NATIONAL HEALTH LABORATORIES INC
10-Q, 1994-05-10
TESTING LABORATORIES
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                   UNITED STATES SECURITIES AND EXCHANGE COMMISSION
                                WASHINGTON, D.C. 20549
                                      FORM 10-Q


          (Mark One)

          [X]  QUARTERLY  REPORT PURSUANT  TO SECTION  13 OR  15(d) OF  THE
               SECURITIES EXCHANGE ACT OF 1934

          For the quarterly period ended           MARCH 31, 1994
                                        -----------------------------------

                                          OR
          [ ]  TRANSITION REPORT  PURSUANT TO  SECTION 13 OR  15(d) OF  THE
               SECURITIES EXCHANGE ACT OF 1934

          For the transition period from                to
                                        ---------------     ---------------

          Commission file number                  1-10740
                                 ------------------------------------------

                      NATIONAL HEALTH LABORATORIES INCORPORATED
          -----------------------------------------------------------------
                (Exact name of registrant as specified in its charter)

                          DELAWARE                          84-0611484
          -----------------------------------------------------------------
               (State or other jurisdiction of         (I.R.S. Employer
               incorporation or organization)          Identification No.)


               4225 EXECUTIVE SQUARE, SUITE 800, LA JOLLA, CALIFORNIA 92037
          -----------------------------------------------------------------
             (Address of principal executive offices)          (Zip code)

                                     619-550-0600
          -----------------------------------------------------------------
                 (Registrant's telephone number, including area code)



          Indicate by check mark  whether the registrant (1) has  filed all
          reports required  to  be filed  by  Section 13  or  15(d) of  the
          Securities Exchange Act  of 1934 during  the preceding 12  months
          (or for such shorter  period that the registrant was  required to
          file  such reports)  and  (2) has  been  subject to  such  filing
          requirements for the past 90 days.  Yes  X   No    

          The  number of shares outstanding of the issuer's common stock is
          84,750,692  shares  as of  April  30, 1994,  of  which 20,176,729
          shares are held  by an indirect wholly-owned  subsidiary of Mafco
          Holdings Inc. <PAGE>
 

<PAGE>
<TABLE>
              NATIONAL HEALTH LABORATORIES INCORPORATED AND SUBSIDIARIES
                        CONSOLIDATED CONDENSED BALANCE SHEETS
                     (Dollars in Millions, except per share data)
<CAPTION>
                                                    March 31,    December 31,
                                                      1994           1993    
                                                  -----------    ------------
                                                  (Unaudited)
          <S>                                     <C>             <C>
                          ASSETS
          Current assets:
            Cash and cash equivalents              $  29.4         $  12.3
            Accounts receivable, net                 139.4           119.0
            Prepaid expenses and other                26.5            21.7
            Deferred income taxes                     20.2            21.6
            Income taxes receivable                    0.9             8.7
                                                   -------         -------
                Total current assets                 216.4           183.3

          Property, plant and equipment, net         105.6           100.1
          Intangible assets, net                     294.1           281.5
          Other assets, net                           16.3            20.6
                                                   -------         -------
                                                   $ 632.4         $ 585.5
                                                   =======         =======
            LIABILITIES AND STOCKHOLDERS' EQUITY
          Current liabilities:
            Accounts payable                       $  38.4         $  36.9
            Dividend payable                           6.8             6.8
            Accrued expenses and other                62.0            55.6
            Current portion of accrued
              settlement expenses                     16.8            21.6
                                                   -------         -------
              Total current liabilities              124.0           120.9

          Revolving credit facility                  324.0           278.0
          Capital lease obligation                     9.8             9.7
          Accrued settlement expenses, less
            current portion                            7.4            11.5
          Deferred income taxes                        5.0             3.1
          Other liabilities                           20.1            21.5
          Stockholders' equity:
            Preferred stock, $0.10 par value;
              10,000,000 shares authorized; 
              none issued                               --             --
            Common stock, $0.01 par value;
              220,000,000 shares authorized; 
              99,354,492 shares issued at 
              March 31, 1994 and 
              December 31, 1993, respectively          1.0             1.0
          Additional paid-in capital                 226.3           226.3
          Retained earnings                          203.3           202.0
          Minimum pension liability adjustment        (2.4)           (2.4)
          Treasury stock, at cost; 14,603,800 
            shares of common stock at 
            March 31, 1994 and December 31, 1993,
            respectively                            (286.1)         (286.1)
                                                   -------         -------
            Total stockholders' equity               142.1           140.8
                                                   -------         -------
                                                   $ 632.4         $ 585.5
                                                   =======         =======
<FN>
         See notes to unaudited consolidated condensed financial statements.
</TABLE>
         

<PAGE>
<PAGE>
<TABLE>

              NATIONAL HEALTH LABORATORIES INCORPORATED AND SUBSIDIARIES
                    CONSOLIDATED CONDENSED STATEMENTS OF EARNINGS
                     (Dollars in Millions, except per share data)
                                     (Unaudited)
<CAPTION>
                                                        Three Months Ended
                                                            March 31,     
                                                      --------------------
                                                        1994         1993 
                                                      -------      -------
          <S>                                         <C>          <C>
          Net sales                                   $ 185.0      $ 199.8  

          Cost of sales                                 132.3        109.1
                                                      -------      -------
          Gross profit                                   52.7         90.7

          Selling, general and
            administrative expenses                      31.0         31.3 

          Amortization of intangibles
            and other assets                              3.1          2.1
                                                      -------      -------
          Operating income                               18.6         57.3
                                                      -------      -------
          Other income (expenses):
            Investment income                             0.2          0.4
            Interest expense                             (4.5)        (1.6)
                                                      -------      -------
                                                         (4.3)        (1.2)
                                                      -------      -------
          Earnings before income taxes                   14.3         56.1

          Provision for income taxes                      6.2         22.5
                                                      -------      -------
          Net earnings                                $   8.1      $  33.6
                                                      =======      =======
          Earnings per common share                   $  0.10      $  0.36

          Dividends per common share                  $  0.08      $  0.08













<FN>
        See notes to unaudited consolidated condensed financial statements.
</TABLE>

<PAGE>
<PAGE>
<TABLE>
               NATIONAL HEALTH LABORATORIES INCORPORATED AND SUBSIDIARIES
                    CONSOLIDATED CONDENSED STATEMENTS OF CASH FLOWS
                                 (Dollars in Millions)
                                      (Unaudited)
<CAPTION>
                                                        Three Months Ended
                                                            March 31,     
                                                      --------------------
                                                        1994         1993 
                                                      -------      -------
          <S>                                         <C>          <C>       
          CASH FLOWS FROM OPERATING ACTIVITIES:
            Net earnings                              $   8.1      $  33.6

            Adjustments to reconcile net earnings
              to net cash provided by (used for)
              operating activities:
                Depreciation and amortization             9.4          8.8
                Provision for doubtful accounts, 
                  net                                    (0.9)        (0.5)
                Change in assets and liabilities, 
                  net of effects of acquisitions:
                  Increase in accounts receivable       (19.5)       (14.2)
                  Increase in prepaid expenses 
                    and other                            (4.8)        (0.7)
                  Decrease in deferred income 
                    taxes, net                            3.3         11.7
                  Decrease in income taxes 
                    receivable                            7.8         15.2
                  Increase in accounts payable,
                    accrued expenses and other            3.8         10.1
                  Payments for settlement and
                    related expenses                     (8.9)       (30.9)
                  Other, net                              4.1          0.1
                                                      -------      -------
                                                         (5.7)        (0.4)
                                                      -------      -------
            Net cash provided by operating
              activities                                  2.4         33.2
                                                      -------      -------
          CASH FLOWS FROM INVESTING ACTIVITIES:
            Capital expenditures                        (10.3)        (4.3)
            Acquisitions of businesses                  (13.5)          --
                                                      -------      -------
            Net cash used for investing
              activities                                (23.8)        (4.3)
                                                      -------      -------






                                        (continued)

<PAGE>
<PAGE>

               NATIONAL HEALTH LABORATORIES INCORPORATED AND SUBSIDIARIES
               CONSOLIDATED CONDENSED STATEMENTS OF CASH FLOWS, CONTINUED
                                 (Dollars in Millions)
                                      (Unaudited)
<CAPTION>
                                                        Three Months Ended
                                                            March 31,     
                                                      --------------------
                                                        1994         1993 
                                                      -------      ------- 
          <S>                                         <C>          <C>
          CASH FLOWS FROM FINANCING ACTIVITIES:
            Proceeds from revolving credit
              facilities                              $  46.0      $  25.0
            Deferred payments on acquisitions            (0.7)        (0.4)
            Purchase of treasury stock                     --        (26.0)
            Dividends paid on common stock               (6.8)        (7.6)
            Other                                          --         (0.7)
                                                      -------      -------
            Net cash provided by (used for)
              financing activities                       38.5         (9.7)
                                                      -------      -------
            Net increase in cash 
              and cash equivalents                       17.1         19.2
            Cash and cash equivalents at
              beginning of year                          12.3         33.4
                                                      -------      -------
            Cash and cash equivalents at
              end of period                           $  29.4      $  52.6
                                                      =======      =======
          Supplemental schedule of cash
            flow information:
              Cash paid during the period for:
                Interest                              $   3.6      $   1.3
                Income taxes                              0.2          0.2

          Disclosure of non-cash financing
            and investing activities:
              Dividends declared and unpaid
                on common stock                       $   6.8      $   7.4

          In connection with business
            acquisitions, liabilities were
            assumed as follows:
              Fair value of assets acquired           $  15.0      $    --
              Cash paid                                 (13.5)          --
                                                      -------      -------
              Liabilities assumed                     $   1.5      $    --
                                                      =======      =======








<FN>
        See notes to unaudited consolidated condensed financial statements.
</TABLE>
<PAGE>
<PAGE>

               NATIONAL HEALTH LABORATORIES INCORPORATED AND SUBSIDIARIES
             NOTES TO UNAUDITED CONSOLIDATED CONDENSED FINANCIAL STATEMENTS
                      (Dollars in Millions, except per share data)

          1.   BASIS OF FINANCIAL STATEMENT PRESENTATION

               The consolidated financial statements include  the accounts of
          National Health  Laboratories Incorporated (the "Company")  and its
          wholly-owned   subsidiaries  after  elimination   of  all  material
          intercompany accounts  and transactions.  Approximately  24% of the
          outstanding common stock of the Company is owned by National Health
          Care  Group,  Inc.  ("NHCG")  which  is  an  indirect  wholly-owned
          subsidiary of Mafco Holdings Inc. ("Mafco").

               The accompanying consolidated  condensed financial  statements
          of the Company and its subsidiaries are unaudited.   In the opinion
          of management, all adjustments (which include only normal recurring
          accruals)  necessary  for  a  fair  statement  of  the  results  of
          operations have been made.

          2.   EARNINGS PER SHARE

               Earnings per share are based upon the  weighted average number
          of  shares outstanding during the three months ended March 31, 1994
          and 1993 of 84,750,692  shares and 93,525,174 shares, respectively.
          The  change in the total number of shares outstanding resulted from
          the purchase by  the Company  of outstanding shares  of its  common
          stock, net of additional shares issued upon the exercise of options
          pursuant to the Company's stock option plan. 

          3.   DIVIDEND DECLARATION

               On March 11,  1994, the Company declared a  quarterly dividend
          in the aggregate  amount of $6.8 ($0.08 per  share), which was paid
          on April 26, 1994 to holders of record of common stock at the close
          of business on April 5, 1994.  Such dividend was paid entirely with
          cash  on  hand.   In  connection  with  the  acquisition and  stock
          repurchase program described in Note 4, the Company announced it is
          discontinuing dividend payments for the foreseeable future in order
          to increase its  flexibility with respect  to both its  acquisition
          strategy and stock repurchase program.

          4.   SUBSEQUENT EVENTS

               On  May  3,  1994,  the  Company  entered  into  a  definitive
          agreement to acquire Allied Clinical Laboratories, Inc. ("Allied").
          Pursuant to the agreement, a subsidiary of the Company commenced on
          May  9, 1994 a  cash tender offer  for all shares  of Allied common
          stock for $23 per share.  Any shares not tendered  and purchased in
          the offer  will be exchanged for $23 per share in cash in a second-
          step merger.

               The  tender offer  and  the merger  are  subject, among  other
          things, to the  purchase in  the offer of  4,836,000 Allied  common
          shares  and the expiration of  all waiting periods  under the Hart-
          Scott-Rodino Antitrust Improvements Act.

<PAGE>
<PAGE>

               NATIONAL HEALTH LABORATORIES INCORPORATED AND SUBSIDIARIES
             NOTES TO UNAUDITED CONSOLIDATED CONDENSED FINANCIAL STATEMENTS
                                 (Dollars in Millions)

          4.   SUBSEQUENT EVENTS - Continued

               Pursuant  to a commitment letter dated May 3, 1994 between the
          Company and Citibank, N.A.  ("Citibank"), Citibank has committed to
          provide (i) a  secured revolving  credit facility of  up to  $350.0
          (the "Revolving  Credit Facility")  and  (ii) a  secured term  loan
          facility of $400.0 (the "Term Facility") to finance the acquisition
          and merger of Allied, to refinance certain existing debt of Allied,
          to refinance certain existing  debt of the Company, to  pay related
          fees and expenses and for general corporate purposes of the Company
          and  its  subsidiaries,  in each  case  subject  to  the terms  and
          conditions set forth therein.

               The  Revolving  Credit  Facility  will  mature  on  the  fifth
          anniversary of the closing date with semi-annual reductions in  the
          availability  of $50.0  each  commencing three  and one-half  years
          after the closing date.  The Term Facility will mature six and one-
          half  years after the closing date, with repayments in each quarter
          prior to maturity based  on a specified amortization schedule.   It
          is expected that the  terms and conditions of the  Revolving Credit
          Facility  and   the  Term   Facility  will  contain,   among  other
          provisions,  requirements  for  maintaining  a   defined  level  of
          stockholders'   equity,  various   financial  ratios   and  certain
          restrictions on investments and acquisitions of assets.

               Additionally, the  Company announced, in  connection with  the
          acquisition of Allied, that the Company  will terminate its current
          10 million  share repurchase program, under  which 7,795,800 common
          shares  have been repurchased, and will establish a new $50.0 stock
          repurchase  program   through  which   the  Company  will   acquire
          additional shares of the  Company's common stock from time  to time
          in the open market.

               On  April 7,  1994,  the Company  entered  into an  additional
          revolving credit facility  (the "Additional Credit  Facility") with
          Citicorp  USA, Inc. as agent for a  group of banks.  The Additional
          Credit Facility provides that the Company may borrow up to $50.0 in
          addition  to  the amount  available  under  the existing  revolving
          credit facility.   The Additional Credit Facility matures on August
          1, 1994  and  is  unsecured.   The  terms  and  conditions  of  the
          Additional Credit Facility are substantially the same  as the terms
          and conditions of the existing revolving credit facility.  On April
          30,  1994, no amounts had been drawn  down on the Additional Credit
          Facility.







<PAGE>
<PAGE>

               NATIONAL HEALTH LABORATORIES INCORPORATED AND SUBSIDIARIES
                        MANAGEMENT'S DISCUSSION AND ANALYSIS OF
                     FINANCIAL CONDITION AND RESULTS OF OPERATIONS
                                 (Dollars in Millions)

          RESULTS OF OPERATIONS

               Net  sales  for the  three  months ended  March 31,  1994 were
          $185.0, a decrease of  7.4% from $199.8 reported in  the comparable
          1993 period.  Net sales increased by approximately 10% and 11% from
          growth in  new accounts and numerous acquisitions of small clinical
          laboratory companies,  respectively.   A reduction in  Medicare fee
          schedules from 88%  to 84%  of the national  limitation amounts  on
          January 1, 1994, plus changes in reimbursement policies  of various
          third party payors,  reduced net  sales by approximately  4%.   The
          impact   of  severe   weather  further   decreased  net   sales  by
          approximately 3.5% to 5%.  Other factors, including declines in the
          level of HDL and ferritin testing, price erosion in the industry as
          a  whole, a changing test  mix and lower  utilization of laboratory
          testing, comprised the remaining reduction in net sales.

               Cost of  sales primarily includes  laboratory and distribution
          costs, a  substantial portion of  which vary directly  with volume.
          Cost of sales increased to $132.3 in the first quarter of 1994 from
          $109.1  in  the  same quarter  of  1993.   Of  the  $23.2 increase,
          approximately $14.1  was the  result of  higher testing  volume and
          approximately $2.9 was due to an increase in phlebotomy staffing to
          improve client service and meet competitive demand.  The  remaining
          increase  resulted mainly  from higher  compensation and  insurance
          expenses.  Cost  of sales as a  percent of net sales  was 71.5% for
          the   three  months  ended  March   31,  1994  and   54.6%  in  the
          corresponding  1993  period.   The increase  in  the cost  of sales
          percentage primarily results from  a reduction in net sales  due to
          pricing  pressures  which  provides no  corresponding  reduction in
          operating costs.  

               Selling,  general and  administrative  expenses  decreased  to
          $31.0 for the  three months ended March 31, 1994  from $31.3 in the
          corresponding period in 1993.   This reduction was achieved despite
          higher labor costs, primarily  through decreased spending for legal
          and  other professional services and lower  expenses related to the
          relocation of Company personnel.

               The increase  in amortization of intangibles  and other assets
          to $3.1 in  the first quarter of 1994 from $2.1 in the same quarter
          of 1993  primarily resulted from the acquisition  of numerous small
          clinical laboratory  companies during the  second half of  1993 and
          the beginning of 1994.

               Interest expense was $4.5 for the three months ended March 31,
          1994  compared with $1.6 for the corresponding period in 1993.  The
          change resulted from increased borrowings used primarily to finance
          repurchases by the  Company of its common stock during  1993 and to
          finance the  acquisition of numerous laboratories  during both 1993
          and 1994.


<PAGE>
<PAGE>

               NATIONAL HEALTH LABORATORIES INCORPORATED AND SUBSIDIARIES
                        MANAGEMENT'S DISCUSSION AND ANALYSIS OF
                     FINANCIAL CONDITION AND RESULTS OF OPERATIONS
                      (Dollars in Millions, except per share data)

          RESULTS OF OPERATIONS - Continued

               The provision  for income  taxes as  a percentage  of earnings
          before income taxes was 43.4% and  40.1% for the three months ended
          March 31, 1994 and  1993, respectively.  The change was  mainly due
          to the  increase in U.S.  corporate tax rates during  1993 and also
          was the  result of  a higher effective  rate for  both federal  and
          state income taxes.

          FINANCIAL CONDITION, LIQUIDITY AND CAPITAL RESOURCES

               For  the three months ended March 31,  1994 and 1993, net cash
          provided by  operating activities (after payment  of settlement and
          related  expenses of $8.9 and $30.9 in 1994 and 1993, respectively)
          was  $2.4  and  $33.2,   respectively.    Cash  used  for   capital
          expenditures and acquisitions  of companies was $23.8  and $4.3 for
          the three months ended March 31, 1994 and 1993,  respectively.  The
          Company  expects total  capital  expenditures to  be  approximately
          $30.0 in 1994  to accommodate expected growth, to  further automate
          laboratory processes and improve efficiency.

               Net cash provided by operations has historically been adequate
          to  fund capital  expenditures and to  provide the  working capital
          necessary for the Company's ongoing operations and internal growth.
          During the three months ended  March 31, 1994, capital expenditures
          exceeded  net cash provided by operations which required the use of
          a portion  of the Company's  existing revolving credit  facility to
          finance its  growth activities.   However, the  Company anticipates
          that the aggregate net cash provided by operations for 1994 will be
          sufficient to satisfy the projected 1994 capital expenditures.

               The  Company  acquired four  clinical laboratories  during the
          three months ended March 31, 1994 for an  aggregate amount of $13.5
          in  cash and  the  recognition  of  $1.5  of  liabilities.    These
          laboratories,  on  an  annual   basis,  are  expected  to  generate
          approximately $11.4 in net sales.

               On  May  3,  1994,  the  Company  entered  into  a  definitive
          agreement  to  acquire  Allied.    Pursuant  to  the  agreement,  a
          subsidiary of the Company  commenced on May  9, 1994 a cash  tender
          offer for all shares of Allied common stock for $23 per share.  Any
          shares  not tendered and purchased  in the offer  will be exchanged
          for $23 per share in cash in a second-step merger.

               The  tender offer  and  the merger  are  subject, among  other
          things, to the  purchase in  the offer of  4,836,000 Allied  common
          shares  and the expiration of  all waiting periods  under the Hart-
          Scott-Rodino Antitrust Improvements Act.




<PAGE>
<PAGE>

               NATIONAL HEALTH LABORATORIES INCORPORATED AND SUBSIDIARIES
                        MANAGEMENT'S DISCUSSION AND ANALYSIS OF
                     FINANCIAL CONDITION AND RESULTS OF OPERATIONS
                      (Dollars in Millions, except per share data)

          FINANCIAL CONDITION, LIQUIDITY AND CAPITAL RESOURCES - Continued

               Pursuant  to a commitment letter dated May 3, 1994 between the
          Company and  Citibank,  Citibank has  committed  to provide  (i)  a
          secured  Revolving Credit  Facility  of up  to  $350.0 and  (ii)  a
          secured Term  Facility of  $400.0 to  finance  the acquisition  and
          merger  of Allied, to refinance certain existing debt of Allied, to
          refinance certain existing debt of the Company, to pay related fees
          and  expenses and for general corporate purposes of the Company and
          its  subsidiaries, in each case subject to the terms and conditions
          set forth therein.

               The  Revolving  Credit  Facility  will  mature  on  the  fifth
          anniversary of the closing date with semi-annual reductions in  the
          availability  of $50.0  each  commencing three  and one-half  years
          after the closing date.  The Term Facility will mature six and one-
          half  years after the closing date, with repayments in each quarter
          prior to maturity based  on a specified amortization schedule.   It
          is expected that the  terms and conditions of the  Revolving Credit
          Facility  and   the  Term   Facility  will  contain,   among  other
          provisions,  requirements  for  maintaining  a   defined  level  of
          stockholders'   equity,  various   financial  ratios   and  certain
          restrictions on investments and acquisitions of assets.

               Additionally, the  Company announced, in  connection with  the
          acquisition of Allied, that the Company  will terminate its current
          10 million  share repurchase program, under  which 7,795,800 common
          shares  have been repurchased, and will establish a new $50.0 stock
          repurchase  program   through  which   the  Company  will   acquire
          additional shares of the  Company's common stock from time  to time
          in the open market.

               On  April 7,  1994,  the Company  entered  into an  Additional
          Credit Facility with  Citicorp USA, Inc.  as agent for  a group  of
          banks.  The  Additional Credit Facility  provides that the  Company
          may borrow up  to $50.0 in addition  to the amount  available under
          the  existing revolving  credit  facility.   The Additional  Credit
          Facility matures on August 1, 1994 and is unsecured.  The terms and
          conditions of the Additional  Credit Facility are substantially the
          same as the terms  and conditions of the existing  revolving credit
          facility.  On April 30, 1994, no amounts had been drawn down on the
          Additional Credit Facility.

               On March 11, 1994,  the Company declared a  quarterly dividend
          in the  aggregate amount of $6.8 ($0.08  per share), which was paid
          on April 26, 1994 to holders of record of common stock at the close
          of business on April 5, 1994.  Such dividend was paid entirely with
          cash  on  hand.   In  connection  with  the  acquisition and  stock
          repurchase program described in Note 4, the  Company announced that
          it is discontinuing dividend payments for the foreseeable future in
          order  to  increase  its  flexibility  with  respect  to  both  its
          acquisition strategy and stock repurchase program.

<PAGE>
<PAGE>

               NATIONAL HEALTH LABORATORIES INCORPORATED AND SUBSIDIARIES
                      (Dollars in Millions, except per share data)

                              PART II - OTHER INFORMATION

          Item 1.   Legal Proceedings

                    In  September 1993,  as discussed  in the  Company's most
               recent annual report on Form 10-K, the Company was served with
               a  subpoena issued by  the Office of Inspector  General of the
               United  States Department  of Health  and Human  Services (the
               "OIG")   concerning   the   Company's   regulatory  compliance
               procedures.  The Company has provided documents to the OIG  in
               response to the  subpoena and continues to be in  contact with
               the OIG through its outside attorneys.

          Item 5.   Other Events

                    On  May 3,  1994, the  Company entered into  a definitive
               agreement to  acquire Allied.   Pursuant  to the  agreement, a
               subsidiary  of the  Company commenced  on May  9, 1994  a cash
               tender offer for all shares of Allied common stock for $23 per
               share.   Any shares not  tendered and purchased  in the  offer
               will  be exchanged for $23 per  share in cash in a second-step
               merger.

                    The tender offer and the merger are subject,  among other
               things,  to  the purchase  in  the offer  of 4,836,000  Allied
               common shares and the  expiration of all waiting periods under
               the Hart-Scott-Rodino Antitrust Improvement Act.

                    In furtherance of the  transaction, the Company announced
               that it  had entered into stock option agreements with Haywood
               D. Cochrane,  Jr.,  Allied's  President  and  Chief  Executive
               Officer, and  Warburg, Pincus Capital  Company, L.P., pursuant
               to  which the  Company has  the option  to purchase  from such
               stockholders an aggregate amount of 2,768,815 shares of Allied
               common stock at $23 per share.

                    The Company also  announced it is discontinuing  dividend
               payments for  the foreseeable future in order  to increase its
               flexibility with respect  to both its acquisition strategy and
               the Company's new $50.0 stock repurchase program through which
               the Company will acquire, from time to time, additional shares
               of its common stock on the open market.




<PAGE>
<PAGE>

               NATIONAL HEALTH LABORATORIES INCORPORATED AND SUBSIDIARIES

                              PART II - OTHER INFORMATION 

          Item 6.   Exhibits and Reports on Form 8-K

                    (a)  Exhibits

                             2  -   Agreement and Plan of Merger dated as  of
                                    May 3, 1994.

                            10  -   Revolving  Credit  Agreement dated  as of
                                    April  7,  1994  among   National  Health
                                    Laboratories  Incorporated  and  Citicorp
                                    USA, Inc.  

                            20  -   Press Release dated May 4, 1994

                         99(a)  -   Stock Option  Agreement dated  as of  May
                                    3, 1994,  among NHL, N  Acquisition Corp.
                                    and  Warburg,  Pincus   Capital  Company.
                                    L.P.

                         99(b)  -   Stock Option  Agreement dated  as of  May
                                    3, 1994, among  NHL, N Acquisition  Corp.
                                    and Haywood D. Cochrane, Jr.

                    (b)  Reports on Form 8-K

                               National   Health  Laboratories   Incorporated
                               filed  no  reports  on  Form  8-K  during  the
                               fiscal quarter ended March 31, 1994.


















<PAGE>
<PAGE>

                                   S I G N A T U R E 


               Pursuant to the requirements of the Securities Exchange Act of
          1934,  the registrant has  duly caused this report  to be signed on
          its behalf by the undersigned thereunto duly authorized.



                       NATIONAL HEALTH LABORATORIES INCORPORATED
                                       Registrant



                                             By:/s/  MICHAEL L. JEUB         
                                                     Michael L. Jeub         

                                             Executive Vice  President, Chief
                                             Financial Officer and Treasurer
                                             (Principal Accounting Officer)


          Date:       May 10, 1994





























<PAGE>
<PAGE>

                                   INDEX TO EXHIBITS


                                                             
          Exhibit No.                                               

             2          Agreement and Plan of Merger dated 
                        as of May 3, 1994.                                   
                               
             10         Revolving Credit Agreement dated as of
                        April 7,  1994 among  National  Health
                        Laboratories Incorporated and Citicorp
                        USA, Inc.

             20         Press Release dated May 4, 1994.

             99(a)      Stock Option Agreement dated as of
                        May 3, 1994, among NHL, N Acquisition 
                        Corp. and Warburg, Pincus Capital 
                        Company. L.P.

             99(b)      Stock Option Agreement dated as of 
                        May 3, 1994, among NHL, N Acquisition 
                        Corp. and Haywood D. Cochrane, Jr.
<PAGE>














 









                                                        EXHIBIT 2
                                                   CONFORMED COPY

















                     AGREEMENT AND PLAN OF MERGER



                       Dated as of May 3, 1994,


                                 Among


              NATIONAL HEALTH LABORATORIES INCORPORATED,



                          N ACQUISITION CORP.



                                  AND



                  ALLIED CLINICAL LABORATORIES, INC.
<PAGE>



                           TABLE OF CONTENTS

                                                             Page

     Parties and Recitals  . . . . . . . . . . . . . . .        1


                               ARTICLE I

                               The Offer

     SECTION 1.01.    The Offer . . . . . . . . . . . . . .      2
     SECTION 1.02.    Company Actions . . . . . . . . . . .      4


                              ARTICLE II

                              The Merger

     SECTION 2.01.    The Merger  . . . . . . . . . . . . .      6
     SECTION 2.02.    Closing . . . . . . . . . . . . . . .      6
     SECTION 2.03.    Effective Time  . . . . . . . . . . .      6
     SECTION 2.04.    Effects of the Merger . . . . . . . .      7
     SECTION 2.05.    Certificate of Incorporation and
                        By-laws . . . . . . . . . . . . . .      7
     SECTION 2.06.    Directors . . . . . . . . . . . . . .      7
     SECTION 2.07.    Officers  . . . . . . . . . . . . . .      7


                              ARTICLE III

           Effect of the Merger on the Capital Stock of the
          Constituent Corporations; Exchange of Certificates

     SECTION 3.01.    Effect on Capital Stock . . . . . . .      8
     SECTION 3.02.    Exchange of Certificates  . . . . . .      9

                              ARTICLE IV

                    Representations and Warranties

     SECTION 4.01.    Representations and Warranties of the
                        Company . . . . . . . . . . . . . .     11
     SECTION 4.02.    Representations and Warranties of 
                        Parent and Sub  . . . . . . . . . .     27
<PAGE>



                               ARTICLE V

               Covenants Relating to Conduct of Business

     SECTION 5.01.    Conduct of Business . . . . . . . . .     30
     SECTION 5.02.    No Solicitation . . . . . . . . . . .     33

                              ARTICLE VI

                         Additional Agreements

     SECTION 6.01.    Stockholder Approval; Preparation of
                        Proxy Statement . . . . . . . . . .     35
     SECTION 6.02.    Access to Information; Confidentiality    37 
     SECTION 6.03.    Best Efforts; Notification  . . . . .     37
     SECTION 6.04.    Stock Option Plans  . . . . . . . . .     39
     SECTION 6.05.    Benefit Plans and Employee Matters  .     40
     SECTION 6.06.    Indemnification, Exculpation and
                        Insurance . . . . . . . . . . . . .     41
     SECTION 6.07.    Directors . . . . . . . . . . . . . .     42
     SECTION 6.08.    Fees and Expenses . . . . . . . . . .     43
     SECTION 6.09.    Public Announcements  . . . . . . . .     44
     SECTION 6.10.    Stockholder Litigation  . . . . . . .     45
     SECTION 6.11.    Convertible Notes . . . . . . . . . .     45


                              ARTICLE VII

                         Conditions Precedent

     SECTION 7.01.    Conditions to Each Party's Obligation
                        to Effect the Merger  . . . . . . .     46


                             ARTICLE VIII

                   Termination, Amendment and Waiver

     SECTION 8.01.    Termination . . . . . . . . . . . . .     46
     SECTION 8.02.    Effect of Termination . . . . . . . .     47
     SECTION 8.03.    Amendment . . . . . . . . . . . . . .     48
     SECTION 8.04.    Extension; Waiver . . . . . . . . . .     48
     SECTION 8.05.    Procedure for Termination, Amendment,
                        Extension or Waiver . . . . . . . .     48
<PAGE>



                              ARTICLE IX

                          General Provisions

     SECTION 9.01.    Nonsurvival of Representations and
                        Warranties  . . . . . . . . . . . .     49
     SECTION 9.02.    Notices . . . . . . . . . . . . . . .     49
     SECTION 9.03.    Definitions . . . . . . . . . . . . .     50
     SECTION 9.04.    Interpretation  . . . . . . . . . . .     52
     SECTION 9.05.    Counterparts  . . . . . . . . . . . .     52
     SECTION 9.06.    Entire Agreement; No Third-Party
                        Beneficiaries . . . . . . . . . . .     53
     SECTION 9.07.    Governing Law . . . . . . . . . . . .     53     
     SECTION 9.08.    Assignment  . . . . . . . . . . . . .     53
     SECTION 9.09.    Enforcement . . . . . . . . . . . . .     53


     EXHIBITS

     EXHIBIT A        Conditions of the Offer <PAGE>
 



                                                   CONFORMED COPY



                    AGREEMENT AND PLAN OF MERGER dated as of May
               3, 1994, among NATIONAL HEALTH LABORATORIES
               INCORPORATED, a Delaware corporation ("Parent"),
               N ACQUISITION CORP., a Delaware corporation and a
               wholly owned subsidiary of Parent ("Sub"), and
               ALLIED CLINICAL LABORATORIES, INC., a Delaware
               corporation (the "Company").

