DEFINED ASSET FUNDS MUNICIPAL INVESTMENT TRUST FD PUT SER 10
497, 1999-04-05
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                              DEFINED ASSET FUNDSSM
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                              MUNICIPAL INVESTMENT TRUST FUND
                              PUT SERIES--10
                              (A UNIT INVESTMENT TRUST)
                              O   INTERMEDIATE AND LONG TERM MUNICIPAL BONDS
                              O   DESIGNED FOR FEDERALLY TAX-FREE INCOME
                              O   MONTHLY DISTRIBUTIONS

 

SPONSORS:
Merrill Lynch,                 -------------------------------------------------
Pierce, Fenner & Smith         The Securities and Exchange Commission has not
Incorporated                   approved or disapproved these Securities or
Prudential Securities          passed upon the adequacy of this prospectus. Any
Incorporated                   representation to the contrary is a criminal
Dean Witter Reynolds Inc.      offense.
Salomon Smith Barney Inc.      Prospectus dated April 2, 1999.

 
<PAGE>
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Def ined Asset FundsSM
For more than 28 years, Defined Asset FundsSM has been a leader in unit
investment trust research and product innovation. Our family of Funds helps
investors work toward their financial goals with a full range of quality
investments, including municipal, corporate and government bond portfolios, as
well as domestic and international equity portfolios.
 
Defined Asset Funds offer a number of advantages:
   o Fixed portfolio: Defined Funds follow a buy and hold investment strategy;
     funds are not managed and portfolio changes are limited.
o Preselected Portfolios: We choose the stocks and bonds in advance, so you know
  what you're investing in.
o Professional research: Our dedicated research team seeks out stocks or bonds
      appropriate for a particular fund's objectives.
o Ongoing supervision: We monitor each portfolio on an ongoing basis.
No matter what your investment goals, tolerance for risk or time horizon,
there's probably a Defined Asset Fund that suits your investment style. Your
financial professional can help you select a Defined Asset Fund that works best
for your investment portfolio.
 
THE FINANCIAL INFORMATION IN THIS PROSPECTUS IS OF THE EVALUATION DATE, DECEMBER
31, 1998.
 

CONTENTS
PAGE
                          -----------
Defined Portfolio--
   Risk/Return Summary..................................           3
What You Can Expect From Your Investment................           6
   Monthly Income.......................................           6
   Return Figures.......................................           6
   Records and Reports..................................           6
The Risks You Face......................................           6
   Interest Rate Risk...................................           6
   Call Risk............................................           7
   Reduced Diversification Risk.........................           7
   Collateral Related Risk..............................           7
   Liquidity Risk.......................................           7
   Concentration Risk...................................           7
   Litigation and Legislation Risks.....................           8
Selling or Exchanging Units.............................           8
   Sponsors' Secondary Market...........................           8
   Selling Units to the Trustee.........................           8
   Exchange Option......................................           9
How The Fund Works......................................           9
   Pricing..............................................           9
   Evaluations..........................................           9
   Income...............................................          10
   Expenses.............................................          10
   Portfolio Changes....................................          10
   Fund Termination.....................................          11
   Certificates.........................................          11
   Trust Indenture......................................          11
   Legal Opinion........................................          12
   Auditors.............................................          12
   Sponsors.............................................          12
   Trustee..............................................          12
   Underwriters' and Sponsors' Profits                            13
   Public Distribution..................................          13
   Code of Ethics.......................................          13
   Year 2000 Issues.....................................          13
Taxes...................................................          13
Supplemental Information................................          14
Financial Statements....................................         D-1

 
       2
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PUT SERIES PORTFOLIO--RISK/RETURN SUMMARY
 

       1.  WHAT ARE THE FUND'S OBJECTIVES?
        o  The Fund seeks interest income that is exempt from regular
           federal income taxes by investing in a fixed portfolio
           consisting primarily of intermediate and long term
           municipal industrial development revenue bonds and utility
           bonds with an estimated average life of about 20 years.
        o  The Fund seeks to reduce fluctuations in the value of the
           bonds (and minimize the risk of losing money) through the
           repurchase commitments described below.
       2.  WHAT ARE MUNICIPAL REVENUE BONDS?
           Municipal industrial development revenue bonds are bonds
           issued by states, municipalities and public authorities to
           finance the cost of buying, building or improving various
           projects intended to generate revenue, such as airport,
           healthcare, housing and municipal utilities. Generally,
           payments on these bonds depend solely on the revenues
           generated by the project, excise taxes or state
           appropriations, and are not backed by the government's
           taxing power.
       3.  WHAT IS THE FUND'S INVESTMENT STRATEGY?
        O  The Fund plans to hold to maturity 16 intermediate and long
           term tax-exempt municipal bonds with an aggregate face
           amount of $9,776,563.
        o  The Fund is a unit investment trust which means that,
           unlike a mutual fund, the Portfolio is not managed.
        o  The approximate percentage of the Portfolio backed by each
           Seller's repurchase commitments is:

 
     Astoria Federal Savings Bank            83%
     The Seneca Falls Savings Bank            5%
     The Skaneateles Saving Bank              8%
     Fleet Financial                          2%
     First Union National Bank                2%
 

        o  The bonds were initially acquired from savings banks (the
           Sellers), which had held the bonds in their own portfolios.
        o  43% of the bonds are housing bonds.
        o  1% of the bonds are university/college bonds.
        o  The fund is concentrated 56% in refunded bonds.

 

o          Each Seller has agreed to repurchase on Annual Repurchase
           Dates any of the bonds sold by it to the Fund if:
           -- the Fund needs to sell bonds to meet redemptions of
              units;
           -- the issuer of a bond fails to make payments when due;
           -- the interest on a bond becomes taxable; and
           -- insolvency proceedings are commenced by or against the
              Seller, or it fails to meet its collateral requirements.

 

o          Each Seller has also agreed to repurchase its bonds on
                scheduled disposition dates.
        o  The collateral securing the Sellers' repurchase commitments
           may include:
           -- Ginnie Maes, Fannie Maes and Freddie Macs;
           -- mortgages;
           -- municipal obligations;
           -- corporate obligations;
           -- U.S. government securities; and
           -- cash.
        o  You should rely on the collateral for the performance of
           the repurchase commitments rather than on the financial
           position of the Sellers.
       4.  WHAT ARE THE SIGNIFICANT RISKS?
           YOU CAN LOSE MONEY BY INVESTING IN THE FUND. THIS CAN HAPPEN
           FOR VARIOUS REASONS, INCLUDING:
        o  Rising interest rates, an issuer's worsening financial
           condition or a Seller's failure to meet its repurchase
           commitments can reduce the price of your units.
        o  Assuming no changes in interest rates, when you sell your
           units, they will generally be worth less than your cost
           because your cost included a sales fee.
        o  The Fund could receive early returns of principal if
           underlying mortgages are prepaid, if it becomes necessary to
           liquidate the collateral or if bonds are called or sold
           before they mature. If this happens your income will decline
           and you may not be able to reinvest the money you receive at
           as high a yield or as long a maturity.
        o  100% of the bonds are currently callable.

