------------------------------------------------------------------------------------------

 Net assets, end of period ($ x 1,000)                                     540,282    531,436   483,156    402,032    362,825

                                                                                              YEAR ENDED DECEMBER 31,

 GOVERNMENT SECURITIES SERIES                                                 1998       1997       1996      1995       1994
- --------------------------------------------------------------------------------------------------------------------------------

PER-SHARE DATA ($)

 Net asset value, beginning of period                                         1.00       1.00      1.00       1.00       1.00

 Investment operations:  Investment income -- net                             .048       .048      .047       .052       .034

 Distributions:          Dividends from investment income -- net             (.048)     (.048)    (.047)     (.052)     (.034)

                         Net asset value, end of period                       1.00       1.00      1.00       1.00       1.00

 Total return (%)                                                             4.87       4.95      4.84       5.36       3.49
- --------------------------------------------------------------------------------------------------------------------------------

RATIOS/SUPPLEMENTAL DATA

 Ratio of expenses to average net assets                                       .68        .61       .63        .65        .69

 Ratio of net investment income to average net assets                         4.76       4.84      4.74       5.23       3.40
- --------------------------------------------------------------------------------------------------------------------------------

 Net assets, end of period ($ x 1,000)                                      68,615    107,694   102,726    123,171    120,281

</TABLE>

The Fund



<PAGE 7>

Your Investment

ACCOUNT POLICIES

Buying shares

INVESTORS PAY NO SALES CHARGES to invest in this fund. The price for fund shares
is the net asset value per share (NAV) for the shares purchased. The NAV
generally is calculated twice a day at 12:00 noon Eastern time and as of the
close of trading on the floor of the New York Stock Exchange (currently 4:00
p.m. Eastern time). Orders (except through TeleTransfer) will be priced at the
NAV next calculated after they are accepted by the fund's transfer agent or
other authorized entity. The fund's investments are valued based on amortized
cost.
- --------------------------------------------------------------------------------

Minimum investments

                                Initial            Additional
- --------------------------------------------------------------------------------

REGULAR ACCOUNTS                $50,000            $100

DREYFUS AUTOMATIC               $100               $100
INVESTMENT PLANS

All investments must be in U.S. dollars. Third-party checks cannot be accepted.
Investors may be charged a fee for any check that does not clear. Maximum
TeleTransfer purchase is $150,000 per day.

Selling shares

INVESTORS MAY SELL SHARES AT ANY TIME. Shares will be sold at the next NAV
calculated after a sale order is accepted by the fund's transfer agent or other
authorized entity. Any certificates representing fund shares being sold must be
returned with the redemption request. Orders will be processed promptly and
investors will generally receive the proceeds within a week.

BEFORE SELLING RECENTLY PURCHASED SHARES, investors should note that if the fund
has not yet collected payment for the shares being sold, it may delay sending
the proceeds for up to eight business days or until it has collected payment.
- --------------------------------------------------------------------------------

Limitations on selling shares by phone

Proceeds
sent by                 Minimum                Maximum
- --------------------------------------------------------------------------------

CHECK                   NO MINIMUM             $150,000 PER DAY

WIRE                    $1,000                 $250,000 FOR JOINT ACCOUNTS
                                               EVERY 30 DAYS

TELETRANSFER            $500                   $250,000 FOR JOINT ACCOUNTS
                                               EVERY 30 DAYS

Concepts to understand

NET ASSET VALUE (NAV): a mutual fund's share price on a given day. A fund's NAV
is calculated by dividing the value of its net assets by the number of existing
shares.

AMORTIZED COST: a method of valuing a money market fund's portfolio securities,
which does not take into account unrealized gains and losses. As a result,
portfolio securities are valued at their acquisition cost, adjusted over time
based on the discounts or premiums reflected in their purchase price. This
method of valuation is designed to permit a fund to be able to maintain a stable
net asset value.

Written sell orders

Some circumstances require written sell orders along with signature guarantees.
These include:

(pound) amounts of $1,000 or more on accounts whose address  has been changed
        within the last 30 days

(pound) requests to send the proceeds to a different payee or address

Written sell orders of $100,000 or more must also be signature guaranteed.

A SIGNATURE GUARANTEE helps protect against fraud. You can obtain one from most
banks or securities dealers, but not from a notary public. For joint accounts,
each signature must be guaranteed. Please call us to ensure that your signature
guarantee will be processed correctly.






<PAGE 8>

DISTRIBUTIONS AND TAXES

THE FUND USUALLY DISTRIBUTES to its shareholders dividends from its net
investment income once a month and distributes any net capital gains that it has
realized once a year. Dividends and distributions will be reinvested in the fund
unless the investor instructs the fund otherwise. There are no fees or sales
charges on reinvestments.

THE QUARTERLY DISTRIBUTION PLAN permits you to receive quarterly payments from
the fund, if you have proceeds from the sale of shares bought through automatic
reinvestment of dividends. Contact the fund's transfer agent to open a quarterly
distribution plan.

DIVIDENDS AND DISTRIBUTIONS ARE TAXABLE to most shareholders as ordinary income
(unless an investment is in an IRA or other tax-advantaged account). The tax
status of any distribution is the same regardless of how long an investor has
been in the fund and whether distributions are reinvested or taken in cash. The
tax status of dividends and distributions will be detailed in annual tax
statements from the fund.

Because everyone's tax situation is unique, an investor should always consult a
tax professional about federal, state and local tax consequences.

General policies

UNLESS AN INVESTOR DECLINES TELEPHONE PRIVILEGES on the application, the
investor may be responsible for any fraudulent telephone order as long as
Dreyfus takes reasonable measures to verify the order.

EACH FUND RESERVES THE RIGHT TO:

(pound)  refuse any purchase or exchange request

(pound)  change or discontinue its exchange privilege

(pound)  change its minimum investment amounts

(pound)  delay sending out redemption proceeds for up to seven days (generally
         applies only in cases of very large redemptions, excessive trading or
         during unusual market conditions)

The fund also reserves the right to make a "redemption in kind" -- payment in
portfolio securities rather than cash -- if the amount the investor is redeeming
is large enough to affect fund operations (for example, if it represents more
than 1% of the fund's assets).

Small account policies

To offset the relatively higher costs of servicing smaller accounts, the fund
charges regular accounts with balances below $2,000 an annual fee of $12. The
fee will be imposed during the fourth quarter of each calendar year.

The fee will be waived for: any investor whose aggregate Dreyfus mutual fund
investments total at least $25,000; IRA accounts; accounts participating in
automatic investment programs; accounts opened through a financial institution.

If your account falls below $500, the fund may ask you to increase your balance.
If it is still below $500 after 30 days, the fund may close your account and
send you the proceeds.

Third-party investments

Investments made through a third party (rather than directly with Dreyfus) may
be subject to policies and fees different than those described here. Banks,
brokers, 401(k) plans, financial advisers and financial supermarkets may charge
transaction fees and may set different minimum investments or limitations on
buying or selling shares. Investors should consult a representative of the plan
or financial institution if in doubt.

Your Investment



<PAGE 9>

SERVICES FOR FUND INVESTORS

THE THIRD PARTY THROUGH WHOM YOU PURCHASED fund shares may impose different
restrictions on these services and privileges offered by the fund, or may not
make them available at all.  Consult your financial representative for more
information on the availability of these services and privileges.

Automatic services

BUYING OR SELLING SHARES AUTOMATICALLY is easy with the services described
below.  With each service, you select a schedule and amount, subject to certain
restrictions. You can set up most of these services with your application, or by
calling your financial representative or 1-800-554-4611.
- --------------------------------------------------------------------------------

For investing

DREYFUS AUTOMATIC               For making automatic investments
ASSET BUILDER((reg.tm))         from a designated bank account.