          WHEREAS, in furtherance of the acquisition of the
     Company by Parent on the terms and subject to the conditions
     set forth in this Agreement, Parent proposes to cause Sub to
     make a tender offer (as it may be amended from time to time
     as permitted under this Agreement, the "Offer") to purchase
     all the issued and outstanding shares of Common Stock, par
     value $.01 per share, of the Company (the "Company Common
     Stock"), at a price per share of Company Common Stock of $23
     net to the seller in cash (such price, as may hereafter be
     increased, the "Offer Price"), upon the terms and subject to
     the conditions set forth in this Agreement, and the Board of
     Directors of the Company has approved the Offer and is
     recommending that the Company's stockholders accept the
     Offer;

          WHEREAS, the respective Boards of Directors of Parent,
     Sub and the Company have approved the Offer and the merger
     of Sub into the Company, as set forth below (the "Merger"),
     upon the terms and subject to the conditions set forth in
     this Agreement, whereby each issued and outstanding share of
     Company Common Stock, other than shares owned directly or
     indirectly by Parent or the Company and Dissenting Shares
     (as defined in Section 3.01(d)), will be converted into the
     right to receive the Offer Price; 

          WHEREAS, Parent, Sub and the Company desire to make
     certain representations, warranties, covenants and
     agreements in connection with the Offer and the Merger and
     also to prescribe various conditions to the Offer and the
     Merger; and

          WHEREAS, certain stockholders of the Company have each
     entered into a separate stock option agreement dated as of
     the date hereof with Parent and Sub (the "Option
     Agreements"), pursuant to which such stockholders are
     granting Sub the option to purchase up to an aggregate of
     2,768,815 shares of Company Common Stock upon the terms and
<PAGE>




     subject to the conditions set forth in the respective Option
     Agreements.


          NOW, THEREFORE, in consideration of the
     representations, warranties, covenants and agreements 
     contained in this Agreement, the parties agree as follows:


                          ARTICLE I

                          The Offer
          SECTION 1.01.  The Offer.  (a)  Subject to the
     provisions of this Agreement, as promptly as practicable,
     but in no event later than May 10, 1994, Sub shall, and
     Parent shall cause Sub to, commence the Offer.  The
     obligation of Sub to, and of Parent to cause Sub to,
     commence the Offer and accept for payment, and pay for, any
     shares of Company Common Stock tendered pursuant to the
     Offer shall be subject to the conditions set forth in
     Exhibit A (any of which may be waived by Sub in its sole
     discretion, provided that, without the consent of the
     Company, Sub shall not waive the Minimum Tender Condition
     (as defined in Exhibit A)) and to the terms and conditions
     of this Agreement.  Sub expressly reserves the right to
     modify the terms of the Offer, except that, without the
     consent of the Company (such consent to be authorized by the
     Board of Directors of the Company), Sub shall not (i) reduce
     the number of shares of Company Common Stock subject to the
     Offer, (ii) reduce the Offer Price, (iii) add to the
     conditions set forth in Exhibit A, (iv) except as provided
     in the next sentence, extend the Offer, (v) change the form
     of consideration payable in the Offer or (vi) otherwise
     amend the Offer in any manner adverse to the Company's
     stockholders.  Notwithstanding the foregoing, Sub may,
     without the consent of the Company, but subject to the
     Company's right to terminate this Agreement pursuant to
     Section 8.01(b)(i)(y), (A) extend the Offer, if at the
     scheduled expiration date of the Offer any of the conditions
     to Sub's obligation to accept for payment, and pay for,
     shares of Company Common Stock shall not be satisfied or
     waived, until such time as such conditions are satisfied or
     waived, (B) extend the Offer for any period required by any
     rule, regulation, interpretation or position of the
     Securities and Exchange Commission (the "SEC") or the staff
     thereof applicable to the Offer and (C) extend the Offer for
     any reason on one or more occasions for an aggregate period
<PAGE>




     of not more than five business days beyond the latest
     expiration date that would otherwise be permitted under
     clause (A) or (B) of this sentence.  Subject to the terms
     and conditions of the Offer and this Agreement, Sub shall,
     and Parent shall cause Sub to, accept for payment, and pay
     for, all shares of Company Common Stock validly tendered and
     not withdrawn pursuant to the Offer that Sub becomes
     obligated to accept for payment, and pay for, pursuant to
     the Offer as soon as practicable after the expiration of the
     Offer.

          (b)  On the date of commencement of the Offer, Parent
     and Sub shall file with the SEC a Tender Offer Statement on
     Schedule 14D-1 with respect to the Offer, which shall
     contain an offer to purchase and a related letter of
     transmittal and summary advertisement (such Schedule 14D-1
     and the documents included therein pursuant to which the
     Offer will be made, together with any supplements or
     amendments thereto, the "Offer Documents").  Parent and Sub
     agree that the Offer Documents shall comply as to form in
     all material respects with the Securities Exchange Act of
     1934, as amended (the "Exchange Act"), and the rules and
     regulations promulgated thereunder and the Offer Documents,
     on the date first published, sent or given to the Company's
     stockholders, shall not contain any untrue statement of a
     material fact or omit to state any material fact required to
     be stated therein or necessary in order to make the
     statements therein, in light of the circumstances under
     which they were made, not misleading, except that no
     representation is made by Parent or Sub with respect to
     information supplied by the Company specifically for
     inclusion in the Offer Documents.  Each of Parent, Sub and
     the Company agrees promptly to correct any information
     provided by it for use in the Offer Documents if and to the
     extent that such information shall have become false or
     misleading in any material respect, and each of Parent and
     Sub further agrees to take all steps necessary to amend or
     supplement the Offer Documents and to cause the Offer
     Documents as so amended or supplemented to be filed with the
     SEC and to be disseminated to the Company's stockholders, in
     each case as and to the extent required by applicable
     Federal securities laws.  The Company and its counsel shall
     be given a reasonable opportunity to review the Offer
     Documents and all amendments and supplements thereto prior
     to their filing with the SEC or dissemination to
     stockholders of the Company.  Parent and Sub agree to
     provide the Company and its counsel any comments Parent, Sub
     or their counsel may receive from the SEC or its staff with
<PAGE>




     respect to the Offer Documents promptly after the receipt of
     such comments.

          (c)  Parent shall provide or cause to be provided to
     Sub on a timely basis the funds necessary to accept for
     payment, and pay for, any shares of Company Common Stock
     that Sub becomes obligated to accept for payment, and pay
     for, pursuant to the Offer.

          SECTION 1.02.  Company Actions.  (a)  The Company
     hereby approves of and consents to the Offer and represents
     that the Board of Directors of the Company, at a meeting
     duly called and held, duly and unanimously adopted
     resolutions approving this Agreement, the Offer and the
     Merger, determining that the terms of the Offer and the
     Merger are fair to, and in the best interests of, the
     Company's stockholders and recommending that the Company's
     stockholders accept the Offer and tender their shares
     pursuant to the Offer and approve and adopt this Agreement. 
     The Company represents that its Board of Directors has
     received the opinion of Alex. Brown & Sons Incorporated that
     the proposed consideration to be received by the holders of
     shares of Company Common Stock pursuant to the Offer and the
     Merger is fair to such holders from a financial point of
     view, and a complete and correct signed copy of such opinion
     has been delivered by the Company to Parent.  The Company
     has been advised by each of its directors and executive
     officers that each such person intends to tender all shares
     of Company Common Stock owned by such person pursuant to the
     Offer.

          (b)  On the date the Offer Documents are filed with the
     SEC, the Company shall file with the SEC a Solicitation/
     Recommendation Statement on Schedule 14D-9 with respect to
     the Offer (such Schedule 14D-9, as amended from time to
     time, the "Schedule 14D-9") containing the recommendation
     described in paragraph (a) and shall mail the Schedule 14D-9
     to the stockholders of the Company.  The Company agrees that
     the Schedule 14D-9 shall comply as to form in all material
     respects with the requirements of the Exchange Act and the
     rules and regulations promulgated thereunder and, on the
     date filed with the SEC and on the date first published,
     sent or given to the Company's stockholders, shall not
     contain any untrue statement of a material fact or omit to
     state any material fact required to be stated therein or
     necessary in order to make the statements therein, in light
     of the circumstances under which they were made, not
     misleading, except that no representation is made by the
<PAGE>




     Company with respect to information supplied by Parent or
     Sub specifically for inclusion in the Schedule 14D-9.  Each
     of the Company, Parent and Sub agrees promptly to correct
     any information provided by it for use in the Schedule 14D-9
     if and to the extent that such information shall have become
     false or misleading in any material respect, and the Company
     further agrees to take all steps necessary to amend or
     supplement the Schedule 14D-9 and to cause the
     Schedule 14D-9 as so amended or supplemented to be filed
     with the SEC and disseminated to the Company's stockholders,
     in each case as and to the extent required by applicable
     Federal securities laws.  Parent and its counsel shall be 
     given a reasonable opportunity to review the Schedule 14D-9
     and all amendments and supplements thereto prior to their
     filing with the SEC or dissemination to stockholders of the
     Company.  The Company agrees to provide Parent and its
     counsel in writing with any comments the Company or its
     counsel may receive from the SEC or its staff with respect
     to the Schedule 14D-9 promptly after the receipt of such
     comments.

          (c)  In connection with the Offer, the Company shall
     cause its transfer agent to furnish Sub promptly with
     mailing labels containing the names and addresses of the
     record holders of Company Common Stock as of a recent date
     and of those persons becoming record holders subsequent to
     such date, together with copies of all lists of
     stockholders, security position listings and computer files
     and all other information in the Company's possession or
     control regarding the beneficial owners of Company Common
     Stock, and shall furnish to Sub such information and
     assistance (including updated lists of stockholders,
     security position listings and computer files) as Parent may
     reasonably request in communicating the Offer to the
     Company's stockholders.  Subject to the requirements of
     applicable law, and except for such steps as are necessary
     to disseminate the Offer Documents and any other documents
     necessary to consummate the Merger, Parent and Sub and their
     agents shall hold in confidence the information contained in
     any such labels, listings and files, will use such
     information only in connection with the Offer and the Merger
     and, if this Agreement shall be terminated, will, upon
     request, deliver, and will use their best efforts to cause
     their agents to deliver, to the Company all copies of such
     information then in their possession or control.
<PAGE>




                              ARTICLE II

                              The Merger

          SECTION 2.01.  The Merger.  Upon the terms and subject
     to the conditions set forth in this Agreement, and in
     accordance with the Delaware General Corporation Law (the
     "DGCL"), Sub shall be merged with and into the Company at
     the Effective Time (as defined in Section 2.03).  Following
     the Effective Time, the separate corporate existence of Sub
     shall cease and the Company shall continue as the surviving
     corporation (the "Surviving Corporation") and shall succeed 
     to and assume all the rights and obligations of Sub in
     accordance with the DGCL.  Notwithstanding the foregoing,
     Parent may elect at any time prior to the Merger, instead of
     merging Sub into the Company as provided above, to merge the
     Company with and into Sub; provided, however, that the
     Company shall not be deemed to have breached any of its
     representations, warranties, covenants or agreements set
     forth in this Agreement solely by reason of such election. 
     In such event, the parties agree to execute an appropriate
     amendment to this Agreement in order to reflect the
     foregoing and, where appropriate, to provide that Sub shall
     be the Surviving Corporation and will continue under the
     name "Allied Clinical Laboratories, Inc.".  At the election
     of Parent, any direct or indirect subsidiary (as defined in
     Section 9.03) of Parent may be substituted for Sub as a
     constituent corporation in the Merger.  In such event, the
     parties agree to execute an appropriate amendment to this
     Agreement in order to reflect the foregoing.

          SECTION 2.02.  Closing.  The closing of the Merger will
     take place at 10:00 a.m. on a date to be specified by the
     parties, which shall be no later than the second business
     day after satisfaction or waiver of the conditions set forth
     in Article VII (the "Closing Date"), at the offices of
     Cravath, Swaine & Moore, Worldwide Plaza, 825 Eighth Avenue,
     New York, New York 10019, unless another date or place is
     agreed to in writing by the parties hereto.

          SECTION 2.03.  Effective Time.  Subject to the
     provisions of this Agreement, as soon as practicable on or
     after the Closing Date, the parties shall file a certificate
     of merger or other appropriate documents (in any such case,
     the "Certificate of Merger") executed in accordance with the
     relevant provisions of the DGCL and shall make all other
     filings or recordings required under the DGCL.  The Merger
     shall become effective at such time as the Certificate of
<PAGE>




     Merger is duly filed with the Delaware Secretary of State,
     or at such other time as Sub and the Company shall agree
     should be specified in the Certificate of Merger (the time
     the Merger becomes effective being hereinafter referred to
     as the "Effective Time").

          SECTION 2.04.  Effects of the Merger.  The Merger shall
     have the effects set forth in Section 259 of the DGCL.

          SECTION 2.05.  Certificate of Incorporation and
     By-laws.  (a)  The certificate of incorporation of the
     Company, as in effect immediately prior to the Effective 
     Time, shall be amended as of the Effective Time so that
     Article FOUR of such certificate of incorporation reads in
     its entirety as follows:  "The total number of shares of all
     classes of stock which the corporation shall have authority
     to issue is 100 shares of Common Stock, par value $1.00 per
     share." and Article FIVE of such certificate of
     incorporation is deleted in its entirety and, as so amended,
     such certificate of incorporation shall be the certificate
     of incorporation of the Surviving Corporation until
     thereafter changed or amended as provided therein or by
     applicable law.

          (b)  The by-laws of the Company as in effect at the
     Effective Time shall be the by-laws of the Surviving
     Corporation, until thereafter changed or amended as provided
     therein or by applicable law.

          SECTION 2.06.  Directors.  The directors of Sub
     immediately prior to the Effective Time shall be the
     directors of the Surviving Corporation, until the earlier of
     their resignation or removal or until their respective
     successors are duly elected and qualified, as the case may
     be.

          SECTION 2.07.  Officers.  The officers of the Company
     immediately prior to the Effective Time shall be the
     officers of the Surviving Corporation, until the earlier of
     their resignation or removal or until their respective
     successors are duly elected and qualified, as the case may
     be.
<PAGE>




                              ARTICLE III

           Effect of the Merger on the Capital Stock of the 
          Constituent Corporations; Exchange of Certificates

          SECTION 3.01.  Effect on Capital Stock.  As of the
     Effective Time, by virtue of the Merger and without any
     action on the part of the holder of any shares of Company
     Common Stock or any shares of capital stock of Sub:

          (a)  Capital Stock of Sub.  Each issued and outstanding
       share of capital stock of Sub shall be converted into and 
       become one fully paid and nonassessable share of Common
       Stock, par value $1.00 per share, of the Surviving
       Corporation.

          (b)  Cancellation of Treasury Stock and Parent Owned
       Stock.  Each share of Company Common Stock that is owned
       by the Company or by any subsidiary of the Company and
       each share of Company Common Stock that is owned by
       Parent, Sub or any other subsidiary of Parent  shall
       automatically be cancelled and retired and shall cease to
       exist, and no consideration shall be delivered in exchange
       therefor.

          (c)  Conversion of Company Common Stock.  Subject to
       Section 3.01(d), each issued and outstanding share of
       Company Common Stock (other than shares to be cancelled in
       accordance with Section 3.01(b)) shall be converted into
       the right to receive from the Surviving Corporation in
       cash, without interest, the Offer Price (the "Merger
       Consideration").  As of the Effective Time, all such
       shares of Company Common Stock shall no longer be
       outstanding and shall automatically be cancelled and
       retired and shall cease to exist, and each holder of a
       certificate representing any such shares of Company Common
       Stock shall cease to have any rights with respect thereto,
       except the right to receive the Merger Consideration,
       without interest.

          (d)  Shares of Dissenting Stockholders. 
       Notwithstanding anything in this Agreement to the
       contrary, any issued and outstanding shares of Company
       Common Stock held by a person (a "Dissenting Stockholder")
       who objects to the Merger and complies with all the
       provisions of Delaware law concerning the right of holders
       of Company Common Stock to dissent from the Merger and
       require appraisal of their shares of Company Common Stock
<PAGE>




     ("Dissenting Shares") shall not be converted as described in
     Section 3.01(c) but shall become the right to receive such
     consideration as may be determined to be due to such
     Dissenting Stockholder pursuant to the laws of the State of
     Delaware.  If, after the Effective Time, such Dissenting
     Stockholder withdraws his demand for appraisal or fails to
     perfect or otherwise loses his right of appraisal, in any
     case pursuant to the DGCL, his shares of Company Common
     Stock shall be deemed to be converted as of the Effective
     Time into the right to receive the Merger Consideration. 
     The Company shall give Parent (i) prompt notice of any
     demands for appraisal of shares of Company Common Stock 
     received by the Company and (ii) the opportunity to
     participate in and direct all negotiations and proceedings
     with respect to any such demands.  The Company shall not,
     without the prior written consent of Parent, make any
     payment with respect to, or settle, offer to settle or
     otherwise negotiate, any such demands.

          SECTION 3.02.  Exchange of Certificates.  (a)  Paying
     Agent.  Prior to the Effective Time, Parent shall select a
     bank or trust company to act as paying agent (the "Paying
     Agent") for the payment of the Merger Consideration upon
     surrender of certificates representing Company Common Stock.

          (b)  Parent To Provide Funds.  Parent shall take all
     steps necessary to enable and cause the Surviving
     Corporation to provide to the Paying Agent on a timely
     basis, as and when needed after the Effective Time, funds
     necessary to pay for the shares of Company Common Stock as
     part of the Merger pursuant to Section 3.01.

          (c)  Exchange Procedure.  As soon as reasonably
     practicable after the Effective Time, the Paying Agent shall
     mail to each holder of record of a certificate or
     certificates which immediately prior to the Effective Time
     represented outstanding shares of Company Common Stock (the
     "Certificates") whose shares were converted into the right
     to receive the Merger Consideration pursuant to
     Section 3.01, (i) a letter of transmittal (which shall
     specify that delivery shall be effected, and risk of loss
     and title to the Certificates shall pass, only upon delivery
     of the Certificates to the Paying Agent and shall be in a
     form and have such other provisions as Parent may reasonably
     specify) and (ii) instructions for use in effecting the
<PAGE>




     surrender of the Certificates in exchange for the Merger
     Consideration.  Upon surrender of a Certificate for
     cancellation to the Paying Agent or to such other agent or
     agents as may be appointed by Parent, together with such
     letter of transmittal, duly executed, and such other
     documents as may reasonably be required by the Paying Agent,
     the holder of such Certificate shall be entitled to receive
     in exchange therefor the amount of cash into which the
     shares of Company Common Stock theretofore represented by
     such Certificate shall have been converted pursuant to
     Section 3.01, and the Certificate so surrendered shall
     forthwith be cancelled.  In the event of a transfer of 
     ownership of Company Common Stock which is not registered in
     the transfer records of the Company, payment may be made to
     a person other than the person in whose name the Certificate
     so surrendered is registered, if such Certificate shall be
     properly endorsed or otherwise be in proper form for
     transfer and the person requesting such payment shall pay
     any transfer or other taxes required by reason of the
     payment to a person other than the registered holder of such
     Certificate or establish to the satisfaction of the
     Surviving Corporation that such tax has been paid or is not
     applicable.  Until surrendered as contemplated by this
     Section 3.02, each Certificate shall be deemed at any time
     after the Effective Time to represent only the right to
     receive upon such surrender the amount of cash, without
     interest, into which the shares of Company Common Stock
     theretofore represented by such Certificate shall have been
     converted pursuant to Section 3.01.  No interest will be
     paid or will accrue on the cash payable upon the surrender
     of any Certificate.

          (d)  No Further Ownership Rights in Company Common
     Stock.  All cash paid upon the surrender of Certificates in
     accordance with the terms of this Article III shall be
     deemed to have been paid in full satisfaction of all rights
     pertaining to the shares of Company Common Stock theretofore
     represented by such Certificates, and there shall be no
     further registration of transfers on the stock transfer
     books of the Surviving Corporation of the shares of Company
     Common Stock which were outstanding immediately prior to the
     Effective Time.  If, after the Effective Time, Certificates
     are presented to the Surviving Corporation or the Paying
     Agent for any reason, they shall be cancelled and exchanged
     as provided in this Article III.

          (e)  No Liability.  None of Parent, Sub, the Company or
     the Paying Agent shall be liable to any person in 
<PAGE>




     respect of any cash delivered to a public official pursuant
     to any applicable abandoned property, escheat or similar
     law.  If any Certificates shall not have been surrendered
     prior to seven years after the Effective Time (or
     immediately prior to such earlier date on which any payment
     pursuant to this Article III would otherwise escheat to or
     become the property of any Governmental Entity (as defined
     in Section 4.01(d))), the cash payment in respect of such
     Certificate shall, to the extent permitted by applicable
     law, become the property of the Surviving Corporation, free
     and clear of all claims or interests of any person
     previously entitled thereto.

                              ARTICLE IV

                    Representations and Warranties

          SECTION 4.01.  Representations and Warranties of the
     Company.  Except as set forth on the Disclosure Schedule
     delivered by the Company to Parent prior to the execution of
     this Agreement (the "Company Disclosure Schedule"), the
     Company represents and warrants to Parent and Sub as
     follows:

          (a)  Organization, Standing and Corporate Power.  Each
       of the Company and each of its subsidiaries is a
       corporation or partnership duly organized, validly
       existing and in good standing under the laws of the
       jurisdiction in which it is organized and has the
       requisite corporate or partnership power and authority to
       carry on its business as now being conducted.  Each of the
       Company and each of its subsidiaries is duly qualified or
       licensed to do business and is in good standing in each
       jurisdiction in which the nature of its business or the
       ownership or leasing of its properties makes such
       qualification or licensing necessary, other than in such
       jurisdictions where the failure to be so qualified or
       licensed individually or in the aggregate would not have a
       material adverse effect on the Company.  The Company has
       delivered to Parent complete and correct copies of its
       certificate of incorporation and by-laws and the
       certificates of incorporation and by-laws or other
       organizational documents of its Significant Subsidiaries,
       in each case as amended to the date of this Agreement. 
       For purposes of this Agreement, a "Significant Subsidiary"
       means any subsidiary of the Company that constitutes a
<PAGE>




       significant subsidiary within the meaning of Rule 1-02 of
       Regulation S-X of the SEC.

          (b)  Subsidiaries.  The Company Disclosure
       Schedule lists each subsidiary of the Company.  All the
       outstanding shares of capital stock of each such
       subsidiary have been validly issued and are fully paid and
       nonassessable and are owned by the Company, by another
       subsidiary of the Company or by the Company and another
       such subsidiary, free and clear of all pledges, claims,
       liens, charges, encumbrances and security interests of any
       kind or nature whatsoever (collectively, "Liens").  Except 
       for the capital stock of its subsidiaries, the Company
       does not own, directly or indirectly, any capital stock or
       other ownership interest in any corporation, partnership,
       joint venture or other entity.

          (c)  Capital Structure.  The authorized capital stock
       of the Company consists of 20,000,000 shares of Company
       Common Stock and 10,000,000 shares of preferred stock, par
       value $.01 per share ("Company Preferred Stock").  At the
       close of business on May 2, 1994, (i) 8,398,916 shares of
       Company Common Stock and no shares of Company Preferred
       Stock were issued and outstanding, (ii) no shares of
       Company Common Stock were held by the Company in its
       treasury, (iii) 508,719 shares of Company Common Stock
       were reserved for issuance upon exercise of outstanding
       Employee Stock Options (as defined in Section 6.04) and
       (iv) 761,904 shares of Company Common Stock were reserved
       for issuance upon conversion of the Company's 7.375%
       Convertible Senior Subordinated Notes due December 15,
       2006 (the "Convertible Notes").  At the close of business
       on May 1, 1994, there was $24,000,000 aggregate principal
       amount outstanding of the Convertible Notes, which are
       convertible into shares of Company Common Stock at the
       option of the holder thereof at an exchange price of
       $31.50 per share of Company Common Stock.  Except as set
       forth above, at the close of business on May 1, 1994, no
       shares of capital stock or other voting securities of the
       Company were issued, reserved for issuance or outstanding. 
       There are no outstanding stock appreciation rights which
       were not granted in tandem with a related Employee Stock
       Option.  All outstanding shares of capital stock of the
       Company are, and all shares which may be issued will be,
<PAGE>




       when issued, duly authorized, validly issued, fully paid
       and nonassessable and not subject to preemptive rights. 
       There are no bonds, debentures, notes or other
       indebtedness of the Company having the right to vote (or,
       except for the Convertible Notes, convertible into, or
       exchangeable for, securities having the right to vote) on
       any matters on which stockholders of the Company may vote. 
       Except as set forth above, as of the date of this
       Agreement, there are no outstanding securities, options,
       warrants, calls, rights, commitments, agreements,
       arrangements or undertakings of any kind to which the
       Company or any of its subsidiaries is a party or by which 
       any of them is bound obligating the Company or any of its
       subsidiaries to issue, deliver or sell, or cause to be
       issued, delivered or sold, additional shares of capital
       stock or other voting securities of the Company or of any
       of its subsidiaries or obligating the Company or any of
       its subsidiaries to issue, grant, extend or enter into any
       such security, option, warrant, call, right, commitment,
       agreement, arrangement or undertaking.  As of the date of
       this Agreement, there are not any outstanding contractual
       obligations (i) of the Company or any of its subsidiaries
       to repurchase, redeem or otherwise acquire any shares of
       capital stock of the Company or any of its subsidiaries or
       (ii) of the Company to vote or to dispose of any shares of
       the capital stock of any of its subsidiaries.

          (d)  Authority; Noncontravention.  The Company has the
       requisite corporate power and authority to enter into this
       Agreement and, subject to, if required by law, approval of
       the Merger by an affirmative vote of the holders of a
       majority of the outstanding shares of Company Common Stock
       (the "Company Stockholder Approval"), to consummate the
       transactions contemplated by this Agreement.  The
       execution and delivery of this Agreement by the Company
       and the consummation by the Company of the transactions
       contemplated by this Agreement have been duly authorized
       by all necessary corporate action on the part of the
       Company, subject to the Company Stockholder Approval, if
       such approval is required by law.  This Agreement has been
       duly executed and delivered by the Company and constitutes
       a valid and binding obligation of the Company, enforceable
       against the Company in accordance with its terms.  The
       execution and delivery of this Agreement do not, and the
       consummation of the transactions contemplated by this
<PAGE>




       Agreement and compliance with the provisions of this
       Agreement will not, conflict with, or result in any
       violation of, or default (with or without notice or lapse
       of time or both) under, or give rise to a right of
       termination, cancellation or acceleration of any
       obligation or to loss of a material benefit under, or
       result in the creation of any Lien upon any of the
       properties or assets of the Company or any of its
       subsidiaries under, (i) the certificate of incorporation
       or by-laws of the Company or the comparable charter or
       organizational documents of any of its subsidiaries,
       (ii) any loan or credit agreement, note, bond, mortgage, 
       indenture, lease or other agreement, instrument, permit,
       concession, franchise or license applicable to the Company
       or any of its subsidiaries or their respective properties
       or assets or (iii) subject to the governmental filings and
       other matters referred to in the following sentence, any
       judgment, order, decree, statute, law, ordinance, rule or
       regulation applicable to the Company or any of its
       subsidiaries or their respective properties or assets,
       other than, in the case of clause (ii) or (iii), any such
       conflicts, violations, defaults, rights or Liens that
       individually or in the aggregate would not (x) have a
       material adverse effect on the Company, (y) impair the
       ability of the Company to perform its obligations under
       this Agreement or (z) prevent the consummation of any of
       the transactions contemplated by this Agreement.  No
       consent, approval, order or authorization of, or
       registration, declaration or filing with, any Federal,
       state or local government or any court, administrative or
       regulatory agency or commission or other governmental
       authority or agency, domestic or foreign (a "Governmental
       Entity"), is required by or with respect to the Company or
       any of its subsidiaries in connection with the execution
       and delivery of this Agreement by the Company or the
       consummation by the Company of the transactions
       contemplated by this Agreement, except for (1) the filing
       of a premerger notification and report form by the Company
       under the Hart-Scott-Rodino Antitrust Improvements Act of
       1976 (the "HSR Act"), (2) the filing with the SEC of
       (A) the Schedule 14D-9, (B) a proxy statement relating to
       the Company Stockholder Approval, if such approval is
       required by law (as amended or supplemented from time to
       time, the "Proxy Statement"), and (C) such reports under
       Section 13(a) of the Exchange Act as may be required in
       connection with this Agreement and the
<PAGE>




     transactions contemplated by this Agreement, (3) the filing
     of the Certificate of Merger with the Delaware Secretary of
     State and appropriate documents with the relevant
     authorities of other states in which the Company is
     qualified to do business and (4) such other consents,
     approvals, orders, authorizations, registrations,
     declarations and filings as would not individually or in the
     aggregate (A) have a material adverse effect on the Company,
     (B) impair the ability of the Company to perform its
     obligations under this Agreement or (C) prevent the
     consummation of any of the transactions contemplated by this
     Agreement.  
          (e)  SEC Documents; Financial Statements.  The Company
       has filed all required reports, schedules, forms,
       statements and other documents with the SEC since
       January 1, 1993 (the "SEC Documents").  As of their
       respective dates, the SEC Documents complied in all
       material respects with the requirements of the Securities
       Act of 1933, as amended (the "Securities Act"), or the
       Exchange Act, as the case may be, and the rules and
       regulations of the SEC promulgated thereunder applicable
       to such SEC Documents, and none of the SEC Documents
       contained any untrue statement of a material fact or
       omitted to state a material fact required to be stated
       therein or necessary in order to make the statements
       therein, in light of the circumstances under which they
       were made, not misleading.  Except to the extent that
       information contained in any SEC Document has been revised
       or superseded by a later Filed SEC Document (as defined in
       Section 4.01(g)), none of the SEC Documents contains any
       untrue statement of a material fact or omits to state any
       material fact required to be stated therein or necessary
       in order to make the statements therein, in light of the
       circumstances under which they were made, not misleading. 
       The financial statements of the Company included in the
       SEC Documents comply as to form in all material respects
       with applicable accounting requirements and the published
       rules and regulations of the SEC with respect thereto,
       have been prepared in accordance with generally accepted
       accounting principles (except, in the case of unaudited
       statements, as permitted by Form 10-Q of the SEC) applied
       on a consistent basis during the periods involved (except
       as may be indicated in the notes thereto) and fairly
<PAGE>




       present the consolidated financial position of the Company
       and its consolidated subsidiaries as of the dates thereof
       and the consolidated results of their operations and cash
       flows for the periods then ended (subject, in the case of
       unaudited statements, to normal year-end audit
       adjustments).  Except as set forth in the Filed SEC
       Documents and except for liabilities and obligations
       incurred in the ordinary course of business consistent
       with past practice since the date of the most recent
       consolidated balance sheet included in the Filed SEC
       Documents, neither the Company nor any of its subsidiaries
       has any liabilities or obligations of any nature (whether 
       accrued, absolute, contingent or otherwise) required by
       generally accepted accounting principles to be set forth
       on a consolidated balance sheet of the Company and its
       consolidated subsidiaries or in the notes thereto.

          (f)  Information Supplied.  None of the information
       supplied or to be supplied by the Company specifically for
       inclusion or incorporation by reference in (i) the Offer
       Documents, (ii) the Schedule 14D-9, (iii) the information
       to be filed by the Company in connection with the Offer
       pursuant to Rule 14f-1 promulgated under the Exchange Act
       (the "Information Statement") or (iv) the Proxy Statement,
       will, in the case of the Offer Documents, the
       Schedule 14D-9 and the Information Statement, at the
       respective times the Offer Documents, the Schedule 14D-9
       and the Information Statement are filed with the SEC or
       first published, sent or given to the Company's
       stockholders, or, in the case of the Proxy Statement, at
       the time the Proxy Statement is first mailed to the
       Company's stockholders or at the time of the Stockholders
       Meeting (as defined in Section 6.01(a)), contain any
       untrue statement of a material fact or omit to state any
       material fact required to be stated therein or necessary
       in order to make the statements therein, in light of the
       circumstances under which they are made, not misleading. 
       The Schedule 14D-9, the Information Statement and the
       Proxy Statement will comply as to form in all material
       respects with the requirements of the Exchange Act and the
       rules and regulations thereunder, except that no
       representation or warranty is made by the Company with
       respect to statements made or incorporated by reference
<PAGE>




       therein based on information supplied by Parent or Sub
       specifically for inclusion or incorporation by reference
       therein. 