 
       3
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       5.  IS THIS FUND APPROPRIATE FOR YOU?
           Yes, if you want federally tax-free income. You will
           benefit from a professionally selected and supervised
           portfolio whose risk is reduced by investing in bonds
           backed by collateralized repurchase commitments.
           The Fund is not appropriate for you if you want a
           speculative investment that changes to take advantage of
           market movements, if you do not want a tax-advantaged
           investment or if you cannot tolerate any risk.

 
           DEFINING YOUR INCOME
 

           WHAT YOU MAY EXPECT (Payable on the 25th day of
           the month to holders of record on the 10th day
           of the month):
           Regular Monthly Income per unit                           $    2.47
           Annual Income per unit:                           $   29.68
           These figures are estimates determined on the evaluation
           day; actual payments may vary.

 

       6.  WHAT ARE THE FUND'S FEES AND EXPENSES?
           This table shows the costs and expenses you may pay,
           directly or indirectly, when you invest in the Fund.

 

           INVESTOR FEES
none
           Maximum Sales Fee (Load) on new purchases

 

           ESTIMATED ANNUAL FUND
           OPERATING EXPENSES

 

                        AMOUNT
                      PER UNIT
                    -----------
                     $    0.32
           Trustee's Fee
                     $    0.16
           Portfolio Supervision
           Bookeeping and Administrative
           Fees (including updating
           expenses)
                     $    0.26
           Evaluator's Fee
                     $    1.48
           Other Operating Expenses
                    -----------
                     $    2.22
           TOTAL

 
The Sponsor historically paid updating expenses.
 

       7.  IS THE FUND MANAGED?
           Unlike a mutual fund, the Fund is not managed and bonds are
           not sold because of market changes. Rather, experienced
           Defined Asset Funds financial analysts regularly review the
           bonds in the Fund. The Fund may sell a bond if certain
           adverse credit or other conditions exist.
       8.  HOW DO I BUY UNITS?
           The minimum investment is one unit.
           You can buy units from any of the Sponsors and other
           broker-dealers. The Sponsors are listed later in this
           prospectus. Some banks may offer units for sale through
           special arrangements with the Sponsors, although certain
           legal restrictions may apply.
           UNIT PRICE PER UNIT                       $469.50
           (as of December 31, 1998)
           Unit price is based on the net asset value of the Fund plus
           the sales fee. An amount equal to any principal cash, as
           well as net accrued but undistributed interest on the unit,
           is added to the unit price. An independent evaluator prices
           the bonds at 3:30 p.m. Eastern time every business day.
           Unit price changes every day with changes in the prices of
           the bonds in the Fund.

 
       4
<PAGE>
 

       9.  HOW DO I SELL UNITS?
           You may sell your units at any time to any Sponsor or the
           Trustee for the net asset value determined at the close of
           business on the date of sale, less any remaining deferred
           sales fee. You will not pay any other fee when you sell
           your units.

 

      10.  HOW ARE DISTRIBUTIONS MADE AND TAXED?
           The Fund pays income monthly.
           In the opinion of bond counsel when each bond was issued,
           interest on the bonds in this Fund is generally 100% exempt
           from regular federal income tax.
           You will also receive principal payments if bonds are sold
           or called or mature, when the cash available is more than
           $5.00 per unit. You will be subject to tax on any gain
           realized by the Fund on the disposition of bonds.
 
      11.  WHAT OTHER SERVICES ARE AVAILABLE?
           REINVESTMENT
           You will receive your income in cash unless you choose to
           compound your income by reinvesting at no sales fee in the
           Municipal Fund Investment Accumulation Program, Inc. This
           Program is an open-end mutual fund with a comparable
           investment objective. Income from this Program will
           generally be subject to state and local income taxes. For
           more complete information about the Program, including
           charges and fees, ask the Trustee for the Program's
           prospectus. Read it carefully before you invest. The Trustee
           must receive your written election to reinvest at least 10
           days before the record day of an income payment.
           EXCHANGE PRIVILEGES
           You may exchange units of this Fund for units of certain
           other Defined Asset Funds. You may also exchange into this
           Fund from certain other funds. We charge a reduced sales fee
           on most exchanges.

 
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    TAX-FREE VS. TAXABLE INCOME: A COMPARISON OF TAXABLE AND TAX-FREE YIELDS
 
<TABLE>
<CAPTION>

  EFFECTIVE
TAXABLE INCOME 1999*               % TAX                         TAX-FREE YIELD OF
  SINGLE RETURN    JOINT RETURN   BRACKET    3%     3.5%     4%     4.5%     5%     5.5%     6%     6.5%
                        IS EQUIVALENT TO A TAXABLE YIELD OF
- ----------------------------------------------------------------------------------------------------------
<S>        <C>    <C>       <C>      <C>       <C>    <C>      <C>    <C>      <C>     <C>     <C>     <C> 
 $      0- 25,750 $      0- 43,050   15.00     3.53   4.12     4.71   5.29     5.88    6.47    7.06    7.65
- ----------------------------------------------------------------------------------------------------------
$ 25,751- 62,450 $ 43,051-104,050   28.00     4.17   4.86     5.56   6.25     6.94    7.64    8.33    9.03
- ----------------------------------------------------------------------------------------------------------
$ 62,451-130,250 $104,051-158,550   31.00     4.35   5.07     5.80   6.52     7.25    7.97    8.70    9.42
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$130,251-283,150 $158,551-283,150   36.00     4.69   5.47     6.25   7.03     7.81    8.59    9.38   10.16
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OVER $283,151       OVER $283,151   39.60     4.97   5.79     6.62   7.45     8.28    9.11    9.93   10.76
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</TABLE>

 
To compare the yield of a taxable security with the yield of a federally
tax-free security, find your taxable income and read across. The table
incorporates 1999 federal income tax rates and assumes that all income would
otherwise be taxed at a U.S. investor's highest tax rate. Yield figures are for
example only.
 
*Based upon net amount subject to federal income tax after deductions and
exemptions. This table does not reflect the possible effect of other tax
factors, such as alternative minimum tax, personal exemptions, the phase-out of
exemptions, itemized deductions, the possible partial disallowance of deductions
or state and local taxation. Consequently, investors are urged to consult their
own tax advisers in this regard.
 
       5
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WHAT YOU CAN EXPECT FROM YOUR INVESTMENT
 
MONTHLY INCOME
 
The Fund will pay you regular monthly income. Your monthly income may vary
because of:
   o elimination of one or more bonds from the Fund's portfolio because of
     calls, redemptions or sales;
   o a change in the Fund's expenses; or
   o the failure by a bond's issuer to pay interest.
 
Changes in interest rates generally will not affect your income because the
portfolio is fixed.
 
Along with your income, you will receive your share of any available bond
principal.
 
RETURN FIGURES
 
We cannot predict your actual return, which will vary with unit price, how long
you hold your investment and changes in the portfolio, interest income and
expenses.
 
