INSURED MUNICIPAL SECURITIES TRUST 22ND DISCOUNT SERIES
485B24E, 1994-10-25
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     As filed with the Securities and Exchange Commission on October 25, 1994
                                                    Registration No. 33-07253 *
                                                                              


                        SECURITIES AND EXCHANGE COMMISSION
                              Washington, D.C. 20549
                                    __________

                          POST-EFFECTIVE AMENDMENT NO. 8
                                        To
                                     FORM S-6
                                    __________

                     FOR REGISTRATION UNDER THE SECURITIES ACT
                     OF 1933 OF SECURITIES OF UNIT INVESTMENT
                         TRUSTS REGISTERED ON FORM N-8B-2

    A.  Exact name of trust:

               INSURED MUNICIPAL SECURITIES TRUST, 22ND DISCOUNT SERIES, 23RD
               DISCOUNT SERIES, 24TH DISCOUNT SERIES, 25TH DISCOUNT SERIES AND
               26TH DISCOUNT SERIES

    B.  Name of depositor:

               BEAR, STEARNS & CO. INC.

    C.  Complete address of depositor's principal executive office:

               245 Park Avenue
               New York, New York 10167

    D.  Name and complete address of agent for service:

               PETER J. DeMARCO              Copy of comments to:
               Managing Director             MICHAEL R. ROSELLA, ESQ.
               Bear, Stearns & Co. Inc.      Battle Fowler
               245 Park Avenue               75 East 55th Street
               New York, NY 10167            New York, NY 10022
                                             (212) 856-6858

    E.    Title and amount of securities being registered:**

          INSURED MUNICIPAL SECURITIES TRUST: 23rd Discount, 1053; 24th
          Discount, 1089; 25th Discount, 1462; and 26th Discount, 972.

    F.    Proposed maximum aggregate offering price to the public of the
          securities being registered:  23rd Discount, $290,609.18; 24th
          Discount, $290,432.52; 25th Discount, $291,738.36; and 26th
          Discount, $290,320.74.***

    G.    Amount of filing fee:  23rd Discount, $100.00; 24th Discount,
          $100.00; 25th Discount, $100.36; and 26th Discount, $100.00.***

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

    / /  immediately upon filing pursuant to paragraph (b) of Rule 485.
    /X/  on (October 28, 1994) pursuant to paragraph (b) of Rule 485.
    / /  60 days after filing pursuant to paragraph (a) of Rule 485.
    / /  on (       date       ) pursuant to paragraph (a) of Rule 485.
                                                                              

    *     The Prospectus included in this Registration constitutes a combined
          Prospectus as permitted by the Provisions of Rule 429 of the General
          Rules and Regulations under the Securities Act of 1933.  Said
          Prospectus covers units of undivided interest in Insured Municipal
          Securities Trust, 22nd Discount Series, 23rd Discount Series, 24th
          Discount Series, 25th Discount Series and 26th Discount Series
          covered by prospectuses heretofore filed as part of separate
          registration statements on Form S-6 (Registration Nos. 33-07253, 33-
          07769, 33-08700, 33-09512 and 33-10166, respectively) under the
          Securities Act.  This filing constitutes Post-Effective Amendment
          No. 8 for all of the aforementioned Series. 

    **    Representing additional Units registered for purposes of resale in
          the secondary market by the Depositor.

    ***   Estimated solely for purposes of calculating filing fee pursuant to
          Section 24(e)(1) of the Investment Company Act and Rule 24e-2
          thereunder.  Total amount of the Units redeemed or repurchased for
          each series during previous fiscal year, all of which are being used
          to reduce filing fee:  23rd Discount, 496 ($521.74); 24th Discount,
          497 ($590.31); 25th Discount, 964 ($585.82); and 26th Discount, 450
          ($556.17).
        
    <PAGE>




                        INSURED MUNICIPAL SECURITIES TRUST
                   22ND DISCOUNT SERIES, 23RD DISCOUNT SERIES, 
         24TH DISCOUNT SERIES, 25TH DISCOUNT SERIES, 26TH DISCOUNT SERIES


                               CROSS-REFERENCE SHEET

                       Pursuant to Rule 404 of Regulation C
                         under the Securities Act of 1933

                   (Form N-8B-2 Items required by Instruction as
                          to the Prospectus in Form S-6)


                 Form N-8B-2                                   Form S-6
                 Item Number                            Heading in Prospectus


                     I.  Organization and General Information

  
   1.  (a)  Name of trust...................  Front Cover of Prospectus
       (b)  Title of securities issued......    "
   2.  Name and address of each depositor..   The Sponsor
   3.  Name and address of trustee.........   The Trustee
   4.  Name and address of principal
       underwriters......................     The Sponsor
   5.  State of organization of trust......   Organization
   6.  Execution and termination of
       trust agreement...................     Trust Agreement, Amendment and
                                                Termination
   7.  Changes of name.....................   Not Applicable
   8.  Fiscal year.........................     "
   9.  Litigation..........................   None


         II.  General Description of the Trust and Securities of the Trust

  10.  (a) Registered or bearer
            securities......................  Certificates
       (b) Cumulative or distributive
            securities......................  Interest and Principal
                                              Distributions
       (c) Redemption......................   Trustee Redemption
       (d) Conversion, transfer, etc.......   Certificates, Sponsor
                                              Repurchase,
                                                Trustee Redemption, Exchange
                                                Privilege and Conversion Offer
       (e) Periodic payment plan...........   Not Applicable
       (f) Voting rights...................   Trust Agreement, Amendment and
                                                Termination
       (g)  Notice to certificateholders....  Records, Portfolio, Trust
                                              Agreement,
                                                Amendment and Termination, The
                                                Sponsor, The Trustee
       (h)  Consents required...............  Trust Agreement, Amendment and
                                                Termination
       (i)  Other provisions................  Tax Status
  11.  Type of securities
       comprising units..................     Objectives, Portfolio,
                                              Description
                                                of Portfolio
  12.  Certain information regarding
       periodic payment certificates.....     Not Applicable
  13.  (a)  Load, fees, expenses, etc.......  Summary of Essential
                                              Information,
                                                Offering Price, Volume and
                                              Other
                                                Discounts, Sponsor's and
                                                Underwriters' Profits, Total
                                                Reinvestment Plan, Trust
                                              Expenses
                                                and Charges
       (b)  Certain information regarding
            periodic payment certificates...  Not Applicable
       (c)  Certain percentages.............  Summary of Essential
                                              Information,
                                                Offering Price, Total
                                              Reinvestment
                                                Plan
       (d)  Price differences...............  Volume and Other Discounts
       (e)  Other loads, fees, expenses.....  Certificates
       (f)  Certain profits receivable
            by depositors, principal
            underwriters, trustee or
            affiliated persons..............  Sponsor's and Underwriters'
                                              Profits
       (g)  Ratio of annual charges
            to income.......................  Not Applicable
  14.  Issuance of trust's securities......   Organization, Certificates
  15.  Receipt and handling of payments
       from purchasers...................     Organization
  16.  Acquisition and disposition of
       underlying securities.............     Organization, Objectives,
                                              Portfolio,
                                                Portfolio Supervision
  17.  Withdrawal or redemption............   Comparison of Public Offering
                                              Price,
                                                Sponsor's Repurchase Price and
                                                Redemption Price, Sponsor
                                                Repurchase, Trustee Redemption
  18.  (a)  Receipt, custody and
            disposition of income...........  Distribution Elections, Interest
                                              and
                                                Principal Distributions,
                                              Records,
                                                Total Reinvestment Plan
       (b)  Reinvestment of distributions...  Total Reinvestment Plan
       (c)  Reserves or special funds.......  Interest and Principal
                                              Distributions
       (d)  Schedule of distributions.......  Not Applicable
  19.  Records, accounts and reports.......   Records, Total Reinvestment Plan
  20.  Certain miscellaneous provisions
       of trust agreement................     Trust Agreement, Amendment and
                                                Termination
       (a)  Amendment.......................    "
       (b)  Termination.....................    "
       (c)  and (d) Trustee, removal and
            successor.......................  The Trustee
       (e)  and (f) Depositor, removal
            and successor...................  The Sponsor
  21.  Loans to security holders...........   Not Applicable
  22.  Limitations on liability............   The Sponsor, The Trustee,
                                                The Evaluator
  23.  Bonding arrangements................   Part II--Item A
  24.  Other material provisions
       of trust agreement................     Not Applicable


         III.  Organization, Personnel and Affiliated Persons of Depositor

  25.  Organization of depositor...........   The Sponsor
  26.  Fees received by depositor..........   Not Applicable
  27.  Business of depositor...............   The Sponsor
  28.  Certain information as to
       officials and affiliated
       persons of depositor..............     Part II--Item C
  29.  Voting securities of depositor......   Not Applicable
  30.  Persons controlling depositor.......     "
  31.  Payments by depositor for certain
       services rendered to trust........       "
  32.  Payment by depositor for certain
       other services rendered to trust..       "
  33.  Remuneration of employees of
     depositor for certain services
     rendered to trust...................       "
  34.  Remuneration of other persons for
     certain services rendered to trust..       "


                  IV.  Distribution and Redemption of Securities

  35.  Distribution of trust's
       securities by states..............     Distribution of Units
  36.  Suspension of sales of
       trust's securities................     Not Applicable
  37.  Revocation of authority
       to distribute.....................       "
  38.  (a)  Method of distribution..........  Distribution of Units, Total
                                                Reinvestment Plan
       (b)  Underwriting agreements.........    "
       (c)  Selling agreements..............    "
  39.  (a)  Organization of principal
            underwriters....................  The Sponsor
       (b)  N.A.S.D. membership of
            principal underwriters..........    "
  40.  Certain fees received by
       principal underwriters............     Not Applicable
  41.  (a)  Business of principal
            underwriters....................  The Sponsor
       (b)  Branch offices of principal
            underwriters....................  Not Applicable
       (c)  Salesmen of principal
            underwriters....................    "
  42.  Ownership of trust's
       securities by certain persons.....       "
  43.  Certain brokerage commissions
       received by principal
       underwriters......................       "
  44.  (a)  Method of valuation.............  Summary of Essential
                                              Information,
                                                Offering Price, Accrued
                                              Interest,
                                                Volume and Other Discounts,
                                                Total Reinvestment Plan,
                                                Distribution of Units
       (b)  Schedule as to offering price...  Not Applicable
       (c)  Variation in offering price
            to certain persons..............  Distribution of Units, Total
                                                Reinvestment Plan, Volume and
                                                Other Discounts
  45.  Suspension of redemption rights.....   Trustee Redemption

  46.  (a)  Redemption valuation............  Comparison of Public Offering
                                              Price,
                                                Sponsor's Repurchase Price and
                                                Redemption Price, Trustee
                                              Redemption
       (b)  Schedule as to
            redemption price................  Not Applicable
  47.  Maintenance of position in
       underlying securities.............     Comparison of Public Offering
                                              Price,
                                                Sponsor's Repurchase Price and
                                                Redemption Price, Sponsor
                                                Repurchase, Trustee Redemption


                V.  Information Concerning the Trustee or Custodian

  48.  Organization and regulation
       of trustee........................     The Trustee
  49.  Fees and expenses of trustee........   Trust Expenses and Charges
  50.  Trustee's lien......................     "


          VI.  Information Concerning Insurance of Holders of Securities

  51.  Insurance of holders of
       trust's securities................     Not Applicable


                            VII.  Policy of Registrant


  52.  (a)  Provisions of trust agreement
            with respect to selection or
            elimination of underlying
            securities......................  Objectives, Portfolio, Portfolio
                                                Supervision
       (b)  Transactions involving
            elimination of underlying
            securities......................  Not Applicable
       (c)  Policy regarding substitution
            or elimination of underlying
            securities......................  Objectives, Portfolio, Portfolio
                                                Supervision, Substitution of
                                              Bonds
       (d)  Fundamental policy not
            otherwise covered...............  Not Applicable
  53.  Tax status of trust.................   Tax Status


                   VIII.  Financial and Statistical Information

  54.  Trust's securities during
       last ten years....................     Not Applicable
  55.  Hypothetical account for issuers
       of periodic payment plans.........       "
  56.  Certain information regarding
       periodic payment certificates.....       "
  57.  Certain information regarding
       periodic payment plans............       "
  58.  Certain other information
       regarding periodic payment plans..       "
  59.  Financial Statements
     (Instruction 1(c) to Form S-6)......     Statement of Financial Condition
<PAGE>


                 NOTE:  Part A of This Prospectus May Not Be     
                        Distributed Unless Accompanied by Part B.


                        INSURED MUNICIPAL SECURITIES TRUST

                               22ND DISCOUNT SERIES
                              (MULTIPLIER PORTFOLIO)


                                                                              
       
          The Trust is a unit investment trust designated 22nd Discount Series
    ("Insured Municipal Discount Trust") with an underlying portfolio of long-
    term insured tax-exempt bonds issued by or on behalf of states,
    municipalities and public authorities and was formed to preserve capital
    and to provide interest income (including, where applicable, earned
    original issue discount) which, in the opinions of bond counsel to the
    respective issuers, is, with certain exceptions, currently exempt from
    regular federal income tax under existing law but may be subject to state
    and local taxes.  Capital gains are subject to tax.  (See "Tax Status" and
    "The Trust--Portfolio" in Part B of this Prospectus.)  The Sponsor is
    Bear, Stearns & Co. Inc.  The value of the Units of the Trust will
    fluctuate with the value of the underlying bonds.  Minimum purchase:  1
    Unit. 

                                                                              


          This Prospectus consists of two parts.  Part A contains the Summary
    of Essential Information as of June 30, 1994 (the "Evaluation Date"), a
    summary of certain specific information regarding the Trust and audited
    financial statements of the Trust, including the related portfolio, as of
    the Evaluation Date.  Part B of this Prospectus contains a general summary
    of the Trust. 
        
                    Investors should retain both parts of this
                         Prospectus for future reference. 

                                                                              


     THESE SECURITIES HAVE NOT BEEN APPROVED OR DISAPPROVED BY THE SECURITIES
     AND EXCHANGE COMMISSION OR ANY STATE SECURITIES COMMISSION NOR HAS THE
     COMMISSION OR ANY STATE SECURITIES COMMISSION PASSED UPON THE ACCURACY OR
     ADEQUACY OF THIS PROSPECTUS.  ANY REPRESENTATION TO THE CONTRARY IS A
     CRIMINAL OFFENSE.
       
                     Prospectus Part A Dated October 28, 1994
        
    <PAGE>
       
          THE TRUST.  The Trust is a unit investment trust formed to preserve
    capital and to provide interest income (including, where applicable,
    earned original issue discount) which, in the opinions of bond counsel to
    the respective issuers, is, with certain exceptions, currently exempt from
    regular federal income tax under existing law through investment in a
    fixed, diversified portfolio of long-term insured bonds (the "Bonds")
    issued by or on behalf of states, municipalities and public authorities
    which, because of irrevocable insurance, are rated "AAA" by Standard &
    Poor's Corporation.  Although the Supreme Court has determined that
    Congress has the authority to subject interest on bonds such as the Bonds
    in the Trust to regular federal income taxation, existing law excludes
    such interest from regular federal income tax.  Such interest income may,
    however, be subject to the federal corporate alternative minimum tax and
    to state and local taxes.  (See "Tax Status" in Part B of this
    Prospectus.)  For a list of ratings on the Evaluation Date, see
    "Portfolio."  The Bonds were acquired at prices which resulted in the
    portfolio as a whole being purchased at a deep discount from par value. 
    The portfolio may also include bonds issued at an original issue discount. 
    Additionally, some of the Bonds in the portfolio may be "Zero Coupon
    Bonds," which are original issue discount bonds that provide for payment
    at maturity at par value, but do not provide for the payment of any
    current interest.  Some of the Bonds in the Trust have been issued with
    optional refunding or refinancing provisions ("Refunded Bonds") whereby
    the issuer of the Bond has the right to call such Bond prior to its stated
    maturity date (and other than pursuant to sinking fund provisions) and to
    issue new bonds ("Refunding Bonds") in order to finance the redemption. 
    Issuers typically utilize refunding calls in order to take advantage of
    lower interest rates in the marketplace.  Some of these Refunded Bonds may
    be called for redemption pursuant to pre-refunding provisions ("Pre-
    Refunded Bonds") whereby the proceeds from the issue of the Refunding
    Bonds are typically invested in government securities in escrow for the
    benefit of the holders of the Pre-Refunded Bonds until the refunding call
    date.  Usually, Pre-Refunded Bonds will bear a triple-A rating because of
    this escrow.  The issuers of Pre-Refunded Bonds must call such Bonds on
    their refunding call date.  Therefore, as of such date, the Trust will
    receive the call price for such bonds but will cease receiving interest
    income with respect to them.  For a list of those Bonds which are Pre-
    Refunded Bonds, if any, as of the Evaluation Date, see "Notes to Financial
    Statements" in this Part A.  Some of the Bonds in the portfolio may have
    been purchased at an aggregate premium over par.  All of the Bonds in the
    Trust were rated "AAA" by Standard & Poor's Corporation at the time
    originally deposited in the Trust.  This rating results from insurance
    relating only to the Bonds in the Trust and not to the Units of the Trust. 
    The insurance does not remove market risk, as it does not guarantee the
    market value of the Units.  For a discussion of the significance of such
    ratings, see "Description of Bond Ratings" in Part B of this Prospectus,
    and for a list of ratings on the Evaluation Date see the "Portfolio."  The
    payment of interest and preservation of capital are, of course, dependent
    upon the continuing ability of issuers of the Bonds or the insurers
    thereof to meet their obligations.  There can be no assurance that the
    Trust's investment objectives will be achieved.  Investment in the Trust
    should be made with an understanding of the risks which an investment in
    long-term fixed rate debt obligations may entail, including the risk that
    the value of the underlying portfolio will decline with increases in
    interest rates, and that the value of Zero Coupon Bonds is subject to
    greater fluctuation than coupon bonds in response to changes in interest
    rates.  Each Unit in the Trust represents a 1/13947th undivided interest
    in the principal and net income of the Trust.  The principal amount of
    Bonds deposited in the Trust per Unit is reflected in the Summary of
    Essential Information.  (See "Organization" in Part B of this Prospectus.) 
    The Units being offered hereby are issued and outstanding Units which have
    been purchased by the Sponsor in the secondary market. 

          INSURANCE.  Each of the Bonds in the Trust is insured by a municipal
    bond guaranty insurance policy obtained by either the Sponsor ("Sponsor-
    Insured Bonds") or the issuers of the Bonds ("Pre-Insured Bonds") and
    issued by one of the insurance companies (the "Insurance Companies"),
    described under "Insurance on the Bonds" in Part B of this Prospectus,
    covering scheduled payment of principal thereof and interest thereon when
    such amounts shall become due for payment but shall not have been paid by
    the issuer or any other insurer thereof.  The insurance, unless obtained
    by Municipal Bond Investors Assurance Corporation ("MBIA Corp."), will
    also cover any accelerated payments of principal and the increase in
    interest payments or premiums, if any, payable upon mandatory redemption
    of the Bonds if interest on any Bonds is ultimately deemed to be subject
    to regular federal income tax.  Insurance obtained from MBIA Corp. only
    guarantees the accelerated payments required to be made by or on behalf of
    an issuer of small industrial revenue bonds and pollution control bonds if
    there is an event which results in the loss of tax-exempt status of the
    interest on such Bonds, including principal, interest or premium payments,
    if any, as and when required.  To the extent, therefore, that Bonds are
    only covered by insurance obtained from MBIA Corp., such Bonds will not be
    covered for the accelerated payments required to be made by or on behalf
    of an issuer of other than small industrial revenue bonds or pollution
    control revenue bonds if there occurs an event which results in the loss
    of tax-exempt status of the interest on such Bonds.  None of the insurance
    will cover accelerated payments of principal or penalty interest or
    premiums unrelated to taxability of interest on the Bonds (although the
    insurance, including insurance obtained by MBIA Corp., does guarantee
    payment of principal and interest in such amounts and at such times as
    such amounts would have been due absent such acceleration).  The insurance
    relates only to the prompt payment of principal of and interest on the
    securities in the portfolio, and does not remove market risks or guarantee
    the market value of the Units in the Trust.  The terms of the insurance
    are more fully described under "Insurance on the Bonds" in Part B of this
    Prospectus.  For a discussion of the effect of an occurrence of nonpayment
    of principal or interest on any Bonds in the Trust, see "Portfolio
    Supervision" in Part B of this Prospectus.  No representation is made
    herein as to any Bond insurer's ability to meet its obligations under a
    policy of insurance relating to any of the Bonds.  In addition, investors
    should be aware that, subsequent to the Date of Deposit, the rating of the
    claims-paying ability of the insurer of an underlying Bond may be
    downgraded, which may result in a downgrading of the rating of the Units
    in the Trust.  The approximate percentage of the aggregate principal
    amount of the portfolio that is insured by each Insurance Company is as
    follows:  AMBAC Indemnity Corp. ("AMBAC"), 7.6%; Bond Investors Guaranty
    ("BIG"), 3.8%; Financial Guaranty Insurance Company ("Financial
    Guaranty"), 23.5%, and Municipal Bond Insurance Association ("MBIA"),
    65.1%. 

          PUBLIC OFFERING PRICE.  The secondary market Public Offering Price
    of each Unit is equal to the aggregate bid price of the Bonds in the Trust
    divided by the number of Units outstanding, plus a sales charge of 5.5% of
    the Public Offering Price, or 5.820% of the net amount invested in Bonds
    per Unit.  In addition, accrued interest to the expected date of
    settlement, including earned original issue discount, is added to the
    Public Offering Price.  If Units had been purchased on the Evaluation
    Date, the Public Offering Price per Unit would have been $466.42 plus
    accrued interest of $8.01 under the monthly distribution plan, $10.79
    under the semi-annual distribution plan and $30.08 under the annual
    distribution plan, for a total of $474.43, $477.21 and $496.50,
    respectively.  The Public Offering Price per Unit can vary on a daily
    basis in accordance with fluctuations in the aggregate bid price of the
    Bonds.  (See "Public Offering--Offering Price" in Part B of this
    Prospectus.)

          ESTIMATED LONG TERM RETURN AND ESTIMATED CURRENT RETURN.  Units of
    each Trust are offered to investors on a "dollar price" basis (using the
    computation method previously described under "Public Offering Price") as
    distinguished from a "yield price" basis often used in offerings of tax
    exempt bonds (involving the lesser of the yield as computed to maturity of
    bonds or to an earlier redemption date).  Since they are offered on a
    dollar price basis, the rate of return on an investment in Units of each
    Trust is measured in terms of "Estimated Current Return" and "Estimated
    Long Term Return".

          Estimated Long Term Return is calculated by:  (1) computing the
    yield to maturity or to an earlier call date (whichever results in a lower
    yield) for each Bond in the Trust's portfolio in accordance with accepted
    bond practices, which practices take into account not only the interest
    payable on the Bond but also the amortization of premiums or accretion of
    discounts, if any; (2) calculating the average of the yields for the Bonds
    in the Trust's portfolio by weighing each Bond's yield by the market value
    of the Bond and by the amount of time remaining to the date to which the
    Bond is priced (thus creating an average yield for the portfolio of the
    Trust); and (3) reducing the average yield for the portfolio of the Trust
    in order to reflect estimated fees and expenses of the Trust and the
    maximum sales charge paid by investors.  The resulting Estimated Long Term
    Return represents a measure of the return to investors earned over the
    estimated life of the Trust.  (For the Estimated Long Term Return to
    Certificateholders under the monthly, semi-annual and annual distribution
    plans, see "Summary of Essential Information".)

          Estimated Current Return is a measure of the Trust's cash flow. 
    Estimated Current Return is computed by dividing the Estimated Net Annual
    Interest Income per Unit by the Public Offering Price per Unit.  In
    contrast to the Estimated Long Term Return, the Estimated Current Return
    does not take into account the amortization of premium or accretion of
    discount, if any, on the Bonds in the portfolio of the Trust.  Moreover,
    because interest rates on Bonds purchased at a premium are generally
    higher than current interest rates on newly issued bonds of a similar type
    with comparable rating, the Estimated Current Return per Unit may be
    affected adversely if such Bonds are redeemed prior to their maturity.

          The Estimated Net Annual Interest Income per Unit of the Trust will
    vary with changes in the fees and expenses of the Trustee and the
    Evaluator applicable to the Trust and with the redemption, maturity, sale
    or other disposition of the Bonds in the Trust.  The Public Offering Price
    will vary with changes in the bid prices of the Bonds.  Therefore, there
    is no assurance that the present Estimated Current Return or Estimated
    Long Term Return will be realized in the future.  (For the Estimated
    Current Return to Certificateholders under the monthly, semi-annual and
    annual distribution plans, see "Summary of Essential Information".  See
    "Estimated Long Term Return and Estimated Current Return" in Part B of
    this Prospectus.)

          A schedule of cash flow projections is available from the Sponsor
    upon request.
        
          DISTRIBUTIONS.  Distributions of interest income, less expenses,
    will be made by the Trust either monthly, semi-annually or annually
    depending upon the plan of distribution applicable to the Unit purchased. 
    A purchaser of a Unit in the secondary market will initially receive
    distributions in accordance with the distribution plan chosen by the prior
    owner of such Unit and may thereafter change the plan as provided under
    "Interest and Principal Distributions" in Part B of this Prospectus. 
    Distributions of principal, if any, will be made semi-annually on June 15
    and December 15 of each year.  (See "Rights of Certificateholders--
    Interest and Principal Distributions" in Part B of this Prospectus.  For
    estimated monthly, semi-annual and annual interest distributions, see
    "Summary of Essential Information.")
       
          MARKET FOR UNITS.  The Sponsor, although not obligated to do so,
    intends to maintain a secondary market for the Units at prices based on
    the aggregate bid price of the Bonds in the Trust portfolio.  The reoffer
    price will be based on the aggregate bid price of the Bonds plus a sales
    charge of 5.5% of the Public Offering Price (5.820% of the net amount
    invested), plus net accrued interest.  If a market is not maintained a
    Certificateholder will be able to redeem his Units with the Trustee at a
    price also based on the aggregate bid price of the Bonds.  (See
    "Liquidity--Sponsor Repurchase" and "Public Offering--Offering Price" in
    Part B of this Prospectus.)
        
          TOTAL REINVESTMENT PLAN.  Certificateholders under the semi-annual
    and annual plans of distribution have the opportunity to have all their
    regular interest distributions, and principal distributions, if any,
    reinvested in available series of "Insured Municipal Securities Trust" or
    "Municipal Securities Trust."  (See "Total Reinvestment Plan" in Part B of
    this Prospectus.  Residents of Texas see "Total Reinvestment Plan for
    Texas Residents" in Part B of this Prospectus.)  The Plan is not designed
    to be a complete investment program. 

    <PAGE>
       
                        INSURED MUNICIPAL SECURITIES TRUST
                               22ND DISCOUNT SERIES

               SUMMARY OF ESSENTIAL INFORMATION AS OF JUNE 30, 1994


     Date of Deposit:  August 7, 1986           Weighted Average Life to 
     Principal Amount of Bonds ...$10,835,000    Maturity:  19.7 Years.
     Number of Units .............13,947        Minimum Value of Trust:
     Fractional Undivided Inter-                 Trust may be terminated if
       est in Trust per Unit .....1/13947        value of Trust is less than
     Principal Amount of                         $5,600,000 in principal
       Bonds per Unit ............$776.87        amount of Bonds.
     Secondary Market Public                    Mandatory Termination Date:
       Offering Price**                          The earlier of December 31,
       Aggregate Bid Price                       2035 or the disposition of
         of Bonds in Trust .......$6,147,378+++  the last Bond in the Trust.
       Divided by 13,947 Units ...$440.77       Trustee***:  United States
       Plus Sales Charge of 5.5%                 Trust Company of New York.
         of Public Offering Price $25.65        Trustee's Annual Fee:  Monthly 
       Public Offering Price                     plan $1.02 per $1,000; semi-
         per Unit ................$466.42+       annual plan $.54 per $1,000;
     Redemption and Sponsor's                    and annual plan is $.35 per
       Repurchase Price                          $1,000.
       per Unit ..................$440.77+      Evaluator:  Kenny S&P
                                         +++     Evaluation Services. 
                                         ++++   Evaluator's Fee for Each
     Excess of Secondary Market                  Evaluation:  Minimum of $12
       Public Offering Price                     plus $.25 per each issue of
       over Redemption and                       Bonds in excess of 50 issues
       Sponsor's Repurchase                      (treating separate maturities
       Price per Unit ............$25.65++++     as separate issues).
     Difference between Public                  Sponsor:  Bear, Stearns & Co.
       Offering Price per Unit                   Inc.
       and Principal Amount per                 Sponsor's Annual Fee:  Maximum
       Unit Premium/(Discount) ...$(310.45)      of $.15 per $1,000 principal
     Evaluation Time:  4:00 p.m.                 amount of Bonds (see "Trust
       New York Time.                            Expenses and Charges" in
     Minimum Principal Distribution:             Part B of this Prospectus).
       $1.00 per Unit.


        PER UNIT INFORMATION BASED UPON INTEREST DISTRIBUTION PLAN ELECTED

                                            Monthly   Semi-Annual   Annual
                                            Option      Option      Option

    Gross annual interest income# ......... $38.22      $38.22      $38.22
    Less estimated annual fees and
      expenses ............................   1.48         .96         .79
    Estimated net annual interest           ______      ______      ______
      income (cash)# ...................... $36.74      $37.26      $37.43
    Estimated interest distribution# ......   3.06       18.63       37.43
    Estimated daily interest accrual# .....  .1020       .1035       .1039
    Estimated current return#++ ...........  7.88%       7.99%       8.02%
    Estimated long term return++ ..........  4.89%       5.00%       5.04%
    Record dates .......................... 1st of      Dec. 1 and   Dec. 1
                                            each month  June 1
    Interest distribution dates ........... 15th of     Dec. 15 and  Dec. 15
                                            each month  June 15
        
    <PAGE>
       *  The Date of Deposit is the date on which the Trust Agreement was
          signed and the deposit of the Bonds with the Trustee made.

      **  For information regarding offering price per Unit and applicable
          sales charge under the Total Reinvestment Plan, see "Total
          Reinvestment Plan" in Part B of this Prospectus. 

     ***  The Trustee maintains its corporate trust office at 770 Broadway,
          New York, New York 10003 (tel. no. 1-800-428-8890).  For information
          regarding redemption by the trustee, see "Trustee Redemption" in
          Part B of this Prospectus.
       
       +  Plus accrued interest to the expected date of settlement
          (approximately five business days after purchase) of $8.01 monthly,
          $10.79 semi-annually and $30.08 annually. 
        
      ++  The estimated current return and estimated long term return are
          increased for transactions entitled to a discount (see "Employee
          Discounts" in Part B of this Prospectus), and are higher under the
          semi-annual and annual options due to lower Trustee's fees and
          expenses.

     +++  Based solely upon the bid side evaluation of the underlying Bonds
          (including, where applicable, undistributed cash from the principal
          account).  Upon tender for redemption, the price to be paid will be
          calculated as described under "Trustee Redemption" in Part B of this
          Prospectus. 

    ++++  See "Comparison of Public Offering Price, Sponsor's Repurchase Price
          and Redemption Price" in Part B of this Prospectus. 

       #  Does not include income accrual from original issue discount bonds,
          if any.

    <PAGE>
       
                          INFORMATION REGARDING THE TRUST
                                AS OF JUNE 30, 1994


    DESCRIPTION OF PORTFOLIO*

          The portfolio of the Trust consists of 18 issues representing
    obligations of issuers located in 11 states and the District of Columbia. 
    The Sponsor has not participated as a sole underwriter or manager, co-
    manager or member of an underwriting syndicate from which any of the
    initial aggregate principal amount of the Bonds were acquired. 
    Approximately 48.9% of the Bonds are obligations of state and local
    housing authorities; approximately 14.3% are hospital revenue bonds;
    approximately 9.9% were issued in connection with the financing of nuclear
    generating facilities; and none are "mortgage subsidy" bonds.  All of the
    Bonds in the Trust are subject to redemption prior to their stated
    maturity dates pursuant to sinking fund or call provisions.  The Bonds may
    also be subject to other calls, which may be permitted or required by
    events which cannot be predicted (such as destruction, condemnation,
    termination of a contract, or receipt of excess or unanticipated
    revenues).  None of the Bonds are general obligation bonds.  Eighteen
    issues representing $10,835,000 of the principal amount of the Bonds are
    payable from the income of a specific project or authority and are not
    supported by the issuer's power to levy taxes.  The portfolio is divided
    for purpose of issue as follows:  Coal Power 2, Electric and Gas 1,
    Federally Insured Mortgage 2, Hospital 4, Hydro Electric 1, Nuclear
    Power 2, Pollution Control 1, University 1, Wastewater 1, Water 1, and
    Water and Sewer 2.  For an explanation of the significance of these
    factors see "The Trust--Portfolio" in Part B of this Prospectus. 


    *     Changes in the Trust Portfolio:  From July 1, 1994 to September 23,
          1994, the entire principal amount of the Bonds in portfolio no. 4
          has been called and is no longer contained in the Trust.

          As of June 30, 1994, $5,295,000 (approximately 48.9% of the
    aggregate principal amount of the Bonds) were original issue discount
    bonds.  Of these original issue discount bonds, $5,295,000 (approximately
    48.9% of the aggregate principal amount of the Bonds) were Zero Coupon
    Bonds.  Zero Coupon Bonds do not provide for the payment of any current
    interest and provide for payment at maturity at par value unless sooner
    sold or redeemed.  The market value of Zero Coupon Bonds is subject to
    greater fluctuations than coupon bonds in response to changes in interest
    rates.  None of the aggregate principal amount of the Bonds in the Trust
    were purchased at a "market" discount from par value at maturity,
    approximately 51.1% were purchased at a premium and none were purchased at
    par.  For an explanation of the significance of these factors see
    "Discount and Zero Coupon Bonds" in Part B of this Prospectus. 
        
          None of the Bonds in the Trust are subject to the federal individual
    alternative minimum tax under the Tax Reform Act of 1986.  See "Tax
    Status" in Part B of this Prospectus. 


    <PAGE>
                       FINANCIAL AND STATISTICAL INFORMATION


    Selected data for each Unit outstanding for the periods listed below:

                                                                    Distribu-
                                                                    tions of
                                          Distributions of Interest Principal
                                         During the Period (per Unit) During
                             Net Asset*            Semi-              the
                  Units Out-   Value     Monthly   Annual   Annual   Period
    Period Ended   standing   Per Unit   Option    Option   Option  (Per Unit)

       
    June 30, 1992   14,000     $594.79   $45.54    $46.20   $46.36     -0- 
    June 30, 1993   13,977      577.57    44.78     45.48    46.06    $7.29
    June 30, 1994   13,947      451.99    39.55     40.11    43.85    97.77


    *     Net Asset Value per Unit is calculated by dividing net assets as
          disclosed in the "Statement of Net Assets" by the number of Units
          outstanding as of the date of the Statement of Net Assets.  See
          Note 5 of Notes to Financial Statements for a description of the
          components of Net Assets.


        
<PAGE>


Independent Auditors' Report

The Sponsor, Trustee and Certificateholders
Insured Municipal Securities Trust, 22nd Discount Series:


We have audited the accompanying statement of net assets, including the
portfolio, of Insured Municipal Securities Trust, 22nd Discount Series as of
June 30, 1994, and the related statements of operations, and changes in net
assets for each of the years in the three year period then ended.  These
financial statements are the responsibility of the Trustee (see note 2).  Our
responsibility is to express an opinion on these financial statements 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 financial statements are free of
material misstatement.  An audit includes examining, on a test basis, evidence
supporting the amounts and disclosures in the financial statements.  Our
procedures included confirmation of securities owned as of June 30, 1994, by
correspondence with the Trustee.  An audit also includes assessing the
accounting principles used and significant estimates made by management, as
well as evaluating the overall financial statement presentation.  We believe
that our audits provide a reasonable basis for our opinion.

In our opinion, the financial statements referred to above present fairly, in
all material respects, the financial position of Insured Municipal Securities
Trust, 22nd Discount Series as of June 30, 1994, and the results of its
operations and the changes in its net assets for each of the years in the
three year period then ended, in conformity with generally accepted accounting
principles.


    KPMG Peat Marwick LLP


New York, New York
September 15, 1994
<PAGE>
<TABLE>
                  INSURED MUNICIPAL SECURITIES TRUST, 22ND DISCOUNT SERIES

                                 Statement of Net Assets

                                      June 30, 1994
<S>
       Investments in marketable securities,                                    <C>
          at market value (cost             $6,500,237)                         $ 6,147,311

       Excess of other assets over total liabilities                                156,609
                                                                                  ----------

       Net assets (  13,947 units      of fractional undivided
          interest outstanding,        $451.99 per      unit)                   $ 6,303,920
                                                                                  ==========

       See accompanying notes to financial statements.
</TABLE>
<PAGE>
<TABLE>
             INSURED MUNICIPAL SECURITIES TRUST, 22ND DISCOUNT SERIES

                              Statements of Operations
<CAPTION>
                                                               Years ended June 30,
                                               -------------       -------------       -------------
                                                   1994                1993                1992
                                               -------------       -------------       -------------
<S>                                         <C>                    <C>                 <C> 
     Investment income - interest           $       585,510             674,815             682,400
                                               -------------       -------------       -------------

     Expenses:
        Trustee's fees                               12,619              14,955              14,601
        Evaluator's fees                              3,309               3,412               3,024
        Sponsor's fees                                2,054               2,069               2,069
                                               -------------       -------------       -------------

                   Total expenses                    17,982              20,436              19,694
                                               -------------       -------------       -------------

                   Investment income, net           567,528             654,379             662,706
                                               -------------       -------------       -------------

     Realized and unrealized gain (loss)
        on investments:
          Net realized loss
            on bonds sold or called                 (84,460)             (4,852)             (8,404)
          Unrealized appreciation
            (depreciation) for the year            (315,443)           (157,925)            124,435
                                               -------------       -------------       -------------

                Net gain (loss) on
                  investments                      (399,903)           (162,777)            116,031
                                               -------------       -------------       -------------

                Net increase in net
                  assets resulting
                  from operations           $       167,625             491,602             778,737
                                               =============       =============       =============

     See accompanying notes to financial statements.
</TABLE>
<PAGE>
<TABLE>
              INSURED MUNICIPAL SECURITIES TRUST, 22ND DISCOUNT SERIES

                          Statements of Changes in Net Assets
<CAPTION>
                                                                 Years ended June 30,
                                                     ------------    ------------    ------------
                                                         1994            1993            1992
                                                     ------------    ------------    ------------
<S>                                               <C>                <C>             <C>
      Operations:
         Investment income, net                   $      567,528         654,379         662,706
         Net realized loss on
           bonds sold or called                          (84,460)         (4,852)         (8,404)
         Unrealized appreciation
           (depreciation) for the year                  (315,443)       (157,925)        124,435
                                                     ------------    ------------    ------------

                      Net increase in net
                        assets resulting
                        from operations                  167,625         491,602         778,737
                                                     ------------    ------------    ------------

      Distributions to Certificateholders:
           Investment income                             556,037         630,662         641,334
           Principal                                   1,365,228         102,060          -

      Redemptions:
          Interest                                           249             250          -
          Principal                                       14,839          13,011          -
                                                     ------------    ------------    ------------

                      Total distributions
                      and redemptions                  1,936,353         745,983         641,334
                                                     ------------    ------------    ------------

                      Total increase (decrease)       (1,768,728)       (254,381)        137,403

      Net assets at beginning of year                  8,072,648       8,327,029       8,189,626
                                                     ------------    ------------    ------------

      Net assets at end of year (including
         undistributed net investment
         income of  $272,518,      $266,035 and
         $264,065, respectively)                  $    6,303,920       8,072,648       8,327,029
                                                     ============    ============    ============

      See accompanying notes to financial statements.
</TABLE>
<PAGE>
INSURED MUNICIPAL SECURITIES TRUST, 22ND DISCOUNT SERIES

Notes to Financial Statements

June 30, 1994, 1993 and 1992



(1)    Organization and Financial and Statistical Information

Insured Municipal Securities Trust, 22nd Discount Series (Trust) was
organized on August 7, 1986 by Bear, Stearns & Co. Inc. (Sponsor)
under the laws of the State of New York by a Trust Indenture and
Agreement, and is registered under the Investment Company Act
of 1940.

(2)    Summary of Significant Accounting Policies

United States Trust Company of New York (Trustee) has custody of and
responsibility for the accounting records and financial statements of
the Trust and is responsible for establishing and maintaining a
system of internal control related thereto.

The Trustee is also responsible for all estimates of expenses and
accruals reflected in the Trust's financial statements.  The
accompanying financial statements have been adjusted to record the
unrealized appreciation (depreciation) of investments and to record
interest income and expenses on the accrual basis.

The discount on the zero-coupon bonds is accreted by the interest
method over the respective lives of the bonds.  The accretion of such
discount is included in interest income; however, it is not
distributed until realized in cash upon maturity or sale of the
respective bonds.

Investments are carried at market value which is determined by either
Standard & Poor's Corporation or Moody's Investors Service, Inc.
(Evaluator) as discussed in Footnotes to Portfolio. The market value
of the investments is based upon the bid prices for the bonds at the
end of the year, except that the market value on the date of deposit
represents the cost to the Trust based on the offering prices for
investments at that date.  The difference between cost (including
accumulated accretion of original issue discount on zero-coupon
bonds) and market value is reflected as unrealized appreciation
(depreciation) of investments.  Securities transactions are recorded
on the trade date.  Realized gains (losses) from securities
transactions are determined on the basis of average cost of the
securities sold or redeemed.

(3)    Income Taxes

The Trust is not subject to Federal income taxes as provided for by
the Internal Revenue Code.

(4)    Trust Administration

The fees and expenses of the Trust are incurred and paid on the basis
set forth under "Trust Expenses and Charges" in Part B of this
Prospectus.

The Trust Indenture and Agreement provides for interest distributions
as often as monthly (depending upon the distribution plan elected by
the Certificateholders).

The Trust Indenture and Agreement further requires that principal
received from the disposition of bonds, other than those bonds sold
in connection with the redemption of units, be distributed to
Certificateholders.

See "Financial and Statistical Information" in Part A of this
Prospectus for the amounts of per unit distributions during the years
ended June 30, 1994, 1993 and 1992.

The Trust Indenture and Agreement also requires the Trust to redeem
units tendered.  30 and 23 units were redeemed during the years ended
June 30 1994 and 1993. No units were redeemed during the year ended
June 30, 1992.

(5)    Net Assets

At June 30, 1994, the net assets of the Trust represented the
interest of Certificateholders as follows:

     Original cost to Certificateholders                   $ 8,582,728
     Less initial gross underwriting commission               (472,080)

                                                             8,110,648

     Cost of securities sold or called                      (1,726,387)
     Net unrealized depreciation                              (352,926)
     Undistributed net investment income                       272,518
     Undistributed proceeds from bonds sold or called               67

         Total                                             $ 6,303,920

The original cost to Certificateholders, less the initial gross
underwriting commission, represents the aggregate initial public
offering price net of the applicable sales charge on 14,000 units of
fractional undivided interest of the Trust as of the date of deposit.

Undistributed net investment income includes accumulated accretion of
original issue discount of $115,976.
<PAGE>
<TABLE>
INSURED MUNICIPAL SECURITIES TRUST, 22ND DISCOUNT SERIES
Portfolio
June 30, 1994
<CAPTION>
Port-     Aggregate                                           Coupon Rate/   Redemption Feature
folio      Principal          Name of Issuer        Ratings   Date(s) of     S.F.--Sinking Fund       Market
No.        Amount           and Title of Bonds        (1)     Maturity(2)    Ref.--Refunding(2)(7)    Value(3)
- -----   ---------------   ----------------------    -------   ------------   ---------------------    -----------
<S>   <C>                 <C>                       <C>       <C>            <C>                    <C>
   1  $         700,000   Hillsboro County,           AAA     9.000%         12/01/09 @ 100 S.F.    $     830,095
                          Florida Refunding and               12/01/2015     12/01/99 @ 100 Ref.
                          Improvement Utility
                          Revenue Bonds Series
                          1985 (MBIA) (5)

                                                      AAA

   2            325,000   Municipal Electric          AAA     9.000          1/01/18 @ 100 S.F.           339,544
                          Authority of Georgia                1/01/2020      1/01/95 @ 102 Ref.
                          Power Revenue Bonds
                          Series 1984 K (AMBAC)

   3            100,000   Private Colleges and        AAA     9.200          11/01/06 @ 100 S.F.          108,038
                          Universities (Georgia)              11/01/2015     11/01/95 @ 102 Ref.
                          Authority Revenue Bonds
                          (Mercer University
                          Project) Series 1985
                          (BIG) (5)

   4            700,000   Development Authority       AAA     11.625         No Sinking Fund              723,555
                          of Burke County                     9/01/2014      9/01/94 @ 102 Ref.
                          (Georgia) Pollution
                          Control Revenue Bonds
                          (Georgia Power Company
                          Plant Vogtle Project)
                          Second Series 1984
                          (Financial Guaranty)

   5            500,000   County of Monroe,           AAA     9.625          12/01/96 @ 100 S.F.          552,505
                          Michigan Pollution                  12/01/2015     12/01/95 @ 103 Ref.
                          Control Revenue
                          (Detroit Edison Company
                          Project) Series A-1985
                          (AMBAC)

   6            800,000   Health and Educational      AAA     9.000          12/01/06 @ 100 S.F.          865,088
                          Facilities Authority of             12/01/2016     12/01/95 @ 102 Ref.
                          the State of Missouri
                          Insured Health
                          Facilities Revenue
                          Bonds (St. Luke's
                          Episcopal-Presbyterian
                          Hospitals Project)
                          (Financial Guaranty)
                          (5)

   7            400,000   Hospital Authority No.      AAA     9.625          6/01/04 @ 100 S.F.           426,288
                          1 of Lancaster County,              6/01/2012      6/01/95 @ 102 Ref.
                          Nebraska Hospital
                          Revenue Refunding
                          Bonds, 1985 (Bryan
                          Memorial Hospital
                          Projects) (MBIA) (5)

   8            700,000   Ocean County Utilities      AAA     8.700          1/01/07 @ 100 S.F.           756,350
                          Authority New Jersey                1/01/2011      1/01/96 @ 102 Ref.
                          Wastewater Revenue
                          Refunding Bonds, Series
                          1985 (Financial
                          Guaranty) (5)

   9             50,000   City of Farmington, New     AAA     9.750          5/15/06 @ 100 S.F.            55,508
                          Mexico Utility System               5/15/2013      5/15/96 @ 102 Ref.
                          Revenue Bonds Series
                          1985 (Financial
                          Guaranty) (5)

  10            500,000   Northeastern Ohio           AAA     10.500%        10/01/05 @ 100 S.F.          523,845
                          Regional Sewer                      4/01/2008      10/01/94 @ 103 Ref.
                          District, Water Reserve
                          Revenue Bonds Senior
                          Lien (MBIA) (5)

  11             50,000   City of Springfield,        AAA     9.000          2/01/01 @ 100 S.F.            52,775
                          Ohio Water System First             2/01/2010      2/01/95 @ 103 Ref.
                          Mortgage Revenue Bonds
                          Series 1985 (Financial
                          Guaranty) (5)

  12             50,000   Oklahoma Municipal          AAA     9.250          No Sinking Fund               54,302
                          Power Authority Power               1/01/2015      1/01/96 @ 102 Ref.
                          Supply System Revenue
                          Bonds, Series 1985C
                          (MBIA) (5)

  13            100,000   Lower Colorado River        AAA     9.500          1/01/06 @ 100 S.F.           108,965
                          Authority Texas                     1/01/2013      1/01/96 @ 102 Ref.
                          Priority Revenue Bonds
                          Series 1985 (BIG) (5)

  14            210,000   City of San Antonio,        AAA     9.375          2/01/05 @ 100 S.F.           219,034
                          Texas Electric and Gas              2/01/2009      2/01/95 @ 101.5 Ref.
                          System Improvement
                          Bonds New Series 1985A
                          (BIG) (5)

  15            250,000   Tarrant County (Texas)      AAA     9.750          9/01/03 @ 100 S.F.           269,655
                          Health Facilities                   9/01/2015      9/01/95 @ 102 Ref.
                          Development Corporation
                          Health System Revenue
                          Bonds Harris Methodist
                          Health System Series
                          1985 (Financial
                          Guaranty) (5)

  16            105,000   Wisconsin Health            AAA     10.250         10/01/99 @ 100 S.F.          108,778
                          Facilities Authority                10/01/2001     10/01/94 @ 102 Ref.
                          Revenue Bonds, Series
                          1984 (Sister of the
                          Sorrowful
                          Mother-Ministry
                          Corporation) (MBIA)

  17            295,000   Housing Authority of        AAA     0.000%         4/01/07 @ 13.074 S.F.         10,086
                          the County of Santa                 4/01/2026      10/01/03 @8.987 Ref.
                          Clara (California)
                          Multifamily Housing
                          Revenue Bonds Series
                          1984A (FHA Insured
                          Mortgage Loan-Cedar
                          Glen Apartments
                          Project) (MBIA)

  18          5,000,000   District of Columbia        AAA     0.000          2/01/09 @ 13.943 S.F.        142,900
                          Housing Finance Agency              2/01/2027      2/01/04 @ 8.067 Ref.
                          Multi-Family Mortgage
                          Revenue Bonds, Series
                          1984 (FHA Insured
                          Mortgage Loan-Benning
                          Heights Project -
                          Section 8 Assisted)
                          (MBIA)
        ---------------                                                                               -----------

      $      10,835,000                                                                            $    6,147,311
        ===============                                                                               ===========
See accompanying footnotes to portfolio and notes to financial statements.
</TABLE>
<PAGE>
INSURED MUNICIPAL SECURITIES TRUST, 22ND DISCOUNT SERIES

Footnotes to Portfolio

June 30, 1994


(1)    All ratings are by Standard & Poor's Corporation.  A brief
description of the ratings symbols and their meanings is set forth 
under "Description of Bond Ratings" in Part B of this Prospectus.

(2)    See "The Trust - Portfolio" in Part B of this Prospectus for an
explanation of redemption features.  See "Tax Status" in Part B of
this Prospectus for a statement of the Federal tax consequences to a
Certificateholder upon the sale, redemption or maturity of a bond.

(3)    At June 30, 1994, the net unrealized depreciation of all the 
bonds was comprised of the following:

    Gross unrealized appreciation                     $   59,528
    Gross unrealized depreciation                       (412,454)

    Net unrealized depreciation             $ (352,926)

(4)    The annual interest income, based upon bonds held at June 30, 
1994 (excluding accretion of original issue discount on zero-coupon 
bonds) to the Trust is $ 533,175.

(5)    The bonds have been prerefunded and will be redeemed at the next
refunding call date.

(6)    Bonds sold or called after June 30, 1994 are noted in a footnote
"Changes in Trust Portfolio" under "Description of Portfolio" in 
Part A of this Prospectus.

(7)    The Bonds may also be subject to other calls, which may be 
permitted or required by events which cannot be predicted (such as 
destruction, condemnation, termination of a contract, or receipt of 
excess or unanticipated revenues).

<PAGE>

                 NOTE:  Part A of This Prospectus May Not Be     
                        Distributed Unless Accompanied by Part B.


                        INSURED MUNICIPAL SECURITIES TRUST

                               23RD DISCOUNT SERIES
                              (MULTIPLIER PORTFOLIO)


                                                                              

       
          The Trust is a unit investment trust designated 23rd Discount Series
    ("Insured Municipal Discount Trust") with an underlying portfolio of long-
    term insured tax-exempt bonds issued by or on behalf of states,
    municipalities and public authorities and was formed to preserve capital
    and to provide interest income (including, where applicable, earned
    original issue discount) which, in the opinions of bond counsel to the
    respective issuers, is, with certain exceptions, currently exempt from
    regular federal income tax under existing law but may be subject to state
    and local taxes.  Capital gains are subject to tax.  (See "Tax Status" and
    "The Trust--Portfolio" in Part B of this Prospectus.)  The Sponsor is
    Bear, Stearns & Co. Inc.  The value of the Units of the Trust will
    fluctuate with the value of the underlying bonds.  Minimum purchase:  1
    Unit. 