          (g)  Absence of Certain Changes or Events.  Except as
       disclosed in the SEC Documents filed and publicly
       available prior to the date of this Agreement (the "Filed
       SEC Documents"), since the date of the most recently
       audited financial statements included in the Filed SEC
       Documents, the Company has conducted its business only in
       the ordinary course, and there has not been (i) any
       material adverse change in the Company, (ii) any 
       declaration, setting aside or payment of any dividend or
       other distribution (whether in cash, stock or property)
       with respect to any of the Company's capital stock,
       (iii) any split, combination or reclassification of any of
       its capital stock or any issuance or the authorization of
       any issuance of any other securities in respect of, in
       lieu of or in substitution for shares of its capital
       stock, (iv)(x) any granting by the Company or any of its
       subsidiaries to any executive officer of the Company or
       any of its subsidiaries of any increase in compensation,
       except in the ordinary course of business consistent with
       prior practice or as was required under employment
       agreements in effect as of the date of the most recent
       audited financial statements included in the Filed SEC
       Documents, (y) any granting by the Company or any of its
       subsidiaries to any such executive officer of any increase
       in severance or termination pay, except as was required
       under any employment, severance or termination agreements
       in effect as of the date of the most recent audited
       financial statements included in the Filed SEC Documents,
       or (z) any entry by the Company or any of its subsidiaries
       into any employment, severance or termination agreement
       with any such executive officer, (v) any damage,
       destruction or loss, whether or not covered by insurance,
       that has or could reasonably be expected to have a
       material adverse effect on the Company or (vi) any change
       in accounting methods, principles or practices by the
       Company materially affecting its assets, liabilities or
       business, except insofar as may have been required by a
       change in generally accepted accounting principles.

          (h)  Litigation.  Except as disclosed in the Filed SEC
       Documents, as of the date of this Agreement, there is no
<PAGE>




       suit, action or proceeding pending or, to the knowledge of
       the Company, threatened against the Company or any of its
       subsidiaries that individually or in the aggregate could
       reasonably be expected to (i) have a material adverse
       effect on the Company, (ii) impair the ability of the
       Company to perform its obligations under this Agreement or
       (iii) prevent the consummation of any of the transactions
       contemplated by this Agreement, nor is there any judgment,
       decree, injunction, rule or order of any Governmental
       Entity or arbitrator outstanding against the Company or
       any of its subsidiaries having, or which is reasonably
       likely to have, any effect referred to in the foregoing 
       clause (i), (ii) or (iii) above.

          (i)  Absence of Changes in Benefit Plans.  Except as
       disclosed in the Filed SEC Documents, since the date of
       the most recent audited financial statements included in
       the Filed SEC Documents, there has not been any adoption
       or amendment in any material respect by the Company or any
       of its subsidiaries of any collective bargaining agreement
       or any bonus, pension, profit sharing, deferred
       compensation, incentive compensation, stock ownership,
       stock purchase, stock option, phantom stock, retirement,
       vacation, severance, disability, death benefit,
       hospitalization, medical or other plan, arrangement or
       understanding (whether or not legally binding) providing
       benefits to any current or former employee, officer or
       director of the Company or any of its subsidiaries. 
       Except as disclosed in the Filed SEC Documents, there
       exist no employment, consulting, severance, termination or
       indemnification agreements, arrangements or understandings
       between the Company or any of its subsidiaries and any
       current or former employee, officer or director of the
       Company or any of its subsidiaries.

          (j)  ERISA Compliance.  (i)  The Company Disclosure
       Schedule contains a list and brief description of each
       "employee pension benefit plan" (as defined in
       Section 3(2) of the Employee Retirement Income Security
       Act of 1974, as amended ("ERISA")) (sometimes referred to
       herein as a "Pension Plan"), each "employee welfare
       benefit plan" (as defined in Section 3(1) of ERISA) and
       each stock option, stock purchase, deferred compensation
       plan or arrangement and each other employee fringe benefit
       plan (as defined in Section 6039D(d) of the Code)
       maintained, contributed to or required to be maintained or
<PAGE>




       contributed to by the Company, any of its subsidiaries or
       any other person or entity that, together with the
       Company, is treated as a single employer under
       Section 414(b), (c), (m) or (o) of the Internal Revenue
       Code of 1986, as amended (the "Code"), (each, a "Commonly
       Controlled Entity"), for the benefit of any current or
       former employees, officers, directors or independent
       contractors of the Company or any of its subsidiaries
       (collectively, "Benefit Plans").  The Company has
       delivered to Parent true, complete and correct copies of
       (w) each Benefit Plan (or, in the case of any unwritten
       Benefit Plans, descriptions thereof), (x) the most recent 
       annual report on Form 5500 filed with the Internal Revenue
       Service with respect to each Benefit Plan (if any such
       report was required), (y) the most recent summary plan
       description for each Benefit Plan for which such summary
       plan description is required and (z) each currently
       effective trust agreement and insurance or group annuity
       contract relating to any Benefit Plan.

           (ii)  Each Benefit Plan has been administered in all
       material respects in accordance with its terms.  The
       Company, its subsidiaries and all the Benefit Plans are
       all in compliance in all material respects with the
       applicable provisions of ERISA and the Code.  

          (iii)  All Pension Plans intended to be qualified under
       Section 401(a) of the Code have been the subject of
       determination letters from the Internal Revenue Service to
       the effect that such Pension Plans are qualified and
       exempt from Federal income taxes under Section 401(a) and
       501(a), respectively, of the Code and no such
       determination letter has been revoked nor, to the
       knowledge of the Company, has revocation been threatened,
       nor has any such Pension Plan been amended since the date
       of its most recent determination letter or application
       therefor in any respect that would adversely affect its
       qualification or materially increase its costs.

           (iv)  No Pension Plan that the Company or any of its
       subsidiaries maintains, or to which the Company or any of
       its subsidiaries is obligated to contribute, other than
       any Pension Plan that is a "multiemployer plan" (as such
       term is defined in Section 4001(a)(3) of ERISA;
       collectively, the "Multiemployer Pension Plans"), had, as
<PAGE>




       of the respective last annual valuation date for each such
       Pension Plan, an "unfunded benefit liability" (as such
       term is defined in Section 4001(a)(18) of ERISA), based on
       actuarial assumptions which have been furnished to Parent
       and neither the Company nor any of its subsidiaries is
       aware of any facts or circumstances that would materially
       change the funded status of any such Benefit Plans.  None
       of the Pension Plans has an "accumulated funding
       deficiency" (as such term is defined in Section 302 of
       ERISA or Section 412 of the Code), and there has been no
       application for a waiver of the minimum funding standards
       imposed by Section 412 of the Code with respect to any 
       Benefit Plan that is a Pension Plan.  

          (v)  None of the Company, any of its subsidiaries, any
       officer of the Company or any of its subsidiaries or any
       of the Benefit Plans which are subject to ERISA, including
       the Pension Plans, any trusts created thereunder or any
       trustee or administrator thereof, has engaged in a non-
       exempt "prohibited transaction" (as such term is defined
       in Section 406 of ERISA or Section 4975 of the Code) or
       any other breach of fiduciary responsibility that could
       subject the Company, any of its subsidiaries or any
       officer of the Company or any of its subsidiaries to tax
       or penalty under ERISA, the Code or other applicable law
       that has not been corrected or that individually or in the
       aggregate would have a material adverse effect on the
       Company (determined assuming that the tax under
       Section 4975(b) of the Code is imposed with respect to
       such prohibited transaction).  Any taxes or penalties
       arising from prohibited transactions that have been
       corrected have been paid in full.  Neither any of such
       Benefit Plans nor any of such trusts that is subject to
       Title IV of ERISA has been terminated, nor has there been
       any "reportable event" (as that term is defined in
       Section 4043 of ERISA) with respect thereto, during the
       last five years.  

           (vi)  Neither the Company nor any Commonly Controlled
       Entity has suffered or otherwise caused a "complete
       withdrawal" or a "partial withdrawal" (as such terms are
       defined in Section 4203 and Section 4205, respectively, of
       ERISA) with respect to any of the Multiemployer Pension
       Plans that could lead to the imposition of any withdrawal
       liability under Section 4201 of ERISA; and no action has
<PAGE>




       been taken that alone or with the passage of time could
       result in either a partial or complete withdrawal by any
       Commonly Controlled Entity in respect of any such plan.

          (vii)  With respect to any Benefit Plan that is an
       employee welfare benefit plan, except as disclosed in the
       Company Disclosure Schedule, (x) no such Benefit Plan is
       funded through a "welfare benefit fund", as such term is
       defined in Section 419(e) of the Code, (y) each such
       Benefit Plan that is a "group health plan", as such term
       is defined in Section 5000(b)(1) of the Code, complies in
       all material respects with the applicable requirements of 
       Section 4980B(f) of the Code and (z) each such Benefit
       Plan (including any such Plan covering retirees or other
       former employees) may be amended or terminated without
       material liability to the Company or any of its
       subsidiaries on or at any time after the consummation of
       the Offer.

         (viii)  No Commonly Controlled Entity has incurred any
       material liability to a Pension Plan (other than for
       contributions not yet due).  

          (k)  Taxes.  (i)  Each of the Company and each of its
       subsidiaries has filed all tax returns and reports
       required to be filed by it.  All such returns and reports
       are complete and correct in all material respects.  Each
       of the Company and each of its subsidiaries has paid (or
       the Company has paid on its behalf) all taxes shown as due
       on such returns and all material taxes for which no return
       was required to be filed, and the most recent financial
       statements contained in the Filed SEC Documents properly
       reflect in accordance with generally accepted accounting
       principles all taxes payable by the Company and its
       subsidiaries for all taxable periods and portions thereof
       through the date of such financial statements.

           (ii)  No deficiencies for any taxes have been
       proposed, asserted or assessed against the Company or any
       of its subsidiaries that are not properly reflected in
       accordance with generally accepted accounting principles
       in the most recent financial statements contained in the
       Filed SEC Documents, except for deficiencies that
       individually or in the aggregate would not have a material
       adverse effect on the Company, and no requests for waivers
       of the time to assess any such taxes are pending.  The
<PAGE>




       Company has not agreed with any tax authority to extend
       the time to assess any such taxes beyond the date of this
       Agreement.  The Federal income tax returns of the Company
       and each of its subsidiaries consolidated in such returns
       have been examined by the Internal Revenue Service for all
       years through 1991 and such examination is not ongoing. 
       The Company has not entered into any closing agreement
       with respect to any taxable year.

          (iii)  As used in this Agreement, "taxes" shall include
       all Federal, state, local and foreign income, property,
       sales, excise and other taxes, tariffs or duties of any 
       nature whatsoever.

          (l)  No Excess Parachute Payments; Section 162(m) of
       the Code.  (i)  Any amount that could be received (whether
       in cash or property or the vesting of property) as a
       result of any of the transactions contemplated by this
       Agreement by any employee, officer or director of the
       Company or any of its affiliates who is a "disqualified
       individual" (as such term is defined in proposed Treasury
       Regulation Section 1.280G-1) under any employment,
       severance or termination agreement, other compensation
       arrangement or Benefit Plan currently in effect would not
       be characterized as an "excess parachute payment" (as such
       term is defined in Section 280G(b)(1) of the Code).  

          
         (ii)  The disallowance of a deduction under
       Section 162(m) of the Code for employee remuneration will
       not apply to any amount paid or payable by the Company or
       any subsidiary of the Company under any contract, plan,
       program, arrangement or understanding.

          (m)  Compliance with Applicable Laws.  (i)  Each of the
       Company and each of its subsidiaries has in effect all
       Federal, state, local and foreign governmental approvals,
       authorizations, certificates, filings, franchises,
       licenses, notices, permits and rights ("Permits")
       necessary for it to own, lease or operate its properties
       and assets and to carry on its business as now conducted,
       and there has occurred no default under any such Permit,
       except for the lack of Permits and for defaults under
       Permits which lack or default individually or in the
       aggregate would not have a material adverse effect on the
       Company.  Except as disclosed in the Filed SEC Documents,
       the Company and its subsidiaries are in compliance with
<PAGE>




       all applicable statutes, laws, ordinances, rules, orders
       and regulations of any Governmental Entity, except for
       noncompliance which individually or in the aggregate would
       not have a material adverse effect on the Company.

           (ii)  To the best knowledge of the Company, each of
       the Company and its subsidiaries is, and has been, and
       each of the Company's former subsidiaries, while
       subsidiaries of the Company, was in compliance with all
       applicable Environmental Laws, except for noncompliance
       which individually or in the aggregate would not have a
       material adverse effect on the Company.  The term 
       "Environmental Laws" means any Federal, state or local
       statute, code, ordinance, rule, regulation, policy,
       guideline, permit, consent, approval, license, judgment,
       order, writ, decree, directive, injunction or other
       authorization, including the requirement to register
       underground storage tanks, relating to:  (A) Releases (as
       defined below) or threatened Releases of Hazardous
       Material (as defined below) into the environment,
       including into ambient air, soil, sediments, land surface
       or subsurface, buildings or facilities, surface water,
       groundwater, publicly-owned treatment works, septic
       systems or land; or (B) the generation, treatment,
       storage, disposal, use, handling, manufacturing,
       transportation or shipment of Hazardous Material.

          (iii)  During the period of ownership or operation by
       the Company and its subsidiaries of any of their
       respective current or previously owned or leased
       properties, there have been no Releases of Hazardous
       Material in, on, under or affecting such properties or, to
       the knowledge of the Company, any surrounding site, and
       none of the Company or its subsidiaries have disposed of
       any Hazardous Material or any other substance in a manner
       that could reasonably be anticipated to lead to a Release,
       except in each case for those which individually or in the
       aggregate would not have a material adverse effect on the
       Company.  Prior to the period of ownership or operation by
       the Company and its subsidiaries of any of their
       respective current or previously owned or leased
       properties, to the knowledge of the Company, no Hazardous
       Material was generated, treated, stored, disposed of,
       used, handled or manufactured at, or transported, shipped
       or disposed of from, such current or previously owned
<PAGE>




       properties, and there were no Releases of Hazardous
       Material in, on, under or affecting any such property or
       any surrounding site, except in each case for those which
       individually or in the aggregate would not have a material
       adverse effect on the Company.  The term "Release" has the
       meaning set forth in 42 U.S.C. section 9601(22).  The term
       "Hazardous Material" means (1) hazardous materials,
       pollutants, contaminants, constituents, medical or
       infectious wastes, hazardous wastes and hazardous
       substances as those terms are defined in the following
       statutes and their implementing regulations:  the
       Hazardous Materials Transportation Act, 49 U.S.C. 
       section 1801 et seq., the Resource Conservation and
       Recovery Act, 42 U.S.C. section 6901 et seq., the
       Comprehensive Environmental Response, Compensation and
       Liability Act, as amended by the Superfund Amendments and
       Reauthorization Act, 42 U.S.C. section 9601 et seq., the
       Clean Water Act, 33 U.S.C. section 1251 et seq., the Toxic
       Substances Control Act, 15 U.S.C. section 2601 et seq. and
       the Clean Air Act, 42 U.S.C. section 7401 et seq.,
       (2) petroleum, including crude oil and any fractions
       thereof, (3) natural gas, synthetic gas and any mixtures
       thereof, (4) asbestos and/or asbestos-containing material,
       (5) radon and (6) PCBs, or materials or fluids containing
       PCBs.

          (n)  State Takeover Statutes.  The Board of Directors
       of the Company has approved the Offer, the Merger, this
       Agreement and the Option Agreements and such approval is
       sufficient to render inapplicable to the Offer, the
       Merger, this Agreement and the Option Agreements and the
       transactions contemplated by this Agreement and the Option
       Agreements the provisions of Section 203 of the DGCL and
       the provisions of the Tennessee Investor Protection Act. 
       To the best of the Company's knowledge, no other state
       takeover statute or similar statute or regulation applies
       or purports to apply to the Offer, the Merger, this
       Agreement, the Option Agreements or any of the
       transactions contemplated by this Agreement and the Option
       Agreements.

          (o)  Brokers; Schedule of Fees and Expenses.  No
       broker, investment banker, financial advisor or other
       person, other than Alex. Brown & Sons Incorporated, the
       fees and expenses of which will be paid by the Company, is
       entitled to any broker's, finder's, financial advisor's or
<PAGE>




       other similar fee or commission in connection with the
       transactions contemplated by this Agreement based upon
       arrangements made by or on behalf of the Company.  The
       estimated fees and expenses incurred and to be incurred by
       the Company in connection with this Agreement and the
       transactions contemplated by this Agreement (including the
       fees of the Company's legal counsel) are set forth in the
       Company Disclosure Schedule.

          (p)  Opinion of Financial Advisor.  The Company has
       received the opinion of Alex. Brown & Sons Incorporated,
       dated the date of this Agreement, to the effect that, as 
       of such date, the consideration to be received in the
       Offer and the Merger by the Company's stockholders is fair
       to the Company's stockholders from a financial point of
       view, and a signed copy of such opinion has been delivered
       to Parent.

          (q)  Contracts; Debt Instruments.  (i)  Except as
       disclosed in the Filed SEC Documents, there is no contract
       or agreement that is material to the business, condition
       (financial or otherwise), results of operations or
       prospects of the Company and its subsidiaries taken as a
       whole.  Neither the Company nor any of its subsidiaries is
       in violation of or in default under (nor does there exist
       any condition which upon the passage of time or the giving
       of notice would cause such a violation of or default
       under) any loan or credit agreement, note, bond, mortgage,
       indenture, lease, permit, concession, franchise, license
       or any other contract, agreement, arrangement or
       understanding to which it is a party or by which it or any
       of its properties or assets is bound, except for
       violations or defaults that individually or in the
       aggregate would not have a material adverse effect on the
       Company.  

          (ii)  Set forth on the Company Disclosure Schedule is
       (x) a list of all loan or credit agreements, notes, bonds,
       mortgages, indentures and other agreements and instruments
       pursuant to which any indebtedness of the Company or any
       of its subsidiaries in an aggregate principal amount in
       excess of $250,000 is outstanding or may be incurred and
       (y) the respective principal amounts currently outstanding
       thereunder.  For purposes of this Agreement,
       "indebtedness" shall mean, with respect to any person,
<PAGE>




       without duplication, (A) all obligations of such person
       for borrowed money, or with respect to deposits or
       advances of any kind to such person, (B) all obligations
       of such person evidenced by bonds, debentures, notes or
       similar instruments, (C) all obligations of such person
       upon which interest charges are customarily paid, (D) all
       obligations of such person under conditional sale or other
       title retention agreements relating to property purchased
       by such person, (E) all obligations of such person issued
       or assumed as the deferred purchase price of property or
       services (excluding obligations of such person to
       creditors for raw materials, inventory, services and 
       supplies incurred in the ordinary course of such person's
       business), (F) all capitalized lease obligations of such
       person, (G) all obligations of others secured by any lien
       on property or assets owned or acquired by such person,
       whether or not the obligations secured thereby have been
       assumed, (H) all obligations of such person under interest
       rate or currency hedging transactions (valued at the
       termination value thereof), (I) all letters of credit
       issued for the account of such person (excluding letters
       of credit issued for the benefit of suppliers to support
       accounts payable to suppliers incurred in the ordinary
       course of business) and (J) all guarantees and
       arrangements having the economic effect of a guarantee of
       such person of any indebtedness of any other person.

          (r)  Title to Properties.  (i)  Each of the Company and
       each of its subsidiaries has good and marketable title to,
       or valid leasehold interests in, all its material
       properties and assets except for such as are no longer
       used or useful in the conduct of its businesses or as have
       been disposed of in the ordinary course of business and
       except for defects in title, easements, restrictive
       covenants and similar encumbrances or impediments that
       individually or in the aggregate would not materially
       interfere with its ability to conduct its business as
       currently conducted.  All such material properties and
       assets, other than properties and assets in which the
       Company or any of its subsidiaries has leasehold
       interests, are free and clear of all Liens, except for
       Liens that individually or in the aggregate would not
       materially interfere with the ability of the Company and
       its subsidiaries to conduct business as currently
       conducted.

           (ii)  Each of the Company and each of its subsidiaries
       has complied in all material respects with 
<PAGE>




       the terms of all material leases to which it is a party
       and under which it is in occupancy, and all such leases
       are in full force and effect.  Each of the Company and
       each of its subsidiaries enjoys peaceful and undisturbed
       possession under all such material leases.

          (s)  Labor Matters.  There are no collective bargaining
       or other labor union agreements to which the Company or
       any of its subsidiaries is a party or by which any of them
       is bound.  To the best knowledge of the Company, since
       December 1, 1992, neither the Company nor any of its
       subsidiaries has encountered any labor union organizing 
       activity, or had any actual or threatened employee
       strikes, work stoppages, slowdowns or lockouts.

          SECTION 4.02.  Representations and Warranties of Parent
     and Sub.  Parent and Sub represent and warrant to the
     Company as follows:

          (a)  Organization, Standing and Corporate Power.  Each
       of Parent, Sub and each of Parent's other subsidiaries is
       a corporation duly organized, validly existing and in good
       standing under the laws of the jurisdiction in which it is
       incorporated and has the requisite corporate power and
       authority to carry on its business as now being conducted. 
       Each of Parent, Sub and each of Parent's other
       subsidiaries is duly qualified or licensed to do business
       and is in good standing in each jurisdiction in which the
       nature of its business or the ownership or leasing of its
       properties makes such qualification or licensing
       necessary, other than in such jurisdictions where the
       failure to be so qualified or licensed individually or in
       the aggregate would not have a material adverse effect on
       Parent.  Parent has delivered to the Company complete and
       correct copies of its certificate of incorporation and
       by-laws and the certificate of incorporation and by-laws
       of Sub, in each case as amended to the date of this
       Agreement.

          (b)  Authority; Noncontravention.  Parent and Sub have
       all requisite corporate power and authority to enter into
       this Agreement and to consummate the transactions
       contemplated by this Agreement.  The execution and
       delivery of this Agreement by Parent and Sub and the
       consummation by Parent and Sub of the transactions
       contemplated by this Agreement have been duly authorized
       by all necessary corporate action on the part of Parent
       and Sub.  This Agreement has been duly executed and
       delivered by Parent and Sub and constitutes a valid and
       binding obligation of each such party, enforceable against
       each such party in accordance with its terms.  The
       execution and delivery of this Agreement do not, and the
       consummation of the transactions contemplated by this
<PAGE>




       Agreement and compliance with the provisions of this
       Agreement will not, conflict with, or result in any
       violation of, or default (with or without notice or lapse
       of time or both) under, or give rise to a right of
       termination, cancellation or acceleration of any
       obligation or loss of a material benefit under, or result
       in the creation of any Lien upon any of the properties or
       assets of Parent or any of its subsidiaries under, (i) the
       certificate of incorporation or by-laws of Parent or Sub
       or the comparable charter or organizational documents of
       any other subsidiary of Parent, (ii) any loan or credit
       agreement, note, bond, mortgage, indenture, lease or other 
       agreement, instrument, permit, concession, franchise or
       license applicable to Parent, Sub or any of Parent's other
       subsidiaries or their respective properties or assets or
       (iii) subject to the governmental filings and other
       matters referred to in the following sentence, any
       judgment, order, decree, statute, law, ordinance, rule or
       regulation applicable to Parent, Sub or any of Parent's
       other subsidiaries or their respective properties or
       assets, other than, in the case of clause (ii) or (iii),
       any such conflicts, violations, defaults, rights or Liens
       that individually or in the aggregate would not (x) have a
       material adverse effect on Parent, (y) impair the ability
       of Parent and Sub to perform their respective obligations
       under this Agreement or (z) prevent the consummation of
       any of the transactions contemplated by this Agreement. 
       No consent, approval, order or authorization of, or
       registration, declaration or filing with, any Governmental
       Entity is required by or with respect to Parent, Sub or
       any of Parent's other subsidiaries in connection with the
       execution and delivery of this Agreement or the
       consummation by Parent or Sub, as the case may be, of any
       of the transactions contemplated by this Agreement, except
       for (1) the filing of a premerger notification and report
       form under the HSR Act, (2) the filing with the SEC of
       (A) the Offer Documents and (B) such reports under
       Sections 13(a), 13(d) and 16(a) of the Exchange Act as 
<PAGE>




       may be required in connection with this Agreement and the
       transactions contemplated by this Agreement, (3) the
       filing of the Certificate of Merger with the Delaware
       Secretary of State and appropriate documents with the
       relevant authorities of other states in which the Company
       is qualified to do business and (4) such other consents,
       approvals, orders, authorizations, registrations,
       declarations and filings as would not individually or in
       the aggregate (A) have a material adverse effect on
       Parent, (B) impair the ability of Parent and Sub to
       perform their respective obligations under this Agreement
       or (C) prevent the consummation of any of the transactions 
       contemplated by this Agreement.  Neither Parent nor any of
       its affiliates or associates (as such term is defined in
       Section 203 of the DGCL) was, immediately prior to the
       execution and delivery of the Option Agreements, an
       Interested Stockholder (as such term is defined in
       Section 203 of the DGCL) of the Company.

          (c)  Information Supplied.  None of the information
       supplied or to be supplied by Parent or Sub specifically
       for inclusion or incorporation by reference in the Offer
       Documents, the Schedule 14D-9, the Information Statement
       or the Proxy Statement will, in the case of the Offer
       Documents, the Schedule 14D-9 and the Information
       Statement, at the respective times the Offer Documents,
       the Schedule 14D-9 and the Information Statement are filed
       with the SEC or first published, sent or given to the
       Company's stockholders, or, in the case of the Proxy
       Statement, at the date the Proxy Statement is first mailed
       to the Company's stockholders or at the time of the
       Stockholders Meeting, contain any untrue statement of a
       material fact or omit to state any material fact required
       to be stated therein or necessary in order to make the
       statements therein, in light of the circumstances under
       which they are made, not misleading.  The Offer Documents
       will comply as to form in all material respects with the
       requirements of the Exchange Act and the rules and
       regulations promulgated thereunder, except that no
       representation or warranty is made by Parent or Sub with
       respect to statements made or incorporated by reference
       therein based on information supplied by the Company
       specifically for inclusion or incorporation by reference
       therein.
<PAGE>




          (d)  Brokers.  No broker, investment banker, financial
       advisor or other person, other than Morgan Stanley & Co.
       Incorporated, the fees and expenses of which will be paid
       by Parent, is entitled to any broker's, finder's,
       financial advisor's or other similar fee or commission in
       connection with the transactions contemplated by this
       Agreement based upon arrangements made by or on behalf of
       Parent or Sub.

          (e)  Financing.  Parent and Sub have obtained bank
       commitments for funds sufficient to consummate the Offer
       and the Merger on the terms contemplated by this 
       Agreement, and at the expiration of the Offer and the
       Effective Time, Parent and Sub will have available all the
       funds necessary for the acquisition of all shares of
       Common Stock pursuant to the Offer and to perform their
       respective obligations under this Agreement.

          (f) Litigation.  Except as disclosed in documents filed
       with the SEC by Parent, as of the date of this Agreement,
       there is no suit, action or proceeding pending or, to the
       knowledge of Parent, threatened against Parent or any of
       its subsidiaries that individually or in the aggregate
       could reasonably be expected to (i) impair the ability of
       Parent or Sub to perform their obligations under this
       Agreement or (ii) prevent the consummation of any of the
       transactions contemplated by this Agreement, nor is there
       any judgment, decree, injunction, rule or order of any
       Governmental Entity or arbitrator outstanding against
       Parent or any of its subsidiaries having, or which is
       reasonably likely to have, any effect referred to in the
       foregoing clause (i) or (ii) above.


                               ARTICLE V

               Covenants Relating to Conduct of Business

          SECTION 5.01.  Conduct of Business.  (a)  Conduct of
     Business by the Company.  Until such time as Parent's
     designees shall constitute a majority of the members of the
     Board of Directors of the Company, the Company shall, and
     shall cause its subsidiaries to, carry on their respective
     businesses in the ordinary course and use all reasonable
     efforts to preserve intact their current business
     organizations, keep available the services of their current
     officers and employees and preserve their relationships with
<PAGE>




     customers, suppliers and others having business dealings
     with them.  Without limiting the generality of the
     foregoing, until such time as Parent's designees shall
     constitute a majority of the members of the Board of
     Directors of the Company, the Company shall not, and shall
     not permit any of its subsidiaries to:

          (i) (x) declare, set aside or pay any dividends on, or
       make any other distributions in respect of, any of its
       capital stock, other than dividends and distributions by
       any direct or indirect wholly owned subsidiary of the
       Company to its parent, in the case of less than wholly 
       owned subsidiaries, as required by agreements existing on
       the date of this Agreement, (y) split, combine or
       reclassify any of its capital stock or issue or authorize
       the issuance of any other securities in respect of, in
       lieu of or in substitution for shares of its capital stock
       or (z) purchase, redeem or otherwise acquire any shares of
       capital stock of the Company or any of its subsidiaries or
       any other securities thereof or any rights, warrants or
       options to acquire any such shares or other securities,
       other than any purchase of the Convertible Notes in
       accordance with Section 2.3 of the Note Agreement dated as
       of December 1, 1991 (the "Note Agreement");

           (ii) issue, deliver, sell, pledge or otherwise
       encumber any shares of its capital stock, any other voting
       securities or any securities convertible into, or any
       rights, warrants or options to acquire, any such shares,
       voting securities or convertible securities (other than
       (x) the issuance of Company Common Stock upon the exercise
       of Employee Stock Options outstanding on the date of this
       Agreement and in accordance with their present terms and
       (y) the issuance of Company Common Stock upon conversion
       of the outstanding Convertible Notes by the holders
       thereof in accordance with their present terms);

          
        (iii) amend its certificate of incorporation, by-laws or
       other comparable charter or organizational documents;

          
         (iv) acquire or agree to acquire (x) by merging or
       consolidating with, or by purchasing a substantial portion
       of the assets of, or by any other manner, any business or
       any corporation, partnership, joint venture, association
<PAGE>




       or other business organization or division thereof or
       (y) any assets that individually or in the aggregate are
       material to the Company and its subsidiaries taken as a
       whole, except purchases of inventory in the ordinary
       course of business consistent with past practice;

          (v) sell, lease, license, mortgage or otherwise
       encumber or subject to any Lien or otherwise dispose of
       any of its properties or assets, except for sales of its
       properties or assets in the ordinary course of business
       consistent with past practice;
          
         (vi) (x) incur any indebtedness for borrowed money or
       guarantee any such indebtedness of another person, issue
       or sell any debt securities or warrants or other rights to
       acquire any debt securities of the Company or any of its
       subsidiaries, guarantee any debt securities of another
       person, enter into any "keep well" or other agreement to
       maintain any financial statement condition of another
       person or enter into any arrangement having the economic
       effect of any of the foregoing or (y) make any loans,
       advances or capital contributions to, or investments in,
       any other person, other than to the Company or any direct
       or indirect wholly owned subsidiary of the Company;

          
        (vii) make or agree to make any new capital expenditure
       or expenditures which individually is in excess of
       $150,000 or which in the aggregate are in excess of
       $1,000,000;

          
       (viii) make any tax election or settle or compromise any
       income tax liability;

          
         (ix) pay, discharge, settle or satisfy any claims,
       liabilities or obligations (absolute, accrued, asserted or
       unasserted, contingent or otherwise), other than the
       payment, discharge, settlement or satisfaction, in the
       ordinary course of business consistent with past practice
       or in accordance with their terms, of liabilities
       reflected or reserved against in, or contemplated by, the
       most recent consolidated financial statements (or the
       notes thereto) of the Company included in the Filed SEC
       Documents or incurred since the date of such financial
       statements in the ordinary course of business consistent
       with past practice; 
<PAGE>




          (x) except in the ordinary course of business, modify,
       amend or terminate any material contract or agreement to
       which the Company or any subsidiary is a party or waive,
       release or assign any material rights or claims
       thereunder; or

                    (xi) authorize any of, or commit or agree to take any
       of, the foregoing actions.

          (b)  Other Actions.  The Company and Parent shall not,
     and shall not permit any of their respective subsidiaries
     to, take any action that would, or that could reasonably be 
     expected to, result in (i) any of the representations and
     warranties of such party set forth in this Agreement that
     are qualified as to materiality becoming untrue, (ii) any of
     such representations and warranties that are not so
     qualified becoming untrue in any material respect or
     (iii) any of the conditions to the Offer set forth in
     Exhibit A or any of the conditions to the Merger not being
     satisfied (subject to the Company's right to take action
     consistent with Section 5.02).