Estimated Current Return equals the estimated annual cash to be received from
the bonds in the Fund less estimated annual Fund expenses, divided by the Unit
Price (including the maximum sales fee):
 

 Estimated Annual                  Estimated
 Interest Income        -       Annual Expenses
- -------------------------------------------------
                   Unit Price

 
Estimated Long Term Return is a measure of the estimated return over the
estimated life of the Fund. Unlike Estimated Current Return, Estimated Long Term
Return reflects maturities, discounts and premiums of the bonds in the Fund. It
is an average of the yields to maturity (or in certain cases, to an earlier call
date) of the individual bonds in the portfolio, adjusted to reflect the Fund's
maximum sales fee and estimated expenses. We calculate the average yield for the
portfolio by weighting each bond's yield by its market value and the time
remaining to the call or maturity date.
 
Yields on individual bonds depend on many factors including general conditions
of the bond markets, the size of a particular offering and the maturity and
quality rating of the particular issues. Yields can vary among bonds with
similar maturities, coupons and ratings.
 
These return quotations are designed to be comparative rather than predictive.
 
RECORDS AND REPORTS
 
You will receive:
o a monthly statement of income payments and any principal payments;
o a notice from the Trustee when new bonds are deposited in exchange or
  substitution for bonds originally deposited;
o an annual report on Fund activity; and
o annual tax information. This will also be sent to the IRS. You must report the
  amount of tax-exempt interest received during the year.
 
You may request:
o copies of bond evaluations to enable you to comply with federal and state tax
  reporting requirements; and
o audited financial statements of the Fund.
 
You may inspect records of Fund transactions at the Trustee's office during
regular business hours.
 
THE RISKS YOU FACE
 
INTEREST RATE RISK
 
Investing involves risks, including the risk that your investment will decline
in value if interest
 
       6
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rates rise. Generally, bonds with longer maturities will change in value more
than bonds with shorter maturities. Bonds in the Fund are more likely to be
called when interest rates decline. This would result in early returns of
principal to you and may result in early termination of the Fund. Of course, we
cannot predict how interest rates may change.
 
CALL RISK
 
All the bonds in this Fund are currently callable by the issuer.
 
If the bonds are called, your income will decline and you may not be able to
reinvest the money you receive at as high a yield or as long a maturity. An
early call at par of a premium bond will reduce your return.
 
REDUCED DIVERSIFICATION RISK
 
If many investors sell their units, the Fund will have to sell bonds. This could
reduce the diversification of your investment and increase your share of Fund
expenses.
 
LIQUIDITY RISK
 
You can always sell back your units, but we cannot assure you that a liquid
trading market will always exist for the bonds in the portfolio, especially
since current law may restrict the Fund from selling bonds to any Sponsor. The
bonds will generally trade in the over-the-counter market. The value of the
bonds, and of your investment, may be reduced if trading in bonds is limited or
absent.
 
COLLATERAL RELATED RISK
 
The Sponsors believe that the collateral is reasonably adequate to support the
repurchase commitments without regard to the ability of the Sellers to meet
these commitments.
 
You could have all or part of the principal amount of your investment returned
early if insolvency proceedings are commenced by or against a Seller. In that
case, the collateral agent will automatically foreclose on the collateral and,
if necessary, liquidate it and use the proceeds to purchase bonds from the Fund.
You would then receive your share of the proceeds.
 
The Sponsors have agreed that their sole recourse in the event a Seller fails to
repurchase the bonds as agreed, including as a result of the Seller's
insolvency, will be to exercise available remedies with respect to the
collateral on deposit with the Fund. If the collateral is not enough to cover
the costs resulting from the Seller's default, the Sponsors will be unable to
pursue any deficiency judgment against the Seller.
 
CONCENTRATION RISK
 
When a certain type of bond makes up 25% or more of the portfolio, it is said to
be 'concentrated' in that bond type, which makes the Portfolio less diversified.
 
Here is what you should know about the Fund's concentration in housing bonds.
Multi-family housing revenue bonds and single family mortgage revenue bonds are
issued to provide financing for various housing projects. These bonds are
payable primarily from the revenue derived from mortgage loans to housing
projects for low to moderate income familities or notes secured by mortgages on
residences. Repayment of these bonds is dependent upon, among other things:
   o occupany levels;
   o rental income;
   o the default rate on the underlying mortgage loans;
   o the ability of mortgage insurers to pay claims;
 
       7
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   o the continued availability of federal, state or local housing subsidiary
     programs;
   o economic conditions in local markets;
   o construction costs;
   o taxes;
   o utility costs;
   o the level of operating expenses; and
   o the managerial ability of project managers.
 
Housing bonds generally may be prepaid at any time. Therefore, their average
life will ordinarily be less then their stated maturity.
 
Here is what you should know about the fund's concentration in refunded bonds.
 
Refunded bonds are typically:
   o backed by direct obligations of the U.S. government; or
   o in some cases, backed by obligations guaranteed by the U.S. government and
      placed in escrow with an independent trustee;
   o noncallable prior to maturity; but
   o sometimes called for redemption prior to maturity.
 
Changes to the portfolio from bond redemptions, maturities and sales may affect
the Fund's concentrations over time.
 
LITIGATION AND LEGISLATION RISKS
 
We do not know of any pending litigation that might have a material adverse
effect upon the Fund.
 
Future tax legislation could affect the value of the portfolio by:
   o limiting real property taxes,
   o reducing tax rates,
   o imposing a flat or other form of tax, or
   o exempting investment income from tax.
 
SELLING OR EXCHANGING UNITS
 
You can sell your units at any time for a price based on net asset value. Your
net asset value is calculated each business day by:
   o adding the value of the bonds, net accrued interest, cash and any other
     Fund assets;
   o subtracting accrued but unpaid Fund expenses, unreimbursed Trustee
      advances, cash held to buy back units or for distribution to investors and
     any other Fund liabilities; and
   o dividing the result by the number of outstanding units.
 
Your net asset value when you sell may be more or less than your cost because of
sales fees, market movements and changes in the portfolio.
 
SPONSORS' SECONDARY MARKET
 
While we are not obligated to do so, we will buy back units at net asset value
without any other fee or charge. We may resell the units to other buyers or to
the Trustee. You should consult your financial professional for current market
prices to determine if other broker-dealers or banks are offering higher prices.
 
We have maintained the secondary market continuously for over 25 years, but we
could discontinue it without prior notice for any business reason.
 
SELLING UNITS TO THE TRUSTEE
 
Regardless of whether we maintain a secondary market, you can sell your units to
the Trustee at any time by sending the Trustee a letter (with any outstanding
certificates if you hold Unit certificates). You must properly endorse your
certificates (or execute a written transfer instrument with signatures
guaranteed
 
       8
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by an eligible institution). Sometimes, additional documents are needed such as
a trust document, certificate of corporate authority, certificate of death or
appointment as executor, administrator or guardian.
 
Within seven days after your request and the necessary documents are received,
the Trustee will mail a check to you. Contact the Trustee for additional
information.
 
As long as we are maintaining a secondary market, the Trustee will sell your
units to us at a price based on net asset value. If there is no secondary
market, the Trustee may sell your units in the over-the-counter market for a
higher price, but it is not obligated to do so. In that case, you will receive
the net proceeds of the sale.
 
If the Fund does not have cash available to pay you for units you are selling,
the agent for the Sponsors will select bonds to be sold. Bonds will be selected
based on market and credit factors. These sales could be made at times when the
bonds would not otherwise be sold and may result in your receiving less than the
unit par value and also reduce the size and diversity of the Fund.
 
