LEGG MASON INCOME TRUST INC
497, 1995-05-09
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<PAGE>
TABLE OF CONTENTS
<TABLE>
<S>                                                      <C>
      Prospectus Highlights                                2
      Fund Expenses                                        3
      Financial Highlights                                 4
      Performance Information                              5
      The Fund's Investment Objective and
        Policies                                           6
      How You Can Invest in the Fund                      12
      How Your Shareholder Account is Maintained          13
      How You Can Redeem Your Primary Shares              13
      How Net Asset Value Is Determined                   14
      Dividends and Other Distributions                   14
      Tax Treatment of Dividends and Other
        Distributions                                     15
      Shareholder Services                                16
      Investing through Tax-Deferred Retirement
        Plans                                             17
      The Fund's Board of Directors, Manager and
        Investment Adviser                                17
      The Fund's Distributor                              18
      Description of the Corporation and its
        Shares                                            19
</TABLE>
 
ADDRESSES
DISTRIBUTOR:
      Legg Mason Wood Walker, Inc.
      111 South Calvert Street
      P.O. Box 1476, Baltimore, MD 21203-1476
      410(Bullet)539(Bullet)0000    800(Bullet)822(Bullet)5544
TRANSFER AND SHAREHOLDER SERVICING AGENT:
      Boston Financial Data Services
      P.O. Box 953, Boston, MA 02103
COUNSEL:
      Kirkpatrick & Lockhart
      1800 M Street, N.W., Washington, DC 20036
INDEPENDENT ACCOUNTANTS:
      Coopers & Lybrand L.L.P.
      217 East Redwood Street, Baltimore, Maryland 21202
      NO PERSON HAS BEEN AUTHORIZED TO GIVE ANY INFORMATION OR TO MAKE ANY
      REPRESENTATIONS NOT CONTAINED IN THIS PROSPECTUS OR THE STATEMENT OF
      ADDITIONAL INFORMATION IN CONNECTION WITH THE OFFERING MADE BY THE
      PROSPECTUS AND, IF GIVEN OR MADE, SUCH INFORMATION OR REPRESENTATIONS MUST
      NOT BE RELIED UPON AS HAVING BEEN AUTHORIZED BY THE FUND OR ITS
      DISTRIBUTOR. THE PROSPECTUS DOES NOT CONSTITUTE AN OFFERING BY THE FUND OR
      BY THE PRINCIPAL UNDERWRITER IN ANY JURISDICTION IN WHICH SUCH OFFERING
      MAY NOT LAWFULLY BE MADE.
      (Recycle Logo) PRINTED ON RECYCLED PAPER
      LMF-025

                                   PROSPECTUS
                                  MAY 1, 1995
                                   LEGG MASON
                                      U.S.
                                   GOVERNMENT
                                 INTERMEDIATE-
                                      TERM
                                   PORTFOLIO
                                 PRIMARY SHARES
                           PUTTING YOUR FUTURE FIRST
                       (Logo of Legg Mason appears here) 
<PAGE>
     THE LEGG MASON U.S. GOVERNMENT INTERMEDIATE-TERM PORTFOLIO -- PRIMARY
     SHARES
     PROSPECTUS
          The Legg Mason U.S. Government Intermediate-Term Portfolio ("Fund") is
      a professionally managed portfolio seeking to provide investors with high
      current income consistent with prudent investment risk and liquidity
      needs. The Fund is a separate portfolio of Legg Mason Income Trust, Inc.
      ("Corporation"), a diversified open-end management investment company
      which currently has four portfolios. In seeking to achieve the Fund's
      objective, the Fund's investment adviser, Western Asset Management Company
      ("Adviser"), under normal circumstances, invests at least 75% of the
      Fund's total assets in obligations issued or guaranteed by the U.S.
      Government, its agencies or instrumentalities, or instruments secured by
      such securities. The Fund expects to maintain an average dollar-weighted
      maturity of between three and ten years.
          The Adviser believes that shares of the Fund may be appropriate both
      for direct investment and for investment in Individual Retirement Accounts
      and other qualified retirement plans.
          The Primary Class of Shares ("Primary Shares") offered in this
      Prospectus is available to all investors except certain institutions (see
      page 4). No initial sales charge is payable on purchases, and no
      redemption charge is payable on sales, of Primary Shares of the Fund. The
      Fund pays management fees to its Manager, Legg Mason Fund Adviser, Inc.
      ("Manager"), and distribution fees with respect to Primary Shares to its
      Distributor, Legg Mason Wood Walker, Incorporated ("Legg Mason"), as
      described on pages 17-19 of this Prospectus.
          This Prospectus sets forth concisely the information about the Fund
      that a prospective investor ought to know before investing. It should be
      retained for future reference. A Statement of Additional Information about
      the Fund dated May 1, 1995 has been filed with the Securities and Exchange
      Commission ("SEC") and, as amended or supplemented from time to time, is
      incorporated herein by reference. The Statement of Additional Information
      is available without charge upon request from Legg Mason (address and
      telephone numbers listed below).
      THESE SECURITIES HAVE NOT BEEN APPROVED OR DISAPPROVED BY THE SECURITIES
      AND EXCHANGE COMMISSION OR ANY STATE SECURITIES COMMISSION NOR HAS THE
      SECURITIES AND EXCHANGE COMMISSION OR ANY STATE SECURITIES COMMISSION
      PASSED UPON THE ACCURACY OR ADEQUACY OF THIS PROSPECTUS. ANY
      REPRESENTATION TO THE CONTRARY IS A CRIMINAL OFFENSE.
      Dated: May 1, 1995
      Legg Mason Wood Walker, Inc.
      111 South Calvert Street
      P.O. Box 1476
      Baltimore, MD 21203-1476
      410 (Bullet) 539 (Bullet) 0000
      800 (Bullet) 822 (Bullet) 5544

<PAGE>
     PROSPECTUS HIGHLIGHTS
     THE LEGG MASON U.S. GOVERNMENT INTERMEDIATE-TERM PORTFOLIO-PRIMARY SHARES
          The following summary is qualified in its entirety by the more
      detailed information appearing in the body of this Prospectus.
FUND TYPE:
          The Fund is a separate portfolio of Legg Mason Income Trust, Inc., an
      open-end, diversified management investment company. You may purchase or
      redeem Primary Shares of the Fund through a brokerage account with Legg
      Mason or certain of its affiliates. See "How You Can Invest in the Fund,"
      page 12, and "How You Can Redeem Your Primary Shares," page 13.
FUND STARTED:
          August 7, 1987
NET ASSETS:
          Over $234.8 million as of February 28, 1995
INVESTMENT OBJECTIVE AND POLICIES:
          The Fund's investment objective is to obtain high current income
      consistent with prudent investment risk and liquidity needs. The Fund
      attempts to meet this objective by investing at least 75% of the Fund's
      total assets in obligations issued or guaranteed by the U.S. Government,
      its agencies or instrumentalities, or instruments secured by such
      securities. Of course, there can be no assurance that the Fund will
      achieve its objective. The value of the debt instruments held by the Fund,
      and thus the net asset value of Fund shares, generally fluctuates
      inversely with movements in market interest rates. Certain investment
      grade debt securities in which the Fund invests may have speculative
      characteristics. The Fund's participation in hedging and option income
      strategies also involves certain investment risks and transaction costs.
      See "The Fund's Investment Objective and Policies," page 6.
DISTRIBUTOR:
          Legg Mason Wood Walker, Incorporated
MANAGER AND ADVISER:
          Legg Mason Fund Adviser, Inc. serves as the Fund's manager, and
      Western Asset Management Company serves as investment adviser to the Fund.
TRANSFER AND SHAREHOLDER SERVICING AGENT:
          Boston Financial Data Services
CUSTODIAN:
          State Street Bank and Trust Company
EXCHANGE PRIVILEGE:
          All funds in the Legg Mason Family of Funds. See "Exchange Privilege,"
      page 16.
DIVIDENDS:
          Declared daily and paid monthly.
REINVESTMENT:
          All dividends and other distributions are automatically reinvested in
      Primary Shares unless cash payments are requested.
INITIAL PURCHASE:
          $1,000 minimum, generally.
SUBSEQUENT PURCHASES:
          $100 minimum, generally. See "How You Can Invest in the Fund," page
      12.
PURCHASE METHODS:
          Send bank/personal check or wire federal funds.
PUBLIC OFFERING PRICE PER SHARE:
          Net asset value
2

<PAGE>
     FUND EXPENSES
    The purpose of the following table is to assist an investor in understanding
the various costs and expenses that an investor in Primary Shares of the Fund
will bear directly or indirectly. The expenses and fees set forth in the table
are based on average net assets and annual Fund operating expenses related to
Primary Shares for the year ended December 31, 1994, adjusted for current
expense and fee waiver levels.
<TABLE>
<S>                                            <C>
SHAREHOLDER TRANSACTION EXPENSES
Maximum sales charge on purchases or
  reinvested dividends                           None
Redemption and exchange fees                     None
ANNUAL FUND OPERATING EXPENSES -- PRIMARY
SHARES
(AS A PERCENTAGE OF AVERAGE NET ASSETS)
Management fees                                 0.55 %
12b-1 fees                                      0.50 %
Other expenses                                  0.14 %
Less: Reimbursement of fees (1)                (0.24)%
Total operating expenses                        0.95 %
</TABLE>
 