          SECTION 5.02.  No Solicitation.  (a)  The Company shall
     not, nor shall it permit any of its subsidiaries to, nor
     shall it authorize or permit any officer, director or
     employee of, or any investment banker, attorney or other
     advisor or representative of, the Company or any of its
     subsidiaries to, directly or indirectly, (i) solicit,
     initiate or encourage the submission of any takeover
     proposal or (ii) participate in any discussions or
     negotiations regarding, or furnish to any person any
     information with respect to, or take any other action to
     facilitate any inquiries or the making of any proposal that
     constitutes, or may reasonably be expected to lead to, any
     takeover proposal; provided, however, that prior to the
     acceptance for payment of shares of Company Common Stock
     pursuant to the Offer, to the extent required by the
     fiduciary obligations of the Board of Directors of the
     Company, as determined in good faith by the Board of
     Directors based on the advice of outside counsel, the
     Company may, (A) in response to an unsolicited request
     therefor, furnish information with respect to the Company to
     any person pursuant to a customary confidentiality agreement
     (as determined by the Company's outside counsel) and discuss
     (1) such information (but not the terms of any possible
     takeover proposal) and (2) the terms of this Section 5.02
     with such person and (B) upon receipt by the Company of a
     takeover proposal, following delivery to Parent of the
<PAGE>




     notice required pursuant to Section 5.02(c), participate in
     negotiations regarding such takeover proposal.  Without
     limiting the foregoing, it is understood that any violation
     of the restrictions set forth in the preceding sentence by
     any officer, director or employee of the Company or any of
     its subsidiaries or any investment banker, attorney or other
     advisor or representative of the Company or any of its
     subsidiaries, whether or not such person is purporting to
     act on behalf of the Company or any of its subsidiaries or
     otherwise, shall be deemed to be a breach of this
     Section 5.02(a) by the Company.  For purposes of this
     Agreement, "takeover proposal" means any proposal for a 
     merger or other business combination involving the Company
     or any of its Significant Subsidiaries or any proposal or
     offer to acquire in any manner, directly or indirectly, an
     equity interest in, not less than 25% of the outstanding
     voting securities of, or assets representing not less than
     25% of the annual revenues of the Company or any of its
     Significant Subsidiaries, other than the transactions
     contemplated by this Agreement.

          (b)  Neither the Board of Directors of the Company nor
     any committee thereof shall (i) withdraw or modify, or
     propose to withdraw or modify, in a manner adverse to Parent
     or Sub, the approval or recommendation by such Board of
     Directors or any such committee of the Offer, this Agreement
     or the Merger, (ii) approve or recommend, or propose to
     approve or recommend, any takeover proposal or (iii) enter
     into any agreement with respect to any takeover proposal. 
     Notwithstanding the foregoing, in the event the Board of
     Directors of the Company receives a takeover proposal that,
     in the exercise of its fiduciary obligations (as determined
     in good faith by the Board of Directors after reviewing the
     advice of outside counsel), it determines to be a superior
     proposal, the Board of Directors may (subject to the
     following sentences) withdraw or modify its approval or
     recommendation of the Offer, this Agreement or the Merger,
     approve or recommend any such superior proposal, enter into
     an agreement with respect to such superior proposal or
     terminate this Agreement, in each case at any time after the
     second business day following Parent's receipt of written
     notice (a "Notice of Superior Proposal") advising Parent
     that the Board of Directors has received a superior
     proposal, specifying the material terms and conditions of
     such superior proposal and identifying the person making
     such superior proposal.  The Company may take any of the
     foregoing actions pursuant to the preceding sentence only if
     Sub shall not have accepted for payment shares of Company
<PAGE>




     Common Stock pursuant to the Offer.  In addition, if the
     Company proposes to enter into an agreement with respect to
     any takeover proposal, it shall concurrently with taking any
     of the foregoing actions pay, or cause to be paid, to Parent
     the Expense Fee (as defined in Section 6.08(b)) and, in the
     event the Company shall enter into such an agreement, such
     agreement shall provide for the payment to Parent of the
     Termination Fee (as defined in Section 6.08(c)) upon the
     consummation of the transaction contemplated by such
     agreement.  For purposes of this Agreement, a "superior
     proposal" means any bona fide takeover proposal on terms
     which the Board of Directors of the Company determines in 
     its good faith reasonable judgment (after reviewing the
     advice of a financial advisor of nationally recognized
     reputation) to be more favorable to the Company's
     stockholders than the Offer and the Merger.  Nothing
     contained herein shall prohibit the Company from taking and
     disclosing to its stockholders a position contemplated by
     Rule 14e-2(a) promulgated under the Exchange Act prior to
     the third business day following Parent's receipt of a
     Notice of Superior Proposal provided that the Company does
     not withdraw or modify its position with respect to the
     Offer or Merger or approve or recommend a takeover proposal.

          (c)  In addition to the obligations of the Company set
     forth in paragraph (b) above, the Company shall promptly
     advise Parent orally and in writing of any request for
     information or of any takeover proposal, or any inquiry with
     respect to or which could lead to any takeover proposal, the
     material terms and conditions of such request, takeover
     proposal or inquiry, and the identity of the person making
     any such takeover proposal or inquiry.  The Company will
     keep Parent fully informed of the status and details of any
     such request, takeover proposal or inquiry.


                              ARTICLE VI

                         Additional Agreements

          SECTION 6.01.  Stockholder Approval; Preparation of
     Proxy Statement.  (a)  If the Company Stockholder Approval
     is required by law, the Company will, at Parent's request,
     as soon as practicable following the expiration of the
     Offer, duly call, give notice of, convene and hold a meeting
     of its stockholders (the "Stockholders Meeting") for the
     purpose of obtaining the Company Stockholder Approval.  The
     Company will, through its Board of Directors, recommend
<PAGE>




     to its stockholders that the Company Stockholder Approval be
     given.  Notwithstanding the foregoing, if Sub or any other
     subsidiary of Parent shall acquire at least 90% of the
     outstanding shares of Company Common Stock, the parties
     shall, at the request of Parent, take all necessary and
     appropriate action to cause the Merger to become effective
     as soon as practicable after the expiration of the Offer
     without a Stockholders Meeting in accordance with
     Section 253 of the DGCL.  Without limiting the generality of
     the foregoing, the Company agrees that its obligations
     pursuant to the first sentence of this Section 6.01(a) shall
     not be affected by (i) the commencement, public proposal, 
     public disclosure or communication to the Company of any
     takeover proposal or (ii) the withdrawal or modification by
     the Board of Directors of the Company of its approval or
     recommendation of the Offer, this Agreement or the Merger.

          (b)  If the Company Stockholder Approval is required by
     law, the Company will, at Parent's request, as soon as
     practicable following the expiration of the Offer, prepare
     and file a preliminary Proxy Statement with the SEC and will
     use its best efforts to respond to any comments of the SEC
     or its staff and to cause the Proxy Statement to be mailed
     to the Company's stockholders as promptly as practicable
     after responding to all such comments to the satisfaction of
     the staff.  The Company will notify Parent promptly of the
     receipt of any comments from the SEC or its staff and of any
     request by the SEC or its staff for amendments or
     supplements to the Proxy Statement or for additional
     information and will supply Parent with copies of all
     correspondence between the Company or any of its
     representatives, on the one hand, and the SEC or its staff,
     on the other hand, with respect to the Proxy Statement or
     the Merger.  If at any time prior to the Stockholders
     Meeting there shall occur any event that should be set forth
     in an amendment or supplement to the Proxy Statement, the
     Company will promptly prepare and mail to its stockholders
     such an amendment or supplement.  The Company will not mail
     any Proxy Statement, or any amendment or supplement thereto,
     to which Parent reasonably objects.

          (c)  Parent agrees to cause all shares of Company
     Common Stock purchased pursuant to the Offer and all other
     shares of Company Common Stock owned by Sub or any other
     subsidiary of Parent to be voted in favor of the Company
     Stockholder Approval.
<PAGE>




          SECTION 6.02.  Access to Information; Confidentiality. 
     The Company shall, and shall cause each of its subsidiaries
     to, afford to Parent, and to Parent's officers, employees,
     accountants, counsel, financial advisers and other
     representatives, reasonable access during normal business
     hours during the period prior to the Effective Time to all
     their respective properties, books, contracts, commitments,
     personnel and records and, during such period, the Company
     shall, and shall cause each of its subsidiaries to, furnish
     promptly to Parent (a) a copy of each report, schedule,
     registration statement and other document filed by it during
     such period pursuant to the requirements of Federal or state 
     securities laws and (b) all other information concerning its
     business, properties and personnel as Parent may reasonably
     request.  Except as required by law, Parent will hold, and
     will cause its officers, employees, accountants, counsel,
     financial advisers and other representatives and affiliates
     to hold, any confidential information in accordance with the
     Confidentiality Agreement dated July 12, 1993, between
     Parent and the Company (the "Confidentiality Agreement"). 
     Parent and its subsidiaries agree not to acquire or agree to
     acquire, or, for 90 days following the termination of this
     Agreement, otherwise obtain beneficial ownership of, the
     stock or assets of any company listed on the Company
     Disclosure Schedule pursuant to this Section 6.02.  

          SECTION 6.03.  Best Efforts; Notification.  (a)  Upon
     the terms and subject to the conditions set forth in this
     Agreement, each of the parties agrees to use its best
     efforts to take, or cause to be taken, all actions, and to
     do, or cause to be done, and to assist and cooperate with
     the other parties in doing, all things necessary, proper or
     advisable to consummate and make effective, in the most
     expeditious manner practicable, the Offer, the Merger and
     the other transactions contemplated by this Agreement and
     the Option Agreements, including (i) the obtaining of all
     necessary actions or nonactions, waivers, consents and
     approvals from Governmental Entities and the making of all
     necessary registrations and filings (including filings with
     Governmental Entities, if any) and the taking of all
     reasonable steps as may be necessary to obtain an approval
     or waiver from, or to avoid an action or proceeding by, any
     Governmental Entity, (ii) the obtaining of all necessary
     consents, approvals or waivers from third parties, (iii) the
     defending of any lawsuits or other legal proceedings, 
<PAGE>




     whether judicial or administrative, challenging this
     Agreement or the Option Agreements or the consummation of
     any of the transactions contemplated by this Agreement or
     the Option Agreements, including seeking to have any stay or
     temporary restraining order entered by any court or other
     Governmental Entity vacated or reversed and (iv) the
     execution and delivery of any additional instruments
     necessary to consummate the transactions contemplated by,
     and to fully carry out the purposes of, this Agreement and
     the Option Agreements.  In connection with and without
     limiting the foregoing, the Company and its Board of
     Directors shall (A) take all action necessary to ensure that 
     no state takeover statute or similar statute or regulation
     is or becomes applicable to the Offer, the Merger, this
     Agreement, the Option Agreements or any of the other
     transactions contemplated by this Agreement or the Option
     Agreements and  (B) if any state takeover statute or similar
     statute or regulation becomes applicable to the Offer, the
     Merger, this Agreement, the Option Agreements or any other
     transaction contemplated by this Agreement or the Option
     Agreements, take all action necessary to ensure that the
     Offer, the Merger and the other transactions contemplated by
     this Agreement and the Option Agreements may be consummated
     as promptly as practicable on the terms contemplated by this
     Agreement and the Option Agreements and otherwise to
     minimize the effect of such statute or regulation on the
     Offer, the Merger and the other transactions contemplated by
     this Agreement and the Option Agreements.  Notwithstanding
     anything to the contrary set forth in this Section 6.03(a),
     the Board of Directors of the Company shall not be
     prohibited from taking any action permitted by
     Section 5.02(b).

          (b)  The Company shall give prompt notice to Parent,
     and Parent shall give prompt notice to the Company, of
     (i) any representation or warranty made by it contained in
     this Agreement that is qualified as to materiality becoming
     untrue or inaccurate in any respect or any such
     representation or warranty that is not so qualified becoming
     untrue or inaccurate in any material respect or (ii) the
     failure by it to comply with or satisfy in any material
     respect any covenant, condition or agreement to be complied
     with or satisfied by it under this Agreement; provided,
     however, that no such notification shall affect the
     representations, warranties, covenants, or agreements of the
     parties or the conditions to the obligations of the parties
     under this Agreement.
<PAGE>




          SECTION 6.04.  Stock Option Plans.  (a)  As soon as
     practicable following the date of this Agreement, the Board
     of Directors of the Company (or, if appropriate, any
     committee administering the Stock Plans) shall adopt such
     resolutions or take such other actions as are required to
     adjust the terms of all outstanding employee stock options
     to purchase shares of Company Common Stock ("Employee Stock
     Options") and all outstanding stock appreciation rights
     ("SARs") heretofore granted under any stock option or stock
     appreciation rights plan, program or arrangement of the
     Company (collectively, the "Stock Plans") to provide that
     each Employee Stock Option (and any SAR related thereto), 
     whether vested or not, outstanding immediately prior to the
     acceptance for payment of shares of Company Common Stock
     pursuant to the Offer shall be cancelled in exchange for a
     cash payment by the Company of an amount equal to (i) the
     excess, if any, of (x) the price per share of Company Common
     Stock to be paid pursuant to the Offer over (y) the exercise
     price per share of Company Common Stock subject to such
     Employee Stock Option, multiplied by (ii) the number of
     shares of Company Common Stock for which such Employee Stock
     Option shall not theretofore have been exercised. 
     Notwithstanding the foregoing, the Employee Stock Options
     granted within six months prior to the Effective Time to
     officers and directors of the Company who are subject to the
     reporting requirements of Section 16 of the Exchange Act and
     the rules promulgated thereunder shall not be cancelled in
     exchange for cash payments, but instead shall be immediately
     converted as of the Effective Time into the right ("Adjusted
     Option") to purchase the Option Conversion Number (as
     defined below) of shares of common stock, par value $.01 per
     share, of Parent (or, in the event Parent has consummated
     prior to the Effective Time the holding company
     reorganization as contemplated by its proxy statement/
     prospectus dated April 26, 1994, shares of common stock, par
     value $.01 per share, of Parent's public holding company
     ("Holdings")).  Each Adjusted Option will have substantially
     the same terms as the Employee Stock Option to which it is
     related, except that:  (i) the Adjusted Option shall be
     deemed fully vested, (ii) if the Adjusted Option holder's
     employment with Parent or the Surviving Company is
     terminated, the Adjusted Option will remain exercisable for
     a period of at least six months after the date of such
     termination and (iii) the exercise price of an Adjusted
     Option shall be an amount equal to the exercise price of the
     Employee Stock Option related to such Adjusted Option as of
     the date of this Agreement divided by the Conversion Number
     (as defined below).  The "Option Conversion Number" for any
<PAGE>




     Adjusted Option shall be equal to the number of shares of
     Company Common Stock purchasable pursuant to the Employee
     Stock Option related to such Adjusted Option as of the date
     of this Agreement multiplied by the Conversion Number.  The
     "Conversion Number" shall be a number equal to (x) the Offer
     Price divided by (y) the average closing price of common
     stock of Parent and/or Holdings, as the case may be, on the
     NYSE Composite Tape for the 30 consecutive trading days
     prior to the Effective Date.  Parent agrees to use best
     efforts to take, and, if applicable, to cause Holdings to
     take, such actions as are necessary for the conversion of
     the Employee Stock Options to Adjusted Options as described 
     above, including the reservation, issuance and listing of
     common stock of Parent or Holdings, as the case may be, as
     is necessary to effect the transactions contemplated by this
     Section 6.04(a).

          (b)  All amounts payable pursuant to this Section 6.04
     shall be subject to any required withholding of taxes and
     shall be paid without interest.  The Company shall use its
     best efforts to obtain all consents of the holders of the
     Employee Stock Options as shall be necessary to effectuate
     the foregoing.  Notwithstanding anything to the contrary
     contained in this Agreement, payment shall, at Parent's
     request, be withheld in respect of any Employee Stock Option
     until all necessary consents are obtained.

          (c)  The Stock Plans shall terminate as of the
     Effective Time, except with respect to Adjusted Options
     granted pursuant to Section 6.04(a), if any, which shall
     continue to be governed by the applicable Stock Plan of the
     Company, and the provision in any other Benefit Plan
     providing for the issuance, transfer or grant of any capital
     stock of the Company or any interest in respect of any
     capital stock of the Company shall be deleted as of the
     Effective Time, and the Company shall ensure that following
     the Effective Time no holder of an Employee Option or SAR or
     any participant in any Stock Plan or other Benefit Plan
     shall have any right thereunder to acquire any capital stock
     of the Company or the Surviving Corporation.

           SECTION 6.05.  Benefit Plans and Employee Matters. 
     (a)  Except as provided in Section 6.04, Parent currently
     intends to cause the Surviving Corporation to maintain for a
     period of three years after the Effective Time the Benefit
     Plans of the Company and its subsidiaries in effect on the
     date of this Agreement or to provide benefits to employees
     of the Company and its subsidiaries that are no less <PAGE>
 



     favorable in the aggregate to such employees than those in
     effect on the date of this Agreement. 

          (b)  Parent currently intends, for a period of three
     years after the Effective Time, to provide, or cause its
     subsidiaries to provide, to persons who are employees of the
     Company or any of its subsidiaries at the Effective Time
     ("Company Employees"), and whose employment is thereafter
     terminated by Parent or any of its subsidiaries, with an
     opportunity to apply for subsequent employment opportunities
     involving substantially similar job qualifications with the
     Parent and its subsidiaries prior to the placement of 
     advertisements or other open notices to the general public
     that such employment opportunities are available; provided,
     however, that neither the Parent nor any of its subsidiaries
     shall have any obligations to offer employment to any such
     former Company Employees.

          SECTION 6.06.  Indemnification, Exculpation and
     Insurance.  (a)  Parent and Sub agree that all rights to
     indemnification and exculpation from liability for acts or
     omissions occurring prior to the Effective Time now existing
     in favor of the current or former directors or officers of
     the Company and its subsidiaries as provided in their
     respective certificates of incorporation or by-laws shall
     survive the Merger and shall continue in full force and
     effect in accordance with their terms for a period of not
     less than six years from the Effective Time.  Parent will
     cause to be maintained for a period of not less than six
     years from the Effective Time the Company's current
     directors' and officers' insurance and indemnification
     policy to the extent that it provides coverage for events
     occurring prior to the Effective Time (the "D&O Insurance")
     for all persons who are directors and officers of the
     Company on the date of this Agreement, so long as the annual
     premium therefor would not be in excess of 200% of the last
     annual premium paid prior to the date of this Agreement (the
     "Maximum Premium"); provided, however, that Parent may, in
     lieu of maintaining such existing D&O Insurance as provided
     above, cause comparable coverage to be provided under any
     policy maintained for the benefit of Parent or any of its
     subsidiaries, so long as the material terms thereof are no
     less advantageous than the existing D&O Insurance.  If the
     existing D&O Insurance expires, is terminated or cancelled
     during such six-year period, Parent will use all reasonable
     efforts to cause to be obtained as much D&O Insurance as can
     be obtained for the remainder of such period for an
     annualized premium not in excess of the Maximum Premium, on
<PAGE>




     terms and conditions no less advantageous than the existing
     D&O Insurance.  The Company represents to Parent that the
     Maximum Premium is $113,400.

          (b)  In the event Parent, the Surviving Corporation or
     any of their successors or assigns (i) consolidates with or
     merges into any other person and shall not be the continuing
     or surviving corporation or entity of such consolidation or
     merger or (ii) transfers all or substantially all of its
     properties and assets to any person, then and in each such
     case, proper provisions shall be made so that the successors
     and assigns of Parent or the Surviving Corporation, as the 
     case may be, shall assume the obligations set forth in this
     Section 6.06.

          SECTION 6.07.  Directors.  Promptly upon the acceptance
     for payment of, and payment for, any shares of Company
     Common Stock by Sub pursuant to the Offer, Sub shall be
     entitled to designate such number of directors on the Board
     of Directors of the Company as will give Sub, subject to
     compliance with Section 14(f) of the Exchange Act, a
     majority of such directors, and the Company shall, at such
     time, cause Sub's designees to be so elected by its existing
     Board of Directors; provided, however, that in the event
     that Sub's designees are elected to the Board of Directors
     of the Company, until the Effective Time such Board of
     Directors shall have at least two directors who are
     directors on the date of this Agreement and who are not
     officers of the Company (the "Independent Directors"); and
     provided further that, in such event, if the number of
     Independent Directors shall be reduced below two for any
     reason whatsoever, the remaining Independent Director shall
     designate a person to fill such vacancy who shall be deemed
     to be an Independent Director for purposes of this Agreement
     or, if no Independent Directors then remain, the other
     directors shall designate two persons to fill such vacancies
     who shall not be officers or affiliates of the Company or
     any of its subsidiaries, or officers or affiliates of Parent
     or any of its subsidiaries, and such persons shall be deemed
     to be Independent Directors for purposes of this Agreement. 
     Subject to applicable law, the Company shall take all action
     requested by Parent necessary to effect any such election,
     including mailing to its stockholders the Information
     Statement containing the information required by
     Section 14(f) of the Exchange Act and Rule 14f-1 promulgated
     thereunder, and the Company agrees to make such mailing with
     the mailing of the Schedule 14D-9 (provided that Sub shall
     have provided to the Company on a timely basis all
<PAGE>




     information required to be included in the Information
     Statement with respect to Sub's designees).  In connection
     with the foregoing, the Company will promptly, at the option
     of Parent, either increase the size of the Company's Board
     of Directors and/or obtain the resignation of such number of
     its current directors as is necessary to enable Sub's
     designees to be elected or appointed to the Company's Board
     of Directors as provided above.

          SECTION 6.08.  Fees and Expenses.  (a)  Except as
     provided below in this Section 6.08, all fees and expenses
     incurred in connection with the Offer, the Merger, this 
     Agreement and the transactions contemplated by this
     Agreement shall be paid by the party incurring such fees or
     expenses, whether or not the Offer or the Merger is
     consummated.

          (b)  The Company shall pay, or cause to be paid, in
     same day funds to Parent all Expenses, not exceeding
     $6,000,000 (the "Expense Fee"), as follows:

          (i) upon demand, unless this Agreement is terminated by
       the Company and Parent or Sub shall have failed to perform
       in any material respect any of its obligations under this
       Agreement, if this Agreement is terminated pursuant to
       Section 8.01(b)(i) as a result of the failure of any
       condition set forth in clause (i) or (iii) of
       paragraph (e) or in paragraph (f) or (g) of Exhibit A; 

          
         (ii) upon demand, unless this Agreement is terminated by
       the Company and Parent or Sub shall have failed to perform
       in any material respect any of its obligations under this
       Agreement, if (x) at any time on or after the date of this
       Agreement until one year following the termination of this
       Agreement, any person or "group" (within the meaning of
       Section 13(d)(3) of the Exchange Act) (other than Parent
       or any of its affiliates) shall have acquired, directly or
       indirectly, the Company, assets representing more than 50%
       of the revenues of the Company or more than 50% of the
       shares of Company Common Stock then outstanding, and
       (y)(A) on or after the date of this Agreement and prior to
       the expiration of the Offer, such person or group shall
       have made a takeover proposal, (B) the Offer, if required
       to have been commenced, shall have remained open until the
       scheduled expiration date immediately following the date
<PAGE>




       such takeover proposal was first publicly announced and
       (C) this Agreement shall have been terminated pursuant to
       Section 8.01(b)(i); or

                   (iii) concurrently with the Company entering into any
       agreement with respect to any superior proposal in
       accordance with Section 5.02(b), unless this Agreement is
       terminated by the Company and Parent or Sub shall have
       failed to perform in any material respect any of its
       obligations under this Agreement.

     "Expenses" shall mean all documented out-of-pocket fees and 
     expenses incurred or paid by or on behalf of Parent in
     connection with the Offer, the Merger or the consummation of
     any of the transactions contemplated by this Agreement,
     including all fees and expenses of counsel, commercial
     banks, investment banking firms, accountants, experts and
     consultants to Parent.

          (c)  The Company shall pay, or cause to be paid, in
     same day funds to Parent upon demand an additional fee of
     $6,000,000 (the "Termination Fee") if (i) the Company shall
     have entered into an agreement with respect to a superior
     proposal in accordance with Section 5.02(b) and the
     transaction contemplated by such agreement (or any
     subsequent agreement involving a takeover proposal entered
     into after the entering into of such agreement) shall have
     been consummated within 12 months of the date of this
     Agreement or (ii) the Company shall not have entered into
     such agreement and the Expense Fee is paid or is payable
     pursuant to paragraph (b)(i) (solely with respect a failure
     of any condition set forth in clause (i) or (iii) of
     paragraph (e) of Exhibit A) or (b)(ii) of this Section 6.08.

          SECTION 6.09.  Public Announcements.  Parent and Sub,
     on the one hand, and the Company, on the other hand, will
     consult with each other before issuing, and provide each
     other the opportunity to review, comment upon and concur
     with, any press release or other public statements with
     respect to the transactions contemplated by this Agreement,
     including the Offer and the Merger, and shall not issue any
     such press release or make any such public statement prior
     to such consultation, except as may be required by
     applicable law, court process or by obligations pursuant to
     any listing agreement with any national market system.  The
     parties agree that the initial press release to be issued
     with respect to the transactions contemplated by 
<PAGE>




     this Agreement shall be in the form heretofore agreed to by
     the parties.

          SECTION 6.10.  Stockholder Litigation.  The Company
     shall give Parent the opportunity to participate in the
     defense or settlement of any stockholder litigation against
     the Company and its directors relating to any of the
     transactions contemplated by this Agreement until the
     purchase of Company Common Stock pursuant to the Offer, and
     thereafter, shall give Parent the opportunity to direct the
     defense of such litigation and, if Parent so chooses to
     direct such litigation, Parent shall give the Company and 
     its directors an opportunity to participate in such
     litigation; provided, however, that no such settlement shall
     be agreed to without Parent's consent, which consent shall
     not be unreasonably withheld; and provided further that no
     settlement requiring a payment by a director shall be agreed
     to without such director's consent.

          SECTION 6.11.  Convertible Notes.  (a)  The Company
     shall deliver, or shall cause to be delivered, as promptly
     as practicable following completion of the Offer and
     following completion of the Merger all notices required with
     respect to either such event to be delivered to each holder
     of the Convertible Notes pursuant to the Note Agreement,
     including an Event Notice (as defined in Section 2.3(a) of
     the Note Agreement) and, if applicable, a Put Notice (as
     defined in Section 2.3(c) of the Note Agreement).  The
     Company shall promptly repurchase from any holders
     exercising their right to sell their Convertible Notes back
     to the Company all such Convertible Notes.

          (b)  The Company shall also take any steps that may be
     necessary to facilitate the automatic adjustment of the
     rights of holders of the Convertible Notes following the
     Effective Time to receive upon conversion of the Convertible
     Notes the Merger Consideration rather than shares of Company
     Common Stock in accordance with Section 9.5 of the Note
     Agreement, including by preparing and executing the lawful
     and adequate provision referred to therein.

          (c)  Immediately following the execution of this
     Agreement, the Company shall deliver to each holder of the
     Convertible Notes a notice dated the date of this Agreement
     that describes the existence of this Agreement and the
     principal economic terms of the Offer and the Merger as
     contemplated in this Agreement and notifies each such holder
     of such holder's continuing right until consummation of the
<PAGE>




     Merger to exercise their right to convert their Convertible
     Notes to shares of Company Common Stock in accordance with
     the terms of such Convertible Notes.


                              ARTICLE VII

                         Conditions Precedent

          SECTION 7.01.  Conditions to Each Party's Obligation to
     Effect the Merger.  The respective obligation of each party
     to effect the Merger is subject to the satisfaction or 
     waiver on or prior to the Closing Date of the following
     conditions:

          (a)  Company Stockholder Approval.  If required by
       applicable law, the Company Stockholder Approval shall
       have been obtained.

          (b)  No Injunctions or Restraints.  No statute, rule,
       regulation, executive order, decree, temporary restraining
       order, preliminary or permanent injunction or other order
       issued by any court of competent jurisdiction or other
       Governmental Entity or other legal restraint or
       prohibition preventing the consummation of the Merger
       shall be in effect; provided, however, that each of the
       parties shall have used best efforts to prevent the entry
       of any such injunction or other order and to appeal as
       promptly as possible any injunction or other order that
       may be entered.

          (c)  Notice to Holders of Convertible Notes.  There
       shall have elapsed 30 days following the receipt by the
       last holder of Convertible Notes of the notice from the
       Company that is referred to in Section 6.11(c).


                             ARTICLE VIII

                   Termination, Amendment and Waiver

          SECTION 8.01.  Termination.  This Agreement may be
     terminated at any time prior to the Effective Time, whether
<PAGE>




     before or after approval of matters presented in connection
     with the Merger by the stockholders of the Company:

          (a) by mutual written consent of Parent and the
       Company;

          (b) by either Parent or the Company:

               (i) if (w) as the result of the failure of any of
          the conditions set forth in paragraphs (a) through (h)
          of Exhibit A to this Agreement, Sub shall have failed
          to commence the Offer in the time required by this 
          Agreement or (x) as a result of the failure of any of
          the conditions set forth in Exhibit A to this Agreement
          the Offer shall have terminated or expired in
          accordance with its terms without Sub having accepted
          for payment any shares of Company Common Stock pursuant
          to the Offer or (y) Sub shall not have accepted for
          payment any shares of Company Common Stock pursuant to
          the Offer within 90 days following the date of this
          Agreement; provided, however, that the right to
          terminate this Agreement pursuant to this
          Section 8.01(b)(i) shall not be available to any party
          whose failure to perform any of its obligations under
          this Agreement results in the failure of any such
          condition or if the failure of such condition results
          from facts or circumstances that constitute a breach of
          representation or warranty under this Agreement by such
          party; or

              (ii) if any Governmental Entity shall have issued
          an order, decree or ruling or taken any other action
          permanently enjoining, restraining or otherwise
          prohibiting the acceptance for payment of, or payment
          for, shares of Company Common Stock pursuant to the
          Offer or the Merger and such order, decree or ruling or
          other action shall have become final and nonappealable;
          or

          (c) by the Company in accordance with the provisions of
       Section 5.02.

          SECTION 8.02.  Effect of Termination.  In the event of
     termination of this Agreement by either the Company or
     Parent as provided in Section 8.01, this Agreement shall
     forthwith become void and have no effect, without any
     liability or obligation on the part of Parent, Sub or the
<PAGE>




     Company, other than the provisions of Section 4.01(o),
     Section 4.02(d), the last two sentences of Section 6.02,
     Section 6.08, this Section 8.02 and Article IX and except to
     the extent that such termination results from the willful
     and material breach by a party of any of its
     representations, warranties, covenants or agreements set
     forth in this Agreement.

          SECTION 8.03.  Amendment.  This Agreement may be
     amended by the parties at any time before or after obtaining
     the Company Stockholder Approval, if required by law;
     provided, however, that after any such approval, there shall 
     not be made any amendment that by law requires further
     approval by such stockholders without the further approval
     of such stockholders.  This Agreement may not be amended
     except by an instrument in writing signed on behalf of each
     of the parties.

          SECTION 8.04.  Extension; Waiver.  At any time prior to
     the Effective Time, the parties may (a) extend the time for
     the performance of any of the obligations or other acts of
     the other parties, (b) waive any inaccuracies in the
     representations and warranties contained in this Agreement
     or in any document delivered pursuant to this Agreement or
     (c) subject to the proviso of Section 8.03, waive compliance
     with any of the agreements or conditions contained in this
     Agreement.  Any agreement on the part of a party to any such
     extension or waiver shall be valid only if set forth in an
     instrument in writing signed on behalf of such party.  The
     failure of any party to this Agreement to assert any of its
     rights under this Agreement or otherwise shall not
     constitute a waiver of those rights.

          SECTION 8.05.  Procedure for Termination, Amendment,
     Extension or Waiver.  A termination of this Agreement
     pursuant to Section 8.01, an amendment of this Agreement
     pursuant to Section 8.03 or an extension or waiver pursuant
     to Section 8.04 shall, in order to be effective, require in
     the case of Parent, Sub or the Company, action by its Board
     of Directors or the duly authorized designee of its Board of
     Directors; provided, however, that in the event that Sub's
     designees are appointed or elected to the Board of Directors
     of the Company as provided in Section 6.07, after the
     acceptance for payment of shares of Company Common Stock
     pursuant to the Offer and prior to the Effective Time, the
     affirmative vote of the Independent Directors shall be
     required by the Company to (i) amend or terminate this
     Agreement by the Company, (ii) exercise or waive any of the
<PAGE>




     Company's rights or remedies under this Agreement or
     (iii) extend the time for performance of Parent's and Sub's
     respective obligations under this Agreement.


