MORGAN STANLEY TANGIBLE ASSET FUND L P
424B3, 1998-07-10
COMMODITY CONTRACTS BROKERS & DEALERS
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<PAGE>
                                                Filed Pursuant to Rule 424(b)(3)
                                                      Registration No. 333-33975
 
                    MORGAN STANLEY TANGIBLE ASSET FUND L.P.
               954,496.517 UNITS OF LIMITED PARTNERSHIP INTEREST
                             ---------------------
                                   SUPPLEMENT
                                 TO PROSPECTUS
                            DATED NOVEMBER 10, 1997
 
THIS SUPPLEMENT IS AN INTEGRAL PART OF, AND MUST BE READ TOGETHER WITH, THE
PROSPECTUS DATED NOVEMBER 10, 1997 (THE "PROSPECTUS"). ALL CAPITALIZED TERMS
USED IN THIS SUPPLEMENT AND NOT DEFINED HEREIN SHALL HAVE THE SAME MEANINGS AS
USED IN THE PROSPECTUS. ALL PAGE AND SECTION REFERENCES HEREIN ARE TO THE
PROSPECTUS, EXCEPT REFERENCES TO PAGES PRECEDED BY AN "S-", WHICH ARE TO THIS
SUPPLEMENT.
 
THESE ARE SPECULATIVE SECURITIES AND INVOLVE A HIGH DEGREE OF RISK. THESE
SECURITIES ARE SUITABLE FOR INVESTMENT ONLY BY A PERSON WHO CAN AFFORD TO LOSE
HIS ENTIRE INVESTMENT. SEE "SUMMARY OF THE PROSPECTUS--INVESTMENT REQUIREMENTS"
(PAGE 1), "RISK FACTORS" (PAGE 11), AND "CONFLICTS OF INTEREST" (PAGE 18).
 
    The Partnership is not a mutual fund or any other type of investment company
within the meaning of the Investment Company Act of 1940, as amended, and is not
subject to regulation thereunder.
 
    An investment in the Partnership involves significant risks, including the
following:
 
    - Futures interests trading is speculative and volatile. The Partnership's
      trading has been volatile. Such volatility could result in an investor
      losing all or a substantial part of his investment.
 
    - The Partnership is subject to substantial charges by the Trading Advisor,
      the General Partner and MS & Co. The Partnership must earn estimated net
      trading profits of 3.23% per year of its average annual Net Assets (after
      taking into account estimated interest income based upon current rates of
      5%) in order to offset Partnership expenses, and 4.96% to offset
      Partnership expenses and the 2% redemption charge if Units are redeemed on
      or prior to the last day of the eleventh month after they are purchased.
 
    - No secondary market for Units exists. Units may be redeemed monthly only
      after the end of the sixth month following the closing at which an
      investor first became a Limited Partner. A Unit redeemed at or prior to
      the twenty-fourth month following the closing at which such Unit was
      issued may be subject to redemption charges. Certain market conditions may
      result in possible delays in, or inability to pay, redemptions.
 
    - Conflicts of interests exist that may adversely affect the Partnership,
      including the facts that the Trading Advisor, DWR, the General Partner and
      the Commodity Brokers are affiliates, fees to such parties have not been
      negotiated in arm's-length transactions, and DWR employees will receive a
      portion of the brokerage fees paid by the Partnership. See "Conflicts of
      Interest."
 
    - The Partnership will not be profitable unless the Trading Advisor is
      successful with its trading program. Past performance is not necessarily
      indicative of future results.
 
    - While the General Partner does not intend to make any distributions,
      profits earned in any year will result in taxable income to investors.
 
THESE SECURITIES HAVE NOT BEEN APPROVED OR DISAPPROVED BY THE SECURITIES AND
EXCHANGE COMMISSION OR ANY STATE SECURITIES COMMISSION NOR HAS THE SECURITIES
AND EXCHANGE COMMISSION OR ANY STATE SECURITIES COMMISSION PASSED UPON THE
ACCURACY OR ADEQUACY OF THIS PROSPECTUS. ANY REPRESENTATION TO THE CONTRARY IS A
CRIMINAL OFFENSE.
 
THE COMMODITY FUTURES TRADING COMMISSION HAS NOT PASSED UPON THE MERITS OF
PARTICIPATING IN ANY ONE OF THESE POOLS NOR HAS THE COMMISSION PASSED UPON THE
ADEQUACY OR ACCURACY OF THIS DISCLOSURE DOCUMENT.
                            ------------------------
 
                           MORGAN STANLEY DEAN WITTER
                    DEAN WITTER REYNOLDS INC., SELLING AGENT
                 THE DATE OF THIS SUPPLEMENT IS JULY 10, 1998.
<PAGE>
                               TABLE OF CONTENTS
 
<TABLE>
<CAPTION>
                                                                                                              PAGE
                                                                                                            ---------
<S>                                                                                                         <C>
The Offering, Plan of Distribution and Subscription Procedure.............................................        S-1
The Partnership...........................................................................................        S-2
  Performance Record......................................................................................        S-2
  Selected Financial Data.................................................................................        S-3
  Management's Discussion and Analysis of Financial Condition and Results of Operations...................        S-4
Description of Charges to the Partnership.................................................................        S-5
Capitalization............................................................................................        S-6
The General Partner.......................................................................................        S-7
  Directors and Officers of the General Partner...........................................................        S-7
  Description and Performance Information of Commodity Pools Operated by the General Partner..............        S-7
The Trading Advisor.......................................................................................       S-11
Certain Litigation........................................................................................       S-12
Potential Advantages......................................................................................       S-12
Experts...................................................................................................       S-14
Morgan Stanley Tangible Asset Fund L.P.
  Statement of Financial Condition........................................................................       S-15
  Statement of Operations.................................................................................       S-16
  Statement of Changes in Partners' Capital...............................................................       S-17
  Statement of Cash Flows.................................................................................       S-18
  Footnotes to Financial Statements (unaudited)...........................................................       S-19
Demeter Management Corporation
  Independent Auditors' Report............................................................................       S-22
  Statements of Financial Condition.......................................................................       S-23
                                                                                                                 S-24
  Notes to Statements of Financial Condition..............................................................
    (Certain information relating to the financial condition of Demeter Management Corporation's parent is
    contained in "The General Partner")
Annex A--Subscription and Exchange Agreement and Power of Attorney........................................        A-1
</TABLE>
 
                                      S-ii
<PAGE>
   THE FOLLOWING INFORMATION SUPPLEMENTS, OR, IN CERTAIN INSTANCES, REPLACES
PORTIONS OF, THE PROSPECTUS, AND ACCORDINGLY MUST BE READ AS AN INTEGRAL PART OF
                                THE PROSPECTUS.
                       THE OFFERING, PLAN OF DISTRIBUTION
                           AND SUBSCRIPTION PROCEDURE
 
    THE FOLLOWING UPDATES AND REPLACES, WHERE APPLICABLE, THE INFORMATION UNDER
"SUMMARY OF THE PROSPECTUS--THE OFFERING" ON PAGES 7-9, "PLAN OF DISTRIBUTION"
ON PAGES 51-54, AND "SUBSCRIPTION PROCEDURE" ON PAGES 54-55.
 
    At the First Closing held on January 2, 1998, 2,547,686.803 Units were
issued and sold, at $10.00 per Unit, and the Partnership received proceeds of
$25,476,868.03. At the Second Closing held on February 2, 1998, 572,639.328
Units were issued and sold, at $10.13 per Unit (the Net Asset Value per Unit as
of the close of business on January 31, 1998), and the Partnership received
proceeds of $5,800,837.21. At the Third Closing held on March 2, 1998,
367,946.812 Units were issued and sold, at $9.53 per Unit (the Net Asset Value
per Unit as of the close of business on February 28, 1998), and the Partnership
received proceeds of $3,506,533.00. At the Fourth Closing held on April 1, 1998,
557,230.540 Units were issued and sold, at $9.54 per Unit (the Net Asset Value
per Unit as of the close of business on March 31, 1998), and the Partnership
received proceeds of $5,315,979.31. Thus, an aggregate of 4,045,503.483 Units
were issued and sold at the four Closings, and the Partnership received
aggregate proceeds of $40,100,217.55. In connection with the four Closings, the
General Partner contributed an aggregate of $430,000 to the Partnership, and was
issued an aggregate of 43,395.648 Units of General Partnership Interest, which
it still owned as of May 31, 1998.
 
    Notwithstanding the statement in the Prospectus that the Offering Period was
not to be extended beyond May 29, 1998, the Partnership, the General Partner,
the Trading Advisor and DWR have now agreed to extend the Offering Period until
no later than October 16, 1998 (the "Extended Offering Period"). Accordingly,
the 954,496.517 Units remaining unsold after the Fourth Closing are now being
offered for sale, in the sole discretion of the General Partner, at a Fifth and
Sixth Closing, currently scheduled to be held on August 3, 1998 and September 1,
1998, respectively, and possibly at a Seventh Closing, at a price per Unit equal
to 100% of the Net Asset Value thereof as of the close of business on the last
day of the month immediately preceding such closing. No minimum number of Units
need be issued and sold during the Extended Offering Period.
 
    Pursuant to the Selling Agreement, as amended, among the Partnership, the
General Partner, the Trading Advisor and DWR, DWR will use its best efforts to
sell the Units offered during the Extended Offering Period, but DWR has not made
any commitment to offer and sell a specific amount of Units or to purchase any
Units. Funds with respect to a subscription received during the Extended
Offering Period and not immediately rejected by the General Partner will be
transferred to, and held in escrow by, the Escrow Agent, and interest will be
earned and paid on such escrowed amounts, in the same manner described under
"Plan of Distribution" in the Prospectus. Employees of DWR will receive
compensation from DWR, and not from the Partnership, out of the portion of the
brokerage fees received by DWR from MS & Co., with regard to Units sold during
the Extended Offering Period, on the same basis described under "Plan of
Distribution" in the Prospectus with regard to Units sold at the first four
Closings.
 
    In order to purchase Units during the Extended Offering Period, a subscriber
must complete, execute and deliver to DWR the Subscription Signature Page (pages
9 and 10) or Exchange Signature Page (pages 11 and 12), as applicable, from the
form of Subscription and Exchange Agreement and Power of Attorney annexed to
this Supplement as Annex A (in lieu of the form annexed to the Prospectus as
Exhibit B). A separate execution copy of such Agreement accompanies this
Supplement or may be obtained, after delivery of the Prospectus, this Supplement
and the Partnership's latest Monthly Report, from a local DWR branch office.
 
                                      S-1
<PAGE>
                                THE PARTNERSHIP
 
    THE FOLLOWING SUPPLEMENTS THE PROSPECTUS BY PROVIDING INFORMATION CONCERNING
THE PERFORMANCE OF THE PARTNERSHIP SINCE IT COMMENCED TRADING.
 
PERFORMANCE RECORD
 
    The Partnership began trading on January 2, 1998. The performance summary of
the Partnership from the commencement of trading through May 31, 1998 is set
forth in Table I below. All performance information has been calculated on an
accrual basis in accordance with generally accepted accounting principles.
 
                            ------------------------
 
INVESTORS ARE CAUTIONED THAT THE INFORMATION SET FORTH IN THE CAPSULE
PERFORMANCE SUMMARY IS NOT INDICATIVE OF, AND HAS NO BEARING ON, ANY TRADING
RESULTS WHICH MAY BE ATTAINED BY THE PARTNERSHIP IN THE FUTURE. SINCE PAST
RESULTS ARE NOT A GUARANTEE OF FUTURE RESULTS, THERE CAN BE NO ASSURANCE THAT
THE PARTNERSHIP WILL MAKE ANY PROFITS AT ALL OR WILL BE ABLE TO AVOID INCURRING
SUBSTANTIAL LOSSES. INVESTORS SHOULD ALSO NOTE THAT INTEREST INCOME MAY
CONSTITUTE A SIGNIFICANT PORTION OF A COMMODITY POOL'S TOTAL INCOME AND, IN
CERTAIN INSTANCES, MAY GENERATE PROFITS WHERE THERE HAVE BEEN REALIZED OR
UNREALIZED LOSSES FROM FUTURES INTEREST TRADING.
 
                                                                         TABLE I
 
               PERFORMANCE OF MORGAN STANLEY TANGIBLE ASSET FUND
 
Type of Pool:  Publicly-Offered Fund
Inception of Trading:  January 2, 1998
Aggregate Subscriptions:  $40,530,217
Current Capitalization:  $35,421,681
Current Net Asset Value per Unit:  $8.67
Worst Monthly % Drawdown (Month/Year):  (6.87)% (May 1998)
Worst Month-End Peak-to-Valley Drawdown:  (14.41)% (4 months, 2/98-5/98)
 
<TABLE>
<CAPTION>
                                                                     MONTHLY RATE
                                                                       OF RETURN
                                                                     -------------
MONTH                                                                    1998
- -------------------------------------------------------------------  -------------
<S>                                                                  <C>
                                                                           %
January............................................................      1.30
February...........................................................     (5.92)
March..............................................................      0.10
April..............................................................     (2.41)
May................................................................     (6.87)
Compound Annual/Period
 Rate of Return....................................................     (13.30)
                                                                      (5 months)
</TABLE>
 
                               FOOTNOTES TO TABLE
 
    "DRAWDOWN" MEANS DECLINE IN NET ASSET VALUE PER UNIT. "WORST MONTH-END
PEAK-TO-VALLEY DRAWDOWN" AS USED HEREIN IS EQUIVALENT TO THE "DRAWDOWN"
EXPERIENCED BY THE PARTNERSHIP, DETERMINED IN ACCORDANCE WITH CFTC RULE 4.10,
AND REPRESENTS THE GREATEST PERCENTAGE DECLINE FROM ANY MONTH-END NET ASSET
VALUE PER UNIT WHICH OCCURS WITHOUT SUCH MONTH-END NET ASSET VALUE PER UNIT
BEING EQUALED OR EXCEEDED AS OF A SUBSEQUENT MONTH-END. IN DOLLAR TERMS, FOR
EXAMPLE, IF THE NET ASSET VALUE PER UNIT OF THE PARTNERSHIP DECLINED BY $1 IN
EACH OF JANUARY AND FEBRUARY, INCREASED BY $1 IN MARCH AND DECLINED AGAIN BY $2
IN APRIL, A "PEAK-TO-VALLEY DRAWDOWN" ANALYSIS CONDUCTED AS OF THE END OF APRIL
WOULD CONSIDER THAT "DRAWDOWN" TO BE STILL CONTINUING AND TO BE $3 IN AMOUNT,
WHEREAS IF THE NET ASSET VALUE OF
 
                                      S-2
<PAGE>
A UNIT HAD INCREASED BY $2 IN MARCH, THE JANUARY-FEBRUARY DRAWDOWN WOULD HAVE
ENDED AS OF THE END OF FEBRUARY AT THE $2 LEVEL. SUCH "DRAWDOWNS" ARE MEASURED
ON THE BASIS OF MONTH-END NET ASSET VALUES ONLY, AND DO NOT REFLECT INTRA-MONTH
FIGURES.
 
    "MONTHLY RATE OF RETURN" IS THE PERCENTAGE CHANGE IN NET ASSET VALUE PER
UNIT FROM ONE MONTH TO ANOTHER.
 
    "COMPOUND ANNUAL (PERIOD) RATE OF RETURN" IS CALCULATED BY MULTIPLYING ON A
COMPOUND BASIS EACH OF THE MONTHLY RATES OF RETURN AND NOT BY ADDING OR
AVERAGING SUCH MONTHLY RATES OF RETURN. FOR PERIODS OF LESS THAN ONE YEAR, THE
RESULTS ARE YEAR-TO-DATE.
 
SELECTED FINANCIAL DATA
 
    The following is the results of operations of the Partnership for the period
from January 2, 1998 (commencement of operations) to March 31, 1998. For the
complete financial statements of the Partnership, see page F-1 of the Prospectus
and page S-15 of this Supplement. For performance information with respect to
the Partnership, see "The Partnership--Performance Record" above.
 
<TABLE>
<CAPTION>
                                                             FOR THE PERIOD
                                                                  FROM
                                                            JANUARY 2, 1998
                                                            (COMMENCEMENT OF
                                                             OPERATIONS) TO
                                                             MARCH 31, 1998
                                                            ----------------
                                                                   $
<S>                                                         <C>
REVENUES
Trading Profit (Loss):
  Realized................................................       (1,378,000)
  Net change in unrealized................................           97,560
                                                            ----------------
    Total Trading Results.................................       (1,280,440)
Interest income (MS & Co.)................................          313,122
                                                            ----------------
 
    Total Revenues........................................         (967,318)
                                                            ----------------
EXPENSES
Brokerage fees (MS & Co. and MSIL)........................          277,573
Management fees (MSCM)....................................          190,118
Service fee (Demeter).....................................           76,047
                                                            ----------------
    Total Expenses........................................          543,738
                                                            ----------------
NET LOSS..................................................       (1,511,056)
                                                            ----------------
                                                            ----------------
NET LOSS ALLOCATION:
Limited Partners..........................................       (1,475,165)
General Partner...........................................          (35,891)
 
NET LOSS PER UNIT:
Limted Partners...........................................             (.46)
General Partners..........................................             (.46)
 
TOTAL ASSETS AT END OF PERIOD.............................       39,214,236
TOTAL NET ASSETS AT END OF PERIOD.........................       39,014,097
NET ASSET VALUE PER UNIT AT END OF PERIOD
Limited Partners..........................................             9.54
General Partner...........................................             9.54
</TABLE>
 
                                      S-3
<PAGE>
MANAGEMENT'S DISCUSSION AND ANALYSIS OF FINANCIAL CONDITION AND RESULTS OF
  OPERATIONS
 
    LIQUIDITY.  The Partnership's assets are on deposit in separate commodity
interest trading accounts with MS & Co. and MSIL, the Commodity Brokers, and are
used by the Partnership as margin to engage in commodity futures, forward
contracts and other commodity interest trading. MS & Co. and MSIL hold such
assets in either designated depositories or in securities approved by the CFTC
for investment of customer funds. The Partnership's assets held by MS & Co. and
MSIL may be used as margin solely for the Partnership's trading. Since the
Partnership's sole purpose is to trade in commodity futures contracts and other
commodity interests, it is expected that the Partnership will continue to own
such liquid assets for margin purposes.
 
