NORTH AMERICAN VACCINE INC
10-Q, 1996-05-15
BIOLOGICAL PRODUCTS, (NO DIAGNOSTIC SUBSTANCES)
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<PAGE>

                                    UNITED STATES
                          SECURITIES AND EXCHANGE COMMISSION
                                Washington, DC  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, 1996

                                          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   1-10451

                             NORTH AMERICAN VACCINE, INC.
                           --------------------------------
                 Exact name of registrant as specified in its charter

               Canada                                 None     
          State or other jurisdiction of          IRS Employer 
          incorporation or organization           Identification No.

     12103 Indian Creek Court, Beltsville, Maryland     20705
     ----------------------------------------------     -----
     (Address of principal executive offices)           Zip Code
       
     Registrant's telephone number, including area code:  (301) 470-6100
     _________________________________________________
     (Former name, former address and former fiscal  year, if changed since last
     report)

     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      
         -----    -----

     Indicate  the number  of  shares outstanding  of  each of  the registrant's
     classes of common stock, as of the latest practicable date.

     Common  Stock, no par  value, outstanding as of  May 8,  1996 -- 30,547,061
     shares
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                                  TABLE OF CONTENTS

                                                                               
                                                        

                                                                     PAGE NUMBER
                                                                     -----------
     PART I.  FINANCIAL INFORMATION                                            
                                                    
     Item 1.   Financial Statements  . . . . . . . . . . . . . . . . . . .     3

               Consolidated Balance Sheets   . . . . . . . . . . . . . . .     4

               Consolidated Statements of Operations   . . . . . . . . . .     5

               Consolidated Statement of Shareholders' Equity  . . . . . .     6

               Consolidated Statements of Cash Flows   . . . . . . . . . .     7

               Notes to Condensed Consolidated Financial Statements  . . .     9
             
     Item 2.   Management's Discussion and Analysis of
               Financial Condition and Results of Operations   . . . . . .    11


     PART II.  OTHER INFORMATION

     Item 6.   Exhibits and Reports on Form 8-K  . . . . . . . . . . . . .    16

     SIGNATURES  . . . . . . . . . . . . . . . . . . . . . . . . . . . . .    17
<PAGE>






                            PART I.  FINANCIAL INFORMATION


     ITEM 1.   FINANCIAL STATEMENTS

     The  following unaudited,  condensed consolidated  financial  statements of
     North American  Vaccine, Inc.  and Subsidiaries (the  "Company") have  been
     prepared in accordance with the  instructions to Form 10-Q  and, therefore,
     omit or condense certain footnotes and other information  normally included
     in  financial statements  prepared in  accordance  with generally  accepted
     accounting principles.  This report should be read in conjunction  with the
     Company's Annual Report on  Form 10-K filed for the year ended December 31,
     1995.   In the opinion of  management, all adjustments  (consisting only of
     normal  recurring adjustments)  necessary  for a  fair presentation  of the
     financial information  for  the interim  period  reported have  been  made.
     Results of operations  for the three months ended  March 31, 1996, will not
     necessarily be indicative of the results for the entire fiscal year  ending
     December 31, 1996.



































                                          3
<PAGE>






     <TABLE>
     <CAPTION>

     NORTH AMERICAN VACCINE, INC. AND SUBSIDIARIES
     CONSOLIDATED BALANCE SHEETS
     (In thousands, except share and per share data)

                                                                                   March 31,        December 31,
                                                                                      1996              1995
                                                                                ---------------    --------------
                                                                                  (Unaudited)
       <S>                                                                        <C>               <C>          
       ASSETS
       ------
       Current assets:
            Cash and cash equivalents                                                    $10,012          $10,443
            Accounts receivable                                                            1,199            2,000
            Prepaid expenses and other current assets                                      1,652            1,067
                                                                                        --------         --------
                 Total current assets                                                     12,863           13,510