                              ARTICLE IX

                          General Provisions

          SECTION 9.01.  Nonsurvival of Representations and
     Warranties.  None of the representations and warranties in
     this Agreement or in any instrument delivered pursuant to 
     this Agreement shall survive the Effective Time or, in the
     case of the Company, shall survive the acceptance for
     payment of, and payment for, of shares of Company Common
     Stock by Sub pursuant to the Offer.  This Section 9.01 shall
     not limit any covenant or agreement of the parties which by
     its terms contemplates performance after the Effective Time.

          SECTION 9.02.  Notices.  All notices, requests, claims,
     demands and other communications under this Agreement shall
     be in writing and shall be deemed given if delivered
     personally, telecopied (which is confirmed) or sent by
     overnight courier (providing proof of delivery) to the
     parties at the following addresses (or at such other address
     for a party as shall be specified by like notice):

          (a) if to Parent or Sub, to

               National Health Laboratories Incorporated
               4225 Executive Square
               Suite 800
               La Jolla, California 92037
               Facsimile:  (619) 658-6693

               Attention:  Mr. James R. Maher

               with a copy to:

               Cravath, Swaine & Moore
               Worldwide Plaza
               825 Eighth Avenue
               New York, New York 10019
               Facsimile:  (212) 474-3700

               Attention:  Allen Finkelson, Esq.
<PAGE>




          (b) if to the Company, to

               Allied Clinical Laboratories, Inc.
               2515 Park Plaza
               Nashville, Tennessee 37203
               Facsimile:  (615) 320-2013

               Attention:  Mr. Haywood D. Cochrane, Jr.

               with a copy to:

               Irell & Manella 
               1800 Avenue of the Stars
               Suite 900
               Los Angeles, California 90067
               Facsimile:  (310) 203-7199

               Attention:  Ronald Loeb, Esq.

               and a copy to:

               Irell & Manella
               333 South Hope Street
               Suite 3300
               Los Angeles, California 90071
               Facsimile:  (213) 229-0515

               Attention:  Stephen Rothman, Esq.

          SECTION 9.03.  Definitions.  For purposes of this
     Agreement:

          (a) an "affiliate" of any person means another person
       that directly or indirectly, through one or more
       intermediaries, controls, is controlled by, or is under
       common control with, such first person;

          (b) "material adverse change" or "material adverse
       effect" means, when used in connection with the Company or
       Parent, any change or effect (or any development that,
       insofar as can reasonably be foreseen, is likely to result
       in any change or effect) that is materially adverse to the
       business, properties, assets, condition (financial or
       otherwise), results of operations or prospects of such
       party and its subsidiaries taken as a whole; provided,
       however, that the existence or occurrence of the following
       events and circumstances, in any combination thereof,
       shall not constitute a "material adverse change" or
<PAGE>




       "material adverse effect":  (i) the subpoena received by
       the Company in 1993 from the Office of Inspector General
       and the United States Attorneys Office for the Southern
       District of California relating to Medicare billing
       practices, and any developments, investigations or charges
       arising therefrom or relating thereto, (ii) the subpoena
       received by the Company in April of 1994 relating to
       Medicare billing practices at the clinical laboratory
       located in Cincinnati, Ohio, and any developments,
       investigations or charges arising therefrom or relating
       thereto, (iii) the assessment from the Internal Revenue
       Service relating to the amortization of intangible items 
       for the years 1989, 1990 and 1991, or any future
       assessment based on the same issue for subsequent years,
       and any developments arising therefrom or relating thereto
       (except to the extent any such change or effect referred
       to in clause (i), (ii) or (iii) above results from a state
       of facts known to the executive officers of the Company,
       after appropriate inquiry, on the date of execution of
       this Agreement and not disclosed in writing to Parent on
       or prior to such time), (iv) any change in laws, rules and
       regulations (Federal, state or local) or reimbursement
       practices, including, without limitation, changes relating
       to Medicare, Medicaid, CHAMPUS program and carrier billing
       practices and (v) changes relating to the cancellation,
       termination or non-renewal by customers (including
       (x) doctors that refer specimens to the Company and
       (y) hospitals, health maintenance organizations, preferred
       provider organizations, the laboratories of which the
       Company manages) of the Company or any of its subsidiaries
       or the voluntary termination by existing general managers,
       sales managers or sales representatives from and after the
       date of the public announcement of this Agreement, unless
       and to the extent such cancellations, terminations or non-
       renewals are directly attributable to factors other than
       the transactions contemplated by this Agreement;

          (c) "person" means an individual, corporation,
       partnership, joint venture, association, trust,
       unincorporated organization or other entity;

          (d) a "subsidiary" of any person means another person,
       an amount of the voting securities, other voting ownership
       or voting partnership interests of which is sufficient to
<PAGE>




       elect at least a majority of its Board of Directors or
       other governing body (or, if there are no such voting
       interests, 50% or more of the equity interests of which)
       is owned directly or indirectly by such first person;

          (e) "superior proposal" has the meaning assigned
       thereto in Section 5.02(b); and

          (f) "takeover proposal" has the meaning assigned
       thereto in Section 5.02(a).

          SECTION 9.04.  Interpretation.  When a reference is 
     made in this Agreement to an Article, a Section, Exhibit or
     Schedule, such reference shall be to an Article or a Section
     of, or an Exhibit or Schedule to, this Agreement unless
     otherwise indicated.  The table of contents and headings
     contained in this Agreement are for reference purposes only
     and shall not affect in any way the meaning or
     interpretation of this Agreement.  Whenever the words
     "include", "includes" or "including" are used in this
     Agreement, they shall be deemed to be followed by the words
     "without limitation".  The words "hereof", "herein" and
     "hereunder" and words of similar import when used in this
     Agreement shall refer to this Agreement as a whole and not
     to any particular provision of this Agreement.  All terms
     defined in this Agreement shall have the defined meanings
     when used in any certificate or other document made or
     delivered pursuant hereto unless otherwise defined herein. 
     The definitions contained in this Agreement are applicable
     to the singular as well as the plural forms of such terms
     and to the masculine as well as to the feminine and neuter
     genders of such term.  Any agreement, instrument or statute
     defined or referred to herein or in any agreement or
     instrument that is referred to herein means such agreement,
     instrument or statute as from time to time amended, modified
     or supplemented, including (in the case of agreements or
     instruments) by waiver or consent and (in the case of
     statutes) by succession of comparable successor statutes and
     references to all attachments thereto and instruments
     incorporated therein.  References to a person are also to
     its permitted successors and assigns.

          SECTION 9.05.  Counterparts.  This Agreement may be
     executed in one or more counterparts, all of which shall be
     considered one and the same agreement and shall become
     effective when one or more counterparts have been signed by
     each of the parties and delivered to the other parties.
<PAGE>




          SECTION 9.06.  Entire Agreement; No Third-Party
     Beneficiaries.  This Agreement and the Confidentiality
     Agreement constitute the entire agreement, and supersede all
     prior agreements and understandings, both written and oral,
     among the parties with respect to the subject matter of this
     Agreement and except for the provisions of Sections 6.04,
     6.05 and 6.06, are not intended to confer upon any person
     other than the parties any rights or remedies hereunder.

          SECTION 9.07.  Governing Law.  This Agreement shall be
     governed by, and construed in accordance with, the laws of
     the State of Delaware, regardless of the laws that might 
     otherwise govern under applicable principles of conflict of
     laws thereof.

          SECTION 9.08.  Assignment.  Neither this Agreement nor
     any of the rights, interests or obligations under this
     Agreement shall be assigned, in whole or in part, by
     operation of law or otherwise by any of the parties without
     the prior written consent of the other parties, except that
     Sub may assign, in its sole discretion, any of or all its
     rights, interests and obligations under this Agreement to
     Parent or to any direct or indirect wholly owned subsidiary
     of Parent, but no such assignment shall relieve Sub of any
     of its obligations under this Agreement.  Subject to the
     preceding sentence, this Agreement will be binding upon,
     inure to the benefit of, and be enforceable by, the parties
     and their respective successors and assigns.

          SECTION 9.09.  Enforcement.  The parties agree that
     irreparable damage would occur in the event that any of the
     provisions of this Agreement were not performed in
     accordance with their specific terms or were otherwise
     breached.  It is accordingly agreed that the parties shall
     be entitled to an injunction or injunctions to prevent
     breaches of this Agreement and to enforce specifically the
     terms and provisions of this Agreement in any court of the
     United States located in the State of Delaware or in
     Delaware state court, this being in addition to any other
     remedy to which they are entitled at law or in equity.  In
     addition, each of the parties hereto (a) consents to submit
     itself to the personal jurisdiction of any Federal court
     located in the State of Delaware or any Delaware state court
     in the event any dispute arises out of this Agreement or any
     of the transactions contemplated by this Agreement,
     (b) agrees that it will not attempt to deny or defeat such
     personal jurisdiction by motion or other request for leave
     from any such court and (c) agrees that it will not bring
<PAGE>




     any action relating to this Agreement or any of the
     transactions contemplated by this Agreement in any court
     other than a Federal or state court sitting in the State of
     Delaware.


          IN WITNESS WHEREOF, Parent, Sub and the Company have
     caused this Agreement to be signed by their respective
     officers thereunto duly authorized, all as of the date first
     written above.

                         NATIONAL HEALTH
                         LABORATORIES INCORPORATED,

                           by
                             /s/James R. Maher
                             ______________________
                             Name:  James R. Maher
                             Title: President and
                                      Chief Executive
                                      Officer


                         N ACQUISITION CORP.,

                           by
                             /s/ James Maher
                             ______________________
                             Name:  James R. Maher
                             Title: President and
                                      Chief Executive
                                      Officer


                         ALLIED CLINICAL LABORATORIES, INC.,

                           by
                               /s/ Haywood D. Cochrane, Jr.
                               _____________________________
                               Name:  Haywood D. Cochrane, Jr.
                               Title: President and
                                        Chief Executive
                                        Officer <PAGE>
 


                                                        Exhibit A
                        Conditions of the Offer

          Notwithstanding any other term of the Offer or this
     Agreement, Sub shall not be required to accept for payment
     or, subject to any applicable rules and regulations of the
     SEC, including Rule 14e-1(c) under the Exchange Act
     (relating to Sub's obligation to pay for or return tendered
     shares of Company Common Stock after the termination or
     withdrawal of the Offer), to pay for any shares of Company
     Common Stock tendered pursuant to the Offer unless (i) there
     shall have been validly tendered and not withdrawn prior to
     the expiration of the Offer that number of shares of Company 
     Common Stock which, together with the number of shares with
     respect to which Sub has a valid and existing option to
     purchase pursuant to the Option Agreements, would represent
     at least a majority of the Fully Diluted Shares (the
     "Minimum Tender Condition") and (ii) any waiting period
     under the HSR Act applicable to the purchase of shares of
     Company Common Stock pursuant to the Offer shall have
     expired or been terminated.  The term "Fully Diluted Shares"
     means all outstanding securities entitled generally to vote
     in the election of directors of the Company on a fully
     diluted basis, after giving effect to the exercise or
     conversion of all options, rights and securities exercisable
     or convertible into such voting securities.  Furthermore,
     notwithstanding any other term of the Offer or this Agree-
     ment, Sub shall not be required to accept for payment or,
     subject as aforesaid, to pay for any shares of Company
     Common Stock not theretofore accepted for payment or paid
     for, and may terminate or amend the Offer, with the consent
     of the Company or if, at any time on or after the date of
     this Agreement and before the acceptance of such shares for
     payment or the payment therefor, any of the following
     conditions exists:

          (a) there shall be pending by any Governmental Entity
       (or the staff of the Federal Trade Commission or the staff
       of the Antitrust Division of the Department of Justice
       shall have recommended the commencement of) any suit,
       action or proceeding, which has a reasonable possibility
       of success, or there shall be pending by any other person
       any suit, action or proceeding, which has a substantial
       likelihood of success, (i) challenging the acquisition by
       Parent or Sub of any shares of Company Common Stock,
       seeking to restrain or prohibit the making or consummation
       of the Offer or the Merger or the performance of any of
       the other transactions contemplated by this Agreement or
<PAGE>




       Company, Parent or Sub any damages that are material in
       relation to the Company and its subsidiaries taken as
       whole, (ii) seeking to prohibit or limit the ownership or
       operation by the Company, Parent or any of their
       respective subsidiaries of a material portion of the
       business or assets of the Company and its subsidiaries,
       taken as a whole, or Parent and its subsidiaries, taken as
       a whole, or to compel the Company or Parent to dispose of
       or hold separate any material portion of the business or
       assets of the Company and its subsidiaries, taken as a
       whole, or Parent and its subsidiaries, taken as a whole,
       as a result of the Offer or any of the other transactions 
       contemplated by this Agreement or the Option Agreements,
       (iii) seeking to impose material  limitations on the
       ability of Parent or Sub to acquire or hold, or exercise
       full rights of ownership of, any shares of Company Common
       Stock accepted for payment pursuant to the Offer including
       without limitation the right to vote the Company Common
       Stock accepted for payment by it on all matters properly
       presented to the stockholders of the Company, (iv) seeking
       to prohibit Parent or any of its subsidiaries from
       effectively controlling in any material respect the
       business or operations of the Company and its subsidiaries
       taken as a whole or (v) which otherwise is reasonably
       likely to have a material adverse effect on the business,
       properties, assets, condition (financial or otherwise),
       results of operations or prospects of the Company and its
       subsidiaries taken as a whole, other than any action or
       proceeding arising out of the existence or occurrence of
       the following events and circumstances, in any combination
       thereof:  (i) the subpoena received by the Company in 1993
       from the Office of Inspector General and the United States
       Attorneys Office for the Southern District of California
       relating to Medicare billing practices, and any
       developments, investigations or charges arising therefrom
       or relating thereto, (ii) the subpoena received by the
       Company in April of 1994 relating to Medicare billing
       practices at the clinical laboratory located in
       Cincinnati, Ohio, and any developments, investigations or
       charges arising therefrom or relating thereto, and
       (iii) the assessment from the Internal Revenue Service
       relating to the amortization of intangible items for the
       years 1989, 1990 and 1991, or any future assessment based
       on the same issue for subsequent years, and any
       developments arising therefrom or relating thereto
<PAGE>




       clause (i), (ii) or (iii) above results from a state of
       facts known to the executive officers of the Company,
       after appropriate inquiry, on the date of execution of
       this Agreement and not disclosed in writing to Parent on
       or prior to such time);

          (b) there shall be any statute, rule, regulation,
       judgment, order or injunction enacted, entered, enforced,
       promulgated or deemed applicable to the Offer, the Merger
       or the Option Agreements, or any other action shall be
       taken by any Governmental Entity or court, other than the
       application to the Offer or the Merger of applicable 
       waiting periods under the HSR Act, that is reasonably
       likely to result, directly or indirectly, in any of the
       consequences referred to in clauses (i) through (iv) of
       paragraph (a) above;

          (c) there shall have occurred any change (or any
       development that, insofar as reasonably can be foreseen,
       is reasonably likely to result in any change) that is
       materially adverse to the business, properties, assets,
       condition (financial or otherwise), results of operations
       or prospects of the Company and its subsidiaries taken as
       a whole, other than changes relating to the existence or
       occurrence of the following events and circumstances, in
       any combination thereof:  (i) the subpoena received by the
       Company in 1993 from the Office of Inspector General and
       the United States Attorneys Office for the Southern
       District of California relating to Medicare billing
       practices, and any developments, investigations or charges
       arising therefrom or relating thereto, (ii) the subpoena
       received by the Company in April of 1994 relating to
       Medicare billing practices at the clinical laboratory
       located in Cincinnati, Ohio, and any developments,
       investigations or charges arising therefrom or relating
       thereto, (iii) the assessment from the Internal Revenue
       Service relating to the amortization of intangible items
       for the years 1989, 1990 and 1991, or any future
       assessment based on the same issue for subsequent years,
       and any developments arising therefrom or relating thereto
       (except to the extent any such change referred to in
       clause (i), (ii) or (iii) above results from a state of
       facts known to the executive officers of the Company,
       after appropriate inquiry, on the date of execution of
       this Agreement and not disclosed in writing to Parent on
<PAGE>




       regulations (Federal, state or local) or reimbursement
       practices, including, without limitation, changes relating
       to Medicare, Medicaid, CHAMPUS program and carrier billing
       practices and (v) changes relating to the cancellation,
       termination or non-renewal by customers (including
       (x) doctors that refer specimens to the Company and
       (y) hospitals, health maintenance organizations, preferred
       provider organizations, the laboratories of which the
       Company manages) of the Company or any of its subsidiaries
       or the voluntary termination by existing general managers,
       sales managers or sales representatives from and after the
       date of the public announcement of this Agreement, unless 
       and to the extent such cancellations, terminations or non-
       renewals are directly attributable to factors other than
       the transactions contemplated by this Agreement;

          (d) there shall have occurred (i) any general
       suspension of trading in, or limitation on prices for,
       equity securities on the New York Stock Exchange
       (excluding any coordinated trading halt triggered solely
       as a result of a specified decrease in a market index),
       (ii) any extraordinary adverse change in the financial
       markets in the United States, (iii) a declaration of a
       banking moratorium or any suspension of payments in
       respect of banks in the United States, (iv) any limitation
       (whether or not mandatory) by any Governmental Entity on,
       or other event that materially affects, the extension of
       credit by banks or other lending institutions, (v) a
       commencement of a war or armed hostilities or other
       national or international calamity directly involving the
       armed forces the United States on a scale greater than any
       other during the two-year period preceding the date of
       this Agreement or (vi) in the case of any of the foregoing
       existing on the date of this Agreement, a material
       acceleration or worsening thereof;

          (e) (i) the Board of Directors of the Company or any
       committee thereof shall have withdrawn or modified in a
       manner adverse to Parent or Sub its approval or
       recommendation of the Offer, the Merger, this Agreement or
       the Option Agreements, or approved or recommended any
       takeover proposal, (ii) the Company shall have entered
       into any agreement with respect to any superior proposal
<PAGE>




          (iii) the Board of Directors of the Company or any
       committee thereof shall have resolved to take any of the
       foregoing actions referred to in clause (i) above;

          (f) any of the representations and warranties of the
       Company set forth in this Agreement that are qualified as
       to materiality shall not be true and correct and any such
       representations and warranties that are not so qualified
       shall not be true and correct in any material respect, in
       each case as of the date of this Agreement or any other
       date as of which such representations and warranties
       expressly speak;
          (g) the Company shall have failed to perform in any
       material respect any obligation or to comply in any
       material respect with any agreement or covenant of the
       Company to be performed or complied with by it under this
       Agreement; or

          (h) this Agreement shall have been terminated in
       accordance with its terms;

     which, in the reasonable good faith judgment of Sub or
     Parent, in any such case, and regardless of the
     circumstances giving rise to any such condition (other than
     any action or inaction by Parent or any of its subsidiaries
     which constitutes a breach of this Agreement), makes it
     inadvisable to proceed with such acceptance for payment or
     payment.

          The foregoing conditions are for the sole benefit of
     Sub and Parent and may be asserted by Sub or Parent
     regardless of the circumstances giving rise to such
     condition (other than any action or inaction by Parent or
     any of its subsidiaries which constitutes a breach of this
     Agreement) or may be waived by Sub and Parent in whole or in
     part at any time and from time to time in their sole
     discretion.  The failure by Parent, Sub or any other
     affiliate of Parent at any time to exercise any of the
     foregoing rights shall not be deemed a waiver of any such
     right, the waiver of any such right with respect to
     particular facts and circumstances shall not be deemed a
     waiver with respect to any other facts and circumstances and
     each such right shall be deemed an ongoing right that may be
     asserted at any time and from time to time.
<PAGE>








                                                 CONFORMED COPY





                                     CREDIT AGREEMENT

                                 Dated as of April 7, 1994



                        National Health Laboratories Incorporated, a
               Delaware corporation (the "Borrower"), and Citicorp USA,
               Inc. (the "Bank") agree as follows:


                                         ARTICLE I

                             AMOUNTS AND TERMS OF THE ADVANCES

                        SECTION 1.01.  The Advances.  The Bank agrees, on
               the terms and conditions hereinafter set forth, to make
               advances (each an "Advance") to the Borrower from time to
               time on any Business Day (as hereinafter defined) during the
               period from the date hereof until July 31, 1994 (such date,
               or the earlier date of termination of the Commitment (as
               defined below) pursuant to Section 1.04 or 5.01, being the
               "Termination Date") in an aggregate amount not to exceed at
               any time outstanding $50,000,000, as such amount may be
               reduced pursuant to Section 1.04 (the "Commitment").  Each
               Advance shall be in an amount not less than $10,000,000 or
               an integral multiple of $1,000,000 in excess thereof. 
               Within the limits of the Commitment, the Borrower may
               borrow, prepay pursuant to Section 1.05(a) and reborrow
               under this Section 1.01.

                        SECTION 1.02.  Making the Advances.  (a)  Each
               Advance shall be made on notice, given not later than 11:00
               A.M. (New York City time) on the first Business Day prior to
               the date of a proposed Base Rate Advance (as hereinafter
               defined) or the third Business Day prior to the date of a
               proposed Eurodollar Rate Advance (as hereinafter defined),
               by the Borrower to the Bank.  Each such notice of an Advance
               shall be by telecopier, telex or cable, and with respect to
               any such notice by telex or cable, confirmed immediately
               thereafter in writing, specifying therein the requested date
               and amount thereof and selecting the interest rate therefor
               pursuant to Section 1.06 and, if such Advance is to be a
               Eurodollar Rate Advance, the initial Interest Period (as
               hereinafter defined) for such Advance.  Not later than 12:00
               noon (New York City time) on the date of such Advance and
               upon fulfillment of the applicable conditions set forth in
               Article II, the Bank will make such Advance available to the
<PAGE>









               Borrower in same day funds by crediting the Borrower's
               Account (as defined in the $350,000,000 Credit Agreement
               dated as of August 27, 1993, as heretofore amended (as so
               amended, the "Existing Credit Agreement"), among the
               Borrower, the banks party thereto, The Long-Term Credit Bank
               of Japan, Ltd., Los Angeles Agency, NationsBank of North
               Carolina, N.A. and The Toronto-Dominion Bank, as Co-Agents).

                        (b)  Each notice from the Borrower to the Bank
               requesting an Advance shall be irrevocable and binding on
               the Borrower.  The Borrower shall indemnify the Bank against
               any loss, cost or expense incurred by the Bank as a result
               of any failure to fulfill on or before the date specified in
               such notice for such Advance the applicable conditions set
               forth in Article II, including, without limitation, any
               loss, cost or expense incurred by reason of the liquidation
               or reemployment of deposits or other funds acquired by the
               Bank to fund the Advance when such Advance, as a result of
               such failure, is not made on such date.

                        (c)  The Borrower may not request a Eurodollar Rate
               Advance or select a new Interest Period for existing
               Eurodollar Rate Advances if, after the making or Conversion
               (as hereinafter defined) of such Advances or the selection
               of such Interest Period, the number of outstanding
               Eurodollar Advances having different Interest Periods
               (whether of different duration or commencing on different
               dates) would exceed six.

                        SECTION 1.03.  Repayment.  The Borrower shall repay
               to the Bank the outstanding principal amount of the Advances
               on August 1, 1994.

                        SECTION 1.04.  Reduction of the Commitment.  
               (a) Optional.  The Borrower shall have the right, upon at
               least three Business Days' notice to the Bank, to terminate
               in whole or reduce in part the unused portion of the
               Commitment; provided that each partial reduction shall be in
               the amount of $10,000,000 or an integral multiple of
               $1,000,000 in excess thereof.

                        (b)  Mandatory.  The Commitment shall be
               permanently reduced upon the date of receipt of the Net Cash
               Proceeds (as defined in the Existing Credit Agreement) from
               the creation or incurrence by the Borrower or any of its
               Subsidiaries (as defined in the Existing Credit Agreement)
               of any Funded Debt (as defined in the Existing Credit
               Agreement), by the amount of such Funded Debt.
<PAGE>









                        SECTION 1.05.  Prepayments.  (a)  Optional.  The
               Borrower may, upon at least one Business Day's notice to the
               Bank, in the case of Base Rate Advances, and three Business
               Days' notice to the Bank, in the case of Eurodollar Rate
               Advances, stating the proposed date and aggregate principal
               amount of the prepayment, and if such notice is given, the
               Borrower shall, prepay the outstanding principal amounts of
               an Advance in whole or in part, together with accrued
               interest to the date of such prepayment on the principal
               amount so prepaid; provided, however, that (x) each partial
               prepayment shall be in an aggregate principal amount not
               less than $10,000,000 or an integral multiple of $1,000,000
               in excess thereof (or, if the aggregate principal amount of
               such Advance is less, such aggregate principal amount) and
               (y) in the event any such prepayment of an Eurodollar Rate
               Advance is not made on the last day of an Interest Period,
               the Borrower shall be obligated to reimburse the Bank in
               respect thereof pursuant to Section 6.04(b).

                        (b)  Mandatory.  The Borrower shall, on each
               Business Day, prepay an aggregate principal amount of the
               Advances equal to the amount by which (i) the aggregate
               principal amount of the Advances then outstanding exceeds
               (ii) the Commitment on such Business Day.

                        SECTION 1.06.  Interest.  (a)  Ordinary Interest. 
               The Borrower shall pay interest on the unpaid principal
               amount of each Advance from the date of such Advance until
               such principal amount shall be paid in full, at the
               following rates per annum:

                        (i)  Base Rate Advances.  During such periods as
                   such Advance is a Base Rate Advance, a rate per annum
                   equal at all times to the sum of the Base Rate in effect
                   from time to time plus the Applicable Margin (as defined
                   below) in effect from time to time, payable in arrears
                   quarterly on the last Business Day of each March, June,
                   September and December during such periods and on the
                   date such Base Rate Advance shall be Converted (as
                   hereinafter defined) or paid in full.

                       (ii)  Eurodollar Rate Advances.  During such periods
                   as such Advance is a Eurodollar Rate Advance, a rate per
                   annum equal at all times during each Interest Period for
                   such Advance to the sum of the Eurodollar Rate for such
                   Interest Period plus the Applicable Margin in effect
                   from time to time, payable in arrears on the last day of
                   such Interest Period.
<PAGE>









                        (b)  Default Interest.  The Borrower shall pay on
               demand interest on the unpaid principal amount of each
               Advance that is not paid when due and on the unpaid amount
               of all interest, fees and other amounts then due and payable
               hereunder that is not paid when due from the due date
               thereof to the date paid, at a rate per annum equal at such
               time to (i) in the case of any amount of principal, 2% per
               annum above the rate of interest per annum required to be
               paid on such Advance immediately prior to the date on which
               such amount became due and payable, and (ii) in the case of
               all other amounts, 2% per annum above the rate per annum
               required to be paid on Base Rate Advances pursuant to clause
               (a)(i) above.

                        (c)  Certain Definitions.  As used in this
               Agreement, the following terms have the following meanings:

                        "Applicable Lending Office" means the Bank's
                   Domestic Lending Office in the case of a Base Rate
                   Advance and the Bank's Eurodollar Lending Office in the
                   case of a Eurodollar Rate Advance.

                        "Applicable Margin" shall have the meaning set
                   forth in the Existing Credit Agreement with all
                   references in such definition to a "Borrowing" being a
                   reference to an Advance.

                        "Base Rate" shall have the meaning set forth in the
                   Existing Credit Agreement with all references therein to
                   "Citibank" being references to the Bank.

                        "Base Rate Advance" means an Advance which bears
                   interest as provided in Section 1.06(a)(i).

                        "Business Day" shall have the meaning set forth in
                   the Existing Credit Agreement.

                        "Conversion", "Convert" and "Converted" each refers
                   to a conversion of an Advance of one Type into an
                   Advance of another Type pursuant to Section 1.07, 1.10
                   or 1.13.

                        "Domestic Lending Office" means the office of the
                   Bank specified as its "Domestic Lending Office" opposite
                   its name on the signature pages hereof, or such other
                   office of the Bank as the Bank may from time to time
                   specify to the Borrower.

                        "Eurocurrency Liabilities" shall have the meaning
                   set forth in the Existing Credit Agreement.
                
<PAGE>









                        "Eurodollar Lending Office" means the office of the
                   Bank specified   as its "Eurodollar Lending Office"
                   opposite its name on the signature pages hereof, or such
                   other office of the Bank as the Bank may from time to
                   time specify to the borrower.  

                        "Eurodollar Rate" shall have the meaning set forth
                   in the Existing Credit Agreement with all references
                   therein to"Citibank" being references to "the Bank" and
                   all references therein to "Section 2.07" being
                   references to Section 1.07.

                        "Eurodollar Rate Advance" means an Advance which
                   bears interest as provided in Section 1.06(a)(ii).

                        "Eurodollar Rate Reserve Percentage" shall have the
                   meaning set forth in the Existing Credit Agreement with
                   all references therein to "Lender" being references to
                   the Bank.

                        "Federal Funds Rate" shall have the meaning set
                   forth in the Existing Credit Agreement with all
                   references therein to "Agent" being references to the
                   Bank.

                        "Interest Period" means, for each Eurodollar Rate
                   Advance, the period commencing on the date of such
                   Eurodollar Rate Advance or the date of the Conversion of
                   any Base Rate Advance into such Eurodollar Rate Advance 
                   and ending on the last day of the period selected by the
                   Borrower pursuant to the provisions below and,
                   thereafter, each subsequent period commencing on the
                   last day of the immediately preceding Interest Period
                   and ending on the last day of the period selected by the
                   Borrower pursuant to the provisions below.  The duration
                   of each such Interest Period shall be one, two or three
                   months as the Borrower may, upon notice received by the
                   Bank not later than 11:00 A.M. (New York City time) on
                   the third Business Day prior to the first day of such
                   Interest Period, select; provided, however, that:

                             (i)  the Borrower may not select any Interest
                        Period which ends after the Termination Date;

                             (ii)  whenever the last day of any Interest
                        Period would otherwise occur on a day other than a
                        Business Day, the last day of such Interest Period
                        shall be extended to occur on the next succeeding
<PAGE>









                        Business Day, provided, that, if such extension
                        would cause the last day of such Interest Period to
                        occur in the next  following calendar month, the
                        last day of such Interest Period shall occur on the
                        next preceding Business Day; and

                             (iii)  whenever the first day of any Interest
                        Period occurs on a day in a calendar month for
                        which there is no numerically corresponding day in
                        the calendar month that succeeds such initial
                        calendar month by the number of months equal to the
                        number of months in such Interest Period, such
                        Interest Period shall end on the last Business Day
                        of such succeeding calendar month.

                        "Moody's" means Moody's Investors Service, Inc.

                        "S&P" means Standard & Poor's Corporation.

                        "Type" refers to the distinction between Advances
                   bearing interest at the Base Rate and Advances bearing
                   interest at the Eurodollar Rate.

               References to terms and definitions incorporated in this
               Agreement by reference to the Existing Credit Agreement
               shall, unless otherwise defined in this Agreement, have the
               meanings set forth in the Existing Credit Agreement.

                        SECTION 1.07.  Interest Rate Determination.  (a) 
               The Bank shall give prompt notice to the Borrower of the
               applicable interest rate determined by the Bank for purposes
               of Section 1.06(a).

                        (b)  If the Bank cannot determine the Eurodollar
               Rate, the Bank shall forthwith notify the Borrower that the
               interest rate cannot be determined for Eurodollar Rate
               Advances, whereupon (i) each Eurodollar Rate Advance will
               automatically, on the last day of the then existing Interest
               Period therefor, Convert into a Base Rate Advance and (ii)
               the obligation of the Bank to make, or to Convert Advances
               into, Eurodollar Rate Advances shall be suspended until the
               Bank shall notify the Borrower that it has determined that
               the circumstances causing such suspension no longer exist.

                        (c)  If the Bank determines that the Eurodollar
               Rate for any Interest Period for a Eurodollar Rate Advance
               will not adequately reflect the cost to the Bank of making,
               funding or maintaining such Eurodollar Rate Advance for such
               Interest Period, the Bank shall forthwith so notify the 
<PAGE>









               Borrower, whereupon (i) such Eurodollar Rate Advance will
               automatically, on the last day of the then existing Interest
               Period therefor, Convert into a Base Rate Advance and (ii)
               the obligation of the Bank to make, or to Convert Advances
               into, Eurodollar Rate Advances shall be suspended until the
               Bank shall notify the Borrower that it has determined that
               the circumstances causing such suspension no longer exist.

                        (d)  If the Borrower shall fail to select the
               duration of any Interest Period for any Eurodollar Rate
               Advance in accordance with the provisions contained in the
               definition of "Interest Period" in Section 1.06(c), the Bank
               will forthwith so notify the Borrower and the Interest
               Period for such Eurodollar Rate Advance will be one month.

