1933 ACT FILE NO.:  333-_____
                                                   1940 ACT FILE NO.:  811-21056
                                                               CIK NO.:  1292793

                       SECURITIES AND EXCHANGE COMMISSION
                             WASHINGTON, D.C.  20549

                                    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:       ADVISOR'S DISCIPLINED TRUST, SERIES 21

B.  Name of depositor:         FIXED INCOME SECURITIES, L.P.

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

                              18925 Base Camp Road
                            Monument, Colorado  80132

D.  Name and complete address of agent for service:

                                                 WITH A COPY TO:
            CRAIG FIDLER
           General Counsel                       MARK J. KNEEDY
     Fixed Income Securities, L.P.           Chapman and Cutler LLP
         18925 Base Camp Road                111 West Monroe Street
      Monument, Colorado  80132           Chicago, Illinois  60603-4080

E.  Title of securities being registered:  Units of undivided beneficial
    interest in the trust

F.  Approximate date of proposed public offering:

  AS SOON AS PRACTICABLE AFTER THE EFFECTIVE DATE OF THE REGISTRATION STATEMENT
[ ] Check box if it is proposed that this filing will become effective
    on _______, 2004 at _____ pursuant to Rule 487.

- -------------------------------------------------------------------------------
The registrant hereby amends this Registration Statement on such date or dates
as may be necessary to delay its effective date until the registrant shall file
a further amendment which specifically states that this Registration Statement
shall thereafter become effective in accordance with Section 8(a) of the
Securities Act of 1933 or until the Registration Statement shall become
effective on such date as the Commission, acting pursuant to said Section 8(a)
may determine.







  The information in this prospectus is not complete and may be changed. No one
   may sell units of the trust until the registration statement filed with the
Securities and Exchange Commission is effective. This prospectus is not an offer
to sell units and is not soliciting an offer to buy units in any state where the
                         offer or sale is not permitted.

                 PRELIMINARY PROSPECTUS DATED SEPTEMBER 30, 2004
                              SUBJECT TO COMPLETION









GLOBAL BASIC MATERIALS PORTFOLIO, SERIES 1


(ADVISOR'S DISCIPLINED TRUST, SERIES 21)





                            A portfolio of stocks of
                         foreign and domestic companies
                          in the basic materials sector
                               seeking income and
                              capital appreciation







                                   PROSPECTUS

                                OCTOBER __, 2004




        [LOGO]
                                        As with any investment, the Securities
       ADVISOR'S                        and Exchange Commission has not approved
   ASSET MANAGEMENT                     or disapproved of these securities or
                                        passed upon the adequacy or accuracy of
  A DIVISION OF FIXED                   this prospectus.  Any contrary
INCOME SECURITIES, L.P.                 representation is a criminal offense.





- ------------------
INVESTMENT SUMMARY
- ------------------


                              INVESTMENT OBJECTIVE

  The trust seeks to provide dividend income and capital appreciation.

                          PRINCIPAL INVESTMENT STRATEGY

  The trust seeks to provide dividend income and capital appreciation by
investing in a diversified portfolio of common stocks of foreign and domestic
companies within the basic materials sector.  Basic materials companies are
engaged in the manufacture, mining, processing, or distribution of raw materials
and intermediate goods used in the industrial sector.  These companies may be
involved in the production of chemicals, construction materials, glass, paper
products, forest products and related packaging products, metals, minerals and
textiles.

  In selecting the securities for the portfolio, we<FN1>* considered current
dividend yield, diversification of the portfolio among global regions and basic
materials sub-sectors, historical consistency of dividends, and the potential
for dividend growth and capital appreciation.  The portfolio is diversified
among stocks of companies located throughout the world, including the United
States.  Of course, as with any similar investment, there can be no assurance
that the objective of the trust will be achieved.


                                 PRINCIPAL RISKS

  As with all investments, you can lose money by investing in this trust.  The
trust also might not perform as well as you expect.  This can happen for reasons
such as these:

*  SECURITY PRICES WILL FLUCTUATE.  The value of your investment may fall over
   time.

*  THE ISSUER OF A SECURITY MAY BE UNWILLING OR UNABLE TO MAKE DIVIDEND PAYMENTS
   IN THE FUTURE.  This may reduce the level of dividends the trust receives
   which would reduce your income and cause the value of your units to fall.

*  THE FINANCIAL CONDITION OF AN ISSUER MAY WORSEN OR ITS CREDIT RATINGS MAY
   DROP, RESULTING IN A REDUCTION IN THE VALUE OF YOUR UNITS.  This may occur at
   any point in time, including during the primary offering period.

*  The trust is considered to be concentrated in securities issued by companies
   in the basic materials sector.  NEGATIVE DEVELOPMENTS IN THE BASIC MATERIALS
   SECTOR WILL AFFECT THE VALUE OF YOUR INVESTMENT MORE THAN WOULD BE THE CASE
   IN A MORE DIVERSIFIED INVESTMENT.

*  STOCKS OF FOREIGN COMPANIES HELD BY THE TRUST PRESENT RISKS BEYOND THOSE OF
   U.S. ISSUERS. These risks may include market and political factors related to
   the company's foreign market, international trade conditions, less
   regulation, smaller or less liquid markets, increased volatility, differing
   accounting practices and changes in the value of foreign currencies.

*  WE DO NOT ACTIVELY MANAGE THE PORTFOLIO.  Except in limited circumstances,
   the trust will generally hold, and continue to buy, shares of the same
   securities even if their market value declines.


- --------------------
<FN1>* "FIS," "we" and related terms mean Fixed Income Securities, L.P. unless
 the context clearly suggests otherwise.


2     Investment Summary


WHO SHOULD INVEST

  You should consider this investment if you want:

  *  to own a defined portfolio of stocks of foreign and domestic basic
     materials companies.

  *  the potential to receive monthly distributions of income.

  *  the potential for capital appreciation.

  You should not consider this investment if you:

  *  are uncomfortable with the risks of an unmanaged investment in common
     stocks.

  *  are uncomfortable investing in foreign companies.

  *  seek capital preservation.




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

                              ESSENTIAL INFORMATION
                              ---------------------

                                            
          UNIT PRICE AT INCEPTION                              $10.000

          INCEPTION DATE                              October __, 2004
          TERMINATION DATE                              April __, 2010

          ESTIMATED NET ANNUAL DISTRIBUTIONS
          First year                                $________ per unit
          Subsequent years                          $________ per unit

          DISTRIBUTION DATES                    Last day of each month
          RECORD DATES                          15th day of each month

          INITIAL DISTRIBUTION DATE                  November 30, 2004
          INITIAL RECORD DATE                        November 15, 2004

          CUSIP NUMBERS
          Cash distributions                                007582____
          Reinvested distributions                          007582____

          TICKER SYMBOL                                       ________

          MINIMUM INVESTMENT                          $1,000/100 units

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



                                FEES AND EXPENSES

  The amounts below are estimates of the direct and indirect expenses that you
may incur based on a $10 unit price.  Actual expenses may vary.



                                   AS A %          AMOUNT
                                  OF $1,000        PER 100
SALES FEE                         INVESTED          UNITS
                                  ------------------------
                                            

Initial sales fee                   1.00%           $10.00
Deferred sales fee                  3.95             39.50
                                   -------         -------
Maximum sales fee                   4.95%           $49.50
                                   =======         =======

ORGANIZATION COSTS                      %           $
                                   =======         =======


                                   AS A %          AMOUNT
ANNUAL                             OF NET          PER 100
OPERATING EXPENSES                 ASSETS           UNITS
                                  ------------------------
                                            
Trustee fee & expenses             0.158%            $1.50
Supervisory, evaluation
  and administration fees          0.106              1.00
                                   -------         -------
Total                              0.264%            $2.50
                                   =======         =======


  The initial sales fee is the difference between the total sales fee (4.95% of
the unit offering price) and the remaining deferred sales fee.  The deferred
sales fee is fixed at $0.395 per unit and is paid in three monthly installments
beginning May ___, 2005.

                                     EXAMPLE

  This example helps you compare the cost of this trust with other unit trusts
and mutual funds.  In the example we assume that the expenses do not change and
that the trust's annual return is 5%.  Your actual returns and expenses will
vary.  Based on these assumptions, you would pay these expenses for every
$10,000 you invest in the trust:

          1 year                               $_____
          3 years                              $_____
          5 years                              $_____
          5 1/2 years (life of trust)          $_____

  These amounts are the same regardless of whether you sell your investment at
the end of a period or continue to hold your investment.


                                                        Investment Summary     3




GLOBAL BASIC MATERIALS PORTFOLIO, SERIES 1
(ADVISOR'S DISCIPLINED TRUST, SERIES 21)
PORTFOLIO
AS OF THE TRUST INCEPTION DATE, OCTOBER ___, 2004


                                                   PERCENTAGE OF               MARKET           COST OF
  NUMBER                                         AGGREGATE OFFERING           VALUE PER       SECURITIES
OF SHARES          ISSUER                              PRICE                   SHARE(1)       TO TRUST(2)
                                                                                  







- ---------                                             --------                                 ----------
                                                       100.00%                                  $
=========                                             ========                                 ==========


<FN>
Notes to Portfolio

(1)  Securities are represented by contracts to purchase securities.  The cost
     of each security is based on the most recent closing sale price of each
     security as of the close of regular trading on the New York Stock Exchange
     on the business day prior to the trust's inception date.

(2)  The cost of the securities to the sponsor and the sponsor's profit or
     (loss) (which is the difference between the cost of the securities to the
     sponsor and the cost of the securities to the trust) are $__________ and
     ($________) respectively.

(3)  This is a security issued by a foreign company that trades on a U.S.
     securities exchange.








4     Investment Summary



  THE SECURITIES

  A brief description of each of the issuers of the portfolio securities
appears below.






















                                                        Investment Summary     5


- -----------------------------
UNDERSTANDING YOUR INVESTMENT
- -----------------------------


                                HOW TO BUY UNITS

  You can buy units of the trust on any business day the New York Stock
Exchange is open by contacting your financial professional.  Unit prices are
available daily on the Internet at WWW.AAMUNITTRUST.COM.  The public offering
price of units includes:

  *  the net asset value per unit plus

  *  organization costs plus

  *  the sales fee.

  The "net asset value per unit" is the value of the securities, cash and other
assets in the trust reduced by the liabilities of the trust divided by the total
units outstanding.  We often refer to the public offering price of units as the
"offer price" or "purchase price."  We must receive your order to buy units
prior to the close of regular trading on the New York Stock Exchange (normally
4:00Ep.m. Eastern time) to give you the price for that day.  If we receive your
order after this time, you will receive the price computed on the next business
day.  Certain broker-dealers may charge a transaction or other fee for
processing unit purchase orders.

  VALUE OF THE SECURITIES.  We determine the value of the securities as of the
close of regular trading on the New York Stock Exchange on each day that
exchange is open.  During the initial offering period, the value of the
securities includes organization costs.

  Pricing the Securities.  We generally determine the value of securities using
the last sale price for securities traded on a national securities exchange or
the Nasdaq Stock Market.  For this purpose, the trustee provides us closing
prices from a reporting service approved by us.  In some cases we will price a
security based on the last asked or bid price in the over-the-counter market or
by using other recognized pricing methods.  We will only do this if a security
is not principally traded on a national securities exchange or the Nasdaq Stock
Market, or if the market quotes are unavailable or inappropriate.

  We determined the initial prices of the securities shown under "Portfolio" in
this prospectus as described above at the close of regular trading on the
New York Stock Exchange on the business day before the date of this prospectus.
On the first day we sell units we will compute the unit price as of the close of
regular trading on the New York Stock Exchange or the time the registration
statement filed with the Securities and Exchange Commission becomes effective,
if later.

  Organization Costs.  During the initial offering period, part of the value of
the securities represents an amount that will pay the costs of creating your
trust.  These costs include the costs of preparing the registration statement
and legal documents, federal and state registration fees, the initial fees and
expenses of the trustee and the initial audit.  Your trust will sell securities
to reimburse us for these costs at the end of the initial offering period or
after six months, if earlier.  The value of your units will decline when the
trust pays these costs.

  SALES FEE.  You pay a fee in connection with purchasing units.  We refer to
this fee as the "sales fee."  The total sales fee equals 4.95% of the public
offering price per unit at the time of purchase.   This is equivalent to 5.208%
of the net amount invested.  You pay the initial sales fee at the time you buy
units.  The initial sales fee is the difference between the total sales fee
(4.95% of the public offering price per unit) and the remaining


6     Understanding Your Investment


fixed dollar deferred sales fee.  The initial sales fee will be
approximately 1.00% of the public offering price per unit depending on the
public offering price per unit.  The deferred sales fee is fixed at $0.395 per
unit.  Your trust pays the deferred sales fee in equal monthly installments as
described on page 3.  If you redeem or sell your units prior to collection of
the total deferred sales fee, you will pay any remaining deferred sales fee upon
redemption or sale of your units.

  If you purchase units after the last deferred sales fee payment has been
assessed, your sales fee will consist of a one-time initial sales fee of 4.95%
of the public offering price (equivalent to 5.208% of the net amount invested).
The sales fee will be reduced by 1/2 of 1% on each October ___, commencing
October ___, 2005 to a minimum sales fee of 3.00%.