(1) The expense ratio for Primary Shares would have been 1.19% had the Fund's
Manager not agreed to reimburse fees. The reimbursement agreement, wherein the
Manager has agreed to continue to reimburse fees and/or assume other expenses to
the extent the expenses attributable to Primary Shares (exclusive of taxes,
interest, brokerage and extraordinary expenses) exceed during any month an
annual rate of 0.95% of average daily net assets (Primary Shares) for such
month, will remain in effect until October 31, 1995, or until net assets reach
$400 million, whichever occurs first, and unless extended will terminate on that
date.
    Because the Fund pays a 12b-1 fee with respect to Primary Shares, long-term
shareholders in Primary Shares may pay more in distribution expenses than the
economic equivalent of the maximum front-end sales charge permitted by the
National Association of Securities Dealers, Inc. ("NASD"). For further
information concerning Fund expenses, see "The Fund's Board of Directors,
Manager and Investment Adviser," page 17.
EXAMPLE OF EFFECT OF FUND EXPENSES
    The following example illustrates the expenses that you would pay on a
$1,000 investment in Primary Shares over various time periods assuming (1) a 5%
annual rate of return and (2) full redemption at the end of each time period. As
noted in the table above, the Fund charges no redemption fees of any kind.
<TABLE>
<CAPTION>
1 YEAR     3 YEARS     5 YEARS     10 YEARS
<S>        <C>         <C>         <C>
 $ 10        $30         $53         $117
</TABLE>
 
    This example assumes that all dividends and other distributions are
reinvested and that the percentage amounts listed under "Annual Fund Operating
Expenses" remain the same over the time periods shown. The above tables and the
assumption in the example of a 5% annual return are required by regulations of
the SEC applicable to all mutual funds. THE ASSUMED 5% ANNUAL RETURN IS NOT A
PREDICTION OF, AND DOES NOT REPRESENT, THE PROJECTED OR ACTUAL PERFORMANCE OF
PRIMARY SHARES. THE ABOVE TABLES SHOULD NOT BE CONSIDERED A REPRESENTATION OF
PAST OR FUTURE EXPENSES. ACTUAL EXPENSES MAY BE GREATER OR LESS THAN THOSE
SHOWN. The actual expenses attributable to Primary Shares will depend upon,
among other things, the level of average net assets, the levels of sales and
redemptions of shares, and the extent to which Primary Shares incur variable
expenses, such as transfer agency costs.
                                                                               3
 
<PAGE>
     FINANCIAL HIGHLIGHTS
         Effective December 1, 1994, the Fund commenced the sale of a second
     class of shares, known as Navigator Shares. Navigator Shares are currently
     offered for sale only to institutional clients of the Fairfield Group, Inc.
     ("Fairfield") for investment of their own funds and funds for which they
     act in a fiduciary capacity, to clients of Legg Mason Trust Company ("Trust
     Company") for which Trust Company exercises discretionary investment
     management responsibility, to qualified retirement plans managed on a
     discretionary basis and having net assets of at least $200 million, and to
     The Legg Mason Profit Sharing Plan and Trust. Navigator Shares pay no 12b-1
     distribution fees and may pay lower transfer agency fees. The information
     for Primary Shares reflects the 12b-1 fees paid by that Class.
         The financial highlights for the period August 7, 1987 (commencement of
     operations) to December 31, 1987 and for the years ended December 31, 1988
     through 1994 have been derived from financial statements which have been
     audited by Coopers & Lybrand L.L.P., independent accountants. The Fund's
     financial statements for the year ended December 31, 1994 and the report of
     Coopers & Lybrand L.L.P. thereon are included in the Fund's annual report
     and are incorporated by reference in the Statement of Additional
     Information. The annual report is available to shareholders without charge
     by calling your Legg Mason or affiliated investment executive or Legg
     Mason's Funds Marketing Department at 800-822-5544.
<TABLE>
<CAPTION>
                                                                                                                          AUGUST 7,
                                                                          PRIMARY CLASS                                      TO
                          NAVIGATOR CLASS                       FOR THE YEARS ENDED DECEMBER 31,                       DECEMBER 31,
                              1994(1)    1994        1993      1992       1991         1990        1989       1988      1987
<S>                           <C>         <C>         <C>       <C>        <C>          <C>         <C>        <C>       <C>
PER SHARE OPERATING
  PERFORMANCE:
      Net asset value,
        beginning of period $9.72       $10.43     $10.70     $10.77      $10.29      $10.20      $ 9.79     $9.92      $10.00
      Net investment income  0.05(3)      0.51(2)    0.53(2)    0.60(2)     0.72(2)     0.78(2)     0.80(2)   0.74(2)     0.30(2)
      Net realized and
        unrealized gain
        (loss) on
        investments          --          (0.71)      0.17       0.05        0.70        0.09        0.41      (0.12)     (0.08)
      Total from investment
        operations           0.05        (0.20)      0.70       0.65        1.42        0.87        1.21       0.62       0.22
      Distributions to
        shareholders:
        Net investment
          income            (0.05)       (0.51)     (0.53)     (0.60)      (0.72)      (0.78)      (0.80)     (0.74)     (0.30)
        Net realized gain
          on investments     --           --        (0.39)     (0.12)      (0.22)       --          --        (0.01)      --
        In excess of net
          realized gain on
          investments        --           --        (0.05)      --          --          --          --         --         --
      Net asset value, end
        of period           $9.72       $ 9.72     $10.43     $10.70      $10.77      $10.29      $10.20      $9.79     $ 9.92
      Total return           0.50%**     (1.93)%     6.6%       6.3%       14.4%        9.1%       12.8%       6.4%       2.2%**
RATIOS/SUPPLEMENTAL DATA:
  Ratios to average net
    assets:
    Expenses             0.4%(3)      0.9%(2)(4) 0.9%(2)(4) 0.9%(2)(4)  0.8%(2)(4)  0.6%(2)(4)  0.8%(2)(4) 1.0%(2)(4) 1.0%(2)(4)
                 (double dagger)                                                                                     (double dagger)
    Net investment
      income             6.4%(3)      5.1%(2)    4.8%(2)    5.5%(2)     6.7%(2)     7.7%(2)     7.9%(2)    7.4%(2)    7.4%(2)
                 (double dagger)
  Portfolio turnover
    rate               315.7%       315.7%     490.2%     512.6%      642.8%       67.0%       57.3%     132.5%      66.3%
  Net assets, end of
    period (in
    thousands)         $4,024     $231,255   $299,529   $307,320    $211,627     $74,423     $43,051    $27,087    $16,617
</TABLE>
       * Commencement of operations.
      ** Not annualized.
(double  
 dagger) Annualized.
     (1) For the period December 1, 1994 (commencement of sale of Navigator
         Shares) to December 31, 1994.
     (2) Net of fees waived and reimbursements made by the manager for expenses
         in excess of voluntary expense limitations as follows: 1.0% until
         September 10, 1989; 0.5% until March 31, 1990; 0.6% until December 31,
         1990; 0.75% until April 30, 1991; 0.8% until December 31, 1991; 0.85%
         until August 31, 1992; and 0.95% until October 31, 1995.
     (3) Net of fees waived and reimbursements made by the manager for expenses
         in excess of voluntary limitation as follows: 0.45% until October 31,
         1995.
     (4) Includes distribution fee of 0.5%
4
 
<PAGE>
     PERFORMANCE INFORMATION
    From time to time the Fund may quote the total return of each class of
shares in advertisements or in reports or other communications to shareholders.
A mutual fund's TOTAL RETURN is a measurement of the overall change in value,
including changes in share price and assuming reinvestment of dividends and
capital gain distributions of an investment in the fund. CUMULATIVE TOTAL RETURN
shows the fund's performance over a specific period of time. AVERAGE ANNUAL
TOTAL RETURN is the average annual compounded return that would have produced
the same cumulative total return if the fund's performance had been constant
over the entire period. Performance figures reflect past performance and are not
intended to indicate future performance. Average annual returns tend to smooth
out variations in the fund's return, so they differ from actual year-by-year
results.
    Total returns of Primary Shares as of December 31, 1994 were as follows:
<TABLE>
<CAPTION>
                               CUMULATIVE      AVERAGE ANNUAL
                              TOTAL RETURN      TOTAL RETURN
<S>                           <C>              <C>
One Year                             -1.93 %           -1.93%
Five Years                          +38.59             +6.75
Life of Fund (dagger)               +70.08             +7.43
</TABLE>
 
