NORTHERN INSTITUTIONAL FUNDS
497, 1999-11-01
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Northern Institutional Funds

SMALL COMPANY GROWTH PORTFOLIO

                                OCTOBER 20, 1999




<PAGE>






Northern Institutional Funds

                         SMALL COMPANY GROWTH PORTFOLIO







Prospectus dated October 20, 1999

Northern  Institutional  Funds (the  "Trust")  offers a selection of  investment
portfolios to institutional investors, each with a distinct investment objective
and risk/reward profile.

This Prospectus  describes the Small Company Growth  Portfolio.  Descriptions of
the six fixed income,  five money market, one balanced and six equity portfolios
(the  "Portfolios")  that  make up the  remainder  of the  Portfolios  currently
offered by the Trust are included in separate  prospectuses.  The Small  Company
Growth  Portfolio  (as  well  as  the  other  non-money  market  Portfolios)  is
authorized  to offer  three  classes  of  shares:  Class A,  Class C and Class D
Shares.

An  investment  in the Portfolio is not a deposit of any bank and is not insured
or  guaranteed  by the  Federal  Deposit  Insurance  Corporation  or  any  other
government  agency.  An investment in the Portfolio  involves  investment risks,
including possible loss of principal.

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>


Contents

<TABLE>
<CAPTION>
<S><C>                                       <C>                                                           <C>
RISK/RETURN SUMMARY  SMALL COMPANY GROWTH PORTFOLIO                                                         5

Information about the
objective, principal strategies              Principal Investment Strategies and Risks                      5
and risk characteristics
of the Portfolio                             Portfolio Performance                                          7


                                             Portfolio Fees and Expenses                                    8
- ----------------------------------------------------------------------------------------------------------------------------
MANAGEMENT                                   Investment Adviser                                             10
OF THE
PORTFOLIO                                    Advisory Fees                                                  10

                                             Portfolio Management                                           10

                                             Other Portfolio Management Information                         10

                                             Other Portfolio Services                                       10
- --------------------------------------------------------------------------------------------------------
ABOUT YOUR                                   Purchasing and Selling Shares                                  11
ACCOUNT
                                                  Purchasing Shares                                         11
How to open, maintain
and close an account                              Opening an Account                                        11

                                                  Selling Shares                                            13

                                            Account Policies and Other Information                          14

                                                  Purchase and Redemption Minimums                          14

                                                  Calculating Share Price                                   14

                                                  Timing of Purchase Requests                               14

                                                  Tax Identification Number                                 14

                                                  In-Kind Purchases and Redemptions                         15

                                                  Miscellaneous Purchase Information                        15

                                                  Timing of Redemption and Exchange Requests                15

                                                  Miscellaneous Redemption Information                      15

                                                  Exchange Privileges                                       16

                                                  Telephone Transactions                                    16

                                                  Making Changes to Your Account Information                16

                                                  Business Day                                              16

                                                  Early Closings                                            16

                                                  Authorized Intermediaries                                 16

                                                  Servicing Agents                                          17

                                             Dividends and Distributions                                    17

                                             Tax Considerations                                             18

                                             Year 2000 Issues                                               19
- ----------------------------------------------------------------------------------------------------------------------------
RISKS, SECURITIES AND TECHNIQUES             Additional Information on Principal Investment Strategies and Related Risks  20

                                             Additional Description of Securities and Common Investment Techniques        21

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


<PAGE>


FOR MORE INFORMATION                         Annual/Semiannual Report                                       31
- ------------------------------------------------------------------------------------------------------------------------------------

- ------------------------------------------------------------------------------------------------------------------------------------
                                             Statement of Additional Information                            31
- ------------------------------------------------------------------------------------------------------------------------------------

- ------------------------------------------------------------------------------------------------------------------------------------
</TABLE>



<PAGE>


SMALL COMPANY GROWTH PORTFOLIO

INVESTMENT OBJECTIVE

The  Portfolio  seeks to  provide  long-term  capital  appreciation.  Any income
received is incidental to this objective.  The Portfolio's  investment objective
may be changed without shareholder approval.

PRINCIPAL INVESTMENT STRATEGIES AND RISKS

Investment Strategies. In seeking long-term capital appreciation,  the Portfolio
will invest, under normal market conditions, at least 65% of its total assets in
the equity securities of companies with market  capitalizations that are, at the
time of  purchase,  within  the range of the  Russell  2000  Small  Stock  Index
("Russell 2000 Index").

Using fundamental research and quantitative  analysis, the investment management
team selects stocks of small companies that it believes have demonstrated  above
average sales and earnings  growth and return on equity relative to their peers.
In  doing  so,  the  investment  management  team  considers  factors  such as a
company's:

 Financial condition (such as debt to equity ratio);

 Market share and product leadership;

 Earnings growth relative to relevant competitors;

 Market valuation in comparison to securities of other small cap companies and
  the stock's own historical norms; and

 Price trends.

As of September 30, 1999, the  approximate  market  capitalization  range of the
companies  included in the Russell  2000 Index was between $330 million and $3.4
billion.  However,  the  Portfolio is not limited to the stocks  included in the
Russell  2000  index and may  invest in other  stocks  that meet the  Investment
Adviser's criteria discussed above.

Although the Portfolio primarily invests in the stocks of U.S. companies, it
may invest to a limited extent in the securities of foreign issuers.

Russell  does not  endorse  any stock in the  Index.  It is not a sponsor of the
Small Company Growth  Portfolio and is not affiliated  with the Portfolio in any
way.

Risks.  These  primary  investment  risks apply to the  Portfolio:  market risk,
management risk,  liquidity risk, Year 2000 risk, stock risk, small company risk
and portfolio turnover risk. These and other risks are summarized below.

In addition to the instruments  described on the pages below,  the Small Company
Growth Portfolio may use various investment techniques in seeking its investment
objective.  You can learn more about these techniques and their related risks by
reading "Risks, Securities and Techniques" on page 20 of this Prospectus and the
Statement of Additional Information.

Please  keep in mind  that  the  Portfolio  cannot  guarantee  it will  meet its
investment  objective,  and that the  Portfolio  should not be relied  upon as a
complete investment program.

PRINCIPAL INVESTMENT RISKS

All  investments  carry some  degree of risk which will  affect the value of the
Portfolio's investments, its investment performance and the price of its shares.
As a result, loss of money is a risk of investing in the Portfolio.

An  investment  in the Portfolio is not a deposit of any bank and is not insured
or  guaranteed  by the  Federal  Deposit  Insurance  Corporation  or  any  other
government agency.

The following summarizes the principal risks that apply to the Portfolio and may
result in a loss of your investment.

o          MARKET RISK is the risk that the value of the securities in which the
           Portfolio  invests may go up or down in response to the  prospects of
           individual  companies  and/or  general  economic  conditions.   Price
           changes may be temporary or last for extended periods.

o          MANAGEMENT  RISK is the risk that a strategy  used by the  investment
           management team may fail to produce the intended results.

o          LIQUIDITY RISK is the risk that the Portfolio will not be able to pay
           redemption  proceeds  within  the  time  periods  described  in  this
           Prospectus  because of unusual market  conditions,  an unusually high
           volume of redemption requests or other reasons.

o          YEAR 2000 RISK is the risk that the  Portfolio's  operations or value
           will be adversely  affected by the "Year 2000 Problem." This risk may
           be  of  greater   significance   with  respect  to  the   Portfolio's
           investments  in  the  securities  of  foreign   issuers.   (For  more
           information, please see "Year 2000 Issues" on page 19.)

o          STOCK RISK is the risk that stock prices have historically  risen and
           fallen in periodic cycles.  As of the date of this  Prospectus,  U.S.
           stock  markets and certain  foreign  stock markets were trading at or
           close to record high levels.  There is no guarantee  that such levels
           will continue.

     o    SMALL COMPANY STOCK RISK is the risk that stocks of smaller  companies
          may be subject to more abrupt or erratic market  movements than stocks
          of  larger,  more  established  companies.  Small  companies  may have
          limited product lines or financial resources, or may be dependent upon
          a small or inexperienced  management group. In addition, small company
          stocks  typically  are  traded  in lower  volume,  and  their  issuers
          typically are subject to greater  degrees of changes in their earnings
          and prospects.

          PORTFOLIO  TURNOVER  RISK is the  risk  that  the  Portfolio's  annual
               portfolio  turnover  rate (which is not  expected to exceed 200%)
               may result in increased  Portfolio expenses and higher short-term
               capital gains taxable to shareholders.

More  information  about the risks of investing in the  Portfolio is provided in
"Risks,  Securities and Techniques"  beginning on page 20. You should  carefully
consider  the  risks  discussed  in  these  sections  before  investing  in  the
Portfolio.

PORTFOLIO PERFORMANCE

The bar  charts  and the  performance  tables  have  been  omitted  because  the
Portfolio has been in operation for less than one calendar year.


<PAGE>


PORTFOLIO FEES AND EXPENSES

This table  describes the fees and expenses that you may pay if you buy and hold
Class A, C or D Shares of the  Portfolio.  Each class of shares  represents  pro
rata interests in the Portfolio except that different  shareholder servicing and
transfer  agency fees are payable  due to the varying  levels of  administrative
support and transfer agency services provided to each class.

Please note that the  following  information  does not reflect any charges which
may be imposed by The Northern  Trust  Company,  its  affiliates,  correspondent
banks and other institutions on their customers.  (For more information,  please
see "Account Policies and Other Information" on page 14.)

<TABLE>
<CAPTION>
<S><C>                                                                  <C>           <C>             <C>
                                                                        Class A       Class C         Class D
                  SMALL COMPANY GROWTH PORTFOLIO                        Shares        Shares          Shares

Shareholder Fees (fees paid directly from your investment)

 Sales Charge (Load) Imposed on Purchases                               None          None            None

    Additional Transaction Fee (as a percentage of amount               None          None            None
invested)

    Deferred Sales Charge (Load)                                        None          None            None

    Sales Charge (Load) Imposed on Reinvested Distributions             None          None            None

    Redemption Fees                                                     None          None            None

    Exchange Fees                                                       None          None            None


                                                                       Class A        Class C         Class D
                                                                       Shares         Shares          Shares

Annual Portfolio Operating Expenses
(expenses that are deducted from Portfolio Assets)1

    Management Fees2                                                   1.10%          1.10%           1.10%

    Distribution (12b-1) Fees                                          None           None            None

    Servicing Fees                                                     None           0.15%           0.25%

    Transfer Agency Fees                                               0.01%          0.10%           0.15%

    Other Operating Expenses3                                          0.18%          0.18%           0.18%

    Total Other Operating Expenses                                     0.19%          0.43%           0.58%

    Total Annual Portfolio Operating Expenses4                         1.29%          1.53%           1.68%

</TABLE>

1        The Portfolio's annual operating expenses are based on actual
         fees and estimated expenses for the current fiscal year.

2        As  of  the  date  of  this  Prospectus,  the  Northern  Trust  Company
         ("Northern") is voluntarily waiving a portion of its management fee for
         the Portfolio. As a result of the fee waiver, actual management fees to
         be paid by the Portfolio are 0.80% of the Portfolio's average daily net
         assets.  Fee  waivers  may be  terminated  at any time at the option of
         Northern.

3        "Other Expenses" include  co-administration fees and all other ordinary
         operating  expenses of the  Portfolio  not listed  above.  Northern and
         First Data Investor Services Group, Inc. ("First Data Investor Services
         Group") as  co-administrators  are entitled to a co-administration  fee
         from the  Portfolio  at an  annual  rate of  0.10%  of the  Portfolio's
         average daily net assets.  Under the  Co-Administration  Agreement with
         the  Trust,  which may be amended  without  shareholder  approval,  the
         co-administrators   have  agreed  indefinitely  to  reimburse  expenses
         (including  fees payable to Northern and First Data  Investor  Services
         Group as  co-administrators,  but excluding  management fees,  transfer
         agency fees, servicing fees and extraordinary expenses) which exceed on
         an annualized basis 0.10% of the Portfolio's  average daily net assets.
         As a result of the expense  reimbursement,  estimated  "Other Expenses"
         are currently 0.10% of the Portfolio's average daily net assets.

4        As a  result  of  the  fee  waivers  and  expense  reimbursements,  the
         estimated  actual  management  fees,  distribution  (12b-1) fees, other
         expenses and total annual operating  expenses for the Portfolio for the
         current  fiscal year are set forth below.  Fee waivers  (and  voluntary
         expense reimbursements, if applicable) may be terminated at any time at
         the option of Northern.  If this occurs, "Other Operating Expenses" may
         increase without shareholder approval.
<TABLE>
<CAPTION>
<S>     <C>            <C>                   <C>                    <C>                       <C>

                                                                                               Total Annual
                       Management            Distribution                                      Operating Expenses
                       Fees                  (12b-1) Fees            Other Expenses

         Class A       0.80%                 0.00%                   0.11%                     0.91%
         Class C       0.80%                 0.00%                   0.35%                     1.15%
         Class D       0.80%                 0.00%                   0.50%                     1.30%
</TABLE>



EXAMPLE

The  following  Example is intended to help you compare the cost of investing in
the Portfolio (without fee waivers and expense  reimbursements) with the cost of
investing in other mutual funds.

The  Example  assumes  that you  invest  $10,000 in the  Portfolio  for the time
periods  indicated (with  reinvestment of all dividends and  distributions)  and
then redeem all of your  shares at the end of those  periods.  The Example  also
assumes that your  investment has a 5% return each year and that the Portfolio's
operating expenses remain the same.  Although your actual costs may be higher or
lower, based on these assumptions your costs would be:
<TABLE>
<CAPTION>
<S><C>                                           <C>                        <C>

                                                  1 Year                    3 Years
                                                  ------                    -------

Class A                                            $131                       $409

Class C                                            $156                       $483

Class D                                            $171                       $530

</TABLE>

<PAGE>


MANAGEMENT OF THE PORTFOLIO

Investment Adviser

The Northern Trust Company  ("Northern"),  an Illinois  state-chartered bank and
member of the  Federal  Reserve  System,  serves as  investment  adviser for the
Portfolio.

Northern is referred to as the "Investment  Adviser." The Investment Adviser, is
located  at 50 S.  LaSalle  Street,  Chicago,  IL 60675  and is a  wholly  owned
subsidiary  of  Northern  Trust  Corporation,  a  bank  holding  company.  As of
September  30,  1999,  Northern  Trust  Corporation  and  its  subsidiaries  had
approximately  $33.7  billion in assets,  $19.1 billion in deposits and employed
over 8,360 persons.

Northern and its affiliates  administered  in various  capacities  (including as
master trustee, investment manager or custodian) approximately $1.38 trillion of
assets as of  September  30, 1999,  including  approximately  $262.8  billion of
assets  for  which  Northern  and  its  affiliates  had  investment   management
responsibility.

Under its Advisory  Agreement with the Trust, the Investment  Adviser subject to
the general  supervision of the Trust's Board of Trustees,  is  responsible  for
making investment  decisions for the Portfolio and for placing purchase and sale
orders for portfolio securities.

Advisory Fees

As  compensation  for its  advisory  services  and  its  assumption  of  related
expenses,  the Investment Adviser is entitled to an advisory fee, computed daily
and payable  monthly,  at an annual  contractual  rate of 1.10%  (expressed as a
percentage of the Portfolio's average daily net assets).

The difference,  if any,  between this  contractual  advisory fee and the actual
advisory fee that is paid by the  Portfolio  will  reflect  that the  Investment
Adviser  did not  charge  the full  amount of the  advisory  fee to which it was
entitled.  The  Investment  Adviser  may  discontinue  or modify  its  voluntary
limitation in the future at its discretion.

Portfolio Management

The Investment  Adviser employs a team approach to the investment  management of
the Portfolio,  relying upon  investment  professionals  under the leadership of
James M.  Snyder,  Chief  Investment  Officer and  Executive  Vice  President of
Northern.

The management team leader for the Small Company Growth  Portfolio will be David
H.  Burshtan,  Vice  President of Northern,  when it  commences  operation.  Mr.
Burshtan  joined  Northern  in 1999.  From  1995 to  1999,  Mr.  Burshtan  was a
portfolio  manager  for  various  small cap  mutual  funds with  Scudder  Kemper
Investments,  Inc. From 1993 to 1995, Mr. Burshtan held a variety of analyst and
portfolio management positions with Northern.

Other Portfolio Services

Northern also serves as transfer agent ("Transfer  Agent") and custodian for the
Portfolio. As Transfer Agent, Northern performs various administrative servicing
functions, and any shareholder inquiries should be directed to it. The fees that
Northern  receives for its services in those  capacities are described on page 8
under  "Portfolio  Fees  and  Expenses"  and  in  the  Statement  of  Additional
Information.  Northern and First Data Investor Services Group, Inc. ("First Data
Investor Services"), a wholly-owned subsidiary of First Data Corporation,  serve
as  co-administrators  for the Portfolio.  The fees that Northern and First Data
Investor  Services  receive for their services in these capacities are described
on page 8 under "Portfolio Fees and Expenses."

                               ABOUT YOUR ACCOUNT

Purchasing and Selling Shares

PURCHASING SHARES

Institutional  investors,  acting  on their  own  behalf  or on  behalf of their
customers,  clients,  employees,  participants  and  others  ("Customers"),  may
purchase  shares  of the  Portfolio  through  their  institutional  accounts  at
Northern or an affiliate. They may also purchase shares directly from the Trust.
There is no sales charge imposed on purchases of shares. Institutional investors
include:

      Northern and its affiliates;
      Defined contribution plans having at least $30 million in assets or annual
      contributions  of  at  least  $5  million;   and  Other  institutions  and
      organizations.

The Portfolio  currently  offers a choice of three classes of shares to meet the
special needs of institutional investors ("Institutions").

Class A Shares are designed for Institutions  that can obtain  information about
their shareholder  accounts and do not require the additional services available
to other classes.

Class C Shares are designed for Institutions that require the Transfer Agent and
a  Servicing  Agent to provide  certain  account-related  services  incident  to
Customers being the beneficial owners of shares.

Class D Shares are designed for Institutions that require the Transfer Agent and
a  Servicing   Agent  to  provide   them  and  their   Customers   with  certain
account-related services and other information.

Shares of each class bear their pro rata portion of all operating  expenses paid
by  the  Portfolio,   except   amounts   payable  to   Institutions   for  their
account-related  and support  services  and transfer  agency fees.  Institutions
receive fees from the  Portfolio  for their  services at an annual rate of up to
0.15% and  0.25% of the  average  daily  net asset  value of Class C and Class D
Shares, respectively.  Because of these class-specific expenses, the performance
of Class A Shares of the Portfolio is expected to be higher than the performance
of both Class C and Class D Shares of the Portfolio,  and the performance of the
Portfolio's  Class C Shares is  expected to be higher  than the  performance  of
Class D Shares.

OPENING AN ACCOUNT

You may purchase shares of the Portfolio through your  institutional  account at
Northern (or an  affiliate)  or you may open an account  directly with the Trust
with a minimum initial investment of $5 million in the Portfolio and one or more
other  investment  Portfolios of the Trust.  There is no minimum for  subsequent
investments.

Through an Institutional Account. If you are opening an institutional account at
Northern,  a  Northern  representative  can  assist  you with all phases of your
investment.  To purchase  shares  through your  account,  contact your  Northern
representative for further information.

Directly  from the Trust.  An  Institution  may open a  shareholder  account and
purchase shares directly from the Trust as described in this Prospectus.
- --------------------------------------------------------------------------------
By Mail

Read this Prospectus carefully.

Complete and sign the new account application.

Include a  certified  corporate  resolution  (or other  acceptable  evidence  of
authority).

Enclose a check or Federal Reserve draft payable to the Portfolio.

Mail your check, corporate resolution and completed application to:

        Northern Institutional Funds
        c/o The Northern Trust Company
        P.O. Box 75943
        Chicago, Illinois 60675-5943

All checks must be payable in U.S.  dollars  and drawn on a bank  located in the
United   States.   Cash   and   third   party   checks   are   not   acceptable.
- --------------------------------------------------------------------------------

By Telephone

Read this Prospectus carefully.

Call the Transfer Agent at 1-800-637-1380.

To open a new account please provide:

      The name of the Portfolio
      The number of shares or dollar amount to be invested
      The method of payment

To add to an existing account, please provide:

      The Institution's name
      Your Account Number
- --------------------------------------------------------------------------------

By Wire or Automated Clearing House Transfer ("ACH Transfer")

To open a new account:

Call the Transfer Agent at 1-800-637-1380 for instructions.

For more  information  about the purchase of shares,  call the Transfer Agent at
1-800-637-1380.



<PAGE>


To add to an existing account:

Have your bank wire Federal funds or effect an ACH Transfer to:

        The Northern Trust Company
        Chicago, Illinois
        ABA Routing No. 0710-00152
        (Reference 10 Digit Portfolio Account No.)
        (Reference Shareholder's Name)
- --------------------------------------------------------------------------------

SELLING SHARES

Through an Institutional Account.

Institutions  may sell (redeem)  shares through their  institutional  account by
contacting their Northern account representative.

Directly through the Trust.  Institutions that purchase shares directly from the
Trust may redeem their shares through the Transfer Agent in one of the following
ways:
- --------------------------------------------------------------------------------

By Mail

Send a written request to:

        Northern Institutional Funds
        c/o The Northern Trust Company
        P.O. Box 75943
        Chicago, Illinois 60675-5943

The letter of instruction must include:

      The signature of a duly authorized person
      Your account number
      The name of the Portfolio
      The number of shares or the dollar amount to be redeemed
- --------------------------------------------------------------------------------

By Telephone

      Call the Transfer Agent at 1-800-637-1380 for instructions
      During  periods  of  unusual  economic  or  market   activity,   telephone
     redemptions  may be difficult  to  implement.  In such event,  shareholders
     should follow the  procedures  outlined  above under  "Selling  Shares - By
     Mail."
- --------------------------------------------------------------------------------


By Wire

      Call the Transfer Agent at 1-800-637-1380 for instructions.  You must have
      given prior  authorization  for  expedited  wire  redemption.  The minimum
      amount that may be redeemed by this method is $10,000.

Account Policies and Other Information

Purchase and Redemption  Minimums.  There is a minimum initial  investment of $5
million in the  Portfolio  and one or more other  investment  Portfolios  of the
Trust. There is no minimum for subsequent investments. A $10,000 minimum applies
for  redemptions  by wire.  The Trust  reserves the right to waive  purchase and
redemption minimums and to determine the manner in which a minimum is satisfied.

Calculating Share Price. The Trust issues shares and redeems shares at net asset
value  ("NAV").  The NAV for each share class of the  Portfolio is calculated by
dividing the value of the Portfolio's net assets attributed to that class by the
number of outstanding shares of that class. The NAV for each class is calculated
as of 3:00 p.m.,  Chicago time,  each Business Day. The NAV used in  determining
the price of your shares is the one calculated after your purchase,  exchange or
redemption order is received and accepted as described below.

U.S. and foreign securities held by the Portfolio  generally are valued at their
market prices.  Shares of an investment company held by the Portfolio are valued
at their net asset value. Any securities,  including restricted securities,  for
which  market  prices  are not  readily  available  are  valued at fair value as
determined  by  the  Investment  Adviser.  Short-term  obligations  held  by the
Portfolio are valued at their amortized cost which,  according to the Investment
Adviser, approximates market value.

The Portfolio may hold foreign  securities  that trade on weekends or other days
when the  Portfolio  does not price  its  shares.  Therefore,  the value of such
securities may change on days when  shareholders will not be able to purchase or
redeem shares.

Timing of Purchase  Requests.  Requests  accepted by the Transfer Agent or other
authorized  intermediary by 3:00 p.m., Chicago time, on any Business Day will be
executed the same day, at that day's  closing  share price (plus any  additional
transaction fee) provided that either:

      The  Transfer  Agent  receives  the  purchase  price in  Federal  or other
     immediately  available funds prior to 3:00 p.m.,  Chicago time, on the same
     Business Day;
      The order is accepted by an authorized intermediary and payment in Federal
     or other  immediately  available  funds is made on the  next  Business  Day
     according to procedures authorized by the Trust; or
      Payment in Federal or other immediately available funds is received on the
     next Business Day in an institutional  account  maintained with Northern or
     an affiliate.

Orders  received by the Transfer  Agent or other  authorized  intermediary  on a
non-Business  Day or after 3:00 p.m.  on a Business  Day will be executed on the
next  Business  Day, at that day's  closing  share  price  (plus any  additional
transaction  fee),  provided  that  payment  is  made  as  noted  above.  If  an
Institution  pays for  shares by check,  Federal  funds  generally  will  become
available within two Business Days after a purchase order is received.

In  certain  circumstances,  the Trust may  advance  the time by which  purchase
orders must be received. See "Early Closings" on page 16.

Tax Identification  Number.  Federal  regulations  require you to provide to the
Transfer  Agent a  taxpayer  identification  number  when you  open an  account.
Purchase  orders  without such a number or an indication  that a number has been
applied for will not be  accepted.  If you have  applied for a number,  you must
provide it to the Transfer Agent within 60 days of the date of the order.

In-Kind  Purchases  and  Redemptions.  The  Trust  reserves  the right to accept
payment for shares in the form of securities  that are  permissible  investments
for the  Portfolio.  The Trust also reserves the right to pay  redemptions  by a
distribution  "in-kind" of securities (instead of cash) from the Portfolio.  See
the Statement of Additional  Information for further information about the terms
of these purchases and redemptions.

Miscellaneous Purchase Information.

      Institutions  are  responsible  for  transmitting  purchase  orders to the
     Transfer Agent and delivering required funds on a timely basis.
      Institutions  are responsible for all losses and expenses of the Portfolio
     in the event of any failure to make  payment  according  to the  procedures
     outlined in this Prospectus. Northern may redeem shares from any account it
     maintains to protect the Portfolio and Northern  against loss. In addition,
     a $20 charge will be imposed if a check does not clear.
      The Trust reserves the right to reject any purchase order.  The Trust also
     reserves the right to change or discontinue any of its purchase procedures.

Timing of Redemption and Exchange  Requests.  Redemption  and exchange  requests
received in good order by the Transfer Agent or other authorized intermediary by
3:00 p.m., Chicago time, on a Business Day will be executed on the same day. The
redemption  or exchange will be effected at that day's closing share price (plus
any  additional  transaction  fee,  in the  case  of an  exchange  into  certain
Portfolios).  Redemption  proceeds will normally be sent or credited on the next
Business Day.

Orders received in good order on a non-Business Day or after 3:00 p.m.,  Chicago
time,  on a Business Day will be executed the next  Business  Day, at that day's
closing  share price  (plus any  additional  transaction  fee, in the case of an
exchange  into  certain  Portfolios).  The  proceeds  will  normally  be sent or
credited  the second  Business  Day. We consider  requests to be in "good order"
when all  required  documents  are  properly  completed,  signed  and  received,
including a  certified  corporate  resolution  or other  acceptable  evidence of
authority.

In certain circumstances, the Trust may advance the time by which redemption and
exchange orders must be received. See "Early Closings" on page 16.

Miscellaneous  Redemption  Information.  All redemption proceeds will be sent by
check unless the Transfer Agent is directed  otherwise.  Redemption proceeds may
also be wired.  A redemption  request may not be processed if a shareholder  has
failed to submit a completed  and  properly  executed  new account  application,
including a corporate resolution or other acceptable evidence of authority.

      The  Trust  reserves  the  right to defer  crediting,  sending  or  wiring
     redemption  proceeds for up to 7 days after receiving the redemption  order
     if,  in its  judgment,  an  earlier  payment  could  adversely  affect  the
     Portfolio.
      If you are redeeming  recently  purchased shares,  your redemption request
     may not be honored until your check or electronic  transaction has cleared.
     This may delay your transaction for up to 15 days.
      Institutions  are responsible for  transmitting  redemption  orders to the
     Transfer  Agent and crediting  their  Customers'  accounts with  redemption
     proceeds on a timely basis.
      Redemption  requests  by mail  must be signed  by a person  authorized  by
     acceptable documentation on file with the Transfer Agent.
      The Trust reserves the right to redeem shares held by any  shareholder who
     provides  incorrect  or  incomplete   account   information  or  when  such
     involuntary  redemptions are necessary to avoid adverse consequences to the
     Trust and its shareholders.
      The Trust may require any information  reasonably necessary to ensure that
      a redemption  has been duly  authorized.  The Trust  reserves the right to
      change or discontinue any of its redemption procedures.

Exchange  Privileges.  Institutions and their Customers (to the extent permitted
by their account  agreements)  may exchange shares of the Portfolio for the same
class of shares of another Portfolio. The registration of both accounts involved
must be  identical.  A $1,000  minimum  investment  applies.  An  exchange  is a
redemption  of shares of one  Portfolio  and the  purchase  of shares of another
Portfolio. It is considered a taxable event and may result in a gain or loss.

The Trust reserves the right to change or discontinue the exchange  privilege at
any time upon 60 days written notice to shareholders  and to reject any exchange
request. Exchanges are only available in states where an exchange can legally be
made.  Before making an exchange you should read the  prospectus  for the shares
you are acquiring.

Telephone Transactions. For your protection,  telephone requests may be recorded
in order to verify their accuracy.  In addition,  the Transfer Agent has adopted
procedures in an effort to establish  reasonable  safeguards  against fraudulent
telephone  transactions.  If  reasonable  measures  are  taken  to  verify  that
telephone instructions are genuine, the Trust and its service providers will not
be  responsible   for  any  loss  resulting  from   fraudulent  or  unauthorized
instructions received over the telephone.  In these circumstances,  shareholders
will bear the risk of loss.  During periods of unusual market activity,  you may
have trouble  placing a request by telephone.  In this event,  consider  sending
your request in writing.

The proceeds of redemption  orders  received by telephone will be sent by check,
wire or  transfer  according  to proper  instructions.  All checks  will be made
payable  to the  shareholder  of record  and  mailed  only to the  shareholder's
address of record.

The Trust reserves the right to refuse a telephone redemption.

Making  Changes  to Your  Account  Information.  You may make  changes to wiring
instructions,  address of record, or other account  information only in writing.
These  instructions  must be  accompanied by a certified  corporate  resolution,
signature  guarantee  from an  institution  participating  in the Stock Transfer
Agency Medallion Program ("STAMP"),  or other acceptable  evidence of authority.
In accordance  with SEC  regulations,  the Trust and Transfer Agent may charge a
shareholder reasonable costs in locating a shareholder's current address.

Business Day. A "Business  Day" is each Monday  through Friday when the New York
Stock Exchange (the "Exchange") is open for business.  A "Business Day" does not
include a holiday  observed by the Exchange.  In 1999 these days are: New Year's
Day, Martin Luther King, Jr. Day,  Presidents'  Day, Good Friday,  Memorial Day,
Independence Day, Labor Day, Thanksgiving and Christmas Day.

Early  Closings.  The Portfolio  reserves the right to cease,  or to advance the
time for,  accepting  purchase,  redemption or exchange orders for same Business
Day credit when  Northern or the  Exchange  closes  early as a result of unusual
weather or other  conditions.  It also  reserves this right when The Bond Market
Association recommends that securities markets close or close early.

Authorized   Intermediaries.   The  Trust  may   authorize   certain   financial
intermediaries  (including  banks,  trust  companies,   brokers  and  investment
advisers),  which provide  recordkeeping,  reporting and processing services, to
accept  purchase,  redemption and exchange orders from their Customers on behalf
of the  Trust.  They may also  designate  other  intermediaries  to accept  such
orders, if approved by the Trust. Authorized  intermediaries are responsible for
transmitting  orders and delivering  funds on a timely basis. The Portfolio will
be deemed to have received an order when the order is accepted by the authorized
intermediary  on a Business Day, and the order will be priced at the Portfolio's
per share NAV next determined.

Servicing  Agents.   Certain  Institutions  may  perform  (or  arrange  to  have
performed)  various  administrative  support  services for Customers who are the
beneficial  owners  of Class C or D shares  through  agreements  with the  Trust
("Servicing   Agents").   These  agreements  are  permitted  under  the  Trust's
Shareholder  Servicing  Plan.  The  level of  support  services  required  by an
Institution  and its Customers  generally will  determine  whether they purchase
Class A, C or D shares.

Administrative support services may include:

      processing purchase and redemption requests from investors;
      placing net purchase and redemption orders with the Transfer Agent;
      providing  necessary  personnel  and  facilities to establish and maintain
      investor accounts and records; and providing  information  periodically to
      investors showing their positions in Portfolio shares.

The fees paid to  Servicing  Agents  with  respect to Class C and Class D Shares
will be borne  exclusively  by the  beneficial  owners  of Class C and D shares,
respectively. Please note that Northern may also provide compensation to certain
dealers  and  other  financial  intermediaries  who  provide  services  to their
Customers  who  invest  in the  Trust or whose  Customers  purchase  significant
amounts of the Portfolio's  shares.  The amount of such compensation may be made
on a one-time and/or  periodic basis,  and may represent all or a portion of the
annual fees earned by Northern as Investment Adviser (after  adjustments).  This
additional  compensation will be paid by Northern or its affiliates and will not
represent an additional expense to the Trust or its shareholders.

Customers  purchasing  shares through an  Institution  should read their account
agreements carefully. An Institution's requirements may differ from those listed
in this  Prospectus.  An Institution  may also impose account  charges,  such as
asset allocation  fees,  account  maintenance  fees, and other charges that will
reduce the net  return on an  investment  in the  Portfolio.  If a Customer  has
agreed with a  particular  Institution  to maintain a minimum  balance  with the
Institution  and the  balance  falls below this  minimum,  the  Customer  may be
required to redeem all or a part of his investment in the Portfolio.

Conflict of interest  restrictions may apply to the receipt of compensation paid
by the Trust to a Servicing Agent in connection with the investment of fiduciary
funds in Portfolio shares. Banks and other institutions  regulated by the Office
of Comptroller of the Currency, Board of Governors of the Federal Reserve System
and state banking commissions,  and investment advisers and other money managers
subject  to the  jurisdiction  of the  SEC,  the  Department  of  Labor or state
securities commissions,  are urged to consult legal counsel before entering into
servicing agreements.

State  securities  laws  regarding the  registration  of dealers may differ from
Federal law. As a result,  Institutions  investing in the Portfolio on behalf of
their Customers may be required to register as dealers.

Dividends and Distributions

Dividends and capital gain  distributions  of the  Portfolio  are  automatically
reinvested  in additional  shares of the  Portfolio  without any sales charge or
additional purchase price amount.

You may,  however,  elect to have  dividends or capital gain  distributions  (or
both)  paid in cash or  reinvested  in the  same  class  of  shares  of  another
Portfolio  at their net asset  value per  share.  If you would  like to  receive
dividends or distributions in cash or have them reinvested in another Portfolio,
you must  notify the  Transfer  Agent in  writing  at least two days  before the
dividend or distribution  record date.  Dividends and  distributions may only be
reinvested in the Portfolio in which you maintain an account.

The  Portfolio  will  declare  and pay  dividends  and  capital  gains,  if any,
annually.  The  Portfolio  may,  in some years,  make  additional  dividends  or
distributions to the extent necessary for it to avoid incurring  unnecessary tax
liabilities.

TAX CONSIDERATIONS

The Portfolio intends to qualify as a regulated  investment  company for Federal
tax purposes,  and to distribute to  shareholders  substantially  all of its net
investment   income  and  net  capital  gain.  The  Portfolio's   dividends  and
distributions  will be taxable to you for  Federal,  state and local  income tax
purposes, unless you have a tax-advantaged account.  Dividends and distributions
are taxable whether they are received in cash or reinvested in Portfolio shares.
In general,  distributions  attributable to interest,  dividend, certain foreign
exchange gain and short-term capital gain income of the Portfolio are taxable to
you as ordinary income. Distributions attributable to long-term capital gains of
the  Portfolio are generally  taxable to you as capital  gains.  This is true no
matter how long you own your shares.

There are certain tax  requirements  that the Portfolio  must follow in order to
avoid  Federal  taxation.  In its efforts to adhere to these  requirements,  the
Portfolio  may  have  to  limit  its  investment   activity  in  some  types  of
instruments.

A  portion  of  the  dividends  paid  by  the  Portfolio  may  qualify  for  the
dividends-received deduction for corporations.

The sale of Portfolio  shares is a taxable  event on which a gain or loss may be
recognized.  For tax purposes, an exchange is considered the same as a sale. The
amount of gain or loss is based on the difference  between your tax basis in the
Portfolio  shares  and  the  amount  you  receive  for  them  upon  disposition.
Generally,  you will recognize a long-term capital gain or loss if you have held
your  Portfolio  shares for over twelve  months at the time you sell or exchange
them.  Shares held six months or less may also generate a long-term capital loss
to the extent of any capital  gains  distributions  received on the shares while
they                were                held               by               you.
- --------------------------------------------------------------------------------

TIMING

Dividends and distributions  from the Portfolio will generally be taxable to you
in the tax year in which  they are  paid,  with  one  exception.  Dividends  and
distributions  declared by the  Portfolio  in October,  November or December and
paid in January are taxed as though they were paid by December 31.

Every year, the Trust will send you information detailing the amount of ordinary
income and capital gains distributed to your account for the previous year.
- --------------------------------------------------------------------------------

TAX EFFECT
OF "BUYING
A DIVIDEND"

The  Portfolio's  share price may, at any time,  reflect  undistributed  capital
gains or income and unrealized appreciation. When these amounts are distributed,
they will be taxable to you. For this reason,  you should be especially  mindful
that if you buy  shares on or just  before  the  record  date of a  dividend  or
capital gains distribution,  you will pay the full price for the shares and then
receive  back a portion  of the money  you have just  invested  in the form of a
taxable dividend or capital gain.

Your  investment in the Portfolio could have  additional tax  consequences.  You
should  consult  your  tax  professional  for  information   regarding  all  tax
consequences  applicable  to  your  investments  in  the  Portfolio.   More  tax
information is provided in the Statement of Additional  Information.  This short
summary is not intended as a substitute for careful tax planning.
- --------------------------------------------------------------------------------

Year 2000 Issues

Like every other business  dependent upon computerized  information  processing,
Northern Trust Corporation ("Northern Trust") must deal with "Year 2000" issues.

Many  computer  systems use two digits  rather  than four to identify  the year.
Unless adapted,  these systems may not be able to correctly distinguish the Year
2000 from the Year 1900. As the Year 2000 approaches, many systems may be unable
to  accurately  process  certain  date-based  information,  which  could cause a
variety  of  operational  problems  for  businesses.  This could have a negative
effect on the  companies in which the Portfolio  invests,  thus  decreasing  the
Portfolio's investment returns.

Northern Trust has implemented  steps to prepare its critical  computer  systems
and processes for Year 2000 processing. It has established a dedicated Year 2000
Project Team whose members have significant  systems development and maintenance
experience.  Northern Trust's Year 2000 project includes a comprehensive testing
plan of its critical  systems.  Northern Trust has advised the Trust that it has
substantially  completed  work on its critical  systems and testing with outside
parties.

Northern  Trust also has a program to  monitor  and assess the  efforts of other
parties,  such as other service providers to the Portfolio.  However,  it cannot
control the success of those other parties' efforts. Contingency plans are being
established to provide  Northern Trust with  alternatives in case these entities
experience significant Year 2000 difficulties that impact Northern Trust.

Furthermore,  even if the actions taken by Northern  Trust are  successful,  the
normal operations of the Portfolio may, in any event, be disrupted significantly
by the failure of  communications  and public  utility  companies,  governmental
entities,  financial  processors or others to perform their services as a result
of Year 2000 problems.

Efforts in foreign  countries to remediate  potential Year 2000 problems are not
as extensive  as those in the United  States.  As a result,  the  operations  of
foreign markets,  foreign issuers,  and foreign  governments may be disrupted by
the Year 2000  problem  and the  investment  holdings  of the  Portfolio  may be
adversely affected.



<PAGE>


                        RISKS, SECURITIES AND TECHNIQUES

This section takes a closer look at some of the Portfolio's principal investment
strategies and related risks. It also explores the various investment securities
and techniques that the investment  management team may, but is not required to,
use. The  Portfolio  may invest in other  securities  and are subject to further
restrictions  and risks  which are  described  in the  Statement  of  Additional
Information.  You should note that the Portfolio's  investment  objective may be
changed  by  the  Trust's  Board  of  Trustees  without  shareholder   approval.
Shareholders  will,  however,  be notified of any  changes.  Any such change may
result  in the  Portfolio  having an  investment  objective  different  from the
objective which the shareholder considered appropriate at the time of investment
in the Portfolio.

ADDITIONAL INFORMATION ON PRINCIPAL INVESTMENT STRATEGIES AND RELATED RISKS

PORTFOLIO  TURNOVER.  The  investment  management  team  will not  consider  the
Portfolio turnover rate a limiting factor in making investment decisions for the
Portfolio.  The Portfolio's  annual  portfolio  turnover rate is not expected to
exceed 200%. A high  portfolio  turnover rate (100% or more) may involve  higher
brokerage  commissions  and other  transaction  costs,  which  could  reduce the
Portfolio's  return. It may also result in higher short-term  capital gains that
are taxable to shareholders.  The Trust expects that the annual turnover rate of
the Portfolio will generally not exceed 400%.

SMALL COMPANY INVESTMENTS. Investments in small capitalization companies involve
greater  risk  and  portfolio  price   volatility  than  investments  in  larger
capitalization  stocks.  Among the reasons for the greater  price  volatility of
these investments are the less certain growth prospects of smaller firms and the
lower  degree  of  liquidity   in  the  markets  for  such   securities.   Small
capitalization  companies  may be  thinly  traded  and may  have to be sold at a
discount from current market prices or in small lots over an extended  period of
time.  Because of the lack of  sufficient  market  liquidity,  the Portfolio may
incur losses  because it will be required to effect  sales at a  disadvantageous
time and only then at a substantial dip in price. Small capitalization companies
include "unseasoned" issuers that do not have an established  financial history;
often have limited product lines, markets or financial resources;  may depend on
or use a few key personnel for management;  and may be susceptible to losses and
risks of bankruptcy.  Transaction  costs for these  investments are often higher
than   those  of  larger   capitalization   companies.   Investments   in  small
capitalization  companies may be more  difficult to price  precisely  than other
types of securities because of their characteristics and lower trading volumes.

TEMPORARY   INVESTMENTS.   Short-term   obligations  refer  to  U.S.  government
securities,  high-quality money market instruments  (including  commercial paper
and  obligations of foreign and domestic banks such as  certificates of deposit,
bank and  deposit  notes,  bankers'  acceptances  and fixed time  deposits)  and
repurchase  agreements  with maturities of 13 months or less.  Generally,  these
obligations are purchased to provide stability and liquidity to the Portfolio.

           INVESTMENT  STRATEGY.  The Portfolio may invest all or any portion of
           its assets in  short-term  obligations  pending  investment,  to meet
           anticipated  redemption  requests or as a temporary defensive measure
           in response to adverse market or economic conditions.

          SPECIAL RISKS. The Portfolio may not achieve its investment  objective
     when its assets are invested in short-term obligations.


<PAGE>


ADDITIONAL DESCRIPTION OF SECURITIES AND COMMON INVESTMENT TECHNIQUES

ASSET-BACKED SECURITIES.  Asset-backed securities are sponsored by entities such
as government agencies,  banks, financial companies and commercial or industrial
companies.  They  represent  interests in pools of mortgages or other  cash-flow
producing  assets such as automobile  loans,  credit card  receivables and other
financial  assets.  In effect,  these  securities  "pass  through"  the  monthly
payments that  individual  borrowers make on their mortgages or other assets net
of any fees paid to the issuers.  Examples of these include guaranteed  mortgage
pass-through certificates, collateralized mortgage obligations ("CMOs") and real
estate mortgage investment conduits ("REMICs").

           INVESTMENT  STRATEGY.  The  Portfolio  may purchase  various types of
           asset-backed  securities.  The Portfolio will invest in  asset-backed
           securities  rated  investment  grade  (rated  "BBB" or better by S&P,
           Duff,  Fitch or Moody's) at the time of purchase.  The  Portfolio may
           also  invest  in  unrated   mortgage-backed   securities   which  the
           Investment Adviser believes are of comparable quality.

           SPECIAL  RISKS.  In addition to credit and market risk,  asset-backed
           securities  involve  prepayment  risk because the  underlying  assets
           (loans) may be prepaid at any time. The value of these securities may
           also  change   because  of  actual  or   perceived   changes  in  the
           creditworthiness  of the  originator,  the servicing  agent,  and the
           financial   institution   providing   the   credit   support  or  the
           counterparty. Like other fixed income securities, when interest rates
           rise, the value of an asset-backed  security  generally will decline.
           However,  when interest rates decline,  the value of an  asset-backed
           security with prepayment features may not increase as much as that of
           other fixed income securities. In addition, non-mortgage asset-backed
           securities  involve  certain risks not  presented by  mortgage-backed
           securities.  Primarily,  these  securities do not have the benefit of
           the same security interest in the underlying collateral.  Credit card
           receivables are generally unsecured,  and the debtors are entitled to
           the protection of a number of state and Federal consumer credit laws.
           Automobile  receivables  are subject to the risk that the trustee for
           the holders of the automobile  receivables  may not have an effective
           security interest in all of the obligations backing the receivables.

BORROWINGS  AND REVERSE  REPURCHASE  AGREEMENTS.  The Portfolio can borrow money
from banks and enter into  reverse  repurchase  agreements  with banks and other
financial  institutions.  Reverse  repurchase  agreements  involve  the  sale of
securities  held  by the  Portfolio  subject  to the  Portfolio's  agreement  to
repurchase them at a mutually agreed upon date and price (including interest).

           INVESTMENT  STRATEGY.   The  Portfolio  may  borrow  in  amounts  not
           exceeding  one-third  of  its  total  assets  (including  the  amount
           borrowed).  These  transactions  may be entered  into as a  temporary
           measure for emergency  purposes or to meet redemption  requests.  The
           Portfolio  may  utilize  reverse   repurchase   agreements  when  the
           investment  management  team expects  that the interest  income to be
           earned  from  the  investment  of the  transaction  proceeds  will be
           greater than the related interest  expense.  The Portfolio's  reverse
           repurchase agreements,  together with any other borrowings,  will not
           exceed,  in the aggregate,  33 1/3% of the value of its total assets.
           In addition,  whenever  borrowings exceed 5% of the Portfolio's total
           assets, the Portfolio will not make any investments.

           SPECIAL RISKS.  Borrowings and reverse repurchase  agreements involve
           leveraging.  If the securities held by the Portfolio decline in value
           while these transactions are outstanding,  the net asset value of the
           Portfolio's   outstanding   shares   will   decline   in   value   by
           proportionately more than the decline in value of the securities.  In
           addition,  reverse  repurchase  agreements involve the risks that the
           interest  income earned by the Portfolio  (from the investment of the
           proceeds) will be less than the interest  expense of the transaction,
           that the market value of the  securities  sold by the Portfolio  will
           decline  below  the  price  the  Portfolio  is  obligated  to  pay to
           repurchase  the  securities,  and  that  the  securities  may  not be
           returned to the Portfolio.

CONVERTIBLE SECURITIES. A convertible security is a bond or preferred stock that
may be converted (exchanged) into the common stock of the issuing company within
a  specified  time  period  for a  specified  number of  shares.  They offer the
Portfolio a way to participate in the capital  appreciation  of the common stock
into which the securities are  convertible,  while earning higher current income
than is available from the common stock.

          INVESTMENT STRATEGY. The Portfolio may acquire convertible securities.
     These  securities  are  subject to the same  rating  requirements  as fixed
     income securities held by the Portfolio.

INVESTMENT GRADE  SECURITIES.  A security is considered  investment grade if, at
the time of purchase, it is rated:

        BBB or higher by S&P;  Baa or higher by Moody's;  BBB or higher by Duff;
        or BBB or higher by Fitch.

A security will be considered  investment  grade if it receives one of the above
ratings, even if it receives a lower rating from other rating organizations.

       INVESTMENT STRATEGY. Except as stated below, fixed income and convertible
       securities  purchased by the Portfolio will generally be rated investment
       grade.  The  Portfolio  may also  invest  in  unrated  securities  if the
       Investment Adviser believes they are comparable in quality.

       SPECIAL  RISKS.  Although  securities  rated BBB by  Standard  and Poor's
       Rating Services ("S&P"), Duff & Phelps Credit Rating Co. ("Duff"),  Fitch
       IBCA  Inc.  ("Fitch"),   or  Baa  by  Moody's  Investors  Service,   Inc.
       ("Moody's")   are  considered   investment   grade,   they  have  certain
       speculative  characteristics.  Therefore, they may be subject to a higher
       risk of default than obligations  with higher ratings.  Subsequent to its
       purchase by the Portfolio,  a rated security may cease to be rated or its
       rating may be reduced below the minimum  rating  required for purchase by
       the  Portfolio.  The  Investment  Adviser will  consider such an event in
       determining whether the Portfolio should continue to hold the security.

DERIVATIVES.  The Portfolio may purchase  certain  "derivative"  instruments.  A
derivative  is a financial  instrument  whose value is derived  from---or  based
upon---the performance of underlying assets, interest or currency exchange rates
or indices.  Many types of  instruments  representing  a wide range of potential
risks and rewards are derivatives,  including futures contracts, options, equity
swaps,  structured  securities,  forward currency  contracts and structured debt
obligations  (including  collateralized  mortgage obligations and other types of
asset-backed  securities,   "stripped"  securities  and  various  floating  rate
instruments, including inverse floaters).

           INVESTMENT STRATEGY. The Portfolio will invest in derivatives only if
           the potential  risks and rewards are consistent  with the Portfolio's
           objective, strategies and overall risk profile. The Portfolio may use
           derivatives  for hedging  purposes to offset a potential  loss in one
           position by  establishing  an interest in an opposite  position.  The
           Portfolio may also use derivatives for speculative purposes to invest
           for potential income or capital gain.

           SPECIAL RISKS.  Engaging in derivative  transactions involves special
           risks,  including  (a) market risk that the  Portfolio's  derivatives
           position will lose value;  (b) credit risk that the  counterparty  to
           the transaction  will default;  (c) leveraging risk that the value of
           the  derivative  instrument  will  decline more than the value of the
           assets on which it is based;  (d) illiquidity risk that the Portfolio
           will be unable to sell its  position  because of lack of market depth
           or  disruption;  (e)  pricing  risk  that the  value of a  derivative
           instrument  will be difficult to determine;  and (f) operations  risk
           that  loss  will  occur as a result of  inadequate  systems  or human
           error.  Many types of  derivatives  have been recently  developed and
           have not been tested over complete market cycles.  For these reasons,
           the  Portfolio  may suffer a loss  whether or not the analysis of the
           investment management team is accurate

EQUITY SWAPS.  Equity swaps allow the parties to the swap  agreement to exchange
components  of  return  on one  equity  investment  (e.g.,  a basket  of  equity
securities  or an index)  for a  component  of return on another  non-equity  or
equity investment, including an exchange of differential rates of return.

           INVESTMENT STRATEGY. The Portfolio may invest in equity swaps. Equity
           swaps  may be used to  invest  in a market  without  owning or taking
           physical  custody  of  securities  in   circumstances   where  direct
           investment  may be  restricted  for  legal  reasons  or is  otherwise
           impractical.  Equity swaps may also be used for other purposes,  such
           as hedging or seeking to increase total return.

           SPECIAL  RISKS.  Equity swaps are  derivative  instruments  and their
           values  can be very  volatile.  To the  extent  that  the  investment
           management team does not accurately analyze and predict the potential
           relative  fluctuation on the components swapped with the other party,
           the Portfolio may suffer a loss.  The value of some  components of an
           equity  swap (such as the  dividends  on a common  stock) may also be
           sensitive  to  changes in  interest  rates.  Furthermore,  during the
           period a swap is outstanding,  the Portfolio may suffer a loss if the
           counterparty defaults.

NON-INVESTMENT   GRADE  SECURITIES.   Non-investment   grade  fixed  income  and
convertible  securities  (sometimes  referred to as "junk  bonds") are generally
rated BB or below by S&P, Duff or Fitch, or Ba by Moody's.

       INVESTMENT  STRATEGY.  The  Portfolio  may  invest up to 15% of its total
       assets in non-investment grade securities when the investment  management
       team  determines  that  such  securities  are  desirable  in light of the
       Portfolio's investment objective and portfolio mix.

       SPECIAL  RISKS.  Non-investment  grade  securities are subject to greater
       risk  than  investment  grade  securities.  The  market  value  of  these
       low-rated  securities tends to be more sensitive to individual  corporate
       developments  and changes in interest rates and economic  conditions than
       higher-rated  securities.  In addition,  they generally  present a higher
       degree of credit risk.  Issuers of low-rated  securities are often highly
       leveraged,  so their  ability  to repay  their  debt  during an  economic
       downturn or periods of rising interest rates may be impaired. The risk of
       loss due to default by these  issuers is also greater  because  low-rated
       securities  generally are  unsecured  and are generally  less liquid than
       higher quality  securities.  If an issuer defaulted,  the Portfolio could
       incur additional expenses seeking recovery of its investment.

FOREIGN  INVESTMENTS.  Foreign securities include direct investments in non-U.S.
dollar-denominated   securities   traded   outside  of  the  United  States  and
dollar-denominated  securities  of  foreign  issuers.  Foreign  securities  also
include indirect  investments  such as American  Depository  Receipts  ("ADRs"),
European  Depository  Receipts ("EDRs") and Global Depository Receipts ("GDRs").
ADRs are U.S.  dollar-denominated  receipts representing shares of foreign-based
corporations.  ADRs are issued by U.S. banks or trust companies, and entitle the
holder to all dividends  and capital  gains that are paid out on the  underlying
foreign  shares.  EDRs  and GDRs  are  receipts  issued  by  non-U.S.  financial
institutions that often trade on foreign exchanges.  They represent ownership in
an  underlying  foreign or U.S.  security  and are  generally  denominated  in a
foreign currency.

          INVESTMENT  STRATEGY.  The Portfolio may invest up to 25% of its total
     assets in foreign securities, including ADRs, EDRs and GDRs.

           SPECIAL RISKS.  Foreign  securities  involve special risks and costs.
           Foreign  securities,  and in particular foreign debt securities,  are
           sensitive to changes in interest  rates.  In addition,  investment in
           the securities of foreign governments  involves the risk that foreign
           governments  may default on their  obligations  or may  otherwise not
           respect the integrity of their debt.  The  performance of investments
           in securities  denominated in a foreign currency will also depend, in
           part, on the strength of the foreign currency against the U.S. dollar
           and  the  interest  rate  environment  in  the  country  issuing  the
           currency.  Absent other events which could otherwise affect the value
           of a foreign  security (such as a change in the political  climate or
           an issuer's credit quality), appreciation in the value of the foreign
           currency  generally  results  in an  increase  in value of a  foreign
           currency-denominated  security in terms of U.S. dollars. A decline in
           the  value  of the  foreign  currency  relative  to the  U.S.  dollar
           generally   results   in  a   decrease   in   value   of  a   foreign
           currency-denominated security.

           Investment  in  foreign  securities  may  involve  higher  costs than
           investment  in U.S.  securities,  including  higher  transaction  and
           custody  costs  as well as the  imposition  of  additional  taxes  by
           foreign  governments.  Foreign  investments  may also  involve  risks
           associated with the level of currency  exchange rates,  less complete
           financial information about the issuers, less market liquidity,  more
           market  volatility and political  instability.  Future  political and
           economic  developments,  the possible imposition of withholding taxes
           on  dividend  income,  the  possible  seizure or  nationalization  of
           foreign holdings,  the possible establishment of exchange controls or
           freezes on the  convertibility of currency,  or the adoption of other
           governmental  restrictions  might  adversely  affect an investment in
           foreign securities.  Additionally, foreign banks and foreign branches
           of  domestic  banks  may  be  subject  to  less   stringent   reserve
           requirements, and to different accounting, auditing and recordkeeping
           requirements.

           Additional  risks are  involved  when  investing  in  countries  with
           emerging economies or securities markets. These countries are located
           in the Asia/Pacific  region,  Eastern Europe, Latin and South America
           and Africa. In general, the securities markets of these countries are
           less liquid,  are subject to greater price  volatility,  have smaller
           market capitalizations and have problems with securities registration
           and  custody.   In  addition,   because  the  securities   settlement
           procedures are less developed in these  countries,  the Portfolio may
           be required to deliver  securities  receiving payment and may also be
           unable to  complete  transactions  during  market  disruptions.  As a
           result of these  and  other  risks,  investments  in these  countries
           generally present a greater risk of loss to the Portfolio.

           While the Portfolio's  investments may, as permitted,  be denominated
           in foreign currencies, the portfolio securities and other assets held
           by the Portfolio are valued in U.S. dollars.  Currency exchange rates
           may  fluctuate  significantly  over short periods of time causing the
           Portfolio's net asset value to fluctuate as well.  Currency  exchange
           rates  can  be  affected  unpredictably  by the  intervention  or the
           failure to intervene by U.S. or foreign governments or central banks,
           or by currency  controls  or  political  developments  in the U.S. or
           abroad.  To the extent  that the  Portfolio  is  invested  in foreign
           securities  while  also  maintaining  currency  positions,  it may be
           exposed  to greater  combined  risk.  The  Portfolio's  net  currency
           positions  may  expose  it to  risks  independent  of its  securities
           positions.

           The introduction of a single  currency,  the euro, on January 1, 1999
           for participating nations in the European Economic and Monetary Union
           presents  unique  uncertainties,  including  the legal  treatment  of
           certain  outstanding  financial  contracts after January 1, 1999 that
           refer to existing  currencies rather than the euro; the establishment
           and maintenance of exchange rates for currencies being converted into
           the euro; the fluctuation of the euro relative to non-euro currencies
           during the  transition  period from  January 1, 1999 to December  31,
           2001 and beyond;  whether the interest rate, tax and labor regimes of
           European countries participating in the euro will converge over time;
           and whether the  conversion of the  currencies of other  countries in
           the European  Union ("EU"),  such as the United  Kingdom and Denmark,
           into the euro and the  admission  of other non-EU  countries  such as
           Poland,  Latvia and Lithuania as members of the EU may have an impact
           on the euro. These or other factors, including political and economic
           risks, could cause market disruptions, and could adversely affect the
           value of securities held by the Portfolio.

FORWARD CURRENCY EXCHANGE CONTRACTS.  A forward currency exchange contract is an
obligation  to exchange one currency for another on a future date at a specified
exchange rate.

           INVESTMENT  STRATEGY.  The Portfolio may enter into forward  currency
           exchange  contracts for hedging purposes and to help reduce the risks
           and volatility  caused by changes in foreign currency exchange rates.
           Foreign currency exchange contracts will be used at the discretion of
           the investment  management team, and the Portfolio is not required to
           hedge its foreign currency positions.

           SPECIAL  RISKS.  Forward  foreign  currency  contracts  are privately
           negotiated  transactions,  and can have substantial price volatility.
           As a result,  they offer less protection against default by the other
           party than is available for instruments  traded on an exchange.  When
           used for hedging purposes, they tend to limit any potential gain that
           may be  realized  if the value of the  Portfolio's  foreign  holdings
           increases because of currency fluctuations. When used for speculative
           purposes,   forward  currency   exchange   contracts  may  result  in
           additional losses that would not otherwise be incurred.

FUTURES  CONTRACTS  AND  RELATED  OPTIONS.  A  futures  contract  is a  type  of
derivative  instrument  that obligates the holder to buy or sell an asset in the
future at an agreed upon price. For example, a futures contract may obligate the
Portfolio,  at maturity, to take or make delivery of certain domestic or foreign
securities,  the cash  value of a  securities  index or a stated  quantity  of a
foreign currency.  When the Portfolio purchases an option on a futures contract,
it has the  right to assume a  position  as a  purchaser  or seller of a futures
contract  at a  specified  exercise  price  during the option  period.  When the
Portfolio  sells an  option on a  futures  contract,  it  becomes  obligated  to
purchase or sell a futures contract if the option is exercised.

           INVESTMENT  STRATEGY.  To the extent  consistent  with its investment
           objective,  the Portfolio may invest in futures contracts and options
           on futures  contacts on domestic  or foreign  exchanges  or boards of
           trade.  They may be used for  hedging  purposes,  to  increase  total
           return  or  to  maintain  liquidity  to  meet  potential  shareholder
           redemptions,  invest cash  balances or dividends or minimize  trading
           costs.

           The value of the Portfolio's futures contacts may equal up to 100% of
           its total assets.  However, the Portfolio will not purchase or sell a
           futures  contract  unless,  after  the  transaction,  the  sum of the
           aggregate amount of margin deposits on its existing futures positions
           and the  amount  of  premiums  paid  for  related  options  used  for
           non-hedging purposes is 5% or less of its total assets.

           SPECIAL RISKS.  Futures  contracts and options  present the following
           risks:  imperfect  correlation  between the change in market value of
           the  Portfolio's  securities  and the price of futures  contracts and
           options;  the  possible  inability to close a futures  contract  when
           desired;  losses  due to  unanticipated  market  movements  which are
           potentially  unlimited;  and the possible inability of the investment
           management  team to correctly  predict the  direction  of  securities
           prices,  interest rates,  currency  exchange rates and other economic
           factors.  Foreign exchanges or boards of trade generally do not offer
           the same protections as U.S. exchanges.

ILLIQUID  OR  RESTRICTED  SECURITIES.  Illiquid  securities  include  repurchase
agreements  and time deposits with  notice/termination  dates of more than seven
days,  certain  variable amount master demand notes that cannot be called within
seven days, certain insurance funding  agreements (see below),  certain unlisted
over-the-counter  options and other  securities  that are traded in the U.S. but
are subject to trading  restrictions  because they are not registered  under the
Securities Act of 1933, as amended (the "1933 Act").

           INVESTMENT  STRATEGY.  The  Portfolio may invest up to 15% of its net
           assets in securities that are illiquid.  If otherwise consistent with
           its  investment  objective and  policies,  the Portfolio may purchase
           commercial  paper issued pursuant to Section 4(2) of the 1933 Act and
           domestically traded securities that are not registered under the 1933
           Act but can be sold to "qualified institutional buyers" in accordance
           with Rule 144A under the 1933 Act  ("Rule  144A  Securities").  These
           securities will not be considered  illiquid so long as the Investment
           Adviser determines, under guidelines approved by the Trust's Board of
           Trustees, that an adequate trading market exists.

           SPECIAL  RISKS.  Because  illiquid and  restricted  securities may be
           difficult  to sell at an  acceptable  price,  they may be  subject to
           greater  volatility  and may result in a loss to the  Portfolio.  The
           practice of  investing  in Rule 144A  Securities  could  increase the
           level of the Portfolio's illiquidity during any period that qualified
           institutional   buyers  become   uninterested  in  purchasing   these
           securities.

INSURANCE  FUNDING  AGREEMENTS.  An insurance  funding  agreement  ("IFA") is an
agreement  that requires the Portfolio to make cash  contributions  to a deposit
fund of an insurance  company's  general  account.  The  insurance  company then
credits interest to the Portfolio for a set time period.

           INVESTMENT  STRATEGY.  The Portfolio may invest in IFAs issued by
          insurance companies that meet quality and credit standards established
          by the Investment Adviser.

           SPECIAL RISKS. IFAs are not insured by a government  agency--they are
           backed only by the  insurance  company that issues them. As a result,
           they are subject to default  risk. In addition,  an active  secondary
           market in IFAs does not  currently  exist.  This means that it may be
           difficult to sell an IFA at an appropriate price.

INVESTMENT COMPANIES. To the extent consistent with its investment objective and
policies,  the  Portfolio may invest in  securities  issued by other  investment
companies,  including money market funds and index funds, "country funds" (i.e.,
funds that invest  primarily in issuers located in a specific foreign country or
region),  S&P's Depository  Receipts  ("SPDRs") and similar  securities of other
issuers.

               INVESTMENT  STRATEGY.  Investments  by  the  Portfolio  in  other
          investment  companies  will be subject to the  limitations of the 1940
          Act.

           SPECIAL RISKS. As a shareholder of another  investment  company,  the
           Portfolio would be subject to the same risks as any other investor in
           that company. In addition, it would bear a proportionate share of any
           fees and expenses paid by that company. These would be in addition to
           the advisory and other fees paid directly by the Portfolio.

OPTIONS. An option is a type of derivative  instrument that gives the holder the
right (but not the  obligation)  to buy (a "call") or sell (a "put") an asset in
the future at an agreed upon price prior to the expiration date of the option.

           INVESTMENT  STRATEGY.  To the extent  consistent  with its investment
           objective,  the Portfolio may write (sell) covered call options,  buy
           put  options,  buy call  options  and write  secured  put options for
           hedging purposes or to earn additional income.  Options may relate to
           particular  securities,   foreign  or  domestic  securities  indices,
           financial instruments and foreign currencies.  The Portfolio will not
           purchase put and call options in an amount that exceeds 5% of its net
           assets at the time of  purchase.  The total value of the  Portfolio's
           assets  subject  to  options  written  by the  Portfolio  will not be
           greater than 25% of its net assets at the time the option is written.
           The  Portfolio  may  "cover" a call  option by  owning  the  security
           underlying the option or through other means.  Put options written by
           the Portfolio are "secured" if the Portfolio  maintains liquid assets
           in a  segregated  account in an amount at least equal to the exercise
           price of the option up until the expiration date.

           SPECIAL RISKS.  Options trading is a highly specialized activity that
           involves  investment   techniques  and  risks  different  from  those
           associated with ordinary Portfolio securities transactions. The value
           of options can be highly  volatile,  and their use can result in loss
           if the investment  management team is incorrect in its expectation of
           price  fluctuations.  The  successful  use  of  options  for  hedging
           purposes  also  depends  in part  on the  ability  of the  investment
           management team to predict future price  fluctuations  and the degree
           of correlation between the options and securities markets.

           The  Portfolio  will  invest and trade in  unlisted  over-the-counter
           options  only  with  firms  deemed  creditworthy  by  the  Investment
           Adviser. However, unlisted options are not subject to the protections
           afforded  purchasers  of  listed  options  by  the  Options  Clearing
           Corporation, which performs the obligations of its members which fail
           to perform them in connection with the purchase or sale of options.

REAL ESTATE INVESTMENT TRUSTS (REITS). REITs are pooled investment vehicles that
invest primarily in either real estate or real estate related loans.

           INVESTMENT STRATEGY.  The Portfolio may invest in REITs.

           SPECIAL  RISKS.  The value of a REIT is  affected  by  changes in the
           value of the properties owned by the REIT or securing  mortgage loans
           held by the REIT.  REITs  are  dependent  upon  cash flow from  their
           investments  to repay  financing  costs and the  ability  of a REIT's
           manager.  REITs are also subject to risks  generally  associated with
           investments in real estate.  The Portfolio will  indirectly  bear its
           proportionate share of any expenses,  including management fees, paid
           by a REIT in which it invests.

REPURCHASE AGREEMENTS.  Repurchase agreements involve the purchase of securities
by the  Portfolio  subject to the  seller's  agreement to  repurchase  them at a
mutually agreed upon date and price.

           INVESTMENT   STRATEGY.   The  Portfolio  may  enter  into  repurchase
           agreements   with   financial   institutions   such  as   banks   and
           broker-dealers  that are deemed to be  creditworthy by the Investment
           Adviser.  Although the securities  subject to a repurchase  agreement
           may have maturities  exceeding one year,  settlement of the agreement
           will never occur more than one year after the Portfolio  acquires the
           securities.

           SPECIAL RISKS. In the event of a default, the Portfolio will suffer a
           loss to the extent that the proceeds from the sale of the  underlying
           securities and other  collateral  are less than the repurchase  price
           and the  Portfolio's  costs  associated with delay and enforcement of
           the repurchase  agreement.  In addition,  in the event of bankruptcy,
           the Portfolio could suffer  additional  losses if a court  determines
           that the Portfolio's interest in the collateral is unenforceable.

SECURITIES  LENDING.  In order to generate  additional income, the Portfolio may
lend  securities  on a  short-term  basis  to  banks,  brokers-dealers  or other
qualified institutions. In exchange, the Portfolio will receive collateral equal
to at least 100% of the value of the securities loaned.

           INVESTMENT  STRATEGY.  Securities  lending may represent no more than
           one-third the value of the  Portfolio's  total assets  (including the
           loan  collateral).  Any cash collateral  received by the Portfolio in
           connection  with  these  loans  may be  invested  in U.S.  government
           securities and other liquid high-grade debt obligations.

           SPECIAL  RISKS.  The main risk when lending  portfolio  securities is
           that the  borrower  might  become  insolvent  or  refuse to honor its
           obligation  to return the  securities.  In this event,  the Portfolio
           could experience  delays in recovering its securities and may incur a
           capital  loss.  In  addition,  the  Portfolio  may  incur  a loss  in
           reinvesting the cash collateral it receives.

STRUCTURED  SECURITIES.  The value of the  principal of and/or  interest on such
securities  is  determined  by  reference  to changes  in the value of  specific
currencies,  interest rates, commodities,  indices or other financial indicators
(the "Reference") or the relative change in two or more References. The interest
rate  or the  principal  amount  payable  upon  maturity  or  redemption  may be
increased or decreased depending upon changes in the applicable Reference.

          INVESTMENT STRATEGY. The Portfolio may invest in structured securities
     to the extent consistent with its investment objective.

           SPECIAL RISKS.  The terms of some  structured  securities may provide
           that in certain  circumstances  no principal is due at maturity  and,
           therefore, the Portfolio could suffer a total loss of its investment.
           Structured  securities  may be positively or negatively  indexed,  so
           that  appreciation  of the  Reference  may  produce  an  increase  or
           decrease in the  interest  rate or value of the security at maturity.
           In  addition,  changes  in the  interest  rates  or the  value of the
           security at maturity may be a multiple of changes in the value of the
           Reference.  Consequently,  structured securities may entail a greater
           degree of market  risk than  other  types of  securities.  Structured
           securities may also be more volatile,  less liquid and more difficult
           to  accurately  price  than  less  complex  securities  due to  their
           derivative nature.

UNITED STATES GOVERNMENT  OBLIGATIONS.  These include U.S. Treasury obligations,
such as bills,  notes and bonds,  which generally  differ only in terms of their
interest rates, maturities and time of issuance.  These also include obligations
issued   or   guaranteed   by  the  U.S.   government   or  its   agencies   and
instrumentalities.  Securities  guaranteed  as to principal  and interest by the
U.S.  government,  its agencies or  instrumentalities  are deemed to include (a)
securities  for which the  payment of  principal  and  interest  is backed by an
irrevocable  letter of  credit  issued  by the U.S.  government  or an agency or
instrumentality  thereof,  and (b)  participations  in  loans  made  to  foreign
governments or their agencies that are so guaranteed.

          INVESTMENT  STRATEGY.  To the extent  consistent  with its  investment
     objective,  the  Portfolio  may  invest  in  a  variety  of  U.S.  Treasury
     obligations and also may invest in obligations  issued or guaranteed by the
     U.S. government or its agencies and instrumentalities.

           SPECIAL RISKS.  Not all U.S.  government  obligations  carry the same
           credit  support.  Some,  such as  those  of the  Government  National
           Mortgage  Association  ("GNMA"),  are supported by the full faith and
           credit of the United  States  Treasury.  Other  obligations,  such as
           those of the Federal Home Loan Banks,  are  supported by the right of
           the issuer to borrow  from the United  States  Treasury;  and others,
           such as those  issued by the Federal  National  Mortgage  Association
           ("FNMA"),  are supported by the  discretionary  authority of the U.S.
           government  to purchase  the agency's  obligations.  Still others are
           supported only by the credit of the instrumentality. No assurance can
           be given that the U.S.  government would provide financial support to
           its agencies or  instrumentalities if it is not obligated to do so by
           law. There is no assurance that these  commitments will be undertaken
           or complied with in the future. In addition, the secondary market for
           certain  participations in loans made to foreign governments or their
           agencies may be limited.

VARIABLE AND FLOATING RATE  INSTRUMENTS.  Variable and floating rate instruments
have interest rates that are  periodically  adjusted  either at set intervals or
that  float  at  a  margin  above  a  generally  recognized  index  rate.  These
instruments  include  long-term  variable  and  floating  rate bonds  (sometimes
referred to as "Put Bonds") where the Portfolio  obtains at the time of purchase
the  right  to put the  bond  back to the  issuer  or a third  party at par at a
specified date.

           INVESTMENT  STRATEGY.  The  Portfolio may invest in rated and unrated
           variable and floating rate instruments to the extent  consistent with
           its investment objective. Unrated instruments may be purchased by the
           Portfolio if they are determined by the  Investment  Adviser to be of
           comparable quality to rated instruments  eligible for purchase by the
           Portfolio.

           SPECIAL RISKS.  The market values of inverse  floaters are subject to
           greater  volatility than other variable and floating rate instruments
           due to their higher  degree of leverage.  Because  there is no active
           secondary market for certain variable and floating rate  instruments,
           they may be more  difficult  to sell if the  issuer  defaults  on its
           payment  obligations  or during  periods  when the  Portfolio  is not
           entitled to exercise its demand  rights.  As a result,  the Portfolio
           could suffer a loss with respect to these instruments.

          WARRANTS.  A warrant  represents the right to purchase a security at a
     predetermined price for a specified period of time.

           INVESTMENT  STRATEGY.  The  Portfolio  may invest up to 5% of its net
           assets at the time of purchase in warrants  and similar  rights.  The
           Portfolio  may also  purchase  bonds that are  issued in tandem  with
           warrants.

           SPECIAL RISKS. Warrants are derivative instruments that present
               risks similar to options.

WHEN-ISSUED SECURITIES, DELAYED DELIVERY TRANSACTIONS AND FORWARD COMMITMENTS. A
purchase of "when-issued"  securities refers to a transaction made conditionally
because the securities, although authorized, have not yet been issued. A delayed
delivery or forward  commitment  transaction  involves a contract to purchase or
sell  securities  for a fixed  price  at a  future  date  beyond  the  customary
settlement period.

           INVESTMENT STRATEGY. The Portfolio may purchase or sell securities on
           a when-issued, delayed delivery or forward commitment basis. Although
           the   Portfolio   will   generally   purchase   securities  in  these
           transactions  with the  intention of acquiring  the  securities,  the
           Portfolio may dispose of such  securities  prior to settlement if the
           investment management team deems it appropriate to do so.

           SPECIAL  RISKS.  Purchasing  securities  on  a  when-issued,  delayed
           delivery or forward commitment basis involves the risk that the value
           of the securities  may decrease by the time they are actually  issued
           or delivered.  Conversely,  selling  securities in these transactions
           involves  the risk that the value of the  securities  may increase by
           the time they are actually  issued or delivered.  These  transactions
           also  involve  the risk  that the  seller  may  fail to  deliver  the
           security or cash on the settlement date.

ZERO COUPON,  PAY-IN-KIND AND CAPITAL  APPRECIATION  BONDS. These are securities
issued at a  discount  from  their  face value  because  interest  payments  are
typically postponed until maturity.  Interest payments on pay-in-kind securities
are payable by the delivery of additional securities. The amount of the discount
rate varies  depending on factors  such as the time  remaining  until  maturity,
prevailing  interest  rates,  a security's  liquidity  and the  issuer's  credit
quality.  These  securities  also may take the form of debt securities that have
been stripped of their interest payments.

          INVESTMENT  STRATEGY.   The  Portfolio  may  invest  in  zero  coupon,
               pay-in-kind  and  capital   appreciation   bonds  to  the  extent
               consistent with its investment objective.

           SPECIAL  RISKS.  The market  prices of zero coupon,  pay-in-kind  and
           capital  appreciation  bonds  generally  are more  volatile  than the
           market  prices  of  interest-bearing  securities  and are  likely  to
           respond  to a greater  degree  to  changes  in  interest  rates  than
           interest-bearing  securities  having  similar  maturities  and credit
           quality. The Portfolio's investments in zero coupon,  pay-in-kind and
           capital  appreciation bonds may require the Portfolio to sell some of
           its  Portfolio  securities  to  generate  sufficient  cash to satisfy
           certain income distribution requirements.


<PAGE>


For More Information

ANNUAL/
SEMIANNUAL
REPORT

Additional  information  about the Portfolio's  investments will be available in
the  Portfolio's  annual  and  semiannual   reports  to  shareholders.   In  the
Portfolio's annual reports,  you will find a discussion of the market conditions
and  investment   strategies   that   significantly   affected  the  Portfolio's
performance during its last fiscal year.

STATEMENT OF
ADDITIONAL
INFORMATION

Additional information about the Portfolio and its policies is also available in
the  Portfolio's  Statement  of  Additional  Information  ("SAI").  The  SAI  is
incorporated  by reference into this  Prospectus (is legally  considered part of
this Prospectus).

The Portfolio's annual and semiannual reports (when they become available),  and
the SAI, are available free upon request by calling 1-800-637-1380.

To obtain other information and for shareholder inquiries:

By telephone -- Call 1-800-637-1380

By mail -- Northern Institutional Funds
          P.O. Box 75943
          Chicago, IL 60675

On the Internet -- Text-only versions of the Portfolio's documents are
available on the SEC's website at http://www.sec.gov

You may review and obtain copies of Trust documents by visiting the SEC's Public
Reference Room in Washington, D.C. You may also obtain copies of Trust documents
by sending your  request and a  duplicating  fee to the SEC's  Public  Reference
Section, Washington, D.C. 20549-6009. Information on the operation of the Public
Reference Room may be obtained by calling the SEC at 1-800-SEC-0330.