DREYFUS PAYROLL                 For making automatic investments
SAVINGS PLAN                    through a payroll deduction.

DREYFUS GOVERNMENT              For making automatic investments
DIRECT DEPOSIT                  from your federal employment,
PRIVILEGE                       Social Security or other regular
                                federal government check.

DREYFUS DIVIDEND                For automatically reinvesting the
SWEEP                           dividends and distributions from
                                one Dreyfus fund into another
                                (not available for IRAs).
- --------------------------------------------------------------------------------

For exchanging shares

DREYFUS AUTO-                   For making regular exchanges
EXCHANGE PRIVILEGE              from one Dreyfus fund into
                                another.
- --------------------------------------------------------------------------------

For selling shares

DREYFUS AUTOMATIC               For making regular withdrawals
WITHDRAWAL PLAN                 from most Dreyfus funds.

Checkwriting privilege

YOU MAY WRITE REDEMPTION CHECKS against your account in amounts of $500 or more.
These checks are free; however, a fee will be charged if you request a stop
payment or if the transfer agent cannot honor a redemption check due to
insufficient funds or another valid reason. Please do not postdate your checks
or use them to close your account.

Exchange privilege

INVESTORS CAN EXCHANGE $500 OR MORE from one Dreyfus fund into certain others
(no minimum for retirement accounts). Investors can request an exchange in
writing or by phone. Be sure to read the current prospectus for any fund into
which you are exchanging. Any new account established through an exchange will
have the same privileges as an original account (as long as they are available).
There is currently no fee for exchanges, although an investor may be charged a
sales load when exchanging into any fund that has one.

Dreyfus Auto-Exchange privilege

DREYFUS AUTO-EXCHANGE PRIVILEGE ENABLES an investor to invest regularly (on a
semi-monthly, quarterly or annual basis), in exchange for shares of a fund, in
shares of certain other Dreyfus funds. There is currently no fee for this
privilege.

Other automatic services

CERTAIN OTHER SERVICES FOR BUYING AND SELLING shares automatically are offered
by the funds. See the Statement of Additional Information (SAI) for further
information.





<PAGE 10>

INSTRUCTIONS FOR ACCOUNTS

   TO OPEN AN ACCOUNT

            In Writing

   Complete the application.

   Mail your application and a check to:
   The Dreyfus Family of Funds

   P.O. Box 9387, Providence, RI 02940-9387


TO ADD TO AN ACCOUNT

Fill out an investment slip, and write your account number on your check.

Mail the slip and the check to: The Dreyfus Family of Funds

P.O. Box 105, Newark, NJ 07101-0105


           By Telephone

   WIRE  Have your bank send your
investment to The Bank of New York, with these instructions:

   * ABA# 021000018

   * Money Market Series
DDA# 8900051922

   * Government Securities Series
DDA# 8900051949

   * your Social Security or tax ID number

   * name(s) of investor(s)

   Call us to obtain an account number. Return your application.

WIRE  Have your bank send your investment to The Bank of New York, with these
instructions:

* ABA# 021000018

* Money Market Series DDA# 8900051922

* Government Securities Series DDA# 8900051949

* your account number

* name(s) of investor(s)

ELECTRONIC CHECK  Same as wire, but before your account number insert "1111"

TELETRANSFER  Request TeleTransfer on your application. Call us to request your
transaction.

           Automatically

   WITH AN INITIAL INVESTMENT  Indicate on your application which automatic
service(s) you want. Return your application with your investment.

ALL SERVICES  Call us to request a form to add any automatic investing service
(see "Services for Fund Investors"). Complete and return the form along with any
other required materials.

TO SELL SHARES

Write a letter of instruction that includes:

* your name(s) and signature(s)

* your account number

* the fund name

* the dollar amount you want to sell

* how and where to send the proceeds

Obtain a signature guarantee or other  documentation, if required (see page 11)

Mail your request to:  The Dreyfus Family of Funds P.O. Box 9671, Providence, RI
02940-9671


WIRE  Be sure the fund has your bank account information on file. Call us to
request your transaction. Proceeds will be wired to your bank.

TELETRANSFER  Be sure the fund has your bank account information on file. Call
us to request your transaction. Proceeds will be sent to your bank by electronic
check.

CHECK  Call us to request your transaction. A check will be sent to the address
of record.

AUTOMATIC WITHDRAWAL PLAN  Call us to request a form to add the plan. Complete
the form, specifying the amount and frequency of withdrawals you would like.

Be sure to maintain an account balance of $10,000 or more.

To open an account, make subsequent investments or to sell shares, please
contact your financial representative  or call toll free in the U.S.
1-800-554-4611. Make checks payable to: THE DREYFUS FAMILY OF FUNDS

To open an account, make subsequent investments or to sell shares, please
contact your financial representative  or call toll free in the U.S.
1-800-554-4611. Make checks payable to: THE DREYFUS FAMILY OF FUNDS

Concepts to understand

WIRE TRANSFER: for transferring money from one financial institution to another.
Wiring is the fastest way to move money, although your bank may charge a fee to
send or receive wire transfers. Wire redemptions from the fund are subject to a
$1,000 minimum.

ELECTRONIC CHECK: for transferring money out of a bank account. Your transaction
is entered electronically, but may take up to eight business days to clear.
Electronic checks usually are available without a fee at all Automated Clearing
House (ACH) banks.

Your Investment








<PAGE 11>

For More Information

Dreyfus Institutional Money Market Fund
- --------------------------------------

SEC file number:  811-3025

More information on this fund is available free upon request, including the
following:

Annual/Semiannual Report

Describes the fund's performance, lists portfolio holdings and contains a letter
from the fund's  manager discussing recent market conditions,  economic trends
and fund strategies that significantly affected the fund's performance during
the last fiscal year.

Statement of Additional Information (SAI)

Provides more details about the fund and its policies. A current SAI is on file
with the Securities and Exchange Commission (SEC) and is incorporated by
reference (is legally considered part of this prospectus).

To obtain information:

BY TELEPHONE Call 1-800-242-8671

BY MAIL  Write to:  The Dreyfus Family of Funds 144 Glenn Curtiss Boulevard
Uniondale, NY 11556-0144

ON THE INTERNET  Text-only versions of fund documents can be viewed online or
downloaded from: http://www.sec.gov

You can also obtain copies by visiting the SEC's Public Reference Room in
Washington, DC (phone 1-800-SEC-0330) or by sending your request and a
duplicating fee to the SEC's Public Reference Section, Washington, DC
20549-6009.

(c) 1999, Dreyfus Service Corporation
179P0599

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<PAGE>


____________________________________________________________________________


                   DREYFUS INSTITUTIONAL MONEY MARKET FUND
   

                        GOVERNMENT SECURITIES SERIES
                             MONEY MARKET SERIES
    
   

                     STATEMENT OF ADDITIONAL INFORMATION
                                 MAY 1, 1999
    
____________________________________________________________________________
   

     This Statement of Additional Information, which is not a prospectus,
supplements and should be read in conjunction with the current Prospectus of
the Government Securities Series and Money Market Series (each, a "series")
of Dreyfus Institutional Money Market Fund (the "Fund"), dated May 1, 1999,
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 one of 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 Fund's most recent Annual Report and Semi-Annual Report to
Shareholders are separate documents supplied with this Statement of
Additional Information, and the financial statements, accompanying notes and
report of independent auditors appearing in the Annual Report are
incorporated by reference into this Statement of Additional Information.
    