(dagger) Fund's inception -- August 7, 1987.
    No adjustment has been made for any income taxes payable by shareholders.
The investment return and principal value of an investment in the Fund will
fluctuate so that an investor's shares, when redeemed, may be worth more or less
than their original cost. Returns would have been lower if the Manager had not
waived/reimbursed certain fees and expenses during the fiscal years 1987 through
1994. As of the date of this Prospectus, Navigator Shares have no material
performance record.
    The Fund also may advertise its yield or effective yield. Yield reflects net
investment income per share (as defined by applicable SEC regulations) over a
30-day (or one-month) period, expressed as an annualized percentage of net asset
value at the end of the period. The effective yield, although calculated
similarly, will be slightly higher than the yield because it assumes that income
earned from the investment is reinvested (i.e., the compounding effect of
reinvestment). Yield computations differ from other accounting methods and
therefore may differ from dividends actually paid or reported net income.
    Further information about the Fund's performance is contained in the Annual
Report to Shareholders, which may be obtained without charge by calling your
Legg Mason or affiliated investment executive or Legg Mason's Funds Marketing
Department at 800-822-5544.
                                                                               5
 
<PAGE>
     THE FUND'S INVESTMENT OBJECTIVE AND POLICIES
          The investment objective of the Fund is to provide investors with high
      current income consistent with prudent investment risk and liquidity
      needs. The investment objective of the Fund may not be changed without a
      vote of Fund shareholders; however, except as otherwise noted, the
      investment policies of the Fund described below may be changed by the
      Corporation's Board of Directors without a shareholder vote. There can be
      no assurance that the Fund's investment objective will be achieved.
          At least 75% of the Fund's total assets are, under normal
      circumstances, invested in U.S. government securities or instruments
      secured by such securities, including repurchase agreements. The Fund
      expects to maintain an average dollar-weighted maturity of between three
      and ten years. U.S. government securities include: 1) U.S. Treasury
      obligations, which differ only in their interest rates, maturities and
      times of issuance: U.S. Treasury bills (maturity of one year or less),
      U.S. Treasury notes (maturity of one to ten years) and U.S. Treasury bonds
      (generally maturities of greater than ten years); and 2) obligations
      issued or guaranteed by U.S. government agencies and instrumentalities
      which are supported by any of the following: a) the full faith and credit
      of the U.S. Government (such as certificates of the Government National
      Mortgage Association, "GNMA", b) the right of the issuer to borrow an
      amount limited to a specific line of credit from the U.S. Government (such
      as obligations of the Federal Home Loan Banks), c) discretionary authority
      of the U.S. Treasury to lend to the government agency or instrumentality
      (such as the Federal National Mortgage Association), or d) only the credit
      of the instrumentality (such as the Student Loan Marketing Association).
      In the case of obligations not backed by the full faith and credit of the
      Untied States, the Fund must look principally to the agency or
      instrumentality issuing or guaranteeing the obligation for ultimate
      repayment and may not be able to assert a claim against the United States
      itself in the event the agency or instrumentality does not meet its
      commitments. The U.S. Government does not guarantee the market value of
      the Fund's investments or the market value or yield of the Fund's shares,
      which will fluctuate with changes in market interest rates. Investments in
      mortgage-related securities issued by governmental or government-related
      entities, as described on the next page, will be included in the 75%
      limitation.
          The balance of the Fund, up to 25% of its total assets, normally is
      invested in cash, commercial paper and investment grade debt securities
      rated within one of the four highest grades assigned by Standard & Poor's
      Ratings Group ("S&P") (AAA, AA, A or BBB), Moody's Investors Service, Inc.
      ("Moody's") (Aaa, Aa, A or Baa), securities comparably rated by another
      nationally recognized statistical rating organization, or unrated
      securities judged by the Adviser to be of comparable quality. Debt
      securities rated Baa are deemed by Moody's to have speculative
      characteristics; changes in economic conditions or other circumstances are
      more likely to lead to a weakened capacity for the issuers of such
      securities to make principal and interest payments than is the case for
      high-grade debt securities. A further description of Moody's and S&P's
      ratings is included in the Appendix to the Statement of Additional
      Information.
          The market value of the interest-bearing debt securities held by the
      Fund, and therefore the net asset value of Fund shares, is affected by
      changes in market interest rates. There is normally an inverse
      relationship between the market value of securities sensitive to
      prevailing interest rates and actual changes in interest rates; i.e., a
      decline in interest rates produces an increase in market value, while an
      increase in rates produces a decrease in market value. Moreover, the
      longer the remaining maturity of a security, the greater is the effect of
      interest rate changes on the market value of such a security. In addition,
      changes in the ability of an issuer to make payments of interest and
      principal and in the market's perception of an issuer's creditworthiness
      also affect the market value of the debt securities of that issuer.
          Certain of the mortgage-backed and other securities in which the Fund
      can invest pay interest at variable or floating rates. Variable rate
      instruments reset at specified intervals, while floating rate instruments
      reset whenever there is a change in a specified index rate. The more
      closely these changes reflect current market rates, the more likely the
      instrument will trade at a price close to its par value.
6
 
<PAGE>
      Some instruments do not directly track the underlying index, but reset
      based on formulas that can produce an effect similar to leverage; others
      may provide for interest payments that vary inversely with market rates;
      these instruments are regarded as "derivatives," and may vary
      significantly in market price when interest rates change.
          The Fund has adopted certain fundamental investment limitations that,
      like its investment objective, may not be changed without the approval of
      the Fund's shareholders. A full description of these investment
      limitations is included in the Statement of Additional Information.
      Corporate Debt Securities
          Among the debt securities in which the Fund may invest are those
      issued by corporations. In selecting corporate debt securities for the
      Fund, the Adviser reviews and monitors the creditworthiness of each issuer
      and issue. Interest rate trends and specific developments which the
      Adviser believes may affect individual issuers are also analyzed.
      Mortgage-Related Securities
          The Fund normally may invest up to 50% of its total assets in
      mortgage-related securities, including those issued by the governmental or
      government-related entities referred to above. Mortgage-related securities
      represent interests in pools of mortgages created by lenders such as
      commercial banks, savings and loan institutions, mortgage bankers and
      others. Mortgage-related securities may be issued by governmental or
      government-related entities or by non-governmental entities such as banks,
      savings and loan institutions, private mortgage insurance companies,
      mortgage bankers and other secondary market issuers. No more than 25% of
      the Fund's total assets normally are invested in mortgage-related
      securities issued by non-governmental entities.
          Interests in pools of mortgage-related securities differ from other
      forms of debt securities which normally provide for periodic payment of
      interest in fixed amounts with principal payments at maturity or specified
      call dates. In contrast, mortgage-related securities provide monthly
      payments which consist of interest and, in most cases, principal. In
      effect, these payments are a "pass-through" of the monthly payments made
      by the individual borrowers on their residential mortgage loans, net of
      any fees paid to the issuer or guarantor of such securities. Additional
      payments to holders of mortgage-related securities are caused by
      repayments resulting from the sale of the underlying residential property,
      refinancing or foreclosure, net of fees or costs which may be incurred.
      Some mortgage-related securities are described as "modified pass-through."
      These securities entitle the holders to receive all interest and principal
      payments owed on the mortgages in the pool, net of certain fees,
      regardless of whether or not the mortgagors actually make the payments.
          The Adviser expects that governmental or private entities may create
      new types of mortgage-related securities in response to changes in the
      market or changes in government regulation of such securities. As new
      types of mortgage-related securities are developed and offered to
      investors, the Adviser will, consistent with the investment objective and
      policies of the Fund, consider making investments in such new types of
      securities.
          As prepayment rates of individual pools of mortgage loans vary widely,
      it is not possible to predict accurately the average life of a particular
      mortgage-related security. Although both government and privately-issued
      mortgage-related securities are issued with stated maturities of up to
      forty years, unscheduled or early payments of principal and interest on
      the underlying mortgages may shorten considerably the securities'
      effective maturities. On the other hand, a decrease in the rate of
      prepayments may extend the effective maturities of mortgage-related
      securities, increasing their sensitivity to changes in market interest
      rates. Such a decrease in prepayments may result from an increase in
      market interest rates, among other causes. The volume of prepayments of
      principal on a pool of mortgages underlying a particular mortgage-related
      security will influence the yield of that security, and the principal
      returned to the Fund may be reinvested in instruments whose yield may be
      higher or lower than that which might have been obtained had such
      prepayments not occurred. When interest rates are declining, such
      prepayments usually increase, with the result that reinvestment of such
      principal prepayments will be at a lower rate than that on the original
      mortgage-related security. Increased prepayment of principal may limit the
      Fund's ability to realize the appreciation in the value of such securities
      that would otherwise accompany declining interest
                                                                               7
 