                        SECTION 1.08.  Fees.  (a)  Commitment Fee.  The
               Borrower agrees to pay to the Bank a commitment fee on the
               average daily unused portion of the Commitment from the date
               hereof until the Termination Date at a rate equal to (i)
               whenever the Borrower's long-term senior unsecured debt is
               not rated by both S&P and Moody's, 0.375% per annum, and
               (ii) at all other times, a percentage per annum determined
               by reference to the Ratings (as defined in the Existing
               Credit Agreement) in effect from time to time, as follows:

                        Minimum Debt
                           Rating                Commitment
                       (S&P/Moody's)                   Fee     

                        A-/A3 and above             0.200%
                        BBB/Baa2                    0.300%
                        BBB-/Baa3                   0.375%
                        Below BBB-/Baa3             0.500%

               If there is a split in the Ratings, then commitment fees
               will be determined by the lower of the two Ratings.  In each
               case, the commitment fee shall be payable in arrears on (x)
               the last Business Day of each March, June, September and
               December commencing June 30, 1994 and (y) the Termination
               Date.

                        (b)  Facility Fee.  The Borrower agrees to pay to
               the Bank a facility fee equal to 1/4 of 1% of the initial
               Commitment on the date hereof.

                        SECTION 1.09.  The Borrower and the Bank hereby
               agree to comply with all of the provisions of Section 2.09
               of the Existing Credit Agreement with all references therein
<PAGE>









               to  "Agent" and "Lender" being references to the Bank, all
               references therein to "this Agreement" being references to
               this Agreement, all references therein to "Commitments"
               being references to the Commitment and all references
               therein to "Section 2.12" being references to Section 1.12
               hereof.

                        SECTION 1.10.  Illegality.  Notwithstanding any
               other provision of this Agreement, if the introduction of or
               any change in or in the interpretation of any law or
               regulation makes it unlawful, or any central bank or other
               governmental authority asserts that it is unlawful, for the
               Bank or its Eurodollar Lending Office to perform its
               obligations hereunder to make Eurodollar Rate Advances or to
               fund or maintain Eurodollar Rate Advances hereunder, then,
               upon written notice by the Bank to the Borrower, (i) each
               Eurodollar Rate Advance will automatically Convert into a
               Base Rate Advance and (ii) the obligation of the Bank to
               make, or to Convert Base Rate Advances into, Eurodollar Rate
               Advances shall be suspended until the Bank shall notify the
               Borrower that the circumstances causing such suspension no
               longer exist; provided, however, that, before making any
               such demand, the Bank shall designate a different Eurodollar
               Lending Office if the making of such a designation would
               avoid the need for giving such notice and demand and would
               not, in the judgment of the Bank, be otherwise
               disadvantageous to the Bank.

                        For purposes of this Section 1.10, a notice to the
               Borrower by the Bank shall be effective with respect to any
               Advance on the last day of the then current Interest Period
               for such Advance; provided, however, that, if it is not
               lawful for the Bank to maintain such Advance until the end
               of the Interest Period applicable thereto, then the notice
               to the Borrower shall be effective upon receipt by the
               Borrower.

                        SECTION 1.11.  Payments and Computations.  (a)  The
               Borrower shall make each payment hereunder and under the
               Note not later than 11:00 A.M. (New York City time) on the
               day when due in U.S. dollars to the Bank at its address
               referred to in Section 6.02 in same day funds.

                        (b)  The Borrower hereby authorizes the Bank, if
               and to the extent payment of principal, interest or fees
               owed to the Bank is not made when due hereunder or under the
               Note, to charge from time to time against any or all of the
               Borrower's accounts with the Bank any amount so due. <PAGE>
 








                        (c)  All computations of interest based on the
               Eurodollar Rate or the Federal Funds Rate shall be made by
               the Bank, on the basis of a year of 360 days, and all
               computations of interest based on the Base Rate and of
               commitment fees shall be made by the Bank on the basis of a
               year of 365 or 366 days, as the case may be, in each case
               for the actual number of days (including the first day but
               excluding the last day) occurring in the period for which
               such interest or commitment fees are payable.  Each
               determination by the Bank of an interest rate hereunder
               shall be conclusive and binding for all purposes, absent
               manifest error.

                        (d)  Whenever any payment hereunder or under the
               Note shall be stated to be due on a day other than a
               Business Day, such payment shall be made on the next
               succeeding Business Day, and such extension of time shall in
               such case be included in the computation of payment of
               interest or 
               commitment fee, as the case may be; provided, however, if
               such extension would cause payment of interest on or
               principal of Eurodollar Rate Advances to be made in the next
               following calendar month, such payment shall be made on the
               next preceding Business Day.

                        SECTION 1.12.  Taxes.  The Borrower and the Bank
               hereby agree to comply with all provisions of Section 2.12
               of the Existing Credit Agreement with all references therein
               to "Agent" and "Lender" being references to the Bank, all
               references to "this Agreement" or "hereunder" being
               references to this Agreement, all references to "Note" and
               "Notes" being references to the Note and all references
               therein to "Section 2.11" and "Section 8.02" being
               references to Sections 1.11 and 6.02 hereof, respectively.

                        SECTION. 1.13.  Conversion of Advances.  (a) 
               Optional.  The Borrower may on any Business Day, upon notice
               given to the Bank not later than noon (New York City time)
               on the third Business Day prior to the date of the proposed
               Conversion and subject to the provisions of Sections 1.07
               and 1.10, Convert all or any portion of an Advance of one
               Type into an Advance of the other Type; provided, however,
               that any Conversion of any Eurodollar Rate Advance into an
               Base Rate Advance shall be made on, and only on, the last
               day of an Interest Period for such Eurodollar Rate Advance,
               and any Conversion of a Base Rate Advance into an Eurodollar
               Rate Advance shall be subject to the limitation set forth in
               Section 1.02(c) and in an amount not less than $10,000,000. 
<PAGE>









               Each such notice of Conversion shall, within the
               restrictions specified above, specify (i) the date of such
               Conversion,  (ii) the Advance to be Converted and (iii) if
               such Conversion is into an Eurodollar Rate Advance, the
               duration of the initial Interest Period for such Advance. 
               Each notice of Conversion shall be irrevocable and binding
               on the Borrower.

                        (b)  Mandatory.  (i)  On the date on which the
               aggregate unpaid principal amount of an Eurodollar Rate
               Advance shall be reduced, by payment or prepayment or
               otherwise, to less than $10,000,000, such Advance shall
               automatically Convert into a Base Rate Advance.

                        (ii)  Upon the occurrence and during the
               continuance of any Event of Default set forth in Section
               5.01 (or, in the case of any involuntary proceeding
               described in Section 6.01(e) of the Existing Credit
               Agreement, an event that would constitute an Event of
               Default but for the requirement that notice be given or time
               elapse or both), (A) each Eurodollar Rate Advance will
               automatically, on the last day of the then existing Interest
               Period therefor, Convert into a Base Rate Advance and (B)
               the obligation of the Bank to make, or to Convert Advances
               into, Eurodollar Rate Advances shall be suspended.


                                        ARTICLE II

                                   CONDITIONS OF LENDING

                        SECTION 2.01.  Condition Precedent to Initial
               Advance.  The obligation of the Bank to make its initial
               Advance is subject to the condition precedents that (a) the
               Borrower shall have paid all accrued fees of the Bank and 
               (b) the Bank shall have received on or before the day of
               such Advance the following, each dated such day, in form and
               substance satisfactory to the Bank:

                        (i)  The Note.

                       (ii)  Certified copies of the resolutions of the
                   Board of Directors of the Borrower approving this
                   Agreement and the Note, and of all documents evidencing
                   other necessary corporate action and governmental
                   approvals, if any, with respect to this Agreement and
                   the Note.
<PAGE>









                      (iii)  A certificate of the Secretary or an Assistant
                   Secretary of the Borrower certifying the names and true
                   signatures of the officers of the Borrower authorized to
                   sign this Agreement and the Note and the other documents
                   to be delivered hereunder.

                      (iv)  A favorable opinion of James G. Richmond, Esq.,
                   Executive Vice President and General Counsel of the
                   Borrower, and of Paul, Weiss, Rifkind, Wharton &
                   Garrison, special New York counsel for the Borrower,
                   substantially in the forms of Exhibit B and C hereto,
                   respectively, and as to such other matters as the Bank
                   may reasonably request.

                       (v)  A favorable opinion of Shearman & Sterling,
                   counsel for the Bank, as to such matters as the Bank may
                   reasonably request.

                      (vi)  A certificate of the Borrower stating that (i)
                   the representations and warranties contained in Section
                   4.01 of the Existing Credit Agreement are correct in all
                   material respects on and as of the date hereof, as
                   though made on and as of the date hereof and (ii) no
                   event has occurred and is continuing which constitutes a
                   "Default" under the Existing Credit Agreement.

                        SECTION 2.02.  Conditions Precedent to All
               Advances.  The obligation of the Bank to make each Advance
               (including the initial Advance) resulting in an increase in
               the aggregate amount of outstanding Advances shall be
               subject to the further conditions precedent that on the date
               of such Advance (a) the following statements shall be true
               (and each of the giving of the applicable notice requesting
               such Advance and the acceptance by the Borrower of the
               proceeds of such Advance shall constitute a representation
               and warranty by the Borrower that on the date of such
               Advance such statements are true):

                        (i)  The representations and warranties contained
                   in Section 3.01 are correct in all material respects on
                   and as of the date of such Advance, before and after
                   giving effect to such Advance and to the application of
                   the proceeds therefrom, as though made on and as of such
                   date; and

                       (ii)  No event has occurred and is continuing, or
                   would result from such Advance or from the application
                   of the proceeds therefrom, which constitutes an Event of
<PAGE>









                   Default (as defined in Section 5.01 hereof) or would 
                   constitute an Event of Default but for the requirement
                   that notice be given or time elapse or both; and 

                      (iii)  No authorization or approval or other action
                   by, and no notice to or filing with, any governmental
                   authority or regulatory body is required for any  
                   Repurchase (as defined in the Existing Credit
                   Agreement) that may be made with the proceeds of
                   such Advance other than those that have been duly
                   obtained 

               and (b) the Bank shall have received such other
               certificates, opinions or documents as the Bank may
               reasonably request in order to confirm (i) the accuracy of
               the Borrower's representations and warranties, (ii) the
               Borrower's timely compliance with the terms, covenants and
               agreements set forth in this Agreement, (iii) the absence of
               any event which constitutes an Event of Default or would
               constitute an Event of Default but for the requirement that
               notice be given or time elapse or both and (iv) the absence
               of any event of the type referred to in Section 1.10.


                                        ARTICLE III

                              REPRESENTATIONS AND WARRANTIES

                        SECTION 3.01.  Representations and Warranties of
               the Borrower.  The Borrower represents and warrants for the
               benefit of the Bank as to the matters set forth in Section
               4.01 of the Existing Credit Agreement with all references
               therein to "this Agreement" and "the Notes" being references
               to this Agreement and the Note, respectively, and all
               references therein to "Agent", "Lender", "Required Lenders"
               and "Lenders" being references to the Bank; provided,
               however, that the Borrower hereby agrees that any amendment,
               modification or waiver of the provisions of Section 4.01 of
               the Existing Credit Agreement shall have no effect on the
               obligations of the Borrower under this Section 3.01 unless
               the Bank consents to such amendment, modification or waiver.


                                        ARTICLE IV

                                 COVENANTS OF THE BORROWER

                        SECTION 4.01.  Affirmative Covenants.  So long as
<PAGE>









               the Note shall remain unpaid or the Bank shall have any
               Commitment hereunder, the Borrower will, unless the Bank
               shall otherwise consent in writing, comply with all of the
               terms and provisions of Section 5.01 of the Existing Credit
               Agreement, with all references therein to "this Agreement"
               and "the Notes" being references to this Agreement and the
               Note, respectively, and all references therein to "Agent",
               "Lender", "Required Lenders" and "Lenders" being references
               to the Bank; provided, however, that the Borrower hereby 
               agrees that any amendment, modification or waiver of the
               provisions of Section 5.01 of the Existing Credit Agreement
               shall have no effect on the obligations of the Borrower
               under this Section 4.01 unless the Bank consents to such
               amendment, modification or waiver.

                        SECTION 4.02.  Negative Covenants.  So long as the
               Note shall remain unpaid or the Bank shall have any
               Commitment hereunder, the Borrower will, unless the Bank
               shall otherwise consent in writing, comply with all of the
               terms and provisions of Section 5.02 of the Existing Credit
               Agreement, with all references therein to "this Agreement"
               and "the Notes" being references therein to this Agreement
               and the Note, respectively, and all references therein to
               "Agent", "Lender", "Required Lenders" and "Lenders" being
               references to the Bank; provided, however, that the Borrower
               hereby agrees that any amendment, modification or waiver of
               the provisions of Section 5.02 of the Existing Credit
               Agreement shall have no effect on the obligations of the
               Borrower under this Section 4.02 unless the Bank consents to
               such amendment, modification or waiver.



                                         ARTICLE V

                                     EVENTS OF DEFAULT

                        SECTION 5.01.  Events of Default.  If any of the
               events set forth in Section 6.01(a) through (k) of the
               Existing Credit Agreement ("Events of Default") shall occur
               and be continuing, then, and in any such event, the Bank (i)
               may declare its obligation to make Advances to be
               terminated, whereupon the same shall forthwith terminate,
               and (ii) may, by notice to the Borrower, declare the Note,
               all interest thereon and all other amounts payable under
               this Agreement to be forthwith due and payable, whereupon
               the Note, all such interest and all such amounts shall
               become and be forthwith due and payable, without
<PAGE>









               presentment, demand, protest or further notice of any kind,
               all of which are hereby expressly waived by the Borrower;
               provided, however, that, in the event of an actual or deemed
               entry of an order for relief with respect to the Borrower
               under the Federal Bankruptcy Code, (A) the obligation of the
               Bank to make Advances shall automatically be terminated and
               (B) the Note, all such interest and all such amounts shall
               automatically become due and payable, without presentment,
               demand, protest or any notice of any kind, all of which are
               hereby expressly waived by the Borrower.  For purposes of
               this Section 5.01, all  references in Section 6.01(a)
               through (k) to "this Agreement" and "the Notes" shall be
               references to this Agreement and the Note, respectively, and
               all references therein to "the Agent", "the Required
               Lenders" and "the Lenders" shall be references to the Bank;
               provided, however, that the Borrower hereby agrees that any
               amendment, modification or waiver of the provisions of
               Section 6.01 of the Existing Credit Agreement shall have no
               effect on the obligations of the Borrower, or the rights of
               the Bank, under this Section 6.01 unless the Bank consents
               to such amendment, modification or waiver.


                                        ARTICLE VI

                                       MISCELLANEOUS

                        SECTION 6.01.  Amendments, Etc.  No amendment or
               waiver of any provision of this Agreement or the Note, nor
               consent to any departure by the Borrower therefrom, shall in
               any event be effective unless the same shall be in writing
               and signed by the Bank, and then such waiver or consent
               shall be effective only in the specific instance and for the
               specific purpose for which given.

                        SECTION 6.02.  Notices, Etc.  All notices and other
               communications provided for hereunder shall be in writing
               (including telecopier, telegraphic, telex or cable
               communication) and mailed, telecopied, telegraphed, telexed,
               cabled or delivered, if to the Borrower, at its address at
               4225 Executive Square, Suite 800, La Jolla, California
               92037, Attention:  Vice President - Finance; and if to the
               Bank, at its address at 399 Park Avenue, New York, New York
               10043, Attention:  Steven Victorin; or, as to each party, at
               such other address as shall be designated by such party in a
               written notice to the other party.  All such notices and
               communications shall be effective (i) when received, if
               mailed or delivered or telecopied (including machine
<PAGE>









               acknowledgement), or (ii) when delivered to the telegraph
               company, confirmed by telex answerback or delivered to the
               cable company, respectively, except that notices to the Bank
               pursuant to the provisions of Article I shall not be
               effective until received by the Bank.

                        SECTION 6.03.  No Waiver; Remedies.  No failure on
               the part of the Bank to exercise, and no delay in
               exercising, any right hereunder or under the Note shall
               operate as a waiver thereof; nor shall any single or partial
               exercise of any such right preclude any other or further
               exercise thereof  or the exercise of any other right.  The
               remedies herein provided are cumulative and not exclusive of
               any remedies provided by law.

                        SECTION 6.04.  Costs, Expenses and Taxes.  (a)  The
               Borrower agrees to pay on demand all reasonable
               out-of-pocket costs and expenses of the Bank in connection
               with the preparation, execution, delivery, administration,
               modification and amendment of this Agreement, the Note and
               the other documents to be delivered hereunder (including,
               without limitation, (A) all due diligence, transportation,
               computer, duplication, appraisal, audit and insurance
               expenses and fees and expenses of consultants engaged with
               the prior consent of the Borrower (which consent shall not
               be unreasonably withheld) and (B) the reasonable fees and
               out-of-pocket expenses of counsel for the Bank with respect
               thereto, with respect to advising the Bank as to its rights
               and responsibilities, or the protection or preservation of
               its rights or interests, under this Agreement and the Note,
               with respect to negotiations with the Borrower or with other
               creditors of the Borrower arising out of any Event of
               Default or event that would constitute an Event of Default
               but for the requirement that notice be given or time elapse
               or both, or any events or circumstances that may give rise
               to a Event of Default or event that would constitute an
               Event of Default but for the requirement that notice be
               given or time elapse or both, or with respect to presenting
               claims in, monitoring or otherwise participating in any
               bankruptcy, insolvency or other similar proceeding affecting
               creditors' rights generally and any proceeding ancillary
               thereto).  The Borrower further agrees to pay on demand all
               out-of-pocket costs and expenses of the Bank in connection
               with the enforcement of this Agreement, the Note and the
               other documents to be delivered hereunder, whether in
               action, suit, litigation, any bankruptcy, insolvency or
               other similar proceeding affecting creditors' rights
               generally or otherwise (including, without limitation, the
<PAGE>









               reasonable fees and expenses of counsel for the Bank with
               respect thereto) and expenses in connection with the
               enforcement of rights under this Section 6.04(a).

                        (b)  If any payment of principal of any Eurodollar
               Rate Advance is made by the Borrower other than on the last
               day of the Interest Period for such Advance, as a result of
               a payment or Conversion pursuant to Section 1.11 or 1.13,
               acceleration of the maturity of the Advances and the Note
               pursuant to Section 5.01 or for any other reason, the
               Borrower shall, upon demand, pay to the Bank any amounts
               required to compensate the Bank for any additional losses, 
               costs or expenses which it may reasonably incur as a result
               of such payment, including, without limitation, any loss,
               cost or expense incurred by reason of the liquidation or
               reemployment of deposits or other funds acquired by the Bank
               to fund or maintain such Advance.

                        (c)  The Borrower agrees to indemnify and hold
               harmless the Bank and each of its affiliates and their
               officers, directors, employees, agents and advisors (each,
               an "Indemnified Party") from and against any and all claims,
               damages, losses, liabilities and expenses (including,
               without limitation, reasonable fees and expenses of counsel)
               that may be incurred by or asserted or awarded against any
               Indemnified Party, in each case arising out of or in
               connection with or by reason of (or in connection with the
               preparation for a defense of) any investigation, litigation
               or proceeding arising out of, related to or in connection
               with this Agreement and the transactions contemplated
               hereby, whether or not an Indemnified Party is a party
               thereto, whether or not the transactions contemplated hereby
               are consummated and whether or not any such claim,
               investigation, litigation or proceeding is brought by the
               Borrower or any other person, except (i) to the extent such
               claim, damage, loss, liability or expense (x) is found in a
               final, non-appealable judgment by a court of competent
               jurisdiction (a "Final Judgment") to have resulted from such
               Indemnified Party's gross negligence or willful misconduct
               or (y) arises from any legal proceedings commenced against
               any Lender by any other Lender (in its capacity as such and
               not as Agent), and (ii) in the case of any litigation
               brought by the Borrower (A) seeking a judgment against any
               Indemnified Party for any wrongful act or omission of such
               Indemnified Party and (B) in which a Final Judgment is
               rendered in the Borrower's favor against such Indemnified
               Party, the provisions of this paragraph will not be
               available to provide indemnification for any damage, loss,
<PAGE>









               liability or expense incurred by such Indemnified Party in
               connection with such litigation described in clause (i) or
               (ii) of this Section 6.04(c).

                        SECTION 6.05.  Right of Set-off.  Upon the
               occurrence and during the continuance of any Event of
               Default, the Bank is hereby authorized at any time and from
               time to time, to the fullest extent permitted by law, to set
               off and apply any and all deposits (general or special, time
               or demand, provisional or final) at any time held and other
               indebtedness at any time owing by the Bank to or for the
               credit or the account of the Borrower against any and all of
               the obligations of the Borrower to the Bank now or hereafter
               existing under this Agreement and the Note, whether or not 
               the Bank shall have made any demand under this Agreement or
               the Note and although such obligations may be unmatured. 
               The Bank agrees promptly to notify the Borrower after any
               such set-off and application, provided that the failure to
               give such notice shall not affect the validity of such
               set-off and application.  The rights of the Bank under this
               Section are in addition to other rights and remedies
               (including, without limitation, other rights of set-off)
               which the Bank may have.

                        SECTION 6.06.  Binding Effect.  (a)  This Agreement
               shall be binding upon and inure to the benefit of the
               Borrower and the Bank and their respective successors and
               assigns, except that the Borrower shall not have the right
               to assign its rights hereunder or any interest herein
               without the prior written consent of the Bank.

                        (b)  Notwithstanding any other provision set forth
               in this Agreement, the Bank may at any time create a
               security interest in all or any portion of its rights under
               this Agreement (including, without limitation, the Advances
               owing to it and the Note held by it) in favor of any Federal
               Reserve Bank in accordance with Regulation A of the Board of
               Governors of the Federal Reserve System.

                        SECTION 6.07.  Governing Law.  (a) This Agreement
               and the Note shall be governed by, and construed in
               accordance with, the laws of the State of New York.

                        (b)  The Borrower hereby irrevocably and
               unconditionally submits, for itself and its property, to the
               nonexclusive jurisdiction of any New York State court or
               Federal court of the United States of America sitting in New
               York City, and any appellate court thereof, in any action or
<PAGE>









               proceeding arising out of or relating to this Agreement, or
               for recognition or enforcement of any judgment, and each of
               the parties hereto hereby irrevocably and unconditionally
               agrees that all claims in respect of any such action or
               proceeding may be heard and determined in such New York
               State or, to the extent permitted by law, in such Federal
               court.  Each of the parties hereto agrees that a final
               judgment in any such action or proceeding shall be
               conclusive and may be enforced in other jurisdictions by
               suit on the judgment or in any other manner provided by law. 
               Subject to the foregoing and to paragraph (c) below, nothing
               in this Agreement shall affect any right that any party
               hereto may otherwise have to bring any action or proceeding
               relating to this Agreement against any other party hereto in
               the courts of any jurisdiction.

                        (c)  The Borrower hereby irrevocably and
               unconditionally waives, to the fullest extent it may legally
               and effectively do so, any objection which it may now or
               hereafter have to the laying of venue of any suit, action or
               proceeding arising out of or relating to this Agreement in
               any New York State or Federal court and the defense of an
               inconvenient forum to the maintenance of such action or
               proceeding in any such court.

                        (d)  The Borrower agrees that service of process
               may be made on the Borrower by personal service of a copy of
               the summons and complaint or other legal process in any such
               suit, action or proceeding, or by registered or certified
               mail (postage prepaid) to the address of the Borrower
               specified in Section 6.02, or by any other method of service
               provided for under the applicable laws in effect in the
               State of New York.

                        SECTION 6.08.  WAIVER OF JURY TRIAL.  EACH OF THE
               BORROWER AND THE BANK IRREVOCABLY WAIVES ALL RIGHT TO TRIAL
               BY JURY IN ANY ACTION, PROCEEDING OR COUNTERCLAIM (WHETHER
               BASED ON CONTRACT, TORT OR OTHERWISE) ARISING OUT OF OR
               RELATING TO ANY OF THIS AGREEMENT, THE NOTE, THE ADVANCES OR
               THE ACTIONS OF THE BANK IN THE NEGOTIATION, ADMINISTRATION,
               PERFORMANCE OR ENFORCEMENT THEREOF.

                        SECTION 6.09.  Execution in Counterparts.  This
               Agreement may be executed in any number of counterparts and
               by different parties hereto in separate counterparts, each
               of which when so executed shall be deemed to be an original
               and all of which taken together shall constitute one and the
               same agreement.  Delivery of an executed counterpart of a
<PAGE>









               signature page to this Agreement by telecopier shall be
               effective as delivery of a manually executed counterpart of
               this Agreement.

                        IN WITNESS WHEREOF, the parties hereto have caused
               this Agreement to be executed by their respective officers
               thereunto duly authorized, as of the date first above
               written.

                              NATIONAL HEALTH LABORATORIES INCORPORATED


                              By: /s/ JAMES R. MAHER        
                                   James R. Maher
                                   President and Chief Executive Officer



          Domestic Lending Office:           CITICORP USA, INC.
          399 Park Avenue
          New York, New York  10043

          Eurodollar Lending Office:         By: /s/Townsend U. Weekes, Jr.
          399 Park Avenue                         Authorized Representative
          New York, New York  10043
<PAGE>









                                     EXHIBIT A

                                  PROMISSORY NOTE

          $50,000,000                           Dated: April 7, 1994

                   FOR VALUE RECEIVED, the undersigned, National Health
          Laboratories Incorporated, a Delaware corporation (the
          "Borrower"), HEREBY PROMISES TO PAY to the order of Citicorp
          USA Inc. (the "Bank") for the account of its Applicable
          Lending Office (as defined in the Credit Agreement referred to
          below) the principal amount of $50,000,000 or, if less, the
          aggregate principal amount of all Advances made by the Bank to
          the Borrower pursuant to the Credit Agreement (as hereinafter
          defined) then outstanding on August 1, 1994.

                   The Borrower promises to pay interest on the
          principal amount of each Advance from the date of such Advance
          until such principal amount is paid in full, at such interest
          rates, and payable at such times, as are specified in the
          Credit Agreement referred to below.

                   Both principal and interest are payable in lawful
          money of the United States of America to the Bank at 399 Park
          Avenue, New York, New York 10043 in same day funds.  Each
          Advance made by the Bank to the Borrower and the maturity
          thereof, and all payments made on account of the principal
          amount thereof, shall be recorded by the Bank and, prior to
          any transfer hereof, endorsed on the grid attached hereto
          which is a part of this Promissory Note.

                   This Promissory Note is the Note referred to in, and
          is entitled to the benefits of, the Credit Agreement dated as
          of April   , 1994, as such Credit Agreement may hereafter be
          amended, modified or supplemented (the "Credit Agreement"),
          between the Borrower and the Bank.  The Credit Agreement,
          among other things, (i) provides for the making of advances
          (the "Advances") by the Bank to the Borrower from time to time
          in an aggregate amount not to exceed at any time outstanding
          the U.S. dollar amount first above mentioned, the indebtedness
          of the Borrower resulting from each such Advance being
          evidenced by this Promissory Note, and (ii) contains
          provisions for acceleration of the maturity hereof upon the
          happening of certain stated events and also for prepayments on
          account of principal hereof prior to the maturity hereof upon
          the terms and conditions therein specified.

                              NATIONAL HEALTH 
                              LABORATORIES INCORPORATED


                              By: /s/ JAMES R. MAHER          
                                   James R. Maher
                                   President and Chief Executive Officer
<PAGE>











                          ADVANCES AND PAYMENTS OF PRINCIPAL



                                 Amount of  
                   Amount of   Principal Paid  Unpaid Principal  Notation
          Date     Advance      or Prepaid         Balance       Made By  <PAGE>
 

























                                      EXHIBIT B
<PAGE>






                     NATIONAL HEALTH LABORATORIES INCORPORATED
                               4225 Executive Square
                            La Jolla, California 92037






                                             April 7, 1994



          To:  Citicorp USA, Inc.

          Ladies and Gentlemen:

                    I am Executive Vice President and General Counsel of
          National Health Laboratories Incorporated, a Delaware
          corporation (the "Borrower"), and am rendering this opinion in
          connection with the Credit Agreement dated as of April 7, 1994
          (the "Credit Agreement"), between the Borrower and Citicorp
          USA, Inc. (the "Bank").  I have made such investigations and
          examined such documents (including executed counterparts of
          the Credit Agreement and the Note referred to therein) and
          records, including certificates of certain officers of the
          Borrower and of certain public officials, as I have deemed
          necessary in order to express the opinions hereinafter set
          forth.  All capitalized terms used but not defined herein
          shall have the meanings set forth in the Credit Agreement.

                    Based upon and subject to the foregoing, I am of the
          opinion that:

                    1.   The Borrower is a corporation duly organized,
          validly existing and in good standing under the laws of the
          State of Delaware and has all requisite corporate power and
          authority to own or lease and operate its properties and to
          carry on its business as now conducted.  The Borrower is duly
          qualified and in good standing as a foreign corporation in
          each other jurisdiction in which it owns or leases property or
          in which the conduct of its business requires it to so qualify
          or be licensed except where the failure to so qualify or be
          licensed would not have a Material Adverse Effect (as defined
          in the Existing Credit Agreement).

                    2.   The Credit Agreement and the Note have been duly
          executed and delivered by the Borrower.

                    3.   The execution, delivery and performance by the
          Borrower of the Credit Agreement and the Note and the
          consummation of the transactions contemplated thereby are
          within the Borrower's corporate powers, have been duly
          authorized by all necessary corporate action, and do not
<PAGE>






          (i) contravene the Borrower's Restated Certificate of
          Incorporation or by-laws, (ii) conflict with or result in the
          breach of, or constitute a default under any loan agreement,
          material contract, indenture, mortgage, deed of trust, lease
          or other material instrument binding on or affecting the
          Borrower, any of its Subsidiaries or any of its or their
          properties, the effect of which is reasonably likely to have a
          Material Adverse Effect (as defined in the Existing Credit
          Agreement), (iii) result in or require the creation or
          imposition of any Lien (as defined in the Existing Credit
          Agreement) upon or with respect to any of the properties of
          the Borrower or any of its Subsidiaries under any agreement or
          instrument referred to in clause (ii) above or (iv) violate
          any order, writ, judgment, injunction, decree, determination
          or award binding upon the Borrower or any of its Subsidiaries
          or any of its or their respective properties or assets which
          violation would be reasonably likely to have a Material
          Adverse Effect (as defined in the Existing Credit Agreement).

                    4.   No authorization, approval or other action by,
          and no notice to, any governmental authority or regulatory
          body is required for the execution, delivery or performance by
          the Borrower of the Credit Agreement or the Note.

                    5.   To the best of my knowledge after due inquiry,
          there is no pending or threatened action, proceeding,
          governmental investigation or arbitration affecting the
          Borrower or any of its Subsidiaries before any court,
          governmental agency or arbitrator which (i) is reasonably
          likely to have a Material Adverse Effect (as defined in the
          Existing Credit Agreement) or (ii) purports to affect the
          legality, validity, binding effect or enforceability of the
          Credit Agreement or the Note.

                    I am a member of the bars of the States of Illinois
          and Indiana and do not express any opinion as to matters
          governed by any laws other than the Federal laws of the United
          States of America and the General Corporation Law of the State
          of Delaware.

                    I am aware that Shearman & Sterling will rely upon
          the opinions set forth herein in rendering their opinion to
          the Agent and the Lenders pursuant to the Credit Agreement.

                              Very truly yours,



                              By: /s/ JAMES G. RICHMOND                  
                                   James G. Richmond  
                                   Executive Vice President and
                                   General Counsel
<PAGE>



























                                     EXHIBIT C
<PAGE>









          April 7, 1994



          Citicorp USA, Inc.
          399 Park Avenue
          New York, New York 10043


          Ladies and Gentlemen:

                    We have acted as special New York counsel to National
          Health Laboratories Incorporated, a Delaware corporation (the
          "Borrower"), in connection with the execution and delivery of
          the Credit Agreement dated as of April 7, 1994 (the "Credit
          Agreement"), between the Borrower and Citicorp USA, Inc. (the
          "Bank").  Capitalized terms not otherwise defined herein shall
          have the meanings given them in the Credit Agreement.  This
          opinion is being furnished to you at the request of the
          Borrower pursuant to Section 2.01(iv) of the Credit Agreement.