There could be a delay in paying you for your units:
   o if the New York Stock Exchange is closed (other than customary weekend and
      holiday closings);
   o if the SEC determines that trading on the New York Stock Exchange is
     restricted or that an emergency exists making sale or evaluation of the
     bonds not reasonably practicable; and
   o for any other period permitted by SEC order.
 
EXCHANGE OPTION
 
You may exchange units of certain Defined Asset Funds for units of this Fund
with no sales fee. You may exchange units of this Fund for units of certain
other Defined Asset Funds at a reduced sales fee if your investment goals
change. To exchange units, you should talk to your financial professional about
what funds are exchangeable, suitable and currently available.
 
Normally, an exchange is taxable and you must recognize any gain or loss on the
exchange. However, the IRS may try to disallow a loss if the portfolios of the
two funds are not materially different; you should consult your own tax adviser.
 
We may amend or terminate this exchange option at any time without notice.
 
HOW THE FUND WORKS
 
PRICING
 
The price of a unit includes interest accrued on the bonds, less expenses, from
the initial most recent Record Day up to, but not including, the settlement
date, which is usually three business days after the purchase date of the unit.
 
A portion of the price of a unit consists of cash so that the Trustee can
provide you with regular monthly income. When you sell your units you will
receive your share of this cash.
 
EVALUATIONS
 
An independent Evaluator values the bonds on each business day (excluding
Saturdays, Sundays and the following holidays as observed by the New York Stock
Exchange: New Year's Day, Presidents' Day, Martin
 
       9
<PAGE>
Luther King, Jr. Day, Good Friday, Memorial Day, Independence Day, Labor Day,
Thanksgiving and Christmas). Bond values are based on current bid or offer
prices for the bonds or comparable bonds. In the past, the difference between
bid and offer prices of publicly offered tax-exempt bonds has ranged from 0.5%
of face amount on actively traded issues to 3.5% on inactively traded issues;
the difference has averaged between 1 and 2%.
 
INCOME
 
The Trustee credits interest to an Income Account and other receipts to a
Capital Account. The Trustee may establish a Reserve Account by withdrawing from
these accounts amounts it considers appropriate to pay any material liability.
These accounts do not bear interest.
 
PLACEMENT FEE
 
The Sponsors receive a quarterly placement fee from each Seller equal to an
annual percentage ranging from 0.487% to 0.75% of the outstanding principal
amount of bonds sold by that Seller and held by the Fund.
 
EXPENSES
 
The Trustee is paid monthly. It also benefits when it holds cash for the Fund in
non-interest bearing accounts. The Trustee may also receive additional amounts:
   o to reimburse the Trustee for the Fund's operating expenses;
   o for extraordinary services and costs of indemnifying the Trustee and the
      Sponsors;
   o costs of actions taken to protect the Fund and other legal fees and
     expenses;
   o expenses for keeping the Fund's registration statement current; and
   o Fund termination expenses and any governmental charges.
 
The Sponsors are currently reimbursed up to 45 cents per $1,000 face amount
annually for providing portfolio supervisory, bookkeeping and administrative
services and for any other expenses properly chargeable to the Fund. Legal,
typsesetting, electronic filing and regulatory filing fees and expenses
associated with updating the Fund's registration statement yearly are also now
chargeable to the Fund. While this fee may exceed the amount of these costs and
expenses attributable to this Fund, the total of these fees for all Series of
Defined Asset Funds will not exceed the aggregate amount attributable to all of
these Series for any calendar year. The Fund also pays the Evaluator's fees.
 
The Trustee's, Sponsors' and Evaluator's fees may be adjusted for inflation
without investors' approval.
 
The Sponsors will pay advertising and selling expenses at no charge to the Fund.
If Fund expenses exceed initial estimates, the Fund will owe the excess. The
Trustee has a lien on Fund assets to secure reimbursement of Fund expenses and
may sell bonds if cash is not available.
 
PORTFOLIO CHANGES
 
The Sponsors and Trustee are not liable for any default or defect in a bond; if
a contract to buy any bond.
 
Unlike a mutual fund, the portfolio is designed to remain intact and we may keep
bonds in the portfolio even if their credit quality declines or other adverse
financial circumstances occur. However, we may sell a bond in certain cases if
 
       10
<PAGE>
we believe that certain adverse credit conditions exist or if a bond becomes
taxable.
 
If we maintain a secondary market in units but are unable to sell the units that
we buy in the secondary market, we will redeem units, which will affect the size
and composition of the portfolio. Units offered in the secondary market may not
represent the same face amount of bonds that they did originally.
 
We decide whether or not to offer units for sale that we acquire in the
secondary market after reviewing:
   o diversity of the portfolio;
   o size of the Fund relative to its original size;
   o ratio of Fund expenses to income;
   o current and long-term returns;
   o degree to which units may be selling at a premium over par; and
   o cost of maintaining a current prospectus.
 
FUND TERMINATION
 
The Fund will terminate following the stated maturity or sale of the last bond
in the portfolio. The Fund may also terminate earlier with the consent of
investors holding 51% of the units or if total assets of the Fund have fallen
below 40% of the face amount of bonds deposited. We will decide whether to
terminate the Fund early based on the same factors used in deciding whether or
not to offer units in the secondary market.
 
When the Fund is about to terminate you will receive a notice, and you will be
unable to sell your units after that time. On or shortly before termination, we
will sell any remaining bonds, and you will receive your final distribution. Any
bond that cannot be sold at a reasonable price may continue to be held by the
Trustee in a liquidating trust pending its final sale.
 
You will pay your share of the expenses associated with termination, including
brokerage costs in selling bonds. This may reduce the amount you receive as your
final distribution.
 
CERTIFICATES
 
Certificates for units are issued on request. You may transfer certificates by
complying with the requirements for redeeming certificates, described above. You
can replace lost or mutilated certificates by delivering satisfactory indemnity
and paying the associated costs.
 
TRUST INDENTURE
 
The Fund is a 'unit investment trust' governed by a Trust Indenture, a contract
among the Sponsors, the Trustee and the Evaluator, which sets forth their duties
and obligations and your rights. A copy of the Indenture is available to you on
request to the Trustee. The following summarizes certain provisions of the
Indenture.
 
The Sponsors and the Trustee may amend the Indenture without your consent:
   o to cure ambiguities;
   o to correct or supplement any defective or inconsistent provision;
   o to make any amendment required by any governmental agency; or
   o to make other changes determined not to be materially adverse to your best
     interest (as determined by the Sponsors).
Investors holding 51% of the units may amend the Indenture. Every investor must
consent to any amendment that changes the 51% requirement. No amendment may
reduce your interest in the Fund without your written consent.
 