Northern
Institutional Funds

811-3605


<PAGE>


INVESTMENT ADVISER

The Northern Trust Company
50 South LaSalle Street
Chicago, IL 60675

TRANSFER AGENT
AND CUSTODIAN

The Northern Trust Company



<PAGE>


                                     PART B

                       STATEMENT OF ADDITIONAL INFORMATION

                          NORTHERN INSTITUTIONAL FUNDS

                         SMALL COMPANY GROWTH PORTFOLIO

         This  Statement of Additional  Information  dated October 20, 1999 (the
"Additional  Statement")  is not a prospectus.  Copies of the  prospectus  dated
October 20, 1999 for the Small Company  Growth  Portfolio (the  "Portfolio")  of
Northern  Institutional  Funds (the "Prospectus") may be obtained without charge
by calling 1-800-637-1380  (toll-free).  Capitalized terms not otherwise defined
have the same meaning as in the Prospectus.






<PAGE>


                                      INDEX

                                                                      Page

ADDITIONAL INVESTMENT INFORMATION.................................... 3
         Classification and History.................................. 3
         Investment Objective, Strategies and Risks.................. 3
         Investment Restrictions..................................... 16

ADDITIONAL TRUST INFORMATION......................................... 18
         Trustees and Officers....................................... 18
         Investment Adviser, Transfer Agent and Custodian............ 23
         Portfolio Transactions...................................... 26
         Portfolio Valuation......................................... 26
         Co-Administrators and Distributor........................... 26
         Shareholder Servicing Plan.................................. 28
         Counsel and Auditors........................................ 28
         In-Kind Purchases and Redemptions........................... 29

PERFORMANCE INFORMATION.............................................. 29

TAXES................................................................ 31
         General..................................................... 31
         Foreign Investors........................................... 31
         Conclusion.................................................. 32

DESCRIPTION OF SHARES................................................ 32

OTHER INFORMATION.................................................... 35

APPENDIX A........................................................... A-1

APPENDIX B........................................................... B-1

No  person  has  been  authorized  to  give  any  information  or  to  make  any
representations not contained in this Additional  Statement or in the Prospectus
in connection  with the offering made by the  Prospectus  and, if given or made,
such  information  or  representations  must not be relied  upon as having  been
authorized by the Trust or its  distributor.  The Prospectus does not constitute
an offering by the Trust or by the distributor in any jurisdiction in which such
offering may not lawfully be made.

An  investment  in the Portfolio is not a deposit of any bank and is not insured
or  guaranteed  by the  Federal  Deposit  Insurance  Corporation  or  any  other
government  agency.  An investment in the Portfolio  involves  investment risks,
including possible loss of principal.




<PAGE>


                        ADDITIONAL INVESTMENT INFORMATION

                           Classification and History

         Northern  Institutional Funds (the "Trust") is an open-end,  management
investment  company.  The  Portfolio  is  classified  as  diversified  under the
Investment Company Act of 1940, as amended (the "1940 Act").

         The Portfolio is a series of the Trust,  which was formed as a Delaware
business trust on July 1, 1997 under an Agreement and  Declaration of Trust (the
"Trust  Agreement").   The  Trust  is  the  result  of  a  reorganization  of  a
Massachusetts business trust known as The Benchmark Funds on March 31, 1998. The
Trust's name was changed from The Benchmark Funds to the Northern  Institutional
Funds on July 15,  1998.  The Trust  also  offers six fixed  income,  five money
market, one balanced and six other equity portfolios, which are not described in
this document.

                   INVESTMENT OBJECTIVE, STRATEGIES AND RISKS

         The following  supplements  the  investment  objective,  strategies and
risks of the Portfolio as set forth in the Prospectus. Except as expressly noted
below, the Portfolio's  investment objective and policies may be changed without
shareholder approval.

         Commercial Paper, Bankers'  Acceptances,  Certificates of Deposit, Time
Deposits  and Bank  Notes.  Commercial  paper  represents  short-term  unsecured
promissory  notes  issued in  bearer  form by banks or bank  holding  companies,
corporations  and finance  companies.  Certificates  of deposit  are  negotiable
certificates  issued against funds deposited in a commercial bank for a definite
period  of time  and  earning  a  specified  return.  Bankers'  acceptances  are
negotiable  drafts  or bills of  exchange,  normally  drawn  by an  importer  or
exporter  to pay for  specific  merchandise,  which  are  "accepted"  by a bank,
meaning, in effect, that the bank  unconditionally  agrees to pay the face value
of the instrument on maturity.  Fixed time deposits are bank obligations payable
at a stated  maturity  date and bearing  interest  at a fixed  rate.  Fixed time
deposits may be withdrawn on demand by the investor, but may be subject to early
withdrawal  penalties  that  vary  depending  upon  market  conditions  and  the
remaining maturity of the obligation.  There are no contractual  restrictions on
the right to transfer a  beneficial  interest in a fixed time deposit to a third
party. Bank notes and bankers' acceptances rank junior to deposit liabilities of
the bank and pari passu with other senior,  unsecured  obligations  of the bank.
Bank notes are classified as "other borrowings" on a bank's balance sheet, while
deposit notes and certificates of deposit are classified as deposits. Bank notes
are not  insured  by the  Federal  Deposit  Insurance  Corporation  or any other
insurer.  Deposit notes are insured by the Federal Deposit Insurance Corporation
only to the extent of $100,000 per depositor per bank.

         The Portfolio may invest a portion of its net assets in the obligations
of foreign  banks and  foreign  branches  of domestic  banks.  Such  obligations
include   Eurodollar   Certificates   of  Deposit   ("ECDs"),   which  are  U.S.
dollar-denominated  certificates  of deposit  issued by  offices of foreign  and
domestic  banks  located  outside the United  States;  Eurodollar  Time Deposits
("ETDs"),  which are U.S.  dollar-denominated  deposits in a foreign branch of a
U.S.  bank or a  foreign  bank;  Canadian  Time  Deposits  ("CTDs"),  which  are
essentially the same as ETDs except they are issued by Canadian offices of major
Canadian banks;  Schedule Bs, which are obligations  issued by Canadian branches
of foreign or domestic banks;  Yankee  Certificates  of Deposit  ("Yankee Cds"),
which  are U.S.  dollar-denominated  certificates  of  deposit  issued by a U.S.
branch of a foreign  bank and held in the United  States;  and  Yankee  Bankers'
Acceptances   ("Yankee  Bas"),  which  are  U.S.   dollar-denominated   bankers'
acceptances  issued by a U.S.  branch of a foreign  bank and held in the  United
States.

         Insurance Funding Agreements. An insurance funding agreement ("IFA") is
normally  a  general  obligation  of the  issuing  insurance  company  and not a
separate account. The purchase price paid for an IFA becomes part of the general
assets of the  insurance  company,  and the contract is paid from the  company's
general assets.  Generally,  IFAs are not assignable or transferable without the
permission of the issuing insurance companies, and an active secondary market in
IFAs  may  not  exist.  Therefore,  IFAs  will  be  subject  to the  Portfolio's
limitation on illiquid  investments when the Portfolio may not demand payment of
the principal amount within seven days and a reliable trading market is absent.

         Zero Coupon,  Pay-In-Kind and Capital Appreciation Bonds. To the extent
consistent  with its  investment  objective,  the  Portfolio  may invest in zero
coupon bonds,  capital  appreciation bonds and pay-in-kind  ("PIK")  securities.
Zero coupon and capital appreciation bonds are debt securities issued or sold at
a discount  from their  face  value and which do not  entitle  the holder to any
periodic payment of interest prior to maturity or a specified date. The original
issue discount  varies  depending on the time  remaining  until maturity or cash
payment date,  prevailing  interest rates, the liquidity of the security and the
perceived credit quality of the issuer.  These securities also may take the form
of debt securities that have been stripped of their unmatured  interest coupons,
the coupons  themselves or receipts or  certificates  representing  interests in
such  stripped  debt  obligations  or coupons.  The market prices of zero coupon
bonds, capital appreciation bonds and PIK securities generally are more volatile
than the market prices of interest bearing  securities and are likely to respond
to a  greater  degree  to  changes  in  interest  rates  than  interest  bearing
securities having similar maturities and credit quality.

           PIK  securities  may be debt  obligations  or  preferred  shares that
           provide the issuer with the option of paying interest or dividends on
           such  obligations  in cash or in the  form of  additional  securities
           rather than cash.  Similar to zero coupon bonds,  PIK  securities are
           designed to give an issuer  flexibility  in managing  cash flow.  PIK
           securities   that  are  debt  securities  can  either  be  senior  or
           subordinated  debt and generally  trade flat (i.e.,  without  accrued
           interest).  The  trading  price  of  PIK  debt  securities  generally
           reflects  the  market  value of the  underlying  debt  plus an amount
           representing accrued interest since the last interest payment.

         Zero  coupon  bonds,  capital  appreciation  bonds  and PIK  securities
involve the  additional  risk that,  unlike  securities  that  periodically  pay
interest  to  maturity,  the  Portfolio  will  realize no cash until a specified
future  payment  date  unless a portion of such  securities  is sold and, if the
issuer of such securities defaults, the Portfolio may obtain no return at all on
its investment.  In addition, even though such securities do not provide for the
payment of current  interest in cash, the Portfolio is  nonetheless  required to
accrue  income  on such  investments  for each  taxable  year and  generally  is
required to distribute such accrued amounts (net of deductible expenses, if any)
to avoid being subject to tax. Because no cash is generally received at the time
of the  accrual,  the  Portfolio  may be required to liquidate  other  portfolio
securities  to  obtain  sufficient  cash to  satisfy  federal  tax  distribution
requirements applicable to the Portfolio.

         Repurchase  Agreements.  The Portfolio may agree to purchase  portfolio
securities  from  financial  institutions  subject to the seller's  agreement to
repurchase  them  at  a  mutually  agreed  upon  date  and  price   ("repurchase
agreements").  Repurchase  agreements  are  considered  to be  loans  under  the
Investment Company Act of 1940 (the "1940 Act"). Although the securities subject
to a repurchase agreement may bear maturities exceeding one year, settlement for
the repurchase  agreement will never be more than one year after the Portfolio's
acquisition  of the  securities  and normally will be within a shorter period of
time. Securities subject to repurchase agreements are held either by the Trust's
custodian  or  subcustodian  (if  any),  or  in  the  Federal   Reserve/Treasury
Book-Entry System.  The seller under a repurchase  agreement will be required to
maintain  the value of the  securities  subject  to the  agreement  in an amount
exceeding the repurchase  price  (including  accrued  interest).  Default by the
seller would, however,  expose the Portfolio to possible loss because of adverse
market  action or delay in connection  with the  disposition  of the  underlying
obligations.

         Reverse  Repurchase  Agreements.  The  Portfolio  may  borrow  funds by
selling  portfolio  securities  to  financial  institutions  such as  banks  and
broker/dealers  and agreeing to repurchase them at a mutually specified date and
price ("reverse repurchase  agreements").  The Portfolio may use the proceeds of
reverse repurchase  agreements to purchase other securities either maturing,  or
under  an  agreement  to  resell,  on a date  simultaneous  with or prior to the
expiration of the reverse repurchase  agreement.  Reverse repurchase  agreements
are  considered  to  be  borrowings  under  the  1940  Act.  Reverse  repurchase
agreements  involve the risk that the market value of the securities sold by the
Portfolio  may  decline  below the  repurchase  price.  The  Portfolio  will pay
interest on amounts obtained pursuant to a reverse repurchase  agreement.  While
reverse  repurchase  agreements  are  outstanding,  the Portfolio will segregate
liquid assets in an amount at least equal to the market value of the securities,
plus accrued interest, subject to the agreement.

         Variable and Floating  Rate  Instruments.  With respect to the variable
and floating rate instruments that may be acquired by the Portfolio as described
in the Prospectus,  the Investment Adviser will consider the earning power, cash
flows  and  other  liquidity  ratios  of the  issuers  and  guarantors  of  such
instruments and, if the instruments are subject to demand features, will monitor
their  financial  status and ability to meet payment on demand.  In  determining
weighted average  portfolio  maturity,  an instrument may, subject to applicable
Securities  and Exchange  Commission  ("SEC")  regulations,  be deemed to have a
maturity  shorter than its nominal  maturity based on the period remaining until
the next interest rate  adjustment or the time the Portfolio can recover payment
of principal as specified in the  instrument.  Where  necessary to ensure that a
variable or floating rate  instrument is of the minimum  required credit quality
for  the  Portfolio,  the  issuer's  obligation  to  pay  the  principal  of the
instrument  will be backed by an  unconditional  bank  letter or line of credit,
guarantee or commitment to lend.

         The  Portfolio  may deem the  maturity of variable  and  floating  rate
instruments to be less than their stated  maturities based on their variable and
floating rate features and/or their put features.  Unrated variable and floating
rate  instruments  will  be  determined  by  the  Investment  Adviser  to  be of
comparable  quality at the time of  purchase to rated  instruments  which may be
purchased by the Portfolio.

         Variable and floating rate instruments  including inverse floaters held
by the  Portfolio  will be subject to the  Portfolio's  limitation  on  illiquid
investments  when the Portfolio may not demand  payment of the principal  amount
within seven days absent a reliable trading market.

         Forward  Commitments,   When-Issued   Securities  and  Delayed-Delivery
Transactions.  The Portfolio may purchase  securities on a when-issued  basis or
purchase or sell securities on a forward  commitment  (sometimes  called delayed
delivery)  basis.  These  transactions  involve a commitment by the Portfolio to
purchase  or sell  securities  at a future  date.  The  price of the  underlying
securities  (usually  expressed  in  terms  of  yield)  and the  date  when  the
securities will be delivered and paid for (the settlement date) are fixed at the
time the transaction is negotiated. When-issued purchases and forward commitment
transactions are normally negotiated directly with the other party.

         The  Portfolio  will  purchase  securities  on a  when-issued  basis or
purchase  or sell  securities  on a  forward  commitment  basis  only  with  the
intention of completing the transaction  and actually  purchasing or selling the
securities. If deemed advisable as a matter of investment strategy, however, the
Portfolio may dispose of or negotiate a commitment  after  entering into it. The
Portfolio  also may sell  securities it has  committed to purchase  before those
securities are delivered to the Portfolio on the settlement date.

         When   the   Portfolio   purchases   securities   on   a   when-issued,
delayed-delivery  or forward  commitment  basis,  the Portfolio  will  segregate
liquid assets having a value (determined  daily) at least equal to the amount of
the Portfolio's  purchase  commitments  until three days prior to the settlement
date, or will  otherwise  cover its position.  These  procedures are designed to
ensure that the Portfolio will maintain  sufficient assets at all times to cover
its  obligations   under   when-issued   purchases,   forward   commitments  and
delayed-delivery  transactions.  For  purposes of  determining  the  Portfolio's
average dollar-weighted maturity, the maturity of when-issued,  delayed-delivery
or forward commitment securities will be calculated from the commitment date.

         United  States  Government  Obligations.  Examples of the types of U.S.
Government  obligations  that may be  acquired  by the  Portfolio  include  U.S.
Treasury Bills, Treasury Notes and Treasury Bonds and the obligations of Federal
Home Loan Banks,  Federal Farm Credit  Banks,  Federal  Land Banks,  the Federal
Housing Administration,  Farmers Home Administration,  Export-Import Bank of the
United  States,  Small  Business   Administration,   Federal  National  Mortgage
Association ("FNMA"), Government National Mortgage Association ("GNMA"), General
Services  Administration,  Central  Bank for  Cooperatives,  Federal  Home  Loan
Mortgage Corporation  ("FHLMC"),  Federal Intermediate Credit Banks and Maritime
Administration.

         Supranational Bank Obligations. The Portfolio may invest in obligations
of  supranational   banks.   Supranational   banks  are  international   banking
institutions  designed or supported by national  governments to promote economic
reconstruction, development or trade among nations (e.g., the International Bank
for Reconstruction and Development).  Obligations of supranational  banks may be
supported by appropriated  but unpaid  commitments of their member countries and
there is no assurance  that these  commitments  will be undertaken or met in the
future.

         Stripped Obligations. The Treasury Department has facilitated transfers
of  ownership  of  zero  coupon  securities  by  accounting  separately  for the
beneficial  ownership of particular  interest  coupon and principal  payments on
Treasury  securities  through  the  Federal  Reserve  book-entry  record-keeping
system. The Federal Reserve program as established by the Treasury Department is
known as "STRIPS" or "Separate  Trading of Registered  Interest and Principal of
Securities."  The  Portfolio  may purchase  securities  registered in the STRIPS
program.  Under the STRIPS program, the Portfolio is able to have its beneficial
ownership  of  zero  coupon  securities  recorded  directly  in  the  book-entry
record-keeping  system in lieu of having to hold certificates or other evidences
of ownership of the underlying U.S. Treasury securities.

         In addition,  the Portfolio may acquire U.S. Government obligations and
their unmatured interest coupons that have been separated  ("stripped") by their
holder,  typically  a  custodian  bank  or  investment  brokerage  firm.  Having
separated  the  interest  coupons  from  the  underlying  principal  of the U.S.
Government  obligations,  the holder  will  resell the  stripped  securities  in
custodial receipt programs with a number of different names, including "Treasury
Income  Growth  Receipts"  ("TIGRs")  and  "Certificate  of Accrual on  Treasury
Securities"  ("CATS").  The  stripped  coupons  are  sold  separately  from  the
underlying principal, which is usually sold at a deep discount because the buyer
receives  only the right to receive a future  fixed  payment on the security and
does not receive any rights to periodic interest (cash) payments. The underlying
U.S.  Treasury  bonds and notes  themselves  are held in book-entry  form at the
Federal Reserve Bank or, in the case of bearer  securities  (i.e.,  unregistered
securities  which are  ostensibly  owned by the bearer or  holder),  in trust on
behalf of the owners. Counsel to the underwriters of these certificates or other
evidences of ownership of U.S.  Treasury  securities  have stated that, in their
opinion,  purchasers of the stripped  securities  most likely will be deemed the
beneficial holders of the underlying U.S. Government obligations for federal tax
purposes.  The  Trust  is  unaware  of  any  binding  legislative,  judicial  or
administrative authority on this issue.

         Other  types  of  stripped  securities  that  may be  purchased  by the
Portfolio include stripped mortgage-backed securities ("SMBS"). SMBS are usually
structured  with two or more classes that receive  different  proportions of the
interest and principal distributions from a pool of mortgage-backed obligations.
A common type of SMBS will have one class  receiving all of the interest,  while
the other class receives all of the principal.  However, in some instances,  one
class will  receive some of the  interest  and most of the  principal  while the
other  class  will  receive  most  of the  interest  and  the  remainder  of the
principal.  If the underlying  obligations  experience  greater than anticipated
prepayments  of  principal,  the  Portfolio may fail to fully recoup its initial
investment  in  these  securities.  The  market  value of the  class  consisting
entirely of principal  payments  generally is extremely  volatile in response to
changes in interest  rates.  The yields on a class of SMBS that  receives all or
most of the interest are generally higher than prevailing market yields on other
mortgage-backed  obligations  because their cash flow patterns are also volatile
and there is a risk that the initial investment will not be fully recouped. SMBS
issued by the U.S.  Government (or a U.S.  Government agency or instrumentality)
may be considered  liquid under  guidelines  established by the Trust's Board of
Trustees if they can be disposed of promptly in the ordinary  course of business
at a value  reasonably  close to that used in the  calculation  of the net asset
value per share.

         Asset-Backed Securities. To the extent described in the Prospectus, the
Portfolio may purchase asset-backed  securities,  which are securities backed by
mortgages,  installment  contracts,  credit card  receivables  or other  assets.
Asset-backed  securities  represent  interests  in  "pools"  of  assets in which
payments of both interest and principal on the securities are made periodically,
thus in effect "passing through" such payments made by the individual  borrowers
on the assets that underlie the  securities,  net of any fees paid to the issuer
or guarantor of the  securities.  The average  life of  asset-backed  securities
varies with the maturities of the underlying  instruments,  and the average life
of a mortgage-backed  instrument,  in particular,  is likely to be substantially
less than the original  maturity of the mortgage pools underlying the securities
as a result of mortgage prepayments. For this and other reasons, an asset-backed
security's stated maturity may be shortened, and the security's total return may
be difficult to predict precisely.

         If an  asset-backed  security is purchased  at a premium,  a prepayment
rate that is  faster  than  expected  will  reduce  yield to  maturity,  while a
prepayment  rate that is slower than expected  will have the opposite  effect of
increasing  yield  to  maturity.  Conversely,  if an  asset-backed  security  is
purchased at a discount,  faster than expected prepayments will increase,  while
slower than expected prepayments will decrease, yield to maturity.

         Prepayments on asset-backed  securities generally increase with falling
interest rates and decrease with rising interest rates; furthermore,  prepayment
rates are  influenced by a variety of economic and social  factors.  In general,
the collateral  supporting  non-mortgage  asset-backed  securities is of shorter
maturity  than  mortgage  loans  and is less  likely to  experience  substantial
prepayments.

         Asset-backed   securities   acquired  by  the   Portfolio  may  include
collateralized  mortgage obligations ("CMOs") issued by private companies.  CMOs
provide  the  holder  with a  specified  interest  in the cash flow of a pool of
underlying  mortgages  or  other  mortgage-backed  securities.  Issuers  of CMOs
ordinarily  elect to be  taxed as  pass-through  entities  known as real  estate
mortgage  investment conduits  ("REMICs").  CMOs are issued in multiple classes,
each with a specified fixed or floating  interest rate and a final  distribution
date.  The relative  payment rights of the various CMO classes may be structured
in a variety of ways. The Portfolio will not purchase  "residual" CMO interests,
which normally exhibit greater price volatility.

         There are a number of  important  differences  among the  agencies  and
instrumentalities of the U.S. Government that issue mortgage-related  securities
and among the securities that they issue. Mortgage-related securities guaranteed
by GNMA include GNMA Mortgage  Pass-Through  Certificates (also known as "Ginnie
Maes"),  which are guaranteed as to the timely payment of principal and interest
by GNMA and backed by the full faith and credit of the United States.  GNMA is a
wholly-owned U.S.  Government  corporation  within the Department of Housing and
Urban Development. GNMA certificates also are supported by the authority of GNMA
to borrow funds from the U.S.  Treasury to make  payments  under its  guarantee.
Mortgage-backed  securities  issued by FNMA  include  FNMA  Guaranteed  Mortgage
Pass-Through  Certificates  (also known as "Fannie Maes"),  which are solely the
obligations  of FNMA and are not  backed by or  entitled  to the full  faith and
credit of the United  States,  but are  supported  by the right of the issuer to
borrow from the  Treasury.  FNMA is a  government-sponsored  organization  owned
entirely  by  private  stockholders.  Fannie  Maes are  guaranteed  as to timely
payment of the  principal  and  interest  by FNMA.  Mortgage-related  securities
issued by the Federal Home Loan  Mortgage  Corporation  ("FHLMC")  include FHLMC
Mortgage  Participation  Certificates  (also known as "Freddie  Macs" or "PCs").
FHLMC is a corporate  instrumentality of the United States,  created pursuant to
an Act of Congress,  which is owned entirely by Federal Home Loan Banks. Freddie
Macs are not guaranteed and do not constitute a debt or obligation of the United
States or of any  Federal  Home Loan Bank.  Freddie  Macs  entitle the holder to
timely  payment of interest,  which is  guaranteed  by FHLMC.  FHLMC  guarantees
either  ultimate  collection or timely payment of all principal  payments on the
underlying  mortgage  loans.  When FHLMC does not  guarantee  timely  payment of
principal,  FHLMC  may remit the  amount  due on  account  of its  guarantee  of
ultimate  payment  of  principal  at any time  after  default  on an  underlying
mortgage, but in no event later than one year after it becomes payable.

         Non-mortgage asset-backed securities involve certain risks that are not
presented by mortgage-backed securities. Primarily, these securities do not have
the benefit of the same security interest in the underlying  collateral.  Credit
card  receivables  are  generally  unsecured and the debtors are entitled to the
protection of a number of state and federal  consumer credit laws, many of which
have  given  debtors  the right to set off  certain  amounts  owed on the credit
cards, thereby reducing the balance due. Most issuers of automobile  receivables
permit the servicers to retain possession of the underlying obligations.  If the
servicer were to sell these  obligations to another party,  there is a risk that
the purchaser  would acquire an interest  superior to that of the holders of the
related  automobile  receivables.  In  addition,  because of the large number of
vehicles involved in a typical issuance and technical  requirements  under state
laws, the trustee for the holders of the automobile  receivables may not have an
effective security interest in all of the obligations  backing such receivables.
Therefore,  there is a possibility that recoveries on repossessed collateral may
not, in some cases, be able to support payments on these securities.

         Warrants. The Portfolio may purchase warrants and similar rights, which
are privileges  issued by  corporations  enabling the owners to subscribe to and
purchase a specified  number of shares of the  corporation at a specified  price
during a specified  period of time.  The prices of  warrants do not  necessarily
correlate  with the prices of the  underlying  shares.  The purchase of warrants
involves the risk that the Portfolio  could lose the purchase value of a warrant
if the right to subscribe to  additional  shares is not  exercised  prior to the
warrant's expiration.  Also, the purchase of warrants involves the risk that the
effective  price paid for the  warrant  added to the  subscription  price of the
related security may exceed the value of the subscribed  security's market price
such as when there is no movement in the level of the underlying security.

         Foreign Securities. The Portfolio may invest a portion of its assets in
the securities of foreign issuers,  including eurodollar convertible securities,
which are fixed income  securities  that are issued in U.S.  dollars outside the
United States and are convertible into or exchangeable for equity  securities of
the same or a different issuer.

         Investment in foreign securities  involves special risks. These include
market risk,  interest  rate risk and the risks of investing  in  securities  of
foreign issuers and of companies whose securities are principally traded outside
the United States and in investments  denominated in foreign currencies.  Market
risk involves the possibility  that stock prices will decline over short or even
extended  periods.  The stock  markets  tend to be  cyclical,  with  periods  of
generally rising prices and periods of generally declining prices.  These cycles
will affect the value of the  Portfolio to the extent that it invests in foreign
stocks.  The holdings of the  Portfolio,  to the extent that it invests in fixed
income  securities,  will be  sensitive  to  changes in  interest  rates and the
interest rate  environment.  Generally,  the prices of bonds and debt securities
fluctuate inversely with interest rate changes. In addition,  the performance of
investments in securities  denominated in a foreign  currency will depend on the
strength of the foreign  currency  against the U.S. dollar and the interest rate
environment in the country issuing the currency. Absent other events which could
otherwise  affect  the  value of a  foreign  security  (such as a change  in the
political  climate or an issuer's credit quality),  appreciation in the value of
the foreign  currency  generally  can be  expected  to  increase  the value of a
foreign  currency-denominated  security  in  terms  of U.S.  dollars.  A rise in
foreign interest rates or decline in the value of the foreign currency  relative
to the U.S.  dollar  generally can be expected to depress the value of a foreign
currency-denominated security.

         There  are other  risks and costs  involved  in  investing  in  foreign
securities  which  are in  addition  to the usual  risks  inherent  in  domestic
investments.  Investment  in  foreign  securities  involves  higher  costs  than
investment in U.S. securities, including higher transaction and custody costs as
well as the  imposition  of  additional  taxes by foreign  governments.  Foreign
investments  also involve risks  associated with the level of currency  exchange
rates,  less  complete  financial  information  about the  issuers,  less market
liquidity,  more market volatility and political  instability.  Future political
and economic  developments,  the possible  imposition  of  withholding  taxes on
dividend income,  the possible seizure or  nationalization  of foreign holdings,
the  possible  establishment  of  exchange  controls,  or the  adoption of other
governmental  restrictions  might  adversely  affect an  investment  in  foreign
securities.  Additionally,  foreign banks and foreign branches of domestic banks
are subject to less stringent reserve requirements, and to different accounting,
auditing and recordkeeping requirements.

         The Portfolio may invest in foreign debt,  including the  securities of
foreign governments. Several risks exist concerning such investments,  including
the risk that  foreign  governments  may default on their  obligations,  may not
respect the  integrity of such debt,  may attempt to  renegotiate  the debt at a
lower rate, and may not honor investments by United States entities or citizens.

         To the extent consistent with its investment  objective,  the Portfolio
may also invest in obligations of the International  Bank for Reconstruction and
Development  (also known as the World Bank) which are  supported by  subscribed,
but unpaid,  commitments  of its member  countries.  There is no assurance  that
these commitments will be undertaken or complied with in the future.

         The end of the Cold War, the reunification of Germany, the accession of
new Western European members to the European Economic and Monetary Union and the
aspirations of Eastern  European  states to join and other  political and social
events in  Europe  have  caused  considerable  economic,  social  and  political
dislocation.  In addition, events in the Japanese economy, as well as social and
political  developments  there have affected  Japanese  securities  and currency
markets,  and have  disrupted  the  relationship  of the Japanese yen with other
currencies  and with the U.S.  dollar.  Future  political,  economic  and social
developments in Japan and in the  Asia/Pacific  regional context can be expected
to produce continuing effects on securities and currency markets.

         Although the Portfolio may invest in securities  denominated in foreign
currencies,  its  portfolio  securities  and  other  assets  are  valued in U.S.
dollars.  Currency exchange rates may fluctuate significantly over short periods
of time causing, together with other factors, the Portfolio's net asset value to
fluctuate as well. Currency exchange rates can be affected  unpredictably by the
intervention  or the  failure to  intervene  by U.S. or foreign  governments  or
central banks, or by currency controls or political  developments in the U.S. or
abroad. To the extent that the Portfolio's total assets, adjusted to reflect the
Portfolio's  net position  after  giving  effect to currency  transactions,  are
denominated in the currencies of foreign  countries,  the Portfolio will be more
susceptible to the risk of adverse  economic and political  developments  within
those  countries.  The  Portfolio is also subject to the possible  imposition of
exchange control regulations or freezes on the convertibility of currency.

     Dividends  and  interest  payable  on  the  Portfolio's  foreign  portfolio
securities may be subject to foreign withholding taxes. To the extent such taxes
are not offset by credits or deductions  allowed to investors under U.S. federal
income tax law, they may reduce the net return to the shareholders. See "Taxes."

     American  Depository  Receipts.  The Portfolio can invest in ADRs. ADRs are
receipts  typically  issued by a United States bank or trust company  evidencing
ownership of the  underlying  foreign  securities  and are  denominated  in U.S.
dollars. Some institutions issuing ADRs may not be sponsored by the issuer.

         A  non-sponsored  depository  may  not  provide  the  same  shareholder
information  that a  sponsored  depository  is  required  to  provide  under its
contractual arrangement with the issuer.

     European  Depository  Receipts.  The  Portfolio can also invest in EDRs and
GDRs.  EDRs and GDRs are  receipts  issued by a non-U.S.  financial  institution
evidencing  ownership of underlying  foreign or U.S.  securities and are usually
denominated in foreign  currencies.  EDRs and GDRs may not be denominated in the
same currency as the securities  they  represent.  Generally,  EDRs and GDRs are
designed for use in the foreign securities markets.

         Foreign Currency  Transactions.  In order to protect against a possible
loss on investments  resulting from a decline or  appreciation in the value of a
particular  foreign currency against the U.S. dollar or another foreign currency
or for other reasons, the Portfolio is authorized to enter into forward currency
exchange contracts.  These contracts involve an obligation to purchase or sell a
specified  currency at a future date at a price set at the time of the contract.
Forward  currency  contracts  do not  eliminate  fluctuations  in the  values of
portfolio  securities  but rather may allow the Portfolio to establish a rate of
exchange for a future point in time.

         When  entering  into a contract for the purchase or sale of a security,
the Portfolio may enter into a forward foreign  currency  exchange  contract for
the amount of the purchase or sale price to protect against variations,  between
the date the security is purchased or sold and the date on which payment is made
or received, in the value of the foreign currency relative to the U.S. dollar or
other foreign currency.

         In addition,  when the Investment Adviser anticipates that a particular
foreign currency may decline substantially  relative to the U.S. dollar or other
leading  currencies,  in order to reduce risk,  the  Portfolio  may enter into a
forward  contract to sell,  for a fixed amount,  the amount of foreign  currency
approximating the value of some or all of the Portfolio's securities denominated
in such foreign currency.  Similarly,  when the securities held by the Portfolio
create a short  position in a foreign  currency,  the Portfolio may enter into a
forward  contract  to buy,  for a fixed  amount,  an amount of foreign  currency
approximating  the short  position.  The  Portfolio's net long and short foreign
currency  exposure  will not exceed its total asset  value.  With respect to any
forward foreign  currency  contract,  it will not generally be possible to match
precisely the amount  covered by that  contract and the value of the  securities
involved  due to the  changes in the values of such  securities  resulting  from
market  movements  between the date the forward contract is entered into and the
date it  matures.  While  forward  contracts  may offer  protection  from losses
resulting  from declines or  appreciation  in the value of a particular  foreign
currency, they also limit potential gains which might result from changes in the
value of such currency.  The Portfolio will also incur costs in connection  with
forward  foreign  currency   exchange   contracts  and  conversions  of  foreign
currencies and U.S. dollars.

         Liquid assets equal to the amount of the Portfolio's  assets that could
be required to consummate  forward  contracts  will be segregated  except to the
extent the contracts  are otherwise  "covered."  The  segregated  assets will be
valued at market  or fair  value.  If the  market or fair  value of such  assets
declines, additional liquid assets will be segregated daily so that the value of
the  segregated  assets  will  equal  the  amount  of  such  commitments  by the
Portfolio.  A forward  contract to sell a foreign  currency is  "covered" if the
Portfolio  owns  the  currency  (or  securities  denominated  in  the  currency)
underlying the contract, or holds a forward contract (or call option) permitting
the Portfolio to buy the same currency at a price that is (i) no higher than the
Portfolio's  price to sell the  currency or (ii)  greater  than the  Portfolio's
price to sell the currency  provided the Portfolio  segregates  liquid assets in
the amount of the difference.  A forward  contract to buy a foreign  currency is
"covered" if the Portfolio holds a forward  contract (or put option)  permitting
the  Portfolio  to sell the same  currency  at a price that is (i) as high as or
higher  than the  Portfolio's  price to buy the  currency or (ii) lower than the
Portfolio's price to buy the currency  provided the Portfolio  segregates liquid
assets in the amount of the difference.

         Options.  The  Portfolio  may buy put options and buy call  options and
write  covered  call and  secured  put  options.  Such  options  may  relate  to
particular  securities,  foreign  and  domestic  securities  indices,  financial
instruments or foreign currencies, and may or may not be listed on a domestic or
foreign securities exchange and may or may not be issued by the Options Clearing
Corporation.  A call option for a particular security gives the purchaser of the
option the right to buy, and a writer the  obligation  to sell,  the  underlying
security at the stated  exercise  price prior to the  expiration  of the option,
regardless of the market price of the  security.  The premium paid to the writer
is in consideration for undertaking the obligation under the option contract.  A
put option for a particular  security  gives the purchaser the right to sell the
security  at the  stated  exercise  price  prior to the  expiration  date of the
option,  regardless of the market price of the security.  Options on indices and
yield curve options  provide the holder with the right to make or receive a cash
settlement upon exercise of the option. With respect to options on indices,  the
amount of the settlement will equal the difference  between the closing price of
the index at the time of exercise and the exercise price of the option expressed
in dollars, times a specified multiple. With respect to yield curve options, the
amount  of the  settlement  will  equal the  difference  between  the  yields of
designated securities.

         Options trading is a highly specialized  activity which entails greater
than ordinary  investment risk. Options may be more volatile than the underlying
instruments and, therefore,  on a percentage basis, an investment in options may
be  subject  to  greater  fluctuation  than  an  investment  in  the  underlying
instruments themselves.

         The  Portfolio  will write call options only if they are  "covered." In
the case of a call option on a security or currency,  the option is "covered" if
the Portfolio  owns the  instrument  underlying  the call or has an absolute and
immediate right to acquire that instrument without additional cash consideration
(or, if additional cash consideration is required,  liquid assets in such amount
are segregated)  upon conversion or exchange of other securities held by it. For
a call option on an index, the option is covered if the Portfolio maintains with
its  custodian  securities  comprising  the index or liquid  assets equal to the
contract  value. A call option is also covered if the Portfolio  holds a call on
the same instrument or index as the call written where the exercise price of the
call held is (i) equal to or less than the exercise  price of the call  written,
or (ii)  greater  than  the  exercise  price of the call  written  provided  the
Portfolio  segregates  liquid  assets  in  the  amount  of the  difference.  The
Portfolio will write put options only if they are "secured" by segregated liquid
assets in an amount not less than the exercise  price of the option at all times
during the option period.

         The Portfolio's  obligation to sell an instrument  subject to a covered
call option written by it, or to purchase an instrument subject to a secured put
option  written by it, may be  terminated  prior to the  expiration  date of the
option by the Portfolio's execution of a closing purchase transaction,  which is
effected by purchasing  on an exchange an option of the same series (i.e.,  same
underlying  instrument,  exercise  price  and  expiration  date)  as the  option
previously  written.  Such a  purchase  does not result in the  ownership  of an
option. A closing purchase  transaction will ordinarily be effected to realize a
profit on an outstanding option, to prevent an underlying  instrument from being
called, to permit the sale of the underlying instrument or to permit the writing
of a new option containing  different terms on such underlying  instrument.  The
cost of such a liquidation  purchase plus transaction  costs may be greater than
the premium received upon the original option, in which event the Portfolio will
have  incurred a loss in the  transaction.  There is no assurance  that a liquid
secondary market will exist for any particular option. An option writer,  unable
to  effect  a  closing  purchase  transaction,  will  not be able  to  sell  the
underlying  instrument  (in the case of a covered call option) or liquidate  the
segregated assets (in the case of a secured put option) until the option expires
or the optioned  instrument  or currency is  delivered  upon  exercise  with the
result  that the  writer in such  circumstances  will be  subject to the risk of
market decline or appreciation in the instrument during such period.

         When the  Portfolio  purchases  an option,  the  premium  paid by it is
recorded as an asset of the Portfolio.  When the Portfolio writes an option,  an
amount equal to the net premium (the  premium less the  commission)  received by
the Portfolio is included in the liability section of the Portfolio's  statement
of assets  and  liabilities  as a deferred  credit.  The amount of this asset or
deferred  credit will be  subsequently  marked-to-market  to reflect the current
value of the option purchased or written. The current value of the traded option
is the last sale price or, in the absence of a sale,  the current bid price.  If
an option purchased by the Portfolio expires unexercised, the Portfolio realizes
a loss equal to the premium paid.  If the  Portfolio  enters into a closing sale
transaction  on an option  purchased by it, the Portfolio will realize a gain if
the premium  received by the Portfolio on the closing  transaction  is more than
the premium paid to purchase the option,  or a loss if it is less.  If an option
written by the Portfolio  expires on the  stipulated  expiration  date or if the
Portfolio enters into a closing purchase transaction, it will realize a gain (or
loss if the cost of a  closing  purchase  transaction  exceeds  the net  premium
received when the option is sold) and the deferred credit related to such option
will be  eliminated.  If an option  written by the Portfolio is  exercised,  the
proceeds of the sale will be  increased by the net premium  originally  received
and the Portfolio will realize a gain or loss.

         There are several risks  associated with  transactions in options.  For
example, there are significant differences between the securities,  currency and
options  markets  that could result in an imperfect  correlation  between  these
markets, causing a given transaction not to achieve its objectives. In addition,
a   liquid   secondary   market   for   particular   options,   whether   traded
over-the-counter  or on an exchange may be absent for reasons  which include the
following:  there may be  insufficient  trading  interest  in  certain  options;
restrictions  may be imposed by an exchange on opening  transactions  or closing
transactions or both;  trading halts,  suspensions or other  restrictions may be
imposed with respect to  particular  classes or series of options or  underlying
securities  or  currencies;  unusual or unforeseen  circumstances  may interrupt
normal  operations on an exchange;  the facilities of an exchange or the Options
Clearing  Corporation may not at all times be adequate to handle current trading
value; or one or more exchanges could, for economic or other reasons,  decide or
be  compelled  at some future date to  discontinue  the trading of options (or a
particular  class or series of options),  in which event the secondary market on
that  exchange  (or in that class or series of  options)  would  cease to exist,
although  outstanding  options  that had been  issued  by the  Options  Clearing
Corporation  as a  result  of  trades  on that  exchange  would  continue  to be
exercisable in accordance with their terms.

         Futures  Contracts and Related Options.  The Portfolio may purchase and
sell futures contracts and may purchase and sell call and put options on futures
contracts for hedging  purposes,  for speculative  purposes (to seek to increase
total return), or for liquidity management  purposes.  When used as a hedge, the
Portfolio  may sell a  futures  contract  in order to offset a  decrease  in the
market value of its  portfolio  securities  that might  otherwise  result from a
market decline or currency exchange fluctuations. The Portfolio may do so either
to hedge the value of its  portfolio  of  securities  as  whole,  or to  protect
against  declines,  occurring prior to sales of securities,  in the value of the
securities to be sold. Conversely, the Portfolio may purchase a futures contract
as a hedge  in  anticipation  of  purchases  of  securities.  In  addition,  the
Portfolio  may  utilize  futures  contracts  in  anticipation  of changes in the
composition  of its portfolio  holdings.  For a detailed  description of futures
contracts and related options, see Appendix B to this Additional Statement.

         Participation  in foreign  futures  and  foreign  options  transactions
involves  the  execution  and clearing of trades on or subject to the rules of a
foreign  board of  trade.  Neither  the  National  Futures  Association  nor any
domestic exchange regulates activities of any foreign boards of trade, including
the execution, delivery and clearing of transactions, or has the power to compel
enforcement of the rules of a foreign board of trade or any  applicable  foreign
law. This is true even if the exchange is formally  linked to a domestic  market
so that a position  taken on the market may be liquidated  by a  transaction  on
another market.  Moreover,  such laws or regulations  will vary depending on the
foreign  country in which the  foreign  futures or foreign  options  transaction
occurs. For these reasons,  persons who trade foreign futures or foreign options
contracts may not be afforded certain of the protective measures provided by the
Commodity  Exchange Act, the Commodity  Futures  Trading  Commission's  ("CFTC")
regulations and the rules of the National  Futures  Association and any domestic
exchange, including the right to use reparations proceedings before the CFTC and
arbitration proceedings provided them by the National Futures Association or any
domestic futures exchange. In particular, the Portfolio's investments in foreign
futures or foreign options transactions may not be provided the same protections
in respect of transactions on United States futures exchanges.  In addition, the
price of any foreign futures or foreign  options  contract and,  therefore,  the
potential profit and loss thereon may be affected by any variance in the foreign
exchange rate between the time an order is placed and the time it is liquidated,
offset or exercised. For a detailed description of futures contracts and related
options, see Appendix B to this Additional Statement.

         In connection  with the Portfolio's  position in a futures  contract or
related  option,  the Portfolio will  segregate  liquid assets or will otherwise
cover its position in accordance with applicable SEC requirements.

         The Trust  intends  to comply  with the  regulations  of the  Commodity
Futures  Trading  Commission  exempting the  Portfolio  from  registration  as a
"commodity pool operator."

         Real Estate Investment  Trusts. The Portfolio may invest in equity real
estate investment  trusts ("REITs").  REITs pool investors' funds for investment
primarily in commercial real estate properties. Investments in REITs may subject
the Portfolio to certain risks. REITs may be affected by changes in the value of
the  underlying  property  owned  by  the  trusts.   REITs  are  dependent  upon
specialized  management  skill,  may not be  diversified  and are subject to the
risks  of  financing  projects.  REITs  are also  subject  to  heavy  cash  flow
dependency,  defaults by borrowers,  self  liquidation  and the  possibility  of
failing to qualify for the beneficial tax treatment available to REITs under the
Internal  Revenue Code of 1986, as amended,  and to maintain  exemption from the
1940 Act. As a shareholder in a REIT, the Portfolio would bear, along with other
shareholders,  its pro rata  portion of the  REIT's  operating  expenses.  These
expenses  would be in addition to the advisory and other  expenses the Portfolio
bears directly in connection with its own operations.

         Securities Lending.  Collateral for loans of portfolio  securities made
by the Portfolio may consist of cash,  cash  equivalents,  securities  issued or
guaranteed by the U.S. Government or its agencies or irrevocable bank letters of
credit (or any combination thereof). The borrower of securities will be required
to maintain the market value of the collateral at not less than the market value
of the loaned  securities,  and such value will be  monitored  on a daily basis.
When the Portfolio lends its securities,  it continues to receive  dividends and
interest on the securities  loaned and may  simultaneously  earn interest on the
investment of the cash collateral. Although voting rights, or rights to consent,
attendant to securities on loan pass to the borrower,  such loans will be called
so that the  securities  may be  voted  by the  Portfolio  if a  material  event
affecting the investment is to occur.

         Equity Swaps.  The  Portfolio  may enter into equity swap  contracts to
invest in a market  without owning or taking  physical  custody of securities in
circumstances  in which direct  investment is restricted for legal reasons or is
otherwise  impracticable.  Equity swaps may also be used for hedging purposes or
to seek to increase total return.  The  counterparty  to an equity swap contract
will typically be a bank, investment banking firm or broker/dealer.  Equity swap
contracts may be structured in different ways. For example,  a counterparty  may
agree to pay the Portfolio the amount,  if any, by which the notional  amount of
the equity swap contract  would have  increased in value had it been invested in
particular  stocks (or an index of stocks),  plus the dividends  that would have
been received on those stocks. In these cases, the Portfolio may agree to pay to
the  counterparty  the amount,  if any, by which that notional amount would have
decreased in value had it been invested in the stocks.  Therefore, the return to
the  Portfolio  on any equity  swap  contract  should be the gain or loss on the
notional  amount  plus  dividends  on the stocks less the  interest  paid by the
Portfolio  on the notional  amount.  In other cases,  the  counterparty  and the
Portfolio  may each agree to pay the other the  difference  between the relative
investment  performances that would have been achieved if the notional amount of
the equity swap  contract had been  invested in different  stocks (or indices of
stocks).

         The Portfolio  will enter into equity swaps only on a net basis,  which
means that the two payment streams are netted out, with the Portfolio  receiving
or paying, as the case may be, only the net amount of the two payments. Payments
may be made at the conclusion of an equity swap contract or periodically  during
its term.  Equity  swaps do not involve  the  delivery  of  securities  or other
underlying assets. Accordingly, the risk of loss with respect to equity swaps is
limited  to the net  amount of  payments  that the  Portfolio  is  contractually
obligated  to  make.  If  the  other  party  to an  equity  swap  defaults,  the
Portfolio's  risk of loss  consists  of the net  amount  of  payments  that  the
Portfolio  is  contractually  entitled  to  receive,  if any.  Inasmuch as these
transactions  are entered into for hedging  purposes or are offset by segregated
cash or liquid assets to cover the Portfolio's potential exposure, the Portfolio
and the Investment  Adviser believe that  transactions do not constitute  senior
securities  under the 1940 Act and,  accordingly,  will not treat  them as being
subject to the Portfolio's borrowing restrictions.

         The Portfolio will not enter into any equity swap  transactions  unless
the unsecured  commercial  paper,  senior debt or  claims-paying  ability of the
other  party is rated  either A or A-1 or better by  Standard  & Poor's,  Duff &
Phelps or Fitch IBCA,  or A or P-1 or better by Moody's  Investors  Service.  If
there is a default by the other party to such a transaction,  the Portfolio will
have contractual remedies pursuant to the agreements related to the transaction.

         The use of equity swaps is a highly specialized activity which involves
investment  techniques and risks  different from those  associated with ordinary
portfolio securities transactions. If the Investment Adviser is incorrect in its
forecasts of market values, the investment performance of the Portfolio would be
less  favorable  than it would have been if this  investment  technique were not
used.

         Convertible  Securities.  Convertible  securities entitle the holder to
receive interest paid or accrued on debt or the dividend paid on preferred stock
until the convertible securities mature or are redeemed, converted or exchanged.
Prior to conversion,  convertible  securities  have  characteristics  similar to
ordinary debt securities in that they normally provide a stable stream of income
with  generally  higher yields than those of common stock of the same or similar
issuers.  Convertible  securities rank senior to common stock in a corporation's
capital   structure   and  therefore   generally   entail  less  risk  than  the
corporation's  common  stock,  although the extent to which such risk is reduced
depends in large measure upon the degree to which the convertible security sells
above its value as a fixed income security.

         In  selecting  convertible  securities,  the  Investment  Adviser  will
consider,  among other  factors:  an evaluation of the  creditworthiness  of the
issuers of the  securities;  the  interest or dividend  income  generated by the
securities;  the potential for capital  appreciation  of the  securities and the
underlying  common  stocks;  the  prices  of the  securities  relative  to other
comparable  securities  and  to  the  underlying  common  stocks;   whether  the
securities  are  entitled to the benefits of sinking  funds or other  protective
conditions;  diversification  of the  Portfolio  securities  as to issuers;  and
whether  the  securities  are rated by a rating  agency  and, if so, the ratings
assigned.

         The value of convertible  securities is a function of their  investment
value  (determined by yield in comparison with the yields of other securities of
comparable  maturity and quality that do not have a  conversion  privilege)  and
their  conversion  value (their worth,  at market value,  if converted  into the
underlying  common  stock).  The investment  value of convertible  securities is
influenced by changes in interest  rates,  with  investment  value  declining as
interest rates  increase and  increasing as interest  rates decline,  and by the
credit  standing  of the  issuer  and other  factors.  The  conversion  value of
convertible  securities  is  determined  by the market  price of the  underlying
common stock. If the conversion  value is low relative to the investment  value,
the  price  of the  convertible  securities  is  governed  principally  by their
investment  value. To the extent the market price of the underlying common stock
approaches  or  exceeds  the  conversion  price,  the  price of the  convertible
securities  will be  increasingly  influenced  by  their  conversion  value.  In
addition,  convertible  securities  generally  sell  at  a  premium  over  their
conversion  value determined by the extent to which investors place value on the
right to  acquire  the  underlying  common  stock  while  holding  fixed  income
securities.

         Capital  appreciation  for the Portfolio may result from an improvement
in the credit  standing of an issuer whose  securities are held in the Portfolio
or from a  general  lowering  of  interest  rates,  or a  combination  of  both.
Conversely, a reduction in the credit standing of an issuer whose securities are
held by the Portfolio or a general increase in interest rates may be expected to
result in capital depreciation to the Portfolio.

         In general,  investments  in lower quality  convertible  securities are
subject  to a  significant  risk of a change in the credit  rating or  financial
condition of the issuing entity. Investments in convertible securities of medium
or lower quality are also likely to be subject to greater market fluctuation and
to greater risk of loss of income and principal due to default than  investments
of  higher  quality  fixed-income  securities.  Such  lower  quality  securities
generally  tend to reflect  short-term  corporate and market  developments  to a
greater extent than higher quality securities,  which react more to fluctuations
in the general level of interest rates. The Portfolio will generally reduce risk
to the investor by  diversification,  credit  analysis and  attention to current
developments in trends of both the economy and financial markets. However, while
diversification reduces the effect on the Portfolio of any single investment, it
does not reduce the overall risk of investing in lower quality securities.

         Risks Related to Small Company Securities. While the Investment Adviser
believes  that smaller  companies  can provide  greater  growth  potential  than
larger,  more mature firms,  investing in the  securities of such companies also
involves greater risk, portfolio price volatility and cost. Historically,  small
capitalization  stocks, which will be the Portfolio's primary  investments,  and
stocks of recently organized companies,  in which the Portfolio may also invest,
have been more volatile in price than the larger  capitalization stocks included
in the S&P 500 Index.  Among the reasons for this greater price  volatility  are
the lower degree of market  liquidity  (the  securities of companies  with small
stock market  capitalizations  may trade less  frequently and in limited volume)
and the greater sensitivity of small companies to changing economic  conditions.
For example,  these companies are associated with higher  investment risk due to
the greater  business risks of small size and limited  product  lines,  markets,
distribution channels and financial and managerial resources.

         The  values  of  small  company   stocks  will   frequently   fluctuate
independently  of the values of larger company stocks.  Small company stocks may
decline in price as large  company  stock prices rise, or rise in price as large
company stock prices decline. You should,  therefore,  expect that the net asset
value of the  Portfolio's  shares will be more volatile  than, and may fluctuate
independently of, broad stock market indices such as the S&P 500 Index.

         The additional  costs  associated with the acquisition of small company
stocks include  brokerage  costs,  market impact costs (that is, the increase in
market prices which may result when the Portfolio purchases thinly traded stock)
and the effect of the "bid-ask" spread in small company stocks. These costs will
be borne by all shareholders and may negatively impact investment performance.

         Risks Related to Medium and Lower Quality  Securities.  Investments  in
medium and lower quality securities present special risk considerations.  Medium
quality securities, although considered investment grade, are also considered to
have  speculative  characteristics.  Lower  quality  securities  are  considered
predominately  speculative by traditional  investment standards.  In some cases,
these obligations may be highly speculative and have poor prospects for reaching
investment grade standard. While any investment carries some risk, certain risks
associated   with  lower  quality   securities  are  different  from  those  for
investment-grade securities. The risk of loss through default is greater because
lower quality  securities are usually  unsecured and are often subordinate to an
issuer's  other  obligations.  Additionally,  the  issuers  of these  securities
frequently  have  high debt  levels  and are thus more  sensitive  to  difficult
economic  conditions,  individual  corporate  developments  and rising  interest
rates. Consequently,  the market price of these securities may be quite volatile
and may result in wider  fluctuations  of the  Portfolio's  net asset  value per
share.

         There  remains  some  uncertainty  about the  performance  level of the
market  for  lower  quality   securities   under  adverse  market  and  economic
environments.  An economic  downturn or increase in interest  rates could have a
negative impact on both the markets for lower quality securities (resulting in a
greater number of bond defaults) and the value of lower quality  securities held
in a portfolio of investments.

         The economy and  interest  rates can affect  lower  quality  securities
differently  than other  securities.  For example,  the prices of lower  quality
securities  are  more  sensitive  to  adverse  economic  changes  or  individual
corporate  developments  than are the prices of higher quality  investments.  In
addition,  during an  economic  downturn or period in which  interest  rates are
rising   significantly,   highly  leveraged  issuers  may  experience  financial
difficulties,  which, in turn,  would adversely  affect their ability to service
their principal and interest payment obligations,  meet projected business goals
and obtain additional financing.

         The  market  value  of  lower  quality   securities  tends  to  reflect
individual  corporate  developments  to a  greater  extent  than  that of higher
quality securities which react primarily to fluctuations in the general level of
interest rates.  Lower quality  securities are often issued in connection with a
corporate reorganization or restructuring or as a part of a merger, acquisition,
takeover or similar event.  They are also issued by less  established  companies
seeking  to  expand.  Such  issuers  are often  highly  leveraged,  may not have
available to them more  traditional  methods of financing and are generally less
able than more established or less leveraged entities to make scheduled payments
of  principal  and  interest in the event of adverse  economic  developments  or
business conditions.

         A holder's risk of loss from default is significantly greater for lower
quality securities than is the case for holders of other debt securities because
such securities are generally unsecured and are often subordinated to the rights
of  other  creditors  of the  issuers  of  such  securities.  Investment  by the
Portfolio  in  defaulted   securities  poses  additional  risk  of  loss  should
nonpayment  of principal  and interest  continue in respect of such  securities.
Even if such  securities are held to maturity,  recovery by the Portfolio of its
initial investment and any anticipated income or appreciation will be uncertain.
The  Portfolio  may also incur  additional  expenses  in seeking  recovering  on
defaulted  securities.  If an issuer of a security  defaults,  the Portfolio may
incur  additional  expenses to seek recovery.  In addition,  periods of economic
uncertainty would likely result in increased volatility for the market prices of
lower quality securities as well as the Portfolio's net asset value. In general,
both the prices and yields of lower quality securities will fluctuate.

         The secondary  market for lower quality  securities is  concentrated in
relatively  few  market  makers and is  dominated  by  institutional  investors,
including mutual funds,  insurance  companies and other financial  institutions.
Accordingly,  the secondary  market for such securities is not as liquid as, and
is more volatile than, the secondary  market for higher quality  securities.  In
addition,  market  trading  volume for high yield  fixed  income  securities  is
generally  lower and the secondary  market for such  securities  could  contract
under adverse market or economic conditions, independent of any specific adverse
changes in the  condition  of a  particular  issuer.  These  factors may have an
adverse  effect on the market  price and the  Portfolio's  ability to dispose of
particular  portfolio  investments.  A less developed  secondary market may also
make it more  difficult  for the Portfolio to obtain  precise  valuations of the
high yield securities in its portfolio.

         Adverse  publicity  and investor  perceptions,  whether or not based on
fundamental  analysis,  may  decrease the value and  liquidity of lower  quality
convertible  securities  held by the  Portfolio,  especially  in a thinly traded
market.  Illiquid or  restricted  securities  held by the  Portfolio may involve
special registration responsibilities,  liabilities and costs, and could involve
other liquidity and valuation difficulties.

         The credit ratings assigned by a rating agency evaluate the safety of a
rated  security's  principal and interest  payments,  but do not address  market
value  risk  and,  therefore,  may  not  fully  reflect  the  true  risks  of an
investment.  Because the ratings of the rating  agencies may not always  reflect
current  conditions and events,  in addition to using recognized rating agencies
and other  sources,  the  Investment  Adviser  performs  its own analysis of the
issuers whose lower quality securities the Portfolio holds. Because of this, the
Portfolio's  performance  may depend  more on its  Investment  Adviser's  credit
analysis  than  is  the  case  of  mutual  funds  investing  in  higher  quality
securities.

         Investment Companies.  With respect to the investments of the Portfolio
in the  securities  of other  investment  companies,  such  investments  will be
limited so that,  as  determined  after a purchase is made,  either (a) not more
than 3% of the total outstanding stock of such investment  company will be owned
by the Portfolio,  the Trust as a whole and their affiliated persons (as defined
in the 1940 Act) or (b) (i) not more than 5% of the value of the total assets of
the Portfolio will be invested in the securities of any one investment  company;
(ii) not more than 10% of the value of its total  assets will be invested in the
aggregate in securities of investment  companies as a group;  and (iii) not more
than 3% of the  outstanding  voting stock of any one investment  company will be
owned by the Portfolio.

         Certain  investment  companies  whose  securities  are purchased by the
Portfolio may not be obligated to redeem such securities in an amount  exceeding
1% of the investment company's total outstanding securities during any period of
less than 30 days.  Therefore,  such  securities  that exceed this amount may be
illiquid.  Notwithstanding  the  foregoing,  the  Portfolio  may  adhere to more
restrictive  limitations with respect to its investments in securities issued by
other  investment  companies  if required by the SEC or deemed to be in the best
interests of the Trust.  If required by the 1940 Act, the  Portfolio  expects to
vote the shares of other  investment  companies  that are held by it in the same
proportion as the vote of all other holders of such securities.

         Yields and Ratings.  The yields on certain  obligations,  including the
money market  instruments  in which the  Portfolio  invests,  are dependent on a
variety of factors,  including  general economic  conditions,  conditions in the
particular market for the obligation, financial condition of the issuer, size of
the offering,  maturity of the obligation and ratings of the issue.  The ratings
of Standard & Poor's, Moody's, Duff, Fitch and Thomson BankWatch, Inc. represent
their respective opinions as to the quality of the obligations they undertake to
rate. Ratings,  however,  are general and are not absolute standards of quality.
Consequently,  obligations with the same rating,  maturity and interest rate may
have different  market prices.  For a more complete  discussion of ratings,  see
Appendix A to this Additional Statement.

         Subject to the limitations stated in the Prospectus, if a security held
by the Portfolio undergoes a rating revision, the Portfolio may continue to hold
the security if the Investment Adviser determines such retention is warranted.

         Stock  Indices.  The  Russell  2000  Small  Stock  Index  is  a  market
value-weighted  index  composed of the stocks of the smallest 2000  companies in
the  Russell  3000  Index,  which is  composed  of the stocks of 3000 large U.S.
domiciled   companies   (based  on   market   capitalization)   that   represent
approximately 98% of the investable U.S. equity markets. Because of its emphasis
on the smallest 2000 companies,  the Russell Index represents  approximately 10%
of the total market  capitalization  of the Russell 3000 Index.  As of September
30, 1999, the average  market  capitalization  of the companies  included in the
Russell Index was approximately $540 million. The Russell Index is reconstituted
annually to reflect changes in market capitalization.  The primary criteria used
by Frank  Russell  &  Company  ("Russell")  to  determine  the  initial  list of
securities  eligible for  inclusion in the Russell 3000 Index (and  accordingly,
the Russell  Index) is total market  capitalization  adjusted for large  private
holdings and cross-ownership. However, companies are not selected by Russell for
inclusion in the Russell Index because they are expected to have superior  stock
price  performance  relative  to the  market  in  general  or  other  stocks  in
particular.  Russell makes no representation or warranty, implied or express, to
purchasers  of  Portfolio  shares or any  member  of the  public  regarding  the
advisability  of investing in the  Portfolio or the ability of the Russell Index
to track general market performance of small capitalization stocks.

         Calculation Of Portfolio Turnover Rate. The portfolio turnover rate for
the  Portfolio  is  calculated  by dividing  the lesser of purchases or sales of
portfolio  investments for the reporting  period by the monthly average value of
the portfolio  investments  owned during the reporting  period.  The calculation
excludes all securities, including options, whose maturities or expiration dates
at the time of  acquisition  are one year or less.  Portfolio  turnover may vary
greatly  from  year to year as well as  within  a  particular  year,  and may be
affected by, changes in the holdings of specific issuers, changes in country and
currency  weightings,   cash  requirements  for  redemption  of  shares  and  by
requirements which enable the Portfolio to receive favorable tax treatment.  The
Portfolio had not commenced operations during the fiscal year ended November 30,
1998.  The  Portfolio  is not  restricted  by policy  with  regard to  portfolio
turnover and will make changes in its investment  portfolio from time to time as
business and economic conditions as well as market prices may dictate.

Illiquid or Restricted Securities. The Portfolio may invest up to 15% of its net
assets in securities  that are  illiquid.  Commercial  paper issued  pursuant to
Section 4(2) of the 1933 Act and securities  that are not  registered  under the
1933 Act but can be sold to "qualified  institutional buyers" in accordance with
Rule 144A  under  the 1933 Act will not be  considered  illiquid  so long as the
Investment Adviser determines, under guidelines approved by the Trust's Board of
Trustees,  that an adequate trading market exists.  This practice could increase
the level of illiquidity during any period that qualified  institutional  buyers
become uninterested in purchasing these securities.

         Miscellaneous.  Securities  may be  purchased  on margin only to obtain
such  short-term  credits as are  necessary  for the  clearance of purchases and
sales of securities.  The Portfolio will not engage in selling securities short.
The  Portfolio  may,  however,  make short sales  against the box  although  the
Portfolio has no current  intention to do so in the coming year.  "Selling short
against  the box"  involves  selling  a  security  that the  Portfolio  owns for
delivery at a specified date in the future.

                             INVESTMENT RESTRICTIONS

         The  Portfolio is subject to the  fundamental  investment  restrictions
enumerated  below  which  may be  changed  only  by a vote of the  holders  of a
majority of the Portfolio's outstanding shares.

The Portfolio may not:

         (1)  Make loans, except (a) through the purchase of debt obligations in
              accordance with the Portfolio's investment objective and policies,
              (b) through repurchase agreements with banks, brokers, dealers and
              other financial institutions, and (c) loans of securities.

         (2)  Mortgage, pledge or hypothecate any assets (other than pursuant to
              reverse   repurchase   agreements)   except  to  secure  permitted
              borrowings.

         (3)  Purchase or sell real estate or real estate limited  partnerships,
              but  this  restriction   shall  not  prevent  the  Portfolio  from
              investing directly or indirectly in portfolio  instruments secured
              by real estate or  interests  therein or acquiring  securities  of
              real estate  investment  trusts or other issuers that deal in real
              estate.

         (4)  Purchase or sell commodities or commodity  contracts or oil or gas
              or other mineral  exploration or  development  programs or leases,
              except that the Portfolio  may, to the extent  appropriate  to its
              investment policies,  purchase securities of companies engaging in
              whole or in part in such  activities,  and may enter into  futures
              contracts  and  related  options  and  forward  currency  exchange
              contracts  in  accordance   with  its  investment   objective  and
              policies.

         (5) Invest in companies for the purpose of exercising control.

         (6)  Act as underwriter  of securities,  except as the Portfolio may be
              deemed to be an underwriter  under the Securities Act of 1933 (the
              "1933 Act") in connection  with the purchase and sale of portfolio
              instruments  in  accordance  with  its  investment  objective  and
              portfolio management policies.

         (7)  Write puts, calls or combinations thereof, except for transactions
              in options on securities,  financial  instruments,  currencies and
              indices  of  securities;  futures  contracts;  options  on futures
              contracts;  forward currency contracts;  short sales of securities
              against the box;  interest rate swaps; and pair-off  transactions.
              (This  restriction  does not apply to any type of option,  futures
              contract,   forward   contract,   short  sale,  swap  or  pair-off
              transaction unless it involves a put, call or combination  thereof
              written by the Portfolio.)

         (8)  Make   any   investment    inconsistent   with   the   Portfolio's
              classification as a diversified  investment company under the 1940
              Act.

         (9)  Purchase  securities (other than obligations  issued or guaranteed
              by the U.S.  Government,  its  agencies or  instrumentalities  and
              securities of other  investment  companies) if such purchase would
              cause more than 25% in the  aggregate  of the market  value of the
              total assets of the Portfolio to be invested in the  securities of
              one or more issuers having their principal business  activities in
              the same  industry.  For the purposes of this  restriction,  as to
              utility  companies,   the  gas,  electric,   water  and  telephone
              businesses are considered  separate  industries;  personal  credit
              finance companies and business credit finance companies are deemed
              to be separate industries;  and wholly-owned finance companies are
              considered  to be in the  industries  of  their  parents  if their
              activities  are primarily  related to financing the  activities of
              their parents.

         (10) Borrow   money   (other  than   pursuant  to  reverse   repurchase
              agreements),  except (a) as a temporary measure,  and then only in
              amounts not  exceeding  5% of the value of the  Portfolio's  total
              assets or (b) from banks, provided that immediately after any such
              borrowing all borrowings of the Portfolio do not exceed  one-third
              of the Portfolio's  total assets.  No purchases of securities will
              be made if borrowings subject to this restriction exceed 5% of the
              value of the Portfolio's  assets. The exceptions in (a) and (b) to
              this restriction are not for investment  leverage purposes but are
              solely for  extraordinary  or emergency  purposes or to facilitate
              management  of  the  Portfolio  by  enabling  the  Trust  to  meet
              redemption requests when the liquidation of Portfolio  instruments
              is deemed to be disadvantageous or not possible.  If due to market
              fluctuations  or other  reasons the total assets of the  Portfolio
              fall below 300% of its borrowings,  the Trust will promptly reduce
              the borrowings of the Portfolio in accordance with the 1940 Act.

         (11) Notwithstanding  any of the Trust's other  fundamental  investment
              restrictions  (including,  without limitation,  those restrictions
              relating to issuer  diversification,  industry  concentration  and
              control),   the  Portfolio   may  purchase   securities  of  other
              investment companies to the full extent permitted under Section 12
              of the 1940 Act (or any successor  provision thereto) or under any
              regulation or order of the Securities and Exchange Commission; and
              the Portfolio may invest all or substantially all of its assets in
              a single  open-end  investment  company  or  series  thereof  with
              substantially   the  same  investment   objective,   policies  and
              fundamental restrictions as the Portfolio.

         In applying  Restriction  No. 9 above,  a security is  considered to be
issued by the entity, or entities,  whose assets and revenues back the security.
A guarantee of a security is not deemed to be a security issued by the guarantor
when the value of all securities  issued and  guaranteed by the  guarantor,  and
owned by the  Portfolio,  does not  exceed  10% of the value of the  Portfolio's
total assets.

         Except to the extent otherwise provided in Investment Restriction No. 9
for the purpose of such restriction,  in determining industry classification the
Trust  intends  to use  the  industry  classification  titles  in the  Bloomberg
Industry Group  Classifications.  Securities held in escrow or separate accounts
in  connection  with the  Portfolio's  investment  practices  described  in this
Additional  Statement  and in the  Prospectus  are not  deemed to be  mortgaged,
pledged or hypothecated for purposes of the foregoing Investment Restrictions.

         In addition,  as a matter of fundamental policy, the Portfolio will not
issue senior  securities  except as stated in the Prospectus or this  Additional
Statement.

         Any  restriction  which  involves  a  maximum  percentage  will  not be
considered  violated  unless an excess over the  percentage  occurs  immediately
after,  and is caused by, an  acquisition or encumbrance of securities or assets
of, or borrowings by, the Portfolio.

                          ADDITIONAL TRUST INFORMATION

TRUSTEES AND OFFICERS

         The  business  and affairs of the Trust and the  Portfolio  are managed
under the direction of the Trust's Board of Trustees.  Information pertaining to
the Trustees and officers of the Trust is set forth below.


<PAGE>
<TABLE>
<CAPTION>
<S><C>                           <C>      <C>                <C>
NAME                                      POSITION(S)        PRINCIPAL OCCUPATION(S)
AND ADDRESS                      AGE      WITH TRUST         DURING PAST 5 YEARS
- -----------                      ---      ----------         -------------------

William H. Springer              69       Chairman           Director of Walgreen  Co. (a retail drug store
701 Morningside Drive                     and                business) since April 1988;  Director  Trustee
Lake Forest, IL 60045                     Trustee            of  Baker,   Fentress  &  Co.  (a  closed-end,
                                                             non-diversified
                                                             management
                                                             investment company)
                                                             from  April 1992 to
                                                             present; Trustee of
                                                             Goldman Sachs Trust
                                                             (a       registered
                                                             investment company)
                                                             from     1989    to
                                                             present.

Richard Gordon Cline             64       Trustee            Chairman and Director of Hussman
4200 Commerce Court                                          International Inc. (commercial refrigeration
Suite 300                                                    company) since January 1998; Chairman of
Lisle, IL 60532                                              Hawthorne Inc. (a management advisory
                                                             services        and
                                                             private  investment
                                                             company)      since
                                                             January       1996;
                                                             Chairman, President
                                                             and  CEO  of  NICOR
                                                             Inc. (a diversified
                                                             public      utility
                                                             holding    company)
                                                             from  1985 to 1996;
                                                             Chairman        and
                                                             Director   of   the
                                                             Federal     Reserve
                                                             Bank   of   Chicago
                                                             from  1992 to 1995;
                                                             Director of Central
                                                             DuPage       Health
                                                             System,         Pet
                                                             Incorporated     (a
                                                             commercial     food
                                                             company),   Whitman
                                                             Corporation      (a
                                                             diversified holding
                                                             company),     Kmart
                                                             Corporation      (a
                                                             retailing company),
                                                             Ryerson Tull,  Inc.
                                                             (a           metals
                                                             distribution
                                                             company)        and
                                                             University       of
                                                             Illinois
                                                             Foundation.



<PAGE>



NAME                                      POSITION(S)        PRINCIPAL OCCUPATION(S)
AND ADDRESS                      AGE      WITH TRUST         DURING PAST 5 YEARS
- -----------                      ---      ----------         -------------------

Edward J. Condon, Jr.            58       Trustee            Chairman and CEO of The Paradigm Group, Ltd.
Sears Tower, Suite 9650                                      (a financial advisor) since July 1993; within
233 S. Wacker Drive                                          the. last five years he has served as Vice Chairman
Chicago, IL 60606                                            and Director of Energenics L.L.C. (a waste
                                                             recycling company);
                                                             Director         of
                                                             Financial   Pacific
                                                             Company         (an
                                                             equipment   leasing
                                                             company); Member of
                                                             the     Board    of
                                                             Managers   of   The
                                                             Liberty   Hampshire
                                                             Company,   LLC   (a
                                                             receivable
                                                             securitization
                                                             company), Member of
                                                             Advisory  Board  of
                                                             Real-Time   U.S.A.,
                                                             Inc.   (a  software
                                                             company); Member of
                                                             the     Board    of
                                                             Directors        of
                                                             University    Elder
                                                             Care, Inc.;  Member
                                                             of  the   Board  of
                                                             Directors   of  the
                                                             Girl    Scouts   of
                                                             Chicago;  Member of
                                                             the     Board    of
                                                             Trustees         of
                                                             Dominican
                                                             University.

John W. English                  66       Trustee            Private Investor since 1993; Vice President
50-H New England Ave.                                        and Chief Investment Officer of The Ford
P.O. Box 640                                                 Foundation (a charitable trust) from 1981
Summit. NJ 07902-0640                                        until 1993; Trustee of The China Fund, Inc. (a registered
                                                             investment
                                                             company),  American
                                                             Red     Cross    in
                                                             Greater  New  York,
                                                             Mote         Marine
                                                             Laboratory       (a
                                                             non-profit   marine
                                                             research facility),
                                                             State      Street's
                                                             Select  Sector SPDR
                                                             Trust (a registered
                                                             investment
                                                             company),
                                                             Washington Mutual's
                                                             WM     Funds     (a
                                                             registered
                                                             investment company)
                                                             and  United   Board
                                                             for       Christian
                                                             Higher Education in
                                                             Asia.  Director  of
                                                             University  of Iowa
                                                             Foundation,
                                                             Blanton-Peale
                                                             Institutes       of
                                                             Religion        and
                                                             Health,   Community
                                                             Foundation       of
                                                             Sarasota    County,
                                                             and Duke Management
                                                             Company         (an
                                                             investment
                                                             adviser).

Sandra Polk Guthman              55       Trustee            President  and  CEO of Polk  Bros.  Foundation
420 N. Wabash Avenue                                         (an Illinois not-for-profit  corporation) from
Suite 204                                                    1993  to   present;   Director   of   Business
Chicago, IL 60611                                            Transformation  from  1992-1993 and Midwestern
                                                             Director         of
                                                             Marketing      from
                                                             1988-1992  for  IBM
                                                             (a       technology
                                                             company);  Director
                                                             of  MBIA  Insurance
                                                             Corporation      of
                                                             Illinois      (bank
                                                             holding    company)
                                                             since    1994   and
                                                             Avondale  Financial
                                                             Corporation      (a
                                                             stock  savings  and
                                                             loan        holding
                                                             company)      since
                                                             1995.


<PAGE>



NAME                                      POSITION(S)        PRINCIPAL OCCUPATION(S)
AND ADDRESS                      AGE      WITH TRUST         DURING PAST 5 YEARS
- -----------                      ---      ----------         -------------------

Frederick T. Kelsey              71       Trustee            Consultant to Goldman Sachs (an investment
3133 Laughing Gull Court                                     adviser) from December 1985 through February
Johns Island, SC 29455                                       1988; Director of Goldman Sachs Funds Group
                                                             (a        financial
                                                             services  provider)
                                                             and Vice  President
                                                             of  Goldman   Sachs
                                                             from May 1981 until
                                                             his  retirement  in
                                                             November      1985;
                                                             President       and
                                                             Treasurer   of  the
                                                             Trust   and   other
                                                             investment
                                                             companies
                                                             affiliated     with
                                                             Goldman       Sachs
                                                             through      August
                                                             1985;     President
                                                             from  1983  to 1985
                                                             and  Trustee   from
                                                             1983 to 1994 of The
                                                             Centerland    Funds
                                                             and its  successor,
                                                             The Pilot  Funds (a
                                                             registered
                                                             investment
                                                             company);   Trustee
                                                             of          various
                                                             management
                                                             investment
                                                             companies
                                                             affiliated     with
                                                             Zurich       Kemper
                                                             Investments     (an
                                                             investment
                                                             adviser).


Richard P. Strubel               59       Trustee            Managing Director of Tandem Partners, Inc. (a
737 N. Michigan Avenue                                       privately held management services firm)
Suite 1405                                                   since 1990; President and CEO of Microdot,
Chicago, IL 60611                                            Inc. (a privately held manufacturing firm)
                                                             from  January  1984
                                                             to  October   1994;
                                                             Trustee  of Goldman
                                                             Sachs    Trust   (a
                                                             registered
                                                             investment company)
                                                             from     1987    to
                                                             present;   Director
                                                             of           Kaynar
                                                             Technologies   Inc.
                                                             (a          leading
                                                             manufacturer     of
                                                             aircraft fasteners)
                                                             since  March  1997;
                                                             Trustee    of   the
                                                             University       of
                                                             Chicago;   Director
                                                             of       Children's
                                                             Memorial    Medical
                                                             Center.


Jylanne M. Dunne                 39       President          Senior Vice President for Distribution
4400 Computer Drive                                          Services at First Data Investor Services
Westborough, MA 01581                                        Group, Inc. ("FDISG") (since 1988).

Richard H. Rose                  43       Vice President     Vice President and Division Manager of Mutual
4400 Computer Drive                                          Fund Administration at FDISG (since 1994);
Westborough, MA 01581                                        Senior Vice President at The Boston Company
                                                             Advisors, Inc. (a financial services
                                                             provider) (prior thereto).

Brian R. Curran                  31       Treasurer          Director of Fund Administration and
4400 Computer Drive                                          Accounting at FDISG (since 1997); Director of
Westborough, MA 01581                                        Fund Administration at State Street Bank and
                                                             Trust       Company
                                                             (February  1997  to
                                                             October      1997);
                                                             Senior  Auditor  at
                                                             Price    Waterhouse
                                                             L.L.P.    (February
                                                             1994  to   February
                                                             1997);  Manager  of
                                                             Fund  Accounting at
                                                             State  Street  Bank
                                                             and  Trust  Company
                                                             (prior thereto).