<PAGE>
      rates. An increase in mortgage prepayments could cause the Fund to incur a
      loss on a mortgage-related security that was purchased at a premium. In
      determining the Fund's average maturity, the Adviser must apply certain
      assumptions and projections about the maturity and prepayments of
      mortgage-related securities; actual prepayment rates may differ.
      Government Mortgage-Related Securities
          GNMA is the principal federal government guarantor of mortgage-related
      securities. GNMA is a wholly owned U.S. government corporation within the
      Department of Housing and Urban Development. GNMA pass-through securities
      are considered to have a very low risk of default in that (i) the
      underlying mortgage loan portfolio is comprised entirely of
      government-backed loans and (ii) the timely payment of both principal and
      interest on the securities is guaranteed by the full faith and credit of
      the U.S. Government -- regardless of whether they have been collected.
      GNMA pass-through securities are, however, subject to the same market risk
      as comparable debt securities. Therefore, the effective maturity and
      market value of the Fund's GNMA securities can be expected to fluctuate in
      response to changes in interest rate levels.
          Residential mortgage loans are also pooled by the Federal Home Loan
      Mortgage Corporation ("FHLMC"). FHLMC is a corporate instrumentality of
      the U.S. Government that was created by Congress in 1970 for the purposes
      of increasing the availability of mortgage credit for residential housing.
      FHLMC issues mortgage participation certificates ("PCs") which represent
      interests in mortgages from FHLMC's national portfolio. The mortgage loans
      in FHLMC's portfolio are not government backed; rather, the loans are
      either uninsured with loan-to-value ratios of 80% or less, or privately
      insured if the loan-to-value ratio exceeds 80%. FHLMC, not the U.S.
      Government, guarantees the timely payment of interest and ultimate
      collection of principal on FHLMC PCs.
          The Federal National Mortgage Association ("FNMA") is a
      government-sponsored corporation owned entirely by private stockholders.
      It is subject to general regulation by the Secretary of Housing and Urban
      Development. FNMA purchases residential mortgages from a list of approved
      seller/servicers, which include savings and loan associations, savings
      banks, commercial banks, credit unions and mortgage bankers. Pass-through
      certificates ("FNMA certificates") issued by FNMA are guaranteed as to
      timely payment of principal and interest by FNMA, not the U.S. Government.
      Privately Issued Mortgage-Related Securities
          Mortgage-related securities offered by private issuers include
      pass-through securities comprised of pools of conventional residential
      mortgage loans; mortgage-backed bonds which are considered to be
      obligations of the institution issuing the bonds and are collateralized by
      mortgage loans; and bonds and collateralized mortgage obligations ("CMOs")
      which are collateralized by mortgage-related securities issued by FHLMC,
      FNMA, or GNMA or by pools of conventional mortgages.
          CMOs are typically structured with two or more classes or series which
      have different maturities and are generally retired in sequence. Each
      class of obligations is scheduled to receive periodic interest payments
      according to the coupon rate on the obligations. However, all monthly
      principal payments and any repayments from the collateral pool are paid
      first to the "Class 1" bondholders. The principal payments are such that
      the Class 1 obligations are scheduled to be completely repaid no later
      than, for example, five years after the offering date. Thereafter, all
      payments of principal are allocated to the next most senior class of bonds
      until that class of bonds has been fully repaid. Although full payoff of
      each class of bonds is contractually required by a certain date, any or
      all classes of obligations may be paid off sooner than expected because of
      an increase in the payoff speed of the pool.
          Mortgage-related securities created by non-governmental issuers
      generally offer a higher rate of interest than government and government-
      related securities because there are no direct or indirect government
      guarantees of payments in the former securities, resulting in higher
      risks. However, many issuers or servicers of mortgage-related securities
      guarantee timely payment of interest and principal on such securities.
      Timely payment of principal may also be supported by various forms of
      insurance, including individual loan, title, pool and hazard policies.
      There can be no assurance that the private issuers or insurers will be
      able to meet their obligations under the relevant guarantees and insurance
      policies, and such guarantees
8
 
<PAGE>
      and policies often do not cover the full amount of the pool. Where
      privately issued securities are collateralized by securities issued by
      FHLMC, FNMA or GNMA, the timely payment of interest and principal is
      supported by the government-related securities collateralizing such
      obligations.
          Since the inception of the mortgage-related pass-through security in
      1970, the market for these securities has expanded considerably. The size
      of the primary issuance market and active participation in the secondary
      market by securities dealers and many types of investors make government
      and government-related pass-through pools highly liquid. Private
      conventional pools of mortgages (pooled by commercial banks, savings and
      loan institutions and others with no relationship to government and
      government-related entities) have also achieved broad market acceptance,
      and consequently an active secondary market has emerged. However, the
      market for conventional pools is smaller and less liquid than the market
      for the government and government-related mortgage pools.
          The Fund may purchase some mortgage-related securities through private
      placements. In such cases, the securities may be considered illiquid and,
      if so, will be subject to the Fund's investment limitation that no more
      than 10% of its net assets will be invested in illiquid securities.
      Asset-Backed Securities
          Asset-backed securities are securities that represented direct or
      indirect participations in, or are secured by and payable from, assets
      such as motor vehicle installment sales contracts, installment loan
      contracts, leases of various types of real and personal property and
      receivables from revolving credit (credit card) agreements. Such assets
      are securitized through the use of trusts and special purpose
      corporations. The value of such securities partly depends on loan
      repayments by individuals, which may be adversely affected during general
      downturns in the economy. Payments or distributions of principal and
      interest on asset-backed securities may be supported by credit
      enhancements, such as various forms of cash collateral accounts or letters
      of credit. Like mortgage-related securities, asset-backed securities are
      subject to the risk of prepayment. The risk that recovery on repossessed
      collateral might be unavailable or inadequate to support payments on
      asset-backed securities, however, is greater than is the case for
      mortgage-backed securities.
      Zero Coupon Bonds
          Zero coupon bonds are debt obligations which make no fixed interest
      payments but instead are issued at a significant discount from face value.
      Like other debt securities, the price can also reflect a premium or
      discount to the original issue discount reflecting the market's judgment
      as to the issuer's creditworthiness, the interest rate or other similar
      factors. The discount approximates the total amount of interest the bonds
      will accrue and compound over the period until maturity or the first
      interest payment date at a rate of interest reflecting the market rate of
      the security at the time of issuance. Because zero coupon bonds do not
      require the periodic payment of interest, their prices can be very
      volatile when market interest rates change.
          The original issue discount on zero coupon bonds must be included in
      the Fund's income ratably as it accrues. Accordingly, to continue to
      qualify for tax treatment as a regulated investment company and to avoid a
      certain excise tax, the Fund may be required to distribute as a dividend
      an amount that is greater than the total amount of cash it actually
      receives. See "Additional Tax Information" in the Statement of Additional
      Information. These distributions must be made from the Fund's cash assets
      or, if necessary, from the proceeds of sales of portfolio securities. Such
      sales could occur at a time which would be disadvantageous to the Fund and
      when the Fund would not otherwise choose to dispose of the assets.
      Convertible Securities
          A convertible security is a bond, debenture, note, preferred stock or
      other security that may be converted into or exchanged for a prescribed
      amount of common stock of the same or a different issuer within a
      particular period of time at a specified price or formula. A convertible
      security entitles the holder to receive interest paid or accrued on debt
      or the dividend paid on preferred stock until the convertible security
      matures or is redeemed, converted or exchanged. Before conversion,
      convertible securities ordinarily provide a stable stream of income with
      generally higher yields than those of common stocks of the same or similar
      issuers, but lower than the yield on non-convertible debt. Convertible
      securities are usually
                                                                               9
 