       11
<PAGE>
The Trustee may resign by notifying the Sponsors. The Sponsors may remove the
Trustee without your consent if:
 
   o it fails to perform its duties and the Sponsors determine that its
     replacement is in your best interest; or
   o it becomes incapable of acting or bankrupt or its affairs are taken over by
      public authorities.
Investors holding 51% of the units may remove the Trustee. The Evaluator may
resign or be removed by the Sponsors and the Trustee without the consent of
investors. The resignation or removal of either becomes effective when a
successor accepts appointment. The Sponsors will try to appoint a successor
promptly; however, if no successor has accepted within 30 days after notice of
resignation, the resigning Trustee or Evaluator may petition a court to appoint
a successor.
Any Sponsor may resign as long as one Sponsor with a net worth of $2 million
remains and agrees to the resignation. The remaining Sponsors and the Trustee
may appoint a replacement. If there is only one Sponsor and it fails to perform
its duties or becomes bankrupt the Trustee may:
   o remove it and appoint a replacement Sponsor;
   o liquidate the Fund; or
   o continue to act as Trustee without a Sponsor.
Merrill Lynch, Pierce, Fenner & Smith Incorporated acts as agent for the
Sponsors.
The Trust Indenture contains customary provisions limiting the liability of the
Trustee, the Sponsors and the Evaluator.
 
LEGAL OPINION
Davis Polk & Wardwell, 450 Lexington Avenue, New York, New York 10017, as
counsel for the Sponsors, has given an opinion that the units are validly
issued. Special counsel located in the relevant states have given state and
local tax opinions.
 
AUDITORS
Deloitte & Touche LLP, 2 World Financial Center, New York, New York 10281,
independent accountants, audited the Statement of Condition included in this
prospectus.
 
SPONSORS
The Sponsors are:
 
MERRILL LYNCH, PIERCE, FENNER & SMITH INCORPORATED (a wholly-owned subsidiary of
Merrill Lynch & Co., Inc.)
P.O. Box 9051,
Princeton, NJ 08543-9051
DEAN WITTER REYNOLDS INC. (a principal operating subsidiary of Morgan Stanley
Dean Witter & Co.)
Two World Trade Center--59th Floor,
New York, NY 10048
SALOMON SMITH BARNEY INC. (an indirectly wholly-owned subsidiary of Citigroup
Inc.)
388 Greenwich Street--23rd Floor,
New York, NY 10013
 
PRUDENTIAL SECURITIES INCORPORATED (an
indirect wholly-owned subsidiary of the
Prudential Insurance Company of America)
One New York Plaza
New York, NY 10292
 
Each Sponsor is a Delaware corporation and it, or its predecessor, has acted as
sponsor to many unit investment trusts. As a registered broker-dealer each
Sponsor buys and sells securities (including investment company shares) for
others (including investment companies) and participates as an underwriter in
various selling groups.
 
TRUSTEE
 
The Bank of New York, 101 Barclay Street, 17 W, New York, New York 10268, is the
Trustee. It is supervised by the Federal Deposit Insurance Corporation, the
Board of Governors of the Federal Reserve System and New York State banking
authorities.
 
       12
<PAGE>
UNDERWRITERS' AND SPONSORS' PROFITS
Underwriters receive sales charges when they sell units. The Sponsors also
realized a profit or loss on the initial date of deposit of the bonds. Any cash
made available by you to the Sponsors before the settlement date for those units
may be used in the Sponsors' businesses to the extent permitted by federal law
and may benefit the Sponsors.
A Sponsor or Underwriter may realize profits or sustain losses on bonds in the
Fund which were acquired from underwriting syndicates of which it was a member.
In maintaining a secondary market, the Sponsors will also realize profits or
sustain losses in the amount of any difference between the prices at which they
buy units and the prices at which they resell or redeem them.
 
PUBLIC DISTRIBUTION
The Sponsors do not intend to qualify units for sale in any foreign countries.
This prospectus does not constitute an offer to sell units in any country where
units cannot lawfully be sold.
 
CODE OF ETHICS
Merrill Lynch, as agent for the Sponsors, has adopted a code of ethics requiring
preclearance and reporting of personal securities transactions by its employees
with access to information on portfolio transactions. The goal of the code is to
prevent fraud, deception or misconduct against the Fund and to provide
reasonable standards of conduct.
 
YEAR 2000 ISSUES
Many computer systems were designed in such a way that they may be unable to
distinguish between the year 2000 and the year 1900 (commonly known as the 'Year
2000 Problem'). We do not expect that the computer system changes necessary to
prepare for the Year 2000 will cause any major operational difficulties for the
Fund. The Year 2000 Problem may adversely affect the issuers of the securities
contained in the Portfolio, but we cannot predict whether any impact will be
material to the Fund as a whole.
 
TAXES
The following summary describes some of the important income tax consequences of
holding units. It assumes that you are not a dealer in securities, financial
institution, insurance company or other investor with special circumstances. You
should consult your own tax adviser about your particular circumstances.
At the date of issue of each bond, counsel for the issuer delivered an opinion
to the effect that interest on the bond is exempt from regular federal income
tax. However, interest may be subject to state and local taxes and federal
alternative minimum tax. Neither we nor our counsel have reviewed the issuance
of the bonds, related proceedings or the basis for the opinions of counsel for
the issuers. We cannot assure you that the issuer (or other users) have complied
or will comply with any requirements necessary for a bond to be tax-exempt. If
any of the bonds were determined not to be tax-exempt, you could be required to
pay income tax for current and prior years, and if the Fund were to sell the
bond, it might have to sell it at a substantial discount.
In the opinion of our counsel, under existing law:
 
GENERAL TREATMENT OF THE FUND AND YOUR INVESTMENT
The Fund will not be taxed as a corporation for federal income tax purposes, and
you will be considered to own directly your share of each bond in the Fund.
Our counsel is of the opinion that the Fund (and therefore the investors, as
discussed below) will be treated as owning the bonds, notwithstanding the
Sellers' repurchase commitments. However, because there are no regulations,
published rulings or judicial decisions that characterize for federal income tax
purposes repurchase commitments like the
 
       13
<PAGE>
Sellers' with respect to the bonds, it is not certain that the IRS will agree
with the conclusions of our counsel. Therefore, it is possible that the IRS may
take actions that might result in the Fund (and therefore the investors) not
being treated as owning the bonds for federal income tax purposes.
 
INCOME OR LOSS UPON DISPOSITION
When all or part of your share of a bond is disposed of (for example, when the
Fund sells, exchanges or redeems a bond or when you sell or exchange your
units), you will generally recognize capital gain or loss. While not free from
doubt, the opinion of our counsel is that any capital gain or loss derived from
the Fund will be short-term capital gain or loss regardless of the time that you
have held your Units.
 
YOUR BASIS IN THE BONDS
You may be required to allocate a portion of your cost for your Units to the
Sellers' repurchase commitment with respect to the bonds. When all or part of
your pro rata portion of a bond is disposed of (and the commitment with respect
to that bond simultaneously is disposed of, lapses or is exercised), both your
basis in your pro rata portion of the bond and your basis in your pro rata
portion of the commitment will be taken into account in determining your overall
net income or loss from the disposition. In some cases, this overall net income
or loss may consist of ordinary income attributable to market discount on the
pro rata portion of the bond and of capital loss attributable to the commitment.
The deductibility of capital losses is subject to limitations. You should
consult your tax adviser in this regard.
If your basis for your pro rata portion of a bond (after giving effect to any
required allocation to the commitment) exceeds the redemption price at maturity
of that bond, you may be considered to have purchased your pro rata portion of
the bond at a 'bond premium,' which must be amortized.
 