Linda J. Hoard                   51       Secretary          Counsel at FDISG (since 1998); Attorney
4400 Computer Drive                                          Consultant for Fidelity Investments (an
Westborough, MA 01581                                        investment adviser), Investors Bank & Trust
                                                             Company          (a
                                                             financial   service
                                                             provider) and FDISG
                                                             (September  1994 to
                                                             June  1998);   Vice
                                                             President       and
                                                             Assistant   General
                                                             Counsel    at   MFS
                                                             Investment
                                                             Management      (an
                                                             investment adviser)
                                                             (prior thereto).


<PAGE>



NAME                                      POSITION(S)        PRINCIPAL OCCUPATION(S)
AND ADDRESS                      AGE      WITH TRUST         DURING PAST 5 YEARS
- -----------                      ---      ----------         -------------------

Teresa M.R. Hamlin               34       Assistant          Counsel at FDISG (since 1994); Paralegal
4400 Computer Drive                       Secretary          Manager at The Boston Company Advisors, Inc.
Westborough, MA 01581                                        (an investment adviser) (prior thereto).

Therese Hogan                    36       Assistant          Director of the State Regulation Department
4400 Computer Drive                       Secretary          at FDISG (since 1994); Senior Legal Assistant
Westborough, MA 01581                                        at Palmer and Dodge (a Massachusetts law
                                                             firm) (prior thereto).
</TABLE>

         Certain of the Trustees and officers and the  organizations  with which
they  are  associated  have  had  in the  past,  and  may  have  in the  future,
transactions  with the Investment  Adviser,  First Data Investor Services Group,
Inc. ("FDISG"), a wholly-owned subsidiary of First Data Corporation,  First Data
Distributors,  Inc., a subsidiary of FDISG, ("FDDI" and collectively with FDISG,
"First  Data") and their  respective  affiliates.  The Trust has been advised by
such Trustees and officers that all such transactions have been and are expected
to be in the  ordinary  course of business  and the terms of such  transactions,
including  all loans and loan  commitments  by such  persons,  have been and are
expected to be  substantially  the same as the  prevailing  terms for comparable
transactions for other customers. As a result of the responsibilities assumed by
the  Investment  Adviser  under the Advisory  Agreement  for the  Portfolio,  by
Northern  under  its  Transfer  Agency  Agreement,   Custodian  Agreement,   and
Co-Administration Agreement with the Trust, by FDISG under its Co-Administration
Agreement with the Trust and by FDDI under its  Distribution  Agreement with the
Trust, the Trust itself requires no employees.

         Each officer holds  comparable  positions with certain other investment
companies of which First Data or an affiliate thereof is the investment adviser,
administrator and/or distributor.

         Each Trustee  earns a quarterly  retainer of $6,750 and the Chairman of
the Board earns a quarterly  retainer of $10,125.  Each  Trustee,  including the
Chairman  of the  Board,  earns an  additional  fee of $2,500  for each  meeting
attended, plus reimbursement of expenses incurred as a Trustee.

         In  addition,   the  Trustees  have   established  an  Audit  Committee
consisting of three  members  including a Chairman of the  Committee.  The Audit
Committee members are Messrs. Condon, Kelsey and Strubel (Chairman). Each member
earns a fee of  $2,500  for  each  meeting  attended  and the  Chairman  earns a
quarterly retainer of $1,500.

         Each Trustee will hold office for an indefinite term until the earliest
of (1) the next  meeting  of  shareholders  if any,  called  for the  purpose of
considering  the election or  re-election of such Trustee and until the election
and qualification of his or her successor,  if any, elected at such meeting; (2)
the date a Trustee  resigns or retires,  or a Trustee is removed by the Board of
Trustees  or  shareholders,   in  accordance  with  the  Trust's  Agreement  and
Declaration of Trust, or (3) in accordance  with the current  resolutions of the
Board of Trustees (which may be changed without  shareholder  vote), on the last
day of the  fiscal  year of the Trust in which he or she  attains  the age of 72
years.

         The Trust's officers do not receive fees from the Trust for services in
such capacities,  although FDISG, of which they are also officers, receives fees
from the Trust for administrative services.


<PAGE>



         The following table sets forth certain  information with respect to the
compensation of each Trustee of the Trust for the one-year period ended November
30, 1998:
<TABLE>
<CAPTION>
<S><C>                            <C>                           <C>                                  <C>

                                  Aggregate Compensation        Pension or Retirement Benefits       Total Compensation From Trust
                                  from the Trust                Accrued as a Part of Trust's         Paid
Name of Trustee                                                 Expenses                             to Trustees

William H. Springer               $46,750                       N/A                                  $46,750
Richard G. Cline                  $34,000                       N/A                                  $34,000
Edward J. Condon, Jr.             $37,000                       N/A                                  $37,000
John W. English                   $32,500                       N/A                                  $32,500
Sandra Polk Guthman               $34,000                       N/A                                  $34,000
Frederick T. Kelsey               $37,000                       N/A                                  $37,000
Richard P. Strubel                $42,250                       N/A                                  $42,250
</TABLE>

Investment Adviser, Transfer Agent and Custodian

         Northern,  a wholly-owned  subsidiary of Northern Trust Corporation,  a
bank  holding  company,  is one of the nation's  leading  providers of trust and
investment  management services (the "Investment  Adviser").  Northern is one of
the strongest banking  organizations in the United States.  Northern believes it
has built its  organization by serving  clients with integrity,  a commitment to
quality,  and  personal  attention.  Its stated  mission with respect to all its
financial  products and services is to achieve  unrivaled  client  satisfaction.
With  respect to such  clients,  the Trust is  designed  to assist  (i)  defined
contribution  plan  sponsors and their  employees by offering a range of diverse
investment  options to help comply with 404(c)  regulation  and may also provide
educational   material  to  their   employees,   (ii)   employers   who  provide
post-retirement   Employees'  Beneficiary   Associations  ("VEBA")  and  require
investments that respond to the impact of federal  regulations,  (iii) insurance
companies with the day-to-day  management of uninvested cash balances as well as
with  longer-term  investment  needs,  and (iv)  charitable  and  not-for-profit
organizations,   such  as  endowments  and  foundations,   demanding  investment
management  solutions that balance the requirement for sufficient current income
to meet operating expenses and the need for capital  appreciation to meet future
investment objectives.  As of September 30, 1999, the Investment Adviser and its
affiliates  had  approximately  $262.8  billion in assets under  management  for
clients including public and private retirement funds, endowments,  foundations,
trusts, corporations, other investment companies and individuals.

         Subject  to the  general  supervision  of the  Board of  Trustees,  the
Investment  Adviser makes  decisions  with respect to, and place orders for, all
purchases  and sales of portfolio  securities  for the  Portfolio.  The Advisory
Agreement with the Trust provides that in selecting  brokers or dealers to place
orders for  transactions  (a) on common and  preferred  stocks,  the  Investment
Adviser shall use its best judgment to obtain the best overall terms  available,
and (b) on bonds and other fixed  income  obligations,  the  Investment  Adviser
shall  attempt to obtain best net price and  execution.  In  assessing  the best
overall  terms  available  for any  transaction,  the  Investment  Adviser is to
consider all factors it deems  relevant,  including the breadth of the market in
the security,  the price of the security,  the financial condition and execution
capability of the broker or dealer, and the reasonableness of the commission, if
any, both for the specific  transaction and on a continuing basis. In evaluating
the best  overall  terms  available  and in  selecting  the  broker or dealer to
execute a  particular  transaction,  the  Investment  Adviser may  consider  the
brokerage and research  services provided to the Portfolio and/or other accounts
over  which  the  Investment  Adviser  or an  affiliate  of  Northern  exercises
investment  discretion.  A broker or dealer providing  brokerage and/or research
services may receive a higher  commission  than  another  broker or dealer would
receive for the same  transaction.  These  brokerage  and research  services may
include industry and company analyses,  portfolio  services,  quantitative data,
market information systems and economic and political  consulting and analytical
services.

         Transactions on U.S. stock exchanges  involve the payment of negotiated
brokerage  commissions.  On exchanges on which  commissions are negotiated,  the
cost of transactions may vary among different  brokers.  Transactions on foreign
stock exchanges  involve payment for brokerage  commissions  which are generally
fixed.   Over-the-counter   issues,  including  corporate  debt  and  government
securities,  are  normally  traded on a "net" basis (i.e.,  without  commission)
through dealers, or otherwise involve  transactions  directly with the issuer of
an instrument.  With respect to  over-the-counter  transactions,  the Investment
Adviser  will  normally  deal  directly  with  dealers  who make a market in the
instruments  involved except in those  circumstances where more favorable prices
and  execution  are  available  elsewhere.  The  cost of  foreign  and  domestic
securities  purchased from underwriters  includes an underwriting  commission or
concession,  and the prices at which  securities  are purchased from and sold to
dealers include a dealer's mark-up or mark-down.

         The Portfolio may participate,  if and when practicable, in bidding for
the purchase of portfolio  securities  directly  from an issuer in order to take
advantage of the lower purchase  price  available to members of a bidding group.
The Portfolio  will engage in this practice,  however,  only when the Investment
Adviser believes such practice to be in the Portfolio's interests.

         On occasions when the Investment  Adviser deems the purchase or sale of
a  security  to be in the  best  interests  of the  Portfolio  as well as  other
fiduciary  or agency  accounts  managed by it  (including  any other  portfolio,
investment  company or account for which the Investment Adviser act as adviser),
the Advisory  Agreement  provides  that the  Investment  Adviser,  to the extent
permitted by applicable laws and regulations, may aggregate the securities to be
sold or purchased for the Portfolio  with those to be sold or purchased for such
other  accounts in order to obtain best overall terms  available with respect to
common and preferred  stock,  and best net price and  execution  with respect to
bonds and other  fixed  income  obligations.  In such event,  allocation  of the
securities  so  purchased  or  sold,  as well as the  expenses  incurred  in the
transaction,  will be made by the Investment  Adviser in the manner it considers
to be most  equitable  and  consistent  with its  fiduciary  obligations  to the
Portfolio and other accounts  involved.  In some  instances,  this procedure may
adversely  affect the size of the position  obtainable  for the Portfolio or the
amount of the securities that are able to be sold for the Portfolio.

         The Advisory  Agreement provides that the Investment Adviser may render
similar  services to others so long as its services under such Agreement are not
impaired  thereby.  The Advisory  Agreement  also  provides  that the Trust will
indemnify  the  Investment  Adviser  against  certain   liabilities   (including
liabilities  under the Federal  securities laws relating to untrue statements or
omissions of material fact and actions that are in accordance  with the terms of
the Agreement) or, in lieu thereof, contribute to resulting losses.

         Under its Transfer  Agency  Agreement  with the Trust,  with respect to
shares held by  Institutions,  Northern has undertaken to perform some or all of
the following  services:  (1)  establish and maintain an omnibus  account in the
name of each  Institution;  (2) process purchase orders and redemption  requests
from an Institution, and furnish confirmations and disburse redemption proceeds;
(3) act as the income  disbursing  agent of the Trust; (4) answer inquiries from
Institutions;  (5) provide periodic  statements of account to each  Institution;
(6) process and record the issuance and redemption of shares in accordance  with
instructions  from  the  Trust or its  administrator;  (7) if  required  by law,
prepare and forward to Institutions  shareholder  communications  (such as proxy
statements  and  proxies,  annual  and  semi-annual  financial  statements,  and
dividend,  distribution  and tax  notices);  (8) preserve  all records;  and (9)
furnish  necessary  office space,  facilities and personnel.  Under the Transfer
Agency  Agreement,  with respect to shares held by investors,  Northern has also
undertaken to perform some or all of the following  services:  (1) establish and
maintain  separate  accounts in the name of the investors;  (2) process purchase
orders and redemption  requests,  and furnish  confirmations  in accordance with
applicable  law; (3) disburse  redemption  proceeds;  (4) process and record the
issuance and redemption of shares in accordance with instructions from the Trust
or its  administrator;  (5) act as  income  disbursing  agent  of the  Trust  in
accordance with the terms of the Prospectus and  instructions  from the Trust or
its  administrator;  (6) provide  periodic  statements  of  account;  (7) answer
inquiries  (including  requests for  prospectuses  and  statements of additional
information,  and assistance in the completion of new account applications) from
investors and respond to all requests for information  regarding the Trust (such
as current price, recent performance,  and yield data) and questions relating to
accounts of investors (such as possible errors in statements, and transactions);
(8) respond to and seek to resolve all  complaints of investors  with respect to
the Trust or their accounts;  (9) furnish proxy  statements and proxies,  annual
and semi-annual financial statements, and dividend, distribution and tax notices
to investors;  (10) furnish the Trust with all pertinent  Blue Sky  information;
(11) perform all required  tax  withholding;  (12)  preserve  records;  and (13)
furnish necessary office space,  facilities and personnel.  Northern may appoint
one or more sub-transfer agents in the performance of its services.

         As  compensation  for the  services  rendered  by  Northern  under  the
Transfer  Agency  Agreement and the assumption by Northern of related  expenses,
Northern is entitled to a fee from the Trust, payable monthly, at an annual rate
of .01%,  .10% and .15% of the  average  daily net asset value of the Class A, C
and D Shares, respectively, of the Portfolio.

         Under its Custodian  Agreement  with the Trust,  Northern (1) holds the
Portfolio's  cash and  securities,  (2)  maintains  such cash and  securities in
separate  accounts  in the  name  of  the  Portfolio,  (3)  makes  receipts  and
disbursements  of funds on behalf of the Portfolio,  (4) receives,  delivers and
releases  securities on behalf of the  Portfolio,  (5) collects and receives all
income,  principal and other payments in respect of the Portfolio's  investments
held by Northern under the Agreement,  and (6) maintains the accounting  records
of the  Trust.  Northern  may employ one or more  subcustodians,  provided  that
Northern,  subject to certain  monitoring  responsibilities,  shall have no more
responsibility or liability to the Trust on account of any action or omission of
any subcustodian so employed than such subcustodian has to Northern and that the
responsibility or liability of the subcustodian to Northern shall conform to the
resolution  of the  Trustees of the Trust  authorizing  the  appointment  of the
particular subcustodian (or, in the case of foreign securities,  to the terms of
any agreement  entered into between Northern and such subcustodian to which such
resolution relates).  In addition,  the Trust's custodial  arrangements provide,
with respect to foreign securities,  that Northern shall not be: (i) responsible
for the solvency of any subcustodian  appointed by it with reasonable care; (ii)
responsible for any act,  omission,  default or for the solvency of any eligible
foreign  securities  depository;  and (iii) liable for any loss,  damage,  cost,
expense,  liability  or claim  resulting  from  nationalization,  expropriation,
currency  restrictions,  or acts  of war or  terrorism  or any  loss  where  the
subcustodian has otherwise exercised  reasonable care. Northern may also appoint
agents  to carry  out  such of the  provisions  of the  Custodian  Agreement  as
Northern may from time to time direct, provided that the appointment of an agent
shall not relieve Northern of any of its  responsibilities  under the Agreement.
Northern  has  entered  into   agreements   with  financial   institutions   and
depositories  located in foreign  countries  with  respect to the custody of the
Portfolio's foreign securities.

         As compensation  for the services  rendered to the Trust by Northern as
custodian  with  respect to the  Portfolio,  and the  assumption  by Northern of
certain  related  expenses,  Northern is  entitled to payment  from the Trust as
follows:  (i)  $18,000  annually  for the  Portfolio,  plus (ii)  1/100th  of 1%
annually of the  Portfolio's  average  daily net assets to the extent it exceeds
$100  million,  plus  (iii) a fixed  dollar  fee for  each  trade  in  portfolio
securities,  plus  (iv) a fixed  dollar  fee for  each  time  that  Northern  as
Custodian  receives  or  transmits  funds via wire,  plus (v)  reimbursement  of
expenses incurred by Northern as custodian for telephone, postage, courier fees,
office supplies and duplicating.  The fees referred to in clauses (iii) and (iv)
are subject to annual  upward  adjustments  based on  increases  in the Consumer
Price Index for All Urban  Consumers,  provided that Northern may permanently or
temporarily waive all or any portion of any upward adjustment.

         Northern's fees under the Custodian  Agreement are subject to reduction
based on the Portfolio's daily uninvested cash balances (if any).

         Unless  sooner  terminated,   the  Advisory  Agreement,  the  Custodian
Agreement and the Transfer Agency Agreement will continue in effect with respect
to the Portfolio  until April 30, 2000 and thereafter  for  successive  12-month
periods,  provided that the continuance is approved at least annually (1) by the
vote of a majority  of the  Trustees  who are not  parties to the  agreement  or
"interested  persons"  (as such  term is  defined  in the 1940 Act) of any party
thereto,  cast in person at a meeting  called for the  purpose of voting on such
approval,  and  (2)  by  the  Trustees  or by  the  vote  of a  majority  of the
outstanding   shares  of  the   Portfolio   (as  defined   below  under   "Other
Information").  Each agreement is terminable at any time without  penalty by the
Trust (by specified Trustee or shareholder action) on 60 days' written notice to
Northern and by Northern on 60 days' written notice to the Trust.

         Banking laws and regulations  currently prohibit a bank holding company
registered  under the Federal  Bank  Holding  Company Act of 1956 or any bank or
non-bank   affiliate  thereof  from  sponsoring,   organizing,   controlling  or
distributing the shares of a registered open-end investment company continuously
engaged in the issuance of its shares,  but such banking laws and regulations do
not prohibit such a holding  company or affiliate or banks generally from acting
as  investment  adviser,  transfer  agent  or  custodian  to such an  investment
company,  or from purchasing  shares of such a company as agent for and upon the
order  of  customers.  Northern  believes  that  it  may  perform  the  services
contemplated by its agreements with the Trust without  violation of such banking
laws or  regulations,  which are applicable to it. It should be noted,  however,
that future changes in either Federal or state statutes and regulations relating
to the permissible activities of banks and their subsidiaries or affiliates,  as
well as future  judicial  or  administrative  decisions  or  interpretations  of
current  and future  statutes  and  regulations,  could  prevent  Northern  from
continuing to perform such services for the Trust.

         Should future legislative,  judicial or administrative  action prohibit
or restrict  the  activities  of Northern in  connection  with the  provision of
services on behalf of the Trust, the Trust might be required to alter materially
or  discontinue  its  arrangements  with  Northern  and  change  its  method  of
operations.  It is not  anticipated,  however,  that any  change in the  Trust's
method of operations would affect the net asset value per share of the Portfolio
or  result  in a  financial  loss  to  any  shareholder.  Moreover,  if  current
restrictions preventing a bank from legally sponsoring,  organizing, controlling
or distributing shares of an open-end investment company were relaxed, the Trust
expects that  Northern and its  affiliates  would  consider the  possibility  of
offering to perform some or all of the  services now provided by First Data.  It
is not possible, of course, to predict whether or in what form such restrictions
might be relaxed or the terms upon which Northern and its affiliates might offer
to provide services for consideration by the Trustees.

         Under a Service Mark License  Agreement with the Trust,  Northern Trust
Corporation has agreed that the name "Northern  Institutional Funds" may be used
in connection with the Trust's business on a royalty-free basis.  Northern Trust
Corporation has reserved to itself the right to grant the non-exclusive right to
use the name "Northern  Institutional  Funds" to any other person. The Agreement
provides  that at such time as the  Agreement is no longer in effect,  the Trust
will cease using the name "Northern Institutional Funds."

Portfolio Transactions

         To the extent that the Portfolio  effects  brokerage  transactions with
First Data or any  broker/dealer  affiliated  directly  or  indirectly  with the
Investment  Adviser,  such transactions,  including the frequency  thereof,  the
receipt of any commissions payable in connection therewith, and the selection of
the  affiliated  broker/dealer  effecting  such  transactions,  will be fair and
reasonable to the shareholders of the Portfolio.

Portfolio Valuation

         U.S. and foreign  investments  held by the  Portfolio are valued at the
last quoted sales price on the exchange on which such  securities  are primarily
traded,  except that securities  listed on an exchange in the United Kingdom are
valued at the  average of the  closing  bid and ask  prices.  If any  securities
listed on a U.S.  securities  exchange are not traded on a valuation  date, they
will be valued at the last quoted bid price.  If securities  listed on a foreign
securities  exchange are not traded on a valuation  date, they will be valued at
the most recent  quoted  trade  price.  Securities  which are traded in the U.S.
over-the-counter  markets  are valued at the last  quoted bid price.  Securities
which are traded in the foreign  over-the-counter markets are valued at the last
sales price, except that such securities traded in the United Kingdom are valued
at the average of the closing bid and ask prices. Shares of investment companies
held by the Portfolio will be valued at their  respective net asset values.  Any
securities,  including restricted  securities,  for which current quotations are
not readily  available  are valued at fair value as  determined in good faith by
the  Investment  Adviser  under  the  supervision  of  the  Board  of  Trustees.
Short-term investments are valued at amortized cost which the Investment Adviser
has  determined,  pursuant to Board  authorization,  approximates  market value.
Securities may be valued on the basis of prices provided by independent  pricing
services  when such prices are believed to reflect the fair market value of such
securities.

Co-Administrators and Distributor

         Northern and FDISG,  4400 Computer  Drive,  Westborough,  Massachusetts
01581,  act as  co-administrators  for the Portfolio  under a  Co-Administration
Agreement  with the Trust.  Subject to the  general  supervision  of the Trust's
Board  of  Trustees,  Northern  and  FDISG  (the  "Co-Administrators")   provide
supervision of all aspects of the Trust's non-investment advisory operations and
perform various corporate secretarial, treasury and blue sky services, including
but not limited to: (a) maintaining  office facilities and furnishing  corporate
officers  for the Trust;  (b)  furnishing  data  processing  services,  clerical
services, and executive and administrative  services and standard stationery and
office supplies; (c) performing all functions ordinarily performed by the office
of a corporate treasurer,  and furnishing the services and facilities ordinarily
incident thereto,  such as expense accrual monitoring and payment of the Trust's
bills, preparing monthly reconciliation of the Trust's expense records, updating
projections of annual expenses,  preparing  materials for review by the Board of
Trustees and compliance  testing;  (d) preparing and  submitting  reports to the
Trust's   shareholders  and  the  SEC;  (e)  preparing  and  printing  financial
statements;  (f) preparing monthly Portfolio profile reports;  (g) preparing and
filing the Trust's  federal and state tax returns  (other than those required to
be filed by the Trust's custodian and transfer agent) and providing  shareholder
tax  information  to the Trust's  transfer  agent;  (h)  assisting  in marketing
strategy   and  product   development;   (i)   performing   oversight/management
responsibilities,  such as the  supervision  and  coordination of certain of the
Trust's service  providers;  (j) effecting and maintaining,  as the case may be,
the  registration  of shares of the Trust for sale under the securities  laws of
various  jurisdictions;  (k) assisting in maintaining corporate records and good
standing  status of the Trust in its state of  organization;  and (l) monitoring
the Trust's  arrangements  with respect to services provided by Servicing Agents
to  their  customers  who are the  beneficial  owners  of  shares,  pursuant  to
servicing agreements between the Trust and such Servicing Agents.

         Subject to the limitations  described  below, as compensation for their
administrative   services  and  the   assumption   of  related   expenses,   the
Co-Administrators  are entitled to a fee from the Portfolio,  computed daily and
payable  monthly,  at an annual rate of .10% of the average  daily net assets of
the  Portfolio.  The  Co-Administrators  will  reimburse  each Portfolio for its
expenses (including  administration fees payable to the  Co-Administrators,  but
excluding advisory fees, transfer agency fees,  servicing fees and extraordinary
expenses) which exceed on an annualized  basis .10% of the  Portfolio's  average
daily net assets.

         Unless sooner terminated, the Co-Administration Agreement will continue
in effect until April 30, 2001, and  thereafter  for  successive  one-year terms
with respect to the Portfolio,  provided that the Agreement is approved annually
(1) by the Board of Trustees or (2) by the vote of a majority of the outstanding
shares of the Portfolio (as defined below under "Other  Information"),  provided
that in either  event the  continuance  is also  approved  by a majority  of the
Trustees who are not parties to the Agreement and who are not interested persons
(as defined in the 1940 Act) of any party  thereto,  by vote cast in person at a
meeting called for the purpose of voting on such approval. The Co-Administration
Agreement is terminable at any time after April 30, 2001, without penalty by the
Trust  on at  least  60  days  written  notice  to the  Co-Administrators.  Each
Co-Administrator may terminate the  Co-Administration  Agreement with respect to
itself at any time  after  April 30,  2001  without  penalty on at least 60 days
written notice to the Trust and the other Co-Administrator.

         The Trust may terminate the Co-Administration  Agreement prior to April
30,  2001,  in the event  that the Trust or its  shareholders  incur  damages in
excess  of  $100,000  as a  result  of the  willful  misfeasance,  bad  faith or
negligence of the  Co-Administrators,  or the reckless disregard of their duties
under  the  Agreement.  The  Trust  may  also  terminate  the  Co-Administration
Agreement prior to April 30, 2001, in the event that the Co-Administrators  fail
to meet one of the performance standards set forth in the Agreement.

         The Trust has entered into a Distribution  Agreement  with FDDI,  under
which FDDI, as agent,  sells shares of the Portfolio on a continuous basis. FDDI
pays the cost of printing and  distributing  prospectuses to persons who are not
shareholders  of the Trust  and of sales  presentations,  advertising  and other
distribution  efforts.  No compensation is payable by the Trust to FDDI for such
distribution services.

         The Co-Administration Agreement provides that the Co-Administrators may
render similar services to others so long as their services under such Agreement
are not impaired thereby. The Co-Administration Agreement also provides that the
Trust will  indemnify  each  Co-Administrator  against all claims  except  those
resulting  from  the  willful  misfeasance,  bad  faith  or  negligence  of such
Co-Administrator,  or the  Co-Administrator's  breach  of  confidentiality.  The
Distribution  Agreement  provides  that the Trust will  indemnify  FDDI  against
certain liabilities  relating to untrue statements or omissions of material fact
except those  resulting from the reliance on information  furnished to the Trust
by  FDDI,  or  those  resulting  from  the  willful  misfeasance,  bad  faith or
negligence of FDDI, or FDDI's breach of confidentiality.  FDDI is a wholly-owned
subsidiary  of  FDISG,  which  is  a  wholly-owned   subsidiary  of  First  Data
Corporation.

Shareholder Servicing Plan

         As stated in the  Portfolio's  Prospectus,  Servicing  Agents may enter
into servicing agreements with the Trust under which they provide (or arrange to
have  provided)  support  services to their  Customers  or other  investors  who
beneficially own such shares in consideration of the Portfolio's  payment of not
more than .15% and .25% (on an annualized  basis) of the average daily net asset
value of the  Class C and D  Shares,  respectively,  beneficially  owned by such
Customers or investors.

         Services  provided by or arranged  to be provided by  Servicing  Agents
under their servicing  agreements may include:  (1) establishing and maintaining
separate  account  records  of  Customers  or  other  investors;  (2)  providing
Customers or other  investors with a service that invests their assets in shares
of certain  classes  pursuant to specific or  pre-authorized  instructions,  and
assistance  with  new  account  applications;  (3)  aggregating  and  processing
purchase and redemption requests for shares of certain classes from Customers or
other investors,  and placing  purchase and redemption  orders with the Transfer
Agent;  (4) issuing  confirmations to Customers or other investors in accordance
with  applicable  law;  (5)  arranging  for the  timely  transmission  of  funds
representing  the net purchase  price or  redemption  proceeds;  (6)  processing
dividend  payments on behalf of  Customers  or other  investors;  (7)  providing
information periodically to Customers or other investors showing their positions
in shares;  (8)  responding to Customer or other investor  inquiries  (including
requests for prospectuses), and complaints relating to the services performed by
the  Servicing  Agents;  (9) acting as liaison with respect to all inquiries and
complaints  from Customers and other investors  relating to errors  committed by
the Trust or its  agents,  and  other  matters  pertaining  to the  Trust;  (10)
providing or arranging for another person to provide  subaccounting with respect
to shares of certain classes beneficially owned by Customers or other investors;
(11) if required by law,  forwarding  shareholder  communications from the Trust
(such  as  proxy  statements  and  proxies,   shareholder  reports,  annual  and
semi-annual financial statements and dividend,  distribution and tax notices) to
Customers and other investors;  (12) providing such office space, facilities and
personnel  as may be  required to perform  their  services  under the  servicing
agreements;  (13) maintaining  appropriate  management reporting and statistical
information;  (14) paying expenses related to the preparation of educational and
other  explanatory  materials in  connection  with the  development  of investor
services; (15) developing and monitoring investment programs; and (16) providing
such other similar  services as the Trust may  reasonably  request to the extent
the Servicing Agents are permitted to do so under applicable statutes, rules and
regulations.

         The Trust's  agreements  with  Servicing  Agents are governed by a Plan
(called the "Shareholder  Servicing Plan"),  which has been adopted by the Board
of Trustees.  Pursuant to the Shareholder  Servicing Plan, the Board of Trustees
will review, at least quarterly,  a written report of the amounts expended under
the Trust's  agreements  with  Servicing  Agents and the  purposes for which the
expenditures were made. In addition, the arrangements with Servicing Agents must
be  approved  annually  by a  majority  of the Board of  Trustees,  including  a
majority of the  Trustees  who are not  "interested  persons"  of the Trust,  as
defined in the 1940 Act,  and have no direct or indirect  financial  interest in
such arrangements.

         The Board of Trustees  has  approved the  arrangements  with  Servicing
Agents based on information  provided by the Trust's  service  contractors  that
there  is a  reasonable  likelihood  that  the  arrangements  will  benefit  the
Portfolio and its shareholders by affording the Portfolio greater flexibility in
connection  with the servicing of the accounts of the  beneficial  owners of its
shares in an efficient manner.

Counsel and Auditors

         Drinker Biddle & Reath LLP, with offices at One Logan Square,  18th and
Cherry Streets,  Philadelphia,  Pennsylvania 19103-6996, serve as counsel to the
Trust.

         Ernst & Young LLP, independent auditors,  233 S. Wacker Drive, Chicago,
Illinois  60606,  have been  selected as  auditors of the Trust.  In addition to
audit  services,  Ernst & Young LLP reviews  the  Trust's  Federal and state tax
returns,  and provides  consultation  and  assistance  on  accounting,  internal
control and related matters.

In-Kind Purchases and Redemptions

         Payment for shares of the Portfolio may, in the discretion of Northern,
be made in the form of  securities  that  are  permissible  investments  for the
Portfolio as described in the  Prospectus.  For further  information  about this
form of payment,  contact  Northern.  In connection  with an in-kind  securities
payment, the Portfolio will require,  among other things, that the securities be
valued on the day of purchase in accordance with the pricing methods used by the
Portfolio and that the Portfolio  receive  satisfactory  assurances that it will
have  good and  marketable  title to the  securities  received  by it;  that the
securities  be in proper form for transfer to the  Portfolio;  and that adequate
information be provided  concerning the basis and other tax matters  relating to
the securities.

         Although  the  Portfolio  generally  will  redeem  shares  in cash,  it
reserves the right to pay  redemptions by a  distribution  in-kind of securities
(instead of cash) from the Portfolio.  The securities  distributed in-kind would
be readily marketable and would be valued for this purpose using the same method
employed  in  calculating  the  Portfolio's  net  asset  value per  share.  If a
shareholder  receives redemption proceeds in-kind, the shareholder should expect
to incur  transaction  costs upon the disposition of the securities  received in
the redemption.

                             PERFORMANCE INFORMATION

         The  performance  of a class of shares of the Portfolio may be compared
to those of other mutual funds with similar  investment  objectives and to bond,
stock and other relevant indices or to rankings prepared by independent services
or other  financial or industry  publications  that monitor the  performance  of
mutual funds. For example,  the performance of a class of shares may be compared
to data prepared by Lipper Analytical Services, Inc. or other independent mutual
fund reporting services. In addition, the performance of a class may be compared
to the Russell 2000 Index or the Dow Jones Industrial Average.  Performance data
as  reported  in  national  financial   publications  such  as  Money  Magazine,
Morningstar,  Forbes,  Barron's, The Wall Street Journal and The New York Times,
or in publications of a local or regional nature,  may also be used in comparing
the performance of a class of shares of the Portfolio.

         The Portfolio  calculates its total return on an "average  annual total
return"  basis for various  periods.  Average  annual total return  reflects the
average annual percentage change in value of an investment in the Portfolio over
the measuring  period.  Total return for the Portfolio may also be calculated on
an "aggregate  total return" basis for various  periods.  Aggregate total return
reflects the total percentage  change in value over the measuring  period.  Both
methods of calculating  total return reflect  changes in the price of the shares
and  assume  that any  dividends  and  capital  gain  distributions  made by the
Portfolio during the period are reinvested in the shares of the Portfolio.  When
considering average total return figures for periods longer than one year, it is
important to note that the annual total return of the Portfolio for any one year
in the  period  might  have been more or less than the  average  for the  entire
period. The Portfolio may also advertise from time to time the total return on a
year-by-year or other basis for various specific periods by means of quotations,
charts, graphs or schedules.

         The Portfolio  calculates its "average annual total return" for a class
of shares by  determining  the average annual  compounded  rate of return during
specified  periods  that  equates  the  initial  amount  invested  to the ending
redeemable value of such investment according to the following formula:


               T=[(ERV/P)power of 1/n] -1


Where:                           T =  average annual total return;

                                 ERV       =  ending   redeemable   value  of  a
                                           hypothetical  $1,000  payment made at
                                           the  beginning of the 1, 5 or 10 year
                                           (or other)  periods at the end of the
                                           applicable  period  (or a  fractional
                                           portion thereof);

                                 P =       hypothetical initial payment of
                                           $1,000; and

                                 n =       period covered by the computation,
                                           expressed in years.

         The Portfolio  calculates its  "aggregate  total return" for a class of
shares by determining the aggregate  compounded rates of return during specified
periods  that  likewise  equate  the  initial  amount  invested  to  the  ending
redeemable value of such investment. The formula for calculating aggregate total
return is as follows:

          Aggregate Total Return = T=[(ERV/P)]-1

         The calculations of "aggregate total return" will be made assuming that
(1)  all  dividends  and  capital  gain  distributions  are  reinvested  on  the
reinvestment  dates at the price per share existing on the reinvestment date and
(2) all recurring  fees charged to all  shareholder  accounts are included.  The
ending  redeemable  value  (variable  "ERV" in the  formula)  is  determined  by
assuming complete  redemption of the hypothetical  investment after deduction of
all nonrecurring charges at the end of the measuring period.

           The yield of a class of shares of the Portfolio is computed  based on
           the net  income of such class  during a 30-day (or one month)  period
           (which period will be identified  in connection  with the  particular
           yield  quotations).  More  specifically,  the Portfolio's yield for a
           class of shares is computed  by dividing  the per share net income of
           the  class  during a 30-day  (or one  month)  period by the net asset
           value per share on the last day of the  period  and  annualizing  the
           result on a semi-annual basis.

         The Portfolio's  30-day (or one month) standard yield is calculated for
each class in accordance with the method prescribed by the SEC for mutual funds:

                        YIELD = 2{[((a-b/cd)+1)power of 6] -1}

Where:                           a =    dividends and interest earned during
                                        the period;

                                 b =    expenses accrued for the period (net of
                                        reimbursements);

                                 c =     average  daily  number  of  shares
                                        outstanding    during    the   period
                                        entitled to receive dividends; and

                                 d =    net  asset  value  per share on the
                                        last day of the period.

         Because  of the  different  servicing  fees and  transfer  agency  fees
payable  with respect to Class A, C and D Shares in the  Portfolio,  performance
quotations  for shares of Class C and D of the Portfolio  will be lower than the
quotations for Class A Shares of the Portfolio, which will not bear any fees for
shareholder support services and will bear minimal transfer agency fees.

         The  performance  of each class of shares of the  Portfolio is based on
historical  earnings,  will  fluctuate  and is not  intended to indicate  future
performance.  The  investment  return and principal  value of an investment in a
class will  fluctuate  so that when  redeemed,  shares may be worth more or less
than their original cost.  Performance  information  may not provide a basis for
comparison with bank deposits and other  investments which provide a fixed yield
for a stated  period of time.  Total  return data should also be  considered  in
light  of the  risks  associated  with  the  Portfolio's  composition,  quality,
maturity,  operating  expenses  and  market  conditions.  Any  fees  charged  by
Institutions  directly to their Customer accounts in connection with investments
in  the  Portfolio  will  not  be  included  in   calculations   of  performance
information.

TAXES

         The  following   summarizes   certain   additional  tax  considerations
generally affecting the Portfolio and its shareholders that are not described in
the Portfolio's Prospectus. No attempt is made to present a detailed explanation
of the tax treatment of the Portfolio or its  shareholders,  and the  discussion
here and in the  applicable  Prospectus  is not  intended  as a  substitute  for
careful tax planning. Potential investors should consult their tax advisers with
specific reference to their own tax situations.

GENERAL

         The  Portfolio  will  elect  to  be  taxed  separately  as a  regulated
investment company (a "RIC"). To qualify as a RIC, the Portfolio  generally must
distribute  an amount equal to at least 90% of its  investment  company  taxable
income (net investment income and the excess of net short-term capital gain over
net  long-term  capital  loss),  if  any,  for  each  year  (the   "Distribution
Requirement") and satisfy certain other requirements.  The Portfolio must derive
at least 90% of its gross income from dividends, interest, certain payments with
respect  to  securities  loans and gains from the sale or other  disposition  of
stock or securities  or foreign  currencies,  or from other income  derived with
respect to its business of investing in such stock,  securities  or  currencies.
Also, at the close of each quarter of the taxable year, it is generally required
that at least 50% of the value of the  Portfolio's  assets must  consist of cash
and cash  items,  U.S.  Government  securities,  securities  of  other  RICs and
securities  of other  issuers (as to which the  Portfolio  has not invested more
than 5% of the value of its total assets in  securities of such issuer and as to
which  the  Portfolio  does not hold  more  than 10% of the  outstanding  voting
securities of such issuer), and no more than 25% of the value of the Portfolio's
total  assets may be invested in the  securities  of any one issuer  (other than
U.S.  Government   securities  and  securities  of  other  regulated  investment
companies), or in two or more issuers which the Portfolio controls and which are
engaged in the same or similar  trades or businesses.  The Portfolio  intends to
comply with these RIC requirements.

         If for any taxable year the Portfolio were not to qualify as a RIC, all
of its taxable income would be subject to tax at regular corporate rates without
any  deduction  for   distributions   to   shareholders.   In  such  event,  all
distributions  by the  Portfolio  would be taxable to  shareholders  as ordinary
income to the extent of the  Portfolio's  current and  accumulated  earnings and
profits, and would be eligible for the dividends-received  deduction in the case
of corporate shareholders .

         The Internal Revenue Code imposes a nondeductible 4% excise tax on RICs
that fail  currently to distribute an amount equal to specified  percentages  of
their  ordinary  taxable  income and capital gain net income  (excess of capital
gains  over  capital   losses).   The  Portfolio   intends  to  make  sufficient
distributions or deemed distributions of its ordinary taxable income and capital
gain net income each calendar  year to avoid  liability for this excise tax. The
Portfolio also intends to make sufficient  distributions or deemed distributions
each year to avoid liability for corporate  income tax. If the Portfolio were to
fail to make sufficient  distributions,  it could be liable for corporate income
tax and for excise tax.

           The Trust will be required in certain  cases to withhold and remit to
           the United States  Treasury 31% of taxable  dividends or 31% of gross
           sale proceeds paid to any  shareholder (i) who has provided either an
           incorrect tax identification  number or no number at all, (ii) who is
           subject to backup  withholding  by the Internal  Revenue  Service for
           prior  failure to report the receipt of taxable  interest or dividend
           income  properly,  or (iii) who has  failed to  certify to the Trust,
           when required to do so, that he is not subject to backup  withholding
           or that he is an "exempt recipient."

Foreign Investors

         Foreign shareholders  generally will be subject to U.S. withholding tax
at a rate of 30% (or a lower treaty rate, if applicable) on distributions by the
Portfolio of net investment  income,  other ordinary income,  and the excess, if
any, of net  short-term  capital  gain over net  long-term  capital loss for the
year,  regardless of the extent,  if any, to which the income or gain is derived
from  non-U.S.   investments  of  the  Portfolio.   For  this  purpose,  foreign
shareholders include individuals other than U.S. citizens, residents and certain
nonresident aliens, and foreign corporations,  partnerships, trusts and estates.
A  foreign  shareholder  generally  will  not  be  subject  to  U.S.  income  or
withholding  tax in respect of proceeds from or gain on the redemption of shares
or in respect of capital gain dividends (i.e.,  dividends  attributable to long-
term  capital  gains of the  Portfolio),  provided  such  shareholder  submits a
statement,  signed under penalties of perjury,  attesting to such  shareholder's
exempt status. Different tax consequences apply to a foreign shareholder engaged
in a U.S.  trade or  business  or present in the U.S.  for 183 days or more in a
year. Foreign  shareholders should consult their tax advisers regarding the U.S.
and foreign tax consequences of investing in the Portfolio.


Conclusion

         The foregoing  discussion is based on Federal tax laws and  regulations
which  are in  effect on the date of this  Additional  Statement.  Such laws and
regulations may be changed by legislative or  administrative  action. No attempt
is made to present a detailed  explanation of the tax treatment of the Portfolio
or its  shareholders,  and the  discussion  here  and in the  Prospectus  is not
intended as a substitute for careful tax planning.  Shareholders  are advised to
consult their tax advisers with specific  reference to their own tax  situation,
including the application of state and local taxes.

         Although the  Portfolio  expects to qualify as a RIC and to be relieved
of all or  substantially  all Federal  taxes,  depending  upon the extent of its
activities  in states and  localities  in which its offices are  maintained,  in
which its  agents  or  independent  contractors  are  located  or in which it is
otherwise deemed to be conducting business,  the Portfolio may be subject to the
tax laws of such states or localities.

DESCRIPTION OF SHARES

           The Trust Agreement permits the Trust's Board of Trustees to issue an
           unlimited number of full and fractional shares of beneficial interest
           of one or more separate series representing  interests in one or more
           investment  portfolios.  The Trustees may hereafter  create series in
           addition to the Trust's  nineteen  existing  series,  which represent
           interests in the Trust's nineteen  respective  portfolios.  The Trust
           Agreement   also  permits  the  Board  of  Trustees  to  classify  or
           reclassify any unissued shares into classes within a series. Pursuant
           to such  authority,  the Trustees have  authorized the issuance of an
           unlimited  number of shares of beneficial  interest in three separate
           classes of shares in the Portfolio: Class A, C and D Shares.

         Under the terms of the Trust Agreement,  each share of the Portfolio is
without par value,  represents an equal proportionate  interest in the Portfolio
with each other share of its class in the same Portfolio and is entitled to such
dividends and  distributions out of the income belonging to the Portfolio as are
declared by the Trustees. Upon any liquidation of the Portfolio, shareholders of
each class of the  Portfolio  are  entitled  to share pro rata in the net assets
belonging  to that  class  available  for  distribution.  Shares do not have any
preemptive or  conversion  rights.  The right of  redemption is described  under
"About Your Account -- Selling Shares" in the Prospectus. In addition,  pursuant
to the terms of the 1940 Act, the right of a  shareholder  to redeem  shares and
the date of payment by the  Portfolio  may be suspended for more than seven days
(a) for any period  during  which the New York Stock  Exchange is closed,  other
than the customary weekends or holidays, or trading in the markets the Portfolio
normally  utilizes is closed or is  restricted  as  determined  by the SEC,  (b)
during any  emergency,  as determined by the SEC, as a result of which it is not
reasonably  practicable for the Portfolio to dispose of instruments  owned by it
or fairly to determine the value of its net assets, or (c) for such other period
as the SEC may by order permit for the  protection  of the  shareholders  of the
Portfolio.  The  Trust may also  suspend  or  postpone  the  recordation  of the
transfer of its shares upon the  occurrence of any of the foregoing  conditions.
In addition,  shares of the Portfolio are redeemable at the unilateral option of
the Trust if the Trustees  determine in their sole discretion that failure to so
redeem  may  have  material  adverse  consequences  to the  shareholders  of the
Portfolio. Shares when issued as described in the Prospectus are validly issued,
fully  paid and  nonassessable,  except as stated  below.  In the  interests  of
economy and convenience,  certificates  representing shares of the Portfolio are
not issued.

         The proceeds  received by the  Portfolio  for each issue or sale of its
shares, and all net investment income, realized and unrealized gain and proceeds
thereof, subject only to the rights of creditors, will be specifically allocated
to and constitute the underlying assets of the Portfolio.  The underlying assets
of the Portfolio will be segregated on the books of account, and will be charged
with the liabilities  and with a share of the general  liabilities of the Trust.
Expenses with respect to the  Portfolio are normally  allocated in proportion to
the net asset value of the Portfolio except where allocations of direct expenses
can otherwise be fairly made.

         Rule 18f-2 under the 1940 Act provides that any matter  required by the
provisions  of the  1940  Act or  applicable  state  law,  or  otherwise,  to be
submitted to the holders of the outstanding  voting  securities of an investment
company  such as the Trust  shall not be deemed to have been  effectively  acted
upon unless approved by the holders of a majority of the  outstanding  shares of
each investment  portfolio affected by such matter.  Rule 18f-2 further provides
that an investment  portfolio  shall be deemed to be affected by a matter unless
the  interests  of each  investment  portfolio  in the matter are  substantially
identical  or the  matter  does  not  affect  any  interest  of  the  investment
portfolio.  Under the Rule, the approval of an investment  advisory agreement or
any change in a fundamental  investment  policy would be effectively  acted upon
with respect to an  investment  portfolio  only if approved by a majority of the
outstanding shares of such investment portfolio. However, the Rule also provides
that  the  ratification  of the  appointment  of  independent  accountants,  the
approval of principal  underwriting  contracts  and the election of Trustees are
exempt  from  the  separate  voting  requirements  stated  above.  In  addition,
shareholders  of each of the classes in a particular  investment  portfolio have
equal  voting  rights  except  that  only  shares  of a  particular  class of an
investment  portfolio will be entitled to vote on matters submitted to a vote of
shareholders  (if any) relating to shareholder  servicing  expenses and transfer
agency fees that are payable by that class.

         The Trust is not required to hold annual meetings of  shareholders  and
does  not  intend  to  hold  such  meetings.  In the  event  that a  meeting  of
shareholders is held, each share of the Trust will be entitled, as determined by
the Trustees without the vote or consent of shareholders, either to one vote for
each share or to one vote for each dollar of net asset value represented by such
shares on all matters  presented  to  shareholders,  including  the  election of
Trustees  (this method of voting being  referred to as  "dollar-based  voting").
However,  to the extent required by the 1940 Act or otherwise  determined by the
Trustees,  series and classes of the Trust will vote separately from each other.
Shareholders of the Trust do not have  cumulative  voting rights in the election
of Trustees  and,  accordingly,  the  holders of more than 50% of the  aggregate
voting  power of the Trust may elect all of the  Trustees,  irrespective  of the
vote of the other  shareholders.  Meetings of  shareholders of the Trust, or any
series or class thereof, may be called by the Trustees, certain officers or upon
the written  request of holders of 10% or more of the shares entitled to vote at
such  meeting.  To the  extent  required  by  law,  the  Trust  will  assist  in
shareholder  communications in connection with a meeting called by shareholders.
The  shareholders  of the Trust will have voting rights only with respect to the
limited  number of  matters  specified  in the Trust  Agreement  and such  other
matters as the Trustees may determine or may be required by law.

         The  Trust  Agreement  authorizes  the  Trustees,  without  shareholder
approval  (except as stated in the next  paragraph),  to cause the Trust, or any
series thereof, to merge or consolidate with any corporation, association, trust
or  other  organization  or sell or  exchange  all or  substantially  all of the
property  belonging  to the  Trust,  or any series  thereof.  In  addition,  the
Trustees, without shareholder approval, may adopt a "master-feeder" structure by
investing  substantially  all of the  assets  of a  series  of the  Trust in the
securities of another open-end investment company or pooled portfolio.

         The Trust  Agreement also  authorizes the Trustees,  in connection with
the merger,  consolidation,  termination or other reorganization of the Trust or
any series or class, to classify the  shareholders of any class into one or more
separate groups and to provide for the different treatment of shares held by the
different groups, provided that such merger, consolidation, termination or other
reorganization  is approved by a majority of the outstanding  voting  securities
(as  defined  in the  1940  Act) of  each  group  of  shareholders  that  are so
classified.

         The Trust  Agreement  permits the Trustees to amend the Trust Agreement
without a shareholder vote. However, shareholders of the Trust have the right to
vote on any  amendment  (i) that would  adversely  affect  the voting  rights of
shareholders; (ii) that is required by law to be approved by shareholders; (iii)
that would amend the voting provisions of the Trust Agreement;  or (iv) that the
Trustees determine to submit to shareholders.

         The Trust  Agreement  permits  the  termination  of the Trust or of any
series or class of the Trust (i) by a majority of the affected shareholders at a
meeting of shareholders of the Trust,  series or class; or (ii) by a majority of
the Trustees without  shareholder  approval if the Trustees  determine that such
action is in the best interest of the Trust or its shareholders. The factors and
events that the  Trustees  may take into  account in making  such  determination
include (i) the  inability  of the Trust or any series or class to maintain  its
assets at an appropriate size; (ii) changes in laws or regulations governing the
Trust, or any series or class thereof,  or affecting assets of the type in which
it  invests;  or (iii)  economic  developments  or trends  having a  significant
adverse impact on their business or operations.

         Under  the  Delaware   Business   Trust  Act  (the   "Delaware   Act"),
shareholders  are not  personally  liable  for  obligations  of the  Trust.  The
Delaware  Act  entitles  shareholders  of the  Trust to the same  limitation  of
liability as is available to  shareholders of private  for-profit  corporations.
However,  no  similar  statutory  or other  authority  limiting  business  trust
shareholder  liability exists in many other states.  As a result,  to the extent
that the Trust or a shareholder is subject to the jurisdiction of courts in such
other  states,  those  courts may not apply  Delaware  law and may  subject  the
shareholders to liability. To offset this risk, the Trust Agreement (i) contains
an express  disclaimer of  shareholder  liability for acts or obligations of the
Trust and requires that notice of such  disclaimer  be given in each  agreement,
obligation and instrument  entered into or executed by the Trust or its Trustees
and (ii)  provides for  indemnification  out of the  property of the  applicable
series  of  the  Trust  of  any  shareholder  held  personally  liable  for  the
obligations  of the Trust solely by reason of being or having been a shareholder
and not because of the shareholder's acts or omissions or for some other reason.
Thus,  the risk of a  shareholder  incurring  financial  loss  beyond his or her
investment because of shareholder liability is limited to circumstances in which
all of the following factors are present:  (1) a court refuses to apply Delaware
law;  (2) the  liability  arises  under  tort  law or,  if not,  no  contractual
limitation of liability is in effect; and (3) the applicable series of the Trust
is unable to meet its obligations.

         The Trust  Agreement  provides  that the Trustees will not be liable to
any person other than the Trust or a shareholder  and that a Trustee will not be
liable  for  any act as a  Trustee.  However,  nothing  in the  Trust  Agreement
protects a Trustee  against any liability to which he or she would  otherwise be
subject  by reason of  willful  misfeasance,  bad  faith,  gross  negligence  or
reckless  disregard of the duties  involved in the conduct of his or her office.
The Trust  Agreement  provides for  indemnification  of  Trustees,  officers and
agents of the  Trust  unless  the  recipient  is  liable  by  reason of  willful
misfeasance,  bad faith,  gross  negligence or reckless  disregard of the duties
involved in the conduct of such person's office.

         The  Trust  Agreement  provides  that  each  shareholder,  by virtue of
becoming such,  will be held to have expressly  assented and agreed to the terms
of the Trust Agreement and to have become a party thereto.

         In addition to the  requirements  of Delaware law, the Trust  Agreement
provides that a shareholder of the Trust may bring a derivative action on behalf
of the Trust only if the following conditions are met: (a) shareholders eligible
to bring such derivative  action under Delaware law who hold at least 10% of the
outstanding  shares of the Trust, or 10% of the outstanding shares of the series
or class to which such action relates, must join in the request for the Trustees
to commence  such  action;  and (b) the  Trustees  must be afforded a reasonable
amount of time to consider such shareholder request and to investigate the basis
of such claim. The Trust Agreement also provides that no person,  other than the
Trustees,  who is not a  shareholder  of a  particular  series or class shall be
entitled to bring any derivative  action,  suit or other proceeding on behalf of
or with respect to such series or class. The Trustees will be entitled to retain
counsel or other  advisers  in  considering  the merits of the  request  and may
require an undertaking by the shareholders  making such request to reimburse the
Trust  for the  expense  of any such  advisers  in the event  that the  Trustees
determine not to bring such action.

         The Trustees may appoint separate  Trustees with respect to one or more
series or classes of the Trust's shares (the "Series  Trustees").  To the extent
provided by the Trustees in the appointment of Series Trustees,  Series Trustees
(a) may,  but are not  required  to, serve as Trustees of the Trust or any other
series  or class of the  Trust;  (b) may  have,  to the  exclusion  of any other
Trustee of the Trust, all the powers and authorities of Trustees under the Trust
Agreement with respect to such series or class;  and/or (c) may have no power or
authority  with  respect  to any other  series or class.  The  Trustees  are not
currently considering the appointment of Series Trustees for the Trust.

         As of July  31,  1999,  substantially  all of the  Trust's  portfolios'
outstanding  shares  were held of  record by  Northern  for the  benefit  of its
customers and the customers of its affiliates and correspondent  banks that have
invested in the  portfolios.  As of the same date,  Northern  possessed  sole or
shared voting and/or  investment power for its customer accounts with respect to
less  than 10% of the  Trust's  outstanding  shares.  As of the same  date,  the
Trust's Trustees and officers as a group owned  beneficially less than 1% of the
outstanding shares of each class of each portfolio.

                                OTHER INFORMATION

         The  Prospectus  and this  Additional  Statement do not contain all the
information included in the Registration  Statement filed with the SEC under the
Securities  Act of 1933 with  respect to the  securities  offered by the Trust's
Prospectus.  Certain  portions of the  Registration  Statement have been omitted
from the  Prospectus  and this  Additional  Statement  pursuant to the rules and
regulations of the SEC. The Registration  Statement including the exhibits filed
therewith may be examined at the office of the SEC in Washington, D.C.

         The  Portfolio is  responsible  for the payment of its  expenses.  Such
expenses include, without limitation,  the fees and expenses payable to Northern
and First Data,  brokerage fees and  commissions,  fees for the  registration or
qualification  of  Portfolio  shares  under  Federal or state  securities  laws,
expenses  of the  organization  of the  Portfolio,  taxes,  interest,  costs  of
liability insurance, fidelity bonds, indemnification or contribution, any costs,
expenses  or losses  arising  out of any  liability  of, or claim for damages or
other relief asserted  against,  the Trust for violation of any law, legal,  tax
and auditing  fees and  expenses,  servicing  fees,  expenses of  preparing  and
printing prospectuses,  statements of additional  information,  proxy materials,
reports and notices and the printing and distributing of the same to the Trust's
shareholders  and  regulatory  authorities,  compensation  and  expenses  of its
Trustees,  expenses for industry  organizations  such as the Investment  Company
Institute,  miscellaneous  expenses and  extraordinary  expenses incurred by the
Trust.

         The term  "majority of the  outstanding  shares" of either the Trust or
the  Portfolio  means,  with respect to the approval of an  investment  advisory
agreement or a change in a fundamental investment policy, the vote of the lesser
of (i) 67% or more of the  shares of the  Trust or the  Portfolio  present  at a
meeting,  if the holders of more than 50% of the outstanding shares of the Trust
or the Portfolio are present or represented  by proxy,  or (ii) more than 50% of
the outstanding shares of the Trust or the Portfolio.

         Statements  contained in the Prospectus or in this Additional Statement
as to the  contents  of any  contract  or other  documents  referred  to are not
necessarily complete, and in each instance reference is made to the copy of such
contract or other document filed as an exhibit to the Registration  Statement of
which  the  Prospectus  and this  Additional  Statement  form a part,  each such
statement being qualified in all respects by such reference.




<PAGE>




A-7
                                   APPENDIX A

COMMERCIAL PAPER RATINGS

A Standard & Poor's ("S&P")  commercial paper rating is a current  assessment of
the likelihood of timely payment of debt having an original  maturity of no more
than 365 days. The following  summarizes the rating  categories used by Standard
and Poor's for commercial paper:

           "A-1" - Obligations are rated in the highest category indicating that
           the  obligor's  capacity  to meet  its  financial  commitment  on the
           obligation is strong.  Within this category,  certain obligations are
           designated  with a plus sign (+). This  indicates  that the obligor's
           capacity to meet its  financial  commitment on these  obligations  is
           extremely strong.

         "A-2" -  Obligations  are  somewhat  more  susceptible  to the  adverse
         effects  of changes  in  circumstances  and  economic  conditions  than
         obligations  in  higher  rating  categories.   However,  the  obligor's
         capacity  to  meet  its  financial  commitment  on  the  obligation  is
         satisfactory.

         "A-3" - Obligations  exhibit adequate protection  parameters.  However,
         adverse economic  conditions or changing  circumstances are more likely
         to lead to a weakened  capacity  of the  obligor to meet its  financial
         commitment on the obligation.

         "B" -  Obligations  are  regarded  as  having  significant  speculative
         characteristics.  The obligor  currently  has the  capacity to meet its
         financial commitment on the obligation; however, it faces major ongoing
         uncertainties which could lead to the obligor's  inadequate capacity to
         meet its financial commitment on the obligation.

         "C" -  Obligations  are  currently  vulnerable  to  nonpayment  and are
         dependent upon favorable business,  financial,  and economic conditions
         for the obligor to meet its financial commitment on the obligation.

         "D" - Obligations  are in payment  default.  The "D" rating category is
         used when payments on an  obligation  are not made on the date due even
         if the  applicable  grace period has not  expired,  unless S&P believes
         that such  payments  will be made  during  such grace  period.  The "D"
         rating  will be used upon the filing of a  bankruptcy  petition  or the
         taking  of  a  similar   action  if  payments  on  an  obligation   are
         jeopardized.

Moody's commercial paper ratings are opinions of the ability of issuers to repay
punctually  senior debt obligations not having an original maturity in excess of
one  year,  unless  explicitly  noted.  The  following   summarizes  the  rating
categories used by Moody's for commercial paper:

         "Prime-1"  -  Issuers  (or  supporting  institutions)  have a  superior
         ability for repayment of senior  short-term debt  obligations.  Prime-1
         repayment  ability  will often be  evidenced  by many of the  following
         characteristics:   leading   market   positions   in   well-established
         industries;  high  rates  of  return  on funds  employed;  conservative
         capitalization structure 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.

         "Prime-2" - Issuers (or supporting  institutions) have a strong ability
         for repayment of senior short-term debt obligations. This will normally
         be evidenced by many of the characteristics cited above but to a lesser
         degree.  Earnings trends and coverage ratios,  while sound, may be more
         subject  to  variation.  Capitalization  characteristics,  while  still
         appropriate,  may  be  more  affected  by  external  conditions.  Ample
         alternate liquidity is maintained.

         "Prime-3" - Issuers (or  supporting  institutions)  have an  acceptable
         ability for repayment of senior short-term debt obligations. The effect
         of  industry  characteristics  and  market  compositions  may  be  more
         pronounced.  Variability  in earnings and  profitability  may result in
         changes in the level of debt  protection  measurements  and may require
         relatively high financial  leverage.  Adequate  alternate  liquidity is
         maintained.

         "Not Prime" - Issuers do not fall within any of the Prime rating
          categories.

The three rating  categories of Duff & Phelps for  investment  grade  commercial
paper and  short-term  debt are "D-1,"  "D-2" and "D-3."  Duff & Phelps  employs
three  designations,  "D-1+,"  "D-1"  and  "D-1-,"  within  the  highest  rating
category.  The following  summarizes the rating categories used by Duff & Phelps
for commercial paper:

          "D-1+" - Debt  possesses  the  highest  certainty  of timely  payment.
     Short-term liquidity, including internal operating factors and/or access to
     alternative  sources  of funds,  is  outstanding,  and safety is just below
     risk-free U.S. Treasury short-term obligations.

         "D-1" - Debt possesses very high certainty of timely payment. Liquidity
         factors are  excellent  and  supported by good  fundamental  protection
         factors. Risk factors are minor.

         "D-1-" - Debt  possesses high  certainty of timely  payment.  Liquidity
         factors  are  strong  and  supported  by  good  fundamental  protection
         factors. Risk factors are very small.

         "D-2" - Debt  possesses  good  certainty of timely  payment.  Liquidity
         factors and company  fundamentals  are sound.  Although ongoing funding
         needs may  enlarge  total  financing  requirements,  access to  capital
         markets is good. Risk factors are small.

         "D-3" - Debt  possesses  satisfactory  liquidity  and other  protection
         factors qualify issues as to investment  grade. Risk factors are larger
         and  subject  to  more  variation.   Nevertheless,  timely  payment  is
         expected.

         "D-4"  -  Debt  possesses   speculative   investment   characteristics.
         Liquidity  is not  sufficient  to  insure  against  disruption  in debt
         service.  Operating  factors and market access may be subject to a high
         degree of variation.

         "D-5" - Issuer has failed to meet scheduled  principal  and/or interest
payments.

Fitch IBCA short-term  ratings apply to debt obligations that have time horizons
of less  than 12  months  for most  obligations,  or up to three  years for U.S.
public finance securities.  The following  summarizes the rating categories used
by Fitch IBCA for short-term obligations:

         "F1" - Securities possess the highest credit quality.  This designation
         indicates  the  strongest  capacity  for timely  payment  of  financial
         commitments  and may  have an added  "+" to  denote  any  exceptionally
         strong credit feature.

         "F2"  -  Securities  possess  good  credit  quality.  This  designation
         indicates  a  satisfactory  capacity  for timely  payment of  financial
         commitments, but the margin of safety is not as great as in the case of
         the higher ratings.

         "F3"  -  Securities  possess  fair  credit  quality.  This  designation
         indicates that the capacity for timely payment of financial commitments
         is  adequate;  however,  near-term  adverse  changes  could result in a
         reduction to non-investment grade.

         "B" - Securities possess  speculative credit quality.  This designation
         indicates minimal capacity for timely payment of financial commitments,
         plus  vulnerability  to  near-term  adverse  changes in  financial  and
         economic conditions.

         "C" - Securities possess high default risk. This designation  indicates
         that  default is a real  possibility  and that the capacity for meeting
         financial  commitments  is solely  reliant upon a sustained,  favorable
         business and economic environment.

         "D" - Securities are in actual or imminent payment default.

Thomson  BankWatch  short-term  ratings  assess the  likelihood  of an  untimely
payment of principal and interest of debt instruments  with original  maturities
of one year or less.  The  following  summarizes  the  ratings  used by  Thomson
BankWatch:

         "TBW-1"  - This  designation  represents  Thomson  BankWatch's  highest
         category  and  indicates  a very high  likelihood  that  principal  and
         interest will be paid on a timely basis.

         "TBW-2"   -   This   designation    represents   Thomson    BankWatch's
         second-highest  category and indicates  that while the degree of safety
         regarding  timely  repayment of principal  and interest is strong,  the
         relative degree of safety is not as high as for issues rated "TBW-1."

         "TBW-3"  -  This  designation  represents  Thomson  BankWatch's  lowest
         investment-grade  category and indicates  that while the  obligation is
         more susceptible to adverse  developments  (both internal and external)
         than those with higher ratings,  the capacity to service  principal and
         interest in a timely fashion is considered adequate.

         "TBW-4" - This designation represents Thomson BankWatch's lowest rating
         category   and   indicates   that  the   obligation   is   regarded  as
         non-investment grade and therefore speculative.

CORPORATE AND MUNICIPAL LONG-TERM DEBT RATINGS

The following summarizes the ratings used by Standard & Poor's for corporate and
municipal debt:

         "AAA" - An obligation  rated "AAA" has the highest  rating  assigned by
         Standard  &  Poor's.  The  obligor's  capacity  to meet  its  financial
         commitment on the obligation is extremely strong.

         "AA"  - An  obligation  rated  "AA"  differs  from  the  highest  rated
         obligations  only in small degree.  The obligor's  capacity to meet its
         financial commitment on the obligation is very strong.

         "A" - An  obligation  rated "A" is  somewhat  more  susceptible  to the
         adverse  effects of changes in  circumstances  and economic  conditions
         than  obligations in higher-rated  categories.  However,  the obligor's
         capacity to meet its financial  commitment  on the  obligation is still
         strong.

         "BBB"  -  An  obligation  rated  "BBB"  exhibits  adequate   protection
         parameters.   However,   adverse   economic   conditions   or  changing
         circumstances  are more  likely to lead to a weakened  capacity  of the
         obligor to meet its financial commitment on the obligation.

Obligations  rated  "BB,"  "B,"  "CCC,"  "CC"  and "C" are  regarded  as  having
significant  speculative  characteristics.  "BB"  indicates  the least degree of
speculation and "C" the highest.  While such  obligations  will likely have some
quality  and  protective  characteristics,  these  may be  outweighed  by  large
uncertainties or major exposures to adverse conditions.

         "BB" - An obligation  rated "BB" is less  vulnerable to nonpayment than
         other speculative issues. However, it faces major ongoing uncertainties
         or exposure to adverse business, financial or economic conditions which
         could lead to the obligor's  inadequate  capacity to meet its financial
         commitment on the obligation.

         "B" - An obligation  rated "B" is more  vulnerable  to nonpayment  than
         obligations  rated "BB," but the obligor  currently has the capacity to
         meet its financial  commitment  on the  obligation.  Adverse  business,
         financial  or  economic  conditions  will likely  impair the  obligor's
         capacity  or  willingness  to  meet  its  financial  commitment  on the
         obligation.

         "CCC"  -  An  obligation   rated  "CCC"  is  currently   vulnerable  to
         nonpayment,  and is dependent  upon favorable  business,  financial and
         economic conditions for the obligor to meet its financial commitment on
         the  obligation.  In the  event  of  adverse  business,  financial,  or
         economic conditions,  the obligor is not likely to have the capacity to
         meet its financial commitment on the obligation.

         "CC" - An  obligation  rated "CC" is  currently  highly  vulnerable  to
nonpayment.

         "C" - The  "C"  rating  may be  used  to  cover  a  situation  where  a
         bankruptcy  petition  has been filed or similar  action has been taken,
         but payments on this obligation are being continued.

         "D" - An  obligation  rated "D" is in payment  default.  The "D" rating
         category  is used when  payments on an  obligation  are not made on the
         date due even if the  applicable  grace period has not expired,  unless
         S&P believes  that such payments will be made during such grace period.
         The "D"  rating  also  will be used  upon the  filing  of a  bankruptcy
         petition or the taking of a similar action if payments on an obligation
         are jeopardized.

PLUS (+) OR MINUS (-) - The ratings from "AA"  through  "CCC" may be modified by
the addition of a plus or minus sign to show relative  standing within the major
rating categories.

"r" - This symbol is attached to the  ratings of  instruments  with  significant
noncredit  risks.  It  highlights  risks to principal or  volatility of expected
returns  which  are  not  addressed  in the  credit  rating.  Examples  include:
obligations  linked  or  indexed  to  equities,   currencies,   or  commodities;
obligations  exposed  to  severe  prepayment  risk - such  as  interest-only  or
principal-only  mortgage  securities;   and  obligations  with  unusually  risky
interest terms, such as inverse floaters.

The following summarizes the ratings used by Moody's for corporate and municipal
long-term debt:

         "Aaa" - Bonds are  judged  to be of the best  quality.  They  carry the
         smallest  degree of investment  risk and are  generally  referred to as
         "gilt  edged."  Interest  payments  are  protected  by a large or by an
         exceptionally  stable margin and principal is secure. While the various
         protective  elements  are  likely to  change,  such  changes  as can be
         visualized  are  most  unlikely  to  impair  the  fundamentally  strong
         position of such issues.

         "Aa" -  Bonds  are  judged  to be of  high  quality  by all  standards.
         Together with the "Aaa" group they comprise what are generally known as
         high-grade  bonds.  They are rated  lower than the best  bonds  because
         margins of  protection  may not be as large as in "Aaa"  securities  or
         fluctuation of protective elements may be of greater amplitude or there
         may be other  elements  present  which make the  long-term  risk appear
         somewhat larger than the "Aaa" securities.

         "A" - Bonds possess many favorable investment  attributes and are to be
         considered as upper-medium-grade  obligations.  Factors giving security
         to principal and interest are considered adequate,  but elements may be
         present which suggest a  susceptibility  to impairment  sometime in the
         future.

         "Baa" - Bonds are considered as medium-grade  obligations,  (i.e., they
         are neither highly protected nor poorly secured). Interest payments and
         principal   security  appear  adequate  for  the  present  but  certain
         protective  elements  may  be  lacking  or  may  be  characteristically
         unreliable over any great length of time.  Such bonds lack  outstanding
         investment characteristics and in fact have speculative characteristics
         as well.

         "Ba,"  "B,"  "Caa,"  "Ca," and "C" - Bonds  that  possess  one of these
         ratings provide questionable protection of interest and principal ("Ba"
         indicates  speculative  elements;  "B"  indicates  a  general  lack  of
         characteristics  of desirable  investment;  "Caa" are of poor standing;
         "Ca" represents obligations which are speculative in a high degree; and
         "C"  represents  the lowest rated class of bonds).  "Caa," "Ca" and "C"
         bonds may be in default.

Con.  (---) - Bonds for which the security  depends upon the  completion of some
act or the  fulfillment  of some  condition are rated  conditionally.  These are
bonds secured by (a) earnings of projects  under  construction,  (b) earnings of
projects  unseasoned  in  operating  experience,  (c)  rentals  which begin when
facilities are completed, or (d) payments to which some other limiting condition
attaches.  Parenthetical  rating denotes probable credit stature upon completion
of construction or elimination of basis of condition.

Note:  Moody's  applies  numerical  modifiers 1, 2, and 3 in each generic rating
classification  from "Aa"  through  "Caa".  The  modifier 1  indicates  that the
obligation ranks in the higher end of its generic rating category;  the modifier
2 indicates a mid-range  ranking;  and the modifier 3 indicates a ranking in the
lower end of its generic rating category.

The following  summarizes  the long-term  debt ratings used by Duff & Phelps for
corporate and municipal long-term debt:

         "AAA" - Debt is considered  to be of the highest  credit  quality.  The
         risk  factors  are  negligible,  being  only  slightly  more  than  for
         risk-free U.S. Treasury debt.

         "AA" - Debt is  considered  to be of high  credit  quality.  Protection
         factors are strong.  Risk is modest but may vary  slightly from time to
         time because of economic conditions.

         "A" - Debt possesses protection factors which are average but adequate.
         However,  risk factors are more variable in periods of greater economic
         stress.

         "BBB"  - Debt  possesses  below-average  protection  factors  but  such
         protection   factors  are  still  considered   sufficient  for  prudent
         investment. Considerable variability in risk is present during economic
         cycles.

         "BB," "B,"  "CCC,"  "DD," and "DP" - Debt that  possesses  one of these
         ratings is  considered to be below  investment  grade.  Although  below
         investment  grade, debt rated "BB" is deemed likely to meet obligations
         when due. Debt rated "B" possesses the risk that  obligations  will not
         be met when due.  Debt rated "CCC" is well below  investment  grade and
         has  considerable  uncertainty  as  to  timely  payment  of  principal,
         interest or preferred  dividends.  Debt rated "DD" is a defaulted  debt
         obligation,  and  the  rating  "DP"  represents  preferred  stock  with
         dividend arrearages.

To provide more detailed  indications of credit  quality,  the "AA," "A," "BBB,"
"BB" and "B" ratings may be modified by the  addition of a plus (+) or minus (-)
sign to show relative standing within these major categories.

The  following  summarizes  the  ratings  used by Fitch IBCA for  corporate  and
municipal bonds:

         "AAA" - Bonds  considered  to be  investment  grade and of the  highest
         credit quality.  These ratings denote the lowest  expectation of credit
         risk and are assigned only in case of exceptionally strong capacity for
         timely  payment  of  financial  commitments.  This  capacity  is highly
         unlikely to be adversely affected by foreseeable events.

         "AA" - Bonds  considered to be investment grade and of very high credit
         quality. These ratings denote a very low expectation of credit risk and
         indicate  very  strong   capacity  for  timely   payment  of  financial
         commitments.   This  capacity  is  not   significantly   vulnerable  to
         foreseeable events.

         "A" - Bonds  considered  to be  investment  grade  and of  high  credit
         quality.  These  ratings  denote a low  expectation  of credit risk and
         indicate strong  capacity for timely payment of financial  commitments.
         This  capacity  may,  nevertheless,  be more  vulnerable  to changes in
         circumstances  or in  economic  conditions  than is the case for higher
         ratings.

         "BBB" - Bonds  considered  to be  investment  grade and of good  credit
         quality. These ratings denote that there is currently a low expectation
         of  credit  risk.   The  capacity  for  timely   payment  of  financial
         commitments   is   considered   adequate,   but   adverse   changes  in
         circumstances and in economic conditions are more likely to impair this
         capacity.

         "BB" - Bonds considered to be speculative.  These ratings indicate that
         there is a possibility of credit risk  developing,  particularly as the
         result of adverse  economic  changes  over time;  however,  business or
         financial  alternatives may be available to allow financial commitments
         to be met. Securities rated in this category are not investment grade.

         "B" - Bonds are considered highly  speculative.  These ratings indicate
         that significant credit risk is present, but a limited margin of safety
         remains.  Financial  commitments  are  currently  being  met;  however,
         capacity  for  continued   payment  is  contingent  upon  a  sustained,
         favorable business and economic environment.

         "CCC",  "CC" and "C" - Bonds have high default risk.  Default is a real
         possibility,  and capacity for meeting financial  commitments is solely
         reliant upon sustained,  favorable  business or economic  developments.
         "CC" ratings indicate that default of some kind appears  probable,  and
         "C" ratings signal imminent default.

         "DDD," "DD" and "D" - Bonds are in default.  Securities are not meeting
         obligations and are extremely speculative. "DDD" designates the highest
         potential  for  recovery  of  amounts  outstanding  on  any  securities
         involved and "D" represents the lowest potential for recovery.

To provide more detailed  indications of credit quality,  the Fitch IBCA ratings
from and including  "AA" to "B" may be modified by the addition of a plus (+) or
minus (-) sign to show relative standing within these major rating categories.

Thomson BankWatch  assesses the likelihood of an untimely repayment of principal
or  interest  over the term to maturity  of long term debt and  preferred  stock
which are issued by United States commercial banks,  thrifts and non-bank banks;
non-United States banks; and broker-dealers. The following summarizes the rating
categories used by Thomson BankWatch for long-term debt ratings:

         "AAA" - This designation  indicates that the ability to repay principal
and interest on a timely basis is extremely high.

         "AA" - This  designation  indicates  a very  strong  ability  to  repay
         principal and interest on a timely basis, with limited incremental risk
         compared to issues rated in the highest category.

         "A" - This  designation  indicates that the ability to repay  principal
         and interest is strong.  Issues rated "A" could be more  vulnerable  to
         adverse developments (both internal and external) than obligations with
         higher ratings.

         "BBB"  -  This  designation  represents  the  lowest   investment-grade
         category and  indicates an acceptable  capacity to repay  principal and
         interest.   Issues   rated  "BBB"  are  more   vulnerable   to  adverse
         developments  (both internal and external) than obligations with higher
         ratings.

         "BB," "B," "CCC," and "CC" - These designations are assigned by Thomson
         BankWatch  to  non-investment  grade  long-term  debt.  Such issues are
         regarded as having speculative characteristics regarding the likelihood
         of timely payment of principal and interest.  "BB" indicates the lowest
         degree of speculation and "CC" the highest degree of speculation.

         "D" - This designation indicates that the long-term debt is in default.

PLUS (+) OR MINUS (-) - The ratings  from "AAA"  through "CC" may include a plus
or minus sign designation  which indicates where within the respective  category
the issue is placed.

MUNICIPAL NOTE RATINGS

A Standard and Poor's rating  reflects the liquidity  concerns and market access
risks unique to notes due in three years or less.  The following  summarizes the
ratings used by Standard & Poor's Ratings Group for municipal notes:

         "SP-1" - The issuers of these municipal notes exhibit a strong capacity
         to pay principal and interest.  Those issues determined to possess very
         strong characteristics are given a plus (+) designation.

         "SP-2" - The  issuers of these  municipal  notes  exhibit  satisfactory
         capacity to pay  principal  and interest,  with some  vulnerability  to
         adverse financial and economic changes over the term of the notes.

         "SP-3" - The  issuers  of these  municipal  notes  exhibit  speculative
capacity to pay principal and interest.

Moody's  ratings for state and municipal  notes and other  short-term  loans are
designated Moody's Investment Grade ("MIG") and variable rate demand obligations
are  designated  Variable  Moody's  Investment  Grade  ("VMIG").   Such  ratings
recognize the differences between short-term credit risk and long-term risk. The
following  summarizes  the  ratings  by  Moody's  Investors  Service,  Inc.  for
short-term notes:

         "MIG-1"/"VMIG-1"  - This  designation  denotes best  quality.  There is
         present strong protection by established cash flows, superior liquidity
         support  or   demonstrated   broad-based   access  to  the  market  for
         refinancing.