<PAGE>
      subordinated to comparable-tier non-convertible securities but rank senior
      to common stock in a corporation's capital structure.
          The value of a convertible security is a function of (1) its yield in
      comparison with the yields of other securities of comparable maturity and
      quality that do not have a conversion privilege and (2) its worth, at
      market value, if converted into the underlying common stock. Convertible
      securities are typically issued by smaller capitalized companies, whose
      stock prices may be volatile. The price of a convertible security often
      reflects such variations in the price of the underlying common stock in a
      way that non-convertible debt does not. A convertible security may be
      subject to redemption at the option of the issuer at a price established
      in the convertible security's governing instrument, which could have an
      adverse effect on the Fund's ability to achieve its investment objective.
      The Fund does not intend to exercise conversion rights for any convertible
      security it owns and does not intend to hold any security which has been
      subject to conversion.
      Foreign Securities
          The Fund may invest in U.S. dollar-denominated debt securities issued
      by foreign companies and governments. The foreign government securities in
      which the Fund invests generally consist of obligations supported by
      national, state or provincial governments or similar political
      subdivisions. The Fund also may invest in debt securities of foreign
      "quasi-government agencies," which are issued by entities owned by a
      national, state or equivalent government or are obligations of a political
      unit that is not backed by the national government's full faith and credit
      and general taxing powers.
          Investment in foreign securities presents certain risks, including
      those resulting from adverse political and economic developments, reduced
      availability of public information concerning issuers and the fact that
      foreign issuers generally are not subject to uniform accounting, auditing
      and financial reporting standards or to other regulatory practices and
      requirements comparable to those applicable to domestic issuers. Moreover,
      securities of many foreign issuers may be less liquid and their prices
      more volatile than those of comparable domestic issuers. Some foreign
      securities are subject to foreign taxes and withholding. Because the
      foreign securities in which the Fund invests are U.S. dollar-denominated,
      there is no risk of currency fluctuation.
      Repurchase Agreements
          A repurchase agreement is an agreement under which the Fund acquires
      U.S. government obligations from a securities dealer or bank subject to
      resale at an agreed-upon price and date. The securities are held for the
      Fund by State Street Bank and Trust Company ("State Street"), the Fund's
      custodian, as collateral until resold and will be supplemented by
      additional collateral if necessary to maintain a total value equal to or
      in excess of the value of the repurchase agreement. The Fund bears a risk
      of loss in the event that the other party to a repurchase agreement
      defaults on its obligations and the Fund is delayed or prevented from
      exercising its right to dispose of the collateral securities, which may
      decline in value in the interim. The Fund will enter into repurchase
      agreements only with financial institutions which the Adviser believes
      present minimal risk of default during the term of the agreement based on
      guidelines established by the Corporation's Board of Directors. The Fund
      will not enter into repurchase agreements of more than seven days'
      duration if more than 10% of its total assets would be invested in such
      agreements and other illiquid investments.
      When-Issued Securities
          The Fund may enter into commitments to purchase U.S. government
      securities or other securities on a when-issued basis. The Fund may
      purchase when-issued securities because such securities are often the more
      efficiently priced and have the best liquidity in the bond market. As with
      the purchase of all securities, when the Fund purchases securities on a
      when-issued basis, it assumes the risks of ownership, including the risk
      of price fluctuation, at the time of purchase, not at the time of receipt.
      However, the Fund does not have to pay for the obligations until they are
      delivered to the Fund, which is normally 7 to 15 days later, but could be
      considerably longer in the case of some mortgage-backed securities. To
      meet that payment obligation, the Fund will set aside cash or liquid high-
      quality debt securities equal to the payment that will be due. Depending
      on market conditions, the Fund's when-issued purchases could cause its net
10
 
<PAGE>
      asset value to be more volatile, because they will increase the amount by
      which the Fund's total assets, including the value of the when-issued
      securities held by the Fund, exceed its net assets. The Fund does not
      expect that its commitment to purchase when-issued securities will at any
      time exceed, in the aggregate, 20% of its total assets.
      Futures and Option Transactions
          In an effort to protect against the effect of adverse changes in
      interest rates, the Fund may purchase and sell interest rate futures
      contracts and may purchase put options on interest rate futures contracts
      and debt securities (practices known at "hedging"). A futures contract is
      an agreement by the Fund to buy or sell securities at a specified date and
      price. The purchase of a put option on a futures contract allows the Fund,
      at its option, to enter into a particular futures contract or sell
      securities at any time up to the option's expiration date.
          The Fund may purchase put options on interest rate futures contracts
      or sell interest rate futures contracts (that is, enter into a futures
      contract to sell the underlying security) to attempt to reduce the risk of
      fluctuations in its share value. The Fund may purchase an interest rate
      futures contract (that is, enter into a futures contract to purchase the
      underlying security) to attempt to establish more definitely the return on
      securities the Fund intends to purchase. The Fund may not use these
      instruments for speculation or leverage.
          The Fund may seek to enhance its income or hedge the portfolio by
      writing (selling) covered call options (i.e., the Fund will own the
      underlying instrument while the call is outstanding) and covered put
      options (i.e., the Fund will have cash, U.S. government securities or
      other high-grade, liquid debt instruments in a segregated account in an
      amount not less than the exercise price while the put is outstanding).
          The Fund may write call options on securities in its portfolio in an
      attempt to realize, through the premium the Fund receives, a greater
      current return than would be realized on the securities alone. The Fund
      may write put options in an attempt to realize enhanced income when it is
      willing to purchase the underlying instrument for its portfolio at the
      exercise price. The Fund may also purchase call options for the purpose of
      acquiring the underlying instruments for its portfolio. At times, the net
      cost of acquiring instruments in this manner (the exercise price of the
      call option plus the premium paid) may be less than the cost of acquiring
      the instruments directly.
          The success of the Fund's hedging activities in reducing risks depends
      on many factors, the most significant of which is the Adviser's ability to
      predict market interest rate changes correctly. Generally speaking,
      selling futures contracts, purchasing put options and writing call options
      are strategies designed to protect against falling security prices, and
      can limit potential gains if prices rise. Purchasing futures contracts,
      purchasing call options and writing put options are strategies whose
      return tend to rise and fall together with security prices, and can cause
      losses if prices fall. If security prices remain unchanged over time,
      option writing strategies tend to be profitable, while option buying
      strategies tend to decline in value. However, there may not be perfect
      correlation between movements in the price of an option or futures
      contract and movements in the price of the underlying security.
          The Fund could also be exposed to risks if it could not close out its
      futures or options positions because of an illiquid secondary market. The
      Adviser attempts to minimize the possible negative effects of these
      factors through careful selection and monitoring of the Fund's futures and
      options positions. The Adviser is of the opinion that the Fund's
      investments in futures transactions will not have a material adverse
      effect on the Fund's liquidity or ability to honor redemptions.
          The purchase and sale of options and futures contracts involve risks
      different from those involved with direct investments in securities, and
      also require different skills by the Adviser in managing the Fund's
      portfolio. While utilization of options, futures contracts and similar
      instruments may be advantageous to the Fund, if the Adviser is not
      successful in employing such instruments in managing the Fund's
      investments or in predicting interest rate changes, the Fund's performance
      will be worse than if the Fund had not made such investments. In addition,
      the Fund will pay commissions and other costs in connection with such
      investments, which may increase the Fund's expenses and reduce its yield.
      A more complete
                                                                              11
 
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      discussion of the possible risks involved in transactions in options and
      futures contracts is contained in the Statement of Additional Information.
      The Fund's current policy is to limit options and futures transactions to
      those described above.
          The Fund will not enter into any futures contracts or related options
      if the sum of the initial margin deposits on futures contracts and related
      options and premiums paid for related options the Fund has purchased would
      exceed 5% of the Fund's total assets. The Fund will not purchase futures
      contracts or related options if, as a result, more than 33 1/3% of the
      Fund's total assets would be so invested.
      Portfolio Turnover
          For the year ended December 31, 1994, the Fund's portfolio turnover
      rate was 315.7% and the Fund anticipates that in the future its portfolio
      turnover rate may exceed 300%. The portfolio turnover rate is computed by
      dividing the lesser of purchases or sales of securities for the period by
      the average value of portfolio securities for that period. Short-term
      securities are excluded from the calculation. A portfolio turnover rate in
      excess of 100% will involve correspondingly greater transaction costs
      which will be borne directly by the Fund. It may also increase the amount
      of short-term capital gains, if any, realized by the Fund and will affect
      the tax treatment of distributions paid to shareholders because
      distributions of net short-term capital gains are taxable as ordinary
      income.
HOW YOU CAN INVEST IN THE FUND
          You may purchase Primary Shares of the Fund through a brokerage
      account with Legg Mason or with an affiliate that has a dealer agreement
      with Legg Mason (Legg Mason is a wholly owned subsidiary of Legg Mason,
      Inc., a financial services holding company). Your Legg Mason or affiliated
      investment executive will be pleased to explain the shareholder services
      available from the Fund and answer any questions you may have. Documents
      available from your Legg Mason or affiliated investment executive should
      be completed if you invest in shares of the Fund through an Individual
      Retirement Account ("IRA"), Self-Employed Individual Retirement Plan
      ("Keogh Plan"), Simplified Employee Pension Plan ("SEP") or other
      qualified retirement plan.
          The minimum initial investment in Primary Shares for each account,
      including investments made by exchange from other Legg Mason funds, is
      $1,000, and the minimum investment for each purchase of additional shares
      is $100, except as noted below. Initial investments in an IRA account
      established on behalf of a nonworking spouse of a shareholder who has an
      IRA invested in the Fund require a minimum amount of only $250. Subsequent
      investments in an IRA or similar plan also require a minimum amount of
      $100. However, once an account is established, the minimum amount for
      subsequent investments will be waived if an investment in an IRA or
      similar plan will bring the investment for the year to the maximum amount
      permitted under the Internal Revenue Code of 1986, as amended ("Code").
      For purchases of shares through payroll deduction plans, the Fund's Future
      First Systematic Investment Plan and plans involving automatic payment of
      funds from financial institutions or automatic investment of dividends
      from certain unit investment trusts, minimum initial and subsequent
      investments are lower. The Fund may change these minimum amount
      requirements at its discretion. You should always furnish your shareholder
      account number when making additional purchases of Fund shares.
          There are three ways you can invest in Primary Shares of the Fund:
1. THROUGH YOUR LEGG MASON OR AFFILIATED INVESTMENT EXECUTIVE
          Shares may be purchased through any Legg Mason or affiliated
      investment executive. An investment executive will be pleased to open an
      account for you, explain to you the shareholder services available from
      the Fund, and answer any questions you may have. After you have
      established a Legg Mason or affiliated account, you can order shares from
      your investment executive in person, by telephone or by mail.
2. THROUGH THE FUTURE FIRST SYSTEMATIC INVESTMENT PLAN
          You may also buy shares through the Future First Systematic Investment
      Plan. Under this plan, you may arrange for automatic monthly investments
      in the Fund of $50 or more by authorizing Boston Financial Data Services
      ("BFDS"), the Fund's transfer agent, to prepare a check each month drawn
      on your checking account. There is no minimum initial investment. Please
      contact any
12
 