EXPENSES
If you are not a corporate investor, you will not be entitled to a deduction for
your share of fees and expenses of the Fund. Also, if you borrowed money in
order to purchase or carry your units, you will not be able to deduct the
interest on this borrowing for federal income tax purposes. The IRS may treat
your purchase of units as made with borrowed money even if the money is not
directly traceable to the purchase of units.
 
STATE AND LOCAL TAXES
Under the income tax laws of the State and City of New York, the Fund will not
be taxed as a corporation. If you are a New York taxpayer, your income from the
Fund will not be tax-exempt in New York except to the extent that the income is
earned on bonds that are tax-exempt for New York purposes. Depending on where
you live, your income from the Fund may be subject to state and local taxation.
You should consult your tax adviser in this regard.
 
SUPPLEMENTAL INFORMATION
You can receive at no cost supplemental information about the Fund by calling
the Trustee. The supplemental information includes more detailed risk disclosure
about the types of bonds that may be in the Fund's portfolios, general risk
disclosure concerning any insurance securing certain bonds, and general
information about the structure and operation of the Fund. The supplemental
information is also available from the SEC.
 
                                          14


DEFINED ASSET FUNDS - MUNICIPAL INVESTMENT TRUST FUND,
PUT SERIES - 10


REPORT OF INDEPENDENT ACCOUNTANTS


The Sponsors, Trustee and Holders
  of Defined Asset Funds - Municipal Investment Trust Fund,
  Put Series - 10:
 

We have audited the accompanying statement of condition of Defined
Asset Funds - Municipal Investment Trust Fund, Put Series - 10,
including the portfolio, as of December 31, 1998 and the related
statements of operations and of changes in net assets for the years
ended December 31, 1998, 1997 and 1996. These financial statements are
the responsibility of the Trustee. Our responsibility is to express an
opinion on these financial statements based on our audits.

We conducted our audits in accordance with generally accepted auditing
standards. Those standards require that we plan and perform the audit
to obtain reasonable assurance about whether the financial statements
are free of material misstatement. An audit includes examining, on a
test basis, evidence supporting the amounts and disclosures in the
financial statements. Securities owned at December 31, 1998, as shown
in such portfolio, were confirmed to us by The Bank of New York, the
Trustee. An audit also includes assessing the accounting principles
used and significant estimates made by the Trustee, as well as
evaluating the overall financial statement presentation. We believe
that our audits provide a reasonable basis for our opinion.

In our opinion, the financial statements referred to above present
fairly, in all material respects, the financial position of Defined
Asset Funds - Municipal Investment Trust Fund, Put Series - 10 at
December 31, 1998 and the results of its operations and changes in its
net assets for the above-stated years in conformity with generally
accepted accounting principles.


DELOITTE & TOUCHE LLP

New York, N.Y.
March 12, 1999


                                                   D - 1
<PAGE>

DEFINED ASSET FUNDS - MUNICIPAL INVESTMENT TRUST FUND,
PUT SERIES -  10
 
STATEMENT OF CONDITION
AS OF DECEMBER 31, 1998
 
<TABLE>
<S>                                                <C>          <C>
TRUST PROPERTY:
  Investment in marketable securities - at value
    (cost $9,768,146)(Note 1).....................                $    9,924,589
  Securities called for redemption
    (cost $33,396)(Note 5).........................                        33,366
  Accrued interest receivable.....................                        78,953
                                                                 __________________
 
              Total trust property................                    10,036,908
 
LESS LIABILITIES:
  Advance from Trustee............................       24,814
  Accrued expenses................................       12,465           37,279
                                                   _____________ ___________________
 
NET ASSETS, REPRESENTED BY:
  21,240,003 units of fractional undivided
    interest outstanding (Note 3).................  $ 9,957,998
  Undistributed net investment income.............       41,631
                                                   _____________
                                                                      $9,999,629
                                                                 ===================
UNIT VALUE ($9,999,629/21,240,003 units)..........                      $0.47079
                                                                 ===================

 
</TABLE>
                         See Notes to Financial Statements.
 
 



                                                   D - 2
<PAGE>

DEFINED ASSET FUNDS - MUNICIPAL INVESTMENT TRUST FUND,
PUT SERIES - 10
 
STATEMENTS OF OPERATIONS
 
<TABLE>
<CAPTION>
                                             .......Years Ended December 31,..........
                                                  1998         1997         1996
                                             ________________________________________
<S>                                        <C>          <C>          <C>
INVESTMENT INCOME:
  Interest income...........................    $733,149     $764,789     $977,706
  Sales charge(Note 6)......................     (23,645)     (20,863)     (29,255)
  Trustee's fees and expenses...............     (22,019)     (21,819)     (22,187)
  Sponsors' fees............................      (4,205)      (3,701)      (5,151)
  Insurance expenses........................ _________________________________________
 
  Net investment income.....................     683,280      718,406      921,113
                                             ________________________________________
 
REALIZED AND UNREALIZED GAIN (LOSS)
  ON INVESTMENTS:
  Realized gain on securities sold
    or redeemed.............................      14,119        3,637       10,691
  Unrealized appreciation (depreciation)
    of investments..........................      25,090       34,382      (50,667)
                                             ________________________________________
 
  Net realized and unrealized gain (loss)
    on investments..........................      39,209       38,019      (39,976)
                                             ________________________________________
 
NET INCREASE IN NET ASSETS RESULTING
  FROM OPERATIONS...........................    $722,489     $756,425     $881,137
                                             ========================================
 
 
</TABLE>
                                 See Notes to Financial Statements.
 



                                                   D - 3
<PAGE>

DEFINED ASSET FUNDS - MUNICIPAL INVESTMENT TRUST FUND,
PUT SERIES - 10
 
STATEMENTS OF CHANGES IN NET ASSETS
 
<TABLE>
<CAPTION>
                                               .......Years Ended December 31,..........
                                                   1998         1997     1996
                                               _________________________________________
<S>                                          <C>          <C>          <C>
OPERATIONS:
  Net investment income....................... $   683,280  $   718,406    $   921,113
  Realized gain on securities sold
    or redeemed...............................      14,119        3,637         10,691
  Unrealized appreciation (depreciation)
    of investments............................      25,090       34,382        (50,667)
                                               _________________________________________
  Net increase in net assets resulting
    from operations...........................     722,489      756,425        881,137
                                               _________________________________________
 
DISTRIBUTIONS TO HOLDERS (Note 2):
  Income......................................    (709,202)    (776,109)      (960,685)
  Principal...................................  (1,264,205)    (487,458)    (3,242,499)

  Total distributions.........................  (1,973,407)  (1,263,567)    (4,203,184)
                                               _________________________________________
NET DECREASE IN NET ASSETS....................  (1,250,918)    (507,142)    (3,322,047)
 
NET ASSETS AT BEGINNING OF YEAR...............  11,250,547   11,757,689     15,079,736
                                               _________________________________________
NET ASSETS AT END OF YEAR.....................  $9,999,629  $11,250,547    $11,757,689
                                               =========================================
PER UNIT:
  Income distributions during year............    $0.03339     $0.03654       $0.04523
                                               =========================================
  Principal distributions during year.........    $0.05952     $0.02295       $0.15266
                                               =========================================
  Net asset value at end of year..............    $0.47079     $0.52969       $0.55356
                                               =========================================
TRUST UNITS OUTSTANDING AT END OF YEAR........  21,240,003   21,240,003     21,240,003
                                               =========================================
 
 
</TABLE>
                  See Notes to Financial Statements.
 