   

                       TABLE OF CONTENTS
                                                        Page

Description of the Fund and Series                      B-2
Management of the Fund                                  B-7
Management Arrangements                                 B-13
How to Buy Shares                                       B-15
Shareholder Services Plan                               B-17
How to Redeem Shares                                    B-18
Shareholder Services                                    B-20
Portfolio Transactions                                  B-23
Determination of Net Asset Value                        B-23
Yield Information                                       B-25
Information About the Fund and Series                   B-25
Counsel and Independent Auditors                        B-27
Appendix                                                B-28
    
   
                     DESCRIPTION OF THE FUND AND SERIES
    
   
     The Fund was incorporated under Maryland law on March 19, 1980.  The
Fund began offering shares of the Government Securities Series on April 1,
1982, and shares of the Money Market Series on May 4, 1982.  On April 27,
1987, the Fund was reorganized as a Massachusetts business trust.  The Fund
is an open-end management investment company, known as a money market mutual
fund.  The Fund is a diversified fund, which means that, with respect to 75%
of its total assets, the Fund will not invest more than 5% of its assets in
the securities of any single issuer.
    

     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.
   

Certain Portfolio Securities
    
   

     The following information supplements and should be read in conjunction
with the Fund's Prospectus.
    
   
     U.S. Government Securities.  Each series may invest in securities
issued or guaranteed by the U.S. Government or its agencies or
instrumentalities, which include U.S. Treasury securities that differ in
their interest rates, maturities and times of issuance.  The 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.
    
   
     Bank Obligations.  (Money Market Series only)  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.
    
   

     Certificates of deposit ("CDs") are negotiable certificates evidencing
the obligation of a bank to repay funds deposited with it for a specified
period of time.
    
   
     Time deposits ("TDs") 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.
    
   
     Investments in TDs and CDs are limited to domestic banks having total
assets in excess of $1 billion and London branches of such domestic banks.
    
   
     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.
    

     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; Securities of Supranational Entities.
(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.  Each series may enter into repurchase
agreements.  In a repurchase agreement, the 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.
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.  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.  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.  The
series may enter into repurchase agreements with certain banks or non-bank
dealers.
    
   
     Commercial Paper.  (Money Market Series only)  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 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 corporations, including banks.
    
   
     Floating and Variable Rate Obligations.  (Money Market Series only)
The Money Market Series may purchase floating and variable rate 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 at 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 a risk that should the series desire to sell them
when a ready buyer is not available at a price the series deems
representative of their value, the value of the series' net assets could be
adversely affected.
    
   
Investment Techniques
    
   
     The following information supplements and should be read in conjunction
with the Fund's Prospectus.
    
   
     Borrowing Money.  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 borrowings exceed 5% of the series' total
assets, the series will not make any additional investments.
    
   
     Lending Portfolio Securities.  (Government Securities Series only) 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.  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.
    
   
Investment Considerations and Risks
    
   
     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
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 the 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
Manager.  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 size of the
position obtained for or disposed of by the Fund or the price paid or
received by the Fund.
    

Investment Restrictions
   

     The Fund's investment objective is a fundamental policy, 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.  In addition, 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.  Investment
restriction number 11 is not a fundamental policy and may be changed, as to
a series, by a 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.
   
    



                           MANAGEMENT OF THE FUND
   

     The Fund's Board is responsible for the management and supervision of
the Fund.  The Board approves all significant agreements between the Fund
and those companies that furnish services to the Fund.  These companies are
as follows:


     The Dreyfus Corporation            Investment Adviser
     Premier Mutual Fund Services, Inc. Distributor
     Dreyfus Transfer, Inc.             Transfer Agent
     The Bank of New York               Custodian

    

     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 chairman of The Measurisk Group, a risk measurement
     advisory and software development firm, co-chairman of the Investment
     Committee, Massachusetts Statement Retirement Fund, and is also a
     director of The Dun & Bradstreet Corp., Exel Limited, a Bermuda-based
     insurance company, Cooke and Bieler, Inc., investment counselors,
     National Association of Securities Dealers, Inc., NASD Regulation, Inc.
     and the Federal Reserve Bank of Boston.  He is a member of the Council
     on Foreign Relations, Boston Committee on Foreign Relations and
     treasurer of The Boston Economic Club.  Mr. Glauber is 59 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.
   
    

     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, 1998, 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          $                     $ (  )

David P. Feldman             $                     $ (  )

John M. Fraser, Jr.          $                     $ (  )

Robert R. Glauber            $                     $ (  )

James F. Henry               $                     $ (  )

Rosalind Gersten Jacobs      $                     $ (  )


Irving Kristol               $                     $ (  )

Dr. Paul A. Marks            $                     $ (  )

Dr. Martin Peretz            $                     $ (  )

Bert W. Wasserman            $                     $ (  )
_______________________

*    Amount does not include reimbursed expenses for attending Board
     meetings, which amounted to $          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 41 years old.
    
   
MARGARET W. CHAMBERS, Vice President and Secretary.  Senior Vice President
     and General Counsel of Funds Distributor, Inc., and an officer of other
     investment companies advised or administered by the Manager.  From
     August 1996 to March 1998, she was Vice President and Assistant General
     Counsel for Loomis, Sayles & Company, L.P.  From January 1986 to July
     1996, she was an associate with the law firm of Ropes & Gray.  She is
     38 years old.
    
   
MICHAEL S. PETRUCELLI, Vice President, Assistant Secretary and Assistant
     Treasurer.  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 by
     GE Investment Services 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.
    
   
STEPHANIE D. PIERCE, Vice President, Assistant Secretary and Assistant
     Treasurer.  Vice President and Client Development Manager of Funds
     Distributor, Inc., and an officer of other investment companies advised
     or administered by the Manager.  From April 1997 to March 1998, she was
     employed as a Relationship Manager with Citibank, N.A.  From August
     1995 to April 1997, she was an Assistant Vice President with Hudson
     Valley Bank, and from September 1990 to August 1995, she was Second
     Vice President with Chase Manhattan Bank.  She is 30 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 34 years old.
    
   
GEORGE A. RIO, Vice President and Assistant Treasurer.  Executive Vice
     President and Client Service Director of Funds Distributor, Inc., and
     an officer of other investment companies advised or administered by the
     Manager.  From June 1995 to March 1998, he was Senior Vice President
     and Senior Key Account Manager for Putnam Mutual Funds.  From May 1994
     to June 1995, he was Director of Business Development for First Data
     Corporation.  From September 1983 to May 1994, he was Senior Vice
     President and Manager of Client Services and Director of Internal Audit
     at The Boston Company, Inc.  He is 43 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 36 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.  He is 29 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.  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 26 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 37
     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 _______________, 1999.
    
   
     The following are known by the Fund to own of record 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 - _______%.  Government
Securities Series:  Cudd & Co., Chase Manhattan Bank, 1211 Avenue of
Americas, New York, NY 10036 - _______%; Iovine Family Revocable Trust, c/o
CB&G, 1990 S. Bundy Dr., Los Angeles, CA 90025 - _______%; Chase Manhattan
Bank, Client Services, 1211 Avenue of the Americas, New York, NY 10036 -
_______%; The Bear Stearns Companies, Inc., Profit Sharing Plan, Profit
Sharing Account, 155 S. Jefferson Road, Whippany, NJ 07981 - _______%;
Fiduciary Trust Co. International Customers Account, P.O. Box 3199, New York
NY 10008 - _______%.  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 ARRANGEMENTS
    
   
     Investment Adviser.  The Manager is a wholly-owned subsidiary of Mellon
Bank, N.A., which is a wholly-owned subsidiary of Mellon Bank Corporation
("Mellon").  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.
    