                                                                              


          This Prospectus consists of two parts.  Part A contains the Summary
    of Essential Information as of June 30, 1994 (the "Evaluation Date"), a
    summary of certain specific information regarding the Trust and audited
    financial statements of the Trust, including the related portfolio, as of
    the Evaluation Date.  Part B of this Prospectus contains a general summary
    of the Trust. 
        
                    Investors should retain both parts of this
                         Prospectus for future reference. 

                                                                              


     THESE SECURITIES HAVE NOT BEEN APPROVED OR DISAPPROVED BY THE SECURITIES
     AND EXCHANGE COMMISSION OR ANY STATE SECURITIES COMMISSION NOR HAS THE
     COMMISSION OR ANY STATE SECURITIES COMMISSION PASSED UPON THE ACCURACY OR
     ADEQUACY OF THIS PROSPECTUS.  ANY REPRESENTATION TO THE CONTRARY IS A
     CRIMINAL OFFENSE.
       
                     Prospectus Part A Dated October 28, 1994
        
    <PAGE>
       
          THE TRUST.  The Trust is a unit investment trust formed to preserve
    capital and to provide interest income (including, where applicable,
    earned original issue discount) which, in the opinions of bond counsel to
    the respective issuers, is, with certain exceptions, currently exempt from
    regular federal income tax under existing law through investment in a
    fixed, diversified portfolio of long-term insured bonds (the "Bonds")
    issued by or on behalf of states, municipalities and public authorities
    which, because of irrevocable insurance, are rated "AAA" by Standard &
    Poor's Corporation.  Although the Supreme Court has determined that
    Congress has the authority to subject interest on bonds such as the Bonds
    in the Trust to regular federal income taxation, existing law excludes
    such interest from regular federal income tax.  Such interest income may,
    however, be subject to the federal corporate alternative minimum tax and
    to state and local taxes.  (See "Tax Status" in Part B of this
    Prospectus.)  For a list of ratings on the Evaluation Date, see
    "Portfolio."  The Bonds were acquired at prices which resulted in the
    portfolio as a whole being purchased at a deep discount from par value. 
    The portfolio may also include bonds issued at an original issue discount. 
    Additionally, some of the Bonds in the portfolio may be "Zero Coupon
    Bonds," which are original issue discount bonds that provide for payment
    at maturity at par value, but do not provide for the payment of any
    current interest.  Some of the Bonds in the Trust have been issued with
    optional refunding or refinancing provisions ("Refunded Bonds") whereby
    the issuer of the Bond has the right to call such Bond prior to its stated
    maturity date (and other than pursuant to sinking fund provisions) and to
    issue new bonds ("Refunding Bonds") in order to finance the redemption. 
    Issuers typically utilize refunding calls in order to take advantage of
    lower interest rates in the marketplace.  Some of these Refunded Bonds may
    be called for redemption pursuant to pre-refunding provisions ("Pre-
    Refunded Bonds") whereby the proceeds from the issue of the Refunding
    Bonds are typically invested in government securities in escrow for the
    benefit of the holders of the Pre-Refunded Bonds until the refunding call
    date.  Usually, Pre-Refunded Bonds will bear a triple-A rating because of
    this escrow.  The issuers of Pre-Refunded Bonds must call such Bonds on
    their refunding call date.  Therefore, as of such date, the Trust will
    receive the call price for such bonds but will cease receiving interest
    income with respect to them.  For a list of those Bonds which are Pre-
    Refunded Bonds, if any, as of the Evaluation Date, see "Notes to Financial
    Statements" in this Part A.  Some of the Bonds in the portfolio may have
    been purchased at an aggregate premium over par.  All of the Bonds in the
    Trust were rated "AAA" by Standard & Poor's Corporation at the time
    originally deposited in the Trust.  This rating results from insurance
    relating only to the Bonds in the Trust and not to the Units of the Trust. 
    The insurance does not remove market risk, as it does not guarantee the
    market value of the Units.  For a discussion of the significance of such
    ratings, see "Description of Bond Ratings" in Part B of this Prospectus,
    and for a list of ratings on the Evaluation Date see the "Portfolio."  The
    payment of interest and preservation of capital are, of course, dependent
    upon the continuing ability of issuers of the Bonds or the insurers
    thereof to meet their obligations.  There can be no assurance that the
    Trust's investment objectives will be achieved.  Investment in the Trust
    should be made with an understanding of the risks which an investment in
    long-term fixed rate debt obligations may entail, including the risk that
    the value of the underlying portfolio will decline with increases in
    interest rates, and that the value of Zero Coupon Bonds is subject to
    greater fluctuation than coupon bonds in response to changes in interest
    rates.  Each Unit in the Trust represents a 1/12985th undivided interest
    in the principal and net income of the Trust.  The principal amount of
    Bonds deposited in the Trust per Unit is reflected in the Summary of
    Essential Information.  (See "Organization" in Part B of this Prospectus.) 
    The Units being offered hereby are issued and outstanding Units which have
    been purchased by the Sponsor in the secondary market. 

          INSURANCE.  Each of the Bonds in the Trust is insured by a municipal
    bond guaranty insurance policy obtained by either the Sponsor ("Sponsor-
    Insured Bonds") or the issuers of the Bonds ("Pre-Insured Bonds") and
    issued by one of the insurance companies (the "Insurance Companies"),
    described under "Insurance on the Bonds" in Part B of this Prospectus,
    covering scheduled payment of principal thereof and interest thereon when
    such amounts shall become due for payment but shall not have been paid by
    the issuer or any other insurer thereof.  The insurance, unless obtained
    by Municipal Bond Investors Assurance Corporation ("MBIA Corp."), will
    also cover any accelerated payments of principal and the increase in
    interest payments or premiums, if any, payable upon mandatory redemption
    of the Bonds if interest on any Bonds is ultimately deemed to be subject
    to regular federal income tax.  Insurance obtained from MBIA Corp. only
    guarantees the accelerated payments required to be made by or on behalf of
    an issuer of small industrial revenue bonds and pollution control bonds if
    there is an event which results in the loss of tax-exempt status of the
    interest on such Bonds, including principal, interest or premium payments,
    if any, as and when required.  To the extent, therefore, that Bonds are
    only covered by insurance obtained from MBIA Corp., such Bonds will not be
    covered for the accelerated payments required to be made by or on behalf
    of an issuer of other than small industrial revenue bonds or pollution
    control revenue bonds if there occurs an event which results in the loss
    of tax-exempt status of the interest on such Bonds.  None of the insurance
    will cover accelerated payments of principal or penalty interest or
    premiums unrelated to taxability of interest on the Bonds (although the
    insurance, including insurance obtained by MBIA Corp., does guarantee
    payment of principal and interest in such amounts and at such times as
    such amounts would have been due absent such acceleration).  The insurance
    relates only to the prompt payment of principal of and interest on the
    securities in the portfolio, and does not remove market risks or guarantee
    the market value of the Units in the Trust.  The terms of the insurance
    are more fully described under "Insurance on the Bonds" in Part B of this
    Prospectus.  For a discussion of the effect of an occurrence of nonpayment
    of principal or interest on any Bonds in the Trust, see "Portfolio
    Supervision" in Part B of this Prospectus.  No representation is made
    herein as to any Bond insurer's ability to meet its obligations under a
    policy of insurance relating to any of the Bonds.  In addition, investors
    should be aware that, subsequent to the Date of Deposit, the rating of the
    claims-paying ability of the insurer of an underlying Bond may be
    downgraded, which may result in a downgrading of the rating of the Units
    in the Trust.  The approximate percentage of the aggregate principal
    amount of the portfolio that is insured by each Insurance Company is as
    follows:  AMBAC Indemnity Corp. ("AMBAC"), 11%; Bond Investors Guaranty
    ("BIG"), 5.1%; Financial Guaranty Insurance Company ("Financial
    Guaranty"), 27.4%; and Municipal Bond Insurance Association ("MBIA"),
    56.5%. 

          PUBLIC OFFERING PRICE.  The secondary market Public Offering Price
    of each Unit is equal to the aggregate bid price of the Bonds in the Trust
    divided by the number of Units outstanding, plus a sales charge of 5.5% of
    the Public Offering Price, or 5.820% of the net amount invested in Bonds
    per Unit.  In addition, accrued interest to the expected date of
    settlement, including earned original issue discount, is added to the
    Public Offering Price.  If Units had been purchased on the Evaluation
    Date, the Public Offering Price per Unit would have been $437.49 plus
    accrued interest of $7.27 under the monthly distribution plan, $9.73 under
    the semi-annual distribution plan and $28.32 under the annual distribution
    plan, for a total of $444.76, $447.22 and $465.81, respectively.  The
    Public Offering Price per Unit can vary on a daily basis in accordance
    with fluctuations in the aggregate bid price of the Bonds.  (See "Public
    Offering--Offering Price" in Part B of this Prospectus.)

          ESTIMATED LONG TERM RETURN AND ESTIMATED CURRENT RETURN.  Units of
    each Trust are offered to investors on a "dollar price" basis (using the
    computation method previously described under "Public Offering Price") as
    distinguished from a "yield price" basis often used in offerings of tax
    exempt bonds (involving the lesser of the yield as computed to maturity of
    bonds or to an earlier redemption date).  Since they are offered on a
    dollar price basis, the rate of return on an investment in Units of each
    Trust is measured in terms of "Estimated Current Return" and "Estimated
    Long Term Return".

          Estimated Long Term Return is calculated by:  (1) computing the
    yield to maturity or to an earlier call date (whichever results in a lower
    yield) for each Bond in the Trust's portfolio in accordance with accepted
    bond practices, which practices take into account not only the interest
    payable on the Bond but also the amortization of premiums or accretion of
    discounts, if any; (2) calculating the average of the yields for the Bonds
    in the Trust's portfolio by weighing each Bond's yield by the market value
    of the Bond and by the amount of time remaining to the date to which the
    Bond is priced (thus creating an average yield for the portfolio of the
    Trust); and (3) reducing the average yield for the portfolio of the Trust
    in order to reflect estimated fees and expenses of the Trust and the
    maximum sales charge paid by investors.  The resulting Estimated Long Term
    Return represents a measure of the return to investors earned over the
    estimated life of the Trust.  (For the Estimated Long Term Return to
    Certificateholders under the monthly, semi-annual and annual distribution
    plans, see "Summary of Essential Information".)

          Estimated Current Return is a measure of the Trust's cash flow. 
    Estimated Current Return is computed by dividing the Estimated Net Annual
    Interest Income per Unit by the Public Offering Price per Unit.  In
    contrast to the Estimated Long Term Return, the Estimated Current Return
    does not take into account the amortization of premium or accretion of
    discount, if any, on the Bonds in the portfolio of the Trust.  Moreover,
    because interest rates on Bonds purchased at a premium are generally
    higher than current interest rates on newly issued bonds of a similar type
    with comparable rating, the Estimated Current Return per Unit may be
    affected adversely if such Bonds are redeemed prior to their maturity.

          The Estimated Net Annual Interest Income per Unit of the Trust will
    vary with changes in the fees and expenses of the Trustee and the
    Evaluator applicable to the Trust and with the redemption, maturity, sale
    or other disposition of the Bonds in the Trust.  The Public Offering Price
    will vary with changes in the bid prices of the Bonds.  Therefore, there
    is no assurance that the present Estimated Current Return or Estimated
    Long Term Return will be realized in the future.  (For the Estimated
    Current Return to Certificateholders under the monthly, semi-annual and
    annual distribution plans, see "Summary of Essential Information".  See
    "Estimated Long Term Return and Estimated Current Return" in Part B of
    this Prospectus.)

          A schedule of cash flow projections is available from the Sponsor
    upon request.
        

          DISTRIBUTIONS.  Distributions of interest income, less expenses,
    will be made by the Trust either monthly, semi-annually or annually
    depending upon the plan of distribution applicable to the Unit purchased. 
    A purchaser of a Unit in the secondary market will initially receive
    distributions in accordance with the distribution plan chosen by the prior
    owner of such Unit and may thereafter change the plan as provided under
    "Interest and Principal Distributions" in Part B of this Prospectus. 
    Distributions of principal, if any, will be made semi-annually on June 15
    and December 15 of each year.  (See "Rights of Certificateholders--
    Interest and Principal Distributions" in Part B of this Prospectus.  For
    estimated monthly, semi-annual and annual interest distributions, see
    "Summary of Essential Information.")

       
          MARKET FOR UNITS.  The Sponsor, although not obligated to do so,
    intends to maintain a secondary market for the Units at prices based on
    the aggregate bid price of the Bonds in the Trust portfolio.  The reoffer
    price will be based on the aggregate bid price of the Bonds plus a sales
    charge of 5.5% of the Public Offering Price (5.820% of the net amount
    invested), plus net accrued interest.  If a market is not maintained a
    Certificateholder will be able to redeem his Units with the Trustee at a
    price also based on the aggregate bid price of the Bonds.  (See
    "Liquidity--Sponsor Repurchase" and "Public Offering--Offering Price" in
    Part B of this Prospectus.)
        

          TOTAL REINVESTMENT PLAN.  Certificateholders under the semi-annual
    and annual plans of distribution have the opportunity to have all their
    regular interest distributions, and principal distributions, if any,
    reinvested in available series of "Insured Municipal Securities Trust" or
    "Municipal Securities Trust."  (See "Total Reinvestment Plan" in Part B of
    this Prospectus.  Residents of Texas see "Total Reinvestment Plan for
    Texas Residents" in Part B of this Prospectus.)  The Plan is not designed
    to be a complete investment program. 



    <PAGE>

       
                        INSURED MUNICIPAL SECURITIES TRUST
                               23RD DISCOUNT SERIES

               SUMMARY OF ESSENTIAL INFORMATION AS OF JUNE 30, 1994

     Date of Deposit:  September 4, 1986        Weighted Average Life to 
     Principal Amount of Bonds ...$10,000,000    Maturity:  18.3 Years.
     Number of Units .............12,985        Minimum Value of Trust:
     Fractional Undivided Inter-                 Trust may be terminated if
       est in Trust per Unit .....1/12985        value of Trust is less than
     Principal Amount of                         $5,200,000 in principal
       Bonds per Unit ............$770.12        amount of Bonds.
     Secondary Market Public                    Mandatory Termination Date:
       Offering Price**                          The earlier of December 31,
       Aggregate Bid Price                       2035 or the disposition of
         of Bonds in Trust .......$5,368,346+++  the last Bond in the Trust.
       Divided by 12,985 Units ...$413.43       Trustee***:  United States
       Plus Sales Charge of 5.5%                 Trust Company of New York.
         of Public Offering Price $24.06        Trustee's Annual Fee:  Monthly 
       Public Offering Price                     plan $1.03 per $1,000; semi-
         per Unit ................$437.49+       annual plan $.55 per $1,000;
     Redemption and Sponsor's                    and annual plan is $.36 per
       Repurchase Price                          $1,000.
       per Unit ..................$413.43+      Evaluator:  Kenny S&P
                                         +++     Evaluation Services. 
                                         ++++   Evaluator's Fee for Each
     Excess of Secondary Market                  Evaluation:  Minimum of $12
       Public Offering Price                     plus $.25 per each issue of
       over Redemption and                       Bonds in excess of 50 issues
       Sponsor's Repurchase                      (treating separate maturities
       Price per Unit ............$24.06++++     as separate issues).
     Difference between Public                  Sponsor:  Bear, Stearns & Co.
       Offering Price per Unit                   Inc.
       and Principal Amount per                 Sponsor's Annual Fee:  Maximum
       Unit Premium/(Discount) ...$(332.63)      of $.15 per $1,000 principal
     Evaluation Time:  4:00 p.m.                 amount of Bonds (see "Trust
       New York Time.                            Expenses and Charges" in
     Minimum Principal Distribution:             Part B of this Prospectus).
       $1.00 per Unit.

        PER UNIT INFORMATION BASED UPON INTEREST DISTRIBUTION PLAN ELECTED

                                            Monthly   Semi-Annual   Annual
                                            Option      Option      Option
    Gross annual interest income# ......... $33.29      $33.29      $33.29
    Less estimated annual fees and
      expenses ............................   1.51         .98         .81
    Estimated net annual interest           ______      ______      ______
      income (cash)# ...................... $31.78      $32.31      $32.48
    Estimated interest distribution# ......   2.64       16.15       32.48
    Estimated daily interest accrual# .....  .0882       .0897       .0902
    Estimated current return#++ ...........  7.26%       7.39%       7.42%
    Estimated long term return++ ..........  5.03%       5.15%       5.19%
    Record dates .......................... 1st of      Dec. 1 and   Dec. 1
                                            each month  June 1
    Interest distribution dates ........... 15th of     Dec. 15 and  Dec. 15
                                            each month  June 15
        
    <PAGE>
       *  The Date of Deposit is the date on which the Trust Agreement was
          signed and the deposit of the Bonds with the Trustee made.

      **  For information regarding offering price per Unit and applicable
          sales charge under the Total Reinvestment Plan, see "Total
          Reinvestment Plan" in Part B of this Prospectus. 

     ***  The Trustee maintains its corporate trust office at 770 Broadway,
          New York, New York 10003 (tel. no. 1-800-428-8890).  For information
          regarding redemption by the trustee, see "Trustee Redemption" in
          Part B of this Prospectus.
       
       +  Plus accrued interest to the expected date of settlement
          (approximately five business days after purchase) of $7.27 monthly,
          $9.73 semi-annually and $28.32 annually. 
        
      ++  The estimated current return and estimated long term return are
          increased for transactions entitled to a discount (see "Employee
          Discounts" in Part B of this Prospectus), and are higher under the
          semi-annual and annual options due to lower Trustee's fees and
          expenses.

     +++  Based solely upon the bid side evaluation of the underlying Bonds
          (including, where applicable, undistributed cash from the principal
          account).  Upon tender for redemption, the price to be paid will be
          calculated as described under "Trustee Redemption" in Part B of this
          Prospectus. 

    ++++  See "Comparison of Public Offering Price, Sponsor's Repurchase Price
          and Redemption Price" in Part B of this Prospectus. 


       #  Does not include income accrual from original issue discount bonds,
          if any.

    <PAGE>
       

                          INFORMATION REGARDING THE TRUST
                                AS OF JUNE 30, 1994


    DESCRIPTION OF PORTFOLIO

          The portfolio of the Trust consists of 16 issues representing
    obligations of issuers located in 9 states and the District of Columbia. 
    The Sponsor has not participated as a sole underwriter or manager, co-
    manager or member of an underwriting syndicate from which any of the
    initial aggregate principal amount of the Bonds were acquired. 
    Approximately 51% of the Bonds are obligations of state and local housing
    authorities; approximately 6.5% are hospital revenue bonds; approximately
    5.6% were issued in connection with the financing of nuclear generating
    facilities; and none are "mortgage subsidy" bonds.  All of the Bonds in
    the Trust are subject to redemption prior to their stated maturity dates
    pursuant to sinking fund or call provisions.  The Bonds may also be
    subject to other calls, which may be permitted or required by events which
    cannot be predicted (such as destruction, condemnation, termination of a
    contract, or receipt of excess or unanticipated revenues).  One issue
    representing $500,000 of the principal amount of the Bonds is a general
    obligation bond.  All 15 of the remaining issues representing $9,500,000
    of the principal amount of the Bonds are payable from the income of a
    specific project or authority and are not supported by the issuer's power
    to levy taxes.  The portfolio is divided for purpose of issue as follows: 
    Coal Power 2, Community Redevelopment 1, Federally Insured Mortgage 3,
    Hospital 2, Hydro Electric 1, Nuclear Power 2, Sales Tax 1, Sewer 1, Waste
    Water 1 and Water 1.  For an explanation of the significance of these
    factors see "The Trust--Portfolio" in Part B of this Prospectus. 

          As of June 30, 1994, $5,105,000 (approximately 51% of the aggregate
    principal amount of the Bonds) were original issue discount bonds.  Of
    these original issue discount bonds, $5,105,000 (approximately 51% of the
    aggregate principal amount of the Bonds) were Zero Coupon Bonds.  Zero
    Coupon Bonds do not provide for the payment of any current interest and
    provide for payment at maturity at par value unless sooner sold or
    redeemed.  The market value of Zero Coupon Bonds is subject to greater
    fluctuations than coupon bonds in response to changes in interest rates. 
    None of the aggregate principal amount of the Bonds in the Trust were
    purchased at a "market" discount from par value at maturity, approximately
    49% were purchased at a premium and none were purchased at par.  For an
    explanation of the significance of these factors see "Discount and Zero
    Coupon Bonds" in Part B of this Prospectus. 
        
          None of the Bonds in the Trust are subject to the federal individual
    alternative minimum tax under the Tax Reform Act of 1986.  See "Tax
    Status" in Part B of this Prospectus. 


    <PAGE>
                       FINANCIAL AND STATISTICAL INFORMATION


    Selected data for each Unit outstanding for the periods listed below:

                                                                    Distribu-
                                                                    tions of
                                          Distributions of Interest Principal
                                         During the Period (per Unit) During
                             Net Asset*            Semi-              the
                  Units Out-   Value     Monthly   Annual   Annual   Period
    Period Ended   standing   Per Unit   Option    Option   Option  (Per Unit)

       
    June 30, 1992   13,000     $576.48   $41.76    $42.44   $42.66     -0- 
    June 30, 1993   13,000      532.06    40.76     41.43    42.64   $39.04
    June 30, 1994   12,985      423.29    37.66     38.26    40.13    83.83


    *     Net Asset Value per Unit is calculated by dividing net assets as
          disclosed in the "Statement of Net Assets" by the number of Units
          outstanding as of the date of the Statement of Net Assets.  See
          Note 5 of Notes to Financial Statements for a description of the
          components of Net Assets.
        
<PAGE>

Independent Auditors' Report


The Sponsor, Trustee and Certificateholders
Insured Municipal Securities Trust, 23rd Discount Series:


We have audited the accompanying statement of net assets, including the
portfolio, of Insured Municipal Securities Trust, 23rd Discount Series as of
June 30, 1994, and the related statements of operations, and changes in net
assets for each of the years in the three year period then ended.  These
financial statements are the responsibility of the Trustee (see note 2).  Our
responsibility is to express an opinion on these financial statements 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 financial statements are free of
material misstatement.  An audit includes examining, on a test basis, evidence
supporting the amounts and disclosures in the financial statements.  Our
procedures included confirmation of securities owned as of June 30, 1994 by
correspondence with the Trustee.  An audit also includes assessing the
accounting principles used and significant estimates made by management, as
well as evaluating the overall financial statement presentation.  We believe
that our audits provide a reasonable basis for our opinion.

In our opinion, the financial statements referred to above present fairly, in
all material respects, the financial position of Insured Municipal Securities
Trust, 23rd Discount Series as of June 30, 1994, and the results of its
operations and the changes in its net assets for each of the years in the
three year period then ended, in conformity with generally accepted accounting
principles.

    KPMG Peat Marwick LLP

New York, New York
September 15, 1994
<PAGE>
<TABLE> 
                INSURED MUNICIPAL SECURITIES TRUST, 23RD DISCOUNT SERIES

                                  Statement of Net Assets

                                       June 30, 1994
<S>                                                                         <C> 
       Investments in marketable securities,
          at market value (cost         $5,704,858)                         $   5,368,270

       Excess of other assets over total liabilities                              128,208
                                                                              ------------

       Net assets (   12,985 units  of fractional undivided
          interest outstanding,     $423.29 per     unit)                   $   5,496,478
                                                                              ============

       See accompanying notes to financial statements.
</TABLE> 
<PAGE>
<TABLE> 
                INSURED MUNICIPAL SECURITIES TRUST, 23RD DISCOUNT SERIES

                              Statements of Operations
<CAPTION>
                                                              Years ended June 30,
                                                 -----------  ---- -----------  ---- -----------
                                                    1994              1993              1992
                                                 -----------       -----------       -----------
<S>                                            <C>                 <C>               <C> 
     Investment income - interest              $    524,058           572,465           586,922
                                                 -----------       -----------       -----------

     Expenses:
        Trustee's fees                               11,832            13,629            13,420
        Evaluator's fees                              3,309             3,412             3,024
        Sponsor's fee                                 1,920             1,920             1,920
                                                 -----------       -----------       -----------

                   Total expenses                    17,061            18,961            18,364
                                                 -----------       -----------       -----------

                   Investment income, net           506,997           553,504           568,558
                                                 -----------       -----------       -----------

     Realized and unrealized gain (loss)
        on investments:
          Net realized loss on bonds
             sold or called                        (112,297)          (25,821)            -
          Unrealized appreciation
            (depreciation) for the year            (225,914)          (63,870)           91,778
                                                 -----------       -----------       -----------

                Net gain (loss) on
                  investments                      (338,211)          (89,691)           91,778
                                                 -----------       -----------       -----------

                Net increase in net
                  assets resulting
                  from operations              $    168,786           463,813           660,336
                                                 ===========       ===========       ===========

     See accompanying notes to financial statements.
</TABLE> 
<PAGE>
<TABLE>
           INSURED MUNICIPAL SECURITIES TRUST, 23RD DISCOUNT SERIES

                       Statements of Changes in Net Assets
<CAPTION>
                                                           Years ended June 30,
                                              ------------- -- ------------- -- -------------
                                                  1994             1993             1992
                                              -------------    -------------    -------------
<S>                                         <C>                <C>              <C>
  Operations:
     Investment income, net                 $      506,997          553,504          568,558
     Net realized loss on bonds
        sold or called                            (112,297)         (25,821)          -
     Unrealized appreciation
       (depreciation) for the year                (225,914)         (63,870)          91,778
                                              -------------    -------------    -------------

                  Net increase in net
                    assets resulting
                    from operations                168,786          463,813          660,336
                                              -------------    -------------    -------------

  Distributions to Certificateholders:
       Investment income                           492,927          533,669          546,668
       Principal                                 1,088,903          507,520           -

  Redemptions:
       Interest                                        134           -                -
       Principal                                     7,152           -                -
                                              -------------    -------------    -------------

  Total distributions and redemptions            1,589,116        1,041,189          546,668
                                              -------------    -------------    -------------

                Total increase (decrease)       (1,420,330)        (577,376)         113,668

  Net assets at beginning of year                6,916,808        7,494,184        7,380,516
                                              -------------    -------------    -------------

  Net assets at end of year (including
     undistributed net investment
     income of  $244,121,   $235,312 and
     $234,828, respectively)                $    5,496,478        6,916,808        7,494,184
                                              =============    =============    =============

  See accompanying notes to financial statements.
</TABLE> 
<PAGE>
INSURED MUNICIPAL SECURITIES TRUST, 23RD DISCOUNT SERIES

Notes to Financial Statements

June 30, 1994, 1993 and 1992


(1)    Organization and Financial and Statistical Information

Insured Municipal Securities Trust, 23rd Discount Series (Trust) was
organized on September 4, 1986 by Bear, Stearns & Co. Inc. (Sponsor)
under the laws of the State of New York by a Trust Indenture and
Agreement, and is registered under the Investment Company Act
of 1940.

(2)    Summary of Significant Accounting Policies

United States Trust Company of New York (Trustee) has custody of and
responsibility for the accounting records and financial statements of
the Trust and is responsible for establishing and maintaining a
system of internal control related thereto.

The Trustee is also responsible for all estimates of expenses and
accruals reflected in the Trust's financial statements.  The
accompanying financial statements have been adjusted to record the
unrealized appreciation (depreciation) of investments and to record
interest income and expenses on the accrual basis.

The discount on the zero-coupon bonds is accreted by the interest
method over the respective lives of the bonds.  The accretion of such
discount is included in interest income; however, it is not
distributed until realized in cash upon maturity or sale of the
respective bonds.

Investments are carried at market value which is determined by either
Standard & Poor's Corporation or Moody's Investors Service, Inc.
(Evaluator) as discussed in Footnotes to Portfolio. The market value
of the investments is based upon the bid prices for the bonds at the
end of the year, except that the market value on the date of deposit
represents the cost to the Trust based on the offering prices for
investments at that date.  The difference between cost (including
accumulated accretion of original issue discount on zero-coupon
bonds) and market value is reflected as unrealized appreciation
(depreciation) of investments.  Securities transactions are recorded
on the trade date.  Realized gains (losses) from securities
transactions are determined on the basis of average cost of the
securities sold or redeemed.

(3)    Income Taxes

The Trust is not subject to Federal income taxes as provided for by
the Internal Revenue Code.

(4)    Trust Administration

The fees and expenses of the Trust are incurred and paid on the basis
set forth under "Trust Expenses and Charges" in Part B of this
Prospectus.

The Trust Indenture and Agreement provides for interest distributions
as often as monthly (depending upon the distribution plan elected by
the Certificateholders).

The Trust Indenture and Agreement further requires that principal
received from the disposition of bonds, other than those bonds sold
in connection with the redemption of units, be distributed to
Certificateholders.

See "Financial and Statistical Information" in Part A of this
Prospectus for the amounts of per unit distributions during the years
ended June 30, 1994, 1993 and 1992.

The Trust Indenture and Agreement also requires the Trust to redeem
units tendered.  15 units were redeemed during the year ended June
30, 1994.  No units were redeemed during the years ended June 30,
1993 and 1992.

(5)    Net Assets

At June 30, 1994, the net assets of the Trust represented the
interest of Certificateholders as follows:

        Original cost to Certificateholders                $ 7,961,708
        Less initial gross underwriting commission            (437,840)

                                                             7,523,868

        Cost of securities sold or called                   (1,935,000)
        Net unrealized depreciation                           (336,588)
        Undistributed net investment income                    244,121
        Undistributed proceeds from bonds sold or called            77

            Total                                           $ 5,496,478

The original cost to Certificateholders, less the initial gross
underwriting commission, represents the aggregate initial public
offering price net of the applicable sales charge on 13,000 units of
fractional undivided interest of the Trust as of the date of deposit.

Undistributed net investment income includes accumulated accretion of
original issue discount of $115,990.
<PAGE>
<TABLE> 
INSURED MUNICIPAL SECURITIES TRUST, 23RD DISCOUNT SERIES
Portfolio
June 30, 1994
<CAPTION>
Port-     Aggregate                                           Coupon Rate/   Redemption Feature
folio    Principal          Name of Issuer          Ratings   Date(s) of     S.F.--Sinking Fund        Market
No.        Amount         and Title of Bonds          (1)     Maturity(2)    Ref.--Refunding(2)(7)     Value(3)
- -----   -----------   --------------------------    -------   ------------   ----------------------    ---------
<S>  <C>              <C>                           <C>       <C>            <C>                    <C> 
   1 $      500,000   Municipality of Anchorage,      AAA     8.125%         6/01/02 @ 100 S.F.     $    541,450
                      Alaska 1986 General                     6/01/2011      6/01/96 @ 102 Ref.
                      Obligation Water Bonds
                      (Financial Guaranty) (5)

   2        600,000   City of Orlando, Florida        AAA     7.875          10/01/02 @ 100 S.F.         618,984
                      Community Redevelopment                 10/01/2010     10/01/94 @ 102 Ref.
                      Agency Tax Increment
                      Revenue Refunding Bonds,
                      Series 1986 (Financial
                      Guaranty) (5)

   3         65,000   City of Rockport, Indiana       AAA     9.250          No Sinking Fund              69,818
                      Pollution Control Revenue               8/01/2014      8/01/95 @ 102 Ref.
                      Bonds (Indiana and Michigan
                      Electric Company Project)
                      Series 1985A (BIG)

   4        495,000   Louisiana Energy and Power      AAA     8.625          1/01/05 @ 100 S.F.          514,968
                      Authority Power Project                 1/01/2013      1/01/95 @ 102 Ref.
                      Revenue Bonds (Rodemacher
                      Unit No. 2) Series 1985
                      (Financial Guaranty) (5)

   5        200,000   Sulphur, Louisiana Public       AAA     9.500          No Sinking Fund             214,168
                      Improvement Sales and Use               10/01/2000     10/01/95 @ 101 Ref.
                      Tax Revenue Bonds, State
                      Series 1985B (Financial
                      Guaranty) (5)

   6        350,000   Hospital Service District       AAA     9.375          4/01/99 @ 100 S.F.          369,348
                      No. 1 of Parish of                      4/01/2005      4/01/95 @ 102 Ref.
                      Terrebonne, State of
                      Louisiana Hospital Revenue
                      Refunding Bonds (Terrebonne
                      General Medical Center
                      Project) Series 1985 (BIG)
                      (5)

   7        100,000   Hospital Service District       AAA     9.400          4/01/06 @ 100 S.F.          105,546
                      No. 1 of the Parish of                  4/01/2015      4/01/95 @ 102 Ref.
                      Terrebonne, State of
                      Louisiana Hospital Revenue
                      Refunding Bonds (Terrebonne
                      General Medical Center
                      Project) Series 1985 (BIG)
                      (5)

   8        235,000   Ocean County Utilities          AAA     8.700          1/01/07 @ 100 S.F.          253,918
                      Authority, New Jersey                   1/01/2011      1/01/96 @ 102 Ref.
                      Wastewater Revenue
                      Refunding Bonds, Series
                      1985 (Financial Guaranty)
                      (5)

   9        200,000   Texas Health Facilities         AAA     8.375          2/15/02 @ 100 S.F.          221,266
                      Development Corporation                 2/15/2006      2/15/97 @ 102 Ref.
                      Hospital System Revenue
                      Bonds, Series 1986 (All
                      Saints Southwest Hospital,
                      Inc. Project) (Financial
                      Guaranty) (5)

  10  $     500,000   Galveston County Water          AAA     9.000%         7/10/06   @ 100 S.F.    $   541,915
                      Authority (a political                  7/10/2009      7/10/96 @ 100 Ref.
                      subdivision of the State of
                      Texas with boundaries
                      coterminous with those of
                      Galveston County, Texas)
                      Water System Contract
                      Revenue Refunding Bonds,
                      Mainland Project, Series
                      1985 (AMBAC) (5)

  11        430,000   City of Houston, Texas          AAA     9.375          12/01/06 @ 100 S.F.         467,182
                      Sewer System Junior Lien                12/01/2013     12/01/95 @ 102 Ref.
                      Revenue Refunding Bonds,
                      Series 1985 (Financial
                      Guaranty) (5)

  11a        70,000   City of Houston, Texas          AAA     9.375          12/01/06 @ 100 S.F.          76,053
                      Sewer System Junior Lien                12/01/2013     12/01/95 @ 102 Ref.
                      Revenue Refunding Bonds,
                      Series 1985 (Financial
                      Guaranty) (5)

  12        100,000   Intermountain Power  Agency     AAA     9.125          7/01/13 @ 100 S.F.          106,500
                      (a political subdivision of             7/01/2018      7/01/95 @ 102 Ref.
                      the State of Utah) Power
                      Supply Revenue Refunding
                      Bonds, 1985 Series D
                      (AMBAC) (5)

  13        450,000   Intermountain Power Agency      AAA     8.625          7/01/02 @ 100 S.F.          477,063
                      (a political subdivision of             7/01/2005      7/01/95 @ 102 Ref.
                      the State of Utah) Power
                      Supply Revenue Refunding
                      Bonds, 1985 Series J (MBIA)
                      (5)

  14        100,000   Intermountain Power Agency      AAA     8.750          7/01/06 @ 100 S.F.          106,136
                      (a political subdivision of             7/01/2012      7/01/95 @ 102 Ref.
                      the State of Utah) Power
                      Supply Revenue Refunding
                      Bonds, 1985 Series J (MBIA)
                      (5)

  15        500,000   Public Utility District No.     AAA     9.750          6/01/06 @ 100 S.F.          535,640
                      1 of Chelan County,                     6/01/2015      6/01/95 @ 102 Ref.
                      Washington Columbia River
                      Rock Island Hydro-Electric
                      System Revenue Bonds, 1985
                      Series A (AMBAC)

  16        215,000   Housing Authority of the        AAA     0.000          4/01/07 @ 13.074 S.F.         7,351
                      County of Santa Clara                   4/01/2026      10/01/03 @ 8.987 Ref.
                      (California) Multifamily
                      Housing Revenue Bonds,
                      Series 1984A (FHA-Insured
                      Mortgage Loan - Cedar Glen
                      Apartments Project) (MBIA)

  17        100,000   The District of Columbia        AAA     0.000          5/01/05 @ 11.975 S.F.         4,066
                      Multi-Unit Housing Finance              11/01/2025     11/01/08 @ 17.206 Ref.
                      Corporation Mortgage
                      Revenue Bonds, Series 1983
                      (FHA-Insured Mortgage Loan
                      - Congress Park II
                      Apartments, Section 8
                      Assisted Project) (MBIA)

  18  $   4,790,000   District of Columbia            AAA     0.000%         2/01/09 @ 13.943 S.F.   $   136,898
                      Housing Finance Agency                  2/01/2027      2/01/04 @ 8.067 Ref.
                      Multi-Family Mortgage
                      Revenue Bonds, Series 1984
                      (FHA-Insured Mortgage Loan
                      - Benning Heights Project -
                      100% Section 8 Assisted)
                      (MBIA)
        -----------                                                                                    ---------

      $  10,000,000                                                                                 $  5,368,270
        ===========                                                                                    =========

 See accompanying footnotes to portfolio and notes to financial statements.
</TABLE> 
<PAGE>
INSURED MUNICIPAL SECURITIES TRUST, 23RD DISCOUNT SERIES

Footnotes to Portfolio

June 30, 1994

(1)    All ratings are by Standard & Poor's Corporation.  A brief description
of the ratings symbols and their meanings is set forth under
"Description of Bond Ratings" in Part B of this Prospectus.

(2)    See "The Trust - Portfolio" in Part B of this Prospectus for an
explanation of redemption features.  See "Tax Status" in Part B of
this Prospectus for a statement of the Federal tax consequences to a
Certificateholder upon the sale, redemption or maturity of a bond.

(3)    At June 30, 1994, the net unrealized depreciation of all the bonds was
comprised of the following:

    Gross unrealized appreciation                     $    2,405
    Gross unrealized depreciation                       (338,993)

    Net unrealized depreciation                      $  (336,588)

(4)    The annual interest income, based upon bonds held at June 30, 1994,
(excluding accretion of original issue discount on zero-coupon bonds)
to the Trust is $432,301.

(5)    The bonds have been prerefunded and will be redeemed at the next
refunding call date.

(6)    Bonds sold or called after June 30, 1994 are noted in a footnote
    "Changes in Trust Portfolio" under "Description of Portfolio" in Part A
    of this Prospectus.

(7)    The Bonds may also be subject to other calls, which may be permitted or
required by events which cannot be predicted (such as destruction,
condemnation, termination of a contract, or receipt of excess or
unanticipated revenues).

<PAGE>




                 NOTE:  Part A of This Prospectus May Not Be     
                        Distributed Unless Accompanied by Part B.


                        INSURED MUNICIPAL SECURITIES TRUST

                               24TH DISCOUNT SERIES
                              (MULTIPLIER PORTFOLIO)


                                                                              
       
          The Trust is a unit investment trust designated 24th Discount Series
    ("Insured Municipal Discount Trust") with an underlying portfolio of long-
    term insured tax-exempt bonds issued by or on behalf of states,
    municipalities and public authorities and was formed to preserve capital
    and to provide interest income (including, where applicable, earned
    original issue discount) which, in the opinions of bond counsel to the
    respective issuers, is, with certain exceptions, currently exempt from
    regular federal income tax under existing law but may be subject to state
    and local taxes.  Capital gains are subject to tax.  (See "Tax Status" and
    "The Trust--Portfolio" in Part B of this Prospectus.)  The Sponsor is
    Bear, Stearns & Co. Inc.  The value of the Units of the Trust will
    fluctuate with the value of the underlying bonds.  Minimum purchase:  1
    Unit. 

                                                                              


          This Prospectus consists of two parts.  Part A contains the Summary
    of Essential Information as of June 30, 1994 (the "Evaluation Date"), a
    summary of certain specific information regarding the Trust and audited
    financial statements of the Trust, including the related portfolio, as of
    the Evaluation Date.  Part B of this Prospectus contains a general summary
    of the Trust. 
        
                    Investors should retain both parts of this
                         Prospectus for future reference. 

                                                                              


     THESE SECURITIES HAVE NOT BEEN APPROVED OR DISAPPROVED BY THE SECURITIES
     AND EXCHANGE COMMISSION OR ANY STATE SECURITIES COMMISSION NOR HAS THE
     COMMISSION OR ANY STATE SECURITIES COMMISSION PASSED UPON THE ACCURACY OR
     ADEQUACY OF THIS PROSPECTUS.  ANY REPRESENTATION TO THE CONTRARY IS A
     CRIMINAL OFFENSE.
       
                     Prospectus Part A Dated October 28, 1994
        

    <PAGE>
       
          THE TRUST.  The Trust is a unit investment trust formed to preserve
    capital and to provide interest income (including, where applicable,
    earned original issue discount) which, in the opinions of bond counsel to
    the respective issuers, is, with certain exceptions, currently exempt from
    regular federal income tax under existing law through investment in a
    fixed, diversified portfolio of long-term insured bonds (the "Bonds")
    issued by or on behalf of states, municipalities and public authorities
    which, because of irrevocable insurance, are rated "AAA" by Standard &
    Poor's Corporation.  Although the Supreme Court has determined that
    Congress has the authority to subject interest on bonds such as the Bonds
    in the Trust to regular federal income taxation, existing law excludes
    such interest from regular federal income tax.  Such interest income may,
    however, be subject to the federal corporate alternative minimum tax and
    to state and local taxes.  (See "Tax Status" in Part B of this
    Prospectus.)  For a list of ratings on the Evaluation Date, see
    "Portfolio."  The Bonds were acquired at prices which resulted in the
    portfolio as a whole being purchased at a deep discount from par value. 
    The portfolio may also include bonds issued at an original issue discount. 
    Additionally, some of the Bonds in the portfolio may be "Zero Coupon
    Bonds," which are original issue discount bonds that provide for payment
    at maturity at par value, but do not provide for the payment of any
    current interest.  Some of the Bonds in the Trust have been issued with
    optional refunding or refinancing provisions ("Refunded Bonds") whereby
    the issuer of the Bond has the right to call such Bond prior to its stated
    maturity date (and other than pursuant to sinking fund provisions) and to
    issue new bonds ("Refunding Bonds") in order to finance the redemption. 
    Issuers typically utilize refunding calls in order to take advantage of
    lower interest rates in the marketplace.  Some of these Refunded Bonds may
    be called for redemption pursuant to pre-refunding provisions ("Pre-
    Refunded Bonds") whereby the proceeds from the issue of the Refunding
    Bonds are typically invested in government securities in escrow for the
    benefit of the holders of the Pre-Refunded Bonds until the refunding call
    date.  Usually, Pre-Refunded Bonds will bear a triple-A rating because of
    this escrow.  The issuers of Pre-Refunded Bonds must call such Bonds on
    their refunding call date.  Therefore, as of such date, the Trust will
    receive the call price for such bonds but will cease receiving interest
    income with respect to them.  For a list of those Bonds which are Pre-
    Refunded Bonds, if any,  as of the Evaluation Date, see "Notes to
    Financial Statements" in this Part A.  Some of the Bonds in the portfolio
    may have been purchased at an aggregate premium over par.  All of the
    Bonds in the Trust were rated "AAA" by Standard & Poor's Corporation at
    the time originally deposited in the Trust.  This rating results from
    insurance relating only to the Bonds in the Trust and not to the Units of
    the Trust.  The insurance does not remove market risk, as it does not
    guarantee the market value of the Units.  For a discussion of the
    significance of such ratings, see "Description of Bond Ratings" in Part B
    of this Prospectus, and for a list of ratings on the Evaluation Date see
    the "Portfolio."  The payment of interest and preservation of capital are,
    of course, dependent upon the continuing ability of issuers of the Bonds
    or the insurers thereof to meet their obligations.  There can be no
    assurance that the Trust's investment objectives will be achieved. 
    Investment in the Trust should be made with an understanding of the risks
    which an investment in long-term fixed rate debt obligations may entail,
    including the risk that the value of the underlying portfolio will decline
    with increases in interest rates, and that the value of Zero Coupon Bonds
    is subject to greater fluctuation than coupon bonds in response to changes
    in interest rates.  Each Unit in the Trust represents a 1/13085th
    undivided interest in the principal and net income of the Trust.  The
    principal amount of Bonds deposited in the Trust per Unit is reflected in
    the Summary of Essential Information.  (See "Organization" in Part B of
    this Prospectus.)  The Units being offered hereby are issued and
    outstanding Units which have been purchased by the Sponsor in the
    secondary market.

          INSURANCE.  Each of the Bonds in the Trust is insured by a municipal
    bond guaranty insurance policy obtained by either the Sponsor ("Sponsor-
    Insured Bonds") or the issuers of the Bonds ("Pre-Insured Bonds") and
    issued by one of the insurance companies (the "Insurance Companies"),
    described under "Insurance on the Bonds" in Part B of this Prospectus,
    covering scheduled payment of principal thereof and interest thereon when
    such amounts shall become due for payment but shall not have been paid by
    the issuer or any other insurer thereof.  The insurance, unless obtained
    by Municipal Bond Investors Assurance Corporation ("MBIA Corp."), will
    also cover any accelerated payments of principal and the increase in
    interest payments or premiums, if any, payable upon mandatory redemption
    of the Bonds if interest on any Bonds is ultimately deemed to be subject
    to regular federal income tax.  Insurance obtained from MBIA Corp. only
    guarantees the accelerated payments required to be made by or on behalf of
    an issuer of small industrial revenue bonds and pollution control bonds if
    there is an event which results in the loss of tax-exempt status of the
    interest on such Bonds, including principal, interest or premium payments,
    if any, as and when required.  To the extent, therefore, that Bonds are
    only covered by insurance obtained from MBIA Corp., such Bonds will not be
    covered for the accelerated payments required to be made by or on behalf
    of an issuer of other than small industrial revenue bonds or pollution
    control revenue bonds if there occurs an event which results in the loss
    of tax-exempt status of the interest on such Bonds.  None of the insurance
    will cover accelerated payments of principal or penalty interest or
    premiums unrelated to taxability of interest on the Bonds (although the
    insurance, including insurance obtained by MBIA Corp., does guarantee
    payment of principal and interest in such amounts and at such times as
    such amounts would have been due absent such acceleration).  The insurance
    relates only to the prompt payment of principal of and interest on the
    securities in the portfolio, and does not remove market risks or guarantee
    the market value of the Units in the Trust.  The terms of the insurance
    are more fully described under "Insurance on the Bonds" in Part B of this
    Prospectus.  For a discussion of the effect of an occurrence of nonpayment
    of principal or interest on any Bonds in the Trust, see "Portfolio
    Supervision" in Part B of this Prospectus.  No representation is made
    herein as to any Bond insurer's ability to meet its obligations under a
    policy of insurance relating to any of the Bonds.  In addition, investors
    should be aware that, subsequent to the Date of Deposit, the rating of the
    claims-paying ability of the insurer of an underlying Bond may be
    downgraded, which may result in a downgrading of the rating of the Units
    in the Trust.  The approximate percentage of the aggregate principal
    amount of the portfolio that is insured by each Insurance Company is as
    follows:  AMBAC Indemnity Corp. ("AMBAC"), 41.7%; Bond Investors Guaranty
    ("BIG"), 4%; Financial Guaranty Insurance Company ("Financial Guaranty"),
    38.2% and Municipal Bond Insurance Association ("MBIA"), 16.1%.

          PUBLIC OFFERING PRICE.  The secondary market Public Offering Price
    of each Unit is equal to the aggregate bid price of the Bonds in the Trust
    divided by the number of Units outstanding, plus a sales charge of 5.5% of
    the Public Offering Price, or 5.820% of the net amount invested in Bonds
    per Unit.  In addition, accrued interest to the expected date of
    settlement, including earned original issue discount, is added to the
    Public Offering Price.  If Units had been purchased on the Evaluation
    Date, the Public Offering Price per Unit would have been $591.17 plus
    accrued interest of $7.68 under the monthly distribution plan, $11.17
    under the semi-annual distribution plan and $33.97 under the annual
    distribution plan, for a total of $598.85, $602.34 and $625.14,
    respectively.  The Public Offering Price per Unit can vary on a daily
    basis in accordance with fluctuations in the aggregate bid price of the
    Bonds.  (See "Public Offering--Offering Price" in Part B of this
    Prospectus.)

          ESTIMATED LONG TERM RETURN AND ESTIMATED CURRENT RETURN.  Units of
    each Trust are offered to investors on a "dollar price" basis (using the
    computation method previously described under "Public Offering Price") as
    distinguished from a "yield price" basis often used in offerings of tax
    exempt bonds (involving the lesser of the yield as computed to maturity of
    bonds or to an earlier redemption date).  Since they are offered on a
    dollar price basis, the rate of return on an investment in Units of each
    Trust is measured in terms of "Estimated Current Return" and "Estimated
    Long Term Return".

          Estimated Long Term Return is calculated by:  (1) computing the
    yield to maturity or to an earlier call date (whichever results in a lower
    yield) for each Bond in the Trust's portfolio in accordance with accepted
    bond practices, which practices take into account not only the interest
    payable on the Bond but also the amortization of premiums or accretion of
    discounts, if any; (2) calculating the average of the yields for the Bonds
    in the Trust's portfolio by weighing each Bond's yield by the market value
    of the Bond and by the amount of time remaining to the date to which the
    Bond is priced (thus creating an average yield for the portfolio of the
    Trust); and (3) reducing the average yield for the portfolio of the Trust
    in order to reflect estimated fees and expenses of the Trust and the
    maximum sales charge paid by investors.  The resulting Estimated Long Term
    Return represents a measure of the return to investors earned over the
    estimated life of the Trust.  (For the Estimated Long Term Return to
    Certificateholders under the monthly, semi-annual and annual distribution
    plans, see "Summary of Essential Information".)

          Estimated Current Return is a measure of the Trust's cash flow. 
    Estimated Current Return is computed by dividing the Estimated Net Annual
    Interest Income per Unit by the Public Offering Price per Unit.  In
    contrast to the Estimated Long Term Return, the Estimated Current Return
    does not take into account the amortization of premium or accretion of
    discount, if any, on the Bonds in the portfolio of the Trust.  Moreover,
    because interest rates on Bonds purchased at a premium are generally
    higher than current interest rates on newly issued bonds of a similar type
    with comparable rating, the Estimated Current Return per Unit may be
    affected adversely if such Bonds are redeemed prior to their maturity.

          The Estimated Net Annual Interest Income per Unit of the Trust will
    vary with changes in the fees and expenses of the Trustee and the
    Evaluator applicable to the Trust and with the redemption, maturity, sale
    or other disposition of the Bonds in the Trust.  The Public Offering Price
    will vary with changes in the bid prices of the Bonds.  Therefore, there
    is no assurance that the present Estimated Current Return or Estimated
    Long Term Return will be realized in the future.  (For the Estimated
    Current Return to Certificateholders under the monthly, semi-annual and
    annual distribution plans, see "Summary of Essential Information".  See
    "Estimated Long Term Return and Estimated Current Return" in Part B of
    this Prospectus.)

          A schedule of cash flow projections is available from the Sponsor
    upon request.
        
          DISTRIBUTIONS.  Distributions of interest income, less expenses,
    will be made by the Trust either monthly, semi-annually or annually
    depending upon the plan of distribution applicable to the Unit purchased. 
    A purchaser of a Unit in the secondary market will initially receive
    distributions in accordance with the distribution plan chosen by the prior
    owner of such Unit and may thereafter change the plan as provided under
    "Interest and Principal Distributions" in Part B of this Prospectus. 
    Distributions of principal, if any, will be made semi-annually on June 15
    and December 15 of each year.  (See "Rights of Certificateholders--
    Interest and Principal Distributions" in Part B of this Prospectus.  For
    estimated monthly, semi-annual and annual interest distributions, see
    "Summary of Essential Information.")
       