    The Partnership's investment in commodity futures contracts, forward
contracts and other commodity interests may be illiquid. If the price for a
futures contract for a particular commodity has increased or decreased by an
amount equal to the "daily limit," positions in the commodity can neither be
taken nor liquidated unless traders are willing to effect trades at or within
the limit. Commodity futures prices have occasionally moved the daily limit for
several consecutive days with little or no trading. Such market conditions could
prevent the Partnership from promptly liquidating its commodity futures
positions and could result in restrictions on redemptions.
 
    CAPITAL RESOURCES.  The Partnership does not have, nor does it expect to
have, any capital assets. Redemptions and sales of additional Units in the
future will affect the amount of funds available for investments in subsequent
periods. As redemptions are at the discretion of Limited Partners, it is not
possible to estimate the amount and therefore, the impact of future redemptions.
 
    RESULTS OF OPERATIONS FOR THE QUARTER ENDED MARCH 31, 1998.  For the quarter
ended March 31, 1998, the Partnership's total trading losses net of interest
income were $967,318. During the first quarter, the Partnership recorded a loss
in Net Asset Value per Unit. The most significant losses were recorded during
January and February in the energy markets as the Partnership's long-only
trading approach resulted in losses as oil and gas prices moved lower.
Additional losses were recorded for the Partnership from long positions in corn
and wheat futures during February and March and from long livestock futures
positions during January. In soft commodities, losses were recorded from long
coffee futures positions during February and March as coffee prices moved lower.
A portion of the Partnership's overall losses was offset by profits experienced
from long precious metals futures positions. The most significant gains were
recorded during February as silver prices moved sharply higher. Smaller gains
were recorded in gold and platinum futures trading during February and March.
Total expenses for the quarter were $543,738, resulting in a net loss of
$1,511,056. The value of an individual Unit in the Partnership decreased from
$10.00 at January 2, 1998 to $9.54 at March 31, 1998.
 
                                      S-4
<PAGE>
                   DESCRIPTION OF CHARGES TO THE PARTNERSHIP
 
    THE FOLLOWING UPDATES THE BREAK EVEN INFORMATION UNDER "SUMMARY OF THE
PROSPECTUS-- DESCRIPTION OF CHARGES TO THE PARTNERSHIP" ON PAGE 5, AND UPDATES
AND REPLACES "DESCRIPTION OF CHARGES TO THE PARTNERSHIP--6. BREAK EVEN ANALYSIS"
ON PAGES 25-26 TO REFLECT A CURRENT SELLING PRICE.
 
6.  BREAK EVEN ANALYSIS
 
    Based upon the annual fees and expenses of the Partnership, the Partnership
will be required to earn estimated net trading profits (after taking into
account estimated interest income) of 4.27% of its average Net Assets in its
first year in order for a Limited Partner to pay the 1% redemption charge and to
recoup its initial investment upon redemption after one year.
 
    Based upon the Net Asset Value per Unit of $8.67 as of May 31, 1998, the
Partnership must earn estimated net trading profits of $0.37 per Unit, in order
for a Limited Partner to recoup its initial investment upon redemption of a Unit
after one year after payment by the Partnership of its expenses and payment of
the 1% redemption charge (as calculated below).
 
<TABLE>
<CAPTION>
                                                                                        AFTER             AFTER
                                                                                  ELEVEN MONTHS(8)      ONE YEAR
                                                                                ---------------------  -----------
<S>                                                                             <C>                    <C>
Net Asset Value per Unit(1)...................................................        $    8.67         $    8.67
Management Fee(2).............................................................             0.20              0.22
Brokerage Fee(3)..............................................................             0.29              0.32
Service Fee(4)................................................................             0.08              0.09
Redemption Charge(5)..........................................................             0.18              0.09
Incentive Fee(6)..............................................................               --                --
Less: Interest Income(7)......................................................             0.32              0.35
Amount of Trading Income Required for a Limited Partner to Recoup its
  Investment..................................................................             0.43              0.37
Percentage of Net Asset Value per Unit........................................             4.96%             4.27%
</TABLE>
 
- ------------------------
 
NOTES
 
(1) Units are offered for sale at the Fifth and Sixth Closings, and possibly a
    Seventh Closing, at a price per Unit equal to 100% of the Net Asset Value of
    a Unit as of the close of business on the last day of the month immediately
    preceding such closing.
 
(2) Monthly management fees are equal to 5/24 of 1% of the Net Assets on the
    first day of each month (a 2.5% annual rate).
 
(3) The brokerage fee is a monthly fee of 1/12 of 3.65% of Net Assets as of the
    first day of the month (a 3.65% annual rate). Such fee covers all brokerage
    fees and transaction fees and costs (including "give up" and transfer fees).
 
(4) The service fee is a monthly fee of 1/12 of 1% of Net Assets as of the first
    day of each month (a 1% annual rate).
 
(5) Units redeemed on or prior to the last day of the eleventh month after the
    date of purchase are subject to a 2% redemption charge; Units redeemed after
    the last day of the eleventh month and on or prior to the last day of the
    twenty-fourth month after the date of purchase are subject to a 1%
    redemption charge.
 
(6) Incentive fees are assumed to be zero because (i) interest income will
    exceed the redemption charge, and (ii) the Trading Advisor's profits from
    futures interests trading will equal all of the other fees and expenses
    reflected in this table.
 
(7) MS & Co. will credit the Partnership at each month-end with interest income
    as if 80% of the Partnership's average daily Net Assets for the month were
    invested at a rate based on U.S. Treasury Bills. Such rate was estimated at
    5% for purposes of the calculation.
 
(8) Supplementally, Units redeemed on or prior to the last day of the eleventh
    month after the date of purchase are subject to a 2% redemption charge. In
    calculating the break even analysis for a redemption occurring on the last
    day of the eleventh month, the management fee, brokerage fee, service fee
    and interest income were each prorated over an 11-month period.
 
                                      S-5
<PAGE>
                                 CAPITALIZATION
 
    THE FOLLOWING UPDATES AND REPLACES "CAPITALIZATION" ON PAGES 28-29.
 
    The following table sets forth the capitalization of the Partnership as of
May 31, 1998 and the pro forma capitalization of the Partnership adjusted to
reflect (i) the proceeds (at the Net Asset Value of $8.67 per Unit as of May 31,
1998) from the sale during the Extended Offering Period of the 954,496.517
unsold Units offered by this Supplement, and (ii) the capital contribution
required of the General Partner based on such capitalization of the Partnership.
There will be no difference insofar as sharing of profits and losses are
concerned between Units of Limited Partnership Interest and Units of General
Partnership Interest:
 
<TABLE>
<CAPTION>
                                                                                                    PRO FORMA
                                                                                                   AMOUNT TO BE
                                                                                     AMOUNT       OUTSTANDING IF
                                                                                  OUTSTANDING       ADDITIONAL
                                                                                     AS OF          UNITS ARE
                                                                                  MAY 31, 1998       SOLD(1)
                                                                                 --------------  ----------------
<S>                                                                              <C>             <C>
Limited Partnership Interest(2)................................................  $   35,045,405   $   43,320,890
General Partnership Interest(3)................................................         376,276          437,585
                                                                                 --------------  ----------------
    Total......................................................................  $   35,421,681   $   43,758,475
                                                                                 --------------  ----------------
                                                                                 --------------  ----------------
</TABLE>
 
- ------------------------
 
(1) Pro forma amounts shown assume that all Units are sold at the May 31, 1998
    Net Asset Value per Unit of $8.67.
 
(2) Units are being offered in the Extended Offering Period for sale at a Fifth
    and Sixth Closing, and possibly at a Seventh Closing, at a price based on
    the Net Asset Value per Unit as of the close of business on the last day of
    the month immediately preceding such Closing. The actual proceeds from such
    sale will depend upon the Net Asset Value per Unit applicable to the
    Closing.
 
(3) The General Partner has agreed to contribute in $1,000 increments at each
    closing an additional amount in cash as is necessary to make the General
    Partner's capital contribution at least equal to the greater of (a) 1% of
    aggregate capital contributions to the Partnership (including the General
    Partner's contribution) and (b) $25,000. Such additional contributions by
    the General Partner need not exceed the amount described above and shall be
    evidenced by Units of General Partnership Interest, each of which will have
    a Net Asset Value per Unit equal to that of the Partnership's Net Asset
    Value per Unit at the date of such closing. Under certain conditions and
    where modification will not adversely affect the interests of Limited
    Partners, the General Partner's minimum investment requirements may be
    modified by the General Partner at its option, without notice to or the
    consent of the Limited Partners.
 
                                      S-6
<PAGE>
                              THE GENERAL PARTNER
 
    THE FOLLOWING UPDATES THE INFORMATION UNDER "THE GENERAL PARTNER" ON PAGES
29-34.
 
    As reflected in the 1997 Annual Report and Form 10-Q for the quarter ended
February 28, 1998 of Morgan Stanley Dean Witter & Co. ("MSDW"; formerly, Morgan
Stanley, Dean Witter, Discover & Co.). MSDW had total shareholders' equity of
$13,956 million and total assets of $302,287 million as of November 30, 1997
(audited) and total shareholder's equity of $14,524 million and total assets of
$345,534 million as of February 28, 1998 (unaudited). Additional financial
information regarding MSDW is included in the financial statements filed as part
of such Annual Report and Form 10-Q. MSDW will provide to investors, upon
request, copies of its most recent Forms 10-K, 10-Q and 8-K, as filed from time
to time with the SEC. Such reports will be available for review or copying at
the offices of the SEC, 450 Fifth Street, N.W., Room 1024, Judiciary Plaza,
Washington, D.C. 20549 or will be available at no charge by writing to MSDW at
1585 Broadway, New York, New York 10036 (Attn: Investor Relations).
 
DIRECTORS AND OFFICERS OF THE GENERAL PARTNER
 
    Patti L. Behnke is no longer an officer of the General Partner.
 
    Lewis A. Raibley, III, age 36, is Vice President and Chief Financial Officer
of the General Partner. Mr. Raibley is currently Senior Vice President and
Controller in the Individual Asset Management Group of MSDW. From July 1997 to
May 1998, Mr. Raibley served as Senior Vice President and Director in the
Internal Reporting Department of MSDW and, prior to that, from 1992 to 1997, he
served as Senior Vice President and Director in the Financial Reporting and
Policy Division of DWD. He has been with DWD and its affiliates since June 1986.
 
DESCRIPTION AND PERFORMANCE INFORMATION OF COMMODITY POOLS OPERATED BY THE
  GENERAL PARTNER
 
    The following table sets forth summary information for the 23 other
commodity pools (other than four pools exempt from disclosure under CFTC Rule
4.7) operated to date by Demeter, thirteen of which employ one trading advisor
and ten of which employ more than one trading advisor, for which Demeter serves
as general partner. In the context of a pool with only one trading advisor,
Demeter performs general monitoring of the trading advisor and administrative
services. Generally, in the context of pools with more than one trading advisor,
in addition to providing general monitoring and administrative services, Demeter
provides asset allocation strategies in the selection and replacement of trading
advisors as well as in the allocation of assets to such advisors.
 
    While each of these commodity pools has essentially the same objective,
appreciation of its assets through speculative trading, the structure (including
fees and interest income arrangements) and performance of these pools varies
widely. For example, certain pools employ only one trading advisor while others
employ more than one advisor (several pools employ two to four trading advisors
and some have employed more than ten trading advisors at the same time). Certain
pools are so-called "principal protection pools," offering an assurance of
principal return at a date certain. The performance records of these pools
include several pools that have traded unprofitably, including four pools that
have terminated trading due to losses; other pools that have not incurred
losses, but have not achieved significant profits; and certain pools that have
performed well over time.
 
    All summary performance information is current as of April 30, 1998.
Performance information is set forth for the most recent five full years of each
pool, or in the event that a pool has been trading for less than five years,
performance information is set forth from the inception of trading. Except as
otherwise indicated, rate of return information prior to January 1, 1993 has not
been included for pools that have been trading for more than five years in
accordance with CFTC regulations. In reviewing the following summary performance
information, prospective investors should understand that (i) such
 
                                      S-7
<PAGE>
performance is calculated on the accrual basis in accordance with generally
accepted accounting principles and is "net" of all fees and charges, and (ii) a
more complete presentation of the performance of the futures funds operated or
managed by the General Partner and/or its affiliates is available without charge
upon request to the General Partner.
 
    PAST PERFORMANCE IS NOT NECESSARILY INDICATIVE OF FUTURE RESULTS AND
MATERIAL DIFFERENCES EXIST BETWEEN THE COMMODITY POOLS DESCRIBED HEREIN AND THE
PARTNERSHIP. THERE CAN BE NO ASSURANCE THAT THE PARTNERSHIP WILL PERFORM IN A
MANNER COMPARABLE TO ANY OF THE COMMODITY POOLS DESCRIBED BELOW OR THAT THE
PARTNERSHIP WOULD HAVE DONE SO IN THE PAST. INVESTORS SHOULD ALSO NOTE THAT
INTEREST INCOME MAY CONSTITUTE A SIGNIFICANT PORTION OF A COMMODITY POOL'S TOTAL
INCOME AND, IN CERTAIN INSTANCES, MAY GENERATE PROFITS WHERE THERE HAVE BEEN
REALIZED OR UNREALIZED LOSSES FROM COMMODITY TRADING.
 
                              -------------------
 
    PROSPECTIVE INVESTORS SHOULD NOTE THAT THE PERFORMANCE RECORDS OF THE
COMMODITY POOLS OPERATED BY THE GENERAL PARTNER ARE SET FORTH IN SUMMARY FORM
HEREIN. A MORE DETAILED PRESENTATION OF SUCH PERFORMANCE INFORMATION WILL BE
PROVIDED TO ANY PROSPECTIVE INVESTOR UPON REQUEST AND WITHOUT CHARGE.
 
                              -------------------
 
        PAST PERFORMANCE IS NOT NECESSARILY INDICATIVE OF FUTURE RESULTS
 
                                      S-8
<PAGE>
                         DEMETER MANAGEMENT CORPORATION
 CAPSULE SUMMARY OF PERFORMANCE INFORMATION REGARDING COMMODITY POOLS OPERATED
  (EXCEPT AS OTHERWISE INDICATED, BEGINNING JANUARY 1, 1993 THROUGH APRIL 30,
                                     1998)
<TABLE>
<CAPTION>
                                                                                                             CURRENT
                                                                                                               NET
                                                                                               CURRENT        ASSET      CUMULATIVE
                                                                                                TOTAL         VALUE        RETURN
                                                    START       CLOSE        AGGREGATE        NET ASSET        PER         SINCE
               FUND TYPE/FUND(1)                   DATE(2)     DATE(3)    SUBSCRIPTION(4)      VALUE(5)      UNIT(6)    INCEPTION(7)
- ------------------------------------------------  ----------  ----------  ----------------  --------------  ----------  ------------
<S>                                               <C>         <C>         <C>               <C>             <C>         <C>
                                                                                 $                $             $            %
PUBLICLY-OFFERED FUNDS WITH ONE ADVISOR WITHOUT "PRINCIPAL PROTECTION"
DWR Commodity Partners                            Jan-81      Dec-88            9,648,397          739,757      488.29       (51.37)
Columbia Futures Fund(11)                         Jul-83      N/A              29,276,299        8,676,206    2,638.16       169.20
DW Diversified Futures Fund L.P.(11)              Apr-88      N/A             206,815,107      122,410,956      924.29       266.48
DW Multi-Market Portfolio L.P.(11)                Sep-88      N/A             252,526,000        9,506,820    1,038.59         3.86
DW Diversified Futures Fund II L.P.               Jan-89      N/A              13,210,576       10,192,431    2,436.29       143.63
DW Diversified Futures Fund III L.P.              Nov-90      N/A             126,815,755       61,695,355    1,531.19        53.12
DW Portfolio Strategy Fund L.P.(11)               Feb-91      N/A             143,522,564      122,833,612    2,257.56       125.76
DWFCM International Access Fund L.P.              Mar-94      N/A              68,115,440       41,679,647    1,332.17        33.22
DW Spectrum Global Balanced L.P.(11)              Nov-94      N/A              32,155,851       30,401,819       14.33        43.30
PUBLICLY-OFFERED FUNDS WITH MORE THAN ONE ADVISOR WITHOUT "PRINCIPAL PROTECTION"
DW Cornerstone Fund I                             Jan-85      Dec-91           19,122,276          281,303      456.80       (53.15)
DW Cornerstone Fund II(11)                        Jan-85      N/A              65,634,484       27,748,445    3,467.26       255.62
DW Cornerstone Fund III(11)                       Jan-85      N/A             137,116,765       41,235,639    3,086.21       216.53
DW Cornerstone Fund IV(11)                        May-87      N/A             167,936,749      108,660,798    4,184.48       329.18
DW Spectrum Select L.P.(11)                       Aug-91      N/A             200,874,673      153,983,232       20.08       100.80
DW Global Perspective Portfolio L.P.              Mar-92      N/A              67,424,535       18,298,896      881.82       (11.82)
DW World Currency Fund L.P.                       Apr-93      N/A             114,945,830       27,973,610      929.96        (7.00)
DW Spectrum Strategic L.P.                        Nov-94      N/A              79,348,721       57,064,085        9.73        (2.70)
DW Spectrum Technical L.P.                        Nov-94      N/A             196,199,149      192,367,410       14.03        40.30
PUBLICLY-OFFERED FUNDS WITH ONE ADVISOR WITH "PRINCIPAL PROTECTION"
DW Principal Guaranteed Fund III L.P.             Jul-89      Sep-95          126,263,000        7,022,437    1,000.00         0.00
DW Principal Plus Fund L.P.(11)                   Feb-90      N/A             109,013,535       52,512,157    1,781.09        78.11
PUBLICLY-OFFERED FUNDS WITH MORE THAN ONE ADVISOR WITH "PRINCIPAL PROTECTION"
DW Principal Guaranteed Fund II, L.P.             Mar-89      Mar-96          162,203,303        4,966,449    1,056.55         5.66
PRIVATELY-OFFERED FUNDS WITH ONE ADVISOR WITHOUT "PRINCIPAL PROTECTION"
DWR Chesapeake L.P.                               Nov-94      N/A              16,854,355       17,478,937    1,865.00        86.50
DWR/JWH Futures Fund L.P.                         Feb-96      N/A              24,257,946       22,644,603    1,116.57        11.66
 
