MERRILL LYNCH CALIFORNIA INSURED MUNICIPAL BOND FUND OF MERR
N-30D, 1995-04-11
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MERRILL LYNCH
CALIFORNIA
INSURED
MUNICIPAL
BOND FUND







FUND LOGO






Semi-Annual Report

February 28, 1995







This report is not authorized for use as an offer of sale or a
solicitation of an offer to buy shares of the Fund unless
accompanied or preceded by the Fund's current prospectus. Past
performance results shown in this report should not be considered a
representation of future performance. Investment return and
principal value of shares will fluctuate so that shares, when
redeemed, may be worth more or less than their original cost.


<PAGE>






Merrill Lynch
California Insured
Municipal Bond Fund
Merrill Lynch California
Municipal Series Trust
Box 9011
Princeton, NJ
08543-9011





TO OUR SHAREHOLDERS

The combination of heightened inflationary concerns, anticipation of
further tightening of monetary policy by the Federal Reserve Board,
the turmoil of the Mexican currency crisis and a weakening US dollar
all exerted negative influences on the US financial markets during
the February quarter. On the positive side, increasing signs that
the US economy may be losing momentum suggested that most of the
interest rate increases for this economic cycle may be behind us. As
a result of these economic crosscurrents, the US stock and bond
markets continued to be volatile during the period, even though the
Dow Jones Industrial Average did close above the 4000 level for the
first time.

The manufacturing sector proved to be the driving force behind the
US economy through the final weeks of 1994, making an important
contribution to the substantial increase in corporate earnings. US
companies have been successful at containing labor costs, which are
an important component of the inflation outlook. Growth in the
economy has not been translated into higher wages and benefits for
US workers. Consumer spending is growing at a slower pace than in
previous economic recoveries, and was unchanged for the month of
January. Another encouraging sign was the January increase in the
personal savings rate to the highest level in two years. However,
this is following an all-time annual low for the savings rate in
1994.

In the weeks ahead, investors will continue to assess economic data
and inflationary trends in order to gauge whether inflationary
pressures have been tempered and the economy is headed for moderate
growth (a "soft landing"), or if the lagged effect of interest rate
rises will result in a curtailment of economic growth. Investors
will also focus on the progress that the new Congress makes on both
reducing spending and the Federal budget deficit and passing tax
cuts that promote savings and investment. At this time, the recent
defeat of the balanced budget amendment in the Senate does not bode
well for the passage of sweeping fiscal reforms.
<PAGE>
The Municipal Market
The municipal bond market staged an impressive rally during the
three months ended February 28, 1995. Long-term municipal revenue
bond yields, as measured by the Bond Buyer Revenue Bond Index, fell
by 98 basis points (0.98%) to end the February quarter at 6.34%.
Long-term tax-exempt bond prices have more than recouped all of the
losses sustained during October and November 1994, and current
municipal bond yield levels have declined to six-month lows. Long-
term US Treasury bond yields exhibited a similar recovery during the
past quarter. During the February quarter, the yield on the 30-year
US Treasury bond fell approximately 60 basis points to finish the
quarter at 7.45%. The recent peak in interest rates last November
and their subsequent decline has coincided with an apparent change
in investor psychology. The series of interest rate increases
engineered by the Federal Reserve Board during 1994 ended with an
aggressive tightening of monetary policy in mid-November. This move
has, at least temporarily, restored the financial markets'
confidence in the central bank's resolve and ability to foster an
environment of moderate economic growth and minimal inflationary
pressures. Investors then turned their attention to potentially
weaker economic growth in 1995 and interest rates began to decline.
As indications of a slowing in economic growth were released in
early 1995, particularly in housing and employment, the bond market
rally intensified. The dramatic increase in bond yields seen in 1994
can now be viewed as an overreaction to excessive inflationary fears
in combination with expected strong economic growth continuing
throughout 1995. As these fears have yet to be realized, investors
viewed the yields available in late 1994 as particularly attractive
and bond prices rose accordingly.

The strong technical position of the municipal market has
intensified the recent market rally. New-issue supply during the six
months ended February 28, 1995 totaled approximately $60 billion, a
decrease of over 50% versus the comparable period a year earlier. In
recent months the pace of new issuance has slowed further. During
the February quarter, less than $25 billion in long-term securities
were issued, a decline of almost 60% versus year-ago levels. Both
January and February monthly issuance were less than $8 billion,
which represents the lowest monthly issuance levels since January
1988. Issuance thus far in 1995 has led some analysts to lower their
projections for 1995 annual issuance from the $150 billion range to
the $120 billion range. This would represent a further 20% reduction
in an already recent historically low issuance environment.

At the same time, investor demand has slowly returned to the
municipal market. Both January and February saw net cash inflows
into tax-exempt mutual bond funds, a striking reversal of flows from
that which was experienced for much of late 1994. Much of the
increase in municipal bond yields in 1994 was in large part a
response to investor liquidation of municipal mutual funds in
anticipation of additional price declines associated with expected
increases in interest rates. As both bond yields and new bond
issuance have declined in recent months, both retail and
institutional investors have been hard pressed to repurchase
securities sold in late 1994. The relative scarcity of tax-exempt
bond products is expected to continue throughout 1995, and thus
expected scarcity has intensified the recent rise in municipal bond
prices.
<PAGE>
Despite this recent rise in tax-exempt bond prices, municipal bonds
have remained attractive relative to other investment alternatives,
especially on an after-tax basis. For example, to investors in the
39% Federal income tax bracket, long-term municipal bonds currently
yielding 6.35% represent an after-tax equivalent yield of over
10.375%. Looking forward, while it is likely that interest rate
volatility will remain a factor in 1995, the magnitude of the
increase in bond yields is very unlikely to be repeated. As the
supply of tax-exempt products is likely to remain very limited
throughout 1995, presently available bond yields should prove to be
attractive to long-term investors.