   
     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 ___________, 1999.  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:
Christopher M. Condron, Chairman of the Board and Chief Executive Officer;
Stephen E. Canter, President, Chief Operating Officer, Chief Investment
Officer and a director;  Thomas F. Eggers, Vice Chairman-Institutional and a
director; Lawrence S. Kash, Vice Chairman and a director;  J. David Officer,
Vice Chairman and a director;  Ronald P. O'Hanley III, Vice Chairman;
William T. Sandalls, Jr., Executive Vice President;  Mark N. Jacobs, Vice
President, General Counsel and Secretary;  Patrice M. Kozlowski, Vice
President-Corporate Communications;  Mary Beth Leibig, Vice President-Human
Resources;  Andrew S. Wasser, Vice President-Information Systems;  Theodore
A. Schachar, Vice President;  Wendy Strutt, Vice President; Richard Terres,
Vice President;  William H. Maresca, Controller;  James Bitetto, Assistant
Secretary;  Steven F. Newman, Assistant Secretary; and Mandell L. Berman,
Burton C. Borgelt, Steven G. Elliott, Martin C. McGuinn, Richard W. Sabo 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 pay the Distributor for
shareholder services from the Manager's own assets, including past profits
but not including the management fee paid by the Fund.  The Distributor may
use part or all of such payments to pay securities dealers, banks or other
financial institutions in respect of these services.  The Manager also 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 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, 1996, 1997 and 1998 amounted to $2,208,098, $2,597,609
and $_____________, respectively.  The management fees paid by the
Government Securities Series to the Manager for the fiscal years ended
December 31, 1996, 1997 and 1998 amounted to $761,707, $754,470 and
$__________, 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.
   
    
   
     Distributor.  The Distributor, located at 60 State Street, Boston,
Massachusetts 02109, serves as the Fund's distributor on a best efforts
basis pursuant to an agreement which is renewable annually.
    
   
     Transfer and Dividend Disbursing Agent and Custodian.  Dreyfus
Transfer, Inc. (the "Transfer Agent"), 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.
    
   
     The Bank of New York (the "Custodian"), 90 Washington Street, New York,
New York 10286, is the Fund's custodian.  The Custodian has no part in
determining the investment policies of the series or which securities are to
be purchased or sold by the series.
    
   

                              HOW TO BUY SHARES
    
   
     General.  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.  Shares also may be
purchased through Dreyfus-Automatic Asset Builderr, 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.
    
   
     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."
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.
Qualified institutions may telephone orders for purchase of either series'
shares.  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.
    
   
     Using Federal Funds.  The Transfer Agent or the Fund may attempt to
notify you 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 you are a customer of a securities dealer, bank or other
financial institution and your order to purchase Fund shares is paid for
other than in Federal Funds, the securities dealer, bank or other financial
institution, acting on your behalf, will complete the conversion into, or
itself advance, Federal Funds generally on the business day following
receipt of your order.  The order is effective only when so converted and
received by the Transfer Agent.  If you have a sufficient Federal Funds or
cash balance in your brokerage account with a securities dealer, bank or
other financial institution, your order to purchase Fund shares will become
effective on the day that the order, including Federal Funds, is received by
the Transfer Agent.
    
   
     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.  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 transaction 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.  You 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 Fund has adopted a Shareholder Services Plan (the "Plan") pursuant
to which the Fund reimburses Dreyfus Service Corporation an amount not to
exceed the annual rate of .25% of the value of each series' average daily
net assets.  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 ___________, 1998.
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, 1998
amounted to $___________ and $__________, respectively.
    


                            HOW TO REDEEM SHARES
   

     Check Redemption Privilege.  The Fund provides Redemption Checks
("Checks") automatically upon opening an account, unless you specifically
refuse 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 your 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 your
agent, will cause the Fund to redeem a sufficient number of shares in your
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 you.
You 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.
    
   
     Checks are free, but the Transfer Agent will impose a fee for stopping
payment of a Check upon your request or if the Transfer Agent cannot honor a
Check due to insufficient funds or other valid reason.  If the amount of the
Check is greater than the value of the shares in your account, the Check
will be returned marked insufficient funds.  Checks should not be used to
close an account.
    
   
     You should date your Redemption Checks with the current date when you
write them.  Please do not postdate your Redemption Checks.  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 of payment, if they are otherwise in good order.
If you hold shares in a Dreyfus sponsored IRA account, you may be permitted
to make withdrawals from your IRA account using checks furnished to you by
The Dreyfus Trust Company.
    
   
     Wire Redemption Privilege.  By using this Privilege, you authorize the
Transfer Agent to act on wire, telephone or letter redemption instructions
from any person representing himself or herself to be you 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 you on the Account Application or
Shareholder Services Form, or to a correspondent bank if your 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 your bank is necessary to avoid a delay in crediting the funds to
your bank account.
    
   
     If you have access to telegraphic equipment, you 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
   

     If you do not have direct access to telegraphic equipment, you may have
the wire transmitted by contacting a TRT Cables operator at 1-800-654-7171,
toll free.  You 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 and is a fundamental policy, as to a series, which may
not be changed without shareholder approval of such series.  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
   
    
   
     Fund Exchanges. You may purchase, in exchange for shares of the Fund,
shares of the Fund's other series or shares of certain other funds managed
or administered by the Manager, to the extent such shares are offered for
sale in your state of residence.  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, you must notify the
Transfer Agent of your prior ownership of fund shares and your account
number.
    
   
     To request an exchange, you 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 you check the applicable "No" box on the Account Application,
indicating that you specifically refuse this privilege. By using the
Telephone Exchange Privilege, you authorize 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 you,
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 you to purchase, in exchange for shares of the Fund, shares of
certain other funds in the Dreyfus Family of Funds of which you are a
shareholder.  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
you.  You will be notified if your account falls below the amount designated
to be exchanged under this Privilege.  In this case, your 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.
    
   
    
   
     Shareholder Services Forms and prospectuses of the other funds may be
obtained by calling 1-800-645-6561. Shares may be exchanged only between
accounts having identical names and other identifying designations.  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-Automatic Asset Builderr.  Dreyfus-Automatic Asset Builder
permits you to purchase Fund 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.
    
   
     Dreyfus Government Direct Deposit Privilege.  Dreyfus Government Direct
Deposit Privilege enables you to purchase Fund 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 U.S.
Government automatically deposited into your fund account.  You may deposit
as much of such payments as you elect.
    
   
     Dreyfus Payroll Savings Plan.  Dreyfus Payroll Savings Plan permits you
to purchase Fund 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 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.  It is
the sole responsibility of your employer, not the Distributor, the Manager,
the Fund, the Transfer Agent or any other person, to arrange for
transactions under the Dreyfus Payroll Savings Plan.
    
   
     Dreyfus Dividend Options.  Dreyfus Dividend Sweep allows you to invest
automatically your 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 you are 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.
   

     Dreyfus Dividend ACH permits you to transfer electronically dividends
or dividends and capital gain distributions, if any, from the Fund 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.
    
   
     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.
Withdrawal payments are the proceeds from sales of Fund shares, not the
yield on the shares.  If withdrawal payments exceed reinvested dividends and
distributions, your shares will be reduced and eventually may be depleted.
Automatic Withdrawal may be terminated at any time by you, the Fund or the
Transfer Agent.  Shares for which stock certificates have been issued may
not be redeemed through the Automatic Withdrawal Plan.
    
   
     Quarterly Distribution Plans.  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.
    

                           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 and may be
selected based upon their sales of shares of the Fund or other funds advised
by the Manager or its affiliates.
    

     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
   
    

     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
   

     Management believes that each series has qualified for the fiscal year
ended December 31, 1998 as a "regulated investment company" under the
Internal Revenue Code of 1986, as amended (the "Code").  Each series 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 tax to the extent its earnings are distributed in
accordance with applicable provisions of the Code.  If the series did not
qualify as a regulated investment company, it would be treated for tax
purposes as an ordinary corporation subject to Federal income tax.
    
   
     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 automatically are 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 will be 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.
    
   
     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 dividends or distributions 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.
    