<CAPTION>
 
                                                      WORST       WORST PEAK-      COMPOUND ANNUAL RATES OF RETURN(10)
                                                    MONTHLY %      TO-VALLEY    ------------------------------------------
               FUND TYPE/FUND(1)                   DRAWDOWN(8)    DRAWDOWN(9)       1998          1997           1996
- ------------------------------------------------  -------------  -------------  ------------  -------------  -------------
<S>                                               <C>           <C>            <C>
                                                        %              %             %              %              %
PUBLICLY-OFFERED FUNDS WITH ONE ADVISOR WITHOUT
DWR Commodity Partners                                 (34.48)          (64.23)
                                                         7/88       4/86-12/88
Columbia Futures Fund(11)                              (17.54)          (42.58)        (6.81)         22.60          19.09
                                                         4/86        7/83-9/85     (4 months)
DW Diversified Futures Fund L.P.(11)                   (12.85)          (24.86)        (9.43)         11.96          (2.66)
                                                         5/90        5/95-6/96     (4 months)
DW Multi-Market Portfolio L.P.(11)                     (13.26)          (29.84)        (9.03)         13.28          (6.76)
                                                         2/96        5/95-6/96     (4 months)
DW Diversified Futures Fund II L.P.                    (13.41)          (25.62)        (9.24)         11.28          (4.83)
                                                         8/89        5/95-6/96     (4 months)
DW Diversified Futures Fund III L.P.                   (13.62)          (27.00)        (9.51)         12.29          (4.73)
                                                         1/92        5/95-6/96     (4 months)
DW Portfolio Strategy Fund L.P.(11)                    (14.40)          (25.65)        (4.88)         11.28          25.50
                                                         1/92        1/92-4/92     (4 months)
DWFCM International Access Fund L.P.                   (12.87)          (22.84)       (10.12)         26.22           3.97
                                                         1/95        8/94-1/95     (4 months)
DW Spectrum Global Balanced L.P.(11)                    (7.92)          (10.64)         4.22          18.23          (3.65)
                                                         2/96        2/96-5/96     (4 months)
PUBLICLY-OFFERED FUNDS WITH MORE THAN ONE ADVISO
DW Cornerstone Fund I                                  (20.88)          (64.47)
                                                         8/91        4/86-8/91
DW Cornerstone Fund II(11)                             (11.74)          (32.70)        (6.92)         18.05          11.47
                                                         9/89       7/88-10/89     (4 months)
DW Cornerstone Fund III(11)                            (18.28)          (32.35)         3.10          10.24           8.24
                                                         2/89       2/89-10/89     (4 months)
DW Cornerstone Fund IV(11)                             (21.04)          (45.21)        (5.66)         38.41          12.97
                                                         9/89        7/89-9/89     (4 months)
DW Spectrum Select L.P.(11)                            (13.72)          (26.77)        (3.69)          6.22           5.27
                                                         1/92        6/95-8/96     (4 months)
DW Global Perspective Portfolio L.P.                    (8.55)          (40.90)        (8.83)         11.16           9.26
                                                         2/96        8/93-1/95     (4 months)
DW World Currency Fund L.P.                             (9.68)          (46.04)        (6.42)         39.35          12.97
                                                         5/95        8/93-1/95     (4 months)
DW Spectrum Strategic L.P.                             (11.06)          (21.91)        (9.15)          0.37          (3.53)
                                                         4/98        4/97-4/98     (4 months)
DW Spectrum Technical L.P.                              (6.39)           (8.27)        (4.10)          7.49          18.35
                                                         2/96        3/97-5/97     (4 months)
PUBLICLY-OFFERED FUNDS WITH ONE ADVISOR WITH "PR
DW Principal Guaranteed Fund III L.P.                  (13.98)          (30.93)
                                                         1/92        5/90-4/92
 
DW Principal Plus Fund L.P.(11)                         (7.48)          (13.08)         4.30          15.39          (5.28)
                                                         2/96        2/96-5/96     (4 months)
PUBLICLY-OFFERED FUNDS WITH MORE THAN ONE ADVISO
DW Principal Guaranteed Fund II, L.P.                   (5.62)          (14.69)
                                                         1/91        8/89-4/92                                        1.00
PRIVATELY-OFFERED FUNDS WITH ONE ADVISOR WITHOUT
DWR Chesapeake L.P.                                    (16.14)          (17.80)         8.57          15.38          15.23
                                                         7/96        5/96-7/96     (4 months)
DWR/JWH Futures Fund L.P.                               (8.49)          (16.86)       (16.86)         13.66          18.17
                                                         5/97        1/98-4/98     (4 months)                   (11 months)
 
<CAPTION>
 
               FUND TYPE/FUND(1)                      1995          1994           1993
- ------------------------------------------------  ------------  -------------  ------------
                                                       %              %             %
PUBLICLY-OFFERED FUNDS WITH ONE ADVISOR WITHOUT
DWR Commodity Partners
 
Columbia Futures Fund(11)                                28.21          (5.75)        14.36
 
DW Diversified Futures Fund L.P.(11)                     (4.56)          7.68          6.65
 
DW Multi-Market Portfolio L.P.(11)                       (6.37)          2.66          8.65
 
DW Diversified Futures Fund II L.P.                      (2.90)          5.41          7.35
 
DW Diversified Futures Fund III L.P.                     (4.02)          5.89          7.58
 
DW Portfolio Strategy Fund L.P.(11)                      25.37          (5.41)        19.88
 
DWFCM International Access Fund L.P.                     21.88          (7.32)
                                                                   (10 months)
DW Spectrum Global Balanced L.P.(11)                     22.79          (1.70)
                                                                    (2 months)
PUBLICLY-OFFERED FUNDS WITH MORE THAN ONE ADVISO
DW Cornerstone Fund I
 
DW Cornerstone Fund II(11)                               26.50          (8.93)         7.81
 
DW Cornerstone Fund III(11)                              27.50         (10.04)        (4.78)
 
DW Cornerstone Fund IV(11)                               22.96         (14.27)        (9.12)
 
DW Spectrum Select L.P.(11)                              23.62          (5.12)        41.62
 
DW Global Perspective Portfolio L.P.                     16.76         (31.62)        (4.67)
 
DW World Currency Fund L.P.                               2.02         (25.13)       (17.35)
                                                                                  (9 months)
DW Spectrum Strategic L.P.                               10.49           0.10
                                                                    (2 months)
DW Spectrum Technical L.P.                               17.59          (2.20)
                                                                    (2 months)
PUBLICLY-OFFERED FUNDS WITH ONE ADVISOR WITH "PR
DW Principal Guaranteed Fund III L.P.
                                                          5.21           1.08          5.37
                                                     (9 months)
DW Principal Plus Fund L.P.(11)                          17.98          (8.61)        11.55
 
PUBLICLY-OFFERED FUNDS WITH MORE THAN ONE ADVISO
DW Principal Guaranteed Fund II, L.P.
                                                          7.30          (8.12)         9.74
PRIVATELY-OFFERED FUNDS WITH ONE ADVISOR WITHOUT
DWR Chesapeake L.P.                                      15.80          11.57
                                                                    (2 months)
DWR/JWH Futures Fund L.P.
 
</TABLE>
 
        PAST PERFORMANCE IS NOT NECESSARILY INDICATIVE OF FUTURE RESULTS
 
                                      S-9
<PAGE>
FOOTNOTES TO DEMETER MANAGEMENT CORPORATION PERFORMANCE INFORMATION
 
 1. Each pool is identified by certain of the following classifications. Funds
    that are "publicly-offered" are pools offered to the public pursuant to
    registration in accordance with the requirements of the Securities Act of
    1933, as amended. The General Partner also serves as general partner and/or
    commodity pool operator to seven "privately-offered" funds, which are pools
    offered in private placements exempt from registration pursuant to Section
    4(2) of the Securities Act of 1933, as amended, and Rule 506 thereunder.
    Performance information for four of such privately-offered funds is not
    provided, consistent with CFTC Rule 4.7. Funds with more than one advisor
    are pools the assets of which are managed by more than one commodity trading
    advisor but are not "multi-advisor pools" within the meaning of CFTC Rule
    4.10(d)(2). (The CFTC defines a multi-advisor pool as one in which no
    advisor is allocated or intended to be allocated more than 25% of the pool's
    assets available for trading.) Funds with "principal protection" are pools
    with an investment feature whereby investors are guaranteed to receive back
    at least the amount that they originally invested at a date certain in the
    future (generally 5 to 7 years after the date of subscription). Funds
    without "principal protection" are pools in which there is no guarantee of
    an investor's investment. None of the privately-offered pools has a
    principal protection feature.
 
 2. "Start Date" is the month and year in which the pool commenced operations.
 
 3. "Close Date" is the month and year in which the pool liquidated its assets
    and ceased to do business.
 
 4. "Aggregate Subscriptions" is the aggregate of all amounts ever contributed
    to the pool, including investments which were subsequently redeemed by
    investors.
 
 5. "Current Total Net Asset Value" is the net asset value of the pool as of
    April 30, 1998, and, in the case of liquidated pools, the net asset value of
    the pool on the date of liquidation.
 
 6. "Current Net Asset Value Per Unit" is the Current Total Net Asset Value
    divided by the total number of units outstanding as of April 30, 1998, and,
    in the case of liquidated pools, the net asset value per unit on the date of
    liquidation.
 
 7. "Cumulative Return Since Inception" is the percentage increase in the net
    asset value of a unit from inception through April 30, 1998.
 
 8. "Drawdown" means losses experienced by the relevant pool over the specified
    period and is calculated on a rate of return basis, I.E., dividing net
    performance by beginning equity. "Drawdown" is measured on the basis of
    monthly returns only, and does not reflect intra-month figures. The month in
    which the worst monthly drawdown occurred during the history of the pool is
    set forth under "Worst Monthly % Drawdown."
 
 9. "Peak-to-Valley Drawdown" is the largest percentage decline in the net asset
    value per unit over the history of the fund. This need not be a continuous
    decline, but can be a series of positive and negative returns where the
    negative returns are larger than the positive ones. "Peak-to-Valley
    Drawdown" represents the greatest percentage decline from any month-end net
    asset value per unit which occurs without such month-end net asset value per
    unit being equaled or exceeded as of a subsequent month-end. For example, if
    the net asset value per unit of a particular pool declined by $1 in each of
    January and February, increased by $1 in March and declined again by $2 in
    April, a "peak-to-valley drawdown" analysis conducted as of the end of April
    would consider that "drawdown" to be still continuing and to be $3 in
    amount, whereas if the net asset value per unit had increased by $2 in
    March, the January-February drawdown would have ended as of the end of
    February at the $2 level. The months during which the worst peak-to-valley
    drawdown occurred are set forth under "Worst Peak-to-Valley Drawdown."
 
10. "Compound Annual Rates of Return" are calculated in respect of each year by
    multiplying on a compound basis each of the monthly rates of return during
    the year (not shown), and not by adding or averaging such monthly rates of
    return. For the year in which a pool commenced operations and for 1998,
    "Compound Annual Rates of Return" reflect the compounded monthly rates of
    return (not shown) from the Start Date for, or the beginning of, such
    partial year.
 
11. Columbia was a publicly-offered fund with more than one advisor from its
    inception in July 1983 through January 1988, at which point it was changed
    to a publicly-offered fund with one advisor. Diversified's net asset value
    per unit was revalued from $3,964.23 to $1,000.00 after the close of
    business on August 31, 1995. All investors in Diversified prior to August
    31, 1995 had their units increased by a corresponding amount to reflect this
    revaluation, and all return calculations in the table have been adjusted
    accordingly. Multi-Market, formerly named Dean Witter Principal Guaranteed
    Fund L.P., was a publicly-offered fund with more than one advisor with
    principal protection from its inception in September 1988 through September
    30, 1993, at which point it was changed to a publicly-offered fund with one
    advisor without principal protection. Portfolio Strategy, formerly named
    Dean Witter Principal Secured Futures Fund L.P., was a publicly-offered fund
    with one advisor with principal protection from its inception in February
    1991 through July 31, 1996, at which point it was changed to a
    publicly-offered fund with one advisor without principal protection.
    Spectrum Global Balanced was formerly named Spectrum Balanced. Spectrum
    Select was formerly named Select Futures Fund; each unit of Select Futures
    Fund was converted into 100 units of Spectrum Select on April 30, 1998, with
    a corresponding revaluation of Net Asset Value per Unit from $2,008.20 to
    $20.08. Subscriptions for interests in Cornerstone II, Cornerstone III, and
    Cornerstone IV included an up-front 7.625% of net asset value selling
    commission and continuing offering expense charge until sales to new
    investors were terminated on September 30, 1994. Because sales occurred
    through the year and, therefore, the amount of the net asset value-based
    charge varied among investors, it was not practicable to include the
    up-front charge in determining the Cornerstone Funds' annual returns for the
    years 1993 and 1994. The performance record of Principal Plus includes the
    performance of Dean Witter Plus Fund Management L.P., an affiliated pool.
 
                                      S-10
<PAGE>
                              THE TRADING ADVISOR
 
    THE FOLLOWING UPDATES AND REPLACES TABLES A AND B ON PAGES 42-43 UNDER "THE
TRADING ADVISOR." THE NOTES TO SUCH TABLES ON PAGE 43 ARE AN INTEGRAL PART OF
THE TABLES. FOR PERFORMANCE INFORMATION FOR THE PARTNERSHIP, SEE PAGES S-2 TO
S-3.
 
                                    TABLE A
 
    Name of CTA: Morgan Stanley Commodities Management, Inc.
    Name of Program: MS Commodity Investment Portfolio Strategy
    Inception of Client Trading by CTA: February 1993
    Inception of Client Trading in Program: May 1994
    Number of Open Accounts: 3
    Aggregate Assets Overall: $248,200,000
    Aggregate Assets in Program: $247,700,000
    Largest Monthly % Drawdown: (5.86)%--(5/98)
    Largest Peak-to-Valley Drawdown: (18.30)%--(8/97-present)
 
<TABLE>
<CAPTION>
                                                                       1998       1997       1996       1995       1994
MONTHLY RATES OF RETURN                                                  %          %          %          %          %
- -------------------------------------------------------------------  ---------  ---------  ---------  ---------  ---------
<S>                                                                  <C>        <C>        <C>        <C>        <C>
January............................................................      (1.68)      1.35      (0.70)     (0.82)
February...........................................................      (5.48)      2.26       2.45       0.21
March..............................................................       0.43       1.30       3.93       1.69
April..............................................................      (1.73)      0.29       1.64       0.34
May................................................................      (5.86)      0.58      (0.99)     (1.17)      7.32
June...............................................................                 (2.24)      0.13      (0.36)      4.83
July...............................................................                  3.19      (0.12)      1.40       2.06
August.............................................................                 (1.59)      4.91       1.86      (0.82)
September..........................................................                  0.86      (0.95)      1.01       0.50
October............................................................                  0.49      (0.90)      0.46       0.38
November...........................................................                 (1.67)      2.36       1.49       1.88
December...........................................................                 (3.53)      2.45       5.53       1.35
Compound (period)
  Rate of Return...................................................     (13.65)      1.09      14.92      12.09      18.61
</TABLE>
 
        PAST PERFORMANCE IS NOT NECESSARILY INDICATIVE OF FUTURE RESULTS
 
                                    TABLE B
 
    Name of CTA: Morgan Stanley Commodities Management, Inc.
    Name of Program: MS Commodity Yield Fund Strategy
    Inception of Client Trading by CTA: February 1993
    Inception of Client Trading in Program: February 1993
    Number of Open Accounts: 1
    Aggregate Assets Overall: $248,200,000
    Aggregate Assets in Program: $500,000
    Largest Monthly % Drawdown: (8.07)%--(5/94)
    Largest Peak-to-Valley Drawdown: (16.58)%--(11/93-8/94)
    1998 year-to-date return (5 months): (2.23)%
    1997 annual return: (6.07)%
    1996 annual return: 16.33%
    1995 annual return: (3.26)%
    1994 annual return: (9.25)%
    1993 annual return (11 months): 16.20%
 
        PAST PERFORMANCE IS NOT NECESSARILY INDICATIVE OF FUTURE RESULTS
 
                                      S-11
<PAGE>
                               CERTAIN LITIGATION
 
    THE FOLLOWING UPDATES AND REPLACES THE INFORMATION IN THE THIRD AND FOURTH
PARAGRAPHS UNDER "CERTAIN LITIGATION" ON PAGE 44.
 