Portfolio Strategy
During the February quarter, the market environment was extremely
volatile, although technical conditions provided the potential for
significant appreciation. As a result, we structured Merrill Lynch
California Insured Municipal Bond Fund's portfolio to combine low
cash equivalent reserves with above-average coupon municipal
securities. In response to market uncertainty early in the February
quarter, we overweighted the percentage of Fund assets committed to
AAA-rated enhanced paper. However, tight supply versus an improving
cash flow situation among the mutual fund groups and property and
casualty insurance companies provided a backdrop for the positive
price action we enjoyed in December and January. The Fund's fully
invested posture permitted us to participate in this price movement.

Looking forward, a more cautious approach to the fixed-income market
may be warranted. In a brief span of time, the municipal bond rally
has covered a lot of ground in terms of price appreciation. Retail
investors could reach a point where current levels, when compared to
taxable equivalent securities, lose some degree of attractiveness.
As such, we may begin to use the strength of the current market to
raise our cash position.

In Conclusion
We appreciate your investment in Merrill Lynch California Insured
Municipal Bond Fund, and we look forward to assisting you with your
financial needs in the months and years ahead.

Sincerely,


(Arthur Zeikel)
Arthur Zeikel
President


(Vincent R. Giordano)
Vincent R. Giordano
Vice President and Portfolio Manager
<PAGE>

March 23, 1995



PERFORMANCE DATA


About Fund Performance

  Since October 21, 1994, investors have been able to purchase shares
  of the Fund through the Merrill Lynch Select Pricing SM System,
  which offers four pricing alternatives:

* Class A Shares incur a maximum initial sales charge (front-end
  load) of 4% and bear no ongoing distribution or account maintenance
  fees. Class A Shares are available only to eligible investors.

* Class B Shares are subject to a maximum contingent deferred sales
  charge of 4% if redeemed during the first year, decreasing 1% each
  year thereafter to 0% after the fourth year. In addition, Class B
  Shares are subject to a distribution fee of 0.25% and an account
  maintenance fee of 0.25%. These shares automatically convert to
  Class D Shares after approximately 10 years.

* Class C Shares are subject to a distribution fee of 0.35% and an
  account maintenance fee of 0.25%. In addition, Class C Shares are
  subject to a 1% contingent deferred sales charge if redeemed within
  one year of purchase.

* Class D Shares incur a maximum initial sales charge of 4% and an
  account maintenance fee of 0.10% (but no distribution fee).

Performance data for the Fund's Class A and Class B Shares are
presented in the "Recent Performance Results," "Performance Summary"
and "Average Annual Total Return" tables below and on page 4. Data
for Class C and Class D Shares are also presented in the "Recent
Performance Results" and "Aggregate Total Return" tables below and
on page 4.

The "Recent Performance Results" table shows investment results
before the deduction of any sales charges for Class A and Class B
Shares for the 12-month and 3-month periods ended February 28, 1995
and for Class C and Class D Shares for the since inception and 3-
month periods ended February 28, 1995. All data in this table assume
imposition of the actual total expenses incurred by each class of
shares during the relevant period.

None of the past results shown should be considered a representation
of future performance. Investment return and principal value of
shares will fluctuate so that shares, when redeemed, may be worth
more or less than their original cost. Dividends paid to each class
of shares will vary because of the different levels of account
maintenance, distribution and transfer agency fees applicable to
each class, which are deducted from the income available to be paid
to shareholders.
<PAGE>

Average Annual Total Return

                                     % Return Without  % Return With
                                       Sales Charge    Sales Charge**
Class A Shares*

Year Ended 12/31/94                        -7.54%         -11.23%
Inception (2/26/93)
through 12/31/94                           -0.49           -2.67

[FN]
 *Maximum sales charge is 4%.
**Assuming maximum sales charge.

                                         % Return         % Return
                                       Without CDSC      With CDSC**

Class B Shares*

Year Ended 12/31/94                        -7.99%         -11.48%
Inception (2/26/93)
through 12/31/94                           -0.93           -2.40

[FN]
 *Maximum contingent deferred sales charge is 4% and is reduced to 0%
  after 4 years.
**Assuming payment of applicable contingent deferred sales charge.



Aggregate Total Return

                                         % Return         % Return
                                       Without CDSC      With CDSC**
Class C Shares*

Inception (10/21/94)
through 12/31/94                           -1.38%          -2.36%

[FN]
 *Maximum contingent deferred sales charge is 1% and is reduced
  to 0% after 1 year.
**Assuming payment of applicable contingent deferred sales charge.


                                     % Return Without  % Return With
                                       Sales Charge    Sales Charge**
Class D Shares*

Inception (10/21/94)
through 12/31/94                           -1.16%          -5.11%
<PAGE>
[FN]
 *Maximum sales charge is 4%.
**Assuming maximum sales charge.




PERFORMANCE DATA (concluded)

<TABLE>
Performance Summary--Class A Shares
<CAPTION>
                           Net Asset Value          Capital Gains
Period Covered           Beginning    Ending         Distributed       Dividends Paid*      % Change**
<C>                      <C>          <C>                <C>                <C>               <C>
2/26/93--12/31/93        $10.00       $10.25             --                 $0.450            +7.18%
1994                      10.25         8.97             --                  0.518            -7.54
1/1/95--2/28/95            8.97         9.54             --                  0.072            +7.28
                                                                            ------
                                                                      Total $1.040

                                                       Cumulative total return as of 2/28/95: +6.32%**

<FN>
 *Figures may include short-term capital gains distributions.
**Figures assume reinvestment of all dividends and capital gains
  distributions at net asset value on the payable date, and do not
  include sales charge; results would be lower if sales charge was
  included.
</TABLE>


<TABLE>
Performance Summary--Class B Shares
<CAPTION>
                           Net Asset Value          Capital Gains
Period Covered           Beginning    Ending         Distributed       Dividends Paid*      % Change**
<C>                      <C>          <C>                <C>                <C>               <C>
2/26/93--12/31/93        $10.00       $10.26             --                 $0.407            +6.83%
1994                      10.26         8.98             --                  0.471            -7.99
1/1/95--2/28/95            8.98         9.54             --                  0.065            +7.09
                                                                            ------
                                                                      Total $0.943