          MARKET FOR UNITS.  The Sponsor, although not obligated to do so,
    intends to maintain a secondary market for the Units at prices based on
    the aggregate bid price of the Bonds in the Trust portfolio.  The reoffer
    price will be based on the aggregate bid price of the Bonds plus a sales
    charge of 5.5% of the Public Offering Price (5.820% of the net amount
    invested), plus net accrued interest.  If a market is not maintained a
    Certificateholder will be able to redeem his Units with the Trustee at a
    price also based on the aggregate bid price of the Bonds.  (See
    "Liquidity--Sponsor Repurchase" and "Public Offering--Offering Price" in
    Part B of this Prospectus.)
        
          TOTAL REINVESTMENT PLAN.  Certificateholders under the semi-annual
    and annual plans of distribution have the opportunity to have all their
    regular interest distributions, and principal distributions, if any,
    reinvested in available series of "Insured Municipal Securities Trust" or
    "Municipal Securities Trust."  (See "Total Reinvestment Plan" in Part B of
    this Prospectus.  Residents of Texas see "Total Reinvestment Plan for
    Texas Residents" in Part B of this Prospectus.)  The Plan is not designed
    to be a complete investment program. 



    <PAGE>

       
                        INSURED MUNICIPAL SECURITIES TRUST
                               24TH DISCOUNT SERIES

               SUMMARY OF ESSENTIAL INFORMATION AS OF JUNE 30, 1994

     Date of Deposit:  October 2, 1986          Weighted Average Life to
     Principal Amount of Bonds ...$6,810,000     Maturity:  8.2 Years.
     Number of Units .............13,085        Minimum Value of Trust:
     Fractional Undivided Inter-                 Trust may be terminated if
       est in Trust per Unit .....1/13085        value of Trust is less than
     Principal Amount of                         $5,600,000 in principal
       Bonds per Unit ............$520.44        amount of Bonds.
     Secondary Market Public                    Mandatory Termination Date:
       Offering Price**                          The earlier of December 31,
       Aggregate Bid Price                       2035 or the disposition of
         of Bonds in Trust .......$7,310,077+++  the last Bond in the Trust.
       Divided by 13,085 Units ....$558.66      Trustee***:  United States
       Plus Sales Charge of 5.5%                 Trust Company of New York.
         of Public Offering Price $32.51        Trustee's Annual Fee:  Monthly 
       Public Offering Price                     plan $1.04 per $1,000; semi-
         per Unit ................$591.17+       annual plan $.56 per $1,000;
     Redemption and Sponsor's                    and annual plan is $.37 per
       Repurchase Price                          $1,000.
       per Unit ..................$558.66+      Evaluator:  Kenny S&P
                                         +++     Evaluation Services. 
                                         ++++   Evaluator's Fee for Each
     Excess of Secondary Market                  Evaluation:  Minimum of $12
       Public Offering Price                     plus $.25 per each issue of
       over Redemption and                       Bonds in excess of 50 issues
       Sponsor's Repurchase                      (treating separate maturities
       Price per Unit ............$32.51++++     as separate issues).
     Difference between Public                  Sponsor:  Bear, Stearns & Co.
       Offering Price per Unit                   Inc.
       and Principal Amount per                 Sponsor's Annual Fee:  Maximum
       Unit Premium/(Discount) ...$70.73         of $.15 per $1,000 principal
     Evaluation Time:  4:00 p.m.                 amount of Bonds (see "Trust
       New York Time.                            Expenses and Charges" in
     Minimum Principal Distribution:             Part B of this Prospectus).
       $1.00 per Unit.


        PER UNIT INFORMATION BASED UPON INTEREST DISTRIBUTION PLAN ELECTED

                                            Monthly   Semi-Annual   Annual
                                            Option      Option      Option

    Gross annual interest income# ......... $46.48      $46.48      $46.48
    Less estimated annual fees and
      expenses ............................   1.16         .75         .64
    Estimated net annual interest           ______      ______      ______
      income (cash)# ...................... $45.32      $45.73      $45.84
    Estimated interest distribution# ......   3.77       22.86       45.84
    Estimated daily interest accrual# .....  .1258       .1270       .1273
    Estimated current return#++ ...........  7.67%       7.74%       7.75%
    Estimated long term return++ ..........  4.05%       4.12%       4.14%
    Record dates .......................... 1st of      Dec. 1 and   Dec. 1
                                            each month  June 1
    Interest distribution dates ........... 15th of     Dec. 15 and  Dec. 15
                                            each month  June 15
        
    <PAGE>
       *  The Date of Deposit is the date on which the Trust Agreement was
          signed and the deposit of the Bonds with the Trustee made.

      **  For information regarding offering price per Unit and applicable
          sales charge under the Total Reinvestment Plan, see "Total
          Reinvestment Plan" in Part B of this Prospectus. 

     ***  The Trustee maintains its corporate trust office at 770 Broadway,
          New York, New York 10003 (tel. no. 1-800-428-8890).  For information
          regarding redemption by the trustee, see "Trustee Redemption" in
          Part B of this Prospectus.
       
       +  Plus accrued interest to the expected date of settlement
          (approximately five business days after purchase) of $7.68 monthly,
          $11.17 semi-annually and $33.97 annually. 
        
      ++  The estimated current return and estimated long term return are
          increased for transactions entitled to a discount (see "Employee
          Discounts" in Part B of this Prospectus), and are higher under the
          semi-annual and annual options due to lower Trustee's fees and
          expenses.

     +++  Based solely upon the bid side evaluation of the underlying Bonds
          (including, where applicable, undistributed cash from the principal
          account).  Upon tender for redemption, the price to be paid will be
          calculated as described under "Trustee Redemption" in Part B of this
          Prospectus. 

    ++++  See "Comparison of Public Offering Price, Sponsor's Repurchase Price
          and Redemption Price" in Part B of this Prospectus. 

       #  Does not include income accrual from original issue discount bonds,
          if any.

    <PAGE>
       
                          INFORMATION REGARDING THE TRUST
                                AS OF JUNE 30, 1994


    DESCRIPTION OF PORTFOLIO

          The portfolio of the Trust consists of 20 issues representing
    obligations of issuers located in 13 states.  The Sponsor has not
    participated as a sole underwriter or manager, co-manager or member of an
    underwriting syndicate from which any of the initial aggregate principal
    amount of the Bonds were acquired.  None of the Bonds are obligations of
    state and local housing authorities; approximately 17.6% are hospital
    revenue bonds; approximately 17.6% were issued in connection with the
    financing of nuclear generating facilities; and none are "mortgage
    subsidy" bonds.  All of the Bonds in the Trust are subject to redemption
    prior to their stated maturity dates pursuant to sinking fund or call
    provisions.  The Bonds may also be subject to other calls, which may be
    permitted or required by events which cannot be predicted (such as
    destruction, condemnation, termination of a contract, or receipt of excess
    or unanticipated revenues).  One of the issues representing $100,000 of
    the principal amount of the Bonds is a general obligation bond.  Nineteen
    of the remaining issues representing $6,710,000 of the principal amount of
    the Bonds are payable from the income of a specific project or authority
    and are not supported by the issuer's power to levy taxes.  The portfolio
    is divided for purpose of issue as follows:  Airport 1, Coal Power 2,
    College 1, Hospital 4, Nuclear Power 2, Parking System 1, Pollution
    Control 1, Sales Tax 1, Sewer System 1, Tourist 1, Utility and
    Reclamation 1, Waste Water 1, and Water Revenue 2.  For an explanation of
    the significance of these factors see "The Trust--Portfolio" in Part B of
    this Prospectus. 

          As of June 30, 1994, none of the Bonds were original issue discount
    bonds.  None of the aggregate principal amount of the Bonds in the Trust
    were purchased at a "market" discount from par value at maturity,
    approximately 100% were purchased at a premium and none were purchased at
    par.  For an explanation of the significance of these factors see
    "Discount and Zero Coupon Bonds" in Part B of this Prospectus. 

        

          None of the Bonds in the Trust are subject to the federal individual
    alternative minimum tax under the Tax Reform Act of 1986.  See "Tax
    Status" in Part B of this Prospectus. 


    <PAGE>
                       FINANCIAL AND STATISTICAL INFORMATION


    Selected data for each Unit outstanding for the periods listed below:

                                                                    Distribu-
                                                                    tions of
                                          Distributions of Interest Principal
                                         During the Period (per Unit) During
                             Net Asset*            Semi-              the
                  Units Out-   Value     Monthly   Annual   Annual   Period
    Period Ended   standing   Per Unit   Option    Option   Option  (Per Unit)
       
    June 30, 1992  $13,786     $602.71   $44.92    $45.33   $45.28     -0- 
    June 30, 1993   13,786      602.45    44.88     45.38    45.50     -0- 
    June 30, 1994   13,085      571.18    44.95     45.45    45.50     -0- 





        
    *     Net Asset Value per Unit is calculated by dividing net assets as
          disclosed in the "Statement of Net Assets" by the number of Units
          outstanding as of the date of the Statement of Net Assets.  See
          Note 5 of Notes to Financial Statements for a description of the
          components of Net Assets.
<PAGE>


Independent Auditors' Report

The Sponsor, Trustee and Certificateholders
Insured Municipal Securities Trust, 24th Discount Series:


We have audited the accompanying statement of net assets, including the
portfolio, of Insured Municipal Securities Trust, 24th Discount Series
as of June 30, 1994, and the related statements of operations, and
changes in net assets for each of the years in the three year period 
then ended.  These financial statements are the responsibility of the
Trustee (see note 2).  Our responsibility is to express an opinion on
these financial statements 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 financial statements
are free of material misstatement.  An audit includes examining, on a
test basis, evidence supporting the amounts and disclosures in the
financial statements.  Our procedures included confirmation of
securities owned as of June 30, 1994, by correspondence with the 
Trustee.  An audit also includes assessing the accounting principles
used and significant estimates made by management, as well as evaluating
the overall financial statement presentation.  We believe that our
audits provide a reasonable basis for our opinion.

In our opinion, the financial statements referred to above present
fairly, in all material respects, the financial position of Insured
Municipal Securities Trust, 24th Discount Series as of June 30, 1994,
and the results of its operations and the changes in its net assets for
each of the years in the three year period then ended, in conformity
with generally accepted accounting principles.


    KPMG Peat Marwick LLP


New York, New York
September 30, 1994
<PAGE>
<TABLE>
               INSURED MUNICIPAL SECURITIES TRUST, 24TH DISCOUNT SERIES

                                Statement of Net Assets

                                     June 30, 1994
<S>                                                                      <C> 
       Investments in marketable securities,
          at market value (cost     $7,580,123)                          $    7,316,760

       Excess of other assets over total liabilities                            157,106
                                                                           -------------

       Net assets ( 13,085 units    of fractional undivided
          interest outstanding,     $571.18 per  unit)                   $    7,473,866
                                                                           =============

       See accompanying notes to financial statements.
</TABLE>
<PAGE>
<TABLE>
               INSURED MUNICIPAL SECURITIES TRUST, 24TH DISCOUNT SERIES

                              Statements of Operations
<CAPTION>
                                                             Years ended June 30,
                                              -------------      -------------      -------------
                                                  1994               1993               1992
                                              -------------      -------------      -------------
<S>                                         <C>                  <C>                <C> 
     Investment income - interest           $      639,430            639,551            654,889
                                              -------------      -------------      -------------

     Expenses:
        Trustee's fees                               8,506              9,201              8,886
        Evaluator's fees                             3,582              3,412              3,024
        Sponsor's fees                               1,163              1,163              1,163
                                              -------------      -------------      -------------

                   Total expenses                   13,251             13,776             13,073
                                              -------------      -------------      -------------

                   Investment income, net          626,179            625,775            641,816
                                              -------------      -------------      -------------

     Realized and unrealized gain (loss)
        on investments:
          Net realized loss on bonds
             sold or called                         (3,608)            -                  -
          Unrealized appreciation
             (depreciation) for the year          (431,263)            (7,720)           212,669
                                              -------------      -------------      -------------

                Net gain (loss) on
                  investments                     (434,871)            (7,720)           212,669
                                              -------------      -------------      -------------

                Net increase in net
                  assets resulting
                  from operations           $      191,308            618,055            854,485
                                              =============      =============      =============

     See accompanying notes to financial statements.
</TABLE>
<PAGE>
<TABLE> 
              INSURED MUNICIPAL SECURITIES TRUST, 24TH DISCOUNT SERIES

                           Statements of Changes in Net Assets
<CAPTION>
                                                                Years ended June 30,
                                                    ------------    ------------    ------------
                                                        1994            1993            1992
                                                    ------------    ------------    ------------
<S>                                               <C>               <C>             <C> 
      Operations:
         Investment income, net                   $     626,179         625,775         641,816
         Net realized loss on bonds sold
             or called                                   (3,608)         -               -
         Unrealized appreciation (depreciation)
           for the year                                (431,263)         (7,720)        212,669
                                                    ------------    ------------    ------------

                    Net increase in net
                        assets resulting
                        from operations                 191,308         618,055         854,485
                                                    ------------    ------------    ------------

      Distributions to Certificateholders:
         Investment income                              622,000         621,711         621,790
         Principal                                       -               -               -

      Redemptions:
         Interest                                         7,255          -                  625
         Principal                                      393,525          -               18,019
                                                    ------------    ------------    ------------

                    Total distributions and
                      redemptions                     1,022,780         621,711         640,434
                                                    ------------    ------------    ------------

                    Total increase (decrease)          (831,472)         (3,656)        214,051

      Net assets at beginning of year                 8,305,338       8,308,994       8,094,943
                                                    ------------    ------------    ------------

      Net assets at end of year (including
         undistributed net investment
         income of  $163,787,     $185,002 and
         $180,938, respectively)                  $   7,473,866       8,305,338       8,308,994
                                                    ============    ============    ============

      See accompanying notes to financial statements.
</TABLE>
<PAGE>
INSURED MUNICIPAL SECURITIES TRUST, 24TH DISCOUNT SERIES

Notes to Financial Statements

June 30, 1994, 1993 and 1992



(1)    Organization and Financial and Statistical Information

Insured Municipal Securities Trust, 24th Discount Series (Trust) was
organized on October 2, 1986 by Bear, Stearns & co. Inc. (Sponsor)
under the laws of the State of New York by a Trust Indenture and
Agreement, and is registered under the Investment Company Act
of 1940.

(2)    Summary of Significant Accounting Policies

United States Trust Company of New York (Trustee) has custody of and
responsibility for the accounting records and financial statements of
the Trust and is responsible for establishing and maintaining a
system of internal control related thereto.

The Trustee is also responsible for all estimates of expenses and
accruals reflected in the Trust's financial statements.  The
accompanying financial statements have been adjusted to record the
unrealized appreciation (depreciation) of investments and to record
interest income and expenses on the accrual basis.

Investments are carried at market value which is determined by either
Standard & Poor's Corporation or Moody's Investors Service, Inc.
(Evaluator) as discussed in the footnotes to the portfolio.  The
market value of the investments is based upon the bid prices for the
bonds at tHe end of the year, except that the market value on the
date of deposit represents the cost to the Trust based on the
offering prices for investments at that date.  The difference between
cost and market value is reflected as unrealized appreciation
(depreciation) of investments.  Securities transactions are recorded
on the trade date.  Realized gains (losses) from securities
transactions are determined on the basis of average cost of the
securities sold or redeemed.

(3)    Income Taxes

The Trust is not subject to Federal income taxes as provided for by
the Internal Revenue Code.

(4)    Trust Administration

The fees and expenses of the Trust are incurred and paid on the basis
set forth under "Trust Expenses and Charges" in Part B of this
Prospectus.

The Trust Indenture and Agreement provides for interest distributions
as often as monthly (depending upon the distribution plan elected by
the Certificateholders).

The Trust Indenture and Agreement further requires that principal
received from the disposition of bonds, other than those bonds sold
in connection with the redemption of units, be distributed to
Certificateholders.

See "Financial and Statistical Information" in Part A of this
Prospectus for the amounts of per unit distributions during the years
ended June 30, 1994, 1993 and 1992.

The Trust Indenture and Agreement also requires the Trust to redeem
units tendered.  701 units and 31 units were redeemed during the
years ended June 30, 1994 and 1992, respectively.  No units were
redeemed during the year ended June 30, 1993.

(5)    Net Assets

At June 30, 1994, the net assets of the Trust represented the
interest of Certificateholders as follows:

        Original cost to Certificateholders                $ 8,612,251
        Less initial gross underwriting commission            (473,620)

                                                             8,138,631

        Cost of securities sold or called                     (558,508)
        Net unrealized depreciation                           (263,363)
        Undistributed net investment income                    163,787
        Distributions in excess of proceeds from
               bonds sold or called                             (6,681)

            Total                                          $ 7,473,866


The original cost to Certificateholders, less the initial gross
underwriting commission, represents the aggregate initial public
offering price net of the applicable sales charge on 14,000 units of
fractional undivided interest of the Trust as of the date of deposit.
<PAGE>
<TABLE>
INSURED MUNICIPAL SECURITIES TRUST, 24TH DISCOUNT SERIES
Portfolio
June 30, 1994
<CAPTION>
Port-   Aggregate                                     Coupon Rate/   Redemption Feature
folio  Principal       Name of Issuer       Ratings   Date(s) of     S.F.--Sinking Fund       Market
No.      Amount      and Title of Bonds       (1)     Maturity(2)    Ref.--Refunding(2)(7)    Value(3)
- ---   -----------   ---------------------   -------   ------------   ---------------------    ---------
<S><C>              <C>                     <C>       <C>            <C>                   <C>  
 1 $      500,000   City and County of        AAA     8.000%         Currently @ 100 S.F.  $    540,485
                    Denver, Colorado                  10/01/2015     10/01/96 @ 101 Ref.
                    Children's Hospital
                    Revenue Refunding
                    Bonds (Financial
                    Guaranty) (5)

 2        500,000   Orange County,            AAA     7.750          10/01/05 @ 100 S.F.        543,100
                    Florida Tourist                   10/01/2013     10/01/96 @ 102 Ref.
                    Development Tax
                    Revenue Bonds, Series
                    1986 (AMBAC) (5)

 3         50,000   City of Orlando,          AAA     8.875          10/01/01 @ 100 S.F.         53,576
                    Florida Waste Water               10/01/2014     10/01/95 @ 102 Ref.
                    System Revenue Bonds,
                    1985 Series A (AMBAC)
                    (5)

 4        500,000   Municipal Electric        AAA     9.000          1/01/18 @ 100 S.F.         522,375
                    Authority of Georgia              1/01/2020      1/01/95 @ 102 Ref.
                    Power Revenue Bonds,
                    Series 1985 K (AMBAC)

 5        100,000   Chicago (Illinois)        AAA     8.750          6/01/06 @ 100 S.F.         105,793
                    School Finance                    6/01/2009      6/01/95 @ 102 Ref.
                    Authority General
                    School Assistance
                    Bonds Refunding
                    Series (1985)
                    (Financial Guaranty)
                    (5)

 6        145,000   Kenton County,            AAA     9.100          No Sinking Fund            153,130
                    Kentucky Water                    2/01/2007      2/01/95 @ 103 Ref.
                    District #1
                    Waterworks Revenue
                    Bonds (AMBAC) (5)

 7        270,000   Jefferson Sales Tax       AAA     8.000          7/01/92 @ 100 S.F.         304,952
                    District, Jefferson               7/01/2005      7/01/99 @ 100 Ref.
                    Parish, Louisiana
                    Special Sales Tax
                    Revenue Bonds, Series
                    1986 A (BIG) (5)

 8        500,000   Little Blue Valley,       AAA     8.600          10/01/97 @ 100 S.F.        527,525
                    Missouri Sewer                    10/01/2000     10/01/95 @ 100 Ref.
                    District (Jackson and
                    Cass Counties) Sewer
                    System Revenue
                    Refunding Bonds
                    (AMBAC)

 9        700,000   City of Farmington,       AAA     9.750          5/15/06 @ 100 S.F.         777,105
                    New Mexico Utility                5/15/2013      5/15/96 @ 102 Ref.
                    System Revenue Bonds
                    Series 1985
                    (Financial Guaranty)
                    (5)

10        315,000   Mercer County, North      AAA     10.500         6/30/09 @ 100 S.F.         331,402
                    Dakota Pollution                  6/30/2013      12/30/94 @ 102 Ref.
                    Control Revenue
                    Bonds, Series 1984
                    (Basin Electric Power
                    Cooperative -
                    Antelope Valley
                    Station) (AMBAC)

11        335,000   Oklahoma Water            AAA     8.700          6/01/00 @ 100 S.F.         349,210
                    Resources Board State             12/01/2005     6/01/95 @ 100 Ref.
                    Loan Program Revenue
                    Bonds, Series 1985
                    (AMBAC)

12 $      450,000   Central Oklahoma          AAA     8.000%         7/01/01 @ 100 S.F.    $    485,906
                    Transportation and                7/01/2006      7/01/96 @ 102 Ref.
                    Parking Authority
                    (Oklahoma City,
                    Oklahoma) Parking
                    System Revenue Bonds
                    Refunding Series 1986
                    (AMBAC)

13        700,000   Metropolitan              AAA     9.750          7/01/05 @ 100 S.F.         752,549
                    Nashville Airport                 7/01/2015      7/01/95 @ 102 Ref.
                    Authority (Tennessee)
                    Revenue Bonds, Series
                    1985 (Financial
                    Guaranty)

14        100,000   Albilene (Texas)          AAA     9.500          9/01/06 @ 100 S.F.         108,085
                    Health Facilities                 9/01/2013      9/01/95 @ 102 Ref.
                    Development
                    Corporation Hospital
                    Refunding and Revenue
                    Bonds (Hendrick
                    Medical Center
                    Project) Series 1985
                    (Financial Guaranty)

15        150,000   Dallas County (Texas)     AAA     7.750          2/15/09 @ 100 S.F.         159,668
                    Utility and                       2/15/2011      8/15/96 @ 100 Ref.
                    Reclamation District
                    Unlimited Ad Valorem
                    Tax Refunding Bonds
                    Series 1986A (MBIA)
                    (5)

16        500,000   Tarrant County            AAA     9.750          9/01/03 @ 100 S.F.         539,310
                    (Texas) Health                    9/01/2015      9/01/95 @ 102 Ref.
                    Facilities
                    Development
                    Corporation Health
                    System Revenue Bonds
                    Harris Methodist
                    Health System Series
                    1985 (Financial
                    Guaranty) (5)

17        650,000   Intermountain Power       AAA     8.750          7/01/06 @ 100 S.F.         689,884
                    Agency (a political               7/01/2012      7/01/95 @ 102 Ref.
                    subdivision of the
                    State of Utah) Power
                    Supply System Revenue
                    Refunding Bonds 1985
                    Series J (MBIA) (5)

18         45,000   Intermountain Power       AAA     9.125          7/01/13 @ 100 S.F.          47,925
                    Agency (a political               7/01/2018      7/01/95 @ 102 Ref.
                    subdivision of the
                    State of Utah) Power
                    Supply System Revenue
                    Refunding Bonds, 1985
                    Series D (AMBAC) (5)

19        200,000   Weber State College,      AAA     9.300          No Sinking Fund            218,431
                    Utah Revenue                      4/01/2001      4/01/96 @ 101 Ref.
                    Refunding Bonds
                    (MBIA)

20        100,000   The County Commission     AAA     9.375          6/01/01 @ 100 S.F.         106,349
                    of Monongalia County              6/01/2018      6/01/95 @ 102 Ref.
                    Hospital Revenue
                    Bonds West Virginia
                    University Hospital,
                    Inc. Issue Series
                    1985 A (MBIA) (5)
      -----------                                                                             ---------

    $   6,810,000                                                                          $  7,316,760
      ===========                                                                             =========

 See accompanying footnotes to portfolio and notes to the financial statements
</TABLE>
<PAGE>
INSURED MUNICIPAL SECURITIES TRUST, 24TH DISCOUNT SERIES

Footnotes to Portfolio

June 30, 1994


(1)    All ratings are by Standard & Poor's Corporation.  A brief
description of the ratings symbols and their meanings is set forth under
"Description of Bond Ratings" in Part B of this Prospectus.

(2)    See "The Trust - Portfolio" in Part B of this Prospectus for an
explanation of redemption features.  See "Tax Status" in Part B of
this Prospectus for a statement of the Federal tax consequences to a
Certificateholder upon the sale, redemption or maturity of a bond.

(3)    At June 30, 1994, the net unrealized depreciation of all the
bonds was comprised of the following:

    Gross unrealized appreciation                      $  78,177
    Gross unrealized depreciation                       (341,540)

    Net unrealized depreciation                       $ (263,363)

(4)    The annual interest income, based upon bonds held at June 30, 
1994, (excluding accretion of original issue discount on zero-coupon 
bonds) to the Trust is $ 608,284.

(5)    The bonds have been prerefunded and will be redeemed at the next
refunding call date.

(6)    Bonds sold or called after June 30, 1994 are noted in a footnote
"Changes in Trust Portfolio" under "Description of Portfolio" in Part A
of this Prospectus.

(7)    The Bonds may also be subject to other calls, which may be
permitted or required by events which cannot be predicted (such as
destruction, condemnation, termination of a contract, or receipt of
excess or unanticipated revenues).

<PAGE>

                 NOTE:  Part A of This Prospectus May Not Be     
                        Distributed Unless Accompanied by Part B.


                        INSURED MUNICIPAL SECURITIES TRUST

                               25TH DISCOUNT SERIES
                              (MULTIPLIER PORTFOLIO)


                                                                              
       
          The Trust is a unit investment trust designated 25th Discount Series
    ("Insured Municipal Discount Trust") with an underlying portfolio of long-
    term insured tax-exempt bonds issued by or on behalf of states,
    municipalities and public authorities and was formed to preserve capital
    and to provide interest income (including, where applicable, earned
    original issue discount) which, in the opinions of bond counsel to the
    respective issuers, is, with certain exceptions, currently exempt from
    regular federal income tax under existing law but may be subject to state
    and local taxes.  Capital gains are subject to tax.  (See "Tax Status" and
    "The Trust--Portfolio" in Part B of this Prospectus.)  The Sponsor is
    Bear, Stearns & Co. Inc.  The value of the Units of the Trust will
    fluctuate with the value of the underlying bonds.  Minimum purchase:  1
    Unit. 

                                                                              


          This Prospectus consists of two parts.  Part A contains the Summary
    of Essential Information as of June 30, 1994 (the "Evaluation Date"), a
    summary of certain specific information regarding the Trust and audited
    financial statements of the Trust, including the related portfolio, as of
    the Evaluation Date.  Part B of this Prospectus contains a general summary
    of the Trust. 
        
                    Investors should retain both parts of this
                         Prospectus for future reference. 

                                                                              


     THESE SECURITIES HAVE NOT BEEN APPROVED OR DISAPPROVED BY THE SECURITIES
     AND EXCHANGE COMMISSION OR ANY STATE SECURITIES COMMISSION NOR HAS THE
     COMMISSION OR ANY STATE SECURITIES COMMISSION PASSED UPON THE ACCURACY OR
     ADEQUACY OF THIS PROSPECTUS.  ANY REPRESENTATION TO THE CONTRARY IS A
     CRIMINAL OFFENSE.

       
                     Prospectus Part A Dated October 28, 1994

        
    <PAGE>
       
          THE TRUST.  The Trust is a unit investment trust formed to preserve
    capital and to provide interest income (including, where applicable,
    earned original issue discount) which, in the opinions of bond counsel to
    the respective issuers, is, with certain exceptions, currently exempt from
    regular federal income tax under existing law through investment in a
    fixed, diversified portfolio of long-term insured bonds (the "Bonds")
    issued by or on behalf of states, municipalities and public authorities
    which, because of irrevocable insurance, are rated "AAA" by Standard &
    Poor's Corporation.  Although the Supreme Court has determined that
    Congress has the authority to subject interest on bonds such as the Bonds
    in the Trust to regular federal income taxation, existing law excludes
    such interest from regular federal income tax.  Such interest income may,
    however, be subject to the federal corporate alternative minimum tax and
    to state and local taxes.  (See "Tax Status" in Part B of this
    Prospectus.)  For a list of ratings on the Evaluation Date, see
    "Portfolio."  The Bonds were acquired at prices which resulted in the
    portfolio as a whole being purchased at a deep discount from par value. 
    The portfolio may also include bonds issued at an original issue discount. 
    Additionally, some of the Bonds in the portfolio may be "Zero Coupon
    Bonds," which are original issue discount bonds that provide for payment
    at maturity at par value, but do not provide for the payment of any
    current interest.  Some of the Bonds in the Trust have been issued with
    optional refunding or refinancing provisions ("Refunded Bonds") whereby
    the issuer of the Bond has the right to call such Bond prior to its stated
    maturity date (and other than pursuant to sinking fund provisions) and to
    issue new bonds ("Refunding Bonds") in order to finance the redemption. 
    Issuers typically utilize refunding calls in order to take advantage of
    lower interest rates in the marketplace.  Some of these Refunded Bonds may
    be called for redemption pursuant to pre-refunding provisions ("Pre-
    Refunded Bonds") whereby the proceeds from the issue of the Refunding
    Bonds are typically invested in government securities in escrow for the
    benefit of the holders of the Pre-Refunded Bonds until the refunding call
    date.  Usually, Pre-Refunded Bonds will bear a triple-A rating because of
    this escrow.  The issuers of Pre-Refunded Bonds must call such Bonds on
    their refunding call date.  Therefore, as of such date, the Trust will
    receive the call price for such bonds but will cease receiving interest
    income with respect to them.  For a list of those Bonds which are Pre-
    Refunded Bonds, if any, as of the Evaluation Date, see "Notes to Financial
    Statements" in this Part A.  Some of the Bonds in the portfolio may have
    been purchased at an aggregate premium over par.  All of the Bonds in the
    Trust were rated "AAA" by Standard & Poor's Corporation at the time
    originally deposited in the Trust.  This rating results from insurance
    relating only to the Bonds in the Trust and not to the Units of the Trust. 
    The insurance does not remove market risk, as it does not guarantee the
    market value of the Units.  For a discussion of the significance of such
    ratings, see "Description of Bond Ratings" in Part B of this Prospectus,
    and for a list of ratings on the Evaluation Date see the "Portfolio."  The
    payment of interest and preservation of capital are, of course, dependent
    upon the continuing ability of issuers of the Bonds or the insurers
    thereof to meet their obligations.  There can be no assurance that the
    Trust's investment objectives will be achieved.  Investment in the Trust
    should be made with an understanding of the risks which an investment in
    long-term fixed rate debt obligations may entail, including the risk that
    the value of the underlying portfolio will decline with increases in
    interest rates, and that the value of Zero Coupon Bonds is subject to
    greater fluctuation than coupon bonds in response to changes in interest
    rates.  Each Unit in the Trust represents a 1/13850th undivided interest
    in the principal and net income of the Trust.  The principal amount of
    Bonds deposited in the Trust per Unit is reflected in the Summary of
    Essential Information.  (See "Organization" in Part B of this Prospectus.) 
    The Units being offered hereby are issued and outstanding Units which have
    been purchased by the Sponsor in the secondary market. 

          INSURANCE.  Each of the Bonds in the Trust is insured by a municipal
    bond guaranty insurance policy obtained by either the Sponsor ("Sponsor-
    Insured Bonds") or the issuers of the Bonds ("Pre-Insured Bonds") and
    issued by one of the insurance companies (the "Insurance Companies"),
    described under "Insurance on the Bonds" in Part B of this Prospectus,
    covering scheduled payment of principal thereof and interest thereon when
    such amounts shall become due for payment but shall not have been paid by
    the issuer or any other insurer thereof.  The insurance, unless obtained
    by Municipal Bond Investors Assurance Corporation ("MBIA Corp."), will
    also cover any accelerated payments of principal and the increase in
    interest payments or premiums, if any, payable upon mandatory redemption
    of the Bonds if interest on any Bonds is ultimately deemed to be subject
    to regular federal income tax.  Insurance obtained from MBIA Corp. only
    guarantees the accelerated payments required to be made by or on behalf of
    an issuer of small industrial revenue bonds and pollution control bonds if
    there is an event which results in the loss of tax-exempt status of the
    interest on such Bonds, including principal, interest or premium payments,
    if any, as and when required.  To the extent, therefore, that Bonds are
    only covered by insurance obtained from MBIA Corp., such Bonds will not be
    covered for the accelerated payments required to be made by or on behalf
    of an issuer of other than small industrial revenue bonds or pollution
    control revenue bonds if there occurs an event which results in the loss
    of tax-exempt status of the interest on such Bonds.  None of the insurance
    will cover accelerated payments of principal or penalty interest or
    premiums unrelated to taxability of interest on the Bonds (although the
    insurance, including insurance obtained by MBIA Corp., does guarantee
    payment of principal and interest in such amounts and at such times as
    such amounts would have been due absent such acceleration).  The insurance
    relates only to the prompt payment of principal of and interest on the
    securities in the portfolio, and does not remove market risks or guarantee
    the market value of the Units in the Trust.  The terms of the insurance
    are more fully described under "Insurance on the Bonds" in Part B of this
    Prospectus.  For a discussion of the effect of an occurrence of nonpayment
    of principal or interest on any Bonds in the Trust, see "Portfolio
    Supervision" in Part B of this Prospectus.  No representation is made
    herein as to any Bond insurer's ability to meet its obligations under a
    policy of insurance relating to any of the Bonds.  In addition, investors
    should be aware that, subsequent to the Date of Deposit, the rating of the
    claims-paying ability of the insurer of an underlying Bond may be
    downgraded, which may result in a downgrading of the rating of the Units
    in the Trust.  The approximate percentage of the aggregate principal
    amount of the portfolio that is insured by each Insurance Company is as
    follows:  AMBAC Indemnity Corp. ("AMBAC"), 13.1%; Bond Investors Guaranty
    ("BIG"), 17.1%; Financial Guaranty Insurance Company ("Financial
    Guaranty"), 27.7%; and Municipal Bond Insurance Association ("MBIA"),
    42.1%. 

          PUBLIC OFFERING PRICE.  The secondary market Public Offering Price
    of each Unit is equal to the aggregate bid price of the Bonds in the Trust
    divided by the number of Units outstanding, plus a sales charge of 5.5% of
    the Public Offering Price, or 5.820% of the net amount invested in Bonds
    per Unit.  In addition, accrued interest to the expected date of
    settlement, including earned original issue discount, is added to the
    Public Offering Price.  If Units had been purchased on the Evaluation
    Date, the Public Offering Price per Unit would have been $555.44 plus
    accrued interest of $7.30 under the monthly distribution plan, $10.47
    under the semi-annual distribution plan and $30.66 under the annual
    distribution plan, for a total of $562.74, $565.91 and $586.10,
    respectively.  The Public Offering Price per Unit can vary on a daily
    basis in accordance with fluctuations in the aggregate bid price of the
    Bonds.  (See "Public Offering--Offering Price" in Part B of this
    Prospectus.)

          ESTIMATED LONG TERM RETURN AND ESTIMATED CURRENT RETURN.  Units of
    each Trust are offered to investors on a "dollar price" basis (using the
    computation method previously described under "Public Offering Price") as
    distinguished from a "yield price" basis often used in offerings of tax
    exempt bonds (involving the lesser of the yield as computed to maturity of
    bonds or to an earlier redemption date).  Since they are offered on a
    dollar price basis, the rate of return on an investment in Units of each
    Trust is measured in terms of "Estimated Current Return" and "Estimated
    Long Term Return".

          Estimated Long Term Return is calculated by:  (1) computing the
    yield to maturity or to an earlier call date (whichever results in a lower
    yield) for each Bond in the Trust's portfolio in accordance with accepted
    bond practices, which practices take into account not only the interest
    payable on the Bond but also the amortization of premiums or accretion of
    discounts, if any; (2) calculating the average of the yields for the Bonds
    in the Trust's portfolio by weighing each Bond's yield by the market value
    of the Bond and by the amount of time remaining to the date to which the
    Bond is priced (thus creating an average yield for the portfolio of the
    Trust); and (3) reducing the average yield for the portfolio of the Trust
    in order to reflect estimated fees and expenses of the Trust and the
    maximum sales charge paid by investors.  The resulting Estimated Long Term
    Return represents a measure of the return to investors earned over the
    estimated life of the Trust.  (For the Estimated Long Term Return to
    Certificateholders under the monthly, semi-annual and annual distribution
    plans, see "Summary of Essential Information".)

          Estimated Current Return is a measure of the Trust's cash flow. 
    Estimated Current Return is computed by dividing the Estimated Net Annual
    Interest Income per Unit by the Public Offering Price per Unit.  In
    contrast to the Estimated Long Term Return, the Estimated Current Return
    does not take into account the amortization of premium or accretion of
    discount, if any, on the Bonds in the portfolio of the Trust.  Moreover,
    because interest rates on Bonds purchased at a premium are generally
    higher than current interest rates on newly issued bonds of a similar type
    with comparable rating, the Estimated Current Return per Unit may be
    affected adversely if such Bonds are redeemed prior to their maturity.

          The Estimated Net Annual Interest Income per Unit of the Trust will
    vary with changes in the fees and expenses of the Trustee and the
    Evaluator applicable to the Trust and with the redemption, maturity, sale
    or other disposition of the Bonds in the Trust.  The Public Offering Price
    will vary with changes in the bid prices of the Bonds.  Therefore, there
    is no assurance that the present Estimated Current Return or Estimated
    Long Term Return will be realized in the future.  (For the Estimated
    Current Return to Certificateholders under the monthly, semi-annual and
    annual distribution plans, see "Summary of Essential Information".  See
    "Estimated Long Term Return and Estimated Current Return" in Part B of
    this Prospectus.)

          A schedule of cash flow projections is available from the Sponsor
    upon request.
        
          DISTRIBUTIONS.  Distributions of interest income, less expenses,
    will be made by the Trust either monthly, semi-annually or annually
    depending upon the plan of distribution applicable to the Unit purchased. 
    A purchaser of a Unit in the secondary market will initially receive
    distributions in accordance with the distribution plan chosen by the prior
    owner of such Unit and may thereafter change the plan as provided under
    "Interest and Principal Distributions" in Part B of this Prospectus. 
    Distributions of principal, if any, will be made semi-annually on June 15
    and December 15 of each year.  (See "Rights of Certificateholders--
    Interest and Principal Distributions" in Part B of this Prospectus.  For
    estimated monthly, semi-annual and annual interest distributions, see
    "Summary of Essential Information.")
       
          MARKET FOR UNITS.  The Sponsor, although not obligated to do so,
    intends to maintain a secondary market for the Units at prices based on
    the aggregate bid price of the Bonds in the Trust portfolio.  The reoffer
    price will be based on the aggregate bid price of the Bonds plus a sales
    charge of 5.5% of the Public Offering Price (5.820% of the net amount
    invested), plus net accrued interest.  If a market is not maintained a
    Certificateholder will be able to redeem his Units with the Trustee at a
    price also based on the aggregate bid price of the Bonds.  (See
    "Liquidity--Sponsor Repurchase" and "Public Offering--Offering Price" in
    Part B of this Prospectus.)
        
          TOTAL REINVESTMENT PLAN.  Certificateholders under the semi-annual
    and annual plans of distribution have the opportunity to have all their
    regular interest distributions, and principal distributions, if any,
    reinvested in available series of "Insured Municipal Securities Trust" or
    "Municipal Securities Trust."  (See "Total Reinvestment Plan" in Part B of
    this Prospectus.  Residents of Texas see "Total Reinvestment Plan for
    Texas Residents" in Part B of this Prospectus.)  The Plan is not designed
    to be a complete investment program. 

    <PAGE>
       
                        INSURED MUNICIPAL SECURITIES TRUST
                               25TH DISCOUNT SERIES

               SUMMARY OF ESSENTIAL INFORMATION AS OF JUNE 30, 1994

     Date of Deposit:  November 6, 1986         Weighted Average Life to 
     Principal Amount of Bonds ...$8,755,000     Maturity:  10.2 Years.
     Number of Units .............13,850        Minimum Value of Trust:
     Fractional Undivided Inter-                 Trust may be terminated if
       est in Trust per Unit .....1/13850        value of Trust is less than
     Principal Amount of                         $5,600,000 in principal
       Bonds per Unit ............$632.13        amount of Bonds.
     Secondary Market Public                    Mandatory Termination Date:
       Offering Price**                          The earlier of December 31,
       Aggregate Bid Price                       2035 or the disposition of
         of Bonds in Trust .......$7,269,773+++  the last Bond in the Trust.
       Divided by 13,850 Units ....$524.89      Trustee***:  United States
       Plus Sales Charge of 5.5%                 Trust Company of New York.
         of Public Offering Price $30.55        Trustee's Annual Fee:  Monthly 
       Public Offering Price                     plan $1.04 per $1,000; semi-
         per Unit ................$555.44+       annual plan $.56 per $1,000;
     Redemption and Sponsor's                    and annual plan is $.37 per
       Repurchase Price                          $1,000.
       per Unit ..................$524.89+      Evaluator:  Kenny S&P
                                         +++     Evaluation Services. 
                                         ++++   Evaluator's Fee for Each
     Excess of Secondary Market                  Evaluation:  Minimum of $12
       Public Offering Price                     plus $.25 per each issue of
       over Redemption and                       Bonds in excess of 50 issues
       Sponsor's Repurchase                      (treating separate maturities
       Price per Unit ............$30.55++++     as separate issues).
     Difference between Public                  Sponsor:  Bear, Stearns & Co.
       Offering Price per Unit                   Inc.
       and Principal Amount per                 Sponsor's Annual Fee:  Maximum
       Unit Premium/(Discount) ...$(76.69)       of $.15 per $1,000 principal
     Evaluation Time:  4:00 p.m.                 amount of Bonds (see "Trust
       New York Time.                            Expenses and Charges" in
     Minimum Principal Distribution:             Part B of this Prospectus).
       $1.00 per Unit.

        PER UNIT INFORMATION BASED UPON INTEREST DISTRIBUTION PLAN ELECTED

                                            Monthly   Semi-Annual   Annual
                                            Option      Option      Option

    Gross annual interest income# ......... $41.16      $41.16      $41.16
    Less estimated annual fees and
      expenses ............................   1.31         .85         .70
    Estimated net annual interest           ______      ______      ______
      income (cash)# ...................... $39.85      $40.31      $40.46
    Estimated interest distribution# ......   3.32       20.15       40.46
    Estimated daily interest accrual# .....  .1106       .1119       .1123
    Estimated current return#++ ...........  7.17%       7.26%       7.28%
    Estimated long term return++ ..........  4.66%       4.74%       4.77%
    Record dates .......................... 1st of      Dec. 1 and   Dec. 1
                                            each month  June 1
    Interest distribution dates ........... 15th of     Dec. 15 and  Dec. 15
                                            each month  June 15
        
    <PAGE>
       *  The Date of Deposit is the date on which the Trust Agreement was
          signed and the deposit of the Bonds with the Trustee made.

      **  For information regarding offering price per Unit and applicable
          sales charge under the Total Reinvestment Plan, see "Total
          Reinvestment Plan" in Part B of this Prospectus. 

     ***  The Trustee maintains its corporate trust office at 770 Broadway,
          New York, New York 10003 (tel. no. 1-800-428-8890).  For information
          regarding redemption by the trustee, see "Trustee Redemption" in
          Part B of this Prospectus.
       
       +  Plus accrued interest to the expected date of settlement
          (approximately five business days after purchase) of $7.30 monthly,
          $10.47 semi-annually and $30.66 annually. 
        
      ++  The estimated current return and estimated long term return are
          increased for transactions entitled to a discount (see "Employee
          Discounts" in Part B of this Prospectus), and are higher under the
          semi-annual and annual options due to lower Trustee's fees and
          expenses.

     +++  Based solely upon the bid side evaluation of the underlying Bonds
          (including, where applicable, undistributed cash from the principal
          account).  Upon tender for redemption, the price to be paid will be
          calculated as described under "Trustee Redemption" in Part B of this
          Prospectus. 

    ++++  See "Comparison of Public Offering Price, Sponsor's Repurchase Price
          and Redemption Price" in Part B of this Prospectus. 

       #  Does not include income accrual from original issue discount bonds,
          if any.

    <PAGE>
       
                          INFORMATION REGARDING THE TRUST
                                AS OF JUNE 30, 1994


    DESCRIPTION OF PORTFOLIO

          The portfolio of the Trust consists of 24 issues representing
    obligations of issuers located in 13 states and the District of Columbia. 
    The Sponsor has not participated as a sole underwriter or manager, co-
    manager or member of an underwriting syndicate from which any of the
    initial aggregate principal amount of the Bonds were acquired. 
    Approximately 24.3% of the Bonds are obligations of state and local
    housing authorities; approximately 20.6% are hospital revenue bonds; none
    were issued in connection with the financing of nuclear generating
    facilities; and none are "mortgage subsidy" bonds.  All of the Bonds in
    the Trust are subject to redemption prior to their stated maturity dates
    pursuant to sinking fund or call provisions.  The Bonds may also be
    subject to other calls, which may be permitted or required by events which
    cannot be predicted (such as destruction, condemnation, termination of a
    contract, or receipt of excess or unanticipated revenues).  Two of the
    issues representing $1,090,000 of the principal amount of the Bonds are
    general obligation bonds.  All 22 of the remaining issues representing
    $7,665,000 of the principal amount of the Bonds are payable from the
    income of a specific project or authority and are not supported by the
    issuer's power to levy taxes.  The portfolio is divided for purpose of
    issue as follows:  Coal Power 3, Convention Center 2, Electric 1, Electric
    and Gas 1, Fair and Exposition 1, Hospital 8, Insured Multi-Family
    Housing 1, Pollution Control 1, Sales Tax 1, Sewer 1, and Water and
    Sewer 2.  For an explanation of the significance of these factors see "The
    Trust--Portfolio" in Part B of this Prospectus. 

          As of June 30, 1994, $2,135,000 (approximately 24.3% of the
    aggregate principal amount of the Bonds) were original issue discount
    bonds.  Of these original issue discount bonds, $2,135,000 (approximately
    24.3% of the aggregate principal amount of the Bonds) were Zero Coupon
    Bonds.  Zero Coupon Bonds do not provide for the payment of any current
    interest and provide for payment at maturity at par value unless sooner
    sold or redeemed.  The market value of Zero Coupon Bonds is subject to
    greater fluctuations than coupon bonds in response to changes in interest
    rates.  None of the aggregate principal amount of the Bonds in the Trust
    were purchased at a "market" discount from par value at maturity,
    approximately 75.7% were purchased at a premium and none were purchased at
    par.  For an explanation of the significance of these factors see
    "Discount and Zero Coupon Bonds" in Part B of this Prospectus. 
        
          None of the Bonds in the Trust are subject to the federal individual
    alternative minimum tax under the Tax Reform Act of 1986.  See "Tax
    Status" in Part B of this Prospectus. 


    <PAGE>
                       FINANCIAL AND STATISTICAL INFORMATION


    Selected data for each Unit outstanding for the periods listed below:

                                                                    Distribu-
                                                                    tions of
                                          Distributions of Interest Principal
                                         During the Period (per Unit) During
                             Net Asset*            Semi-              the
                  Units Out-   Value     Monthly   Annual   Annual   Period
    Period Ended   standing   Per Unit   Option    Option   Option  (Per Unit)

       
    June 30, 1992   13,917     $561.44   $41.79    $42.29   $43.80   $36.04
    June 30, 1993   13,917      567.32    39.84     40.38    40.80      -0-
    June 30, 1994   13,850      536.38    39.82     40.33    40.53     2.99

    *     Net Asset Value per Unit is calculated by dividing net assets as
          disclosed in the "Statement of Net Assets" by the number of Units
          outstanding as of the date of the Statement of Net Assets.  See
          Note 5 of Notes to Financial Statements for a description of the
          components of Net Assets.
        
<PAGE>

Independent Auditors' Report


The Sponsor, Trustee and Certificateholders
Insured Municipal Securities Trust, 25th Discount Series:


We have audited the accompanying statement of net assets, including the 
portfolio, of Insured Municipal Securities Trust, 25th Discount Series as of 
June 30, 1994, and the related statements of operations, and changes in net 
assets for each of the years in the three year period then ended.  These 
financial statements are the responsibility of the Trustee (see note 2).  Our 
responsibility is to express an opinion on these financial statements 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 financial statements are free of 
material misstatement.  An audit includes examining, on a test basis, evidence 
supporting the amounts and disclosures in the financial statements.  Our 
procedures included confirmation of securities owned as of June 30, 1994, by 
correspondence with the Trustee.  An audit also includes assessing the 
accounting principles used and significant estimates made by management, as 
well as evaluating the overall financial statement presentation.  We believe 
that our audits provide a reasonable basis for our opinion.

In our opinion, the financial statements referred to above present fairly, in 
all material respects, the financial position of Insured Municipal Securities 
Trust, 25th Discount Series as of June 30, 1994, and the results of its 
operations and the changes in its net assets for each of the years in the 
three year period then ended, in conformity with generally accepted accounting 
principles.

    KPMG Peat Marwick LLP

New York, New York
September 15, 1994
<PAGE>
<TABLE> 
                INSURED MUNICIPAL SECURITIES TRUST, 25TH DISCOUNT SERIES              
                                                                                     
                                Statement of Net Assets                              
                                                                                     
                                     June 30, 1994                                   
<S>                                                                    <C>                         
       Investments in marketable securities,                                         
          at market value (cost    $7,493,901)                         $  7,269,648  
                                                                                     
       Excess of other assets over total liabilities                        159,176  
                                                                         ----------- 
                                                                                     
       Net assets ( 13,850 units  of fractional undivided                            
          interest outstanding,   $536.38 per  unit)                   $  7,428,824  
                                                                         =========== 
                                                                                     
       See accompanying notes to financial statements.                               
</TABLE> 
<PAGE>
<TABLE> 
                INSURED MUNICIPAL SECURITIES TRUST, 25TH DISCOUNT SERIES                            
                                                                                                    
                              Statements of Operations                                              
<CAPTION>                                                                                                    
                                                                Years ended June 30,                
                                                 ------------  ---- ------------  ---- ------------ 
                                                     1994               1993               1992     
                                                 ------------       ------------       ------------ 
<S>                                           <C>                   <C>                <C>
     Investment income - interest             $      584,319            586,792            621,033  
                                                 ------------       ------------       ------------ 
                                                                                                    
     Expenses:                                                                                      
        Trustee's fees                                10,158             11,026             11,102  
        Evaluator's fees                               3,584              3,412              3,024  
        Sponsor's fees                                 1,434              1,434              1,515  
                                                 ------------       ------------       ------------ 
                                                                                                    
                   Total expenses                     15,176             15,872             15,641  
                                                 ------------       ------------       ------------ 
                                                                                                    
                   Investment income, net            569,143            570,920            605,392  
                                                 ------------       ------------       ------------ 
                                                                                                    
     Realized and unrealized gain (loss)                                                            
        on investments:                                                                             
          Net realized loss on bonds                                                                
            sold or called                           (21,344)            -                 (48,514) 
          Unrealized appreciation                                                                   
            (depreciation) for the year             (380,023)            68,548            240,489  
                                                 ------------       ------------       ------------ 
                                                                                                    
                Net gain (loss) on                                                                  
                  investments                       (401,367)            68,548            191,975  
                                                 ------------       ------------       ------------ 
                                                                                                    
                Net increase in net                                                                 
                  assets resulting                                                                  
                  from operations             $      167,776            639,468            797,367  
                                                 ============       ============       ============ 
                                                                                                    
     See accompanying notes to financial statements. 
</TABLE> 
<PAGE>
<TABLE> 
               INSURED MUNICIPAL SECURITIES TRUST, 25TH DISCOUNT SERIES                   
                                                                                          
                            Statements of Changes in Net Assets                           
<CAPTION>                                                                                          
                                                           Years ended June 30,           
                                                 ----------- -- ----------- -- -----------
                                                    1994           1993           1992    
                                                 -----------    -----------    -----------
<S>                                            <C>              <C>            <C> 
      Operations:                                                                         
         Investment income, net                $    569,143        570,920        605,392 
         Net realized loss on bonds                                                       
       $    sold or called                          (21,344)         -            (48,514)
         Unrealized appreciation                                                          
           (depreciation) for the year             (380,023)        68,548        240,489 
                                                 -----------    -----------    -----------
                                                                                          
                       Net increase in net                                                
                         assets resulting                                                 
                         from operations            167,776        639,468        797,367 
                                                 -----------    -----------    -----------
                                                                                          
      Distributions:                                                                      
         To Certificateholders:                                                           
           Investment income                        555,930        557,652        588,715 
           Principal                                 41,541          -            501,569 
                                                                                          
      Redemptions:                                                                        
         Interest                                       598          -                974 
         Principal                                   36,304          -             49,144 
                                                 -----------    -----------    -----------
                                                                                          
                     Total distributions and                                              
                       redemptions                  634,373        557,652      1,140,402 
                                                 -----------    -----------    -----------
                                                                                          
                     Total increase (decrease)     (466,597)        81,816       (343,035)
                                                                                          
      Net assets at beginning of year             7,895,421      7,813,605      8,156,640 
                                                 -----------    -----------    -----------
                                                                                          
      Net assets at end of year (including                                                
         undistributed net investment                                                     
         income of   $214,200,   $222,402 and                                             
         $209,134, respectively)               $  7,428,824      7,895,421      7,813,605 
                                                 ===========    ===========    ===========
                                                                                          
      See accompanying notes to financial statements.                                     
</TABLE> 
<PAGE>
INSURED MUNICIPAL SECURITIES TRUST, 25TH DISCOUNT SERIES     

Notes to Financial Statements

June 30, 1994, 1993 and 1992

(1)    Organization and Financial and Statistical Information

Insured Municipal Securities Trust, 25th Discount Series (Trust) was 
organized on November 6, 1986 by Bear, Stearns & Co. Inc. (Sponsor) 
under the laws of the State of New York by a Trust Indenture and 
Agreement, and is registered under the Investment Company Act 
of 1940.