<PAGE>
      Legg Mason or affiliated investment executive for further information.
3. THROUGH AUTOMATIC INVESTMENTS
          Arrangements may be made with some employers and financial
      institutions, such as banks or credit unions, for regular automatic
      monthly investments of $50 or more in shares. In addition, it may be
      possible for dividends from certain unit investment trusts to be invested
      automatically in shares. Persons interested in establishing such automatic
      investment programs should contact the Fund through any Legg Mason or
      affiliated investment executive.
          Primary Shares purchased on behalf of an IRA, Keogh Plan, SEP or other
      qualified retirement plan will be processed at the net asset value next
      determined after Legg Mason's Funds Processing receives a check for the
      amount of the purchase. Other Primary Share purchases will be processed at
      the net asset value next determined after your Legg Mason or affiliated
      investment executive has received your order; payment must be made within
      five business days to Legg Mason. Beginning in June, 1995, payment must be
      made within three business days to Legg Mason. Orders received by your
      Legg Mason or affiliated investment executive before the close of business
      of the New York Stock Exchange, Inc. ("Exchange") (normally 4:00 p.m.
      Eastern time) ("close of the Exchange") on any day the Exchange is open
      will be executed at the net asset value determined as of the close of the
      Exchange on that day. Orders received by your Legg Mason or affiliated
      investment executive after the close of the Exchange or on days the
      Exchange is closed will be executed at the net asset value determined as
      of the close of the Exchange on the next day the Exchange is open. See
      "How Net Asset Value is Determined" on page 14. The Fund reserves the
      right to reject any order for shares of the Fund or to suspend the
      offering of shares for a period of time.
HOW YOUR SHAREHOLDER ACCOUNT IS MAINTAINED
          When you initially purchase shares, a shareholder account is
      automatically established for you. Any shares that you purchase or receive
      as a distribution will be credited directly to your account at the time of
      purchase or receipt. No certificates are issued unless you specifically
      request them in writing. Shareholders who elect to receive certificates
      can redeem their shares only by mail. Certificates will be issued in full
      shares only. No certificates will be issued for shares prior to 15
      business days after purchase of such shares by check unless the Fund can
      be reasonably assured during that period that payment for the purchase of
      such shares has been collected. Shares may not be held in, or transferred
      to, an account with any brokerage firm other than Legg Mason or its
      affiliates.
HOW YOU CAN REDEEM YOUR PRIMARY SHARES
          There are two ways you can redeem your Primary Shares. First, you may
      give your Legg Mason or affiliated investment executive an order for
      repurchase of your shares. Please have the following information ready
      when you call: the number of shares to be redeemed and your shareholder
      account number. Second, you may send a written request for redemption to
      "Legg Mason U.S. Government Intermediate-Term Portfolio, c/o Legg Mason
      Funds Processing, P.O. Box 1476, Baltimore, Maryland 21203-1476."
          Requests for redemption in "good order," as described below, received
      by your Legg Mason or affiliated investment executive before the close of
      the Exchange on any day when the Exchange is open, will be transmitted to
      BFDS, transfer agent for the Fund, for redemption at the net asset value
      per share determined as of the close of the Exchange on that day. Requests
      for redemption received by your Legg Mason or affiliated investment
      executive after the close of the Exchange will be executed at the net
      asset value determined as of the close of the Exchange on its next trading
      day. A redemption request received by your Legg Mason or affiliated
      investment executive may be treated as a request for repurchase and, if it
      is accepted by Legg Mason, the shares will be purchased at the net asset
      value per share determined as of the next close of the Exchange.
          Proceeds from your redemption will settle in your Legg Mason brokerage
      account two business days after trade date. However, the Fund reserves the
      right to take up to seven days to make payment upon redemption if, in the
      judgment of the Adviser, the Fund could be adversely affected by immediate
      payment. (The Statement of Additional Information describes several other
      circumstances
                                                                              13
 
<PAGE>
      in which the date of payment may be postponed or the right of redemption
      suspended.) The proceeds of your redemption or repurchase may be more or
      less than your original cost. If the shares to be redeemed or repurchased
      were paid for by check (including certified or cashier's checks) within 15
      business days of the redemption or repurchase request, the proceeds may
      not be disbursed unless the Fund can be reasonably assured that the check
      has been collected.
          A redemption request will be considered to be received in "good order"
      only if:
          1. You have indicated in writing the number of Primary Shares to be
      redeemed and your shareholder account number;
          2. The written request is signed by you and by any co-owner of the
      account with exactly the same name or names used in establishing the
      account;
          3. The written request is accompanied by any certificates representing
      the shares that have been issued to you, and you have endorsed the
      certificates for transfer or an accompanying stock power exactly as the
      name or names appear on the certificates; and
          4. The signatures on the written redemption request and on any
      certificates for your shares (or an accompanying stock power) have been
      guaranteed without qualification by a national bank, a state bank, a
      member firm of a principal stock exchange or other entity described in
      Rule 17Ad-15 under the Securities Exchange Act of 1934.
          Other supporting legal documents may be required from corporations or
      other organizations, fiduciaries or persons other than the shareholder of
      record making the request for redemption or repurchase. If you have a
      question concerning the redemption of shares, contact your Legg Mason or
      affiliated investment executive.
          The Fund will not be responsible for the authenticity of redemption
      instructions received by telephone, provided it follows reasonable
      procedures to identify the caller. The Fund may request identifying
      information from callers or employ identification numbers. The Fund may be
      liable for losses due to unauthorized or fraudulent instructions if it
      does not follow reasonable procedures. Telephone redemption privileges are
      available automatically to all shareholders unless certificates have been
      issued. Shareholders who do not wish to have telephone redemption
      privileges should call their Legg Mason or affiliated investment executive
      for further instructions.
          To redeem your Fund retirement account, a Distribution Request Form
      must be completed and returned to Legg Mason Client Services for
      processing. This form can be obtained through your Legg Mason or
      affiliated investment executive or Legg Mason Client Services in
      Baltimore, Maryland.
          Because of the relatively high cost of maintaining small accounts, the
      Fund may elect to close any account with a current value of less than $500
      by redeeming all of the shares in the account and mailing the proceeds to
      you. However, the Fund will not redeem accounts that fall below $500
      solely as a result of a reduction in net asset value per share. If the
      Fund elects to redeem the shares in your account, you will be notified
      that your account is below $500 and will be allowed 60 days in which to
      make an additional investment in order to avoid having your account
      closed.
HOW NET ASSET VALUE IS DETERMINED
          Net asset value per share is determined daily, as of the close of the
      Exchange, on every day that the Exchange is open, by subtracting the
      liabilities attributable to Primary Shares from the total assets
      attributable to such shares and dividing the result by the number of
      Primary Shares outstanding. Securities owned by the Fund for which market
      quotations are readily available are valued at current market value. In
      the absence of readily available market quotations, securities are valued
      at fair value as determined by the Corporation's Board of Directors.
DIVIDENDS AND OTHER DISTRIBUTIONS
          The Fund declares dividends to holders of Primary Shares out of its
      investment company taxable income attributable to those shares, which
      consists of net investment income and net short-term capital gain.
      Dividends from net investment income are declared daily and paid monthly.
      Shareholders begin to earn dividends on their Fund shares as of settlement
      date, which is normally the fifth business day after their orders are
      placed with their Legg Mason or affiliated investment executive. Beginning
      in June, 1995, settlement date will normally be the third business day
      after orders are
14
 