                                                       Cumulative total return as of 2/28/95: +5.26%**

<FN>
 *Figures may include short-term capital gains distributions.
**Figures assume reinvestment of all dividends and capital gains
  distributions at net asset value on the payable date, and do not
  reflect deduction of any sales charge; results would be lower if
  sales charge was deducted.
</TABLE>
<PAGE>

<TABLE>
Recent Performance Results
<CAPTION>
                                                                               12 Month   3 Month
                                                2/28/95  11/30/94   2/28/94++ % Change++  % Change
<S>                                              <C>       <C>       <C>        <C>        <C>
Class A Shares*                                  $9.54     $8.76     $9.95      -4.12%     + 8.90%
Class B Shares*                                   9.54      8.76      9.95      -4.12      + 8.90
Class C Shares*                                   9.53      8.75      9.19      +3.70      + 8.91
Class D Shares*                                   9.55      8.76      9.19      +3.92      + 9.02
Class A Shares--Total Return*                                                   +1.38(1)   +10.47(2)
Class B Shares--Total Return*                                                   +0.87(3)   +10.33(4)
Class C Shares--Total Return*                                                   +5.60(5)   +10.31(6)
Class D Shares--Total Return*                                                   +6.02(7)   +10.55(8)
Class A Shares--Standardized 30-day Yield         5.57%
Class B Shares--Standardized 30-day Yield         5.31%
Class C Shares--Standardized 30-day Yield         5.21%
Class D Shares--Standardized 30-day Yield         5.47%

<FN>
  *Investment results shown do not reflect sales charges; results
   shown would be lower if a sales charge was included.
 ++Investment results shown for Class C and Class D Shares are since
   inception (10/21/94).
(1)Percent change includes reinvestment of $0.520 per share ordinary
   income dividends.
(2)Percent change includes reinvestment of $0.132 per share ordinary
   income dividends.
(3)Percent change includes reinvestment of $0.472 per share ordinary
   income dividends.
(4)Percent change includes reinvestment of $0.120 per share ordinary
   income dividends.
(5)Percent change includes reinvestment of $0.154 per share ordinary
   income dividends.
(6)Percent change includes reinvestment of $0.118 per share ordinary
   income dividends.
(7)Percent change includes reinvestment of $0.171 per share ordinary
   income dividends.
(8)Percent change includes reinvestment of $0.129 per share ordinary
   income dividends.
</TABLE>



PORTFOLIO ABBREVIATIONS

<PAGE>
To simplify the listings of Merrill Lynch California Insured
Municipal Bond Fund's portfolio holdings in the Schedule
of Investments, we have abbreviated the names of many
of the securities according to the list at right.

AMT       Alternative Minimum Tax (subject to)
COP       Cetificates of Participation
HFA       Housing Finance Authority
RITES     Residual Interest Tax-Exempt Securities
RITR      Residual Interest Trust Receipts
VRDN      Variable Rate Demand Notes



<TABLE>
SCHEDULE OF INVESTMENTS                                                                                   (in Thousands)
<CAPTION>

S&P      Moody's       Face                                                                                      Value
Ratings  Ratings      Amount                          Issue                                                    (Note 1a)

California--98.2%
<S>      <S>         <C>      <S>                                                                                <C>
AAA      Aaa         $1,000   Anaheim, California, Public Financing Authority, Tax Allocation Revenue
                              Bonds, RITES, 8.432% due 12/28/2018 (d)(e)                                         $ 1,061

AAA      Aaa          3,920   Brea, California, Redevelopment Agency, Tax Allocation Refunding Bonds
                              (Redevelopment Project A-B), 6.125% due 8/01/2013 (d)                                3,969

                              California Health Facilities Financing Authority Revenue Bonds, Series A:
BBB      Baa1         2,000     Refunding (Health Dimensions), 7.50% due 5/01/2015                                 2,055
AAA      Aaa          2,000     (Scripps Memorial Hospital), 6.375% due 10/01/2022 (d)                             2,036
Aa+      VMIG1++        200     (Sutter Health), VRDN, 3.70% due 3/01/2020 (a)                                       200

AA-      Aa           2,000   California HFA, Home Mortgage Revenue Bonds, AMT, Series F1, 7% due 8/01/2026        2,059

NR*      P1             900   California Pollution Control Financing Authority, Resource Recovery
                              Revenue Refunding Bonds (Ultra Power Malaga Project), VRDN, AMT, Series A,
                              3.95% due 4/01/2017 (a)                                                                900

A1+      VMIG1++      2,000   California Pollution Control Financing Authority, Solid Waste Disposal
                              Revenue Bonds (Shell Oil Co.--Martinez Project), VRDN, AMT, Series A, 3.95%
                              due 10/01/2024 (a)                                                                   2,000

                              California State, Public Works Board, Lease Revenue Bonds, Series A:
A-       A            2,000     (Department of Corrections--Monterey County), 7% due 11/01/2019                    2,089
AAA      Aaa          4,000     (Various University of California Projects), 6.40% due 12/01/2016 (b)              4,105

AAA      Aaa          2,360   Central Coast Water Authority, California, Revenue Bonds (State Water
                              Project Regional Facilities), 6.50% due 10/01/2014 (b)                               2,438
<PAGE>
AAA      Aaa          2,000   Cerritos, California, Public Financing Authority, Revenue Refunding Bonds
                              (Los Coyotes Redevelopment Project Loan), Series A, 6.50% due 11/01/2023 (b)         2,156

AAA      Aaa          2,000   Contra Costa, California, Water Authority, Water Treatment Revenue Refunding
                              Bonds, Series A, 5.75% due 10/01/2020 (c)                                            1,915

AAA      Aaa          3,000   Coronado, California, Community Development Agency, Tax Allocation Revenue
                              Bonds (Coronado Community Development Project), 6.30% due 9/01/2022 (d)              3,029

AAA      Aaa          1,200   Cucamonga County, California, Water District Facilities Refinancing Bonds,
                              COP, 6.50% due 9/01/2022 (c)                                                         1,233