(2)    Summary of Significant Accounting Policies

United States Trust Company of New York (Trustee) has custody of and 
responsibility for the accounting records and financial statements of 
the Trust and is responsible for establishing and maintaining a 
system of internal control related thereto.

The Trustee is also responsible for all estimates of expenses and 
accruals reflected in the Trust's financial statements.  The 
accompanying financial statements have been adjusted to record the 
unrealized appreciation (depreciation) of investments and to record 
interest income and expenses on the accrual basis.

The discount on the zero-coupon bonds is accreted by the interest 
method over the respective lives of the bonds.  The accretion of such 
discount is included in interest income; however, it is not 
distributed until realized in cash upon maturity or sale of the 
respective bonds.

Investments are carried at market value which is determined by either 
Standard & Poor's Corporation or Moody's Investors Service, Inc. 
(Evaluator) as discussed in the footnotes to the portfolio.  The 
market value of the investments is based upon the bid prices for the 
bonds at the end of the year, except that the market value on the 
date of deposit represents the cost to the Trust based on the 
offering prices for investments at that date.  The difference between 
cost (including accumulated accretion of original issue discount on 
zero-coupon bonds) and market value is reflected as unrealized 
appreciation (depreciation) of investments.  Securities transactions 
are recorded on the trade date.  Realized gains (losses) from 
securities transactions are determined on the basis of average cost 
of the securities sold or redeemed.

(3)    Income Taxes

The Trust is not subject to Federal income taxes as provided for by 
the Internal Revenue Code.  

(4)    Trust Administration

The fees and expenses of the Trust are incurred and paid on the basis 
set forth under "Trust Expenses and Charges" in Part B of this 
Prospectus.

The Trust Indenture and Agreement provides for interest distributions 
as often as monthly (depending upon the distribution plan elected by 
the Certificateholders).  

The Trust Indenture and Agreement further requires that principal 
received from the disposition of bonds, other than those bonds sold 
in connection with the redemption of units, be distributed to 
Certificateholders.

See "Financial and Statistical Information" in Part A of this 
Prospectus for the amounts of per unit distributions during the years 
ended June 30, 1994, 1993 and 1992.

The Trust Indenture and Agreement also requires the Trust to redeem 
units tendered.  67 units and 83 units were redeemed by the Trust 
during the years ended June 30, 1994 and 1992, respectively.  No 
units were redeemed during the year ended June 30, 1993. 

(5)    Net Assets

At June 30, 1994, the net assets of the Trust represented the 
interest of Certificateholders as follows:

        Original cost to Certificateholders                   $ 8,705,412
        Less initial gross underwriting commission               (478,800)

                                                                8,226,612

        Cost of securities sold or called                        (787,861)
        Net unrealized depreciation                              (224,253)
        Undistributed net investment income                       214,200
        Undistributed proceeds from bonds sold or called              126
            
            Total                                             $ 7,428,824


The original cost to Certificateholders, less the initial gross     
underwriting commission, represents the aggregate initial public 
offering price net of the applicable sales charge on 14,000 units of 
fractional undivided interest of the Trust as of the date of deposit.

Undistributed net investment income includes accumulated accretion of 
original issue discount of $55,150.
<PAGE>
<TABLE> 
INSURED MUNICIPAL SECURITIES TRUST, 25TH DISCOUNT SERIES                                                 
Portfolio 
June 30, 1994
<CAPTION>    
Port-     Aggregate                                     Coupon Rate/   Redemption Feature                
folio    Principal       Name of Issuer       Ratings   Date(s) of     S.F.--Sinking Fund       Market   
No.        Amount      and Title of Bonds       (1)     Maturity(2)    Ref.--Refunding(2)(7)    Value(3) 
- ----    -----------   ---------------------   -------   ------------   ---------------------    ---------
<S>  <C>              <C>                       <C>     <C>            <C>                   <C> 
  1  $      650,000   Municipality of           AAA     8.125%         6/01/02 @ 100 S.F.    $    703,885
                      Anchorage, Alaska                 6/01/2011      6/01/96 @ 102 Ref.                
                      1986 General                                                                       
                      Obligation Water                                                                   
                      Bonds (Financial                                                                   
                      Guaranty) (5)                                                                      
                                                                                                         
  2         300,000   Municipality of           AAA     7.625          12/01/07 @ 100 S.F.        322,374
                      Anchorage, Alaska                 12/01/2015     6/01/96 @ 102 Ref.                
                      Senior Lien refunding                                                              
                      Electric Revenue                                                                   
                      Bonds, 1986 Series A                                                               
                      (MBIA) (5)                                                                         
                                                                                                         
  3         440,000   Kenai Peninsula           AAA     8.400          No Sinking Fund            504,368
                      Borough, Alaska                   1/01/2000      None                              
                      General Obligation                                                                 
                      Bonds, 1986 Series                                                                 
                      (AMBAC)                                                                            
                                                                                                         
  4         120,000   Little Rock, Arkansas     AAA     7.750          1/01/06 @ 100 S.F.         128,917
                      Hotel and Restaurant              1/01/2015      1/01/96 @ 103 Ref.                
                      Gross Receipt Tax                                                                  
                      Little Rock Arkansas                                                               
                      Convention Center                                                                  
                      Refunding Revenue                                                                  
                      Bonds (Financial                                                                   
                      Guaranty) (5)                                                                      
                                                                                                         
  5          25,000   Jacksonville, Florida     AAA     9.100          12/01/01 @ 100 S.F.         28,394
                      Health Facilities                 12/01/2015     12/01/97 @ 100 Ref.               
                      Authority, Health                                                                  
                      Facility Revenue                                                                   
                      Refunding Bonds (St.                                                               
                      Vincent DePaul Health                                                              
                      System) (AMBAC) (5)                                                                
                                                                                                         
  6          60,000   Manatee County,           AAA     9.750          9/01/05 @ 100 S.F.          65,020
                      Florida Industrial                9/01/2010      9/01/95 @ 102 Ref.                
                      Development Revenue                                                                
                      Bonds, 1985 Series                                                                 
                      (Manatee Hospitals                                                                 
                      and Health Systems,                                                                
                      Inc.) (MBIA)                                                                       
                                                                                                         
  7          25,000   Orange County,            AAA     9.000          10/01/01 @ 100 S.F.         25,851
                      Florida Tourist                   10/01/2006     10/01/94 @ 102 Ref.               
                      Development Tax                                                                    
                      Revenue Bonds Orange                                                               
                      County Convention                                                                  
                      Center Issue (AMBAC)                                                               
                      (5)                                                                                
                                                                                                         
  8         500,000   Tamarac, Florida          AAA     8.250          No Sinking Fund            548,165
                      Water and Sewerage                10/01/2011     10/01/96 @ 102 Ref.               
                      Revenue Bonds 1986                                                                 
                      Series (AMBAC) (5)                                                                 
                                                                                                         
  9         160,000   Municipal Electric        AAA     9.000          1/01/18 @ 100 S.F.         167,160
                      Authority of Georgia              1/01/2020      1/01/95 @ 102 Ref.                
                      Power Revenue Bonds                                                                
                      Series 1985 K (AMBAC)                                                              
                                                                                                         
 10         115,000   Metropolitan Fair and     AAA     8.750          6/01/01 @ 100 S.F.         121,661
                      Exposition Authority              6/01/2005      6/01/95 @ 102 Ref.                
                      (Illinois) Dedicated                                                               
                      State Tax Revenue                                                                  
                      Bonds Series 1985                                                                  
                      (BIG) (5)                                                                          
                                                                                                         
 11   $     450,000   The Hospital              AAA     9.125%         7/01/01 @ 100 S.F.     $   479,250
                      Authority of the City             7/01/2015      7/01/95 @ 102 Ref.                
                      of Fort Wayne,                                                                     
                      Indiana Hospital                                                                   
                      Revenue Refunding                                                                  
                      Bonds (Ancilla                                                                     
                      Systems                                                                            
                      (Incorporated) Series                                                              
                      1985A (BIG) (5)                                                                    
                                                                                                         
 12         200,000   City of Rockport,         AAA     9.250          No Sinking Fund            214,824
                      Indiana Pollution                 8/01/2014      8/01/95 @ 102 Ref.                
                      Control Revenue Bonds                                                              
                      (Indiana and Michigan                                                              
                      Electric Company                                                                   
                      Project) Series 1985A                                                              
                      (BIG)                                                                              
                                                                                                         
 13         400,000   Jefferson Parish,         AAA     7.875          No Sinking Fund            432,496
                      Louisiana Hospital                7/01/2006      7/01/96 @ 102 Ref.                
                      Service District #2                                                                
                      Hospital Revenue                                                                   
                      Refunding Bonds                                                                    
                      (MBIA) (5)                                                                         
                                                                                                         
 14         600,000   Jefferson Sales Tax       AAA     8.000          Currently  @ 100 S.F.      677,670
                      District, Jefferson               7/01/2005      7/01/99 @ 100 Ref.                
                      Parish, Louisiana                                                                  
                      Special Sales Tax                                                                  
                      Revenue Bonds, Series                                                              
                      1986 A (BIG) (5)                                                                   
                                                                                                         
 15          60,000   Michigan State            AAA     9.250          7/01/05 @ 100 S.F.          63,973
                      Hospital Finance                  7/01/2015      7/01/95 @ 102 Ref.                
                      Authority Revenue                                                                  
                      Bonds (Sisters of                                                                  
                      Mercy Health                                                                       
                      Corporation) Series                                                                
                      1985 F (MBIA) (5)                                                                  
                                                                                                         
 16         300,000   City of Farmington,       AAA     9.750          5/15/06 @ 100 S.F.         333,045
                      New Mexico Utility                5/15/2013      5/15/96 @ 102 Ref.                
                      System Revenue Bonds                                                               
                      Series 1985                                                                        
                      (Financial Guaranty)                                                               
                      (5)                                                                                
                                                                                                         
 17          25,000   Berks County,             AAA     9.500          6/15/01 @ 100 S.F.          26,771
                      Pennsylvania                      6/15/2004      6/15/95 @ 102 Ref.                
                      Municipal Authority                                                                
                      Hospital Revenue                                                                   
                      Bonds (Franciscan                                                                  
                      Health System/Saint                                                                
                      Joseph Hospital,                                                                   
                      Reading,                                                                           
                      Pennsylvania) Series                                                               
                      of 1985 (BIG)                                                                      
                                                                                                         
 18          25,000   Mount Lebanon,            AAA     9.125          1/01/96 @ 100 S.F.          27,209
                      Pennsylvania Hospital             7/01/2006      1/01/96 @ 102 Ref.                
                      Authority Hospital                                                                 
                      Revenue Refunding                                                                  
                      Series 1985 (St.                                                                   
                      Clair Memorial                                                                     
                      Hospital) (Financial                                                               
                      Guaranty) (5)                                                                      
                                                                                                         
 19         100,000   City of San Antonio,      AAA     9.375          2/01/05 @ 100 S.F.         104,302
                      Texas Electric and                2/01/2009      2/01/95 @ 101.5 Ref.              
                      Gas System                                                                         
                      Improvement Bonds New                                                              
                      Series 1985A (BIG)                                                                 
                      (5)                                                                                
                                                                                                         
 20         700,000   Tarrant County            AAA     9.750          9/01/03 @ 100 S.F.         755,034
                      (Texas) Health                    9/01/2015      9/01/95 @ 102 Ref.                
                      Facilities                                                                         
                      Development                                                                        
                      Corporation Health                                                                 
                      System Revenue Bonds                                                               
                      Harris Methodist                                                                   
                      Health System Series                                                               
                      1985 (Financial                                                                    
                      Guaranty) (5)                                                                      
                                                                                                         
 21   $      65,000   Tarrant County            AAA     9.500%         No Sinking Fund       $     69,927
                      (Texas) Health                    9/01/2002      9/01/95 @ 102 Ref.                
                      Facilities                                                                         
                      Development                                                                        
                      Corporation Health                                                                 
                      System Revenue Bonds                                                               
                      Harris Methodist                                                                   
                      Health System Series                                                               
                      1985 (Financial                                                                    
                      Guaranty) (5)                                                                      
                                                                                                         
 22         735,000   Intermountain Power       AAA     8.750          7/01/06 @ 100 S.F.         780,100
                      Agency (a political               7/01/2012      7/01/95 @ 102 Ref.                
                      subdivision of the                                                                 
                      State of Utah) Power                                                               
                      Supply System Revenue                                                              
                      Refunding Bonds 1985                                                               
                      Series J (MBIA) (5)                                                                
                                                                                                         
 23         565,000   Mount Vernon,             AAA     8.050          7/01/02 @ 100 S.F.         602,443
                      Washington Sewer                  7/01/2006      7/01/96 @ 100 Ref.                
                      Revenue Authority                                                                  
                      Bonds, 1986 Series                                                                 
                      (Financial Guaranty)                                                               
                      (5)                                                                                
                                                                                                         
 24       2,135,000   The District of           AAA     0.000          5/01/05 @ 11.975 S.F.       86,809
                      Columbia Multi-Unit               11/01/2025     11/01/98 @ 6.415 Ref.             
                      Housing Finance                                                                    
                      Corporation Mortage                                                                
                      Revenue Bonds, Series                                                              
                      1983 (FHA Insured                                                                  
                      Mortgage Loan --                                                                   
                      Congress Park II                                                                   
                      apartments Section 8                                                               
                      Assisted Project)                                                                  
                      (MBIA)                                                                             
        -----------                                                                             ---------
                                                                                                         
      $   8,755,000                                                                          $  7,269,648
        ===========                                                                             =========
                                                                                                         
  See accompanying footnotes to portfolio and notes to the financial statements                          
</TABLE> 
<PAGE>
INSURED MUNICIPAL SECURITIES TRUST, 25TH DISCOUNT SERIES

Footnotes to Portfolio

June 30, 1994




(1)    All ratings are by Standard & Poor's Corporation.  A brief description 
of the ratings symbols and their meanings is set forth under 
"Description of Bond Ratings" in Part B of this Prospectus.

(2)    See "The Trust - Portfolio" in Part B of this Prospectus for an 
explanation of redemption features.  See "Tax Status" in Part B of 
this Prospectus for a statement of the Federal tax consequences to a 
Certificateholder upon the sale, redemption or maturity of a bond.

(3)    At June 30, 1994, the net unrealized depreciation of all the bonds was 
comprised of the following:

    Gross unrealized appreciation                     $   59,499       
    Gross unrealized depreciation                       (283,752)
    

    Net unrealized depreciation                       $ (224,253)     

(4)    The annual interest income, based upon bonds held at June 30, 1994, 
(excluding accretion of original issue discount on zero-coupon bonds) 
to the Trust is $ 570,149.

(5)    The bonds have been prerefunded and will be redeemed at the next 
refunding call date.

(6)    Bonds sold or called after June 30, 1994 are noted in a footnote 
    "Changes in Trust Portfolio" under "Description of Portfolio" in Part A 
    of this Prospectus.

(7)    The Bonds may also be subject to other calls, which may be permitted or 
required by events which cannot be predicted (such as destruction, 
condemnation, termination of a contract, or receipt of excess or 
unanticipated revenues).

<PAGE>


                 NOTE:  Part A of This Prospectus May Not Be     
                        Distributed Unless Accompanied by Part B.


                        INSURED MUNICIPAL SECURITIES TRUST

                               26TH DISCOUNT SERIES
                              (MULTIPLIER PORTFOLIO)


                                                                              
       
          The Trust is a unit investment trust designated 26th Discount Series
    ("Insured Municipal Discount Trust") with an underlying portfolio of long-
    term insured tax-exempt bonds issued by or on behalf of states,
    municipalities and public authorities and was formed to preserve capital
    and to provide interest income (including, where applicable, earned
    original issue discount) which, in the opinions of bond counsel to the
    respective issuers, is, with certain exceptions, currently exempt from
    regular federal income tax under existing law but may be subject to state
    and local taxes.  Capital gains are subject to tax.  (See "Tax Status" and
    "The Trust--Portfolio" in Part B of this Prospectus.)  The Sponsor is
    Bear, Stearns & Co. Inc.  The value of the Units of the Trust will
    fluctuate with the value of the underlying bonds.  Minimum purchase:  1
    Unit. 

                                                                              


          This Prospectus consists of two parts.  Part A contains the Summary
    of Essential Information as of June 30, 1994 (the "Evaluation Date"), a
    summary of certain specific information regarding the Trust and audited
    financial statements of the Trust, including the related portfolio, as of
    the Evaluation Date.  Part B of this Prospectus contains a general summary
    of the Trust. 
        
                    Investors should retain both parts of this
                         Prospectus for future reference. 

                                                                              


     THESE SECURITIES HAVE NOT BEEN APPROVED OR DISAPPROVED BY THE SECURITIES
     AND EXCHANGE COMMISSION OR ANY STATE SECURITIES COMMISSION NOR HAS THE
     COMMISSION OR ANY STATE SECURITIES COMMISSION PASSED UPON THE ACCURACY OR
     ADEQUACY OF THIS PROSPECTUS.  ANY REPRESENTATION TO THE CONTRARY IS A
     CRIMINAL OFFENSE.
       
                     Prospectus Part A Dated October 28, 1994
        
    <PAGE>
       
          THE TRUST.  The Trust is a unit investment trust formed to preserve
    capital and to provide interest income (including, where applicable,
    earned original issue discount) which, in the opinions of bond counsel to
    the respective issuers, is, with certain exceptions, currently exempt from
    regular federal income tax under existing law through investment in a
    fixed, diversified portfolio of long-term insured bonds (the "Bonds")
    issued by or on behalf of states, municipalities and public authorities
    which, because of irrevocable insurance, are rated "AAA" by Standard &
    Poor's Corporation.  Although the Supreme Court has determined that
    Congress has the authority to subject interest on bonds such as the Bonds
    in the Trust to regular federal income taxation, existing law excludes
    such interest from regular federal income tax.  Such interest income may,
    however, be subject to the federal corporate alternative minimum tax and
    to state and local taxes.  (See "Tax Status" in Part B of this
    Prospectus.)  For a list of ratings on the Evaluation Date, see
    "Portfolio."  The Bonds were acquired at prices which resulted in the
    portfolio as a whole being purchased at a deep discount from par value. 
    The portfolio may also include bonds issued at an original issue discount. 
    Additionally, some of the Bonds in the portfolio may be "Zero Coupon
    Bonds," which are original issue discount bonds that provide for payment
    at maturity at par value, but do not provide for the payment of any
    current interest.  Some of the Bonds in the Trust have been issued with
    optional refunding or refinancing provisions ("Refunded Bonds") whereby
    the issuer of the Bond has the right to call such Bond prior to its stated
    maturity date (and other than pursuant to sinking fund provisions) and to
    issue new bonds ("Refunding Bonds") in order to finance the redemption. 
    Issuers typically utilize refunding calls in order to take advantage of
    lower interest rates in the marketplace.  Some of these Refunded Bonds may
    be called for redemption pursuant to pre-refunding provisions ("Pre-
    Refunded Bonds") whereby the proceeds from the issue of the Refunding
    Bonds are typically invested in government securities in escrow for the
    benefit of the holders of the Pre-Refunded Bonds until the refunding call
    date.  Usually, Pre-Refunded Bonds will bear a triple-A rating because of
    this escrow.  The issuers of Pre-Refunded Bonds must call such Bonds on
    their refunding call date.  Therefore, as of such date, the Trust will
    receive the call price for such bonds but will cease receiving interest
    income with respect to them.  For a list of those Bonds which are Pre-
    Refunded Bonds, if any, as of the Evaluation Date, see "Notes to Financial
    Statements" in this Part A.  Some of the Bonds in the portfolio may have
    been purchased at an aggregate premium over par.  All of the Bonds in the
    Trust were rated "AAA" by Standard & Poor's Corporation at the time
    originally deposited in the Trust.  This rating results from insurance
    relating only to the Bonds in the Trust and not to the Units of the Trust. 
    The insurance does not remove market risk, as it does not guarantee the
    market value of the Units.  For a discussion of the significance of such
    ratings, see "Description of Bond Ratings" in Part B of this Prospectus,
    and for a list of ratings on the Evaluation Date see the "Portfolio."  The
    payment of interest and preservation of capital are, of course, dependent
    upon the continuing ability of issuers of the Bonds or the insurers
    thereof to meet their obligations.  There can be no assurance that the
    Trust's investment objectives will be achieved.  Investment in the Trust
    should be made with an understanding of the risks which an investment in
    long-term fixed rate debt obligations may entail, including the risk that
    the value of the underlying portfolio will decline with increases in
    interest rates, and that the value of Zero Coupon Bonds is subject to
    greater fluctuation than coupon bonds in response to changes in interest
    rates.  Each Unit in the Trust represents a 1/11886th undivided interest
    in the principal and net income of the Trust.  The principal amount of
    Bonds deposited in the Trust per Unit is reflected in the Summary of
    Essential Information.  (See "Organization" in Part B of this Prospectus.) 
    The Units being offered hereby are issued and outstanding Units which have
    been purchased by the Sponsor in the secondary market. 

          INSURANCE.  Each of the Bonds in the Trust is insured by a municipal
    bond guaranty insurance policy obtained by either the Sponsor ("Sponsor-
    Insured Bonds") or the issuers of the Bonds ("Pre-Insured Bonds") and
    issued by one of the insurance companies (the "Insurance Companies"),
    described under "Insurance on the Bonds" in Part B of this Prospectus,
    covering scheduled payment of principal thereof and interest thereon when
    such amounts shall become due for payment but shall not have been paid by
    the issuer or any other insurer thereof.  The insurance, unless obtained
    by Municipal Bond Investors Assurance Corporation ("MBIA Corp."), will
    also cover any accelerated payments of principal and the increase in
    interest payments or premiums, if any, payable upon mandatory redemption
    of the Bonds if interest on any Bonds is ultimately deemed to be subject
    to regular federal income tax.  Insurance obtained from MBIA Corp. only
    guarantees the accelerated payments required to be made by or on behalf of
    an issuer of small industrial revenue bonds and pollution control bonds if
    there is an event which results in the loss of tax-exempt status of the
    interest on such Bonds, including principal, interest or premium payments,
    if any, as and when required.  To the extent, therefore, that Bonds are
    only covered by insurance obtained from MBIA Corp., such Bonds will not be
    covered for the accelerated payments required to be made by or on behalf
    of an issuer of other than small industrial revenue bonds or pollution
    control revenue bonds if there occurs an event which results in the loss
    of tax-exempt status of the interest on such Bonds.  None of the insurance
    will cover accelerated payments of principal or penalty interest or
    premiums unrelated to taxability of interest on the Bonds (although the
    insurance, including insurance obtained by MBIA Corp., does guarantee
    payment of principal and interest in such amounts and at such times as
    such amounts would have been due absent such acceleration).  The insurance
    relates only to the prompt payment of principal of and interest on the
    securities in the portfolio, and does not remove market risks or guarantee
    the market value of the Units in the Trust.  The terms of the insurance
    are more fully described under "Insurance on the Bonds" in Part B of this
    Prospectus.  For a discussion of the effect of an occurrence of nonpayment
    of principal or interest on any Bonds in the Trust, see "Portfolio
    Supervision" in Part B of this Prospectus.  No representation is made
    herein as to any Bond insurer's ability to meet its obligations under a
    policy of insurance relating to any of the Bonds.  In addition, investors
    should be aware that, subsequent to the Date of Deposit, the rating of the
    claims-paying ability of the insurer of an underlying Bond may be
    downgraded, which may result in a downgrading of the rating of the Units
    in the Trust.  The approximate percentage of the aggregate principal
    amount of the portfolio that is insured by each Insurance Company is as
    follows:  AMBAC Indemnity Corp. ("AMBAC"), 8.4%; Bond Investors Guaranty
    ("BIG"), 14.1%; Financial Guaranty Insurance Company ("Financial
    Guaranty"), 5%; and Municipal Bond Insurance Association ("MBIA"), 72.5%. 

          PUBLIC OFFERING PRICE.  The secondary market Public Offering Price
    of each Unit is equal to the aggregate bid price of the Bonds in the Trust
    divided by the number of Units outstanding, plus a sales charge of 5.5% of
    the Public Offering Price, or 5.820% of the net amount invested in Bonds
    per Unit.  In addition, accrued interest to the expected date of
    settlement, including earned original issue discount, is added to the
    Public Offering Price.  If Units had been purchased on the Evaluation
    Date, the Public Offering Price per Unit would have been $558.42 plus
    accrued interest of $7.53 under the monthly distribution plan, $10.65
    under the semi-annual distribution plan and $31.73 under the annual
    distribution plan, for a total of $565.95, $569.07 and $590.15,
    respectively.  The Public Offering Price per Unit can vary on a daily
    basis in accordance with fluctuations in the aggregate bid price of the
    Bonds.  (See "Public Offering--Offering Price" in Part B of this
    Prospectus.)

          ESTIMATED LONG TERM RETURN AND ESTIMATED CURRENT RETURN.  Units of
    each Trust are offered to investors on a "dollar price" basis (using the
    computation method previously described under "Public Offering Price") as
    distinguished from a "yield price" basis often used in offerings of tax
    exempt bonds (involving the lesser of the yield as computed to maturity of
    bonds or to an earlier redemption date).  Since they are offered on a
    dollar price basis, the rate of return on an investment in Units of each
    Trust is measured in terms of "Estimated Current Return" and "Estimated
    Long Term Return".

          Estimated Long Term Return is calculated by:  (1) computing the
    yield to maturity or to an earlier call date (whichever results in a lower
    yield) for each Bond in the Trust's portfolio in accordance with accepted
    bond practices, which practices take into account not only the interest
    payable on the Bond but also the amortization of premiums or accretion of
    discounts, if any; (2) calculating the average of the yields for the Bonds
    in the Trust's portfolio by weighing each Bond's yield by the market value
    of the Bond and by the amount of time remaining to the date to which the
    Bond is priced (thus creating an average yield for the portfolio of the
    Trust); and (3) reducing the average yield for the portfolio of the Trust
    in order to reflect estimated fees and expenses of the Trust and the
    maximum sales charge paid by investors.  The resulting Estimated Long Term
    Return represents a measure of the return to investors earned over the
    estimated life of the Trust.  (For the Estimated Long Term Return to
    Certificateholders under the monthly, semi-annual and annual distribution
    plans, see "Summary of Essential Information".)

          Estimated Current Return is a measure of the Trust's cash flow. 
    Estimated Current Return is computed by dividing the Estimated Net Annual
    Interest Income per Unit by the Public Offering Price per Unit.  In
    contrast to the Estimated Long Term Return, the Estimated Current Return
    does not take into account the amortization of premium or accretion of
    discount, if any, on the Bonds in the portfolio of the Trust.  Moreover,
    because interest rates on Bonds purchased at a premium are generally
    higher than current interest rates on newly issued bonds of a similar type
    with comparable rating, the Estimated Current Return per Unit may be
    affected adversely if such Bonds are redeemed prior to their maturity.

          The Estimated Net Annual Interest Income per Unit of the Trust will
    vary with changes in the fees and expenses of the Trustee and the
    Evaluator applicable to the Trust and with the redemption, maturity, sale
    or other disposition of the Bonds in the Trust.  The Public Offering Price
    will vary with changes in the bid prices of the Bonds.  Therefore, there
    is no assurance that the present Estimated Current Return or Estimated
    Long Term Return will be realized in the future.  (For the Estimated
    Current Return to Certificateholders under the monthly, semi-annual and
    annual distribution plans, see "Summary of Essential Information".  See
    "Estimated Long Term Return and Estimated Current Return" in Part B of
    this Prospectus.)

          A schedule of cash flow projections is available from the Sponsor
    upon request.
        
          DISTRIBUTIONS.  Distributions of interest income, less expenses,
    will be made by the Trust either monthly, semi-annually or annually
    depending upon the plan of distribution applicable to the Unit purchased. 
    A purchaser of a Unit in the secondary market will initially receive
    distributions in accordance with the distribution plan chosen by the prior
    owner of such Unit and may thereafter change the plan as provided under
    "Interest and Principal Distributions" in Part B of this Prospectus. 
    Distributions of principal, if any, will be made semi-annually on June 15
    and December 15 of each year.  (See "Rights of Certificateholders--
    Interest and Principal Distributions" in Part B of this Prospectus.  For
    estimated monthly, semi-annual and annual interest distributions, see
    "Summary of Essential Information.")
       
          MARKET FOR UNITS.  The Sponsor, although not obligated to do so,
    intends to maintain a secondary market for the Units at prices based on
    the aggregate bid price of the Bonds in the Trust portfolio.  The reoffer
    price will be based on the aggregate bid price of the Bonds plus a sales
    charge of 5.5% of the Public Offering Price (5.820% of the net amount
    invested), plus net accrued interest.  If a market is not maintained a
    Certificateholder will be able to redeem his Units with the Trustee at a
    price also based on the aggregate bid price of the Bonds.  (See
    "Liquidity--Sponsor Repurchase" and "Public Offering--Offering Price" in
    Part B of this Prospectus.)
        
          TOTAL REINVESTMENT PLAN.  Certificateholders under the semi-annual
    and annual plans of distribution have the opportunity to have all their
    regular interest distributions, and principal distributions, if any,
    reinvested in available series of "Insured Municipal Securities Trust" or
    "Municipal Securities Trust."  (See "Total Reinvestment Plan" in Part B of
    this Prospectus.  Residents of Texas see "Total Reinvestment Plan for
    Texas Residents" in Part B of this Prospectus.)  The Plan is not designed
    to be a complete investment program. 

    <PAGE>
       
                        INSURED MUNICIPAL SECURITIES TRUST
                               26TH DISCOUNT SERIES

               SUMMARY OF ESSENTIAL INFORMATION AS OF JUNE 30, 1994

     Date of Deposit:  December 18, 1986        Weighted Average Life to 
     Principal Amount of Bonds ...$11,550,000    Maturity:  19 Years.
     Number of Units .............11,886        Minimum Value of Trust:
     Fractional Undivided Inter-                 Trust may be terminated if
       est in Trust per Unit .....1/11886        value of Trust is less than
     Principal Amount of                         $4,800,000 in principal
       Bonds per Unit ............$971.73        amount of Bonds.
     Secondary Market Public                    Mandatory Termination Date:
       Offering Price**                          The earlier of December 31,
       Aggregate Bid Price                       2035 or the disposition of
         of Bonds in Trust .......$6,272,368+++  the last Bond in the Trust.
       Divided by 11,886 Units ...$527.71       Trustee***:  United States
       Plus Sales Charge of 5.5%                 Trust Company of New York.
         of Public Offering Price $30.71        Trustee's Annual Fee:  Monthly 
       Public Offering Price                     plan $1.03 per $1,000; semi-
         per Unit ................$558.42+       annual plan $.55 per $1,000;
     Redemption and Sponsor's                    and annual plan is $.36 per
       Repurchase Price                          $1,000.
       per Unit ..................$527.71+      Evaluator:  Kenny S&P
                                         +++     Evaluation Services. 
                                         ++++   Evaluator's Fee for Each
     Excess of Secondary Market                  Evaluation:  Minimum of $12
       Public Offering Price                     plus $.25 per each issue of
       over Redemption and                       Bonds in excess of 50 issues
       Sponsor's Repurchase                      (treating separate maturities
       Price per Unit ............$30.71++++     as separate issues).
     Difference between Public                  Sponsor:  Bear, Stearns & Co.
       Offering Price per Unit                   Inc.
       and Principal Amount per                 Sponsor's Annual Fee:  Maximum
       Unit Premium/(Discount) ...$(413.31)      of $.15 per $1,000 principal
     Evaluation Time:  4:00 p.m.                 amount of Bonds (see "Trust
       New York Time.                            Expenses and Charges" in
     Minimum Principal Distribution:             Part B of this Prospectus).
       $1.00 per Unit.

        PER UNIT INFORMATION BASED UPON INTEREST DISTRIBUTION PLAN ELECTED

                                            Monthly   Semi-Annual   Annual
                                            Option      Option      Option


    Gross annual interest income# ......... $42.01      $42.01      $42.01
    Less estimated annual fees and
      expenses ............................   1.75        1.12         .91
    Estimated net annual interest           ______      ______      ______
      income (cash)# ...................... $40.26      $40.89      $41.10
    Estimated interest distribution# ......   3.35       20.44       41.10
    Estimated daily interest accrual# .....  .1118       .1135       .1141
    Estimated current return#++ ...........  7.21%       7.32%       7.36%
    Estimated long term return++ ..........  4.97%       5.08%       5.12%
    Record dates .......................... 1st of      Dec. 1 and   Dec. 1
                                            each month  June 1
    Interest distribution dates ........... 15th of     Dec. 15 and  Dec. 15
                                            each month  June 15
        
    <PAGE>
       *  The Date of Deposit is the date on which the Trust Agreement was
          signed and the deposit of the Bonds with the Trustee made.

      **  For information regarding offering price per Unit and applicable
          sales charge under the Total Reinvestment Plan, see "Total
          Reinvestment Plan" in Part B of this Prospectus. 

     ***  The Trustee maintains its corporate trust office at 770 Broadway,
          New York, New York 10003 (tel. no. 1-800-428-8890).  For information
          regarding redemption by the trustee, see "Trustee Redemption" in
          Part B of this Prospectus.
       
       +  Plus accrued interest to the expected date of settlement
          (approximately five business days after purchase) of $7.53 monthly,
          $10.65 semi-annually and $31.73 annually. 
        
      ++  The estimated current return and estimated long term return are
          increased for transactions entitled to a discount (see "Employee
          Discounts" in Part B of this Prospectus), and are higher under the
          semi-annual and annual options due to lower Trustee's fees and
          expenses.

     +++  Based solely upon the bid side evaluation of the underlying Bonds
          (including, where applicable, undistributed cash from the principal
          account).  Upon tender for redemption, the price to be paid will be
          calculated as described under "Trustee Redemption" in Part B of this
          Prospectus. 

    ++++  See "Comparison of Public Offering Price, Sponsor's Repurchase Price
          and Redemption Price" in Part B of this Prospectus. 

       #  Does not include income accrual from original issue discount bonds,
          if any.

    <PAGE>
       
                          INFORMATION REGARDING THE TRUST
                                AS OF JUNE 30, 1994


    DESCRIPTION OF PORTFOLIO*

          The portfolio of the Trust consists of 26 issues representing
    obligations of issuers located in 25 states and the District of Columbia. 
    The Sponsor has not participated as a sole underwriter or manager, co-
    manager or member of an underwriting syndicate from which any of the
    initial aggregate principal amount of the Bonds were acquired. 
    Approximately 50.9% of the Bonds are obligations of state and local
    housing authorities; approximately 13.1% are hospital revenue bonds;
    approximately .6% were issued in connection with the financing of nuclear
    generating facilities; and none are "mortgage subsidy" bonds.  All of the
    Bonds in the Trust are subject to redemption prior to their stated
    maturity dates pursuant to sinking fund or call provisions.  The Bonds may
    also be subject to other calls, which may be permitted or required by
    events which cannot be predicted (such as destruction, condemnation,
    termination of a contract, or receipt of excess or unanticipated
    revenues).  Two of the issues representing $1,000,000 of the principal
    amount of the Bonds are general obligation bonds.  All 24 of the remaining
    issues representing $10,550,000 of the principal amount of the Bonds are
    payable from the income of a specific project or authority and are not
    supported by the issuer's power to levy taxes.  The portfolio is divided
    for purpose of issue as follows:  Airport 3, Correctional Facilities 1,
    Electric 3, Electric and Gas 1, Federally Insured Mortgage 2, Hospital 8,
    Nuclear Power 1, School 1, Solid Waste 1, Utility 1, Waste Water 1 and
    Water 1.  For an explanation of the significance of these factors see "The
    Trust--Portfolio" in Part B of this Prospectus. 


    *     Changes in the Trust Portfolio:  From July 1, 1994 to September 23,
          1994, the entire principal amount of the Bonds in portfolio no. 5
          has been called for redemption pursuant to pre-refunding provisions
          and is no longer contained in the Trust.  5 Units have been redeemed
          from the Trust.

          As of June 30, 1994, $5,880,000 (approximately 50.9% of the
    aggregate principal amount of the Bonds) were original issue discount
    bonds.  Of these original issue discount bonds, $5,880,000 (approximately
    50.9% of the aggregate principal amount of the Bonds) were Zero Coupon
    Bonds.  Zero Coupon Bonds do not provide for the payment of any current
    interest and provide for payment at maturity at par value unless sooner
    sold or redeemed.  The market value of Zero Coupon Bonds is subject to
    greater fluctuations than coupon bonds in response to changes in interest
    rates.  None of the aggregate principal amount of the Bonds in the Trust
    were purchased at a "market" discount from par value at maturity,
    approximately 49.1% were purchased at a premium and none were purchased at
    par.  For an explanation of the significance of these factors see
    "Discount and Zero Coupon Bonds" in Part B of this Prospectus. 
        
          None of the Bonds in the Trust are subject to the federal individual
    alternative minimum tax under the Tax Reform Act of 1986.  See "Tax
    Status" in Part B of this Prospectus. 


    <PAGE>
                       FINANCIAL AND STATISTICAL INFORMATION


    Selected data for each Unit outstanding for the periods listed below:

                                                                    Distribu-
                                                                    tions of
                                          Distributions of Interest Principal
                                         During the Period (per Unit) During
                             Net Asset*            Semi-              the
                  Units Out-   Value     Monthly   Annual   Annual   Period
    Period Ended   standing   Per Unit   Option    Option   Option  (Per Unit)

       
    June 30, 1992   12,000     $597.45   $43.29    $43.95   $44.23   $ 1.66
    June 30, 1993   12,000      597.04    43.05     43.77    44.08     1.67
    June 30, 1994   11,886      538.92    41.89     42.58    43.77    29.49


    *     Net Asset Value per Unit is calculated by dividing net assets as
          disclosed in the "Statement of Net Assets" by the number of Units
          outstanding as of the date of the Statement of Net Assets.  See
          Note 5 of Notes to Financial Statements for a description of the
          components of Net Assets.

        
<PAGE>

Independent Auditors' Report

The Sponsor, Trustee and Certificateholders
Insured Municipal Securities Trust, 26th Discount Series:


We have audited the accompanying statement of net assets, including the
portfolio, of Insured Municipal Securities Trust, 26th Discount Series 
as of June 30, 1994, and the related statements of operations, and 
changes in net assets for each of the years in the three year period
then ended.  These financial statements are the responsibility of the
Trustee (see note 2).  Our responsibility is to express an opinion on
these financial statements 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 financial statements
are free of material misstatement.  An audit includes examining, on a
test basis, evidence supporting the amounts and disclosures in the
financial statements.  Our procedures included confirmation of
securities owned as of June 30, 1994, by correspondence with the 
Trustee.  An audit also includes assessing the accounting principles
used and significant estimates made by management, as well as
evaluating the overall financial statement presentation.  We believe
that our audits provide a reasonable basis for our opinion.

In our opinion, the financial statements referred to above present
fairly, in all material respects, the financial position of Insured
Municipal Securities Trust, 26th Discount Series as of June 30, 1994,
and the results of its operations and the changes in its net assets
for each of the years in the three year period then ended, in conformity
with generally accepted accounting principles.


    KPMG Peat Marwick LLP


New York, New York
September 15, 1994
<PAGE>
<TABLE>
                  INSURED MUNICIPAL SECURITIES TRUST, 26TH DISCOUNT SERIES

                              Statement of Net Assets

                                   June 30, 1994
<S>                                                                      <C>
       Investments in marketable securities,
          at market value (cost     $6,626,798)                          $   6,284,001
       Excess of other assets over total liabilities                           121,550
                                                                           ------------

       Net assets 11,886 units    of fractional undivided
          interest outstanding,   $538.92 per    unit)                   $   6,405,551
                                                                           ============

       See accompanying notes to financial statements.
</TABLE>
<PAGE>
<TABLE> 
              INSURED MUNICIPAL SECURITIES TRUST, 26TH DISCOUNT SERIES

                              Statements of Operations
<CAPTION>
                                                             Years ended June 30,
                                                -----------       -----------       -----------
                                                   1994              1993              1992
                                                -----------       -----------       -----------
<S>                                          <C>                  <C>               <C> 
     Investment income - interest            $     544,690           561,047           564,372
                                                -----------       -----------       -----------

     Expenses:
        Trustee's fees                              13,278            13,725            13,295
        Evaluator's fees                             3,584             3,412             3,024
        Sponsor's fees                               1,795             1,798             1,800
                                                -----------       -----------       -----------

                   Total expenses                   18,657            18,935            18,119
                                                -----------       -----------       -----------

                   Investment income, net          526,033           542,112           546,253
                                                -----------       -----------       -----------

     Realized and unrealized gain (loss)
        on investments:
          Net realized loss on bonds
            sold or called                         (57,266)           (3,435)           (3,436)
          Unrealized appreciation
            (depreciation) for the year           (307,726)           (4,966)          149,838
                                                -----------       -----------       -----------

                Net gain (loss) on
                      investments                 (364,992)           (8,401)          143,402
                                                -----------       -----------       -----------

                Net increase in net
                  assets resulting
                  from operations            $     161,041           533,711           689,655
                                                ===========       ===========       ===========

     See accompanying notes to financial statements.
</TABLE>
<PAGE>
<TABLE>
                 INSURED MUNICIPAL SECURITIES TRUST, 26TH DISCOUNT SERIES

                            Statements of Changes in Net Assets
<CAPTION>
                                                               Years ended June 30,
                                                  ------------     ------------     ------------
                                                      1994             1993             1992
                                                  ------------     ------------     ------------
<S>                                             <C>                <C>              <C>
      Operations:
         Investment income, net                 $     526,033          542,112          546,253
         Net realized loss on bonds
           sold or called                             (57,266)          (3,435)          (3,436)
         Unrealized appreciation
           (depreciation) for the year               (307,726)          (4,966)         146,838
                                                  ------------     ------------     ------------

                       Net increase in net
                         assets resulting
                         from operations              161,041          533,711          689,655
                                                  ------------     ------------     ------------

      Distributions to Certificateholders:
          Investment income                           502,852          518,572          521,285
          Principal                                   351,421           20,040           19,920

      Redemptions:
          Interest                                      1,787           -                -
          Principal                                    63,927           -                -
                                                  ------------     ------------     ------------

                     Total distributions
                       and redemptions                919,987          538,612          541,205
                                                  ------------     ------------     ------------

                     Total increase (decrease)       (758,946)          (4,901)         148,450

      Net assets at beginning of year               7,164,497        7,169,398        7,020,948
                                                  ------------     ------------     ------------

      Net assets at end of year (including
         undistributed net investment
         income of   $269,022,    $247,628 and
         $224,088, respectively)                $   6,405,551        7,164,497        7,169,398
                                                  ============     ============     ============

      See accompanying notes to financial statements.
</TABLE> 
<PAGE>
INSURED MUNICIPAL SECURITIES TRUST, 26TH DISCOUNT SERIES

Notes to Financial Statements

June 30, 1994, 1993 and 1992


(1)    Organization and Financial and Statistical Information

Insured Municipal Securities Trust, 26th Discount Series (Trust) was
organized on December 18, 1986 (date of deposit) by Bear, Stearns &
Co. Inc, (Sponsor) under the laws of the State of New York by a Trust
Indenture and Agreement, and is registered under the Investment
Company Act of 1940.

(2)    Summary of Significant Accounting Policies

United States Trust Company of New York (Trustee) has custody of and
responsibility for the accounting records and financial statements of
the Trust and is responsible for establishing and maintaining a
system of internal control related thereto.

The Trustee is also responsible for all estimates of expenses and
accruals reflected in the Trust's financial statements.  The
accompanying financial statements have been adjusted to record the
unrealized appreciation (depreciation) of investments and to record
interest income and expenses on the accrual basis.

The discount on the zero-coupon bonds is accreted by the interest
method over the respective lives of the bonds.  The accretion of such
discount is included in interest income; however, it is not
distributed until realized in cash upon maturity or sale of the
respective bonds.

Investments are carried at market value which is determined by either
Standard & Poor's Corporation or Moody's Investors Service, Inc.
(Evaluator) as discussed in the footnotes to the portfolio.  The
market value of the investments based upon the bid prices for the
bonds at the end of the year, except that the market value on the
date of deposit represents the cost to the Trust based on the
offering prices for investments at that date.  The difference between
cost (including accumulated accretion of original issue discount on
zero-coupon bonds) and market value is reflected as unrealized
appreciation (depreciation) of investments.  Securities transactions
are recorded on the trade date.  Realized gains (losses) from
securities transactions are determined on the basis of average cost
of the securities sold or redeemed.

(3)    Income Taxes

The Trust is not subject to Federal income taxes as provided for by
the Internal Revenue Code.

(4)    Trust Administration

The fees and expenses of the Trust are incurred and paid on the basis
set forth under "Trust Expenses and Charges" in Part B of this
Prospectus.

The Trust Indenture and Agreement provides for interest distributions
as often as monthly (depending upon the distribution plan elected by
the Certificateholders).

The Trust Indenture and Agreement further requires that principal
received from the disposition of bonds, other than those bonds sold
in connection with the redemption of units, be distributed to
Certificateholders.

See "Financial and Statistical Information" in Part A of this
Prospectus for the amounts of per unit distributions during the years
ended June 30, 1994, 1993 and 1992.

The Trust Indenture and Agreement also requires the Trust to redeem
units tendered.  114 units were redeemed during the year ended June
30, 1994.  No units were redeemed during the years ended June 30,
1993 and 1992.

(5)    Net Assets

At June 30, 1994, the net assets of the Trust represented the
interest of Certificateholders as follows:

      Original cost to Certificateholders                   $ 7,424,707
      Less initial gross underwriting commission               (408,360)

                                                              7,016,347

      Cost of securities sold or called                        (525,388)
      Net unrealized depreciation                              (342,797)
      Undistributed net investment income                       269,022
      Distributions in excess of proceeds
        from bonds sold or called                               (11,633)

          Total                                             $ 6,405,551


The original cost to Certificateholders, less the initial gross
underwriting commission, represents the aggregate initial public
offering price net of the applicable sales charge on 12,000 units of
fractional undivided interest of the Trust as of the date of deposit.