  REDUCING YOUR SALES FEE.  We offer a variety of ways for you to reduce the
fee you pay.  It is your financial professional's responsibility to alert us of
any discount when you order units.  Since the deferred sales fee is a fixed
dollar amount per unit, your trust must charge this fee per unit regardless of
any discounts.  However, if you are eligible to receive a discount such that
your total sales fee is less than the fixed dollar amount of the deferred sales
fee, we will credit you the difference between your total sales fee and this
fixed dollar fee at the time you buy units.

  Large Purchases.  You can reduce your sales fee by increasing the size of
your investment:

      IF YOU PURCHASE:        YOUR FEE WILL BE:
     ------------------------------------------

     Less than $50,000              4.95%
     $50,000 - $99,999              4.70
     $100,000 - $249,999            4.45
     $250,000 - $499,999            3.95
     $500,000 or more               2.95

  We apply these fees as a percent of the public offering price per unit at the
time of purchase.  We also apply the different purchase levels on a unit basis
using a $10 unit equivalent.  For example, if you purchase between 10,000 and
24,999 units, your fee is 4.45% of your public offering price per unit.

  You may AGGREGATE unit orders submitted by the same person for units of any
of the trusts we sponsor on any single day from any one broker-dealer to qualify
for a purchase level.  You can also include these orders as your own for
purposes of this aggregation:

  *  orders submitted by your spouse or minor children living in the same
     household and

  *  orders submitted by your trust estate or fiduciary accounts.

  The discounts described above apply during the initial offering period.

  Fee Accounts.  We waive a portion of the sales fee for purchases made through
registered investment advisers, certified financial planners or registered
broker-dealers who charge periodic fees in lieu of commissions or who charge for
financial planning or for investment advisory or asset management services or
provide these services as part of an investment account where a comprehensive
"wrap fee" is imposed.  Investors may purchase units of the trust in these
accounts at the public offering price less 3.25%.

  This discount applies during the initial offering period and in the secondary
market.  Certain fee account investors may be assessed transaction or other fees
on the purchase and/or redemption of units by their broker-dealer or other
processing organizations for providing certain transaction or


                                             Understanding Your Investment     7


account activities.  We reserve the right to limit or deny purchases of units in
fee accounts by investors or selling firms whose frequent trading activity is
determined to be detrimental to the trust.

  Employees.  We waive a portion of the sales fee for purchases made by
officers, directors and employees of the sponsor and its affiliates.  We also
waive a portion of the sales fee for purchases made by registered
representatives of selling firms and their family members (spouses, children and
parents).  These purchases may be made at the public offering price per unit
less the applicable regular dealer concession.  These discounts apply during the
initial offering period and in the secondary market.

  Exchange Option.  We waive a portion of the sales fee on units of the trust
offered in this prospectus if you buy your units with redemption or termination
proceeds from any of our other unit trusts.  You may also purchase units of the
trust offered in this prospectus at this reduced fee if you purchase your units
with termination proceeds from an unaffiliated unit trust.  The discounted
public offering price per unit for these transactions is equal to the regular
public offering price per unit less 1.00%.  However, if you invest redemption or
termination proceeds of $500,000 or more in units of the trust, the maximum
sales fee on your units will be limited to the maximum sales fee for the
applicable amount invested in the table under "Large Purchases" above.  Please
note that if you purchase units of the trust in this manner using redemption
proceeds from trusts which assess the amount of any remaining deferred sales fee
at redemption, you should be aware that any deferred sales fee remaining on
these units will be deducted from those redemption proceeds.  In order to
qualify for this discount, your unit redemption or trust termination must occur
on the same day that you purchase units of the trust offered in this prospectus.
These discounts apply only during the initial offering period.

  Dividend Reinvestment Plan.  We do not charge any sales fee when you reinvest
distributions from your trust into additional units of the trust.  This sales
fee discount applies during the initial offering period and in the secondary
market.  Since the deferred sales fee is a fixed dollar amount per unit, your
trust must charge this fee per unit regardless of this discount.  If you elect
the distribution reinvestment plan, we will credit you with additional units
with a dollar value sufficient to cover the amount of any remaining fee that
will be collected on such units at the time of reinvestment.  The dollar value
of these units will fluctuate over time.

  RETIREMENT ACCOUNTS.  The portfolio may be suitable for purchase in tax-
advantaged retirement accounts.  You should contact your financial professional
about the accounts offered and any additional fees imposed.

                             HOW TO SELL YOUR UNITS

  You can sell or redeem your units on any business day the New York Stock
Exchange is open by contacting your financial professional.  Unit prices are
available daily on the internet at WWW.AAMUNITTRUST.COM or through your
financial professional.  The sale and redemption price of units is equal to the
net asset value per unit, provided that you will not pay organization costs if
you sell or redeem units during the initial offering period.  The sale and
redemption price is sometimes referred to as the "liquidation price."  You pay
any remaining deferred sales fee when you sell or redeem your units.  Certain
broker-dealers may charge a transaction or other fee for processing unit
redemption or sale requests.


8     Understanding Your Investment


  SELLING UNITS.  We may maintain a secondary market for units.  This means
that if you want to sell your units, we may buy them at the current net asset
value, provided that you will not pay organization costs if you sell units
during the initial offering period.  We may then resell the units to other
investors at the public offering price or redeem them for the redemption price.
Our secondary market repurchase price is the same as the redemption price.
Certain broker-dealers might also maintain a secondary market in units.  You
should contact your financial professional for current repurchase prices to
determine the best price available.  We may discontinue our secondary market at
any time without notice.  Even if we do not make a market, you will be able to
redeem your units with the trustee on any business day for the current
redemption price.

  REDEEMING UNITS.  You may also redeem your units directly with the trustee,
The Bank of New York, on any day the New York Stock Exchange is open.  The
redemption price that you will receive for units is equal to the net asset value
per unit, provided that you will not pay organization costs if you redeem units
during the initial offering period.   You will pay any remaining deferred sales
fee at the time you redeem units.  The trustee must receive your completed
redemption request prior to the close of regular trading on the New York Stock
Exchange for you to receive the net asset value for a particular day.  If your
request is received after that time or is incomplete in any way, you will
receive the next net asset value computed after the trustee receives your
completed request.

  If you redeem your units, the trustee will generally send you a payment for
your units no later than seven days after it receives all necessary
documentation (this will usually only take three business days).  The only time
the trustee can delay your payment is if the New York Stock Exchange is closed
(other than weekends or holidays), the Securities and Exchange Commission
determines that trading on that exchange is restricted or an emergency exists
making sale or evaluation of the securities not reasonably practicable, and for
any other period that the Securities and Exchange Commission permits.

  To redeem your units, you must send the trustee any certificates for your
units.  You must properly endorse your certificates or sign a written transfer
instrument with a signature guarantee.  The trustee may require additional
documents such as a certificate of corporate authority, trust documents, a death
certificate, or an appointment as executor, administrator or guardian.  The
trustee cannot complete your redemption or send your payment to you until it
receives all of these documents in complete form.

  You can request an in-kind distribution of the securities underlying your
units if you tender at least 2,500 units for redemption (or such other amount as
required by your financial professional's firm).  This option is generally
available only for securities traded and held in the United States.  The trustee
will make any in-kind distribution of securities by distributing applicable
securities in book entry form to the account of your financial professional at
Depository Trust Company.  You will receive whole shares of the applicable
securities and cash equal to any fractional shares.  You may not request this
option in the last 30 days of your trust's life.  We may discontinue this option
at any time without notice.

  EXCHANGE OPTION.  You may be able to exchange your units for units of our
other unit trusts at a reduced sales fee.  You can contact your financial
professional for more information about trusts currently available for
exchanges.  Before you exchange units, you should read the prospectus


                                             Understanding Your Investment     9


carefully and understand the risks and fees.  You should then discuss this
option with your financial professional to determine whether your investment
goals have changed, whether current trusts suit you and to discuss tax
consequences.  We may discontinue this option upon sixty days notice.

                                  DISTRIBUTIONS

  MONTHLY DISTRIBUTIONS.  Your trust generally pays distributions of its net
investment income (pro-rated on an annual basis) along with any excess capital
on each monthly distribution date to unitholders of record on the preceding
record date.  The record and distribution dates are shown under "Essential
Information" in the "Investment Summary" section of this prospectus.  In some
cases, your trust might pay a special distribution if it holds an excessive
amount of cash pending distribution.  For example, this could happen as a result
of a merger or similar transaction involving a company whose stock is in your
portfolio.  The amount of your distributions will vary from time to time as
companies change their dividends or trust expenses change.

  When the trust receives dividends from a portfolio security, the trustee
credits the dividends to the trust's accounts.  In an effort to make relatively
regular income distributions, the trust's monthly income distribution is equal
to one-twelfth of the estimated net annual dividends to be received by the trust
after deduction of trust operating expenses.  Because the trust does not receive
dividends from the portfolio securities at a constant rate throughout the year,
the trust's income distributions to unitholders may be more or less than the
amount credited to the trust accounts as of the record date.  For the purpose of
minimizing fluctuation in income distributions, the trustee is authorized to
advance such amounts as may be necessary to provide income distributions of
approximately equal amounts.  The trustee will be reimbursed, without interest,
for any such advances from available income received by the trust on the ensuing
record date.

  ESTIMATED ANNUAL DISTRIBUTIONS.  The estimated net annual distributions are
also shown under "Essential Information" in the "Investment Summary" section of
this prospectus.  We base the estimate of the dividends the trust will receive
from the closed-end funds by annualizing the most recent dividends declared by
the closed-end funds.  Due to various factors, actual dividends received from
the closed-end funds will most likely differ from their most recent annualized
dividends.  The actual net annual distributions you will receive will vary with
changes in the trust's fees and expenses, in dividends received and with the
sale of securities.  The estimated net annual distributions for subsequent years
are expected to be less than estimated distributions for the first year because
a portion of the securities included in the trust portfolio will be sold during
the first year to pay for organization costs and the deferred sales fee.

  REPORTS.  The trustee or your financial professional will make available to
you a statement showing income and other receipts of your trust for each
distribution.  Each year the trustee will also provide an annual report on your
trust's activity and certain tax information.  You can request copies of
security evaluations to enable you to complete your tax forms and audited
financial statements for your trust, if available.

                                INVESTMENT RISKS

  All investments involve risk.  This section describes the main risks that can
impact the value of the securities in your portfolio.  You


10     Understanding Your Investment


should understand these risks before you invest.  If the value of the securities
falls, the value of your units will also fall.  We cannot guarantee that your
trust will achieve its objective or that your investment return will be positive
over any period.

  MARKET RISK is the risk that the value of the securities in your trust will
fluctuate.  This could cause the value of your units to fall below your original
purchase price.  Market value fluctuates in response to various factors.  These
can include changes in interest rates, inflation, the financial condition of a
security's issuer, perceptions of the issuer, or ratings on a security.  Even
though we supervise your portfolio, you should remember that we do not manage
your portfolio.  Your trust will not sell a security solely because the market
value falls as is possible in a managed fund.

  DIVIDEND PAYMENT RISK is the risk that an issuer of a security is unwilling
or unable to pay income on a security.  Stocks represent ownership interests in
the issuers and are not obligations of the issuers.  Common stockholders have a
right to receive dividends only after the company has provided for payment of
its creditors, bondholders and preferred stockholders.  Common stocks do not
assure dividend payments.  Dividends are paid only when declared by an issuer's
board of directors and the amount of any dividend may vary over time.

  BASIC MATERIALS COMPANIES.  The trust invests exclusively in companies within
the basic materials sector.   Any negative impact on this industry will have a
greater impact on the value of units than on a portfolio diversified over
several industries.  You should understand the risks of this industry before you
invest.

  Companies in the basic materials sector are engaged in the manufacture,
mining, processing, or distribution of raw materials and intermediate goods used
in the industrial sector.  These may include materials and products such as
chemicals, commodities, forestry products, paper products, copper, iron ore,
nickel, steel, aluminum, precious metals, textiles, cement and gypsum.  General
risks of the basic materials industry include the general state of the economy,
consolidation, domestic and international politics, price and supply
fluctuations, technical progress, labor relations, government regulations,
volatile interest rates, consumer spending trends, overall capital spending
levels and excess capacity.  In addition, basic materials companies may also be
significantly affected by volatility of commodity prices, currency exchange
rates, import controls, worldwide competition, depletion of resources, and
mandated expenditures for safety and pollution control devices.  These companies
are also at risk for environmental damage and product liability claims.
Production of industrial materials often exceeds demand as a result of over-
building or economic downturns, which may lead to poor investment returns.

  FOREIGN ISSUER RISK.  Because the trust invests in stocks of foreign
companies, the trust involves additional risks that differ from an investment
exclusively in domestic stocks.  These risks include the risk of losses due to
future political and economic developments, international trade conditions,
foreign withholding taxes and restrictions on foreign investments and exchange
of securities.  The trust also involves the risk that fluctuations in exchange
rates between the U.S. dollar and foreign currencies may negatively affect the
value of the stocks.  The trust involves the risk that information about the
stocks is not publicly available or is inaccurate due to the absence of uniform
accounting and financial reporting standards.


                                            Understanding Your Investment     11


In addition, some foreign securities markets are less liquid than U.S. markets.
This could cause the trust to buy stocks at a higher price or sell stocks at a
lower price than would be the case in a highly liquid market.  Foreign
securities markets are often more volatile and involve higher trading costs than
U.S. markets, and foreign companies, securities markets and brokers are also
generally not subject to the same level of supervision and regulation as in the
U.S.  Certain stocks may be held in the form of American Depositary Receipts or
other similar receipts ("ADRs").  ADRs represent receipts for foreign common
stock deposited with a custodian (which may include the trustee of your trust).
The ADRs in the trust, if any, trade in the U.S. in U.S. dollars and are
registered with the Securities and Exchange Commission.  ADRs generally involve
the same types of risks as foreign common stock held directly.  Some ADRs may
experience less liquidity than the underlying common stocks traded in their home
market.