AAA      Aaa          4,000   El Cajon, California, Redevelopment Agency, Tax Allocation Revenue Bonds
                              (El Cajon Redevelopment Project), 6.60% due 10/01/2022 (b)                           4,164

AAA      Aaa          2,235   Eureka, California, Public Financing Authority, Tax Allocation Revenue
                              Refunding Bonds (Eureka Redevelopment Projects), 6.25% due 11/01/2011 (f)            2,287

AAA      Aaa          2,500   Fresno, California, Sewer Revenue Bonds (Fowler Avenue Project), Series A,
                              6.25% due 8/01/2011 (b)                                                              2,559

AAA      Aaa          2,500   Industry, California, Urban Development Agency, Revenue Refunding Bonds
                              (Transportation District Industrial Redevelopment Project 2), 6.50% due
                              11/01/2016 (d)                                                                       2,602

AAA      Aaa          2,500   Los Angeles, California, Convention and Exhibition Center Authority,
                              Lease Revenue Refunding Bonds, Series A, 6% due 8/15/2010 (d)                        2,553
</TABLE>



<TABLE>
SCHEDULE OF INVESTMENTS (concluded)                                                                       (in Thousands)
<CAPTION>

S&P      Moody's       Face                                                                                      Value
Ratings  Ratings      Amount                          Issue                                                    (Note 1a)

California (concluded)
<S>      <S>         <C>      <S>                                                                                <C>
AA       Aa          $2,000   Los Angeles, California, Department of Water and Power, Electric Plant
                              Revenue Bonds, Registered RITR, 7.229% due 2/01/2020 (e)                           $ 2,030

AAA      Aaa          2,000   Los Angeles, California, Harbor Department Revenue Bonds, AMT, Series B,
                              6.625% due 8/01/2019 (b)                                                             2,051

AAA      Aaa          1,000   Los Angeles, California, Wastewater System Revenue Bonds, Series B, 6.25%
                              due 6/01/2012 (b)                                                                    1,023

AAA      Aaa          2,000   Los Angeles County, California, COP (Correctional Facilities Project),
                              6.50% due 9/01/2013 (d)                                                              2,061
<PAGE>
A1+      VMIG1++        500   Los Angeles County, California, Metropolitan Transportation Authority,
                              Sales Tax Revenue Refunding Bonds (Proposition C--Second Senior), VRDN,
                              Series A, 3.90% due 7/01/2020 (a)(d)                                                   500

AAA      Aaa          2,000   M-S-R Public Power Agency, California, Revenue Refunding Bonds (San
                              Juan Project), Series F, 6% due 7/01/2020 (b)                                        1,977

AAA      Aaa          1,000   Mesa, California, Consolidated Water District, COP (Water Project),
                              6.375% due 3/15/2012 (c)                                                             1,036

AAA      Aaa          2,500   Mountain View, California, Capital Improvements Financing Authority
                              Revenue Bonds (City Hall Community Theatre), 6.50% due 8/01/2016 (d)                 2,573

AAA      Aaa          3,500   Northern California Public Power Agency, Revenue Refunding Bonds
                              (Hydroelectric Project No. 1), Series A, 6.25% due 7/01/2012 (d)                     3,579

NR*      Baa          1,405   Pleasanton, California, Joint Powers Financing Authority, Revenue Reassessment
                              Bonds, Series A, 6.15% due 9/02/2012                                                 1,357

                              Sacramento, California, Municipal Utility District, Electric Revenue Bonds (d):
AAA      Aaa          1,500     Refunding, Series G, 6.50% due 9/01/2013                                           1,616
AAA      Aaa          3,000     Series B, 6.375% due 8/15/2022                                                     3,063

                              San Francisco, California, City and County Airport Commission, International
                              Airport, Revenue Refunding Bonds, Second Series:
AAA      Aaa          2,000     First Issue, 6.30% due 5/01/2011 (b)                                               2,054
AAA      Aaa          2,500     Second Issue, 6.75% due 5/01/2020 (d)                                              2,625

AAA      Aaa          2,235   San Mateo County, California, Joint Powers Financing Authority, Lease
                              Revenue Refunding Bonds (Capital Projects Program), 6.50% due 7/01/2015 (d)          2,412

AAA      Aaa          2,500   Stockton, California, COP, Revenue Bonds (Wastewater Treatment Plant
                              Expansion), Series A, 6.70% due 9/01/2014(c)                                         2,646

                              University of California Revenue Bonds (Multiple Purpose Projects):
AAA      Aaa          2,500     Refunding, Series C, 5% due 9/01/2023 (b)                                          2,119
AAA      Aaa          2,235     Series D, 6.30% due 9/01/2015 (d)                                                  2,268

AAA      Aaa          3,725   West Sacramento, California, Redevelopment Agency, Tax Allocation Bonds
                              (West Sacramento Redevelopment Project), 6.25% due 9/01/2021 (d)                     3,752
                                                                                                                 -------
Total Investments (Cost--$86,084)--98.2%                                                                          86,152

Other Assets Less Liabilities--1.8%                                                                                1,619
                                                                                                                 -------
Net Assets--100.0%                                                                                               $87,771
                                                                                                                 =======
<PAGE>
<FN>
(a)The interest rate is subject to change periodically based upon
   prevailing market rates. The interest rate shown is the rate
   in effect at February 28, 1995.
(b)AMBAC Insured.
(c)FGIC Insured.
(d)MBIA Insured.
(e)The interest rate is subject to change periodically and
   inversely to the prevailing market rates. The interest rate
   shown is the rate in effect at February 28, 1995.
(f)Capital Guaranty.
  *Not Rated.
 ++Highest short-term rating by Moody's Investors Service, Inc.