                    In connection with this opinion, we have examined
          originals, or copies certified or otherwise identified to our
          satisfaction, of the following documents, each dated as of,
          and as in effect on, the date hereof (together, the
          "Documents"): 

                    1.   The Credit Agreement; and

                    2.   The Note.

                    In addition, we have examined:  (i) such corporate
          records of the Borrower as we have considered appropriate,
          including copies of the certificate of incorporation, as
          amended and restated, and by-laws of the Borrower certified as
          in effect on the date hereof (collectively, the "Charter
          Documents") and certified copies of resolutions of the board
          of directors of the Borrower; and (ii) such other
          certificates, agreements and documents as we deemed relevant
          and necessary as a basis for the opinions hereinafter
          expressed.

                    In our examination of the aforesaid documents, we
          have assumed, without independent investigation, the
          genuineness of all signatures, the enforceability of the
          Documents against each party thereto other than the Borrower,
          the authenticity of all documents submitted to us as
          originals, the conformity to the original documents of all
          documents submitted to us a certified, photostatic, reproduced
          or conformed copies of validly existing agreements or other
          documents and the authenticity of all such latter documents.
<PAGE>






                    In expressing the opinions set forth herein, we have
          relied upon the factual matters contained in the
          representations and warranties of the Borrower incorporated in
          the Credit Agreement by reference to the Existing Credit
          Agreement to the extent they address matters of fact and upon
          certificates of public officials and officers of the Borrower.

                    Based upon the foregoing, and subject to the
          assumptions, qualifications, limitations and exceptions set
          forth herein, we are of the opinion that:

                    1.   The Documents constitute the legal, valid and
          binding obligations of the Borrower enforceable against the
          Borrower in accordance with their terms.

                    2.   The execution, delivery and performance by the
          Borrower of the Documents and the consummation by the Borrower
          of the borrowings contemplated thereby do not contravene any
          existing law, rule or regulation of the United States
          (including without limitation, Regulation G, U, and X of the
          Board of Governors of the Federal Reserve System) or of the
          State of New York or the General Corporation Law of the State
          of Delaware (the "GCL").

                    3.   No authorization, approval or other action by,
          and no notice to, consent of, order of or filing with, any
          United States Federal, New York or, to the extent required
          under the GCL, Delaware governmental authority or regulatory
          body is required for the execution, delivery and performance
          by the Borrower of the Documents.

                    4.   The Documents have been duly executed and
          delivered by the Borrower.

                    The foregoing opinion is subject to the following
          additional assumptions, limitations, qualifications and
          exceptions:

                    (a)  The enforceability of the Documents may be
          (i) subject to bankruptcy, insolvency, reorganization,
          fraudulent conveyance or transfer, moratorium or other similar
          laws affecting creditors' rights generally, and (ii) subject
          to general principles of equity (whether considered in a
          proceeding at law or in equity); 

                    (b)  We express no opinion as to the enforceability
          of (i) any provisions contained in the Documents that purport
          to establish (or may be construed to establish) evidentiary
          standards, or (ii) the enforceability of forum selection
          clauses in the federal court; and

                    (c)  Insofar as provisions contained in the Documents
          provide for indemnification, the enforcement thereof may be
          limited by public policy considerations.
<PAGE>






                    Our opinions expressed above are limited to the laws
          of the State of New York, the GCL and the Federal laws of the
          United States.  Please be advised that no member of this firm
          is admitted to practice in the State of Delaware.  Our
          opinions are rendered only with respect to the laws, and the
          rules, regulations and orders thereunder, which are currently
          in effect.

                    This letter is furnished by us solely for your
          benefit in connection with the Credit Agreement and the
          transactions contemplated thereby and may not be circulated
          to, or relied upon by, any other Person, except that this
          letter may be circulated to any prospective assignee of the
          Bank and may be relied upon by any Person who, in the future,
          becomes an assignee of the Bank.

                    We are aware that Shearman & Sterling will rely upon
          the opinions set forth in this opinion in rendering their
          opinion to the Bank pursuant to the Credit Agreement.

                              Very truly yours,



                              PAUL, WEISS, RIFKIND, WHARTON & GARRISON
<PAGE>














                     NATIONAL HEALTH LABORATORIES INCORPORATED


                              Secretary's Certificate


                    Reference is made to the Credit Agreement dated as of
          April 7, 1994 between National Health Laboratories
          Incorporated (the "Company") and Citicorp USA, Inc. (the
          "Credit Agreement").  Capitalized terms used but not defined
          in this Certificate have the meanings assigned to such terms
          in the Credit Agreement.  This Certificate is being delivered
          pursuant to Sections 2.01 (ii) and (iii) of the Credit
          Agreement.

                    I, the undersigned, the Secretary of National Health
          Laboratories Incorporated, a corporation organized under the
          law of the State of Delaware (the "Company"), do hereby
          certify that:

                    1.  Attached hereto as Exhibit A is a true, correct
               and complete copy of certain resolutions duly adopted by
               unanimous written consent in lieu of a meeting of the
               Board of Directors of the Company (the "Board of
               Directors") on February 8, 1989 and July 3, 1990.  Except
               for resolutions regarding the appointment of committee
               members, said resolutions have not been amended, annulled,
               rescinded or revoked and are in full force and effect and
               there exist no other resolutions of the Board of Directors
               relating to the matters set forth in the resolutions
               attached hereto.  There is no provision in the certificate
               of incorporation or by-laws of the Company limiting the
               power of the Board of Directors to pass the resolutions
               attached hereto, and the same are in conformity with the
               provisions of such certificate of incorporation and
               by-laws.

                    2.  Attached hereto as Exhibit B is a true, correct
               and complete copy of resolutions duly adopted by unanimous
               written consent in lieu of a meeting of the Executive
               Committee of the Board of Directors of the Company (the
               "Executive Committee") on April 1, 1994, approving the
               Credit Agreement and the Note.  Said resolutions have not
               been amended, annulled, rescinded or revoked and are in
               full force and effect.  There exist no other resolutions
               of the Executive Committee relating to the matters set
<PAGE>






               forth in the resolutions attached hereto.  There is no
               provision in the certificate of incorporation or by-laws
               of the Company limiting the power of the Executive
               Committee to pass the resolutions attached hereto, and the
               same are in conformity with the provisions of such
               certificate of incorporation and by-laws.

                    3.  The current members of the Executive Committee
               are Ronald O. Perelman, Howard Gittis and James R. Maher.

                    4.  The persons listed below have been duly elected
               or appointed, have been duly qualified and on the date of
               this Certificate are officers of the Company, holding the
               respective offices set forth below opposite their names,
               and the signatures set forth opposite their names are
               genuine:

               NAME                OFFICE           SIGNATURE

          James R. Maher  President and 
                          Chief Executive 
                          Officer                 By: /s/ JAMES R. MAHER        
                                                      James R. Maher

          Michael L. Jeub Executive Vice 
                          President, Chief 
                          Financial Officer 
                          and Treasurer           By: /s/ MICHAEL L. JEUB       
                                                      Michael L. Jeub 



          Alvin Ezrin     Secretary               By: /s/ ALVIN EZRIN           
                                                      Alvin Ezrin

             Each of the foregoing officers is authorized (a) to sign on
          behalf of the Company each document with respect to which this
          Certificate is being delivered (and each document referred to
          therein or contemplated thereby) and (b) to act as a representative
          of the Company for the purposes of signing such documents and
          giving notices and other communications in connection therewith and
          the transactions contemplated thereby. <PAGE>
 






                IN WITNESS WHEREOF, I have hereunto set my hand as Secretary
         of the Company this 7th day of April, 1994.


                                        By: /s/ ALVIN EZRIN           
                                             Alvin Ezrin
                                             Secretary <PAGE>
 






         I, the undersigned, Executive Vice President, Chief Financial
     Officer and Treasurer of the Company, do hereby certify that Alvin Ezrin
     has been duly elected or appointed, has duly qualified and this day is
     the Secretary of the Company, and that the signature above is genuine.

         IN WITNESS WHEREOF, I have hereunto set my hand as Executive
      Vice President, Chief Financial Officer and Treasurer of the Company
      this 7th day of April, 1994.


                                        By: /s/ MICHAEL L. JEUB       
                                             Michael L. Jeub 
                                             Executive Vice President, Chief
                                             Financial Officer and Treasurer <PAGE>
 





                                                                 Exhibit A






                          National Health Laboratories Incorporated


                           Action by Unanimous Written Consent of
                            Board of Directors in Lieu of Meeting


          February 8, 1989

          Creation of Executive Committee

                    RESOLVED, that there be, and hereby is, constituted an
               Executive Committee of the Board of Directors, said committee
               to have all of the power and authority of the full Board of
               Directors not inconsistent with the Delaware General
               Corporation Law, or the Certificate of Incorporation or By-
               Laws of the Corporation, as any of the same may be amended
               from time to time, and Ronald O. Perelman, Donald G. Drapkin,
               Howard Gittis, Sol Levine and Bruce Slovin be, and each of
               them hereby is, elected to office as a member of the Executive
               Committee to serve at the pleasure of the Board of Directors,
               with Mr. Perelman to serve as chairman of such committee.


          July 3, 1990

                    RESOLVED, that this Board of Directors hereby reaffirms
               the constitution of the Executive Committee of the Board of
               Directors and the continuation of Ronald O. Perelman,
               Donald G. Drapkin, Howard Gittis, Sol Levine and Bruce Slovin
               as the members thereof with Mr. Perelman to serve as chairman
               of such committee, and that this Board of Directors hereby
               reaffirms that the Executive Committee of the Board of
               Directors shall have all of the power and authority of the
               full Board of Directors consistent with the Certificate of
               Incorporation and By-Laws of the Corporation and the General
               Corporation Law of the State of Delaware, as the same may be
               amended from time to time, and that such power and authority
               shall include, but not be limited to, declaration of
               dividends, authorization of the issuance of stock of the
               Corporation and adoption of certificates of ownership and
               merger pursuant to Section 253 of the Delaware General
               Corporation Law.
<PAGE>






                                                                   Exhibit B





               RESOLVED, that the Corporation be, and it hereby is,
     authorized to enter into a Credit Agreement by and between the
     Corporation and Citibank, N.A., providing for a $50,000,000 revolving
     credit facility, substantially in the form of the draft thereof dated
     March 24, 1994, with such changes therein and additions thereto as may
     be approved or deemed necessary, appropriate or advisable by the officer
     executing the same, the execution thereof by such officer to be
     conclusive evidence of such approval or determination (the "Credit
     Agreement");

               RESOLVED, that the Corporation be, and it hereby is,
     authorized to enter into a Promissory Note pursuant to its obligations
     under the Credit Agreement, substantially in the form of the draft
     attached thereto as an exhibit, with such changes therein and additions
     thereto as may be approved or deemed necessary, appropriate or advisable
     by the officer executing the same, the execution thereof by such officer
     to be conclusive evidence of such approval or determination (the
     "Note");

               FURTHER RESOLVED, that any officer of the Corporation be, and
     each of them individually hereby is, authorized in the name and on
     behalf of the Corporation, to execute and deliver the Credit Agreement
     and the Note (the "Principal Documents") and any other agreements
     related thereto or required thereby containing such terms and
     conditions, setting forth such rights and obligations and otherwise
     addressing or dealing with such subjects or matters determined to be
     necessary, appropriate or advisable by the officer executing the same,
     the execution thereof by such officer to be conclusive evidence of such
     determination, and to do all such other acts or deeds as are or as are
     deemed by such officer to be necessary, appropriate or advisable to
     effectuate the intent, purposes and matters reasonably contemplated or
     implied by this resolution and the foregoing resolutions;

               FURTHER RESOLVED, that the Corporation be, and it hereby is,
     authorized to perform fully its obligations under the Principal
     Documents and any such other agreements and to engage without limitation
     in such other transactions, arrangements or activities (collectively,
     the "Activities") as are reasonably related or incident to or which will
     serve to facilitate or enhance for the benefit of the Corporation the
     transactions contemplated by these resolutions, including without
     limitation any modification, extension or expansion (collectively, the
     "Changes") of any of the Activities or of any other transactions,
     arrangements or activities resulting from any of the Changes and to
     enter into such other agreements or understandings as are necessary,
     appropriate or advisable to effectuate the intent, purpose and matters
     reasonably contemplated or implied by this resolution and each of the
     foregoing resolutions; <PAGE>
 





            FURTHER RESOLVED, that any officer of the Corporation be, and
     each of them individually hereby is, authorized in the name and on
     behalf of the Corporation, to perform all such acts and execute and
     deliver all such agreements, documents and instruments and pay any and
     all fees in connection therewith as any of them shall deem necessary,
     appropriate or advisable to effectuate the intent and purposes of the
     foregoing resolutions, such determination to be conclusively evidenced
     by the performance of such acts, the execution and delivery of such
     agreements, documents and instruments and the payment of any such fees;
     and

             FURTHER RESOLVED, that all actions previously taken by any
      director, officer, employee or agent of the Corporation in connection
      with or related to the matters set forth in or reasonably contemplated
      or implied by the foregoing resolutions be, and each of them hereby is
      adopted, ratified, confirmed and approved in all respects as the acts
      and deeds of the Corporation. <PAGE>
 















                          NATIONAL HEALTH LABORATORIES INCORPORATED


                                    Officers' Certificate


                 Reference is made to the Credit Agreement (the "Credit
       Agreement") dated as of April 7, 1994 between National Health
       Laboratories Incorporated (the "Company") and Citicorp USA, Inc. 
       Capitalized terms used but not defined in this Certificate have the
       meanings assigned to such terms in the Credit Agreement.  This
       Certificate is being delivered pursuant to Section 2.01(vi) of the
       Credit Agreement.

                 The undersigned hereby certify as follows:

                1.   The representations and warranties contained in Section
       4.01 of the Existing Credit Agreement are correct in all material
       respects on and as of the date hereof, as though made on and as of the
       date hereof.  

                 2.   No event has occurred or is continuing which constitutes
       a "Default" under the Existing Credit Agreement.   <PAGE>
 





                 IN WITNESS WHEREOF, the undersigned have executed and
       delivered this Certificate on behalf of the Company, and in their
       respective capacities as Executive Vice President, Chief Financial
       Officer and Treasurer and Secretary of the Company, this 7th day of
       April, 1994.



                                        NATIONAL HEALTH LABORATORIES
                                        INCORPORATED


                                        By: /s/ MICHAEL L. JEUB       
                                             Michael L. Jeub 
                                             Executive Vice President, Chief
                                             Financial Officer and Treasurer




                                        By: /s/ ALVIN EZRIN           
                                             Alvin Ezrin
                                             Secretary
<PAGE>





                                                                 EXHIBIT 20





               FOR IMMEDIATE RELEASE


                            NATIONAL HEALTH LABORATORIES SIGNS
                                DEFINITIVE MERGER AGREEMENT
                             WITH ALLIED CLINICAL LABORATORIES

                 NHL to Make All-Cash Offer for All Outstanding Common 
                    Shares, At $23 Per Share                                   

                 NHL Authorizes New Stock Repurchase Program and Discontinues
                    Dividend



                    La Jolla, CA, May 4, 1994 -- National Health
               Laboratories Incorporated (NYSE: NH) and Allied Clinical
               Laboratories, Inc. (NASDAQ: ACLB) announced today that they
               have entered into a definitive agreement for NHL to acquire
               Allied.  Under the agreement, which was unanimously approved
               by the Boards of Directors of both companies, a subsidiary
               of NHL will commence a cash tender offer for all shares of
               Allied common stock for $23 per share.  Any shares not
               tendered and purchased in the offer will be exchanged for
               $23 in cash in a second-step merger.  Allied has
               approximately 8,400,000 shares outstanding.
                    The offer and the merger are subject, among other
               things, to the purchase in the offer of 4,845,000 Allied
               shares and the expiration of all waiting periods under the
               Hart-Scott-Rodino Antitrust Improvements Act.  The offer is
               not subject to financing, a commitment for which has been
               obtained from Citibank.  It is currently intended that the
               offer will commence on Monday, May 9.
                    "We are extremely pleased that we have reached an
               agreement with Allied," said James R. Maher, Chief Executive
               Officer of NHL.  "This transaction will strengthen NHL's
               competitive position in the consolidating clinical lab
               testing industry.  The merger will broaden our presence in <PAGE>
 


               <PAGE>2



               

               the marketplace, deepen our penetration of the managed-care
               and hospital segments of our business and achieve greater
               operating efficiencies.  In our industry, firms with a
               national presence and economies of scale are best prepared
               to take advantage of long-term growth opportunities. 
               Clearly, the merger with Allied will help us achieve this
               objective."
                    Mr. Maher also said that it is anticipated that
               Haywood D. Cochrane, Jr., Allied's President and Chief
               Executive Officer, will become NHL's Vice Chairman when the
               transaction is completed.  "We are gratified that Haywood
               has agreed to join the new company," Mr. Maher said. 
               "Initially, he will be responsible for integrating the
               operations of the two companies and for NHL's ongoing
               acquisition program.  Haywood offers a tremendous depth of
               experience in the laboratory business and will be invaluable
               to us as we work together and continue building one of the
               outstanding companies in the business."
                    Mr. Cochrane said, "We believe this transaction offers
               our shareholders fair value for their Allied investment. 
               Further, joining the strengths of Allied and NHL will give
               the new company a significantly improved position in the
               marketplace and enhance our ability to offer high-quality,
               sophisticated testing services at competitive pricing."


               NHL Discontinues Dividend To Support Acquisition Strategy

               In order to increase its flexibility with regard to both its
               acquisition strategy and stock repurchase program, NHL also
               said it is discontinuing divided payments for the
               foreseeable future.  The company will terminate its current
               10 million share repurchase program, under which the
               company, to date, has repurchased 7.8 million shares, and <PAGE>
 


               <PAGE>3



               

               will establish a new $50 million stock repurchase program
               through which NHL will acquire additional shares of the
               company's common stock from time to time on the open market.
                    "Our acquisition program continues to play a
               significant role in our overall growth strategy," said
               Mr. Maher.  "We believe that the elimination of the dividend
               is a sound strategic move.  It will help us acquire other
               high-quality clinical laboratory companies that will help
               open new markets for NHL and solidify our position in
               existing ones.  At the same time, we will have greater
               latitude with which to pursue a major stock repurchase
               program."
                    NHL also announced that it has entered into agreements
               with Mr. Cochrane and Warburg, Pincus Capital Company, L.P.,
               under which NHL has the option to purchase from such
               stockholders an aggregate amount of approximately 2,751,000
               shares of Allied common stock at $23 per share.
                    NHL's financial advisor is Morgan Stanley & Co.
               Incorporated, which will act as the dealer manager for the
               offer.  Alex. Brown & Sons Incorporated is acting as the
               financial advisor for Allied.
                    NHL had 1993 net sales of $760.5 million.  The company
               owns and operates 15 regional laboratories and an esoteric
               reference laboratory in Nashville, which offers highly
               specialized tests to hospitals and other providers.  NHL is
               one of the leading clinical laboratory companies in the
               United States, providing testing services primarily to
               physicians as well as to hospitals, clinics, nursing homes
               and other clinical laboratories in 44 states.
                    Allied had 1993 sales of $163.0 million.  Allied
               provides testing services to physicians, hospitals, clinics
               and other health care providers through a national network
<PAGE>



               <PAGE>4



               

               of 12 regional laboratories, one of which services as a
               reference laboratory and one of which services as an
               anatomical testing laboratory.  The company supports its
               regional laboratories through approximately 230 other
               services sites.  Through its Contract Management Services
               Division, the company has contracted with approximately 70
               health care entities, including multispecialty clinics,
               PPO networks and a staff model IIMO to provide a variety of
               management services for their on-site laboratories,
               including both clinical and anatomical testing as well as
               pathology consultation and laboratory direction.


                                           # # #


               CONTACT:  National Health laboratories
                         Walter G. Montgomery
                         212-484-6721

                         Allied Clinical Laboratories
                         Gerard M. Hayden, Jr.
                         615-320-2648
<PAGE>





                                                              EXHIBIT 99(A)
                                                             CONFORMED COPY




                                   STOCK OPTION AGREEMENT dated as of
                              May 3, 1994, among NATIONAL HEALTH
                              LABORATORIES INCORPORATED, a Delaware
                              corporation ("Parent"), N ACQUISITION CORP.,
                              a Delaware corporation (the "Purchaser"), and
                              WARBURG, PINCUS CAPITAL COMPANY, L.P., a
                              Delaware limited partnership (the
                              "Stockholder").


                         WHEREAS Parent, the Purchaser and Allied Clinical
               Laboratories, Inc., a Delaware corporation (the "Company"),
               propose to enter into an Agreement and Plan of Merger of
               even date herewith (the "Merger Agreement") providing for
               the making of a cash tender offer (the "Offer") by the
               Purchaser for shares of Common Stock, par value $.01 per
               share, of the Company (the "Common Stock") and the merger of
               the Company and the Purchaser (the "Merger"); 

                         WHEREAS the Stockholder owns in the aggregate
               2,504,042 shares of Common Stock (the "Optioned Shares");
               and 

                         WHEREAS, as a condition to their willingness to
               enter into the Merger Agreement, Parent and the Purchaser
               have required that the Stockholder agree to grant the
               Purchaser an irrevocable option, as set forth herein, to
               purchase all the Optioned Shares; 

                         NOW, THEREFORE, to induce Parent and the Purchaser
               to enter into, and in consideration of their entering into,
               the Merger Agreement, and in consideration of the premises
               and the representations, warranties and agreements herein
               contained, the parties agree as follows:

                         1.  Grant of Option.  The Stockholder hereby
               grants the Purchaser an irrevocable option (the "Option") to
               purchase for $23 per share in cash (the "Per Share Price")
               all the Optioned Shares.  The Option shall not become
               exercisable and shall expire on May 10, 1994, if the Offer
               is not commenced by May 10, 1994 for any reason other than
               that referred to in clause (i) below.  The Option shall
               expire (if not theretofore exercised) (i) if the Offer is
               not commenced by May 10, 1994, as a result of the failure of
               any of the conditions set forth in paragraphs (a) through
               (h) of Exhibit A to the Merger Agreement, on June 9, 1994,
               or (ii) if the Offer is so commenced, 30 trading
               days following termination of the Offer, whether or not
<PAGE>



               <PAGE>2



               

               shares of Common Stock shall have been accepted for payment
               by the Purchaser (or Parent or any other person who is
               authorized by Parent) pursuant to the Offer; provided that,
               if the Option cannot be exercised on any such date because
               the waiting period under the Hart-Scott-Rodino Antitrust
               Improvements Act of 1976 (the "HSR Act") with respect to the
               exercise of the Option shall not have expired or been
               terminated or because of any injunction, order or similar
               restraint by a court of competent jurisdiction, the Option
               shall expire on the fifth trading day after such waiting
               period shall have expired or been terminated or such
               injunction, order or restraint shall have been dissolved or
               when such injunction, order or restraint shall have become
               permanent and no longer subject to appeal, as the case may
               be.  A "trading day" shall be any date on which the New York
               Stock Exchange shall be open for business.

                         2.  Exercise of Option.  

                         (a)  Provided that (i) the waiting period under
               the HSR Act with respect to the exercise of the Option shall
               have expired or been terminated and (ii)(A) as a result of
               the failure of any of the conditions set forth in
               paragraphs (a) through (h) of Exhibit A to the Merger
               Agreement, the Purchaser shall have failed to commence the
               Offer by May 10, 1994, or (B) the Offer, having been so
               commenced, has been terminated, whether or not shares of
               Common Stock shall have been accepted for payment by the
               Purchaser (or Parent or any other Person who is authorized
               by Parent) pursuant to the Offer, then the Purchaser may
               exercise the Option at any time in whole prior to the
               expiration of the Option.  In the event that the Purchaser
               wishes to exercise the Option, the Purchaser shall do so by
               giving written notice (the date of such notice being herein
               called the "Notice Date") to the Stockholder specifying the
               place, time and date not earlier than two trading days, nor
               later than 10 trading days, from the Notice Date for the
               closing of the purchase by the Purchaser pursuant to such
               exercise.

                         (b)  In the event that any share of Common Stock
               is accepted for payment and paid for by the Purchaser (or
               Parent or any other person who is authorized by Parent)
               pursuant to the Offer, the Purchaser shall be obligated to
               exercise the Option in whole (with respect to the Optioned
               Shares not theretofore accepted for payment and paid for
               pursuant to the Offer) no later than five trading days
               following the date of such payment; provided, however, that
<PAGE>



               <PAGE>3



               

               if the waiting period under the HSR Act with respect to the
               exercise of the Option shall not have expired or been
               terminated or any injunction, order or similar restraint by
               a court of competent jurisdiction shall exist, in each case
               on such fifth trading day, then, notwithstanding the
               foregoing, the Purchaser shall be obligated to exercise the
               Option in whole not later than five trading days after such
               waiting period shall have expired or been terminated or such
               injunction, order or restraint shall have been dissolved.

                         3.  Payment of Purchase Price and Delivery of
               Certificates for Optioned Shares.  At any closing of the
               exercise of the Option hereunder, (i) the Purchaser will
               deliver to the Stockholder a certified or official bank
               check payable to the order of the Stockholder in New York
               Clearing House funds in an amount equal to the product of
               the Per Share Price and the number of Optioned Shares being
               purchased at such closing and (ii) the Stockholder shall
               deliver to the Purchaser certificates representing the
               Optioned Shares sold by the Stockholder to the Purchaser at
               such closing, duly endorsed in blank or accompanied by stock
               powers duly executed by the Stockholder in blank, in proper
               form for transfer.

                         4.  Representations and Warranties of the
               Stockholder.  The Stockholder hereby represents and warrants
               to Parent and the Purchaser as follows:

                         (a)  Authority; Noncontravention.  The Stockholder
                    has all requisite power and authority to enter into
                    this Agreement and to consummate the transactions
                    contemplated hereby.  The execution and delivery of
                    this Agreement by the Stockholder and the consummation
                    by the Stockholder of the transactions contemplated
                    hereby have, in the case of each Stockholder that is
                    not a natural person, been duly authorized by all
                    necessary partnership action on the part of the
                    Stockholder.  This Agreement has been duly executed and
                    delivered by the Stockholder and constitutes a valid
                    and binding obligation of the Stockholder, enforceable
                    against the Stockholder in accordance with its terms. 
                    The execution and delivery of this Agreement do not,
                    and the consummation of the transactions contemplated
                    hereby and compliance with the terms hereof will not,
                    conflict with, or result in any violation of, or
                    default (with or without notice or lapse of time or
                    both) under (i) with respect to Stockholders that are
                    not natural persons, the certificate of incorporation
<PAGE>



               <PAGE>4



               

                    or by-laws or any other comparable charter or
                    organizational documents of the Stockholder or (ii) any
                    provision of any trust agreement, loan or credit
                    agreement, note, bond, mortgage, indenture, lease or
                    other agreement, instrument, permit, concession,
                    franchise, license, judgment, order, decree, statute,
                    law, ordinance, rule or regulation applicable to the
                    Stockholder or to the Stockholder's property or assets,
                    other than, in the case of clause (ii), any such
                    conflicts, violations, defaults, rights or liens that
                    individually or in the aggregate would not (x) impair
                    the ability of the Stockholder to perform its
                    obligations under this Agreement or (y) prevent the
                    consummation of any of the transactions contemplated by
                    this Agreement.  No consent, approval, order or
                    authorization of, or registration, declaration or
                    filing with, any Federal, state or local government or
                    any court, administrative or regulatory agency or
                    commission or other governmental authority or agency,
                    domestic or foreign (a "Governmental Entity"), is
                    required by or with respect to the Stockholder in
                    connection with the execution and delivery of this
                    Agreement or the consummation by the Stockholder of the
                    transactions contemplated by this Agreement, except for
                    (1) the filing with the Securities and Exchange
                    Commission of such reports under Sections 13(d) and
                    16(a) of the Securities Exchange Act of 1934, as
                    amended, as may be required in connection with this
                    Agreement and the transactions contemplated by this
                    Agreement and (2) such other consents, approvals,
                    orders, authorizations, registrations, declarations and
                    filings as would not individually or in the aggregate
                    prevent the consummation of any of the transactions
                    contemplated by this Agreement. 

                         (b)  The Optioned Shares.  The Stockholder has,
                    and the transfer by the Stockholder of the Optioned
                    Shares hereunder will pass to the Purchaser, good and
                    marketable title to the Optioned Shares, free and clear
                    of any claims, liens, encumbrances, security interests,
                    voting restrictions and limitations on disposition
                    whatsoever.  The Stockholder does not directly or
                    indirectly own, either beneficially or of record, any
                    shares of Common Stock other than the Optioned Shares.
<PAGE>



               <PAGE>5



               

                         5.  Representations and Warranties of Parent and
               the Purchaser.  Parent and the Purchaser hereby represent
               and warrant to the Stockholder as follows:

                         (a)  Authority; Noncontravention.  Parent and the
                    Purchaser have all requisite corporate power and
                    authority to enter into this Agreement and to
                    consummate the transactions contemplated by this
                    Agreement.  The execution and delivery of this
                    Agreement and the consummation of the transactions
                    contemplated by this Agreement have been duly
                    authorized by all necessary corporate action on the
                    part of Parent and the Purchaser.  This Agreement has
                    been duly executed and delivered by Parent and the
                    Purchaser and constitutes a valid and binding
                    obligation of each such party, enforceable against each
                    such party in accordance with its terms.  The execution
                    and delivery of this Agreement do not, and the
                    consummation of the transactions contemplated by this
                    Agreement and compliance with the provisions of this
                    Agreement will not, conflict with, or result in any
                    violation of, or default (with or without notice or
                    lapse of time, or both) under, or give rise to a right
                    of termination, cancellation or acceleration of any
                    obligation or to loss of a material benefit under, or
                    result in the creation of any lien upon any of the
                    properties or assets of Parent or any of its
                    subsidiaries under, (i) the certificate of
                    incorporation or by-laws of Parent or the Purchaser or
                    the comparable charter or organizational documents of
                    any other subsidiary of Parent, (ii) any loan or credit
                    agreement, note, bond, mortgage, indenture, lease or
                    other agreement, instrument, permit, concession,
                    franchise or license applicable to Parent or any of its
                    subsidiaries or their respective properties or assets
                    or (iii) subject to the governmental filings and other
                    matters referred to in the following sentence, any
                    judgment, order, decree, statute, law, ordinance, rule
                    or regulation applicable to Parent or any of its
                    subsidiaries or their respective properties or assets,
                    other than, in the case of clause (ii) or (iii), any
                    such conflicts, violations, defaults, rights or liens
                    that individually or in the aggregate would not
                    (x) have a material adverse effect (as such term is
                    defined in the Merger Agreement) on Parent, (y) impair
                    the ability of Parent and the Purchaser to perform
                    their respective obligations under this Agreement or
                    (z) prevent the consummation of any of the transactions
<PAGE>



               <PAGE>6



               

                    contemplated by this Agreement.  No consent, approval,
                    order or authorization of, or registration, declaration
                    or filing with, any Governmental Entity is required by
                    or with respect to Parent or any of its subsidiaries in
                    connection with the execution and delivery of this
                    Agreement or the consummation by Parent or the
                    Purchaser of any of the transactions contemplated by
                    this Agreement, except for (1) filings under the HSR
                    Act, if applicable, (2) the filing with the Securities
                    and Exchange Commission of such reports under
                    Sections 13(a), 13(d) and 16(a) of the Securities
                    Exchange Act of 1934, as amended, as may be required in
                    connection with this Agreement and the transactions
                    contemplated by this Agreement and (3) such other
                    consents, approvals, orders, authorizations,
                    registrations, declarations and filings as would not
                    individually or in the aggregate (A) have a material
                    adverse effect on Parent or (B) prevent the
                    consummation of any of the transactions contemplated by
                    this Agreement.

                         (b)  Securities Act.  Any Optioned Shares
                    purchased by the Purchaser pursuant to this Agreement
                    will be acquired for investment only and not with a
                    view to any public distribution thereof, and the
                    Purchaser will not offer to sell or otherwise dispose
                    of any Optioned Shares so acquired by it in violation
                    of any of the registration requirements of the
                    Securities Act of 1933, as amended.

                         6.  Distributions; Adjustment upon Changes in
               Capitalization.  (a)  Any dividends or other distributions
               (whether payable in cash, stock or otherwise) by the Company
               with respect to any Optioned Shares purchased hereunder with
               a record date on or after the date of the closing of such
               purchase will belong to the Purchaser.  If any such dividend
               or distribution belonging to the Purchaser is paid by the
               Company to the Stockholder, the Stockholder shall hold such
               dividend or distribution in trust for the benefit of the
               Purchaser and shall promptly remit such dividend or
               distribution to the Purchaser in exactly the form received,
               accompanied by appropriate instruments of transfer.