         "MIG-2"/"VMIG-2" - This designation denotes high quality,  with margins
         of protection  that are ample although not so large as in the preceding
         group.

         "MIG-3"/"VMIG-3" - This designation denotes favorable quality, with all
         security elements accounted for but lacking the undeniable  strength of
         the preceding grades.  Liquidity and cash flow protection may be narrow
         and  market  access  for   refinancing   is  likely  to  be  less  well
         established.

         "MIG-4"/"VMIG-4"   -  This  designation   denotes   adequate   quality.
         Protection  commonly regarded as required of an investment  security is
         present and although not distinctly or predominantly speculative, there
         is specific risk.

         "SG" - This designation denotes speculative  quality.  Debt instruments
in this category lack of margins of protection.

Fitch  IBCA  and  Duff &  Phelps  use the  short-term  ratings  described  under
Commercial Paper Ratings for municipal notes.



<PAGE>


22


                                                APPENDIX B

To the extent  stated in the  Prospectus,  the  Portfolio may enter into certain
futures transactions. Such transactions are described in this Appendix.

I.         Interest Rate Futures Contracts

         Use of Interest Rate Futures Contracts.  Bond prices are established in
both the cash  market and the  futures  market.  In the cash  market,  bonds are
purchased  and sold with payment for the full  purchase  price of the bond being
made in cash,  generally  within  five  business  days after the  trade.  In the
futures market, only a contract is made to purchase or sell a bond in the future
for  a  set  price  on a  certain  date.  Historically,  the  prices  for  bonds
established  in the  futures  markets  have  tended  to  move  generally  in the
aggregate  in concert  with the cash market  prices and have  maintained  fairly
predictable  relationships.  Accordingly,  the  Portfolio  may use interest rate
futures  contracts as a defense,  or hedge,  against  anticipated  interest rate
changes.  As described  below,  this would  include the use of futures  contract
sales to protect  against  expected  increases  in  interest  rates and  futures
contract purchases to offset the impact of interest rate declines.

         The Portfolio presently could accomplish a similar result to that which
it hopes to achieve  through the use of futures  contracts by selling bonds with
long maturities and investing in bonds with short maturities when interest rates
are expected to increase, or conversely,  selling short-term bonds and investing
in long-term bonds when interest rates are expected to decline. However, because
of the liquidity that is often available in the futures  market,  the protection
is more likely to be achieved,  perhaps at a lower cost and without changing the
rate of interest being earned by the Portfolio, by using futures contracts.

         Interest  rate future  contracts  can also be used by the Portfolio for
non-hedging (speculative) purposes to increase total return.


         Description  of Interest  Rate  Futures  Contracts.  An  interest  rate
futures contract sale would create an obligation by the Portfolio, as seller, to
deliver the specific type of financial  instrument called for in the contract at
a specific future time for a specified price. A futures contract  purchase would
create an obligation  by the  Portfolio,  as purchaser,  to take delivery of the
specific type of financial  instrument  at a specific  future time at a specific
price. The specific securities delivered or taken,  respectively,  at settlement
date,  would not be  determined  until at or near that date.  The  determination
would be in  accordance  with the rules of the  exchange  on which  the  futures
contract sale or purchase was made.

         Although interest rate futures contracts by their terms call for actual
delivery or acceptance of securities, in most cases the contracts are closed out
before  the  settlement  date  without  the  making  or taking  of  delivery  of
securities.  Closing out a futures  contract sale is effected by the Portfolio's
entering into a futures  contract  purchase for the same aggregate amount of the
specific type of financial  instrument  and the same delivery date. If the price
of the sale  exceeds the price of the  offsetting  purchase,  the  Portfolio  is
immediately  paid the  difference  and thus realizes a gain.  If the  offsetting
purchase  price exceeds the sale price,  the Portfolio  pays the  difference and
realizes a loss.  Similarly,  the closing out of a futures contract  purchase is
effected  by  the  Portfolio  entering  into a  futures  contract  sale.  If the
offsetting sale price exceeds the purchase price, the Portfolio realizes a gain,
and if the purchase  price  exceeds the  offsetting  sale price,  the  Portfolio
realizes a loss.

         Interest rate futures contracts are traded in an auction environment on
the floors of several exchanges -- principally,  the Chicago Board of Trade, the
Chicago  Mercantile  Exchange and the New York Futures  Exchange.  Each exchange
guarantees performance under contract provisions through a clearing corporation,
a nonprofit organization managed by the exchange membership.

         A public  market  now  exists in  futures  contracts  covering  various
financial  instruments  including  long-term  U.S.  Treasury  Bonds  and  Notes;
Government National Mortgage Association (GNMA) modified  pass-through  mortgage
backed  securities;  three-month U.S. Treasury Bills; and ninety-day  commercial
paper. The Portfolio may trade in any interest rate futures  contracts for which
there exists a public  market,  including,  without  limitation,  the  foregoing
instruments.

II.        Index Futures Contracts

         General. A stock or bond index assigns relative values to the stocks or
bonds included in the index,  which fluctuates with changes in the market values
of the stocks or bonds included. Some stock index futures contracts are based on
broad  market  indexes,  such as  Standard  & Poor's  500 or the New York  Stock
Exchange Composite Index. In contrast, certain exchanges offer futures contracts
on narrower market  indexes,  such as the Standard & Poor's 100 or indexes based
on an industry or market indexes, such as Standard & Poor's 100 or indexes based
on an industry or market segment, such as oil and gas stocks.  Futures contracts
are traded on organized  exchanges  regulated by the Commodity  Futures  Trading
Commission.  Transactions  on such  exchanges  are  cleared  through a  clearing
corporation,  which  guarantees the performance of the parties to each contract.
To the extent consistent with its investment  objective,  the Portfolio may also
engage in  transactions,  from time to time, in foreign stock index futures such
as the ALL-ORDS  (Australia),  CAC-40  (France),  TOPIX (Japan) and the FTSE-100
(United Kingdom).

           The Portfolio  may sell index futures  contracts in order to offset a
           decrease  in market  value of its  portfolio  securities  that  might
           otherwise  result  from a market  decline.  The  Portfolio  may do so
           either to hedge the value of its portfolio as a whole,  or to protect
           against  declines,  occurring  prior to sales of  securities,  in the
           value of the  securities to be sold.  Conversely,  the Portfolio will
           purchase  index  futures  contracts in  anticipation  of purchases of
           securities.  A long  futures  position  may be  terminated  without a
           corresponding purchase of securities.

         In addition,  the  Portfolio  may utilize  index  futures  contracts in
anticipation  of changes  in the  composition  of its  portfolio  holdings.  For
example, in the event that the Portfolio expects to narrow the range of industry
groups  represented  in its  holdings it may,  prior to making  purchases of the
actual securities,  establish a long futures position based on a more restricted
index, such as an index comprised of securities of a particular  industry group.
The Portfolio may also sell futures  contracts in connection with this strategy,
in order to protect against the possibility  that the value of the securities to
be sold as part of the  restructuring of the portfolio will decline prior to the
time of sale.

         Index  futures  contracts  may  also  be  used  by  the  Portfolio  for
non-hedging (speculative) purposes to increase total return.

III.       Futures Contracts on Foreign Currencies

         A futures contract on foreign currency creates a binding  obligation on
one party to deliver, and a corresponding  obligation on another party to accept
delivery of, a stated quantity of foreign currency,  for an amount fixed in U.S.
dollars.  Foreign currency futures may be used by the Portfolio to hedge against
exposure to  fluctuations  in exchange  rates between the U.S.  dollar and other
currencies arising from multinational transactions.

IV.        Margin Payments

         Unlike purchases or sales of portfolio securities,  no price is paid or
received  by the  Portfolio  upon the  purchase  or sale of a futures  contract.
Initially,  the  Portfolio  will be required to deposit  with the broker or in a
segregated account with a custodian or sub-custodian an amount of liquid assets,
known as  initial  margin,  based on the value of the  contract.  The  nature of
initial  margin in  futures  transactions  is  different  from that of margin in
security  transactions  in that  futures  contract  margin  does not involve the
borrowing  of funds by the  customer to finance the  transactions.  Rather,  the
initial  margin is in the nature of a performance  bond or good faith deposit on
the contract which is returned to the Portfolio upon  termination of the futures
contract  assuming all contractual  obligations have been satisfied.  Subsequent
payments,  called variation  margin,  to and from the broker,  will be made on a
daily basis as the price of the  underlying  instruments  fluctuates  making the
long and short  positions  in the  futures  contract  more or less  valuable,  a
process  known as  "marking-to-market."  For  example,  when the  Portfolio  has
purchased a futures contract and the price of the contract has risen in response
to a rise in the  underlying  instruments,  that position will have increased in
value and the Portfolio  will be entitled to receive from the broker a variation
margin payment equal to that increase in value. Conversely,  where the Portfolio
has  purchased  a futures  contract  and the price of the  future  contract  has
declined in response to a decrease in the underlying  instruments,  the position
would be less valuable and the  Portfolio  would be required to make a variation
margin  payment to the broker.  Prior to  expiration  of the  futures  contract,
Investment  Adviser  may elect to close  the  position  by  taking  an  opposite
position,  subject to the availability of a secondary market, which will operate
to  terminate  the  Portfolio's  position  in  the  futures  contract.  A  final
determination of variation  margin is then made,  additional cash is required to
be paid by or released to the  Portfolio,  and the Portfolio  realizes a loss or
gain.

V.         Risks of Transactions in Futures Contracts

         There are several  risks in  connection  with the use of futures by the
Portfolio.  One  risk  arises  because  of  the  imperfect  correlation  between
movements  in the  price  of the  futures  and  movements  in the  price  of the
instruments which are the subject of the hedge. The price of the future may move
more than or less than the price of the instruments  being hedged.  If the price
of the  futures  moves  less  than the  price of the  instruments  which are the
subject of the hedge, the hedge will not be fully effective but, if the price of
the  instruments  being  hedged  has  moved  in an  unfavorable  direction,  the
Portfolio would be in a better position than if it had not hedged at all. If the
price of the instruments being hedged has moved in a favorable  direction,  this
advantage will be partially  offset by the loss on the futures.  If the price of
the futures moves more than the price of the hedged  instruments,  the Portfolio
involved will experience  either a loss or gain on the futures which will not be
completely  offset by  movements in the price of the  instruments  which are the
subject of the hedge.  To compensate for the imperfect  correlation of movements
in the price of  instruments  being hedged and movements in the price of futures
contracts,  the Portfolio may buy or sell futures  contracts in a greater dollar
amount than the dollar amount of instruments being hedged if the volatility over
a particular time period of the prices of such instruments has been greater than
the volatility over such time period of the futures,  or if otherwise  deemed to
be appropriate by the Investment Adviser.  Conversely,  the Portfolio may buy or
sell fewer futures  contracts if the volatility over a particular time period of
the prices of the instruments being hedged is less than the volatility over such
time period of the futures  contract  being used,  or if otherwise  deemed to be
appropriate  by the  Investment  Adviser.  It is also possible  that,  where the
Portfolio  has sold  futures  to hedge its  portfolio  against a decline  in the
market,  the  market  may  advance  and the  value  of  instruments  held in the
Portfolio may decline.  If this occurred,  the Portfolio would lose money on the
futures and also experience a decline in value in its portfolio securities.

         When futures are purchased to hedge against a possible  increase in the
price of  securities  or a currency  before the  Portfolio is able to invest its
cash (or cash equivalents) in an orderly fashion, it is possible that the market
may decline  instead;  if the Portfolio then concludes not to invest its cash at
that time because of concern as to possible  further market decline or for other
reasons,  the Portfolio will realize a loss on the futures  contract that is not
offset by a reduction in the price of the instruments that were to be purchased.

         In  addition  to  the  possibility  that  there  may  be  an  imperfect
correlation,  or no correlation at all, between movements in the futures and the
instruments being hedged, the price of futures may not correlate  perfectly with
movement  in the cash  market due to certain  market  distortions.  Rather  than
meeting  additional  margin  deposit  requirements,  investors may close futures
contracts  through  off-setting  transactions  which  could  distort  the normal
relationship  between  the cash and futures  markets.  Second,  with  respect to
financial  futures  contracts,  the liquidity of the futures  market  depends on
participants entering into off-setting transactions rather than making or taking
delivery. To the extent participants decide to make or take delivery,  liquidity
in the futures market could be reduced thus producing  distortions.  Third, from
the point of view of speculators, the deposit requirements in the futures market
are less onerous than margin  requirements in the securities market.  Therefore,
increased  participation  by  speculators  in the futures  market may also cause
temporary price  distortions.  Due to the possibility of price distortion in the
futures market, and because of the imperfect  correlation  between the movements
in the cash market and movements in the price of futures,  a correct forecast of
general market trends or interest rate  movements by the Investment  Adviser may
still not result in a successful hedging transaction over a short time frame.

         Positions  in futures may be closed out only on an exchange or board of
trade which provides a secondary market for such futures. Although the Portfolio
intends to purchase or sell  futures  only on exchanges or boards of trade where
there appear to be active secondary markets, there is no assurance that a liquid
secondary market on any exchange or board of trade will exist for any particular
contract or at any  particular  time.  In such event,  it may not be possible to
close  a  futures  investment  position,  and  in the  event  of  adverse  price
movements,  the  Portfolio  would  continue  to be  required  to make daily cash
payments of variation margin.  However, in the event futures contracts have been
used to hedge portfolio  securities,  such securities will not be sold until the
futures contract can be terminated.  In such  circumstances,  an increase in the
price of the  securities,  if any, may partially or completely  offset losses on
the futures contract.  However,  as described above,  there is no guarantee that
the price of the securities  will in fact correlate with the price  movements in
the futures contract and thus provide an offset on a futures contract.

         Further, it should be noted that the liquidity of a secondary market in
a futures contract may be adversely affected by "daily price fluctuation limits"
established  by commodity  exchanges  which limit the amount of fluctuation in a
futures  contract  price during a single  trading day.  Once the daily limit has
been  reached in the  contract,  no trades may be entered into at a price beyond
the limit,  thus  preventing  the  liquidation  of open futures  positions.  The
trading  of futures  contracts  is also  subject  to the risk of trading  halts,
suspensions,   exchange  or  clearing  house  equipment   failures,   government
intervention,  insolvency  of a  brokerage  firm  or  clearing  house  or  other
disruptions of normal trading  activity,  which could at times make it difficult
or impossible to liquidate  existing  positions or to recover  excess  variation
margin payments.

         Successful  use of  futures  by the  Portfolio  is also  subject to the
Investment  Adviser's ability to predict correctly movements in the direction of
the market. For example,  if the Portfolio has hedged against the possibility of
a decline in the market adversely affecting securities held by it and securities
prices increase  instead,  the Portfolio will lose part or all of the benefit to
the increased  value of its securities  which it has hedged because it will have
offsetting losses in its futures positions. In addition, in such situations,  if
the Portfolio  has  insufficient  cash,  it may have to sell  securities to meet
daily variation margin  requirements.  Such sales of securities may be, but will
not  necessarily  be, at increased  prices which reflect the rising market.  The
Portfolio may have to sell  securities at a time when it may be  disadvantageous
to do so.

VI.        Options on Futures Contracts

         The Portfolio  may purchase and write options on the futures  contracts
described  above. A futures  option gives the holder,  in return for the premium
paid,  the right to buy (call)  from or sell (put) to the writer of the option a
futures  contract  at a  specified  price at any time  during  the period of the
option.  Upon  exercise,  the  writer  of the  option  is  obligated  to pay the
difference  between  the cash value of the  futures  contract  and the  exercise
price. Like the buyer or seller of a futures contract, the holder, or writer, of
an  option  has the  right to  terminate  its  position  prior to the  scheduled
expiration of the option by selling, or purchasing an option of the same series,
at which time the person  entering into the closing  transaction  will realize a
gain or loss.  The  Portfolio  will be  required to deposit  initial  margin and
variation  margin  with  respect to put and call  options  on futures  contracts
written by it  pursuant  to  brokers'  requirements  similar to those  described
above. Net option premiums received will be included as initial margin deposits.
As an example, in anticipation of a decline in interest rates, the Portfolio may
purchase call options on futures  contracts as a substitute  for the purchase of
futures  contracts  to  hedge  against  a  possible  increase  in the  price  of
securities which the Portfolio intends to purchase.  Similarly,  if the value of
the  securities  held by the  Portfolio is expected to decline as a result of an
increase in interest  rates,  the Portfolio  might  purchase put options or sell
call options on futures contracts rather than sell futures contracts.

         Investments in futures options involve some of the same  considerations
that are involved in  connection  with  investments  in futures  contracts  (for
example, the existence of a liquid secondary market). In addition,  the purchase
or sale of an option  also  entails  the risk that  changes  in the value of the
underlying  futures  contract will not correspond to changes in the value of the
option purchased.  Depending on the pricing of the option compared to either the
futures  contract  upon which it is based,  or upon the price of the  securities
being  hedged,  an option  may or may not be less risky  than  ownership  of the
futures  contract or such securities.  In general,  the market prices of options
can be expected to be more  volatile  than the market  prices on the  underlying
futures  contract.  Compared  to the  purchase  or  sale of  futures  contracts,
however, the purchase of call or put options on futures contracts may frequently
involve less potential risk to the Portfolio  because the maximum amount at risk
is the premium paid for the options (plus transaction  costs). The writing of an
option on a futures  contract  involves risks similar to those risks relating to
the sale of futures contracts.

VII.       Other Matters

         Accounting for futures  contracts will be in accordance  with generally
accepted accounting principles.




<PAGE>


       Northern Institutional Funds

       MUNICIPAL PORTFOLIO

                  SERVICE SHARES
                  PREMIER SHARES


                                             OCTOBER 20, 1999




<PAGE>


Northern Institutional Funds


                                           MUNICIPAL PORTFOLIO

                                              SERVICE SHARES
                                              PREMIER SHARES





                                    Prospectus dated October 20, 1999

Northern  Institutional  Funds (the "Trust") offers five money market portfolios
to institutional  investors.  This Prospectus  describes the Municipal Portfolio
(the  "Portfolio").  Descriptions of the four other money market  portfolios are
included in separate  prospectuses.  The  Portfolio is authorized to offer three
classes  of  shares:  Shares,  Service  Shares and  Premier  Shares.  Shares are
included in a separate  prospectus.  The Trust's six fixed income,  one balanced
and seven equity portfolios are also described in separate prospectuses.

An  investment  in the Portfolio is not a deposit of any bank and is not insured
or  guaranteed  by the  Federal  Deposit  Insurance  Corporation  or  any  other
government  agency.  Although the Portfolio  seeks to preserve the value of your
investment at $1.00 per share,  it is possible to lose money by investing in the
Portfolio.

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>

<TABLE>
<CAPTION>
<S><C>                                           <C>                                              <C>

Contents

RISK/RETURN                                      MUNICIPAL PORTFOLIO                               5
SUMMARY

Information about the                            Principal Investment Strategies and Risks         5
objective, principal
strategies and risk                              Portfolio Performance                             8
characteristics of the Portfolio
                                                 Portfolio Fees and Expenses                       8
- ----------------------------------------------------------------------------------------------------------------

MANAGEMENT                                       Investment Adviser                                10
OF THE
PORTFOLIO                                        Advisory Fees                                     10

                                                 Portfolio Management                              10

                                                 Other Portfolio Services                          10
- ----------------------------------------------------------------------------------------------------------------

ABOUT YOUR                                       Purchasing and Selling Service Shares and Premier Shares
11
ACCOUNT
                                                      Investors                                    11
How to open, maintain
and close an account                                  Share Classes                                11

                                                      Opening an Account                           12

                                                      Selling Service Shares and Premier Shares    13

                                                 Account Policies and Other Information            14

                                                      Automatic Investment Arrangements            14

                                                      Purchase and Redemption Minimums             14

                                                      Calculating Share Price                      15

                                                      Timing of Purchase Requests                  15

                                                      Tax Identification Number                    15

                                                      In-Kind Purchases and Redemptions            16

                                                      Miscellaneous Purchase Information           16

                                                      Timing of Redemption and Exchange Requests   16

                                                      Miscellaneous Redemption Information         16

                                                      Exchange Privileges                          17

                                                      Telephone Transactions                       17

                                                      Advance Notification of Large Transactions   18

                                                      Making Changes to Your Account Information   18

                                                      Business Day                                 18

                                                      Early Closings                               18

                                                      Authorized Intermediaries                    18

                                                      Servicing Agents                             18

                                                 Distributions and Taxes                           20

                                                      Distributions                                20

                                                      Taxes                                        20

                                                      Other Tax Information                        21

                                                 Year 2000 Issues                                  21
- ----------------------------------------------------------------------------------------------------------------

RISKS, SECURITIES AND TECHNIQUES                 Risks, Securities and Techniques                  22
- ----------------------------------------------------------------------------------------------------------------

FOR MORE                                         Statement of Additional Information               28
INFORMATION


</TABLE>

<PAGE>


RISK/RETURN SUMMARY

MUNICIPAL PORTFOLIO

INVESTMENT OBJECTIVE

The Portfolio seeks to provide,  to the extent  consistent with the preservation
of capital,  a high level of income  exempt from regular  Federal  income tax by
investing  primarily in municipal  instruments.  This  objective  may be changed
without shareholder approval.

PRINCIPAL INVESTMENT STRATEGIES AND RISKS

Investment Strategies. The Portfolio seeks to achieve its objective by investing
primarily in high-quality  short-term municipal  instruments.  The high level of
income sought by the Portfolio is relative to yields currently  available in the
tax-exempt  market  place.  Municipal  instruments  are  debt  instruments,  the
interest on which is exempt from regular Federal income tax. These may include:

      Fixed, variable and floating rate notes and bonds;

      Asset-backed securities;

      Tax-exempt commercial paper;

      Municipal bonds, notes, paper or other instruments; and

     Municipal bonds and notes which are guaranteed as to principal and interest
          or backed by the U.S. government or its agencies or instrumentalities.

Under normal circumstances,  at least 80% of the Portfolio's annual gross income
will be derived from  municipal  instruments.  Under normal  market  conditions,
uninvested cash holdings and investments in taxable  instruments will not exceed
20% of the  value  of the  total  assets  of  the  Portfolio.  During  temporary
defensive periods,  however, all or any portion of the Portfolio's assets may be
held uninvested or invested in taxable instruments.

The Portfolio is not limited in the amount of its assets that may be invested in
AMT obligations  ("private activity bonds") the interest on which may be treated
as an item of tax  preference  to  shareholders  under the  Federal  alternative
minimum  tax.  For  shareholders  subject to AMT, a  significant  portion of the
Portfolio's  dividends  will be  subject  to the  Federal  tax to the extent the
Portfolio invests in AMT obligations.

Taxable investments will normally consist of U.S. dollar-denominated obligations
of U.S. banks,  foreign  commercial banks and securities issued or guaranteed by
foreign  governments;  high quality commercial paper;  other  obligations,  high
quality  corporate bonds and notes;  securities issued or guaranteed by the U.S.
government,  its  agencies or  instrumentalities  and  custodial  receipts  with
respect thereto; and repurchase agreements relation to the above instruments.

Risks. These primary  investment risks apply to the Portfolio:  stable NAV risk,
interest rate risk,  credit (or default) risk,  prepayment (or call) risk,  debt
extension risk, guarantor (or credit enhancement) risk,  management risk and tax
risk. These and other risks are summarized below.

In addition to the instruments  described  above,  the Portfolio may use various
investment  techniques in seeking its investment  objective.  You can learn more
about these  techniques  and related  risks by reading  "Risks,  Securities  and
Techniques"  beginning  on page  22 of this  Prospectus  and  the  Statement  of
Additional Information.

Please  keep in mind  that  the  Portfolio  cannot  guarantee  it will  meet its
investment  objective and it should not be relied upon as a complete  investment
program.

ADDITIONAL INFORMATION

The  Portfolio  seeks to  maintain a stable net asset  value of $1.00 per share.
Consistent with this policy, the Portfolio:

o        Limits its dollar-weighted average portfolio maturity to 90 days or
          less;
o        Buys securities  with remaining  maturities of 397 days or less (except
         for certain  variable  and floating  rate  instruments  and  securities
         collateralizing repurchase agreements); and
o        Invests only in U.S. dollar-denominated securities that represent
           minimal credit risks.

In addition,  the Portfolio  limits its investments to "Eligible  Securities" as
defined by the Securities and Exchange Commission  ("SEC").  Eligible Securities
include,  generally,  securities that either (a) have short-term debt ratings at
the time of purchase in the two highest  rating  categories or (b) are issued or
guaranteed  by, or otherwise  allow the  Portfolio to demand  payment  from,  an
issuer with those ratings.  Securities that are unrated (including securities of
issuers  that have  long-term  but not  short-term  ratings) may be deemed to be
Eligible  Securities if  determined to be of comparable  quality by The Northern
Trust Company under the direction of the Board of Trustees.  Securities that are
in the highest  short-term rating category (and comparable  unrated  securities)
are called "First Tier Securities." Securities in which the Portfolio may invest
may not earn as high a level of income as long-term or lower quality securities,
which generally have greater market risk and more fluctuation in market value.

In accordance with current SEC  Regulations,  the Portfolio will not invest more
than  5% of the  value  of its  total  assets  at the  time of  purchase  in the
securities of any single issuer.  However, the Portfolio may invest up to 25% of
its total assets in the  securities of a single issuer for up to three  Business
Days. These  limitations do not apply to cash,  certain  repurchase  agreements,
U.S.  government  securities  or securities of other  investment  companies.  In
addition,  certain securities subject to unconditional guarantees and securities
that are not  "First  Tier  Securities"  as  defined  by the SEC are  subject to
different  diversification   requirements  as  described  in  the  Statement  of
Additional Information.

                                        PRINCIPAL INVESTMENT RISKS

All  investments  carry some  degree of risk which will  affect the value of the
Portfolio's  investments,  investment  performance,  yield  and the price of its
shares.

An  investment  in the Portfolio is not a deposit of any bank and is not insured
or  guaranteed  by the  Federal  Deposit  Insurance  Corporation  or  any  other
government  agency.  Although the Portfolio  seeks to preserve the value of your
investment at $1.00 per share,  it is possible to lose money by investing in the
Portfolio.

The following summarizes the principal risks that may affect the Portfolio.

STABLE NAV RISK is the risk that the  Portfolio  will not be able to  maintain a
net asset value per share of $1.00 at all times.

INTEREST RATE RISK is the risk that during periods of rising interest rates, the
Portfolio's yield (and the market value of its securities) will tend to be lower
than  prevailing  market  rates;  in  periods  of falling  interest  rates,  the
Portfolio's  yield  (and the  market  value of its  securities)  will tend to be
higher.

CREDIT (OR DEFAULT)  RISK is the risk that an issuer of fixed income  securities
held by the  Portfolio  may default on its  obligation to pay interest and repay
principal. Generally, the lower the credit rating of a security, the greater the
risk that the  issuer of the  security  will  default  on its  obligation.  High
quality  securities  are generally  believed to have  relatively  low degrees of
credit risk.

PREPAYMENT  (OR CALL) RISK is the risk that an issuer will exercise its right to
pay principal on an obligation  held by the Portfolio  (such as an  asset-backed
security)  earlier than  expected.  This may happen during a period of declining
interest rates. Under these circumstances, the Portfolio may be unable to recoup
all of its initial  investment  and will suffer from having to reinvest in lower
yielding securities. The loss of higher yielding securities and the reinvestment
at lower interest rates can reduce the Portfolio's income.

DEBT  EXTENSION  RISK is the risk that an issuer will  exercise its right to pay
principal  on an  obligation  held by the  Portfolio  (such  as an  asset-backed
security)  later  than  expected.  This may  happen  during a period  of  rising
interest  rates.  Under these  circumstances,  the value of the obligation  will
decrease and the  Portfolio  will suffer from the  inability to invest in higher
yielding securities.

GUARANTOR  (OR  CREDIT  ENHANCEMENT)  RISK is the risk  that  changes  in credit
quality  of a U.S.  or  foreign  bank,  insurance  company  or  other  financial
institution  could cause the  Portfolio's  investments  in securities  backed by
letters  of  credit  or  other  credit  enhancements  issued  by  such  bank  or
institution to decline in value.

MANAGEMENT  RISK is the risk that a strategy used by the  investment  management
team may fail to produce the intended results.

LIQUIDITY RISK is the risk that the Portfolio will not be able to pay redemption
proceeds on the same Business Day that shares are  redeemed,  because of unusual
market  conditions,  an unusually  high volume of  redemption  requests or other
reasons.

YEAR 2000  RISK is the risk that the  Portfolio's  operations  or value  will be
adversely affected by the "Year 2000 Problem." (For more information, please see
"Year 2000 Issues" on page 21)

TAX RISK is the risk that future legislative or administrative  changes or court
decisions may  materially  affect the ability of the Portfolio to pay tax-exempt
dividends.

More  information  about the risks of investing in the  Portfolio is provided in
"Risks,  Securities and Techniques"  beginning on page 22. You should  carefully
consider  the  risks  discussed  in  these  sections  before  investing  in  the
Portfolio.

PORTFOLIO PERFORMANCE

The bar  charts  and the  performance  tables  have  been  omitted  because  the
Portfolio has been in operation for less than one calendar year.

PORTFOLIO FEES AND EXPENSES

This table  describes the fees and expenses that you may pay if you buy and hold
Service Shares and Premier Shares of the Portfolio. Please note that it does not
reflect any charges  which may be imposed by The  Northern  Trust  Company,  its
affiliates,  correspondent  banks and other  institutions on their Customers (as
defined on page 11).  (For more  information,  please see "Account  Policies and
Other Information" on page 14.)

                                                             Municipal Portfolio
<TABLE>
<CAPTION>
<S><C>                                                         <C>                       <C>

                                                                Service Shares           Premier Shares
SHAREHOLDER FEES (fees paid directly from your investment)
    Sales Charge (Load) Imposed on Purchases.................   None                      None
    Deferred Sales Charge (Load).............................   None                      None
    Sales Charge (Load) Imposed on Reinvested
    Distributions............................................   None                      None
    Redemption Fees..........................................   None                      None
    Exchange Fees............................................   None                      None

                                                                Service Shares            Premier Shares
ANNUAL PORTFOLIO OPERATING EXPENSES
(expenses that are deducted from Portfolio assets) 1
    Management Fees2.........................................   0.25%                     0.25%
    Distribution (12b-1) Fees................................   None                      None
    Servicing Agent Fees.....................................   0.25%                     0.50%
    Transfer Agency Fees.....................................   0.01%                     0.02%
    Other Expenses3..........................................   0.22%                     0.22%
    Total Annual Portfolio Operating Expenses4...............   0.73%                     0.99%
</TABLE>

1        The Portfolio's  annual operating expenses are based on actual fees and
         estimated expenses for the current fiscal year.

2        As  of  the  date  of  this  Prospectus,  the  Northern  Trust  Company
         ("Northern")  is voluntarily  waiving a portion of its management  fees
         for the  Portfolio.  As a result of the fee waiver,  actual  management
         fees to be paid by the Portfolio are 0.10% of the  Portfolio's  average
         daily net  assets.  Fee waivers  may be  terminated  at any time at the
         option of Northern.

3        "Other  Expenses"  include  (1)  co-administration  fees and all  other
         ordinary  operating  expenses of the Portfolio not listed above and (2)
         the payment of a fee to Northern or other  institutions under a Service
         Plan equal to 0.08% of the average daily net asset value of the Service
         Shares and  Premier  shares for systems  support and related  services.
         Northern and First Data  Investor  Services  Group,  Inc.  ("First Data
         Investor  Services  Group")  as  co-administrators  are  entitled  to a
         co-administration  fee from the Portfolio at an annual rate of 0.10% of
         the Portfolio's average daily net assets. Under their Co-Administration
         Agreement  with the  Trust,  which may be amended  without  shareholder
         approval,  the co-administrators  have agreed indefinitely to reimburse
         expenses  (including  fees payable to Northern and First Data  Investor
         Services Group as  co-administrators,  but excluding  management  fees,
         transfer  agency  fees,  fees paid under the  Service  Plan for Service
         Shares and Premier Shares and  extraordinary  expenses) which exceed on
         an annualized basis 0.10% of the Portfolio's  average daily net assets.
         As a result of the expense  reimbursement,  estimated  "Other Expenses"
         are currently 0.18% of the Portfolio's average daily net assets.

4        As a  result  of  the  fee  waivers  and  expense  reimbursements,  the
         estimated  actual  management  fees,  distribution  (12b-1) fees, other
         expenses and total annual operating  expenses for the Portfolio for the
         current  fiscal year are set forth below.  Fee waivers  (and  voluntary
         expense reimbursements, if applicable) may be terminated at any time at
         the option of Northern.  If this occurs, "Other Operating Expenses" may
         increase without shareholder approval.

<TABLE>
<CAPTION>
<S><C>                <C>                    <C>                <C>                   <C>

                                                                                       Total Annual
                       Management            Distribution                              Operating Expenses
                       Fees                  (12b-1) Fees        Other Expenses

Service Shares         0.10%                 0.00%               0.44%                 0.54%
Premier Shares         0.10%                 0.00%               0.70%                 0.80%
</TABLE>


EXAMPLE

The  following  Example is intended to help you compare the cost of investing in
the Portfolio (without fee waivers and expense  reimbursements) with the cost of
investing in other mutual funds.

The  Example  assumes  that you  invest  $10,000 in the  Portfolio  for the time
periods  indicated (with  reinvestment of all dividends and  distributions)  and
then redeem all of your  shares at the end of those  periods.  The Example  also
assumes that your  investment has a 5% return each year and that the Portfolio's
operating expenses remain the same.  Although your actual costs may be higher or
lower, based on these assumptions your costs would be:

                                                       1 Year      3 Years


         SERVICE SHARES                                $75           $233

         PREMIER SHARES                                $101          $315




<PAGE>


                                       MANAGEMENT OF THE PORTFOLIO

                                            Investment Adviser

The Northern Trust Company ("Northern" or the "Investment Adviser"), an Illinois
state-chartered  bank and  member  of the  Federal  Reserve  System,  serves  as
investment  adviser for the Portfolio.  The Investment  Adviser is located at 50
South LaSalle Street,  Chicago,  Illinois 60675 and is a wholly-owned subsidiary
of Northern Trust Corporation, a bank holding company. As of September 30, 1999,
Northern Trust Corporation and its subsidiaries had approximately  $33.7 billion
in assets, $19.1 billion in deposits and employed over 8,360 persons.

Northern and its affiliates  administrated in various  capacities  (including as
master trustee, investment manager or custodian) approximately $1.38 trillion of
assets as of  September  30, 1999,  including  approximately  $262.8  billion of
assets  for  which  Northern  and  its  affiliates  had  investment   management
responsibility.  Under its Advisory  Agreement  with the Trust,  the  Investment
Adviser, subject to the general supervision of the Trust's Board of Trustees, is
responsible  for making  investment  decisions for the Portfolio and for placing
purchase and sale orders for portfolio securities.

Advisory Fees

As  compensation  for its  advisory  services  and  its  assumption  of  related
expenses,  the  Investment  Adviser  is  entitled  to an  advisory  fee from the
Portfolio,  computed daily and payable monthly, at an annual contractual rate of
0.25% (expressed as a percentage of the Portfolio's average daily net assets).

The  difference,  if any,  between the  contractual  advisory fee and the actual
advisory fee that is paid by the  Portfolio  will  reflect  that the  Investment
Adviser  did not  charge  the full  amount of the  advisory  fee to which it was
entitled.  The  Investment  Adviser  may  discontinue  or modify  its  voluntary
limitation in the future at its discretion.

Portfolio Management

The Investment  Adviser employs a team approach to the investment  management of
the Portfolio,  relying upon  investment  professionals  under the leadership of
James M.  Snyder,  Chief  Investment  Officer and  Executive  Vice  President of
Northern.  Mr. Snyder  oversees the  management of all fixed income,  equity and
money  market  assets  managed by the  Investment  Adviser.  Mr.  Snyder  joined
Northern Trust in 1980.

Other Portfolio Services

Northern also serves as transfer agent ("Transfer  Agent") and custodian for the
Portfolio. As Transfer Agent, Northern performs various administrative servicing
functions, and any shareholder inquiries should be directed to it. The fees that
Northern  receives for its  services in those  capacities  are  described in the
Statement of Additional Information.  In addition,  Northern and its affiliates,
banks,  trust companies and other  institutions and organizations may enter into
agreements for the provision of administrative  support services for the Service
Share and Premier Share investors.  Northern and other  institutions may provide
consulting, technology and systems support services and receive fees relating to
cash  management or sweep account  services under a Service Plan described under
"Account Policies and Other Information - Servicing Agents" on page 14.


<PAGE>


35

Northern and First Data  Investor  Services  Group,  Inc.  ("First Data Investor
Services"),  a  wholly-owned  subsidiary  of First  Data  Corporation,  serve as
co-administrators  for the  Portfolio.  The fees that  Northern  and First  Data
Investor  Services  receive for their services in these capacities are described
on page 8 under "Portfolio Fees and Expenses."

PURCHASING AND SELLING SERVICE SHARES AND PREMIER SHARES
- ------------------------------------------------------------------------

Investors

Institutional  investors,  which are  acting on their own behalf or on behalf of
their customers,  clients, employees,  participants and others ("Customers") and
enter into a servicing  agreement with the Trust  ("Servicing  Agreement"),  may
invest in the Service Shares and Premier  Shares of the Portfolio  through their
institutional  accounts  at Northern or an  affiliate.  They may also  establish
accounts  directly  with  the  Trust.  There  is  no  sales  charge  imposed  on
investments. Institutional investors ("Institutions") include:

      Northern and its affiliates;

      Defined contribution plans having at least $30 million in assets or annual
     contributions of at least $5 million; and

      Other institutions and organizations.
- ------------------------------------------------------------------------

Share Classes

The  Portfolio  offers  three  classes  of shares to meet the  special  needs of
institutional investors: Shares, Service Shares and Premier Shares.

      Shares are  described  in a separate  prospectus  and do not  provide  for
     payments by the Portfolio to  Institutions  for  administrative  support or
     shareholder liaison services.

      Service Shares are designed for Institutions that agree with the Portfolio
     to  provide  (or  arrange  for the  provision  of)  administrative  support
     services to Customers.

      Premier Shares are designed for Institutions that agree with the Portfolio
     to provide (or arrange for the  provision  of)  administrative  support and
     shareholder liaison services to Customers.

Shares of each class bear their pro rata portion of all operating  expenses paid
by the Portfolio,  except  amounts  payable under the Service Plan that has been
adopted  for the  Portfolio's  Service  Shares and Premier  Shares and  transfer
agency fees.  The Service Plan  provides for payments at an annual rate of up to
0.33% and 0.58% of the  average  daily net asset  value of  Service  Shares  and
Premier Shares,  respectively.  Because of these  class-specific  expenses,  the
performance  of the Shares of the  Portfolio  is  expected to be higher than the
performance of both the Service Shares and Premier Shares and the performance of
the Portfolio's  Service Shares is expected to be higher than the performance of
the                               Premier                                Shares.
- ------------------------------------------------------------------------

Opening An Account

You may purchase Service Shares and Premier Shares of the Portfolio through your
institutional  account at Northern (or an  affiliate) or you may open an account
directly with the Trust with a minimum  initial  investment of $5 million in one
or more  portfolios  of the Trust.  This  minimum  does not apply,  however,  to
Service  Shares and  Premier  Shares  purchased  through a  Northern  cash sweep
program. There is no minimum for subsequent investments.

Through an Institutional Account. If you are opening an institutional account at
Northern,  a  Northern  representative  can  assist  you with all phases of your
investment.  To purchase  Service Shares or Premier Shares through your account,
contact your Northern representative for further information.

Directly  from the Trust.  An  Institution  may open a  shareholder  account and
purchase  Service Shares and Premier Shares directly from the Trust as described
in this Prospectus.
- ------------------------------------------------------------------------

By Mail.

Read this Prospectus carefully.

Complete and sign the new account application.

Include a  certified  corporate  resolution  (or other  acceptable  evidence  of
authority).

Enclose a check or Federal Reserve draft payable to the Portfolio.

Mail your check, corporate resolution and completed application to:

        Northern Institutional Funds
        c/o The Northern Trust Company
        P.O. Box 75943
        Chicago, Illinois 60675-5943

All checks must be payable in U.S.  dollars  and drawn on a bank  located in the
United   States.   Cash   and   third   party   checks   are   not   acceptable.
- ------------------------------------------------------------------------

By Telephone.

Read this Prospectus carefully.

Call the Transfer Agent at 1-800-637-1380.

To open a new account please provide:

o      The name of the Portfolio in which you'd like to invest

o      The number of Service Shares or Premier Shares or dollar amount to be
          invested

o      The method of payment

To add to an existing account, please provide:

o      The Institution's name

o      Your Account Number

By Wire or Automated Clearing House Transfer ("ACH Transfer").

To open a new account:

Call the Transfer Agent at 1-800-637-1380 for instructions.

For more  information  about the purchase of Service  Shares or Premier  Shares,
call the Transfer Agent at 1-800-637-1380.

To add to an existing account:

Have your bank wire Federal funds or effect an ACH Transfer to:

        The Northern Trust Company
        Chicago, Illinois
        ABA Routing No. 0710-00152
        (Reference 10 Digit Portfolio Account No.)
        (Reference Shareholder's Name)
- ------------------------------------------------------------------------

Selling Service Shares and Premier Shares

Through an Institutional Account.  Institutions may sell (redeem) Service Shares
and Premier  Shares  through their  institutional  account by  contacting  their
Northern account representative.

Directly  through  the Trust.  Institutions  that  purchase  Service  Shares and
Premier  Shares  directly  from the Trust may redeem  their  Service  Shares and
Premier Shares through the Transfer Agent in one of the following ways:

By Mail.

Send a written request to:

        Northern Institutional Funds
        c/o The Northern Trust Company
        P.O. Box 75943
        Chicago, Illinois 60675-5943
The letter of instruction must include:

o      The signature of a duly authorized person

o      Your account number

o      The name of the Portfolio
o      The number of Service Shares or Premier Shares or the dollar amount to
       be redeemed

By Telephone.

      Call the Transfer Agent at 1-800-637-1380 for instructions.

      During  periods  of  unusual  economic  or  market   activity,   telephone
     redemptions  may be difficult  to  implement.  In such event,  shareholders
     should follow the procedures  outlined above under "Selling  Service Shares
     and Premier Shares By Mail."

By Wire.

      Call the Transfer Agent at 1-800-637-1380 for instructions.

      You must have given authorization for expedited wire redemption.

      The minimum amount that may be redeemed by this method is $10,000.

                                  Account Policies and Other Information

Automatic Investment Arrangements.  Institutions may purchase Service Shares and
Premier  Shares  through  their  institutional  accounts at  Northern  either by
directing automatic investment of cash balances in excess of certain agreed upon
amounts or by directing  investments from time to time on a non-automatic basis.
Northern will place a purchase  order  generated  under an automatic  investment
direction  either on the Business Day that funds are available in the account or
on the next Business Day,  depending upon the terms of the automatic  investment
arrangement.  Similarly,  Northern will place a redemption order generated under
an automatic investment direction either on the Business Day Northern calculates
the redemption  amount needed to bring the account balance up to the agreed upon
amount or on the next  Business Day,  depending  upon the terms of the automatic
investment  arrangement.  If a redemption  order is placed on the next  Business
Day,  Northern  will  normally  provide  funds by  provisionally  crediting  the
Institution's  account on the day the calculation is made.  Institutions  should
contact  Northern  for  more  information   about  their  automatic   investment
arrangements.

Purchase and Redemption  Minimums.  There is a minimum initial  investment of $5
million in the  Portfolio  and one or more other  investment  portfolios  of the
Trust. This minimum does not apply, however, to Service Shares or Premier Shares
purchased  through a  Northern  cash  sweep  program.  There is no  minimum  for
subsequent  investments.  A $10,000 minimum applies for redemptions by wire. The
Trust  reserves  the right to waive  purchase  and  redemption  minimums  and to
determine the manner in which a minimum is satisfied.

Calculating Share Price. The Trust issues and redeems Service Shares and Premier
Shares at net asset value ("NAV"). The NAV for each share class of the Portfolio
is  calculated  by dividing the value of net assets  attributed to that class by
the number of  outstanding  shares of the class.  The NAV for the  Portfolio and
class is  calculated as of 3:00 p.m.,  Chicago time,  each Business Day. The NAV
used in  determining  the price of your Service Shares and Premier Shares is the
one calculated after your purchase,  exchange or redemption order is received or
accepted as described below. The Portfolio seeks to maintain an NAV of $1.00 per
share by valuing the obligations held by it at amortized cost in accordance with
SEC regulations. Amortized cost will normally approximate market value.

Timing of Purchase  Requests.  Requests  accepted by the Transfer Agent or other
authorized  intermediary by 1:00 p.m., Chicago time, on any Business Day will be
executed the same day, provided that either:

o        The Transfer  Agent  receives  the  purchase  price in Federal or other
         immediately  available funds prior to 1:00 p.m., Chicago time, the same
         Business Day;

o        The order is accepted by an authorized  intermediary  and payment is to
         be made by the  close  of the same  Business  Day in  Federal  or other
         immediately  available funds according to procedures  authorized by the
         Trust; or

o        Payment in Federal or other immediately  available funds is received by
         the  close  of  the  same  Business  Day  in an  institutional  account
         maintained with Northern or an affiliate.

Orders  received by the Transfer  Agent or other  authorized  intermediary  on a
non-Business  Day or after 1:00 p.m.,  Chicago  time,  on a Business Day will be
executed on the next Business Day, provided that payment is made as noted above.
We consider  requests  to be in "good  order" when all  required  documents  are
properly  completed,  signed  and  received,  including  a  certified  corporate
resolution or other acceptable evidence of authority. If an Institution pays for
Service Shares or Premier Shares by check,  Federal funds  generally will become
available within two Business Days after a purchase order is received.

If payment is not received as described above from an authorized intermediary on
the same Business Day of acceptance of an order by the authorized  intermediary,
the  authorized  intermediary  may  be  liable  for  fees  and  losses  and  the
transaction may be cancelled.

In  certain  circumstances,  the Trust may  advance  the time by which  purchase
orders must be received. See "Early Closings" on page 18.

Tax Identification  Number.  Federal  regulations  require you to provide to the
Transfer  Agent a  taxpayer  identification  number  when you  open an  account.
Purchase  orders  without such a number or an indication  that a number has been
applied for will not be  accepted.  If you have  applied for a number,  you must
provide it to the Transfer Agent within 60 days of the date of the order.



<PAGE>


In-Kind  Purchases  and  Redemptions.  The  Trust  reserves  the right to accept
payment for Service Shares and Premier Shares in the form of securities that are
permissible investments for the Portfolio.  The Trust also reserves the right to
pay redemptions by a distribution "in-kind" of securities (instead of cash) from
the  Portfolio.   See  the  Statement  of  Additional  Information  for  further
information about the terms of these purchases and redemptions.

Miscellaneous Purchase Information.

o        Institutions  are responsible for  transmitting  purchase orders to the
         Transfer Agent and delivering required funds on a timely basis.
o        Institutions  are  responsible  for  all  losses  and  expenses  of the
         Portfolio in the event of any failure to make payment  according to the
         procedures outlined in this Prospectus. Northern may redeem shares from
         any account it maintains to protect the Portfolio and Northern  against
         loss.  In  addition,  a $20 charge  will be imposed if a check does not
         clear.

o        Service  Shares and Premier Shares of the Portfolio are entitled to the
         dividends  declared by the Portfolio  beginning on the Business Day the
         purchase  order is  executed,  provided  payment  in  Federal  or other
         immediately  available  funds is received by the Transfer  Agent by the
         time designated above.

o        The Trust  reserves the right to reject any purchase  order.  The Trust
         also  reserves the right to change or  discontinue  any of its purchase
         procedures.

Timing of Redemption and Exchange  Requests.  Redemption  and exchange  requests
will be effected at the NAV next  determined  after your  exchange or redemption
order is received in good order.  Good order means that the request includes the
following:  the account number and Portfolio name; the amount of the transaction
(as  specified in dollars or shares);  and the  signature  of a duly  authorized
person (except for telephone and wire  redemptions).  See "Account  Policies and
Other Information -- Making Changes to Your Account Information."

If either the Transfer  Agent or Northern  (with  respect to your  institutional
account)  receives a redemption order by 1:00 p.m.,  Chicago time, on a Business
Day,  redemption  proceeds  will  normally  be paid in  Federal  funds  or other
immediately  available funds wired or sent by check to you or, if you so choose,
to your institutional account with Northern, on the same Business Day.

Redemption  orders received after 1:00 p.m.,  Chicago time, will be effected the
next Business Day. Proceeds for redemption orders received on a non-Business Day
will normally be sent on the next Business Day after receipt in good order.

In certain circumstances, the Trust may advance the time by which redemption and
exchange orders must be received. See "Early Closings" on page 18.

Miscellaneous  Redemption  Information.  All redemption proceeds will be sent by
check unless the Transfer Agent is directed  otherwise.  Redemption proceeds may
also be wired.  A redemption  request may not be processed if a shareholder  has
failed to submit a completed  and  properly  executed  new account  application,
including a corporate resolution or other acceptable evidence of authority.

o        The Trust  reserves  the right to defer  crediting,  sending  or wiring
         redemption  proceeds for up to 7 days after  receiving  the  redemption
         order if, in its judgment,  an earlier payment could  adversely  affect
         the Portfolio.

o        If you are  redeeming  recently  purchased  Service  Shares or  Premier
         Shares,  your redemption request may not be honored until your check or
         electronic transaction has cleared. This may delay your transaction for
         up to 15 days.

o        Institutions are responsible for transmitting  redemption orders to the
         Transfer Agent and crediting their Customers'  accounts with redemption
         proceeds on a timely basis.
o        Redemption  requests by mail must be signed by a person  authorized  by
         acceptable documentation on file with the Transfer Agent.

o        Dividends on Service  Shares and Premier  Shares are earned through and
         including the day prior to the day on which they are redeemed.

o        The Trust  reserves  the right to redeem  Service  Shares  and  Premier
         Shares held by any  shareholder  who provides  incorrect or  incomplete
         account information or when such involuntary  redemptions are necessary
         to avoid adverse consequences to the Trust and its shareholders.

o        The Trust may require any  information  reasonably  necessary to ensure
         that a redemption request has been duly authorized.

o        The Trust reserves the right to change or discontinue any of its
         redemption procedures.

Exchange  Privileges.  Institutions and their Customers (to the extent permitted
by their account  agreements) may exchange  Service Shares and Premier Shares of
the Portfolio for Service Shares and Premier  Shares,  respectively,  of another
portfolio.  The  registration  of both accounts  involved  must be identical.  A
$1,000 minimum investment applies. An exchange is a redemption of shares you own
and the purchase of shares you are  acquiring.  It is considered a taxable event
and may result in a gain or loss.

The Trust reserves the right to change or discontinue the exchange  privilege at
any time upon 60 days' written notice to shareholders and to reject any exchange
request. Exchanges are only available in states where an exchange can legally be
made.  Before making an exchange you should read the  prospectus  for the shares
you are acquiring.

Telephone Transactions. For your protection,  telephone requests may be recorded
in order to verify their accuracy.  In addition,  the Transfer Agent has adopted
procedures in an effort to establish  reasonable  safeguards  against fraudulent
telephone  transactions.  If  reasonable  measures  are  taken  to  verify  that
telephone instructions are genuine, the Trust and its service providers will not
be  responsible   for  any  loss  resulting  from   fraudulent  or  unauthorized
instructions received over the telephone.  In these circumstances,  shareholders
will bear the risk of loss.  During periods of unusual market activity,  you may
have trouble  placing a request by telephone.  In this event,  consider  sending
your request in writing.

The proceeds of redemption  orders  received by telephone will be sent by check,
wire or  transfer  according  to proper  instructions.  All checks  will be made
payable  to the  shareholder  of record  and  mailed  only to the  shareholder's
address of record.

The Trust reserves the right to refuse a telephone redemption.

Advance  Notification  of  Large  Transactions.   The  Trust  requests  that  an
Institution  give advance  notice to the Transfer  Agent by 11:00 a.m.,  Chicago
time,  if it intends to place a purchase  or  redemption  order of $5 million or
more on a Business Day.

Making  Changes  to Your  Account  Information.  You may make  changes to wiring
instructions,  address of record, or other account  information only in writing.
These  instructions  must be  accompanied by a certified  corporate  resolution,
signature  guarantee  from an  institution  participating  in the Stock Transfer
Agency Medallion Program ("STAMP"),  or other acceptable  evidence of authority.
In accordance  with SEC  regulations,  the Trust and Transfer Agent may charge a
shareholder reasonable costs in locating a shareholder's current address.

Business Day. A "Business  Day" is each Monday  through  Friday when Northern or
the New York Stock  Exchange is open for  business.  A  "Business  Day" does not
include a holiday observed by Northern and the Exchange.  In 1999 these holidays
are: New Year's Day, Martin Luther King, Jr. Day, Presidents' Day, Memorial Day,
Independence Day, Labor Day, Thanksgiving and Christmas Day.

Early  Closings.  The Portfolio  reserves the right to cease,  or to advance the
time for,  accepting  purchase,  redemption or exchange orders for same Business
Day credit when  Northern or the  Exchange  closes  early as a result of unusual
weather or other  conditions.  It also  reserves this right when The Bond Market
Association recommends that securities markets close or close early.

Authorized   Intermediaries.   The  Trust  may   authorize   certain   financial
intermediaries  (including  banks,  trust  companies,   brokers  and  investment
advisers),  which provide  recordkeeping,  reporting and processing services, to
accept  purchase,  redemption and exchange orders from their Customers on behalf
of the  Trust.  They may also  designate  other  intermediaries  to accept  such
orders, if approved by the Trust. Authorized  intermediaries are responsible for
transmitting  orders and delivering  funds on a timely basis. The Portfolio will
be deemed to have received an order when the order is accepted by the authorized
intermediary  on a Business Day, and the order will be priced at the Portfolio's
per share NAV next determined.

Servicing Agents.  Institutions  perform (or arrange to have performed)  various
administrative  support services for customers who are the beneficial  owners of
either Service Shares or Premier Shares through  Servicing  Agreements  with the
Trust ("Servicing  Agents").  In addition,  institutions  perform (or arrange to
have performed) account  maintenance  services under their Servicing  Agreements
for Premier Shares.  These Servicing  Agreements are permitted under the Trust's
Service Plan ("Service Plan"). For both Service Shares and Premier Shares, these
services may include:

      establishing and maintaining individual accounts and records;

      processing purchase, redemption and exchange orders;


<PAGE>


          placing net purchase and redemption orders with Northern acting as the
     Trust's Transfer Agent; and

      providing cash management or sweep accounts and similar programs and
     services.

Servicing  Agents will receive fees from the Portfolio for these  services at an
annual rate of up to 0.25% of the  average  daily net asset value of the Service
Shares and Premier Shares beneficially owned by their Customers.

Personal and account  maintenance  services  provided under the Service Plan for
Premier Shares may include:
      providing information to investors regarding the Portfolio or relating to
      the status of their accounts; and

      acting as liaison between investors and the Trust.

Servicing  Agents will  receive  additional  fees from the  Portfolio  for these
services at an annual  rate of up to 0.25% of the average  daily net asset value
of Premier Shares beneficially owned by their Customers.

The Service Plan also  provides for the payment of fees to Northern,  First Data
Investor  Services Group or other  Institutions at an annual rate of up to 0.08%
of the  average  daily net asset  value of  Service  Shares and  Premier  Shares
serviced by Institutions for ongoing consulting,  technology and systems support
services relating to cash management or sweep account services. All fees payable
under the Service Plan are borne solely by the share class to which the services
are provided and not by the Portfolio's other share classes.

Northern  may  provide  additional  compensation  to certain  dealers  and other
financial  intermediaries  who provide services to their Customers who invest in
the Trust or whose Customers purchase  significant  amounts of Service Shares or
Premier Shares of the Portfolio.  The amount of such compensation may be made on
a one-time  and/or  periodic  basis,  and may  represent all or a portion of the
annual fees earned by Northern as Investment Adviser (after  adjustments).  This
compensation  will be paid by Northern or its  affiliates and will not represent
an additional expense to the Trust or its shareholders.

You should read your account  agreement with your  Institution  carefully.  Your
Institution's  requirements may differ from those listed in this Prospectus.  An
Institution may impose account charges,  such as asset allocation fees,  account
maintenance  fees,  and other  charges  that will  reduce  the net  return on an
investment in the  Portfolio.  If you have agreed to maintain a minimum  balance
with your  Institution  and the  balance  falls below this  minimum,  you may be
required to redeem all or a part of your investment in the Portfolio.

Conflict of interest  restrictions may apply to the receipt of compensation from
the Trust by an Institution in connection with the investment of fiduciary funds
in  Service  Shares  or  Premier  Shares  of  the  Portfolio.  Banks  and  other
institutions  regulated by the Office of Comptroller  of the Currency,  Board of
Governors  of the Federal  Reserve  System and state  banking  commissions,  and
investment  advisers and other money managers subject to the jurisdiction of the
SEC,  the  Department  of Labor or state  securities  commissions,  are urged to
consult legal counsel before entering into Servicing Agreements.

State  securities  laws  regarding the  registration  of dealers may differ from
Federal law. As a result,  Institutions  investing in the Portfolio on behalf of
their Customers may be required to register as dealers.

                                          DISTRIBTIONS AND TAXES

DISTRIBUTIONS

Dividends  from net income are declared  daily and paid monthly by the Portfolio
to its shareholders. Net income includes the interest accrued on the Portfolio's
assets less estimated expenses.  The Portfolio's net realized short-term capital
gains, if any, are distributed at least annually.  The Portfolio does not expect
to realize net long-term capital gain.

Dividends are paid as soon as practical  following the end of each month, except
in the case of a total  redemption  of Service  Shares or  Premier  Shares in an
account that is not subject to a standing  order for the purchase of  additional
shares of the same class.  In that event,  dividends will be paid promptly along
with the redemption proceeds.

All  distributions are  automatically  reinvested  (without any sales charge) in
additional  Service  Shares or Premier  Shares of the  Portfolio,  respectively,
unless you elect to receive  distributions  in cash by  notifying  the  Transfer
Agent in writing.  You may make  arrangements to credit these  distributions  to
your account with Northern, its affiliates or its correspondent banks.

There are no fees or sales charges on reinvestments.

TAXES

The Portfolio intends to qualify as a regulated  investment  company for Federal
tax purposes,  and to distribute to  shareholders  substantially  all of its net
investment  income and net capital gain. There are certain tax requirements that
the Portfolio must follow in order to avoid Federal taxation.  In its efforts to
adhere to these  requirements,  the Portfolio  may have to limit its  investment
activity in some types of instruments.

The  Portfolio  expects to pay  "exempt-interest  dividends"  that are generally
exempt from regular Federal income tax.  However,  a significant  portion of the
exempt-interest  dividends  paid  by  the  Portfolio  will  be an  item  of  tax
preference  for  purposes  of  determining   Federal   alternative  minimum  tax
liability.  Exempt-interest  dividends will also be considered  along with other
adjusted  gross income in  determining  whether any Social  Security or railroad
retirement payments received by you are subject to Federal income taxes.

If you receive an  exempt-interest  dividend  with  respect to any share and the
share is held for six months or less,  any loss on the sale or  exchange  of the
share will be  disallowed  to the extent of the  dividend  amount.  Interest  on
indebtedness  incurred  by a  shareholder  to  purchase  or carry  shares of the
Portfolio generally will not be deductible for federal income tax purposes.



<PAGE>


Except as stated below, you may be subject to state and local taxes on Portfolio
distributions and redemptions. State income taxes may not apply, however, to the
portions of the  Portfolio's  distributions,  if any, that are  attributable  to
interest on certain types of Federal securities or interest on securities issued
by the particular state or municipalities within the state.

In all cases,  distributions,  if any, derived from net long-term  capital gains
will generally be taxable to you as long-term  capital gains,  and any dividends
derived  from  short-term  capital  gains and  taxable  interest  income will be
taxable to you as ordinary income.

OTHER TAX INFORMATION

Dividends and  distributions  from the Portfolio will generally be reportable by
you in the tax year in which they are paid,  with one  exception.  Dividends and
distributions  declared by the  Portfolio  in October,  November or December and
paid in January are taxed as though they were paid by December 31.

Every year, the Trust will send you information detailing the amount of ordinary
income and capital gains distributed to your account for the previous year.

Your  investment in the Portfolio could have  additional tax  consequences.  You
should  consult your tax  professional  for  information  regarding  all the tax
consequences applicable to your investment in the Portfolio. More information is
provided in the Statement of Additional  Information.  This short summary is not
intended as a substitute for careful tax planning.

Dividends  paid by the  Portfolio  may be  taxable  under  state or local law as
dividend  income even though all or a portion of such  dividends  may be derived
from interest on obligations which, if realized  directly,  would be exempt from
such income taxes.

Year 2000 Issues

Like every other business  dependent upon computerized  information  processing,
Northern Trust Corporation ("Northern Trust") must deal with "Year 2000" issues.

Many  computer  systems use two digits  rather  than four to identify  the year.
Unless adapted,  these systems may not be able to correctly distinguish the Year
2000 from the Year 1900. As the Year 2000 approaches, many systems may be unable
to  accurately  process  certain  date-based  information,  which  could cause a
variety  of  operational  problems  for  businesses.  This could have a negative
effect on the  companies in which the Portfolio  invests,  thus  decreasing  the
Portfolio's investment returns.

Northern Trust has implemented  steps to prepare its critical  computer  systems
and processes for Year 2000 processing. It has established a dedicated Year 2000
Project Team whose members have significant  systems development and maintenance
experience.  Northern Trust's Year 2000 project includes a comprehensive testing
plan of its critical  systems.  Northern Trust has advised the Trust that it has
substantially  completed  work on its critical  systems and testing with outside
parties.



<PAGE>


Northern  Trust also has a program to  monitor  and assess the  efforts of other
parties,  such as other service providers to the Portfolio.  However,  it cannot
control the success of those other parties' efforts. Contingency plans are being
established to provide  Northern Trust with  alternatives in case these entities
experience significant Year 2000 difficulties that impact Northern Trust.

Furthermore,  even if the actions taken by Northern  Trust are  successful,  the
normal operations of the Portfolio may, in any event, be disrupted significantly
by the failure of  communications  and public  utility  companies,  governmental
entities,  financial  processors or others to perform their services as a result
of Year 2000 problems.

Efforts in foreign  countries to remediate  potential Year 2000 problems are not
as extensive  as those in the United  States.  As a result,  the  operations  of
foreign markets, foreign issuers and foreign governments may be disrupted by the
Year 2000 problem and the investment  holdings of the Portfolio may be adversely
affected.

RISKS, SECURITIES AND TECHNIQUES

This section takes a closer look at some of the types of securities in which the
Portfolio  may invest and their  related  risks.  It also  explores  the various
investment  techniques  that the  investment  management  team  may,  but is not
required to, use. The Portfolio may invest in other  securities  and are subject
to further  restrictions  and risks  which are  described  in the  Statement  of
Additional Information.

ASSET-BACKED SECURITIES.  Asset-backed securities are sponsored by entities such
as government agencies,  banks, financial companies and commercial or industrial
companies.  Asset-backed securities represent  participations in, or are secured
by and payable from,  pools of various  types of real and personal  property and
other  financial  assets.  Such asset pools are  securitized  through the use of
privately   formed  trusts  or  special   purpose   corporations.   Payments  or
distributions  of principal and interest may be guaranteed up to certain amounts
and for a certain time period by a letter of credit or a pooled insurance policy
issued by a financial institution, or other credit enhancements.

     INVESTMENT   STRATEGY.   The  Portfolio  may  purchase   various  types  of
asset-backed securities that are "Eligible Securities" as defined by the SEC.

       SPECIAL  RISKS.  In  addition  to credit  and market  risk,  asset-backed
       securities  involve prepayment risk because the underlying assets (loans)
       may be prepaid at any time. The value of these securities may also change
       because of actual or  perceived  changes in the  creditworthiness  of the
       originator,  the servicing agent, the financial institution providing the
       credit support, or the counterparty.  Like other fixed income securities,
       when interest rates rise, the value of an asset-backed security generally
       will decline.  However,  when  interest  rates  decline,  the value of an
       asset-backed  security with prepayment  features may not increase as much
       as that of other  fixed  income  securities.  In  addition,  non-mortgage
       asset-backed   securities   involve   certain   risks  not  presented  by
       mortgage-backed securities.  Primarily, these securities may not have the
       benefit of the same security interest in the underlying collateral.

BORROWINGS  AND REVERSE  REPURCHASE  AGREEMENTS.  The Portfolio may borrow money
from banks and may enter into reverse repurchase agreements with banks and other
financial institutions.  Reverse repurchase agreements involve the sale of money
market  securities held by the Portfolio  subject to its agreement to repurchase
them at a mutually agreed upon date and price (including interest).

       INVESTMENT  STRATEGY.  The  Portfolio  may borrow and enter into  reverse
       repurchase  agreements  in amounts not  exceeding  one-third of its total
       assets (including the amount borrowed). These transactions may be entered
       into as a temporary measure for emergency  purposes or to meet redemption
       requests. Reverse repurchase agreements may also be entered into when the
       investment  management team expects that the interest income to be earned
       from the investment of the transaction  proceeds will be greater than the
       related interest expense.

       SPECIAL  RISKS.  Borrowings  and reverse  repurchase  agreements  involve
       leveraging.  If the  securities  held by the  Portfolio  decline in value
       while  these  transactions  are  outstanding,  the net asset value of the
       Portfolio's  outstanding  shares will decline in value by proportionately
       more than the decline in value of the  securities.  In addition,  reverse
       repurchase  agreements  involve the risks that the interest income earned
       by the Portfolio  (from the investment of the proceeds) will be less than
       the  interest  expense of the  transaction,  that the market value of the
       securities  sold by the  Portfolio  will  decline  below  the  price  the
       Portfolio is obligated to pay to repurchase the securities,  and that the
       securities may not be returned to the Portfolio.

DERIVATIVES.  The Portfolio may purchase  certain  "derivative"  instruments.  A
derivative  is a financial  instrument  whose value is derived  from -- or based
upon -- the  performance  of  underlying  assets,  interest  rates,  or indices.
Derivatives include structured debt obligations such as asset-backed securities,
"stripped" securities and various floating rate instruments.

       INVESTMENT STRATEGY. The Portfolio will invest in derivatives only if the
       potential   risks  and  rewards  are  consistent   with  the  Portfolio's
       objective, strategies and overall risk profile.

       SPECIAL  RISKS.  Engaging in  derivative  transactions  involves  special
       risks,  including  (a)  market  risk  that  the  Portfolio's  derivatives
       position will lose value;  (b) credit risk that the  counterparty  to the
       transaction  will  default;  (c)  leveraging  risk  that the value of the
       derivative  instrument  will decline more than the value of the assets on
       which it is based; (d) illiquidity risk that the Portfolio will be unable
       to sell its position  because of lack of market depth or disruption;  (e)
       pricing risk that the value of a derivative  instrument will be difficult
       to determine; and (f) operations risk that loss will occur as a result of
       inadequate  systems or human error.  Many types of derivatives  have been
       recently  developed and have not been tested over complete market cycles.
       For these  reasons,  the  Portfolio  may suffer a loss whether or not the
       analysis of the investment management team is accurate.

DOWNGRADED  SECURITIES.  After  its  purchase,  the  portfolio  security  may be
assigned a lower rating or cease to be rated. If this occurs,  the Portfolio may
continue to hold the issue if the Investment  Adviser believes it is in the best
interest of the Portfolio and its shareholders.

ILLIQUID OR RESTRICTED SECURITIES.  Illiquid securities include certain variable
amount  master  demand  notes that cannot be called  within seven days and other
securities  that are traded in the U.S. but are subject to trading  restrictions
because they are not  registered  under the  Securities  Act of 1933, as amended
(the "1933 Act").

       INVESTMENT STRATEGY. The Portfolio may invest up to 10% of its net assets
       in securities that are illiquid.  A domestically traded security which is
       not registered under the 1933 Act will not be considered  illiquid if the
       Investment  Adviser determines that an adequate trading market exists for
       that security.  If otherwise consistent with its investment objective and
       policies,  the Portfolio may purchase commercial paper issued pursuant to
       Section 4(2) of the 1933 Act and securities that are not registered under
       the  1933  Act but can be sold to  "qualified  institutional  buyers"  in
       accordance  with Rule 144A under the 1933 Act. These  securities will not
       be  considered  illiquid so long as the  Investment  Adviser  determines,
       under  guidelines  approved by the  Trust's  Board of  Trustees,  that an
       adequate trading market exists.

       SPECIAL  RISKS.  Because  illiquid  and  restricted   securities  may  be
       difficult to sell at an acceptable  price, they may be subject to greater
       volatility  and may result in a loss to the  Portfolio.  The  practice of
       investing  in Rule  144A  Securities  could  increase  the  level  of the
       Portfolio's  illiquidity  during any period that qualified  institutional
       buyers become uninterested in purchasing these securities.

INVESTMENT  COMPANIES.  In  connection  with the  management  of its daily  cash
positions,  the Portfolio may invest in shares of other money market funds which
invest in short-term,  high quality debt  securities  and  securities  issued by
other  investment  companies  consistent  with  its  investment  objectives  and
policies.

       INVESTMENT  STRATEGY.  Investments by the Portfolio in other money market
       funds will be subject to the limitations of the Investment Company Act of
       1940.  Although the Portfolio does not expect to do so in the foreseeable
       future,  the Portfolio is authorized to invest  substantially  all of its
       assets in an open-end  investment  company  that has the same  investment
       objective, policies and fundamental restrictions as the Portfolio.

       SPECIAL  RISKS.  As a  shareholder  of another  investment  company,  the
       Portfolio  would be subject to the same  risks as any other  investor  in
       that  company.  It would also bear a  proportionate  share of any fees or
       expenses paid by that company. These expenses would be in addition to the
       advisory  fees  and  other  expenses  the  Portfolio  bears  directly  in
       connection with its own operations.

MUNICIPAL  AND  RELATED   INSTRUMENTS.   Municipal   instruments   include  debt
obligations issued by or on behalf of states, territories and possessions of the
United  States  and their  political  subdivisions,  agencies,  authorities  and
instrumentalities.

Municipal  instruments  include both  "general" and  "revenue"  bonds and may be
issued to obtain funds for various  public  purposes.  General  obligations  are
secured by the  issuer's  pledge of its full  faith,  credit  and taxing  power.
Revenue obligations are payable only from the revenues derived from a particular
facility or class of facilities.  In some cases,  revenue bonds are also payable
from the proceeds of a special excise or other  specific  revenue source such as
lease  payments  from the user of a  facility  being  financed.  Some  municipal
instruments, known as private activity bonds, are issued to finance projects for
private companies.  Private activity bonds are usually revenue obligations since
they are typically payable by the private user of the facilities financed by the
bonds.

Municipal  instruments also include "moral obligation" bonds,  municipal leases,
certificates of participation and custodial receipts. Moral obligation bonds are
supported  by a  moral  commitment  but  not a legal  obligation  of a state  or
municipality.  Municipal leases and participation  certificates present the risk
that the state or municipality  involved will not appropriate the monies to meet
scheduled payments on an annual basis. Custodial receipts represent interests in
municipal instruments held by a trustee.

The  Portfolio  may acquire  "stand-by  commitments"  relating to the  municipal
instruments it holds. Under a stand-by commitment,  a dealer agrees to purchase,
at the Portfolio's option, specified municipal instruments at a specified price.
A stand-by  commitment may increase the cost,  and thereby reduce the yield,  of
the municipal  instruments to which the commitment  relates.  The Portfolio will
acquire stand-by commitments solely to facilitate portfolio liquidity and do not
intend to exercise their rights for trading purposes.

           INVESTMENT  STRATEGY.  Although  it is not  the  Portfolio's  current
           policy  to  do  so  on  a  regular  basis,  in  connection  with  its
           investments in municipal  instruments,  the Portfolio may invest more
           than 25% of its total  assets in municipal  instruments  the interest
           upon which is paid solely by  governmental  issuers from  revenues of
           similar  projects.  However,  the Portfolio does not intend to invest
           more  than  25% of  the  value  of its  total  assets  in  industrial
           development bonds or similar  obligations where the  non-governmental
           entities supplying the revenues to be paid are in the same industry.

           SPECIAL RISKS.  Municipal  instruments purchased by the Portfolio may
           be backed by letters of credit,  insurance  or other  forms of credit
           enhancement issued by foreign (as well as domestic) banks,  insurance
           companies and other financial institutions.  If the credit quality of
           these banks, insurance companies and financial institutions declines,
           the Portfolio could suffer a loss to the extent that the Portfolio is
           relying upon this credit support.  Foreign  institutions  can present
           special risks relating to higher  transaction and custody costs,  the
           imposition of additional taxes by foreign governments,  less complete
           financial information,  less market liquidity, more market volatility
           and political  instability.  Foreign banks,  insurance  companies and
           financial  institutions  may be  subject  to less  stringent  reserve
           requirements, and to different accounting, auditing and recordkeeping
           requirements than U.S banks.

           In addition,  when a substantial portion of the Portfolio's assets is
           invested  in  instruments  which  are  used  to  finance   facilities
           involving a particular industry,  whose issuers are in the same state
           or  which  are  otherwise  related,  there is a  possibility  that an
           economic,  business or political development affecting one instrument
           would likewise affect the related instrument.

SECURITIES  LENDING.  In order to generate  additional income, the Portfolio may
lend  securities  on a short-term  basis to banks,  brokers and dealers or other
qualified institutions. In exchange, the Portfolio will receive collateral equal
to at least 100% of the value of the securities loaned.

       INVESTMENT  STRATEGY.  Securities  lending  may  represent  no more  than
       one-third the value of the Portfolio's  total assets  (including the loan
       collateral).  Any cash collateral received by the Portfolio in connection
       with these loans may be invested in U.S. government  securities and other
       liquid high-grade debt obligations.

       SPECIAL RISKS.  The main risk when lending  portfolio  securities is that
       the borrower might become  insolvent or refuse to honor its obligation to
       return the  securities.  In this event,  the Portfolio  could  experience
       delays in  recovering  its  securities  and may possibly  incur a capital
       loss. In addition, the Portfolio may incur a loss in reinvesting the cash
       collateral it receives.

STRIPPED  OBLIGATIONS.  These  securities are issued by  governmental  entities,
banks and other  financial  institutions.  They  entitle  the  holder to receive
either interest payments or principal  payments that have been "stripped" from a
debt obligation.

       INVESTMENT  STRATEGY.  To  the  extent  consistent  with  its  investment
       objective, the Portfolio may purchase stripped securities. SPECIAL RISKS.
       Stripped  securities  are very  sensitive to interest rate changes and to
       the rate of  principal  prepayments.  A rapid or  unexpected  increase in
       prepayments  could depress the price of certain  stripped  securities and
       adversely affect the Portfolio's total return.

TAXABLE  INVESTMENTS.   Taxable  investments  include  U.S.   dollar-denominated
obligations of U.S. banks,  foreign  commercial  banks and securities  issued or
guaranteed  by foreign  governments;  high  quality  commercial  paper and other
obligations;  high quality corporate bonds and notes;  asset-backed  securities;
securities  issued  or  guaranteed  by the  U.S.  government,  its  agencies  or
instrumentalities  and related  custodial  receipts;  and repurchase  agreements
relating to the above instruments.

                      INVESTMENT STRATEGY. The Portfolio may invest from time to
                      time,  on a  temporary  basis or for  temporary  defensive
                      purposes,  in  short-term  taxable  instruments  that  are
                      "Eligible  Securities"  as  defined  by the SEC for  money
                      market funds.

                      SPECIAL  RISKS.  Dividends  paid by the Portfolio that are
                      derived from  interest  paid on taxable  investments  will
                      generally be taxable to the  Portfolio's  shareholders  as
                      ordinary  income  for  Federal  income tax  purposes.  The
                      Portfolio may not achieve its  investment  objective  when
                      its assets are invested in taxable obligations.

VARIABLE AND FLOATING RATE  INSTRUMENTS.  Variable and floating rate instruments
have interest rates that are  periodically  adjusted  either at set intervals or
that  float  at  a  margin  above  a  generally  recognized  index  rate.  These
instruments  include  long-term  variable  and  floating  rate bonds  (sometimes
referred to as "Put Bonds") where the Portfolio  obtains at the time of purchase
the  right  to put the  bond  back to the  issuer  or a third  party at par at a
specified date.

             INVESTMENT STRATEGY.  The Portfolio may invest in rated and unrated
             variable and floating  rate  instruments  to the extent  consistent
             with its investment objective. Unrated instruments may be purchased
             by the Portfolio if they are determined by the  Investment  Adviser
             to be of  comparable  quality  to rated  instruments  eligible  for
             purchase by the Portfolio.

             SPECIAL  RISKS.  Because  there is no active  secondary  market for
             certain  variable and floating rate  instruments,  they may be more
             difficult to sell if the issuer defaults on its payment obligations
             or during  periods  when the  Portfolio is not entitled to exercise
             its demand rights.