   
     Ordinarily, gains and losses realized from portfolio transactions will
be treated as capital gain or loss.  However, all or a portion of any gain
realized from the sale or other disposition of certain market discount bonds
will be treated as ordinary income under Section 1276 of the Code.
    

                              YIELD INFORMATION
   
    
   
     For the seven-day period ended December 31, 1998, the Money Market
Series' yield was ___% and its effective yield was ___%.  For the seven-day
period ended December 31, 1998, the Government Securities Series' yield was
___% and its effective yield was ___%.  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.  You should remember that yield is a function of the type and
quality of the instruments in the portfolio, portfolio maturity and
operating expenses.  Your 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.
    
   
     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 ReportT, Bank Rate MonitorT, N.
Palm Beach, Fla. 33408, Morningstar, Inc. and other industry publications.
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 AND SERIES
    
   
    

     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.
   

     Unless otherwise required by the 1940 Act, ordinarily it will not be
necessary for the Fund to hold annual meetings of shareholders.  As a
result, shareholders may not consider each year the election of Board
members or the appointment of auditors.  However, the holders of at least
10% of the shares outstanding and entitled to vote may require the Fund to
hold a special meeting of shareholders for purposes of removing a Board
member from office.  Shareholders may remove a Board member by the
affirmative vote of two-thirds of the Fund's outstanding voting shares.  In
addition, the Board will call a meeting of shareholders for the purpose of
electing Board members if, at any time, less than a majority of the Board
members then holding office have been elected by shareholders.
    
   
     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 shareholders
of one portfolio is not deemed to be a shareholder of any other portfolio.
For certain matters shareholders vote together as a group; as to others they
vote separately by portfolio.
    
   
     To date, the Board has authorized the creation of two series of shares.
All consideration received by the Fund for shares of one of the series and
all assets in which such consideration is invested will 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 Fund has the ability to create, from time to time, new series
without shareholder approval.
    
   
     Under Massachusetts law, shareholders, under certain circumstances,
could be held personally liable for the obligations of the Fund.  However,
the Fund's 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.
   

       To offset the relatively higher costs of servicing smaller accounts,
the Fund will charge regular accounts with balances below $2,000 an annual
fee of $12.  The valuation of accounts and the deductions are expected to
take place during the last four months of each year.  The fee will be waived
for any investor whose aggregate Dreyfus mutual fund investments total at
least $25,000 and will apply to IRA accounts or to accounts participating in
automatic investment programs or opened through a securities dealer, bank or
other financial institution, or to other fiduciary accounts.
    

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


                      COUNSEL AND INDEPENDENT AUDITORS

     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 independent auditors of the
Fund.
    


                                  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 23.  Financial Statements and Exhibits. - List
_______   _____________________________________________________
    

          Exhibits:

 (a)      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.

 (b)  Registrant's By-Laws.

 (d)      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.

 (e)      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.

          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.

          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.

   
    

   

Item 23.  Exhibits. - List
_______   _____________________________________________________
    
   
          Other Exhibits
          ______________

                              (a)  Powers of Attorney.

                              (b)  Certificate of Secretary.
    
   
Item 24.  Persons Controlled by or under Common Control with Registrant.
_______   ______________________________________________________________

          Not Applicable
    
   
Item 25.    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 25.    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 26.       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.
    


<TABLE>
<CAPTION>
ITEM 26.  Business and Other Connections of Investment Adviser (continued)

          Officers and Directors of Investment Adviser
<S>                             <C>                                   <C>                      <C>
Name and Position
With Dreyfus                    Other Businesses                      Position Held            Dates

Christopher M. Condron          Mellon Preferred                      Director                 3/96 - 11/96
Chairman of the Board and       Capital Corporation*
Chief Executive Officer
                                TBCAM Holdings, Inc.*                 President                10/97 - 6/98
                                                                      Chairman                 10/97 - 6/98

                                The Boston Company                    Chairman                 1/98 - 6/98
                                Asset Management, LLC*                President                1/98 - 6/98

                                The Boston Company                    President                9/95 - 1/98
                                Asset Management, Inc.*               Chairman                 4/95 - 1/98
                                                                      Chief Executive Officer  4/95 - 4/97

                                Pareto Partners                       Partner Representative   11/95 - 5/97
                                271 Regent Street
                                London, England W1R 8PP

                                Franklin Portfolio Holdings, Inc.*    Director                 1/97 - Present

                                Franklin Portfolio
                                Associates Trust*                     Trustee                  9/95 - 1/97

                                Certus Asset Advisors Corp.**
                                                                      Director                 6/95 - Present

                                The Boston Company of                 Director                 6/95 - 4/96
                                Southern California                   Chief Executive Officer  6/95 - 4/96
                                Los Angeles, CA

                                Mellon Capital Management             Director                 5/95 - Present
                                Corporation***

                                Mellon Bond Associates, LLP+          Executive Committee      1/98 - Present
                                                                      Member


                                Mellon Bond Associates+               Trustee                  5/95 -1/98

                                Mellon Equity Associates, LLP+        Executive Committee      1/98 - Present
                                                                      Member

                                Mellon Equity Associates+             Trustee                  5/95 - 1/98

                                Boston Safe Advisors, Inc.*           Director                 5/95 - Present
                                                                      President                5/95 - Present

                                Access Capital Strategies Corp.       Director                 5/95 - 1/97
                                124 Mount Auburn Street
                                Suite 200 North
                                Cambridge, MA 02138

                                Mellon Bank, N.A. +                   Chief Operating Officer  3/98 - Present
                                                                      President                3/98 - Present
                                                                      Vice Chairman            11/94 - Present

Christopher M. Condron          Mellon Bank Corporation+              Chief Operating Officer  1/99 - Present
Chairman and Chief                                                    President                1/99 - Present
Executive                                                             Director                 1/98 - Present
Officer (Continued)                                                   Vice Chairman            11/94 - 1/99

                                The Boston Company Financial          Director                 4/94- 8/96
                                Services, Inc.*                       President                4/94 - 8/96

                                The Boston Company, Inc.*             Vice Chairman            1/94 - Present
                                                                      Director                 5/93 - Present

                                Laurel Capital Advisors, LLP+         Exec. Committee          1/98 - Present
                                                                      Member

                                Laurel Capital Advisors+              Trustee                  10/93 - 1/98

                                Boston Safe Deposit and Trust         Chairman                 3/93 - 2/96
                                Company of CA                         Chief Executive Officer  6/93 - 2/96
                                Los Angeles, CA                       Director                 6/89 - 2/96

                                MY, Inc.*                             President                9/91 - 3/96
                                                                      Director                 9/91 - 3/96

                                Reco, Inc.*                           President                8/91 - 11/96
                                                                      Director                 8/91 - 11/96

                                Boston Safe Deposit and Trust         Director                 6/89 - 2/96
                                Company of NY
                                New York, NY

                                Boston Safe Deposit and Trust         President                9/89 - 6/96
                                Company*                              Director                 5/93 -Present

                                The Boston Company Financial          President                6/89 - Present
                                Strategies, Inc. *                    Director                 6/89 - Present

                                The  Boston Company Financial         President                6/89 - 1/97
                                Strategies Group, Inc. *              Director                 6/89- 1/97

Mandell L. Berman               Self-Employed                         Real Estate Consultant,  11/74 - Present
Director                        29100 Northwestern Highway            Residential Builder and
                                Suite 370                             Private Investor
                                Southfield, MI 48034

Burton C. Borgelt               DeVlieg Bullard, Inc.                 Director                 1/93 - Present
Director                        1 Gorham Island
                                Westport, CT 06880

                                Mellon Bank Corporation+              Director                 6/91 - Present

                                Mellon Bank, N.A. +                   Director                 6/91 - Present

                                Dentsply International, Inc.          Director                 2/81 - Present
                                570 West College Avenue               Chief Executive Officer  2/81 - 12/96
                                York, PA                              Chairman                 3/89 - 1/96