Undistributed net investment income includes accumulated accretion of
original issue discount of $135,839.
<PAGE>
<TABLE> 
INSURED MUNICIPAL SECURITIES TRUST, 26TH DISCOUNT SERIES
Portfolio
June 30, 1994
<CAPTION>
Port-       Aggregate                                     Coupon Rate/   Redemption Feature
folio      Principal       Name of Issuer       Ratings   Date(s) of     S.F.--Sinking Fund       Market
No.          Amount      and Title of Bonds       (1)     Maturity(2)    Ref.--Refunding(2)(7)    Value(3)
- ------    -----------   ---------------------   -------   ------------   ---------------------    ---------
<S>    <C>              <C>                     <C>       <C>            <C>                   <C>
    1  $      600,000   Municipality of           AAA     7.625%         12/01/07 @ 100 S.F.   $    644,748
                        Anchorage, Alaska                 12/01/2015     6/01/96 @ 102 Ref.
                        Senior Lien Refunding
                        Electric Revenue
                        Bonds, 1986 Series A
                        (MBIA) (5)

    2          75,000   Halifax Hospital          AAA     9.625          12/01/02 @ 100 S.F.         82,445
                        Medical Center,                   12/01/2014     12/01/95 @ 103 Ref.
                        Volusia County,
                        Florida Refunding
                        Hospital Revenue
                        Bonds, Series 1985 A
                        (MBIA) (5)

    3          50,000   Hillsborough County,      AAA     10.250         10/01/00 @ 100 S.F.         51,798
                        Florida Solid Waste               10/01/2002     10/01/94 @ 102 Ref.
                        and Resource Recovery
                        Revenue Bonds, Series
                        1984 A (MBIA)

    4         300,000   Hillsborough County,      AAA     8.750          12/01/04 @ 100 S.F.        352,236
                        Florida Refunding and             12/01/2006     12/01/99 @ 100 Ref.
                        Improvement Utility
                        Revenue Bonds, Series
                        1985 (MBIA) (5)

    5          50,000   The Dalton-Whitfield      AAA     10.500         7/01/04 @ 100 S.F.          50,999
                        County Hospital                   7/01/2009      7/01/94 @ 102 Ref.
                        Authority (Georgia)
                        Revenue Anticipation
                        Certificates, Series
                        1984 (MBIA) (5)

    6          40,000   Fayette County,           AAA     8.000          10/01/00 @ 100 S.F.         43,606
                        Georgia Water Revenue             10/01/2011     10/01/96 @ 102 Ref.
                        Bonds, Series 1986
                        (MBIA)

    7         275,000   Illinois Health           AAA     9.375          11/01/05 @ 100 S.F.        297,723
                        Facility Authority                11/01/2013     11/01/95 @ 102 Ref.
                        Revenue Bonds
                        (Children's Memorial
                        Hospital), 1985
                        Series A (BIG) (5)

    8          65,000   City of Chicago           AAA     10.375         1/01/00 @ 100 S.F.          68,994
                        (Illinois) Chicago                1/01/2009      1/01/95 @ 103 Ref.
                        O'Hare International
                        Airport General
                        Airport Revenue
                        Bonds, 1984 Series B
                        (MBIA)

    9         600,000   Chicago Illinois          AAA     7.700          No Sinking Fund            629,310
                        School Finance                    6/01/2006      6/01/95 @ 102 Ref.
                        Authority Revenue
                        Bonds (BIG) (5)

   10         100,000   Kentucky Local            AAA     10.375         11/01/99 @ 100 S.F.        105,314
                        Correctional                      11/01/2009     11/01/94 @ 103 Ref.
                        Facilities
                        Construction
                        Authority,
                        Multi-County
                        Correctional
                        Facilities Revenue
                        Bonds, Series 1984
                        (Financial Guaranty)
                        (5)

   11          75,000   Louisiana Energy and      AAA     9.000          1/01/00 @ 100 S.F.          78,164
                        Power Authority Power             1/01/2004      1/01/95 @ 102 Ref.
                        Project Revenue
                        Bonds, (Rodemacher
                        Unit No. 2), Series
                        1985 (Financial
                        Guaranty) (5)

   12         500,000   The City of New           AAA     9.000          8/01/06 @ 100 S.F.         538,405
                        Orleans (Louisiana)               8/01/2015      8/01/95 @ 103 Ref.
                        International Airport
                        General Purpose
                        Revenue Bonds, Series
                        1985 (MBIA) (5)

   13         175,000   Health and                AAA     9.875          4/01/05 @ 105 S.F.         185,381
                        Educational Facility              4/01/2015      4/01/95 @ 102 Ref.
                        Authorities of the
                        State of Missouri
                        Health Facility
                        Revenue Bonds
                        (Deaconess Hospital
                        Project), Series 1985
                        (Financial Guaranty)
                        (5)

   14         125,000   York County, Nebraska     AAA     9.375          1/01/01 @ 100 S.F.         130,820
                        Rural Public Power                1/01/2017      1/01/95 @ 102 Ref.
                        District Electric
                        System Revenue Bonds,
                        1985 Series B (MBIA)

   15          65,000   Mercer County, North      AAA     10.500         6/30/09 @ 100 S.F.          68,385
                        Dakota Pollution                  6/30/2013      12/30/94 @ 102 Ref.
                        Control Revenue
                        Bonds, Series 1984
                        (Basin Electric Power
                        Cooperative -
                        Antelope Valley
                        Station) (AMBAC)

   16         250,000   Metropolitan              AAA     9.750          7/01/05 @ 100 S.F.         268,768
                        Nashville Airport                 7/01/2015      7/01/95 @ 102 Ref.
                        Authority (Tennessee)
                        Revenue Bonds, Series
                        1985 (Financial
                        Guaranty)

   17         500,000   Brownsville, Texas        AAA     7.750          No Sinking Fund            532,225
                        Independent School                8/15/2000      8/15/96 @ 100 Ref.
                        District Unlimited
                        Tax School Building
                        Bonds, Series 1986 A
                        (AMBAC) (5)

   18         110,000   Denton, Texas Health      AAA     9.500          8/01/01 @ 100 S.F.         118,417
                        Facilities                        8/01/2011      8/01/95 @ 102 Ref.
                        Development
                        Corporation Health
                        Facility Revenue
                        Bonds (The
                        Evangelical-Lutheran-Good

                        Samaritan Society
                        Project), Series 1985
                        A (AMBAC)

   19         500,000   North Central Texas       AAA     9.500          10/01/11 @ 100 S.F.        542,470
                        Health Facilities                 10/01/2015     10/01/95 @ 102 Ref.
                        Development
                        Corporation Hospital
                        Refunding Revenue
                        Bonds, Series 1985 A
                        (Methodist Hospitals
                        of Dallas (BIG)

   20         500,000   Pflugerville, Texas       AAA     8.000          No Sinking Fund            533,930
                        Independent School                8/01/2002      8/01/96 @ 100 Ref.
                        District, School
                        Building Unlimited
                        Tax Bonds, Series
                        1986 (MBIA) (5)

   21         310,000   City of San Antonio,      AAA     9.375          2/01/05 @ 100 S.F.         323,336
                        Texas Electric and                2/01/2009      2/01/95 @ 101.5 Ref.
                        Gas System
                        Improvement Bonds,
                        New Series 1985 A
                        (BIG) (5)

   22          75,000   Trinity River             AAA     10.100         No Sinking Fund             79,430
                        Authority of Texas                8/01/2007      8/01/95 @ 100 Ref.
                        (Ten Mile Creek
                        System) Revenue
                        Bonds, Series 1984
                        (AMBAC) (5)

   23         230,000   The County Commission     AAA     9.375          6/01/01 @ 100 S.F.         244,603
                        of Monongalia County              6/01/2018      6/01/95 @ 102 Ref.
                        Hospital Revenue
                        Bonds, West Virginia
                        (Virginia University
                        Hospitals, Inc.
                        Issue) Series 1985 A
                        (MBIA) (5)

   24          70,000   Wisconsin Health          AAA     10.625         10/01/02 @ 100 S.F.         72,666
                        Facilities Authority              10/01/2012     10/01/94 @ 102 Ref.
                        Revenue Bonds, Series
                        1984 (Sisters of the
                        Sorrowful
                        Mother-Ministry
                        Corporation) (MBIA)
                        (5)

   24a         30,000   Wisconsin Health          AAA     10.625         10/01/02 @ 100 S.F.         31,108
                        Facilities Authority              10/01/2012     10/01/94 @ 102 Ref.
                        Revenue Bonds, Series
                        1984 (Sisters of the
                        Sorrowful
                        Mother-Ministry
                        Corporation) (MBIA)

   25       2,865,000   The District of           AAA     0.000          5/01/05 @ 11.975 S.F.      116,491
                        Columbia Finance                  11/01/2025     11/01/08 @ 17.206
                        Corporation Mortgage                             Ref.
                        Revenue Bonds, Series
                        1983 (FHA Insured
                        Mortgage Loan -
                        Congress Park II
                        Apartments, Section 8
                        Assisted Project)
                        (MBIA)

   26       3,015,000   Baltimore County,         AAA     0.000          2/01/11 @ 18.025 S.F.       92,229
                        Maryland Mortgage                 2/01/2027      2/01/98 @ 4.480 Ref.
                        Revenue Bonds, Series
                        1985 (FHA Insured
                        Mortgage Loan - Old
                        Orchard Apartments
                        Project) (MBIA)
          -----------                                                                             ---------

        $  11,550,000                                                                          $  6,284,001
          ===========                                                                             =========

 See accompanying footnotes to the portfolio and notes to the financial statements
</TABLE>
<PAGE>
INSURED MUNICIPAL SECURITIES TRUST, 26TH DISCOUNT SERIES

Footnotes to Portfolio

June 30, 1994


(1)    All ratings are by Standard & Poor's Corporation.  A brief 
description of the ratings symbols and their meanings is set forth 
under "Description of Bond Ratings" in Part B of this Prospectus.

(2)    See "The Trust - Portfolio" in Part B of this Prospectus for an
explanation of redemption features.  See "Tax Status" in Part B of
this Prospectus for a statement of the Federal tax consequences to a
Certificateholder upon the sale, redemption or maturity of a bond.

(3)   At June 30, 1994, the net unrealized depreciation of all the
bonds was comprised of the following:

    Gross unrealized appreciation                     $      44,397
    Gross unrealized depreciation                          (387,194)

    Net unrealized depreciation                       $    (342,797)

(4)    The annual interest income, based upon the bonds held at June 30,
1994, (excluding accretion of original issue discount on zero-coupon 
bonds) to the Trust is $ 499,369.

(5)    The bonds have been prerefunded and will be redeemed at the next
refunding call date.

(6)    Bonds sold or called after June 30, 1994 are noted in a footnote
"Changes in Trust Portfolio" under "Description of Portfolio" in Part A
of this Prospectus.

(7)    The Bonds may also be subject to other calls, which may be 
permitted or required by events which cannot be predicted (such as
destruction, condemnation, termination of a contract, or receipt of
excess or unanticipated revenues).

<PAGE>



              Note:  Part B of This Prospectus May Not Be Distributed
                     Unless Accompanied by Part A.                   

                         Please Read and Retain Both Parts
                     of This Prospectus For Future Reference.


                        INSURED MUNICIPAL SECURITIES TRUST

                                 Prospectus Part B
       
                             Dated:  October 28, 1994
        

                                     THE TRUST

    Organization

               "Insured Municipal Securities Trust" (the "Trust") consists of
    the "unit investment trust" designated as set forth in Part A.*  The
    Trust was created under the layws of the State of New York pursuant to a
    Trust Indenture and Agreement** (collectively, the "Trust Agreement"),
    dated the Date of Deposit, among Bear, Stearns & Co. Inc., as Sponsor,
    Kenny S&P Evaluation Services, as Evaluator, and, depending on the
    particular Trust, either The Bank of New York or United States Trust
    Company of New York, as Trustee.  The name of the Trustee for the Trust is
    contained in the "Summary of Essential Information" in Part A.  For a
    description of the Trustee for a particular Trust, see "Trust
    Administration--The Trustee."

    *     This Part B relates to the outstanding series of Insured Municipal
          Securities Trust or Insured Municipal Securities Discount Trust as
          reflected in Part A attached hereto.


    **    References in this Prospectus to the Trust Agreement are qualified
          in their entirety by the Trust Indenture and Agreement which is
          incorporated herein.

    <PAGE>

               On the Date of Deposit the Sponsor deposited with the Trustee
    long-term insured bonds, and/or delivery statements relating to contracts
    for the purchase of certain such bonds (the "Bonds") and cash or an
    irrevocable letter of credit issued by a major commercial bank in the
    amount required for such purchases.  Thereafter, the Trustee, in exchange
    for the Bonds so deposited delivered to the Sponsor the Certificates
    evidencing the ownership of all Units of the Trust.  The Trust consists of
    the Bonds described under "The Trust" in Part A, the interest (including,
    where applicable, earned original issue discount) on which, in the
    opinions of bond counsel to the respective issuers given at the time of
    original delivery of the Bonds, is exempt from regular federal income tax
    under existing law. 

               Each "Unit" outstanding on the Evaluation Date represented an
    undivided interest or pro rata share in the principal and interest of the
    Trust in the ratio of one Unit to the principal amount of Bonds in the
    Trust on such date as specified in Part A of this Prospectus.  To the
    extent that any Units are redeemed by the Trustee, the fractional
    undivided interest or pro rata share in the Trust represented by each
    unredeemed Unit will increase, although the actual interest in the Trust
    represented by such fraction will remain unchanged.  Units will remain
    outstanding until redeemed upon tender to the Trustee by Certificate-
    holders, which may include the Sponsor or the Underwriters, or until the
    termination of the Trust Agreement. 

    Objectives

               The Trust, one of a series of similar but separate unit
    investment trusts formed by the Sponsor, offers investors the opportunity
    to participate in a portfolio of long-term insured tax-exempt bonds with a
    greater diversification than they might be able to acquire themselves. 
    The objectives of the Trust are to preserve capital and to provide
    interest income (including, where applicable, earned original issue
    discount) which, in the opinions of bond counsel given at the time of
    original delivery of the Bonds, is exempt from regular federal income tax
    under existing law.  Such interest income may, however, be subject to the
    federal, individual and corporate alternative minimum taxes and to state
    and local taxes.  (See "Description of Portfolio" in Part A for a list of
    those Bonds which pay interest income subject to federal individual
    alternative minimum tax.  See also "Tax Status".)  Consistent with such
    objectives, the Sponsor has obtained bond insurance guaranteeing the
    scheduled payment of principal and interest on certain of the Bonds and
    has purchased, as to the remainder of each Trust Portfolio, Bonds which
    are already covered by insurance.  (See "Insurance on the Bonds".)  An
    investor will realize taxable income upon maturity or early redemption of
    the market discount bonds in a Trust portfolio and will realize, where
    applicable, tax-exempt income to the extent of the earned portion of
    interest, including original issue discount earned on the Bonds in a Trust
    portfolio.  Investors should be aware that there is no assurance the
    Trust's objectives will be achieved as these objectives are dependent on
    the continuing ability of the issuers of the Bonds to meet their interest
    and principal payment requirements, on the abilities of the Insurance
    Companies to meet their obligations under the policies of insurance issued
    on the Bonds, on the continuing satisfaction of the Bonds of the
    conditions required for the exemption of interest thereon from regular
    federal income tax and on the market value of the Bonds, which can be
    affected by fluctuations in interest rates and other factors. 

               Since disposition of Units prior to final liquidation of each
    Trust may result in an investor receiving less than the amount paid for
    such Units (see "Comparison of Public Offering Price, Sponsor's Repurchase
    Price and Redemption Price"), the purchase of a Unit should be looked upon
    as a long-term investment.  Neither the Trust nor the Total Reinvestment
    Plan are designed to be complete investment programs. 

    Portfolio
       
               All of the Bonds in the Trust were rated "AAA" by Standard &
    Poor's Corporation at the time originally deposited in the Trust.  (See
    "Insurance on the Bonds".)  The "AAA" rating was assigned to the Bonds by
    Standard & Poor's because each Bond was insured by a municipal bond
    guaranty insurance policy issued by a company whose claims-paying ability
    was rated "AAA" by Standard & Poor's at that time.  In the event of a
    downgrading of the claims-paying ability of one of the insurers, as of the
    Evaluation Date, the Bonds in the Trusts which are insured by that company
    would no longer be rated "AAA" by Standard & Poor's.  The Units of Trusts
    containing the downgraded bonds are no longer rated "AAA."
        
               For information regarding (i) the number of issues in the
    Trust, (ii) the range of fixed maturities of the Bonds, (iii) the number
    of issues payable from the income of a specific project or authority and
    (iv) the number of issues constituting general obligations of a government
    entity, see "The Trust" and "Description of Portfolio" in Part A of this
    Prospectus. 

               When selecting Bonds for a Trust, the following factors, among
    others, were considered by the Sponsor:  (a) the quality of the Bonds and
    whether such Bonds, whether Sponsor-Insured or Pre-Insured, were rated
    "AAA" by Standard & Poor's Corporation, (b) the yield and price of the
    Bonds relative to other tax-exempt securities of comparable quality and
    maturity, (c) income to the Certificateholders of the Trust, (d) whether a
    bond was insured, or insurance was available for the Bonds at a reasonable
    cost, (e) in connection with Bonds for which bond insurance was obtained
    by the Sponsor, the quality of the Bonds and whether they were rated,
    without regard to such bond insurance, "A" or better by either Standard &
    Poor's Corporation or Moody's Investors Service, and (f) the
    diversification of the Trust portfolio, as to purpose of issue and
    location of issuer, taking into account the availability in the market of
    issues which meet the Trust's quality, rating, yield and price criteria. 
    Subsequent to the Date of Deposit, a Bond may cease to be rated or its
    rating may be reduced below that specified above.  Neither event requires
    an elimination of such Bond from a Trust but may be considered in the
    Sponsor's determination to direct the Trustee to dispose of the Bond.  See
    "Portfolio Supervision."  For an interpretation of the bond ratings see
    "Description of Bond Ratings."
       
               Housing Bonds.  Some of the aggregate principal amount of the
    Bonds may consist of obligations of state and local housing authorities
    whose revenues are primarily derived from mortgage loans to rental housing
    projects for low to moderate income families.  Since such obligations are
    usually not general obligations of a particular state or municipality and
    are generally payable primarily or solely from rents and other fees,
    adverse economic developments including failure or inability to increase
    rentals, fluctuations of interest rates and increasing construction and
    operating costs may reduce revenues available to pay existing obligations. 
    See "Description of Portfolio" in Part A for the amount of rental housing
    bonds contained therein.
        
               Hospital Revenue Bonds.  Some of the aggregate principal amount
    of the Bonds may consist of hospital revenue bonds.  Ratings of hospital
    bonds are often initially based on feasibility studies which contain
    projections of occupancy levels, revenues and expenses.  Actual experience
    may vary considerably from such projections.  A hospital's gross receipts
    and net income will be affected by future events and conditions including,
    among other things, demand for hospital services and the ability of the
    hospital to provide them, physicians' confidence in hospital management
    capability, economic developments in the service area, competition,
    actions by insurers and governmental agencies and the increased cost and
    possible unavailability of malpractice insurance.  Additionally, a major
    portion of hospital revenue typically is derived from federal or state
    programs such as Medicare and Medicaid which have been revised
    substantially in recent years and which are undergoing further review at
    the state and federal level.
       
               Proposals for significant changes in the health care system and
    the present programs for third party payment of health care costs are
    under consideration in Congress and many states.  Future legislation or
    changes in the areas noted above, among other things, would affect all
    hospitals to varying degrees and, accordingly, any adverse change in these
    areas may affect the ability of such issuers to make payment of principal
    and interest on such bonds.  See "Description of Portfolio" in Part A for
    the amount of hospital revenue bonds contained therein.
        
               Nuclear Power Facility Bonds.  Certain Bonds may have been
    issued in connection with the financing of nuclear generating facilities. 
    In view of recent developments in connection with such facilities,
    legislative and administrative actions have been taken and proposed
    relating to the development and operation of nuclear generating
    facilities.  The Sponsor is  unable to predict whether any such actions or
    whether any such proposals or litigation, if enacted or instituted, will
    have an adverse impact on the revenues available to pay the debt service
    on the Bonds in the portfolio issued to finance such nuclear projects. 
    See "Description of Portfolio" in Part A for the amount of bonds issued to
    finance nuclear generating facilities contained therein.

               Mortgage Subsidy Bonds.  Certain Bonds may be "mortgage subsidy
    bonds" which are obligations of which all or a significant portion of the
    proceeds are to be used directly or indirectly for mortgages on owner-
    occupied residences.  Section 103A of the Internal Revenue Code of 1954,
    as amended, provided as a general rule that interest on "mortgage subsidy
    bonds" will not be exempt from Federal income tax.  An exception is
    provided for certain "qualified mortgage bonds."  Qualified mortgage bonds
    are bonds that are used to finance owner-occupied residences and that meet
    numerous statutory requirements.  These requirements include certain
    residency, ownership, purchase price and target area requirements, ceiling
    amounts for state and local issuers, arbitrage restrictions and (for bonds
    issued after December 31, 1984) certain information reporting,
    certification, public hearing and policy statement requirements.  In the
    opinions of bond counsel to the issuing governmental authorities, interest
    on all the Bonds in a Trust that might be deemed "mortgage subsidy bonds"
    will be exempt from Federal income tax when issued.  See "Description of
    Portfolio" in Part A for the amount of mortgage subsidy Bonds contained
    therein. 

               Mortgage Revenue Bonds.  Certain Bonds may be "mortgage revenue
    bonds."  Under the Internal Revenue Code of 1986, as amended (the "Code")
    (and under similar provisions of the prior tax law) "mortgage revenue
    bonds" are obligations the proceeds of which are used to finance owner-
    occupied residences under programs which meet numerous statutory
    requirements relating to residency, ownership, purchase price and target
    area requirements, ceiling amounts for state and local issuers, arbitrage
    restrictions, and certain information reporting certification, and public
    hearing requirements.  There can be no assurance that additional federal
    legislation will not be introduced or that existing legislation will not
    be further amended, revised, or enacted after delivery of these Bonds or
    that certain required future actions will be taken by the issuing
    governmental authorities, which action or failure to act could cause
    interest on the Bonds to be subject to federal income tax.  If any portion
    of the Bonds proceeds are not committed for the purpose of the issue,
    Bonds in such amount could be subject to earlier mandatory redemption at
    par, including issues of Zero Coupon Bonds (see "Discount and Zero Coupon
    Bonds").  See "Description of Portfolio" in Part A for the amount of
    mortgage revenue bonds contained therein. 
       
               Private Activity Bonds.  The portfolio of the Trust may contain
    other Bonds which are "private activity bonds" (often called Industrial
    Revenue Bonds ("IRBs") if issued prior to 1987) which would be primarily
    of two types:  (1) Bonds for a publicly owned facility which a private
    entity may have a right to use or manage to some degree, such as an
    airport, seaport facility or water system and (2) facilities deemed owned
    or beneficially owned by a private entity but which were financed with
    tax-exempt bonds of a public issuer, such as a manufacturing facility or a
    pollution control facility.  In the case of the first type, bonds are
    generally payable from a designated source of revenues derived from the
    facility and may further receive the benefit of the legal or moral
    obligation of one or more political subdivisions or taxing jurisdictions. 
    In most cases of project financing of the first type, receipts or revenues
    of the Issuer are derived from the project or the operator or from the
    unexpended proceeds of the bonds.  Such revenues include user fees,
    service charges, rental and lease payments, and mortgage and other loan
    payments.
        
               The second type of issue will generally finance projects which
    are owned by or for the benefit of, and are operated by, corporate
    entities.  Ordinarily, such private activity bonds are not general
    obligations of governmental entities and are not backed by the taxing
    power of such entities, and are solely dependent upon the creditworthiness
    of the corporate user of the project or corporate guarantor.

               The private activity bonds in the Trust have generally been
    issued under bond resolutions, agreements or trust indentures pursuant to
    which the revenues and receipts payable under the issuer's arrangements
    with the users or the corporate operator of a particular project have been
    assigned and pledged to the holders of the private activity bonds.  In
    certain cases a mortgage on the underlying project has been assigned to
    the holders of the private activity bonds or a trustee as additional
    security.  In addition, private activity bonds are frequently directly
    guaranteed by the corporate operator of the project or by another
    affiliated company.  See "Description of Portfolio" in Part A for the
    amount of private activity bonds contained therein.

               Litigation.  Litigation challenging the validity under state
    constitutions of present systems of financing public education has been
    initiated in a number of states.  Decisions in some states have been
    reached holding such school financing in violation of state constitutions. 
    In addition, legislation to effect changes in public school financing has
    been introduced in a number of states.  The Sponsor is unable to predict
    the outcome of the pending litigation and legislation in this area and
    what effect, if any, resulting changes in the sources of funds, including
    proceeds from property taxes applied to the support of public schools, may
    have on the school bonds in a Trust. 

               To the Sponsor's knowledge, there is no litigation pending as
    of the Date of Deposit with respect to any Bonds which might reasonably be
    expected to have a material adverse effect on a Trust.  Subsequent to the
    Date of Deposit, litigation may be initiated on a variety of grounds with
    respect to Bonds in a Trust.  Such litigation, as, for example, suits
    challenging the issuance of pollution control revenue bonds under
    recently-enacted environmental protection statutes, may affect the
    validity of such Bonds or the tax-free nature of the interest thereon. 
    The Sponsor is unable to predict whether any such litigation may be
    instituted or, if instituted, whether it might have a material adverse
    effect on a Trust. 
       
               Other Factors.  The Bonds in the Trust, despite their optional
    redemption provisions which generally do not take effect until 10 years
    after the original issuance dates of such bonds (often referred to as "ten
    year call protection"), do contain provisions which require the issuer to
    redeem such obligations at par from unused proceeds of the issue within a
    stated period.  In recent periods of declining interest rates there have
    been increased redemptions of bonds, particularly housing bonds, pursuant
    to such redemption provisions.  In addition, the Bonds in the Trusts are
    also subject to mandatory redemption in whole or in part at par at any
    time that voluntary or involuntary prepayments of principal on the
    underlying collateral are made to the trustee for such bonds or that the
    collateral is sold by the bond issuer.  Prepayments of principal tend to
    be greater in periods of declining interest rates; it is possible that
    such prepayments could be sufficient to cause a bond to be redeemed
    substantially prior to its stated maturity date, earliest call date or
    sinking fund redemption date.  

               The Bonds may also be subject to other calls, which may be
    permitted or required by events which cannot be predicted (such as
    destruction, condemnation, or termination of a contract).

               In 1976 the federal bankruptcy laws were amended so that an
    authorized municipal debtor could more easily seek federal court
    protection to assist in reorganizing its debts so long as certain
    requirements were met.  Historically, very few financially troubled
    municipalities have sought court assistance for reorganizing their debts;
    notwithstanding, the Sponsors are unable to predict to what extent
    financially troubled municipalities may seek court assistance in
    reorganizing their debts in the future and, therefore, what effect, if
    any, the applicable federal bankruptcy law provisions will have on the
    Trusts.
        
               The Trust may also include "moral obligation" bonds.  Under
    statutes applicable to such bonds, if any issuer is unable to meet its
    obligations, the repayment of such bonds becomes a moral commitment but
    not a legal obligation of the state or municipality in question.  See
    "Portfolio" and "Information Regarding the Trust" in Part A of this
    Prospectus for the amount of moral obligation bonds contained in each
    Trust. 

               Certain of the Bonds in the Trust are subject to redemption
    prior to their stated maturity dates pursuant to sinking fund or call
    provisions.  A sinking fund is a reserve fund appropriated specifically
    toward the retirement of a debt.  A callable bond is one which is subject
    to redemption or refunding prior to maturity at the option of the issuer. 
    A refunding is a method by which a bond is redeemed at or before maturity
    from the proceeds of a new issue of bonds.  In general, call provisions
    are more likely to be exercised when the offering side evaluation of a
    bond is at a premium over par than when it is at a discount from par.  A
    listing of the sinking fund and call provisions, if any, with respect to
    each of the Bonds is contained under "Portfolio".  Certificateholders will
    realize a gain or loss on the early redemption of such Bonds, depending
    upon whether the price of such Bonds is at a discount from or at a premium
    over par at the time Certificateholders purchase their Units. 

               Neither the Sponsor nor the Trustee shall be liable in any way
    for any default, failure or defect in any of the Bonds.  Because certain
    of the Bonds from time to time may be redeemed or will mature in
    accordance with their terms or may be sold under certain circumstances, no
    assurance can be given that a Trust will retain its present size and
    composition for any length of time.  The proceeds from the sale of a Bond
    or the exercise of any redemption or call provision will be distributed to
    Certificateholders on the next distribution date, except to the extent
    such proceeds are applied to meet redemptions of Units.  See "Trustee
    Redemption."

    Discount And Zero Coupon Bonds

               Some of the Bonds in a Trust may be original issue discount
    bonds.  The original issue discount, which is the difference between the
    initial purchase price of the Bonds and the face value, is deemed to
    accrue on a daily basis and the accrued portion will be treated as tax-
    exempt interest income for regular federal income tax purposes.  Upon sale
    or redemption, any gain realized that is in excess of the earned portion
    of original issue discount will be taxable as capital gain.  (See "Tax
    Status".)  The current value of an original issue discount bond reflects
    the present value of its face amount at maturity.  The market value tends
    to increase more slowly in early years and in greater increments as the
    Bonds approach maturity.  Of these original issue discount bonds, some of
    the aggregate principal amount of the Bonds in the Trust may be Zero
    Coupon Bonds.  (See "Description of Portfolios" in Part A.)  Zero Coupon
    Bonds do not provide for the payment of any current interest and provide
    for payment at maturity at face value unless sooner sold or redeemed.  The
    market value of Zero Coupon Bonds is subject to greater fluctuations than
    coupon bonds in response to changes in interest rates.  Zero Coupon Bonds
    generally are subject to redemption at compound accreted value based on
    par value at maturity.  Because the issuer is not obligated to make
    current interest payments, Zero Coupon Bonds may be less likely to be
    redeemed than coupon bonds issued at a similar interest rate, although
    certain zero coupon housing bonds may be subject to mandatory call
    provisions. 

               Some of the Bonds in the Trust may have been purchased at a
    "market" discount from par value at maturity.  This is because the coupon
    interest rates on the discount bonds at the time they were purchased and
    deposited in each Trust were lower than the current market interest rates
    for newly issued bonds of comparable rating and type.  At the time of
    issuance the discount bonds were for the most part issued at then current
    coupon interest rates.  The current returns (coupon interest income as a
    percentage of market price) of discount bonds will be lower than the
    current returns of comparably rated bonds of similar type newly issued at
    current interest rates because discount bonds tend to increase in market
    value as they approach maturity and the full principal amount becomes
    payable.  Gain on the disposition of a Bond purchased at a market discount
    generally will be treated as ordinary income, rather than capital gain, to
    the extent of accrued market discount.  A discount bond held to maturity
    will have a larger portion of its total return in the form of capital gain
    and less in the form of tax-exempt interest income than a comparable bond
    newly issued at current return, and a lower current market value than
    otherwise comparable bonds with a shorter term of maturity.  If interest
    rates rise, the value of discount bonds will decrease; and if interest
    rates decline, the value of discount bonds will increase.  The discount
    does not necessarily indicate a lack of market confidence in the issuer. 

    Insurance On The Bonds

               Each Bond in the Trust is insured by a municipal bond guaranty
    insurance policy, or in the case of Firemen's by a financial guaranty
    insurance policy, covering scheduled payment of principal and interest on
    such Bond.  See "Insurance" in Part A.  This insurance has been obtained
    either by the issuer of the Bond ("Pre-Insured Bonds"), or by the Sponsor
    ("Sponsor-Insured Bonds") with respect to Bonds which were not insured
    prior to their deposit in the Trusts.  The insurance policies on the Bonds
    are non-cancelable and will continue in force so long as the Bonds are
    outstanding and the insurers remain in business.  The insurance policies
    guarantee the timely payment of principal and interest on the Bonds but do
    not guarantee the market value of the Bonds or the value of the Units.  No
    representation is made herein as to any Bond insurer's ability to meet its
    obligations under a policy of insurance relating to any of the Bonds.  An
    insurance company that is required to pay interest and/or principal in
    respect of any Bond will succeed and be subrogated to the Trustee's right
    to collect such interest and/or principal from the issuer and to other
    related rights of the Trustee with respect to any such Bond.

               Sponsor-Insured Bonds.  For those Bonds which are not covered
    by an insurance policy obtained by the issuers of such Bonds, the Sponsor
    has obtained bond insurance from either Bond Investors Guaranty ("BIG"),
    Financial Guaranty Insurance Company ("Financial Guaranty"), Municipal
    Bond Insurance Association ("MBIA") or Municipal Bond Investors Assurance
    Corporation ("MBIA Corp.") in an effort to protect Certificateholders
    against nonpayment of principal and interest in respect of such Bonds (the
    "Sponsor-Insured Bonds").  The bond insurance on the Sponsor-Insured Bonds
    covers the Sponsor-Insured Bonds deposited in a Trust at the time that
    they are physically delivered to the Trustee (in the case of bearer bonds)
    or registered in the name of the Trustee or its nominee or delivered along
    with an assignment (in the case of registered bonds) or registered in the
    name of the Trustee or its nominee (in the case of bonds held in book-
    entry form).  Accordingly, although contracts to purchase Sponsor-Insured
    Bonds are not covered by the bond insurance obtained by the Sponsor, such
    Bonds will be insured when they are deposited in the Trust.  When
    selecting Bonds for a Trust prior to obtaining insurance thereon, the
    Sponsor considers the factors listed under "Portfolio", among others.  The
    insurers of the Sponsor-Insured Bonds apply their own standards in
    determining whether to insure the Sponsor-Insured Bonds.  To the extent
    that the standards of such insurers are more restrictive than those of the
    Sponsor, the Sponsor's investment criteria have been limited to the more
    restrictive standards. 
       
               Pre-Insured Bonds.  The Bonds which are insured under policies
    obtained by the Bond issuers are insured by AMBAC Indemnity Corporation
    ("AMBAC"), BIG, Financial Guaranty, Financial Security Assurance, Inc.
    ("Financial Security"), Firemen's Insurance Company of Newark, New Jersey
    ("Firemen's"), Industrial Indemnity Company ("IIC") (which operates the
    Health Industry Board Insurance Program ("HIBI Program")), MBIA, MBIA
    Corp., or United States Fidelity and Guaranty Company ("USF&G Company")
    (collectively, the "Insurance Companies").  The cost of this insurance is
    borne by the respective issuers of the Pre-Insured Bonds.  The percentage
    of the Portfolio insured by each Insurance Company, if any, is set forth
    under "Insurance" in Part A. 

               AMBAC is a Wisconsin-domiciled stock insurance company,
    regulated by the Insurance Department of the State of Wisconsin, and
    licensed to do business in 50 states, the District of Columbia and the
    Commonwealth of Puerto Rico, with admitted assets (unaudited) of
    approximately $2,060,000,000 and statutory capital (unaudited) of
    approximately $1,178,000,000 as of June 30, 1994.  Statutory capital
    consists of the statutory contingency reserve and policyholders' surplus
    of the insurance company.  AMBAC is a wholly owned subsidiary of AMBAC,
    Inc., a 100% publicly-held company.  
        
               As of the Evaluation Date, the claims-paying ability of AMBAC
    has been rated "AAA" by Standard & Poor's. 
       
               Financial Guaranty is a wholly-owned subsidiary of FGIC
    Corporation ("FGIC"), a Delaware holding company.  FGIC is a wholly-owned
    subsidiary of General Electric Capital Corporation ("GECC").  Neither FGIC
    nor GECC is obligated to pay the debts of or the claims against Financial
    Guaranty.  Financial Guaranty is domiciled in the State of New York and is
    subject to regulation by the State of New York Insurance Department.  As
    of June 30, 1994, the total capital and surplus of Financial Guaranty was
    approximately $850,000,000.  Financial Guaranty is currently authorized to
    write insurance in all 50 states and the District of Columbia.  
        
               As of the Evaluation Date, the claims-paying ability of
    Financial Guaranty has been rated "AAA" by Standard & Poor's. 
       
               Firemen's, which was incorporated in New Jersey in 1855, is a
    wholly-owned subsidiary of The Continental Corporation ("Continental") and
    a member of The Continental Insurance Companies, a group of property and
    casualty insurance companies.  It provides unconditional and non-
    cancelable insurance on industrial development revenue bonds.  As of
    December 31, 1993, Firemen's statutory surplus (audited) was $502,800,000.

               As of the Evaluation Date, the claims-paying ability of
    Firemen's has been rated "AA-" by Standard & Poor's. (See "Ratings" below
    in this Section).

               Financial Security is a monoline insurance company incorporated
    under the laws of the State of New York and is licensed, directly or
    indirectly through its subsidiaries, to engage in the financial guaranty
    insurance business in all 50 states, the District of Columbia, Puerto Rico
    and the United Kingdom.  Financial Security is a wholly-owned subsidiary
    of Financial Security Assurance Holdings Ltd., a New York Stock Exchange
    listed company which is in turn approximately 60.5% owned by U.S. WEST
    Capital Corporation ("U.S. WEST"), 7.6% by Fund American Enterprises
    Holdings, Inc., and 7.4% by the Tokio Marine and Fire Insurance Co., Ltd. 
    U.S. WEST is a subsidiary of U.S. WEST, Inc., which operates businesses
    involved in communications, data solutions, marketing services and capital
    assets, including the provision of telephone services in 14 states in the
    western and midwestern United States. 

               Pursuant to an intercompany agreement, liabilities on financial
    guaranty insurance written by Financial Security or either of its
    subsidiaries are reinsured among such companies on an agreed upon
    percentage substantially proportional to their respective capital surplus
    and reserves, subject to applicable statutory risk limitations.  In
    addition, Financial Security reinsures a portion of its liabilities under
    certain of its financial guaranty insurance policies with other reinsurers
    under various quota-share treaties and on a transaction-by-transaction
    basis.  Such reinsurance is utilized by Financial Security as a risk
    management device and to comply with certain statutory and rating agency
    requirements; it does not alter or limit Financial Security's obligations
    under any financial guaranty insurance policy.  As of June 30, 1994 total
    shareholder equity of Financial Security and its wholly-owned subsidiaries
    was (unaudited) $530,024,000 and total unearned premium reserves was
    (unaudited) $206,026,000.
        
               As of the Evaluation Date, Financial Security's claims-paying
    ability has been rated "AAA" by Standard & Poor's.
       
               On the original date of deposit, some of the Bonds in the
    Trusts may have been pre-insured pursuant to the HIBI Program operated by
    IIC.  Under the HIBI Program, all insurance written was pooled pursuant to
    a Reinsurance Participation Agreement among United States Fire Insurance
    Company, The North River Insurance Company, Westchester Fire Insurance
    Company, International Insurance Company and Industrial Indemnity Company
    (collectively, including IIC, the "Companies").  Under the Reinsurance
    Participation Agreement, each Company shared in the business produced by
    each participant in the pool on the following basis:  United States Fire
    Insurance Company--41%, IIC--18%, The North River Insurance Company--18%,
    Westchester Fire Insurance Company--18% and International Insurance
    Company--5%.  As of December 31, 1992, the Reinsurance Participation
    Agreement terminated.  As of January 1, 1993, each party to the HIBI
    Program remains liable on risks in force until their expiration.

               As of the Evaluation Date, the claims-paying ability of each of
    the Companies has been rated by Standard & Poor's as follows:  IIC has
    been rated A+; United States Fire Insurance Company, North River Insurance
    Company and Westchester Fire Insurance Company have each been rated A; and
    International Insurance Company has not been rated (see "Ratings" under
    "Insurance on the Bonds" in this Part B).

               IIC is a wholly-owned subsidiary of Industrial Indemnity
    Holdings, Inc.  Industrial Indemnity Holdings, Inc. is a wholly owned
    subsidiary of Talegen Holdings, Inc. (formerly Crum and Forster, Inc.) 
    For the six months ending June 1994, total policyholders' surplus of IIC
    was $248,743,124.  For the fiscal year ending December 31, 1992 IIC
    participated in a Reinsurance Participation Agreement with certain other
    Crum and Forster, Inc. companies.  As of January 1, 1993, Industrial
    Indemnity Company was not a participant in the Reinsurance Participation
    Agreement.

               As of the Evaluation Date, the claims-paying ability of IIC has
    been rated "A+" by Standard & Poor's.  As a result of this rating, the
    ratings of all Bonds in the Trusts insured by IIC, except pre-refunded
    bonds, are rated (see "Ratings" under "Insurance on the Bonds" in this
    Part B). 

               MBIA is an association of five insurance companies which joined
    together to insure severally (and not jointly) new issues of municipal
    bonds.  Each insurance company comprising Municipal Bond Insurance
    Association ("MBIA", also known as the "Association") will be severally
    and not jointly obligated under the MBIA policy in the following
    respective percentages:  The Aetna Casualty and Surety Company, 33%;
    Fireman's Fund Insurance Company, 30%; The Travelers Indemnity Company,
    15%; Aetna Insurance Company*, 12%; and The Continental Insurance
    Company, 10%.  As a several obligor, each such insurance company will be
    obligated only to the extent of its percentage of any claim under the MBIA
    policy and will not be obligated to pay any unpaid obligation of any other
    member of MBIA.  Each insurance company's participation is backed by all
    of its assets.  However, each insurance company is a multiline insurer
    involved in several lines of insurance other than municipal bond
    insurance, and the assets of each insurance company also secure all of its
    other insurance policy and surety bond obligations.

    *     Now known as Cigna Property and Casualty Company.
        
               The following table sets forth certain financial information
    with respect to the five insurance companies comprising MBIA.  The
    statistics, which have been furnished by MBIA, are as reported by the
    insurance companies to the New York State Insurance Department and are
    determined in accordance with statutory accounting principals.  No
    representation is made herein as to the accuracy or adequacy of such
    information or as to the absence of material adverse changes in such
    information subsequent to the date thereof.  In addition, these numbers
    are subject to revision by the New York State Insurance Department which,
    if revised, could either increase or decrease the amounts.

       
                       MUNICIPAL BOND INSURANCE ASSOCIATION
                    FIVE MEMBER COMPANIES' ASSETS, LIABILITIES 
                            AND POLICYHOLDERS' SURPLUS
                                AS OF JUNE 30, 1994
                                  (000's omitted)


                                        New York   New York    New York
                                        Statutory  Statutory   Policyholders'
                                        Assets     Liabilities Surplus       

    The Aetna Casualty & Surety Company $10,169,558  $ 8,299,548    $1,870,010
    Fireman's Fund Insurance Company      6,751,350    4,893,824     1,857,526
    The Travelers Indemnity Company      10,246,669    8,486,034     1,760,635
    Cigna Property and Casualty Company   4,992,242    4,924,356        67,886
      (Formerly Aetna Insurance Company)
    The Continental Insurance Company     2,712,535    2,351,467       361,068

       TOTAL                            $34,872,354  $28,955,229    $5,917,125



               MBIA Corp. is the principal operating subsidiary of MBIA Inc. 
    MBIA Inc. is not obligated to pay the debts of or claims against the
    Insurer.  MBIA Corp. is a limited liability corporation rather than a
    several liability association.  MBIA Corp. is domiciled, in the State of
    New York and licensed to do business in all 50 states, the District of
    Columbia and the Commonwealth of Puerto Rico.  MBIA Corp. is a separate
    and distinct entity from the Association.  MBIA Corp. has no liability to
    the bondholders for the obligations of the Association under the Policy.

               Effective December 31, 1989, MBIA Inc. acquired Bond Investors
    Group, Inc.  On January 5, 1990, MBIA acquired all of the outstanding
    stock of Bond Investors Group, Inc., the parent corporation of Bond
    Investors Guaranty Insurance Co. ("BIG").  Through a Reinsurance
    Agreement, BIG has ceded all of its net insured risks, as well as its
    unearned premium and contingency reserves, to MBIA and MBIA has reinsured
    BIG's net outstanding exposure.  As of March 31, 1994, MBIA Corp. had
    admitted assets of $3.2 billion (unaudited), total liabilities of $2.2
    billion (unaudited), and total capital and surplus of $998 billion
    prepared in accordance with statutory accounting principles prescribed or
    permitted by insurance regulatory authorities.
        
               As of the Evaluation Date, the claims-paying ability of MBIA
    and MBIA Corp., have been rated "AAA" by Standard & Poor's. 
        
               USF&G Company is the principal subsidiary of USF&G, a holding
    company engaged primarily in the insurance business.  USF&G Company,
    founded in 1896, is the twenty-fourth largest property/casualty insurer in
    the United States, based on net premiums written for the year ended
    December 31, 1993.  USF&G Company markets commercial and personal
    insurance products, concentrating on targeted market segments, through a
    distribution network of approximately 3,900 independent agents.  USF&G's
    life insurance subsidiary, F&G Life, markets life insurance and annuity
    products through a network of wholesalers, brokers and specialty marketing
    organizations.  USF&G Company accounted for $2.3 billion (or 95%) of
    USF&G's approximately $2.5 billion total premiums earned for the year
    ended December 31, 1993.  As of the Evaluation Date, the claims-paying
    ability of USF&G Company has been rated BBB- for senior secured
    obligations (see "Ratings" under "Insurance on the Bonds" in this Part B).

               Ratings.  As of the Date of Deposit for each of the respective
    Trusts, Standard & Poor's had rated the claims-paying ability of each of
    the above insurance companies "AAA" and had rated each of the Bonds in the
    Portfolio "AAA" because the insurance companies had insured the Bonds. 
    The assignment of such "AAA" ratings was due to Standard & Poor's
    assessment of the creditworthiness of the insurance companies and their
    ability to pay claims on their policies of insurance.  Subsequently, the
    rating of the claims-paying ability of the insurer of an underlying Bond
    may cease to be rated or may be downgraded which may result in a
    downgrading of the rating of the Units in the Trust.  For a discussion of
    the rating of the claims-paying ability of each of the Bond insurers see
    "Insurance On The Bonds".  For a list of Bond Ratings as of the Evaluation
    Date see the "Portfolio" in Part A of this Prospectus.  For a discussion
    of the rating assigned to the Units of the Trusts, see "the Trust" in
    Part A of this Prospectus.  The percentage of each Trust portfolio insured
    by each insurance company, if any, is set forth under "Insurance" in
    Part A. 
        
               The foregoing information relating to the above insurance
    companies is from published documents and other public sources and/or
    information provided by such insurance companies.  No representation is
    made herein as to the accuracy or adequacy of such information or as to
    the absence of material adverse changes in such information subsequent to
    the dates thereof, but the Sponsor is not aware that the information
    herein is inaccurate or incomplete. 


                                  PUBLIC OFFERING

    Offering Price

               The secondary market Public Offering Price per Unit is
    computed by adding to the aggregate bid price of the Bonds in the Trust
    divided by the number of Units outstanding, an amount based on the
    applicable sales charge times the aggregate offering price of the Bonds
    (see "Public Offering Price" in Part A for the applicable sales charge for
    the Trust).  A proportionate share of accrued interest on the Bonds to the
    expected date of settlement for the Units is added to the Public Offering
    Price.  Accrued interest is the accumulated and unpaid interest on a Bond
    from the last day on which interest was paid and is accounted for daily by
    the Trust at the initial daily rate set forth under "Summary of Essential
    Information" in Part A of this Prospectus.  This daily rate is net of
    estimated fees and expenses.  The Public Offering Price can vary on a
    daily basis from the amount stated in Part A in accordance with
    fluctuations in the prices of the Bonds and the price to be paid by each
    investor will be computed as of the date the Units are purchased.  The
    aggregate bid price evaluation of the Bonds is determined in the manner
    set forth under "Trustee Redemption."

               The Evaluator may obtain current bid or offering prices for
    the Bonds from investment dealers or brokers (including the Sponsor) that
    customarily deal in tax-exempt obligations or from any other reporting
    service or source of information which the Evaluator deems appropriate. 

    Accrued Interest

               An amount of accrued interest which represents accumulated
    unpaid or uncollected interest on a Bond from the last day on which
    interest was paid thereon will be added to the Public Offering Price and
    paid by the Certificateholder at the time Units are purchased.  Since the
    Trust normally receives the interest on Bonds twice a year and the
    interest on the Bonds in the Trust is accrued on a daily basis (net of
    estimated fees and expenses), the Trust will always have an amount of
    interest accrued but not actually received and distributed to Certificate-
    holders.  A Certificateholder will not recover his proportionate share of
    accrued interest until the Units are sold or redeemed, or the Trust is
    terminated.  At that time, the Certificateholder will receive his
    proportionate share of the accrued interest computed to the settlement
    date in the case of a sale or termination and to the date of tender in the
    case of redemption. 

    Employee Discounts

               Employees and their immediate families of Bear, Stearns & Co.
    Inc. and of any underwriter of a Trust, pursuant to employee benefit
    arrangements, may purchase Units of a Trust at a price equal to the
    offering side evaluation of the underlying securities in a Trust during
    the initial offering period and at the bid side thereafter, divided by the
    number of Units outstanding plus a reduced charge of $10.00 per Unit. 
    Such arrangements result in less selling effort and selling expenses than
    sales to employee groups of other companies.  Resales or transfers of
    Units purchased under the employee benefit arrangements may only be made
    through the Sponsor's secondary market, so long as it is being maintained.


    Distribution Of Units

               Certain banks and thrifts will make Units of the Trust
    available to their customers on an agency basis.  A portion of the sales
    charge paid by their customers is retained by or remitted to the banks. 
    Under the Glass-Steagall Act, banks are prohibited from underwriting
    Units; however, the Glass-Steagall Act does permit certain agency
    transactions and the banking regulators have indicated that these
    particular agency transactions are permitted under such Act.  In addition,
    state securities laws on this issue may differ from the interpretations of
    federal law expressed herein and banks and financial institutions may be
    required to register as dealers pursuant to state law.

               The Sponsor intends to qualify the Units for sale in
    substantially all States through the Underwriters and through dealers who
    are members of the National Association of Securities Dealers, Inc.  Units
    may be sold to dealers at prices which represent a concession of up to (a)
    4% of the Public Offering Price for the Insured Municipal Securities Trust
    Series or (b) $25.00 per unit for the Insured Municipal Securities Trust
    Discount Series, subject to the Sponsor's right to change the dealers'
    concession from time to time.  In addition, for transactions of 1,000,000
    Units or more, the Sponsor intends to negotiate the applicable sales
    charge and such charge will be disclosed to any such purchaser.  Such
    Units may then be distributed to the public by the dealers at the Public
    Offering Price then in effect.  The Sponsor reserves the right to reject,
    in whole or in part, any order for the purchase of Units.  The Sponsor
    reserves the right to change the discounts from time to time.

    Sponsor's Profits

               The Sponsor will receive a gross commission on all Units sold
    in the secondary market equal to the applicable sales charge on each
    transaction.  (See "Offering Price".)  In addition, in maintaining a
    market for the Units (see "Sponsor Repurchase") the Sponsor will realize
    profits or sustain losses in the amount of any difference between the
    price at which it buys Units and the price at which it resells such Units.


               Participants in the Total Reinvestment Plan can designate a
    broker as the recipient of a dealer concession (see "Total Reinvestment
    Plan"). 

    Comparison of Public Offering Price, Sponsor's
      Repurchase Price And Redemption Price

               The secondary market Public Offering Price of Units will be
    determined on the basis of the current bid prices of the Bonds in the
    Trust, plus the applicable sales charge.  The value at which Units may be
    resold in the Secondary Market or redeemed will be determined on the basis
    of the current bid prices of the Bonds without any sales charge.  On the
    Evaluation Date, the Public Offering Price and the Sponsor's initial
    Repurchase Price per Unit (each based on the bid side evaluation of the
    Bonds in the Trust) each exceeded the Redemption Price and the Sponsor's
    secondary market Repurchase Price per Unit (based upon the current bid
    side evaluation of the Bonds in the Trust) by the amounts shown under
    "Summary of Essential Information" in Part A of this Prospectus.  For this
    reason, among others (including fluctuations in the market prices of such
    Bonds and the fact that the Public Offering Price includes the applicable
    sales charge), the amount realized by a Certificateholder upon any
    redemption of Sponsor repurchase of Units may be less than the price paid
    for such Units. 


              ESTIMATED LONG TERM RETURN AND ESTIMATED CURRENT RETURN


               The rate of return on an investment in Units of each Trust is
    measured in terms of "Estimated Current Return" and "Estimated Long Term
    Return".

               Estimated Long Term Return is calculated by:  (1) computing
    the yield to maturity or to an earlier call date (whichever results in a
    lower yield) for each Bond in a Trust's portfolio in accordance with
    accepted bond practices, which practices take into account not only the
    interest payable on the Bond but also the amortization of premiums or
    accretion of discounts, if any; (2) calculating the average of the yields
    for the Bonds in each Trust's portfolio by weighing each Bond's yield by
    the market value of the Bond and by the amount of time remaining to the
    date to which the Bond is priced (thus creating an average yield for the
    portfolio of each Trust); and (3) reducing the average yield for the
    portfolio of each Trust in order to reflect estimated fees and expenses of
    that Trust and the maximum sales charge paid by Unitholders.  The
    resulting Estimated Long Term Return represents a measure of the return to
    Unitholders earned over the estimated life of each Trust.  The Estimated
    Long Term Return as of the day prior to the Evaluation Date is stated for
    the Trust under "Summary of Essential Information" in Part A.

               Estimated Current Return is computed by dividing the Estimated
    Net Annual Interest Income per Unit by the Public Offering Price per Unit. 
    In contrast to the Estimated Long Term Return, the Estimated Current
    Return does not take into account the amortization of premium or accretion
    of discount, if any, on the Bonds in the portfolios of each Trust. 
    Moreover, because interest rates on Bonds purchased at a premium are
    generally higher than current interest rates on newly issued bonds of a
    similar type with comparable rating, the Estimated Current Return per Unit
    may be affected adversely if such Bonds are redeemed prior to their
    maturity.  On the day prior to the Evaluation Date, the Estimated Net
    Annual Interest Income per Unit divided by the Public Offering Price
    resulted in the Estimated Current Return stated for each Trust under
    "Summary of Essential Information" in Part A.

               The Estimated Net Annual Interest Income per Unit of each
    Trust will vary with changes in the fees and expenses of the Trustee and
    the Evaluator applicable to each Trust and with the redemption, maturity,
    sale or other disposition of the Bonds in each Trust.  The Public Offering
    Price will vary with changes in the bid prices of the Bonds.  Therefore,
    there is no assurance that the present Estimated Current Return or
    Estimated Long Term Return will be realized in the future.

               A schedule of cash flow projections is available from the
    Sponsor upon request.


                           RIGHTS OF CERTIFICATEHOLDERS

    Certificates

               Ownership of Units of the Trust is evidenced by registered
    Certificates executed by the Trustee and the Sponsor.  Certificates may be
    issued in denominations of one or more Units and will bear appropriate
    notations on their faces indicating which plan of distribution has been
    selected by the Certificateholder.  Certificates are transferable by
    presentation and surrender to the Trustee properly endorsed and/or
    accompanied by a written instrument or instruments of transfer.  Although
    no such charge is presently made or contemplated, the Trustee may require
    a Certificateholder to pay $2.00 for each Certificate reissued or
    transferred and any governmental charge that may be imposed in connection
    with each such transfer or interchange.  Mutilated, destroyed, stolen or
    lost Certificates will be replaced upon delivery of satisfactory indemnity
    and payment of expenses incurred. 

    Interest And Principal Distributions

               Interest received by the Trust is credited by the Trustee to
    an Interest Account and a deduction is made to reimburse the Trustee
    without interest for any amounts previously advanced.  Proceeds
    representing principal received from the maturity, redemption, sale or
    other disposition of the Bonds are credited to a Principal Account. 

               Distributions to each Certificateholder from the Interest
    Account are computed as of the close of business on each Record Date for
    the following Payment Date and consist of an amount substantially equal to
    one-twelfth, one-half or all of such Certificateholder's pro rata share of
    the Estimated Net Annual Interest Income in the Interest Account,
    depending upon the applicable plan of distribution.  Distributions from
    the Principal Account (other than amounts representing failed contracts,
    as previously discussed) will be computed as of each semi-annual Record
    Date, and will be made to the Certificateholders on or shortly after the
    next semi-annual Payment Date.  Proceeds representing principal received
    from the disposition of any of the Bonds between a Record Date and a
    Payment Date which are not used for redemptions of Units will be held in
    the Principal Account and not distributed until the second succeeding
    semi-annual Payment Date.  No distributions will be made to Certificate-
    holders electing to participate in the Total Reinvestment Plan.  Persons
    who purchase Units between a Record Date and a Payment Date will receive
    their first distribution on the second Payment Date after such purchase. 