  SMALL COMPANIES.  The trust may invest in stocks issued by small companies
which generally include those with market capitalizations of less than $1
billion.  The share prices of these small-cap companies are often more volatile
than those of larger companies as a result of several factors common to many
such issuers, including limited trading volumes, products or financial
resources, management inexperience and less publicly available information.

  LEGISLATION/LITIGATION.  From time to time, various legislative initiatives
are proposed in the United States and abroad which may have a negative impact on
certain of the companies represented in the trust.  In addition, litigation
regarding any of the issuers of the securities or of the industries represented
by these issuers may negatively impact the share prices of these securities.  No
one can predict what impact any pending or threatened litigation will have on
the share prices of the securities.

  LIQUIDITY RISK is the risk that the value of a security will fall if trading
in the security is limited or absent.  No one can guarantee that a liquid
trading market will exist for any security.

  NO FDIC GUARANTEE.  An investment in the trust is not a deposit of any bank
and is not insured or guaranteed by the Federal Deposit Insurance Corporation or
any other government agency.

                               HOW THE TRUST WORKS

  YOUR TRUST.  Your trust is a unit investment trust registered under the
Investment Company Act of 1940.  We created the trust under a trust agreement
between Fixed Income Securities, L.P. (as depositor/sponsor, evaluator and
supervisor) and The Bank of New York (as trustee).  We provide services to unit
trusts through our Advisor's Asset Management division.  To create your trust,
we deposited securities with the trustee (or contracts to purchase securities
along with an irrevocable letter of credit or other consideration to pay for the
securities).  In exchange, the trustee delivered units of your trust to us.
Each unit represents an undivided interest in the assets of your trust.  These
units remain outstanding until redeemed or until your trust terminates.  At the
close of the New York Stock Exchange on the trust's inception date, the number
of units may be adjusted so that the public offering price per unit equals $10.
The number of units and fractional interest of each unit in the trust will
increase or decrease to the extent of any adjustment.

  CHANGING YOUR PORTFOLIO.  Your trust is not a managed fund.  Unlike a managed
fund, we


12     Understanding Your Investment


designed your portfolio to remain relatively fixed.   Under normal
circumstances, the trust will invest at least 80% of its assets in preferred
securities.  Your trust will generally buy and sell securities:

  *  to pay expenses,

  *  to issue additional units or redeem units,

  *  in limited circumstances to protect the trust, or

  *  as permitted by the trust agreement.

  Your trust will generally reject any offer for securities or other property
in exchange for the securities in its portfolio.  If your trust receives
securities or other property, it will either hold the securities or property
in the portfolio or sell the securities or property and distribute the proceeds.

  We will increase the size of your trust as we sell units.  When we create
additional units, we will seek to replicate the existing portfolio.  When your
trust buys securities, it may pay brokerage or other acquisition fees.  You
could experience a dilution of your investment because of these fees and
fluctuations in security prices between the time we create units and the time
your trust buys the securities.  When your trust buys or sells securities, we
may direct that it place orders with and pay brokerage commissions to brokers
that sell units or are affiliated with your trust or the trustee.  We may
consider whether a firm sells units of our trusts or conducts other business
with us when we select firms to handle these transactions.

  AMENDING THE TRUST AGREEMENT.  The sponsor and the trustee can change the
trust agreement without your consent to correct any provision that may be
defective or to make other provisions that will not adversely affect your
interest (as determined by the sponsor and the trustee).  We cannot change this
agreement to reduce your interest in your trust without your consent.  Investors
owning two-thirds of the units in your trust may vote to change this agreement.

  TERMINATION OF YOUR TRUST.  Your trust will terminate on the termination date
set forth under "Essential Information" in the "Investment Summary" section of
this prospectus.  The trustee may terminate your trust early if the value of the
trust is less than 40% of the original value of the securities in the trust at
the time of deposit.  At this size, the expenses of your trust may create an
undue burden on your investment.  Investors owning two-thirds of the units in
your trust may also vote to terminate the trust early.  The trustee will
liquidate the trust in the event that a sufficient number of units not yet sold
to the public are tendered for redemption so that the net worth of the trust
would be reduced to less than 40% of the value of the securities at the time
they were deposited in the trust.  If this happens, we will refund any sales
charge that you paid.

  The trustee will notify you of any termination and sell any remaining
securities.  The trustee will send your final distribution to you within a
reasonable time following liquidation of all the securities after deducting
final expenses.  Your termination distribution may be less than the price you
originally paid for your units.

  THE SPONSOR.  The sponsor of the trust is Fixed Income Securities, L.P.
acting through its Advisor's Asset Management division.  We are a broker-dealer
specializing in providing trading and support services to broker-dealers,
registered representatives, investment advisers and other financial
professionals.  Our headquarters are located at 18925 Base Camp Road, Monument,


                                            Understanding Your Investment     13


Colorado 80132.  You can contact our Advisor's Asset Management division at 8100
East 22nd Street North, Suite 900B, Wichita, Kansas 67226-2309 or by using the
contacts listed on the back cover of this prospectus.  We are a registered
broker-dealer and investment adviser and a member of the National Association of
Securities Dealers, Inc. (NASD), the Municipal Securities Rulemaking Board
(MSRB), and the Securities Investor Protection Corporation (SIPC).  If we fail
to or cannot perform our duties as sponsor or become bankrupt, the trustee may
replace us, continue to operate your trust without a sponsor, or terminate your
trust.

  We and your trust have adopted a code of ethics requiring our employees who
have access to information on trust transactions to report personal securities
transactions.  The purpose of the code is to avoid potential conflicts of
interest and to prevent fraud, deception or misconduct with respect to your
trust.

  THE TRUSTEE.  The Bank of New York is the trustee of your trust.  Its
principal unit investment trust division office is located at 2 Hanson Place,
12th Floor, Brooklyn, New York 11217.  You can contact the trustee by calling
the telephone number on the back cover of this prospectus or by writing to its
unit investment trust office.  We may remove and replace the trustee in some
cases without your consent.  The trustee may also resign by notifying us and
investors.

  HOW WE DISTRIBUTE UNITS.  We sell units to the public through broker-dealers
and other firms.  We pay part of the sales fee to these distribution firms when
they sell units.  The distribution fee (the broker-dealer concession or agency
commission) is 3.60% of the public offering price per unit (or 65% of the sales
fee for secondary market sales).  For transactions involving unitholders of
other unit investment trusts who use their redemption or termination proceeds to
purchase units of the trust, the regular concession or agency commission will
amount to 2.60% of the public offering price per unit.  No distribution fee is
paid to broker-dealers or other selling firms in connection with unit sales in
investment accounts that charge a "wrap fee" or periodic fees for investment
advisory, financial planning or asset management services in lieu of
commissions.   Any sales fee discount is borne by the broker-dealer or selling
firm out of the distribution fee.

  From time to time we may sponsor programs which provide awards to a dealer's
or selling agent's registered representatives who have sold a minimum number of
units during a specified time period.  We may also pay fees to qualifying
dealers for services or activities which are meant to result in sales of units
of the trust.  In addition, we will pay to dealers who sponsor sales contests or
recognition programs that conform to our criteria, or participate in our sales
programs, amounts equal to no more than the total applicable transactional sales
fees on units sold by such persons during such programs.  We make these payments
out of our own assets and not out of trust assets.  These programs will not
change the price you pay for your units.

  We generally register units for sale in various states in the U.S.  We do not
register units for sale in any foreign country.  This prospectus does not
constitute an offer of units in any state or country where units cannot be
offered or sold lawfully.  We may reject any order for units in whole or in
part.

  We may gain or lose money when we hold units in the primary or secondary
market due to fluctuations in unit prices.  The gain or loss is equal to the
difference between the price we pay


14     Understanding Your Investment


for units and the price at which we sell or redeem them.  We may also gain or
lose money when we deposit securities to create units.  The amount of our profit
or loss on the initial deposit of securities into the trust is shown in the
"Notes to Portfolio."

                                      TAXES

  This section summarizes some of the main U.S. federal income tax consequences
of owning units of the trust.  This section is current as of the date of this
prospectus.  Tax laws and interpretations change frequently, and these summaries
do not describe all of the tax consequences to all taxpayers.  For example,
these summaries generally do not describe your situation if you are a
corporation, a non-U.S. person, a broker/dealer, or other investor with special
circumstances.  In addition, this section does not describe your state or
foreign taxes.  As with any investment, you should consult your own tax
professional about your particular consequences.  In addition, the Internal
Revenue Service issued new withholding and reporting regulations effective
January 1, 2001.  Foreign investors should consult their own tax advisors
regarding the tax consequences of these regulations.

  TRUST STATUS.  Your trust will not be taxed as a corporation for federal
income tax purposes.  As a unit owner, you will be treated as the owner of a pro
rata portion of the securities and other assets held by your trust, and as such
you will be considered to have received a pro rata share of income (e.g.,
dividends and capital gains, if any) from each security when such income would
be considered to be received by you if you directly owned your trust's assets.
This is true even if you elect to have your distributions automatically
reinvested into additional units.  In addition, the income from your trust which
you must take into account for federal income tax purposes is not reduced by
amounts used to pay trust expenses (including the deferred sales charge, if
any).

  YOUR TAX BASIS AND INCOME OR LOSS UPON DISPOSITION.  If your trust disposes
of securities, you will generally recognize gain or loss.  If you dispose of
your units or redeem your units for cash, you will also generally recognize gain
or loss.   To determine the amount of this gain or loss, you must subtract your
tax basis in the related securities from your share of the total amount received
in the transaction.  You can generally determine your initial tax basis in each
security or other trust asset by apportioning the cost of your units, generally
including sales charges, among each security or other trust asset ratably
according to their value on the date you purchase your units.  In certain
circumstances, however, you may have to adjust your tax basis after you purchase
your units (for example, in the case of certain dividends that exceed a
corporation's accumulated earnings and profits).

  Under the recently enacted "Jobs and Growth Tax Relief Reconciliation Act of
2003" (the "Tax Act"), if you are an individual, the maximum marginal federal
tax rate for net capital gain is generally 15% (generally 5% for certain
taxpayers in the 10% and 15% tax brackets).  These new capital gains rates are
generally effective for taxable years ending on or after May 6, 2003 and
beginning before January 1, 2009.  However, special effective date provisions
are set forth in the Tax Act.  For example, there are special transition rules
provided with respect to gain properly taken into account for the portion of the
taxable year before May 6, 2003.

  Net capital gain equals net long-term capital gain minus net short-term
capital loss for the taxable year.  Capital gain or loss is long-term if the
holding period for the asset is more than one year


                                            Understanding Your Investment     15


and is short-term if the holding period for the asset is one year or less.  You
must exclude the date you purchase your units to determine your holding period.
The tax rates for capital gains realized from assets held for one year or less
are generally the same as for ordinary income.  The Internal Revenue Code,
however, treats certain capital gains as ordinary income in special situations.

  In addition, it should be noted that certain dividends received by your trust
may qualify to be taxed at the same new rates that apply to net capital gain (as
discussed above), provided certain holding requirements are satisfied.  These
special rules relating to the taxation of dividends at capital gains rates
generally apply to taxable years beginning after December 31, 2002 and beginning
before January 1, 2009.

  DIVIDENDS RECEIVED DEDUCTION.  Generally, a domestic corporation owning units
in a trust may be eligible for the dividends received deduction with respect to
such unitholder's pro rata portion of certain types of dividends received by a
trust.  However, a corporation generally will not be entitled to the dividends
received deduction with respect to dividends from most foreign corporations.

  EXCHANGES.  If you elect to have your proceeds from a trust rolled over into
a future series of the trust, it is considered a sale for federal income tax
purposes, and any gain on the sale will be treated as a capital gain, and any
loss will be treated as a capital loss.  However, any loss you incur in
connection with the exchange of your units of your trust for units of the next
series will generally be disallowed with respect to this deemed sale and
subsequent deemed repurchase, to the extent the two trusts have substantially
identical securities or other trust assets under the wash sale provisions of the
Internal Revenue Code.

  IN-KIND DISTRIBUTIONS.  Under certain circumstances, as described in this
prospectus, you may request a distribution of securities (an "In-Kind
Distribution") when you redeem your units or at your trust's termination.  By
electing to receive an "In-Kind Distribution", you will receive whole shares of
stock plus, possibly, cash.  You will not recognize gain or loss if you only
receive securities in exchange for your pro rata portion of the securities held
by your trust.  However, if you also receive cash in exchange for a trust asset
or a fractional share of a security held by your trust, you will generally
recognize gain or loss based on the difference between the amount of cash you
receive and your tax basis in such trust asset or fractional share.

  LIMITATIONS ON THE DEDUCTIBILITY OF TRUST EXPENSES.  Generally, for federal
income tax purposes, you must take into account your full pro rata share of your
trust's income, even if some of that income is used to pay trust expenses.  You
may deduct your pro rata share of each expense paid by your trust to the same
extent as if you directly paid the expense.  You may, however, be required to
treat some or all of the expenses of your trust as miscellaneous itemized
deductions.  Individuals may only deduct certain miscellaneous itemized
deductions to the extent they exceed 2% of adjusted gross income.