WHEN-ISSUED SECURITIES, DELAYED DELIVERY TRANSACTIONS AND FORWARD COMMITMENTS. A
purchase of "when-issued"  securities refers to a transaction made conditionally
because the securities, although authorized, have not yet been issued. A delayed
delivery or forward  commitment  transaction  involves a contract to purchase or
sell  securities  for a fixed  price  at a  future  date  beyond  the  customary
settlement period.

       INVESTMENT  STRATEGY.  The Portfolio may purchase or sell securities on a
       when-issued,  delayed delivery or forward commitment basis.  Although the
       Portfolio would generally purchase  securities in these transactions with
       the intention of acquiring the  securities,  the Portfolio may dispose of
       such  securities  prior to settlement if the investment  management  team
       deems it appropriate to do so.

       SPECIAL RISKS.  Purchasing securities on a when-issued,  delayed delivery
       or forward  commitment  basis  involves the risk that the  securities may
       decrease  in value by the time they are  actually  issued  or  delivered.
       Conversely,  selling securities in these  transactions  involves the risk
       that the value of the  securities  may increase  before the time they are
       actually issued or delivered.  These  transactions  also involve the risk
       that  the  seller  may  fail  to  deliver  the  security  or  cash on the
       settlement date.




<PAGE>


                                           For More Information

ANNUAL/
SEMIANNUAL
REPORT

Additional  information  about the Portfolio's  investments will be available in
the Portfolio's annual and semiannual reports to shareholders.

        STATEMENT OF ADDITIONAL INFORMATION

Additional information about the Portfolio and its policies is also available in
the  Portfolio's  Statement  of  Additional  Information  ("SAI").  The  SAI  is
incorporated  by reference into this  Prospectus (is legally  considered part of
this Prospectus).

The Portfolio's  annual and semiannual  reports (when they become available) and
the SAI are available free upon request by calling 1-800-637-1380.

To obtain other information and for shareholder inquiries:

By telephone -- Call 1-800-637-1380

By mail -- Northern Institutional Funds
             P.O. Box 75943
             Chicago, IL 60675

On the Internet -- Text-only versions of the Portfolio's documents are available
on the SEC's website at http://www.sec.gov.

You may review and obtain copies of Trust documents by visiting the SEC's Public
Reference Room in Washington, D.C. You may also obtain copies of Trust documents
by sending your  request and a  duplicating  fee to the SEC's  Public  Reference
Section, Washington, D.C. 20549-6009. Information on the operation of the Public
Reference Room may be obtained by calling the SEC at 1-800-SEC-0330.

Northern
Institutional Funds
SERVICE SHARES AND PREMIER SHARES PROSPECTUS

811-3605



<PAGE>


INVESTMENT ADVISER

The Northern Trust Company
50 South LaSalle Street
Chicago, IL 60675

TRANSFER AGENT
AND CUSTODIAN

The Northern Trust Company


<PAGE>


       Northern Institutional Funds

       MUNICIPAL PORTFOLIO
       SHARES

                                             OCTOBER 20, 1999




<PAGE>


Northern Institutional Funds


                         MUNICIPAL PORTFOLIO
                         SHARES




                                    Prospectus dated October 20, 1999

Northern  Institutional  Funds (the "Trust") offers five money market portfolios
to institutional  investors.  This Prospectus  describes the Municipal Portfolio
(the  "Portfolio").  Descriptions of the four other money market  portfolios are
included in separate  prospectuses.  The  Portfolio is authorized to offer three
classes of shares: Shares, Service Shares and Premier Shares. Service Shares and
Premier  Shares are  described in a separate  prospectus.  The Trust's six fixed
income,  one balanced and seven equity portfolios are also described in separate
prospectuses.

An  investment  in the Portfolio is not a deposit of any bank and is not insured
or  guaranteed  by the  Federal  Deposit  Insurance  Corporation  or  any  other
government  agency.  Although the Portfolio  seeks to preserve the value of your
investment at $1.00 per share,  it is possible to lose money by investing in the
Portfolio.

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>

<TABLE>
<CAPTION>
<S><C>                                          <C>                                               <C>

Contents

RISK/RETURN                                      MUNICIPAL PORTFOLIO                               5
SUMMARY

Information about the                            Principal Investment Strategies and Risks         5
objective, principal
strategies and risk                              Portfolio Performance                             8
characteristics of the Portfolio
                                                 Portfolio Fees and Expenses                       8
- ----------------------------------------------------------------------------------------------------------------

MANAGEMENT                                       Investment Adviser                                10
        OF THE
PORTFOLIO                                        Advisory Fees                                     10

                                                 Portfolio Management                              10

                                                 Other Portfolio Services                          10
- ----------------------------------------------------------------------------------------------------------------

ABOUT YOUR                                       Purchasing and Selling Shares                     11
        ACCOUNT
                                                      Investors                                    11
How to open, maintain
and close an account                                  Share Classes                                11

                                                      Opening an Account                           11

                                                      Selling Shares                               13

                                                 Account Policies and Other Information            14

                                                      Automatic Investment Arrangements            14

                                                      Purchase and Redemption Minimums             14

                                                      Calculating Share Price                      14

                                                      Timing of Purchase Requests                  15

                                                      Tax Identification Number                    15

                                                      In-Kind Purchases and Redemptions            15

                                                      Miscellaneous Purchase Information           15

                                                      Timing of Redemption and Exchange Requests   16

                                                      Miscellaneous Redemption Information         16

                                                      Exchange Privileges                          17

                                                      Telephone Transactions                       17

                                                      Advance Notification of Large Transactions   17

                                                      Making Changes to Your Account Information   18

                                                      Business Day                                 18

                                                      Early Closings                               18

                                                      Authorized Intermediaries                    18

                                                      Information About Institutions               18

                                                 Distributions and Taxes                           19

                                                      Distributions                                19

                                                      Taxes                                        19

                                                      Other Tax Information                        20

                                                 Year 2000 Issues                                  20
- ----------------------------------------------------------------------------------------------------------------

RISKS, SECURITIES AND TECHNIQUES                 Risks, Securities and Techniques                  21
- ----------------------------------------------------------------------------------------------------------------

FOR MORE                                         Statement of Additional Information               27
        INFORMATION

</TABLE>

<PAGE>


                                           RISK/RETURN SUMMARY

MUNICIPAL PORTFOLIO

INVESTMENT OBJECTIVE

The Portfolio seeks to provide,  to the extent  consistent with the preservation
of capital,  a high level of income  exempt from regular  Federal  income tax by
investing  primarily in municipal  instruments.  This  objective  may be changed
without shareholder approval.

PRINCIPAL INVESTMENT STRATEGIES AND RISKS

Investment Strategies. The Portfolio seeks to achieve its objective by investing
primarily in high-quality  short-term municipal  instruments.  The high level of
income sought by the Portfolio is relative to yields currently  available in the
tax-exempt  market  place.  Municipal  instruments  are  debt  instruments,  the
interest on which is exempt from regular Federal income tax. These may include:

               Fixed, variable and floating rate notes and bonds;

               Asset-backed securities;

               Tax-exempt commercial paper;

               Municipal bonds, notes, paper or other instruments; and

               Municipal  bonds and notes which are  guaranteed  as to principal
          and  interest  or backed by the U.S.  government  or its  agencies  or
          instrumentalities.

Under normal circumstances,  at least 80% of the Portfolio's annual gross income
will be derived from  municipal  instruments.  Under normal  market  conditions,
uninvested cash holdings and investments in taxable  instruments will not exceed
20% of the  value  of the  total  assets  of  the  Portfolio.  During  temporary
defensive periods,  however, all or any portion of the Portfolio's assets may be
held uninvested or invested in taxable instruments.

The Portfolio is not limited in the amount of its assets that may be invested in
AMT obligations  ("private activity bonds") the interest on which may be treated
as an item of tax  preference  to  shareholders  under the  Federal  alternative
minimum  tax.  For  shareholders  subject to AMT, a  significant  portion of the
Portfolio's  dividends  will be  subject  to the  Federal  tax to the extent the
Portfolio invests in AMT obligations.

Taxable investments will normally consist of U.S. dollar-denominated obligations
of U.S. banks,  foreign  commercial banks and securities issued or guaranteed by
foreign  governments;  high quality commercial paper,  other  obligations;  high
quality  corporate bonds and notes;  securities issued or guaranteed by the U.S.
government,  its  agencies or  instrumentalities  and  custodial  receipts  with
respect thereto; and repurchase agreements relating to the above instruments.

Risks. These primary  investment risks apply to the Portfolio:  stable NAV risk,
interest rate risk,  credit (or default) risk,  prepayment (or call) risk,  debt
extension  risk,   guarantor  (or  credit  enhancement)  risk,  liquidity  risk,
management risk and tax risk. These and other risks are summarized below.

In addition to the instruments  described  above,  the Portfolio may use various
investment  techniques in seeking its investment  objective.  You can learn more
about these  techniques  and related  risks by reading  "Risks,  Securities  and
Techniques"  beginning  on page  21 of this  Prospectus  and  the  Statement  of
Additional Information.

Please  keep in mind  that  the  Portfolio  cannot  guarantee  it will  meet its
investment  objective and it should not be relied upon as a complete  investment
program.

ADDITIONAL INFORMATION

The  Portfolio  seeks to  maintain a stable net asset  value of $1.00 per share.
Consistent with this policy, the Portfolio:

o        Limits its dollar-weighted average portfolio maturity to 90 days or
          less;
o        Buys securities  with remaining  maturities of 397 days or less (except
         for certain  variable  and floating  rate  instruments  and  securities
         collateralizing repurchase agreements); and
o        Invests only in U.S. dollar-denominated securities that represent
          minimal credit risks.

In addition,  the Portfolio  limits its investments to "Eligible  Securities" as
defined by the Securities and Exchange Commission  ("SEC").  Eligible Securities
include,  generally,  securities that either (a) have short-term debt ratings at
the time of purchase in the two highest  rating  categories or (b) are issued or
guaranteed  by, or otherwise  allow the  Portfolio to demand  payment  from,  an
issuer with those ratings.  Securities that are unrated (including securities of
issuers  that have  long-term  but not  short-term  ratings) may be deemed to be
Eligible  Securities if  determined to be of comparable  quality by The Northern
Trust Company under the direction of the Board of Trustees.  Securities that are
in the highest  short-term rating category (and comparable  unrated  securities)
are called "First Tier Securities." Securities in which the Portfolio may invest
may not earn as high a level of income as long-term or lower quality securities,
which generally have greater market risk and more fluctuation in market value.

In accordance with current SEC  Regulations,  the Portfolio will not invest more
than  5% of the  value  of its  total  assets  at the  time of  purchase  in the
securities of any single issuer.  However, the Portfolio may invest up to 25% of
its total assets in the  securities of a single issuer for up to three  Business
Days. These  limitations do not apply to cash,  certain  repurchase  agreements,
U.S.  government  securities  or securities of other  investment  companies.  In
addition,  certain securities subject to unconditional guarantees and securities
that are not  "First  Tier  Securities"  as  defined  by the SEC are  subject to
different  diversification   requirements  as  described  in  the  Statement  of
Additional Information.

                                        PRINCIPAL INVESTMENT RISKS

All  investments  carry some  degree of risk which will  affect the value of the
Portfolio's  investments,  investment  performance,  yield  and the price of its
shares.

An  investment  in the Portfolio is not a deposit of any bank and is not insured
or  guaranteed  by the  Federal  Deposit  Insurance  Corporation  or  any  other
government  agency.  Although the Portfolio  seeks to preserve the value of your
investment at $1.00 per share,  it is possible to lose money by investing in the
Portfolio.

The following summarizes the principal risks that may affect the Portfolio.

STABLE NAV RISK is the risk that the  Portfolio  will not be able to  maintain a
net asset value per share of $1.00 at all times.

INTEREST RATE RISK is the risk that during periods of rising interest rates, the
Portfolio's yield (and the market value of its securities) will tend to be lower
than  prevailing  market  rates;  in  periods  of falling  interest  rates,  the
Portfolio's  yield  (and the  market  value of its  securities)  will tend to be
higher.

CREDIT (OR DEFAULT)  RISK is the risk that an issuer of fixed income  securities
held by the  Portfolio  may default on its  obligation to pay interest and repay
principal. Generally, the lower the credit rating of a security, the greater the
risk that the  issuer of the  security  will  default  on its  obligation.  High
quality  securities  are generally  believed to have  relatively  low degrees of
credit risk.

PREPAYMENT  (OR CALL) RISK is the risk that an issuer will exercise its right to
pay principal on an obligation  held by the Portfolio  (such as an  asset-backed
security)  earlier than  expected.  This may happen during a period of declining
interest rates. Under these circumstances, the Portfolio may be unable to recoup
all of its initial  investment  and will suffer from having to reinvest in lower
yielding securities. The loss of higher yielding securities and the reinvestment
at lower interest rates can reduce the Portfolio's income.

DEBT  EXTENSION  RISK is the risk that an issuer will  exercise its right to pay
principal  on an  obligation  held by the  Portfolio  (such  as an  asset-backed
security)  later  than  expected.  This may  happen  during a period  of  rising
interest  rates.  Under these  circumstances,  the value of the obligation  will
decrease and the  Portfolio  will suffer from the  inability to invest in higher
yielding securities.

GUARANTOR  (OR  CREDIT  ENHANCEMENT)  RISK is the risk  that  changes  in credit
quality  of a U.S.  or  foreign  bank,  insurance  company  or  other  financial
institution  could cause the  Portfolio's  investments  in securities  backed by
letters  of  credit  or  other  credit  enhancements  issued  by  such  bank  or
institution to decline in value.

MANAGEMENT  RISK is the risk that a strategy used by the  investment  management
team may fail to produce the intended results.

LIQUIDITY RISK is the risk that the Portfolio will not be able to pay redemption
proceeds on the same Business Day that shares are  redeemed,  because of unusual
market  conditions,  an unusually  high volume of  redemption  requests or other
reasons.

YEAR 2000  RISK is the risk that the  Portfolio's  operations  or value  will be
adversely affected by the "Year 2000 Problem." (For more information, please see
"Year 2000 Issues" on page 20.)

TAX RISK is the risk that future legislative or administrative  changes or court
decisions may  materially  affect the ability of the Portfolio to pay tax-exempt
dividends.

More  information  about the risks of investing in the  Portfolio is provided in
"Risks,  Securities and Techniques"  beginning on page 21. You should  carefully
consider  the  risks  discussed  in  these  sections  before  investing  in  the
Portfolio.

Portfolio Performance

The bar  charts  and the  performance  tables  have  been  omitted  because  the
Portfolio has been in operation for less than one calendar year.

PORTFOLIO FEES AND EXPENSES

This table  describes the fees and expenses that you may pay if you buy and hold
Shares of the Portfolio.  Please note that it does not reflect any charges which
may be imposed by The Northern  Trust  Company,  its  affiliates,  correspondent
banks and other  institutions  on their  Customers (as defined on page 11). (For
more information,  please see "Account  Policies and Other  Information" on page
14.)
<TABLE>
<CAPTION>
<S> <C>                                                                          <C>

    SHAREHOLDER FEES (fees paid directly from your investment)
                                                                                 Municipal Portfolio

                                                                                      Shares

    Sales Charge (Load) Imposed on Purchases.................                         None
    Deferred Sales Charge (Load).............................                         None
    Sales Charge (Load) Imposed on Reinvested
        Distributions........................................                         None
    Redemption Fees..........................................                         None
    Exchange Fees............................................                         None

ANNUAL PORTFOLIO OPERATING EXPENSES
(expenses that are deducted from Portfolio assets)1
    Management Fees2.........................................                         0.25%
    Distribution (12b-1) Fees................................                         None
    Other Expenses3..........................................                         0.14%
    Total Annual Portfolio Operating Expenses4...............                         0.39%
</TABLE>

1        The Portfolio's  annual operating expenses are based on actual fees and
         estimated expenses for the current fiscal year.

2        As  of  the  date  of  this  Prospectus,  the  Northern  Trust  Company
         ("Northern")  is voluntarily  waiving a portion of its management  fees
         for the  Portfolio.  As a result of the fee waiver,  actual  management
         fees to be paid by the Portfolio are 0.10% of the  Portfolio's  average
         daily net  assets.  Fee waivers  may be  terminated  at any time at the
         option of Northern.



<PAGE>


3        "Other Expenses" include  co-administration fees and all other ordinary
         operating  expenses of the  Portfolio  not listed  above.  Northern and
         First Data Investor Services Group, Inc. ("First Data Investor Services
         Group") as  co-administrators  are entitled to a co-administration  fee
         from the  Portfolio  at an  annual  rate of  0.10%  of the  Portfolio's
         average daily net assets. Under their Co-Administration  Agreement with
         the  Trust,  which may be amended  without  shareholder  approval,  the
         co-administrators   have  agreed  indefinitely  to  reimburse  expenses
         (including  fees payable to Northern and First Data  Investor  Services
         Group as  co-administrators,  but excluding  management fees,  transfer
         agency fees, servicing fees and extraordinary expenses) which exceed on
         an annualized basis 0.10% of the Portfolio's  average daily net assets.
         As a result of the expense  reimbursement,  estimated  "Other Expenses"
         are currently 0.10% of the Portfolio's average daily net assets.

4        As a  result  of  the  fee  waivers  and  expense  reimbursements,  the
         estimated  actual  management  fees,  distribution  (12b-1) fees, other
         expenses and total annual operating  expenses for the Portfolio for the
         current  fiscal year are set forth below.  Fee waivers  (and  voluntary
         expense reimbursements, if applicable) may be terminated at any time at
         the option of Northern.  If this occurs, "Other Operating Expenses" may
         increase without shareholder approval.
<TABLE>
<CAPTION>
<S><C>                <C>                    <C>                    <C>                  <C>


                                                                                          Total Annual
                       Management            Distribution                                 Operating
                       Fees                  (12b-1) Fees            Other Expenses       Expenses

Municipal   Portfolio  0.10%                 0.00%                   0.10%                0.20%
Shares
</TABLE>

EXAMPLE

The  following  Example is intended to help you compare the cost of investing in
Shares of the Portfolio  (without fee waivers and expense  reimbursements)  with
the cost of investing in other mutual funds.

The  Example  assumes  that you  invest  $10,000 in the  Portfolio  for the time
periods  indicated (with  reinvestment of all dividends and  distributions)  and
then redeem all of your  Shares at the end of those  periods.  The Example  also
assumes that your  investment has a 5% return each year and that the Portfolio's
operating expenses remain the same.  Although your actual costs may be higher or
lower, based on these assumptions your costs would be:

                                                          1 Year       3 Years

MUNICIPAL PORTFOLIO SHARES                                $40          $125



<PAGE>


MANAGEMENT OF THE PORTFOLIO

                                            Investment Adviser

The Northern Trust Company ("Northern" or the "Investment Adviser"), an Illinois
state-chartered  bank and  member  of the  Federal  Reserve  System,  serves  as
investment  adviser for the Portfolio.  The Investment  Adviser is located at 50
South LaSalle Street,  Chicago,  Illinois 60675 and is a wholly-owned subsidiary
of Northern Trust Corporation, a bank holding company. As of September 30, 1999,
Northern Trust Corporation and its subsidiaries had approximately  $33.7 billion
in assets, $19.1 billion in deposits and employed over 8,360 persons.

Northern and its affiliates  administrated in various  capacities  (including as
master trustee, investment manager or custodian) approximately $1.38 trillion of
assets as of  September  30, 1999,  including  approximately  $262.8  billion of
assets  for  which  Northern  and  its  affiliates  had  investment   management
responsibility.  Under its Advisory  Agreement  with the Trust,  the  Investment
Adviser, subject to the general supervision of the Trust's Board of Trustees, is
responsible  for making  investment  decisions for the Portfolio and for placing
purchase and sale orders for portfolio securities.

Advisory Fees

As  compensation  for its  advisory  services  and  its  assumption  of  related
expenses,  the  Investment  Adviser  is  entitled  to an  advisory  fee from the
Portfolio,  computed daily and payable monthly, at an annual contractual rate of
0.25% (expressed as a percentage of the Portfolio's average daily net assets).

The  difference,  if any,  between the  contractual  advisory fee and the actual
advisory fee that is paid by the  Portfolio  will  reflect  that the  Investment
Adviser  did not  charge  the full  amount of the  advisory  fee to which it was
entitled.  The  Investment  Adviser  may  discontinue  or modify  its  voluntary
limitation in the future at its discretion.

Portfolio Management

The Investment  Adviser employs a team approach to the investment  management of
the Portfolio,  relying upon  investment  professionals  under the leadership of
James M.  Snyder,  Chief  Investment  Officer and  Executive  Vice  President of
Northern.  Mr. Snyder  oversees the  management of all fixed income,  equity and
money  market  assets  managed by the  Investment  Adviser.  Mr.  Snyder  joined
Northern Trust in 1980.

Other Portfolio Services

Northern also serves as transfer agent ("Transfer  Agent") and custodian for the
Portfolio. As Transfer Agent, Northern performs various administrative servicing
functions, and any shareholder inquiries should be directed to it. The fees that
Northern  receives for its  services in those  capacities  are  described in the
Statement of Additional  Information.  Northern and First Data Investor Services
Group, Inc. ("First Data Investor Services"), a wholly-owned subsidiary of First
Data Corporation,  serve as co-administrators  for the Portfolio.  The fees that
Northern and First Data Investor  Services  receive for their  services in these
capacities are described on page 8 under "Portfolio Fees and Expenses."


<PAGE>


PURCHASING AND SELLING SHARES
- ------------------------------------------------------------------------

Investors

Institutional  investors,  which are  acting on their own behalf or on behalf of
their customers, clients, employees,  participants and others ("Customers"), may
invest in the Portfolio through their  institutional  accounts at Northern or an
affiliate. They may also establish accounts directly with the Trust. There is no
sales charge imposed on investments.  Institutional  investors  ("Institutions")
include:

      Northern and its affiliates;

      Defined contribution plans having at least $30 million in assets or annual
     contributions of at least $5 million; and

      Other institutions and organizations.
- ------------------------------------------------------------------------

Share Classes

The  Portfolio  offers  three  classes  of shares to meet the  special  needs of
institutional investors:

      Shares (described in this Prospectus)

      Service Shares (described in a separate Prospectus)

      Premier Shares (described in a separate Prospectus)

Shares of each class bear their pro rata portion of all operating  expenses paid
by the Portfolio,  except  amounts  payable under the Service Plan that has been
adopted  for the  Portfolio's  Service  Shares and Premier  Shares and  transfer
agency fees. Because of these  class-specific  expenses,  the performance of the
Shares of the  Portfolio  described in this  Prospectus is expected to be higher
than the  performance  of both the  Service  Shares  and  Premier  Shares of the
Portfolio and the performance of the  Portfolio's  Service Shares is expected to
be higher than the performance of the Premier Shares.
- ------------------------------------------------------------------------

Opening An Account

You may purchase Shares of the Portfolio through your  institutional  account at
Northern (or an  affiliate)  or you may open an account  directly with the Trust
with a minimum initial investment of $5 million in one or more portfolios of the
Trust.  This  minimum does not apply,  however,  to Shares  purchased  through a
Northern cash sweep program. There is no minimum for subsequent investments.

Through an Institutional Account. If you are opening an institutional account at
Northern,  a  Northern  representative  can  assist  you with all phases of your
investment.  To purchase  Shares  through your  account,  contact your  Northern
representative for further information.

Directly  from the Trust.  An  Institution  may open a  shareholder  account and
purchase Shares directly from the Trust as described in this Prospectus.
- ------------------------------------------------------------------------

By Mail.

Read this Prospectus carefully.

Complete and sign the new account application.

Include a  certified  corporate  resolution  (or other  acceptable  evidence  of
authority).

Enclose a check or Federal Reserve draft payable to the Portfolio.

Mail your check, corporate resolution and completed application to:

        Northern Institutional Funds
        c/o The Northern Trust Company
        P.O. Box 75943
        Chicago, Illinois 60675-5943

All checks must be payable in U.S.  dollars  and drawn on a bank  located in the
United   States.   Cash   and   third   party   checks   are   not   acceptable.
- ------------------------------------------------------------------------

By Telephone.

Read this Prospectus carefully.

Call the Transfer Agent at 1-800-637-1380.

To open a new account please provide:

o      The name of the Portfolio in which you'd like to invest

o      The number of Shares or dollar amount to be invested

o      The method of payment

To add to an existing account, please provide:

o      The Institution's name

o      Your Account Number

By Wire or Automated Clearing House Transfer ("ACH Transfer").

To open a new account:

Call the Transfer Agent at 1-800-637-1380 for instructions.

For more  information  about the purchase of Shares,  call the Transfer Agent at
1-800-637-1380.

To add to an existing account:

Have your bank wire Federal funds or effect an ACH Transfer to:

        The Northern Trust Company
        Chicago, Illinois
        ABA Routing No. 0710-00152
        (Reference 10 Digit Portfolio Account No.)
        (Reference Shareholder's Name)
- ------------------------------------------------------------------------

Selling Shares

Through an Institutional Account.  Institutions may sell (redeem) Shares through
their institutional account by contacting their Northern account representative.

Directly through the Trust.  Institutions that purchase Shares directly from the
Trust may redeem their Shares through the Transfer Agent in one of the following
ways:

By Mail.

Send a written request to:

        Northern Institutional Funds
        c/o The Northern Trust Company
        P.O. Box 75943
        Chicago, Illinois 60675-5943

The letter of instruction must include:

o      The signature of a duly authorized person

o      Your account number

o      The name of the Portfolio

o      The number of Shares or the dollar amount to be redeemed



<PAGE>


By Telephone.

      Call the Transfer Agent at 1-800-637-1380 for instructions.

      During  periods  of  unusual  economic  or  market   activity,   telephone
     redemptions  may be difficult  to  implement.  In such event,  shareholders
     should follow the procedures outlined above under "Selling Shares By Mail."

By Wire.

o    Call the Transfer Agent at 1-800-637-1380 for instructions.

      You must have given authorization for expedited wire redemption.

o The minimum amount that may be redeemed by this method is $10,000.

ACCOUNT POLICIES AND OTHER INFORMATION

Automatic  Investment  Arrangements.  Institutions  may purchase  Shares through
their   institutional   accounts  at  Northern  either  by  directing  automatic
investment  of cash  balances  in excess of certain  agreed  upon  amounts or by
directing  investments from time to time on a non-automatic basis. Northern will
place a purchase order generated under an automatic  investment direction either
on the  Business  Day that  funds are  available  in the  account or on the next
Business Day, depending upon the terms of the automatic investment  arrangement.
Similarly,  Northern will place a redemption  order generated under an automatic
investment  direction  either  on  the  Business  Day  Northern  calculates  the
redemption  amount  needed to bring the  account  balance up to the agreed  upon
amount or on the next  Business Day,  depending  upon the terms of the automatic
investment  arrangement.  If a redemption  order is placed on the next  Business
Day,  Northern  will  normally  provide  funds by  provisionally  crediting  the
Institution's  account on the day the calculation is made.  Institutions  should
contact  Northern  for  more  information   about  their  automatic   investment
arrangements.

Purchase and Redemption  Minimums.  There is a minimum initial  investment of $5
million in the  Portfolio  and one or more other  investment  portfolios  of the
Trust.  This  minimum does not apply,  however,  to Shares  purchased  through a
Northern cash sweep program. There is no minimum for subsequent  investments.  A
$10,000 minimum applies for redemptions by wire. The Trust reserves the right to
waive  purchase and  redemption  minimums and to determine the manner in which a
minimum is satisfied.

Calculating Share Price. The Trust issues Shares and redeems Shares at net asset
value  ("NAV").  The NAV for each share class of the  Portfolio is calculated by
dividing  the value of net  assets  attributed  to that  class by the  number of
outstanding  shares  of the  class.  The NAV  for the  Portfolio  and  class  is
calculated  as of 3:00 p.m.,  Chicago  time,  each Business Day. The NAV used in
determining the price of your Shares is the one calculated  after your purchase,
exchange or redemption order is received or accepted as described below.

The  Portfolio  seeks to  maintain  an NAV of $1.00  per  share by  valuing  the
obligations  held by it at amortized  cost in accordance  with SEC  regulations.
Amortized cost will normally approximate market value.

Timing of Purchase  Requests.  Requests  accepted by the Transfer Agent or other
authorized  intermediary by 1:00 p.m., Chicago time, on any Business Day will be
executed the same day, provided that either:

o        The Transfer  Agent  receives  the  purchase  price in Federal or other
         immediately  available funds prior to 1:00 p.m., Chicago time, the same
         Business Day;

o        The order is accepted by an authorized  intermediary  and payment is to
         be made by the  close  of the same  Business  Day in  Federal  or other
         immediately  available funds according to procedures  authorized by the
         Trust; or

o        Payment in Federal or other immediately  available funds is received by
         the  close  of  the  same  Business  Day  in an  institutional  account
         maintained with Northern or an affiliate.

Orders  received by the Transfer  Agent or other  authorized  intermediary  on a
non-Business  Day or after 1:00 p.m.,  Chicago  time,  on a Business Day will be
executed on the next Business Day, provided that payment is made as noted above.
We consider  requests  to be in "good  order" when all  required  documents  are
properly  completed,  signed  and  received,  including  a  certified  corporate
resolution or other acceptable evidence of authority. If an Institution pays for
Shares by check,  Federal  funds  generally  will  become  available  within two
Business Days after a purchase order is received.

If payment is not received as described above from an authorized intermediary on
the same Business Day of acceptance of an order by the authorized  intermediary,
the  authorized  intermediary  may  be  liable  for  fees  and  losses  and  the
transaction may be cancelled.

In  certain  circumstances,  the Trust may  advance  the time by which  purchase
orders must be received. See "Early Closings" on page 18.

Tax Identification  Number.  Federal  regulations  require you to provide to the
Transfer  Agent a  taxpayer  identification  number  when you  open an  account.
Purchase  orders  without such a number or an indication  that a number has been
applied for will not be  accepted.  If you have  applied for a number,  you must
provide it to the Transfer Agent within 60 days of the date of the order.

In-Kind  Purchases  and  Redemptions.  The  Trust  reserves  the right to accept
payment for Shares in the form of securities  that are  permissible  investments
for the  Portfolio.  The Trust also reserves the right to pay  redemptions  by a
distribution  "in-kind" of securities (instead of cash) from the Portfolio.  See
the Statement of Additional  Information for further information about the terms
of these purchases and redemptions.

Miscellaneous Purchase Information.

o        Institutions  are responsible for  transmitting  purchase orders to the
         Transfer Agent and delivering required funds on a timely basis.

o        Institutions  are  responsible  for  all  losses  and  expenses  of the
         Portfolio in the event of any failure to make payment  according to the
         procedures outlined in this Prospectus. Northern may redeem shares from
         any account it maintains to protect the Portfolio and Northern  against
         loss.  In  addition,  a $20 charge  will be imposed if a check does not
         clear.

o        Shares of the Portfolio  are entitled to the dividends  declared by the
         Portfolio beginning on the Business Day the purchase order is executed,
         provided  payment in Federal or other  immediately  available  funds is
         received by the Transfer Agent by the time designated above.

o        The Trust  reserves the right to reject any purchase  order.  The Trust
         also  reserves the right to change or  discontinue  any of its purchase
         procedures.

Timing of Redemption and Exchange  Requests.  Redemption  and exchange  requests
will be effected at the NAV next  determined  after your  exchange or redemption
order is received in good order.  Good order means that the request includes the
following:  the account number and Portfolio name; the amount of the transaction
(as  specified in dollars or shares);  and the  signature  of a duly  authorized
person (except for telephone and wire  redemptions).  See "Account  Policies and
Other Information -- Making Changes to Your Account Information."

If either the Transfer  Agent or Northern  (with  respect to your  institutional
account)  receives a redemption order by 1:00 p.m.,  Chicago time, on a Business
Day,  redemption  proceeds  will  normally  be paid in  Federal  funds  or other
immediately  available funds wired or sent by check to you or, if you so choose,
to your institutional account with Northern, on the same Business Day.

Redemption  orders received after 1:00 p.m.,  Chicago time, will be effected the
next Business Day. Proceeds for redemption orders received on a non-Business Day
will normally be sent on the next Business Day after receipt in good order.

In certain circumstances, the Trust may advance the time by which redemption and
exchange orders must be received. See "Early Closings" on page 18.

Miscellaneous  Redemption  Information.  All redemption proceeds will be sent by
check unless the Transfer Agent is directed  otherwise.  Redemption proceeds may
also be wired.  A redemption  request may not be processed if a shareholder  has
failed to submit a completed  and  properly  executed  new account  application,
including a corporate resolution or other acceptable evidence of authority.

o        The Trust  reserves  the right to defer  crediting,  sending  or wiring
         redemption  proceeds for up to 7 days after  receiving  the  redemption
         order if, in its judgment,  an earlier payment could  adversely  affect
         the Portfolio.

o        If you are redeeming recently purchased Shares, your redemption request
         may not be  honored  until  your check or  electronic  transaction  has
         cleared. This may delay your transaction for up to 15 days.

o        Institutions are responsible for transmitting  redemption orders to the
         Transfer Agent and crediting their Customers'  accounts with redemption
         proceeds on a timely basis.

o        Redemption  requests by mail must be signed by a person  authorized  by
         acceptable documentation on file with the Transfer Agent.

o        Dividends on Shares are earned  through and  including the day prior to
         the day on which they are redeemed.

o        The Trust  reserves the right to redeem Shares held by any  shareholder
         who provides incorrect or incomplete  account  information or when such
         involuntary  redemptions are necessary to avoid adverse consequences to
         the Trust and its shareholders.

o        The Trust may require any  information  reasonably  necessary to ensure
         that a redemption request has been duly authorized.

o        The Trust reserves the right to change or discontinue any of its
          redemption procedures.

Exchange  Privileges.  Institutions and their Customers (to the extent permitted
by their account  agreements) may exchange Shares of the Portfolio for Shares of
another portfolio. The registration of both accounts involved must be identical.
A $1,000 minimum investment  applies.  An exchange is a redemption of shares you
own and the  purchase of shares you are  acquiring.  It is  considered a taxable
event and may result in a gain or loss.

The Trust reserves the right to change or discontinue the exchange  privilege at
any time upon 60 days' written notice to shareholders and to reject any exchange
request. Exchanges are only available in states where an exchange can legally be
made.  Before making an exchange you should read the  prospectus  for the shares
you are acquiring.

Telephone Transactions. For your protection,  telephone requests may be recorded
in order to verify their accuracy.  In addition,  the Transfer Agent has adopted
procedures in an effort to establish  reasonable  safeguards  against fraudulent
telephone  transactions.  If  reasonable  measures  are  taken  to  verify  that
telephone instructions are genuine, the Trust and its service providers will not
be  responsible   for  any  loss  resulting  from   fraudulent  or  unauthorized
instructions received over the telephone.  In these circumstances,  shareholders
will bear the risk of loss.  During periods of unusual market activity,  you may
have trouble  placing a request by telephone.  In this event,  consider  sending
your request in writing.

The proceeds of redemption  orders  received by telephone will be sent by check,
wire or  transfer  according  to proper  instructions.  All checks  will be made
payable  to the  shareholder  of record  and  mailed  only to the  shareholder's
address of record.

The Trust reserves the right to refuse a telephone redemption.

Advance  Notification  of  Large  Transactions.   The  Trust  requests  that  an
Institution  give advance  notice to the Transfer  Agent by 11:00 a.m.,  Chicago
time,  if it intends to place a purchase  or  redemption  order of $5 million or
more on a Business Day.

Making  Changes  to Your  Account  Information.  You may make  changes to wiring
instructions,  address of record, or other account  information only in writing.
These  instructions  must be  accompanied by a certified  corporate  resolution,
signature  guarantee  from an  institution  participating  in the Stock Transfer
Agency Medallion Program ("STAMP"),  or other acceptable  evidence of authority.
In accordance  with SEC  regulations,  the Trust and Transfer Agent may charge a
shareholder reasonable costs in locating a shareholder's current address.

Business Day. A "Business  Day" is each Monday  through  Friday when Northern or
the New York Stock  Exchange is open for  business.  A  "Business  Day" does not
include a holiday observed by Northern and the Exchange.  In 1999 these holidays
are: New Year's Day, Martin Luther King, Jr. Day, Presidents' Day, Memorial Day,
Independence Day, Labor Day, Thanksgiving and Christmas Day.

Early  Closings.  The Portfolio  reserves the right to cease,  or to advance the
time for,  accepting  purchase,  redemption or exchange orders for same Business
Day credit when  Northern or the  Exchange  closes  early as a result of unusual
weather or other  conditions.  It also  reserves this right when The Bond Market
Association recommends that securities markets close or close early.

Authorized   Intermediaries.   The  Trust  may   authorize   certain   financial
intermediaries  (including  banks,  trust  companies,   brokers  and  investment
advisers),  which provide  recordkeeping,  reporting and processing services, to
accept  purchase,  redemption and exchange orders from their Customers on behalf
of the  Trust.  They may also  designate  other  intermediaries  to accept  such
orders, if approved by the Trust. Authorized  intermediaries are responsible for
transmitting  orders and delivering  funds on a timely basis. The Portfolio will
be deemed to have received an order when the order is accepted by the authorized
intermediary  on a Business Day, and the order will be priced at the Portfolio's
per share NAV next determined.

Information  About   Institutions.   Customers   purchasing  Shares  through  an
Institution  should read their account  agreements  carefully.  An Institution's
requirements may differ from those listed in this Prospectus. An Institution may
impose account charges, such as asset allocation fees, account maintenance fees,
and other  charges  that will  reduce  the net  return on an  investment  in the
Portfolio.  If a Customer has agreed with a particular Institution to maintain a
minimum  balance with the  Institution and the balance falls below this minimum,
the  Customer may be required to redeem all or a part of his  investment  in the
Portfolio.

Northern  may  provide  compensation  to  certain  dealers  and other  financial
intermediaries  who provide  services to their Customers who invest in the Trust
or whose Customers purchase significant amounts of Shares of the Portfolio.  The
amount of such compensation may be made on a one-time and/or periodic basis, and
may  represent  all or a  portion  of the  annual  fees  earned by  Northern  as
Investment  Adviser  (after  adjustments).  This  compensation  will  be paid by
Northern or its affiliates  and will not represent an additional  expense to the
Trust or its shareholders.

State  securities  laws  regarding the  registration  of dealers may differ from
Federal law. As a result,  Institutions  investing in the Portfolio on behalf of
their Customers may be required to register as dealers.



<PAGE>


DISTRIBUTIONS AND TAXES

DISTRIBUTIONS

Dividends  from net income are declared  daily and paid monthly by the Portfolio
to its shareholders. Net income includes the interest accrued on the Portfolio's
assets less estimated expenses.  The Portfolio's net realized short-term capital
gains, if any, are distributed at least annually.  The Portfolio does not expect
to realize net long-term capital gain.

Dividends are paid as soon as practical  following the end of each month, except
in the case of a total redemption of Shares in an account that is not subject to
a standing order for the purchase of additional Shares. In that event, dividends
will be paid promptly along with the redemption proceeds.

All  distributions are  automatically  reinvested  (without any sales charge) in
additional Shares of the Portfolio, unless you elect to receive distributions in
cash by notifying the Transfer Agent in writing.  You may make  arrangements  to
credit these distributions to your account with Northern,  its affiliates or its
correspondent banks.

There are no fees or sales charges on reinvestments.

TAXES

The Portfolio intends to qualify as a regulated  investment  company for Federal
tax purposes,  and to distribute to  shareholders  substantially  all of its net
investment  income and net capital gain. There are certain tax requirements that
the Portfolio must follow in order to avoid Federal taxation.  In its efforts to
adhere to these  requirements,  the Portfolio  may have to limit its  investment
activity in some types of instruments.

The  Portfolio  expects to pay  "exempt-interest  dividends"  that are generally
exempt from regular Federal income tax.  However,  a significant  portion of the
exempt-interest  dividends  paid  by  the  Portfolio  will  be an  item  of  tax
preference  for  purposes  of  determining   Federal   alternative  minimum  tax
liability.  Exempt-interest  dividends will also be considered  along with other
adjusted  gross income in  determining  whether any Social  Security or railroad
retirement payments received by you are subject to Federal income taxes.

If you receive an  exempt-interest  dividend  with  respect to any share and the
share is held for six months or less,  any loss on the sale or  exchange  of the
share will be  disallowed  to the extent of the  dividend  amount.  Interest  on
indebtedness  incurred  by a  shareholder  to  purchase  or carry  shares of the
Portfolio generally will not be deductible for federal income tax purposes.

Except as stated below, you may be subject to state and local taxes on Portfolio
distributions. State income taxes may not apply, however, to the portions of the
Portfolio's distributions,  if any, that are attributable to interest on certain
types of Federal  securities or interest on securities  issued by the particular
state or municipalities within the state.

In all cases,  distributions,  if any, derived from net long-term  capital gains
will generally be taxable to you as long-term  capital gains,  and any dividends
derived  from  short-term  capital  gains and  taxable  interest  income will be
taxable to you as ordinary income.

OTHER TAX INFORMATION

Dividends and  distributions  from the Portfolio will generally be reportable by
you in the tax year in which they are paid,  with one  exception.  Dividends and
distributions  declared by the  Portfolio  in October,  November or December and
paid in January are taxed as though they were paid by December 31.

Every year, the Trust will send you information detailing the amount of ordinary
income and capital gains distributed to your account for the previous year.

Your  investment in the Portfolio could have  additional tax  consequences.  You
should  consult your tax  professional  for  information  regarding  all the tax
consequences applicable to your investment in the Portfolio. More information is
provided in the Statement of Additional  Information.  This short summary is not
intended as a substitute for careful tax planning.

Dividends  paid by the  Portfolio  may be  taxable  under  state or local law as
dividend  income even though all or a portion of such  dividends  may be derived
from interest on obligations which, if realized  directly,  would be exempt from
such income taxes.

Year 2000 Issues

Like every other business  dependent upon computerized  information  processing,
Northern Trust Corporation ("Northern Trust") must deal with "Year 2000" issues.

Many  computer  systems use two digits  rather  than four to identify  the year.
Unless adapted,  these systems may not be able to correctly distinguish the Year
2000 from the Year 1900. As the Year 2000 approaches, many systems may be unable
to  accurately  process  certain  date-based  information,  which  could cause a
variety  of  operational  problems  for  businesses.  This could have a negative
effect on the  companies in which the Portfolio  invests,  thus  decreasing  the
Portfolio's investment returns.

Northern Trust has implemented  steps to prepare its critical  computer  systems
and processes for Year 2000 processing. It has established a dedicated Year 2000
Project Team whose members have significant  systems development and maintenance
experience.  Northern Trust's Year 2000 project includes a comprehensive testing
plan of its critical  systems.  Northern Trust has advised the Trust that it has
substantially  completed  work on its critical  systems and testing with outside
parties.

Northern  Trust also has a program to  monitor  and assess the  efforts of other
parties,  such as other service providers to the Portfolio.  However,  it cannot
control the success of those other parties' efforts. Contingency plans are being
established to provide  Northern Trust with  alternatives in case these entities
experience significant Year 2000 difficulties that impact Northern Trust.

Furthermore,  even if the actions taken by Northern  Trust are  successful,  the
normal operations of the Portfolio may, in any event, be disrupted significantly
by the failure of  communications  and public  utility  companies,  governmental
entities,  financial  processors or others to perform their services as a result
of Year 2000 problems.


<PAGE>


Efforts in foreign  countries to remediate  potential Year 2000 problems are not
as extensive  as those in the United  States.  As a result,  the  operations  of
foreign markets, foreign issuers and foreign governments may be disrupted by the
Year 2000 problem and the investment  holdings of the Portfolio may be adversely
affected.

RISKS, SECURITIES AND TECHNIQUES

This section takes a closer look at some of the types of securities in which the
Portfolio  may invest and their  related  risks.  It also  explores  the various
investment  techniques  that the  investment  management  team  may,  but is not
required to, use. The Portfolio may invest in other  securities  and are subject
to further  restrictions  and risks  which are  described  in the  Statement  of
Additional Information.

ASSET-BACKED SECURITIES.  Asset-backed securities are sponsored by entities such
as government agencies,  banks, financial companies and commercial or industrial
companies.  Asset-backed securities represent  participations in, or are secured
by and payable from,  pools of various  types of real and personal  property and
other  financial  assets.  Such asset pools are  securitized  through the use of
privately   formed  trusts  or  special   purpose   corporations.   Payments  or
distributions  of principal and interest may be guaranteed up to certain amounts
and for a certain time period by a letter of credit or a pooled insurance policy
issued by a financial institution, or other credit enhancements.

     INVESTMENT   STRATEGY.   The  Portfolio  may  purchase   various  types  of
          asset-backed  securities that are "Eligible  Securities" as defined by
          the SEC.

       SPECIAL  RISKS.  In  addition  to credit  and market  risk,  asset-backed
       securities  involve prepayment risk because the underlying assets (loans)
       may be prepaid at any time. The value of these securities may also change
       because of actual or  perceived  changes in the  creditworthiness  of the
       originator,  the servicing agent, the financial institution providing the
       credit support, or the counterparty.  Like other fixed income securities,
       when interest rates rise, the value of an asset-backed security generally
       will decline.  However,  when  interest  rates  decline,  the value of an
       asset-backed  security with prepayment  features may not increase as much
       as that of other  fixed  income  securities.  In  addition,  non-mortgage
       asset-backed   securities   involve   certain   risks  not  presented  by
       mortgage-backed securities.  Primarily, these securities may not have the
       benefit of the same security interest in the underlying collateral.

BORROWINGS  AND REVERSE  REPURCHASE  AGREEMENTS.  The Portfolio may borrow money
from banks and may enter into reverse repurchase agreements with banks and other
financial institutions.  Reverse repurchase agreements involve the sale of money
market  securities held by the Portfolio  subject to its agreement to repurchase
them at a mutually agreed upon date and price (including interest).

       INVESTMENT  STRATEGY.  The  Portfolio  may borrow and enter into  reverse
       repurchase  agreements  in amounts not  exceeding  one-third of its total
       assets (including the amount borrowed). These transactions may be entered
       into as a temporary measure for emergency  purposes or to meet redemption
       requests. Reverse repurchase agreements may also be entered into when the
       investment  management team expects that the interest income to be earned
       from the investment of the transaction  proceeds will be greater than the
       related interest expense.


<PAGE>


33


       SPECIAL  RISKS.  Borrowings  and reverse  repurchase  agreements  involve
       leveraging.  If the  securities  held by the  Portfolio  decline in value
       while  these  transactions  are  outstanding,  the net asset value of the
       Portfolio's  outstanding  shares will decline in value by proportionately
       more than the decline in value of the  securities.  In addition,  reverse
       repurchase  agreements  involve the risks that the interest income earned
       by the Portfolio  (from the investment of the proceeds) will be less than
       the  interest  expense of the  transaction,  that the market value of the
       securities  sold by the  Portfolio  will  decline  below  the  price  the
       Portfolio is obligated to pay to repurchase the securities,  and that the
       securities may not be returned to the Portfolio.

DERIVATIVES.  The Portfolio may purchase  certain  "derivative"  instruments.  A
derivative  is a financial  instrument  whose value is derived  from -- or based
upon -- the  performance  of  underlying  assets,  interest  rates,  or indices.
Derivatives include structured debt obligations such as asset-backed securities,
"stripped" securities and various floating rate instruments.

       INVESTMENT STRATEGY. The Portfolio will invest in derivatives only if the
       potential   risks  and  rewards  are  consistent   with  the  Portfolio's
       objective, strategies and overall risk profile.

       SPECIAL  RISKS.  Engaging in  derivative  transactions  involves  special
       risks,  including  (a)  market  risk  that  the  Portfolio's  derivatives
       position will lose value;  (b) credit risk that the  counterparty  to the
       transaction  will  default;  (c)  leveraging  risk  that the value of the
       derivative  instrument  will decline more than the value of the assets on
       which it is based; (d) illiquidity risk that the Portfolio will be unable
       to sell its position  because of lack of market depth or disruption;  (e)
       pricing risk that the value of a derivative  instrument will be difficult
       to determine; and (f) operations risk that loss will occur as a result of
       inadequate  systems or human error.  Many types of derivatives  have been
       recently  developed and have not been tested over complete market cycles.
       For these  reasons,  the  Portfolio  may suffer a loss whether or not the
       analysis of the investment management team is accurate.

DOWNGRADED  SECURITIES.  After  its  purchase,  the  portfolio  security  may be
assigned a lower rating or cease to be rated. If this occurs,  the Portfolio may
continue to hold the issue if the Investment  Adviser believes it is in the best
interest of the Portfolio and its shareholders.

ILLIQUID OR RESTRICTED SECURITIES.  Illiquid securities include certain variable
amount  master  demand  notes that cannot be called  within seven days and other
securities  that are traded in the U.S. but are subject to trading  restrictions
because they are not  registered  under the  Securities  Act of 1933, as amended
(the "1933 Act").

       INVESTMENT STRATEGY. The Portfolio may invest up to 10% of its net assets
       in securities that are illiquid.  A domestically traded security which is
       not registered under the 1933 Act will not be considered  illiquid if the
       Investment  Adviser determines that an adequate trading market exists for
       that security.  If otherwise consistent with their investment  objectives
       and policies, the Portfolio may purchase commercial paper issued pursuant
       to Section 4(2) of the 1933 Act and  securities  that are not  registered
       under the 1933 Act but can be sold to "qualified institutional buyers" in
       accordance  with Rule 144A under the 1933 Act. These  securities will not
       be  considered  illiquid so long as the  Investment  Adviser  determines,
       under  guidelines  approved by the  Trust's  Board of  Trustees,  that an
       adequate trading market exists.

       SPECIAL  RISKS.  Because  illiquid  and  restricted   securities  may  be
       difficult to sell at an acceptable  price, they may be subject to greater
       volatility  and may result in a loss to the  Portfolio.  The  practice of
       investing  in Rule  144A  Securities  could  increase  the  level  of the
       Portfolio's  illiquidity  during any period that qualified  institutional
       buyers become uninterested in purchasing these securities.

INVESTMENT  COMPANIES.  In  connection  with the  management  of its daily  cash
positions,  the Portfolio may invest in shares of other money market funds which
invest in short-term,  high quality debt  securities  and  securities  issued by
other  investment  companies  consistent  with  its  investment  objectives  and
policies.

       INVESTMENT  STRATEGY.  Investments by the Portfolio in other money market
       funds will be subject to the limitations of the Investment Company Act of
       1940.  Although the Portfolio does not expect to do so in the foreseeable
       future,  the Portfolio is authorized to invest  substantially  all of its
       assets in an open-end  investment  company  that has the same  investment
       objective, policies and fundamental restrictions as the Portfolio.

       SPECIAL  RISKS.  As a  shareholder  of another  investment  company,  the
       Portfolio  would be subject to the same  risks as any other  investor  in
       that  company.  It would also bear a  proportionate  share of any fees or
       expenses paid by that company. These expenses would be in addition to the
       advisory  fees  and  other  expenses  the  Portfolio  bears  directly  in
       connection with its own operations.

MUNICIPAL  AND  RELATED   INSTRUMENTS.   Municipal   instruments   include  debt
obligations issued by or on behalf of states, territories and possessions of the
United  States  and their  political  subdivisions,  agencies,  authorities  and
instrumentalities.

Municipal  instruments  include both  "general" and  "revenue"  bonds and may be
issued to obtain funds for various  public  purposes.  General  obligations  are
secured by the  issuer's  pledge of its full  faith,  credit  and taxing  power.
Revenue obligations are payable only from the revenues derived from a particular
facility or class of facilities.  In some cases,  revenue bonds are also payable
from the proceeds of a special excise or other  specific  revenue source such as
lease  payments  from the user of a  facility  being  financed.  Some  municipal
instruments, known as private activity bonds, are issued to finance projects for
private companies.  Private activity bonds are usually revenue obligations since
they are typically payable by the private user of the facilities financed by the
bonds.

Municipal  instruments also include "moral obligation" bonds,  municipal leases,
certificates of participation and custodial receipts. Moral obligation bonds are
supported  by a  moral  commitment  but  not a legal  obligation  of a state  or
municipality.  Municipal leases and participation  certificates present the risk
that the state or municipality  involved will not appropriate the monies to meet
scheduled payments on an annual basis. Custodial receipts represent interests in
municipal instruments held by a trustee.

The  Portfolio  may acquire  "stand-by  commitments"  relating to the  municipal
instruments it holds. Under a stand-by commitment,  a dealer agrees to purchase,
at the Portfolio's option, specified municipal instruments at a specified price.
A stand-by  commitment may increase the cost,  and thereby reduce the yield,  of
the municipal  instruments to which the commitment  relates.  The Portfolio will
acquire stand-by commitments solely to facilitate portfolio liquidity and do not
intend to exercise their rights for trading purposes.

           INVESTMENT  STRATEGY.  Although  it is not  the  Portfolio's  current
           policy  to  do  so  on  a  regular  basis,  in  connection  with  its
           investments in municipal  instruments,  the Portfolio may invest more
           than 25% of its total  assets in municipal  instruments  the interest
           upon which is paid solely by  governmental  issuers from  revenues of
           similar  projects.  However,  the Portfolio does not intend to invest
           more  than  25% of  the  value  of its  total  assets  in  industrial
           development bonds or similar  obligations where the  non-governmental
           entities supplying the revenues to be paid are in the same industry.

           SPECIAL RISKS.  Municipal  instruments purchased by the Portfolio may
           be backed by letters of credit,  insurance  or other  forms of credit
           enhancement issued by foreign (as well as domestic) banks,  insurance
           companies and other financial institutions.  If the credit quality of
           these banks, insurance companies and financial institutions declines,
           the Portfolio could suffer a loss to the extent that the Portfolio is
           relying upon this credit support.  Foreign  institutions  can present
           special risks relating to higher  transaction and custody costs,  the
           imposition of additional taxes by foreign governments,  less complete
           financial information,  less market liquidity, more market volatility
           and political  instability.  Foreign banks,  insurance  companies and
           financial  institutions  may be  subject  to less  stringent  reserve
           requirements, and to different accounting, auditing and recordkeeping
           requirements than U.S banks.

           In addition,  when a substantial portion of the Portfolio's assets is
           invested  in  instruments  which  are  used  to  finance   facilities
           involving a particular industry,  whose issuers are in the same state
           or  which  are  otherwise  related,  there is a  possibility  that an
           economic,  business or political development affecting one instrument
           would likewise affect the related instrument.

SECURITIES  LENDING.  In order to generate  additional income, the Portfolio may
lend  securities  on a short-term  basis to banks,  brokers and dealers or other
qualified institutions. In exchange, the Portfolio will receive collateral equal
to at least 100% of the value of the securities loaned.

       INVESTMENT  STRATEGY.  Securities  lending  may  represent  no more  than
       one-third the value of the Portfolio's  total assets  (including the loan
       collateral).  Any cash collateral received by the Portfolio in connection
       with these loans may be invested in U.S. government  securities and other
       liquid high-grade debt obligations.

       SPECIAL RISKS.  The main risk when lending  portfolio  securities is that
       the borrower might become  insolvent or refuse to honor its obligation to
       return the  securities.  In this event,  the Portfolio  could  experience
       delays in  recovering  its  securities  and may possibly  incur a capital
       loss. In addition, the Portfolio may incur a loss in reinvesting the cash
       collateral it receives.

STRIPPED  OBLIGATIONS.  These  securities are issued by  governmental  entities,
banks and other  financial  institutions.  They  entitle  the  holder to receive
either interest payments or principal  payments that have been "stripped" from a
debt obligation.

     INVESTMENT  STRATEGY.   To  the  extent   consistent  with  its  investment
          objective, the Portfolio may purchase stripped securities.

       SPECIAL  RISKS.  Stripped  securities are very sensitive to interest rate
       changes and to the rate of principal  prepayments.  A rapid or unexpected
       increase  in  prepayments  could  depress  the price of certain  stripped
       securities and adversely affect the Portfolio's total return.

TAXABLE  INVESTMENTS.   Taxable  investments  include  U.S.   dollar-denominated
obligations of U.S. banks,  foreign  commercial  banks and securities  issued or
guaranteed  by foreign  governments;  high  quality  commercial  paper and other
obligations;  high quality corporate bonds and notes;  asset-backed  securities;
securities  issued  or  guaranteed  by the  U.S.  government,  its  agencies  or
instrumentalities  and related  custodial  receipts;  and repurchase  agreements
relating to the above instruments.

                      INVESTMENT STRADEGY. The Portfolio may invest from time to
                      time,  on a  temporary  basis or for  temporary  defensive
                      purposes,  in  short-term  taxable  instruments  that  are
                      "Eligible  Securities"  as  defined  by the SEC for  money
                      market funds.

                      SPECIAL  RISKS.  Dividends  paid by the Portfolio that are
                      derived from  interest  paid on taxable  investments  will
                      generally be taxable to the  Portfolio's  shareholders  as
                      ordinary  income  for  Federal  income tax  purposes.  The
                      Portfolio may not achieve its  investment  objective  when
                      its assets are invested in taxable obligations.

VARIABLE AND FLOATING RATE  INSTRUMENTS.  Variable and floating rate instruments
have interest rates that are  periodically  adjusted  either at set intervals or
that  float  at  a  margin  above  a  generally  recognized  index  rate.  These
instruments  include  long-term  variable  and  floating  rate bonds  (sometimes
referred to as "Put Bonds") where the Portfolio  obtains at the time of purchase
the  right  to put the  bond  back to the  issuer  or a third  party at par at a
specified date.

             INVESTMENT STRATEGY.  The Portfolio may invest in rated and unrated
             variable and floating  rate  instruments  to the extent  consistent
             with its investment objective. Unrated instruments may be purchased
             by the Portfolio if they are determined by the  Investment  Adviser
             to be of  comparable  quality  to rated  instruments  eligible  for
             purchase by the Portfolio.

             SPECIAL  RISKS.  Because  there is no active  secondary  market for
             certain  variable and floating rate  instruments,  they may be more
             difficult to sell if the issuer defaults on its payment obligations
             or during  periods  when the  Portfolio is not entitled to exercise
             its demand rights.

WHEN-ISSUED SECURITIES, DELAYED DELIVERY TRANSACTIONS AND FORWARD COMMITMENTS. A
purchase of "when-issued"  securities refers to a transaction made conditionally
because the securities, although authorized, have not yet been issued. A delayed
delivery or forward  commitment  transaction  involves a contract to purchase or
sell  securities  for a fixed  price  at a  future  date  beyond  the  customary
settlement period.

       INVESTMENT  STRATEGY.  The Portfolio may purchase or sell securities on a
       when-issued,  delayed delivery or forward commitment basis.  Although the
       Portfolio would generally purchase  securities in these transactions with
       the intention of acquiring the  securities,  the Portfolio may dispose of
       such  securities  prior to settlement if the investment  management  team
       deems it appropriate to do so.

       SPECIAL RISKS.  Purchasing securities on a when-issued,  delayed delivery
       or forward  commitment  basis  involves the risk that the  securities may
       decrease  in value by the time they are  actually  issued  or  delivered.
       Conversely,  selling securities in these  transactions  involves the risk
       that the value of the  securities  may increase  before the time they are
       actually issued or delivered.  These  transactions  also involve the risk
       that  the  seller  may  fail  to  deliver  the  security  or  cash on the
       settlement date.




<PAGE>


For More Information

ANNUAL/
SEMIANNUAL
REPORT

Additional  information  about the Portfolio's  investments will be available in
the Portfolio's annual and semiannual reports to shareholders.

STATEMENT OF ADDITIONAL INFORMATION

Additional information about the Portfolio and its policies is also available in
the  Portfolio's  Statement  of  Additional  Information  ("SAI").  The  SAI  is
incorporated  by reference into this  Prospectus (is legally  considered part of
this Prospectus).

The Portfolio's  annual and semiannual  reports (when they become available) and
the SAI are available free upon request by calling 1-800-637-1380.

To obtain other information and for shareholder inquiries:

By telephone -- Call 1-800-637-1380

By mail -- Northern Institutional Funds
              P.O. Box 75943
              Chicago, IL 60675

On the Internet -- Text-only versions of the Portfolio's documents are available
on the SEC's website at http://www.sec.gov.

You may review and obtain copies of Trust documents by visiting the SEC's Public
Reference Room in Washington, D.C. You may also obtain copies of Trust documents
by sending your  request and a  duplicating  fee to the SEC's  Public  Reference
Section, Washington, D.C. 20549-6009. Information on the operation of the Public
Reference Room may be obtained by calling the SEC at 1-800-SEC-0330.

Northern
Institutional Funds
SHARES PROSPECTUS

811-3605



<PAGE>


INVESTMENT ADVISER

The Northern Trust Company
50 South LaSalle Street
Chicago, IL 60675

TRANSFER AGENT
AND CUSTODIAN

The Northern Trust Company




<PAGE>


                                                  PART B

                                   STATEMENT OF ADDITIONAL INFORMATION

                                                  SHARES

                                       NORTHERN INSTITUTIONAL FUNDS

                                           MUNICIPAL PORTFOLIO

         This  Statement  of  Additional   Information  dated  October  20  (the
"Additional  Statement")  is not a prospectus.  Copies of the  prospectus  dated
October 20, 1999 for the Shares of the Municipal  Portfolio (the "Portfolio") of
Northern  Institutional  Funds (the "Prospectus") may be obtained without charge
by calling 1-800-637-1380 (toll-free).  The Portfolio also offers two additional
share  classes,  Service  Shares and Premier  Shares,  which are  described in a
separate  statement of additional  information.  Capitalized terms not otherwise
defined have the same meaning as in the Prospectus.



<PAGE>


                                                  INDEX

                                                                            Page

ADDITIONAL INVESTMENT INFORMATION.........................................  3
             Classification and History...................................  3
             Investment Objective, Strategies and Risks...................  3
             Investment Restrictions......................................  12

ADDITIONAL TRUST INFORMATION..............................................  15
             Trustees and Officers........................................  15
             Investment Adviser, Transfer Agent and Custodian.............  18
             Portfolio Transactions.......................................  21
             Co-Administrators and Distributor............................  22
             Counsel and Auditors.........................................  23
             In-Kind Purchases and Redemptions............................  23
             Third-Party Fees and Requirements............................  24

PERFORMANCE INFORMATION...................................................  24

AMORTIZED COST VALUATION..................................................  25

DESCRIPTION OF SHARES.....................................................  26

ADDITIONAL INFORMATION CONCERNING TAXES...................................  30
             General......................................................  30
             Special Tax Considerations...................................  31
             Foreign Investors............................................  32
             Conclusion...................................................  32

OTHER INFORMATION.........................................................  32

APPENDIX A................................................................  A-1

No  person  has  been  authorized  to  give  any  information  or  to  make  any
representations not contained in this Additional  Statement or in the Prospectus
in connection  with the offering of Shares made by the Prospectus  and, if given
or made, such information or  representations  must not be relied upon as having
been  authorized  by the  Trust  or its  distributor.  The  Prospectus  does not
constitute an offering by the Trust or by the distributor in any jurisdiction in
which such offering may not lawfully be made.

An  investment  in the Portfolio is not a deposit of any bank and is not insured
or  guaranteed  by the  Federal  Deposit  Insurance  Corporation  or  any  other
government  agency.  Although the Portfolio  seeks to preserve the value of your
investment at $1.00 per share,  it is possible to lose money by investing in the
Portfolio.


<PAGE>


                                    ADDITIONAL INVESTMENT INFORMATION

Classification and History

         Northern  Institutional Funds (the "Trust") is an open-end,  management
investment  company.  The  Portfolio  is  classified  as  diversified  under the
Investment Company Act of 1940, as amended (the "1940 Act").

         The Portfolio is a series of the Trust,  which was formed as a Delaware
business trust on July 1, 1997 under an Agreement and  Declaration of Trust (the
"Trust  Agreement").   The  Trust  is  the  result  of  a  reorganization  of  a
Massachusetts business trust known as The Benchmark Funds on March 31, 1998. The
Trust's name was changed from The Benchmark Funds to the Northern  Institutional
Funds on July 15,  1998.  The Trust  also  offers six fixed  income,  four money
market, one balanced,  and seven equity  portfolios,  which are not described in
this document.

Investment Objective, Strategies and Risks

         The following  supplements  the  investment  objective,  strategies and
risks of the Portfolio as set forth in the Prospectus. Except as expressly noted
below,  the  investment  objective  and policies of the Portfolio may be changed
without shareholder approval.

Commercial Paper, Bankers' Acceptances, Certificates of Deposit and Time
Deposits

         Commercial  paper  represents  short-term  unsecured  promissory  notes
issued in  bearer  form by banks or bank  holding  companies,  corporations  and
finance companies.  Certificates of deposit are negotiable  certificates  issued
against funds  deposited in a commercial  bank for a definite period of time and
earning a specified return.  Bankers' acceptances are negotiable drafts or bills
of  exchange,  normally  drawn by an importer  or  exporter to pay for  specific
merchandise,  which are "accepted" by a bank,  meaning, in effect, that the bank
unconditionally  agrees to pay the face  value of the  instrument  on  maturity.
Fixed time deposits are bank  obligations  payable at a stated maturity date and
bearing interest at a fixed rate. Fixed time deposits may be withdrawn on demand
by the  investor,  but may be subject to early  withdrawal  penalties  that vary
depending upon market  conditions and the remaining  maturity of the obligation.
There are no  contractual  restrictions  on the right to  transfer a  beneficial
interest  in a fixed time  deposit  to a third  party.  Bank notes and  bankers'
acceptances  rank junior to deposit  liabilities of the bank and pari passu with
other senior,  unsecured  obligations of the bank.  Bank notes are classified as
"other   borrowings"  on  a  bank's  balance  sheet,  while  deposit  notes  and
certificates  of deposit are classified as deposits.  Bank notes are not insured
by the Federal Deposit Insurance Corporation or any other insurer. Deposit notes
are insured by the Federal Deposit  Insurance  Corporation only to the extent of
$100,000 per depositor per bank.

         The Portfolio may invest a portion of its assets in the  obligations of
foreign banks and foreign branches of domestic banks.  Such obligations  include
Eurodollar  Certificates of Deposit  ("ECDs") which are U.S.  dollar-denominated
certificates  of deposit issued by offices of foreign and domestic banks located
outside the United States;  Eurodollar  Time Deposits  ("ETDs"),  which are U.S.
dollar-denominated  deposits  in a foreign  branch  of a U.S.  bank or a foreign
bank;  Canadian Time Deposits  ("CTDs"),  which are essentially the same as ETDs
except they are issued by Canadian offices of major Canadian banks; Schedule Bs,
which are obligations  issued by Canadian branches of foreign or domestic banks;
Yankee Certificates of Deposit ("Yankee CDs") which are U.S.  dollar-denominated
certificates  of deposit  issued by a U.S.  branch of a foreign bank and held in
the United States;  and Yankee Bankers'  Acceptances  ("Yankee BAs"),  which are
U.S. dollar-denominated bankers' acceptances issued by a U.S.
branch of a foreign bank and held in the United States.

Zero Coupon

         To the extent consistent with its investment  objective,  the Portfolio
may invest in zero coupon bonds. Zero coupon bonds are debt securities issued or
sold at a discount  from their face value and which do not entitle the holder to
any  periodic  payment of interest  prior to maturity or a specified  date.  The
original issue discount varies depending on the time remaining until maturity or
cash payment date,  prevailing interest rates, the liquidity of the security and
perceived credit quality of the issuer.  These securities also may take the form
of debt securities that have been stripped of their unmatured  interest coupons,
the coupons  themselves or receipts or  certificates  representing  interests in
such  stripped  debt  obligations  or coupons.  The market prices of zero coupon
bonds  generally are more  volatile  than the market prices of interest  bearing
securities  and are likely to respond to a greater degree of changes in interest
rates than interest  bearing  securities  having  similar  maturities and credit
quality.

         Zero coupon bonds involve the additional risk that,  unlike  securities
that  periodically pay interest to maturity,  the Portfolio will realize no cash
until a specified  future  payment date unless a portion of such  securities  is
sold and, if the issuer of such securities defaults, the Portfolio may obtain no
return at all on its investment.  In addition, even though such securities do no
provide  for  the  payment  of  current  interest  in  cash,  the  Portfolio  is
nonetheless  required to accrue income on such  investment for each taxable year
and generally is required to distribute  such accrued amounts (net of deductible
expenses,  if any) to avoid being  subject to tax.  Because no cash is generally
received at the time of the accrual,  the Portfolio may be required to liquidate
other  portfolio  securities to obtain  sufficient  cash to satisfy  Federal tax
distribution requirements applicable to the Portfolio.

U.S. Government Obligations

         Examples  of the  types  of U.S.  Government  obligations  that  may be
acquired by the  Portfolio  include  U.S.  Treasury  Bills,  Treasury  Notes and
Treasury  Bonds and the  obligations  of Federal  Home Loan Banks,  Federal Farm
Credit Banks,  Federal Land Banks, the Federal Housing  Administration,  Farmers
Home  Administration,  Export-Import  Bank of the United States,  Small Business
Administration,  Federal  National  Mortgage  Association  ("FNMA"),  Government
National Mortgage Association ("GNMA"), General Services Administration, Central
Bank for Cooperatives, Federal Home Loan Mortgage Corporation ("FHLMC"), Federal
Intermediate Credit Banks, and the Maritime Administration.

 .........Securities  guaranteed  as  to  principal  and  interest  by  the  U.S.
Government,  its  agencies or  instrumentalities  are also deemed to include (a)
securities  for which the  payment of  principal  and  interest  is backed by an
irrevocable  letter of credit  issued by the U.S.  Government  or any  agency or
instrumentality  thereof,  and (b)  participations  in  loans  made  to  foreign
governments or their agencies that are so guaranteed.

 .........To the extent consistent with its investment  objective,  the Portfolio
may invest in a variety of U.S. Treasury  obligations and obligations  issued by
or guaranteed by the U.S. Government or its agencies and instrumentalities.  Not
all U.S. Government  obligations carry the same credit support. No assurance can
be  given  that the U.S.  Government  would  provide  financial  support  to its
agencies  or  instrumentalities  if it is  not  obligated  to do so by  law.  In
addition,  the  secondary  market for  certain  participations  in loans made to
foreign governments or their agencies may be limited.

Asset-Backed Securities

         To the extent  described in the Prospectus,  the Portfolio may purchase
asset-backed securities,  which are securities backed by mortgages,  installment
contracts,  credit card  receivables  or other assets.  Asset-backed  securities
represent  interests in "pools" of assets in which payments of both interest and
principal  on the  securities  are made  periodically,  thus in effect  "passing
through"  such  payments  made by the  individual  borrowers  on the assets that
underlie the securities,  net of any fees paid to the issuer or guarantor of the
securities.  The  average  life  of  asset-backed  securities  varies  with  the
maturities  of  the   underlying   instruments,   and  the  average  life  of  a
mortgage-backed  instrument,  in particular,  is likely to be substantially less
than the original  maturity of the mortgage pools underlying the securities as a
result of mortgage  prepayments.  For this and other  reasons,  an  asset-backed
security's stated maturity may be shortened, and the security's total return may
be difficult to predict precisely.

         If an  asset-backed  security is purchased  at a premium,  a prepayment
rate that is  faster  than  expected  will  reduce  yield to  maturity,  while a
prepayment  rate that is slower than expected  will have the opposite  effect of
increasing  yield  to  maturity.  Conversely,  if an  asset-backed  security  is
purchased at a discount,  faster than expected prepayments will increase,  while
slower than expected prepayments will decrease, yield to maturity.

         Prepayments on asset-backed  securities generally increase with falling
interest rates and decrease with rising interest rates; furthermore,  prepayment
rates are  influenced by a variety of economic and social  factors.  In general,
the collateral  supporting  non-mortgage  asset-backed  securities is of shorter
maturity  than  mortgage  loans  and is less  likely to  experience  substantial
prepayments.

         Asset-backed   securities   acquired  by  the   Portfolio  may  include
collateralized  mortgage obligations ("CMOs") issued by private companies.  CMOs
provide  the  holder  with a  specified  interest  in the cash flow of a pool of
underlying  mortgages  or  other  mortgage-backed  securities.  Issuers  of CMOs
ordinarily  elect to be  taxed as  pass-through  entities  known as real  estate
mortgage  investment conduits  ("REMICs").  CMOs are issued in multiple classes,
each with a specified fixed or floating  interest rate and a final  distribution
date.  The relative  payment rights of the various CMO classes may be structured
in a variety of ways. The Portfolio will not purchase  "residual" CMO interests,
which normally exhibit greater price volatility.

         There are a number of  important  differences  among the  agencies  and
instrumentalities of the U.S. Government that issue mortgage-related  securities
and among the securities that they issue. Mortgage-related securities guaranteed
by the GNMA  include  GNMA  Mortgage  Pass-Through  Certificates  (also known as
"Ginnie  Maes"),  which are guaranteed as to the timely payment of principal and
interest  by GNMA and backed by the full faith and credit of the United  States.
GNMA is a  wholly-owned  U.S.  Government  corporation  within the Department of
Housing and Urban  Development.  GNMA  certificates  also are  supported  by the
authority of GNMA to borrow funds from the U.S.  Treasury to make payments under
its guarantee. Mortgage-backed securities issued by FNMA include FNMA Guaranteed
Mortgage  Pass-Through  Certificates  (also known as "Fannie  Maes"),  which are
solely the  obligations  of FNMA and are not backed by or entitled to full faith
and credit of the United States, but are supported by the right of the issuer to
borrow from the  Treasury.  FNMA is a  government-sponsored  organization  owned
entirely  by  private  stockholders.  Fannie  Maes are  guaranteed  as to timely
payment of the  principal  and  interest  by FNMA.  Mortgage-related  securities
issued by the FHLMC  include FHLMC  Mortgage  Participation  Certificates  (also
known as "Freddie Macs" or "Pcs").  FHLMC is a corporate  instrumentality of the
United States,  created pursuant to an Act of Congress,  which is owned entirely
by  Federal  Home  Loan  Banks.  Freddie  Macs  are  not  guaranteed  and do not
constitute a debt or obligation of the United States or of any Federal Home Loan
Bank.  Freddie Macs entitle the holder to timely  payment of interest,  which is
guaranteed  by FHLMC.  FHLMC  guarantees  either  ultimate  collection or timely
payment of all principal  payments on the underlying  mortgage loans. When FHLMC
does not guarantee  timely payment of principal,  FHLMC may remit the amount due
on account of its  guarantee of ultimate  payment of principal at any time after
default on an underlying mortgage,  but in no event later than one year after it
becomes payable.

         Non-mortgage asset-backed securities involve certain risks that are not
presented by mortgage-backed securities. Primarily, these securities do not have
the benefit of the same security interest in the underlying  collateral.  Credit
card  receivables  are  generally  unsecured and the debtors are entitled to the
protection of a number of state and Federal  consumer credit laws, many of which
have  given  debtors  the right to set off  certain  amounts  owed on the credit
cards, thereby reducing the balance due. Most issuers of automobile  receivables
permit the servicers to retain possession of the underlying obligations.  If the
servicer were to sell these  obligations to another party,  there is a risk that
the purchaser  would acquire an interest  superior to that of the holders of the
related  automobile  receivables.  In  addition,  because of the large number of
vehicles involved in a typical issuance and technical  requirements  under state
laws, the trustee for the holders of the automobile  receivables may not have an
effective security interest in all of the obligations  backing such receivables.
Therefore,  there is a possibility that recoveries on repossessed collateral may
not, in some cases, be able to support payments on these securities.

Supranational Bank Obligations

         The  Portfolio  may  invest  in  obligations  of  supranational  banks.
Supranational banks are international banking institutions designed or supported
by national governments to promote economic reconstruction, development or trade
among nations (e.g., the International Bank for Reconstruction and Development).
Obligations of  supranational  banks may be supported by appropriated but unpaid
commitments  of their  member  countries  and there is no  assurance  that these
commitments will be undertaken or met in the future.

Custodial Receipts for Treasury Securities

         The  Portfolio  may  acquire  U.S.  Government  obligations  and  their
unmatured  interest  coupons  that have  been  separated  ("stripped")  by their
holder,  typically  a  custodian  bank  or  investment  brokerage  firm.  Having
separated  the  interest  coupons  from  the  underlying  principal  of the U.S.
Government  obligations,  the holder  will  resell the  stripped  securities  in
custodial receipt programs with a number of different names, including "Treasury
Income  Growth  Receipts"  ("TIGRs")  and  "Certificate  of Accrual on  Treasury
Securities"  ("CATS").  The  stripped  coupons  are  sold  separately  from  the
underlying principal, which is usually sold at a deep discount because the buyer
receives  only the right to receive a future  fixed  payment on the security and
does not receive any rights to periodic interest (cash) payments. The underlying
U.S.  Treasury  bonds and notes  themselves  are held in book-entry  form at the
Federal Reserve Bank or, in the case of bearer  securities  (i.e.,  unregistered
securities  which are  ostensibly  owned by the bearer or  holder),  in trust on
behalf of the owners. Counsel to the underwriters of these certificates or other
evidences of ownership of U.S.  Treasury  securities  have state that,  in their
opinion,  purchasers of the stripped  securities  most likely will be deemed the
beneficial holders of the underlying U.S. Government obligations for Federal tax
purposes.  The  Trust  is  unaware  of  any  binding  legislative,  judicial  or
administrative authority on this issue.