    On September 6, 10, and 20, 1996, and on March 13, 1997, similar purported
class actions were filed in the Superior Court of the State of California,
County of Los Angeles, on behalf of all purchasers of interests in limited
partnership commodity pools sold by DWR. Named defendants include DWR, Demeter,
Dean Witter Futures and Currency Management Inc., MSDW (all such parties
referred to hereafter as the "Dean Witter Parties"), certain limited partnership
commodity pools of which Demeter is the general partner, and certain trading
advisors to those pools. On June 16, 1997, the plaintiffs in the above actions
filed a consolidated amended complaint, alleging, among other things, that the
defendants committed fraud, deceit, negligent misrepresentation, various
violations of the California Corporations Code, intentional and negligent breach
of fiduciary duty, fraudulent and unfair business practices, unjust enrichment,
and conversion in the sale and operation of the various limited partnership
commodity pools. Similar purported class actions were also filed on September 18
and 20, 1996 in the Supreme Court of the State of New York, New York County, and
on November 14, 1996 in the Superior Court of the State of Delaware, New Castle
County, against the Dean Witter Parties and certain trading advisors on behalf
of all purchasers of interests in various limited partnership commodity pools
sold by DWR. A consolidated and amended complaint in the action pending in the
Supreme Court of the State of New York was filed on August 13, 1997, alleging
that the defendants committed fraud, breach of fiduciary duty, and negligent
misrepresentation in the sale and operation of the various limited partnership
commodity pools. On December 16, 1997, upon motion of the plaintiffs, the action
pending in the Superior Court of the State of Delaware was voluntarily dismissed
without prejudice. The complaints seek unspecified amounts of compensatory and
punitive damages and other relief. It is possible that additional similar
actions may be filed and that, in the course of these actions, other parties,
including the Partnership, could be added as defendants. The Dean Witter Parties
believe that they have strong defenses to, and they will vigorously contest, the
actions. Although the ultimate outcome of legal proceedings cannot be predicted
with certainty, it is the opinion of management of the Dean Witter Parties that
the resolution of the actions will not have a material adverse effect on the
financial condition or the results of operations of any of the Dean Witter
Parties.
 
    On October 25, 1996, the Market Surveillance Committee of the National
Association of Securities Dealers, Inc. ("NASD") filed a formal complaint
against MS & Co. and seven current and former traders, alleging violations of
certain NASD rules relating to manipulative and deceptive practices, locked and
crossed markets, and failure to supervise. Hearings were held in June and July
1997. On April 13, 1998, the Committee ruled that MS & Co. and the seven traders
had engaged in manipulative and deceptive practices and improperly locked or
crossed markets, but not that MS & Co. had failed to supervise its traders. The
Committee levied a fine of $1,000,000 on MS & Co., a fine of $100,000 and a
90-day suspension on one of its former traders, and fines of $25,000 and 30-day
suspensions on each of the remaining current and former traders. MS & Co. and
the traders have appealed the decision on the grounds, among others, that the
decision is not supported by the law or the facts and that it violates the
parties' due process rights. The sanctions will be abated during the pendency of
the appeal.
 
                              POTENTIAL ADVANTAGES
 
    THE FOLLOWING SUPPLEMENTS THE INFORMATION UNDER "POTENTIAL
ADVANTAGES--INVESTMENT DIVERSIFICATION" ON PAGES 64-69.
 
    The table below is an empirical example of how different asset classes can
react to business cycles. In each case, the asset class is represented by a
recognized industry index.
 
                                      S-12
<PAGE>
               ANNUAL RETURNS OF VARIOUS ASSET CLASSES OVER TIME
 
<TABLE>
<CAPTION>
                      U.S. TREASURY
                          BONDS
                         (LEHMAN         INT'L        MANAGED
                         BROTHERS       STOCKS        FUTURES
            STOCKS       TREASURY        (EAFE        (BARCLAY
           (S&P 500)   BOND INDEX)      INDEX)       CTA INDEX)
           ---------  --------------  -----------  --------------
               %            %              %             %
<S>        <C>        <C>             <C>          <C>
  1981         -5.0          1.14          -1.0          23.9
  1982         21.6         41.11          -0.9          16.7
  1983         22.5          1.80          24.6          23.8
  1984          6.2         14.68           7.9           8.7
  1985         31.7         32.01          56.7          25.5
  1986         18.6         24.15          70.0           3.8
  1987          5.2         -2.66          24.9          57.3
  1988         16.5          9.14          28.6          21.8
  1989         31.6         18.89          10.8           1.8
  1990         -3.1          4.56         -23.2          21.0
  1991         30.4         17.85          12.5           3.7
  1992          7.6          7.83         -11.8          -0.9
  1993         10.1         16.37          32.9          10.4
  1994          1.3         -6.92           8.1          -0.7
  1995         37.5         30.70          11.5          13.7
  1996         23.0         -0.41           6.4           9.2
  1997         33.4         14.87           2.1          10.2
</TABLE>
 
    The S&P 500 Index and EAFE Index performance data for stocks and
international stocks, respectively, are provided by Thomson Investment Software,
Rockville, MD. The Lehman Brothers Treasury Bond Index and the Barclay CTA Index
performance data for U.S. Treasury bonds and managed futures, respectively, are
provided by the Barclay Trading Group Ltd., Fairfield, IA. Performance of any of
these indices (which by definition are averages of many individual investments)
may not be representative of any specific investment within that index's asset
class.
 
    THE PERFORMANCE INFORMATION OF THE ASSET CLASSES ABOVE DOES NOT REFLECT THE
EFFECT OF FEES IDENTICAL TO THOSE TO BE PAID BY THE PARTNERSHIP, INCLUDING
MANAGEMENT, INCENTIVE, BROKERAGE AND SERVICE FEES. PAST PERFORMANCE IS NO
GUARANTEE OF FUTURE RESULTS. NOTE THAT WHILE THE BARCLAY CTA INDEX REFLECTS
RESULTS NET OF ACTUAL FEES AND EXPENSES, IT INCLUDES ACCOUNTS WITH TRADING
ADVISORS AND FEE STRUCTURES THAT DIFFER FROM PUBLIC MANAGED FUTURES FUNDS (SUCH
AS THE PARTNERSHIP). ALSO, THE PARTNERSHIP'S LONG-POSITION ONLY TRADING STRATEGY
IS DIFFERENT FROM THE TRADING STRATEGIES EMPLOYED BY THE TRADING ADVISORS
INCLUDED IN THE BARCLAY CTA INDEX, WHICH GENERALLY MAY GO LONG OR SHORT THE
FUTURES CONTRACTS TRADED, AND EMPLOY GREATER LEVERAGE. ACCORDINGLY, WHILE THE
BARCLAY CTA INDEX IS BELIEVED TO BE REPRESENTATIVE OF MANAGED FUTURES IN
GENERAL, THE PERFORMANCE OF PUBLIC MANAGED FUTURES FUNDS AS A SUBCLASS, OR
INDIVIDUALLY (IN PARTICULAR, THE PARTNERSHIP), MAY DIFFER. SEE "THE
PARTNERSHIP-- PERFORMANCE RECORD" ON PAGES S-2--S-3 FOR PERFORMANCE INFORMATION
ABOUT THE PARTNERSHIP.
 
                            ------------------------
 
    Over time, managed futures investments have demonstrated that they have the
potential to perform independently of traditional markets such as stocks and
bonds. The factors that influence the stock and bond markets can affect the
futures markets in different ways and to varying degrees. In this connection, an
article in the June 8, 1998 issue of BUSINESS WEEK, "Commodities Are Cheap--Time
to
 
                                      S-13
<PAGE>
Leap?" discusses the risks and potential rewards of investing in managed futures
funds, noting the low correlations of their performance to stocks and bonds.
 
                                    EXPERTS
 
    The statement of financial condition of Morgan Stanley Tangible Asset Fund
L.P. as of July 31, 1997 in the Prospectus, and the statements of financial
condition of Demeter Management Corporation as of November 30, 1997 and December
31, 1996 included in this Supplement have been audited by Deloitte & Touche LLP,
independent auditors, as indicated in their reports with respect thereto in the
Prospectus and this Supplement, and are included therein and herein in reliance
upon the authority of said firm as experts in accounting and auditing. Deloitte
& Touche LLP also acts as independent auditors for MSDW.
 
                                      S-14
<PAGE>
                    MORGAN STANLEY TANGIBLE ASSET FUND L.P.
 
                        STATEMENT OF FINANCIAL CONDITION
 
                                  (UNAUDITED)
 
<TABLE>
<CAPTION>
                                                                                                      MARCH 31,
                                                                                                         1998
                                                                                                    --------------
<S>                                                                                                 <C>
                                                                                                          $
ASSETS
Equity in Commodity futures trading accounts:
  Cash............................................................................................      31,821,345
  Net unrealized gain on open contracts...........................................................          97,560
                                                                                                    --------------
  Total Trading Equity............................................................................      31,918,905
Subscriptions receivable (Received $5,385,979)....................................................       5,385,979
Investment in U.S. Treasury Bills.................................................................       1,795,989
Interest receivable (MS & Co.)....................................................................         113,363
                                                                                                    --------------
    Total Assets..................................................................................      39,214,236
                                                                                                    --------------
                                                                                                    --------------
LIABILITIES AND PARTNERS' CAPITAL
Liabilities
  Accrued brokerage fees (MS & Co. and MSIL)......................................................         102,169
  Accrued management fee payable (MSCM)...........................................................          69,979
  Service fee payable (Demeter)...................................................................          27,991
                                                                                                    --------------
  Total Liabilities...............................................................................         200,139
                                                                                                    --------------
Partners' Capital
  Limited Partners (4,045,003.483 Units)..........................................................      38,599,988
  General Partner (43,395.648 Units)..............................................................         414,109
                                                                                                    --------------
  Total Partners' Capital.........................................................................      39,014,097
                                                                                                    --------------
  Total Liabilities and Partners' Capital.........................................................      39,214,236
                                                                                                    --------------
                                                                                                    --------------
NET ASSET VALUE PER UNIT                                                                                      9.54
                                                                                                    --------------
                                                                                                    --------------
</TABLE>
 
                The accompanying footnotes are an integral part
                         of these financial statements.
 
                                      S-15
<PAGE>
                    MORGAN STANLEY TANGIBLE ASSET FUND L.P.
 
                            STATEMENT OF OPERATIONS
 
                                  (UNAUDITED)
 
<TABLE>
<CAPTION>
                                                                                               FOR THE PERIOD FROM
                                                                                                 JANUARY 2, 1998
                                                                                                (COMMENCEMENT OF
                                                                                                 OPERATIONS) TO
                                                                                                 MARCH 31, 1998
                                                                                               -------------------
<S>                                                                                            <C>
                                                                                                        $
REVENUES
  Trading profit (loss):
    Realized.................................................................................         (1,378,000)
    Net change in unrealized.................................................................             97,560
                                                                                               -------------------
      Total Trading Results..................................................................         (1,280,440)
  Interest income (MS & Co.).................................................................            313,122
                                                                                               -------------------
      Total Revenues.........................................................................           (967,318)
                                                                                               -------------------
 
EXPENSES
  Brokerage fees (MS & Co. and MSIL).........................................................            277,573
  Management fee (MSCM)......................................................................            190,118
  Service fee (Demeter)......................................................................             76,047
                                                                                               -------------------
      Total Expenses.........................................................................            543,738
                                                                                               -------------------
 
NET LOSS.....................................................................................         (1,511,056)
                                                                                               -------------------
                                                                                               -------------------
 
NET LOSS ALLOCATION
  Limited Partner............................................................................         (1,475,165)
  General Partner............................................................................            (35,891)
 
NET LOSS PER UNIT
  Limited Partner............................................................................               (.46)
  General Partner............................................................................               (.46)
</TABLE>
 
                The accompanying footnotes are an integral part
                         of these financial statements.
 
                                      S-16
<PAGE>
                    MORGAN STANLEY TANGIBLE ASSET FUND L.P.
 
                   STATEMENT OF CHANGES IN PARTNERS' CAPITAL
 
                      FOR THE QUARTER ENDED MARCH 31, 1998
 
                                  (UNAUDITED)
 
<TABLE>
<CAPTION>
                                                       UNITS OF
                                                     PARTNERSHIP        LIMITED        GENERAL
                                                       INTEREST         PARTNERS       PARTNER        TOTAL
                                                   ----------------  --------------  -----------  --------------
<S>                                                <C>               <C>             <C>          <C>
Partners' Capital January 2, 1998................           200.000  $        1,000  $     1,000  $        2,000
Initial Offering.................................     2,573,486.803      25,475,868      259,000      25,734,868
Offering of Units................................     1,515,212.328      14,603,350      190,000      14,793,350
Net Loss.........................................         --             (1,475,165)     (35,891)     (1,511,056)
Redemptions......................................          (500.000)         (5,065)     --               (5,065)
                                                   ----------------  --------------  -----------  --------------
Partners' Capital March 31, 1998.................     4,088,399.131  $   38,599,988  $   414,109  $   39,014,097
                                                   ----------------  --------------  -----------  --------------
                                                   ----------------  --------------  -----------  --------------
</TABLE>
 
                The accompanying footnotes are an integral part
                         of these financial statements.
 
                                      S-17
<PAGE>
                    MORGAN STANLEY TANGIBLE ASSET FUND L.P.
 
                            STATEMENT OF CASH FLOWS
 
                                  (UNAUDITED)
 
<TABLE>
<CAPTION>
                                                                                               FOR THE PERIOD FROM
                                                                                                 JANUARY 2, 1998
                                                                                                (COMMENCEMENT OF
                                                                                                 OPERATIONS) TO
                                                                                                 MARCH 31, 1998
                                                                                               -------------------
<S>                                                                                            <C>
                                                                                                        $
CASH FLOWS FROM OPERATING ACTIVITIES
Net loss.....................................................................................         (1,511,056)
Noncash item included in net loss:
  Net change in unrealized...................................................................            (97,560)
Increase in operating assets:
  Investment in U.S. Treasury Bills..........................................................         (1,795,989)
  Interest receivable (MS & Co.).............................................................           (113,363)
Increase in operating liabilities:
  Accrued brokerage fees (MS & Co. and MSIL).................................................            102,169
  Accrued management fee payable (MSCM)......................................................             69,979
  Service fee payable (Demeter)..............................................................             27,991
                                                                                               -------------------
Net cash used for operating activities.......................................................         (3,317,829)
                                                                                               -------------------
CASH FLOWS FROM FINANCING ACTIVITIES
  Initial offering...........................................................................         25,734,868
  Offering of Units..........................................................................         14,793,350
  Increase in subscriptions receivable.......................................................         (5,385,979)
  Redemptions of units.......................................................................             (5,065)
                                                                                               -------------------
Net cash provided by financing activities....................................................         35,137,174
                                                                                               -------------------
Net increase in cash.........................................................................         31,819,345
Balance at beginning of period...............................................................              2,000
                                                                                               -------------------
Balance at end of period.....................................................................         31,821,345
                                                                                               -------------------
                                                                                               -------------------
</TABLE>
 
                The accompanying footnotes are an integral part
                         of these financial statements.
 
                                      S-18
<PAGE>
                    MORGAN STANLEY TANGIBLE ASSET FUND L.P.
 
                       FOOTNOTES TO FINANCIAL STATEMENTS
 
                                  (UNAUDITED)
 
    The financial statements include, in the opinion of management, all
adjustments necessary for a fair presentation of the results of operations and
financial condition of Morgan Stanley Tangible Asset Fund L.P. (the
"Partnership").
 
1. SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES
 
    ORGANIZATION--Morgan Stanley Tangible Asset Fund L.P. is a limited
partnership organized to engage primarily in speculative trading of futures
contracts in metals, energy and agricultural markets and commenced operations on
January 2, 1998. The general partner is Demeter Management Corporation
("Demeter"). The commodity brokers are Morgan Stanley & Co. Incorporated ("MS &
Co.") and Morgan Stanley & Co. International Limited ("MSIL"), (collectively,
the "Commodity Brokers"). The trading advisor is Morgan Stanley Commodities
Management, Inc. ("MSCM"). MSCM, the Commodity Brokers and Demeter are
wholly-owned subsidiaries of Morgan Stanley Dean Witter & Co. ("MSDW").
 
    Demeter is required to maintain a 1% minimum interest in the equity of the
Partnership and income (losses) are shared by the General and Limited Partners
based upon their proportional ownership interests.
 
    BASIS OF ACCOUNTING--The preparation of financial statements in conformity
with generally accepted accounting principles requires management to make
estimates and assumptions that affect the reported amounts in the financial
statements.
 
    REVENUE RECOGNITION--MS & Co. will credit the Partnership at each month-end
with interest income as if 80% of the Partnership's average daily Net Assets for
the month were invested at a rate based on U.S. Treasury Bills. For purposes of
such interest payments, Net Assets do not include monies due to the Partnership
on or with respect to futures interests but not actually received.
 
    NET INCOME (LOSS) PER UNIT--Net income (loss) per Unit is computed using the
weighted average number of units outstanding during the period.
 
    EQUITY IN COMMODITY FUTURES TRADING ACCOUNTS--The Partnership's asset
"Equity in Commodity futures trading accounts" consists of cash on deposit at MS
& Co. and MSIL to be used as margin for trading and the net asset or liability
related to unrealized gains or losses on open contracts.
 
    BROKERAGE AND RELATED TRANSACTION FEES AND COSTS--Brokerage fees are accrued
at a monthly rate of 1/12 of 3.65% of the Net Assets, as defined, as of the
first day of each month (a 3.65% annual rate). Such fees are for all costs of
executing trades by the Partnership, including floor brokerage fees, exchange
fees, clearing house fees, NFA fees, "give-ups" or transfer fees and any costs
associated with taking delivery of commodities.
 
    SERVICE FEE--The Partnership will pay Demeter a monthly service fee equal to
1/12 of 1% per month (a 1% annual rate) of the Partnership's Net Assets, as
defined, as of the first day of each month.
 
    OPERATING EXPENSES--The Partnership incurs monthly management fees and may
incur incentive fees as described in Note 2. All administrative expenses are
borne by Demeter.
 
    INCOME TAXES--No provision for income taxes has been made in the
accompanying financial statements, as partners are individually responsible for
reporting income or loss based upon their respective share of each Partnership's
revenues and expenses for income tax purposes.
 
                                      S-19
<PAGE>
                    MORGAN STANLEY TANGIBLE ASSET FUND L.P.
 