  FOREIGN, STATE AND LOCAL TAXES.  Distributions by your trust that are treated
as U.S. source income (e.g., dividends received on securities of domestic
corporations) will generally be subject to U.S. income taxation and withholding
in the case of units held by non-resident alien individuals, foreign
corporations or other non-U.S. persons, subject to any applicable treaty.
However, distributions by your trust that are derived from certain dividends of
securities of a foreign corporation may not be subject to U.S. income taxation
and withholding in the


16     Understanding Your Investment


case of units held by non-resident alien individuals, foreign corporations or
other non-U.S. persons.

  Some distributions by your trust may be subject to foreign withholding taxes.
Any dividends withheld will nevertheless be treated as income to you.  However,
because you are deemed to have paid directly your share of foreign taxes that
have been paid or accrued by your trust, you may be entitled to a foreign tax
credit or deduction for U.S. tax purposes with respect to such taxes.

  Under the existing income tax laws of the State and City of New York, your
trust will not be taxed as a corporation, and the income of your trust will be
treated as the income of the unitholders in the same manner as for federal
income tax purposes.

                                    EXPENSES

  Your trust will pay various expenses to conduct its operations.  The "Fees
and Expenses" section of the "Investment Summary" in this prospectus shows the
estimated amount of these expenses.

  Your trust will pay a fee to the trustee for its services.  The trustee also
benefits when it holds cash for your trust in non-interest bearing accounts.
Your trust will reimburse us as supervisor, evaluator and sponsor for providing
portfolio supervisory services, for evaluating your portfolio and for providing
bookkeeping and administrative services.  Our reimbursements may exceed the
costs of the services we provide to your trust but will not exceed the costs of
services provided to all of our unit investment trusts in any calendar year.
All of these fees may adjust for inflation without your approval.

  Your trust will also pay its general operating expenses.  Your trust may pay
expenses such as trustee expenses (including legal and auditing expenses),
various governmental charges, fees for extraordinary trustee services, costs of
taking action to protect your trust, costs of indemnifying the trustee and the
sponsor, legal fees and expenses, expenses incurred in contacting you and costs
incurred to reimburse the trustee for advancing funds to meet distributions.
Your trust may pay the costs of updating its registration statement each year.
The trustee will generally pay trust expenses from distributions received on the
securities but in some cases may sell securities to pay trust expenses.

                                     EXPERTS

  LEGAL MATTERS.  Chapman and Cutler, LLP acts as counsel for the trust and has
given an opinion that the units are validly issued.  Emmett, Marvin & Martin,
LLP acts as counsel for the trustee and as special counsel for New York tax
matters.

  INDEPENDENT REGISTERED PUBLIC ACCOUNTING FIRM.  Grant Thornton LLP,
independent registered public accounting firm, audited the statement of
financial condition and the portfolio included in this prospectus.

                             ADDITIONAL INFORMATION

  This prospectus does not contain all the information in the registration
statement that your trust filed with the Securities and Exchange Commission.
The Information Supplement, which was filed with the Securities and Exchange
Commission, includes more detailed information about the securities in your
portfolio, investment risks and general information about your trust.  You can
obtain the Information Supplement by contacting us or the Securities and
Exchange Commission as indicated on the back cover of this prospectus.  This
prospectus incorporates the Information Supplement by reference (it is legally
considered part of this prospectus).


                                            Understanding Your Investment     17


REPORT OF INDEPENDENT REGISTERED PUBLIC ACCOUNTING FIRM

UNITHOLDERS
ADVISOR'S DISCIPLINED TRUST, SERIES 21

We have audited the accompanying statement of financial condition, including the
trust portfolio on page 4, of Advisor's Disciplined Trust, Series 21, as of
October ___, 2004, the initial date of deposit.  The statement of financial
condition is the responsibility of the trust's sponsor.  Our responsibility is
to express an opinion on this statement of financial condition based on our
audit.

We conducted our audit in accordance with auditing standards of the Public
Company Accounting Oversight Board (United States).  Those standards require
that we plan and perform the audit to obtain reasonable assurance about whether
the statement of financial condition is free of material misstatement.  An audit
includes examining, on a test basis, evidence supporting the amounts and
disclosures in the  statement of financial condition.  Our procedures included
confirmation with The Bank of New York, trustee, of cash or an irrevocable
letter of credit deposited for the purchase of securities as shown in the
statement of financial condition as of October ___, 2004.  An audit also
includes assessing the accounting principles used and significant estimates made
by the sponsor, as well as evaluating the overall statement of financial
condition presentation.  We believe that our audit of the statement of financial
condition provides a reasonable basis for our opinion.

In our opinion, the statement of financial condition referred to above presents
fairly, in all material respects, the financial position of Advisor's
Disciplined Trust, Series 21 as of October ___, 2004, in conformity with
accounting principles generally accepted in the United States of America.

                                   GRANT THORNTON LLP
Chicago, Illinois
October ___, 2004




ADVISOR'S DISCIPLINED TRUST, SERIES 21

STATEMENT OF FINANCIAL CONDITION
AS OF OCTOBER ___, 2004
- -------------------------------------------------------------------------------
                                                                          

  INVESTMENT IN STOCKS
  Contracts to purchase underlying stocks (1)(2) . . . . . . . . . . . . . . $
                                                                             ----------
    Total  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . $
                                                                             ==========

  LIABILITIES AND INTEREST OF INVESTORS
  Liabilities:
    Organization costs (3) . . . . . . . . . . . . . . . . . . . . . . . . .
    Deferred sales fee (4) . . . . . . . . . . . . . . . . . . . . . . . . .
                                                                             ----------

                                                                             ----------

  Interest of investors:
    Cost to investors (5)  . . . . . . . . . . . . . . . . . . . . . . . . .
    Less: initial sales fee (4)(5) . . . . . . . . . . . . . . . . . . . . .
    Less: deferred sales fee and organization costs (3)(4)(5)  . . . . . . .
                                                                             ----------
    Net interest of investors  . . . . . . . . . . . . . . . . . . . . . . .
                                                                             ----------
    Total  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . $
                                                                             ==========

  Number of units  . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
                                                                             ==========

  Net asset value per unit . . . . . . . . . . . . . . . . . . . . . . . . . $    9.476
                                                                             ==========


<FN>
(1)  Aggregate cost of the securities is based on the closing sale price
     evaluations as determined by the evaluator.
(2)  Cash or an irrevocable letter of credit has been deposited with the trustee
     covering the funds (aggregating $200,000) necessary for the purchase of
     securities in the trust represented by purchase contracts.
(3)  A portion of the public offering price represents an amount sufficient to
     pay for all or a portion of the costs incurred in establishing and offering
     the trust.  These costs have been estimated at $0.029 per unit for the
     trust.  A distribution will be made as of the earlier of the close of the
     initial offering period or six months following the trust's inception
     date to an account maintained by the trustee from which this obligation
     of the investors will be satisfied.  To the extent the actual organization
     costs are greater than the estimated amount, only the estimated
     organization costs added to the public offering price will be reimbursed
     to the sponsor and deducted from the assets of the trust.
(4)  The total sales fee consists of an initial sales fee and a deferred sales
     fee. The initial sales fee is equal to the difference between the maximum
     sales fee and the remaining deferred sales fee. On the inception date, the
     total sales fee is 4.95% (equivalent to 5.208% of the net amount invested).
     The deferred sales fee is equal to $0.395 per unit.
(5)  The aggregate cost to investors includes the applicable sales fee assuming
     no reduction of sales fees for quantity purchases.



19     Understanding Your Investment


CONTENTS

INVESTMENT SUMMARY
- -------------------------------------------------------------------

A concise description        2     Investment Objective
of essential information     2     Principal Investment Strategy
about the portfolio          2     Principal Risks
                             3     Who Should Invest
                             3     Essential Information
                             3     Fees and Expenses
                             4     Portfolio
                             5     The Securities


UNDERSTANDING YOUR INVESTMENT
- -------------------------------------------------------------------

Detailed information to      6     How to Buy Units
help you understand          8     How to Sell Your Units
your investment             10     Distributions
                            10     Investment Risks
                            12     How the Trust Works
                            15     Taxes
                            17     Expenses
                            17     Experts
                            17     Additional Information
                            18     Report of Independent Registered
                                   Public Accounting Firm
                            18     Statement of Financial Condition

WHERE TO LEARN MORE
- -------------------------------------------------------------------

You can contact us for             VISIT US ON THE INTERNET
free information about             http://www.AAMunittrust.com
this and other investments,        BY E-MAIL
including the Information          info@AAMunittrust.com
Supplement                         CALL ADVISOR'S ASSET MANAGEMENT
                                   (877) 858-1773
                                   CALL THE BANK OF NEW YORK
                                   (800) 221-7668

ADDITIONAL INFORMATION
- -------------------------------------------------------------------

This prospectus does not contain all information filed with the
Securities and Exchange Commission.  To obtain or copy this
information including the Information Supplement (a duplication
fee may be required):

  E-MAIL:  publicinfo@sec.gov
  WRITE:   Public Reference Section
           Washington, D.C.  20549-0102
  VISIT:   http://www.sec.gov
           (EDGAR Database)
  CALL:    1-202-942-8090
           (only for information on the operation of the
           Public Reference Section)

REFER TO:
  ADVISOR'S DISCIPLINED TRUST, SERIES 21
  Securities Act file number:  333-________
  Investment Company Act file number:  811-21056





                                  GLOBAL BASIC
                              MATERIALS PORTFOLIO,
                                    SERIES 1


                                   PROSPECTUS


                                OCTOBER ___, 2004












                                      [LOGO]

                                    ADVISOR'S
                                ASSET MANAGEMENT

                   A DIVISION OF FIXED INCOME SECURITIES, L.P.





                     ADVISOR'S DISCIPLINED TRUST, SERIES 21

                   GLOBAL BASIC MATERIALS PORTFOLIO, SERIES 1

                             INFORMATION SUPPLEMENT

      This Information Supplement provides additional information concerning
each trust described in the prospectus for the Advisor's Disciplined Trust
series identified above.  This Information Supplement should be read in
conjunction with the prospectus.  It is not a prospectus.  It does not include
all of the information that an investor should consider before investing in a
trust.  It may not be used to offer or sell units of a trust without the
prospectus.  This Information Supplement is incorporated into the prospectus by
reference and has been filed as part of the registration statement with the
Securities and Exchange Commission.  Investors should obtain and read the
prospectus prior to purchasing units of a trust.  You can obtain the prospectus
without charge by contacting your financial professional or by contacting the
Advisor's Asset Management division of Fixed Income Securities, L.P. at 18925
Base Camp Road, Suite 203, Monument, Colorado 80132, at 8100 East 22nd Street
North, Suite 900B, Wichita, Kansas 67226-2309 or by calling (877) 858-1773.
This Information Supplement is dated as of the date of the prospectus.



                                    CONTENTS

                                                            
          General Information                                   2
          Investment Objective and Policies                     3
          Risk Factors                                          4
          Administration of the Trust                           6
          Portfolio Transactions and Brokerage Allocation      15
          Purchase, Redemption and Pricing of Units            15
          Performance Information                              21















GENERAL INFORMATION

     Each trust is one of a series of separate unit investment trusts created
under the name Advisor's Disciplined Trust and registered under the Investment
Company Act of 1940.  Each trust was created as a common law trust on the
inception date described in the prospectus under the laws of the state of
New York.  Each trust was created under a trust agreement among Fixed Income
Securities, L.P. (as sponsor, evaluator and supervisor) and The Bank of New York
(as trustee).  The sponsor provides services to unit investment trusts through
its Advisor's Asset Management division.

     When your trust was created, the sponsor delivered to the trustee
securities or contracts for the purchase thereof for deposit in the trust and
the trustee delivered to the sponsor documentation evidencing the ownership of
units of the trust.  At the close of the New York Stock Exchange on the trust's
inception date, the number of units may be adjusted so that the public offering
price per unit equals $10.  The number of units and fractional interest of each
unit in the trust will increase or decrease to the extent of any adjustment.
Additional units of each trust may be issued from time to time by depositing in
the trust additional securities (or contracts for the purchase thereof together
with cash or irrevocable letters of credit) or cash (including a letter of
credit or the equivalent) with instructions to purchase additional securities.
As additional units are issued by a trust as a result of the deposit of
additional securities by the sponsor, the aggregate value of the securities in
the trust will be increased and the fractional undivided interest in the trust
represented by each unit will be decreased.  The sponsor may continue to make
additional deposits of securities into a trust, provided that such additional
deposits will be in amounts, which will generally maintain the existing
relationship among the shares of the securities in such trust.  Thus, although
additional units will be issued, each unit will generally continue to represent
the same number of shares of each security.  If the sponsor deposits cash to
purchase additional securities, existing and new investors may experience a
dilution of their investments and a reduction in their anticipated income
because of fluctuations in the prices of the securities between the time of the
cash deposit and the purchase of the securities and because the trust will pay
any associated brokerage fees.

     The trustee has not participated in the selection of the securities
deposited in the trust and has no responsibility for the composition of the
trust portfolio.

     Each unit initially offered represents an undivided interest in the related
trust.  To the extent that any units are redeemed by the trustee or additional
units are issued as a result of additional securities being deposited by the
sponsor, the fractional undivided interest in a trust represented by each
unredeemed unit will increase or decrease accordingly, although the actual
interest in such trust represented by such fraction will remain unchanged.
Units will remain outstanding until redeemed upon tender to the trustee by
unitholders, which may include the sponsor, or until the termination of the
trust agreement.