U.S. Treasury STRIPS

         The Treasury Department has facilitated  transfers of ownership of zero
coupon  securities  by accounting  separately  for the  beneficial  ownership of
particular interest coupon and principal payments on Treasury securities through
the Federal  Reserve  book-entry  record-keeping  system.  The  Federal  Reserve
program as  established  by the  Treasury  Department  is known as  "STRIPS"  or
"Separate  Trading of  Registered  Interest and  Principal of  Securities."  The
Portfolio may purchase  securities  registered in the STRIPS program.  Under the
STRIPS program,  the Portfolio will be able to have its beneficial  ownership of
zero coupon securities recorded directly in the book-entry record-keeping system
in lieu of having to hold  certificates  or other  evidences of ownership of the
underlying U.S. Treasury securities.
The Portfolio may acquire securities registered under the STRIPS program.

Variable and Floating Rate Instruments

         With respect to the variable and floating rate  instruments that may be
acquired by the Portfolio as described in the Prospectus, the Investment Adviser
will consider the earning power,  cash flows and other  liquidity  ratios of the
issuers and guarantors of such  instruments  and, if the instruments are subject
to demand  features,  will monitor  their  financial  status and ability to meet
payment on demand.  In  determining  weighted  average  portfolio  maturity,  an
instrument  may,  subject to the Securities and Exchange  Commission (the "SEC")
regulations,  be deemed to have a maturity  shorter  than its  nominal  maturity
based on the period  remaining  until the next interest  rate  adjustment or the
time the  Portfolio  can  recover  payment  of  principal  as  specified  in the
instrument.  Where  necessary  to  ensure  that  a  variable  or  floating  rate
instrument is of the minimum required credit quality, the issuer's obligation to
pay the  principal of the  instrument  will be backed by an  unconditional  bank
letter or line of credit, guarantee or commitment to lend.

Variable and floating  rate  instruments  eligible for purchase by the Portfolio
include  variable  amount  master demand  notes,  which permit the  indebtedness
thereunder  to vary in addition to  providing  for periodic  adjustments  in the
interest  rate.  .........  Variable and floating rate  instruments  held by the
Portfolio will be subject to the Portfolio's  limitation on illiquid investments
when the Portfolio may not demand  payment of the principal  amount within seven
days absent a reliable trading market.

Investment Companies

         With respect to the  investments  of the Portfolio in the securities of
other  investment  companies,  such  investments  will be  limited  so that,  as
determined  after a purchase  is made,  either (a) not more than 3% of the total
outstanding stock of such investment company will be owned by the Portfolio, the
Trust as a whole and their  affiliated  persons  (as defined in the 1940 Act) or
(b) (i) not more than 5% of the value of the total assets of the Portfolio  will
be invested in the securities of any one investment company;  (ii) not more than
10% of the  value of its total  assets  will be  invested  in the  aggregate  in
securities of investment companies as a group; and (iii) not more than 3% of the
outstanding  voting  stock of any one  investment  company  will be owned by the
Portfolio.

         Certain  investment  companies  whose  securities  are purchased by the
Portfolio may not be obligated to redeem such securities in an amount  exceeding
1% of the investment company's total outstanding securities during any period of
less than 30 days.  Therefore,  such  securities  that exceed this amount may be
illiquid.  Notwithstanding  the  foregoing,  the  Portfolio  may  adhere to more
restrictive  limitations with respect to its investments in securities issued by
other  investment  companies  if required by the SEC or deemed to be in the best
interests of  Investment  Adviser.  If required by the 1940 Act,  the  Portfolio
expects to vote the shares of other investment  companies that are held by it in
the same proportion as the vote of all other holders of such securities.

Yields and Ratings

         The  yields  on  certain   obligations,   including  the  money  market
instruments  in which the  Portfolio  invests,  are  dependent  on a variety  of
factors,  including  general economic  conditions,  conditions in the particular
market  for the  obligation,  financial  condition  of the  issuer,  size of the
offering,  maturity of the obligation  and ratings of the issue.  The ratings of
Standard & Poor's Ratings Group, Inc. ("S&P"),  Moody's Investors Service,  Inc.
("Moody's"),  Duff &  Phelps  Credit  Rating  Co.  ("Duff"),  Fitch  IBCA,  Inc.
("Fitch") and Thomson BankWatch,  Inc. represent their respective opinions as to
the quality of the obligations  they undertake to rate.  Ratings,  however,  are
general and are not  absolute  standards of quality.  Consequently,  obligations
with the same  rating,  maturity  and interest  rate may have  different  market
prices.  For a more  complete  discussion  of  ratings,  see  Appendix A to this
Additional Statement.

         Subject to the limitations stated in the Prospectus, if a security held
by the Portfolio undergoes a rating revision, the Portfolio may continue to hold
the security if the Investment Adviser determine such retention is warranted.

Repurchase Agreements

         The Portfolio may agree to purchase portfolio securities from financial
institutions  subject to the seller's  agreement to  repurchase  them a mutually
agreed upon date and price ("repurchase agreements").  Repurchase agreements are
considered to be loans under the 1940 Act. Although the securities  subject to a
repurchase agreement may bear maturities exceeding one year,  settlement for the
repurchase  agreement  will  never be more than one year  after the  Portfolio's
acquisition  of the  securities  and normally will be within a shorter period of
time. Securities subject to repurchase agreements are held either by the Trust's
custodian  or  subcustodian  (if  any),  or  in  the  Federal   Reserve/Treasury
Book-Entry System.  The seller under a repurchase  agreement will be required to
maintain  the value of the  securities  subject  to the  agreement  in an amount
exceeding the repurchase  price  (including  accrued  interest).  Default by the
seller would, however,  expose the Portfolio to possible loss because of adverse
market  action or delay in connection  with the  disposition  of the  underlying
obligations.

Reverse Repurchase Agreements

         The  Portfolio  may borrow  funds by selling  portfolio  securities  to
financial  institutions  such  as  banks  and  broker/dealers  and  agreeing  to
repurchase  them at a mutually  specified  date and price  ("reverse  repurchase
agreements").   The  Portfolio  may  use  the  proceeds  of  reverse  repurchase
agreements to purchase other securities  either maturing,  or under an agreement
to resell, at a date simultaneous with or prior to the expiration of the reverse
repurchase  agreement.  Reverse  repurchase  agreements  are  considered  to  be
borrowing under the 1940 Act.  Reverse  repurchase  agreements  involve the risk
that the market value of the securities  sold by the Portfolio may decline below
the  repurchase  price.  The  Portfolio  will pay  interest on amounts  obtained
pursuant to a reverse repurchase agreement.  While reverse repurchase agreements
are  outstanding,  the Portfolio  will  segregate  liquid assets in an amount at
least  equal to the  market  value of the  securities,  plus  accrued  interest,
subject to the agreement.

Securities Lending

         Collateral for loans of portfolio  securities made by the Portfolio may
consist of cash, cash  equivalents,  securities issued or guaranteed by the U.S.
Government  or its  agencies  or  irrevocable  bank  letters  of credit  (or any
combination  thereof).  The borrower of securities  will be required to maintain
the market  value of the  collateral  at not less than the  market  value of the
loaned  securities,  and such value will be monitored on a daily basis. When the
Portfolio lends its securities,  it continues to receive  dividends and interest
on the securities loaned and may simultaneously  earn interest on the investment
of the cash collateral.  Although voting rights, or rights to consent, attendant
to securities  on loan pass to the  borrower,  such loans will be called so that
the securities  may be voted by the Portfolio if a material event  affecting the
investment is to occur.

Forward Commitments, When-Issued Securities and Delayed-Delivery Transactions

         The  Portfolio  may  purchase  securities  on a  when-issued  basis  or
purchase or sell securities on a forward  commitment  (sometimes  called delayed
delivery)  basis.  These  transactions  involve a commitment by the Portfolio to
purchase  or sell  securities  at a future  date.  The  price of the  underlying
securities  (usually  expressed  in  terms  of  yield)  and the  date  when  the
securities will be delivered and paid for (the settlement date) are fixed at the
time the transaction is negotiated. When-issued purchases and forward commitment
transactions are normally negotiated directly with the other party.

         The  Portfolio  will  purchase  securities  on a  when-issued  basis or
purchase  or sell  securities  on a  forward  commitment  basis  only  with  the
intention of completing the transaction  and actually  purchasing or selling the
securities. If deemed advisable as a matter of investment strategy, however, the
Portfolio may dispose of or negotiate a commitment  after  entering into it. The
Portfolio  also may sell  securities it has  committed to purchase  before those
securities are delivered to the Portfolio on the settlement  date. The Portfolio
may realize a capital gain or loss in connection with these transactions.

         When the Portfolio  purchases  securities  on a when-issued  or forward
commitment  basis,  the Portfolio  will  segregate  liquid assets having a value
(determined  daily) at least  equal to the  amount of the  Portfolio's  purchase
commitments  until three days prior to the settlement  date, or otherwise  cover
its position.  These  procedures  are designed to ensure that the Portfolio will
maintain  sufficient  assets  at  all  times  to  cover  its  obligations  under
when-issued  purchases,  forward commitments and delayed-delivery  transactions.
For purposes of determining the Portfolio's  average  dollar-weighted  maturity,
the maturity of when-issued or forward commitment  securities will be calculated
from the commitment date.

Municipal Instruments

         Opinions  relating to the  validity  of  municipal  instruments  and to
Federal  and state tax issues  relating  to these  securities  are  rendered  by
counsel to the  respective  issuing  authorities  at the time of issuance.  Such
opinions may contain various assumptions,  qualifications or exceptions that are
reasonably  acceptable to Investment  Adviser.  Neither Trust nor the Investment
Adviser  will  review the  proceedings  relating to the  issuance  of  municipal
instruments or the bases for such opinions.

         Municipal instruments include both "general" and "revenue" obligations.
General obligations are secured by the issuer's pledge of its full faith, credit
and taxing power for the payment of principal and interest.  Revenue obligations
are payable only from the revenues  derived from a particular  facility or class
of facilities  or, in some cases,  from the proceeds of a special  excise tax or
other specific  revenue  source such as lease revenue  payments from the user of
the facility  being  financed.  Industrial  development  bonds are in most cases
revenue  securities  and are not payable from the  unrestricted  revenues of the
issuer.  Consequently,  the credit  quality  of an  industrial  revenue  bond is
usually  directly  related to the credit  standing  of the  private  user of the
facility involved.

         The Portfolio may also invest in "moral  obligation"  bonds,  which are
normally issued by special purpose public authorities.  If the issuer of a moral
obligation  bond is unable to meet its debt  service  obligations  from  current
revenues,  it may draw on a reserve fund (if such a fund has been  established),
the restoration of which is a moral commitment but not a legal obligation of the
state or municipality which created the issuer.

         Within the principal classifications of municipal instruments described
above there are a variety of categories,  including  municipal bonds,  municipal
notes,  municipal leases,  custodial  receipts and  participation  certificates.
Municipal  notes  include  tax,  revenue  and bond  anticipation  notes of short
maturity,  generally less than three years, which are issued to obtain temporary
funds  for  various  public  purposes.   Municipal   leases  and   participation
certificates  are  obligations   issued  by  state  and  local   governments  or
authorities   to  finance  the   acquisition   of  equipment   and   facilities.
Participation   certificates   may  represent   participation  in  a  lease,  an
installment  purchase  contract,  or  a  conditional  sales  contract.   Certain
municipal lease obligations (and related participation certificates) may include
"non-appropriation"   clauses  which  provide  that  the   municipality  has  no
obligation  to make lease or  installment  purchase  payments  in futures  years
unless  money is  appropriated  for such  purpose on a yearly  basis.  Custodial
receipts are underwritten by securities  dealers or banks and evidence ownership
of future interest  payments,  principal  payments or both on certain  municipal
securities.  Municipal  leases (and  participations  in such leases) present the
risk that a municipality will not appropriate funds for the lease payments.  The
Investment Adviser, under the supervision of the Trust's Board of Trustees, will
determine  the credit  quality  of any  unrated  municipal  leases on an ongoing
basis,  including an  assessment of the  likelihood  that the leases will not be
cancelled.

         An issuer's obligations under its municipal  instruments are subject to
the provisions of bankruptcy, insolvency and other laws affecting the rights and
remedies of creditors,  such as the Federal  Bankruptcy  Code, and laws, if any,
which may be enacted by Federal  or state  legislatures  extending  the time for
payment of principal or interest,  or both, or imposing other  constraints  upon
enforcement of such  obligations or upon the ability of  municipalities  to levy
taxes. The power or ability of an issuer to meet its obligations for the payment
of interest on and  principal of its  municipal  instruments  may be  materially
adversely affected by litigation or other conditions.

         From time to time proposals have been  introduced  before  Congress for
the purpose of restricting  or eliminating  the Federal income tax exemption for
interest on municipal instruments. For example, under the Tax Reform Act of 1986
interest on certain  private  activity  bonds must be included in an  investor's
Federal alternative minimum taxable income, and corporate investors must include
all tax-exempt interest in their Federal alternative minimum taxable income. The
Trust cannot predict what legislation,  if any, may be proposed in the future in
Congress  as regards the  Federal  income tax status of  interest  on  municipal
instruments or which  proposals,  if any, might be enacted.  Such proposals,  if
enacted,  might  materially and adversely  affect the  availability of municipal
instruments for investment by the Portfolio and its liquidity and value. In such
an event the Board of  Trustees  would  reevaluate  the  Portfolio's  investment
objective  and  policies  and  consider  changes in their  structure or possible
dissolution.

         Certain  of the  municipal  instruments  held by the  Portfolio  may be
insured as to the timely  payment  of  principal  and  interest.  The  insurance
policies will usually be obtained by the issuer of the  Municipal  Instrument at
the time of its original  issuance.  In the event that the issuer defaults on an
interest or principal payment, the insurer will be notified and will be required
to make payment to the  bondholders.  There is,  however,  no guarantee that the
insurer will meet its obligations.  In addition, such insurance will not protect
against  market  fluctuations  caused by  changes  in  interest  rates and other
factors. The Portfolio may invest more than 25% of its total assets in municipal
instruments covered by insurance policies.

         As described in the  Prospectus,  the Portfolio may invest in municipal
leases,  which may be  considered  liquid under  guidelines  established  by the
Trust's Board of Trustees.  The guidelines will provide for determination of the
liquidity  of a  municipal  lease  obligation  based on  factors  including  the
following:  (1) the frequency of trades and quotes for the  obligation;  (2) the
number of dealers  willing to  purchase or sell the  security  and the number of
other  potential  buyers;  (3) the willingness of dealers to undertake to make a
market in the security; and (4) the nature of the marketplace trades,  including
the time needed to dispose of the security,  the method of soliciting offers and
the mechanics of transfer.  The Investment Adviser, under the supervision of the
Trust's Board of Trustees,  will also consider the continued  marketability of a
municipal lease  obligation based upon an analysis of the general credit quality
of  the  municipality  issuing  the  obligation  and  the  essentiality  to  the
municipality of the property covered by the lease.

 .........Currently, it is not the intention of the Portfolio to invest more than
25% of the value of its total assets in municipal  instruments whose issuers are
in the same state.

Standby Commitments

         The  Portfolio  may enter  into  standby  commitments  with  respect to
municipal instruments held by it. Under a standby commitment, a dealer agrees to
purchase at the Portfolio's  option a specified  Municipal  Instrument.  Standby
commitments  may be exercisable by the Portfolio at any time before the maturity
of the underlying municipal instruments and may be sold, transferred or assigned
only with the instruments involved.

         The  Portfolio  expects  that  standby  commitments  will  generally be
available without the payment of any direct or indirect consideration.  However,
if necessary or advisable, the Portfolio may pay for a standby commitment either
separately in cash or by paying a higher price for municipal  instruments  which
are  acquired  subject to the  commitment  (thus  reducing the yield to maturity
otherwise  available for the same  securities).  The total amount paid in either
manner for outstanding standby commitments held by the Portfolio will not exceed
1/2 of 1% of the value of the Portfolio's  total assets  calculated  immediately
after each standby commitment is acquired.

         The  Portfolio  intends to enter  into  standby  commitments  only with
dealers,  banks and  broker-dealers  which,  in  Investment  Adviser's  opinion,
present  minimal credit risks.  The Portfolio will acquire  standby  commitments
solely to facilitate  portfolio  liquidity  and do not intend to exercise  their
rights thereunder for trading purposes.  The acquisition of a standby commitment
will not affect the valuation of the underlying Municipal Instrument. The actual
standby  commitment  will be valued  at zero in  determining  net  asset  value.
Accordingly,  where the  Portfolio  pays  directly or  indirectly  for a standby
commitment,  its cost will be  reflected  as an  unrealized  loss for the period
during which the  commitment  is held by the  Portfolio and will be reflected in
realized gain or loss when the commitment is exercised or expires.

Illiquid or Restricted Securities

         The Portfolio may invest up to 10% of its net assets in securities that
are illiquid.  Commercial  paper issued pursuant to Section 4(2) of the 1933 Act
and  securities  that are not  registered  under the 1933 Act but can be sold to
"qualified institutional buyers" in accordance with Rule 144A under the 1933 Act
will not be considered  illiquid so long as the Investment  Adviser  determines,
under  guidelines  approved by the Trust's  Board of Trustees,  that an adequate
trading  market  exists.  This practice  could increase the level of illiquidity
during any period that qualified  institutional  buyers become  uninterested  in
purchasing these securities.

Investment Restrictions

         The  Portfolio is subject to the  fundamental  investment  restrictions
enumerated  below  which  may be  changed  only  by a vote of the  holders  of a
majority of the Portfolio's outstanding shares.

The Portfolio may not:

           (1) Make loans,  except (a) through the purchase of debt  obligations
           in accordance with the Portfolio's investment objective and policies,
           (b) through repurchase  agreements with banks,  brokers,  dealers and
           other financial institutions, and (c) loans of securities.

       (2) Mortgage,  pledge or  hypothecate  any assets (other than pursuant to
       reverse repurchase agreements) except to secure permitted borrowings.

       (3)  Purchase  or sell real  estate or  securities  issued by real estate
       investment  trusts,  but this restriction shall not prevent the Portfolio
       from investing directly or indirectly in portfolio instruments secured by
       real estate or interests therein.

       (4) Purchase or sell commodities or commodity  contracts or oil or gas or
       other mineral exploration or development programs.

       (5)  Invest  in  companies  for the  purpose  of  exercising  control  or
management.

       (6) Act as  underwriter  of  securities  (except as the  Portfolio may be
       deemed  to  be an  underwriter  under  the  Securities  Act  of  1933  in
       connection  with  the  purchase  and  sale of  portfolio  instruments  in
       accordance  with  its  investment   objective  and  portfolio  management
       policies),  purchase securities on margin (except for delayed delivery or
       when-issued  transactions or such short-term credits as are necessary for
       the  clearance  of  transactions),  make  short  sales of  securities  or
       maintain a short position, or write puts, calls or combinations thereof.

       (7) Make any investment inconsistent with the Portfolio's  classification
       as a diversified investment company under the 1940 Act.

       (8) Purchase securities if such purchase would cause more than 25% in the
       aggregate of the market value of the total assets of the  Portfolio to be
       invested in the securities of one or more issuers having their  principal
       business  activities  in the same  industry,  provided  that  there is no
       limitation with respect to, and the Portfolio reserves freedom of action,
       when otherwise  consistent with its investment  policies,  to concentrate
       its  investments  in  obligations   issued  or  guaranteed  by  the  U.S.
       Government,  its agencies or  instrumentalities,  obligations (other than
       commercial paper) issued or guaranteed by U.S. banks and U.S. branches of
       foreign   banks  and   repurchase   agreements   and   securities   loans
       collateralized  by  such  U.S.   Government   obligations  or  such  bank
       obligations.  For the purposes of this  restriction,  state and municipal
       governments  and their  agencies  and  authorities  are not  deemed to be
       industries;  as to  utility  companies,  the  gas,  electric,  water  and
       telephone businesses are considered separate industries;  personal credit
       finance  companies and business credit finance companies are deemed to be
       separate industries; and wholly-owned finance companies are considered to
       be in the  industries of their parents if their  activities are primarily
       related to financing the activities of their parents.

       (9) Borrow money (other than  pursuant to reverse  repurchase  agreements
       for the Portfolio  described above),  except (a) as a temporary  measure,
       and then only in amounts not exceeding 5% of the value of the Portfolio's
       total assets or (b) from banks,  provided that immediately after any such
       borrowing all borrowings of the Portfolio do not exceed  one-third of the
       Portfolio's  total  assets.  No purchases of  securities  will be made if
       borrowings  subject  to this  restriction  exceed  5% of the value of the
       Portfolio's assets. The exceptions in (a) and (b) to this restriction are
       not for investment  leverage purposes but are solely for extraordinary or
       emergency  purposes or to facilitate  management of the Trust's Portfolio
       by enabling the Trust to meet redemption requests when the liquidation of
       portfolio instruments is deemed to be disadvantageous or not possible. If
       due to market  fluctuations  or other  reasons  the  total  assets of the
       Portfolio  fall below  300% of its  borrowings,  the Trust will  promptly
       reduce the borrowings of such Portfolio in accordance with the 1940 Act.

       (10)  Notwithstanding  any of the Trust's  other  fundamental  investment
       restrictions (including,  without limitation, those restrictions relating
       to issuer  diversification,  industry  concentration  and  control),  the
       Portfolio may (a) purchase  securities of other  investment  companies to
       the  full  extent  permitted  under  Section  12 of the  1940 Act (or any
       successor  provision  thereto)  or under any  regulation  or order of the
       Securities and Exchange  Commission;  and (b) invest all or substantially
       all of its  assets  in a single  open-end  investment  company  or series
       thereof with  substantially the same investment  objective,  policies and
       fundamental restrictions as the Portfolio.

                                         *     *     *

         The freedom of action  reserved in  Restriction  No. 8 with  respect to
U.S.  branches  of foreign  banks is subject  to the  requirement  that they are
subject to the same regulation as domestic  branches of U.S. banks.  Obligations
of U.S. branches of foreign banks may include certificates of deposit,  bank and
deposit notes,  bankers' acceptances and fixed time deposits.  These obligations
may be general  obligations  of the parent bank or may be limited to the issuing
branch.  Such  obligations  will meet the criteria for "Eligible  Securities" as
described in the Prospectus.

         In addition,  as a matter of fundamental  policy, the Portfolio may not
enter into reverse repurchase agreements exceeding in the aggregate one-third of
its total assets.

         Also,  as a matter  of  fundamental  policy,  changeable  only with the
approval  of  the  holders  of a  majority  of  the  outstanding  shares  of the
Portfolio,  at least 80% of the annual  gross  income of the  Portfolio  will be
derived from debt instruments,  the interest on which is, in the opinion of bond
counsel or counsel for issuers,  exempt from regular  Federal income tax, except
in extraordinary circumstances such as when the Investment Adviser believes that
market conditions indicate that the Portfolio should adopt a temporary defensive
posture by holding uninvested cash or investing in taxable securities.  Interest
earned by the Portfolio on "private  activity  bonds" that is treated as an item
of tax preference under the Federal alternative minimum tax will be deemed to be
exempt from regular  Federal income tax for purposes of determining  whether the
Portfolio meets this fundamental policy.

         Securities  held in escrow or separate  accounts in connection with the
Portfolio's  investment  practices described in this Additional Statement and in
the  Prospectus  are not deemed to be  mortgaged,  pledged or  hypothecated  for
purposes of the foregoing Investment Restrictions.

         Except to the extent otherwise  provided in Investment  Restriction No.
8, for the purpose of such  restriction in determining  industry  classification
the Trust  intends to use the industry  classification  titles in the  Bloomberg
Industry Group Classifications.

         In applying  Restriction  No. 8 above,  a security is  considered to be
issued by the entity, or entities,  whose assets and revenues back the security.
A guarantee of a security is not deemed to be a security issued by the guarantor
when the value of all securities  issued and  guaranteed by the  guarantor,  and
owned by the  Portfolio,  does not  exceed  10% of the value of the  Portfolio's
total assets.

         Any  restriction  which  involves  a  maximum  percentage  will  not be
considered  violated  unless an excess over the  percentage  occurs  immediately
after,  and is caused by, an  acquisition or encumbrance of securities or assets
of, or borrowings by, the Portfolio.

         The Portfolio  intends,  as a non-fundamental  policy, to diversify its
investments  in  accordance  with current SEC  regulations.  Investments  in the
securities of any single issuer (excluding cash, cash items,  certain repurchase
agreements,  U.S.  Government  securities  and  securities  of other  investment
companies)  will be limited to not more than 5% of the value of the  Portfolio's
total assets at the time of purchase,  except that 25% of the value of the total
assets of the Portfolio may be invested in the  securities of any one issuer for
a period of up to three  Business  Days.  A security  that has an  unconditional
guarantee  meeting special SEC  requirements  (a  "Guarantee")  does not need to
satisfy the foregoing issuer  diversification  requirements that would otherwise
apply,  but the Guarantee is instead  subject to the  following  diversification
requirements:  immediately after the acquisition of the security,  the Portfolio
may not have invested more than 10% of its total assets in securities  issued by
or subject to Guarantees  from the same person,  except that the Portfolio  may,
subject  to  certain  conditions,  invest  up to  25%  of its  total  assets  in
securities  issued or subject to Guarantees of the same person.  This percentage
is 100% if the Guarantee is issued by the U.S.  Government or an agency thereof.
In  addition,  the  Portfolio  will limit its  investments  in  certain  conduit
securities  that are not rated in the  highest  short-term  rating  category  as
determined by two nationally  recognized  statistical rating organizations (each
an  "NRSRO")  (or one NRSRO if the  security  is rated by only one NRSRO) or, if
unrated,  are not of comparable  quality to First Tier Securities  ("Second Tier
Securities"), to 5% of its total assets, with investments in any one such issuer
being limited to no more than 1% of the Portfolio's  total assets or $1 million,
whichever  is greater,  measured  at the time of  purchase.  Conduit  securities
subject to this limitation are municipal  instruments  that are not subject to a
Guarantee and involve an arrangement whereunder a person, other than a municipal
issuer, provides for or secures repayment of the security and are not: (i) fully
and  unconditionally  guaranteed by a municipal issuer; or (ii) payable from the
general  revenues of the municipal issuer or other municipal  issuers;  or (iii)
related to a project owned and operated by a municipal  issuer;  or (iv) related
to a facility  leased to and under the control of an  industrial  or  commercial
enterprise  that is part of a public  project  which,  as a whole,  is owned and
under the control of a municipal issuer.

         In addition to the  foregoing,  the  Portfolio is subject to additional
diversification  requirements  imposed by SEC  regulations on the acquisition of
securities subject to other types of demand features.

                                       ADDITIONAL TRUST INFORMATION

TRUSTEES AND OFFICERS

         The  business  and affairs of the Trust and the  Portfolio  are managed
under the direction of the Trust's Board of Trustees.  Information pertaining to
the Trustees and officers of the Trust is set forth below.
<TABLE>
<CAPTION>
<S><C>                           <C>       <C>                   <C>
NAME                                       POSITION(S)           PRINCIPAL OCCUPATION(S)
AND ADDRESS                      AGE       WITH TRUST            DURING PAST 5 YEARS
- -----------                      ---       ----------            -------------------

William H. Springer              69        Chairman              Director of Walgreen Co. (a retail drug
701 Morningside Drive                      and                   store   business)   since   April   1988;
Director
Lake Forest, IL 60045                      Trustee               of Baker, Fentress & Co. (a closed-end,
                                                                 non-diversified management investment
                                                                 company)  from  April  1992  to  present;
Trustee
                                                                 of  Goldman  Sachs  Trust  (a  registered
                                                                 investment    company)   from   1989   to
                                                                 present.

Richard Gordon Cline             64        Trustee               Chairman and Director of Hussman
4200 Commerce Court,                                             International      Inc.       (commercial
refrigeration
Suite 300                                                        company) since January 1998; Chairman of
Lisle, IL 60532                                                  Hawthorne Inc. (a management advisory
                                                                 services and private investment company)
                                                                 since January 1996;  Chairman,  President
and
                                                                 CEO of NICOR Inc. (a diversified public
                                                                 utility  holding  company)  from  1985 to
1996;
                                                                 Chairman  and  Director  of  the  Federal
Reserve
                                                                 Bank of Chicago from 1992 to 1995;
Director
                                                                 of      Central
                                                                 DuPage   Health
                                                                 System,     Pet
                                                                 Incorporated (a
                                                                 commercial food
                                                                 company),
                                                                 Whitman
                                                                 Corporation  (a
                                                                 diversified
                                                                 holding
                                                                 company), Kmart
                                                                 Corporation  (a
                                                                 retailing
                                                                 company),
                                                                 Ryerson   Tull,
                                                                 Inc.  (a metals
                                                                 distribution
                                                                 company)    and
                                                                 University   of
                                                                 Illinois
                                                                 Foundation.

Edward J. Condon, Jr.            58        Trustee               Chairman and CEO of The  Paradigm  Group,
Ltd.
Sears Tower, Suite 9650                                          (a  financial  adviser)  since July 1993;
within the
233 S. Wacker Drive.                                             last  five  years he has  served  as Vice
                                                                 Chairman and
Chicago, IL 60606                                                Director of Energenics L.L.C. (a waste
                                                                 recycling company); Director of
                                                                 Financial Pacific Company (an equipment
                                                                 leasing company); Member of the Board of
                                                                 Managers of The Liberty Hampshire
                                                                 Company, LLC (a receivable
                                                                 securitization company), Member of
                                                                 Advisory Board of Real-Time U.S.A., Inc.
                                                                 (a software company); Member of the
                                                                 Board of Directors of University Elder
                                                                 Care, Inc.; Member of the Board of
                                                                 Directors of the Girl Scouts of Chicago;
                                                                 Member of the Board of Trustees of
                                                                 Dominican University.


<PAGE>


NAME                                       POSITION(S)           PRINCIPAL OCCUPATION(S)
AND ADDRESS                      AGE       WITH TRUST            DURING PAST 5 YEARS
- -----------                      ---       ----------            -------------------


John W. English                  66        Trustee               Private   Investor   since   1993;   Vice
President
50-H New England Ave.                                            and Chief Investment Officer of The Ford
P.O. Box 640                                                     Foundation (a charitable trust) from
1981 until
Summit, NJ 07902-0640                                            1993; Trustee of The China Fund, Inc. (a
                                                                 registered
                                                                 investment
                                                                 company),
                                                                 American    Red
                                                                 Cross        in
                                                                 Greater     New
                                                                 York,      Mote
                                                                 Marine
                                                                 Laboratory   (a
                                                                 non-profit
                                                                 marine research
                                                                 facility),
                                                                 State  Street's
                                                                 Select   Sector
                                                                 SPDR  Trust  (a
                                                                 registered
                                                                 investment
                                                                 company),
                                                                 Washington
                                                                 Mutual's     WM
                                                                 Funds        (a
                                                                 registered
                                                                 investment
                                                                 company)    and
                                                                 United    Board
                                                                 for   Christian
                                                                 Higher
                                                                 Education    in
                                                                 Asia.  Director
                                                                 of   University
                                                                 of         Iowa
                                                                 Foundation,
                                                                 Blanton-Peale
                                                                 Institutes   of
                                                                 Religion    and
                                                                 Health,
                                                                 Community
                                                                 Foundation   of
                                                                 Sarasota
                                                                 County,     and
                                                                 Duke Management
                                                                 Company     (an
                                                                 investment
                                                                 adviser).

Sandra Polk Guthman              55        Trustee               President and CEO of Polk Bros.
Foundation
420 N. Wabash Avenue                                             (an Illinois not-for-profit corporation)
Suite 204                                                        from  1993  to   present;   Director   of
Business
Chicago, IL 60611                                                Transformation    from    1992-1993   and
Midwestern
                                                                 Director     of
                                                                 Marketing  from
                                                                 1988-1992   for
                                                                 IBM          (a
                                                                 technology
                                                                 company);
                                                                 Director     of
                                                                 MBIA  Insurance
                                                                 Corporation  of
                                                                 Illinois  (bank
                                                                 holding
                                                                 company)  since
                                                                 1994        and
                                                                 Avondale
                                                                 Financial
                                                                 Corporation  (a
                                                                 stock   savings
                                                                 and        loan
                                                                 holding
                                                                 company)  since
                                                                 1995.

Frederick T. Kelsey             71         Trustee               Consultant    to   Goldman    Sachs   (an
investment
3133 Laughing Gull Court                                         advisor)   from   December  1985  through
February Johns Island, SC 29455                                  1988;  Director  of Goldman  Sachs  Funds
Group
                                                                 (a    financial
                                                                 services
                                                                 provider)   and
                                                                 Vice  President
                                                                 of      Goldman
                                                                 Sachs  from May
                                                                 1981  until his
                                                                 retirement   in
                                                                 November  1985;
                                                                 President   and
                                                                 Treasurer    of
                                                                 the  Trust  and
                                                                 other
                                                                 investment
                                                                 companies
                                                                 affiliated with
                                                                 Goldman   Sachs
                                                                 through  August
                                                                 1985; President
                                                                 from   1983  to
                                                                 1985        and
                                                                 Trustee    from
                                                                 1983 to 1994 of
                                                                 The  Centerland
                                                                 Funds  and  its
                                                                 successor,  The
                                                                 Pilot  Funds (a
                                                                 registered
                                                                 investment
                                                                 company);
                                                                 Trustee      of
                                                                 various
                                                                 management
                                                                 investment
                                                                 companies
                                                                 affiliated with
                                                                 Zurich   Kemper
                                                                 Investments (an
                                                                 investment
                                                                 adviser).

Richard P. Strubel               59        Trustee               Managing  Director  of  Tandem  Partners,
Inc.
737 N. Michigan Avenue                                           (a privately held management services
firm)
Suite 1405                                                       since   1990;   President   and   CEO  of
Microdot,
Chicago, IL 60611                                                Inc.  (a  privately  held   manufacturing
firm)
                                                                 from  January   1984  to  October   1994;
Trustee
                                                                 of  Goldman  Sachs  Trust  (a  registered
                                                                 investment    company)   from   1987   to
                                                                 present;      Director      of     Kaynar
                                                                 Technologies      Inc.     (a     leading
                                                                 manufacturer of aircraft fasteners)
                                                                 since   March   1997;   Trustee   of  the
                                                                 University   of   Chicago;   Director  of
                                                                 Children's Memorial Medical Center.

Jylanne M. Dunne                 39        President             Senior Vice President for Distribution
4400 Computer Drive                                              Services at First Data Investor Services
Westborough, MA 01581                                            Group, Inc. ("FDISG") (since 1988).

Richard H. Rose                  43        Vice                  Vice President and Division Manager of
4400 Computer Drive                        President             Mutual  Fund   Administration   at  FDISG
(since
Westborough, MA 01581                                            1994);   Senior  Vice  President  at  The
Boston
                                                                 Company   Advisors,   Inc.  (a  financial
                                                                 services  provider) (prior thereto).


<PAGE>


NAME                                       POSITION(S)           PRINCIPAL OCCUPATION(S)
AND ADDRESS                      AGE       WITH TRUST            DURING PAST 5 YEARS
- -----------                      ---       ----------            -------------------


Brian R. Curran                  31        Treasurer             Director of Fund Administration and
4400 Computer Drive                                              Accounting   at   FDISG   (since   1997);
Director
Westborough, MA 01581                                            of Fund Administration at State Street
Bank and
                                                                 Trust   Company
                                                                 (February  1997
                                                                 to      October
                                                                 1997);   Senior
                                                                 Auditor      at
                                                                 Price
                                                                 Waterhouse
                                                                 L.L.P.
                                                                 (February  1994
                                                                 to     February
                                                                 1997);  Manager
                                                                 of         Fund
                                                                 Accounting   at
                                                                 State    Street
                                                                 Bank and  Trust
                                                                 Company  (prior
                                                                 thereto).

Linda J. Hoard                   51        Secretary             Counsel at FDISG (since 1998); Attorney
4400 Computer Drive                                              Consultant for Fidelity Investments (an
Westborough,  MA 01581                                           investment adviser),  Investors  Bank & Trust
                                                                 Company  (a   financial   service   provider)   and  FDISG
                                                                 (September   1994  to  June  1998);   Vice  President  and
                                                                  Assistant General Counsel at MFS Investment Management (an
                                                                  investment adviser) (prior thereto).

Teresa M.R. Hamlin               34        Assistant             Counsel at FDISG (since 1994); Paralegal
4400 Computer Drive                        Secretary             Manager at The Boston  Company  Advisors, Inc.
Westborough, MA 01581                                            (an investment adviser) (prior thereto).

Therese Hogan                    36        Assistant             Director   of   the   State    Regulation
4400 Computer Drive                        Secretary             at FDISG (since 1994); Senior Legal
Westborough, MA 01581                                            Assistant at Palmer and Dodge (a
                                                                 Massachusetts law firm) (prior thereto).
</TABLE>

         None of the  Trustees  is an  "interested  person"  under the 1940 Act.
Certain of the Trustees and officers and the  organizations  with which they are
associated have had in the past, and may have in the future,  transactions  with
Northern,  FDISG,  First Data  Distributors,  Inc. ("FDDI" and collectively with
FDISG, "First Data") and their respective affiliates. The Trust has been advised
by such  Trustees  and  officers  that all such  transactions  have been and are
expected  to be in the  ordinary  course  of  business  and  the  terms  of such
transactions,  including all loans and loan  commitments  by such persons,  have
been and are expected to be  substantially  the same as the prevailing terms for
comparable transactions for other customers. As a result of the responsibilities
assumed by Northern under its Advisory  Agreement,  Transfer  Agency  Agreement,
Custodian  Agreement and  Co-Administration  Agreement with the Trust,  by FDISG
under its  Co-Administration  Agreement  with the  Trust  and by FDDI  under its
Distribution Agreement with the Trust, the Trust itself requires no employees.

         Each officer holds  comparable  positions with certain other investment
companies of which First Data or an affiliate thereof is the investment adviser,
administrator and/or distributor.

         Each Trustee  earns a quarterly  retainer of $6,750 and the Chairman of
the Board earns a quarterly  retainer of $10,125.  Each  Trustee,  including the
Chairman  of the  Board,  earns an  additional  fee of $2,500  for each  meeting
attended, plus reimbursement of expenses incurred as a Trustee.

         In addition,  the Trustees established an Audit Committee consisting of
three members including a Chairman of the Committee. The Audit Committee members
are Messrs.  Condon,  Kelsey and Strubel (Chairman).  Each member earns a fee of
$2,500 for each meeting attended and the Chairman earns a quarterly  retainer of
$1,500.

         Each Trustee will hold office for an indefinite term until the earliest
of (1) the next  meeting of  shareholders,  if any,  called  for the  purpose of
considering  the election or  re-election of such Trustee and until the election
and qualification of his or her successor,  if any, elected at such meeting; (2)
the date a Trustee  resigns or retires,  or a Trustee is removed by the Board of
Trustees  or  shareholders,   in  accordance  with  the  Trust's  Agreement  and
Declaration of Trust, or (3) in accordance  with the current  resolutions of the
Board of Trustees (which may be changed without  shareholder  vote), on the last
day of the  fiscal  year of the Trust in which he or she  attains  the age of 72
years.

         The Trust's officers do not receive fees from the Trust for services in
such capacities,  although FDISG, of which they are also officers, receives fees
from the Trust for administrative services.

         The following table sets forth certain  information with respect to the
compensation of each Trustee of the Trust for the one-year period ended November
30, 1998:
<TABLE>
<CAPTION>
<S><C>                        <C>                   <C>                             <C>

                              Aggregate             Pension or Retirement           Total Compensation From
                              Compensation          Benefits Accrued as a Part of   Trust Paid
Name of Trustee               from the Trust        Trust's Expenses                to Trustees

William H. Springer           $46,750               N/A                             $46,750
Richard G. Cline              $34,000               N/A                             $34,000
Edward J. Condon, Jr.         $37,000               N/A                             $37,000
John W. English               $32,500               N/A                             $32,500
Sandra Polk Guthman           $34,000               N/A                             $34,000
Frederick T. Kelsey           $37,000               N/A                             $37,000
Richard P. Strubel            $42,250               N/A                             $42,250
</TABLE>

Investment Adviser, Transfer Agent and Custodian

         Northern,  a wholly-owned  subsidiary of Northern Trust Corporation,  a
bank  holding  company,  is one of the nation's  leading  providers of trust and
investment  management  services.  As of September  30,  1999,  Northern and its
affiliates  had over  $262.8  billion in assets  under  management  for  clients
including public and private retirement funds, endowments,  foundations, trusts,
corporations,  and  individuals.  Northern  is  one  of  the  strongest  banking
organizations  in  the  United  States.  Northern  believes  it  has  built  its
organization  by serving  clients with  integrity,  a commitment  to quality and
personal  attention.  Its  stated  mission  with  respect  to all its  financial
products and services is to achieve unrivaled client satisfaction.  With respect
to such clients,  the Trust is designed to assist (i) defined  contribution plan
sponsors and their employees by offering a range of diverse  investment  options
to help comply with 404(c) regulation and may also provide educational  material
to their  employees,  (ii)  employers  who  provide  post-retirement  Employees'
Beneficiary  Associations  ("VEBA") and require  investments that respond to the
impact of Federal  regulations,  (iii)  insurance  companies with the day-to-day
management of uninvested  cash balances as well as with  longer-term  investment
needs, and (iv) charitable and not-for-profit organizations,  such as endowments
and  foundations,  demanding  investment  management  solutions that balance the
requirement  for sufficient  current  income to meet operating  expenses and the
need for capital appreciation to meet future investment objectives.

Northern employs a team approach to the investment  management of the Portfolio,
relying upon investment  professionals  under the leadership of James M. Snyder,
Chief Investment Officer and Executive Vice President of Northern.

         Under its Advisory Agreement with the Trust,  Northern,  subject to the
general supervision of the Trust's Board of Trustees,  is responsible for making
investment  decisions for the Portfolio and placing purchase and sale orders for
the  portfolio  transactions  of the  Portfolio.  In connection  with  portfolio
transactions for the Portfolio,  which are generally done at a net price without
a broker's  commission,  Northern's  Advisory  Agreement  provides that Northern
shall attempt to obtain the best net price and execution.

         Northern's  investment  advisory  duties for the Trust are  carried out
through its Trust  Department.  On occasions when Northern deems the purchase or
sale of a security to be in the best interests of the Portfolio as well as other
fiduciary  or agency  accounts  managed by it  (including  any other  portfolio,
investment  company  or  account  for  which  Northern  acts  as  adviser),  the
Investment Advisory Agreement provides that Northern, to the extent permitted by
applicable  laws and  regulations,  may aggregate  the  securities to be sold or
purchased  for the  Portfolio  with those to be sold or purchased for such other
accounts  in order to  obtain  best net  price  and  execution.  In such  event,
allocation  of the  securities  so  purchased  or sold,  as well as the expenses
incurred in the transaction, will be made by Northern in the manner it considers
to be most  equitable  and  consistent  with its  fiduciary  obligations  to the
Portfolio and other accounts  involved.  In some  instances,  this procedure may
adversely  affect the size of the position  obtainable  for the Portfolio or the
amount  of the  securities  that are able to be sold for the  Portfolio.  To the
extent  that the  execution  and price  available  from more than one  broker or
dealer are believed to be comparable,  the Investment Advisory Agreement permits
Northern,  at its  discretion  but  subject  to  applicable  law,  to select the
executing broker or dealer on the basis of Northern's opinion of the reliability
and quality of such broker or dealer.

         The  Advisory  Agreement  provides  that  Northern  may render  similar
services to others so long as its services under such Agreement are not impaired
thereby.  The Advisory  Agreement  also provides  that the Trust will  indemnify
Northern against certain  liabilities  (including  liabilities under the Federal
securities laws relating to untrue  statements or omissions of material fact and
actions  that are in  accordance  with the terms of the  Agreement)  or, in lieu
thereof, contribute to resulting losses.

         Under its  Transfer  Agency  Agreement  with the  Trust,  Northern  has
undertaken to (1) answer customer inquiries  regarding the current yield of, and
certain other matters  (e.g.  account  status  information)  pertaining  to, the
Trust, (2) process purchase and redemption transactions,  including transactions
generated by any service  provided  outside of the  Agreement  by Northern,  its
affiliates or  correspondent  banks whereby  customer  account cash balances are
automatically  invested in shares of the Portfolio,  and the disbursement of the
proceeds of redemptions,  (3) establish and maintain  separate  omnibus accounts
with respect to shareholders investing through Northern or any of its affiliates
and  correspondent  banks and act as transfer  agent and perform  sub-accounting
services  with respect to each such  account,  (4) provide  periodic  statements
showing account balances,  (5) mail reports and proxy materials to shareholders,
(6) provide  information  in  connection  with the  preparation  by the Trust of
various  regulatory  reports and prepare reports to the Trustees and management,
(7) answer  inquiries  (including  requests for  prospectuses  and statements of
additional  information,  and  assistance  in  the  completion  of  new  account
applications)  from  investors  and  respond  to all  requests  for  information
regarding the Trust (such as current price, recent performance,  and yield data)
and  questions  relating to accounts of  investors  (such as possible  errors in
statements, and transactions), (8) respond to and seek to resolve all complaints
of investors  with  respect to the Trust or their  accounts,  (9) furnish  proxy
statements  and  proxies,  annual  and  semi-annual  financial  statements,  and
dividend,  distribution and tax notices to investors, (10) furnish the Trust all
pertinent Blue Sky information,  (11) perform all required tax withholding, (12)
preserve  records,  and (13) furnish  necessary  office  space,  facilities  and
personnel.  Northern  may  appoint  one  or  more  sub-transfer  agents  in  the
performance of its services.

         As  compensation  for the  services  rendered  by  Northern  under  the
Transfer  Agency  Agreement  with  respect  to  the  Shares  described  in  this
Additional  Statement  and the  assumption  by  Northern  of  related  expenses,
Northern is entitled to a fee from the Trust, payable monthly, at an annual rate
equal to $18 for each subaccount relating to such Shares of the Portfolio.  This
fee which is borne solely by the Shares  described in this Additional  Statement
and not by the  Portfolio's  other share  classes,  is subject to annual  upward
adjustments  based on  increases  in the  Consumer  Price  Index  for All  Urban
Consumers,  provided that Northern may  permanently or temporarily  waive all or
any portion of any upward adjustment. Different transfer agency fees are payable
with respect to the Portfolio's  different share classes.  Northern's affiliates
and  correspondent  banks may receive  compensation  for performing the services
described in the preceding  paragraph  that Northern  would  otherwise  receive.
Conflict-of-interest  restrictions  under state and Federal law  (including  the
Employee  Retirement  Income  Security  Act of 1974) may apply to the receipt by
such affiliates or correspondent  banks of such  compensation in connection with
the investment of fiduciary funds in Shares of the Portfolio.

         Under its Custodian  Agreement  with the Trust,  Northern (1) holds the
Portfolio's  cash and  securities,  (2)  maintains  such cash and  securities in
separate  accounts  in the  name  of  the  Portfolio,  (3)  makes  receipts  and
disbursements  of funds on behalf of the Portfolio,  (4) receives,  delivers and
releases  securities on behalf of the  Portfolio,  (5) collects and receives all
income,  principal and other payments in respect of the  Portfolio's  securities
held by Northern under the Custodian Agreement, and (6) maintains the accounting
records of the Trust.  Northern may employ one or more  subcustodians,  provided
that Northern,  subject to certain  monitoring  responsibilities,  shall have no
more  responsibility  or  liability  to the Trust on  account  of any  action or
omission of any subcustodian so employed than such  subcustodian has to Northern
and that the  responsibility  or liability of the subcustodian to Northern shall
conform  to  the  resolution  of  the  Trustees  of the  Trust  authorizing  the
appointment of the particular subcustodian.  Northern may also appoint agents to
carry out such of the provisions of the Custodian Agreement as Northern may from
time to time direct, provided that the appointment of an agent shall not relieve
Northern of any of its responsibilities under the Agreement.

         As compensation  for the services  rendered to the Trust by Northern as
custodian, and the assumption by Northern of certain related expenses,  Northern
is entitled to payment from the Trust as follows:  (i) $18,000  annually for the
Portfolio, plus (ii) 1/100th of 1% annually of the Portfolio's average daily net
assets to the extent they exceed $100 million, plus (iii) a fixed dollar fee for
each trade in portfolio  securities,  plus (iv) a fixed dollar fee for each time
that  Northern as  custodian  receives  or  transmits  funds via wire,  plus (v)
reimbursement  of expenses  incurred by Northern  as  custodian  for  telephone,
postage, courier fees, office supplies and duplicating.  The fees referred to in
clauses  (iii)  and (iv) are  subject  to  annual  upward  adjustments  based on
increases in the Consumer  Price Index for All Urban  Consumers,  provided  that
Northern may  permanently or temporarily  waive all or any portion of any upward
adjustment.  Northern's  fees  under the  Custodian  Agreement  are  subject  to
reduction based on the Portfolio's daily uninvested cash balances (if any).

         Unless  sooner  terminated,  each of the Advisory  Agreement,  Transfer
Agency  Agreement and Custodian  Agreement  between  Northern and the Trust will
continue in effect with  respect to the  Portfolio  until  April 30,  2000,  and
thereafter for successive  12-month  periods,  provided that the  continuance is
approved at least annually (1) by the vote of a majority of the Trustees who are
not parties to the agreement or "interested persons" (as such term is defined in
the 1940 Act) of any party  thereto,  cast in person at a meeting called for the
purpose of voting on such  approval  and (2) by the Trustees or by the vote of a
majority of the  outstanding  shares of the  Portfolio  (as defined  below under
"Other  Information").  Each agreement is terminable at any time without penalty
by the Trust (by specified  Trustee or  shareholder  action) on 60 days' written
notice to Northern and by Northern on 60 days' written notice to the Trust.

         Banking laws and regulations  currently prohibit a bank holding company
registered  under the Federal  Bank  Holding  Company Act of 1956 or any bank or
non-bank   affiliate  thereof  from  sponsoring,   organizing,   controlling  or
distributing the shares of a registered open-end investment company continuously
engaged in the issuance of its shares,  but such banking laws and regulations do
not prohibit such a holding  company or affiliate or banks generally from acting
as  investment  adviser,  transfer  agent  or  custodian  to such an  investment
company,  or from purchasing  shares of such a company as agent for and upon the
order  of  customers.  Northern  believes  that  it  may  perform  the  services
contemplated by its agreements with the Trust without  violation of such banking
laws or  regulations,  which are applicable to it. It should be noted,  however,
that future changes in either Federal or state statutes and regulations relating
to the permissible activities of banks and their subsidiaries or affiliates,  as
well as future  judicial  or  administrative  decisions  or  interpretations  of
current  and future  statutes  and  regulations,  could  prevent  Northern  from
continuing to perform such services for the Trust.

         Should future legislative,  judicial or administrative  action prohibit
or restrict  the  activities  of Northern in  connection  with the  provision of
services on behalf of the Trust, the Trust might be required to alter materially
or  discontinue  its  arrangements  with  Northern  and  change  its  method  of
operations.  It is not  anticipated,  however,  that any  change in the  Trust's
method of operations would affect the net asset value per share of the Portfolio
or  result  in a  financial  loss  to  any  shareholder.  Moreover,  if  current
restrictions preventing a bank from legally sponsoring,  organizing, controlling
or distributing shares of an open-end investment company were relaxed, the Trust
expects that  Northern and its  affiliates  would  consider the  possibility  of
offering to perform some or all of the  services now provided by First Data.  It
is not possible, of course, to predict whether or in what form such restrictions
might be relaxed or the terms upon which Northern and its affiliates might offer
to provide services for consideration by the Trustees.

         Northern is active as an  underwriter of municipal  instruments.  Under
the 1940 Act, the Portfolio is precluded,  subject to certain  exceptions,  from
purchasing in the primary  market those  municipal  instruments  with respect to
which  Northern  is  serving  as a  principal  underwriter.  In the  opinion  of
Northern,  this  limitation  will not  significantly  affect the  ability of the
Portfolio to pursue its investment objective.

         Under a Service Mark License  Agreement with the Trust,  Northern Trust
Corporation has agreed that the name "Northern  Institutional Funds" may be used
in connection with the Trust's business on a royalty-free basis.  Northern Trust
Corporation has reserved to itself the right to grant the non-exclusive right to
use the name "Northern  Institutional  Funds" to any other person. The Agreement
provides  that at such time as the  Agreement is no longer in effect,  the Trust
will cease using the name "Northern Institutional Funds."

Portfolio Transactions

         To the extent that the Portfolio  effects  brokerage  transactions with
First Data or any  broker/dealer  affiliated  directly  or  indirectly  with the
Investment  Adviser,  such transactions,  including the frequency  thereof,  the
receipt of any commissions payable in connection therewith, and the selection of
the  affiliated  broker/dealer  effecting  such  transactions,  will be fair and
reasonable to the shareholders of the Portfolio.

Co-Administrators and Distributor

         Northern and FDISG,  4400 Computer  Drive,  Westborough,  Massachusetts
01581,  act as  co-administrators  for the Portfolio  under a  Co-Administration
Agreement  with the Trust.  Subject to the  general  supervision  of the Trust's
Board  of  Trustees,  Northern  and  FDISG  (the  "Co-Administrators")   provide
supervision of all aspects of the Trust's non-investment advisory operations and
perform various corporate secretarial, treasury and blue sky services, including
but not limited to: (a) maintaining  office facilities and furnishing  corporate
officers  for the Trust;  (b)  furnishing  data  processing  services,  clerical
services, and executive and administrative  services and standard stationery and
office supplies; (c) performing all functions ordinarily performed by the office
of a corporate treasurer,  and furnishing the services and facilities ordinarily
incident thereto,  such as expense accrual monitoring and payment of the Trust's
bills, preparing monthly reconciliation of the Trust's expense records, updating
projections of annual expenses,  preparing  materials for review by the Board of
Trustees and compliance  testing;  (d) preparing and  submitting  reports to the
Trust's   shareholders  and  the  SEC;  (e)  preparing  and  printing  financial
statements;  (f) preparing monthly Portfolio profile reports;  (g) preparing and
filing the Trust's  Federal and state tax returns  (other than those required to
be filed by the Trust's custodian and transfer agent) and providing  shareholder
tax  information  to the Trust's  transfer  agent;  (h)  assisting  in marketing
strategy   and  product   development;   (i)   performing   oversight/management
responsibilities,  such as the  supervision  and  coordination of certain of the
Trust's service  providers;  (j) effecting and maintaining,  as the case may be,
the  registration  of shares of the Trust for sale under the securities  laws of
various  jurisdictions;  (k) assisting in maintaining corporate records and good
standing  status of the Trust in its state of  organization;  and (l) monitoring
the Trust's  arrangements  with respect to services provided by Servicing Agents
to  their  customers  who are the  beneficial  owners  of  shares,  pursuant  to
servicing agreements between the Trust and such Servicing Agents.

         Subject to the limitations  described  below, as compensation for their
administrative   services  and  the   assumption   of  related   expenses,   the
Co-Administrators  are entitled to a fee from the Portfolio,  computed daily and
payable  monthly,  at an annual rate of .10% of the average  daily net assets of
the  Portfolio.  The  Co-Administrators  will  reimburse  the  Portfolio for its
expenses (including  administration fees payable to the  Co-Administrators,  but
excluding advisory fees, transfer agency fees,  servicing fees and extraordinary
expenses) which exceed on an annualized  basis .10% of the  Portfolio's  average
daily net assets.

         Unless sooner terminated, the Co-Administration Agreement will continue
in effect until April 30, 2001, and  thereafter  for  successive  one-year terms
with respect to the Portfolio,  provided that the agreement is approved annually
(1) by the Board of Trustees or (2) by the vote of a majority of the outstanding
shares of the Portfolio (as defined below under "Other  Information"),  provided
that in either  event the  continuance  is also  approved  by a majority  of the
Trustees who are not parties to the Agreement and who are not interested persons
(as defined in the 1940 Act) of any party  thereto,  by vote cast in person at a
meeting called for the purpose of voting on such approval. The Co-Administration
Agreement is terminable at any time after April 30, 2001, without penalty by the
Trust  on at  least  60  days  written  notice  to the  Co-Administrators.  Each
Co-Administrator may terminate the  Co-Administration  Agreement with respect to
itself at any time  after  April 30,  2001  without  penalty on at least 60 days
written notice to the Trust and the other Co-Administrator.

         The Trust may terminate the Co-Administration  Agreement prior to April
30, 2001 in the event that the Trust or its shareholders incur damages in excess
of $100,000 as a result of the willful  misfeasance,  bad faith or negligence of
the  Co-Administrators,  or the  reckless  disregard  of their  duties under the
Agreement. The Trust may also terminate the Co-Administration Agreement prior to
April 30, 2001 in the event that the  Co-Administrators  fail to meet one of the
performance standards set forth in the Agreement.

         The Trust has entered into a Distribution  Agreement  with FDDI,  under
which FDDI, as agent,  sells Shares of the Portfolio on a continuous basis. FDDI
pays the cost of printing and  distributing  prospectuses to persons who are not
shareholders  of the Trust  and of sales  presentations,  advertising  and other
distribution  efforts.  No compensation is payable by the Trust to FDDI for such
distribution services.

         The Co-Administration Agreement provides that the Co-Administrators may
render similar services to others so long as their services under such Agreement
are not impaired thereby. The Co-Administration Agreement also provides that the
Trust will  indemnify  each  Co-Administrator  against all claims  except  those
resulting  from  the  willful  misfeasance,  bad  faith  or  negligence  of such
Co-Administrator,  or the  Co-Administrator's  breach  of  confidentiality.  The
Distribution  Agreement  provides  that the Trust will  indemnify  FDDI  against
certain liabilities  relating to untrue statements or omissions of material fact
except those  resulting from the reliance on information  furnished to the Trust
by  FDDI,  or  those  resulting  from  the  willful  misfeasance,  bad  faith or
negligence of FDDI, or FDDI's breach of confidentiality.  FDDI is a wholly-owned
subsidiary  of  FDISG,  which  is  a  wholly-owned   subsidiary  of  First  Data
Corporation.

Counsel and Auditors

         Drinker Biddle & Reath LLP, with offices at One Logan Square,  18th and
Cherry Streets,  Philadelphia,  Pennsylvania 19103-6996, serve as counsel to the
Trust.

         Ernst & Young LLP, independent auditors,  233 S. Wacker Drive, Chicago,
Illinois  60606,  have been  selected as  auditors of the Trust.  In addition to
audit  services,  Ernst & Young LLP reviews  the  Trust's  Federal and state tax
returns,  and provides  consultation  and  assistance  on  accounting,  internal
control and related matters.

In-Kind Purchases and Redemptions

         Payment for Shares of the Portfolio may, in the discretion of Northern,
be made in the form of  securities  that  are  permissible  investments  for the
Portfolio as described in the  Prospectus.  For further  information  about this
form of payment,  contact  Northern.  In connection  with an in-kind  securities
payment, the Portfolio will require,  among other things, that the securities be
valued on the day of purchase in accordance with the pricing methods used by the
Portfolio and that the Portfolio  receive  satisfactory  assurances that it will
have  good and  marketable  title to the  securities  received  by it;  that the
securities  be in proper form for transfer to the  Portfolio;  and that adequate
information be provided  concerning the basis and other tax matters  relating to
the securities.

         Although  the  Portfolio  generally  will  redeem  Shares  in cash,  it
reserves the right to pay  redemptions by a  distribution  in-kind of securities
(instead of cash) from the Portfolio.  The securities  distributed in-kind would
be readily marketable and would be valued for this purpose using the same method
employed  in  calculating  the  Portfolio's  net  asset  value per  share.  If a
shareholder  receives redemption proceeds in-kind, the shareholder should expect
to incur  transaction  costs upon the disposition of the securities  received in
the redemption.


Third-Party Fees and Requirements

         Shares are sold and redeemed without any purchase or redemption  charge
imposed by the Trust,  although Northern and other institutions may charge their
customers for services provided in connection with their investments.

         The  exercise  of  voting  rights  and the  delivery  to  Customers  of
shareholder  communications  from the Trust will be governed  by the  Customers'
account  agreements with the Institutions.  Customers should read the Prospectus
in connection with any relevant agreement describing the services provided by an
Institution and any related requirements and charges, or contact the Institution
at which the Customer maintains its account for further information.

                                         PERFORMANCE INFORMATION

         The  performance  of a class of shares of the Portfolio may be compared
to those of other money  market  funds with similar  investment  objectives  and
other relevant indices or to rankings prepared by independent  services or other
financial or industry publications that monitor the performance of mutual funds.
For  example,  the  performance  of a class of shares  may be  compared  to data
prepared by IBC Financial Data, Inc. or other independent  mutual fund reporting
services.  Performance data as reported in national financial  publications such
as Money Magazine,  Morningstar,  Forbes,  Barron's, The Wall Street Journal and
The New York Times, or in publications of a local or regional  nature,  may also
be used in comparing the performance of a class of shares of the Portfolio.

           From  time  to  time,   the  Portfolio  may  advertise  its  "yield,"
           "effective  yield,"   "tax-equivalent   yield"  and   "tax-equivalent
           effective  yield." These yield figures will  fluctuate,  are based on
           historical   earnings  and  are  not  intended  to  indicate   future
           performance. "Yield" refers to the net investment income generated by
           an investment in the Portfolio over a seven-day period  identified in
           the  advertisement.  This net investment income is then "annualized."
           That  is,  the  amount  of net  investment  income  generated  by the
           investment during that week is assumed to be generated each week over
           a 52-week period and is shown as a percentage of the investment.

         In arriving at quotations as to "yield," the Trust first determines the
net change,  exclusive of capital  changes,  during the seven-day  period in the
value of a  hypothetical  pre-existing  account having a balance of one share at
the  beginning  of the period,  then divides such net change by the value of the
account at the  beginning  of the period to obtain the base period  return,  and
then multiplies the base period return by 365/7.

         "Effective yield" is calculated similarly but, when annualized, the net
investment  income  earned by an  investment  in the  Portfolio is assumed to be
reinvested.  The  "effective  yield"  will be  slightly  higher than the "yield"
because of the compounding effect of this assumed  reinvestment.  The "effective
yield" with  respect to the Shares of the  Portfolio  is computed by adding 1 to
the base period return  (calculated as above),  raising the sum to a power equal
to 365 divided by 7, and subtracting 1 from the result.

         The  "tax-equivalent  yield"  demonstrates  the level of taxable  yield
necessary to produce an after-tax yield  equivalent to the Portfolio's  tax-free
yield. It is calculated by taking that portion of the seven-day "yield" which is
tax-exempt and adjusting it to reflect the tax savings  associated with a stated
tax rate.  The  "tax-equivalent  current  yield"  will always be higher than the
Portfolio's yield.

         "Tax-equivalent  yield" is computed by dividing the tax-exempt  portion
of the yield by 1 minus a stated income tax rate and then adding the quotient to
the  taxable  portion  of the  yield,  if  any.  There  may  be  more  than  one
tax-equivalent yield if more than one stated income tax rate is used.

         The "tax-equivalent  effective yield" demonstrates the level of taxable
yield  necessary to produce an after-tax  yield  equivalent  to the  Portfolio's
tax-free  effective  yield.  It is  calculated  by taking  that  portion  of the
seven-day  "effective yield" which is tax-exempt and adjusting it to reflect the
tax savings  associated  with a stated tax rate. The  "tax-equivalent  effective
yield" will always be higher than the Portfolio's effective yield.

         "Tax-equivalent effective yield" is computed by dividing the tax-exempt
portion of the  effective  yield by 1 minus a stated income  tax-rate,  and then
adding the quotient to the taxable portion of the effective yield, if any. There
may be more than one  tax-equivalent  effective  yield,  if more than one stated
income tax rate is used.

         Quotations of yield, effective yield,  tax-equivalent current yield and
tax-equivalent effective yield provided by the Trust are carried to at least the
nearest hundredth of one percent.  Any fees imposed by Northern,  its affiliates
or  correspondent  banks on their  customers in connection  with  investments in
Shares of the Portfolio are not  reflected in the  calculation  of yields of the
Portfolio.

         The Portfolio's yields may not provide a basis for comparison with bank
deposits and other  investments  which provide a fixed yield for a stated period
of time.  The  Portfolio's  yields  fluctuate,  unlike  bank  deposits  or other
investments  which  pay  a  fixed  yield  for  a  stated  period  of  time.  The
annualization  of one  week's  income is not  necessarily  indicative  of future
actual yields. Actual yields will depend on such variables as portfolio quality,
average portfolio maturity, the type of portfolio instruments acquired,  changes
in money market interest rates, portfolio expenses and other factors. Yields are
one basis  investors may use to analyze the Portfolio as compared to other money
market  funds and other  investment  vehicles.  However,  yields of other  money
market funds and other investment  vehicles may not be comparable because of the
foregoing  variables,  and  differences  in the  methods  used in valuing  their
portfolio instruments, computing net asset value and determining yield.

         The  Portfolio  may also  quote  from time to time its total  return in
accordance with SEC regulations.

         The yields  and total  returns of the  Portfolio's  Service  Shares and
Premier Shares are calculated  separately from the calculations of the yield and
total return of the Shares described in this Additional Statement.

                                         AMORTIZED COST VALUATION

         As stated in the  Prospectus,  the  Portfolio  seeks to  maintain a net
asset value of $1.00 per share and, in this  connection,  values its instruments
on the basis of amortized  cost  pursuant to Rule 2a-7 under the 1940 Act.  This
method  values a security  at its cost on the date of  purchase  and  thereafter
assumes  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  Portfolio  would  receive  if it sold the  instrument.
During such periods the yield to investors in the Portfolio may differ  somewhat
from that obtained in a similar  entity which uses  available  indications as to
market value to value its  portfolio  instruments.  For  example,  if the use of
amortized  cost  resulted in a lower  (higher)  aggregate  Portfolio  value on a
particular day, a prospective  investor in the Portfolio would be able to obtain
a somewhat  higher  (lower) yield and ownership  interest than would result from
investment  in such similar  entity and existing  investors  would  receive less
(more) investment income and ownership interest. However, the Trust expects that
the procedures and limitations  referred to in the following  paragraphs of this
section will tend to minimize the differences referred to above.

         Under Rule 2a-7,  the Trust's  Board of Trustees,  in  supervising  the
Trust's operations and delegating special  responsibilities  involving portfolio
management to Northern,  has established  procedures  that are intended,  taking
into account current market conditions and the Portfolio's investment objective,
to stabilize the net asset value of the Portfolio,  as computed for the purposes
of purchases  and  redemptions,  at $1.00 per share.  The  Trustees'  procedures
include  periodic  monitoring of the difference (the "Market Value  Difference")
between  the  amortized  cost value per share and the net asset  value per share
based upon  available  indications  of market value.  Available  indications  of
market  value  used  by  the  Trust  consist  of  actual  market  quotations  or
appropriate  substitutes which reflect current market conditions and include (a)
quotations  or estimates of market value for  individual  portfolio  instruments
and/or (b) values for  individual  portfolio  instruments  derived  from  market
quotations   relating  to  varying   maturities  of  a  class  of  money  market
instruments.  In the event the Market Value Difference of the Portfolio  exceeds
certain limits or Northern  believes that the Market Value Difference may result
in  material   dilution  or  other  unfair  results  to  investors  or  existing
shareholders, the Trust will take action in accordance with the 1940 Act and the
Trustees  will take  such  steps as they  consider  appropriate  (e.g.,  selling
portfolio  instruments  to  shorten  average  portfolio  maturity  or to realize
capital gains or losses,  reducing or suspending  shareholder  income  accruals,
redeeming  shares  in-kind or  utilizing  a net asset value per share based upon
available  indications of market value which under such circumstances would vary
from $1.00) to  eliminate  or reduce to the extent  reasonably  practicable  any
material dilution or other unfair results to investors or existing  shareholders
which might arise from Market Value Differences.  In particular,  if losses were
sustained by the Portfolio, the number of outstanding shares might be reduced in
order to maintain a net asset value per share of $1.00.  Such reduction would be
effected  by  having  each   shareholder   proportionately   contribute  to  the
Portfolio's  capital the  necessary  shares to restore  such net asset value per
share.  Each shareholder  will be deemed to have agreed to such  contribution in
these circumstances by investing in the Portfolio.

         Rule  2a-7  requires  that  the  Portfolio  limit  its  investments  to
instruments which Northern determines (pursuant to guidelines established by the
Board of  Trustees)  to present  minimal  credit  risks and which are  "Eligible
Securities" as defined by the SEC and described in the Prospectus. The Rule also
requires  that  the  Portfolio  maintain  a  dollar-weighted  average  portfolio
maturity  (not more than 90 days)  appropriate  to its policy of  maintaining  a
stable net asset value per share and  precludes  the purchase of any  instrument
deemed  under the Rule to have a remaining  maturity  of more than 397  calendar
days. Should the disposition of a portfolio security result in a dollar-weighted
average portfolio maturity of more than 90 days, the Rule requires the Portfolio
to invest its available  cash in such a manner as to reduce such maturity to the
prescribed limit as soon as reasonably practicable.

                                          DESCRIPTION OF SHARES

         The Trust  Agreement  permits the Trust's Board of Trustees to issue an
unlimited number of full and fractional shares of beneficial  interest of one or
more  separate  series   representing   interests  in  one  or  more  investment
portfolios.  The Trustees may hereafter create series in addition to the Trust's
nineteen  existing  series,  which represent  interests in the Trust's  nineteen
respective portfolios. The Trust Agreement also permits the Board of Trustees to
classify  or  reclassify  any  unissued  shares  into  classes  within a series.
Pursuant to such  authority,  the Trustees  have  authorized  the issuance of an
unlimited  number of shares of beneficial  interest in three separate classes of
shares of the  Portfolio:  Shares,  Service  Shares  and  Premier  Shares.  This
Additional  Statement (and the related Prospectus) relates only to the Shares of
the Portfolio  discussed  herein.  For information on the other share classes in
the Portfolio and on the Trust's other investment portfolios, call the toll-free
number on page 1.

         Under the terms of the Trust Agreement,  each share of the Portfolio is
without par value,  represents an equal proportionate  interest in the Portfolio
with each other  share of its class in the  Portfolio  and is  entitled  to such
dividends and  distributions out of the income belonging to the Portfolio as are
declared by the Trustees. Upon the liquidation of the Portfolio, shareholders of
each class of the  Portfolio  are  entitled  to share pro rata in the net assets
belonging  to that  class  available  for  distribution.  Shares do not have any
preemptive or  conversion  rights.  The right of  redemption is described  under
"About Your Account - Selling Shares and Account Policies and Other Information"
in the  Prospectus  and under  "Amortized  Cost  Valuation"  in this  Additional
Statement.  In  addition,  pursuant to the terms of the 1940 Act, the right of a
shareholder  to redeem  shares and the date of payment by the  Portfolio  may be
suspended  for more than seven days (a) for any period during which the New York
Stock  Exchange is closed,  other than the  customary  weekends or holidays,  or
trading  in  the  markets  the  Portfolio  normally  utilizes  is  closed  or is
restricted as determined by the SEC, (b) during any emergency,  as determined by
the SEC, as a result of which it is not reasonably practicable for the Portfolio
to dispose of  instruments  owned by it or fairly to determine  the value of its
net assets,  or (c) for such other period as the SEC may by order permit for the
protection of the  shareholders of the Portfolio.  The Trust may also suspend or
postpone the  recordation  of the transfer of its shares upon the  occurrence of
any of the  foregoing  conditions.  In  addition,  shares of the  Portfolio  are
redeemable at the  unilateral  option of the Trust if the Trustees  determine in
their  sole  discretion  that  failure to so redeem  may have  material  adverse
consequences  to the  shareholders  of the  Portfolio.  Shares  when  issued  as
described in the Prospectus are validly  issued,  fully paid and  nonassessable,
except  as  stated  below.   In  the  interests  of  economy  and   convenience,
certificates representing Shares of the Portfolio are not issued.

         The proceeds  received by the  Portfolio  for each issue or sale of its
shares, and all net investment income, realized and unrealized gain and proceeds
thereof, subject only to the rights of creditors, will be specifically allocated
to and constitute the underlying assets of the Portfolio.  The underlying assets
of the Portfolio will be segregated on the books of account, and will be charged
with the liabilities  and with a share of the general  liabilities of the Trust.
Expenses with respect to the  Portfolio are normally  allocated in proportion to
the net asset value of the Portfolio except where allocations of direct expenses
can otherwise be fairly made.

         Rule 18f-2 under the 1940 Act provides  that any matter  required to be
submitted to the holders of the outstanding  voting  securities of an investment
company  such as the Trust  shall not be deemed to have been  effectively  acted
upon unless approved by the holders of a majority of the  outstanding  shares of
the Portfolio,  if it is affected by the matter.  The Portfolio is affected by a
matter  unless it is clear that the interests of the Portfolio in the matter are
substantially  identical as the other  investment  portfolios or that the matter
does not affect any interest of the  Portfolio.  Under the Rule, the approval of
an  investment  advisory  agreement  or any change in a  fundamental  investment
policy would be  effectively  acted upon with respect to the  Portfolio  only if
approved by a majority of the outstanding shares of the Portfolio.  However, the
Rule also provides  that the  ratification  of the  appointment  of  independent
accountants,  the approval of principal  underwriting contracts and the election
of Trustees are exempt from the separate  voting  requirements  stated above. In
addition, shareholders of each of the classes in the Portfolio have equal voting
rights except that only shares of a particular  class of the  Portfolio  will be
entitled  to vote  on  matters  submitted  to a vote of  shareholders  (if  any)
relating to  shareholder  servicing  expenses and transfer  agency fees that are
payable by that class.

         The Trust is not required to hold annual meetings of  shareholders  and
does  not  intend  to  hold  such  meetings.  In the  event  that a  meeting  of
shareholders is held, each share of the Trust will be entitled, as determined by
the Trustees without the vote or consent of shareholders, either to one vote for
each share or to one vote for each dollar of net asset value represented by such
shares on all matters  presented  to  shareholders,  including  the  election of
Trustees  (this method of voting being  referred to as  "dollar-based  voting").
However,  to the extent required by the 1940 Act or otherwise  determined by the
Trustees,  series and classes of the Trust will vote separately from each other.
Shareholders of the Trust do not have  cumulative  voting rights in the election
of Trustees  and,  accordingly,  the  holders of more than 50% of the  aggregate
voting power of the Trust may elect all of the Trustees irrespective of the vote
of the other shareholders.  Meetings of shareholders of the Trust, or any series
or class thereof,  may be called by the Trustees,  certain  officers or upon the
written request of holders of 10% or more of the shares entitled to vote at such
meeting. The shareholders of the Trust will have voting rights only with respect
to the limited number of matters specified in the Trust Agreement and such other
matters as the Trustees may  determine or may be required by law. The Trust does
not presently intend to hold annual meetings of shareholders  except as required
by the 1940 Act or other  applicable  law. The  Trustees  will  promptly  call a
meeting  of  shareholders  to vote  upon  the  removal  of any  Trustee  when so
requested  in writing by the  record  holders of 10% or more of the  outstanding
shares.  To the extent  required by law,  the Trust will  assist in  shareholder
communications in connection with such a meeting.

         The  Trust  Agreement  authorizes  the  Trustees,  without  shareholder
approval  (except as stated in the next  paragraph),  to cause the Trust, or any
series thereof, to merge or consolidate with any corporation, association, trust
or  other  organization  or sell or  exchange  all or  substantially  all of the
property  belonging  to the  Trust,  or any series  thereof.  In  addition,  the
Trustees, without shareholder approval, may adopt a "master-feeder" structure by
investing  substantially  all of the  assets  of a  series  of the  Trust in the
securities of another open-end investment company or pooled portfolio.

         The Trust  Agreement also  authorizes the Trustees,  in connection with
the merger,  consolidation,  termination or other reorganization of the Trust or
any series or class, to classify the  shareholders of any class into one or more
separate groups and to provide for the different treatment of shares held by the
different groups, provided that such merger, consolidation, termination or other
reorganization  is approved by a majority of the outstanding  voting  securities
(as  defined  in the  1940  Act) of  each  group  of  shareholders  that  are so
classified.

         The Trust  Agreement  permits the Trustees to amend the Trust Agreement
without a shareholder vote. However, shareholders of the Trust have the right to
vote on any  amendment:  (i) that would  adversely  affect the voting  rights of
shareholders; (ii) that is required by law to be approved by shareholders; (iii)
that would amend the voting provisions of the Trust Agreement;  or (iv) that the
Trustees determine to submit to shareholders.

         The Trust  Agreement  permits  the  termination  of the Trust or of any
series or class of the Trust (i) by a majority of the affected shareholders at a
meeting of shareholders of the Trust,  series or class; or (ii) by a majority of
the Trustees without  shareholder  approval if the Trustees  determine that such
action is in the best interest of the Trust or its shareholders. The factors and
events that the  Trustees  may take into  account in making  such  determination
include (i) the  inability  of the Trust or any series or class to maintain  its
assets at an appropriate size; (ii) changes in laws or regulations governing the
Trust or any series or class thereof,  or affecting  assets of the type in which
it  invests;  or (iii)  economic  developments  or trends  having a  significant
adverse impact on their business or operations.