See Notes to Financial Statements.
</TABLE>



FINANCIAL INFORMATION

<TABLE>
Statement of Assets and Liabilities as of February 28, 1995
<S>                 <S>                                                                     <C>              <C>
Assets:             Investments, at value (identified cost--$86,083,818) (Note 1a)                           $86,152,273
                    Cash                                                                                          12,214
                    Receivables:
                      Interest                                                              $ 1,482,230
                      Beneficial interest sold                                                  535,730        2,017,960
                                                                                            -----------
                    Deferred organization expenses (Note 1e)                                                      39,939
                    Prepaid expenses and other assets (Note 1e)                                                   60,537
                                                                                                             -----------
                    Total assets                                                                              88,282,923
                                                                                                             -----------

Liabilities:        Payables:
                      Beneficial interest redeemed                                              280,803
                      Dividends to shareholders (Note 1f)                                        85,802
                      Distributor (Note 2)                                                       27,473
                      Investment adviser (Note 2)                                                 9,970          404,048
                                                                                            -----------
                    Accrued expenses and other liabilities                                                       107,659
                                                                                                             -----------
                    Total liabilities                                                                            511,707
                                                                                                             -----------

Net Assets:         Net assets                                                                               $87,771,216
                                                                                                             ===========
<PAGE>
Net Assets          Class A Shares of beneficial interest, $.10 par value,
Consist of:         unlimited number of shares authorized                                                    $   154,640
                    Class B Shares of beneficial interest, $.10 par value,
                    unlimited number of shares authorized                                                        760,210
                    Class C Shares of beneficial interest, $.10 par value,
                    unlimited number of shares authorized                                                          2,670
                    Class D Shares of beneficial interest, $.10 par value,
                    unlimited number of shares authorized                                                          2,741
                    Paid-in capital in excess of par                                                          91,507,018
                    Accumulated realized capital losses--net                                                  (4,358,779)
                    Accumulated distributions in excess of realized capital gains--net                          (365,739)
                    Unrealized appreciation on investments--net                                                   68,455
                                                                                                             ===========
                    Net assets                                                                               $87,771,216
                                                                                                             ===========

Net Asset Value:    Class A--Based on net assets of $14,748,079 and 1,546,397
                    shares of beneficial interest outstanding                                                $      9.54
                                                                                                             ===========
                    Class B--Based on net assets of $72,507,046 and 7,602,103
                    shares of beneficial interest outstanding                                                $      9.54
                                                                                                             ===========
                    Class C--Based on net assets of $254,463 and 26,704
                    shares of beneficial interest outstanding                                                $      9.53
                                                                                                             ===========
                    Class D--Based on net assets of $261,628 and 27,406
                    shares of beneficial interest outstanding                                                $      9.55
                                                                                                             ===========


                    See Notes to Financial Statements.
</TABLE>


FINANCIAL INFORMATION (continued)

<TABLE>
Statement of Operations
<CAPTION>
                                                                                                      For the Six Months
                                                                                                 Ended February 28, 1995
<S>                 <C>                                                                     <C>              <C>
Investment Income   Interest and amortization of premium and discount earned                                 $ 2,616,442
(Note 1d):
<PAGE>
Expenses:           Investment advisory fees (Note 2)                                       $   232,924
                    Distribution fees--Class B (Note 2)                                         173,812
                    Registration fees (Note 1e)                                                  28,745
                    Professional fees                                                            27,990
                    Accounting services (Note 2)                                                 23,920
                    Transfer agent fees--Class B (Note 2)                                        16,372
                    Printing and shareholder reports                                             15,174
<PAGE>              Custodian fees                                                                6,725
                    Amortization of organization expenses (Note 1e)                               5,418
                    Pricing fees                                                                  3,383
                    Transfer agent fees--Class A (Note 2)                                         2,864
                    Trustees' fees and expenses                                                   2,412
                    Distribution fees--Class C (Note 2)                                             302
                    Account maintenance fees--Class D (Note 2)                                      168
                    Transfer agent fees--Class D (Note 2)                                            64
                    Transfer agent fees--Class C (Note 2)                                            25
                    Other                                                                         1,671
                                                                                            -----------
                    Total expenses before reimbursement                                         541,969
                    Reimbursement of expenses (Note 2)                                         (176,090)
                                                                                            -----------
                    Total expenses after reimbursement                                                           365,879
                                                                                                             -----------
                    Investment income--net                                                                     2,250,563
                                                                                                             -----------

Realized &          Realized loss on investments--net                                                         (2,171,526)
Unrealized          Change in unrealized appreciation/depreciation on investments--net                         1,907,512
Gain (Loss) on                                                                                               -----------
Investments--Net    Net Increase in Net Assets Resulting from Operations                                     $ 1,986,549
(Notes 1b, 1d & 3):                                                                                          ===========



                    See Notes to Financial Statements.
</TABLE>


FINANCIAL INFORMATION (continued)


<TABLE>
Statements of Changes in Net Assets
<CAPTION>
                                                                                              For the          For the
                                                                                             Six Months         Year
                                                                                               Ended            Ended
                                                                                            February 28,      August 31,
Increase (Decrease) in Net Assets:                                                              1995             1994
<S>                 <S>                                                                     <C>              <C>
Operations:         Investment income--net                                                  $ 2,250,563      $ 4,410,272
                    Realized loss on investments--net                                        (2,171,526)      (1,974,493)
                    Change in unrealized appreciation/depreciation on
                    investments--net                                                          1,907,512       (4,299,648)
                                                                                            -----------      -----------
                    Net increase (decrease) in net assets resulting from operations           1,986,549       (1,863,869)
                                                                                            -----------      -----------
<PAGE>
Dividends           Investment income--net:
& Distributions       Class A                                                                  (422,558)        (874,505)
To Shareholders       Class B                                                                (1,815,932)      (3,535,767)
(Note 1f):            Class C                                                                    (2,596)              --
                      Class D                                                                    (9,477)              --
                    In excess of realized gain on investments--net:
                      Class A                                                                        --          (67,794)
                      Class B                                                                        --         (297,945)
                                                                                            -----------      -----------
                    Net decrease in net assets resulting from dividends
                    and distributions to shareholders                                        (2,250,563)      (4,776,011)
                                                                                            -----------      -----------

Beneficial          Net increase (decrease) in net assets derived from
Interest            beneficial interest transactions                                         (2,892,932)        7,602,289
Transactions                                                                                -----------      -----------
(Note 4):