     A trust consists of (a) the securities listed under "Portfolio" in the
prospectus as may continue to be held from time to time in the trust, (b) any
additional securities acquired and held by the trust pursuant to the provisions
of the trust agreement and (c) any cash held in the accounts of the trust.
Neither the sponsor nor the trustee shall be liable in any way for any failure


                                      -2-


in any of the securities.  However, should any contract for the purchase of any
of the securities initially deposited in a trust fail, the sponsor will, unless
substantially all of the moneys held in the trust to cover such purchase are
reinvested in substitute securities in accordance with the trust agreement,
refund the cash and sales fee attributable to such failed contract to all
unitholders on the next distribution date.

INVESTMENT OBJECTIVE AND POLICIES

     The trust seeks to provide income and capital appreciation by investing in
a portfolio consisting of common stock of foreign and domestic basic materials
companies as described in the prospectus. There is, of course, no guarantee that
the trust will achieve its objective.  The prospectus provides additional
information regarding the trust's objective and investment strategy.

     The trust is a unit investment trust and is not an "actively managed" fund.
Traditional methods of investment management for a managed fund typically
involve frequent changes in a portfolio of securities on the basis of economic,
financial and market analysis.  The portfolio of a trust, however, will not be
actively managed and therefore the adverse financial condition of an issuer will
not necessarily require the sale of its securities from a portfolio.

     The sponsor may not alter the portfolio of a trust by the purchase, sale or
substitution of securities, except in special circumstances as provided in the
trust agreement.  Thus, the assets of a trust will generally remain unchanged
under normal circumstances.  The trust agreement provides that the sponsor may
(but need not) direct the trustee to dispose of a security in certain events
such as the issuer having defaulted on the payment on any of its outstanding
obligations or the price of a security has declined to such an extent or other
such credit factors exist so that in the opinion of the supervisor the retention
of such securities would be detrimental to the trust.  If a public tender offer
has been made for a security or a merger or acquisition has been announced
affecting a security, the trustee may either sell the security or accept a
tender offer for cash if the supervisor determines that the sale or tender is in
the best interest of unitholders.  The trustee will distribute any excess cash
proceeds to unitholders.  Pursuant to the trust agreement and with limited
exceptions, the trustee may sell any securities or other properties acquired in
exchange for securities such as those acquired in connection with a merger or
other transaction.  If offered such new or exchanged securities or property
other than cash, the trustee shall generally reject the offer.  However, in the
event such securities or property are nonetheless acquired by the trust, they
may be accepted for deposit in a trust and either sold by the trustee or held in
a trust pursuant to the direction of the sponsor.

     The trustee may sell securities, designated by the supervisor, from a trust
for the purpose of redeeming units of such trust tendered for redemption and the
payment of expenses.

     Proceeds from the sale of securities (or any securities or other property
received by a trust in exchange for securities) are credited to the Capital
Account of a trust for distribution to unitholders or to meet redemptions.
Except for failed securities and as provided herein, in the prospectus or in the
trust agreement, the acquisition by a trust of any securities other than the
portfolio securities is prohibited.


                                      -3-


     Because certain of the securities in certain of the trusts may from time to
time under certain circumstances be sold or otherwise liquidated and because the
proceeds from such events will be distributed to unitholders and will not be
reinvested, no assurance can be given that a trust will retain for any length of
time its present size and composition.  Neither the sponsor nor the trustee
shall be liable in any way for any default, failure or defect in any security.
In the event of a failure to deliver any security that has been purchased for a
trust under a contract ("Failed Securities"), the sponsor is authorized under
the trust agreement to direct the trustee to acquire other securities
("Replacement Securities") to make up the original corpus of such trust.

     The Replacement Securities must be purchased within 20 days after delivery
of the notice that a contract to deliver a security will not be honored and the
purchase price may not exceed the amount of funds reserved for the purchase of
the Failed Securities.  The Replacement Securities must be equity securities of
the type selected for the trust and must not adversely affect the federal income
tax status of the trust.  Whenever a Replacement Security is acquired for a
trust, the trustee shall notify all unitholders of the trust of the acquisition
of the Replacement Security and shall, on the next monthly distribution date
which is more than 30 days thereafter, make a pro rata distribution of the
amount, if any, by which the cost to the trust of the Failed Security exceeded
the cost of the Replacement Security.  Once all of the securities in a trust are
acquired, the trustee will have no power to vary the investments of the trust,
i.e., the trustee will have no managerial power to take advantage of market
variations to improve a unitholder's investment.

     If the right of limited substitution described in the preceding paragraphs
is not utilized to acquire Replacement Securities in the event of a failed
contract, the sponsor will refund the sales charge attributable to such Failed
Securities to all unitholders of the trust and the trustee will distribute the
cash attributable to such Failed Securities not more than 30 days after the date
on which the trustee would have been required to purchase a Replacement
Security.  In addition, unitholders should be aware that, at the time of receipt
of such cash, they may not be able to reinvest such proceeds in other securities
at a return equal to or in excess of the return which such proceeds would have
earned for unitholders of such trust.

     In the event that a Replacement Security is not acquired by a trust, the
income for such trust may be reduced.

     To the best of the sponsor's knowledge, there is no litigation pending as
of the trust's inception in respect of any security that might reasonably be
expected to have a material adverse effect on the trust.  At any time after the
trust's inception, litigation may be instituted on a variety of grounds with
respect to the securities.  The sponsor is unable to predict whether any such
litigation may be instituted, or if instituted, whether such litigation might
have a material adverse effect on the trust.  The sponsor and the trustee shall
not be liable in any way for any default, failure or defect in any security.

RISK FACTORS

     MARKET RISK. Because the trust invests in stocks, you should understand the
risks of investing in stocks before purchasing units. These risks include the


                                      -4-


risk that the financial condition of the company or the general condition of the
stock market may worsen and the value of the stocks (and therefore units) will
fall. Stocks are especially susceptible to general stock market movements. The
value of stocks often rises or falls rapidly and unpredictably as market
confidence and perceptions of companies change. These perceptions are based on
factors including expectations regarding government economic policies,
inflation, interest rates, economic expansion or contraction, political climates
and economic or banking crises. The value of units will fluctuate with the value
of the stocks in the trust and may be more or less than the price you originally
paid for your units. As with any investment, we cannot guarantee that the
performance of the trust will be positive over any period of time. Because the
trust is unmanaged, the Trustee will not sell stocks in response to market
fluctuations as is common in managed investments. In addition, because some
trusts hold a relatively small number of stocks, you may encounter greater
market risk than in a more diversified investment.

     DIVIDENDS. Stocks represent ownership interests in a company and are not
obligations of the company. Common stockholders have a right to receive payments
from the company that is subordinate to the rights of creditors, bondholders or
preferred stockholders of the company. This means that common stockholders have
a right to receive dividends only if a company's board of directors declares a
dividend and the company has provided for payment of all of its creditors,
bondholders and preferred stockholders. If a company issues additional debt
securities or preferred stock, the owners of these securities will have a claim
against the company's assets before common stockholders if the company declares
bankruptcy or liquidates its assets even though the common stock was issued
first. As a result, the company may be less willing or able to declare or pay
dividends on its common stock.

     BASIC MATERIALS. An investment in units should be made with an
understanding of the problems and risks an investment in securities of companies
involved in the basic materials industry may entail. Companies in the basic
materials sector are engaged in the manufacture, mining, processing, or
distribution of raw materials and intermediate goods used in the industrial
sector. These may include materials and products such as chemicals, commodities,
forestry products, paper products, copper, iron ore, nickel, steel, aluminum,
precious metals, textiles, cement, gypsum. Basic materials companies may be
affected by the volatility of commodity prices, exchange rates, import controls,
worldwide competition, depletion of resources, and mandated expenditures for
safety and pollution control devices. In addition, they may be adversely
affected by technical progress, labor relations, and governmental regulation.
These companies are also at risk for environmental damage and product liability
claims. Production of industrial materials often exceeds demand as a result of
over-building or economic downturns, which may lead to poor investment returns.

     FOREIGN ISSUERS. Because a trust may invest in foreign stocks, they involve
additional risks that differ from an investment in domestic stocks. Investments
in foreign securities may involve a greater degree of risk than those in
domestic securities. There is generally less publicly available information
about foreign companies in the form of reports and ratings similar to those that
are published about issuers in the United States. Also, foreign issuers are
generally not subject to uniform accounting, auditing and financial reporting
requirements comparable to those applicable to United States issuers. With
respect to certain foreign countries, there is the possibility of adverse
changes in investment or exchange control regulations, expropriation,


                                      -5-


nationalization or confiscatory taxation, limitations on the removal of funds or
other assets of the trust, political or social instability, or diplomatic
developments which could affect United States investments in those countries.
Moreover, industrial foreign economies may differ favorably or unfavorably from
the United States' economy in terms of growth of gross national product, rate of
inflation, capital reinvestment, resource self-sufficiency and balance of
payments position. Foreign securities markets are generally not as developed or
efficient as those in the United States. While growing in volume, they usually
have substantially less volume than the New York Stock Exchange, and securities
of some foreign issuers are less liquid and more volatile than securities of
comparable United States issuers. Fixed commissions on foreign exchanges are
generally higher than negotiated commissions on United States exchanges. There
is generally less government supervision and regulation of securities exchanges,
brokers and listed issuers than in the United States.

     A trust may also involve the risk that fluctuations in exchange rates
between the U.S. dollar and foreign currencies may negatively affect the value
of the stocks. For example, if a foreign stock rose 10% in price but the U.S.
dollar gained 5% against the related foreign currency, a U.S. investor's return
would be reduced to about 5%. This is because the foreign currency would "buy"
fewer dollars or, conversely, a dollar would buy more of the foreign currency.
Many foreign currencies have fluctuated widely against the U.S. dollar for a
variety of reasons such as supply and demand of the currency, investor
perceptions of world or country economies, political instability, currency
speculation by institutional investors, changes in government policies, buying
and selling of currencies by central banks of countries, trade balances and
changes in interest rates. A trust's foreign currency transactions will be
conducted with foreign exchange dealers acting as principals on a spot (i.e.,
cash) buying basis. These dealers realize a profit based on the difference
between the price at which they buy the currency (bid price) and the price at
which they sell the currency (offer price). The evaluator will estimate the
currency exchange rates based on current activity in the related currency
exchange markets, however, due to the volatility of the markets and other
factors, the estimated rates may not be indicative of the rate a trust might
obtain had the trustee sold the currency in the market at that time.

     ADDITIONAL DEPOSITS.  The trust agreement authorizes the sponsor to
increase the size of a trust and the number of units thereof by the deposit of
additional securities, or cash (including a letter of credit or the equivalent)
with instructions to purchase additional securities, in such trust and the
issuance of a corresponding number of additional units.  If the sponsor deposits
cash, existing and new investors may experience a dilution of their investments
and a reduction in their anticipated income because of fluctuations in the
prices of the securities between the time of the cash deposit and the purchase
of the securities and because a trust will pay the associated brokerage fees and
other acquisition costs.

ADMINISTRATION OF THE TRUST

     DISTRIBUTIONS TO UNITHOLDERS.  Income received by a trust is credited by
the trustee to the Income Account for the trust.  All other receipts are
credited by the trustee to a separate Capital Account for the trust.  The
trustee will normally distribute any income received by a trust on each
distribution date or shortly thereafter to unitholders of record on the


                                      -6-


preceding record date.  Unitholders will receive an amount substantially equal
to their pro rata share of the estimated net annual income distributions to be
received by the trust.  All distributions will be net of applicable expenses.
There is no assurance that any actual distributions will be made since all
dividends received may be used to pay expenses.  In addition, excess amounts
from the Capital Account of a trust, if any, will be distributed at least
annually to the unitholders then of record.  Proceeds received from the
disposition of any of the securities after a record date and prior to the
following distribution date will be held in the Capital Account and not
distributed until the next distribution date applicable to the Capital Account.
The trustee shall be required to make a distribution from the Capital Account if
the cash balance on deposit therein available for distribution shall be
sufficient to distribute at least $0.01 per unit.  The trustee is not required
to pay interest on funds held in the Capital or Income Accounts (but may itself
earn interest thereon and therefore benefits from the use of such funds).

     The distribution to the unitholders as of each record date will be made on
the following distribution date or shortly thereafter and shall consist of an
amount substantially equal to such portion of the unitholders' pro rata share of
the estimated annual income distributions to be received by the trust after
deducting estimated expenses.  Because dividends are not received by a trust at
a constant rate throughout the year, such distributions to unitholders are
expected to fluctuate.  Persons who purchase units will commence receiving
distributions only after such person becomes a record owner.  A person will
become the owner of units, and thereby a unitholder of record, on the date of
settlement provided payment has been received.  Notification to the trustee of
the transfer of units is the responsibility of the purchaser, but in the normal
course of business the selling broker-dealer provides such notice.

     The trustee will periodically deduct from the Income Account of a trust
and, to the extent funds are not sufficient therein, from the Capital Account of
a trust amounts necessary to pay the expenses of the trust.  The trustee also
may withdraw from said accounts such amounts, if any, as it deems necessary to
establish a reserve for any governmental charges payable out of a trust.
Amounts so withdrawn shall not be considered a part of a 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 Income and
Capital Accounts of a trust such amounts as may be necessary to cover
redemptions of units.

     DISTRIBUTION REINVESTMENT.  Unitholders may reinvest distributions into
additional units of their trust without a sales fee.  Your trust will pay any
deferred sales fee per unit regardless of any sales fee discounts.  However, if
you are eligible to receive a discount such that the sales fee you must pay is
less than the applicable deferred sales fee, you will be credited the difference
between your sales fee and the deferred sales fee at the time you buy your
units.  Accordingly, if you reinvest distributions into additional units of your
trust, you will be credited the amount of any remaining deferred sales fee on
such units at the time of reinvestment.