Stephen E. Canter               Dreyfus Investment                    Chairman of the Board    1/97 - Present
President, Chief Operating      Advisors, Inc.++                      Director                 5/95 - Present
Officer, Chief Investment                                             President                5/95 - Present
Officer, and Director
                                Founders Asset Management, LLC        Acting Chief Executive   7/98 - 12/98
                                2930 East Third Ave.                  Officer
                                Denver, CO 80206

                                The Dreyfus Trust Company+++          Director                 6/95 - Present

Thomas F. Eggers                Dreyfus Service Corporation++         Executive Vice President 4/96 - Present
Vice Chairman - Institutional                                         Director                 9/96 - Present
and Director

Steven G. Elliott               Mellon Bank Corporation+              Senior Vice Chairman     1/99 - Present
Director                                                              Chief Financial Officer  1/90 - Present
                                                                      Vice Chairman            6/92 - 1/99
                                                                      Treasurer                1/90 - 5/98

                                Mellon Bank, N.A.+                    Senior Vice Chairman     3/98 - Present
                                                                      Vice Chairman            6/92 - 3/98
                                                                      Chief Financial Officer  1/90 - Present

                                Mellon EFT Services Corporation       Director                 10/98 - Present
                                Mellon Bank Center, 8th Floor
                                1735 Market Street
                                Philadelphia, PA 19103

                                Mellon Financial Services             Director                 1/96 - Present
                                Corporation #1                        Vice President           1/96 - Present
                                Mellon Bank Center, 8th Floor
                                1735 Market Street
                                Philadelphia, PA 19103

                                Boston Group Holdings, Inc.*          Vice President           5/93 - Present

                                APT Holdings Corporation              Treasurer                12/87 - Present
                                Pike Creek Operations Center
                                4500 New Linden Hill Road
                                Wilmington, DE 19808

                                Allomon Corporation                   Director                 12/87 - Present
                                Two Mellon Bank Center
                                Pittsburgh, PA 15259

                                Collection Services Corporation       Controller               10/90 - Present
                                500 Grant Street                      Director                 9/88 - Present
                                Pittsburgh, PA 15258                  Vice President           9/88 - Present
                                                                      Treasurer                9/88 - Present

                                Mellon Financial Company+             Principal Exec. Officer  1/88 - Present
                                                                      Chief Financial Officer  8/87 - Present
                                                                      Director                 8/87 - Present
                                                                      President                8/87 - Present

                                Mellon Overseas Investments           Director                 4/88 - Present
                                Corporation+                          Chairman                 7/89 - 11/97
                                                                      President                4/88 - 11/97
                                                                      Chief Executive Officer  4/88 - 11/97

                                Mellon International Investment       Director                 9/89 - 8/97
                                Corporation+

                                Mellon Financial Services             Treasurer                12/87 - Present
                                Corporation # 5+

Lawrence S. Kash                Dreyfus Investment                    Director                 4/97 - Present
Vice Chairman                   Advisors, Inc.++
And Director
                                Dreyfus Brokerage Services, Inc.      Chairman                 11/97 - Present
                                401 North Maple Ave.                  Chief Executive Officer  11/97 - Present
                                Beverly Hills, CA

                                Dreyfus Service Corporation++         Director                 1/95 - Present
                                                                      President                9/96 - Present

                                Dreyfus Precious Metals, Inc.++ +     Director                 3/96 - 12/98
                                                                      President                10/96 - 12/98

                                Dreyfus Service                       Director                 12/94 - Present
                                Organization, Inc.++                  President                1/97 - Present
                                                                      Executive Vice President 12/94 - 1/97

                                Seven Six Seven Agency, Inc. ++       Director                 1/97 - Present

                                Dreyfus Insurance Agency of           Chairman                 5/97 - Present
                                Massachusetts, Inc.++++               President                5/97 - Present
                                                                      Director                 5/97 - Present

                                The Dreyfus Trust Company+++          Chairman                 1/97 - Present
                                                                      President                2/97 - Present
                                                                      Chief Executive Officer  2/97 - Present
                                                                      Director                 12/94 - Present

                                The Dreyfus Consumer Credit           Chairman                 5/97 - Present
                                Corporation++                         President                5/97 - Present
                                                                      Director                 12/94 - Present

                                The Boston Company Advisors*          Chairman                 8/93 - 11/95

                                The Boston Company Advisors,          Chairman                 12/95 - Present
                                Inc.                                  Chief Executive Officer  12/95 - Present
                                Wilmington, DE                        President                12/95 - Present

                                Cornice Acquisition                   Board of Managers        12/97 - Present
                                Company, LLC
                                Denver, CO

                                The Boston Company, Inc.*             Director                 5/93 - Present
                                                                      President                5/93 - Present

                                Mellon Bank, N.A.+                    Executive Vice President 2/92 - Present

                                Laurel Capital Advisors, LLP+         President                12/91 - Present
                                                                      Executive Committee      12/91 - Present
                                                                      Member

                                Boston Group Holdings, Inc.*          Director                 5/93 - Present
                                                                      President                5/93 - Present

Martin G. McGuinn               Mellon Bank Corporation+              Chairman                 1/99 - Present
Director                                                              Chief Executive Officer  1/99 - Present
                                                                      Director                 1/98 - Present
                                                                      Vice Chairman            1/90 - 1/99

Martin G. McGuinn               Mellon Bank, N. A. +                  Chairman                 3/98 - Present
Director (Continued)                                                  Chief Executive Officer  3/98 - Present
                                                                      Director                 1/98 - Present
                                                                      Vice Chairman            1/90 - 1/99

                                Mellon Leasing Corporation+           Vice Chairman            12/96 - Present

                                Mellon Bank (DE) National             Director                 4/89 - 12/98
                                Association
                                Wilmington, DE

                                Mellon Bank (MD) National             Director                 1/96 - 4/98
                                Association
                                Rockville, Maryland

                                Mellon Financial                      Vice President           9/86  - 10/97
                                Corporation (MD)
                                Rockville, Maryland

J. David Officer                Dreyfus Service Corporation++         Executive Vice President 5/98 - Present
Vice Chairman
And Director                    Dreyfus Insurance Agency of           Director                 5/98 - Present
                                Massachusetts, Inc.++++

                                Seven Six Seven Agency, Inc.++        Director                 10/98 - Present

                                Mellon Residential Funding Corp. +    Director                 4/97 - Present

                                Mellon Trust of Florida, N.A.         Director                 8/97 - Present
                                2875 Northeast 191st Street
                                North Miami Beach, FL 33180

                                Mellon Bank, NA+                      Executive Vice President 7/96 - Present

                                The Boston Company, Inc.*             Vice Chairman            1/97 - Present
                                                                      Director                 7/96 - Present

                                Mellon Preferred Capital              Director                 11/96 - Present
                                Corporation*

                                RECO, Inc.*                           President                11/96 - Present
                                                                      Director                 11/96 - Present

                                The Boston Company Financial          President                8/96 - Present
                                Services, Inc.*                       Director                 8/96 - Present

                                Boston Safe Deposit and Trust         Director
                                Company*                              President                7/96 - Present
                                                                      Executive Vice President 7/96 - 1/99
                                                                                               1/91 - 7/96
                                Mellon Trust of New York              Director
                                1301 Avenue of the Americas                                    6/96 - Present
                                New York, NY 10019

                                Mellon Trust of California            Director                 6/96 - Present
                                400 South Hope Street
                                Suite 400
                                Los Angeles, CA 90071

J. David Officer                Mellon Bank, N.A.+                    Executive Vice President 2/94 - Present
Vice Chairman and
Director (Continued)            Mellon United National Bank           Director                 3/98 - Present
                                1399 SW 1st Ave., Suite 400
                                Miami, Florida