               Because interest payments are not received by the Trust at a
    constant rate throughout the year, interest distributions may be more or
    less than the amount credited to the Interest Account as of a given Record
    Date.  For the purpose of minimizing fluctuations in the distributions
    from the Interest Account, the Trustee will advance sufficient funds,
    without interest, as may be necessary to provide interest distributions of
    approximately equal amounts.  All funds in respect of the Bonds received
    and held by the Trustee prior to distribution to Certificateholders may be
    of benefit to the Trustee and do not bear interest to Certificateholders. 

               As of the first day of each month, the Trustee will deduct
    from the Interest Account, and, to the extent funds are not sufficient
    therein, from the Principal Account, amounts necessary to pay the expenses
    of the Trust (as determined on the basis set forth under "Trust Expenses
    and Charges").  The Trustee also may withdraw from said accounts such
    amounts, if any, as it deems necessary to establish a reserve for any
    applicable taxes or other governmental charges that may be payable out of
    the Trust.  Amounts so withdrawn shall not be considered a part of the
    Trust's assets until such time as the Trustee shall return all or any part
    of such amounts to the appropriate accounts.  In addition, the Trustee may
    withdraw from the Interest and Principal Accounts such amounts as may be
    necessary to cover purchases of Replacement Bonds and redemptions of Units
    by the Trustee. 

               The estimated monthly, semi-annual or annual interest
    distribution per Unit will initially be in the amount shown under Summary
    of Essential Information and will change and may be reduced as Bonds
    mature or are redeemed, exchanged or sold, or as expenses of the Trust
    fluctuate.  No distribution need be made from the Principal Account until
    the balance therein is an amount sufficient to distribute $1.00 per Unit. 

    Distribution Elections

               Interest is distributed monthly, semi-annually or annually,
    depending upon the distribution plan applicable to the Unit purchased. 
    Record Dates are the first day of each month for monthly distributions,
    the first day of each June and December for semi-annual distributions and
    the first day of each December for annual distributions.  Payment Dates
    will be the fifteenth day of each month following the respective Record
    Dates. 

               Certificateholders purchasing Units in the secondary market
    will initially receive distributions in accordance with the election of
    the prior owner.  Every October each Certificateholder may change his
    distribution election by notifying the Trustee in writing of such change
    between October 1 and November 1 of each year.  (Certificateholders
    deciding to change their election should contact the Trustee by calling
    the number listed on the back cover hereof for information regarding the
    procedures that must be followed in connection with this written
    notification of the change of election.)  Failure to notify the Trustee on
    or before November 1 of each year will result in a continuation of the
    plan for the following 12 months.

    Records

               The Trustee shall furnish Certificateholders in connection
    with each distribution a statement of the amount of interest, if any, and
    the amount of other receipts, if any, which are being distributed,
    expressed in each case as a dollar amount per Unit.  Within a reasonable
    time after the end of each calendar year the Trustee will furnish to each
    person who at any time during the calendar year was a Certificateholder of
    record, a statement showing (a) as to the Interest Account:  interest
    received (including amounts representing interest received upon any
    disposition of Bonds and earned original issue discount, if any), amounts
    paid for purchases of Replacement Bonds and redemptions of Units, if any,
    deductions for applicable taxes and fees and expenses of the Trust, and
    the balance remaining after such distributions and deductions, expressed
    both as a total dollar amount and as a dollar amount representing the pro
    rata share of each Unit outstanding on the last business day of such
    calendar year; (b) as to the Principal Account:  the dates of disposition
    of any Bonds and the net proceeds received therefrom (including any
    unearned original issue discount but excluding any portion representing
    accrued interest), deductions for payments of applicable taxes and fees
    and expenses of the Trust, amounts paid for purchases of Replacement Bonds
    and redemptions of Units, if any, and the balance remaining after such
    distributions and deductions, expressed both as a total dollar amount and
    as a dollar amount representing the pro rata share of each Unit
    outstanding on the last business day of such calendar year; (c) a list of
    the Bonds held and the number of Units outstanding on the last business
    day of such calendar year; (d) the Redemption Price per Unit based upon
    the last computation thereof made such calendar year; and (e) amounts
    actually distributed to Certificateholders during such calendar year from
    the Interest and Principal Accounts, separately stated, expressed both as
    total dollar amounts representing the pro rata share of each Unit
    outstanding on the last business day of such calendar year. 

               The Trustee shall keep available for inspection by Certifi-
    cateholders at all reasonable times during usual business hours, books of
    record and account of its transactions as Trustee, including records of
    the names and addresses of Certificateholders, Certificates issued or
    held, a current list of Bonds in the portfolio and a copy of the Trust
    Agreement. 


                                    TAX STATUS


               All Bonds acquired by the Trust were accompanied by copies of
    opinions of bond counsel to the issuing governmental authorities given at
    the time of original delivery of the Bonds to the effect that the interest
    thereon is exempt from regular federal income tax.  Such interest may,
    however, be subject to the federal corporate alternative minimum tax and
    to state and local taxes.  Neither the Sponsor nor the Trustee nor their
    respective counsel has made any review of the proceedings relating to the
    issuance of the Bonds or the bases for such opinion and express no opinion
    as to these matters, and neither the Trustee nor the Sponsor nor their
    respective counsel has made an independent examination or verification
    that the federal income tax status of the Bonds has not been altered since
    the time of the original delivery of those opinions. 

               The Revenue Reconciliation Act of 1993 ("P.L. 103-66") was
    recently enacted.  P.L. 103-66 increases maximum marginal income tax rates
    for individuals and corporations (generally effective for taxable years
    beginning after December 31, 1992), extends the authority to issue certain
    categories of tax-exempt bonds (qualified small issue bonds and qualified
    mortgage bonds), limits the availability of capital gain treatment for
    tax-exempt bonds purchased at a market discount, increases the amount of
    Social Security benefits subject to tax (effective for taxable years
    beginning after December 31, 1993) and makes a variety of other changes. 
    Prospective investors are urged to consult their own tax advisors as to
    the effect of P.L. 103-66 on an investment in Units.

               In rendering the opinion set forth below, counsel has examined
    the Agreement, the final form of Prospectus dated the date hereof (the
    "Prospectus") and the documents referred to therein, among others, and has
    relied on the validity of said documents and the accuracy and completeness
    of the facts set forth therein. 

               In the opinion of Battle Fowler, counsel for the Sponsor,
    under existing law:

          The Trust is not an association taxable as a corporation for federal
    income tax purposes under the Internal Revenue Code of 1986 (the "Code"),
    and income received by the Trust that consists of interest excludable from
    federal gross income under the Code will be excludable from the federal
    gross income of the Certificateholders of the Trust. 

          Each Certificateholder will be considered the owner of a pro rata
    portion of the Trust under Section 676(a) of the Code.  Thus, each Cer-
    tificateholder will be considered to have received his pro rata share of
    Bond interest when it is received by the Trust, and the net income
    distributable to Certificateholders that is exempt from federal income tax
    when received by the Trust will constitute tax-exempt income when received
    by the Certificateholders. 

          Gain (other than any earned original issue discount) realized on a
    sale or redemption of the Bonds or on a sale of a Unit is, however,
    includable in gross income for federal income tax purposes, generally as
    capital gain, although gain on the disposition of a Bond or a Unit
    purchased at a market discount generally will be treated as ordinary
    income, rather than capital gain, to the extent of accrued market
    discount.  (It should be noted in this connection that such gain does not
    include any amounts received in respect of accrued interest.)  Such gain
    may be long or short-term depending on the facts and circumstances. 
    Capital losses are deductible to the extent of capital gains; in addition,
    up to $3,000 of capital losses of non-corporate Certificateholders may be
    deducted against ordinary income.  Capital assets acquired on or after
    January 1, 1988 must be held for more than one year to qualify for long-
    term capital gain treatment.

          Each Certificateholder will realize taxable gain or loss when the
    Trust disposes of a Bond (whether by sale, exchange, redemption or payment
    at maturity), as if the Certificateholder had directly disposed of his pro
    rata share of such Bond.  The gain or loss is measured by the difference
    between (i) the tax cost of such pro rata share and (ii) the amount
    received therefor.  For this purpose, a Certificateholder's per Unit tax
    cost for each Bond is determined by allocating the total tax cost of each
    Unit among all the Bonds held in the Trust (in accordance with the portion
    of the Trust comprised by each Bond).  In order to determine the amount of
    taxable gain or loss, the Certificateholder's amount received is similarly
    allocated at that time.  The Certificateholder may exclude from the amount
    received any amounts that represent accrued interest or the earned portion
    of any original issue discount but may not exclude amounts attributable to
    market discount.  Thus, when a Bond is disposed of by the Trust at a gain,
    taxable gain will equal the difference between (i) the amount received and
    (ii) the amount paid plus any original issue discount (limited, in the
    case of Bonds issued after June 8, 1980, to the portion earned from the
    date of acquisition to the date of disposition).  Gain on the disposition
    of a Bond purchased at a market discount generally will be treated as
    ordinary income, rather than capital gain, to the extent of accrued market
    discount.  No deduction is allowed for the amortization of bond premium on
    tax-exempt bonds such as the Bonds in computing regular federal income
    tax. 

          Discount generally accrues based on the principle of compounding of
    accrued interest, not on a straight-line or ratable method, with the
    result that the amount of earned original issue discount is less in the
    earlier years and more in the later years of a bond term.  The tax basis
    of a discount bond is increased by the amount of accrued, tax-exempt
    original issue discount thus determined.  This method of calculation will
    produce higher capital gains (or lower losses) to a Certificateholder, as
    compared to the results produced by the straight-line method of accounting
    for original issue discount, upon an early disposition of a Bond by the
    Trust or of a Unit by a Certificateholder.

          A Certificateholder may also realize taxable income or loss when a
    Unit is sold or redeemed.  The amount received is allocated among all the
    Bonds in the Trust in the same manner as when the Trust disposes of Bonds
    and the Certificateholder may exclude accrued interest and the earned
    portion of any original issue discount (but not amounts attributable to
    market discount).  The return of a Certificateholder's tax cost is
    otherwise a tax-free return of capital. 
       
          A portion of social security benefits is includable in gross income
    for taxpayers whose "modified adjusted gross income" combined with a
    portion of their benefits exceeds a base amount.  The base amount is
    $25,000 for an individual, $32,000 for a married couple filing a joint
    return and zero for married persons filing separate returns.  Interest on
    tax-exempt bonds is to be added to adjusted gross income for purposes of
    computing the amount of Social Security benefits that are includable in
    gross income and determining whether an individual's income exceeds the
    base amount above which a portion of the benefits would be subject to tax. 
    For taxable years beginning after December 31, 1993, the amount of Social
    Security benefits subject to tax has been increased.
        
          Corporate Certificateholders are required to include in federal
    corporate alternative minimum taxable income 75 percent of the amount by
    which the adjusted current earnings (which will include tax-exempt
    interest) of the corporation exceeds the alternative minimum taxable
    income (determined without this item).  Further, interest on the Bonds is
    includable in a 0.12% additional corporate minimum tax imposed by the
    Superfund Amendments and Reauthorization Act of 1986 for taxable years
    beginning before January 1, 1996.  In addition, in certain cases, Subchap-
    ter S corporations with accumulated earnings and profits from Subchapter C
    years will be subject to a minimum tax on excess "passive investment
    income" which includes tax-exempt interest.

          Any proceeds received pursuant to the terms of the insurance on the
    Bonds that represent maturing interest on defaulted obligations will be
    excludable from federal gross income if, and to the same extent that, such
    interest would have been so excludable if paid by the issuers of such
    defaulted obligations. 

          The Trust is not subject to the New York State Franchise Tax on
    Business Corporations or the New York City General Corporation Tax.  For a
    Certificateholder who is a New York resident, however, a pro rata portion
    of all or part of the income of the Trust will be treated as the income of
    the Certificateholder under the income tax laws of the State and City of
    New York.  Similar treatment may apply in other states. 

               The exemption of interest on municipal obligations for federal
    income tax purposes does not necessarily result in exemption under the
    income tax laws of any state or political subdivision.  In general,
    municipal bond interest exempt from federal income tax is taxable income
    to residents of the State or City of New York under the tax laws of those
    jurisdictions unless the bonds are issued by the State of New York or one
    of its political subdivisions or by the Commonwealth of Puerto Rico or one
    of its political subdivisions.  For corporations doing business in New
    York State, interest earned on state and municipal obligations that are
    exempt from federal income tax, including obligations of New York State,
    its political subdivisions and instrumentalities, must be included in
    calculating New York State and New York City entire net income for
    purposes of calculating New York State and New York City franchise
    (income) tax.  The laws of the several states and local taxing authorities
    vary with respect to the taxation of such obligations and each Certifi-
    cateholder is advised to consult his own tax advisor as to the tax
    consequences of his Certificates under state and local tax laws. 

               In the case of Bonds that are industrial revenue bonds
    ("IRBs") or certain types of private activity bonds, the opinions of bond
    counsel to the respective issuing authorities indicate that interest on
    such Bonds is exempt from regular federal income tax.  However, interest
    on such Bonds will not be exempt from regular federal income tax for any
    period during which such Bonds are held by a "substantial user" of the
    facilities financed by the proceeds of such Bonds or by a "related person"
    thereof within the meaning of the Code.  Therefore, interest on any such
    Bonds allocable to a Certificateholder who is such a "substantial user" or
    "related person" thereof will not be tax-exempt.  Furthermore, in the case
    of IRBs that qualify for the "small issue" exemption, the "small issue"
    exemption will not be available or will be lost if, at any time during the
    three-year period beginning on the later of the date the facilities are
    placed in service or the date of issue, all outstanding tax-exempt IRBs,
    together with a proportionate share of any present issue, of an owner or
    principal user (or related person) of the facilities exceeds $40,000,000. 
    In the case of IRBs issued under the $10,000,000 "small issue" exemption,
    interest on such IRBs will become taxable if the face amount of the IRBs
    plus certain capital expenditures exceeds $10,000,000.

               In addition, a Bond can lose its tax-exempt status as a result
    of other subsequent but unforeseeable events such as prohibited
    "arbitrage" activities by the issuer of the Bond or the failure of the
    Bond to continue to satisfy the conditions required for the exemption of
    interest thereon from regular federal income tax.  No investigation has
    been made as to the current or future owners or users of the facilities
    financed by the Bonds, the amount of such persons' outstanding tax-exempt
    IRBs, or the facilities themselves, and no assurance can be given that
    future events will not affect the tax-exempt status of the Bonds. 
    Investors should consult their tax advisors for advice with respect to the
    effect of these provisions on their particular tax situation.

               Interest on indebtedness incurred or continued to purchase or
    carry the Units is not deductible for regular federal income tax purposes. 
    However, such interest is deductible for New York State and New York City
    income tax purposes by corporations that are required to include interest
    on the Bonds in New York State and New York City entire net income for
    purposes of calculating the New York State and New York City franchise
    (income) taxes.  In addition, under rules used by the Internal Revenue
    Service for determining when borrowed funds are considered used for the
    purpose of purchasing or carrying particular assets, the purchase of Units
    may be considered to have been made with borrowed funds even though the
    borrowed funds are not directly traceable to the purchase of Units.  Also,
    in the case of certain financial institutions that acquire Units, in
    general no deduction is allowed for interest expense allocable to the
    Units. 

               From time to time proposals have been introduced before
    Congress to restrict or eliminate the federal income tax exemption for
    interest on debt obligations similar to the Bonds in the Trust, and it can
    be expected that similar proposals may be introduced in the future.

               In a 1988 decision (South Carolina v. Baker), the U.S. Supreme
    Court held that the federal government may constitutionally require states
    to register bonds they issue and subject the interest on such bonds to
    federal income tax if not registered, and that there is no constitutional
    prohibition against the federal government's taxing the interest earned on
    state or other municipal bonds.  The Supreme Court decision affirms the
    authority of the federal government to regulate and control bonds such as
    the Bonds in the Trust and to tax interest on such bonds in the future. 
    The decision does not, however, affect the current exemption from taxation
    of the interest earned on the Bonds in the Trust in accordance with Sec-
    tion 103 of the Code. 

               The opinions of bond counsel or special tax counsel to the
    issuing governmental authorities to the effect that interest on the Bonds
    is exempt from regular federal income tax may be limited to law existing
    at the time the Bonds were issued, and may not apply to the extent that
    future changes in law, regulations or interpretations affect such Bonds. 
    Investors are advised to consult their own tax advisors for advice with
    respect to the effect of any legislative changes.


                                     LIQUIDITY

    Sponsor Repurchase

               The Sponsor, although not obligated to do so, intends to
    maintain a secondary market for the Units and continuously to offer to
    repurchase the Units.  The Sponsor's secondary market repurchase price,
    after the initial public offering is completed, will be based on the
    aggregate bid price of the Bonds in the Trust portfolio, determined by the
    Evaluator on a daily basis, and will be the same as the redemption price. 
    The aggregate bid price is determined by the Evaluator on a daily basis
    and completed on the basis set forth under "Trustee Redemption".  Certifi-
    cateholders who wish to dispose of their Units should inquire of the
    Sponsor as to current market prices prior to making a tender for
    redemption.  The Sponsor may discontinue repurchase of Units if the supply
    of Units exceeds demand, or for other business reasons.  The date of
    repurchase is deemed to be the date on which Certificates representing
    Units are physically received in proper form by Bear, Stearns & Co. Inc.,
    245 Park Avenue, New York, NY 10167.  Units received after 4 P.M., New
    York Time, will be deemed to have been repurchased on the next business
    day.  In the event a market is not maintained for the Units, a Certifi-
    cateholder may be able to dispose of Units only by tendering them to the
    Trustee for redemption. 

               Prospectuses relating to certain other bond trusts indicate an
    intention by the respective Sponsor, subject to change, to repurchase
    units on the basis of a price higher than the bid prices of the bonds in
    the trusts.  Consequently, depending on the prices actually paid, the
    secondary market repurchase price of other trusts may be computed on a
    somewhat more favorable basis than the repurchase price offered by the
    Sponsor for units of this Trust, although in all bond trusts, the purchase
    price of a unit depends primarily on the value of the bonds in the trust
    portfolio. 

               Units purchased by the Sponsor in the secondary market may be
    re-offered for sale by the Sponsor at a price based on the aggregate bid
    price of the Bonds in the Trust plus the applicable sales charge (see
    "Public Offering Price" in Part A) plus net accrued interest.  Any Units
    that are purchased by the Sponsor in the secondary market also may be
    redeemed by the Sponsor if it determines such redemption to be in its best
    interest. 

               The Sponsor may, under certain circumstances, as a service to
    Certificateholders, elect to purchase any Units tendered to the Trustee
    for redemption (see "Trustee Redemption").  Factors which the Sponsor will
    consider in making a determination will include the number of Units of all
    Trusts which it has in inventory, its estimate of the salability and the
    time required to sell such Units and general market conditions.  For
    example, if in order to meet redemptions of Units the Trustee must dispose
    of Bonds, and if such disposition cannot be made by the redemption date
    (seven calendar days after tender), the Sponsor may elect to purchase such
    Units.  Such purchase shall be made by payment to the Certificateholder
    not later than the close of business on the redemption date of an amount
    equal to the Redemption Price on the date of tender. 

    Trustee Redemption

               Units may also be tendered to the Trustee for redemption at
    its corporate trust office as set forth in Part A of this Prospectus, upon
    proper delivery of Certificates representing such Units and payment of any
    relevant tax.  At the present time there are no specific taxes related to
    the redemption of Units.  No redemption fee will be charged by the Sponsor
    or the Trustee.  Units redeemed by the Trustee will be cancelled. 

               Certificates representing Units to be redeemed must be
    delivered to the Trustee and must be properly endorsed or accompanied by
    proper instruments of transfer with signature guaranteed (or by providing
    satisfactory indemnity, as in the case of lost, stolen or mutilated
    Certificates).  Thus, redemptions of Units cannot be effected until
    Certificates representing such Units have been delivered by the person
    seeking redemption.  (See "Certificates".)  Certificateholders must sign
    exactly as their names appear on the faces of their Certificates.  In
    certain instances the Trustee may require additional documents such as,
    but not limited to, trust instruments, certificates of death, appointments
    as executor or administrator or certificates of corporate authority. 

               Within seven calendar days following a tender for redemption,
    or, if such seventh day is not a business day, on the first business day
    prior thereto, the Certificateholder will be entitled to receive in cash
    an amount for each Unit tendered equal to the Redemption Price per Unit
    computed as of the Evaluation Time set forth under "Summary of Essential
    Information" in Part A on the date of tender.  The "date of tender" is
    deemed to be the date on which Units are received by the Trustee, except
    that with respect to Units received after the close of trading on the New
    York Stock Exchange, the date of tender is the next day on which such
    Exchange is open for trading, and such Units will be deemed to have been
    tendered to the Trustee on such day for redemption at the Redemption Price
    computed on that day. 

               Accrued interest paid on redemption shall be withdrawn from
    the Interest Account, or, if the balance therein is insufficient, from the
    Principal Account.  All other amounts paid on redemption shall be
    withdrawn from the Principal Account.  The Trustee is empowered to sell
    Bonds in order to make funds available for redemptions.  Such sales, if
    required, could result in a sale of Bonds by the Trustee at a loss.  To
    the extent Bonds are sold, the size and diversity of the Trust will be
    reduced. 

               The Redemption Price per Unit is the pro rata share of each
    Unit in the Trust determined by the Trustee on the basis of (i) the cash
    on hand in the Trust or moneys in the process of being collected, (ii) the
    value of the Bonds in the Trust based on the bid prices of such Bonds and
    (iii) interest accrued thereon, less (a) amounts representing taxes or
    other governmental charges payable out of the Trust, (b) the accrued
    expenses of the Trust and (c) cash allocated for the distribution to Cer-
    tificateholders of record as of the business day prior to the evaluation
    being made.  The Evaluator may determine the value of the Bonds in the
    Trust (1) on the basis of current bid prices of the Bonds obtained from
    dealers or brokers who customarily deal in bonds comparable to those held
    by the Trust, (2) on the basis of bid prices for bonds comparable to any
    Bonds for which bid prices are not available, (3) by determining the value
    of the Bonds by appraisal, or (4) by any combination of the above.  The
    Evaluator will determine the aggregate current bid price evaluation of the
    Bonds in the Trust, taking into account the market value of the Bonds
    insured under the Bond Insurance Policy, in the manner described as set
    forth under "Public Offering--Offering Price".  Insurance does not
    guarantee the market value of the Bonds or the Units, and while Bond
    insurance represents an element of market value in regard to insured
    Bonds, its exact effect, if any, on market value cannot be predicted. 

               The Trustee is irrevocably authorized in its discretion, if
    the Sponsor does not elect to purchase a Unit tendered for redemption or
    if the Sponsor tenders a Unit for redemption, in lieu of redeeming such
    Unit, to sell such Unit in the over-the-counter market for the account of
    the tendering Certificateholder at prices which will return to the Cer-
    tificateholder an amount in cash, net after deducting brokerage
    commissions, transfer taxes and other charges, equal to or in excess of
    the Redemption Price for such Unit.  The Trustee will pay the net proceeds
    of any such sale to the Certificateholder on the day he would otherwise be
    entitled to receive payment of the Redemption Price. 

               The Trustee reserves the right to suspend the right of
    redemption and to postpone the date of payment of the Redemption Price per
    Unit for any period during which the New York Stock Exchange is closed,
    other than customary weekend and holiday closings, or trading on that
    Exchange is restricted or during which (as determined by the Securities
    and Exchange Commission) an emergency exists as a result of which disposal
    or evaluation of the Bonds is not reasonably practicable, or for such
    other periods as the Securities and Exchange Commission may by order
    permit.  The Trustee and the Sponsor is not liable to any person or in any
    way for any loss or damage which may result from any such suspension or
    postponement. 

               A Certificateholder who wishes to dispose of his Units should
    inquire of his bank or broker in order to determine if there is a current
    secondary market price in excess of the Redemption Price. 


                              TOTAL REINVESTMENT PLAN


               Under the Total Reinvestment Plan (the "Plan"), semi-annual
    and annual Certificateholders (except Texas residents*) may elect to have
    all interest and principal distributions, if any, with respect to their
    Units reinvested either in units of various series of "Insured Municipal
    Securities Trust" or "Municipal Securities Trust" which will have been
    created shortly before each semi-annual or annual Payment Date (a "Primary
    Series") or, if units of a Primary Series are not available, in units of a
    previously formed series of the Trust which have been repurchased by the
    Sponsor in the secondary market or which constitute a portion of the Units
    of the Trust not sold by the Sponsor prior to such Payment Date (a
    "Secondary Series") (Primary Series and Secondary Series are hereafter
    collectively referred to as "Available Series").  Series of "Municipal
    Securities Trustee" do not have insurance.  The first interest
    distribution to Certificateholders cannot be reinvested unless such
    distribution is scheduled for June 15 or December 15 in the case of semi-
    annual Certificateholders or December 15 in the case of annual Certifi-
    cateholders (each such date being referred to herein as the "Plan
    Reinvestment Date"). 


    *     Texas residents may elect to participate in the "Total Reinvestment
          Plan for Texas Residents" hereinafter described.



               Under the Plan (subject to compliance with applicable blue sky
    laws), fractional units ("Plan Units") will be purchased from the Sponsor
    at a price equal to the aggregate offering price per Unit of the bonds in
    the Available Series portfolio during the initial offering of the
    Available Series or at the aggregate bid price per Unit of the Available
    Series if its initial offering has been completed, plus a sales charge
    equal to 3.627% of the net amount invested in such bonds or 3-1/2% of the
    Reinvestment Price per Plan Unit, plus accrued interest, divided by one
    hundred (the "Reinvestment Price per Plan Unit").  All Plan Units will be
    sold at this reduced sales charge of 3-1/2% in comparison to the regular
    sales charge on primary and secondary market sales of Units in any series
    of "Municipal Securities Trust".  Participants in the Plan will have the
    opportunity to designate, in the Authorization Form for the Plan, the name
    of a broker to whom the Sponsor will allocate a sales commission of 1-1/2%
    of the Reinvestment Price per Plan Unit, payable out of the 3-1/2% sales
    charge.  If no such designation is made, the Sponsor will retain the sales
    commission. 

               Under the Plan, the entire amount of a participant's income
    and principal distributions will be reinvested.  For example, a Certifi-
    cateholder who is entitled to receive $130.50 interest income from the
    Trust would acquire 13.05 Plan Units assuming that the Reinvestment Price
    per Plan Unit, plus accrued interest, approximated $10 (Ten Dollars). 

               A semi-annual or annual Certificateholder may join the Plan at
    the time he invests in Units of the Trust or any time thereafter by
    delivering to the Trustee an Authorization Form which is available from
    brokers, any Underwriter of the Units or the Sponsor.  In order that
    distributions may be reinvested on a particular Plan Reinvestment Date,
    the Authorization Form must be received by the Trustee not later than the
    15th day of the month preceding such Date.  Authorization Forms not
    received in time for a particular Plan Reinvestment Date will be valid
    only for the second succeeding Plan Reinvestment Date.  Similarly, a
    participant may withdraw from the program at any time by notifying the
    Trustee (see below).  However, if written confirmation of withdrawal is
    not given to the Trustee prior to a particular distribution, the
    participant will be deemed to have elected to participate in the Plan with
    respect to that particular distribution and his withdrawal would become
    effective for the next succeeding distribution. 

               Once delivered to the Trustee, an Authorization Form will
    constitute a valid election to participate in the Plan with respect to
    Units purchased in the Trust (and with respect to Plan Units purchased
    with the distributions from the Units purchased in the Trust) for each
    subsequent distribution so long as the Certificateholder continues to
    participate in the Plan.  However, if an Available Series should
    materially differ from the Trust in the opinion of the Sponsor, the
    authorization will be voided and participants will be provided with both a
    notice of the material change and a new Authorization Form which would
    have to be returned to the Trustee before the Certificateholder would
    again be able to participate in the Plan.  The Sponsor anticipates that a
    material difference which would result in a voided authorization would
    include such facts as the inclusion of bonds in the Available Series
    portfolio the interest income on which was not exempt from all federal
    income tax, or the inclusion of bonds which were not rated "A" or better
    by Standard & Poor's Corporation or Moody's Investors Service, Inc. on the
    date such bonds were initially deposited in the Available Series
    portfolio. 

               The Sponsor has the option at any time to use units of a
    Secondary Series to fulfill the requirements of the Plan in the event
    units of a Primary Series are not available either because a Primary
    Series is not then in existence or because the registration statement
    relating thereto is not declared effective in sufficient time to
    distribute final prospectuses to Plan participants (see below).  It should
    be noted that there is no assurance that the quality and diversification
    of the Bonds in any Available Series or the estimated current return
    thereon will be similar to that of this Trust. 

               It is the Sponsor's intention that Plan Units will be offered
    on or about each semi-annual and annual Record Date for determining who is
    eligible to receive distributions on the related Payment Date.  Such
    Record Dates are June 1 and December 1 of each year for semi-annual Cer-
    tificateholders, and December 1 of each year for annual Certificate-
    holders.  On each Record Date the Sponsor will send a current Prospectus
    relating to the Available Series being offered for the next Plan
    Reinvestment Date along with a letter which reminds each participant that
    Plan Units are being purchased for him as part of the Plan unless he
    notifies the Trustee in writing by that Plan Reinvestment Date that he no
    longer wishes to participate in the Plan.  In the event a Primary Series
    has not been declared effective in sufficient time to distribute a final
    Prospectus relating thereto and there is no Secondary Series as to which a
    registration statement is currently effective, it is the Sponsor's
    intention to suspend the Plan and distribute to each participant his
    regular semi-annual or annual distribution.  If the Plan is so suspended,
    it will resume in effect with the next Plan Reinvestment Date assuming
    units of an Available Series are then being offered. 

               To aid a participant who might desire to withdraw either from
    the Plan or from a particular distribution, the Trustee has established a
    toll free number (see "Summary of Essential Information" in Part A) for
    participants to use for notification of withdrawal, which must be
    confirmed in writing prior to the Plan Reinvestment Date.  Should the
    Trustee be so notified, it will make the appropriate cash disbursement. 
    Unless the withdrawing participant specifically indicates in his written
    confirmation that (a) he wishes to withdraw from the Plan for that
    particular distribution only, or (b) he wishes to withdraw from the Plan
    for less than all units of each series of "Municipal Securities Trust" or
    "Insured Municipal Securities Trust" which he might then own (and
    specifically identifies which series are to continue in the Plan), he will
    be deemed to have withdrawn completely from the Plan in all respects. 
    Once a participant withdraws completely, he will only be allowed to again
    participate in the Plan by submitting a new Authorization Form.  A sale or
    redemption of a portion of a participant's Plan Units will not constitute
    a withdrawal from the Plan with respect to the remaining Plan Units owned
    by such participant. 

               Unless a Certificateholder notifies the Trustee in writing to
    the contrary, each semi-annual and annual Certificateholder who has
    acquired Plan Units will be deemed to have elected the semi-annual and
    annual plan of distribution, respectively, and to participate in the Plan
    with respect to distributions made in connection with such Plan Units. 
    (Should the Available Series from which Plan Units are purchased for the
    account of an annual Certificateholder fail to have an annual distribution
    plan, such Certificateholder will be deemed to have elected the semi-
    annual plan of distribution, and to participate in the Plan with respect
    to distributions made, in connection with such Plan Units.)  A participant
    who subsequently desires to have distributions made with respect to Plan
    Units delivered to him in cash may withdraw from the Plan with respect to
    such Plan Units and remain in the Plan with respect to units acquired
    other than through the Plan.  Assuming a participant has his distributions
    made with respect to Plan Units reinvested, all such distributions will be
    accumulated with distributions generated from the Units of the Trust used
    to purchase such additional Plan Units.  However, distributions related to
    units in other series of "Municipal Securities Trust" will not be
    accumulated with the foregoing distributions for Plan purchases.  Thus, if
    a person owns units in more than one series of "Municipal Securities
    Trust" (which are not the result of purchases under the Plan),
    distributions with respect thereto will not be aggregated for purchases
    under the Plan. 

               Although not obligated to do so, the Sponsor intends to
    maintain a market for the Plan Units and continuously to offer to purchase
    Plan Units at prices based upon the aggregate offering price of the Bonds
    in the Available Series portfolio during the initial offering of the
    Available Series, or at the aggregate bid price of the Bonds of the
    Available Series after its initial offering has been completed.  The
    Sponsor may discontinue such purchases at any time.  The aggregate bid
    price of the underlying bonds may be expected to be less than the
    aggregate offering price.  In the event that a market is not maintained
    for Plan Units, a participant desiring to dispose of his Plan Units may be
    able to do so only by tendering such Plan Units to the Trustee for
    redemption at the Redemption Price of the full units in the Available
    Series corresponding to such Plan Units, which is based upon the aggregate
    bid price of the underlying bonds as described in the "Insured Municipal
    Securities Trust" Prospectus for the Available Series in question.  If a
    participant wishes to dispose of his Plan Units, he should inquire of the
    Sponsor as to current market prices prior to making a tender for
    redemption to the Trustee. 

               Any participant may tender his Plan Units for redemption to
    the Available Series Trust.  Participants may redeem Plan Units by making
    a written request to the Trustee, at the address listed in the "Summary of
    Essential Information" in Part A, on the Redemption Form supplied by the
    Trustee.  The redemption price per Plan Unit will be determined as set
    forth in the "Insured Municipal Securities Trust" Prospectus of the
    Available Series from which such Plan Unit was purchased following receipt
    of the request and adjusted to reflect the fact that it relates to a Plan
    Unit.  There is no charge for the redemption of Plan Units. 

               The Trust Agreement requires that the Trustee notify the
    Sponsor of any tender of Plan Units for redemption.  So long as the
    Sponsor is maintaining a bid in the secondary market, the Sponsor will
    purchase any Plan Units tendered to the Trustee for redemption by making
    payment therefor to the Certificateholder in an amount not less than the
    redemption price for such Plan Units on the date of tender not later than
    the day on which such Plan Units otherwise would have been redeemed by the
    Trustee. 

               Participants in the Plan will not receive individual
    certificates for their Plan Units unless the amount of Plan Units
    accumulated represents $1,000 principal amount of bonds underlying such
    Units and, in such case, a written request for certificates is made to the
    Trustee.  All Plan Units will be accounted for by the Trustee on a book
    entry system.  Each time Plan Units are purchased under the Plan, a
    participant will receive a confirmation stating his cost, number of Units
    purchased and estimated current return.  Questions regarding a
    participant's statements should be directed to the Trustee by calling the
    Trustee at the number set forth under "Summary of Essential Information"
    in Part A of this Prospectus.

               All expenses relating to the operation of the Plan will be
    borne by the Sponsor.  The Sponsor and the Trustee reserve the right to
    suspend, modify or terminate the Plan at any time for any reason,
    including the right to suspend the Plan if the Sponsor is unable or
    unwilling to establish a Primary Series or is unable to provide Secondary
    Series Units.  All participants will receive notice of any such
    suspension, modification or termination. 

    Total Reinvestment Plan For Texas Residents

               Except as specifically provided under this section, and unless
    the context otherwise requires, all provisions and definitions contained
    under the heading "Total Reinvestment Plan" shall be applicable to the
    Total Reinvestment Plan for Texas Residents ("Texas Plan"). 

               Semi-annual and annual Certificateholders of the Trust who are
    residents of Texas have the option prior to any semi-annual or annual
    distribution to affirmatively elect to reinvest that distribution,
    including both interest and principal, if any, in an Available Series. 

               A resident of Texas who is a semi-annual or annual Certifi-
    cateholder may join the Texas Plan for any particular semi-annual or
    annual distribution by delivering to the Trustee an Authorization Form For
    Texas Residents ("Texas Authorization Form") specifically mentioning the
    date of the particular semi-annual or annual distribution he wishes to
    reinvest. On or about each semi-annual or annual Record Date, Texas
    Authorization Forms shall be sent by the Trustee to every Certificate-
    holder who, according to the Trustee's records, is a resident of Texas. 
    In the event that the Sponsor suspends the Plan or the Texas Plan no Texas
    Authorization Forms shall be sent.  In order that distributions may be
    reinvested on a particular Plan Reinvestment Date, the Texas Authorization
    Form must be received by the Trustee on or before such Date.  Texas
    Authorization Forms not received in time for the Plan Reinvestment Date
    will be deemed void.  A participant who delivers a Texas Authorization
    Form to the Trustee may thereafter withdraw said authorization by
    notifying the Trustee at its toll free telephone number prior to a Plan
    Reinvestment Date.  Such notification of withdrawal must be confirmed in
    writing prior to the Plan Reinvestment Date.  Under no circumstances shall
    a Texas Authorization Form be provided or accepted by the Trustee which
    provides for the reinvestment of distributions for more than one Plan
    Reinvestment Date. 

               On or about each semi-annual and annual Record Date, the
    Sponsor will send a current Prospectus relating to the Available Series
    being offered on the next Plan Reinvestment Date along with a letter
    incorporating a Texas Authorization Form which specifies the funds
    available for reinvestment, reminds each participant that no Plan Units
    will be purchased for him unless the Texas Authorization Form is received
    by the Trustee on or before that particular Plan Reinvestment Date, and
    states that the Texas Authorization Form is valid only for that particular
    semi-annual or annual distribution.  If the Available Series should
    materially differ from the Trust, the participant will be provided with a
    notice of the material change and a new Texas Authorization Form which
    would have to be returned to the Trustee before the Certificateholder
    would again be able to participate in the Plan. 

               Each semi-annual and annual Certificateholder who has acquired
    Plan Units will be deemed to have elected the semi-annual and annual plan
    of distribution, respectively, with respect to such Units, but such Cer-
    tificateholder will not be deemed to participate in the Plan for any
    particular distribution unless and until he delivers to the Trustee a
    Texas Authorization Form pertaining to those Plan Units.  (Should the
    Available Series from which Plan Units are purchased for the account of an
    annual Certificateholder fail to have an annual distribution plan, such
    Certificateholder will be deemed to have elected the semi-annual plan of
    distribution, and to participate in the Plan with respect to distributions
    made in connection with such Plan Units.)


                               TRUST ADMINISTRATION

    Portfolio Supervision

               Except for the purchase of Replacement Bonds or as discussed
    herein, the acquisition of any Bonds for the Trust other than Bonds
    initially deposited by the Sponsor is prohibited.  Although it is the
    Sponsor's and Trustee's intention not to dispose of Bonds insured pursuant
    to the Bond Insurance in the event of default, nevertheless, the Sponsor
    may direct the Trustee to dispose of Bonds upon (i) default in payment of
    principal or interest on such Bonds, (ii) institution of certain legal
    proceedings with respect to the issuers of such Bonds, (iii) default under
    other documents adversely affecting debt service on such Bonds,
    (iv) default in payment of principal or interest on other obligations of
    the same issuer or guarantor, (v) with respect to revenue Bonds, decline
    in revenues and income of any facility or project below the estimated
    levels calculated by proper officials charged with the construction or
    operation of such facility or project or (vi) decline in price or the
    occurrence of other market or credit factors that in the opinion of the
    Sponsor would make the retention of such Bonds in the Trust detrimental to
    the interests of the Certificateholders.  If a default in the payment of
    principal or interest on any of the Bonds occurs and if the Sponsor fails
    to instruct the Trustee to sell or hold such Bonds, the Trust Agreement
    provides that the Trustee may sell such Bonds.  The Trustee shall not be
    liable for any depreciation or loss by reason of any sale of bonds or by
    reason of the failure of the Sponsor to give directions to the Trustee. 

               The Sponsor is authorized by the Trust Agreement to direct the
    Trustee to accept or reject certain plans for the refunding or refinancing
    of any of the Bonds.  Any bonds received in exchange or substitution will
    be held by the Trustee subject to the terms and conditions of the
    Agreement to the same extent as the Bonds originally deposited.  Within
    five days after such deposit, notice of such exchange and deposit shall be
    given by the Trustee to each Certificateholder registered on the books of
    the Trustee, including an identification of the Bonds eliminated and the
    Bonds substituted therefor. 

    Trust Agreement, Amendment And Termination

               The Trust Agreement may be amended by the Trustee, the Sponsor
    and the Evaluator without the consent of any of the Certificateholders: 
    (1) to cure any ambiguity or to correct or supplement any provision which
    may be defective or inconsistent; (2) to change any provision thereof as
    may be required by the Securities and Exchange Commission or any successor
    governmental agency; or (3) to make such other provisions in regard to
    matters arising thereunder as shall not adversely affect the interests of
    the Certificateholders. 

               The Trust Agreement may also be amended in any respect, or
    performance of any of the provisions thereof may be waived, with the
    consent of the holders of Certificates evidencing 66-2/3% of the Units
    then outstanding for the purpose of modifying the rights of Certificate-
    holders; provided that no such amendment or waiver shall reduce any Cer-
    tificateholder's interest in the Trust without his consent or reduce the
    percentage of Units required to consent to any such amendment or waiver
    without the consent of the holders of all Certificates.  The Trust
    Agreement may not be amended, without the consent of the holders of all
    Certificates then outstanding, to increase the number of Units issuable or
    to permit the acquisition of any bonds in addition to or in substitution
    for those initially deposited in the Trust, except in accordance with the
    provisions of the Trust Agreement.  The Trustee shall promptly notify Cer-
    tificateholders, in writing, of the substance of any such amendment. 

               The Trust Agreement provides that the Trust shall terminate
    upon the maturity, redemption or other disposition, as the case may be, of
    the last of the Bonds held in the Trust but in no event is it to continue
    beyond the end of the calendar year preceding the fiftieth anniversary of
    the execution of the Trust Agreement.  If the value of the Trust shall be
    less than the minimum amount set forth under "Summary of Essential
    Information" in Part A, the Trustee may, in its discretion, and shall when
    so directed by the Sponsor, terminate the Trust.  The Trust may also be
    terminated at any time with the consent of the holders of Certificates
    representing 100% of the Units then outstanding.  In the event of
    termination, written notice thereof will be sent by the Trustee to all
    Certificateholders.  Within a reasonable period after termination, the
    Trustee must sell any Bond remaining in the Trust, and, after paying all
    expenses and charges incurred by the Trust, distribute to each Certifi-
    cateholder, upon surrender for cancellation of his Certificate for Units,
    his pro rata share of the Interest and Principal Accounts. 

    The Sponsor

               The Sponsor, Bear, Stearns & Co. Inc., a Delaware corporation,
    is engaged in the underwriting, investment banking and brokerage business
    and is a member of the National Association of Securities Dealers, Inc.
    and all principal securities and commodities exchanges, including the New
    York Stock Exchange, the American Stock Exchange, the Midwest Stock
    Exchange and the Pacific Stock Exchange.  Bear Stearns maintains its
    principal business offices at 245 Park Avenue, New York, New York 10167
    and, since its reorganization from a partnership to a corporation in
    October, 1985 has been a wholly-owned subsidiary of The Bear Stearns
    Companies Inc.  Bear Stearns, through its predecessor entities, has been
    engaged in the investment banking and brokerage business since 1923.  Bear
    Stearns is the sponsor for numerous series of unit investment trusts,
    including:  A Corporate Trust, Series 1 (and Subsequent Series); New York
    Municipal Trust, Series 1 (and Subsequent Series), Discount and Zero
    Coupon Fund, 1st Series (and Subsequent Series); Municipal Securities
    Trust, Series 1 (and Subsequent Series), 1st Discount Series (and
    Subsequent Series); High Income Series 1 (and Subsequent Series); Multi-
    State Series 1 (and Subsequent Series); Insured Municipal Securities
    Trust, Series 1-4 (Multiplier Portfolio), Series 1 (and Subsequent
    Series), 5th Discount Series (and Subsequent Series), Navigator Series
    (and Subsequent Series); Mortgage Securities Trust, CMO Series 1 (and
    Subsequent Series) and Equity Securities Trust, Series 1, Signature
    Series, Gabelli Communications Income Trust (and Subsequent Series).  The
    information included herein is only for the purpose of informing investors
    as to the financial responsibility of the Sponsor and its ability to carry
    out its contractual obligations. 

               The Sponsor is liable for the performance of its obligations
    arising from its responsibilities under the Trust Agreement, but will be
    under no liability to Certificateholders for taking any action, or
    refraining from taking any action, in good faith pursuant to the Trust
    Agreement, or for errors in judgment except in cases of its own willful
    misfeasance, bad faith, gross negligence or reckless disregard of its
    obligations and duties. 

               The Sponsor may resign at any time by delivering to the
    Trustee an instrument of resignation executed by the Sponsor. 

               If at any time the Sponsor shall resign or fail to perform any
    of its duties under the Trust Agreement or becomes incapable of acting or
    becomes bankrupt or its affairs are taken over by public authorities, then
    the Trustee may either (a) appoint a successor Sponsor; (b) terminate the
    Trust Agreement and liquidate the Trust; or (c) continue to act as Trustee
    without terminating the Trust Agreement.  Any successor Sponsor appointed
    by the Trustee shall be satisfactory to the Trustee and, at the time of
    appointment, shall have a net worth of at least $1,000,000. 

    The Trustee
       
               For certain of the Trusts as set forth in the "Summary of
    Essential Information" in Part A, the Trustee is United States Trust
    Company of New York, with its principal place of business at 770 Broadway,
    New York, New York 10003.  United States Trust Company of New York has,
    since its establishment in 1853, engaged primarily in the management of
    trust and agency accounts for individuals and corporations.  The Trustee
    is a member of the New York Clearing House Association and is subject to
    supervision and examination by the Superintendent of Banks of the State of
    New York, the Federal Deposit Insurance Corporation and the Board of
    Governors of the Federal Reserve System.
        
               For certain other Trusts as set forth in the "Summary of
    Essential Information" in Part A, the Trustee is The Bank of New York, a
    trust company organized under the laws of New York, having its offices at
    101 Barclay Street, New York, New York 10286 (1-800-431-8002).  The Bank
    of New York is subject to supervision and examination by the
    Superintendent of Banks of the State of New York and the Board of
    Governors of the Federal Reserve System, and its deposits are insured by
    the Federal Deposit Insurance Corporation to the extent permitted by law. 
    The Trustee must be a banking corporation organized under the laws of the
    United States or any state which is authorized under such laws to exercise
    corporate trust powers and must have at all times an aggregate capital,
    surplus and undivided profits of not less than $5,000,000.  The duties of
    the Trustee are primarily ministerial in nature.  The Trustee did not
    participate in the selection of Securities for the portfolio of the Trust.

               The Trustee shall not be liable or responsible in any way for
    taking any action, or for refraining from taking any action, in good faith
    pursuant to the Trust Agreement, or for errors in judgment; or for any
    disposition of any moneys, bonds or Certificates in accordance with the
    Trust Agreement, except in cases of its own willful misfeasance, bad
    faith, gross negligence or reckless disregard of its obligations and
    duties; provided, however, that the Trustee shall not in any event be
    liable or responsible for any evaluation made by the Evaluator.  In
    addition, the Trustee shall not be liable for any taxes or other
    governmental charges imposed upon or in respect of the Bonds or the Trust
    which it may be required to pay under current or future law of the United
    States or any other taxing authority having jurisdiction.  The Trustee
    shall not be liable for depreciation or loss incurred by reason of the
    sale by the Trustee of any of the Bonds pursuant to the Trust Agreement. 

               For further information relating to the responsibilities of
    the Trustee under the Trust Agreement, reference is made to the material
    set forth under "Rights of Certificateholders".

               The Trustee may resign by executing an instrument in writing
    and filing the same with the Sponsor, and mailing a copy of a notice of
    resignation to all Certificateholders.  In such an event the Sponsor is
    obligated to appoint a successor Trustee as soon as possible.  In
    addition, if the Trustee becomes incapable of acting or becomes bankrupt
    or its affairs are taken over by public authorities, the Sponsor may
    remove the Trustee and appoint a successor as provided in the Trust
    Agreement.  Notice of such removal and appointment shall be mailed to each
    Certificateholder by the Sponsor.  If upon resignation of the Trustee no
    successor has been appointed and has accepted the appointment within
    thirty days after notification, the retiring Trustee may apply to a court
    of competent jurisdiction for the appointment of a successor.  The
    resignation or removal of the Trustee becomes effective only when the
    successor Trustee accepts its appointment as such or when a court of
    competent jurisdiction appoints a successor Trustee. Upon execution of a
    written acceptance of such appointment by such successor Trustee, all the
    rights, powers, duties and obligations of the original Trustee shall vest
    in the successor. 

               Any corporation into which the Trustee may be merged or with
    which it may be consolidated, or any corporation resulting from any merger
    or consolidation to which the Trustee shall be a party, shall be the
    successor Trustee.  The Trustee must always be a banking corporation
    organized under the laws of the United States or any State and have at all
    times an aggregate capital, surplus and undivided profits of not less than
    $2,500,000. 

    The Evaluator

               The Evaluator is Kenny S&P Evaluation Services, a division of
    Kenny Information Systems, Inc. with main offices located at 65 Broadway,
    New York, New York 10006.  The Evaluator is a wholly-owned subsidiary of
    McGraw-Hill Inc.  The Evaluator is a registered investment advisor and
    also provides financial information services. 

               The Trustee, the Sponsor and the Certificateholders may rely
    on any evaluation furnished by the Evaluator and shall have no
    responsibility for the accuracy thereof.  Determinations by the Evaluator
    under the Trust Agreement shall be made in good faith upon the basis of
    the best information available to it, provided, however, that the
    Evaluator shall be under no liability to the Trustee, the Sponsor or Cer-
    tificateholders for errors in judgment, except in cases of its own willful
    misfeasance, bad faith, gross negligence or reckless disregard of its
    obligations and duties. 

               The Evaluator may resign or may be removed by the Sponsor and
    Trustee, and the Sponsor and the Trustee are to use their best efforts to
    appoint a satisfactory successor. Such resignation or removal shall become
    effective upon the acceptance of appointment by the successor Evaluator. 
    If upon resignation of the Evaluator no successor has accepted appointment
    within thirty days after notice of resignation, the Evaluator may apply to
    a court of competent jurisdiction for the appointment of a successor. 


                            TRUST EXPENSES AND CHARGES


               At no cost to the Trust, the Sponsor has borne all the
    expenses of creating and establishing the Trust, including the cost of
    initial preparation and execution of the Trust Agreement, registration of
    the Trust and the Units under the Investment Company Act of 1940 and the
    Securities Act of 1933, the premiums on the Sponsor-Insured Bonds, initial
    preparation and printing of the Certificates, the fees of the Evaluator
    during the initial public offering, legal expenses, advertising and
    selling expenses, expenses of the Trustee including, but not limited to,
    an amount equal to interest accrued on certain "when issued" bonds since
    the date of settlement for the Units, initial fees and other out-of-pocket
    expenses. 

               The Sponsor will not charge the Trust a fee for its services
    as such.  (See "Sponsor's Profits".)

               The Sponsor will receive for portfolio supervisory services to
    the Trust an Annual Fee in the amount set forth under "Summary of
    Essential Information" in Part A of this Prospectus.  The Sponsor's fee
    may exceed the actual cost of providing portfolio supervisory services for
    this Trust, but at no time will the total amount received for portfolio
    supervisory services rendered to all series of the Municipal Securities
    Trust in any calendar year exceed the aggregate cost to the Sponsor of
    supplying such services in such year. (See "Portfolio Supervision".)

               The Trustee will receive for its ordinary recurring services
    to the Trust an annual fee in the amount set forth under "Summary of
    Essential Information" in Part A of this Prospectus.  For a discussion of
    the services performed by the Trustee pursuant to its obligations under
    the Trust Agreement, see "Trust Administration" and "Rights of Certifi-
    cateholders".