         Under  the  Delaware   Business   Trust  Act  (the   "Delaware   Act"),
shareholders  are not  personally  liable  for  obligations  of the  Trust.  The
Delaware  Act  entitles  shareholders  of the  Trust to the same  limitation  of
liability as is available to  shareholders of private  for-profit  corporations.
However,  no  similar  statutory  or other  authority  limiting  business  trust
shareholder  liability exists in many other states.  As a result,  to the extent
that the Trust or a shareholder is subject to the jurisdiction of courts in such
other  states,  those  courts may not apply  Delaware  law and may  subject  the
shareholders to liability. To offset this risk, the Trust Agreement (i) contains
an express  disclaimer of  shareholder  liability for acts or obligations of the
Trust and requires that notice of such  disclaimer  be given in each  agreement,
obligation and instrument  entered into or executed by the Trust or its Trustees
and (ii)  provides for  indemnification  out of the  property of the  applicable
series  of  the  Trust  of  any  shareholder  held  personally  liable  for  the
obligations  of the Trust solely by reason of being or having been a shareholder
and not because of the shareholder's acts or omissions or for some other reason.
Thus,  the risk of a  shareholder  incurring  financial  loss  beyond his or her
investment because of shareholder liability is limited to circumstances in which
all of the following factors are present:  (1) a court refuses to apply Delaware
law;  (2) the  liability  arises  under  tort  law or,  if not,  no  contractual
limitation of liability is in effect; and (3) the applicable series of the Trust
is unable to meet its obligations.

         The Trust  Agreement  provides  that the Trustees will not be liable to
any person other than the Trust or a shareholder  and that a Trustee will not be
liable  for  any act as a  Trustee.  However,  nothing  in the  Trust  Agreement
protects a Trustee  against any liability to which he or she would  otherwise be
subject  by reason of  willful  misfeasance,  bad  faith,  gross  negligence  or
reckless disregard of the duties involved in the conduct of his or her office.

         The Trust Agreement provides for indemnification of Trustees,  officers
and  agents of the Trust  unless  the  recipient  is liable by reason of willful
misfeasance,  bad faith,  gross  negligence or reckless  disregard of the duties
involved in the conduct of such person's  office.  The Trust Agreement  provides
that  each  shareholder,  by  virtue  of  becoming  such,  will  be held to have
expressly  assented and agreed to the terms of the Trust  Agreement  and to have
become a party thereto.

         In addition to the  requirements  of Delaware law, the Trust  Agreement
provides that a shareholder of the Trust may bring a derivative action on behalf
of the Trust only if the following conditions are met: (a) shareholders eligible
to bring such derivative  action under Delaware law who hold at least 10% of the
outstanding  shares of the Trust, or 10% of the outstanding shares of the series
or class to which such action relates, must join in the request for the Trustees
to commence  such  action;  and (b) the  Trustees  must be afforded a reasonable
amount of time to consider such shareholder request and to investigate the basis
of such claim. The Trust Agreement also provides that no person,  other than the
Trustees,  who is not a  shareholder  of a  particular  series or class shall be
entitled to bring any derivative  action,  suit or other proceeding on behalf of
or with respect to such series or class. The Trustees will be entitled to retain
counsel or other  advisers  in  considering  the merits of the  request  and may
require an undertaking by the shareholders  making such request to reimburse the
Trust  for the  expense  of any such  advisers  in the event  that the  Trustees
determine not to bring such action.

         The Trustees may appoint separate  Trustees with respect to one or more
series or classes of the Trust's shares (the "Series  Trustees").  To the extent
provided by the Trustees in the appointment of Series Trustees,  Series Trustees
(a) may,  but are not  required  to, serve as Trustees of the Trust or any other
series  or class of the  Trust;  (b) may  have,  to the  exclusion  of any other
Trustee of the Trust, all the powers and authorities of Trustees under the Trust
Agreement with respect to such series or class;  and/or (c) may have no power or
authority  with  respect  to any other  series or class.  The  Trustees  are not
currently considering the appointment of Series Trustees for the Trust.

         As of July  30,  1999,  substantially  all of the  Trust's  portfolios'
outstanding  shares  were held of  record by  Northern  for the  benefit  of its
customers and the customers of its affiliates and correspondent  banks that have
invested in the  portfolios.  As of the same date,  Northern  possessed  sole or
shared voting and/or  investment power for its customer accounts with respect to
less  than 10% of the  Trust's  outstanding  shares.  As of the same  date,  the
Trust's Trustees and officers as a group owned  beneficially less than 1% of the
outstanding shares of each class of each portfolio.

                                 ADDITIONAL INFORMATION CONCERNING TAXES

General

         The  Portfolio  will  elect  to  be  taxed  separately  as a  regulated
investment company (a "RIC"). To qualify as a RIC, the Portfolio  generally must
distribute an amount equal to at least the sum of 90% of its investment  company
taxable income and 90% of its net tax-exempt interest income (net income and the
excess of net short-term  capital gain over net long-term capital loss), if any,
for each  year  (the  "Distribution  Requirement")  and  satisfy  certain  other
requirements.

         The  Portfolio  must  derive  at least  90% of its  gross  income  from
dividends, interest, certain payments with respect to securities loans and gains
from the sale or other disposition of stock or securities or foreign currencies,
or from other  income  derived with respect to its business of investing in such
stock,  securities  or  currencies.  Also,  at the close of each  quarter of the
taxable  year,  it is generally  required  that at least 50% of the value of the
Portfolio's  assets  must  consist  of cash  and  cash  items,  U.S.  Government
securities,  securities  of other RICs and  securities  of other  issuers (as to
which  the  Portfolio  has not  invested  more than 5% of the value of its total
assets in securities of such issuer and as to which the Portfolio  does not hold
more than 10% of the outstanding voting securities of such issuer),  and no more
than 25% of the value of the  Portfolio's  total  assets may be  invested in the
securities  of any  one  issuer  (other  than  U.S.  Government  securities  and
securities  of other  RICs),  or in two or more  issuers  which  such  Portfolio
controls and which are engaged in the same or similar trades or businesses.  The
Portfolio intends to comply with these RIC requirements.

         If for any taxable year the  Portfolio was not to qualify as a RIC, all
of its taxable income would be subject to tax at regular corporate rates without
any  deduction  for   distributions   to   shareholders.   In  such  event,  all
distributions  by the  Portfolio  would be taxable to  shareholders  as ordinary
income to the extent of the  Portfolio's  current and  accumulated  earnings and
profits, and would be eligible for the dividends-received  deduction in the case
of corporate shareholders.

         The Internal Revenue Code imposes a nondeductible 4% excise tax on RICs
that fail  currently to distribute an amount equal to specified  percentages  of
their  ordinary  taxable  income and capital gain net income  (excess of capital
gains  over  capital   losses).   The  Portfolio   intends  to  make  sufficient
distributions or deemed distributions of its ordinary taxable income and capital
gain net income each calendar  year to avoid  liability for this excise tax. The
Portfolio also intends to make sufficient  distributions or deemed distributions
each year to avoid liability for corporate  income tax. If the Portfolio were to
fail to make sufficient  distributions,  it could be liable for corporate income
tax and for excise tax.

         The Trust will be  required in certain  cases to withhold  and remit to
the U.S.  Treasury 31% of taxable  dividends and gross sale proceeds paid to any
shareholder (i) who has provided either an incorrect tax  identification  number
or no number at all, (ii) who is subject to backup  withholding  by the Internal
Revenue  Service  for  failure to report the  receipt  of  taxable  interest  or
dividend income properly,  or (iii) who has failed to certify to the Trust, when
required to do so, that he or she is not subject to backup  withholding  or that
he or she is an "exempt recipient."

Special Tax Considerations

         As described in the  Prospectus,  the  Portfolio is designed to provide
investors  with  Federally  tax-exempt  interest  income.  The  Portfolio is not
intended to  constitute  a balanced  investment  program and is not designed for
investors seeking capital appreciation or maximum tax-exempt income irrespective
of fluctuations in principal.  Shares of the Portfolio would not be suitable for
tax-exempt  institutions or for retirement  plans qualified under Section 401 of
the Code, H.R. 10 plans and individual  retirement  accounts  because such plans
and  accounts  are  generally  tax-exempt  and,  therefore,  would  not gain any
additional benefit from the Portfolio's dividends being tax-exempt. In addition,
the Portfolio may not be an appropriate  investment for persons or entities that
are  "substantial  users" of facilities  financed by private  activity  bonds or
"related  persons"  thereof.  "Substantial  user" is defined under U.S. Treasury
Regulations to include a non-exempt  person which  regularly uses a part of such
facilities  in its trade or  business  and whose  gross  revenues  derived  with
respect to the facilities  financed by the issuance of bonds are more than 5% of
the total revenues derived by all users of such facilities,  which occupies more
than 5% of the usable area of such  facilities or for which such facilities or a
part thereof were specifically constructed,  reconstructed or acquired. "Related
persons" include certain related natural  persons,  affiliated  corporations,  a
partnership and its partners and an S corporation and its shareholders.

         In order for the  Portfolio  to pay Federal  exempt-interest  dividends
with respect to any taxable year, at the close of each taxable  quarter at least
50% of  the  aggregate  value  of  the  Portfolio  must  consist  of  tax-exempt
obligations.  An exempt-interest dividend is any dividend or part thereof (other
than a  capital  gain  dividend)  paid by the  Portfolio  and  designated  as an
exempt-interest  dividend in a written notice mailed to  shareholders  not later
than 60 days  after the close of the  Portfolio's  taxable  year.  However,  the
aggregate  amount of dividends so designated by the Portfolio  cannot exceed the
excess of the amount of interest  exempt from tax under  Section 103 of the Code
received by the Portfolio during the taxable year over any amounts disallowed as
deductions under Sections 265 and 171(a)(2) of the Code. The percentage of total
dividends paid by the Portfolio with respect to any taxable year which qualifies
as  Federal  exempt-interest  dividends  will be the same  for all  shareholders
receiving dividends from the Portfolio with respect to such year.

         Interest on indebtedness incurred by a shareholder to purchase or carry
shares of the  Portfolio  generally  is not  deductible  for Federal  income tax
purposes  to  the  extent  attributable  to   exempt-interest-dividends.   If  a
shareholder  holds Portfolio shares for six months or less, any loss on the sale
or exchange of those  shares will be  disallowed  to the extent of the amount of
exempt-interest  dividends  earned  with  respect to the  shares.  The  Treasury
Department,  however, is authorized to issue regulations  reducing the six-month
holding  requirement  to a period of not less than the greater of 31 days or the
period between  regular  distributions  for investment  companies that regularly
distribute at least 90% of its net tax-exempt interest.  No such regulations had
been issued as of the date of this Additional Statement.

         Corporate   taxpayers  will  be  required  to  take  into  account  all
exempt-interest  dividends from the Portfolio in determining certain adjustments
for alternative minimum tax purposes.

         The  Portfolio  will  determine  annually  the  percentages  of its net
investment  income  which is exempt from tax,  which  constitute  an item of tax
preference  for  purposes of the Federal  alternative  minimum tax, and which is
fully  taxable,  and will apply these  percentages  uniformly  to all  dividends
declared from net  investment  income during that year.  These  percentages  may
differ significantly from the actual percentages for any particular day.

         Shareholders  will be advised  annually  as to the  Federal  income tax
consequences of distributions made by the Portfolios.

Foreign Investors

         Foreign shareholders  generally will be subject to U.S. withholding tax
at a rate of 30% (or a lower treaty rate, if applicable) on distributions by the
Portfolio of net investment  income,  other ordinary income,  and the excess, if
any, of net  short-term  capital  gain over net  long-term  capital loss for the
year,  regardless of the extent,  if any, to which the income or gain is derived
from  non-U.S.   investments  of  the  Portfolio.   For  this  purpose,  foreign
shareholders include individuals other than U.S. citizens, residents and certain
nonresident aliens, and foreign corporations,  partnerships, trusts and estates.
Different tax consequences may apply to a foreign  shareholder engaged in a U.S.
trade or business or present in the U.S. for 183 days or more in a year. Foreign
shareholders  should  consult their tax advisers  regarding the U.S. and foreign
tax consequences of investing in the Portfolio.

Conclusion

         The foregoing  discussion is based on Federal tax laws and  regulations
which  are in  effect on the date of this  Additional  Statement.  Such laws and
regulations may be changed by legislative or  administrative  action. No attempt
is made to present a detailed  explanation of the tax treatment of the Portfolio
or its  shareholders,  and the  discussion  here  and in the  Prospectus  is not
intended as a substitute for careful tax planning.  Shareholders  are advised to
consult their tax advisers with specific  reference to their own tax  situation,
including the application of state and local taxes.

         Although the  Portfolio  expects to qualify as a RIC and to be relieved
of all or  substantially  all Federal  taxes,  depending  upon the extent of its
activities  in states and  localities  in which its offices are  maintained,  in
which its  agents  or  independent  contractors  are  located  or in which it is
otherwise deemed to be conducting business,  the Portfolio may be subject to the
tax laws of such states or localities.


                                            OTHER INFORMATION

         The  Prospectus  and this  Additional  Statement do not contain all the
information included in the Registration  Statement filed with the SEC under the
Securities  Act of 1933 with  respect to the  securities  offered by the Trust's
Prospectus.  Certain  portions of the  Registration  Statement have been omitted
from the  Prospectus  and this  Additional  Statement  pursuant to the rules and
regulations of the SEC. The Registration  Statement including the exhibits filed
therewith may be examined at the office of the SEC in Washington, D.C.

         The  Portfolio is  responsible  for the payment of its  expenses.  Such
expenses include, without limitation,  the fees and expenses payable to Northern
and First Data,  brokerage fees and  commissions,  fees for the  registration or
qualification  of  Portfolio  shares  under  Federal or state  securities  laws,
expenses  of the  organization  of the  Portfolio,  taxes,  interest,  costs  of
liability insurance, fidelity bonds, indemnification or contribution, any costs,
expenses or losses arising out of any liability of or claim for damages or other
relief  asserted  against the Trust for  violation  of any law,  legal,  tax and
auditing  fees and expenses,  expenses of preparing  and printing  prospectuses,
statements of additional information,  proxy materials,  reports and notices and
the  printing  and  distributing  of the same to the  Trust's  shareholders  and
regulatory authorities,  compensation and expenses of its Trustees, expenses for
industry  organizations such as the Investment Company Institute,  miscellaneous
expenses and extraordinary expenses incurred by the Trust.

         The term  "majority of the  outstanding  shares" of either the Trust or
the  Portfolio  means,  with respect to the approval of an  investment  advisory
agreement or a change in a fundamental investment  restriction,  the vote of the
lesser of (i) 67% or more of the shares of the Trust or the Portfolio present at
a  meeting,  if the  holders of more than 50% of the  outstanding  shares of the
Trust or the Portfolio are present or  represented  by proxy,  or (ii) more than
50% of the outstanding shares of the Trust or the Portfolio.

         Statements  contained in the prospectus or in this Additional Statement
as to the  contents  of any  contract  or other  documents  referred  to are not
necessarily complete, and in each instance reference is made to the copy of such
contract or other document filed as an exhibit to the Registration  Statement of
which  the  Prospectus  and this  Additional  Statement  form a part,  each such
statement being qualified in all respects by such reference.



<PAGE>


36

                                                APPENDIX A

COMMERCIAL PAPER RATINGS

A Standard & Poor's ("S&P")  commercial paper rating is a current  assessment of
the likelihood of timely payment of debt having an original  maturity of no more
than 365 days. The following  summarizes the rating  categories used by Standard
and  Poor's  for  commercial  paper  that is a  permissible  investment  for the
Portfolios:

         "A-1" - Obligations are rated in the highest  category  indicating that
         the  obligor's  capacity  to  meet  its  financial  commitment  on  the
         obligation is strong.  Within this category,  certain  obligations  are
         designated  with a plus sign (+).  This  indicates  that the  obligor's
         capacity  to meet its  financial  commitment  on these  obligations  is
         extremely strong.

         "A-2" -  Obligations  are  somewhat  more  susceptible  to the  adverse
         effects  of changes  in  circumstances  and  economic  conditions  than
         obligations  in  higher  rating  categories.   However,  the  obligor's
         capacity  to  meet  its  financial  commitment  on  the  obligation  is
         satisfactory.

Moody's commercial paper ratings are opinions of the ability of issuers to repay
punctually  senior debt obligations not having an original maturity in excess of
one  year,  unless  explicitly  noted.  The  following   summarizes  the  rating
categories used by Moody's for commercial paper that is a permissible investment
for the Portfolios:

         "Prime-1"  -  Issuers  (or  supporting  institutions)  have a  superior
         ability for repayment of senior  short-term debt  obligations.  Prime-1
         repayment  ability  will often be  evidenced  by many of the  following
         characteristics:   leading   market   positions   in   well-established
         industries;  high  rates  of  return  on funds  employed;  conservative
         capitalization structure 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.

         "Prime-2" - Issuers (or supporting  institutions) have a strong ability
         for repayment of senior short-term debt obligations. This will normally
         be evidenced by many of the characteristics cited above but to a lesser
         degree.  Earnings trends and coverage ratios,  while sound, may be more
         subject  to  variation.  Capitalization  characteristics,  while  still
         appropriate,  may  be  more  affected  by  external  conditions.  Ample
         alternate liquidity is maintained.

The  following  summarizes  the  rating  categories  used by Duff &  Phelps  for
commercial paper that is a permissible investment for the Portfolios:

         "D-1+" - Debt  possesses  the  highest  certainty  of  timely  payment.
         Short-term  liquidity,  including  internal  operating  factors  and/or
         access to alternative  sources of funds, is outstanding,  and safety is
         just below risk-free U.S. Treasury short-term obligations.

         "D-1" - Debt possesses very high certainty of timely payment. Liquidity
         factors are  excellent  and  supported by good  fundamental  protection
         factors. Risk factors are minor.

         "D-1-" - Debt  possesses high  certainty of timely  payment.  Liquidity
         factors  are  strong  and  supported  by  good  fundamental  protection
         factors. Risk factors are very small.

         "D-2" - Debt  possesses  good  certainty of timely  payment.  Liquidity
         factors and company  fundamentals  are sound.  Although ongoing funding
         needs may  enlarge  total  financing  requirements,  access to  capital
         markets is good. Risk factors are small.

Duff & Phelps employs three  designations,  "D-1+," "D-1" and "D-1-," within the
highest rating category.

Fitch IBCA short-term  ratings apply to debt obligations that have time horizons
of less  than 12  months  for most  obligations,  or up to three  years for U.S.
public finance securities.  The following  summarizes the rating categories used
by Fitch IBCA for short-term  obligations  that are permissible  investments for
the Portfolios:

         "F1" - Securities possess the highest credit quality.  This designation
         indicates  the  strongest  capacity  for timely  payment  of  financial
         commitments  and may  have an added  "+" to  denote  any  exceptionally
         strong credit feature.

         "F2"  -  Securities  possess  good  credit  quality.  This  designation
         indicates  a  satisfactory  capacity  for timely  payment of  financial
         commitments, but the margin of safety is not as great as in the case of
         the higher ratings.

Thomson  BankWatch  short-term  ratings  assess the  likelihood  of an  untimely
payment of principal and interest of debt instruments  with original  maturities
of one year or less.  The  following  summarizes  the  ratings  used by  Thomson
BankWatch for short-term  obligations  that are permissible  investments for the
Portfolios:

         "TBW-1"  - This  designation  represents  Thomson  BankWatch's  highest
         category  and  indicates  a very high  likelihood  that  principal  and
         interest will be paid on a timely basis.

         "TBW-2"  - This  designation  represents  Thomson  BankWatch's  second-
         highest  category  and  indicates  that  while  the  degree  of  safety
         regarding  timely  repayment of principal  and interest is strong,  the
         relative degree of safety is not as high as for issues rated "TBW-1."

CORPORATE AND MUNICIPAL LONG-TERM DEBT RATINGS

The following summarizes the ratings used by Standard & Poor's for corporate and
municipal debt that are permissible investments for the Portfolios:

         "AAA" - An obligation  rated "AAA" has the highest  rating  assigned by
         Standard  &  Poor's.  The  obligor's  capacity  to meet  its  financial
         commitment on the obligation is extremely strong.

         "AA"  - An  obligation  rated  "AA"  differs  from  the  highest  rated
         obligations  only in small degree.  The obligor's  capacity to meet its
         financial commitment on the obligation is very strong.

PLUS (+) OR MINUS (-) - The "AA"  rating  classification  may be modified by the
addition  of a plus or minus  sign to show  relative  standing  within the major
rating categories.

"r" - This symbol is attached to the  ratings of  instruments  with  significant
noncredit  risks.  It  highlights  risks to principal or  volatility of expected
returns  which  are  not  addressed  in the  credit  rating.  Examples  include:
obligations  linked  or  indexed  to  equities,   currencies,   or  commodities;
obligations  exposed  to  severe  prepayment  risk - such  as  interest-only  or
principal-only  mortgage  securities;   and  obligations  with  unusually  risky
interest terms, such as inverse floaters.

The following summarizes the ratings used by Moody's for corporate and municipal
long-term debt that are permissible investments for the Portfolios:

         "Aaa" - Bonds are  judged  to be of the best  quality.  They  carry the
         smallest  degree of investment  risk and are  generally  referred to as
         "gilt  edged."  Interest  payments  are  protected  by a large or by an
         exceptionally  stable margin and principal is secure. While the various
         protective  elements  are  likely to  change,  such  changes  as can be
         visualized  are  most  unlikely  to  impair  the  fundamentally  strong
         position of such issues.

         "Aa" -  Bonds  are  judged  to be of  high  quality  by all  standards.
         Together with the "Aaa" group they comprise what are generally known as
         high- grade  bonds.  They are rated  lower than the best bonds  because
         margins of  protection  may not be as large as in "Aaa"  securities  or
         fluctuation of protective elements may be of greater amplitude or there
         may be other  elements  present  which make the  long-term  risk appear
         somewhat larger than the "Aaa" securities.

Con.  (---) - Bonds for which the security  depends upon the  completion of some
act or the  fulfillment  of some  condition are rated  conditionally.  These are
bonds secured by (a) earnings of projects  under  construction,  (b) earnings of
projects  unseasoned  in  operating  experience,  (c)  rentals  which begin when
facilities are completed, or (d) payments to which some other limiting condition
attaches.  Parenthetical  rating denotes probable credit stature upon completion
of construction or elimination of basis of condition.

Note:   Moody's  applies  numerical   modifiers  1,  2,  and  3  in  the  rating
classification  "Aa". The modifier 1 indicates that the obligation  ranks in the
higher end of its generic rating category;  the modifier 2 indicates a mid-range
ranking;  and the modifier 3 indicates a ranking in the lower end of its generic
rating category.

The following  summarizes  the long-term  debt ratings used by Duff & Phelps for
corporate and municipal long-term debt that are permissible  investments for the
Portfolios:

         "AAA" - Debt is considered  to be of the highest  credit  quality.  The
         risk  factors  are  negligible,  being  only  slightly  more  than  for
         risk-free U.S. Treasury debt.

         "AA" - Debt is  considered  to be of high  credit  quality.  Protection
         factors are strong.  Risk is modest but may vary  slightly from time to
         time because of economic conditions.

To provide more detailed indications of credit quality, the "AA" and "A" ratings
may be modified by the addition of a plus (+) or minus (-) sign to show relative
standing within these major categories.

The  following  summarizes  the  ratings  used by Fitch IBCA for  corporate  and
municipal bonds that are permissible investments for the Portfolio:

         "AAA" - Bonds  considered  to be  investment  grade and of the  highest
         credit quality.  These ratings denote the lowest  expectation of credit
         risk and are assigned only in case of exceptionally strong capacity for
         timely  payment  of  financial  commitments.  This  capacity  is highly
         unlikely to be adversely affected by foreseeable events.

         "AA" - Bonds  considered to be investment grade and of very high credit
         quality. These ratings denote a very low expectation of credit risk and
         indicate  very  strong   capacity  for  timely   payment  of  financial
         commitments.   This  capacity  is  not   significantly   vulnerable  to
         foreseeable events.

To provide more detailed  indications of credit  quality,  the Fitch IBCA rating
"AA" may be  modified  by the  addition  of a plus (+) or minus (-) sign to show
relative standing within the major rating category.

Thomson BankWatch  assesses the likelihood of an untimely repayment of principal
or  interest  over the term to maturity  of long term debt and  preferred  stock
which are issued by United States commercial banks,  thrifts and non-bank banks;
non-United States banks; and broker-dealers. The following summarizes the rating
categories  used by Thomson  BankWatch  for  long-term  debt  ratings  for those
investments which are permissible investments for the Portfolios:

         "AAA" - This designation  indicates that the ability to repay principal
         and interest on a timely basis is extremely high.

         "AA" - This  designation  indicates  a very  strong  ability  to  repay
         principal and interest on a timely basis, with limited incremental risk
         compared to issues rated in the highest category.

PLUS (+) OR MINUS (-) The  ratings  "AAA"  and "AA" may  include a plus or minus
sign designation which indicates where within the respective  category the issue
is placed.

Municipal Note Ratings

A Standard and Poor's rating  reflects the liquidity  concerns and market access
risks unique to notes due in three years or less.  The following  summarizes the
ratings used by Standard & Poor's  Ratings  Group for  municipal  notes that are
permissible investments for the Portfolios:

         "SP-1" - The issuers of these municipal notes exhibit a strong capacity
         to pay principal and interest.  Those issues determined to possess very
         strong characteristics are given a plus (+) designation.

         "SP-2" - The  issuers of these  municipal  notes  exhibit  satisfactory
         capacity to pay  principal  and interest,  with some  vulnerability  to
         adverse financial and economic changes over the term of the notes.

Moody's  ratings for state and municipal  notes and other  short-term  loans are
designated Moody's Investment Grade ("MIG") and variable rate demand obligations
are  designated  Variable  Moody's  Investment  Grade  ("VMIG").   Such  ratings
recognize the differences between short-term credit risk and long-term risk. The
following  summarizes  the  ratings  by  Moody's  Investors  Service,  Inc.  for
short-term notes that are permissible investments for the Portfolios:

         "MIG-1"/"VMIG-1"  - This  designation,  denotes best quality.  There is
         present strong protection by established cash flows, superior liquidity
         support  or   demonstrated   broad-based   access  to  the  market  for
         refinancing.

         "MIG-2"/"VMIG-2" - This designation, denotes high quality, with margins
         of protection  that are ample although not so large as in the preceding
         group.

Fitch  IBCA  and  Duff &  Phelps  use the  short-term  ratings  described  under
Commercial  Paper Ratings for municipal notes that are  permissible  investments
for the Portfolios.




<PAGE>


                                                  PART B

                                   STATEMENT OF ADDITIONAL INFORMATION

                                              SERVICE SHARES
                                              PREMIER SHARES

                                       NORTHERN INSTITUTIONAL FUNDS

                                           MUNICIPAL PORTFOLIO

         This  Statement  of  Additional   Information  dated  October  20  (the
"Additional  Statement")  is not a prospectus.  Copies of the  prospectus  dated
October  20, 1999 for the Service  Shares and  Premier  Shares of the  Municipal
Portfolio (the "Portfolio") of Northern  Institutional  Funds (the "Prospectus")
may be  obtained  without  charge by  calling  1-800-637-1380  (toll-free).  The
Portfolio also offers one additional share class,  Shares, which is described in
a separate statement of additional information.  Capitalized terms not otherwise
defined have the same meaning as in the Prospectus.



<PAGE>


                                                  INDEX

                                                                            Page

ADDITIONAL INVESTMENT INFORMATION.........................................  3
             Classification and History...................................  3
             Investment Objective, Strategies and Risks...................  3
             Investment Restrictions......................................  12

ADDITIONAL TRUST INFORMATION..............................................  15
             Trustees and Officers........................................  15
             Investment Adviser, Transfer Agent and Custodian.............  19
             Portfolio Transactions.......................................  22
             Co-Administrators and Distributor............................  23
             Counsel and Auditors.........................................  24
             In-Kind Purchases and Redemptions............................  24
             Third-Party Fees and Requirements............................  25

PERFORMANCE INFORMATION...................................................  25

AMORTIZED COST VALUATION..................................................  27

DESCRIPTION OF SERVICE
SHARES AND PREMIER SHARES.................................................  28

ADDITIONAL INFORMATION CONCERNING TAXES...................................  31
             General......................................................  31
             Special Tax Considerations...................................  32
             Foreign Investors............................................  33
             Conclusion...................................................  34

SERVICE PLAN..............................................................  34

OTHER INFORMATION.........................................................  36

APPENDIX A................................................................  A-1

No  person  has  been  authorized  to  give  any  information  or  to  make  any
representations not contained in this Additional  Statement or in the Prospectus
in connection with the offering of Service Shares and Premier Shares made by the
Prospectus and, if given or made, such information or  representations  must not
be relied upon as having been  authorized by the Trust or its  distributor.  The
Prospectus does not constitute an offering by the Trust or by the distributor in
any jurisdiction in which such offering may not lawfully be made.

An  investment  in the Portfolio is not a deposit of any bank and is not insured
or  guaranteed  by the  Federal  Deposit  Insurance  Corporation  or  any  other
government  agency.  Although the Portfolio  seeks to preserve the value of your
investment at $1.00 per share,  it is possible to lose money by investing in the
Portfolio.


<PAGE>


                                    ADDITIONAL INVESTMENT INFORMATION

Classification and History

         Northern  Institutional Funds (the "Trust") is an open-end,  management
investment  company.  The  Portfolio  is  classified  as  diversified  under the
Investment Company Act of 1940, as amended (the "1940 Act").

         The Portfolio is a series of the Trust,  which was formed as a Delaware
business trust on July 1, 1997 under an Agreement and  Declaration of Trust (the
"Trust  Agreement").   The  Trust  is  the  result  of  a  reorganization  of  a
Massachusetts business trust known as The Benchmark Funds on March 31, 1998. The
Trust's name was changed from The Benchmark Funds to the Northern  Institutional
Funds on July 15,  1998.  The Trust  also  offers six fixed  income,  four money
market, one balanced,  and seven equity  portfolios,  which are not described in
this document.

Investment Objective, Strategies and Risks

         The following  supplements  the  investment  objective,  strategies and
risks of the Portfolio as set forth in the Prospectus. Except as expressly noted
below, the Portfolio's  investment objective and policies may be changed without
shareholder approval.

Commercial Paper, Bankers' Acceptances, Certificates of Deposit and Time
Deposits

         Commercial  paper  represents  short-term  unsecured  promissory  notes
issued in  bearer  form by banks or bank  holding  companies,  corporations  and
finance companies.  Certificates of deposit are negotiable  certificates  issued
against funds  deposited in a commercial  bank for a definite period of time and
earning a specified return.  Bankers' acceptances are negotiable drafts or bills
of  exchange,  normally  drawn by an importer  or  exporter to pay for  specific
merchandise,  which are "accepted" by a bank,  meaning, in effect, that the bank
unconditionally  agrees to pay the face  value of the  instrument  on  maturity.
Fixed time deposits are bank  obligations  payable at a stated maturity date and
bearing interest at a fixed rate. Fixed time deposits may be withdrawn on demand
by the  investor,  but may be subject to early  withdrawal  penalties  that vary
depending upon market  conditions and the remaining  maturity of the obligation.
There are no  contractual  restrictions  on the right to  transfer a  beneficial
interest  in a fixed time  deposit  to a third  party.  Bank notes and  bankers'
acceptances  rank junior to deposit  liabilities of the bank and pari passu with
other senior,  unsecured  obligations of the bank.  Bank notes are classified as
"other   borrowings"  on  a  bank's  balance  sheet,  while  deposit  notes  and
certificates  of deposit are classified as deposits.  Bank notes are not insured
by the Federal Deposit Insurance Corporation or any other insurer. Deposit notes
are insured by the Federal Deposit  Insurance  Corporation only to the extent of
$100,000 per depositor per bank.

         The Portfolio may invest a portion of its assets in the  obligations of
foreign banks and foreign branches of domestic banks.  Such obligations  include
Eurodollar  Certificates of Deposit  ("ECDs") which are U.S.  dollar-denominated
certificates  of deposit issued by offices of foreign and domestic banks located
outside the United States;  Eurodollar  Time Deposits  ("ETDs"),  which are U.S.
dollar-denominated  deposits  in a foreign  branch  of a U.S.  bank or a foreign
bank;  Canadian Time Deposits  ("CTDs"),  which are essentially the same as ETDs
except they are issued by Canadian offices of major Canadian banks; Schedule Bs,
which are obligations  issued by Canadian branches of foreign or domestic banks;
Yankee Certificates of Deposit ("Yankee CDs") which are U.S.  dollar-denominated
certificates  of deposit  issued by a U.S.  branch of a foreign bank and held in
the United States;  and Yankee Bankers'  Acceptances  ("Yankee BAs"),  which are
U.S. dollar-denominated bankers' acceptances issued by a U.S.
branch of a foreign bank and held in the United States.

Zero Coupon

         To the extent consistent with its investment  objective,  the Portfolio
may invest in zero coupon bonds. Zero coupon bonds are debt securities issued or
sold at a discount  from their face value and which do not entitle the holder to
any  periodic  payment of interest  prior to maturity or a specified  date.  The
original issue discount varies depending on the time remaining until maturity or
cash payment date,  prevailing interest rates, the liquidity of the security and
perceived credit quality of the issuer.  These securities also may take the form
of debt securities that have been stripped of their unmatured  interest coupons,
the coupons  themselves or receipts or  certificates  representing  interests in
such  stripped  debt  obligations  or coupons.  The market prices of zero coupon
bonds  generally are more  volatile  than the market prices of interest  bearing
securities  and are likely to respond to a greater degree of changes in interest
rates than interest  bearing  securities  having  similar  maturities and credit
quality.

         Zero coupon bonds involve the additional risk that,  unlike  securities
that  periodically pay interest to maturity,  the Portfolio will realize no cash
until a specified  future  payment date unless a portion of such  securities  is
sold and, if the issuer of such securities defaults, the Portfolio may obtain no
return at all on its investment.  In addition, even though such securities do no
provide  for  the  payment  of  current  interest  in  cash,  the  Portfolio  is
nonetheless  required to accrue income on such  investment for each taxable year
and generally is required to distribute  such accrued amounts (net of deductible
expenses,  if any) to avoid being  subject to tax.  Because no cash is generally
received at the time of the accrual,  the Portfolio may be required to liquidate
other  portfolio  securities to obtain  sufficient  cash to satisfy  Federal tax
distribution requirements applicable to the Portfolio.

U.S. Government Obligations

         Examples  of the  types  of U.S.  Government  obligations  that  may be
acquired by the  Portfolio  include  U.S.  Treasury  Bills,  Treasury  Notes and
Treasury  Bonds and the  obligations  of Federal  Home Loan Banks,  Federal Farm
Credit Banks,  Federal Land Banks, the Federal Housing  Administration,  Farmers
Home  Administration,  Export-Import  Bank of the United States,  Small Business
Administration,  Federal  National  Mortgage  Association  ("FNMA"),  Government
National Mortgage Association ("GNMA"), General Services Administration, Central
Bank for Cooperatives, Federal Home Loan Mortgage Corporation ("FHLMC"), Federal
Intermediate Credit Banks, and the Maritime Administration.

 .........Securities  guaranteed  as  to  principal  and  interest  by  the  U.S.
Government,  its  agencies or  instrumentalities  are also deemed to include (a)
securities  for which the  payment of  principal  and  interest  is backed by an
irrevocable  letter of credit  issued by the U.S.  Government  or any  agency or
instrumentality  thereof,  and (b)  participations  in  loans  made  to  foreign
governments or their agencies that are so guaranteed.

 .........To the extent consistent with its investment  objective,  the Portfolio
may invest in a variety of U.S. Treasury  obligations and obligations  issued by
or guaranteed by the U.S. Government or its agencies and instrumentalities.  Not
all U.S. Government  obligations carry the same credit support. No assurance can
be  given  that the U.S.  Government  would  provide  financial  support  to its
agencies or  instrumentalities  if it is not obligated to do so by law. There is
no assurance that these  commitments  will be undertaken or complied with in the
future.  In addition,  the secondary market for certain  participations in loans
made to foreign governments or their agencies may be limited.

Asset-Backed Securities

         To the extent  described in the Prospectus,  the Portfolio may purchase
asset-backed securities,  which are securities backed by mortgages,  installment
contracts,  credit card  receivables  or other assets.  Asset-backed  securities
represent  interests in "pools" of assets in which payments of both interest and
principal  on the  securities  are made  periodically,  thus in effect  "passing
through"  such  payments  made by the  individual  borrowers  on the assets that
underlie the securities,  net of any fees paid to the issuer or guarantor of the
securities.  The  average  life  of  asset-backed  securities  varies  with  the
maturities  of  the   underlying   instruments,   and  the  average  life  of  a
mortgage-backed  instrument,  in particular,  is likely to be substantially less
than the original  maturity of the mortgage pools underlying the securities as a
result of mortgage  prepayments.  For this and other  reasons,  an  asset-backed
security's stated maturity may be shortened, and the security's total return may
be difficult to predict precisely.

         If an  asset-backed  security is purchased  at a premium,  a prepayment
rate that is  faster  than  expected  will  reduce  yield to  maturity,  while a
prepayment  rate that is slower than expected  will have the opposite  effect of
increasing  yield  to  maturity.  Conversely,  if an  asset-backed  security  is
purchased at a discount,  faster than expected prepayments will increase,  while
slower than expected prepayments will decrease, yield to maturity.

         Prepayments on asset-backed  securities generally increase with falling
interest rates and decrease with rising interest rates; furthermore,  prepayment
rates are  influenced by a variety of economic and social  factors.  In general,
the collateral  supporting  non-mortgage  asset-backed  securities is of shorter
maturity  than  mortgage  loans  and is less  likely to  experience  substantial
prepayments.

         Asset-backed   securities   acquired  by  the   Portfolio  may  include
collateralized  mortgage obligations ("CMOs") issued by private companies.  CMOs
provide  the  holder  with a  specified  interest  in the cash flow of a pool of
underlying  mortgages  or  other  mortgage-backed  securities.  Issuers  of CMOs
ordinarily  elect to be  taxed as  pass-through  entities  known as real  estate
mortgage  investment conduits  ("REMICs").  CMOs are issued in multiple classes,
each with a specified fixed or floating  interest rate and a final  distribution
date.  The relative  payment rights of the various CMO classes may be structured
in a variety of ways. The Portfolio will not purchase  "residual" CMO interests,
which normally exhibit greater price volatility.

         There are a number of  important  differences  among the  agencies  and
instrumentalities of the U.S. Government that issue mortgage-related  securities
and among the securities that they issue. Mortgage-related securities guaranteed
by the GNMA  include  GNMA  Mortgage  Pass-Through  Certificates  (also known as
"Ginnie  Maes"),  which are guaranteed as to the timely payment of principal and
interest  by GNMA and backed by the full faith and credit of the United  States.
GNMA is a  wholly-owned  U.S.  Government  corporation  within the Department of
Housing and Urban  Development.  GNMA  certificates  also are  supported  by the
authority of GNMA to borrow funds from the U.S.  Treasury to make payments under
its guarantee. Mortgage-backed securities issued by FNMA include FNMA Guaranteed
Mortgage  Pass-Through  Certificates  (also known as "Fannie  Maes"),  which are
solely the  obligations  of FNMA and are not backed by or entitled to full faith
and credit of the United States, but are supported by the right of the issuer to
borrow from the  Treasury.  FNMA is a  government-sponsored  organization  owned
entirely  by  private  stockholders.  Fannie  Maes are  guaranteed  as to timely
payment of the  principal  and  interest  by FNMA.  Mortgage-related  securities
issued by the FHLMC  include FHLMC  Mortgage  Participation  Certificates  (also
known as "Freddie Macs" or "Pcs").  FHLMC is a corporate  instrumentality of the
United States,  created pursuant to an Act of Congress,  which is owned entirely
by  Federal  Home  Loan  Banks.  Freddie  Macs  are  not  guaranteed  and do not
constitute a debt or obligation of the United States or of any Federal Home Loan
Bank.  Freddie Macs entitle the holder to timely  payment of interest,  which is
guaranteed  by FHLMC.  FHLMC  guarantees  either  ultimate  collection or timely
payment of all principal  payments on the underlying  mortgage loans. When FHLMC
does not guarantee  timely payment of principal,  FHLMC may remit the amount due
on account of its  guarantee of ultimate  payment of principal at any time after
default on an underlying mortgage,  but in no event later than one year after it
becomes payable.

         Non-mortgage asset-backed securities involve certain risks that are not
presented by mortgage-backed securities. Primarily, these securities do not have
the benefit of the same security interest in the underlying  collateral.  Credit
card  receivables  are  generally  unsecured and the debtors are entitled to the
protection of a number of state and Federal  consumer credit laws, many of which
have  given  debtors  the right to set off  certain  amounts  owed on the credit
cards, thereby reducing the balance due. Most issuers of automobile  receivables
permit the servicers to retain possession of the underlying obligations.  If the
servicer were to sell these  obligations to another party,  there is a risk that
the purchaser  would acquire an interest  superior to that of the holders of the
related  automobile  receivables.  In  addition,  because of the large number of
vehicles involved in a typical issuance and technical  requirements  under state
laws, the trustee for the holders of the automobile  receivables may not have an
effective security interest in all of the obligations  backing such receivables.
Therefore,  there is a possibility that recoveries on repossessed collateral may
not, in some cases, be able to support payments on these securities.

Supranational Bank Obligations

         The  Portfolio  may  invest  in  obligations  of  supranational  banks.
Supranational banks are international banking institutions designed or supported
by national governments to promote economic reconstruction, development or trade
among nations (e.g., the International Bank for Reconstruction and Development).
Obligations of  supranational  banks may be supported by appropriated but unpaid
commitments  of their  member  countries  and there is no  assurance  that these
commitments will be undertaken or met in the future.

Custodial Receipts for Treasury Securities

         The  Portfolio  may  acquire  U.S.  Government  obligations  and  their
unmatured  interest  coupons  that have  been  separated  ("stripped")  by their
holder,  typically  a  custodian  bank  or  investment  brokerage  firm.  Having
separated  the  interest  coupons  from  the  underlying  principal  of the U.S.
Government  obligations,  the holder  will  resell the  stripped  securities  in
custodial receipt programs with a number of different names, including "Treasury
Income  Growth  Receipts"  ("TIGRs")  and  "Certificate  of Accrual on  Treasury
Securities"  ("CATS").  The  stripped  coupons  are  sold  separately  from  the
underlying principal, which is usually sold at a deep discount because the buyer
receives  only the right to receive a future  fixed  payment on the security and
does not receive any rights to periodic interest (cash) payments. The underlying
U.S.  Treasury  bonds and notes  themselves  are held in book-entry  form at the
Federal Reserve Bank or, in the case of bearer  securities  (i.e.,  unregistered
securities  which are  ostensibly  owned by the bearer or  holder),  in trust on
behalf of the owners. Counsel to the underwriters of these certificates or other
evidences of ownership of U.S.  Treasury  securities  have state that,  in their
opinion,  purchasers of the stripped  securities  most likely will be deemed the
beneficial holders of the underlying U.S. Government obligations for Federal tax
purposes.  The  Trust  is  unaware  of  any  binding  legislative,  judicial  or
administrative authority on this issue.

U.S. Treasury STRIPS

         The Treasury Department has facilitated  transfers of ownership of zero
coupon  securities  by accounting  separately  for the  beneficial  ownership of
particular interest coupon and principal payments on Treasury securities through
the Federal  Reserve  book-entry  record-keeping  system.  The  Federal  Reserve
program as  established  by the  Treasury  Department  is known as  "STRIPS"  or
"Separate  Trading of  Registered  Interest and  Principal of  Securities."  The
Portfolio may purchase  securities  registered in the STRIPS program.  Under the
STRIPS program,  the Portfolio will be able to have its beneficial  ownership of
zero coupon securities recorded directly in the book-entry record-keeping system
in lieu of having to hold  certificates  or other  evidences of ownership of the
underlying U.S. Treasury securities.
The Portfolio may acquire securities registered under the STRIPS program.

Variable and Floating Rate Instruments

         With respect to the variable and floating rate  instruments that may be
acquired by the Portfolio as described in the Prospectus, the Investment Adviser
will consider the earning power,  cash flows and other  liquidity  ratios of the
issuers and guarantors of such  instruments  and, if the instruments are subject
to demand  features,  will monitor  their  financial  status and ability to meet
payment on demand.  In  determining  weighted  average  portfolio  maturity,  an
instrument  may,  subject to the Securities and Exchange  Commission (the "SEC")
regulations,  be deemed to have a maturity  shorter  than its  nominal  maturity
based on the period  remaining  until the next interest  rate  adjustment or the
time the  Portfolio  can  recover  payment  of  principal  as  specified  in the
instrument.  Where  necessary  to  ensure  that  a  variable  or  floating  rate
instrument is of the minimum required credit quality, the issuer's obligation to
pay the  principal of the  instrument  will be backed by an  unconditional  bank
letter or line of credit, guarantee or commitment to lend.

     Variable  and  floating  rate  instruments  eligible  for  purchase  by the
Portfolio  include  variable  amount  master  demand  notes,  which  permit  the
indebtedness   thereunder   to  vary  in  addition  to  providing  for  periodic
adjustments in the interest rate.

 .........  Variable and floating rate  instruments  held by the
Portfolio will be subject to the Portfolio's  limitation on illiquid investments
when the Portfolio may not demand  payment of the principal  amount within seven
days absent a reliable trading market.

Investment Companies

         With respect to the  investments  of the Portfolio in the securities of
other  investment  companies,  such  investments  will be  limited  so that,  as
determined  after a purchase  is made,  either (a) not more than 3% of the total
outstanding stock of such investment company will be owned by the Portfolio, the
Trust as a whole and their  affiliated  persons  (as defined in the 1940 Act) or
(b) (i) not more than 5% of the value of the total assets of the Portfolio  will
be invested in the securities of any one investment company;  (ii) not more than
10% of the  value of its total  assets  will be  invested  in the  aggregate  in
securities of investment companies as a group; and (iii) not more than 3% of the
outstanding  voting  stock of any one  investment  company  will be owned by the
Portfolio.

         Certain  investment  companies  whose  securities  are purchased by the
Portfolio may not be obligated to redeem such securities in an amount  exceeding
1% of the investment company's total outstanding securities during any period of
less than 30 days.  Therefore,  such  securities  that exceed this amount may be
illiquid.  Notwithstanding  the  foregoing,  the  Portfolio  may  adhere to more
restrictive  limitations with respect to its investments in securities issued by
other  investment  companies  if required by the SEC or deemed to be in the best
interests of  Investment  Adviser.  If required by the 1940 Act,  the  Portfolio
expects to vote the shares of other investment  companies that are held by it in
the same proportion as the vote of all other holders of such securities.

Yields and Ratings

         The  yields  on  certain   obligations,   including  the  money  market
instruments  in which the  Portfolio  invests,  are  dependent  on a variety  of
factors,  including  general economic  conditions,  conditions in the particular
market  for the  obligation,  financial  condition  of the  issuer,  size of the
offering,  maturity of the obligation  and ratings of the issue.  The ratings of
Standard & Poor's Ratings Group, Inc. ("S&P"),  Moody's Investors Service,  Inc.
("Moody's"),  Duff &  Phelps  Credit  Rating  Co.  ("Duff"),  Fitch  IBCA,  Inc.
("Fitch") and Thomson BankWatch,  Inc. represent their respective opinions as to
the quality of the obligations  they undertake to rate.  Ratings,  however,  are
general and are not  absolute  standards of quality.  Consequently,  obligations
with the same  rating,  maturity  and interest  rate may have  different  market
prices.  For a more  complete  discussion  of  ratings,  see  Appendix A to this
Additional Statement.

         Subject to the limitations stated in the Prospectus, if a security held
by the Portfolio undergoes a rating revision, the Portfolio may continue to hold
the security if the Investment Adviser determine such retention is warranted.

Repurchase Agreements

         The Portfolio may agree to purchase portfolio securities from financial
institutions  subject to the seller's  agreement to  repurchase  them a mutually
agreed upon date and price ("repurchase agreements").  Repurchase agreements are
considered to be loans under the 1940 Act. Although the securities  subject to a
repurchase agreement may bear maturities exceeding one year,  settlement for the
repurchase  agreement  will  never be more than one year  after the  Portfolio's
acquisition  of the  securities  and normally will be within a shorter period of
time. Securities subject to repurchase agreements are held either by the Trust's
custodian  or  subcustodian  (if  any),  or  in  the  Federal   Reserve/Treasury
Book-Entry System.  The seller under a repurchase  agreement will be required to
maintain  the value of the  securities  subject  to the  agreement  in an amount
exceeding the repurchase  price  (including  accrued  interest).  Default by the
seller would, however,  expose the Portfolio to possible loss because of adverse
market  action or delay in connection  with the  disposition  of the  underlying
obligations.


Reverse Repurchase Agreements

         The  Portfolio  may borrow  funds by selling  portfolio  securities  to
financial  institutions  such  as  banks  and  broker/dealers  and  agreeing  to
repurchase  them at a mutually  specified  date and price  ("reverse  repurchase
agreements").   The  Portfolio  may  use  the  proceeds  of  reverse  repurchase
agreements to purchase other securities  either maturing,  or under an agreement
to resell, at a date simultaneous with or prior to the expiration of the reverse
repurchase  agreement.  Reverse  repurchase  agreements  are  considered  to  be
borrowing under the 1940 Act.  Reverse  repurchase  agreements  involve the risk
that the market value of the securities  sold by the Portfolio may decline below
the  repurchase  price.  The  Portfolio  will pay  interest on amounts  obtained
pursuant to a reverse repurchase agreement.  While reverse repurchase agreements
are  outstanding,  the Portfolio  will  segregate  liquid assets in an amount at
least  equal to the  market  value of the  securities,  plus  accrued  interest,
subject to the agreement.

Securities Lending

         Collateral for loans of portfolio  securities made by the Portfolio may
consist of cash, cash  equivalents,  securities issued or guaranteed by the U.S.
Government  or its  agencies  or  irrevocable  bank  letters  of credit  (or any
combination  thereof).  The borrower of securities  will be required to maintain
the market  value of the  collateral  at not less than the  market  value of the
loaned  securities,  and such value will be monitored on a daily basis. When the
Portfolio lends its securities,  it continues to receive  dividends and interest
on the securities loaned and may simultaneously  earn interest on the investment
of the cash collateral.  Although voting rights, or rights to consent, attendant
to securities  on loan pass to the  borrower,  such loans will be called so that
the securities  may be voted by the Portfolio if a material event  affecting the
investment is to occur.

Forward Commitments, When-Issued Securities and Delayed-Delivery Transactions

         The  Portfolio  may  purchase  securities  on a  when-issued  basis  or
purchase or sell securities on a forward  commitment  (sometimes  called delayed
delivery)  basis.  These  transactions  involve a commitment by the Portfolio to
purchase  or sell  securities  at a future  date.  The  price of the  underlying
securities  (usually  expressed  in  terms  of  yield)  and the  date  when  the
securities will be delivered and paid for (the settlement date) are fixed at the
time the transaction is negotiated. When-issued purchases and forward commitment
transactions are normally negotiated directly with the other party.

         The  Portfolio  will  purchase  securities  on a  when-issued  basis or
purchase  or sell  securities  on a  forward  commitment  basis  only  with  the
intention of completing the transaction  and actually  purchasing or selling the
securities. If deemed advisable as a matter of investment strategy, however, the
Portfolio may dispose of or negotiate a commitment  after  entering into it. The
Portfolio  also may sell  securities it has  committed to purchase  before those
securities are delivered to the Portfolio on the settlement  date. The Portfolio
may realize a capital gain or loss in connection with these transactions.

         When the Portfolio  purchases  securities  on a when-issued  or forward
commitment  basis,  the Portfolio  will  segregate  liquid assets having a value
(determined  daily) at least  equal to the  amount of the  Portfolio's  purchase
commitments  until three days prior to the settlement  date, or otherwise  cover
its position.  These  procedures  are designed to ensure that the Portfolio will
maintain  sufficient  assets  at  all  times  to  cover  its  obligations  under
when-issued  purchases,  forward commitments and delayed-delivery  transactions.
For purposes of determining the Portfolio's  average  dollar-weighted  maturity,
the maturity of when-issued or forward commitment  securities will be calculated
from the commitment date.

Municipal Instruments

         Opinions  relating to the  validity  of  municipal  instruments  and to
Federal  and state tax issues  relating  to these  securities  are  rendered  by
counsel to the  respective  issuing  authorities  at the time of issuance.  Such
opinions may contain various assumptions,  qualifications or exceptions that are
reasonably  acceptable to Investment  Adviser.  Neither Trust nor the Investment
Adviser  will  review the  proceedings  relating to the  issuance  of  municipal
instruments or the bases for such opinions.

         Municipal instruments include both "general" and "revenue" obligations.
General obligations are secured by the issuer's pledge of its full faith, credit
and taxing power for the payment of principal and interest.  Revenue obligations
are payable only from the revenues  derived from a particular  facility or class
of facilities  or, in some cases,  from the proceeds of a special  excise tax or
other specific  revenue  source such as lease revenue  payments from the user of
the facility  being  financed.  Industrial  development  bonds are in most cases
revenue  securities  and are not payable from the  unrestricted  revenues of the
issuer.  Consequently,  the credit  quality  of an  industrial  revenue  bond is
usually  directly  related to the credit  standing  of the  private  user of the
facility involved.

         The Portfolio may also invest in "moral  obligation"  bonds,  which are
normally issued by special purpose public authorities.  If the issuer of a moral
obligation  bond is unable to meet its debt  service  obligations  from  current
revenues,  it may draw on a reserve fund (if such a fund has been  established),
the restoration of which is a moral commitment but not a legal obligation of the
state or municipality which created the issuer.

         Within the principal classifications of municipal instruments described
above there are a variety of categories,  including  municipal bonds,  municipal
notes,  municipal leases,  custodial  receipts and  participation  certificates.
Municipal  notes  include  tax,  revenue  and bond  anticipation  notes of short
maturity,  generally less than three years, which are issued to obtain temporary
funds  for  various  public  purposes.   Municipal   leases  and   participation
certificates  are  obligations   issued  by  state  and  local   governments  or
authorities   to  finance  the   acquisition   of  equipment   and   facilities.
Participation   certificates   may  represent   participation  in  a  lease,  an
installment  purchase  contract,  or  a  conditional  sales  contract.   Certain
municipal lease obligations (and related participation certificates) may include
"non-appropriation"   clauses  which  provide  that  the   municipality  has  no
obligation  to make lease or  installment  purchase  payments  in futures  years
unless  money is  appropriated  for such  purpose on a yearly  basis.  Custodial
receipts are underwritten by securities  dealers or banks and evidence ownership
of future interest  payments,  principal  payments or both on certain  municipal
securities.  Municipal  leases (and  participations  in such leases) present the
risk that a municipality will not appropriate funds for the lease payments.  The
Investment Adviser, under the supervision of the Trust's Board of Trustees, will
determine  the credit  quality  of any  unrated  municipal  leases on an ongoing
basis,  including an  assessment of the  likelihood  that the leases will not be
cancelled.

         An issuer's obligations under its municipal  instruments are subject to
the provisions of bankruptcy, insolvency and other laws affecting the rights and
remedies of creditors,  such as the Federal  Bankruptcy  Code, and laws, if any,
which may be enacted by Federal  or state  legislatures  extending  the time for
payment of principal or interest,  or both, or imposing other  constraints  upon
enforcement of such  obligations or upon the ability of  municipalities  to levy
taxes. The power or ability of an issuer to meet its obligations for the payment
of interest on and  principal of its  municipal  instruments  may be  materially
adversely affected by litigation or other conditions.

         From time to time proposals have been  introduced  before  Congress for
the purpose of restricting  or eliminating  the Federal income tax exemption for
interest on municipal instruments. For example, under the Tax Reform Act of 1986
interest on certain  private  activity  bonds must be included in an  investor's
Federal alternative minimum taxable income, and corporate investors must include
all tax-exempt interest in their Federal alternative minimum taxable income. The
Trust cannot predict what legislation,  if any, may be proposed in the future in
Congress  as regards the  Federal  income tax status of  interest  on  municipal
instruments or which  proposals,  if any, might be enacted.  Such proposals,  if
enacted,  might  materially and adversely  affect the  availability of municipal
instruments for investment by the Portfolio and its liquidity and value. In such
an event the Board of  Trustees  would  reevaluate  the  Portfolio's  investment
objective  and  policies  and  consider  changes in their  structure or possible
dissolution.

         Certain  of the  municipal  instruments  held by the  Portfolio  may be
insured as to the timely  payment  of  principal  and  interest.  The  insurance
policies will usually be obtained by the issuer of the  Municipal  Instrument at
the time of its original  issuance.  In the event that the issuer defaults on an
interest or principal payment, the insurer will be notified and will be required
to make payment to the  bondholders.  There is,  however,  no guarantee that the
insurer will meet its obligations.  In addition, such insurance will not protect
against  market  fluctuations  caused by  changes  in  interest  rates and other
factors. The Portfolio may invest more than 25% of its total assets in municipal
instruments covered by insurance policies.

         As described in the  Prospectus,  the Portfolio may invest in municipal
leases,  which may be  considered  liquid under  guidelines  established  by the
Trust's Board of Trustees.  The guidelines will provide for determination of the
liquidity  of a  municipal  lease  obligation  based on  factors  including  the
following:  (1) the frequency of trades and quotes for the  obligation;  (2) the
number of dealers  willing to  purchase or sell the  security  and the number of
other  potential  buyers;  (3) the willingness of dealers to undertake to make a
market in the security; and (4) the nature of the marketplace trades,  including
the time needed to dispose of the security,  the method of soliciting offers and
the mechanics of transfer.  The Investment Adviser, under the supervision of the
Trust's Board of Trustees,  will also consider the continued  marketability of a
municipal lease  obligation based upon an analysis of the general credit quality
of  the  municipality  issuing  the  obligation  and  the  essentiality  to  the
municipality of the property covered by the lease.

         Currently, it is not the intention of the Portfolio to invest more than
25% of the value of its total assets in municipal  instruments whose issuers are
in the same state.

Standby Commitments

         The  Portfolio  may enter  into  standby  commitments  with  respect to
municipal instruments held by it. Under a standby commitment, a dealer agrees to
purchase at the Portfolio's  option a specified  Municipal  Instrument.  Standby
commitments  may be exercisable by the Portfolio at any time before the maturity
of the underlying municipal instruments and may be sold, transferred or assigned
only with the instruments involved.

         The  Portfolio  expects  that  standby  commitments  will  generally be
available without the payment of any direct or indirect consideration.  However,
if necessary or advisable, the Portfolio may pay for a standby commitment either
separately in cash or by paying a higher price for municipal  instruments  which
are  acquired  subject to the  commitment  (thus  reducing the yield to maturity
otherwise  available for the same  securities).  The total amount paid in either
manner for outstanding standby commitments held by the Portfolio will not exceed
1/2 of 1% of the value of the Portfolio's  total assets  calculated  immediately
after each standby commitment is acquired.

The Portfolio intends to enter into standby commitments only with dealers, banks
and  broker-dealers  which,  in Investment  Adviser's  opinion,  present minimal
credit  risks.  The  Portfolio  will  acquire  standby   commitments  solely  to
facilitate  portfolio  liquidity  and do not  intend to  exercise  their  rights
thereunder for trading  purposes.  The acquisition of a standby  commitment will
not affect the  valuation of the  underlying  Municipal  Instrument.  The actual
standby  commitment  will be valued  at zero in  determining  net  asset  value.
Accordingly,  where the  Portfolio  pays  directly or  indirectly  for a standby
commitment,  its cost will be  reflected  as an  unrealized  loss for the period
during which the  commitment  is held by the  Portfolio and will be reflected in
realized gain or loss when the commitment is exercised or expires.

Illiquid or Restricted Securities

         The Portfolio may invest up to 10% of its net assets in securities that
are illiquid.  Commercial  paper issued pursuant to Section 4(2) of the 1933 Act
and  securities  that are not  registered  under the 1933 Act but can be sold to
"qualified institutional buyers" in accordance with Rule 144A under the 1933 Act
will not be considered  illiquid so long as the Investment  Adviser  determines,
under  guidelines  approved by the Trust's  Board of Trustees,  that an adequate
trading  market  exists.  This practice  could increase the level of illiquidity
during any period that qualified  institutional  buyers become  uninterested  in
purchasing these securities.

Investment Restrictions

         The  Portfolio is subject to the  fundamental  investment  restrictions
enumerated  below  which  may be  changed  only  by a vote of the  holders  of a
majority of the Portfolio's outstanding shares.

The Portfolio may not:

           (1) Make loans,  except (a) through the purchase of debt  obligations
           in accordance with the Portfolio's investment objective and policies,
           (b) through repurchase  agreements with banks,  brokers,  dealers and
           other financial institutions, and (c) loans of securities.

           (2) Mortgage,  pledge or hypothecate  any assets (other than pursuant
           to  reverse   repurchase   agreements)  except  to  secure  permitted
           borrowings.

       (3)  Purchase  or sell real  estate or  securities  issued by real estate
       investment  trusts,  but this restriction shall not prevent the Portfolio
       from investing directly or indirectly in portfolio instruments secured by
       real estate or interests therein.

       (4) Purchase or sell commodities or commodity  contracts or oil or gas or
       other mineral exploration or development programs.

       (5)  Invest  in  companies  for the  purpose  of  exercising  control  or
management.

       (6) Act as  underwriter  of  securities  (except as the  Portfolio may be
       deemed  to  be an  underwriter  under  the  Securities  Act  of  1933  in
       connection  with  the  purchase  and  sale of  portfolio  instruments  in
       accordance  with  its  investment   objective  and  portfolio  management
       policies),  purchase securities on margin (except for delayed delivery or
       when-issued  transactions or such short-term credits as are necessary for
       the  clearance  of  transactions),  make  short  sales of  securities  or
       maintain a short position, or write puts, calls or combinations thereof.

       (7) Make any investment inconsistent with the Portfolio's  classification
       as a diversified investment company under the 1940 Act.

       (8) Purchase securities if such purchase would cause more than 25% in the
       aggregate of the market value of the total assets of the  Portfolio to be
       invested in the securities of one or more issuers having their  principal
       business  activities  in the same  industry,  provided  that  there is no
       limitation with respect to, and the Portfolio reserves freedom of action,
       when otherwise  consistent with its investment  policies,  to concentrate
       its  investments  in  obligations   issued  or  guaranteed  by  the  U.S.
       Government,  its agencies or  instrumentalities,  obligations (other than
       commercial paper) issued or guaranteed by U.S. banks and U.S. branches of
       foreign   banks  and   repurchase   agreements   and   securities   loans
       collateralized  by  such  U.S.   Government   obligations  or  such  bank
       obligations.  For the purposes of this  restriction,  state and municipal
       governments  and their  agencies  and  authorities  are not  deemed to be
       industries;  as to  utility  companies,  the  gas,  electric,  water  and
       telephone businesses are considered separate industries;  personal credit
       finance  companies and business credit finance companies are deemed to be
       separate industries; and wholly-owned finance companies are considered to
       be in the  industries of their parents if their  activities are primarily
       related to financing the activities of their parents.

       (9) Borrow money (other than  pursuant to reverse  repurchase  agreements
       for the Portfolio  described above),  except (a) as a temporary  measure,
       and then only in amounts not exceeding 5% of the value of the Portfolio's
       total assets or (b) from banks,  provided that immediately after any such
       borrowing all borrowings of the Portfolio do not exceed  one-third of the
       Portfolio's  total  assets.  No purchases of  securities  will be made if
       borrowings  subject  to this  restriction  exceed  5% of the value of the
       Portfolio's assets. The exceptions in (a) and (b) to this restriction are
       not for investment  leverage purposes but are solely for extraordinary or
       emergency  purposes or to facilitate  management of the Trust's Portfolio
       by enabling the Trust to meet redemption requests when the liquidation of
       portfolio instruments is deemed to be disadvantageous or not possible. If
       due to market  fluctuations  or other  reasons  the  total  assets of the
       Portfolio  fall below  300% of its  borrowings,  the Trust will  promptly
       reduce the borrowings of such Portfolio in accordance with the 1940 Act.

       (10)  Notwithstanding  any of the Trust's  other  fundamental  investment
       restrictions (including,  without limitation, those restrictions relating
       to issuer  diversification,  industry  concentration  and  control),  the
       Portfolio may (a) purchase  securities of other  investment  companies to
       the  full  extent  permitted  under  Section  12 of the  1940 Act (or any
       successor  provision  thereto)  or under any  regulation  or order of the
       Securities and Exchange  Commission;  and (b) invest all or substantially
       all of its  assets  in a single  open-end  investment  company  or series
       thereof with  substantially the same investment  objective,  policies and
       fundamental restrictions as the Portfolio.

                                         *     *     *

         The freedom of action  reserved in  Restriction  No. 8 with  respect to
U.S.  branches  of foreign  banks is subject  to the  requirement  that they are
subject to the same regulation as domestic  branches of U.S. banks.  Obligations
of U.S. branches of foreign banks may include certificates of deposit,  bank and
deposit notes,  bankers' acceptances and fixed time deposits.  These obligations
may be general  obligations  of the parent bank or may be limited to the issuing
branch.  Such  obligations  will meet the criteria for "Eligible  Securities" as
described in the Prospectus.

         In addition,  as a matter of fundamental  policy, the Portfolio may not
enter into reverse repurchase agreements exceeding in the aggregate one-third of
its total assets.

         Also,  as a matter  of  fundamental  policy,  changeable  only with the
approval  of  the  holders  of a  majority  of  the  outstanding  shares  of the
Portfolio,  at least 80% of the annual  gross  income of the  Portfolio  will be
derived from debt instruments,  the interest on which is, in the opinion of bond
counsel or counsel for issuers,  exempt from regular  Federal income tax, except
in extraordinary circumstances such as when the Investment Adviser believes that
market conditions indicate that the Portfolio should adopt a temporary defensive
posture by holding uninvested cash or investing in taxable securities.  Interest
earned by the Portfolio on "private  activity  bonds" that is treated as an item
of tax  preference  under Federal  alternative  minimum tax will be deemed to be
exempt from regular  Federal income tax for purposes of determining  whether the
Portfolio meets this fundamental policy.

         Securities  held in escrow or separate  accounts in connection with the
Portfolio's  investment  practices described in this Additional Statement and in
the  Prospectus  are not deemed to be  mortgaged,  pledged or  hypothecated  for
purposes of the foregoing Investment Restrictions.

         Except to the extent otherwise  provided in Investment  Restriction No.
8, for the purpose of such  restriction in determining  industry  classification
the Trust  intends to use the industry  classification  titles in the  Bloomberg
Industry Group Classifications.

         In applying  Restriction  No. 8 above,  a security is  considered to be
issued by the entity, or entities,  whose assets and revenues back the security.
A guarantee of a security is not deemed to be a security issued by the guarantor
when the value of all securities  issued and  guaranteed by the  guarantor,  and
owned by the  Portfolio,  does not  exceed  10% of the value of the  Portfolio's
total assets.

         Any  restriction  which  involves  a  maximum  percentage  will  not be
considered  violated  unless an excess over the  percentage  occurs  immediately
after,  and is caused by, an  acquisition or encumbrance of securities or assets
of, or borrowings by, the Portfolio.

         The Portfolio  intends,  as a non-fundamental  policy, to diversify its
investments  in  accordance  with current SEC  regulations.  Investments  in the
securities of any single issuer (excluding cash, cash items,  certain repurchase
agreements,  U.S.  Government  securities  and  securities  of other  investment
companies)  will be limited to not more than 5% of the value of the  Portfolio's
total assets at the time of purchase,  except that 25% of the value of the total
assets of the Portfolio may be invested in the  securities of any one issuer for
a period of up to three  Business  Days.  A security  that has an  unconditional
guarantee  meeting special SEC  requirements  (a  "Guarantee")  does not need to
satisfy the foregoing issuer  diversification  requirements that would otherwise
apply,  but the Guarantee is instead  subject to the  following  diversification
requirements:  immediately after the acquisition of the security,  the Portfolio
may not have invested more than 10% of its total assets in securities  issued by
or subject to Guarantees  from the same person,  except that the Portfolio  may,
subject  to  certain  conditions,  invest  up to  25%  of its  total  assets  in
securities  issued or subject to Guarantees of the same person.  This percentage
is 100% if the Guarantee is issued by the U.S.  Government or an agency thereof.
In  addition,  the  Portfolio  will limit its  investments  in  certain  conduit
securities  that are not rated in the  highest  short-term  rating  category  as
determined by two nationally  recognized  statistical rating organizations (each
an  "NRSRO")  (or one NRSRO if the  security  is rated by only one NRSRO) or, if
unrated,  are not of comparable  quality to First Tier Securities  ("Second Tier
Securities"), to 5% of its total assets, with investments in any one such issuer
being limited to no more than 1% of the Portfolio's  total assets or $1 million,
whichever  is greater,  measured  at the time of  purchase.  Conduit  securities
subject to this limitation are municipal  instruments  that are not subject to a
Guarantee and involve an arrangement whereunder a person, other than a municipal
issuer, provides for or secures repayment of the security and are not: (i) fully
and  unconditionally  guaranteed by a municipal issuer; or (ii) payable from the
general  revenues of the municipal issuer or other municipal  issuers;  or (iii)
related to a project owned and operated by a municipal  issuer;  or (iv) related
to a facility  leased to and under the control of an  industrial  or  commercial
enterprise  that is part of a public  project  which,  as a whole,  is owned and
under the control of a municipal issuer.

         In addition to the  foregoing,  the  Portfolio is subject to additional
diversification  requirements  imposed by SEC  regulations on the acquisition of
securities subject to other types of demand features.

                                       ADDITIONAL TRUST INFORMATION

TRUSTEES AND OFFICERS

         The  business  and affairs of the Trust and the  Portfolio  are managed
under the direction of the Trust's Board of Trustees.  Information pertaining to
the Trustees and officers of the Trust is set forth below.
<TABLE>
<CAPTION>
<S><C>                          <C>       <C>                          <C>

NAME                                      POSITION(S)                  PRINCIPAL OCCUPATION(S)
AND ADDRESS                      AGE       WITH TRUST                  DURING PAST 5 YEARS
- -----------                      ---       ----------                  -------------------

William H. Springer              69        Chairman                    Director of Walgreen  Co. (a retail
drug
701 Morningside Drive                      and                         store  business)  since April 1988;
Director
Lake Forest, IL 60045                      Trustee                     of   Baker,   Fentress   &  Co.  (a
closed-end,
                                                                       non-diversified          management
investment
                                                                       company)
                                                                       from
                                                                       April
                                                                       1992   to
                                                                       present;
                                                                       Trustee
                                                                       of
                                                                       Goldman
                                                                       Sachs
                                                                       Trust  (a
                                                                       registered
                                                                       investment
                                                                       company)
                                                                       from 1989
                                                                       to
                                                                       present.


<PAGE>


NAME                                      POSITION(S)                  PRINCIPAL OCCUPATION(S)
AND ADDRESS                      AGE       WITH TRUST                  DURING PAST 5 YEARS
- -----------                      ---       ----------                  -------------------

Richard Gordon Cline             64        Trustee                     Chairman and Director of Hussman
4200 Commerce Court,                                                   International   Inc.    (commercial
refrigeration
Suite 300                                                              company)    since   January   1998;
Chairman of
Lisle, IL 60532                                                        Hawthorne    Inc.   (a   management
advisory
                                                                       services  and  private   investment
company)
                                                                       since
                                                                       January
                                                                       1996;
                                                                       Chairman,
                                                                       President
                                                                       and   CEO
                                                                       of  NICOR
                                                                       Inc.   (a
                                                                       diversified
                                                                       public
                                                                       utility
                                                                       holding
                                                                       company)
                                                                       from 1985
                                                                       to  1996;
                                                                       Chairman
                                                                       and
                                                                       Director
                                                                       of    the
                                                                       Federal
                                                                       Reserve
                                                                       Bank   of
                                                                       Chicago
                                                                       from 1992
                                                                       to  1995;
                                                                       Director
                                                                       of
                                                                       Central
                                                                       DuPage
                                                                       Health
                                                                       System,
                                                                       Pet
                                                                       Incorporated
                                                                       (a
                                                                       commercial
                                                                       food
                                                                       company),
                                                                       Whitman
                                                                       Corporation
                                                                       (a
                                                                       diversified
                                                                       holding
                                                                       company),
                                                                       Kmart
                                                                       Corporation
                                                                       (a
                                                                       retailing
                                                                       company),
                                                                       Ryerson
                                                                       Tull,
                                                                       Inc.   (a
                                                                       metals
                                                                       distribution
                                                                       company)
                                                                       and
                                                                       University
                                                                       of
                                                                       Illinois
                                                                       Foundation.

Edward J. Condon, Jr.            58        Trustee                     Chairman and CEO of The Paradigm
Sears Tower, Suite 9650                                                Group,  Ltd. (a financial  adviser)
since July
233 S. Wacker Drive.                                                   1993;  within  the last five  years
                                     he has
Chicago, IL 60606                                                      served as Vice Chairman and
                                                                       Director of Energenics L.L.C. (a
                                                                       waste recycling company); Director
                                                                       of Financial Pacific Company (an
                                                                       equipment leasing company); Member
                                                                       of the Board of Managers of The
                                                                       Liberty Hampshire Company, LLC (a
                                                                       receivable securitization
                                                                       company), Member of Advisory Board
                                                                       of Real-Time U.S.A., Inc. (a
                                                                       software company); Member of the
                                                                       Board of Directors of University
                                                                       Elder Care, Inc.; Member of the
                                                                       Board of Directors of the Girl
                                                                       Scouts of Chicago; Member of the
                                                                       Board of Trustees of Dominican
                                                                       University.

John W. English                  66        Trustee                     Private  Investor since 1993;  Vice
President
50-H New England Ave.                                                  and  Chief  Investment  Officer  of
The Ford
P.O. Box 640                                                           Foundation (a charitable trust)
from 1981
Summit, NJ 07902-0640                                                  until 1993; Trustee of The China
Fund, Inc.
                                                                       (a
                                                                       registered
                                                                       investment
                                                                       company),
                                                                       American
                                                                       Red Cross
                                                                       in
                                                                       Greater
                                                                       New York,
                                                                       Mote
                                                                       Marine
                                                                       Laboratory
                                                                       (a
                                                                       non-profit
                                                                       marine
                                                                       research
                                                                       facility),
                                                                       State
                                                                       Street's
                                                                       Select
                                                                       Sector
                                                                       SPDR
                                                                       Trust  (a
                                                                       registered
                                                                       investment
                                                                       company),
                                                                       Washington
                                                                       Mutual's
                                                                       WM  Funds
                                                                       (a
                                                                       registered
                                                                       investment
                                                                       company)
                                                                       and
                                                                       United
                                                                       Board for
                                                                       Christian
                                                                       Higher
                                                                       Education
                                                                       in  Asia.
                                                                       Director
                                                                       of
                                                                       University
                                                                       of   Iowa
                                                                       Foundation,
                                                                       Blanton-Peale
                                                                       Institutes
                                                                       of
                                                                       Religion
                                                                       and
                                                                       Health,
                                                                       Community
                                                                       Foundation
                                                                       of
                                                                       Sarasota
                                                                       County,
                                                                       and  Duke
                                                                       Management
                                                                       Company
                                                                       (an
                                                                       investment
                                                                       adviser).

Sandra Polk Guthman              55        Trustee                     President and CEO of Polk Bros.
420 N. Wabash Avenue                                                   Foundation (an Illinois
not-for-profit
Suite 204                                                              corporation) from 1993 to present;
Director
Chicago, IL 60611                                                      of  Business   Transformation  from
1992-
                                                                       1993  and
                                                                       Midwestern
                                                                       Director
                                                                       of
                                                                       Marketing
                                                                       from
                                                                       1988-1992
                                                                       for   IBM
                                                                       (a
                                                                       technology
                                                                       company);
                                                                       Director
                                                                       of   MBIA
                                                                       Insurance
                                                                       Corporation
                                                                       of
                                                                       Illinois
                                                                       (bank
                                                                       holding
                                                                       company)
                                                                       since
                                                                       1994  and
                                                                       Avondale
                                                                       Financial
                                                                       Corporation
                                                                       (a  stock
                                                                       savings
                                                                       and  loan
                                                                       holding
                                                                       company)
                                                                       since
                                                                       1995.


<PAGE>


NAME                                      POSITION(S)                  PRINCIPAL OCCUPATION(S)
AND ADDRESS                      AGE       WITH TRUST                  DURING PAST 5 YEARS
- -----------                      ---       ----------                  -------------------

Frederick T. Kelsey             71         Trustee                     Consultant to Goldman Sachs (an
3133 Laughing Gull Court                                               investment       advisor) from
December 1985 Johns Island, SC 29455                                   through February 1988; Director of
                                                                       Goldman
                                                                       Sachs
                                                                       Funds
                                                                       Group  (a
                                                                       financial
                                                                       services
                                                                       provider)
                                                                       and  Vice
                                                                       President
                                                                       of
                                                                       Goldman
                                                                       Sachs
                                                                       from  May
                                                                       1981
                                                                       until his
                                                                       retirement
                                                                       in
                                                                       November
                                                                       1985;
                                                                       President
                                                                       and
                                                                       Treasurer
                                                                       of    the
                                                                       Trust and
                                                                       other
                                                                       investment
                                                                       companies
                                                                       affiliated
                                                                       with
                                                                       Goldman
                                                                       Sachs
                                                                       through
                                                                       August
                                                                       1985;
                                                                       President
                                                                       from 1983
                                                                       to   1985
                                                                       and
                                                                       Trustee
                                                                       from 1983
                                                                       to   1994
                                                                       of    The
                                                                       Centerland
                                                                       Funds and
                                                                       its
                                                                       successor,
                                                                       The Pilot
                                                                       Funds  (a
                                                                       registered
                                                                       investment
                                                                       company);
                                                                       Trustee
                                                                       of
                                                                       various
                                                                       management
                                                                       investment
                                                                       companies
                                                                       affiliated
                                                                       with
                                                                       Zurich
                                                                       Kemper
                                                                       Investments
                                                                       (an
                                                                       investment
                                                                       adviser).