                                Boston Group Holdings, Inc.*          Director                 12/97 - Present

                                Dreyfus Financial Services Corp. +    Director                 9/96 - Present

                                Dreyfus Investment Services           Director                 4/96 - Present
                                Corporation+

Richard W. Sabo                 Founders Asset Management LLC         President                12/98 - Present
Director                        2930 East Third Avenue                Chief Executive Officer  12/98 - Present
                                Denver, CO. 80206

                                Prudential Securities                 Senior Vice President    07/91 - 11/98
                                New York, NY                          Regional Director        07/91 - 11/98

Richard F. Syron                American Stock Exchange               Chairman                 4/94 - Present
Director                        86 Trinity Place                      Chief Executive Officer  4/94 - Present
                                New York, NY 10006

Ronald P. O'Hanley              Franklin Portfolio Holdings, Inc.*    Director                 3/97 - Present
Vice Chairman
                                TBCAM Holdings, Inc.*                 Chairman                 6/98 - Present
                                                                      Director                 10/97 - Present

                                The Boston Company Asset              Chairman                 6/98 - Present
                                Management, LLC*                      Director                 1/98 - 6/98

                                The Boston Company Asset              Director                 2/97 - 12/97
                                Management, Inc. *

                                Boston Safe Advisors, Inc. *          Chairman                 6/97 - Present
                                                                      Director                 2/97 - Present

                                Pareto Partners                       Partner Representative   5/97 - Present
                                271 Regent Street
                                London, England W1R 8PP

                                Mellon Capital Management             Director                 5/97 -Present
                                Corporation***

                                Certus Asset Advisors Corp.**         Director                 2/97 - Present

                                Mellon Bond Associates+               Trustee                  2/97 - Present
                                                                      Chairman                 2/97 - Present

                                Mellon Equity Associates+             Trustee                  2/97 - Present
                                                                      Chairman                 2/97 - Present

                                Mellon-France Corporation+            Director                 3/97 - Present

                                Laurel Capital Advisors+              Trustee                  3/97 - Present

Ronald P. O'Hanley              McKinsey & Company, Inc.              Partner                  8/86 - 2/97
Vice Chairman (Continued)       Boston, MA

Mark N. Jacobs                  Dreyfus Investment                    Director                 4/97 -Present
General Counsel,                Advisors, Inc.++                      Secretary                10/77 - 7/98
Vice President, and
Secretary                       The Dreyfus Trust Company+++          Director                 3/96 - Present

                                The TruePenny Corporation++           President                10/98 - Present
                                                                      Director                 3/96 - Present

                                Lion Management, Inc.++               Director                 1/88 - 10/96
                                                                      Vice President           1/88 - 10/96
                                                                      Secretary                1/88 - 10/96

                                The Dreyfus Consumer Credit           Secretary                4/83 - 3/96
                                Corporation++

                                Dreyfus Service                       Director                 3/97 - Present
                                Organization, Inc.++                  Assistant Secretary      4/83 -3/96

                                Major Trading Corporation++           Assistant Secretary      5/81 - 8/96

William H. Maresca              The Dreyfus Trust Company+++          Director                 3/97 - Present
Controller
                                Dreyfus Service Corporation++         Chief Financial Officer  12/98 - Present

                                Dreyfus Consumer Credit Corp.++       Treasurer                10/98 - Present

                                Dreyfus Investment                    Treasurer                10/98 - Present
                                Advisors, Inc. ++

                                Dreyfus-Lincoln, Inc.                 Vice President           10/98 - Present
                                4500 New Linden Hill Road
                                Wilmington, DE 19808

                                The TruePenny Corporation++           Vice President           10/98 - Present

                                Dreyfus Precious Metals, Inc.+++      Treasurer                10/98 - 12/98

                                The Trotwood Corporation++            Vice President           10/98 - Present

                                Trotwood Hunters Corporation++        Vice President           10/98 - Present

                                Trotwood Hunters Site A Corp. ++      Vice President           10/98 - Present

                                Dreyfus Transfer, Inc.                Chief Financial Officer  5/98 - Present
                                One American Express Plaza,
                                Providence, RI 02903

                                Dreyfus Service                       Assistant  Treasurer     3/93 - Present
                                Organization, Inc.++

                                Dreyfus Insurance Agency of           Assistant Treasurer      5/98 - Present
                                Massachusetts, Inc.++++

William T. Sandalls, Jr.        Dreyfus Transfer, Inc.                Chairman                 2/97 - Present
Executive Vice President        One American Express Plaza,
                                Providence, RI 02903

William T. Sandalls, Jr.        Dreyfus Service Corporation++         Director                 1/96 - Present
Executive Vice President                                              Treasurer                1/96 - 2/97
(Continued)                                                           Executive Vice President 2/97 - Present
                                                                      Chief Financial Officer  2/97 - 12/98

                                Dreyfus Investment                    Director                 1/96 - Present
                                Advisors, Inc.++                      Treasurer                1/96 - 10/98

                                Dreyfus-Lincoln, Inc.                 Director                 12/96 - Present
                                4500 New Linden Hill Road             President                1/97 - Present
                                Wilmington, DE 19808

                                Dreyfus Acquisition Corporation++     Director VP and CFO      1/96 - 8/96
                                                                      Vice President           1/96 - 8/96
                                                                      Chief Financial Officer  1/96 - 8/96

                                Lion Management, Inc.++               Director                 1/96 - 10/96
                                                                      President                1/96 - 10/96

                                Seven Six Seven Agency, Inc.++        Director                 1/96 - 10/98
                                                                      Treasurer                10/96 - 10/98

                                The Dreyfus Consumer                  Director                 1/96 - Present
                                Credit Corp.++                        Vice President           1/96 - Present
                                                                      Treasurer                1/97 - 10/98

                                Dreyfus Partnership                   President                1/97 - 6/97
                                Management, Inc.++                    Director                 1/96 - 6/97

                                Dreyfus Service Organization,         Director                 1/96 - 6/97
                                Inc.++                                Executive Vice President 1/96 - 6/97
                                                                      Treasurer                10/96 - Present

                                Dreyfus Insurance Agency of           Director                 5/97 - Present
                                Massachusetts, Inc.++++               Treasurer                5/97 - Present
                                                                      Executive Vice President 5/97 - Present

                                Major Trading Corporation++           Director                 1/96 - 8/96
                                                                      Treasurer                1/96 - 8/96

                                The Dreyfus Trust Company+++          Director                 1/96 - 4/97
                                                                      Treasurer                1/96 - 4/97
                                                                      Chief Financial Officer  1/96 - 4/97

                                Dreyfus Personal                      Director                 1/96 - 4/97
                                Management, Inc.++                    Treasurer                1/96 - 4/97


Patrice M. Kozlowski            None
Vice President - Corporate
Communications

Mary Beth Leibig                None
Vice President -
Human Resources

Andrew S. Wasser                Mellon Bank Corporation+              Vice President           1/95 - Present
Vice President -
Information Systems

Theodore A. Schachar            Dreyfus Service Corporation++         Vice President -Tax      10/96 - Present
Vice President - Tax
                                Dreyfus Investment Advisors, Inc.++   Vice President - Tax     10/96 - Present

                                Dreyfus Precious Metals, Inc. +++     Vice President - Tax     10/96 - 12/98

                                Dreyfus Service Organization, Inc.++  Vice President - Tax     10/96 - Present

Wendy Strutt                    None
Vice President

Richard Terres                  None
Vice President

James Bitetto                   The TruePenny Corporation++           Secretary                9/98 - Present
Assistant Secretary
                                Dreyfus Service Corporation++         Assistant Secretary      8/98 - Present

                                Dreyfus Investment                    Assistant Secretary      7/98 - Present
                                Advisors, Inc.++