<PAGE>
      placed with a Legg Mason or affiliated investment executive. Dividends
      from net short-term capital gain and distributions of substantially all
      net capital gain (the excess of net long-term capital gain over net
      short-term capital loss) generally are declared and paid after the end of
      the taxable year in which the gain is realized. A second distribution of
      net capital gain may be necessary in some years to avoid imposition of the
      excise tax described under the heading "Additional Tax Information" in the
      Statement of Additional Information. Dividends and capital gain
      distributions, if any, on shares held in an IRA, Keogh Plan, SEP or other
      qualified retirement plan and by shareholders maintaining a Systematic
      Withdrawal Plan generally are reinvested in Primary Shares on the payment
      dates. Other shareholders may elect to:
          1. Receive both dividends and capital gain distributions in Primary
      Shares;
          2. Receive dividends in cash and capital gain distributions in Primary
      Shares;
          3. Receive dividends in Primary Shares and capital gain distributions
      in cash; or
          4. Receive both dividends and capital gain distributions in cash.
          In certain cases, you may reinvest your dividends and capital gain
      distributions in Primary Shares of another Legg Mason fund. Please contact
      your Legg Mason or affiliated investment executive for additional
      information about this option.
          If no election is made, both dividends and capital gain distributions
      will be credited to your account in Primary Shares at the net asset value
      of the shares determined as of the close of the Exchange on the
      reinvestment date. Shares received pursuant to any of the first three
      (reinvestment) elections above also will be credited to your account at
      that net asset value. If you elect to receive dividends and/or capital
      gain distributions in cash, you will be sent a check or will have your
      Legg Mason account credited after the payment date. You may elect at any
      time to change your option by notifying the Fund in writing at: Legg Mason
      U.S. Government Intermediate-Term Portfolio, c/o Legg Mason Funds
      Processing, P.O. Box 1476, Baltimore, Maryland 21203-1476. Your election
      must be received at least 10 days before the record date in order to be
      effective for dividends and capital gain distributions paid to
      shareholders as of that date.
TAX TREATMENT OF DIVIDENDS AND OTHER DISTRIBUTIONS
          The Fund intends to continue to qualify for treatment as a regulated
      investment company under the Code so that it will be relieved of federal
      income tax on that part of its investment company taxable income and net
      capital gain that is distributed to its shareholders.
          Dividends from the Fund's investment company taxable income (whether
      paid in cash or reinvested in Primary Shares) are taxable to its
      shareholders (other than IRAs, Keogh Plans, SEPs, other qualified
      retirement plans and other tax-exempt investors) as ordinary income to the
      extent of the Fund's earnings and profits. Distributions of the Fund's net
      capital gain (whether paid in cash or reinvested in Primary Shares), when
      designated as such, are taxable to those shareholders as long-term capital
      gain, regardless of how long they have held their Fund shares.
          The Fund sends each shareholder a notice following the end of each
      calendar year specifying, among other things, the amounts of all dividends
      and capital gain distributions paid (or deemed paid) during that year. The
      Fund is required to withhold 31% of all dividends, capital gain
      distributions and redemption proceeds payable to any individuals and
      certain other noncorporate shareholders who do not provide the Fund with a
      certified taxpayer identification number. The Fund also is required to
      withhold 31% of all dividends and capital gain distributions payable to
      such shareholders who otherwise are subject to backup withholding.
          A redemption of Fund shares may result in taxable gain or loss to the
      redeeming shareholder, depending on whether the redemption proceeds are
      more or less than the shareholder's adjusted basis for the redeemed
      shares. An exchange of Fund shares for shares of another Legg Mason fund
      generally will have similiar tax consequences. If Fund shares are
      purchased within 30 days before or after redeeming other Fund shares
      (regardless of class) at a loss, all or part of that loss will not be
      deductible and instead will increase the basis of the newly purchased
      shares.
          A dividend or capital gain distribution paid shortly after shares have
      been purchased, although in effect a return of investment, is subject to
      federal income tax. Accordingly, an investor should recognize that a
      purchase of Fund shares immediately prior to the record date for a
      dividend or
                                                                              15
 
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      capital gain distribution could cause the investor to incur tax
      liabilities and should not be made solely for the purpose of receiving the
      dividend or capital gain distribution.
          The foregoing is only a summary of some of the important federal tax
      considerations generally affecting the Fund and its shareholders; see the
      Statement of Additional Information for a further discussion. In addition
      to federal income tax, you may also be subject to state and local income
      taxes on distributions from the Fund, depending on the laws of your home
      state and locality, though the portion of the dividends paid by the Fund
      attributable to direct U.S. government obligations is not subject to state
      and local income taxes in most jurisdictions. The Fund's annual notice to
      shareholders regarding the amount of dividends identifies this portion.
      Prospective shareholders are urged to consult their tax advisers with
      respect to the effects of this investment on their own tax situations.
SHAREHOLDER SERVICES
CONFIRMATIONS AND REPORTS
          You will receive from the distributor a confirmation after each
      transaction (except a reinvestment of dividends, capital gains and shares
      purchased through the Future First Systematic Investment Plan or through
      automatic investments). An account statement will be sent to you monthly
      unless there has been no activity in the account or you are purchasing
      shares through the Future First Systematic Investment Plan or through
      automatic investments, in which case an account statement will be sent
      quarterly. Reports will be sent to shareholders at least semiannually
      showing the Fund's portfolio and other information; the annual report will
      contain financial statements audited by the Corporation's independent
      accountants.
          Shareholder inquiries should be addressed to "Legg Mason U.S.
      Government Intermediate-Term Portfolio, c/o Legg Mason Funds Processing,
      P.O. Box 1476, Baltimore, Maryland 21203-1476."
SYSTEMATIC WITHDRAWAL PLAN
          You may elect to make systematic withdrawals from your Fund account of
      a minimum of $50 on a monthly basis if you are purchasing or already own
      shares with a net asset value of $5,000 or more. Shareholders should not
      purchase shares of the Fund while they are participating in the Systematic
      Withdrawal Plan. Please contact your Legg Mason or affiliated investment
      executive for further information.
EXCHANGE PRIVILEGE
          As a Fund shareholder, you are entitled to exchange your Primary
      Shares of the Fund for Primary Shares of the following funds in the Legg
      Mason Family of Funds, provided that such shares are eligible for sale in
      your state of residence:
      Legg Mason Cash Reserve Trust
          A money market fund seeking stability of principal and current income
      consistent with stability of principal.
      Legg Mason Tax Exempt Trust, Inc.
          A money market fund seeking high current income exempt from federal
      income tax, preservation of capital, and liquidity.
      Legg Mason U.S. Government Money Market Portfolio
          A money market fund seeking high current income consistent with
      liquidity and conservation of principal.
      Legg Mason Value Trust, Inc.
          A mutual fund seeking long-term growth of capital.
      Legg Mason Special Investment Trust, Inc.
          A mutual fund seeking capital appreciation by investing principally in
      issuers with market capitalizations of less than $2.5 billion.
      Legg Mason Total Return Trust, Inc.
          A mutual fund seeking capital appreciation and current income in order
      to achieve an attractive total investment return consistent with
      reasonable risk.
      Legg Mason American Leading Companies Trust
          A mutual fund seeking long-term capital appreciation and current
      income consistent with prudent investment risk.
      Legg Mason Global Equity Trust
          A mutual fund seeking maximum long-term total return, by investing in
      common stocks of companies located in at least three different countries.
16
 