                 FOOTNOTES TO FINANCIAL STATEMENTS (CONTINUED)
 
                                  (UNAUDITED)
 
    DISTRIBUTIONS--Distributions, other than on redemption of Units, are made on
a pro-rata basis at the sole discretion of Demeter. No distributions have been
made to date.
 
    OFFERING OF UNITS--Units of limited partnership interest were offered to the
public at a price equal to 100% of the net asset value as of the close of
business on the last day of the month immediately preceding the four closings
held on January 2, February 2, March 2 and April 1, 1998.
 
    REDEMPTIONS--Limited Partners may redeem some or all of their Units at 100%
of the Net Asset Value Per Unit effective as of the last day of the sixth month
following the closing at which a person first becomes a Limited Partner, upon
five business days advance notice by redemption form to Demeter. Thereafter,
Units may be redeemed as of the end of any month upon five business days advance
notice by redemption form to Demeter. However, any Units redeemed at or prior to
the last day of the eleventh month after such Units were purchased will be
subject to a redemption charge equal to 2% of the Net Asset Value of a Unit on
the date of such redemption. Units redeemed after the last day of the eleventh
month and on or prior to the last day of the twenty-fourth month after which
such Units were purchased will be subject to a redemption charge equal to 1% of
the Net Asset Value per Unit on the date of such redemption. Units redeemed
after the last day of the twenty-fourth month after which such Units were
purchased will not be subject to a redemption charge. Limited Partners who
obtained their units via an exchange from another DWR-sponsored commodity pool
are not subject to the six month holding period or the redemption charges.
 
    DISSOLUTION OF THE PARTNERSHIP--The Partnership will terminate on December
31, 2027 or at an earlier date if certain conditions occur as defined in the
Partnership's Limited Partnership Agreement.
 
2. RELATED PARTY TRANSACTIONS
 
    The Partnership pays brokerage commissions to the Commodity Brokers and a
service fee to Demeter as described in Note 1. The Partnership's cash is on
deposit with MS & Co. and MSIL in commodity trading accounts to meet margin
requirements as needed. MS & Co. pays interest on these funds as described in
Note 1.
 
    Compensation to the Trading Advisor by the Partnership consists of a
management fee and an incentive fee as follows:
 
    MANAGEMENT FEE--The management fee is accrued at the rate of 5/24 of 1% of
the Net Assets on the first day of each month (a 2.5% annual rate).
 
    INCENTIVE FEE--The Partnership will pay an annual incentive fee equal to 20%
of the "Trading Profits" as defined as of the end of each calendar year. Such
incentive fee is accrued in each month in which "Trading Profits" occur. In
those months in which trading profits are negative, previous accruals, if any,
during the incentive period will be reduced. Any accrued incentive fees with
respect to Units redeemed at the end of a month that is not the end of a
calendar year will be deducted and paid to the Trading Advisor at the time of
such redemption.
 
3. FINANCIAL INSTRUMENTS
 
    The Partnership trades futures contracts in metals, energy and agricultural
markets. Futures and forwards represent contracts for delayed delivery of an
instrument at a specified date and price. Risk arises from changes in the value
of these contracts and the potential inability of counterparties to
 
                                      S-20
<PAGE>
                    MORGAN STANLEY TANGIBLE ASSET FUND L.P.
 
                 FOOTNOTES TO FINANCIAL STATEMENTS (CONTINUED)
 
                                  (UNAUDITED)
 
perform under the terms of the contracts. There are numerous factors which may
significantly influence the market value of these contracts, including interest
rate volatility. At March 31, 1998, open contracts were:
 
<TABLE>
<CAPTION>
                                                                                CONTRACT OR
                                                                              NOTIONAL AMOUNT
                                                                              MARCH 31, 1998
                                                                             -----------------
<S>                                                                          <C>
                                                                                     $
EXCHANGE-TRADED CONTRACTS
  Commodity Futures:
    Commitments to Purchase................................................        34,367,000
  Foreign Futures:
    Commitments to Purchase................................................         8,338,000
    Commitments to Sell....................................................         2,185,000
</TABLE>
 
    The net unrealized gain on open contracts is reported as a component of
"Equity in Commodity futures trading accounts" on the Statement of Financial
Condition and totaled $97,560 at March 31, 1998.
 
    Of the $97,560 net unrealized gain on open contracts at March 31, 1998, all
related to exchange-traded futures contracts.
 
    Exchange-traded futures contracts held by the Partnership at March 31, 1998
mature through December 1998.
 
    The contract amounts in the above table represent the Partnership's extent
of involvement in the particular class of financial instrument, but not the
credit risk associated with counterparty, nonperformance. The credit risk
associated with these instruments is limited to the amounts reflected in the
Partnership's Statement of Financial Condition.
 
    The Partnership also has credit risk because either MS & Co. or MSIL acts as
the futures commission merchant or the sole counterparty, with respect to most
of the Partnership's assets. Exchange-traded futures and options contracts are
marked to market on a daily basis, with variations in value settled on a daily
basis. MS & Co. and MSIL, as the futures commission merchants for all of the
Partnership's exchange-traded futures and options contracts, are required
pursuant to regulations of the Commodity Futures Trading Commission ("CFTC") to
segregate from their own assets and for the sole benefit of their commodity
customers, all funds held by them with respect to exchange-traded futures and
options contracts including an amount equal to the net unrealized gain on all
open futures and options contracts, which funds totaled $31,918,905 at March 31,
1998.
 
    For the quarter ended March 31, 1998, the average fair value of financial
instruments held for trading purposes was as follows:
 
<TABLE>
<CAPTION>
                                                                           MARCH 1998
                                                                   --------------------------
                                                                                  LIABILITIES
                                                                                  -----------
                                                                      ASSETS           $
                                                                   -------------
                                                                         $
<S>                                                                <C>            <C>
EXCHANGE-TRADED CONTRACTS
  Commodity Futures..............................................     29,771,000      --
  Foreign Futures................................................      6,488,000    1,142,000
</TABLE>
 
                                      S-21
<PAGE>
                          INDEPENDENT AUDITORS' REPORT
 
To the Board of Directors of
  Demeter Management Corporation:
 
We have audited the accompanying statements of financial condition of Demeter
Management Corporation (a wholly-owned subsidiary of Morgan Stanley, Dean
Witter, Discover & Co.) (the "Company") as of November 30, 1997 and December 31,
1996. These statements of financial condition are the responsibility of the
Company's management. Our responsibility is to express an opinion on these
statements of financial condition based on our audits.
 
We conducted our audits in accordance with generally accepted auditing
standards. Those standards require that we plan and perform the audit to obtain
reasonable assurance about whether the statements of financial condition are
free of material misstatement. An audit includes examining, on a test basis,
evidence supporting the amounts and disclosures in the statements of financial
condition. An audit also includes assessing the accounting principles used and
significant estimates made by management, as well as evaluating the overall
statement of financial condition presentation. We believe that our audits
provide a reasonable basis for our opinion.
 
In our opinion, such statements of financial condition present fairly, in all
material respects, the financial position of Demeter Management Corporation as
of November 30, 1997 and December 31, 1996 in conformity with generally accepted
accounting principles.
 
/s/ Deloitte & Touche LLP
January 12, 1998
New York, New York
 
                                      S-22
<PAGE>
                         DEMETER MANAGEMENT CORPORATION
 
    (WHOLLY-OWNED SUBSIDIARY OF MORGAN STANLEY, DEAN WITTER, DISCOVER & CO.)
 
                       STATEMENTS OF FINANCIAL CONDITION
 
<TABLE>
<CAPTION>
                                                                 FEBRUARY 28,
                                                                     1998         NOVEMBER 30,     DECEMBER 31,
                                                                  (UNAUDITED)         1997             1996
                                                                ---------------  ---------------  ---------------
<S>                                                             <C>              <C>              <C>
                                                                       $                $                $
ASSETS
 
Investments in affiliated partnerships (Note 2)...............       22,886,801       22,016,069       18,955,507
Income taxes receivable.......................................        --                 429,885        --
Receivable from affiliated partnership........................              965              968            1,049
                                                                ---------------  ---------------  ---------------
    Total Assets..............................................       22,887,766       22,446,922       18,956,556
                                                                ---------------  ---------------  ---------------
                                                                ---------------  ---------------  ---------------
 
LIABILITIES AND STOCKHOLDER'S EQUITY
LIABILITIES
  Payable to MSDWD (Note 3)...................................       17,808,977       17,995,100       15,762,235
  Income taxes payable........................................          188,052        --                 114,218
  Accrued expenses............................................           35,668           34,072           30,379
                                                                ---------------  ---------------  ---------------
    Total Liabilities.........................................       18,032,697       18,029,172       15,906,328
                                                                ---------------  ---------------  ---------------
STOCKHOLDER'S EQUITY
  Common stock, no par value:
    Authorized 1,000 shares; Issued and outstanding 100 shares
      at stated value of $500 per share.......................           50,000           50,000           50,000
  Additional paid-in capital..................................      111,170,000      111,170,000      111,170,000
  Retained earnings...........................................        4,705,069        4,267,750        2,899,724
                                                                ---------------  ---------------  ---------------
                                                                    115,925,069      115,487,750      114,119,724
  Less: Notes receivable from MSDWD (Note 4)..................     (111,070,000)    (111,070,000)    (111,070,000)
                                                                ---------------  ---------------  ---------------
    Total Stockholder's Equity................................        4,855,069        4,417,750        3,049,724
                                                                ---------------  ---------------  ---------------
    Total Liabilities and Stockholder's Equity................       22,887,766       22,446,922       18,956,556
                                                                ---------------  ---------------  ---------------
                                                                ---------------  ---------------  ---------------
</TABLE>
 
  The accompanying notes are an integral part of these statements of financial
                                   condition.
 
                                      S-23
<PAGE>
                         DEMETER MANAGEMENT CORPORATION
 
    [WHOLLY-OWNED SUBSIDIARY OF MORGAN STANLEY, DEAN WITTER, DISCOVER & CO.]
 
                   NOTES TO STATEMENTS OF FINANCIAL CONDITION
 
                 (THE INFORMATION RELATED TO 1998 IS UNAUDITED)
 
1. BUSINESS DESCRIPTION AND SIGNIFICANT ACCOUNTING POLICIES
 
    Demeter Management Corporation ("Demeter") is a wholly-owned subsidiary of
Morgan Stanley, Dean Witter, Discover & Co. ("MSDWD").
 
    On May 31, 1997, Morgan Stanley Group Inc. ("Morgan Stanley") was merged
with and into Dean Witter, Discover & Co. ("DWD"). At that time, DWD changed its
corporate name to Morgan Stanley, Dean Witter, Discover & Co. Prior to the
merger, DWD's fiscal year ended on December 31. Subsequent to the merger, MSDWD
and Demeter adopted a fiscal year end of November 30.
 
    Demeter manages the following commodity pools as their sole general partner:
Dean Witter Cornerstone Fund II, Dean Witter Cornerstone Fund III, Dean Witter
Cornerstone Fund IV, Columbia Futures Fund, Dean Witter Diversified Futures Fund
Limited Partnership, Dean Witter Diversified Futures Fund II L.P., Dean Witter
Diversified Futures Fund III L.P., Dean Witter Multi-Market Portfolio L.P.
(formerly Dean Witter Principal Guaranteed Fund L.P.), Dean Witter Principal
Plus Fund L.P. ("DWPPF"), Dean Witter Principal Plus Fund Management L.P., Dean
Witter Portfolio Strategy Fund L.P. (formerly Dean Witter Principal Secured
Futures Fund L.P.) ("DWPSF"), Dean Witter Select Futures Fund L.P. ("DWSFF"),
Dean Witter Global Perspective Portfolio L.P., Dean Witter World Currency Fund
L.P., Dean Witter Institutional Balanced Portfolio Account I L.P. ("DWIBP I"),
Dean Witter Institutional Account II L.P., DWFCM International Access Fund L.P.,
Dean Witter Anchor Institutional Balanced Portfolio Account L.P., ("Anchor"),
Dean Witter Spectrum Balanced L.P., Dean Witter Spectrum Strategic L.P., Dean
Witter Spectrum Technical L.P., DWR Chesapeake L.P., DWR Institutional Balanced
Portfolio Account III L.P., DWR/JWH Futures Fund L.P. ("DWR/JWH") and Morgan
Stanley Tangible Asset Fund L.P. ("MSTAF").
 
    Each of the commodity pools is a limited partnership organized to engage in
the speculative trading of commodity futures contracts, forward contracts on
foreign currencies and other commodity interests.
 
    In November of 1995, Demeter entered into a limited partnership agreement as
General Partner in DWR/JWH, which offered units to investors in an initial
private offering period ending January 31, 1996 and began trading on February 1,
1996. Demeter's initial investment in DWR/JWH was $75,000.
 
    Demeter terminated Dean Witter Principal Guaranteed Fund II L.P. ("DWPGF
II") as of March 31, 1996. DWPGF II was liquidated and holders of units as of
March 31, 1996 received a final distribution equal to the net asset value per
unit on that date multiplied by their respective number of units.
 
    On July 31, 1996, with the Net Asset Value of DWPSF above $1,000 per unit,
the letter of credit arrangement which assured investors who redeemed their
units on July 31, 1996 a minimum Net Asset Value of $1,000 per unit expired. On
August 1, 1996, that partnership was renamed "Dean Witter Portfolio Strategy
Fund L.P." and continued trading in a non-guaranteed format. As a result, both
the reduction of interest income of 1.125% per annum for the letter of credit
fee paid by Dean Witter Reynolds Inc. ("DWR") and the letter of credit fee of 1%
of new appreciation were eliminated.
 
    Demeter reopened DWSFF for additional investment and on August 13, 1996
DWSFF registered with the SEC 60,000 Units which was offered to investors for a
limited time in a public offering.
 
                                      S-24
<PAGE>
                         DEMETER MANAGEMENT CORPORATION
 
    [WHOLLY-OWNED SUBSIDIARY OF MORGAN STANLEY, DEAN WITTER, DISCOVER & CO.]
 
             NOTES TO STATEMENTS OF FINANCIAL CONDITION (CONTINUED)
 
                 (THE INFORMATION RELATED TO 1998 IS UNAUDITED)
 
    On August 20, 1996, Demeter ceased trading activities in DWIBP I and
distributed approximately 97% of DWIBP I's assets. At that time, there were open
forward positions maturing through December 1996. DWIBP I liquidated and
distributed its remaining assets in 1997.
 
    Demeter reopened DWPSF for additional investment and on May 12, 1997 DWPSF
registered with the SEC 50,000 units which were offered to investors for a
limited time in a public offering.
 
    On July 31, 1997, Demeter entered into a limited partnership agreement as
general partner in MSTAF. On November 11, 1997, MSTAF registered with the SEC
5,000,000 units to be offered to investors for a limited time in a public
offering.
 
    On September 18, 1997, Demeter ceased trading activities in Anchor and
distributed approximately 87% of Anchor's assets. Demeter distributed the
remainder of Anchor's assets in 1998.
 
    INCOME TAXES--The results of operations of Demeter are included in the
consolidated federal income tax return of MSDWD, computed on a separate company
basis and due to MSDWD.
 
    BASIS OF ACCOUNTING--The preparation of financial statements in conformity
with generally accepted accounting principles requires management to make
estimates and assumptions that affect the reported amounts in the financial
statements.
 
2. INVESTMENTS IN AFFILIATED PARTNERSHIPS
 
    The limited partnership agreement of each commodity pool requires Demeter to
maintain a general partnership interest in each partnership, generally in an
amount equal to, but not less than, 1 percent of the aggregate capital
contributed to the partnership by all partners.
 
    The total assets, liabilities and partners' capital of all the funds managed
by Demeter at February 28, 1998 (unaudited), November 30, 1997 and December 31,
1996 were as follows:
 
<TABLE>
<CAPTION>
                                                    FEBRUARY 28,
                                                        1998          NOVEMBER 30,      DECEMBER 31,
                                                    (UNAUDITED)           1997              1996
                                                  ----------------  ----------------  ----------------
<S>                                               <C>               <C>               <C>
                                                         $                 $                 $
Total assets....................................     1,254,721,181     1,195,307,516     1,084,660,072
Total liabilities...............................        18,807,828        19,346,113        27,893,698
Total partners' capital.........................     1,235,913,353     1,175,961,403     1,056,766,374
</TABLE>
 
    Demeter's investments in the above limited partnerships are carried at
market value with changes in such market value reflected currently in
operations.
 
3. PAYABLE TO MSDWD
 
    The payable to MSDWD is primarily for amounts due for the purchase of
partnership investments.
 
4. NET WORTH REQUIREMENT
 
    At February 28, 1998 (unaudited), November 30, 1997 and December 31, 1996,
Demeter held non-interest bearing notes from MSDWD that were payable on demand.
These notes were received in connection with additional capital contributions
aggregating $111,070,000.
 
                                      S-25
<PAGE>
                         DEMETER MANAGEMENT CORPORATION
 
    [WHOLLY-OWNED SUBSIDIARY OF MORGAN STANLEY, DEAN WITTER, DISCOVER & CO.]
 
             NOTES TO STATEMENTS OF FINANCIAL CONDITION (CONTINUED)
 
                 (THE INFORMATION RELATED TO 1998 IS UNAUDITED)
 
    The limited partnership agreement of each commodity pool requires Demeter to
maintain its net worth at an amount not less than 10% of the capital
contributions by all partners in each pool in which Demeter is the general
partner (15% if the capital contributions to any partnership are less than
$2,500,000, or $250,000, whichever is less].
 
    In calculating this requirement, Demeter's interests in each limited
partnership and any amounts receivable from or payable to such partnerships are
excluded from net worth. Notes receivable from MSDWD are included in net worth
for purposes of this calculation.
 