Net Assets:         Total increase (decrease) in net assets                                  (3,156,946)         962,409
                    Beginning of period                                                      90,928,162       89,965,753
                                                                                            -----------      -----------

                    End of period                                                           $87,771,216      $90,928,162
                                                                                            ===========      ===========


                    See Notes to Financial Statements.
</TABLE>


FINANCIAL INFORMATION (continued)

<TABLE>
Financial Highlights
<CAPTION>
                                                                      Class A                         Class B
                                                            For the             For the    For the                For the
                                                              Six     For the   Period       Six      For the     Period
The following per share data and ratios have been derived    Months    Year     Feb. 26,    Months      Year     Feb. 26,
from information provided in the financial statements.       Ended     Ended   1993++ to    Ended      Ended    1993++ to
                                                            Feb. 28,  Aug. 31,  Aug. 31,   Feb. 28,   Aug. 31,   Aug. 31,
Increase (Decrease) in Net Asset Value:                       1995      1994      1993       1995       1994       1993
<S>                 <S>                                     <C>       <C>       <C>        <C>        <C>        <C>
Per Share           Net asset value, beginning of period    $  9.54   $ 10.23   $ 10.00    $  9.54    $ 10.23    $ 10.00
Operating                                                   -------   -------   -------    -------    -------    -------
Performance:        Investment income--net                      .26       .51       .24        .25        .46        .22
                    Realized and unrealized (gain) loss
                     on investments--net                         --      (.65)      .23         --       (.65)       .23
                                                            -------   -------   -------    -------    -------    -------
<PAGE>              Total from investment operations            .26      (.14)      .47        .25       (.19)       .45
                                                            -------   -------   -------    -------    -------    -------
                    Less dividends and distributions:
                     Investment income--net                    (.26)     (.51)     (.24)      (.25)      (.46)      (.22)
                     In excess of realized gain on
                     investments--net                            --      (.04)       --         --       (.04)        --
                                                            -------   -------   -------    -------    -------    -------
                    Total dividends and distributions          (.26)     (.55)     (.24)      (.25)      (.50)      (.22)
                                                            -------   -------   -------    -------    -------    -------
                    Net asset value, end of period          $  9.54   $  9.54   $ 10.23    $  9.54    $  9.54    $ 10.23
                                                            =======   =======   =======    =======    =======    =======
<PAGE>
Total Investment    Based on net asset value per share        2.92%+++ (1.44%)    4.81%+++   2.66%+++  (1.93%)     4.56%+++
Return:**                                                   =======   =======   =======    =======    =======    =======

Ratios to           Expenses, excluding distribution fees
Average             and net of reimbursement                   .45%*     .33%      .14%*      .45%*      .33%       .14%*
Net Assets:                                                 =======   =======   =======    =======    =======    =======
                    Expenses, net of reimbursement             .45%*     .33%      .14%*      .95%*      .83%       .64%*
                                                            =======   =======   =======    =======    =======    =======
                    Expenses                                   .86%*     .96%     1.06%*     1.37%*     1.46%      1.56%*
                                                            =======   =======   =======    =======    =======    =======
                    Investment income--net                    5.73%*    5.16%     4.80%*     5.22%*     4.67%      4.31%*
                                                            =======   =======   =======    =======    =======    =======

Supplemental        Net assets, end of period (in
Data:               thousands)                              $14,748   $15,946   $17,105    $72,507    $74,982    $72,861
                                                            =======   =======   =======    =======    =======    =======
                    Portfolio turnover                       30.16%    93.04%    74.26%     30.16%     93.04%     74.26%
                                                            =======   =======   =======    =======    =======    =======


                 <FN>
                   *Annualized.
                  **Total investment returns exclude the effects of sales loads.
                  ++Commencement of Operations.
                 +++Aggregate total investment return.

                    See Notes to Financial Statements.
</TABLE>




FINANCIAL INFORMATION (concluded)

<PAGE>
<TABLE>
Financial Highlights (concluded)
<CAPTION>
The following per share data and ratios have been derived                                         For the Period
from information provided in the financial statements.                                           October 21, 1994++
                                                                                                to February 28, 1995
Increase (Decrease) in Net Asset Value:                                                       Class C          Class D
<S>                 <S>                                                                     <C>              <C>
Per Share           Net asset value, beginning of period                                    $      9.19      $      9.19
Operating                                                                                   -----------      -----------
Performance:        Investment income--net                                                          .16              .18
                    Realized and unrealized gain on investments--net                                .34              .36
                                                                                            -----------      -----------
                    Total from investment operations                                                .50              .54
                                                                                            -----------      -----------
                    Less dividends from investment income--net                                     (.16)            (.18)
                                                                                            -----------      -----------
                    Net asset value, end of period                                          $      9.53      $      9.55
                                                                                            ===========      ===========

Total Investment    Based on net asset value per share                                            5.60%+++         6.02%+++
Return:**                                                                                   ===========      ===========

Ratios to           Expenses, excluding account maintenance and distribution fees
Average             and net of reimbursement                                                       .47%*            .45%*
Net Assets:                                                                                 ===========      ===========
                    Expenses, net of reimbursement                                                1.07%*            .55%*
                                                                                            ===========      ===========
                    Expenses                                                                      1.47%*            .95%*
                                                                                            ===========      ===========
                    Investment income--net                                                        5.17%*           5.62%*
                                                                                            ===========      ===========

Supplemental        Net assets, end of period (in thousands)                                $       254      $       262
Data:                                                                                       ===========      ===========
                    Portfolio turnover                                                           30.16%           30.16%
                                                                                            ===========      ===========

<FN>
                   *Annualized.
                  **Total investment returns exclude the effects of sales loads.
                  ++Commencement of Operations.
                 +++Aggregate total investment return.