Richard P. Strubel               59        Trustee                     Managing    Director    of   Tandem
Partners,
737 N. Michigan Avenue                                                 Inc. (a privately  held  management
services
Suite 1405                                                             firm)  since  1990;  President  and
CEO of
Chicago, IL 60611                                                      Microdot,        Inc. (a
privately held

                                                                       manufacturing
                                                                       firm)
                                                                       from
                                                                       January
                                                                       1984   to
                                                                       October
                                                                       1994;
                                                                       Trustee
                                                                       of
                                                                       Goldman
                                                                       Sachs
                                                                       Trust  (a
                                                                       registered
                                                                       investment
                                                                       company)
                                                                       from 1987
                                                                       to
                                                                       present;
                                                                       Director
                                                                       of Kaynar
                                                                       Technologies
                                                                       Inc.   (a
                                                                       leading
                                                                       manufacturer
                                                                       of
                                                                       aircraft
                                                                       fasteners)
                                                                       since
                                                                       March
                                                                       1997;
                                                                       Trustee
                                                                       of    the
                                                                       University
                                                                       of
                                                                       Chicago;
                                                                       Director
                                                                       of
                                                                       Children's
                                                                       Memorial
                                                                       Medical
                                                                       Center.

Jylanne M. Dunne                 39        President                   Senior    Vice     President    for
Distribution
4400 Computer Drive                                                    Services  at  First  Data  Investor
Services
Westborough, MA 01581                                                  Group, Inc. ("FDISG") (since 1988).

Richard H. Rose                  43        Vice                        Vice    President    and   Division
Manager of
4400 Computer Drive                        President                   Mutual   Fund   Administration   at
FDISG
Westborough, MA 01581                                                  (since    1994);     Senior    Vice
                                                                       President  at  The  Boston  Company
                                                                       Advisors,    Inc.   (a    financial
                                                                       services provider) (prior thereto).

Brian R. Curran                  31        Treasurer                   Director of Fund Administration and
4400 Computer Drive                                                    Accounting at FDISG (since 1997);
Westborough, MA 01581                                                  Director of Fund  Administration at
State
                                                                       Street
                                                                       Bank  and
                                                                       Trust
                                                                       Company
                                                                       (February
                                                                       1997   to
                                                                       October
                                                                       1997);
                                                                       Senior
                                                                       Auditor
                                                                       at  Price
                                                                       Waterhouse
                                                                       L.L.P.
                                                                       (February
                                                                       1994   to
                                                                       February
                                                                       1997);
                                                                       Manager
                                                                       of   Fund
                                                                       Accounting
                                                                       at  State
                                                                       Street
                                                                       Bank  and
                                                                       Trust
                                                                       Company
                                                                       (prior
                                                                       thereto).

Linda J. Hoard                   51        Secretary                   Counsel  at  FDISG  (since   1998);
Attorney
4400 Computer Drive                                                    Consultant for Fidelity
         Investments (an
Westborough, MA 01581                                                           investment       adviser),
                                                                       Investors  Bank & Trust  Company (a
                                                                       financial   service  provider)  and
                                                                       FDISG   (September   1994  to  June
                                                                       1998);     Vice    President    and
                                                                       Assistant  General  Counsel  at MFS
                                                                       Investment      Management      (an
                                                                       investment      adviser)     (prior
                                                                       thereto).

Teresa M.R. Hamlin               34        Assistant                   Counsel  at  FDISG  (since   1994);
Paralegal
4400 Computer Drive                        Secretary                   Manager  at  The   Boston   Company
Advisors, Westborough, MA 01581                                        Inc.   (an   investment    adviser)
(prior thereto).

Therese Hogan                    36        Assistant                   Director  of the  State  Regulation
Department
4400 Computer Drive                        Secretary                   at FDISG (since 1994); Senior Legal
Westborough, MA 01581                                                  Assistant at Palmer and Dodge (a

                                                                       Massachusetts
                                                                       law firm)
                                                                       (prior
                                                                       thereto).
</TABLE>

         None of the  Trustees  is an  "interested  person"  under the 1940 Act.
Certain of the Trustees and officers and the  organizations  with which they are
associated have had in the past, and may have in the future,  transactions  with
Northern,  FDISG,  First Data  Distributors,  Inc. ("FDDI" and collectively with
FDISG, "First Data") and their respective affiliates. The Trust has been advised
by such  Trustees  and  officers  that all such  transactions  have been and are
expected  to be in the  ordinary  course  of  business  and  the  terms  of such
transactions,  including all loans and loan  commitments  by such persons,  have
been and are expected to be  substantially  the same as the prevailing terms for
comparable transactions for other customers. As a result of the responsibilities
assumed by Northern under its Advisory  Agreement,  Transfer  Agency  Agreement,
Custodian Agreement,  and  Co-Administration  Agreement with the Trust, by FDISG
under its  Co-Administration  Agreement  with the  Trust  and by FDDI  under its
Distribution Agreement with the Trust, the Trust itself requires no employees.

         Each officer holds  comparable  positions with certain other investment
companies of which First Data or an affiliate thereof is the investment adviser,
administrator and/or distributor.

         Each Trustee  earns a quarterly  retainer of $6,750 and the Chairman of
the Board earns a quarterly  retainer of $10,125.  Each  Trustee,  including the
Chairman  of the  Board,  earns an  additional  fee of $2,500  for each  meeting
attended, plus reimbursement of expenses incurred as a Trustee.

         In addition,  the Trustees established an Audit Committee consisting of
three members including a Chairman of the Committee. The Audit Committee members
are Messrs.  Condon,  Kelsey and Strubel (Chairman).  Each member earns a fee of
$2,500 for each meeting attended and the Chairman earns a quarterly  retainer of
$1,500.

         Each Trustee will hold office for an indefinite term until the earliest
of (1) the next  meeting of  shareholders,  if any,  called  for the  purpose of
considering  the election or  re-election of such Trustee and until the election
and qualification of his or her successor,  if any, elected at such meeting; (2)
the date a Trustee  resigns or retires,  or a Trustee is removed by the Board of
Trustees  or  shareholders,   in  accordance  with  the  Trust's  Agreement  and
Declaration of Trust, or (3) in accordance  with the current  resolutions of the
Board of Trustees (which may be changed without  shareholder  vote), on the last
day of the  fiscal  year of the Trust in which he or she  attains  the age of 72
years.

         The Trust's officers do not receive fees from the Trust for services in
such capacities,  although FDISG, of which they are also officers, receives fees
from the Trust for administrative services.



<PAGE>


         The following table sets forth certain  information with respect to the
compensation of each Trustee of the Trust for the one-year period ended November
30, 1998:
<TABLE>
<CAPTION>
<S><C>                        <C>                   <C>                             <C>

                              Aggregate             Pension or Retirement           Total Compensation From
                              Compensation          Benefits Accrued as a Part of   Trust Paid
Name of Trustee               from the Trust        Trust's Expenses                to Trustees

William H. Springer           $46,750               N/A                             $46,750
Richard G. Cline              $34,000               N/A                             $34,000
Edward J. Condon, Jr.         $37,000               N/A                             $37,000
John W. English               $32,500               N/A                             $32,500
Sandra Polk Guthman           $34,000               N/A                             $34,000
Frederick T. Kelsey           $37,000               N/A                             $37,000
Richard P. Strubel            $42,250               N/A                             $42,250
</TABLE>

Investment Adviser, Transfer Agent and Custodian

Northern,  a  wholly-owned  subsidiary  of Northern  Trust  Corporation,  a bank
holding  company,  is  one  of the  nation's  leading  providers  of  trust  and
investment  management  services.  As of September  30,  1999,  Northern and its
affiliates  had over  $262.8  billion in assets  under  management  for  clients
including public and private retirement funds, endowments,  foundations, trusts,
corporations,  and  individuals.  Northern  is  one  of  the  strongest  banking
organizations  in  the  United  States.  Northern  believes  it  has  built  its
organization  by serving clients with  integrity,  a commitment to quality,  and
personal  attention.  Its  stated  mission  with  respect  to all its  financial
products and services is to achieve unrivaled client satisfaction.  With respect
to such clients,  the Trust is designed to assist (i) defined  contribution plan
sponsors and their employees by offering a range of diverse  investment  options
to help comply with 404(c) regulation and may also provide educational  material
to their  employees,  (ii)  employers  who  provide  post-retirement  Employees'
Beneficiary  Associations  ("VEBA") and require  investments that respond to the
impact of Federal  regulations,  (iii)  insurance  companies with the day-to-day
management of uninvested  cash balances as well as with  longer-term  investment
needs, and (iv) charitable and not-for-profit organizations,  such as endowments
and  foundations,  demanding  investment  management  solutions that balance the
requirement  for sufficient  current  income to meet operating  expenses and the
need for capital appreciation to meet future investment objectives.

     Northern  employs  a team  approach  to the  investment  management  of the
Portfolio,  relying upon investment  professionals under the leadership of James
M. Snyder, Chief Investment Officer and Executive Vice President of Northern.

         Under its Advisory Agreement with the Trust,  Northern,  subject to the
general supervision of the Trust's Board of Trustees,  is responsible for making
investment  decisions for the Portfolio and placing purchase and sale orders for
the  portfolio  transactions  of the  Portfolio.  In connection  with  portfolio
transactions for the Portfolio,  which are generally done at a net price without
a broker's  commission,  Northern's  Advisory  Agreement  provides that Northern
shall attempt to obtain the best net price and execution.

         Northern's  investment  advisory  duties for the Trust are  carried out
through its Trust  Department.  On occasions when Northern deems the purchase or
sale of a security to be in the best interests of the Portfolio as well as other
fiduciary  or agency  accounts  managed by it  (including  any other  portfolio,
investment  company  or  account  for  which  Northern  acts  as  adviser),  the
Investment Advisory Agreement provides that Northern, to the extent permitted by
applicable  laws and  regulations,  may aggregate  the  securities to be sold or
purchased  for the  Portfolio  with those to be sold or purchased for such other
accounts  in order to  obtain  best net  price  and  execution.  In such  event,
allocation  of the  securities  so  purchased  or sold,  as well as the expenses
incurred in the transaction, will be made by Northern in the manner it considers
to be most  equitable  and  consistent  with its  fiduciary  obligations  to the
Portfolio and other accounts  involved.  In some  instances,  this procedure may
adversely  affect the size of the position  obtainable  for the Portfolio or the
amount  of the  securities  that are able to be sold for the  Portfolio.  To the
extent  that the  execution  and price  available  from more than one  broker or
dealer are believed to be comparable,  the Investment Advisory Agreement permits
Northern,  at its  discretion  but  subject  to  applicable  law,  to select the
executing broker or dealer on the basis of Northern's opinion of the reliability
and quality of such broker or dealer.

         The  Advisory  Agreement  provides  that  Northern  may render  similar
services to others so long as its services under such Agreement are not impaired
thereby.  The Advisory  Agreement  also provides  that the Trust will  indemnify
Northern against certain  liabilities  (including  liabilities under the Federal
securities laws relating to untrue  statements or omissions of material fact and
actions  that are in  accordance  with the terms of the  Agreement)  or, in lieu
thereof, contribute to resulting losses.

         Under its  Transfer  Agency  Agreement  with the  Trust,  Northern  has
undertaken to (1) answer customer inquiries  regarding the current yield of, and
certain other matters  (e.g.  account  status  information)  pertaining  to, the
Trust, (2) process purchase and redemption transactions,  including transactions
generated by any service  provided  outside of the  Agreement  by Northern,  its
affiliates or  correspondent  banks whereby  customer  account cash balances are
automatically  invested in shares of the Portfolio,  and the disbursement of the
proceeds of redemptions,  (3) establish and maintain  separate  omnibus accounts
with respect to shareholders investing through Northern or any of its affiliates
and  correspondent  banks and act as transfer  agent and perform  sub-accounting
services  with respect to each such  account,  (4) provide  periodic  statements
showing account balances,  (5) mail reports and proxy materials to shareholders,
(6) provide  information  in  connection  with the  preparation  by the Trust of
various  regulatory  reports and prepare reports to the Trustees and management,
(7) answer  inquiries  (including  requests for  prospectuses  and statements of
additional  information,  and  assistance  in  the  completion  of  new  account
applications)  from  investors  and  respond  to all  requests  for  information
regarding the Trust (such as current price, recent performance,  and yield data)
and  questions  relating to accounts of  investors  (such as possible  errors in
statements, and transactions), (8) respond to and seek to resolve all complaints
of investors  with  respect to the Trust or their  accounts,  (9) furnish  proxy
statements  and  proxies,  annual  and  semi-annual  financial  statements,  and
dividend,  distribution and tax notices to investors, (10) furnish the Trust all
pertinent Blue Sky information,  (11) perform all required tax withholding, (12)
preserve  records,  and (13) furnish  necessary  office  space,  facilities  and
personnel.  Northern  may  appoint  one or  more  sub-  transfer  agents  in the
performance of its services.

         As  compensation  for the  services  rendered  by  Northern  under  the
Transfer  Agency  Agreement  with respect to Service  Shares and Premier  Shares
described in this Additional Statement and the assumption by Northern of related
expenses,  Northern is entitled  to a fee from the Trust,  calculated  daily and
payable  monthly,  at the following  annual rates: (i) .01% of the average daily
net asset value of the  outstanding  Service Shares of the  Portfolio;  and (ii)
 .02% of the average daily net asset value of the  outstanding  Premier Shares of
the Portfolio.  The transfer agency fee  attributable to each class of shares is
borne solely by that class.  Northern's  affiliates and correspondent  banks may
receive  compensation  for  performing  the services  described in the preceding
paragraph   that  Northern   would   otherwise   receive.   Conflict-of-interest
restrictions  under state and Federal law  (including  the  Employee  Retirement
Income  Security  Act of 1974) may apply to the  receipt by such  affiliates  or
correspondent  banks of such  compensation  in connection with the investment of
fiduciary funds in Service Shares and Premier Shares of the Portfolio.

         Under its Custodian  Agreement  with the Trust,  Northern (1) holds the
Portfolio's  cash and  securities,  (2)  maintains  such cash and  securities in
separate  accounts  in the  name  of  the  Portfolio,  (3)  makes  receipts  and
disbursements  of funds on behalf of the Portfolio,  (4) receives,  delivers and
releases  securities on behalf of the  Portfolio,  (5) collects and receives all
income,  principal and other payments in respect of the  Portfolio's  securities
held by Northern under the Custodian Agreement, and (6) maintains the accounting
records of the Trust.  Northern may employ one or more  subcustodians,  provided
that Northern,  subject to certain  monitoring  responsibilities,  shall have no
more  responsibility  or  liability  to the Trust on  account  of any  action or
omission of any subcustodian so employed than such  subcustodian has to Northern
and that the  responsibility  or liability of the subcustodian to Northern shall
conform  to  the  resolution  of  the  Trustees  of the  Trust  authorizing  the
appointment of the particular subcustodian.  Northern may also appoint agents to
carry out such of the provisions of the Custodian Agreement as Northern may from
time to time direct, provided that the appointment of an agent shall not relieve
Northern of any of its responsibilities under the Agreement.

         As compensation  for the services  rendered to the Trust by Northern as
custodian, and the assumption by Northern of certain related expenses,  Northern
is entitled to payment from the Trust as follows:  (i) $18,000  annually for the
Portfolio, plus (ii) 1/100th of 1% annually of the Portfolio's average daily net
assets to the extent they exceed $100 million, plus (iii) a fixed dollar fee for
each trade in portfolio  securities,  plus (iv) a fixed dollar fee for each time
that  Northern as  custodian  receives  or  transmits  funds via wire,  plus (v)
reimbursement  of expenses  incurred by Northern  as  custodian  for  telephone,
postage, courier fees, office supplies and duplicating.  The fees referred to in
clauses  (iii)  and (iv) are  subject  to  annual  upward  adjustments  based on
increases in the Consumer  Price Index for All Urban  Consumers,  provided  that
Northern may  permanently or temporarily  waive all or any portion of any upward
adjustment.

         Northern's fees under the Custodian  Agreement are subject to reduction
based on the Portfolio's daily uninvested cash balances (if any).

         Unless  sooner  terminated,  each of the Advisory  Agreement,  Transfer
Agency  Agreement and Custodian  Agreement  between  Northern and the Trust will
continue in effect with  respect to the  Portfolio  until  April 30,  2000,  and
thereafter for successive  12-month  periods,  provided that the  continuance is
approved at least annually (1) by the vote of a majority of the Trustees who are
not parties to the agreement or "interested persons" (as such term is defined in
the 1940 Act) of any party  thereto,  cast in person at a meeting called for the
purpose of voting on such  approval  and (2) by the Trustees or by the vote of a
majority of the  outstanding  shares of the  Portfolio  (as defined  below under
"Other  Information").  Each agreement is terminable at any time without penalty
by the Trust (by specified  Trustee or  shareholder  action) on 60 days' written
notice to Northern and by Northern on 60 days' written notice to the Trust.

         Banking laws and regulations  currently prohibit a bank holding company
registered  under the Federal  Bank  Holding  Company Act of 1956 or any bank or
non-bank   affiliate  thereof  from  sponsoring,   organizing,   controlling  or
distributing the shares of a registered open-end investment company continuously
engaged in the issuance of its shares,  but such banking laws and regulations do
not prohibit such a holding  company or affiliate or banks generally from acting
as  investment  adviser,  transfer  agent  or  custodian  to such an  investment
company,  or from purchasing  shares of such a company as agent for and upon the
order  of  customers.  Northern  believes  that  it  may  perform  the  services
contemplated by its agreements with the Trust without  violation of such banking
laws or  regulations,  which are applicable to it. It should be noted,  however,
that future changes in either Federal or state statutes and regulations relating
to the permissible activities of banks and their subsidiaries or affiliates,  as
well as future  judicial  or  administrative  decisions  or  interpretations  of
current  and future  statutes  and  regulations,  could  prevent  Northern  from
continuing to perform such services for the Trust.

         Should future legislative,  judicial or administrative  action prohibit
or restrict  the  activities  of Northern in  connection  with the  provision of
services on behalf of the Trust, the Trust might be required to alter materially
or  discontinue  its  arrangements  with  Northern  and  change  its  method  of
operations.  It is not  anticipated,  however,  that any  change in the  Trust's
method of operations would affect the net asset value per share of the Portfolio
or  result  in a  financial  loss  to  any  shareholder.  Moreover,  if  current
restrictions preventing a bank from legally sponsoring,  organizing, controlling
or distributing shares of an open-end investment company were relaxed, the Trust
expects that  Northern and its  affiliates  would  consider the  possibility  of
offering to perform some or all of the  services now provided by First Data.  It
is not possible, of course, to predict whether or in what form such restrictions
might be relaxed or the terms upon which Northern and its affiliates might offer
to provide services for consideration by the Trustees.

         Northern is active as an  underwriter of municipal  instruments.  Under
the 1940 Act, the Portfolio is precluded,  subject to certain  exceptions,  from
purchasing in the primary  market those  municipal  instruments  with respect to
which  Northern  is  serving  as a  principal  underwriter.  In the  opinion  of
Northern,  this  limitation  will not  significantly  affect the  ability of the
Portfolio to pursue its investment objective.

         Under a Service Mark License  Agreement with the Trust,  Northern Trust
Corporation has agreed that the name "Northern  Institutional Funds" may be used
in connection with the Trust's business on a royalty-free basis.  Northern Trust
Corporation has reserved to itself the right to grant the non-exclusive right to
use the name "Northern  Institutional  Funds" to any other person. The Agreement
provides  that at such time as the  Agreement is no longer in effect,  the Trust
will cease using the name "Northern Institutional Funds."

Portfolio Transactions

         To the extent that the Portfolio  effects  brokerage  transactions with
First Data or any  broker/dealer  affiliated  directly  or  indirectly  with the
Investment  Adviser,  such transactions,  including the frequency  thereof,  the
receipt of any commissions payable in connection therewith, and the selection of
the  affiliated  broker/dealer  effecting  such  transactions,  will be fair and
reasonable to the shareholders of the Portfolio.



Co-Administrators and Distributor

         Northern and FDISG,  4400 Computer  Drive,  Westborough,  Massachusetts
01581,  act as  co-administrators  for the Portfolio  under a  Co-Administration
Agreement  with the Trust.  Subject to the  general  supervision  of the Trust's
Board  of  Trustees,  Northern  and  FDISG  (the  "Co-Administrators")   provide
supervision of all aspects of the Trust's non-investment advisory operations and
perform various corporate secretarial, treasury and blue sky services, including
but not limited to: (a) maintaining  office facilities and furnishing  corporate
officers  for the Trust;  (b)  furnishing  data  processing  services,  clerical
services, and executive and administrative  services and standard stationery and
office supplies; (c) performing all functions ordinarily performed by the office
of a corporate treasurer,  and furnishing the services and facilities ordinarily
incident thereto,  such as expense accrual monitoring and payment of the Trust's
bills, preparing monthly reconciliation of the Trust's expense records, updating
projections of annual expenses,  preparing  materials for review by the Board of
Trustees and compliance  testing;  (d) preparing and  submitting  reports to the
Trust's   shareholders  and  the  SEC;  (e)  preparing  and  printing  financial
statements;  (f) preparing monthly Portfolio profile reports;  (g) preparing and
filing the Trust's  Federal and state tax returns  (other than those required to
be filed by the Trust's custodian and transfer agent) and providing  shareholder
tax  information  to the Trust's  transfer  agent;  (h)  assisting  in marketing
strategy   and  product   development;   (i)   performing   oversight/management
responsibilities,  such as the  supervision  and  coordination of certain of the
Trust's service  providers;  (j) effecting and maintaining,  as the case may be,
the  registration  of shares of the Trust for sale under the securities  laws of
various  jurisdictions;  (k) assisting in maintaining corporate records and good
standing  status of the Trust in its state of  organization;  and (l) monitoring
the Trust's  arrangements  with respect to services provided by Servicing Agents
to  their  customers  who are the  beneficial  owners  of  shares,  pursuant  to
servicing agreements between the Trust and such Servicing Agents.

         Subject to the limitations  described  below, as compensation for their
administrative   services  and  the   assumption   of  related   expenses,   the
Co-Administrators  are entitled to a fee from the Portfolio,  computed daily and
payable  monthly,  at an annual rate of .10% of the average  daily net assets of
the  Portfolio.  The  Co-Administrators  will  reimburse  the  Portfolio for its
expenses (including  administration fees payable to the  Co-Administrators,  but
excluding advisory fees, transfer agency fees,  servicing fees and extraordinary
expenses) which exceed on an annualized  basis .10% of the  Portfolio's  average
daily net assets.

         Unless sooner terminated, the Co-Administration Agreement will continue
in effect until April 30, 2001, and  thereafter  for  successive  one-year terms
with respect to the Portfolio,  provided that the agreement is approved annually
(1) by the Board of Trustees or (2) by the vote of a majority of the outstanding
shares of the Portfolio (as defined below under "Other  Information"),  provided
that in either  event the  continuance  is also  approved  by a majority  of the
Trustees who are not parties to the Agreement and who are not interested persons
(as defined in the 1940 Act) of any party  thereto,  by vote cast in person at a
meeting called for the purpose of voting on such approval. The Co-Administration
Agreement is terminable at any time after April 30, 2001, without penalty by the
Trust  on at  least  60  days  written  notice  to the  Co-Administrators.  Each
Co-Administrator may terminate the  Co-Administration  Agreement with respect to
itself at any time  after  April 30,  2001  without  penalty on at least 60 days
written notice to the Trust and the other Co-Administrator.

         The Trust may terminate the Co-Administration  Agreement prior to April
30, 2001 in the event that the Trust or its shareholders incur damages in excess
of $100,000 as a result of the willful  misfeasance,  bad faith or negligence of
the  Co-Administrators,  or the  reckless  disregard  of their  duties under the
Agreement. The Trust may also terminate the Co-Administration Agreement prior to
April 30, 2001 in the event that the  Co-Administrators  fail to meet one of the
performance standards set forth in the Agreement.

         The Trust has entered into a Distribution  Agreement  with FDDI,  under
which FDDI, as agent,  sells Service  Shares and Premier Shares of the Portfolio
on a  continuous  basis.  FDDI  pays  the  cost  of  printing  and  distributing
prospectuses  to  persons  who are not  shareholders  of the  Trust and of sales
presentations,  advertising and other distribution  efforts.  No compensation is
payable by the Trust to FDDI for such distribution services.

         The Co-Administration Agreement provides that the Co-Administrators may
render similar services to others so long as their services under such Agreement
are not impaired thereby. The Co-Administration Agreement also provides that the
Trust will  indemnify  each  Co-Administrator  against all claims  except  those
resulting  from  the  willful  misfeasance,  bad  faith  or  negligence  of such
Co-Administrator,  or the  Co-Administrator's  breach  of  confidentiality.  The
Distribution  Agreement  provides  that the Trust will  indemnify  FDDI  against
certain liabilities  relating to untrue statements or omissions of material fact
except those  resulting from the reliance on information  furnished to the Trust
by  FDDI,  or  those  resulting  from  the  willful  misfeasance,  bad  faith or
negligence of FDDI, or FDDI's breach of confidentiality.  FDDI is a wholly-owned
subsidiary  of  FDISG,  which  is  a  wholly-owned   subsidiary  of  First  Data
Corporation.

Counsel and Auditors

         Drinker Biddle & Reath LLP, with offices at One Logan Square,  18th and
Cherry Streets,  Philadelphia,  Pennsylvania 19103-6996, serve as counsel to the
Trust.

         Ernst & Young LLP, independent auditors,  233 S. Wacker Drive, Chicago,
Illinois  60606,  have been  selected as  auditors of the Trust.  In addition to
audit  services,  Ernst & Young LLP reviews  the  Trust's  Federal and state tax
returns,  and provides  consultation  and  assistance  on  accounting,  internal
control and related matters.

In-Kind Purchases and Redemptions

         Payment for Service  Shares and Premier Shares of the Portfolio may, in
the  discretion  of  Northern,  be  made  in the  form of  securities  that  are
permissible  investments for the Portfolio as described in the  Prospectus.  For
further information about this form of payment,  contact Northern. In connection
with an in-kind  securities  payment,  the Portfolio  will require,  among other
things,  that the securities be valued on the day of purchase in accordance with
the  pricing  methods  used by the  Portfolio  and  that the  Portfolio  receive
satisfactory  assurances  that it will  have  good and  marketable  title to the
securities received by it; that the securities be in proper form for transfer to
the Portfolio;  and that adequate  information be provided  concerning the basis
and other tax matters relating to the securities.

         Although the Portfolio generally will redeem Service Shares and Premier
Shares in cash,  it  reserves  the right to pay  redemptions  by a  distribution
in-kind of  securities  (instead  of cash) from the  Portfolio.  The  securities
distributed  in-kind  would be readily  marketable  and would be valued for this
purpose using the same method  employed in calculating the Portfolio's net asset
value per share. If a shareholder  receives  redemption  proceeds  in-kind,  the
shareholder should expect to incur transaction costs upon the disposition of the
securities received in the redemption.

Third-Party Fees and Requirements

         Service  Shares and Premier  Shares are sold and  redeemed  without any
purchase or redemption charge imposed by the Trust,  although Northern and other
institutions may charge their customers for services provided in connection with
their investments.

         The  exercise  of  voting  rights  and the  delivery  to  Customers  of
shareholder  communications  from the Trust will be governed  by the  Customers'
account  agreements with the Institutions.  Customers should read the Prospectus
in connection with any relevant agreement describing the services provided by an
Institution and any related requirements and charges, or contact the Institution
at which the Customer maintains its account for further information.

                                         PERFORMANCE INFORMATION

         The  performance  of a class of shares of the Portfolio may be compared
to those of other money  market  funds with similar  investment  objectives  and
other relevant indices or to rankings prepared by independent  services or other
financial or industry publications that monitor the performance of mutual funds.
For  example,  the  performance  of a class of shares  may be  compared  to data
prepared by IBC Financial Data, Inc. or other independent  mutual fund reporting
services.  Performance data as reported in national financial  publications such
as Money Magazine,  Morningstar,  Forbes,  Barron's, The Wall Street Journal and
The New York Times, or in publications of a local or regional  nature,  may also
be used in comparing the performance of a class of shares of the Portfolio.

From time to time, the Portfolio may advertise its "yield,"  "effective  yield,"
"tax-equivalent yield" and "tax-equivalent effective yield." These yield figures
will  fluctuate,  are  based on  historical  earnings  and are not  intended  to
indicate  future  performance.  "Yield"  refers  to the  net  investment  income
generated by an investment in the Portfolio over a seven-day  period  identified
in the advertisement.  This net investment income is then "annualized." That is,
the amount of net investment income generated by the investment during that week
is assumed  to be  generated  each week over a 52-week  period and is shown as a
percentage of the investment.

         In arriving at quotations as to "yield," the Trust first determines the
net change,  exclusive of capital  changes,  during the seven-day  period in the
value of a  hypothetical  pre-existing  account having a balance of one share at
the  beginning  of the period,  then divides such net change by the value of the
account at the  beginning  of the period to obtain the base period  return,  and
then multiplies the base period return by 365/7.

         "Effective yield" is calculated similarly but, when annualized, the net
investment  income  earned by an  investment  in the  Portfolio is assumed to be
reinvested.  The  "effective  yield"  will be  slightly  higher than the "yield"
because of the compounding effect of this assumed  reinvestment.  The "effective
yield" with  respect to the shares of the  Portfolio  is computed by adding 1 to
the base period return  (calculated as above),  raising the sum to a power equal
to 365 divided by 7, and subtracting 1 from the result.

         The  "tax-equivalent  yield"  demonstrates  the level of taxable  yield
necessary to produce an after-tax yield  equivalent to the Portfolio's  tax-free
yield. It is calculated by taking that portion of the seven-day "yield" which is
tax-exempt and adjusting it to reflect the tax savings  associated with a stated
tax rate.  The  "tax-equivalent  current  yield"  will always be higher than the
Portfolio's yield.

         "Tax-equivalent  yield" is computed by dividing the tax-exempt  portion
of the yield by 1 minus a stated income tax rate and then adding the quotient to
the  taxable  portion  of the  yield,  if  any.  There  may  be  more  than  one
tax-equivalent yield if more than one stated income tax rate is used.

         The "tax-equivalent  effective yield" demonstrates the level of taxable
yield  necessary to produce an after-tax  yield  equivalent  to the  Portfolio's
tax-free  effective  yield.  It is  calculated  by taking  that  portion  of the
seven-day  "effective yield" which is tax-exempt and adjusting it to reflect the
tax savings  associated  with a stated tax rate. The  "tax-equivalent  effective
yield" will always be higher than the Portfolio's effective yield.

         "Tax-equivalent effective yield" is computed by dividing the tax-exempt
portion of the  effective  yield by 1 minus a stated income  tax-rate,  and then
adding the quotient to the taxable portion of the effective yield, if any. There
may be more than one  tax-equivalent  effective  yield,  if more than one stated
income tax rate is used.

         Quotations of yield, effective yield,  tax-equivalent current yield and
tax-equivalent effective yield provided by the Trust are carried to at least the
nearest hundredth of one percent.  Any fees imposed by Northern,  its affiliates
or  correspondent  banks on their  customers in connection  with  investments in
shares of the Portfolio are not  reflected in the  calculation  of yields of the
Portfolio.

         The Portfolio's yields may not provide a basis for comparison with bank
deposits and other  investments  which provide a fixed yield for a stated period
of time.  The  Portfolio's  yields  fluctuate,  unlike  bank  deposits  or other
investments  which  pay  a  fixed  yield  for  a  stated  period  of  time.  The
annualization  of one  week's  income is not  necessarily  indicative  of future
actual yields. Actual yields will depend on such variables as portfolio quality,
average portfolio maturity, the type of portfolio instruments acquired,  changes
in money market interest rates, portfolio expenses and other factors. Yields are
one basis  investors may use to analyze the Portfolio as compared to other money
market  funds and other  investment  vehicles.  However,  yields of other  money
market funds and other investment  vehicles may not be comparable because of the
foregoing  variables,  and  differences  in the  methods  used in valuing  their
portfolio instruments, computing net asset value and determining yield.

         The  Portfolio  may also  quote  from time to time its total  return in
accordance with SEC regulations.

         The yields and total returns of the  Portfolio's  Shares are calculated
separately  from the  calculations  of the yield and total return of the Service
Shares and Premier Shares described in this Additional Statement.




                                         AMORTIZED COST VALUATION

         As stated in the  Prospectus,  the  Portfolio  seeks to  maintain a net
asset value of $1.00 per share and, in this  connection,  values its instruments
on the basis of amortized  cost  pursuant to Rule 2a-7 under the 1940 Act.  This
method  values a security  at its cost on the date of  purchase  and  thereafter
assumes  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  Portfolio  would  receive  if it sold the  instrument.
During such periods the yield to investors in the Portfolio may differ  somewhat
from that obtained in a similar  entity which uses  available  indications as to
market value to value its  portfolio  instruments.  For  example,  if the use of
amortized  cost  resulted in a lower  (higher)  aggregate  Portfolio  value on a
particular day, a prospective  investor in the Portfolio would be able to obtain
a somewhat  higher  (lower) yield and ownership  interest than would result from
investment  in such similar  entity and existing  investors  would  receive less
(more) investment income and ownership interest. However, the Trust expects that
the procedures and limitations  referred to in the following  paragraphs of this
section will tend to minimize the differences referred to above.

         Under Rule 2a-7,  the Trust's  Board of Trustees,  in  supervising  the
Trust's operations and delegating special  responsibilities  involving portfolio
management to Northern,  has established  procedures  that are intended,  taking
into account current market conditions and the Portfolio's investment objective,
to stabilize the net asset value of the Portfolio,  as computed for the purposes
of purchases  and  redemptions,  at $1.00 per share.  The  Trustees'  procedures
include  periodic  monitoring of the difference (the "Market Value  Difference")
between  the  amortized  cost value per share and the net asset  value per share
based upon  available  indications  of market value.  Available  indications  of
market  value  used  by  the  Trust  consist  of  actual  market  quotations  or
appropriate  substitutes which reflect current market conditions and include (a)
quotations  or estimates of market value for  individual  portfolio  instruments
and/or (b) values for  individual  portfolio  instruments  derived  from  market
quotations   relating  to  varying   maturities  of  a  class  of  money  market
instruments.  In the event the Market Value Difference of the Portfolio  exceeds
certain limits or Northern  believes that the Market Value Difference may result
in  material   dilution  or  other  unfair  results  to  investors  or  existing
shareholders, the Trust will take action in accordance with the 1940 Act and the
Trustees  will take  such  steps as they  consider  appropriate  (e.g.,  selling
portfolio  instruments  to  shorten  average  portfolio  maturity  or to realize
capital gains or losses,  reducing or suspending  shareholder  income  accruals,
redeeming  shares  in-kind or  utilizing  a net asset value per share based upon
available  indications of market value which under such circumstances would vary
from $1.00) to  eliminate  or reduce to the extent  reasonably  practicable  any
material dilution or other unfair results to investors or existing  shareholders
which might arise from Market Value Differences.  In particular,  if losses were
sustained by the Portfolio, the number of outstanding shares might be reduced in
order to maintain a net asset value per share of $1.00.  Such reduction would be
effected  by  having  each   shareholder   proportionately   contribute  to  the
Portfolio's  capital the  necessary  shares to restore  such net asset value per
share.  Each shareholder  will be deemed to have agreed to such  contribution in
these circumstances by investing in the Portfolio.

         Rule  2a-7  requires  that  the  Portfolio  limit  its  investments  to
instruments which Northern determines (pursuant to guidelines established by the
Board of  Trustees)  to present  minimal  credit  risks and which are  "Eligible
Securities" as defined by the SEC and described in the Prospectus. The Rule also
requires  that  the  Portfolio  maintain  a  dollar-weighted  average  portfolio
maturity  (not more than 90 days)  appropriate  to its policy of  maintaining  a
stable net asset value per share and  precludes  the purchase of any  instrument
deemed  under the Rule to have a remaining  maturity  of more than 397  calendar
days. Should the disposition of a portfolio security result in a dollar-weighted
average portfolio maturity of more than 90 days, the Rule requires the Portfolio
to invest its available  cash in such a manner as to reduce such maturity to the
prescribed limit as soon as reasonably practicable.

                             DESCRIPTION OF SERVICE SHARES AND PREMIER SHARES

         The Trust  Agreement  permits the Trust's Board of Trustees to issue an
unlimited number of full and fractional shares of beneficial  interest of one or
more  separate  series   representing   interests  in  one  or  more  investment
portfolios.  The Trustees may hereafter create series in addition to the Trust's
nineteen  existing  series,  which represent  interests in the Trust's  nineteen
respective portfolios. The Trust Agreement also permits the Board of Trustees to
classify  or  reclassify  any  unissued  shares  into  classes  within a series.
Pursuant to such  authority,  the Trustees  have  authorized  the issuance of an
unlimited  number of shares of beneficial  interest in three separate classes of
shares of the  Portfolio:  Shares,  Service  Shares  and  Premier  Shares.  This
Additional  Statement (and the related  Prospectus)  relates only to the Service
Shares and Premier Shares of the Portfolio  discussed herein. For information on
the other share classes in the  Portfolio  and on the Trust's  other  investment
portfolios, call the toll-free number on page 1.

         Under the terms of the Trust Agreement,  each share of the Portfolio is
without par value,  represents an equal proportionate  interest in the Portfolio
with each other  share of its class in the  Portfolio  and is  entitled  to such
dividends and  distributions out of the income belonging to the Portfolio as are
declared by the Trustees. Upon the liquidation of the Portfolio, shareholders of
each class of the  Portfolio  are  entitled  to share pro rata in the net assets
belonging  to that  class  available  for  distribution.  Shares do not have any
preemptive or  conversion  rights.  The right of  redemption is described  under
"About Your Account - Selling Shares and Account Policies and Other Information"
in the  Prospectus  and under  "Amortized  Cost  Valuation"  in this  Additional
Statement.  In  addition,  pursuant to the terms of the 1940 Act, the right of a
shareholder  to redeem  shares and the date of payment by the  Portfolio  may be
suspended  for more than seven days (a) for any period during which the New York
Stock  Exchange is closed,  other than the  customary  weekends or holidays,  or
trading  in  the  markets  the  Portfolio  normally  utilizes  is  closed  or is
restricted as determined by the SEC, (b) during any emergency,  as determined by
the SEC, as a result of which it is not reasonably practicable for the Portfolio
to dispose of  instruments  owned by it or fairly to determine  the value of its
net assets,  or (c) for such other period as the SEC may by order permit for the
protection of the  shareholders of the Portfolio.  The Trust may also suspend or
postpone the  recordation  of the transfer of its shares upon the  occurrence of
any of the  foregoing  conditions.  In  addition,  shares of the  Portfolio  are
redeemable at the  unilateral  option of the Trust if the Trustees  determine in
their  sole  discretion  that  failure to so redeem  may have  material  adverse
consequences to the  shareholders  of the Portfolio.  Service Shares and Premier
Shares when issued as described in the Prospectus are validly issued, fully paid
and  nonassessable,  except as stated  below.  In the  interests  of economy and
convenience,  certificates representing Service Shares and Premier Shares of the
Portfolio are not issued.

         The proceeds  received by the  Portfolio  for each issue or sale of its
shares, and all net investment income, realized and unrealized gain and proceeds
thereof, subject only to the rights of creditors, will be specifically allocated
to and constitute the underlying assets of that Portfolio. The underlying assets
of the Portfolio will be segregated on the books of account, and will be charged
with the liabilities  and with a share of the general  liabilities of the Trust.
Expenses with respect to the  Portfolio are normally  allocated in proportion to
the net asset value of the Portfolio except where allocations of direct expenses
can otherwise be fairly made.

         Rule 18f-2 under the 1940 Act provides  that any matter  required to be
submitted to the holders of the outstanding  voting  securities of an investment
company  such as the Trust  shall not be deemed to have been  effectively  acted
upon unless approved by the holders of a majority of the  outstanding  shares of
the Portfolio,  if it is affected by the matter.  The Portfolio is affected by a
matter  unless it is clear that the interests of the Portfolio in the matter are
substantially  identical as the other  investment  portfolios or that the matter
does not affect any interest of the  Portfolio.  Under the Rule, the approval of
an  investment  advisory  agreement  or any change in a  fundamental  investment
policy would be  effectively  acted upon with respect to the  Portfolio  only if
approved by a majority of the outstanding shares of the Portfolio.  However, the
Rule also provides  that the  ratification  of the  appointment  of  independent
accountants,  the approval of principal  underwriting contracts and the election
of Trustees are exempt from the separate  voting  requirements  stated above. In
addition, shareholders of each of the classes in the Portfolio have equal voting
rights except that only shares of a particular  class of the  Portfolio  will be
entitled  to vote  on  matters  submitted  to a vote of  shareholders  (if  any)
relating to  shareholder  servicing  expenses and transfer  agency fees that are
payable by that class.

         The Trust is not required to hold annual meetings of  shareholders  and
does  not  intend  to  hold  such  meetings.  In the  event  that a  meeting  of
shareholders is held, each share of the Trust will be entitled, as determined by
the Trustees without the vote or consent of shareholders, either to one vote for
each share or to one vote for each dollar of net asset value represented by such
shares on all matters  presented  to  shareholders,  including  the  election of
Trustees  (this method of voting being  referred to as  "dollar-based  voting").
However,  to the extent required by the 1940 Act or otherwise  determined by the
Trustees,  series and classes of the Trust will vote separately from each other.
Shareholders of the Trust do not have  cumulative  voting rights in the election
of Trustees  and,  accordingly,  the  holders of more than 50% of the  aggregate
voting power of the Trust may elect all of the Trustees irrespective of the vote
of the other shareholders.  Meetings of shareholders of the Trust, or any series
or class thereof,  may be called by the Trustees,  certain  officers or upon the
written request of holders of 10% or more of the shares entitled to vote at such
meeting. The shareholders of the Trust will have voting rights only with respect
to the limited number of matters specified in the Trust Agreement and such other
matters as the Trustees may  determine or may be required by law. The Trust does
not presently intend to hold annual meetings of shareholders  except as required
by the 1940 Act or other  applicable  law. The  Trustees  will  promptly  call a
meeting  of  shareholders  to vote  upon  the  removal  of any  Trustee  when so
requested  in writing by the  record  holders of 10% or more of the  outstanding
shares.  To the extent  required by law,  the Trust will  assist in  shareholder
communications in connection with such a meeting.

         The  Trust  Agreement  authorizes  the  Trustees,  without  shareholder
approval  (except as stated in the next  paragraph),  to cause the Trust, or any
series thereof, to merge or consolidate with any corporation, association, trust
or  other  organization  or sell or  exchange  all or  substantially  all of the
property  belonging  to the  Trust,  or any series  thereof.  In  addition,  the
Trustees, without shareholder approval, may adopt a "master-feeder" structure by
investing  substantially  all of the  assets  of a  series  of the  Trust in the
securities of another open-end investment company or pooled portfolio.

         The Trust  Agreement also  authorizes the Trustees,  in connection with
the merger,  consolidation,  termination or other reorganization of the Trust or
any series or class, to classify the  shareholders of any class into one or more
separate groups and to provide for the different treatment of shares held by the
different groups, provided that such merger, consolidation, termination or other
reorganization  is approved by a majority of the outstanding  voting  securities
(as  defined  in the  1940  Act) of  each  group  of  shareholders  that  are so
classified.

         The Trust  Agreement  permits the Trustees to amend the Trust Agreement
without a shareholder vote. However, shareholders of the Trust have the right to
vote on any  amendment:  (i) that would  adversely  affect the voting  rights of
shareholders; (ii) that is required by law to be approved by shareholders; (iii)
that would amend the voting provisions of the Trust Agreement;  or (iv) that the
Trustees determine to submit to shareholders.

         The Trust  Agreement  permits  the  termination  of the Trust or of any
series or class of the Trust (i) by a majority of the affected shareholders at a
meeting of shareholders of the Trust,  series or class; or (ii) by a majority of
the Trustees without  shareholder  approval if the Trustees  determine that such
action is in the best interest of the Trust or its shareholders. The factors and
events that the  Trustees  may take into  account in making  such  determination
include (i) the  inability  of the Trust or any series or class to maintain  its
assets at an appropriate size; (ii) changes in laws or regulations governing the
Trust or any series or class thereof,  or affecting  assets of the type in which
it  invests;  or (iii)  economic  developments  or trends  having a  significant
adverse impact on their business or operations.

         Under  the  Delaware   Business   Trust  Act  (the   "Delaware   Act"),
shareholders  are not  personally  liable  for  obligations  of the  Trust.  The
Delaware  Act  entitles  shareholders  of the  Trust to the same  limitation  of
liability as is available to  shareholders of private  for-profit  corporations.
However,  no  similar  statutory  or other  authority  limiting  business  trust
shareholder  liability exists in many other states.  As a result,  to the extent
that the Trust or a shareholder is subject to the jurisdiction of courts in such
other  states,  those  courts may not apply  Delaware  law and may  subject  the
shareholders to liability. To offset this risk, the Trust Agreement (i) contains
an express  disclaimer of  shareholder  liability for acts or obligations of the
Trust and requires that notice of such  disclaimer  be given in each  agreement,
obligation and instrument  entered into or executed by the Trust or its Trustees
and (ii)  provides for  indemnification  out of the  property of the  applicable
series  of  the  Trust  of  any  shareholder  held  personally  liable  for  the
obligations  of the Trust solely by reason of being or having been a shareholder
and not because of the shareholder's acts or omissions or for some other reason.
Thus,  the risk of a  shareholder  incurring  financial  loss  beyond his or her
investment because of shareholder liability is limited to circumstances in which
all of the following factors are present:  (1) a court refuses to apply Delaware
law;  (2) the  liability  arises  under  tort  law or,  if not,  no  contractual
limitation of liability is in effect; and (3) the applicable series of the Trust
is unable to meet its obligations.

         The Trust  Agreement  provides  that the Trustees will not be liable to
any person other than the Trust or a shareholder  and that a Trustee will not be
liable  for  any act as a  Trustee.  However,  nothing  in the  Trust  Agreement
protects a Trustee  against any liability to which he or she would  otherwise be
subject  by reason of  willful  misfeasance,  bad  faith,  gross  negligence  or
reckless disregard of the duties involved in the conduct of his or her office.

         The Trust Agreement provides for indemnification of Trustees,  officers
and  agents of the Trust  unless  the  recipient  is liable by reason of willful
misfeasance,  bad faith,  gross  negligence or reckless  disregard of the duties
involved in the conduct of such person's  office.  The Trust Agreement  provides
that  each  shareholder,  by  virtue  of  becoming  such,  will  be held to have
expressly  assented and agreed to the terms of the Trust  Agreement  and to have
become a party thereto.

         In addition to the  requirements  of Delaware law, the Trust  Agreement
provides that a shareholder of the Trust may bring a derivative action on behalf
of the Trust only if the following conditions are met: (a) shareholders eligible
to bring such derivative  action under Delaware law who hold at least 10% of the
outstanding  shares of the Trust, or 10% of the outstanding shares of the series
or class to which such action relates, must join in the request for the Trustees
to commence  such  action;  and (b) the  Trustees  must be afforded a reasonable
amount of time to consider such shareholder request and to investigate the basis
of such claim. The Trust Agreement also provides that no person,  other than the
Trustees,  who is not a  shareholder  of a  particular  series or class shall be
entitled to bring any derivative  action,  suit or other proceeding on behalf of
or with respect to such series or class. The Trustees will be entitled to retain
counsel or other  advisers  in  considering  the merits of the  request  and may
require an undertaking by the shareholders  making such request to reimburse the
Trust  for the  expense  of any such  advisers  in the event  that the  Trustees
determine not to bring such action.

         The Trustees may appoint separate  Trustees with respect to one or more
series or classes of the Trust's shares (the "Series  Trustees").  To the extent
provided by the Trustees in the appointment of Series Trustees,  Series Trustees
(a) may,  but are not  required  to, serve as Trustees of the Trust or any other
series  or class of the  Trust;  (b) may  have,  to the  exclusion  of any other
Trustee of the Trust, all the powers and authorities of Trustees under the Trust
Agreement with respect to such series or class;  and/or (c) may have no power or
authority  with  respect  to any other  series or class.  The  Trustees  are not
currently considering the appointment of Series Trustees for the Trust.

         As of July  30,  1999,  substantially  all of the  Trust's  portfolios'
outstanding  shares  were held of  record by  Northern  for the  benefit  of its
customers and the customers of its affiliates and correspondent  banks that have
invested in the  portfolios.  As of the same date,  Northern  possessed  sole or
shared voting and/or  investment power for its customer accounts with respect to
less  than 10% of the  Trust's  outstanding  shares.  As of the same  date,  the
Trust's Trustees and officers as a group owned  beneficially less than 1% of the
outstanding shares of each class of each portfolio.

                                 ADDITIONAL INFORMATION CONCERNING TAXES

General

         The  Portfolio  will  elect  to  be  taxed  separately  as a  regulated
investment company (a "RIC"). To qualify as a RIC, the Portfolio  generally must
distribute an amount equal to at least the sum of 90% of its investment  company
taxable income and 90% of its net tax-exempt interest income (net income and the
excess of net short-term  capital gain over net long-term capital loss), if any,
for each  year  (the  "Distribution  Requirement")  and  satisfy  certain  other
requirements.

         The  Portfolio  must  derive  at least  90% of its  gross  income  from
dividends, interest, certain payments with respect to securities loans and gains
from the sale or other disposition of stock or securities or foreign currencies,
or from other  income  derived with respect to its business of investing in such
stock,  securities  or  currencies.  Also,  at the close of each  quarter of the
taxable  year,  it is generally  required  that at least 50% of the value of the
Portfolio's  assets  must  consist  of cash  and  cash  items,  U.S.  Government
securities,  securities  of other RICs and  securities  of other  issuers (as to
which  the  Portfolio  has not  invested  more than 5% of the value of its total
assets in securities of such issuer and as to which the Portfolio  does not hold
more than 10% of the outstanding voting securities of such issuer),  and no more
than 25% of the value of the  Portfolio's  total  assets may be  invested in the
securities  of any  one  issuer  (other  than  U.S.  Government  securities  and
securities  of other  RICs),  or in two or more  issuers  which  such  Portfolio
controls and which are engaged in the same or similar trades or businesses.  The
Portfolio intends to comply with these RIC requirements.

         If for any taxable year the  Portfolio was not to qualify as a RIC, all
of its taxable income would be subject to tax at regular corporate rates without
any  deduction  for   distributions   to   shareholders.   In  such  event,  all
distributions  by the  Portfolio  would be taxable to  shareholders  as ordinary
income to the extent of the  Portfolio's  current and  accumulated  earnings and
profits, and would be eligible for the dividends-received  deduction in the case
of corporate shareholders.

         The Internal Revenue Code imposes a nondeductible 4% excise tax on RICs
that fail  currently to distribute an amount equal to specified  percentages  of
their  ordinary  taxable  income and capital gain net income  (excess of capital
gains  over  capital   losses).   The  Portfolio   intends  to  make  sufficient
distributions or deemed distributions of its ordinary taxable income and capital
gain net income each calendar  year to avoid  liability for this excise tax. The
Portfolio also intends to make sufficient  distributions or deemed distributions
each year to avoid liability for corporate  income tax. If the Portfolio were to
fail to make sufficient  distributions,  it could be liable for corporate income
tax and for excise tax.

         The Trust will be  required in certain  cases to withhold  and remit to
the U.S.  Treasury 31% of taxable  dividends and gross sale proceeds paid to any
shareholder (i) who has provided either an incorrect tax  identification  number
or no number at all, (ii) who is subject to backup  withholding  by the Internal
Revenue  Service  for  failure to report the  receipt  of  taxable  interest  or
dividend income properly,  or (iii) who has failed to certify to the Trust, when
required to do so, that he or she is not subject to backup  withholding  or that
he or she is an "exempt recipient."

Special Tax Considerations

         As described in the  Prospectus,  the  Portfolio is designed to provide
investors  with  Federally  tax-exempt  interest  income.  The  Portfolio is not
intended to  constitute  a balanced  investment  program and is not designed for
investors seeking capital appreciation or maximum tax-exempt income irrespective
of fluctuations in principal.  Shares of the Portfolio would not be suitable for
tax-exempt  institutions or for retirement  plans qualified under Section 401 of
the Code, H.R. 10 plans and individual  retirement  accounts  because such plans
and  accounts  are  generally  tax-exempt  and,  therefore,  would  not gain any
additional benefit from the Portfolio's dividends being tax-exempt. In addition,
the Portfolio may not be an appropriate  investment for persons or entities that
are  "substantial  users" of facilities  financed by private  activity  bonds or
"related  persons"  thereof.  "Substantial  user" is defined under U.S. Treasury
Regulations to include a non-exempt  person which  regularly uses a part of such
facilities  in its trade or  business  and whose  gross  revenues  derived  with
respect to the facilities  financed by the issuance of bonds are more than 5% of
the total revenues derived by all users of such facilities,  which occupies more
than 5% of the usable area of such  facilities or for which such facilities or a
part thereof were specifically constructed,  reconstructed or acquired. "Related
persons" include certain related natural  persons,  affiliated  corporations,  a
partnership and its partners and an S corporation and its shareholders.

         In order for the  Portfolio  to pay Federal  exempt-interest  dividends
with respect to any taxable year, at the close of each taxable  quarter at least
50% of  the  aggregate  value  of  the  Portfolio  must  consist  of  tax-exempt
obligations.  An exempt-interest dividend is any dividend or part thereof (other
than a  capital  gain  dividend)  paid by the  Portfolio  and  designated  as an
exempt-interest  dividend in a written notice mailed to  shareholders  not later
than 60 days  after the close of the  Portfolio's  taxable  year.  However,  the
aggregate  amount of dividends so designated by the Portfolio  cannot exceed the
excess of the amount of interest  exempt from tax under  Section 103 of the Code
received by the Portfolio during the taxable year over any amounts disallowed as
deductions under Sections 265 and 171(a)(2) of the Code. The percentage of total
dividends paid by the Portfolio with respect to any taxable year which qualifies
as  Federal  exempt-interest  dividends  will be the same  for all  shareholders
receiving dividends from the Portfolio with respect to such year.

         Interest on indebtedness incurred by a shareholder to purchase or carry
shares of the  Portfolio  generally  is not  deductible  for Federal  income tax
purposes  to  the  extent  attributable  to   exempt-interest-dividends.   If  a
shareholder  holds Portfolio shares for six months or less, any loss on the sale
or exchange of those  shares will be  disallowed  to the extent of the amount of
exempt-interest  dividends  earned  with  respect to the  shares.  The  Treasury
Department,  however, is authorized to issue regulations  reducing the six-month
holding  requirement  to a period of not less than the greater of 31 days or the
period between  regular  distributions  for investment  companies that regularly
distribute at least 90% of its net tax-exempt interest.  No such regulations had
been issued as of the date of this Additional Statement.

         Corporate   taxpayers  will  be  required  to  take  into  account  all
exempt-interest  dividends from the Portfolio in determining certain adjustments
for alternative minimum tax purposes.

         The  Portfolio  will  determine  annually  the  percentages  of its net
investment  income  which is exempt from tax,  which  constitute  an item of tax
preference  for  purposes of the Federal  alternative  minimum tax, and which is
fully  taxable,  and will apply these  percentages  uniformly  to all  dividends
declared from net  investment  income during that year.  These  percentages  may
differ significantly from the actual percentages for any particular day.

         Shareholders  will be advised  annually  as to the  Federal  income tax
consequences of distributions made by the Portfolios.

Foreign Investors

         Foreign shareholders  generally will be subject to U.S. withholding tax
at a rate of 30% (or a lower treaty rate, if applicable) on distributions by the
Portfolio of net investment  income,  other ordinary income,  and the excess, if
any, of net  short-term  capital  gain over net  long-term  capital loss for the
year,  regardless of the extent,  if any, to which the income or gain is derived
from  non-U.S.   investments  of  the  Portfolio.   For  this  purpose,  foreign
shareholders include individuals other than U.S. citizens, residents and certain
nonresident aliens, and foreign corporations,  partnerships, trusts and estates.
Different tax consequences may apply to a foreign  shareholder engaged in a U.S.
trade or business or present in the U.S. for 183 days or more in a year. Foreign
shareholders  should  consult their tax advisers  regarding the U.S. and foreign
tax consequences of investing in the Portfolio.

Conclusion

         The foregoing  discussion is based on Federal tax laws and  regulations
which  are in  effect on the date of this  Additional  Statement.  Such laws and
regulations may be changed by legislative or  administrative  action. No attempt
is made to present a detailed  explanation of the tax treatment of the Portfolio
or its  shareholders,  and the  discussion  here  and in the  Prospectus  is not
intended as a substitute for careful tax planning.  Shareholders  are advised to
consult their tax advisers with specific  reference to their own tax  situation,
including the application of state and local taxes.

         Although the  Portfolio  expects to qualify as a RIC and to be relieved
of all or  substantially  all Federal  taxes,  depending  upon the extent of its
activities  in states and  localities  in which its offices are  maintained,  in
which its  agents  or  independent  contractors  are  located  or in which it is
otherwise deemed to be conducting business,  the Portfolio may be subject to the
tax laws of such states or localities.

SERVICE PLAN

         The Trust, on behalf of the Portfolio,  has adopted a Service Plan (the
"Plan") with respect to the Service Shares and Premier  Shares.  Under the Plan,
the  Trust,  on behalf  of the  Service  Shares  and the  Premier  Shares of the
Portfolio,  is authorized to pay to Northern a monthly or quarterly  service fee
in  respect  of (i)  administrative  support  services  performed  and  expenses
incurred in connection  with the  Portfolio's  Service Shares and Premier Shares
and (ii)  personal  and account  maintenance  services  performed  and  expenses
incurred in connection with the  Portfolio's  Premier Shares as set forth below.
The fee paid for such services (the "Service Fee") during any one year shall not
exceed:  (i) .33% of the average daily net asset value of the Service  Shares of
the  Portfolio and (ii) .58% of the average daily net asset value of the Premier
Shares of the Portfolio during such period; provided, however, that the fee paid
for personal and account maintenance services and expenses shall not exceed .25%
of the average daily net asset value of the Premier  Shares of the Portfolio for
such period. Northern will determine the amount of the Service Fee to be paid to
one or more brokers,  dealers,  other  financial  institutions or other industry
professionals  (collectively,  "Servicing  Agents")  and the basis on which such
payments  will be  made.  Payments  to a  Servicing  Agent  will be  subject  to
compliance by the Servicing  Agent with the terms of the related Plan  agreement
entered into by the Servicing  Agent.  The Service Fees payable pursuant to this
Plan shall not pertain to services or expenses  which are primarily  intended to
result in the sales of Service Shares and Premier Shares.

         Payments of the Service Fee with respect to Service  Shares and Premier
Shares will be used to compensate or reimburse Northern and the Servicing Agents
for  administrative  support  services and expenses,  which may include  without
limitation:  (i) acting or arranging for another  party to act, as  recordholder
and nominee of Service Shares and Premier  Shares of the Portfolio  beneficially
owned by Customers;  (ii) establishing and maintaining  individual  accounts and
records with respect to Service Shares and Premier Shares of the Portfolio owned
by Customers;  (iii) processing and issuing  confirmations  concerning  Customer
orders to purchase, redeem and exchange Service Shares and Premier Shares of the
Portfolio; (iv) receiving and transmitting funds representing the purchase price
or redemption  proceeds of Service  Shares and Premier  Shares of the Portfolio;
(v)  processing  dividend  payments  on behalf  of  Customers;  (vi)  forwarding
shareholder communications from the Trust (such as proxy statements and proxies,
shareholder reports,  annual and semi-annual  financial statements and dividend,
distribution  and tax  notices);  (vii)  providing  such  statistical  and other
information  as may be  reasonably  requested by the Trust or necessary  for the
Trust to comply with applicable  Federal or state law; (viii)  facilitating  the
inclusion of the Portfolio in investment,  retirement,  asset  allocation,  cash
management or sweep  accounts or similar  programs or services  offered to their
Customers  or  to  Customers  of  other  Servicing  Agents;   (ix)  facilitating
electronic  or computer  trading  and/or  processing  in the  Portfolio to their
Customers or to Customers of other  Servicing  Agents;  and (x)  performing  any
other similar administrative support services.  Payments of the Service Fee with
respect to the  Premier  Shares  will also be used to  compensate  or  reimburse
Northern and the Servicing Agents for personal and account maintenance  services
and expenses, which may include, without limitation: (i) providing facilities to
answer  inquiries  and  respond  to  correspondence  with  Customers  and  other
investors about the status of their accounts or about other aspects of the Trust
or the Portfolio;  (ii)  assisting  Customers in completing  application  forms,
selecting  dividend and other account options and opening custody  accounts with
the  Servicing  Agents;  (iii)  providing  services  to  Customers  intended  to
facilitate,  or improve  their  understanding  of the benefits and risks of, the
Portfolio to Customers,  including asset allocation and other similar  services;
(iv) acting as liaison  between  Customers  and the Trust,  including  obtaining
information  from the Trust and  assisting  the Trust in  correcting  errors and
resolving  problems;  and  (v)  performing  any  similar  personal  and  account
maintenance services.

         Conflict of interest  restrictions  (including the Employee  Retirement
Income  Security  Act of 1974)  may  apply to a  Servicing  Agent's  receipt  of
compensation  paid by the Trust in connection  with the  investment of fiduciary
funds in Service or Premier Shares.  Servicing Agents, including banks regulated
by the  Comptroller  of the Currency,  the Federal  Reserve Board or the Federal
Deposit Insurance Corporation,  and investment advisers and other money managers
subject  to the  jurisdiction  of the  SEC,  the  Department  of  Labor or state
securities  commissions,  are urged to consult legal advisers  before  investing
fiduciary assets in Service or Premier Shares.

         The  Trustees,  including  a  majority  of the  Trustees  who  are  not
interested  persons  of the Trust and who have no direct or  indirect  financial
interest in the operation of such Plan or the related  agreements,  approved the
Plan and related agreement for the Portfolio at a meeting called for the purpose
of voting on such Plan and related  agreement  on October 5, 1999.  The Plan and
related  agreement  will remain in effect until April 30, 2000 and will continue
in effect thereafter only if such continuance is specifically  approved annually
by a vote of the Board of Trustees in the manner described above.

         The Plan may not be amended  to  increase  materially  the amount to be
spent  for the  services  described  therein  without  approval  of the Board of
Trustees in the manner  described  above.  The Plan may be  terminated as to the
Service  Class  and  the  Premier  Class  at  any  time  by a  majority  of  the
non-interested  Trustees.  A service  agreement  may be  terminated at any time,
without  payment  of any  penalty,  by vote of a  majority  of the  Trustees  as
described  above or by any party to the  agreement  on not more than  sixty (60)
days' written notice to any other party to the agreement. Each service agreement
shall  terminate  automatically  if assigned.  While the Plan is in effect,  the
selection and nomination of those Trustees who are not interested  persons shall
be committed to the non-interested  members of the Board of Trustees.  The Board
of  Trustees  has  determined  that,  in its  judgment,  there  is a  reasonable
likelihood  that the Plan will benefit the  Portfolio and holders of Service and
Premier  Shares of the  Portfolio.  The Plan provides that the Board of Trustees
will review,  at least quarterly,  a written report of the amount expended under
the Plan and the purposes of the expenditures.

                                            OTHER INFORMATION

         The  Prospectus  and this  Additional  Statement do not contain all the
information included in the Registration  Statement filed with the SEC under the
Securities  Act of 1933 with  respect to the  securities  offered by the Trust's
Prospectus.  Certain  portions of the  Registration  Statement have been omitted
from the  Prospectus  and this  Additional  Statement  pursuant to the rules and
regulations of the SEC. The Registration  Statement including the exhibits filed
therewith may be examined at the office of the SEC in Washington, D.C.

         The  Portfolio is  responsible  for the payment of its  expenses.  Such
expenses include, without limitation,  the fees and expenses payable to Northern
and First Data,  brokerage fees and  commissions,  fees for the  registration or
qualification  of  Portfolio  shares  under  Federal or state  securities  laws,
expenses  of the  organization  of the  Portfolio,  taxes,  interest,  costs  of
liability insurance, fidelity bonds, indemnification or contribution, any costs,
expenses or losses arising out of any liability of or claim for damages or other
relief  asserted  against the Trust for  violation  of any law,  legal,  tax and
auditing  fees and expenses,  Service  Fees,  expenses of preparing and printing
prospectuses, statements of additional information, proxy materials, reports and
notices  and  the  printing  and   distributing  of  the  same  to  the  Trust's
shareholders  and  regulatory  authorities,  compensation  and  expenses  of its
Trustees,  expenses for industry  organizations  such as the Investment  Company
Institute,  miscellaneous  expenses and  extraordinary  expenses incurred by the
Trust.

         The term  "majority of the  outstanding  shares" of either the Trust or
the  Portfolio  means,  with respect to the approval of an  investment  advisory
agreement or a change in a fundamental investment  restriction,  the vote of the
lesser of (i) 67% or more of the shares of the Trust or the Portfolio present at
a  meeting,  if the  holders of more than 50% of the  outstanding  shares of the
Trust or the Portfolio are present or  represented  by proxy,  or (ii) more than
50% of the outstanding shares of the Trust or the Portfolio.

         Statements  contained in the Prospectus or in this Additional Statement
as to the  contents  of any  contract  or other  documents  referred  to are not
necessarily complete, and in each instance reference is made to the copy of such
contract or other document filed as an exhibit to the registration  statement of
which  the  Prospectus  and this  Additional  Statement  form a part,  each such
statement being qualified in all respects by such reference.



<PAGE>



                                                    APPENDIX A

COMMERCIAL PAPER RATINGS

A Standard & Poor's ("S&P")  commercial paper rating is a current  assessment of
the likelihood of timely payment of debt having an original  maturity of no more
than 365 days. The following  summarizes the rating  categories used by Standard
and  Poor's  for  commercial  paper  that is a  permissible  investment  for the
Portfolios:

         "A-1" - Obligations are rated in the highest  category  indicating that
         the  obligor's  capacity  to  meet  its  financial  commitment  on  the
         obligation is strong.  Within this category,  certain  obligations  are
         designated  with a plus sign (+).  This  indicates  that the  obligor's
         capacity  to meet its  financial  commitment  on these  obligations  is
         extremely strong.

         "A-2" -  Obligations  are  somewhat  more  susceptible  to the  adverse
         effects  of changes  in  circumstances  and  economic  conditions  than
         obligations  in  higher  rating  categories.   However,  the  obligor's
         capacity  to  meet  its  financial  commitment  on  the  obligation  is
         satisfactory.

Moody's commercial paper ratings are opinions of the ability of issuers to repay
punctually  senior debt obligations not having an original maturity in excess of
one  year,  unless  explicitly  noted.  The  following   summarizes  the  rating
categories used by Moody's for commercial paper that is a permissible investment
for the Portfolios:

         "Prime-1"  -  Issuers  (or  supporting  institutions)  have a  superior
         ability for repayment of senior  short-term debt  obligations.  Prime-1
         repayment  ability  will often be  evidenced  by many of the  following
         characteristics:   leading   market   positions   in   well-established
         industries;  high  rates  of  return  on funds  employed;  conservative
         capitalization structure 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.

         "Prime-2" - Issuers (or supporting  institutions) have a strong ability
         for repayment of senior short-term debt obligations. This will normally
         be evidenced by many of the characteristics cited above but to a lesser
         degree.  Earnings trends and coverage ratios,  while sound, may be more
         subject  to  variation.  Capitalization  characteristics,  while  still
         appropriate,  may  be  more  affected  by  external  conditions.  Ample
         alternate liquidity is maintained.

The  following  summarizes  the  rating  categories  used by Duff &  Phelps  for
commercial paper that is a permissible investment for the Portfolios:

         "D-1+" - Debt  possesses  the  highest  certainty  of  timely  payment.
         Short-term  liquidity,  including  internal  operating  factors  and/or
         access to alternative  sources of funds, is outstanding,  and safety is
         just below risk-free U.S. Treasury short-term obligations.

         "D-1" - Debt possesses very high certainty of timely payment. Liquidity
         factors are  excellent  and  supported by good  fundamental  protection
         factors. Risk factors are minor.

         "D-1-" - Debt  possesses high  certainty of timely  payment.  Liquidity
         factors  are  strong  and  supported  by  good  fundamental  protection
         factors. Risk factors are very small.

         "D-2" - Debt  possesses  good  certainty of timely  payment.  Liquidity
         factors and company  fundamentals  are sound.  Although ongoing funding
         needs may  enlarge  total  financing  requirements,  access to  capital
         markets is good. Risk factors are small.

Duff & Phelps employs three  designations,  "D-1+," "D-1" and "D-1-," within the
highest rating category.

Fitch IBCA short-term  ratings apply to debt obligations that have time horizons
of less  than 12  months  for most  obligations,  or up to three  years for U.S.
public finance securities.  The following  summarizes the rating categories used
by Fitch IBCA for short-term  obligations  that are permissible  investments for
the Portfolios:

         "F1" - Securities possess the highest credit quality.  This designation
         indicates  the  strongest  capacity  for timely  payment  of  financial
         commitments  and may  have an added  "+" to  denote  any  exceptionally
         strong credit feature.

         "F2"  -  Securities  possess  good  credit  quality.  This  designation
         indicates  a  satisfactory  capacity  for timely  payment of  financial
         commitments, but the margin of safety is not as great as in the case of
         the higher ratings.

Thomson  BankWatch  short-term  ratings  assess the  likelihood  of an  untimely
payment of principal and interest of debt instruments  with original  maturities
of one year or less.  The  following  summarizes  the  ratings  used by  Thomson
BankWatch for short-term  obligations  that are permissible  investments for the
Portfolios:

         "TBW-1"  - This  designation  represents  Thomson  BankWatch's  highest
         category  and  indicates  a very high  likelihood  that  principal  and
         interest will be paid on a timely basis.

         "TBW-2"  - This  designation  represents  Thomson  BankWatch's  second-
         highest  category  and  indicates  that  while  the  degree  of  safety
         regarding  timely  repayment of principal  and interest is strong,  the
         relative degree of safety is not as high as for issues rated "TBW-1."

CORPORATE AND MUNICIPAL LONG-TERM DEBT RATINGS

The following summarizes the ratings used by Standard & Poor's for corporate and
municipal debt that are permissible investments for the Portfolios:

         "AAA" - An obligation  rated "AAA" has the highest  rating  assigned by
         Standard  &  Poor's.  The  obligor's  capacity  to meet  its  financial
         commitment on the obligation is extremely strong.

         "AA"  - An  obligation  rated  "AA"  differs  from  the  highest  rated
         obligations  only in small degree.  The obligor's  capacity to meet its
         financial commitment on the obligation is very strong.

PLUS (+) OR MINUS (-) - The "AA"  rating  classification  may be modified by the
addition  of a plus or minus  sign to show  relative  standing  within the major
rating categories.

"r" - This symbol is attached to the  ratings of  instruments  with  significant
noncredit  risks.  It  highlights  risks to principal or  volatility of expected
returns  which  are  not  addressed  in the  credit  rating.  Examples  include:
obligations  linked  or  indexed  to  equities,   currencies,   or  commodities;
obligations  exposed  to  severe  prepayment  risk - such  as  interest-only  or
principal-only  mortgage  securities;   and  obligations  with  unusually  risky
interest terms, such as inverse floaters.

The following summarizes the ratings used by Moody's for corporate and municipal
long-term debt that are permissible investments for the Portfolios:

         "Aaa" - Bonds are  judged  to be of the best  quality.  They  carry the
         smallest  degree of investment  risk and are  generally  referred to as
         "gilt  edged."  Interest  payments  are  protected  by a large or by an
         exceptionally  stable margin and principal is secure. While the various
         protective  elements  are  likely to  change,  such  changes  as can be
         visualized  are  most  unlikely  to  impair  the  fundamentally  strong
         position of such issues.

         "Aa" -  Bonds  are  judged  to be of  high  quality  by all  standards.
         Together with the "Aaa" group they comprise what are generally known as
         high- grade  bonds.  They are rated  lower than the best bonds  because
         margins of  protection  may not be as large as in "Aaa"  securities  or
         fluctuation of protective elements may be of greater amplitude or there
         may be other  elements  present  which make the  long-term  risk appear
         somewhat larger than the "Aaa" securities.

Con.  (---) - Bonds for which the security  depends upon the  completion of some
act or the  fulfillment  of some  condition are rated  conditionally.  These are
bonds secured by (a) earnings of projects  under  construction,  (b) earnings of
projects  unseasoned  in  operating  experience,  (c)  rentals  which begin when
facilities are completed, or (d) payments to which some other limiting condition
attaches.  Parenthetical  rating denotes probable credit stature upon completion
of construction or elimination of basis of condition.

Note:   Moody's  applies  numerical   modifiers  1,  2,  and  3  in  the  rating
classification  "Aa". The modifier 1 indicates that the obligation  ranks in the
higher end of its generic rating category;  the modifier 2 indicates a mid-range
ranking;  and the modifier 3 indicates a ranking in the lower end of its generic
rating category.

The following  summarizes  the long-term  debt ratings used by Duff & Phelps for
corporate and municipal long-term debt that are permissible  investments for the
Portfolios:

         "AAA" - Debt is considered  to be of the highest  credit  quality.  The
         risk  factors  are  negligible,  being  only  slightly  more  than  for
         risk-free U.S. Treasury debt.

         "AA" - Debt is  considered  to be of high  credit  quality.  Protection
         factors are strong.  Risk is modest but may vary  slightly from time to
         time because of economic conditions.

To provide more detailed indications of credit quality, the "AA" and "A" ratings
may be modified by the addition of a plus (+) or minus (-) sign to show relative
standing within these major categories.

The  following  summarizes  the  ratings  used by Fitch IBCA for  corporate  and
municipal bonds that are permissible investments for the Portfolio:

         "AAA" - Bonds  considered  to be  investment  grade and of the  highest
         credit quality.  These ratings denote the lowest  expectation of credit
         risk and are assigned only in case of exceptionally strong capacity for
         timely  payment  of  financial  commitments.  This  capacity  is highly
         unlikely to be adversely affected by foreseeable events.

         "AA" - Bonds  considered to be investment grade and of very high credit
         quality. These ratings denote a very low expectation of credit risk and
         indicate  very  strong   capacity  for  timely   payment  of  financial
         commitments.   This  capacity  is  not   significantly   vulnerable  to
         foreseeable events.

To provide more detailed  indications of credit  quality,  the Fitch IBCA rating
"AA" may be  modified  by the  addition  of a plus (+) or minus (-) sign to show
relative standing within the major rating category.

Thomson BankWatch  assesses the likelihood of an untimely repayment of principal
or  interest  over the term to maturity  of long term debt and  preferred  stock
which are issued by United States commercial banks,  thrifts and non-bank banks;
non-United States banks; and broker-dealers. The following summarizes the rating
categories  used by Thomson  BankWatch  for  long-term  debt  ratings  for those
investments which are permissible investments for the Portfolios:

         "AAA" - This designation  indicates that the ability to repay principal
         and interest on a timely basis is extremely high.

         "AA" - This  designation  indicates  a very  strong  ability  to  repay
         principal and interest on a timely basis, with limited incremental risk
         compared to issues rated in the highest category.

PLUS (+) OR MINUS (-) The  ratings  "AAA"  and "AA" may  include a plus or minus
sign designation which indicates where within the respective  category the issue
is placed.

Municipal Note Ratings

A Standard and Poor's rating  reflects the liquidity  concerns and market access
risks unique to notes due in three years or less.  The following  summarizes the
ratings used by Standard & Poor's  Ratings  Group for  municipal  notes that are
permissible investments for the Portfolios:

         "SP-1" - The issuers of these municipal notes exhibit a strong capacity
         to pay principal and interest.  Those issues determined to possess very
         strong characteristics are given a plus (+) designation.

         "SP-2" - The  issuers of these  municipal  notes  exhibit  satisfactory
         capacity to pay  principal  and interest,  with some  vulnerability  to
         adverse financial and economic changes over the term of the notes.

Moody's  ratings for state and municipal  notes and other  short-term  loans are
designated Moody's Investment Grade ("MIG") and variable rate demand obligations
are  designated  Variable  Moody's  Investment  Grade  ("VMIG").   Such  ratings
recognize the differences between short-term credit risk and long-term risk. The
following  summarizes  the  ratings  by  Moody's  Investors  Service,  Inc.  for
short-term notes that are permissible investments for the Portfolios:

         "MIG-1"/"VMIG-1"  - This  designation,  denotes best quality.  There is
         present strong protection by established cash flows, superior liquidity
         support  or   demonstrated   broad-based   access  to  the  market  for
         refinancing.

         "MIG-2"/"VMIG-2" - This designation, denotes high quality, with margins
         of protection  that are ample although not so large as in the preceding
         group.

Fitch  IBCA  and  Duff &  Phelps  use the  short-term  ratings  described  under
Commercial  Paper Ratings for municipal notes that are  permissible  investments
for the Portfolios.


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