     STATEMENTS TO UNITHOLDERS.  With each distribution, the trustee will
furnish to each unitholder a statement of the amount of income and the amount of
other receipts, if any, which are being distributed, expressed in each case as a
dollar amount per unit.


                                      -7-


     The accounts of a trust are required to be audited annually, at the related
trust's expense, by independent public accountants designated by the sponsor,
unless the sponsor determines that such an audit would not be in the best
interest of the unitholders of the trust.  The accountants' report will be
furnished by the trustee to any unitholder upon written request.  Within a
reasonable period of time after the end of each calendar year, the trustee shall
furnish to each person who at any time during the calendar year was a unitholder
of a trust a statement, covering the calendar year, setting forth for the trust:

     (A)  As to the Income Account:

          (1)  the amount of income received on the securities (including income
               received as a portion of the proceeds of any disposition of
               securities);

          (2)  the amounts paid for purchases of replacement securities or for
               purchases of securities otherwise pursuant to the trust
               agreement, if any, and for redemptions;

          (3)  the deductions, if any, from the Income Account for payment into
               the Reserve Account;

          (4)  the deductions for applicable taxes and fees and expenses of the
               trustee, the depositor, the evaluator, the supervisor, counsel,
               auditors and any other expenses paid by the trust;

          (5)  the amounts reserved for purchases of contract securities, for
               purchases made pursuant to replace failed contract securities or
               for purchases of securities otherwise pursuant to the trust
               agreement, if any;

          (6)  the deductions for payment of the depositor's expenses of
               maintaining the registration of the trust units, if any;

          (7)  the aggregate distributions to unitholders; and

          (8)  the balance remaining after such deductions and distributions,
               expressed both as a total dollar amount and as a dollar amount
               per unit outstanding on the last business day of such calendar
               year;

     (B)  As to the Capital Account:

          (1)  the net proceeds received due to sale, maturity, redemption,
               liquidation or disposition of any of the securities, excluding
               any portion thereof credited to the Income Account;

          (2)  the amount paid for purchases of replacement securities or for
               purchases of securities otherwise pursuant to the trust
               agreement, if any,  and for redemptions;


                                      -8-


          (3)  the deductions, if any, from the Capital Account for payments
               into the Reserve Account;

          (4)  the deductions for payment of applicable taxes and fees and
               expenses of the trustee, the depositor, the evaluator, the
               supervisor, counsel, auditors and any other expenses paid by the
               trust;

          (5)  the deductions for payment of the depositor's expenses of
               organizing the trust;

          (6)  the amounts reserved for purchases of contract securities, for
               purchases made pursuant to replace failed contract securities or
               for purchases of securities otherwise pursuant to the trust
               agreement, if any;

          (7)  the deductions for payment of deferred sales fee and creation and
               development fee,  if any;

          (8)  the deductions for payment of the depositor's expenses of
               maintaining the registration of the trust units, if any;

          (9)  the aggregate distributions to unitholders;  and

          (10) the balance remaining after such distributions and deductions,
               expressed both as a total dollar amount and as a dollar amount
               per unit outstanding on the last business day of such calendar
               year; and

     (C)  the following information:

          (1)  a list of the securities held as of the last business day of such
               calendar year and a list which identifies all securities sold or
               other securities acquired during such calendar year, if any;

          (2)  the number of units outstanding on the last business day of such
               calendar year;

          (3)  the unit value based on the last trust evaluation of such trust
               made during such calendar year; and

          (4)  the amounts actually distributed during such calendar year from
               the Income and Capital Accounts, separately stated, expressed
               both as total dollar amounts and as dollar amounts per unit
               outstanding on the record dates for such distributions.

     RIGHTS OF UNITHOLDERS.  A unitholder may at any time tender units to the
trustee for redemption.  The death or incapacity of any unitholder will not
operate to terminate a trust nor entitle legal representatives or heirs to claim
an accounting or to bring any action or proceeding in any court for partition or


                                      -9-


winding up of a trust.  No unitholder shall have the right to control the
operation and management of a trust in any manner, except to vote with respect
to the amendment of the trust agreement or termination of a trust.

     AMENDMENT AND TERMINATION.  The trust agreement may be amended by the
trustee and the sponsor without the consent of any of the unitholders: (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 provisions as shall not adversely affect the
interests of the unitholders.  The trust agreement with respect to any trust may
also be amended in any respect by the sponsor and the trustee, or any of the
provisions thereof may be waived, with the consent of the holders of units
representing 66 2/3% of the units then outstanding of the trust, provided that
no such amendment or waiver will reduce the interest of any unitholder thereof
without the consent of such unitholder or reduce the percentage of units
required to consent to any such amendment or waiver without the consent of all
unitholders of the trust.  In no event shall the trust agreement be amended to
increase the number of units of a trust issuable thereunder or to permit the
acquisition of any securities 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 unitholders of the
substance of any such amendment.

     The trust agreement provides that a trust shall terminate upon the
liquidation, redemption or other disposition of the last of the securities held
in the trust but in no event is it to continue beyond the mandatory termination
date.  If the value of a trust shall be less than the applicable minimum value
stated in the prospectus (generally 40% of the total value of securities
deposited in the trust during the initial offering period), the trustee may, in
its discretion, and shall, when so directed by the sponsor, terminate the trust.
A trust may be terminated at any time by the holders of units representing 66
2/3% of the units thereof then outstanding.  In addition, the sponsor may
terminate a trust if it is based on a security index and the index is no longer
maintained.  A trust will be liquidated by the trustee in the event that a
sufficient number of units of the trust not yet sold are tendered for redemption
by the sponsor, so that the net worth of the trust would be reduced to less than
40% of the value of the securities at the time they were deposited in the trust.
If a trust is liquidated because of the redemption of unsold units by the
sponsor, the sponsor will refund to each purchaser of units the entire sales
charge paid by such purchaser.

     Beginning nine business days prior to, but no later than, the scheduled
termination date described in the prospectus, the trustee may begin to sell all
of the remaining underlying securities on behalf of unitholders in connection
with the termination of the trust.  The sponsor may assist the trustee in these
sales and receive compensation to the extent permitted by applicable law.  The
sale proceeds will be net of any incidental expenses involved in the sales.

     The sponsor will generally instruct the trustee to sell the securities as
quickly as practicable during the termination proceedings without in its
judgment materially adversely affecting the market price of the securities, but
it is expected that all of the securities will in any event be disposed of
within a reasonable time after a trust's termination.  The sponsor does not
anticipate that the period will be longer than one month, and it could be as
short as one day, depending on the liquidity of the securities being sold.  The


                                      -10-


liquidity of any security depends on the daily trading volume of the security
and the amount that the sponsor has available for sale on any particular day.
Of course, no assurances can be given that the market value of the securities
will not be adversely affected during the termination proceedings.

     Approximately thirty days prior to termination of a trust, the trustee will
notify unitholders of the termination and provide a form allowing qualifying
unitholders to elect an in-kind distribution.  A unitholder who owns the minimum
number of units described in the prospectus may request an in-kind distribution
from the trustee instead of cash.  The trustee will make an in-kind distribution
through the distribution of each of the securities of the trust in book entry
form to the account of the unitholder's bank or broker-dealer at Depository
Trust Company.  The unitholder will be entitled to receive whole shares of each
of the securities comprising the portfolio of a trust and cash from the Capital
Account equal to the fractional shares to which the unitholder is entitled.  The
trustee may adjust the number of shares of any security included in a
unitholder's in-kind distribution to facilitate the distribution of whole
shares.  The sponsor may terminate the in-kind distribution option at any time
upon notice to the unitholders.  Special federal income tax consequences will
result if a unitholder requests an in-kind distribution.

     Within a reasonable period after termination, the trustee will sell any
securities remaining in a trust and, after paying all expenses and charges
incurred by the trust, will distribute to unitholders thereof (upon surrender
for cancellation of certificates for units, if issued) their pro rata share of
the balances remaining in the Income and Capital Accounts of the trust.

     The sponsor may, but is not obligated to, offer for sale units of a
subsequent series of a trust at approximately the time of the mandatory
termination date.  If the sponsor does offer such units for sale, unitholders
may be given the opportunity to purchase such units at a public offering price
that includes a reduced sales fee.  There is, however, no assurance that units
of any new series of a trust will be offered for sale at that time, or if
offered, that there will be sufficient units available for sale to meet the
requests of any or all unitholders.

     THE TRUSTEE.  The trustee is The Bank of New York, a trust company
organized under the laws of New York. The Bank of New York has its principal
unit investment trust division offices at 2 Hanson Place, 12th Floor, Brooklyn,
New York 11217, (800) 221-7668. 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, whose duties are ministerial in nature, has not participated
in selecting the portfolio of any trust.  In accordance with the trust
agreement, the trustee shall keep records of all transactions at its office.
Such records shall include the name and address of, and the number of units held
by, every unitholder of a trust.  Such books and records shall be open to
inspection by any unitholder at all reasonable times during usual business
hours.  The trustee shall make such annual or other reports as may from time to
time be required under any applicable state or federal statute, rule or
regulation.  The trustee shall keep a certified copy or duplicate original of
the trust agreement on file in its office available for inspection at all
reasonable times during usual business hours by any unitholder, together with a


                                      -11-


current list of the securities held in each trust.  Pursuant to the trust
agreement, the trustee may employ one or more agents for the purpose of custody
and safeguarding of securities comprising a trust.

     Under the trust agreement, the trustee or any successor trustee may resign
and be discharged of a trust created by the trust agreement by executing an
instrument in writing and filing the same with the sponsor.

     The trustee or successor trustee must mail a copy of the notice of
resignation to all unitholders then of record, not less than sixty days before
the date specified in such notice when such resignation is to take effect.  The
sponsor upon receiving notice of such resignation is obligated to appoint a
successor trustee promptly.  If, upon such resignation, no successor trustee 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. In case at any time the trustee
shall not meet the requirements set forth in the trust agreement, or shall
become incapable of acting, or if a court having jurisdiction in the premises
shall enter a decree or order for relief in respect of the trustee in an
involuntary case, or the trustee shall commence a voluntary case, under any
applicable bankruptcy, insolvency or other similar law now or hereafter in
effect, or any receiver, liquidator, assignee, custodian, trustee, sequestrator
(or similar official) for the trustee or for any substantial part of its
property shall be appointed, or the trustee shall generally fail to pay its
debts as they become due, or shall fail to meet such written standards for the
trustee's performance as shall be established from time to time by the sponsor,
or if the sponsor determines in good faith that there has occurred either (1) a
material deterioration in the creditworthiness of the trustee or (2) one or more
grossly negligent acts on the part of the trustee with respect to a trust, the
sponsor, upon sixty days' prior written notice, may remove the trustee and
appoint a successor trustee, as hereinafter provided, by written instrument, in
duplicate, one copy of which shall be delivered to the trustee so removed and
one copy to the successor trustee.  Notice of such removal and appointment shall
be mailed to each unitholder by the sponsor.  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.  The trustee must be a corporation organized under the laws of the
United States, or any state thereof, be authorized under such laws to exercise
trust powers and have at all times an aggregate capital, surplus and undivided
profits of not less than $5,000,000.

     THE SPONSOR.  The sponsor of the trust is Fixed Income Securities, L.P.
acting through its Advisor's Asset Management division.  The sponsor is a
broker-dealer specializing in providing services to broker-dealers, registered
representatives, investment advisers and other financial professionals. The
sponsor's headquarters are located at 18925 Base Camp Road, Monument, Colorado
80132. You can contact the Advisor's Asset Management division at 8100 East 22nd
Street North, Suite 900B, Wichita, Kansas 67226-2309 or by using the contacts
listed on the back cover of the prospectus. The sponsor is a registered broker-
dealer and investment adviser and a member of the National Association of
Securities Dealers, Inc. (NASD), the Municipal Securities Rulemaking Board
(MSRB), and the Securities Investor Protection Corporation (SIPC).

     If at any time the sponsor shall fail to perform any of its duties under
the trust agreement or shall become incapable of acting or shall be adjudged a
bankrupt or insolvent or shall have its affairs taken over by public


                                      -12-


authorities, then the trustee may (a) appoint a successor sponsor at rates of
compensation deemed by the trustee to be reasonable and not exceeding such
reasonable amounts as may be prescribed by the Securities and Exchange
Commission, (b) terminate the trust agreement and liquidate any trust as
provided therein, or (c) continue to act as trustee without terminating the
trust agreement.

     THE EVALUATOR AND SUPERVISOR.  Fixed Income Securities, L.P., the sponsor,
also serves as evaluator and supervisor.  The evaluator and supervisor may
resign or be removed by the sponsor and trustee in which event the sponsor or
trustee is to use its best efforts to appoint a satisfactory successor.  Such
resignation or removal shall become effective upon 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.  Notice of such resignation or removal and appointment shall be
mailed by the trustee to each unitholder.

     LIMITATIONS ON LIABILITY.  The sponsor, evaluator, and supervisor are
liable for the performance of their obligations arising from their
responsibilities under the trust agreement but will be under no liability to the
unitholders for taking any action or refraining from any action in good faith
pursuant to the trust agreement or for errors in judgment, except in cases of
its own gross negligence, bad faith or willful misconduct or its reckless
disregard for its duties thereunder.  The sponsor shall not be liable or
responsible in any way for depreciation or loss incurred by reason of the sale
of any securities.