                                                   D - 4
<PAGE>

DEFINED ASSET FUNDS - MUNICIPAL INVESTMENT TRUST FUND,
PUT SERIES - 10


NOTES TO FINANCIAL STATEMENTS


  1.  SIGNIFICANT ACCOUNTING POLICIES

      The Fund is registered under the Investment Company Act of 1940 as
      a Unit Investment Trust. The following is a summary of significant
      accounting policies consistently followed by the Fund in the
      preparation of its financial statements. The policies are in
      conformity with generally accepted accounting principles.

      (a) Securities are stated at value as determined by the Evaluator
          based on bid side evaluations for the securities. See "How to
          Sell Units - Trustee's Redemption of Units" in this Prospectus,
          Part B.

      (b) The Fund is not subject to income taxes. Accordingly, no
          provision for such taxes is required.

      (c) Interest income is recorded as earned.

  2.  DISTRIBUTIONS

      A distribution of net investment income is made to Holders each
      month. Receipts other than interest, after deductions for
      redemptions and applicable expenses, are distributed as explained
      in "Income, Distributions and Reinvestment - Distributions" in this
      Prospectus, Part B.

  3.  NET CAPITAL
<TABLE>
      <S>                                                    <C>
      Cost of 21,240,003 units at Date of Deposit.........   $21,186,930
      Realized gain on securities sold or redeemed........       122,699
      Principal distributions.............................   (11,508,044)
      Net unrealized appreciation of investments..........       156,413
                                                           ______________
 
      Net capital applicable to Holders...................    $9,957,998
                                                           ==============
 </TABLE>

  4.  INCOME TAXES

      As of December 31, 1998, net unrealized appreciation of investments,
      based on cost for Federal income tax purposes, aggregated $159,413
      (including securities called for redemption) of which 156,443
        related to appreciated securities and $30 related to depreciated
      securities. The cost of investment securities for Federal income tax
      purposes was $9,801,542 at December 31, 1998.

                                                   D - 5
<PAGE>

DEFINED ASSET FUNDS - MUNICIPAL INVESTMENT TRUST FUND,
PUT SERIES - 10


NOTES TO FINANCIAL STATEMENTS


  5.  SECURITIES CALLED FOR REDEMPTION

      $20,000 face amount of New York State Housing Finance Agency,
      Hospital and Nursing Home Project Bonds, 1977 Ser. A, $6,937
      face amount of Honolulu Private Nonprofit Housing Corporation,
      HI, Mortgage Revenue Limited Obligation Bonds, $3,055 face amount
      of Housing Finance Corporation of Rock Springs, Wyoming, Mortgage
      Revenue Note (Bicentennial Village) and $3,374 face amount of
      Leavenworth, KS, Hsg. Fin. Corp., Hsg. Rev. Oblig., Ser. 1978 were
      called for redemption on January 6,1999, January 1, 1999,
      January 1, 1999 and January 1,1999 respectively. Such securities
      are valued at the amount of the proceeds subsequently received.

  6.  SALES CHARGE

      There was no initial sales charge for units. Instead, the Fund is
      subject to a deferred sales charge of .203% per annum of the
      outstanding principal amount of the securities. This sales charge
      is deducted from interest income earned on the securities and is
      paid to the sponsors on each distribution date.

                                                   D - 6

<PAGE>


DEFINED ASSET FUNDS - MUNICIPAL INVESTMENT TRUST FUND,
PUT SERIES - 10
 
PORTFOLIO
AS OF DECEMBER 31, 1998
<TABLE>
<CAPTION>
                                                                                                          Optional
    Portfolio No. and Title of                 Face                        Disposition   Redemption
            Securities(4)                     Amount  Coupon Maturities(2) Dates(3)      Provisions(2)       Cost      Value(1)
            _____________                     ______  ______ _____________ _____________  _____________      ____      ________
 <S>                                 <C>           <C>     <C>           <C>          <C>             <C>          <C>
   FLEET FINANCIAL
 1 Heartland Consumers Power District    $   250,000  7.000%     2016       01/01/15      Currently   $   244,840   $   298,507
   South Dakota, Electric System Revenue
   Bonds Ser. 1979
 
   ASTORIA FEDERAL SAVINGS BANK:
 2 Honolulu Private Nonprofit Housing      4,238,075  6.875      2020       07/01/18      Currently     4,238,075     4,238,075
   Corporation, HI, Mortgage Revenue
   Limited Obligation Bonds
 
 3 Leavenworth, KS, Hsg. Fin. Corp.,       1,848,189  6.625      2019       11/01/17      Currently     1,848,189     1,848,189
   Hsg. Rev. Oblig., Ser. 1978
 
 4 Housing Finance Corporation of Rock     1,980,299  7.500      2020       06/01/18      Currently     1,980,299     1,980,299
   Springs, Wyoming, Mortgage Revenue
   Note (Bicentennial Village)
 
   THE SENECA FALLS SAVINGS BANK:
 5 Massachusetts Port. Authority,            100,000  5.625      2012       07/01/11      Currently        99,166       106,144
   Revenue Bonds, Ser. 1973
 
 6 New York State Housing Finance             25,000  6.875      2007       11/01/06      Currently        25,038        27,087
   Agency, Hospital and Nursing Home
   Project Bonds, 1977 Ser. A
 
 7 New York State Housing Finance            110,000  6.000      2012       11/01/11      Currently       110,000       125,523
   Agency, Hospital and Nursing Home
   Project Bonds, 1974 Ser. A
 
 8 New York State Housing Finance             65,000  7.000      2017       11/01/16      Currently        65,130        76,237
   Agency, Hospital and Nursing Home
   Project Bonds, 1977 Ser. A
 
 9 New York State Medical Care               210,000  9.375      2016       11/01/15      Currently       211,596       219,431
   Facilities Finance Agency, Hospital
   and Nursing Home Project Revenue
   Bonds, Ser. 1975 A

</TABLE>
                                                                 D - 7

<PAGE>



DEFINED ASSET FUNDS - MUNICIPAL INVESTMENT TRUST FUND,
PUT SERIES - 10
 
PORTFOLIO
AS OF DECEMBER 31, 1998
<TABLE>
<CAPTION>
                                                                                                          Optional
    Portfolio No. and Title of                 Face                        Disposition   Redemption
            Securities(4)                     Amount  Coupon Maturities(2) Dates(3)      Provisions(2)       Cost      Value(1)
            _____________                     ______  ______ _____________ _____________  _____________      ____      ________
 <S>                                 <C>           <C>     <C>           <C>          <C>             <C>          <C>
10 New York State Medical Care          $    100,000  7.400%     2016       11/01/15      Currently  $    100,522  $    102,334
   Facilities Finance Agency, Hospital       100,000  7.400      2016       11/01/15      Currently       100,522       102,334
   and Nursing Home Project Revenue
   Bonds, Ser. 1979 A
 