5. LEGAL MATTERS
 
    On September 6, 10, and 20, 1996, and on March 13, 1997, similar purported
class actions were filed in the Superior Court of the State of California,
County of Los Angeles, on behalf of all purchasers of interests in limited
partnership commodity pools sold by DWR, an affiliate of Demeter. Named
defendants include DWR, Demeter, Dean Witter Futures and Currency Management
Inc., MSDWD (all such parties referred to hereafter as the "Dean Witter
Parties"), certain limited partnership commodity pools of which Demeter is the
general partner, and certain trading advisors to those pools. On June 16, 1997,
the plaintiffs in the above actions filed a consolidated amended complaint.
Similar purported class actions were also filed on September 18 and 20, 1996 in
the Supreme Court of the State of New York, New York County, and on November 14,
1996 in the Superior Court of the State of Delaware, New Castle County, against
the Dean Witter Parties and certain trading advisors on behalf of all purchasers
of interests in various limited partnership commodity pools sold by DWR.
Generally, these complaints allege, among other things, that the defendants
committed fraud, deceit, misrepresentation, breach of fiduciary duty, fraudulent
and unfair business practices, unjust enrichment, and conversion in connection
with the sale and operation of the various limited partnership commodity pools.
The complaints seek unspecified amounts of compensatory and punitive damages and
other relief. It is possible that additional similar actions may be filed and
that, in the course of these actions, other parties could be added as
defendants. The Dean Witter Parties believe that they have strong defenses to,
and they will vigorously contest, the actions. Although the ultimate outcome of
legal proceedings cannot be predicted with certainty, it is the opinion of
management of the Dean Witter Parties that the resolution of the actions will
not have a material adverse effect on the financial condition or the results of
operations of any of the Dean Witter Parties.
 
6. SUBSEQUENT EVENTS (UNAUDITED)
 
    On March 24, 1998, Morgan Stanley, Dean Witter, Discover & Co. changed its
corporate name to Morgan Stanley Dean Witter & Co.
 
    On April 20, 1998, Dean Witter Spectrum Balanced L.P. changed its name to
Dean Witter Spectrum Global Balanced L.P. and Dean Witter Select Futures Fund
L.P. changed its name to Dean Witter Spectrum Select L.P.
 
    On May 11, 1998 Demeter registered with the SEC 5,000,000 additional units
of Dean Witter Spectrum Technical L.P. and 1,500,000 units of Dean Witter
Spectrum Select L.P., both of which are being offered to investors in a
continuing public offering with previously registered units of Dean Witter
Spectrum Strategic L.P. and Dean Witter Spectrum Global Balanced L.P.
 
                                      S-26
<PAGE>
                                                                         ANNEX A
 
                    MORGAN STANLEY TANGIBLE ASSET FUND L.P.
                    SUBSCRIPTION AND EXCHANGE AGREEMENT AND
                               POWER OF ATTORNEY
                               ------------------
 
                     UNITS OF LIMITED PARTNERSHIP INTEREST
 
    Subscribers purchasing Units for cash hereby are "Subscribers." Subscribers
who are redeeming units in another commodity pool for which the General Partner
serves as the general partner and commodity pool operator are "Exchange
Subscribers." Subscribers and Exchange Subscribers should follow the
instructions below.
 
                           SUBSCRIPTION INSTRUCTIONS
 
    ANY PERSON DESIRING TO SUBSCRIBE FOR UNITS SHOULD CAREFULLY READ AND REVIEW
THE PROSPECTUS DATED NOVEMBER 10, 1997 (THE "PROSPECTUS"), THE SUPPLEMENT TO THE
PROSPECTUS DATED JULY 10, 1998 (THE "SUPPLEMENT"), THE PARTNERSHIP'S MOST RECENT
MONTHLY REPORT, AND THIS SUBSCRIPTION AND EXCHANGE AGREEMENT AND POWER OF
ATTORNEY. BY SIGNING THIS SUBSCRIPTION AND EXCHANGE AGREEMENT AND POWER OF
ATTORNEY, A SUBSCRIBER OR EXCHANGE SUBSCRIBER WILL BE DEEMED TO MAKE EACH
APPLICABLE REPRESENTATION AND WARRANTY AND SATISFY ANY APPLICABLE SPECIAL STATE
SUITABILITY REQUIREMENT SET FORTH IN THIS AGREEMENT ON PAGES 4-6, SO PLEASE MAKE
SURE THAT YOU SATISFY ALL APPLICABLE PROVISIONS IN THOSE SECTIONS BEFORE SIGNING
THIS AGREEMENT.
 
    SUBSCRIBERS MUST FILL IN ALL OF THE BOXES AND BLANKS ONLY ON PAGES 9 AND 10,
AND EXCHANGE SUBSCRIBERS MUST FILL IN ALL OF THE BOXES AND BLANKS ONLY ON PAGES
11 and 12, USING BLACK INK, AS FOLLOWS:
 
<TABLE>
<S>        <C>        <C>
Item 1 (PAGE 9 OR PAGES 11-12)
 
              --      Enter Dean Witter Reynolds Inc. ("DWR") Account Number.
 
              --      Enter the Social Security Number or Taxpayer ID Number and check the
                      appropriate box to indicate the type of entity that is subscribing. In case of
                      joint ownership, either Social Security Number may be used.
 
              --      Each subscriber must (i) if a United States taxable subscriber, review the
                      representation relating to backup withholding tax under "United States Taxable
                      Investors Only" on page 9 (for Subscribers) or page 11 (for Exchange
                      Subscribers) or (ii) if a non-United States subscriber, review the
                      representation relating to such subscriber's classification as a non-resident
                      alien for United States federal income tax purposes under "Non-United States
                      Investors Only" on page 9 (for Subscribers) or page 11 (for Exchange
                      Subscribers). SUBSCRIBER(S) AND EXCHANGE SUBSCRIBER(S) MUST SIGN BELOW THE TAX
                      REPRESENTATION IN ITEM 1 ON PAGE 9 OR 11.
 
              --      Enter the exact name in which the Units are to be held based on ownership type,
                      and enter residency and other information.
 
              --      Enter taxable year of subscriber, if other than calendar year.
 
              --      Check box if the subscriber is a non-resident alien that is a dealer in
                      commodities or is otherwise engaged in a trade or business within the U.S.
</TABLE>
 
                                      A-1
<PAGE>
<TABLE>
<S>        <C>        <C>
              --      If there is a co-subscriber, trustee or custodian, complete applicable
                      information.
 
              --      Each subscriber purchasing Units as custodian for a minor: (i) if a gift to
                      minor not made with minor's funds, net worth and annual income representations
                      apply only to subscriber, or (ii) if not a gift, net worth and annual income
                      representations apply only to such minor.
 
              --      Each subscriber purchasing Units as a trustee or custodian of an employee
                      benefit plan with an individual beneficiary or of an individual retirement
                      account ("IRA") at the direction of the beneficiary of such plan or IRA: net
                      worth and annual income representations apply only to the beneficiary of such
                      plan or account.
 
For Signatories to Subscription Signature Page (PAGE 9)
 
              --      Enter the dollar amount of the subscription for the Partnership.
 
For Signatories to Exchange Signature Page (PAGE 11)
 
              --      Enter the symbol of the limited partnership from which units are to be
                      redeemed; specify the quantity to be redeemed (entire interest or number of
                      whole units).
</TABLE>
 
Item 2 (PAGE 10 OR 12)
 
<TABLE>
<S>        <C>        <C>
              --      Each subscriber must execute the Subscription and Exchange Agreement and Power
                      of Attorney Signature Page (on page 10 (for Subscribers) or page 12 (for
                      Exchange Subscribers)).
 
Item 3 (PAGE 10 OR 12)
 
              --      Financial Advisor and Branch Manager must complete the required information.
 
              --      The completed Subscription Signature Page or Exchange Signature Page, as
                      applicable, must be mailed to Dean Witter Reynolds Inc. at Two World Trade
                      Center, 62nd Floor, New York, New York 10048-0026.
</TABLE>
 
                                STATE CLEARANCES
 
    As of the date of the Supplement, the Units have been registered or are
otherwise qualified for offer and sale in all states (OTHER THAN MINNESOTA), the
District of Columbia and Puerto Rico, subject to the special suitability and
minimum investment requirements for certain states set forth under "State
Suitability Requirements" on pages 5 and 6. Units may be offered and sold in
Minnesota, in reliance upon an exemption from registration, solely to
Subscribers and Exchange Subscribers who qualify as "accredited investors"
within the meaning of Rule 501(a) of SEC Regulation D, or who otherwise qualify
as institutional investors within the meaning of the Minnesota exemption.
 
                                      A-2
<PAGE>
                    MORGAN STANLEY TANGIBLE ASSET FUND L.P.
                                ---------------
 
           SUBSCRIPTION AND EXCHANGE AGREEMENT AND POWER OF ATTORNEY
 
    Any person subscribing for Units of Limited Partnership Interest ("Units")
in Morgan Stanley Tangible Asset Fund L.P. (the "Partnership") should carefully
read and review the Partnership's Prospectus dated November 10, 1997 (the
"Prospectus"), the Supplement to the Prospectus dated July 10, 1998 (the
"Supplement"), and the Partnership's most recent Monthly Report (the "Monthly
Report"; except as otherwise indicated herein, the term "Prospectus" shall mean
the Prospectus, as amended and supplemented by the Supplement and the Monthly
Report). Capitalized terms used below and not defined in this Subscription and
Exchange Agreement and Power of Attorney ("Agreement") are defined (and
described in detail) in the Prospectus.
 
    FOR SIGNATORIES TO SUBSCRIPTION SIGNATURE PAGE:  By executing the Signature
Page of this Agreement, the undersigned Subscriber ("Subscriber") irrevocably
subscribes for Units at the price per Unit described in the Prospectus.
 
    FOR SIGNATORIES TO EXCHANGE SIGNATURE PAGE:  By executing the Signature Page
of this Agreement, the undersigned Subscriber ("Subscriber") irrevocably redeems
the units of limited partnership interest in the limited partnership indicated
on the signature page of this Agreement and, with the proceeds of such
redemption, hereby irrevocably subscribes for Units at the price per Unit
described in the Prospectus.
 
    NOTWITHSTANDING THE FOREGOING, SUBSCRIBER MAY REVOKE THIS AGREEMENT, AND
RECEIVE A FULL REFUND OF THE SUBSCRIPTION AMOUNT AND ANY ACCRUED INTEREST
THEREON (OR REVOKE THE REDEMPTION OF UNITS IN THE OTHER LIMITED PARTNERSHIP IN
THE CASE OF AN EXCHANGE), WITHIN FIVE BUSINESS DAYS AFTER EXECUTION OF THIS
AGREEMENT OR NO LATER THAN 3:00 P.M., NEW YORK CITY TIME, ON THE DATE OF THE
CLOSING, WHICHEVER COMES FIRST, BY DELIVERING WRITTEN NOTICE TO SUBSCRIBER'S DWR
FINANCIAL ADVISOR. If this Agreement is accepted, Subscriber agrees to
contribute Subscriber's subscription to the Partnership and to be bound by the
terms of the Partnership's Amended and Restated Limited Partnership Agreement,
included as Exhibit A to the Prospectus (the "Limited Partnership Agreement").
BY EXECUTION OF THE SIGNATURE PAGE ATTACHED HERETO, SUBSCRIBER SHALL BE DEEMED
TO HAVE EXECUTED THIS AGREEMENT AND THE LIMITED PARTNERSHIP AGREEMENT (INCLUDING
THE POWERS OF ATTORNEY HEREIN AND THEREIN).
 
- --------------------------------------------------------------------------------
PAYMENT INSTRUCTIONS
- --------------------------------------------------------------------------------
 
    FOR SIGNATORIES TO SUBSCRIPTION SIGNATURE PAGE:  Payment of this
subscription must be made by charging the Subscriber's Customer Account with
DWR. In the event that the Subscriber does not have a Customer Account or does
not have sufficient funds in Subscriber's existing Customer Account, the
Subscriber should make appropriate arrangements with Subscriber's DWR financial
advisor, if any, and if none, should contact Subscriber's local DWR branch
office. If Subscriber is a customer of another broker-dealer acting as an
Additional Seller of the Units, such Additional Seller will assist Subscriber in
opening a DWR Customer Account. Payment must NOT be mailed to the General
Partner at its offices in New York City. Any such payment will not be accepted
by the General Partner and will be returned to the Subscriber for proper
placement with the DWR branch office where Subscriber's Customer Account is
maintained. The undersigned Subscriber hereby authorizes and directs the General
Partner and DWR to transfer the appropriate amount from the Customer Account to
the Escrow Account.
 
    FOR SIGNATORIES TO EXCHANGE SIGNATURE PAGE:  Payment of this subscription
must be made by applying the proceeds from a redemption of limited partnership
units in another commodity pool for which the General Partner serves as the
general partner and commodity pool operator. Subscriber may only redeem units at
such times as are specified in the applicable limited partnership agreement for
such other commodity pool, and under certain circumstances described therein
Subscriber may be subject to a redemption charge.
 
                                      A-3
<PAGE>
- --------------------------------------------------------------------------------
 
REPRESENTATIONS AND WARRANTIES
- --------------------------------------------------------------------------------
 
    Subscriber (for myself/ourselves, and, if Subscriber is an entity, on behalf
of and with respect to such entity and its shareholders, partners, or
beneficiaries) hereby represents and warrants to the General Partner and the
Partnership as follows:
 
        (1) Subscriber has received a copy of the Prospectus, which includes the
    Limited Partnership Agreement, as well as a copy of the Supplement and the
    Partnership's most recent Monthly Report.
 
        (2) Subscriber is of legal age to execute this Agreement and is legally
    competent to do so.
 
        (3) Subscriber has either: (a) net worth of at least $75,000 (exclusive
    of home, furnishings, and automobiles); or (b) net worth of at least $30,000
    (exclusive of home, furnishings, and automobiles) and annual gross income of
    at least $30,000. However, if Subscriber is a resident and/ or subject to
    regulation by one of the states which imposes more restrictive suitability
    requirements than the foregoing, or requires a higher minimum investment, as
    set forth below under the caption "State Suitability Requirements."
    Subscriber's net worth and/or income and investment satisfies the
    requirements of such state. (If Units are being purchased by spouses as
    joint owners, their joint net worth and annual income may be used to satisfy
    applicable state suitability requirements.) Subscriber agrees to provide any
    additional documentation requested by the General Partner, as may be
    required by the securities administrators of certain states to confirm that
    Subscriber meets the applicable minimum financial suitability standards to
    invest in the Partnership.
 
        (4) The address set forth on the Signature Page is Subscriber's true and
    correct residence and Subscriber has no present intention of becoming a
    resident of any other state or country. All the information that is provided
    on the Signature Page regarding Subscriber is correct and complete as of the
    date of this Agreement, and, if there should be any material change in such
    information prior to Subscriber's admission as a Limited Partner, Subscriber
    will immediately furnish such revised or corrected information to the
    General Partner.
 
        (5) If Subscriber is an employee benefit plan, to the best of
    Subscriber's knowledge, neither the General Partner, DWR, the Trading
    Advisor, nor any of their respective affiliates either: (a) has investment
    discretion with respect to the investment of Subscriber's plan assets; (b)
    has authority or responsibility to or regularly gives investment advice with
    respect to such plan assets for a fee and pursuant to an agreement or
    understanding that such advice will serve as a primary basis for investment
    decisions with respect to such plan assets and that such advice will be
    based on the particular investment needs of the plan; or (c) is an employer
    maintaining or contributing to such plan. For purposes hereof, an "employee
    benefit plan" shall include plans and accounts of various types (including
    their related trusts) which provide for the accumulation of a portion of an
    individual's earnings or compensation as well as investment income earned
    thereon free from federal income tax until such time as funds are
    distributed from the plan, and include corporate "pension" and
    profit-sharing plans, "simplified employee pension plans," "Keogh" plans for
    self-employed individuals, and IRAs.
 
        (6) Unless (7) or (8) below is applicable, Subscriber's subscription is
    made with Subscriber's funds for Subscriber's own account and not as
    trustee, custodian, or nominee for another.
 
        (7) The subscription, if made as custodian for a minor, is a gift
    Subscriber has made to such minor and is not made with such minor's funds
    or, if not a gift, the representations as to net worth and annual income set
    forth herein apply only to such minor.
 
        (8) If Subscriber is subscribing as a trustee or custodian of an
    employee benefit plan or of an IRA at the direction of the beneficiary of
    the plan or IRA, the representations set forth above apply only to the
    beneficiary of such plan or IRA.
 
                                      A-4
<PAGE>
        (9) If Subscriber is subscribing in a representative capacity,
    Subscriber has full power and authority to purchase the Units and enter into
    and be bound by this Agreement on behalf of the entity for which Subscriber
    is purchasing the Units, and such entity has full right and power to
    purchase such Units and enter into and be bound by this Agreement and become
    a Limited Partner pursuant to the Limited Partnership Agreement.
 
        (10) Subscriber either is not required to be registered with the
    Commodity Futures Trading Commission ("CFTC") or to be a member of the
    National Futures Association ("NFA"), or, if so required, is duly registered
    with the CFTC and is a member in good standing of the NFA. It is an NFA
    requirement that the General Partner attempt to verify that any person or
    entity that seeks to purchase Units be duly registered with the CFTC and a
    member of the NFA, if required. Subscriber agrees to supply the General
    Partner with such information as the General Partner may reasonably request
    in order to attempt such verification. Certain entities that acquire Units
    may, as a result, themselves become "commodity pools" within the intent of
    applicable CFTC and NFA rules, and their sponsors, accordingly, may be
    required to register as "commodity pool operators."
 
ADDITIONAL REPRESENTATION AND WARRANTY FOR EXCHANGE SUBSCRIBERS ONLY:
 
        (11) Subscriber is the true, lawful, and beneficial owner of the units
    of limited partnership interest (or fractions thereof) to be redeemed
    pursuant to this Agreement, with full power and authority to request
    redemption and a subsequent purchase of Units. The units of limited
    partnership interest (or fraction thereof) which are the subject of this
    redemption request are not subject to any pledge or otherwise encumbered in
    any fashion.
 