                    See Notes to Financial Statements.
</TABLE>


<PAGE>
NOTES TO FINANCIAL STATEMENTS

1. Significant Accounting Policies:
Merrill Lynch California Insured Municipal Bond Fund (the "Fund") is
part of Merrill Lynch California Municipal Series Trust (the
"Trust"). The Fund is registered under the Investment Company Act of
1940 as a non-diversified, open-end management investment company.
These unaudited financial statements reflect all adjustments which
are, in the opinion of management, necessary to a fair statement of
the results for the interim period presented. All such adjustments
are of a normal recurring nature. The Fund offers four classes of
shares under the Merrill Lynch Select Pricing SM System. Shares of
Class A and Class D are sold with a front-end sales charge. Shares
of Class B and Class C may be subject to a contingent deferred sales
charge. All classes of shares have identical voting, dividend,
liquidation and other rights and the same terms and conditions,
except that Class B, Class C and Class D Shares bear certain
expenses related to the account maintenance of such shares, and
Class B and Class C Shares also bear certain expenses related to the
distribution of such shares. Each class has exclusive voting rights
with respect to matters relating to its account maintenance and
distribution expenditures. The following is a summary of significant
accounting policies followed by the Fund.

(a) Valuation of investments--Municipal bonds and other portfolio
securities in which the Fund invests are traded primarily in the
over-the-counter municipal bond and money markets and are valued at
the last available bid price in the over-the-counter market or on
the basis of yield equivalents as obtained from one or more dealers
that make markets in the securities. Financial futures contracts and
options thereon, which are traded on exchanges, are valued at their
settlement prices as of the close of such exchanges. Short-term
investments with remaining maturities of sixty days or less are
valued on an amortized cost basis, which approximates market value.
Securities and assets for which market quotations are not readily
available are valued at fair value as determined in good faith by or
under the direction of the Trustees of the Trust, including
valuations furnished by a pricing service retained by the Trust,
which may utilize a matrix system for valuations. The procedures of
the pricing service and its valuations are reviewed by the officers
of the Trust under the general supervision of the Trustees.

(b) Derivative financial instruments--The Fund may engage in various
portfolio strategies to seek to increase its return by hedging its
portfolio against adverse movements in the debt markets. Losses may
arise due to changes in the value of the contract or if the
counterparty does not perform under the contract.
<PAGE>
* Financial futures contracts--The Fund may purchase or sell interest
rate futures contracts and options on such futures contracts for the
purpose of hedging the market risk on existing securities or the
intended purchase of securities. Futures contracts are contracts for
delayed delivery of securities at a specific future date and at a
specific price or yield. Upon entering into a contract, the Fund
deposits and maintains as collateral such initial margin as required
by the exchange on which the transaction is effected. Pursuant to
the contract, the Fund agrees to receive from or pay to the broker
an amount of cash equal to the daily fluctuation in value of the
contract. Such receipts or payments are known as variation margin
and are recorded by the Fund as unrealized gains or losses. When the
contract is closed, the Fund records a realized gain or loss equal
to the difference between the value of the contract at the time it
was opened and the value at the time it was closed.

(c) Income taxes--It is the Fund's policy to comply with the
requirements of the Internal Revenue Code applicable to regulated
investment companies and to distribute substantially all of its
taxable income to its shareholders. Therefore, no Federal income tax
provision is required.

(d) Security transactions and investment income--Security
transactions are recorded on the dates the transactions are entered
into (the trade dates). Interest income is recognized on the accrual
basis. Discounts and market premiums are amortized into interest
income. Realized gains and losses on security transactions are
determined on the identified cost basis.

(e) Deferred organization expenses and prepaid registration fees--
Deferred organization expenses are charged to expense on a straight-
line basis over a five-year period. Prepaid registration fees are
charged to expense as the related shares are issued.

(f) Dividends and distributions--Dividends from net investment
income are declared daily and paid monthly. Distributions of capital
gains are recorded on the ex-dividend dates. Distributions in excess
of realized capital gains are due primarily to differing tax
treatments for futures transactions and post-October losses.

2. Investment Advisory Agreement and Transactions with Affiliates:
The Fund has entered into an Investment Advisory Agreement with Fund
Asset Management, L.P. ("FAM"). The general partner of FAM is
Princeton Services, Inc. ("PSI"), an indirect wholly-owned
subsidiary of Merrill Lynch & Co., Inc. ("ML & Co."), which is the
limited partner. The Fund has also entered into a Distribution
Agreement and Distribution Plans with Merrill Lynch Funds
Distributor, Inc. ("MLFD" or "Distributor"), a wholly-owned
subsidiary of Merrill Lynch Group, Inc.
<PAGE>
FAM is responsible for the management of the Fund's portfolio and
provides the necessary personnel, facilities, equipment and certain
other services necessary to the operations of the Fund. For such
services, the Fund pays a monthly fee based upon the average daily
value of the Fund's net assets at the following annual rates: 0.55%
of the Fund's average daily net assets not exceeding $500 million;
0.525% of average daily net assets in excess of $500 million but not
exceeding $1 billion; and 0.50% of average daily net assets in
excess of $1 billion. The Investment Advisory Agreement obligates
FAM to reimburse the Fund to the extent the Fund's expenses
(excluding interest, taxes, distribution fees, brokerage fees and
commissions, and extraordinary items) exceed 2.5% of the Fund's
first $30 million of average daily net assets, 2.0% of the next $70
million of average daily net assets, and 1.5% of the average daily
net assets in excess thereof. FAM's obligation to reimburse the Fund
is limited to the amount of the management fee. No fee payment will
be made to FAM during any fiscal year which will cause such expenses
to exceed expense limitations at the time of such payment. For the
six months ended February 28, 1995, FAM earned fees of $232,924, of
which $176,090 was voluntarily waived.