                         (b)  If on or after the date of this Agreement
               there shall occur any stock dividend, stock split,
               recapitalization, combination or exchange of shares, merger,
               consolidation, reorganization or other change or transaction
               of or by the Company, as a result of which shares of any
<PAGE>



               <PAGE>7



               

               class of stock, other securities, cash or other property
               shall be issued in respect of any Optioned Shares or if any
               Optioned Shares shall be changed into the same or a
               different number of shares of the same or another class of
               stock or other securities, then, upon exercise of the Option
               the Purchaser shall receive for the aggregate price payable
               upon exercise of the Option with respect to the Optioned
               Shares, all such shares of stock, other securities, cash or
               other property issued, delivered or received with respect to
               such Optioned Shares (or if the Option shall not be
               exercised, appropriate adjustment shall be made for purposes
               of the calculations set forth in this Agreement).

                         7.  Covenants of the Stockholder.

                         (a)  The Stockholder agrees, until the Option has
               expired, not to:

                         (i) sell, transfer, pledge, assign or otherwise
                    dispose of, or enter into any contract, option or other
                    arrangement with respect to the sale, transfer, pledge,
                    assignment or other disposition of, the Optioned Shares
                    to any person other than the Purchaser or the
                    Purchaser's designee;

                         (ii) acquire any additional shares of Common Stock
                    without the prior consent of the Purchaser; or

                         (iii) deposit any Optioned Shares into a voting
                    trust or grant a proxy or enter into a voting agreement
                    with respect to any Optioned Shares except as provided
                    in this Agreement.

                         (b)  The parties hereto agree that, until the
               Option has expired, the Stockholder may (and, if requested
               to do so in writing by Parent, will) tender the Optioned
               Shares in the Offer.

                         (c)  The Stockholder agrees to execute and
               deliver, simultaneously with the execution and delivery of
               this Agreement, a proxy for the benefit of the Purchaser in
               the form of Exhibit A hereto.

                         8.  No Brokers.  Each of the Stockholder, Parent
               and the Purchaser represents, as to itself and its
               affiliates, that no agent, broker, investment banker or
               other firm or person is or will be entitled to any broker's
               or finder's fees or any other commission or similar fee in
<PAGE>



               <PAGE>8



               

               connection with any of the transactions contemplated by this
               Agreement and respectively agrees to indemnify and hold the
               others harmless from and against any and all claims,
               liabilities or obligations with respect to any such fees,
               commissions or expenses asserted by any person on the basis
               of any act or statement alleged to have occurred or been
               made by such party or its affiliates.

                         9.  Survival of Representations.  All
               representations, warranties and agreements made by the
               parties to this Agreement shall survive the closings
               hereunder notwithstanding any investigation at any time made
               by or on behalf of any party hereto.

                         10.  Further Assurances.  If the Purchaser shall
               exercise the Option in accordance with the terms of this
               Agreement, from time to time and without additional
               consideration the Stockholder will execute and deliver, or
               cause to be executed and delivered, such additional or
               further transfers, assignments, endorsements, consents and
               other instruments as the Purchaser may reasonably request
               for the purpose of effectively carrying out the transactions
               contemplated by this Agreement, including the transfer of
               the Optioned Shares to the Purchaser and the release of any
               and all liens, claims and encumbrances with respect thereto.

                         11.  Assignment.  Neither this Agreement nor any of
               the rights, interests or obligations hereunder shall be
               assigned by any of the parties without the prior written
               consent of the other parties, except that the Purchaser may
               assign, in its sole discretion, any or all of its rights,
               interests and obligations hereunder to Parent or to any
               direct or indirect wholly owned subsidiary of Parent. 
               Subject to the preceding sentence, this Agreement will be
               binding upon, inure to the benefit of and be enforceable by
               the parties and their respective successors and assigns.

                         12.  General Provisions.

                         (a)  Specific Performance.  The parties hereto
               acknowledge that damages would be an inadequate remedy for
               any breach of the provisions of this Agreement and agree
               that the obligations of the parties hereunder shall be
               specifically enforceable.

                         (b)  Expenses.  Whether or not the Option is
               exercised, all costs and expenses incurred in connection
               with the Option, this Agreement and the transactions <PAGE>
 


               <PAGE>9



               

               contemplated hereby shall be paid by the party incurring
               such expense.

                         (c)  Amendments.  This Agreement may not be
               amended except by an instrument in writing signed by each of
               the parties hereto.

                         (d)  Notices.  All notices and other
               communications hereunder shall be in writing and shall be
               deemed given if delivered personally or sent by overnight
               courier (providing proof of delivery) to the parties at the
               following addresses (or at such other address for a party as
               shall be specified by like notice):

                         (i)  if to Parent or the Purchaser, to 

                              National Health Laboratories Incorporated
                              4225 Executive Square
                              Suite 800
                              La Jolla, California 92037
                              Facsimile:  (619) 658-6693

                              Attention:  Mr. James R. Maher;

                              with a copy to:

                              Cravath, Swaine & Moore
                              Worldwide Plaza
                              825 Eighth Avenue
                              New York, New York 10019
                              Facsimile:  (212) 474-3700

                              Attention:  Allen Finkelson, Esq., and
<PAGE>



               <PAGE>10



               

                             (ii)  if to the Stockholder, to

                              Warburg, Pincus Capital Company, L.P.
                              466 Lexington Avenue
                              New York, New York 10017
                              Facsimile:  (212) 878-9361

                              Attention:  Mr. James E. Thomas

                              with a copy to:

                              Willkie Farr & Gallagher 
                              One Citicorp Center
                              153 East 53rd Street
                              New York, New York 10022
                              Facsimile:  (212) 821-8111

                              Attention:  Bruce R. Kraus, Esq.

                         (e)  Interpretation.  When a reference is made in
               this Agreement to Sections or Exhibits, such reference shall
               be to a Section or Exhibit to this Agreement unless
               otherwise indicated.  The headings contained in this
               Agreement are for reference purposes only and shall not
               affect in any way the meaning or interpretation of this
               Agreement.  Wherever the words "include", "includes" or
               "including" are used in this Agreement, they shall be deemed
               to be followed by the words "without limitation".

                         (f)  Counterparts.  This Agreement may be executed
               in one or more counterparts, all of which shall be
               considered one and the same agreement, and shall become
               effective when one or more of the counterparts have been
               signed by each of the parties and delivered to the other
               parties, it being understood that all parties need not sign
               the same counterpart.

                         (g)  Entire Agreement; No Third-Party
               Beneficiaries.  This Agreement (including the documents and
               instruments referred to herein) (i) constitutes the entire
               agreement and supersedes all prior agreements and
               understandings, both written and oral, among the parties
               with respect to the subject matter hereof and (ii) is not
               intended to confer upon any person other than the parties
               hereto any rights or remedies hereunder.
<PAGE>



               <PAGE>11



               

                         (h)  Governing Law.  This Agreement shall be
               governed by and construed in accordance with the laws of the
               State of Delaware.


                         IN WITNESS WHEREOF, Parent, the Purchaser and the
               Stockholder have caused this Agreement to be signed by their
               respective duly authorized representatives, all as of the
               date first written above.


                                             NATIONAL HEALTH LABORATORIES
                                             INCORPORATED,

                                               by
                                                    /s/James R. Maher     
                                                  Name:  James R. Maher
                                                  Title: President and
                                                         Chief Executive
                                                         Officer


                                             N ACQUISITION CORP.,

                                               by
                                                    /s/James R. Maher
                                                  Name:  James R. Maher
                                                  Title: President and
                                                         Chief Executive
                                                         Officer


                                             WARBURG, PINCUS CAPITAL
                                             COMPANY, L.P.,

                                               by E.M. WARBURG, PINCUS &
                                                  CO., General Partner





               <PAGE>12
                                                                  EXHIBIT A




                                       Proxy

                         The undersigned hereby irrevocably constitutes and

               appoints James R. Maher, David C. Flaugh and James G.

               Richmond, and each of them, and any other designees of

               N Acquisition Corp., a Delaware corporation (the

               "Purchaser"), the attorneys and proxies of the undersigned,

               each with full power of substitution, to vote each of the

               shares of Common Stock, par value $.01 per share, of Allied

               Clinical Laboratories, Inc., a Delaware corporation (the

               "Company"), owned by the undersigned (the "Shares") (and any

               and all other securities or rights issued or issuable in

               respect of such Shares on or after May 3, 1994) at any

               annual, special or adjourned meeting of the stockholders of

               the Company, (i) in favor of the adoption of the Merger

               Agreement dated as of May 3, 1994 (the "Merger Agreement"),

               among the Company, the Purchaser and National Health

               Laboratories Incorporated, a Delaware corporation

               ("Parent"), and approval of the Merger (as defined in the

               Merger Agreement) and the other transactions contemplated by

               the Merger Agreement, (ii) against any takeover proposal (as

               defined in the Merger Agreement) (other than the Merger) and

               against any other action or agreement that would result in a

               breach of any covenant, representation or warranty or any

               other obligation or agreement of the Company under the
<PAGE>



               <PAGE>13



               

               Merger Agreement or which could result in any of the

               conditions to the Company's obligations under the Merger

               Agreement not being fulfilled and (iii) in favor of any

               other matter relating to consummation of the transactions

               contemplated by the Merger Agreement.  This appointment is

               effective upon the execution of, and only until the

               expiration of the option granted pursuant to, the Stock

               Option Agreement dated as of May 3, 1994, among Parent, the

               Purchaser and the undersigned.  This power of attorney and

               proxy is irrevocable, is granted in consideration of the

               Purchaser entering into the Merger Agreement and is coupled

               with an interest sufficient in law to support an irrevocable

               power.  This appointment shall revoke all prior attorneys

               and proxies appointed by the undersigned at any time with

               respect to such Shares (and any such other securities or

               rights) and no subsequent attorneys or proxies will be

               appointed by the undersigned, or be effective, with

               respective thereto.


               Dated:  May 3, 1994           WARBURG, PINCUS CAPITAL 
                                             COMPANY, L.P.,

                                               by E.M. WARBURG, PINCUS &
                                                  CO., General Partner









                                                              EXHIBIT 99(B)
                                                             CONFORMED COPY




                                   STOCK OPTION AGREEMENT dated as of
                              May 3, 1994, among NATIONAL HEALTH
                              LABORATORIES INCORPORATED, a Delaware
                              corporation ("Parent"), N ACQUISITION CORP.,
                              a Delaware corporation (the "Purchaser"), and
                              HAYWOOD D. COCHRANE, JR. (the "Stockholder").


                         WHEREAS Parent, the Purchaser and Allied Clinical
               Laboratories, Inc., a Delaware corporation (the "Company"),
               propose to enter into an Agreement and Plan of Merger of
               even date herewith (the "Merger Agreement") providing for
               the making of a cash tender offer (the "Offer") by the
               Purchaser for shares of Common Stock, par value $.01 per
               share, of the Company (the "Common Stock") and the merger of
               the Company and the Purchaser (the "Merger"); 

                         WHEREAS the Stockholder owns in the aggregate
               264,773 shares of Common Stock (the "Optioned Shares"); and 

                         WHEREAS, as a condition to their willingness to
               enter into the Merger Agreement, Parent and the Purchaser
               have required that the Stockholder agree to grant the
               Purchaser an irrevocable option, as set forth herein, to
               purchase all the Optioned Shares; 

                         NOW, THEREFORE, to induce Parent and the Purchaser
               to enter into, and in consideration of their entering into,
               the Merger Agreement, and in consideration of the premises
               and the representations, warranties and agreements herein
               contained, the parties agree as follows:

                         1.  Grant of Option.  The Stockholder hereby
               grants the Purchaser an irrevocable option (the "Option") to
               purchase for $23 per share in cash (the "Per Share Price")
               all the Optioned Shares.  The Option shall not become
               exercisable and shall expire on May 10, 1994, if the Offer
               is not commenced by May 10, 1994 for any reason other than
               that referred to in clause (i) below.  The Option shall
               expire (if not theretofore exercised) (i) if the Offer is
               not commenced by May 10, 1994, as a result of the failure of
               any of the conditions set forth in paragraphs (a) through
               (h) of Exhibit A to the Merger Agreement, on June 9, 1994,
               or (ii) if the Offer is so commenced, 30 trading
               days following termination of the Offer, whether or not
               shares of Common Stock shall have been accepted for payment
               by the Purchaser (or Parent or any other person who is
               authorized by Parent) pursuant to the Offer; provided that,
<PAGE>



               <PAGE>2



               

               if the Option cannot be exercised on any such date because
               the waiting period under the Hart-Scott-Rodino Antitrust
               Improvements Act of 1976 (the "HSR Act") with respect to the
               exercise of the Option shall not have expired or been
               terminated or because of any injunction, order or similar
               restraint by a court of competent jurisdiction, the Option
               shall expire on the fifth trading day after such waiting
               period shall have expired or been terminated or such
               injunction, order or restraint shall have been dissolved or
               when such injunction, order or restraint shall have become
               permanent and no longer subject to appeal, as the case may
               be.  A "trading day" shall be any date on which the New York
               Stock Exchange shall be open for business.

                         2.  Exercise of Option.  

                         (a)  Provided that (i) the waiting period under
               the HSR Act with respect to the exercise of the Option shall
               have expired or been terminated and (ii)(A) as a result of
               the failure of any of the conditions set forth in
               paragraphs (a) through (h) of Exhibit A to the Merger
               Agreement, the Purchaser shall have failed to commence the
               Offer by May 10, 1994, or (B) the Offer, having been so
               commenced, has been terminated, whether or not shares of
               Common Stock shall have been accepted for payment by the
               Purchaser (or Parent or any other Person who is authorized
               by Parent) pursuant to the Offer, then the Purchaser may
               exercise the Option at any time in whole prior to the
               expiration of the Option.  In the event that the Purchaser
               wishes to exercise the Option, the Purchaser shall do so by
               giving written notice (the date of such notice being herein
               called the "Notice Date") to the Stockholder specifying the
               place, time and date not earlier than two trading days, nor
               later than 10 trading days, from the Notice Date for the
               closing of the purchase by the Purchaser pursuant to such
               exercise.

                         (b)  In the event that any share of Common Stock
               is accepted for payment and paid for by the Purchaser (or
               Parent or any other person who is authorized by Parent)
               pursuant to the Offer, the Purchaser shall be obligated to
               exercise the Option in whole (with respect to the Optioned
               Shares not theretofore accepted for payment and paid for
               pursuant to the Offer) no later than five trading days
               following the date of such payment; provided, however, that
               if the waiting period under the HSR Act with respect to the
               exercise of the Option shall not have expired or been
               terminated or any injunction, order or similar restraint by
<PAGE>



               <PAGE>3



               

               a court of competent jurisdiction shall exist, in each case
               on such fifth trading day, then, notwithstanding the
               foregoing, the Purchaser shall be obligated to exercise the
               Option in whole not later than five trading days after such
               waiting period shall have expired or been terminated or such
               injunction, order or restraint shall have been dissolved.

                         3.  Payment of Purchase Price and Delivery of
               Certificates for Optioned Shares.  At any closing of the
               exercise of the Option hereunder, (i) the Purchaser will
               deliver to the Stockholder a certified or official bank
               check payable to the order of the Stockholder in New York
               Clearing House funds in an amount equal to the product of
               the Per Share Price and the number of Optioned Shares being
               purchased at such closing and (ii) the Stockholder shall
               deliver to the Purchaser certificates representing the
               Optioned Shares sold by the Stockholder to the Purchaser at
               such closing, duly endorsed in blank or accompanied by stock
               powers duly executed by the Stockholder in blank, in proper
               form for transfer.

                         4.  Representations and Warranties of the
               Stockholder.  The Stockholder hereby represents and warrants
               to Parent and the Purchaser as follows:

                         (a)  Authority; Noncontravention.  The Stockholder
                    has all requisite power and authority to enter into
                    this Agreement and to consummate the transactions
                    contemplated hereby.  The execution and delivery of
                    this Agreement by the Stockholder and the consummation
                    by the Stockholder of the transactions contemplated
                    hereby have, in the case of each Stockholder that is
                    not a natural person, been duly authorized by all
                    necessary partnership action on the part of the
                    Stockholder.  This Agreement has been duly executed and
                    delivered by the Stockholder and constitutes a valid
                    and binding obligation of the Stockholder, enforceable
                    against the Stockholder in accordance with its terms. 
                    The execution and delivery of this Agreement do not,
                    and the consummation of the transactions contemplated
                    hereby and compliance with the terms hereof will not,
                    conflict with, or result in any violation of, or
                    default (with or without notice or lapse of time or
                    both) under (i) with respect to Stockholders that are
                    not natural persons, the certificate of incorporation
                    or by-laws or any other comparable charter or
                    organizational documents of the Stockholder or (ii) any
                    provision of any trust agreement, loan or credit
<PAGE>



               <PAGE>4



               

                    agreement, note, bond, mortgage, indenture, lease or
                    other agreement, instrument, permit, concession,
                    franchise, license, judgment, order, decree, statute,
                    law, ordinance, rule or regulation applicable to the
                    Stockholder or to the Stockholder's property or assets,
                    other than, in the case of clause (ii), any such
                    conflicts, violations, defaults, rights or liens that
                    individually or in the aggregate would not (x) impair
                    the ability of the Stockholder to perform its
                    obligations under this Agreement or (y) prevent the
                    consummation of any of the transactions contemplated by
                    this Agreement.  No consent, approval, order or
                    authorization of, or registration, declaration or
                    filing with, any Federal, state or local government or
                    any court, administrative or regulatory agency or
                    commission or other governmental authority or agency,
                    domestic or foreign (a "Governmental Entity"), is
                    required by or with respect to the Stockholder in
                    connection with the execution and delivery of this
                    Agreement or the consummation by the Stockholder of the
                    transactions contemplated by this Agreement, except for
                    (1) the filing with the Securities and Exchange
                    Commission of such reports under Sections 13(d) and
                    16(a) of the Securities Exchange Act of 1934, as
                    amended, as may be required in connection with this
                    Agreement and the transactions contemplated by this
                    Agreement and (2) such other consents, approvals,
                    orders, authorizations, registrations, declarations and
                    filings as would not individually or in the aggregate
                    prevent the consummation of any of the transactions
                    contemplated by this Agreement. 

                         (b)  The Optioned Shares.  The Stockholder has,
                    and the transfer by the Stockholder of the Optioned
                    Shares hereunder will pass to the Purchaser, good and
                    marketable title to the Optioned Shares, free and clear
                    of any claims, liens, encumbrances, security interests,
                    voting restrictions and limitations on disposition
                    whatsoever.  The Stockholder does not directly or
                    indirectly own, either beneficially or of record, any
                    shares of Common Stock other than the Optioned Shares.

                         5.  Representations and Warranties of Parent and
               the Purchaser.  Parent and the Purchaser hereby represent
               and warrant to the Stockholder as follows:

                         (a)  Authority; Noncontravention.  Parent and the
                    Purchaser have all requisite corporate power and
<PAGE>



               <PAGE>5



               

                    authority to enter into this Agreement and to
                    consummate the transactions contemplated by this
                    Agreement.  The execution and delivery of this
                    Agreement and the consummation of the transactions
                    contemplated by this Agreement have been duly
                    authorized by all necessary corporate action on the
                    part of Parent and the Purchaser.  This Agreement has
                    been duly executed and delivered by Parent and the
                    Purchaser and constitutes a valid and binding
                    obligation of each such party, enforceable against each
                    such party in accordance with its terms.  The execution
                    and delivery of this Agreement do not, and the
                    consummation of the transactions contemplated by this
                    Agreement and compliance with the provisions of this
                    Agreement will not, conflict with, or result in any
                    violation of, or default (with or without notice or
                    lapse of time, or both) under, or give rise to a right
                    of termination, cancellation or acceleration of any
                    obligation or to loss of a material benefit under, or
                    result in the creation of any lien upon any of the
                    properties or assets of Parent or any of its
                    subsidiaries under, (i) the certificate of
                    incorporation or by-laws of Parent or the Purchaser or
                    the comparable charter or organizational documents of
                    any other subsidiary of Parent, (ii) any loan or credit
                    agreement, note, bond, mortgage, indenture, lease or
                    other agreement, instrument, permit, concession,
                    franchise or license applicable to Parent or any of its
                    subsidiaries or their respective properties or assets
                    or (iii) subject to the governmental filings and other
                    matters referred to in the following sentence, any
                    judgment, order, decree, statute, law, ordinance, rule
                    or regulation applicable to Parent or any of its
                    subsidiaries or their respective properties or assets,
                    other than, in the case of clause (ii) or (iii), any
                    such conflicts, violations, defaults, rights or liens
                    that individually or in the aggregate would not
                    (x) have a material adverse effect (as such term is
                    defined in the Merger Agreement) on Parent, (y) impair
                    the ability of Parent and the Purchaser to perform
                    their respective obligations under this Agreement or
                    (z) prevent the consummation of any of the transactions
                    contemplated by this Agreement.  No consent, approval,
                    order or authorization of, or registration, declaration
                    or filing with, any Governmental Entity is required by
                    or with respect to Parent or any of its subsidiaries in
                    connection with the execution and delivery of this
                    Agreement or the consummation by Parent or the
<PAGE>



               <PAGE>6



               

                    Purchaser of any of the transactions contemplated by
                    this Agreement, except for (1) filings under the HSR
                    Act, if applicable, (2) the filing with the Securities
                    and Exchange Commission of such reports under
                    Sections 13(a), 13(d) and 16(a) of the Securities
                    Exchange Act of 1934, as amended, as may be required in
                    connection with this Agreement and the transactions
                    contemplated by this Agreement and (3) such other
                    consents, approvals, orders, authorizations,
                    registrations, declarations and filings as would not
                    individually or in the aggregate (A) have a material
                    adverse effect on Parent or (B) prevent the
                    consummation of any of the transactions contemplated by
                    this Agreement.

                         (b)  Securities Act.  Any Optioned Shares
                    purchased by the Purchaser pursuant to this Agreement
                    will be acquired for investment only and not with a
                    view to any public distribution thereof, and the
                    Purchaser will not offer to sell or otherwise dispose
                    of any Optioned Shares so acquired by it in violation
                    of any of the registration requirements of the
                    Securities Act of 1933, as amended.

                         6.  Distributions; Adjustment upon Changes in
               Capitalization.  (a)  Any dividends or other distributions
               (whether payable in cash, stock or otherwise) by the Company
               with respect to any Optioned Shares purchased hereunder with
               a record date on or after the date of the closing of such
               purchase will belong to the Purchaser.  If any such dividend
               or distribution belonging to the Purchaser is paid by the
               Company to the Stockholder, the Stockholder shall hold such
               dividend or distribution in trust for the benefit of the
               Purchaser and shall promptly remit such dividend or
               distribution to the Purchaser in exactly the form received,
               accompanied by appropriate instruments of transfer.

                         (b)  If on or after the date of this Agreement
               there shall occur any stock dividend, stock split,
               recapitalization, combination or exchange of shares, merger,
               consolidation, reorganization or other change or transaction
               of or by the Company, as a result of which shares of any
               class of stock, other securities, cash or other property
               shall be issued in respect of any Optioned Shares or if any
               Optioned Shares shall be changed into the same or a
               different number of shares of the same or another class of
               stock or other securities, then, upon exercise of the Option
               the Purchaser shall receive for the aggregate price payable
<PAGE>



               <PAGE>7



               

               upon exercise of the Option with respect to the Optioned
               Shares, all such shares of stock, other securities, cash or
               other property issued, delivered or received with respect to
               such Optioned Shares (or if the Option shall not be
               exercised, appropriate adjustment shall be made for purposes
               of the calculations set forth in this Agreement).

                         7.  Covenants of the Stockholder.

                         (a)  The Stockholder agrees, until the Option has
               expired, not to:

                         (i) sell, transfer, pledge, assign or otherwise
                    dispose of, or enter into any contract, option or other
                    arrangement with respect to the sale, transfer, pledge,
                    assignment or other disposition of, the Optioned Shares
                    to any person other than the Purchaser or the
                    Purchaser's designee;

                        (ii) acquire any additional shares of Common Stock
                    without the prior consent of the Purchaser; or

                        (iii) deposit any Optioned Shares into a voting
                    trust or grant a proxy or enter into a voting agreement
                    with respect to any Optioned Shares except as provided
                    in this Agreement.

                         (b)  The parties hereto agree that, until the
               Option has expired, the Stockholder may (and, if requested
               to do so in writing by Parent, will) tender the Optioned
               Shares in the Offer.

                         (c)  The Stockholder agrees to execute and
               deliver, simultaneously with the execution and delivery of
               this Agreement, a proxy for the benefit of the Purchaser in
               the form of Exhibit A hereto.

                         8.  No Brokers.  Each of the Stockholder, Parent
               and the Purchaser represents, as to itself and its
               affiliates, that no agent, broker, investment banker or
               other firm or person is or will be entitled to any broker's
               or finder's fees or any other commission or similar fee in
               connection with any of the transactions contemplated by this
               Agreement and respectively agrees to indemnify and hold the
               others harmless from and against any and all claims,
               liabilities or obligations with respect to any such fees,
               commissions or expenses asserted by any person on the basis
<PAGE>



               <PAGE>8



               

               of any act or statement alleged to have occurred or been
               made by such party or its affiliates.

                         9.  Survival of Representations.  All
               representations, warranties and agreements made by the
               parties to this Agreement shall survive the closings
               hereunder notwithstanding any investigation at any time made
               by or on behalf of any party hereto.

                         10.  Further Assurances.  If the Purchaser shall
               exercise the Option in accordance with the terms of this
               Agreement, from time to time and without additional
               consideration the Stockholder will execute and deliver, or
               cause to be executed and delivered, such additional or
               further transfers, assignments, endorsements, consents and
               other instruments as the Purchaser may reasonably request
               for the purpose of effectively carrying out the transactions
               contemplated by this Agreement, including the transfer of
               the Optioned Shares to the Purchaser and the release of any
               and all liens, claims and encumbrances with respect thereto.

                         11.  Assignment.  Neither this Agreement nor any of
               the rights, interests or obligations hereunder shall be
               assigned by any of the parties without the prior written
               consent of the other parties, except that the Purchaser may
               assign, in its sole discretion, any or all of its rights,
               interests and obligations hereunder to Parent or to any
               direct or indirect wholly owned subsidiary of Parent. 
               Subject to the preceding sentence, this Agreement will be
               binding upon, inure to the benefit of and be enforceable by
               the parties and their respective successors and assigns.

                         12.  General Provisions.

                         (a)  Specific Performance.  The parties hereto
               acknowledge that damages would be an inadequate remedy for
               any breach of the provisions of this Agreement and agree
               that the obligations of the parties hereunder shall be
               specifically enforceable.

                         (b)  Expenses.  Whether or not the Option is
               exercised, all costs and expenses incurred in connection
               with the Option, this Agreement and the transactions
               contemplated hereby shall be paid by the party incurring
               such expense. <PAGE>
 


               <PAGE>9



               

                         (c)  Amendments.  This Agreement may not be
               amended except by an instrument in writing signed by each of
               the parties hereto.

                         (d)  Notices.  All notices and other
               communications hereunder shall be in writing and shall be
               deemed given if delivered personally or sent by overnight
               courier (providing proof of delivery) to the parties at the
               following addresses (or at such other address for a party as
               shall be specified by like notice):

                         (i)  if to Parent or the Purchaser, to 

                              National Health Laboratories Incorporated
                              4225 Executive Square
                              Suite 800
                              La Jolla, California 92037
                              Facsimile:  (619) 658-6693

                              Attention:  Mr. James R. Maher;

                              with a copy to:

                              Cravath, Swaine & Moore
                              Worldwide Plaza
                              825 Eighth Avenue
                              New York, New York 10019
                              Facsimile:  (212) 474-3700

                              Attention:  Allen Finkelson, Esq., and
<PAGE>



               <PAGE>10



               

                              (ii)  if to the Stockholder, to

                              Mr. Haywood D. Cochrane, Jr.
                              Allied Clinical Laboratories, Inc.
                              2515 Park Plaza
                              Nashville, Tennessee 37203
                              Facsimile:  (615) 320-2013

                              with a copy to:

                              Irell & Manella 
                              1800 Avenue of the Stars
                              Suite 900
                              Los Angeles, California 90067
                              Facsimile:  (310) 203-7199

                              Attention:  Ronald Loeb, Esq.

                              and a copy to:

                              Irell & Manella 
                              333 South Hope Street
                              Suite 3300
                              Los Angeles, California 90071
                              Facsimile:  (213) 229-0515

                              Attention:  Stephen Rothman, Esq.


                         (e)  Interpretation.  When a reference is made in
               this Agreement to Sections or Exhibits, such reference shall
               be to a Section or Exhibit to this Agreement unless
               otherwise indicated.  The headings contained in this
               Agreement are for reference purposes only and shall not
               affect in any way the meaning or interpretation of this
               Agreement.  Wherever the words "include", "includes" or
               "including" are used in this Agreement, they shall be deemed
               to be followed by the words "without limitation".

                         (f)  Counterparts.  This Agreement may be executed
               in one or more counterparts, all of which shall be
               considered one and the same agreement, and shall become
               effective when one or more of the counterparts have been
               signed by each of the parties and delivered to the other
               parties, it being understood that all parties need not sign
               the same counterpart.
<PAGE>



               <PAGE>11



               

                         (g)  Entire Agreement; No Third-Party
               Beneficiaries.  This Agreement (including the documents and
               instruments referred to herein) (i) constitutes the entire
               agreement and supersedes all prior agreements and
               understandings, both written and oral, among the parties
               with respect to the subject matter hereof and (ii) is not
               intended to confer upon any person other than the parties
               hereto any rights or remedies hereunder.

                         (h)  Governing Law.  This Agreement shall be
               governed by and construed in accordance with the laws of the
               State of Delaware.


                         IN WITNESS WHEREOF, Parent, the Purchaser and the
               Stockholder have caused this Agreement to be signed by their
               respective duly authorized representatives, all as of the
               date first written above.


                                             NATIONAL HEALTH LABORATORIES
                                             INCORPORATED,

                                               by
                                                    /s/James R. Maher
                                                  Name:  James R. Maher
                                                  Title: President and
                                                         Chief Executive
                                                         Officer


                                             N ACQUISITION CORP.,

                                               by
                                                   /s/James R. Maher
                                                  Name:  James R. Maher
                                                  Title: President and
                                                         Chief Executive
                                                         Officer


                                             /s/Haywood D. Cochrane, Jr.
                                             Haywood D. Cochrane, Jr.
<PAGE>



               <PAGE>12



               

                                       Proxy                     EXHIBIT A

                         The undersigned hereby irrevocably constitutes and

               appoints James R. Maher, David C. Flaugh and James G.

               Richmond, and each of them, and any other designees of

               N Acquisition Corp., a Delaware corporation (the

               "Purchaser"), the attorneys and proxies of the undersigned,

               each with full power of substitution, to vote each of the

               shares of Common Stock, par value $.01 per share, of Allied

               Clinical Laboratories, Inc., a Delaware corporation (the

               "Company"), owned by the undersigned (the "Shares") (and any

               and all other securities or rights issued or issuable in

               respect of such Shares on or after May 3, 1994) at any

               annual, special or adjourned meeting of the stockholders of

               the Company, (i) in favor of the adoption of the Merger

               Agreement dated as of May 3, 1994 (the "Merger Agreement"),

               among the Company, the Purchaser and National Health

               Laboratories Incorporated, a Delaware corporation

               ("Parent"), and approval of the Merger (as defined in the

               Merger Agreement) and the other transactions contemplated by

               the Merger Agreement, (ii) against any takeover proposal (as

               defined in the Merger Agreement) (other than the Merger) and

               against any other action or agreement that would result in a

               breach of any covenant, representation or warranty or any

               other obligation or agreement of the Company under the
<PAGE>



               <PAGE>13



               

               Merger Agreement or which could result in any of the

               conditions to the Company's obligations under the Merger

               Agreement not being fulfilled and (iii) in favor of any

               other matter relating to consummation of the transactions

               contemplated by the Merger Agreement.  This appointment is

               effective upon the execution of, and only until the

               expiration of the option granted pursuant to, the Stock

               Option Agreement dated as of May 3, 1994, among Parent, the

               Purchaser and the undersigned.  This power of attorney and

               proxy is irrevocable, is granted in consideration of the

               Purchaser entering into the Merger Agreement and is coupled

               with an interest sufficient in law to support an irrevocable

               power.  This appointment shall revoke all prior attorneys

               and proxies appointed by the undersigned at any time with

               respect to such Shares (and any such other securities or

               rights) and no subsequent attorneys or proxies will be

               appointed by the undersigned, or be effective, with

               respective thereto.


               Dated:  May 3, 1994

                                         
                                             Haywood D. Cochrane, Jr.
<PAGE>


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