    By making the representations and warranties set forth above, Subscribers
should be aware that they have not waived any rights of action which they may
have under applicable federal or state securities laws. Federal and state
securities laws provide that any such waiver would be unenforceable. Subscribers
should be aware, however, that the representations and warranties set forth
above may be asserted in the defense of the Partnership, the General Partner,
the Trading Advisor, DWR, or others in any subsequent litigation or other
proceeding.
 
- --------------------------------------------------------------------------------
 
STATE SUITABILITY REQUIREMENTS
- --------------------------------------------------------------------------------
 
    Except as indicated below, investors in the Partnership must have a net
worth (exclusive of home, furnishings, and automobiles) of at least $75,000 or,
failing that standard, have a net worth (same exclusions) of at least $30,000
and an annual gross income of at least $30,000, and must make a minimum
aggregate investment of $5,000, or $2,000 in the case of IRAs, or, in the case
of an Exchange, the lesser of (i) $5,000 ($2,000 in the case of an IRA), (ii)
the proceeds from the redemption of five units (two units in the case of an IRA)
from commodity pools other than the Spectrum Series, (iii) the proceeds from the
redemption of 500 units (200 units in the case of an IRA) from one, or any
combination, of the Spectrum Series of commodity pools, or (iv) the proceeds
from the redemption of all of the Subscriber's units of limited partnership
interest in any other commodity pool for which the General Partner serves as
general partner and commodity pool operator. However, the states listed below
have more restrictive suitability or minimum investment requirements for
Subscribers residing therein. Please read the following list to make sure that
Subscriber meets the suitability and/or investment requirements for the state in
which Subscriber resides. (As used below, "NW" means net worth exclusive of
home, furnishings, and automobiles; "AI" means annual gross income; and "TI"
means annual taxable income for federal income tax purposes.)
 
                                      A-5
<PAGE>
    ALABAMA:  (a) $150,000 NW, or (b) $45,000 NW and $45,000 AI.
 
    ARIZONA:  (a) $150,000 NW, or (b) $45,000 NW and $45,000 AI.
 
    ARKANSAS:  (a) $150,000 NW, or (b) $45,000 NW and $45,000 AI.
 
    CALIFORNIA:  (a) $150,000 NW, or (b) $75,000 NW and $50,000 AI.
 
    IOWA:  (1) The minimum initial investment for IRAs is $2,500; and (2) the
    Subscriber has at least (a) $225,000 NW, or (b) $60,000 NW and $60,000 TI.
 
    KANSAS:  (a) $150,000 NW, or (b) $45,000 NW and $45,000 AI.
 
    KENTUCKY:  (a) $150,000 NW, or (b) $45,000 NW and $45,000 AI.
 
    MAINE:  (a) $200,000 NW, or (b) $50,000 NW and $50,000 AI.
 
    MASSACHUSETTS:  (a) $225,000 NW, or (b) $60,000 NW and $60,000 AI.
 
    MICHIGAN:  (a) $225,000 NW and investment may not exceed 10% of NW, or (b)
    $60,000 NW and $60,000 AI and investment may not exceed 10% of NW.
 
    MISSOURI:  (a) $225,000 NW, or (b) $60,000 NW and $60,000 AI.
 
    NEBRASKA:  (a) $150,000 NW, or (b) $45,000 NW and $45,000 AI.
 
    NEW MEXICO:  (a) $150,000 NW, or (b) $45,000 NW and $45,000 AI.
 
    NORTH CAROLINA:  (a) $225,000 NW, or (b) $60,000 NW and $60,000 AI.
 
    NORTH DAKOTA:  (a) $150,000 NW, or (b) $45,000 NW and $45,000 AI.
 
    OHIO:  (a) $150,000 NW and investment may not exceed 10% of NW, or (b)
    $45,000 NW and $45,000 AI and investment may not exceed 10% of NW.
 
    OKLAHOMA:  (a) $150,000 NW, or (b) $45,000 NW and $45,000 AI.
 
    OREGON:  (a) $150,000 NW, or (b) $45,000 NW and $45,000 AI.
 
    PENNSYLVANIA:  (a) $175,000 NW and investment may not exceed 10% of NW, or
    (b) $100,000 NW and $50,000 TI and investment may not exceed 10% of NW.
 
    SOUTH DAKOTA:  (a) $150,000 NW, or (b) $45,000 NW and $45,000 AI.
 
    TENNESSEE:  (a) $225,000 NW, or (b) $60,000 NW and $60,000 AI.
 
    TEXAS:  (a) $225,000 NW, or (b) $60,000 NW and $60,000 TI.
 
    WASHINGTON:  (a) $150,000 NW, or (b) $45,000 NW and $45,000 AI.
 
                                      A-6
<PAGE>
- --------------------------------------------------------------------------------
 
SIGNIFICANT DISCLOSURES
- --------------------------------------------------------------------------------
 
    Subscriber should read the Prospectus, the Supplement and the Monthly Report
in their entirety before completing this Agreement and subscribing for Units,
and should carefully consider the information contained therein as well as the
following information (which is set forth in detail in the Prospectus)
concerning an investment in the Partnership:
 
        (1) The General Partner, DWR, Morgan Stanley & Co. Incorporated ("MS &
    Co."), Morgan Stanley & Co. International Limited ("MSIL"), the
    Partnership's commodity brokers, and Morgan Stanley Commodities Management,
    Inc., the Partnership's trading advisor, are each wholly-owned subsidiaries
    of Morgan Stanley Dean Witter & Co., and conflicts of interest therefore
    exist. The principal business address of the General Partner is Two World
    Trade Center, 62nd Floor, New York, New York 10048.
 
        (2) MS & Co. and MSIL will receive substantial commodity brokerage fees
    from the Partnership, and will also realize the benefits of excess interest
    earned on the Partnership's funds and compensating balance benefits from
    deposits of the Partnership's funds, and MS & Co. will pay a portion of such
    amounts to DWR, all subject to certain limitations, as described in the
    Prospectus. A Limited Partner will consent to the execution and delivery by
    the General Partner on behalf of the Partnership of the Customer Agreements
    with MS & Co. and MSIL, and to the payment to MS & Co., MSIL, and DWR of
    such fees and benefits.
 
        (3) The performance information in the Prospectus should be read only in
    conjunction with the textual description and notes thereto, and such data
    should not be interpreted to mean that the Partnership will have similar
    results or will realize any profits whatsoever. A Limited Partner will be
    deemed to have consented to the execution and delivery by the General
    Partner on behalf of the Partnership of the Management Agreement with the
    Trading Advisor (as described in the Prospectus), and with such other
    trading advisors as the General Partner may retain from time to time.
 
        (4) Units cannot be transferred or assigned except as set forth in the
    Limited Partnership Agreement. Units may be redeemed at the option of a
    Limited Partner as of, but not before, the sixth month end following the
    closing at which such person first became a Limited Partner. Thereafter,
    Units may be redeemed as of the end of any month. However, any Units
    redeemed at the end of the sixth or at or prior to the end of the eleventh
    or twenty-fourth month after which such Units were purchased will be
    assessed a redemption charge equal to 2% or 1%, respectively, of the Net
    Asset Value of a Unit on the date of such redemption. The foregoing charges
    will be paid to DWR. A limited partner in any of the other commodity pools
    for which the General Partner serves as the general partner and commodity
    pool operator who redeemed all or a portion of his interest in one of such
    other partnerships on or after March 31, 1997, and purchases Units will not
    be subject to the foregoing redemption charges or restrictions under the
    circumstances described below. The number of Units, expressed as a
    percentage of Units purchased, which are not subject to a redemption charge
    is determined by dividing (a) the dollar amount received upon redeeming an
    interest in such other partnership and used to purchase Units by (b) the
    total investment in the Partnership. Subscribers who purchase $500,000 or
    more of Units will not be subject to the redemption charges described above.
    Units may only be redeemed upon 5 business days' written notice to the
    General Partner prior to the effective date of a redemption, which will be
    the last day of a calendar month.
 
        (5) All subscriptions are subject to acceptance or rejection by the
    General Partner in whole or in part for any reason and are irrevocable by
    Subscribers, subject to the limited revocation right described on page 3 of
    this Agreement.
 
                                      A-7
<PAGE>
- --------------------------------------------------------------------------------
 
ACCEPTANCE OF THE LIMITED PARTNERSHIP AGREEMENT
- --------------------------------------------------------------------------------
 
    Subscriber hereby agrees that as of the date that Subscriber's name is
entered on the books of the Partnership, Subscriber shall become a Limited
Partner of the Partnership. Subscriber hereby agrees to each and every term of
the Limited Partnership Agreement as if Subscriber's signature were subscribed
thereto. Subscriber further agrees that DWR may receipt on Subscriber's behalf
for the Units purchased by Subscriber hereunder upon the issuance of such Units
by the Partnership (although no certificate evidencing Unit(s) will be issued to
Subscriber).
 
- --------------------------------------------------------------------------------
 
POWER OF ATTORNEY AND GOVERNING LAW
- --------------------------------------------------------------------------------
 
    Subscriber hereby irrevocably constitutes and appoints Demeter Management
Corporation, the General Partner of the Partnership, as Subscriber's true and
lawful Attorney-in-Fact, with full power of substitution, in Subscriber's name,
place, and stead, to do all things necessary to admit Subscriber as a Limited
Partner of the Partnership and to admit others as additional or substituted
Limited Partners to the Partnership so long as such admission is in accordance
with the terms of the Limited Partnership Agreement or any amendment thereto, to
file, prosecute, defend, settle, or compromise any and all actions at law or
suits in equity for or on behalf of the Partnership in connection with any
claim, demand, or liability asserted or threatened by or against the
Partnership, and to execute, acknowledge, swear to, deliver, file, and record on
Subscriber's behalf and as necessary in the appropriate public offices, and
publish: (a) the Limited Partnership Agreement and the Certificate of Limited
Partnership and all amendments thereto permitted by the terms thereof; (b) all
instruments that the General Partner deems necessary or appropriate to reflect
any amendment, change, or modification of the Limited Partnership Agreement or
the Certificate of Limited Partnership made in accordance with the terms of the
Limited Partnership Agreement; (c) certificates of assumed name; and (d) all
instruments that the General Partner deems necessary or appropriate to qualify
or maintain the qualification of the Partnership to do business as a foreign
limited partnership in other jurisdictions. Subscriber agrees to be bound by any
representation made by the General Partner or any successor thereto acting in
good faith pursuant to this Power of Attorney.
 
    The Power of Attorney granted hereby shall be deemed to be coupled with an
interest and shall be irrevocable and survive the death, incapacity,
dissolution, liquidation, or termination of the Subscriber.
 
    THIS SUBSCRIPTION AND EXCHANGE AGREEMENT AND POWER OF ATTORNEY SHALL BE
GOVERNED BY AND INTERPRETED IN ACCORDANCE WITH THE LAWS OF THE STATE OF NEW
YORK; PROVIDED, HOWEVER, THAT THIS PROVISION SHALL NOT BE DEEMED A WAIVER OF ANY
RIGHTS OF ACTION SUBSCRIBER MAY HAVE UNDER APPLICABLE FEDERAL OR STATE
SECURITIES LAW.
 
- --------------------------------------------------------------------------------
 
RECEIPT OF DOCUMENTATION
- --------------------------------------------------------------------------------
 
    The regulations of the Commodity Futures Trading Commission require that the
undersigned Subscriber be given copies of the Prospectus, the Supplement, and
the most current monthly account statement (report) for the Partnership. The
undersigned hereby acknowledges receipt of the Prospectus, the Supplement, and
the Monthly Report.
 
                                      A-8
<PAGE>
                    MORGAN STANLEY TANGIBLE ASSET FUND L.P.
                     UNITS OF LIMITED PARTNERSHIP INTEREST
                          SUBSCRIPTION SIGNATURE PAGE
                   PLEASE PRINT OR TYPE. USE BLACK INK ONLY.
    PAGES 9 AND 10, THE SUBSCRIPTION SIGNATURE PAGE, SHOULD BE DELIVERED TO THE
LOCAL DEAN WITTER BRANCH OFFICE AND MUST BE RECEIVED BY THE GENERAL PARTNER AT
TWO WORLD TRADE CENTER, 62ND FLOOR, NEW YORK, NEW YORK 10048-0026, AT LEAST FIVE
BUSINESS DAYS PRIOR TO THE CLOSING.
    The Subscriber named below, by execution and delivery of this Signature Page
and by payment of the purchase price for Units of
Limited Partnership Interest ("Units") in Morgan Stanley Tangible Asset Fund
L.P. (the "Partnership"), hereby subscribes for Units at the applicable Closing,
at a price equal to 100% of the Net Asset Value as of the close of business on
the last day of the month immediately preceding the Closing, all as described in
the Prospectus. Unless otherwise provided under "State Suitability
Requirements," the minimum investment in the Partnership is $5,000 or $2,000 in
the case of IRAs. Existing Limited Partners who desire to make an additional
investment in the Partnership may subscribe for Units at a subsequent Closing
with a minimum investment of $1,000.
 
    BY SUCH EXECUTION AND PAYMENT, THE SUBSCRIBER ACKNOWLEDGES RECEIPT OF THE
PROSPECTUS OF THE PARTNERSHIP DATED NOVEMBER 10, 1997, THE SUPPLEMENT THERETO
DATED JULY 10, 1998, AND THE PARTNERSHIP'S MOST RECENT MONTHLY REPORT
(COLLECTIVELY, THE "PROSPECTUS"), INCLUDING THE LIMITED PARTNERSHIP AGREEMENT
AND THIS SUBSCRIPTION AND EXCHANGE AGREEMENT AND POWER OF ATTORNEY, THE TERMS OF
WHICH GOVERN THE INVESTMENT IN THE UNITS BEING SUBSCRIBED FOR HEREBY.
 
- --------------------------------------------------------------------------------
ITEM 1 -- SUBSCRIBER (SUBSCRIBER MUST SIGN BELOW TAX REPRESENTATION)
- --------------------------------------------------------------------------------
 
<TABLE>
<S>            <C>                                               <C>                        <C><C>                               <C>
DWR ACCOUNT NO.                                                            MSTAF            $
</TABLE>
 
<TABLE>
<CAPTION>
                             -                      AMOUNT OF SUBSCRIPTION
<S>                                  <C>  <C>                                  <C>  <C>
TAXABLE INVESTORS                                                                   NON-TAXABLE INVESTORS
 / / / / / / -- / / / / -- / / / / / / / / OR  / / / / -- / / / / / / / / / / / / / OR / / / / / / / / / / / / / / / / / / / / / /
Social Security Number of: (check one)    Taxpayer ID Number for: (check one)     Soc. Sec. #/Taxpayer ID # for: (check
                                                                                                                   one)
/ / Individual Ownership                  / /Trust other than Grantor or            / /IRA (the DWR Branch Manager must
                                                 Revocable Trust                           sign below for IRA accounts)
/ /Joint Tenants with Rights of
       Survivorship                       / / Estate                                / /Employee Benefit Plan
                                                                                    (Participant
/ / Tenants in Common                     / /UGMA/UTMA (Minor)                             Directed)
/ / Community Property                    / / Partnership                           / / Defined Benefit Plan (Other)
/ /Grantor or other Revocable Trust       / / Corporation                           / / Other (specify)
</TABLE>
 
      ALL SUBSCRIBERS (OR BRANCH MANAGERS IN THE CASE OF AN IRA) MUST SIGN
 
<TABLE>
<S>                                                      <C>   <C>
 UNITED STATES TAXABLE INVESTORS:                        OR     NON-UNITED STATES INVESTORS
 / / Check box if Subscriber is subject to backup               Under penalties of perjury, by signature below, the
     withholding under the provisions of Section                Subscriber certifies that such Subscriber is NOT
     3406(a)(1)(C) of the Internal Revenue Code.                (a) a citizen or resident of the United
If Subscriber's taxable year is other than the calendar            States;
 year, indicate the date on which                               (b) or, a United States corporation, partnership,
    Subscriber's taxable year                                       estate or trust.
 ends  ...............................................
 Under penalties of perjury, by signing below, I
 certify that the Social Security Number (or Taxpayer
 ID Number) above to be the true, correct and complete
 Social Security Number (or Taxpayer ID Number) and
 that all the information above is true, correct and
 complete.
 X
</TABLE>
 
<TABLE>
<S>                        <C>                                                                     <C>              <C>
(Signature of Subscriber or Officer, Partner or Trustee of Subscriber or Branch Manager            Date
in the case of an IRA)
 
If Subscriber is an        Type or Print Name of Entity: .........................................................
Entity:
 
                           Name: ................................................................  Date: .........
 
                           Title: ................................................................................
 
Full Name of Account..............................................................................................
                           (Subscriber's Name or Name of Trust or Custodial Account--do not use initials)
 
Subscriber is a resident of  ........................  and a citizen of  ........................
                           (name of country)                            (name of country)
 
Street Address ...................................................................................................
                           (MUST be residence address--P.O. Box alone not acceptable)
 
City  ...................  State  .............  Zip Code  .............  Tel. No. ( ............. )  ............
</TABLE>
 
/ / Check here if Subscriber is a non-resident alien individual, foreign
corporation, foreign partnership, foreign trust or foreign estate
that is a dealer in commodities or otherwise engaged in a trade or business
within the U.S.A. to which income, gain or loss from the
Partnership would be treated as effectively connected. (Subscriber must complete
Form W-8 which may be obtained from DWR Financial Advisor.)
 