     The trust agreement provides that the trustee shall be under no liability
for any action taken in good faith in reliance upon prima facie properly
executed documents or for the disposition of moneys, securities or certificates
except by reason of its own gross negligence, bad faith or willful misconduct,
or its reckless disregard for its duties under the trust agreement, nor shall
the trustee be liable or responsible in any way for depreciation or loss
incurred by reason of the sale by the trustee of any securities.  In the event
that the sponsor shall fail to act, the trustee may act and shall not be liable
for any such action taken by it in good faith.  The trustee shall not be
personally liable for any taxes or other governmental charges imposed upon or in
respect of the securities or upon the interest thereof.  In addition, the trust
agreement contains other customary provisions limiting the liability of the
trustee.

     The trustee and unitholders may rely on any evaluation furnished by the
evaluator and shall have no responsibility for the accuracy thereof.  The trust
agreement provides that the determinations made by the evaluator 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 or
unitholders for errors in judgment, but shall be liable for its gross
negligence, bad faith or willful misconduct or its reckless disregard for its
obligations under the trust agreement.

     EXPENSES OF THE TRUST.  The sponsor will not charge a trust any fees for
services performed as sponsor.  The sponsor will receive a portion of the sale
commissions paid in connection with the purchase of units and will share in
profits, if any, related to the deposit of securities in the trust.


                                      -13-


     The trustee receives for its services that fee set forth in the prospectus.
The trustee's fee which is calculated and paid monthly is based on the largest
number of units in a trust during the calendar year except during the initial
offering period when it is based on the largest number of units outstanding
during the month preceding payment.  The trustee benefits to the extent there
are funds for future distributions, payment of expenses and redemptions in the
Principal and Income Accounts since these Accounts are non-interest bearing and
the amounts earned by the trustee are retained by the trustee.  Part of the
trustee's compensation for its services to a trust is expected to result from
the use of these funds.

     The supervisor will charge a trust a surveillance fee for services
performed for the trust in an amount not to exceed that amount set forth in the
prospectus but in no event will such compensation, when combined with all
compensation received from other unit investment trusts for which the sponsor
both acts as sponsor and provides portfolio surveillance, exceed the aggregate
cost to the sponsor of providing such services.  Such fee shall be based on the
total number of units of the related trust outstanding as of the January record
date for any annual period, except during the initial offering period the fee
will be based on the units outstanding at the end of each month.

     For evaluation of the securities in a trust, the evaluator shall receive an
evaluation fee in an amount not to exceed that amount set forth in the
prospectus but in no event will such compensation, when combined with all
compensation from other unit investment trusts for which the sponsor acts as
sponsor and provides evaluation services, exceed the aggregate cost of providing
such services.

     For providing bookkeeping and administrative services to a trust, the
sponsor shall receive an administration fee in an amount not to exceed that
amount set forth in the prospectus but in no event will such compensation, when
combined with all compensation from other unit investment trusts for which the
sponsor acts as sponsor and provides evaluation services, exceed the aggregate
cost of providing such services.

     The trustee's fee, sponsor's fees, supervisor's fee and evaluator's fee are
deducted from the Income Account of the related trust to the extent funds are
available and then from the Capital Account.  Each such fee may be increased
without approval of unitholders by amounts not exceeding a proportionate
increase in the Consumer Price Index or any equivalent index substituted
therefor.

     The following additional charges are or may be incurred by the trust:
(a) fees for the trustee's extraordinary services; (b) expenses of the trustee
(including legal and auditing expenses and reimbursement of the cost of advances
to the trust for payment of expenses and distributions, but not including any
fees and expenses charged by an agent for custody and safeguarding of
securities) and of counsel, if any; (c) various governmental charges;
(d) expenses and costs of any action taken by the trustee to protect the trust
or the rights and interests of the unitholders; (e) indemnification of the
trustee for any loss, liability or expense incurred by it in the administration
of the trust not resulting from negligence, bad faith or willful misconduct on
its part or its reckless disregard of its obligations under the trust agreement;
(f) indemnification of the sponsor for any loss, liability or expense incurred


                                      -14-


in acting in that capacity without gross negligence, bad faith or willful
misconduct or its reckless disregard for its obligations under the trust
agreement; and (g) expenditures incurred in contacting unitholders upon
termination of the trust.  The fees and expenses set forth herein are payable
out of a trust and, when owing to the trustee, are secured by a lien on the
trust.  If the balances in the Income and Capital Accounts are insufficient to
provide for amounts payable by the trust, the trustee has the power to sell
securities to pay such amounts.  These sales may result in capital gains or
losses to unitholders.  A trust may pay the costs of updating its registration
statement each year.

PORTFOLIO TRANSACTIONS AND BROKERAGE ALLOCATION

     When a trust sells securities, the composition and diversity of the
securities in the trust may be altered.  In order to obtain the best price for a
trust, it may be necessary for the sponsor to specify minimum amounts in which
blocks of securities are to be sold.  In effecting purchases and sales of a
trust's portfolio securities, the sponsor may direct that orders be placed with
and brokerage commissions be paid to brokers, including brokers which may be
affiliated with the trust, the sponsor or dealers participating in the offering
of units.

PURCHASE, REDEMPTION AND PRICING OF UNITS

     PUBLIC OFFERING PRICE.  Units of a trust are offered at the public offering
price thereof.  The public offering price per unit is equal to the net asset
value per unit plus organization costs plus the applicable sales fee referred to
in the prospectus.  The initial sales fee is equal to the difference between the
maximum sales fee and the remaining deferred sales fee.  The sales fee as a
percentage of the public offering price and the net amount invested is set forth
in the prospectus.  The deferred sales fee is a fixed dollar amount and will be
collected in installments as described in the prospectus.  Units purchased after
the initial deferred sales fee payment will be subject to the remaining deferred
sales fee payments.  Units sold or redeemed prior to such time as the entire
applicable deferred sales fee has been collected will be assessed the remaining
deferred sales fee at the time of such sale or redemption.  During the initial
offering period, a portion of the public offering price includes an amount of
securities to pay for all or a portion of the costs incurred in establishing a
trust.  These costs include the cost of preparing the registration statement,
the trust indenture and other closing documents, registering units with the
Securities and Exchange Commission and states, the initial audit of the trust
portfolio, legal fees and the initial fees and expenses of the trustee.  These
costs will be deducted from a trust as of the end of the initial offering period
or after six months, if earlier. Certain broker-dealers may charge a transaction
fee for processing unit purchases.

     As indicated above, the initial public offering price of the units was
established by dividing the aggregate underlying value of the securities by the
number of units outstanding.  Such price determination as of the opening of
business on the date a trust was created was made on the basis of an evaluation
of the securities in the trust prepared by the evaluator.  After the opening of
business on this date, the evaluator will appraise or cause to be appraised
daily the value of the underlying securities as of the close of regular trading
on the New York Stock Exchange on days the New York Stock Exchange is open and
will adjust the public offering price of the units commensurate with such
valuation.  Such public offering price will be effective for all orders received


                                      -15-


at or prior to the close of regular trading on the New York Stock Exchange on
each such day.  Orders received by the trustee, sponsor or any dealer for
purchases, sales or redemptions after that time, or on a day when the New York
Stock Exchange is closed, will be held until the next determination of price.

     Had units of a trust been available for sale at the close of business on
the business day before the inception date of the trust, the public offering
price would have been as shown under "Essential Information" in the prospectus.
The public offering price per unit of a trust on the date of the prospectus or
on any subsequent date will vary from the amount stated under "Essential
Information" in the prospectus in accordance with fluctuations in the prices of
the underlying securities.  Net asset value per unit is determined by dividing
the value of a trust's portfolio securities, cash and other assets, less all
liabilities (including accrued expenses and mandatory sales fees), by the total
number of units outstanding.  The portfolio securities are valued by the
evaluator as follows: If the security is listed on a national securities
exchange or the Nasdaq Stock Market, the evaluation will generally be based on
the last sale price on the exchange or Nasdaq (unless the evaluator deems the
price inappropriate as a basis for evaluation).  If the security is not so
listed or, if so listed and the principal market for the security is other than
on the exchange or Nasdaq, the evaluation will generally be made by the
evaluator in good faith based on an appraisal of the fair value of the
securities using recognized pricing methods.

     The foregoing evaluations and computations shall be made as of the close of
regular trading on the New York Stock Exchange, on each business day commencing
with the trust's inception date of the securities, effective for all sales made
during the preceding 24-hour period.

     Although payment is normally made three business days following the order
for purchase, payments may be made prior thereto.  A person will become the
owner of units on the date of settlement provided payment has been received.
Cash, if any, made available to the sponsor prior to the date of settlement for
the purchase of units may be used in the sponsor's business and may be deemed to
be a benefit to the sponsor, subject to the limitations of the Securities
Exchange Act of 1934.  If a unitholder desires to have certificates representing
units purchased, such certificates will be delivered as soon as possible
following his written request therefor.

     PUBLIC DISTRIBUTION OF UNITS.  The sponsor intends to qualify the units for
sale in a number of states.  Units will be sold through dealers who are members
of the National Association of Securities Dealers, Inc. and through others.
Sales may be made to or through dealers at prices which represent discounts from
the public offering price as set forth in the prospectus.  Certain commercial
banks may be making units available to their customers on an agency basis.  The
sponsor reserves the right to change the discounts from time to time.  In
addition to such concessions or agency commissions, the sponsor may, from time
to time, pay or allow additional concessions or agency commissions, in the form
of cash or other compensation, to dealers employing registered representatives
who sell, during a specified time period, a minimum dollar amount of units of
unit investment trusts underwritten by the sponsor.  At various times the
sponsor may implement programs under which the sales force of a broker or dealer
may be eligible to win nominal awards for certain sales efforts, or under which


                                      -16-


the sponsor will reallow to any such broker or dealer that sponsors sales
contests or recognition programs conforming to criteria established by the
sponsor, or participates in sales programs sponsored by the sponsor, an amount
not exceeding the total applicable sales charges on the sales generated by such
person at the public offering price during such programs. Also, the sponsor in
its discretion may from time to time pursuant to objective criteria established
by the sponsor pay fees to qualifying brokers or dealers for certain services or
activities which are primarily intended to result in sales of units of a trust.
Such payments are made by the sponsor out of its own assets, and not out of the
assets of any trust.  These programs will not change the price unitholders pay
for their units or the amount that a trust will receive from the units sold.
The difference between the discount and the sales charge will be retained by the
sponsor.

     The sponsor reserves the right to reject, in whole or in part, any order
for the purchase of units.

     PROFITS OF SPONSOR.  The sponsor will receive gross sales fees equal to the
percentage of the offering price of the units of such trusts stated in the
prospectus and will pay a portion of such sales fees to dealers and agents.  In
addition, the sponsor may realize a profit or a loss resulting from the
difference between the purchase prices of the securities to the sponsor and the
cost of such securities to a trust.  The sponsor may also realize profits or
losses with respect to securities deposited in a trust which were acquired from
underwriting syndicates of which the sponsor was a member.  An underwriter or
underwriting syndicate purchases securities from the issuer on a negotiated or
competitive bid basis, as principal, with the motive of marketing such
securities to investors at a profit.  The sponsor may realize additional profits
or losses during the initial offering period on unsold units as a result of
changes in the daily evaluation of the securities in a trust.

     MARKET FOR UNITS.  After the initial offering period, while not obligated
to do so, the sponsor may, subject to change at any time, maintain a market for
units of the trust offered hereby and to continuously offer to purchase said
units at the net asset value determined by the evaluator, provided that the
repurchase price will not be reduced by organization costs during the initial
offering period.  While the sponsor may repurchase units from time to time, it
does not currently intend to maintain an active secondary market for units.
Unitholders who wish to dispose of their units should inquire of their broker as
to current market prices in order to determine whether there is in existence any
price in excess of the redemption price and, if so, the amount thereof.
Unitholders who sell or redeem units prior to such time as the entire deferred
sales fee on such units has been collected will be assessed the amount of the
remaining deferred sales fee at the time of such sale or redemption.  The
offering price of any units resold by the sponsor will be in accord with that
described in the currently effective prospectus describing such units.  Any
profit or loss resulting from the resale of such units will belong to the
sponsor.  If the sponsor decides to maintain a secondary market, it may suspend
or discontinue purchases of units of the trust if the supply of units exceeds
demand, or for other business reasons.

     REDEMPTION.  A unitholder who does not dispose of units in the secondary
market described above may cause units to be redeemed by the trustee by making a
written request to the trustee at its unit investment trust division office and,
in the case of units evidenced by a certificate, by tendering such certificate
to the trustee properly endorsed or accompanied by a written instrument or


                                      -17-


instruments of transfer in form satisfactory to the trustee.  Unitholders must
sign the request, and such certificate or transfer instrument, exactly as their
names appear on the records of the trustee and on any certificate representing
the units to be redeemed.  Additional documentation may be requested, and a
signature guarantee is always required, from corporations, executors,
administrators, trustees, guardians or associations.  The signatures must be
guaranteed by a participant in the Securities Transfer Agents Medallion Program
("STAMP") or such other signature guaranty program in addition to, or in
substitution for, STAMP, as may be accepted by the trustee.  A certificate
should only be sent by registered or certified mail for the protection of the
unitholder.  Since tender of the certificate is required for redemption when one
has been issued, units represented by a certificate cannot be redeemed until the
certificate representing such units has been received by the purchasers.