               The Evaluator will receive, for each daily evaluation of the
    Bonds in the Trust after the initial public offering is completed, a fee
    in the amount set forth under "Summary of Essential Information" in Part A
    of this Prospectus. 

               The Trustee's and Evaluator's fees are payable monthly as of
    the Record Date from the Interest Account to the extent funds are
    available and then from the Principal Account.  Both fees may be increased
    without approval of the Certificateholders by amounts not exceeding
    proportionate increases in consumer prices for services as measured by the
    United States Department of Labor's Consumer Price Index entitled "All
    Services Less Rent".

               The following additional charges are or may be incurred by the
    Trust:  all expenses (including counsel fees) of the Trustee incurred and
    advances made in connection with its activities under the Trust Agreement,
    including the expenses and costs of any action undertaken by the Trustee
    to protect the Trust and the rights and interests of the Certificate-
    holders; fees of the Trustee for any extraordinary services performed
    under the Trust Agreement; indemnification of the Trustee for any loss or
    liability accruing to it without gross negligence, bad faith or willful
    misconduct on its part, arising out of or in connection with its
    acceptance or administration of the Trust; indemnification of the Sponsor
    for any losses, liabilities and expenses incurred in acting as Sponsor of
    the Trust without gross negligence, bad faith or willful misconduct on its
    part; and all taxes and other governmental charges imposed upon the Bonds
    or any part of the Trust (no such taxes or charges are being levied, made
    or, to the knowledge of the Sponsor, contemplated).  The above expenses,
    including the Trustee's fees, when paid by or owing to the Trustee are
    secured by a first lien on the Trust.  In addition, the Trustee is
    empowered to sell Bonds in order to make funds available to pay all
    expenses. 

               The accounts of the Trust shall be audited not less than
    annually by independent public accountants selected by the Sponsor.  So
    long as the Sponsor maintains a secondary market, the Sponsor will bear
    any audit expense which exceeds 50 cents per Unit.  Certificateholders
    covered by the audit during the year may receive a copy of the audited
    financial upon request. 


                      EXCHANGE PRIVILEGE AND CONVERSION OFFER

    Exchange Privilege

               Certificateholders may elect to exchange any or all of their
    Units of these Trusts for Units of one or more of any available series of
    Insured Municipal Securities Trust, Municipal Securities Trust, New York
    Municipal Trust, Mortgage Securities Trust, A Corporate Trust or Equity
    Securities Trust (upon receipt by the Equity Securities Trust of an
    appropriate exemptive order from the Securities & Exchange Commission)
    (the "Exchange Trusts") at a reduced sales charge as set forth below. 
    Under the Exchange Privilege, the Sponsor's repurchase price of the Units
    being surrendered, and only after the initial offering period has been
    completed, will be based on the aggregate bid price of the Bonds in the
    particular Trust portfolio.  Units in an Exchange Trust then will be sold
    to the Certificateholder at a price based on the aggregate offer price of
    the Bonds in the Exchange Trust portfolio (or for Units of Equity
    Securities Trust, based on the market value of the underlying securities
    in the Equity Trust portfolio) during the initial public offering period
    of the Exchange Trust; or, based on the aggregate bid price of the Bonds
    in the Exchange Trust portfolio if its initial public offering has been
    completed, plus accrued interest (or for Units of Equity Securities Trust,
    based on the market value of the underlying securities in the Equity Trust
    portfolio) and a reduced sales charge as set forth below.

               Except for Certificateholders who wish to exercise the
    Exchange Privilege within the first five months of their purchase of Units
    of Trust, the sales charge applicable to the purchase of units of an
    Exchange Trust shall be $15 per unit (or per 1,000 units for the Mortgage
    Securities Trust or per 100 Units for the Equity Securities Trust)
    (approximately 1.5% of the price of each Exchange Trust unit (or 1,000
    Units for the Mortgage Securities Trust or per 100 Units for the Equity
    Securities Trust)).  For Certificateholders who wish to exercise the
    Exchange Privilege within the first five months of their purchase of Units
    of Trust, the sales charge applicable to the purchase of units of an
    Exchange Trust shall be the greater of (i) $15 per unit (or per 1,000
    Units for the Mortgage Securities Trust or per 100 Units for the Equity
    Securities Trust), or (ii) an amount which when coupled with the sales
    charge paid by the Certificateholder upon his original purchase of Units
    of the Trust at least equals the sales charge applicable in the direct
    purchase of units of an Exchange Trust.  The Exchange Privilege is subject
    to the following conditions:

               (1)  The Sponsor must be maintaining a secondary market in
          both the Units of the Trust held by the Certificateholder and the
          Units of the available Exchange Trust.  While the Sponsor has
          indicated its intention to maintain a market in the Units of all
          Trusts sponsored by it, the Sponsor is under no obligation to
          continue to maintain a secondary market and therefore there is no
          assurance that the Exchange Privilege will be available to a
          Certificateholder at any specific time in the future.  At the time
          of the Certificateholder's election to participate in the Exchange
          Privilege, there also must be Units of the Exchange Trust available
          for sale, either under the initial primary distribution or in the
          Sponsor's secondary market.

               (2)  Exchanges will be effected in whole units only.  Any
          excess proceeds from the Units surrendered for exchange will be
          remitted and the selling Certificateholder will not be permitted to
          advance any new funds in order to complete an exchange.  Units of
          the Mortgage Securities Trust may only be acquired in blocks of
          1,000 Units.  Units of the Equity Securities Trust may only be
          acquired in blocks of 100 Units.

               (3)  The Sponsor reserves the right to suspend, modify or
          terminate the Exchange Privilege.  The Sponsor will provide
          Certificateholders of the Trust with 60 days' prior written notice
          of any termination or material amendment to the Exchange Privilege,
          provided that, no notice need be given if (i) the only material
          effect of an amendment is to reduce or eliminate the sales charge
          payable at the time of the exchange, to add one or more series of
          the Trust eligible for the Exchange Privilege or to delete a series
          which has been terminated from eligibility for the Exchange
          Privilege, (ii) there is a suspension of the redemption of units of
          an Exchange Trust under Section 22(e) of the Investment Company Act
          of 1940, or (iii) an Exchange Trust temporarily delays or ceases the
          sale of its units because it is unable to invest amounts effectively
          in accordance with its investment objectives, policies and
          restrictions.  During the 60 day notice period prior to the
          termination or material amendment of the Exchange Privilege
          described above, the Sponsor will continue to maintain a secondary
          market in the units of all Exchange Trusts that could be acquired by
          the affected Certificateholders.  Certificateholders may, during
          this 60 day period, exercise the Exchange Privilege in accordance
          with its terms then in effect.  In the event the Exchange Privilege
          is not available to a Certificateholder at the time he wishes to
          exercise it, the Certificateholder will immediately be notified and
          no action will be taken with respect to his Units without further
          instructions from the Certificateholder.

               To exercise the Exchange Privilege, a Certificateholder should
    notify the Sponsor of his desire to exercise his Exchange Privilege.  If
    Units of a designated, outstanding series of an Exchange Trust are at the
    time available for sale and such Units may lawfully be sold in the state
    in which the Certificateholder is a resident, the Certificateholder will
    be provided with a current prospectus or prospectuses relating to each
    Exchange Trust in which he indicates an interest.  He may then select the
    Trust or Trusts into which he desires to invest the proceeds from his sale
    of Units.  The exchange transaction will operate in a manner essentially
    identical to a secondary market transaction except that units may be
    purchased at a reduced sales charge.

               Example:  Assume that after the initial public offering has
    been completed, a Certificateholder has five units of a Trust with a
    current value of $700 per unit which he has held for more than 5 months
    and the Certificateholder wishes to exchange the proceeds for units of a
    secondary market Exchange Trust with a current price of $725 per unit. 
    The proceeds from the Certificateholder's original units will aggregate
    $3,500.  Since only whole units of an Exchange Trust may be purchased
    under the Exchange Privilege, the Certificateholder would be able to
    acquire four units (or 4,000 Units of the Mortgage Securities Trust or 400
    Units of the Equity Securities Trust) for a total cost of $2,960 ($2,900
    for unit and $60 for the sales charge).  The remaining $540 would be
    remitted to the Certificateholder in cash.  If the Certificateholder
    acquired the same number of units at the same time in a regular secondary
    market transaction, the price would have been $3,068.80 ($2,900 for units
    and $168.80 for the sales charge, assuming a 5 1/2% sales charge times the
    public offering price).

    The Conversion Offer

               Certificateholders of any registered unit investment trust for
    which there is no active secondary market in the units of such trust (a
    "Redemption Trust") may elect to redeem such units and apply the proceeds
    of the redemption to the purchase of available Units of one or more series
    of A Corporate Trust, Municipal Securities Trust, Insured Municipal
    Securities Trust, Mortgage Securities Trust, New York Municipal Trust or
    Equity Securities Trust (upon receipt by the Equity Securities Trust of an
    appropriate exemptive order from the Securities and Exchange Commission)
    sponsored by Bear, Stearns & Co. Inc. or the Sponsor (the "Conversion
    Trusts") at the Public Offering Price for units of the Conversion Trust
    based on a reduced sales charge as set forth below.  Under the Conversion
    Offer, units of the Redemption Trust must be tendered to the trustee of
    such trust for redemption at the redemption price, which is based upon the
    aggregate bid side evaluation of the underlying bonds in such trust and is
    generally about 1-1.2% to 2% lower than the offering price for such bonds
    (or for Units of Equity Securities Trust, based on the market value of the
    underlying securities in the Equity Trust portfolio).  The purchase price
    of the Units will be based on the aggregate offer price of the Bonds in
    the Conversion Trust portfolio (or for Units of Equity Securities Trust,
    based on the market value of the underlying securities in the Equity Trust
    portfolio) during the public offering of the Conversion Trust; or, based
    on the aggregate bid price of the underlying bonds if the initial public
    offering of the Conversion Trust has been completed, plus accrued interest
    (or for Units of Equity Securities Trust, based on the market value of the
    underlying securities in the Equity Trust portfolio) and a sales charge as
    set forth below.

               Except for Certificateholders who wish to exercise the
    Conversion Offer within the first five months of their purchase of units
    of a Redemption Trust, the sales charge applicable to the purchase of
    Units of the Conversion Trust shall be $15 per Unit (or per 1,000 Units
    for the Mortgage Securities Trust or per 100 Units for the Equity
    Securities Trust).  For Certificateholders who wish to exercise the
    Conversion Offer within the first five months of their purchase of units
    of a Redemption Trust, the sales charge applicable to the purchase of
    Units of a Conversion Trust shall be the greater of (i) $15 per Unit (or
    per 1,000 Units for the Mortgage Securities Trust or per 100 Units for the
    Equity Securities Trust) or (ii) an amount which when coupled with the
    sales charge paid by the Certificateholder upon his original purchase of
    units of the Redemption Trust at least equals the sales charge applicable
    in the direct purchase of Units of a Conversion Trust.  The Conversion
    Offer is subject to the following limitations:

               (1)  The Conversion Offer is limited only to
          Certificateholders of any Redemption Trust, defined as a unit
          investment trust for which there is no active secondary market at
          the time the Certificateholder elects to participate in the
          Conversion Offer.  At the time of the Certificateholder's election
          to participate in the Conversion Offer, there also must be available
          units of a Conversion Trust, either under a primary distribution or
          in the Sponsor's secondary market.

               (2)  Exchanges under the Conversion Offer will be effected in
          whole units only.  Certificateholders will not be permitted to
          advance any new funds in order to complete an exchange under the
          Conversion Offer.  Any excess proceeds from units being redeemed
          will be returned to the Certificateholder.  Units of the Mortgage
          Securities Trust may only be acquired in blocks of 1,000 Units. 
          Units of the Equity Securities Trust may only be acquired in blocks
          of 100 Units.

               (3)  The Sponsor reserves the right to modify, suspend or
          terminate the Conversion Offer at any time without notice to
          Certificateholders of Redemption Trusts.  In the event the
          Conversion Offer is not available to a Certificateholder at the time
          he wishes to exercise it, the Certificateholder will be notified
          immediately and no action will be taken with respect to his units
          without further instruction from the Certificateholder.  The Sponsor
          also reserves the right to raise the sales charge based on actual
          increases in the Sponsor's costs and expenses in connection with
          administering the program, up to a maximum sales charge of $20 per
          unit (or per 1,000 units for the Mortgage Securities Trust or per
          100 units for the Equity Securities Trust).

               To exercise the Conversion Offer, a Certificateholder of a
    Redemption Trust should notify his retail broker of his desire to redeem
    his Redemption Trust Units and use the proceeds from the redemption to
    purchase Units of one or more of the Conversion Trusts.  If Units of a
    designated, outstanding series of a Conversion Trust are at that time
    available for sale and if such Units may lawfully be sold in the state in
    which the Certificateholder is a resident, the Certificateholder will be
    provided with a current prospectus or prospectuses relating to each
    Conversion Trust in which he indicates an interest.  He then may select
    the Trust or Trusts into which he decides to invest the proceeds from the
    sale of his Units.  The transaction will be handled entirely through the
    Certificateholder's retail broker.  The retail broker must tender the
    units to the trustee of the Redemption Trust for redemption and then apply
    the proceeds to the redemption toward the purchase of units of a
    Conversion Trust at a price based on the aggregate offer or bid side
    evaluation per Unit of the Conversion Trust, depending on which price is
    applicable, plus accrued interest and the applicable sales charge.  The
    certificates must be surrendered to the broker at the time the redemption
    order is placed and the broker must specify to the Sponsor that the
    purchase of Conversion Trust Units is being made pursuant to the
    Conversion Offer.  The Certificateholder's broker will be entitled to
    retain $5 of the applicable sales charge.

               Example:  Assume a Certificateholder has five units of a
    Redemption Trust which he has held for more than 5 months with a current
    redemption price of $675 per unit based on the aggregate bid price of the
    underlying bonds and the Certificateholder wishes to participate in the
    Conversion Offer and exchange the proceeds for units of a secondary market
    Conversion Trust with a current price of $750 per Unit.  The proceeds from
    the Certificateholder's redemption of units will aggregate $3,375.  Since
    only whole units of a Redemption Trust may be purchased under the
    Conversion Offer, the Certificateholder will be able to acquire four units
    of the Conversion Trust (or 4,000 Units of the Mortgage Securities Trust
    or 400 Units of the Equity Securities Trust) for a total cost of $2,860
    ($2,800 for units and $60 for the sales charge).  The remaining $515 would
    be remitted to the Certificateholder in cash.  If the Certificateholder
    acquired the same number of Conversion Trust units at the same time in a
    regular secondary market transaction, the price would have been $2,962.96
    ($2,800 for units and $162.96 sales charge, assuming a 5 1/2% sales charge
    times the public offering price).

    Description of the Exchange Trusts and the Conversion Trusts

               A Corporate Trust may be an appropriate investment vehicle for
    an investor who is more interested in a higher current return on his
    investment (although taxable) than a tax-exempt return (resulting from the
    fact that the current return from taxable fixed income securities is
    normally higher than that available from tax-exempt fixed income
    securities).  Municipal Securities Trust and New York Municipal Trust may
    be appropriate investment vehicles for an investor who is more interested
    in tax-exempt income.  The interest income from New York Municipal Trust
    is, in general, also exempt from New York State and local New York income
    taxes, while the interest income from Municipal Securities Trust is
    subject to applicable New York State and local New York taxes, except for
    that portion of the income which is attributable to New York obligations
    in the Trust portfolio, if any.  The interest income from each State Trust
    of the Municipal Securities Trust, Multi-State Series is, in general,
    exempt from state and local taxes when held by residents of the state
    where the issuers of bonds in such State Trusts are located.  The Insured
    Municipal Securities Trust combines the advantages of providing interest
    income free from regular federal income tax under existing law with the
    added safety of irrevocable insurance on the underlying obligations. 
    Insured Navigator Series further combines the advantages of providing
    interest income free from regular federal income tax and state and local
    taxes when held by residents of the state where issuers of bonds in such
    state trusts are located with the added safety of irrevocable insurance on
    the underlying obligations.  Mortgage Securities Trust offers an
    investment vehicle for investors who are interested in obtaining safety of
    capital and a high level of current distribution of interest income
    through investment in a fixed portfolio of collateralized mortgage
    obligations.  Equity Securities Trust offers investors an opportunity to
    achieve capital appreciation together with a high level of current income.

    Tax Consequences of the Exchange Privilege and the Conversion Offer

               A surrender of Units pursuant to the Exchange Privilege or the
    Conversion Offer will constitute a "taxable event" to the Certificate-
    holder under the Code.  The Certificateholder will realize a tax gain or
    loss that will be of a long- or short-term capital or ordinary income
    nature depending on the length of time the Units have been held and other
    factors.  A Certificateholder's tax basis in the Units acquired pursuant
    to the Exchange Privilege or Conversion Offer will be equal to the
    purchase price of such Units.  Investors should consult their own tax
    advisors as to the tax consequences to them of exchanging or redeeming
    units and participating in the Exchange Privilege or Conversion Offer. 


                                   OTHER MATTERS

    Legal Opinions
       
               The legality of the Units offered hereby and certain matters
    relating to federal tax law have been passed upon by Messrs. Battle
    Fowler, 75 East 55th Street, New York, New York 10022 as counsel for the
    Sponsor.  Messrs. Carter, Ledyard & Milburn, Two Wall Street, New York,
    New York 10005 have acted as counsel for United States Trust Company of
    New York.  On the initial date of deposit, Messrs. Booth & Baron, 122 East
    42nd Street, New York, New York 10168 acted as counsel for The Bank of New
    York. 
        
    Independent Auditors
       
               The financial statements of the Trusts included in Part A of
    this Prospectus as of the dates set forth in Part A, have been examined by
    KPMG Peat Marwick, independent certified public accountants, for the
    periods indicated in its reports appearing herein.  The financial
    statements examined by KPMG Peat Marwick have been so included in reliance
    on its report given upon the authority of said firm as experts in
    accounting and auditing. 
        

                           DESCRIPTION OF BOND RATINGS*

    Standard & Poor's Corporation

               A brief description of the applicable Standard & Poor's
    Corporation rating symbols and their meanings is as follows: 

       
    *     As described by Standard & Poor's Corporation.


        
               A Standard & Poor's corporate or municipal bond rating is a
    current assessment of the creditworthiness of an obligor with respect to a
    specific debt obligation.  This assessment of creditworthiness may take
    into consideration obligors such as guarantors, insurers, or lessees. 

               The bond rating is not a recommendation to purchase or sell a
    security, inasmuch as it does not comment as to market price. 

               The ratings are based on current information furnished to
    Standard & Poor's by the issuer and obtained by Standard & Poor's from
    other sources it considers reliable.  The ratings may be changed,
    suspended or withdrawn as a result of changes in, or unavailability of,
    such information. 

               The ratings are based, in varying degrees, on the following
    considerations: 

                    I. Likelihood of default-capacity and willingness of the
    obligor as to the timely payment of interest and repayment of principal in
    accordance with the terms of the obligation. 

                   II. Nature of and provisions of the obligation. 

                  III. Protection afforded by, and relative position of, the
    obligation in the event of bankruptcy, reorganization or other arrangement
    under the laws of bankruptcy and other laws affecting creditors' rights.

               AAA --  This is the highest rating assigned by Standard &
    Poor's to a debt obligation and indicates an extremely strong capacity to
    pay principal and interest. 

               AA --  Bonds rated AA also qualify as high-quality debt
    obligations.  Capacity to pay principal and interest is very strong, and
    they differ from AAA issues only in small degrees. 

               A --  Bonds rated A have a strong capacity to pay principal and
    interest, although they are somewhat more susceptible to the adverse
    effects of changes in circumstances and economic conditions. 

               BBB --  Bonds rated BBB are regarded as having an adequate
    capacity to pay principal and interest.  Whereas they normally exhibit
    adequate protection parameters, adverse economic conditions or changing
    circumstances are more likely to lead to a weakened capacity to pay
    principal and interest for bonds in this category than for bonds in the A
    category. 

               Plus (+) or Minus (-):  To provide more detailed indications of
    credit quality, the ratings from "AA" to "BB" may be modified by the
    addition of a plus or minus sign to show relative standing within the
    major rating categories. 

               Provisional Ratings (Prov.) following a rating indicates the
    rating is provisional, which assumes the successful completion of the
    project being financed by the issuance of the bonds being rated and
    indicates that payment of debt service requirements is largely or entirely
    dependent upon the successful and timely completion of the project.  This
    rating, however, while addressing credit quality subsequent to completion,
    makes no comment on the likelihood of, or the risk of default upon failure
    of, such completion.  Accordingly, the investor should exercise his own
    judgment with respect to such likelihood and risk. 

       
                        DESCRIPTION OF RATING ON THE UNITS*

        
               A Standard & Poor's Corporation's rating on the units of an
    investment trust (hereinafter referred to collectively as "units" and
    "fund") is a current assessment of creditworthiness with respect to the
    investments held by such fund.  This assessment takes into consideration
    the financial capacity of the issuers and of any guarantors, insurers,
    lessees, or mortgagors with respect to such investments.  The assessment,
    however, does not take into account the extent to which fund expenses or
    portfolio asset sales for less than the fund's purchase price will reduce
    payment to the unit holder of the interest and principal required to be
    paid on the portfolio assets.  In addition, the rating is not a
    recommendation to purchase, sell, or hold units, inasmuch as the rating
    does not comment as to market price of the units or suitability for a
    particular investor. 

    *     As described by Standard & Poor's Corporation.



               Funds rated "AAA" are composed exclusively of assets that are
    rated "AAA" by Standard & Poor's or have, in the opinion of Standard &
    Poor's, credit characteristics comparable to assets that are rated "AAA",
    or certain short-term investments.  Standard & Poor's defines its AAA
    rating for such assets as the highest rating assigned by Standard & Poor's
    to a debt obligation.  Capacity to pay interest and repay principal is
    very strong. 


    <PAGE>
                  FOR USE WITH INSURED MUNICIPAL SECURITIES TRUST
                        SERIES 1 - 4 (MULTIPLIER PORTFOLIO)
                    SERIES 1 - 2 AND 1ST - 8TH DISCOUNT SERIES  


    =========================================================================


            AUTHORIZATION FOR INVESTMENT IN MUNICIPAL SECURITIES TRUST
                           -- DISCOUNT SERIES/SERIES --
                        TRP PLAN - TOTAL REINVESTMENT PLAN


    I hereby elect to participate in the TRP Plan and am the owner of _____
    units ___ Discount Series/Series __________.

    I hereby authorize The Bank of New York, Trustee to pay all semi-annual or
    annual distributions of interest and principal (if any) with respect to
    such units to The Bank of New York, as TRP Plan Agent, who shall
    immediately invest the distributions in units of the available series of
    Insured Municipal Securities Trust above or, if unavailable, of other
    available series of Municipal Securities Trust. 


    The foregoing authorization is subject in        Date ______________, 19__
    all respects to the terms and conditions of
    participation set forth in the prospectus
    relating to such available series. 


    ___________________________________________                               
    Registered Holder (Print)                    Registered Holder (Print)


    ___________________________________________                               
    Registered Holder Signature                  Registered Holder Signature
                                           (Two signatures if joint tenancy)


    My Brokerage Firm's Name                                                  

    Street Address                                                            

    City, State and Zip Code                                                  

    Salesman's Name ___________________________  Salesman's No.               


                 UNIT HOLDERS NEED ONLY SIGN AND DATE THIS FORM. 


    ==========================================================================


                                MAIL TO YOUR BROKER
                                        OR
                               THE BANK OF NEW YORK
                       ATTN:  UNIT INVESTMENT TRUST DIVISION
                                101 BARCLAY STREET
                             NEW YORK, NEW YORK  10286


    <PAGE>
                  FOR USE WITH INSURED MUNICIPAL SECURITIES TRUST
                            9TH - 46TH DISCOUNT SERIES
                                   SERIES 3 - 19


    ==========================================================================


        AUTHORIZATION FOR INVESTMENT IN INSURED MUNICIPAL SECURITIES TRUST
<PAGE>



                           -- DISCOUNT SERIES/SERIES --
                        TRP PLAN - TOTAL REINVESTMENT PLAN


    I hereby elect to participate in the TRP Plan and am the owner of _____
    units ___ Discount Series/Series _______.

    I hereby authorize the United States Trust Company of New York, Trustee,
    to pay all semi-annual or annual distributions of interest and principal
    (if any) with respect to such units to the United States Trust Company of
    New York, as TRP Plan Agent, who shall immediately invest the
    distributions in units of the available series of Insured Municipal
    Securities Trust above or, if unavailable, of other available series of
    Municipal Securities Trust. 


    The foregoing authorization is subject in        Date ______________, 19__
    all respects to the terms and conditions of
    participation set forth in the prospectus
    relating to such available series. 


    ___________________________________________                               
    Registered Holder (Print)                    Registered Holder (Print)


    ___________________________________________                               
    Registered Holder Signature                  Registered Holder Signature
                                           (Two signatures if joint tenancy)


    My Brokerage Firm's Name                                                  

    Street Address                                                            

    City, State and Zip Code                                                  

    Salesman's Name ___________________________  Salesman's No.               


                 UNIT HOLDERS NEED ONLY SIGN AND DATE THIS FORM. 


    ==========================================================================


                                MAIL TO YOUR BROKER
                                        OR
                     UNITED STATES TRUST COMPANY OF NEW YORK 
                     ATTN:  UNIT INVESTMENT DEPARTMENT, UNIT A
                                   770 BROADWAY
                             NEW YORK, NEW YORK  10003


    <PAGE>
       
    
                        INDEX                                 INSURED
                                                     MUNICIPAL SECURITIES TRUST
    Title                                    Page     (Unit Investment Trust)
                                                             Prospectus
    Summary of Essential Information  . . .   A-5
    Information Regarding the Trust . . . .   A-7     Dated:  October 28, 1994
    Financial and Statistical Information .   A-8
    Audit and Financial Information                           Sponsor:
      Report of Independent Accountants . .   F-1    Bear, Stearns & Co. Inc. 
      Statement of Net Assets . . . . . . .   F-2         245 Park Avenue
      Statement of Operations . . . . . . .   F-3    New York, New York  10167
      Statement of Changes in Net Assets  .   F-4           212-272-2500
      Notes to Financial Statements . . . .   F-5
      Portfolio . . . . . . . . . . . . . .   F-6
    The Trust . . . . . . . . . . . . . . .     1
    Public Offering . . . . . . . . . . . .    11
    Estimated Long Term Return and                            Trustee:
      Estimated Current Return  . . . . . .    13
    Rights of Certificateholders  . . . . .    14   United States Trust Company
    Tax Status  . . . . . . . . . . . . . .    16           of New York
    Liquidity . . . . . . . . . . . . . . .    20           770 Broadway
    Total Reinvestment Plan . . . . . . . .    22    New York, New York  10003
    Trust Administration  . . . . . . . . .    27          1-800-428-8890
    Trust Expenses and Charges  . . . . . .    30
    Exchange Privilege and Conversion Offer    31                or
    Other Matters . . . . . . . . . . . . .    36
    Description of Bond Ratings . . . . . .    36      The Bank of New York 
    Description of Rating on the Units  . .    37        101 Barclay Street
                                                     New York, New York  10286
                                                           1-800-431-8002
    Parts A and B of this Prospectus do not
    contain all of the information set forth in
    the registration statement and exhibits
    relating thereto, filed with the Securities
    and Exchange Commission, Washington, D.C.,               Evaluator:
    under the Securities Act of 1933, and to
    which reference is made.                            Kenny S&P Evaluation
                                                              Services
                      *   *   *                             65 Broadway
                                                     New York, New York  10006 


               This Prospectus does not constitute an offer to sell, or a
    solicitation of an offer to buy, securities in any state to any person to
    whom it is not lawful to make such offer in such state. 

                                     *   *   *

               No person is authorized to give any information or to make any
    representations not contained in Parts A and B of this Prospectus; and any
    information or representation not contained herein must not be relied upon
    as having been authorized by the Trust, the Trustee, the Evaluator, or the
    Sponsor.  The Trust is registered as a unit investment trust under the
    Investment Company Act of 1940.  Such registration does not imply that the
    Trust or any of its Units have been guaranteed, sponsored, recommended or
    approved by the United States or any state or any agency or officer
    thereof.



<PAGE>

                                     PART II




                        ADDITIONAL INFORMATION NOT REQUIRED
                                   IN PROSPECTUS

                        CONTENTS OF REGISTRATION STATEMENT


    This Post-Effective Amendment to the Registration Statement on Form S-6
    comprises the following papers and documents: 

    The facing sheet on Form S-6. 
    The Cross-Reference Sheet. 
    The Prospectus consisting of     pages. 
    Signatures. 
    Consent of Independent Auditors. 
    Consent of Counsel (included in Exhibit 99.3.1).
Consents of the Evaluator and Confirmation of Ratings of Standard & Poor's
      Corporation (included in Exhibit 99.5.1).

    The following exhibits: 

    99.1.1     --   Reference Trust Agreement including certain Amendments to
                    the Trust Indenture and Agreement referred to under
                    Exhibit 1.1.1 below (filed as Exhibit 1.1 to Amendments
                    No. 1 to Form S-6 Registration Statements Nos. 33-07253,
                    33-07769, 33-08700, 33-09512 and 33-10166 of Insured
                    Municipal Securities Trust, 22nd Discount Series, 23rd
                    Discount Series, 24th Discount Series, 25th Discount
                    Series and 26th Discount Series, respectively, on July 15,
                    1986, September 4, 1986, October 2, 1986, November 6, 1986
                    and November 14, 1986, respectively, and incorporated
                    herein by reference). 

    99.1.1.1   --   Trust Indenture and Agreement for Insured Municipal
                    Securities Trust, 9th Discount Series and Subsequent
                    Series (filed as Exhibit 1.1.1 to Amendment No. 1 to
                    Form S-6 Registration Statement No. 2-95854 of Insured
                    Municipal Securities Trust, 9th Discount Series on
                    April 11, 1985 and incorporated herein by reference). 
       
    99.1.3.4   --   Certificate of Incorporation of Bear, Stearns & Co. Inc.,
                    as amended (filed as Exhibit 99.1.3.4 to Form S-6
                    Registration Statement Nos. 33-50891 and 33-50901 of
                    Insured Municipal Securities Trust, New York Navigator
                    Insured Series 15 and New Jersey Navigator Insured Series
                    11; and Municipal Securities Trust, Multi-State Series 44,
                    respectively, on December 9, 1993 and incorporated herein
                    by reference).

    99.1.3.5   --   By-Laws of Bear, Stearns & Co. Inc., as amended (filed as
                    Exhibit 99.1.3.5 to Form S-6 Registration Statement Nos.
                    33-50891 and 33-50901 of Insured Municipal Securities
                    Trust, New York Navigator Insured Series 15 and New Jersey
                    Navigator Insured Series 11; and Municipal Securities
                    Trust, Multi-State Series 44, respectively, on December 9,
                    1993 and incorporated herein by reference).
        
    99.1.4     --   Form of Agreement Among Underwriters (filed as Exhibit 1.4
                    to Amendment No. 1 to Form S-6 Registration Statement
                    No. 2-97191 of Insured Municipal Securities Trust, 10th
                    Discount Series and Series 3 on May 8, 1985, and
                    incorporated herein by reference). 

    99.1.5     --   Form of Insurance Policy of Financial Guaranty Insurance
                    Company for Sponsor-Insured Bonds (filed as Exhibit 1.5 to
                    Amendment No. 1 to Registration Statement No. 2-95261 of
                    Insured Municipal Securities Trust, 7th Discount Series on
                    February 7, 1985 and incorporated herein by reference).

    99.1.5.1   --   Form of Insurance Policy of Bond Investors Guaranty for
                    Sponsor-Insured Bonds (filed as Exhibit 1.5.1 to Amendment
                    No. 1 to Form S-6 Registration Statement No. 33-08700 of
                    Insured Municipal Securities Trust, 24th Discount Series
                    on October 2, 1986 and incorporated herein by reference).

    99.2.1     --   Form of Certificate (filed as Exhibit 2.1 to Amendment
                    No. 1 to Form S-6 Registration Statement No. 33-01313 of
                    Insured Municipal Securities Trust, 16th Discount Series
                    on November 27, 1985 and incorporated herein by
                    reference). 

    99.3.1     --   Opinion of Battle Fowler (formerly Battle, Fowler, Jaffin
                    & Kheel) as to the legality of the securities being
                    registered, including their consent to the filing thereof
                    and to the use of their name under the headings "Tax
                    Status" and "Legal Opinions" in the Prospectus, and to the
                    filing of their opinion regarding tax status of the Trust
                    (filed as Exhibit 3.1 to Amendments No. 1 to Form S-6
                    Registration Statements Nos. 33-07253, 33-07769, 33-08700,
                    33-09512 and 33-10166 of Insured Municipal Securities
                    Trust, 22nd Discount Series, 23rd Discount Series, 24th
                    Discount Series, 25th Discount Series and 26th Discount
                    Series, respectively, on July 15, 1986, September 4, 1986,
                    October 2, 1986 and November 6, 1986 and November 14,
                    1986, respectively, and incorporated herein by reference).

       
    *99.3.1.1  --   Opinion of Battle Fowler as to the legality of units being
                    registered.
        
    *99.5.1    --   Consents of the Evaluator and Confirmation of Ratings of
                    Standard & Poor's Corporation. 

    99.6.0     --   Power of Attorney of Bear, Stearns & Co. Inc., the
                    Depositor, by its Officers and a majority of its Directors
                    (filed as Exhibit 6.0 to Post-Effective Amendment No. 8 to
                    Form S-6 Registration Statements Nos. 2-92113, 2-92660,
                    2-93073, 2-93884 and 2-94545 of Municipal Securities
                    Trust, Multi-State Series 4, 5, 6, 7 and 8, respectively
                    on October 30, 1992 and incorporated herein by reference).
       
    *27        --   Financial Data Schedule(s) (for EDGAR filing only).
        
    *     Being filed by this Amendment.


    <PAGE>
                                    SIGNATURES
       
               Pursuant to the requirements of the Securities Act of 1933, the
    registrants, Insured Municipal Securities Trust, 22nd Discount Series,
    23rd Discount Series, 24th Discount Series, 25th Discount Series and 26th
    Discount Series, certify that they have met all of the requirements for
    effectiveness of this Post-Effective Amendment to the Registration
    Statements pursuant to Rule 485(b) under the Securities Act of 1933.  The
    registrants have duly caused this Post-Effective Amendment to the
    Registration Statements to be signed on their behalf by the undersigned,
    thereunto duly authorized, in the City of New York and State of New York
    on the 28th day of October, 1994.
        
               INSURED MUNICIPAL SECURITIES TRUST, 22ND DISCOUNT SERIES, 23RD
               DISCOUNT SERIES, 24TH DISCOUNT SERIES, 25TH DISCOUNT SERIES AND
               26TH DISCOUNT SERIES
                         (Registrants)

               BEAR, STEARNS & CO. INC.
                    (Depositor)

               By:  Peter J. DeMarco
                    (Authorized Signator)

               Pursuant to the requirements of the Securities Act of 1933,
    this Post-Effective Amendment to the Registration Statements has been
    signed below by the following persons, who constitute the principal
    officers and a majority of the directors of Bear, Stearns & Co. Inc., the
    Depositor, in the capacities and on the dates indicated.

       
    <TABLE> 

  <S>                       <C>                                  <C> 
  Name                      Title                                Date

  ALAN C. GREENBERG         Chairman of the Board,           )
                            Director and Senior Managing     )
                            Director                         )
  JAMES E. CAYNE            President, Chief Executive       )
                            Officer, Director and Senior     )   October 28, 1994
                            Managing Director                )
  JOHN C. SITES, JR.        Executive Vice President, Director
                                                             )
                            and Senior Managing Director     )
  MICHAEL L. TARNOPOL       Executive Vice President, Director
                                                             )
                            and Senior Managing Director     )   By:Peter J. DeMarco
  VINCENT J. MATTONE        Executive Vice President, Director
                                                             )      Attorney-in-Fact*
                            and Senior Managing Director     )
  ALAN D. SCHWARTZ          Executive Vice President, Director
                                                             )
                            and Senior Managing Director     )
  DOUGLAS P.C. NATION       Director and Senior Managing     )
                            Director                         )
  WILLIAM J. MONTGORIS      Chief Operating Officer/Chief    )
                            Financial Officer, Senior        )
                            Vice President-Finance and Senior)
                            Managing Director                )
  KENNETH L. EDLOW          Secretary and Senior Managing    )
                            Director                         )
  MICHAEL MINIKES           Treasurer and Senior Managing    )
                            Director                         )
  MICHAEL J. ABATEMARCO     Controller, Assistant Secretary  )
                            and Senior Managing Director     )
  MARK E. LEHMAN            Senior Vice President - General  )
                            Counsel and Senior Managing      )
  FREDERICK B. CASEY        Director                         )
                            Assistant Treasurer and Senior   )
                            Managing Director                )
    </TABLE> 
        
    _______________

    *     An executed power of attorney was filed as Exhibit 6.0 to Post-
          Effective Amendment No. 8 to Registration Statements Nos. 2-92113,
          2-92660, 2-93073, 2-93884 and 2-94545 on October 30, 1992.

    <PAGE>
                        CONSENT OF INDEPENDENT ACCOUNTANTS


We consent to the use in these Post-Effective Amendments to the Registration
Statements of our reports on the financial statements of Insured Municipal 
Securities Trust, 22nd Discount Series; Insured Municipal Securities Trust, 
23rd Discount Series; Insured Municipal Securities Trust, 24th Discount 
Series; Insured Municipal Securities Trust, 25th Discount Series; and Insured 
Municipal Securities Trust, 26th Discount Series included herein and to the 
reference to our firm under the heading "Independent Auditors" in the 
Prospectus which is part of this Registration Statement.

KPMG Peat Marwick LLP


New York, New York
October 26, 1994

    <PAGE>
                                   EXHIBIT INDEX

    Exhibit         Description                                       Page No.


    99.1.1          Reference Trust Agreement including
                    certain Amendments to the Trust Indenture
                    and Agreement referred to under
                    Exhibit 1.1.1 below (filed as Exhibit 1.1
                    to Amendments No. 1 to Form S-6
                    Registration Statements Nos. 33-07253, 33-
                    07769, 33-08700, 33-09512 and 33-10166 of
                    Insured Municipal Securities Trust, 22nd
                    Discount Series, 23rd Discount Series,
                    24th Discount Series, 25th Discount Series
                    and 26th Discount Series, respectively, on
                    July 15, 1986, September 4, 1986,
                    October 2, 1986, November 6, 1986 and
                    November 14, 1986, respectively, and
                    incorporated herein by reference). 

    99.1.1.1        Trust Indenture and Agreement for Insured
                    Municipal Securities Trust, 9th Discount
                    Series and Subsequent Series (filed as
                    Exhibit 1.1.1 to Amendment No. 1 to
                    Form S-6 Registration Statement No. 2-
                    95854 of Insured Municipal Securities
                    Trust, 9th Discount Series on April 11,
                    1985 and incorporated herein by
                    reference). 
       
    99.1.3.4        Certificate of Incorporation of Bear,
                    Stearns & Co. Inc., as amended (filed as
                    Exhibit 99.1.3.4 to Form S-6 Registration
                    Statement Nos. 33-50891 and 33-50901 of
                    Insured Municipal Securities Trust, New
                    York Navigator Insured Series 15 and New
                    Jersey Navigator Insured Series 11; and
                    Municipal Securities Trust, Multi-State
                    Series 44, respectively, on December 9,
                    1993 and incorporated herein by
                    reference).

    99.1.3.5        By-Laws of Bear, Stearns & Co. Inc., as
                    amended (filed as Exhibit 99.1.3.5 to Form
                    S-6 Registration Statement Nos. 33-50891
                    and 33-50901 of Insured Municipal
                    Securities Trust, New York Navigator
                    Insured Series 15 and New Jersey Navigator
                    Insured Series 11; and Municipal
                    Securities Trust, Multi-State Series 44,
                    respectively, on December 9, 1993 and
                    incorporated herein by reference).
        
    99.1.4          Form of Agreement Among Underwriters
                    (filed as Exhibit 1.4 to Amendment No. 1
                    to Form S-6 Registration Statement No. 2-
                    97191 of Insured Municipal Securities
                    Trust, 10th Discount Series and Series 1
                    on May 8, 1985 and incorporated herein by
                    reference). 

    99.1.5          Form of Insurance Policy of Financial
                    Guaranty Insurance Company for Sponsor-
                    Insured Bonds (filed as Exhibit 1.5 to
                    Amendment No. 1 to Registration Statement
                    No. 2-95261 of Insured Municipal
                    Securities Trust, 7th Discount Series on
                    February 7, 1985 and incorporated herein
                    by reference).

    99.1.5.1        Form of Insurance Policy of Bond Investors
                    Guaranty for Sponsor-Insured Bonds (filed
                    as Exhibit 1.5.1 to Amendment No. 1 to
                    Form S-6 Registration Statement No. 33-
                    08700 of Insured Municipal Securities
                    Trust, 24th Discount Series on October 2,
                    1986 and incorporated herein by
                    reference). 

    99.2.1          Form of Certificate (filed as Exhibit 2.1
                    to Amendment No. 1 to Form S-6
                    Registration Statement Nos. 33-01313 of
                    Insured Municipal Securities Trust, 16th
                    Discount  Series on November 27, 1985 and
                    incorporated herein by reference). 

    99.3.1          Opinion of Battle Fowler (formerly Battle,
                    Fowler, Jaffin & Kheel) as to the legality
                    of the securities being registered,
                    including their consent to the filing
                    thereof and to the use of their name under
                    the headings "Tax Status" and "Legal
                    Opinions" in the Prospectus, and to the
                    filing of their opinion regarding tax
                    status of the Trust (filed as Exhibit 3.1
                    to Amendments No. 1 to Form S-6
                    Registration Statements Nos. 33-07253, 33-
                    07769, 33-08700, 33-09512 and 33-10166 of
                    Insured Municipal Securities Trust, 22nd
                    Discount Series, 23rd Discount Series,
                    24th Discount Series, 25th Discount Series
                    and 26th Discount Series, respectively, on
                    July 15, 1986, September 4, 1986,
                    October 2, 1986, November 6, 1986 and
                    November 14, 1986, respectively, and
                    incorporated herein by reference). 
       
    99.3.1.1        Opinion of Battle Fowler as to the legality of units being
                    registered............................................
        
    99.5.1          Consents of the Evaluator and Confirmation
                    of Ratings of Standard & Poor's
                    Corporation......................

    99.6.0          Power of Attorney of Bear, Stearns & Co.
                    Inc., the Depositor, by its Officers and a
                    majority of its Directors (filed as
                    Exhibit 6.0 to Post-Effective Amendment
                    No. 8 to Form S-6 Registration Statements
                    Nos. 2-92113, 2-92660, 2-93073, 2-93884
                    and 2-94545 of Municipal Securities Trust,
                    Multi-State Series 4, 5, 6, 7 and 8,
                    respectively on October 30, 1992 and
                    incorporated herein by reference).
       
    27              Financial Data Schedule(s) (for EDGAR filing only)...
        

<TABLE> <S> <C>

<ARTICLE>                         6
<LEGEND>                          The schedule contains summary financial
                                  information extracted from the financial
                                  statements and supporting schedules as 
                                  of the end of the most current period 
                                  and is qualified in its entirety by 
                                  reference to such financial statements
</LEGEND>
<CIK>                             0000797224
<NAME>                            INSURED MST, 22ND DISCOUNT SERIES
       
<S>                               <C>
<FISCAL-YEAR-END>                 Jun-30-1994                                                         
<PERIOD-START>                    Jul-01-1993                                                         
<PERIOD-END>                      Jun-30-1994                                                         
<PERIOD-TYPE>                     YEAR                                                                
<INVESTMENTS-AT-COST>             6500237                                                             
<INVESTMENTS-AT-VALUE>            6147311                                                             
<RECEIVABLES>                     132425                                                              
<ASSETS-OTHER>                    24880                                                               
<OTHER-ITEMS-ASSETS>              0                                                                   
<TOTAL-ASSETS>                    6304616                                                             
<PAYABLE-FOR-SECURITIES>          0                                                                   
<SENIOR-LONG-TERM-DEBT>           0                                                                   
<OTHER-ITEMS-LIABILITIES>         696                                                                 
<TOTAL-LIABILITIES>               696                                                                 
<SENIOR-EQUITY>                   0                                                                   
<PAID-IN-CAPITAL-COMMON>          0                                                                   
<SHARES-COMMON-STOCK>             13947                                                               
<SHARES-COMMON-PRIOR>             1856                                                                
<ACCUMULATED-NII-CURRENT> 	  272518                                                              
<OVERDISTRIBUTION-NII>            0                                                                   
<ACCUMULATED-NET-GAINS>           67                                                                  
<OVERDISTRIBUTION-GAINS>          0                                                                   
<ACCUM-APPREC-OR-DEPREC>          352926                                                              
<NET-ASSETS>                      6303920                                                             
<DIVIDEND-INCOME>                 0                                                                   
<INTEREST-INCOME>                 564921                                                              
<OTHER-INCOME>                    20589                                                               
<EXPENSES-NET>                    17982                                                               
<NET-INVESTMENT-INCOME>           567528                                                              
<REALIZED-GAINS-CURRENT>          (84460)                                                              
<APPREC-INCREASE-CURRENT>         (315443)                                                             
<NET-CHANGE-FROM-OPS>             167625                                                              
<EQUALIZATION>                    0                                                                   
<DISTRIBUTIONS-OF-INCOME>         556286                                                              
<DISTRIBUTIONS-OF-GAINS>          1380067                                                             
<DISTRIBUTIONS-OTHER>             0                                                                   
<NUMBER-OF-SHARES-SOLD>           0                                                                   
<NUMBER-OF-SHARES-REDEEMED>       30                                                                  
<SHARES-REINVESTED>               0                                                                   
<NET-CHANGE-IN-ASSETS>            (1768728)                                                            
<ACCUMULATED-NII-PRIOR>           266035                                                              
<ACCUMULATED-GAINS-PRIOR>         24609                                                               
<OVERDISTRIB-NII-PRIOR>           0                                                                   
<OVERDIST-NET-GAINS-PRIOR>        0                                                                   
<GROSS-ADVISORY-FEES>             0                                                                   
<INTEREST-EXPENSE>                0                                                                   
<GROSS-EXPENSE>                   0
<AVERAGE-NET-ASSETS>              7188284                                                             
<PER-SHARE-NAV-BEGIN>             577.57                                                              
<PER-SHARE-NII>                   37.43                                                               
<PER-SHARE-GAIN-APPREC>           0                                                                
<PER-SHARE-DIVIDEND>              43.85                                                               
<PER-SHARE-DISTRIBUTIONS>         97.77                                                               
<RETURNS-OF-CAPITAL>              0                                                                   
<PER-SHARE-NAV-END>               451.99                                                              
<EXPENSE-RATIO>                   0                                                                   
<AVG-DEBT-OUTSTANDING>            0                                                                   
<AVG-DEBT-PER-SHARE>              0                                                                
        

</TABLE>

<TABLE> <S> <C>

<ARTICLE>                         6
<LEGEND>                          The schedule contains summary financial
                                  information extracted from the financial
                                  statements and supporting schedules as 
                                  of the end of the most current period 
                                  and is qualified in its entirety by 
                                  reference to such financial statements
</LEGEND>
<CIK>                             0000799010
<NAME>                            INSURED MST, 23RD DISCOUNT SERIES
       
<S>                               <C>
<FISCAL-YEAR-END>                 Jun-30-1994                                                         
<PERIOD-START>                    Jul-01-1993                                                         
<PERIOD-END>                      Jun-30-1994                                                         
<PERIOD-TYPE>                     YEAR                                                                
<INVESTMENTS-AT-COST>             5704858                                                             
<INVESTMENTS-AT-VALUE>            5368270                                                             
<RECEIVABLES>                     127390                                                              
<ASSETS-OTHER>                    1412                                                                
<OTHER-ITEMS-ASSETS>              0                                                                   
<TOTAL-ASSETS>                    5497072                                                             
<PAYABLE-FOR-SECURITIES>          0                                                                   
<SENIOR-LONG-TERM-DEBT>           0                                                                   
<OTHER-ITEMS-LIABILITIES>         594                                                                 
<TOTAL-LIABILITIES>               594                                                                 
<SENIOR-EQUITY>                   0                                                                   
<PAID-IN-CAPITAL-COMMON>          0                                                                   
<SHARES-COMMON-STOCK>             12985                                                               
<SHARES-COMMON-PRIOR>             13000                                                               
<ACCUMULATED-NII-CURRENT> 	  244121                                                              
<OVERDISTRIBUTION-NII>            0                                                                   
<ACCUMULATED-NET-GAINS>           77                                                                  
<OVERDISTRIBUTION-GAINS>          0                                                                   
<ACCUM-APPREC-OR-DEPREC>          (336588)                                                             
<NET-ASSETS>                      5496478                                                             
<DIVIDEND-INCOME>                 0                                                                   
<INTEREST-INCOME>                 503399                                                              
<OTHER-INCOME>                    20659                                                               
<EXPENSES-NET>                    17061                                                               
<NET-INVESTMENT-INCOME>           506997                                                              
<REALIZED-GAINS-CURRENT>          (112297)                                                             
<APPREC-INCREASE-CURRENT>         (225914)                                                             
<NET-CHANGE-FROM-OPS>             168786                                                              
<EQUALIZATION>                    0                                                                   
<DISTRIBUTIONS-OF-INCOME>         493061                                                              
<DISTRIBUTIONS-OF-GAINS>          1096055                                                             
<DISTRIBUTIONS-OTHER>             0                                                                   
<NUMBER-OF-SHARES-SOLD>           0                                                                   
<NUMBER-OF-SHARES-REDEEMED>       15                                                                  
<SHARES-REINVESTED>               0                                                                   
<NET-CHANGE-IN-ASSETS>            (14420330)                                                           
<ACCUMULATED-NII-PRIOR>           235312                                                              
<ACCUMULATED-GAINS-PRIOR>         29157                                                               
<OVERDISTRIB-NII-PRIOR>           0                                                                   
<OVERDIST-NET-GAINS-PRIOR>        0                                                                   
<GROSS-ADVISORY-FEES>             0                                                                   
<INTEREST-EXPENSE>                0                                                                   
<GROSS-EXPENSE>                   0
<AVERAGE-NET-ASSETS>              6206643                                                             
<PER-SHARE-NAV-BEGIN>             532.06                                                              
<PER-SHARE-NII>                   32.48                                                               
<PER-SHARE-GAIN-APPREC>           0                                                                
<PER-SHARE-DIVIDEND>              40.13                                                               
<PER-SHARE-DISTRIBUTIONS>         83.83                                                               
<RETURNS-OF-CAPITAL>              0                                                                   
<PER-SHARE-NAV-END>               423.29                                                              
<EXPENSE-RATIO>                   0                                                                   
<AVG-DEBT-OUTSTANDING>            0                                                                   
<AVG-DEBT-PER-SHARE>              0                                                                
        

</TABLE>

<TABLE> <S> <C>

<ARTICLE>                         6
<LEGEND>                          The schedule contains summary financial
                                  information extracted from the financial
                                  statements and supporting schedules as 
                                  of the end of the most current period 
                                  and is qualified in its entirety by 
                                  reference to such financial statements
</LEGEND>
<CIK>                             0000801326
<NAME>                            INSURED MST, 24TH DISCOUNT SERIES
       