11 Richmond, VA, Metropolitan Authority,      80,000  5.400      2013       01/15/12      Currently        79,160        81,686
   5.40% Expressway Refunding Revenue,
   Ser. of 1973
 
12 Richmond, VA, Metropolitan Authority,       5,000  5.400      2013       01/15/12      Currently         4,947         5,000
   5.40% Expressway Refunding Revenue,
   Ser. of 1973
 
   THE SKANEATELES SAVINGS BANK:
13 City of New York, Gen. Oblig. Bonds       250,000  5.000      2003       03/01/03      Currently       247,378       261,290
                                             100,000  5.000      2005       03/01/05      Currently        98,951       105,317

 
14 New York State Dorm. Auth., City          100,000  7.300      2006       07/01/05      Currently       100,349       110,198
   Univ. Comm. Coll. Iss. Rev. Bonds,
   Ser. D
 
15 New York State Housing Finance             15,000  6.400      2001       05/01/00      Currently        15,000        15,344
   Agency, State University Construction
   Bonds, 1978 Ser. B
 
   FIRST UNION NATIONAL BANK:
16 Bergen County Utility Authority, New      200,000  6.400      2009       12/15/08      Currently       198,984       221,594
   Jersey Revenue Refunding Bonds, Ser.
   1978
 
                                       ______________                                                 ______________ _____________
TOTAL                                     $9,776,563                                                    $9,768,146    $9,924,589
                                       ==============                                                 ============== =============
 
</TABLE>

            See Notes to Portfolio.
 
                                                                 D - 8
<PAGE>




DEFINED ASSET FUNDS - MUNICIPAL INVESTMENT TRUST FUND,
PUT SERIES - 10


NOTES TO PORTFOLIO
AS OF DECEMBER 31, 1998

   (1) See Notes to Financial Statements.

   (2) Optional redemption provisions, which may be exercised in whole
       or in part, are initially at prices of par plus a premium, then
       subsequently at prices declining to par. Certain securities may
       provide for redemption at par prior or in addition to any
       optional or mandatory redemption dates or maturity, for
       example, through the operation of a maintenance and replacement
       fund, if proceeds are not able to be used as contemplated, the
       project is condemned or sold or the project is destroyed and
       insurance proceeds are used to redeem the securities. Many of
       the securities are also subject to mandatory sinking fund
       redemption commencing on dates which may be prior to the date
       on which securities may be optionally redeemed. Sinking fund
       redemptions are at par and redeem only part of the issue. Some
       of the securities have mandatory sinking funds which contain
       optional provisions permitting the issuer to increase the
       principal amount of securities called on a mandatory redemption
       date. The sinking fund redemptions with optional provisions
       may, and optional refunding redemptions generally will, occur
       at times when the redeemed securities have an offering side
       evaluation which represents a premium over par. To the extent
       that the securities were acquired at a price higher than the
       redemption price, this will represent a loss of capital when
       compared with the Public Offering Price of the Units when
       acquired. Distributions will generally be reduced by the amount
       of the income which would otherwise have been paid with respect
       to redeemed securities and there will be distributed to Holders
       any principal amount and premium received on such redemption
       after satisfying any redemption requests for Units received by
       the Fund. The estimated current return may be affected by
       redemptions. The tax effect on Holders of redemptions and
       related distributions is described under "Taxes" in this
       Prospectus, Part B.

   (3) Each security in the fund is backed by repurchase commitments
       by a Seller. Each Seller has committed, in order to provide
       liquidity , to repurchase on fourteen days notice any security
       sold by seller to the fund at its Put Price plus accrued
       interest in the event that it is necessary to sell any securities
       to meet redemptions of Units (should redemptions be made despite
       the market-making activity of the Sponsor). In addition, each
       Seller has committed to repurchase any securities sold by that
       Seller to the Fund on scheduled Disposition Dates and in the
       event that the securities are in default or are deemed to be
       taxable.  The Trustee has been instructed to cause the Seller
       to purchase each security at its Original Purchase Price on
       the Disposition Date specified unless on or before this date it
       can be sold, in the opinion of the Sponsors, for a net amount in
       excess of its Original Purchase Price.  For additional information
       about such arrangements, see "Risk Factors" and "Risk Factors -
       Obligations Backed by Letters of Credit or Guarantees; Repurchase
       Commitments; Collateralized Obligations" in this Prospectus,
       Parts A and B, respectively.



                                                   D - 9
<PAGE>

DEFINED ASSET FUNDS - MUNICIPAL INVESTMENT TRUST FUND,
PUT SERIES - 10


NOTES TO PORTFOLIO
AS OF DECEMBER 31, 1998

   (4) All the securities in the Fund have been purchased from savings
       banks or savings and loan associations (the "Sellers"), each of
       which has committed to repurchase any security sold by it to the
       Fund upon the occurrence of certain events. Any repurchase is at
       a price not less than the original purchase price to the Fund plus
       interest accrued to the date of repurchase.
       These repurchase commitments are backed by collateral.
 
       There is no assurance as to the continuing ability of Issuers of the
       securities to meet their principal and interest requirements.
       Additionally, if a receiver or conservator is appointed for a Seller,
       Federal banking regulators may refuse to honor the Seller's repurchase
       commitments and Holders could be left without the full protection
       afforded by the collateral. In that case, the liquidity of the Fund's
       portfolio could be impaired.


                                                   D - 10





<PAGE>
                             Defined
                             Asset FundsSM
 

HAVE QUESTIONS ?                         MUNICIPAL INVESTMENT TRUST FUND
Request the most                         PUT SERIES--10
recent free Information                  (A Unit Investment Trust)
Supplement that gives more               ---------------------------------------
details about the Fund,                  This Prospectus does not contain
by calling:                              complete information about the
The Bank of New York                     investment company filed with the
1-800-221-7771                           Securities and Exchange Commission in
                                         Washington, D.C. under the:
                                         o Securities Act of 1933 (file no.
                                         2-94965) and
                                         o Investment Company Act of 1940 (file
                                         no. 811-1777).
                                         TO OBTAIN COPIES AT PRESCRIBED RATES--
                                         WRITE: Public Reference Section of the
                                         Commission
                                         450 Fifth Street, N.W., Washington,
                                         D.C. 20549-6009
                                         CALL: 1-800-SEC-0330.
                                         VISIT: http://www.sec.gov.
                                         ---------------------------------------
                                         No person is authorized to give any
                                         information or representations about
                                         this Fund not contained in this
                                         Prospectus or the Information
                                         Supplement, and you should not rely on
                                         any other information.
                                         ---------------------------------------
                                         When units of this Fund are no longer
                                         available, this Prospectus may be used
                                         as a preliminary prospectus for a
                                         future series, but some of the
                                         information in this Prospectus will be
                                         changed for that series.
                                         Units of any future series may not be
                                         sold nor may offers to buy be accepted
                                         until that series has become effective
                                         with the Securities and Exchange
                                         Commission. No units can be sold in any
                                         State where a sale would be illegal.

 
                      12785--4/99


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