                                      A-9
<PAGE>
COMPLETE, IF APPLICABLE (MUST BE COMPLETED IF THERE IS A CO-SUBSCRIBER, TRUSTEE
                                 OR CUSTODIAN):
 
<TABLE>
<S>                                                    <C>
Name .................................................. Telephone Number ( ................. ) ................
The person or entity above is a/an (check one)
</TABLE>
 
<TABLE>
<S>                                  <C>                                  <C>
 / / Co-Subscriber                    / / Trustee or Custodian             / / Authorized Person, if an
                                                                           Institutional Trustee
</TABLE>
 
Street Address .................................................................
 
                               (P. O. Box alone not acceptable)
 
<TABLE>
<S>                                                           <C>
City .......................................................  State  .....................  Zip Code  ....................
 
Co-Subscriber, Trustee or Custodian is a resident of .......  and a citizen of ...........................................
 
Minor (if not a gift) is a resident of .....................  and a citizen of ...........................................
</TABLE>
 
- --------------------------------------------------------------------------------
ITEM 2 -- SIGNATURE(S)--SUBSCRIBER(S) MUST SIGN UNDER TAX REPRESENTATION ON
PRECEDING PAGE AND BELOW
- --------------------------------------------------------------------------------
 
(INDIVIDUAL OR JOINT SUBSCRIPTION, INCLUDING PARTICIPANT-DIRECTED EMPLOYEE
BENEFIT PLAN OR IRA SUBSCRIPTION)
 
If this subscription is for a joint or community property account, the
statements, representations, and warranties set forth in this Subscription and
Exchange Agreement and Power of Attorney shall be deemed to have been made by
each owner of the account.
 
*   If the Units will be owned by joint owners, tenants in common, or as
community property, signatures of all owners are required.
 
*   In the case of a participant-directed employee benefit plan or IRA, the
    beneficiary must sign immediately below and the trustee or custodian must
    sign below under "Entity Subscription".
 
<TABLE>
<S>                                             <C>              <C>                                             <C>
X                                                                X
(Signature of Subscriber)                       Date             (Signature of Co-Subscriber)                    Date
</TABLE>
 
(ENTITY SUBSCRIPTION)
 
ACCEPTANCE OF SUBSCRIPTION ON BEHALF OF EMPLOYEE BENEFIT PLANS (INCLUDING IRAS)
IS IN NO RESPECT A REPRESENTATION BY THE GENERAL PARTNER OR DWR THAT THIS
INVESTMENT MEETS ALL RELEVANT LEGAL REQUIREMENTS WITH RESPECT TO INVESTMENTS BY
ANY PARTICULAR PLAN, OR THAT THIS INVESTMENT IS APPROPRIATE FOR ANY PARTICULAR
PLAN.
 
The undersigned corporate officer, partner or trustee hereby certifies and
warrants that s/he has full power and authority from or on behalf of the entity
named below and its shareholders, partners, or beneficiaries to complete,
execute and deliver this Subscription and Exchange Agreement and Power of
Attorney on their behalf and to make the statements, representations, and
warranties made herein on their behalf, and that investment in the Partnership
is authorized under applicable law and the governing documents of the entity,
has been affirmatively authorized by the governing board or body, if any, of the
entity, and is legally permissible.
 
<TABLE>
<S>                             <C>
 .............................                               X
(Type or Print Name of Entity)  (Signature)                                                 Date
 
Print Name  ..................  Title  .......................
</TABLE>
 
- --------------------------------------------------------------------------------
ITEM 3 -- BRANCH MANAGER AND FINANCIAL ADVISOR USE ONLY (COMPLETED IN FULL AND
IN INK)
- --------------------------------------------------------------------------------
 
<TABLE>
<S>                                                         <C>
 THE UNDERSIGNED FINANCIAL ADVISOR HEREBY CERTIFIES THAT:      THE FINANCIAL ADVISOR MUST SIGN BELOW IN ORDER TO
 (1) the above signature(s) is/are true and correct;           SUBSTANTIATE COMPLIANCE WITH NASD CONDUCT RULE 2810.
 (2) s/he has informed the Subscriber about the liquidity      X ........................................................
     and marketability of the Units as set forth in the                          FINANCIAL ADVISOR'S SIGNATURE
     Prospectus;                                               ..........................................................
 (3) based on information obtained from the Subscriber                  Type or Print Full Name of Financial Advisor
     concerning this Subscriber's investment objectives,       Telephone
     other investments, financial situation, needs and any     Number  ( ............. ) ...................................
     other relevant information, that s/he reasonably          THE UNDERSIGNED BRANCH MANAGER HEREBY CERTIFIES THAT:
     believes that:                                            (1) the above signature(s) is/are true and correct.
   (a) such Subscriber is or will be in a financial position   (2) the above client(s) is/are suitable.
       appropriate to enable such Subscriber to realize the    X
       benefits of the Partnership as described in the         BRANCH MANAGER'S SIGNATURE
 Prospectus;                                                    .........................................................
   (b) such Subscriber has a net worth sufficient to sustain   Type or Print Full Name of Branch Manager
       the risk inherent in the Partnership (including loss
       of investment and lack of liquidity); and
   (c) the Partnership is otherwise a suitable investment
       for such Subscriber; and
 (4) the Subscriber received the Prospectus at least five
     business days prior to the Closing.
</TABLE>
 
  Please drop a BUY ticket upon receipt of a completed Subscription Agreement.
 
                                      A-10
<PAGE>
                    MORGAN STANLEY TANGIBLE ASSET FUND L.P.
                     UNITS OF LIMITED PARTNERSHIP INTEREST
                            EXCHANGE SIGNATURE PAGE
                   PLEASE PRINT OR TYPE. USE BLACK INK ONLY.
    PAGES 11 AND 12, THE EXCHANGE SIGNATURE PAGE, SHOULD BE DELIVERED TO THE
LOCAL DEAN WITTER BRANCH OFFICE AND MUST BE RECEIVED BY THE GENERAL PARTNER AT
TWO WORLD TRADE CENTER, 62ND FLOOR, NEW YORK, NEW YORK 10048-0026, AT LEAST FIVE
BUSINESS DAYS PRIOR TO THE CLOSING.
    The Subscriber named below, by execution and delivery of this Signature
Page, hereby redeems the units of limited partnership interest of the limited
partnership identified in Item 1 below and, by application of the proceeds of
such redemption to the payment of the purchase price for Units of Limited
Partnership Interest ("Units") in Morgan Stanley Tangible Asset Fund L.P.
("MSTAF" or the "Partnership"), hereby subscribes for Units at the applicable
Closing, at a price equal to 100% of the Net Asset Value as of the close of
business on the last day of the month immediately preceding the Closing, all as
described in the Prospectus. Redemption of units of any partnership for an
exchange must be in whole units, unless Subscriber is redeeming its entire
interest in such partnership.
    BY SUCH EXECUTION AND PAYMENT, THE SUBSCRIBER ACKNOWLEDGES RECEIPT OF THE
PROSPECTUS OF THE PARTNERSHIP DATED NOVEMBER 10, 1997, THE SUPPLEMENT THERETO
DATED JULY 10, 1998, AND THE PARTNERSHIP'S MOST RECENT MONTHLY REPORT
(COLLECTIVELY, THE "PROSPECTUS"), INCLUDING THE LIMITED PARTNERSHIP AGREEMENT
AND THIS SUBSCRIPTION AND EXCHANGE AGREEMENT AND POWER OF ATTORNEY, THE TERMS OF
WHICH GOVERN THE INVESTMENT IN THE UNITS BEING SUBSCRIBED FOR HEREBY.
 
<TABLE>
<S>        <C>                                        <C>        <C>                                        <C>
</TABLE>
 
- --------------------------------------------------------------------------------
ITEM 1 -- SUBSCRIBER (SUBSCRIBER MUST SIGN BELOW TAX REPRESENTATION)
- --------------------------------------------------------------------------------
 
<TABLE>
<S>            <C>
DWR ACCOUNT NO.
</TABLE>
 
                                -
 
<TABLE>
<S>                                                       <C>
SYMBOL FOR FUND FROM WHICH                                   SPECIFY QUANTITY OF UNITS TO BE REDEEMED
UNITS TO BE REDEEMED                                              (CHECK BOX IF ENTIRE INTEREST;
                                                                   INSERT NUMBER IF WHOLE UNITS)
</TABLE>
 
/ / / / / / / / / /                            / /  ENTIRE INTEREST  OR
- -
- ---------------
- ---------------
- - WHOLE UNITS  TO
- - MSTAF
- -
- -------------------------------------------------------------------------
- -------------------------------------------------------------------------
 
The Subscriber hereby authorizes Demeter Management Corporation to redeem the
above quantity of units of limited partnership interest set forth opposite the
symbol of the partnership identified on the left above at the "Net Asset Value"
thereof, as defined in the limited partnership agreement of such partnership,
less any redemption charges, and to utilize the net proceeds thereof to purchase
Units in MSTAF as indicated. The Subscriber may redeem either (a) whole units of
limited partnership interest, with a minimum redemption equal to the lesser of
(i) $5,000 ($2,000 in the case of an IRA), (ii) the proceeds from the redemption
of a minimum of 5 units (2 units in the case of an IRA) from a partnership other
than those in the Dean Witter Spectrum Series ("Spectrum"), or (iii) the
proceeds from the redemption of 500 units (200 units in the case of an IRA) from
one, or any combination, of Spectrum partnerships; or (b) his entire interest in
a partnership.
 
<TABLE>
<CAPTION>
<S>                                  <C>  <C>                                  <C>  <C>
 TAXABLE INVESTORS                                                                  NON-TAXABLE INVESTORS
 / / / / / / -- / / / / -- / / / / / / / / OR  / / / / -- / / / / / / / / / / / / / OR / / / / / / / / / / / / / / / / / / / / / /
Social Security Number of: (check one)    Taxpayer ID Number for: (check one)     Soc. Sec. #/Taxpayer ID # for: (check
                                                                                                                   one)
/ /  Individual Ownership                 / /  Trust other than Grantor or          / /  IRA (the DWR Branch Manager
                                                   Revocable Trust                       must  sign below for IRA
/ /  Joint Tenants with Rights of                                                        accounts)
         Survivorship                     / /  Estate
                                                                                    / /  Employee Benefit Plan
/ /  Tenants in Common                    / /  UGMA/UTMA (Minor)                    (Participant-
                                                                                             Directed)
/ /  Community Property                   / /  Partnership
                                                                                    / /  Defined Benefit Plan (Other)
/ /  Grantor or other Revocable           / /  Corporation
     Trust                                                                          / /  Other (specify)
</TABLE>
 
      ALL SUBSCRIBERS (OR BRANCH MANAGERS IN THE CASE OF AN IRA) MUST SIGN
 
<TABLE>
<S>                                                    <C>     <C>
 UNITED STATES TAXABLE INVESTORS                       OR       NON-UNITED STATES INVESTORS
 / / Check box if Subscriber is subject to backup               Under penalties of perjury, by signature below, the
     withholding under the provisions of Section                Subscriber certifies that such Subscriber is NOT
     3406(a)(1)(C) of the Internal Revenue Code.                (a) a citizen or resident of the United
If Subscriber's taxable year is other than the calendar            States;
 year, indicate the date on which                               (b) or, a United States corporation, partnership,
    Subscriber's taxable year                                       estate or trust.
 ends  ...............................................
 Under penalties of perjury, by signing below, I
 certify that the Social Security Number (or Taxpayer
 ID Number) above to be the true, correct and complete
 Social Security Number (or Taxpayer ID Number) and
 that all the information above is true, correct and
 complete.
 X
 (Signature of Subscriber or Officer, Partner or                                        Date
 Trustee of Subscriber [or Branch Manager in the case
 of an IRA])
</TABLE>
 
<TABLE>
<S>                        <C>                                                                                       <C>
If Subscriber is an Entity: Type or Print Name of Entity:  ...........................................................
 
                           Name:  ...................................... Date: ......................................
 
                           Title:  ..................................................................................
</TABLE>
 
                                      A-11
<PAGE>
 
<TABLE>
<S>                 <C>
Full Name of Account ....................................................................................................
                    (Subscriber's Name or Name of Trust or Custodial Account--do not use initials)
Subscriber is a resident of ........................................... and a citizen of ...........................................
                                        (name of country)                                            (name of country)
Street Address ....................................................................................................................
                                   (MUST be residence address -- P. O. Box alone not acceptable)
</TABLE>
 
<TABLE>
<S>                                                         <C>            <C>            <C>
City........................................................ State.......... Zip Code....... Tel. No. ( ....... ) ......
</TABLE>
 
/ /  Check here if Subscriber is a non-resident alien individual, foreign
corporation, foreign partnership, foreign trust or foreign estate that is a
dealer in commodities or otherwise engaged in a trade or business within the
U.S.A. to which income, gain or loss from the Partnership would be treated as
effectively connected. (Subscriber must complete Form W-8 which may be obtained
from DWR Financial Advisor.)
 
COMPLETE, IF APPLICABLE (MUST BE COMPLETED IF THERE IS A CO-SUBSCRIBER, TRUSTEE
                                 OR CUSTODIAN):
 
Name  ............... Telephone Number ( ......... )  ..........................
                   The person or entity above is a/an (check
           one)
 
<TABLE>
<S>                           <C>                           <C>
                                                             / /  Authorized Person, if an
 / /  Co-Subscriber            / /  Trustee or Custodian     Institutional Trustee
</TABLE>
 
Street Address  ................................................................
                            (P. O. Box alone not acceptable)
 
<TABLE>
<S>                                                                                                 <C>            <C>
City................................................................................................ State.......... Zip Code.......
</TABLE>
 
Co-Subscriber, Trustee or Custodian
is a resident of................... and a citizen of...................
 
Minor (if not a gift) is a resident
of................................. and a citizen of...................
 
- --------------------------------------------------------------------------------
ITEM 2 -- SIGNATURE(S)--SUBSCRIBER(S) MUST SIGN UNDER TAX REPRESENTATION ON
PRECEDING PAGE AND BELOW
- --------------------------------------------------------------------------------
 
(INDIVIDUAL OR JOINT SUBSCRIPTION, INCLUDING PARTICIPANT-DIRECTED EMPLOYEE
BENEFIT PLAN OR IRA SUBSCRIPTION)
 
If this subscription is for a joint or community property account, the
statements, representations, and warranties set forth in this Subscription and
Exchange Agreement and Power of Attorney shall be deemed to have been made by
each owner of the account.
 
*   If the Units will be owned by joint owners, tenants in common, or as
community property, signatures of all owners are required.
 
*   In the case of a participant-directed employee benefit plan or IRA, the
    beneficiary must sign immediately below and the trustee or custodian must
    sign below under "Entity Subscription".
 
<TABLE>
<S>                                      <C>                   <C>                                      <C>
                   X                                                              X
       (Signature of Subscriber)                 Date               (Signature of Co-Subscriber)                Date
</TABLE>
 
(ENTITY SUBSCRIPTION)
 
    ACCEPTANCE OF SUBSCRIPTION ON BEHALF OF EMPLOYEE BENEFIT PLANS (INCLUDING
IRAS) IS IN NO RESPECT A REPRESENTATION BY THE GENERAL PARTNER OR DWR THAT THIS
INVESTMENT MEETS ALL RELEVANT LEGAL REQUIREMENTS WITH RESPECT TO INVESTMENTS BY
ANY PARTICULAR PLAN, OR THAT THIS INVESTMENT IS APPROPRIATE FOR ANY PARTICULAR
PLAN.
 
    The undersigned corporate officer, partner or trustee hereby certifies and
warrants that s/he has full power and authority from or on behalf of the entity
named below and its shareholders, partners, or beneficiaries to complete,
execute and deliver this Subscription and Exchange Agreement and Power of
Attorney on their behalf and to make the statements, representations, and
warranties made herein on their behalf, and that investment in the Partnership
is authorized under applicable law and the governing documents of the entity,
has been affirmatively authorized by the governing board or body, if any of the
entity, and is legally permissible.
 
<TABLE>
<S>                                                    <C>
 ....................................................... X .....................................................
(Type or Print Name of Entity)                         (Signature)                          Date
Print Name ............................................ Title .................................................
</TABLE>
 
- --------------------------------------------------------------------------------
ITEM 3 -- BRANCH MANAGER AND FINANCIAL ADVISOR USE ONLY (COMPLETED IN FULL AND
IN INK)
- --------------------------------------------------------------------------------
 
<TABLE>
<S>                                           <C>        <C>
 The undersigned Financial Advisor hereby                 THE FINANCIAL ADVISOR MUST SIGN BELOW IN
 certifies that:                                          ORDER TO SUBSTANTIATE COMPLIANCE WITH NASD
 (1) the above signature(s) is/are true and                           CONDUCT RULE 2810.
     correct;                                                                 X
 (2) s/he has informed the Subscriber about                     FINANCIAL ADVISOR'S SIGNATURE
     the liquidity and marketability of the               ..................................................
     Units as set forth in the Prospectus;                          ......................
 (3) based on information obtained from the                 Type or Print Full Name of Financial
     Subscriber concerning this Subscriber's                               Advisor
     investment objectives, other                                         Telephone
     investments, financial situation, needs               Number  ( ............. )  ............
     and any other relevant information,                  .......................
     that s/he reasonably believes that:                    THE UNDERSIGNED BRANCH MANAGER HEREBY
   (a) such Subscriber is or will be in a                              CERTIFIES THAT:
       financial position appropriate to                 (1) the above signature(s) is/are true and
       enable such Subscriber to realize the                                correct.
       benefits of the Partnership as                     (2) the above client(s) is/are suitable.
       described in the Prospectus;                                           X
   (b) such Subscriber has a net worth                           BRANCH MANAGER'S SIGNATURE
sufficient to sustain the risk inherent in                 .........................................
the Partnership (including loss of                        Type or Print Full Name of Branch Manager
investment and lack of liquidity); and
   (c) the Partnership is otherwise a
       suitable investment for such
       Subscriber; and
 (4) the Subscriber received the Prospectus
     at least five business days prior to
     the Closing.
</TABLE>
 
   Please drop an EXG ticket upon receipt of a completed Exchange Agreement.
 
                                      A-12


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