<S>                               <C>
<FISCAL-YEAR-END>                 Jun-30-1994                                                         
<PERIOD-START>                    Jul-01-1993                                                         
<PERIOD-END>                      Jun-30-1994                                                         
<PERIOD-TYPE>                     YEAR                                                                
<INVESTMENTS-AT-COST>             7580123                                                             
<INVESTMENTS-AT-VALUE>            7316760                                                             
<RECEIVABLES>                     192481                                                              
<ASSETS-OTHER>                    0                                                                   
<OTHER-ITEMS-ASSETS>              0                                                                   
<TOTAL-ASSETS>                    7509241                                                             
<PAYABLE-FOR-SECURITIES>          34687                                                               
<SENIOR-LONG-TERM-DEBT>           0                                                                   
<OTHER-ITEMS-LIABILITIES>         688                                                                 
<TOTAL-LIABILITIES>               35375                                                               
<SENIOR-EQUITY>                   0                                                                   
<PAID-IN-CAPITAL-COMMON>          0                                                                   
<SHARES-COMMON-STOCK>             13085                                                               
<SHARES-COMMON-PRIOR>             13786                                                               
<ACCUMULATED-NII-CURRENT> 	  163787                                                              
<OVERDISTRIBUTION-NII>            0                                                                   
<ACCUMULATED-NET-GAINS>           0                                                                   
<OVERDISTRIBUTION-GAINS>          6681                                                                
<ACCUM-APPREC-OR-DEPREC>          (263363)                                                             
<NET-ASSETS>                      7473866                                                             
<DIVIDEND-INCOME>                 0                                                                   
<INTEREST-INCOME>                 636525                                                              
<OTHER-INCOME>                    2905                                                                
<EXPENSES-NET>                    13251                                                               
<NET-INVESTMENT-INCOME>           626179                                                              
<REALIZED-GAINS-CURRENT>          (3608)                                                               
<APPREC-INCREASE-CURRENT>         (431263)                                                             
<NET-CHANGE-FROM-OPS>             191308                                                              
<EQUALIZATION>                    0                                                                   
<DISTRIBUTIONS-OF-INCOME>         629255                                                              
<DISTRIBUTIONS-OF-GAINS>          393525                                                              
<DISTRIBUTIONS-OTHER>             0                                                                   
<NUMBER-OF-SHARES-SOLD>           0                                                                   
<NUMBER-OF-SHARES-REDEEMED>       701                                                                 
<SHARES-REINVESTED>               0                                                                   
<NET-CHANGE-IN-ASSETS>            (831472)                                                             
<ACCUMULATED-NII-PRIOR>           185002                                                              
<ACCUMULATED-GAINS-PRIOR>         0                                                                   
<OVERDISTRIB-NII-PRIOR>           0                                                                   
<OVERDIST-NET-GAINS-PRIOR>        9466                                                                
<GROSS-ADVISORY-FEES>             0                                                                   
<INTEREST-EXPENSE>                0                                                                   
<GROSS-EXPENSE>                   0
<AVERAGE-NET-ASSETS>              7889602                                                             
<PER-SHARE-NAV-BEGIN>             602.45                                                              
<PER-SHARE-NII>                   45.84                                                               
<PER-SHARE-GAIN-APPREC>           0                                                                
<PER-SHARE-DIVIDEND>              45.50                                                               
<PER-SHARE-DISTRIBUTIONS>         0                                                                
<RETURNS-OF-CAPITAL>              0                                                                   
<PER-SHARE-NAV-END>               571.18                                                              
<EXPENSE-RATIO>                   0                                                                   
<AVG-DEBT-OUTSTANDING>            0                                                                   
<AVG-DEBT-PER-SHARE>              0                                                                
        

</TABLE>

<TABLE> <S> <C>

<ARTICLE>                         6
<LEGEND>                          The schedule contains summary financial
                                  information extracted from the financial
                                  statements and supporting schedules as 
                                  of the end of the most current period 
                                  and is qualified in its entirety by 
                                  reference to such financial statements
</LEGEND>
<CIK>                             0000804082
<NAME>                            INSURED MST, 25TH DISCOUNT SERIES
       
<S>                               <C>
<FISCAL-YEAR-END>                 Jun-30-1994                                                         
<PERIOD-START>                    Jul-01-1993                                                         
<PERIOD-END>                      Jun-30-1994                                                         
<PERIOD-TYPE>                     YEAR                                                                
<INVESTMENTS-AT-COST>             7493901                                                             
<INVESTMENTS-AT-VALUE>            7269648                                                             
<RECEIVABLES>                     208267                                                              
<ASSETS-OTHER>                    0                                                                   
<OTHER-ITEMS-ASSETS>              0                                                                   
<TOTAL-ASSETS>                    7477915                                                             
<PAYABLE-FOR-SECURITIES>          48282                                                               
<SENIOR-LONG-TERM-DEBT>           0                                                                   
<OTHER-ITEMS-LIABILITIES>         809                                                                 
<TOTAL-LIABILITIES>               49091                                                               
<SENIOR-EQUITY>                   0                                                                   
<PAID-IN-CAPITAL-COMMON>          0                                                                   
<SHARES-COMMON-STOCK>             13850                                                               
<SHARES-COMMON-PRIOR>             13917                                                               
<ACCUMULATED-NII-CURRENT> 	  214200                                                              
<OVERDISTRIBUTION-NII>            0                                                                   
<ACCUMULATED-NET-GAINS>           126                                                                 
<OVERDISTRIBUTION-GAINS>          0                                                                   
<ACCUM-APPREC-OR-DEPREC>          (224253)                                                             
<NET-ASSETS>                      7428824                                                             
<DIVIDEND-INCOME>                 0                                                                   
<INTEREST-INCOME>                 572317                                                              
<OTHER-INCOME>                    12002                                                               
<EXPENSES-NET>                    15176                                                               
<NET-INVESTMENT-INCOME>           569143                                                              
<REALIZED-GAINS-CURRENT>          (21344)                                                              
<APPREC-INCREASE-CURRENT>         (380023)                                                             
<NET-CHANGE-FROM-OPS>             167776                                                              
<EQUALIZATION>                    0                                                                   
<DISTRIBUTIONS-OF-INCOME>         556528                                                              
<DISTRIBUTIONS-OF-GAINS>          77845                                                               
<DISTRIBUTIONS-OTHER>             0                                                                   
<NUMBER-OF-SHARES-SOLD>           0                                                                   
<NUMBER-OF-SHARES-REDEEMED>       67                                                                  
<SHARES-REINVESTED>               0                                                                   
<NET-CHANGE-IN-ASSETS>            (466597)                                                             
<ACCUMULATED-NII-PRIOR>           222402                                                              
<ACCUMULATED-GAINS-PRIOR>         121                                                                 
<OVERDISTRIB-NII-PRIOR>           0                                                                   
<OVERDIST-NET-GAINS-PRIOR>        0                                                                   
<GROSS-ADVISORY-FEES>             0                                                                   
<INTEREST-EXPENSE>                0                                                                   
<GROSS-EXPENSE>                   0
<AVERAGE-NET-ASSETS>              7662123                                                             
<PER-SHARE-NAV-BEGIN>             567.32                                                              
<PER-SHARE-NII>                   40.46                                                               
<PER-SHARE-GAIN-APPREC>           0                                                                
<PER-SHARE-DIVIDEND>              40.53                                                               
<PER-SHARE-DISTRIBUTIONS>         2.99                                                                
<RETURNS-OF-CAPITAL>              0                                                                   
<PER-SHARE-NAV-END>               536.38                                                              
<EXPENSE-RATIO>                   0                                                                   
<AVG-DEBT-OUTSTANDING>            0                                                                   
<AVG-DEBT-PER-SHARE>              0                                                                
        

</TABLE>

<TABLE> <S> <C>

<ARTICLE>                         6
<LEGEND>                          The schedule contains summary financial
                                  information extracted from the financial
                                  statements and supporting schedules as 
                                  of the end of the most current period 
                                  and is qualified in its entirety by 
                                  reference to such financial statements
</LEGEND>
<CIK>                             0000806088
<NAME>                            INSURED MST, 26TH DISCOUNT SERIES
       
<S>                               <C>
<FISCAL-YEAR-END>                 Jun-30-1994                                                         
<PERIOD-START>                    Jul-01-1993                                                         
<PERIOD-END>                      Jun-30-1994                                                         
<PERIOD-TYPE>                     YEAR                                                                
<INVESTMENTS-AT-COST>             6626798                                                             
<INVESTMENTS-AT-VALUE>            6284001                                                             
<RECEIVABLES>                     134934                                                              
<ASSETS-OTHER>                    0                                                                   
<OTHER-ITEMS-ASSETS>              0                                                                   
<TOTAL-ASSETS>                    6418935                                                             
<PAYABLE-FOR-SECURITIES>          12260                                                               
<SENIOR-LONG-TERM-DEBT>           0                                                                   
<OTHER-ITEMS-LIABILITIES>         1124                                                                
<TOTAL-LIABILITIES>               13384                                                               
<SENIOR-EQUITY>                   0                                                                   
<PAID-IN-CAPITAL-COMMON>          0                                                                   
<SHARES-COMMON-STOCK>             11886                                                               
<SHARES-COMMON-PRIOR>             12000                                                               
<ACCUMULATED-NII-CURRENT>      	  269022                                                              
<OVERDISTRIBUTION-NII>            0                                                                   
<ACCUMULATED-NET-GAINS>           0                                                                   
<OVERDISTRIBUTION-GAINS>          11633                                                               
<ACCUM-APPREC-OR-DEPREC>          (342797)                                                             
<NET-ASSETS>                      6405551                                                             
<DIVIDEND-INCOME>                 0                                                                   
<INTEREST-INCOME>                 520454                                                              
<OTHER-INCOME>                    24236                                                               
<EXPENSES-NET>                    18657                                                               
<NET-INVESTMENT-INCOME>           526033                                                              
<REALIZED-GAINS-CURRENT>          (57266)                                                              
<APPREC-INCREASE-CURRENT>         (307726)                                                             
<NET-CHANGE-FROM-OPS>             161041                                                              
<EQUALIZATION>                    0                                                                   
<DISTRIBUTIONS-OF-INCOME>         5028521787                                                          
<DISTRIBUTIONS-OF-GAINS>          415348                                                              
<DISTRIBUTIONS-OTHER>             0                                                                   
<NUMBER-OF-SHARES-SOLD>           0                                                                   
<NUMBER-OF-SHARES-REDEEMED>       114                                                                 
<SHARES-REINVESTED>               0                                                                   
<NET-CHANGE-IN-ASSETS>            (758946)                                                             
<ACCUMULATED-NII-PRIOR>           247628                                                              
<ACCUMULATED-GAINS-PRIOR>         40                                                                  
<OVERDISTRIB-NII-PRIOR>           0                                                                   
<OVERDIST-NET-GAINS-PRIOR>        0                                                                   
<GROSS-ADVISORY-FEES>             0                                                                   
<INTEREST-EXPENSE>                0                                                                   
<GROSS-EXPENSE>                   0
<AVERAGE-NET-ASSETS>              6785024                                                             
<PER-SHARE-NAV-BEGIN>             597.04                                                              
<PER-SHARE-NII>                   40.66                                                               
<PER-SHARE-GAIN-APPREC>           0                                                                
<PER-SHARE-DIVIDEND>              43.77                                                               
<PER-SHARE-DISTRIBUTIONS>         29.49                                                               
<RETURNS-OF-CAPITAL>              0                                                                   
<PER-SHARE-NAV-END>               538.92                                                              
<EXPENSE-RATIO>                   0                                                                   
<AVG-DEBT-OUTSTANDING>            0                                                                   
<AVG-DEBT-PER-SHARE>              0                                                                
        

</TABLE>









                                       BATTLE FOWLER 
                                    75 EAST 55TH STREET 
                                 NEW YORK, NEW YORK 10022 






                                  (212) 856-7000


                                 October 28, 1994


    Bear, Stearns & Co. Inc.
    245 Park Avenue
    New York, New York 10167

              Re:  Insured Municipal Securities Trust, 23rd Discount
                   Series                                           

    Gentlemen:

         We have acted as counsel for Bear Stearns & Co., Inc. as Depositor
    and Sponsor (the "Depositor") of Insured Municipal Securities Trust, 23rd
    Discount Series (the "Trust") in connection with the preparation of Post-
    Effective Amendment No. 8 to Registration Statement on Form S-6 (the
    "Registration Statement") filed pursuant to Rule 24e-2 of the Securities
    Act of 1933 registering the issuance by the Trust of 1,053 units of
    fractional undivided interest of the Trust (the "Units"). Such Units were
    originally issued by the Trust on September 4, 1986 and are being
    registered under the Registration Statement for resale by the Depositor of
    the Trust.  All terms specifically defined in such Registration Statement
    shall have the same meaning when used herein.

         We have examined copies of the following documents (a) the Trust
    Indenture and Reference Trust Agreement, dated September 4, 1986, relating
    to the Trust among the Depositor, United States Trust Company of New York,
    as Trustee, and Standard & Poor's Corporation, as Evaluator (the "Trust
    Agreements") pursuant to which the Units were originally issued; (b) the
    Notification of Registration on Form N-8A and the Registration Statement
    on Form N-8B-2, as amended, relating to the Trust, as filed with the
    Securities and Exchange Commission (the "Commission") pursuant to the
    Investment Company Act of 1940 (the "1940 Act"); (c) the Registration
    Statement on Form S-6 (Registration No. 33-07769) filed with the
    Commission pursuant to the Securities Act of 1933 (the "1933 Act"), and
    Amendment No. 1 thereto (said Registration Statement, as amended by said
    Amendment No. 1 being herein called the "Registration Statement") and all
    subsequent Post-Effective Amendments to the Registration Statement as
    filed with the Commission; (d) the proposed form of final Prospectus (the
    "Prospectus") relating to the Units, which is expected to be filed with
    the Commission this day; (e) certified resolutions of the Executive
    Committee of the Depositor authorizing the execution and delivery by the
    Depositor of the Trust Agreements and the consummation of the transactions
    contemplated thereby; (f) the Certificate of Incorporation and By-Laws of
    the Depositor,  each certified to by an authorized officer of the
    Depositor as of a recent date; and (g) a certificate of an authorized
    officer of the Depositor with respect to certain factual matters contained
    therein.

              We have also examined the Application for Orders of Exemption
    from certain provisions of Sections 14(a) and 22(d) of the 1940 Act and
    Rules 19b-1 and 22c-1 thereunder, and the First Amendment thereto, and the
    Application for Orders of Exemption from certain provisions of
    Sections 11(a) and 11(c) and 22(d) of the 1940 Act, which have been filed
    with the Commission by Bear, Stearns & Co. Inc. on behalf of New York
    Municipal Trust, Series 1 and Subsequent Series, and the related exemptive
    Orders issued on November 8, 1978 and April 29, 1981 and the Application
    for an Amended Order of Exemption from certain provisions of Section 11(a)
    of the 1940 Act, which has been filed with the Commission by the
    Depositors; the Trusts; Municipal Securities Trust, Series 1 (and
    Subsequent Series (including Insured Municipal Securities Trust, Series 1
    (and Subsequent Series) and 5th Discount Series (and Subsequent Series));
    New York Municipal Trust, Series 1 (and Subsequent Series); and A
    Corporate Trust, Series 1 (and Subsequent Series) on October 2, 1990 and
    as amended thereafter and the related Exemptive Order (IC-18290) issued by
    the Commission on August 28, 1991.  

              In rendering this opinion we have assumed the genuineness of all
    signatures, the authenticity and completeness of all documents,
    certificates and instruments submitted to us as originals, the conformity
    with the originals of all documents, certificates and instruments
    submitted to us as copies and the legal capacity to sign of all
    individuals executing such documents, certificates and instruments.

              We have assumed that each party has duly authorized, executed
    and delivered each of the Trust Agreements, Registration Statement and
    other instruments, certificates, agreements, documents executed in
    connection with the transactions contemplated thereby (collectively "UIT
    Documents") to which it is a party.

              We have assumed that each party is duly qualified and has full
    power and authority to perform its obligations under the UIT Documents and
    the transactions contemplated by the UIT Documents. 

              We have assumed that each party complied with all orders, rules,
    regulations applicable to it or in connection with the UIT Documents or
    the transactions contemplated thereby.  We have further assumed that no
    party  to the transaction contemplated by the UIT Documents is subject to
    any statute, rule or regulation, or to any impediment to which contracting
    parties are not generally subject, which requires such party to obtain the
    authorization or consent of, or to register or make a declaration or
    filing with, or inquiry of any governmental agency or regulatory
    authority.

              Based on such examination and assumptions, we are of the opinion
    that the Units when sold by the Depositor and purchased and paid for by
    the Unitholder, duly executed, authenticated and delivered in accordance
    with the Trust Agreement and the Registration Statement relating to such
    Units, the Units will be (i) validly issued, fully paid and nonassessable
    and (iii) legal, valid and binding obligations of the Trust, and the
    holders of the Units will be entitled to the benefits of the related Trust
    Agreement, except as enforcement thereof may be limited by applicable
    bankruptcy, insolvency, reorganization, arrangement, fraudulent
    conveyance, moratorium or other laws relating to or affecting the
    enforcement of creditors' rights generally and general principles of
    equity regardless of whether such enforceability is considered in a
    proceeding in equity or at law.  

              We hereby consent to the filing of this opinion as an exhibit to
    the Registration Statement and further consent to the use of our name
    wherever appearing in the Registration Statement, including the Prospectus
    and forms of Prospectus Supplements constituting a part thereof, as
    originally filed or as amended or supplemented.

                                       Very truly yours,



                                       Battle Fowler 

    <PAGE>

                                       BATTLE FOWLER 
                                    75 EAST 55TH STREET 
                                 NEW YORK, NEW YORK 10022 
     


                                  (212) 856-7000


                                 October 28, 1994


    Bear, Stearns & Co. Inc.
    245 Park Avenue
    New York, New York 10167

              Re:  Insured Municipal Securities Trust, 24th Discount
                   Series                                           

    Gentlemen:

         We have acted as counsel for Bear Stearns & Co., Inc. as Depositor
    and Sponsor (the "Depositor") of Insured Municipal Securities Trust, 24th
    Discount Series (the "Trust") in connection with the preparation of Post-
    Effective Amendment No. 8 to Registration Statement on Form S-6 (the
    "Registration Statement") filed pursuant to Rule 24e-2 of the Securities
    Act of 1933 registering the issuance by the Trust of 1,089 units of
    fractional undivided interest of the Trust (the "Units"). Such Units were
    originally issued by the Trust on October 2, 1986 and are being registered
    under the Registration Statement for resale by the Depositor of the Trust. 
    All terms specifically defined in such Registration Statement shall have
    the same meaning when used herein.

         We have examined copies of the following documents (a) the Trust
    Indenture and Reference Trust Agreement, dated October 2, 1986, relating
    to the Trust among the Depositor, United States Trust Company of New York,
    as Trustee, and Standard & Poor's Corporation, as Evaluator (the "Trust
    Agreements") pursuant to which the Units were originally issued; (b) the
    Notification of Registration on Form N-8A and the Registration Statement
    on Form N-8B-2, as amended, relating to the Trust, as filed with the
    Securities and Exchange Commission (the "Commission") pursuant to the
    Investment Company Act of 1940 (the "1940 Act"); (c) the Registration
    Statement on Form S-6 (Registration No. 33-08700) filed with the
    Commission pursuant to the Securities Act of 1933 (the "1933 Act"), and
    Amendment No. 1 thereto (said Registration Statement, as amended by said
    Amendment No. 1 being herein called the "Registration Statement") and all
    subsequent Post-Effective Amendments to the Registration Statement as
    filed with the Commission; (d) the proposed form of final Prospectus (the
    "Prospectus") relating to the Units, which is expected to be filed with
    the Commission this day; (e) certified resolutions of the Executive
    Committee of the Depositor authorizing the execution and delivery by the
    Depositor of the Trust Agreements and the consummation of the transactions
    contemplated thereby; (f) the Certificate of Incorporation and By-Laws of
    the Depositor,  each certified to by an authorized officer of the
    Depositor as of a recent date; and (g) a certificate of an authorized
    officer of the Depositor with respect to certain factual matters contained
    therein.

              We have also examined the Application for Orders of Exemption
    from certain provisions of Sections 14(a) and 22(d) of the 1940 Act and
    Rules 19b-1 and 22c-1 thereunder, and the First Amendment thereto, and the
    Application for Orders of Exemption from certain provisions of
    Sections 11(a) and 11(c) and 22(d) of the 1940 Act, which have been filed
    with the Commission by Bear, Stearns & Co. Inc. on behalf of New York
    Municipal Trust, Series 1 and Subsequent Series, and the related exemptive
    Orders issued on November 8, 1978 and April 29, 1981 and the Application
    for an Amended Order of Exemption from certain provisions of Section 11(a)
    of the 1940 Act, which has been filed with the Commission by the
    Depositors; the Trusts; Municipal Securities Trust, Series 1 (and
    Subsequent Series (including Insured Municipal Securities Trust, Series 1
    (and Subsequent Series) and 5th Discount Series (and Subsequent Series));
    New York Municipal Trust, Series 1 (and Subsequent Series); and A
    Corporate Trust, Series 1 (and Subsequent Series) on October 2, 1990 and
    as amended thereafter and the related Exemptive Order (IC-18290) issued by
    the Commission on August 28, 1991.  

              In rendering this opinion we have assumed the genuineness of all
    signatures, the authenticity and completeness of all documents,
    certificates and instruments submitted to us as originals, the conformity
    with the originals of all documents, certificates and instruments
    submitted to us as copies and the legal capacity to sign of all
    individuals executing such documents, certificates and instruments.

              We have assumed that each party has duly authorized, executed
    and delivered each of the Trust Agreements, Registration Statement and
    other instruments, certificates, agreements, documents executed in
    connection with the transactions contemplated thereby (collectively "UIT
    Documents") to which it is a party.

              We have assumed that each party is duly qualified and has full
    power and authority to perform its obligations under the UIT Documents and
    the transactions contemplated by the UIT Documents. 

              We have assumed that each party complied with all orders, rules,
    regulations applicable to it or in connection with the UIT Documents or
    the transactions contemplated thereby.  We have further assumed that no
    party  to the transaction contemplated by the UIT Documents is subject to
    any statute, rule or regulation, or to any impediment to which contracting
    parties are not generally subject, which requires such party to obtain the
    authorization or consent of, or to register or make a declaration or
    filing with, or inquiry of any governmental agency or regulatory
    authority.

              Based on such examination and assumptions, we are of the opinion
    that the Units when sold by the Depositor and purchased and paid for by
    the Unitholder, duly executed, authenticated and delivered in accordance
    with the Trust Agreement and the Registration Statement relating to such
    Units, the Units will be (i) validly issued, fully paid and nonassessable
    and (iii) legal, valid and binding obligations of the Trust, and the
    holders of the Units will be entitled to the benefits of the related Trust
    Agreement, except as enforcement thereof may be limited by applicable
    bankruptcy, insolvency, reorganization, arrangement, fraudulent
    conveyance, moratorium or other laws relating to or affecting the
    enforcement of creditors' rights generally and general principles of
    equity regardless of whether such enforceability is considered in a
    proceeding in equity or at law.  

              We hereby consent to the filing of this opinion as an exhibit to
    the Registration Statement and further consent to the use of our name
    wherever appearing in the Registration Statement, including the Prospectus
    and forms of Prospectus Supplements constituting a part thereof, as
    originally filed or as amended or supplemented.

                                       Very truly yours,



                                       Battle Fowler

    <PAGE>

                                       BATTLE FOWLER 
                                    75 EAST 55TH STREET 
                                 NEW YORK, NEW YORK 10022 
     


                                  (212) 856-7000


                                 October 28, 1994


    Bear, Stearns & Co. Inc.
    245 Park Avenue
    New York, New York 10167

              Re:  Insured Municipal Securities Trust, 25th Discount
                   Series                                           

    Gentlemen:

         We have acted as counsel for Bear Stearns & Co., Inc. as Depositor
    and Sponsor (the "Depositor") of Insured Municipal Securities Trust, 25th
    Discount Series (the "Trust") in connection with the preparation of Post-
    Effective Amendment No. 8 to Registration Statement on Form S-6 (the
    "Registration Statement") filed pursuant to Rule 24e-2 of the Securities
    Act of 1933 registering the issuance by the Trust of 1,462 units of
    fractional undivided interest of the Trust (the "Units"). Such Units were
    originally issued by the Trust on November 6, 1986 and are being
    registered under the Registration Statement for resale by the Depositor of
    the Trust.  All terms specifically defined in such Registration Statement
    shall have the same meaning when used herein.

         We have examined copies of the following documents (a) the Trust
    Indenture and Reference Trust Agreement, dated November 6, 1986, relating
    to the Trust among the Depositor, United States Trust Company of New York,
    as Trustee, and Standard & Poor's Corporation, as Evaluator (the "Trust
    Agreements") pursuant to which the Units were originally issued; (b) the
    Notification of Registration on Form N-8A and the Registration Statement
    on Form N-8B-2, as amended, relating to the Trust, as filed with the
    Securities and Exchange Commission (the "Commission") pursuant to the
    Investment Company Act of 1940 (the "1940 Act"); (c) the Registration
    Statement on Form S-6 (Registration No. 33-09512) filed with the
    Commission pursuant to the Securities Act of 1933 (the "1933 Act"), and
    Amendment No. 1 thereto (said Registration Statement, as amended by said
    Amendment No. 1 being herein called the "Registration Statement") and all
    subsequent Post-Effective Amendments to the Registration Statement as
    filed with the Commission; (d) the proposed form of final Prospectus (the
    "Prospectus") relating to the Units, which is expected to be filed with
    the Commission this day; (e) certified resolutions of the Executive
    Committee of the Depositor authorizing the execution and delivery by the
    Depositor of the Trust Agreements and the consummation of the transactions
    contemplated thereby; (f) the Certificate of Incorporation and By-Laws of
    the Depositor,  each certified to by an authorized officer of the
    Depositor as of a recent date; and (g) a certificate of an authorized
    officer of the Depositor with respect to certain factual matters contained
    therein.

              We have also examined the Application for Orders of Exemption
    from certain provisions of Sections 14(a) and 22(d) of the 1940 Act and
    Rules 19b-1 and 22c-1 thereunder, and the First Amendment thereto, and the
    Application for Orders of Exemption from certain provisions of
    Sections 11(a) and 11(c) and 22(d) of the 1940 Act, which have been filed
    with the Commission by Bear, Stearns & Co. Inc. on behalf of New York
    Municipal Trust, Series 1 and Subsequent Series, and the related exemptive
    Orders issued on November 8, 1978 and April 29, 1981 and the Application
    for an Amended Order of Exemption from certain provisions of Section 11(a)
    of the 1940 Act, which has been filed with the Commission by the
    Depositors; the Trusts; Municipal Securities Trust, Series 1 (and
    Subsequent Series (including Insured Municipal Securities Trust, Series 1
    (and Subsequent Series) and 5th Discount Series (and Subsequent Series));
    New York Municipal Trust, Series 1 (and Subsequent Series); and A
    Corporate Trust, Series 1 (and Subsequent Series) on October 2, 1990 and
    as amended thereafter and the related Exemptive Order (IC-18290) issued by
    the Commission on August 28, 1991.  

              In rendering this opinion we have assumed the genuineness of all
    signatures, the authenticity and completeness of all documents,
    certificates and instruments submitted to us as originals, the conformity
    with the originals of all documents, certificates and instruments
    submitted to us as copies and the legal capacity to sign of all
    individuals executing such documents, certificates and instruments.

              We have assumed that each party has duly authorized, executed
    and delivered each of the Trust Agreements, Registration Statement and
    other instruments, certificates, agreements, documents executed in
    connection with the transactions contemplated thereby (collectively "UIT
    Documents") to which it is a party.

              We have assumed that each party is duly qualified and has full
    power and authority to perform its obligations under the UIT Documents and
    the transactions contemplated by the UIT Documents. 

              We have assumed that each party complied with all orders, rules,
    regulations applicable to it or in connection with the UIT Documents or
    the transactions contemplated thereby.  We have further assumed that no
    party  to the transaction contemplated by the UIT Documents is subject to
    any statute, rule or regulation, or to any impediment to which contracting
    parties are not generally subject, which requires such party to obtain the
    authorization or consent of, or to register or make a declaration or
    filing with, or inquiry of any governmental agency or regulatory
    authority.

              Based on such examination and assumptions, we are of the opinion
    that the Units when sold by the Depositor and purchased and paid for by
    the Unitholder, duly executed, authenticated and delivered in accordance
    with the Trust Agreement and the Registration Statement relating to such
    Units, the Units will be (i) validly issued, fully paid and nonassessable
    and (iii) legal, valid and binding obligations of the Trust, and the
    holders of the Units will be entitled to the benefits of the related Trust
    Agreement, except as enforcement thereof may be limited by applicable
    bankruptcy, insolvency, reorganization, arrangement, fraudulent
    conveyance, moratorium or other laws relating to or affecting the
    enforcement of creditors' rights generally and general principles of
    equity regardless of whether such enforceability is considered in a
    proceeding in equity or at law.  

              We hereby consent to the filing of this opinion as an exhibit to
    the Registration Statement and further consent to the use of our name
    wherever appearing in the Registration Statement, including the Prospectus
    and forms of Prospectus Supplements constituting a part thereof, as
    originally filed or as amended or supplemented.

                                       Very truly yours,



                                       Battle Fowler 

    <PAGE>


                                       BATTLE FOWLER 
                                    75 EAST 55TH STREET 
                                 NEW YORK, NEW YORK 10022 
   
                                  (212) 856-7000


                                 October 28, 1994


    Bear, Stearns & Co. Inc.
    245 Park Avenue
    New York, New York 10167

              Re:  Insured Municipal Securities Trust, 26th Discount
                   Series                                           

    Gentlemen:

         We have acted as counsel for Bear Stearns & Co., Inc. as Depositor
    and Sponsor (the "Depositor") of Insured Municipal Securities Trust, 26th
    Discount Series (the "Trust") in connection with the preparation of Post-
    Effective Amendment No. 8 to Registration Statement on Form S-6 (the
    "Registration Statement") filed pursuant to Rule 24e-2 of the Securities
    Act of 1933 registering the issuance by the Trust of 972 units of
    fractional undivided interest of the Trust (the "Units"). Such Units were
    originally issued by the Trust on December 18, 1986 and are being
    registered under the Registration Statement for resale by the Depositor of
    the Trust.  All terms specifically defined in such Registration Statement
    shall have the same meaning when used herein.

         We have examined copies of the following documents (a) the Trust
    Indenture and Reference Trust Agreement, dated December 18, 1986, relating
    to the Trust among the Depositor, United States Trust Company of New York,
    as Trustee, and Standard & Poor's Corporation, as Evaluator (the "Trust
    Agreements") pursuant to which the Units were originally issued; (b) the
    Notification of Registration on Form N-8A and the Registration Statement
    on Form N-8B-2, as amended, relating to the Trust, as filed with the
    Securities and Exchange Commission (the "Commission") pursuant to the
    Investment Company Act of 1940 (the "1940 Act"); (c) the Registration
    Statement on Form S-6 (Registration No. 33-10166) filed with the
    Commission pursuant to the Securities Act of 1933 (the "1933 Act"), and
    Amendment No. 1 thereto (said Registration Statement, as amended by said
    Amendment No. 1 being herein called the "Registration Statement") and all
    subsequent Post-Effective Amendments to the Registration Statement as
    filed with the Commission; (d) the proposed form of final Prospectus (the
    "Prospectus") relating to the Units, which is expected to be filed with
    the Commission this day; (e) certified resolutions of the Executive
    Committee of the Depositor authorizing the execution and delivery by the
    Depositor of the Trust Agreements and the consummation of the transactions
    contemplated thereby; (f) the Certificate of Incorporation and By-Laws of
    the Depositor,  each certified to by an authorized officer of the
    Depositor as of a recent date; and (g) a certificate of an authorized
    officer of the Depositor with respect to certain factual matters contained
    therein.

              We have also examined the Application for Orders of Exemption
    from certain provisions of Sections 14(a) and 22(d) of the 1940 Act and
    Rules 19b-1 and 22c-1 thereunder, and the First Amendment thereto, and the
    Application for Orders of Exemption from certain provisions of
    Sections 11(a) and 11(c) and 22(d) of the 1940 Act, which have been filed
    with the Commission by Bear, Stearns & Co. Inc. on behalf of New York
    Municipal Trust, Series 1 and Subsequent Series, and the related exemptive
    Orders issued on November 8, 1978 and April 29, 1981 and the Application
    for an Amended Order of Exemption from certain provisions of Section 11(a)
    of the 1940 Act, which has been filed with the Commission by the
    Depositors; the Trusts; Municipal Securities Trust, Series 1 (and
    Subsequent Series (including Insured Municipal Securities Trust, Series 1
    (and Subsequent Series) and 5th Discount Series (and Subsequent Series));
    New York Municipal Trust, Series 1 (and Subsequent Series); and A
    Corporate Trust, Series 1 (and Subsequent Series) on October 2, 1990 and
    as amended thereafter and the related Exemptive Order (IC-18290) issued by
    the Commission on August 28, 1991.  

              In rendering this opinion we have assumed the genuineness of all
    signatures, the authenticity and completeness of all documents,
    certificates and instruments submitted to us as originals, the conformity
    with the originals of all documents, certificates and instruments
    submitted to us as copies and the legal capacity to sign of all
    individuals executing such documents, certificates and instruments.

              We have assumed that each party has duly authorized, executed
    and delivered each of the Trust Agreements, Registration Statement and
    other instruments, certificates, agreements, documents executed in
    connection with the transactions contemplated thereby (collectively "UIT
    Documents") to which it is a party.

              We have assumed that each party is duly qualified and has full
    power and authority to perform its obligations under the UIT Documents and
    the transactions contemplated by the UIT Documents. 

              We have assumed that each party complied with all orders, rules,
    regulations applicable to it or in connection with the UIT Documents or
    the transactions contemplated thereby.  We have further assumed that no
    party  to the transaction contemplated by the UIT Documents is subject to
    any statute, rule or regulation, or to any impediment to which contracting
    parties are not generally subject, which requires such party to obtain the
    authorization or consent of, or to register or make a declaration or
    filing with, or inquiry of any governmental agency or regulatory
    authority.

              Based on such examination and assumptions, we are of the opinion
    that the Units when sold by the Depositor and purchased and paid for by
    the Unitholder, duly executed, authenticated and delivered in accordance
    with the Trust Agreement and the Registration Statement relating to such
    Units, the Units will be (i) validly issued, fully paid and nonassessable
    and (iii) legal, valid and binding obligations of the Trust, and the
    holders of the Units will be entitled to the benefits of the related Trust
    Agreement, except as enforcement thereof may be limited by applicable
    bankruptcy, insolvency, reorganization, arrangement, fraudulent
    conveyance, moratorium or other laws relating to or affecting the
    enforcement of creditors' rights generally and general principles of
    equity regardless of whether such enforceability is considered in a
    proceeding in equity or at law.  

              We hereby consent to the filing of this opinion as an exhibit to
    the Registration Statement and further consent to the use of our name
    wherever appearing in the Registration Statement, including the Prospectus
    and forms of Prospectus Supplements constituting a part thereof, as
    originally filed or as amended or supplemented.

                                       Very truly yours,



                                       Battle Fowler 



    KENNY S&P EVALUATION SERVICES
    A Division of Kenny Information Systems, Inc.

    65 Broadway
    New York, New York 10006-2511
    Telephone 212/770-4440
    Fax: 212/797-8681

    John R. Fitzgerald
    Vice President


                                  October 28, 1994

    Bear, Stearns & Co., Inc.
    245 Park Avenue
    New York, NY 10167


              RE:  Insured Municipal Securities Trust
                   22nd Discount Series


    Gentlemen:

               We  have examined the post-effective Amendment to  the
    Registration  Statement File No. 33-07253 for the above-captioned
    trust.  We hereby acknowledge that Kenny S&P Evaluation Services,
    a division of Kenny Information Systems, Inc. is currently acting
    as  the evaluator for the trust.  We hereby consent to the use in
    the  Amendment of the reference to Kenny S&P Evaluation Services,
    a division of Kenny Information Systems, Inc. as evaluator.

               In  addition,  we  hereby  confirm  that  the  ratings
    indicated  in  the above-referenced Amendment to the Registration
    Statement for the respective bonds comprising the trust portfolio
    are the ratings currently indicated in our KENNYBASE database.

              You are hereby authorized to file a copy of this letter
    with the Securities and Exchange Commission.

                                  Sincerely,



                                  John R. Fitzgerald


    JRF/cns
    <PAGE>
    KENNY S&P EVALUATION SERVICES
    A Division of Kenny Information Systems, Inc.

    65 Broadway
    New York, New York 10006-2511
    Telephone 212/770-4440
    Fax: 212/797-8681

    John R. Fitzgerald
    Vice President


                                  October 28, 1994

    Bear, Stearns & Co., Inc.
    245 Park Avenue
    New York, NY 10167

                 RE:    Insured Municipal Securities Trust
                        23rd Discount Series
    Gentlemen:

               We  have examined the post-effective Amendment to  the
    Registration  Statement File No. 33-07769 for the above-captioned
    trust.  We hereby acknowledge that Kenny S&P Evaluation Services,
    a division of Kenny Information Systems, Inc. is currently acting
    as  the evaluator for the trust.  We hereby consent to the use in
    the  Amendment of the reference to Kenny S&P Evaluation  Services
    as evaluator.

               In  addition,  we  hereby  confirm  that  the  ratings
    indicated  in  the above-referenced Amendment to the Registration
    Statement for the respective bonds comprising the trust portfolio
    are the ratings currently indicated in our KENNYBASE database.

              You are hereby authorized to file a copy of this letter
    with the Securities and Exchange Commission.

                                  Sincerely,



                                  John R. Fitzgerald


    JRF/cns
    <PAGE>
    KENNY S&P EVALUATION SERVICES
    A Division of Kenny Information Systems, Inc.

    65 Broadway
    New York, New York 10006-2511
    Telephone 212/770-4440
    Fax: 212/797-8681

    John R. Fitzgerald
    Vice President


                                  October 28, 1994

    Bear, Stearns & Co., Inc.
    245 Park Avenue
    New York, NY 10167

                 RE:    Insured Municipal Securities Trust
                        24th Discount Series
    Gentlemen:

               We  have examined the post-effective Amendment to  the
    Registration  Statement File No. 33-08700 for the above-captioned
    trust.  We hereby acknowledge that Kenny S&P Evaluation Services,
    a division of Kenny Information Systems, Inc. is currently acting
    as  the evaluator for the trust.  We hereby consent to the use in
    the  Amendment of the reference to Kenny S&P Evaluation  Services
    as evaluator.

               In  addition,  we  hereby  confirm  that  the  ratings
    indicated  in  the above-referenced Amendment to the Registration
    Statement for the respective bonds comprising the trust portfolio
    are the ratings currently indicated in our KENNYBASE database.

              You are hereby authorized to file a copy of this letter
    with the Securities and Exchange Commission.

                                  Sincerely,



                                  John R. Fitzgerald


    JRF/cns
    <PAGE>
    KENNY S&P EVALUATION SERVICES
    A Division of Kenny Information Systems, Inc.

    65 Broadway
    New York, New York 10006-2511
    Telephone 212/770-4440
    Fax: 212/797-8681

    John R. Fitzgerald
    Vice President


                                  October 28, 1994

    Bear, Stearns & Co., Inc.
    245 Park Avenue
    New York, NY 10167

                 RE:    Insured Municipal Securities Trust
                        25th Discount Series
    Gentlemen:

               We  have examined the post-effective Amendment to  the
    Registration  Statement File No. 33-09512 for the above-captioned
    trust.  We hereby acknowledge that Kenny S&P Evaluation Services,
    a division of Kenny Information Systems, Inc. is currently acting
    as  the evaluator for the trust.  We hereby consent to the use in
    the  Amendment of the reference to Kenny S&P Evaluation  Services
    as evaluator.

               In  addition,  we  hereby  confirm  that  the  ratings
    indicated  in  the above-referenced Amendment to the Registration
    Statement for the respective bonds comprising the trust portfolio
    are the ratings currently indicated in our KENNYBASE database.

              You are hereby authorized to file a copy of this letter
    with the Securities and Exchange Commission.

                                  Sincerely,



                                  John R. Fitzgerald


    JRF/cns
    <PAGE>
    KENNY S&P EVALUATION SERVICES
    A Division of Kenny Information Systems, Inc.

    65 Broadway
    New York, New York 10006-2511
    Telephone 212/770-4440
    Fax: 212/797-8681

    John R. Fitzgerald
    Vice President


                                   October 28, 1994

    Bear, Stearns & Co., Inc.
    245 Park Avenue
    New York, NY 10167

                 RE:    Insured Municipal Securities Trust
                        26th Discount Series

    Gentlemen:

               We  have examined the post-effective Amendment to  the
    Registration  Statement File No. 33-10166 for the above-captioned
    trust.  We hereby acknowledge that Kenny S&P Evaluation Services,
    a division of Kenny Information Systems, Inc. is currently acting
    as  the evaluator for the trust.  We hereby consent to the use in
    the  Amendment of the reference to Kenny S&P Evaluation  Services
    as evaluator.

               In  addition,  we  hereby  confirm  that  the  ratings
    indicated  in  the above-referenced Amendment to the Registration
    Statement for the respective bonds comprising the trust portfolio
    are the ratings currently indicated in our KENNYBASE database.

              You are hereby authorized to file a copy of this letter
    with the Securities and Exchange Commission.

                                  Sincerely,



                                  John R. Fitzgerald


    JRF/cns
<PAGE>
                                          October 28, 1994
 Standard & Poor's Corporation
 Bond Insurance Administration
 25 Broadway
 New York, New York 10004-1064
 Telephone 212/208-0138
 FAX 212/208-8262




 Bear Stearns & Co., Inc.
 245 Park Avenue
 New York, New York  10167

 Re:  Insured Municipal Securities Trust, 22nd Discount Series

      We have received the post-effective amendment to the registration
 statement SEC file number 33-07253 for the above captioned trust.

      Since the portfolio is composed solely of securities covered by bond
 insurance policies that insure against default in the payment of principal
 and interest on the securities for so long as they remain outstanding and
 such policies have been issued by one or more insurance companies which
 have been assigned "AAA" claims paying ability ratings by S&P, we reaffirm
 the assignment of a "AAA" rating to the units of the trust and a "AAA"
 rating to the securities contained in the trust.

      You have permission to use the name of Standard & Poor's Corporation
 and the above-assigned ratings in connection with your dissemination of
 information relating to these units, provided that it is understood that
 the ratings are not "market" ratings nor recommendations to buy, hold, or
 sell the units of the trust or the securities in the trust.  Further, it
 should be understood that the rating on the units does not take into
 account the extent to which fund expenses or portfolio asset sales for
 less than the fund's purchase price will reduce payment to the unit
 holders of the interest and principal required to be paid on the portfolio
 assets.  S&P reserves the right to advise its own clients, subscribers,
 and the public of the ratings.  S&P relies on the sponsor and its counsel,
 accountants, and other experts for the accuracy and completeness of the
 information submitted in connection with the ratings.  S&P does not
 independently verify the truth or accuracy of any such information.

      This letter evidences our consent to the use of the name of Standard
 & Poor's Corporation in connection with the rating assigned to the units
 in the amendment referred to above.  However, this letter should not be
 construed as a consent by us, within the meaning of Section 7 of the
 Securities Act of 1933, to the use of the name of Standard & Poor's
 Corporation in connection with the ratings assigned to the securities
 contained in the trust.  You are hereby authorized to file a copy this
 letter with the Securities and Exchange Commission.

      We are pleased to have had the opportunity to be of service to you. 
 If we can be of further help, please do not hesitate to call upon us.

                                   Sincerely,



                                   Vincent S. Orgo


 /mc

 <PAGE>
                                    October 28, 1994
 Standard & Poor's Corporation
 Bond Insurance Administration
 25 Broadway
 New York, New York 10004-1064
 Telephone 212/208-0138
 FAX 212/208-8262




 Bear Stearns & Co., Inc.
 245 Park Avenue
 New York, New York  10167

 Re:  Insured Municipal Securities Trust, 23rd Discount Series

      We have received the post-effective amendment to the registration
 statement SEC file number 33-07769 for the above captioned trust.

      Since the portfolio is composed solely of securities covered by bond
 insurance policies that insure against default in the payment of principal
 and interest on the securities for so long as they remain outstanding and
 such policies have been issued by one or more insurance companies which
 have been assigned "AAA" claims paying ability ratings by S&P, we reaffirm
 the assignment of a "AAA" rating to the units of the trust and a "AAA"
 rating to the securities contained in the trust.

      You have permission to use the name of Standard & Poor's Corporation
 and the above-assigned ratings in connection with your dissemination of
 information relating to these units, provided that it is understood that
 the ratings are not "market" ratings nor recommendations to buy, hold, or
 sell the units of the trust or the securities in the trust.  Further, it
 should be understood that the rating on the units does not take into
 account the extent to which fund expenses or portfolio asset sales for
 less than the fund's purchase price will reduce payment to the unit
 holders of the interest and principal required to be paid on the portfolio
 assets.  S&P reserves the right to advise its own clients, subscribers,
 and the public of the ratings.  S&P relies on the sponsor and its counsel,
 accountants, and other experts for the accuracy and completeness of the
 information submitted in connection with the ratings.  S&P does not
 independently verify the truth or accuracy of any such information.

      This letter evidences our consent to the use of the name of Standard
 & Poor's Corporation in connection with the rating assigned to the units
 in the amendment referred to above.  However, this letter should not be
 construed as a consent by us, within the meaning of Section 7 of the
 Securities Act of 1933, to the use of the name of Standard & Poor's
 Corporation in connection with the ratings assigned to the securities
 contained in the trust.  You are hereby authorized to file a copy this
 letter with the Securities and Exchange Commission.

      We are pleased to have had the opportunity to be of service to you. 
 If we can be of further help, please do not hesitate to call upon us.

                                   Sincerely,


                                   Vincent S. Orgo
 /mc


 <PAGE>

                                    October 28, 1994
 Standard & Poor's Corporation
 Bond Insurance Administration
 25 Broadway
 New York, New York 10004-1064
 Telephone 212/208-0138
 FAX 212/208-8262




 Bear Stearns & Co., Inc.
 245 Park Avenue
 New York, New York  10167

 Re:  Insured Municipal Securities Trust, 24th Discount Series

      We have received the post-effective amendment to the registration
 statement SEC file number 33-08700 for the above captioned trust.

      Since the portfolio is composed solely of securities covered by bond
 insurance policies that insure against default in the payment of principal
 and interest on the securities for so long as they remain outstanding and
 such policies have been issued by one or more insurance companies which
 have been assigned "AAA" claims paying ability ratings by S&P, we reaffirm
 the assignment of a "AAA" rating to the units of the trust and a "AAA"
 rating to the securities contained in the trust.

      You have permission to use the name of Standard & Poor's Corporation
 and the above-assigned ratings in connection with your dissemination of
 information relating to these units, provided that it is understood that
 the ratings are not "market" ratings nor recommendations to buy, hold, or
 sell the units of the trust or the securities in the trust.  Further, it
 should be understood that the rating on the units does not take into
 account the extent to which fund expenses or portfolio asset sales for
 less than the fund's purchase price will reduce payment to the unit
 holders of the interest and principal required to be paid on the portfolio
 assets.  S&P reserves the right to advise its own clients, subscribers,
 and the public of the ratings.  S&P relies on the sponsor and its counsel,
 accountants, and other experts for the accuracy and completeness of the
 information submitted in connection with the ratings.  S&P does not
 independently verify the truth or accuracy of any such information.

      This letter evidences our consent to the use of the name of Standard
 & Poor's Corporation in connection with the rating assigned to the units
 in the amendment referred to above.  However, this letter should not be
 construed as a consent by us, within the meaning of Section 7 of the
 Securities Act of 1933, to the use of the name of Standard & Poor's
 Corporation in connection with the ratings assigned to the securities
 contained in the trust.  You are hereby authorized to file a copy this
 letter with the Securities and Exchange Commission.

      We are pleased to have had the opportunity to be of service to you. 
 If we can be of further help, please do not hesitate to call upon us.

                                   Sincerely,


                                   Vincent S. Orgo

 /mc


 <PAGE>

                                    October 28, 1994
 Standard & Poor's Corporation
 Bond Insurance Administration
 25 Broadway
 New York, New York 10004-1064
 Telephone 212/208-0138
 FAX 212/208-8262




 Bear Stearns & Co., Inc.
 245 Park Avenue
 New York, New York  10167

 Re:  Insured Municipal Securities Trust, 25th Discount Series

      We have received the post-effective amendment to the registration
 statement SEC file number 33-09512 for the above captioned trust.

      Since the portfolio is composed solely of securities covered by bond
 insurance policies that insure against default in the payment of principal
 and interest on the securities for so long as they remain outstanding and
 such policies have been issued by one or more insurance companies which
 have been assigned "AAA" claims paying ability ratings by S&P, we reaffirm
 the assignment of a "AAA" rating to the units of the trust and a "AAA"
 rating to the securities contained in the trust.

      You have permission to use the name of Standard & Poor's Corporation
 and the above-assigned ratings in connection with your dissemination of
 information relating to these units, provided that it is understood that
 the ratings are not "market" ratings nor recommendations to buy, hold, or
 sell the units of the trust or the securities in the trust.  Further, it
 should be understood that the rating on the units does not take into
 account the extent to which fund expenses or portfolio asset sales for
 less than the fund's purchase price will reduce payment to the unit
 holders of the interest and principal required to be paid on the portfolio
 assets.  S&P reserves the right to advise its own clients, subscribers,
 and the public of the ratings.  S&P relies on the sponsor and its counsel,
 accountants, and other experts for the accuracy and completeness of the
 information submitted in connection with the ratings.  S&P does not
 independently verify the truth or accuracy of any such information.

      This letter evidences our consent to the use of the name of Standard
 & Poor's Corporation in connection with the rating assigned to the units
 in the amendment referred to above.  However, this letter should not be
 construed as a consent by us, within the meaning of Section 7 of the
 Securities Act of 1933, to the use of the name of Standard & Poor's
 Corporation in connection with the ratings assigned to the securities
 contained in the trust.  You are hereby authorized to file a copy this
 letter with the Securities and Exchange Commission.

      We are pleased to have had the opportunity to be of service to you. 
 If we can be of further help, please do not hesitate to call upon us.

                                   Sincerely,


                                   Vincent S. Orgo
 /mc

 <PAGE>

                                   October 28, 1994
 Standard & Poor's Corporation
 Bond Insurance Administration
 25 Broadway
 New York, New York 10004-1064
 Telephone 212/208-0138
 FAX 212/208-8262




 Bear Stearns & Co., Inc.
 245 Park Avenue
 New York, New York  10167

 Re:  Insured Municipal Securities Trust, 26th Discount Series

      We have received the post-effective amendment to the registration
 statement SEC file number 33-10166 for the above captioned trust.

      Since the portfolio is composed solely of securities covered by bond
 insurance policies that insure against default in the payment of principal
 and interest on the securities for so long as they remain outstanding and
 such policies have been issued by one or more insurance companies which
 have been assigned "AAA" claims paying ability ratings by S&P, we reaffirm
 the assignment of a "AAA" rating to the units of the trust and a "AAA"
 rating to the securities contained in the trust.

      You have permission to use the name of Standard & Poor's Corporation
 and the above-assigned ratings in connection with your dissemination of
 information relating to these units, provided that it is understood that
 the ratings are not "market" ratings nor recommendations to buy, hold, or
 sell the units of the trust or the securities in the trust.  Further, it
 should be understood that the rating on the units does not take into
 account the extent to which fund expenses or portfolio asset sales for
 less than the fund's purchase price will reduce payment to the unit
 holders of the interest and principal required to be paid on the portfolio
 assets.  S&P reserves the right to advise its own clients, subscribers,
 and the public of the ratings.  S&P relies on the sponsor and its counsel,
 accountants, and other experts for the accuracy and completeness of the
 information submitted in connection with the ratings.  S&P does not
 independently verify the truth or accuracy of any such information.

      This letter evidences our consent to the use of the name of Standard
 & Poor's Corporation in connection with the rating assigned to the units
 in the amendment referred to above.  However, this letter should not be
 construed as a consent by us, within the meaning of Section 7 of the
 Securities Act of 1933, to the use of the name of Standard & Poor's
 Corporation in connection with the ratings assigned to the securities
 contained in the trust.  You are hereby authorized to file a copy this
 letter with the Securities and Exchange Commission.

      We are pleased to have had the opportunity to be of service to you. 
 If we can be of further help, please do not hesitate to call upon us.

                                   Sincerely,


                                   Vincent S. Orgo


 /mc





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