                                Dreyfus Service                       Assistant Secretary      7/98 - Present
                                Organization, Inc.++

Steven F. Newman                Dreyfus Transfer, Inc.                Vice President           2/97 - Present
Assistant Secretary             One American Express Plaza            Director                 2/97 - Present
                                Providence, RI 02903                  Secretary                2/97 - Present

                                Dreyfus Service                       Secretary                7/98 - Present
                                Organization, Inc.++                  Assistant Secretary      5/98 - 7/98


_______________________________
*   The address of the business so indicated is One Boston Place, Boston,
    Massachusetts, 02108.
**  The address of the business so indicated is One Bush Street, Suite 450, San
    Francisco, California 94104.
*** The address of the business so indicated is 595 Market Street, Suite 3000,
    San Francisco, California 94105.
+   The address of the business so indicated is One Mellon Bank Center,
    Pittsburgh, Pennsylvania 15258.
++  The address of the business so indicated is 200 Park Avenue, New York, New
    York 10166.
+++ 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 53 State Street, Boston,
    Massachusetts 02109

</TABLE>

Item 27.  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 Debt and Equity 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)    Dreyfus Investment Portfolios
     37)    The Dreyfus/Laurel Funds, Inc.
     38)    The Dreyfus/Laurel Funds Trust
     39)    The Dreyfus/Laurel Tax-Free Municipal Funds
     40)    Dreyfus LifeTime Portfolios, Inc.
     41)    Dreyfus Liquid Assets, Inc.
     42)    Dreyfus Massachusetts Intermediate Municipal Bond Fund
     43)    Dreyfus Massachusetts Municipal Money Market Fund
     44)    Dreyfus Massachusetts Tax Exempt Bond Fund
     45)    Dreyfus MidCap Index Fund
     46)    Dreyfus Money Market Instruments, Inc.
     47)    Dreyfus Municipal Bond Fund, Inc.
     48)    Dreyfus Municipal Cash Management Plus
     49)    Dreyfus Municipal Money Market Fund, Inc.
     50)    Dreyfus New Jersey Intermediate Municipal Bond Fund
     51)    Dreyfus New Jersey Municipal Bond Fund, Inc.
     52)    Dreyfus New Jersey Municipal Money Market Fund, Inc.
     53)    Dreyfus New Leaders Fund, Inc.
     54)    Dreyfus New York Insured Tax Exempt Bond Fund
     55)    Dreyfus New York Municipal Cash Management
     56)    Dreyfus New York Tax Exempt Bond Fund, Inc.
     57)    Dreyfus New York Tax Exempt Intermediate Bond Fund
     58)    Dreyfus New York Tax Exempt Money Market Fund
     59)    Dreyfus U.S. Treasury Intermediate Term Fund
     60)    Dreyfus U.S. Treasury Long Term Fund
     61)    Dreyfus 100% U.S. Treasury Money Market Fund
     62)    Dreyfus U.S. Treasury Short Term Fund
     63)    Dreyfus Pennsylvania Intermediate Municipal Bond Fund
     64)    Dreyfus Pennsylvania Municipal Money Market Fund
     65)    Dreyfus Premier California Municipal Bond Fund
     66)    Dreyfus Premier Equity Funds, Inc.
     67)    Dreyfus Premier International Funds, Inc.
     68)    Dreyfus Premier GNMA Fund
     69)    Dreyfus Premier Worldwide Growth Fund, Inc.
     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)    Founders Funds, Inc.
     85)    General California Municipal Bond Fund, Inc.
     86)    General California Municipal Money Market Fund
     87)    General Government Securities Money Market Fund, Inc.
     88)    General Money Market Fund, Inc.
     89)    General Municipal Bond Fund, Inc.
     90)    General Municipal Money Market Funds, Inc.
     91)    General New York Municipal Bond Fund, Inc.
     92)    General New York Municipal Money Market Fund


   

Item 28.   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 29.   Management Services
_______    ___________________

           Not Applicable
    
   
Item 30.   Undertakings
________   ____________
    


                                 SIGNATURES
   

     Pursuant to the requirements of the Securities Act of 1933 and the
Investment Company Act of 1940 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 24 day of February, 1999.
    

                    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           02/24/99
Marie E. Connolly               (Principal Executive, Financial
                                and Accounting Officer)
    
   
/s/Joseph S. DiMartino*         Chairman of the Board of          02/24/99
Joseph S. DiMartino,            Trustees
    
   
/s/David P. Feldman*            Trustee                           02/24/99
David P. Feldman
    
   
/s/John M. Fraser, Jr.*         Trustee                           02/24/99
John M. Fraser, Jr.
    
   
/s/Robert R. Glauber*           Trustee                           02/24/99
Robert R. Glauber
    
   
/s/James F. Henry*              Trustee                           02/24/99
James F. Henry
    
   
/s/Rosalind G. Jacobs*          Trustee                           02/24/99
Rosalind G. Jacobs
    
   
/s/Irving Kristol*              Trustee                           02/24/99
Irving Kristol
    
   
/s/Paul A. Marks*               Trustee                           02/24/99
Paul A. Marks
    
   
/s/Dr. Martin Peretz*           Trustee                           02/24/99
Dr. Martin Peretz
    
   
/s/Bert W. Wasserman*           Trustee                           02/24/99
Bert W. Wasserman
    



*BY:     _____________________________________
         Michael S. Petrucelli
         Attorney-in-Fact


                       INDEX OF EXHIBITS


EXHIBITS

        (a)       Powers of Attorney

        (b)       Certificate of Secretary









                       POWER OF ATTORNEY


     The undersigned hereby constitute and appoint, Margaret W. Chambers,
Marie E. Connolly, Christopher J. Kelley, Kathleen K. Morrisey, Michael S.
Petrucelli, Stephanie Pierce 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 Growth Opportunity Fund, Inc. (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                     June 8, 1998
Joseph S. DiMartino

 /s/ David P. Feldman                        June 8, 1998
David P. Feldman

 /s/ John M. Fraser, Jr.                     June 8, 1998
John M. Fraser, Jr.

 /s/ Robert R. Glauber                       June 8, 1998
Robert R. Glauber

 /s/ James F. Henry                          June 8, 1998
James F. Henry

 /s/ Rosalind Gersten Jacobs                 June 8, 1998
Rosalind Gersten Jacobs

 /s/ Irving Kristol                          June 8, 1998
Irving Kristol

 /s/ Paul A. Marks                           June 8, 1998
Paul A. Marks

 /s/ Martin Peretz                           June 8, 1998
Martin Peretz

 /s/ Bert W. Wasserman                       June 8, 1998
Bert W. Wasserman



                       POWER OF ATTORNEY


     The undersigned hereby constitute and appoint, Margaret W. Chambers,
Christopher J. Kelley, Kathleen K. Morrisey, Michael S. Petrucelli,
Stephanie Pierce 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 Growth Opportunity Fund, Inc. (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/ Marie E. Connolly                            June 8, 1998
Marie E. Connolly







               ASSISTANT SECRETARY'S CERTIFICATE

     I, Michael S. Petrucelli, Assistant Secretary of Dreyfus Institutional
Money Market Fund. (the "Fund," hereby certify the following resolution was
adopted at a Board Meeting held on June 8, 1998 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  Margaret W. Chambers, Marie
E. Connolly, Christopher J. Kelley, Kathleen K. Morrisey, Michael S.
Petrucellli, Stephanie Pierce and Elba Vasquez, as the attorney-in-fact for
the proper officers of the Fund, with full power of substitution and re-
substitution; 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       day of February, 1999.


                                        ___________________________
                                            Michael S. Petrucelli



(SEAL)
DREYFUS INSTITUTIONAL MONEY MARKET FUND






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