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      Legg Mason Investment Grade Income Portfolio
          A mutual fund seeking a high level of current income, primarily
      through investment in a diversified portfolio of investment grade debt
      securities.
      Legg Mason High Yield Portfolio
          A mutual fund primarily seeking a high level of current income and
      secondarily, capital appreciation, by investing principally in
      lower-rated, fixed-income securities.
      Legg Mason Global Government Trust
          A mutual fund seeking capital appreciation and current income by
      investing principally in debt securities issued or guaranteed by foreign
      governments, the U.S. Government, their agencies, instrumentalities and
      political subdivisions.
      Legg Mason Maryland Tax-Free Income Trust*
          A tax-exempt municipal bond fund seeking a high level of current
      income exempt from federal and Maryland state and local income taxes,
      consistent with prudent investment risk and preservation of capital.
      Legg Mason Pennsylvania Tax-Free Income Trust*
          A tax-exempt municipal bond fund seeking a high level of current
      income exempt from federal income tax and Pennsylvania personal income
      tax, consistent with prudent investment risk and preservation of capital.
      Legg Mason Tax-Free Intermediate-Term Income Trust*
          A tax-exempt municipal bond fund seeking a high level of current
      income exempt from federal income tax, consistent with prudent investment
      risk.
      * Shares of these funds are sold with an initial sales charge.
          Investments by exchange into the Legg Mason funds sold without an
      initial sales charge are made at the per share net asset value determined
      on the same business day as redemption of the Fund shares you wish to
      exchange. Investments by exchange into the Legg Mason funds sold with an
      initial sales charge are made at the per share net asset value, plus the
      applicable sales charge, determined on the same business day as redemption
      of the Fund shares you wish to redeem; except that no sales charge will be
      imposed upon proceeds from the redemption of Fund shares to be exchanged
      that were originally purchased by exchange from a fund on which the same
      or higher initial sales charge previously was paid. There is no charge for
      the exchange privilege, but the Fund reserves the right to terminate or
      limit the exchange privilege of any shareholder who makes more than four
      exchanges from the Fund in one calendar year. To obtain further
      information concerning the exchange privilege and prospectuses of other
      Legg Mason funds, or to make an exchange, please contact your Legg Mason
      or affiliated investment executive. To effect an exchange by telephone,
      please call your Legg Mason or affiliated investment executive with the
      information described in the section "How You Can Redeem Your Primary
      Shares," page 13. Please read the prospectus for the other funds carefully
      before you invest by exchange. The Fund reserves the right to modify or
      terminate the exchange privilege upon 60 days' notice to shareholders.
          There is no assurance the money market funds will be able to maintain
      a $1.00 share price. None of the funds is insured or guaranteed by the
      U.S. Government.
INVESTING THROUGH TAX-DEFERRED RETIREMENT PLANS
          An investment in shares of the Fund may be appropriate for IRAs, Keogh
      Plans, SEPs and other qualified retirement plans. Investors who are
      considering establishing such a plan may wish to consult their attorneys
      or other tax advisers with respect to individual tax questions. Your Legg
      Mason or affiliated investment executive can make available to you forms
      of plans. The option of investing in these plans through regular payroll
      deductions may be arranged with Legg Mason and your employer. Additional
      information with respect to these plans is available upon request from any
      Legg Mason or affiliated investment executive.
THE FUND'S BOARD OF DIRECTORS, MANAGER AND INVESTMENT ADVISER
BOARD OF DIRECTORS
          The business and affairs of the Fund are managed under the direction
      of the Corporation's Board of Directors.
MANAGER
          Pursuant to a management agreement with the Fund ("Management
      Agreement"), which was
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<PAGE>
      approved by the Corporation's Board of Directors, Legg Mason Fund Adviser,
      Inc., a wholly owned subsidiary of Legg Mason, Inc., serves as the Fund's
      manager. The Manager manages the non-investment affairs of the Fund,
      directs all matters related to the operation of the Fund and provides
      office space and administrative staff for the Fund. The Fund pays the
      Manager, pursuant to the Management Agreement, a management fee equal to
      an annual rate of 0.55% of the Fund's average daily net assets. The Fund's
      Manager has agreed that until October 31, 1995 or when the Fund reaches
      net assets (Primary Shares) of $400 million, whichever occurs first, it
      will continue to reimburse fees and/or assume other expenses to the extent
      the Fund's expenses (exclusive of taxes, interest, brokerage and
      extraordinary expenses) exceed during any month an annual rate of 0.95% of
      the Fund's average daily net assets (Primary Shares) for such month. After
      reimbursement by the Manager of certain expenses, the Fund's total
      operating expenses for the year ended December 31, 1994 were 0.90% of
      average daily net assets. Reimbursement by the Manager reduces Fund
      expenses and increases its yield and total return.
          The Manager acts as investment adviser, manager or consultant to
      fifteen investment company portfolios (excluding the Fund) which had
      aggregate assets under management of over $3.8 billion as of February 28,
      1995. The Manager's address is 111 South Calvert Street, Baltimore,
      Maryland 21202.
INVESTMENT ADVISER
          Western Asset Management Company, another wholly owned subsidiary of
      Legg Mason, Inc., serves as investment adviser to the Fund pursuant to the
      terms of an Investment Advisory Agreement with the Manager, which was
      approved by the Corporation's Board of Directors. The Adviser manages the
      investment and other affairs of the Fund and directs the investments of
      the Fund in accordance with its investment objective, policies and
      limitations. For these services, the Manager (not the Fund) pays the
      Adviser a fee, computed daily and payable monthly, at an annual rate equal
      to 40% of the fee received by the Manager, or 0.22% of the Fund's average
      daily net assets.
          An investment committee has been responsible for the day-to-day
      management of the Fund since its inception.
          The Adviser also renders investment advice to eleven open-end
      investment companies and one closed-end investment company, which together
      had aggregate assets under management of approximately $2.3 billion as of
      February 28, 1995. The Adviser also renders investment advice to private
      accounts with fixed income assets under management of approximately $10.8
      billion as of that date. The address of the Adviser is 117 East Colorado
      Boulevard, Pasadena, California 91105.
          The Adviser has managed fixed income portfolios continuously since its
      founding in 1971, and has focused exclusively on such accounts since 1984.
          In managing fixed-income portfolios, the Adviser first studies the
      range of factors that influence interest rates and develops a long-term
      interest rate forecast. It then allocates available funds to those sectors
      of the market (for example, government, corporate, or mortgage-backed
      securities), which it considers most attractive. Then it selects the
      specific issues which it believes represent the best values. All three
      decisions are integral parts of the Adviser's portfolio management process
      and contribute to its performance record.
THE FUND'S DISTRIBUTOR
          Legg Mason is the distributor of the Fund's shares pursuant to an
      Underwriting Agreement with the Corporation. The Underwriting Agreement
      obligates Legg Mason to pay certain expenses in connection with the
      offering of shares of the Fund, including any compensation to its
      investment executives, the printing and distribution of prospectuses,
      statements of additional information and periodic reports used in
      connection with the offering to prospective investors, after the
      prospectuses, statements of additional information and reports have been
      prepared, set in type and mailed to existing shareholders at the Fund's
      expense, and for any supplementary sales literature and advertising costs.
          Legg Mason also receives a fee from BFDS for assisting it with its
      transfer agent and shareholder
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<PAGE>
      servicing functions. For the year ended December 31, 1994, Legg Mason
      received $57,597 for performing such services in connection with this
      Fund.
          The Board of Directors of the Corporation has adopted a Distribution
      and Shareholder Services Plan ("Plan") pursuant to Rule 12b-1 under the
      Investment Company Act of 1940 ("1940 Act"). The Plan provides that as
      compensation for Legg Mason's ongoing services to investors in Primary
      Shares and its activities and expenses related to the sale and
      distribution of Primary Shares, the Fund pays Legg Mason, from the assets
      attributable to Primary Shares, an annual distribution fee and an annual
      service fee, each of which is equal to 0.25% of the average daily net
      assets attributable to Primary Shares. The distribution fee and the
      service fee are computed daily and paid monthly. The fees received by Legg
      Mason during any year may be more or less than its costs of providing
      distribution and shareholder services for Primary Shares.
          NASD rules limit the amount of annual distribution fees that may be
      charged by mutual funds and impose a ceiling on the cumulative
      distribution fees received. The Fund's Plan complies with those rules.
          The Chairman, President and Treasurer of the Corporation are employed
      by Legg Mason.
DESCRIPTION OF THE CORPORATION AND ITS SHARES
          The Corporation is a diversified open-end investment company which was
      incorporated in Maryland on April 28, 1987. The Articles of Incorporation
      of the Corporation permit the Board of Directors to create additional
      series (or portfolios), each of which issues a separate class of shares.
      There are currently four portfolios of the Corporation, including the
      Fund. While additional series may be created in the future, there is no
      intention at this time to form any particular additional series.
          The Corporation has authorized one billion shares of common stock, par
      value $.001 per share. The Fund currently offers two Classes of Shares --
      Class A (known as "Primary Shares") and Navigator Shares. Each Class
      represents interests in the same pool of assets of the Fund. A separate
      vote is taken by a Class of Shares of the Fund if a matter affects just
      that Class of Shares. Each Class of Shares may bear differing
      Class-specific expenses. Salespersons and others entitled to receive
      compensation for selling or servicing Fund shares may receive more with
      respect to one Class than another.
          The initial and subsequent investment minimums for Navigator Shares
      are $50,000 and $100, respectively. Investments in Navigator Shares may be
      made through investment executives of Fairfield Group, Inc., Horsham,
      Pennsylvania, or Legg Mason.
          The Fund pays no Rule 12b-1 fee with respect to Navigator Shares. The
      per share net asset value of Navigator Shares, and dividends and
      distributions (if any) paid to Navigator shareholders, are generally
      expected to be higher than those of Primary Shares of the Fund, because of
      the lower expenses attributable to Navigator Shares. Navigator Shares of
      the Fund may be exchanged for the corresponding class of shares of certain
      other Legg Mason Funds. Investments by exchange into the other Legg Mason
      Funds are made at the per share net asset value, determined on the same
      business day as redemption of the Navigator Shares the investors wish to
      redeem.
          The Board of Directors of the Fund does not anticipate that there will
      be any conflicts among the interests of the holders of the different
      Classes of Fund Shares. On an ongoing basis, the Board will consider
      whether any such conflict exists and, if so, take appropriate action.
          Shareholders of the Fund are entitled to one vote per share and
      fractional votes for fractional shares held. Voting rights are not
      cumulative. All shares of the Fund are fully paid and nonassessable and
      have no preemptive or conversion rights.
          Shareholder meetings will not be held except where the 1940 Act
      requires a shareholder vote on certain matters (including the election of
      directors, approval of an advisory contract, and approval of a plan of
      distribution pursuant to Rule 12b-1). The Corporation will call a special
      meeting of the shareholders at the request of 10% or more of the shares
      entitled to vote; shareholders wishing to call such a meeting should
      submit a written request to the Fund at 111 South Calvert Street,
      Baltimore, Maryland 21202, stating the purpose of the proposed meeting and
      the matters to be acted upon.
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