     Redemption shall be made by the trustee no later than the seventh day
following the day on which a tender for redemption is received (the "Redemption
Date") by payment of cash equivalent to the redemption price, determined as set
forth below under "Computation of Redemption Price," as of the close of regular
trading on the New York Stock Exchange next following such tender, multiplied by
the number of units being redeemed.  Any units redeemed shall be canceled and
any undivided fractional interest in the related trust extinguished.  The price
received upon redemption might be more or less than the amount paid by the
unitholder depending on the value of the securities in the trust at the time of
redemption.  Unitholders who sell or redeem units prior to such time as the
entire deferred sales fee on such units has been collected will be assessed the
amount of the remaining deferred sales fee at the time of such sale or
redemption.  Certain broker-dealers may charge a transaction fee for processing
redemption requests.

     Under regulations issued by the Internal Revenue Service, the trustee is
required to withhold a specified percentage of the principal amount of a unit
redemption if the trustee has not been furnished the redeeming unitholder's tax
identification number in the manner required by such regulations.  Any amount so
withheld is transmitted to the Internal Revenue Service and may be recovered by
the unitholder only when filing a tax return.  Under normal circumstances, the
trustee obtains the unitholder's tax identification number from the selling
broker.  However, any time a unitholder elects to tender units for redemption,
such unitholder should make sure that the trustee has been provided a certified
tax identification number in order to avoid this possible "back-up withholding."
In the event the trustee has not been previously provided such number, one must
be provided at the time redemption is requested.  Any amounts paid on redemption
representing interest shall be withdrawn from the Income Account of a trust to
the extent that funds are available for such purpose.  All other amounts paid on
redemption shall be withdrawn from the Capital Account for a trust.

     Unitholders tendering units for redemption may request a distribution in
kind (a "Distribution In Kind") from the trustee in lieu of cash redemption of
an amount and value of securities per unit equal to the redemption price per
unit as determined as of the evaluation time next following the tender, provided
that the tendering unitholder meets the requirements stated in the prospectus
and the unitholder has elected to redeem at least thirty days prior to the
termination of the trust. If the unitholder meets these requirements, a
Distribution In Kind will be made by the trustee through the distribution of
each of the securities of the trust in book entry form to the account of the


                                      -18-


unitholder's bank or broker-dealer at Depository Trust Company.  The tendering
unitholder shall be entitled to receive whole shares of each of the securities
comprising the portfolio of the trust and cash from the Capital Account equal to
the fractional shares to which the tendering unitholder is entitled.  The
trustee shall make any adjustments necessary to reflect differences between the
redemption price of the units and the value of the securities distributed in
kind as of the date of tender.  If funds in the Capital Account are insufficient
to cover the required cash distribution to the tendering unitholder, the trustee
may sell securities.  The in kind redemption option may be terminated by the
sponsor at any time.

     The trustee is empowered to sell securities in order to make funds
available for the redemption of units.  To the extent that securities are sold
or redeemed in-kind, the size of a trust will be, and the diversity of a trust
may be, reduced but each remaining unit will continue to represent approximately
the same proportional interest in each security.  Sales may be required at a
time when securities would not otherwise be sold and may result in lower prices
than might otherwise be realized.  The price received upon redemption may be
more or less than the amount paid by the unitholder depending on the value of
the securities in the portfolio at the time of redemption.

     The trustee is irrevocably authorized in its discretion, if the sponsor
does not elect to purchase any unit tendered for redemption, in lieu of
redeeming such units, to sell such units in the over-the-counter market for the
account of tendering unitholders at prices which will return to the unitholders
amounts in cash, net after brokerage commissions, transfer taxes and other
charges, equal to or in excess of the redemption price for such units.  In the
event of any such sale, the trustee shall pay the net proceeds thereof to the
unitholders on the day they would otherwise be entitled to receive payment of
the redemption price.

     The right of redemption may be suspended and payment postponed (1) for any
period during which the New York Stock Exchange is closed, other than customary
weekend and holiday closings, or during which (as determined by the Securities
and Exchange Commission) trading on the New York Stock Exchange is restricted;
(2) for any period during which an emergency exists as a result of which
disposal by the trustee of securities is not reasonably practicable or it is not
reasonably practicable to fairly determine the value of the underlying
securities in accordance with the trust agreement; or (3) for such other period
as the Securities and Exchange Commission may by order permit.  The trustee is
not liable to any person in any way for any loss or damage which may result from
any such suspension or postponement.

     COMPUTATION OF REDEMPTION PRICE.  The redemption price for units of each
trust is computed by the evaluator as of the evaluation time stated in the
prospectus next occurring after the tendering of a unit for redemption and on
any other business day desired by it, by:

A.   Adding:  (1) the cash on hand in the trust other than cash deposited in the
     trust to purchase securities not applied to the purchase of such securities
     and (2) the aggregate value of each issue of the securities held in the
     trust as determined by the evaluator as described above;


                                      -19-


B.   Deducting therefrom (1) amounts representing any applicable taxes or
     governmental charges payable out of the trust and for which no deductions
     have been previously made for the purpose of additions to the Reserve
     Account; (2) an amount representing estimated accrued expenses, including
     but not limited to fees and expenses of the trustee (including legal and
     auditing fees), the evaluator, the sponsor and counsel, if any; (3) cash
     held for distribution to unitholders of record as of the business day prior
     to the evaluation being made; and (4) other liabilities incurred by
     the trust, provided that the redemption price will not be reduced by
     organization costs during the initial offering period; and

C.   Finally dividing the results of such computation by the number of units of
     the trust outstanding as of the date thereof.

     RETIREMENT PLANS.  A trust may be suited for purchase by Individual
Retirement Accounts, Keogh Plans, pension funds and other qualified retirement
plans.  Generally, capital gains and income received under each of the foregoing
plans are deferred from Federal taxation.  All distributions from such plans are
generally treated as ordinary income but may, in some cases, be eligible for
special income averaging or tax-deferred rollover treatment.  Investors
considering participation in any such plan should review specific tax laws
related thereto and should consult their attorneys or tax advisers with respect
to the establishment and maintenance of any such plan.  Such plans are offered
by brokerage firms and other financial institutions.  The trust will lower the
minimum investment requirement for IRA accounts.  Fees and charges with respect
to such plans may vary.

     OWNERSHIP OF UNITS.  Ownership of units will not be evidenced by
certificates unless a unitholder, the unitholder's registered broker/dealer or
the clearing agent for such broker/dealer makes a written request to the
trustee.  Units are transferable by making a written request to the trustee and,
in the case of units evidenced by a certificate, by presenting and surrendering
such certificate to the trustee properly endorsed or accompanied by a written
instrument or instruments of transfer which should be sent by registered or
certified mail for the protection of the unitholder.  Unitholders must sign such
written request, and such certificate or transfer instrument, exactly as their
names appear on the records of the trustee and on any certificate representing
the units to be transferred.  Such signatures must be guaranteed as described
above.

     Units may be purchased and certificates, if requested, will be issued in
denominations of one unit or any multiple thereof, subject to the minimum
investment requirement.  Fractions of units, if any, will be computed to three
decimal places.  Any certificate issued will be numbered serially for
identification, issued in fully registered form and will be transferable only on
the books of the trustee.  The trustee may require a unitholder to pay a
reasonable fee, to be determined in the sole discretion of the trustee, for each
certificate re-issued or transferred and to pay any governmental charge that may
be imposed in connection with each such transfer or interchange.  The trustee at
the present time does not intend to charge for the normal transfer or
interchange of certificates.  Destroyed, stolen, mutilated or lost certificates
will be replaced upon delivery to the trustee of satisfactory indemnity
(generally amounting to 3% of the market value of the units), affidavit of loss,
evidence of ownership and payment of expenses incurred.


                                      -20-


PERFORMANCE INFORMATION

     Information contained in this Information Supplement or in the prospectus,
as it currently exists or as further updated, may also be included from time to
time in other prospectuses or in advertising material.  Information on the
performance of a trust strategy or the actual performance of a trust may be
included from time to time in other prospectuses or advertising material and may
reflect sales charges and expenses of a trust.  The performance of a trust may
also be compared to the performance of money managers as reported in SEI Fund
Evaluation Survey or of mutual funds as reported by Lipper Analytical Services
Inc. (which calculates total return using actual dividends on ex-dates
accumulated for the quarter and reinvested at quarter end), Money Magazine Fund
Watch (which rates fund performance over a specified time period after sales
charge and assuming all dividends reinvested) or Wiesenberger Investment
Companies Service (which states fund performance annually on a total return
basis) or of the New York Stock Exchange Composite Index, the American Stock
Exchange Index (unmanaged indices of stocks traded on the New York and American
Stock Exchanges, respectively), the Dow Jones Industrial Average (an index of 30
widely traded industrial common stocks) or the Standard & Poor's 500 Index (an
unmanaged diversified index of 500 stocks) or similar measurement standards
during the same period of time.












                                      -21-


                       Contents of Registration Statement

     This Registration Statement comprises the following papers and documents:
     The facing sheet
     The prospectus
     The signatures
     The consents of the initial evaluator, independent public accountants and
     legal counsel

The following exhibits:

1.1    Trust Agreement (to be filed by amendment).

1.1.1  Standard Terms and Conditions of Trust (to be filed by amendment).

1.2    Certificate of Limited Partnership of Fixed Income Securities, L.P.
       Reference is made to Exhibit 1.2 to the Registration Statement on
       Form S-6 for Advisor's Disciplined Trust, Series 10 (File No. 333-115977)
       as filed on May 28, 2004.

1.3    Agreement of Limited Partnership of Fixed Income Securities, L.P.
       Reference is made to Exhibit 1.3 to the Registration Statement on
       Form S-6 for Advisor's Disciplined Trust, Series 10 (File No. 333-115977)
       as filed on May 28, 2004.

1.4    Articles of Incorporation of Sterling Resources, Inc., general partner of
       Fixed Income Securities, L.P.  Reference is made to Exhibit 1.4 to the
       Registration Statement on Form S-6 for Advisor's Disciplined Trust,
       Series 10 (File No. 333-115977) as filed on May 28, 2004.

2.1    Copy of Certificate of Ownership (included in Exhibit 1.1.1 filed
       herewith and incorporated herein by reference).

2.2    Form of Code of Ethics.  Reference is made to Exhibit 2.2 to the
       Registration Statement on Form S-6 for Advisor's Disciplined Trust,
       Series 10 (File No. 333-115977) as filed on May 28, 2004.

3.1    Opinion of counsel as to legality of securities being registered (to be
       filed by amendment).

3.2    Opinion of counsel as to federal income tax status of securities being
       registered (to be filed by amendment).

3.3    Opinion of counsel as to the New York tax status of securities being
       registered (to be filed by amendment).

4.1    Consent of evaluator (to be filed by amendment).

4.2    Consent of independent auditors (to be filed by amendment).

6.1    List of Officers of Fixed Income Securities, L.P.  Reference is made to
       Exhibit 6.1 to the Registration Statement on Form S-6 for Advisor's
       Disciplined Trust, Series 10 (File No. 333-115977) as filed on May 28,
       2004.

7.1    Power of Attorney.  Reference is made to Exhibit 7.1 to the Registration
       Statement on Form S-6 for Advisor's Disciplined Trust, Series 10
       (File No. 333-115977) as filed on May 28, 2004.


                                      S-1



                                   SIGNATURES

     Pursuant to the requirements of the Securities Act of 1933, the Registrant,
Advisor's Disciplined Trust, Series 21 has duly caused this Registration
Statement to be signed on its behalf by the undersigned, thereunto duly
authorized, in the City of Wichita and State of Kansas on the 30th day of
September, 2004.

                                ADVISOR'S DISCIPLINED TRUST, SERIES 21

                                By FIXED INCOME SECURITIES, L.P., DEPOSITOR


                                By     /s/ ALEX R MEITZNER
                                  -----------------------------
                                         Alex R. Meitzner
                                         Managing Director

     Pursuant to the requirements of the Securities Act of 1933, this
Registration Statement has been signed below on September 30, 2004 by the
following persons in the capacities indicated:


  SIGNATURE              TITLE

Scott Colyer        Director of Sterling           )
                    Resources, Inc., the General   )
                    Partner of Fixed Income        )
                    Securities, L.P.               )

Jack Simkin         Director of Sterling           )
                    Resources, Inc., the General   )
                    Partner of Fixed Income        )
                    Securities, L.P.               )

Jim Dillahunty      Director of Sterling           )
                    Resources, Inc., the General   )
                    Partner of Fixed Income        )
                    Securities, L.P.               )

Joe Cotton          Director of Sterling           )
                    Resources, Inc., the General   )
                    Partner of Fixed Income        )
                    Securities, L.P.               )

Dennis Marlin       Director of Sterling           )
                    Resources, Inc., the General   )
                    Partner of Fixed Income        )
                    Securities, L.P.               )


                                       S-2



Randy Pegg          Director of Sterling           )
                    Resources, Inc., the General   )
                    Partner of Fixed Income        )
                    Securities, L.P.               )

Lisa Colyer         Director of Sterling           )
                    Resources, Inc., the General   )
                    Partner of Fixed Income        )
                    Securities, L.P.               )



                                By     /s/ ALEX R MEITZNER
                                  -----------------------------
                                        Alex R. Meitzner
                                        Attorney-in-Fact*




















- -------------------------------------------------------------------------------
     *An executed copy of each of the related powers of attorney is filed
herewith or incorporated herein by reference as Exhibit 7.1.


                                       S-3