Pursuant to the distribution plans ("the Distribution Plans")
adopted by the Fund in accordance with Rule 12b-1 under the
Investment Company Act of 1940, the Fund pays the Distributor
ongoing account maintenance and distribution fees. The fees are
accrued daily and paid monthly at annual rates based upon the
average daily net assets of the shares as follows:

                                           Account      Distribution
                                       Maintenance Fee      Fee

Class B                                     0.25%          0.25%
Class C                                     0.25%          0.35%
Class D                                     0.10%             --

Pursuant to a sub-agreement with the Distributor, Merrill Lynch,
Pierce, Fenner & Smith Inc. ("MLPF&S"), a subsidiary of ML & Co.,
also provides account maintenance and distribution services to the
Fund. The ongoing account maintenance fee compensates the
Distributor and MLPF&S for providing account maintenance services to
Class B, Class C and Class D shareholders. The ongoing distribution
fee compensates the Distributor and MLPF&S for providing shareholder
and distribution-related services to Class B and Class C
shareholders.

For the six months ended February 28, 1995, MLFD earned underwriting
discounts and MLPF&S earned dealer concessions on sales of the
Fund's Class A and Class D Shares as follows:

<PAGE>
                                         MLFD         MLPF&S

Class A                                  $884        $11,046
Class D                                  $251        $ 3,393

MLPF&S received contingent deferred sales charges of $208,640
relating to transactions in Class B Shares of beneficial interest
for the six months ended February 28, 1995.

Financial Data Services, Inc. ("FDS"), a wholly-owned subsidiary of
ML & Co., is the Fund's transfer agent.

Accounting services are provided to the Fund by FAM at cost.

Certain officers and/or trustees of the Fund are officers and/or
directors of FAM, PSI, MLPF&S, FDS, MLFD, and/or ML & Co.


NOTES TO FINANCIAL STATEMENTS (concluded)


3. Investments:
Purchases and sales of investments, excluding short-term securities,
for the six months ended February 28, 1995 were $24,955,336 and
$25,576,164, respectively.

Net realized and unrealized gains (losses) as of February 28, 1995
were as follows:

                                    Realized       Unrealized
                                     Losses          Gains

Long-term investments             $(1,888,564)   $    68,455
Financial futures contracts          (282,962)            --
                                  -----------    -----------
Total                             $(2,171,526)   $    68,455
                                  ===========    ===========


As of February 28, 1995, net unrealized appreciation for Federal
income tax purposes aggregated $68,455, of which $1,490,975 related
to appreciated securities and $1,422,520 related to depreciated
securities. The aggregate cost of investments at February 28, 1995
for Federal income tax purposes was $86,083,818.

4. Beneficial Interest Transactions:
Net increase (decrease) in net assets derived from beneficial
interest transactions was $(2,892,932) and $7,602,289 for the six
months ended February 28, 1995 and the year ended August 31, 1994,
respectively.
<PAGE>
Transactions in shares of beneficial interest for each class were as
follows:

Class A Shares for the Six                         Dollar
Months Ended Feb. 28, 1995           Shares        Amount

Shares sold                           134,485    $ 1,218,841
Shares issued to shareholders
in reinvestment of dividends           18,210        165,342
                                  -----------    -----------
Total issued                          152,695      1,384,183
Shares redeemed                      (277,842)    (2,499,698)
                                  -----------    -----------
Net decrease                         (125,147)   $(1,115,515)
                                  ===========    ===========



Class A Shares for the Year                        Dollar
Ended August 31, 1994                Shares        Amount

Shares sold                           301,766    $ 3,002,096
Shares issued to shareholders
in reinvestment of dividends
and distributions                      39,457        389,777
                                  -----------    -----------
Total issued                          341,223      3,391,873
Shares redeemed                      (342,542)    (3,318,587)
                                  -----------    -----------
Net increase (decrease)                (1,319)   $    73,286
                                  ===========    ===========


Class B Shares for the
Six Months Ended                                   Dollar
February 28, 1995                    Shares        Amount

Shares sold                         1,087,048    $ 9,879,838
Shares issued to share-
holders in reinvestment of
dividends                              95,159        864,896
                                  -----------    -----------
Total issued                        1,182,207     10,744,734
Shares redeemed                    (1,439,662)   (12,980,933)
                                  -----------    -----------
Net decrease                         (257,455)   $(2,236,199)
                                  ===========    ===========

<PAGE>
Class B Shares for the
Year Ended                                         Dollar
August 31, 1994                      Shares        Amount

Shares sold                         1,864,973    $18,580,245
Shares issued to shareholders
in reinvestment of dividends
and distributions                     198,811      1,962,586
                                  -----------    -----------
Total issued                        2,063,784     20,542,831
Shares redeemed                    (1,329,588)   (13,013,828)
                                  -----------    -----------
Net increase                          734,196    $ 7,529,003
                                  ===========    ===========


Class C Shares for the
Period October 21, 1994++ to                       Dollar
February 28, 1995                    Shares        Amount

Shares sold                            33,762    $   305,453
Shares issued to share-
holders in reinvestment of
dividends                                  25            232
                                  -----------    -----------
Total issued                           33,787        305,685
Shares redeemed                        (7,083)       (60,640)
                                  -----------    -----------
Net increase                           26,704    $   245,045
                                  ===========    ===========

[FN]
++Commencement of Operations.


Class D Shares for the
Period October 21, 1994++ to                       Dollar
February 28, 1995                    Shares        Amount

Shares sold                           132,703    $ 1,187,888
Shares issued to share-
holders in reinvestment of
dividends                                  56            516
                                  -----------    -----------
Total issued                          132,759      1,188,404
Shares redeemed                      (105,353)      (974,667)
                                  -----------    -----------
Net increase                           27,406    $   213,737
                                  ===========    ===========
<PAGE>
[FN]
++Commencement of Operations.



OFFICERS AND TRUSTEES

Arthur Zeikel, President and Trustee
Herbert I. London, Trustee
Robert R. Martin, Trustee
Joseph L. May, Trustee
Andre F. Perold, Trustee
Terry K. Glenn, Executive Vice President
Donald C. Burke, Vice President
Vincent R. Giordano, Vice President
Kenneth A. Jacob, Vice President
Gerald M. Richard, Treasurer
Jerry Weiss, Secretary


Custodian
The Bank of New York
90 Washington Street
New York, New York 10286

Transfer Agent
Financial Data Services, Inc.
4800 Deer Lake Drive East
Jacksonville, Florida 32246-6484
(800) 637-3863



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