       Property, plant and equipment, net                                                 18,065           18,121
       Investment in affiliate, at market                                                  3,234            9,065
       Other assets                                                                          513              553
                                                                                        --------         --------
            Total assets                                                                 $34,675          $41,249
                                                                                        ========         ========
       LIABILITIES AND SHAREHOLDERS' EQUITY
       ------------------------------------
       Current liabilities:
            Accounts payable                                                              $3,194           $3,550
            Other current liabilities                                                      4,788            4,296
                                                                                        --------         --------
                 Total current liabilities                                                 7,982            7,846
                                                                                        --------         --------
       Deferred rent credit, net of current portion                                          183              205
       Shareholders' equity:
            Preferred stock, no par value; unlimited shares authorized-
                 Series A, convertible; issued and outstanding 2,000,000
                 shares; entitled to Can $2.50 per share in liquidation                    6,538            6,538

            Common stock, no par value; unlimited shares authorized; issued
                 30,492,720 shares at March 31, 1996 and 30,186,711 shares
                 at December 31, 1995                                                     59,161           58,474
            Unrealized investment holding gain                                             2,606            7,466
            Accumulated deficit                                                         (41,795)         (39,280)
                                                                                        --------         --------
                 Total shareholders' equity                                               26,510           33,198
                                                                                        --------         --------
            Total liabilities and shareholders' equity                                   $34,675          $41,249
                                                                                        ========         ========

     </TABLE>


                                                                      4
<PAGE>






     The   accompanying  notes  are   an  integral   part  of   these  condensed
     consolidated financial statements.



















































                                          5
<PAGE>






     <TABLE>
     <CAPTION>
     NORTH AMERICAN VACCINE, INC. AND SUBSIDIARIES
     CONSOLIDATED STATEMENTS OF OPERATIONS
     (In thousands, except per share data)
     (Unaudited)

                                                                                       Three months ended
                                                                                            March 31,
                                                                                       1996           1995
                                                                                     --------       --------
       <S>                                                                             <C>            <C>     
       Sales                                                                           $    228       $    -  
                                                                                       --------       --------
       Operating expenses:
            Production                                                                    2,932          1,039
            Research and development                                                      2,677          1,606
            General and administrative                                                    1,481          1,199
                                                                                       --------       --------
                 Total operating expenses                                                 7,090          3,844
                                                                                       --------       --------

       Operating loss                                                                   (6,862)        (3,844)
       Other income:
            Gain on sale of investment in affiliate                                       4,228            -  
            Interest and dividend income                                                    119            234
                                                                                       --------       --------
       Net loss                                                                        ($2,515)       ($3,610)
                                                                                       ========       ========
       Net loss per share                                                               ($0.08)        ($0.12)
       Weighted-average number of common
            shares outstanding                                                           30,439         29,409
     </TABLE>

     The  accompanying  notes   are  an   integral  part   of  these   condensed
     consolidated financial statements.

















                                          6
<PAGE>






     <TABLE>
     <CAPTION>

     NORTH AMERICAN VACCINE, INC. AND SUBSIDIARIES
     CONSOLIDATED STATEMENT OF SHAREHOLDERS' EQUITY
     (In thousands)
     (Unaudited)


                                                     Series A
                                                    Convertible                              Unrealized
                                                  Preferred Stock         Common Stock        Invest-                   Total
                                                  ---------------         ------------          ment        Accum-      Share-
                                                                                              Holding       ulated     holders'
                                                Shares      Amount     Shares     Amount       Gains       Deficit      Equity
                                                ------      ------     ------     ------     ---------     --------    --------
       <S>                                       <C>        <C>        <C>         <C>          <C>       <C>           <C>    
       Balance, December 31, 1995                  2,000     $6,538     30,187     $58,474       $7,466   ($39,280)    $33,198 
       Exercise of stock options                       -          -        303         649            -           -        649 
       Shares issued under
         401(k) plan                                   -          -          3          38            -           -         38 
       Realized investment holding gain                -          -          -           -      (4,228)           -     (4,228)
       Decrease in market value
         of investment                                 -          -          -           -        (632)           -       (632)

       Net loss                                        -          -          -           -            -     (2,515)     (2,515)
                                                --------   --------   --------    --------     --------    --------    --------
       Balance, March 31, 1996                     2,000     $6,538     30,493     $59,161       $2,606   ($41,795)    $26,510 
                                                ========   ========   ========    ========     ========   =========    ========
     </TABLE>

     The  accompanying   notes  are   an  integral   part  of  these   condensed
     consolidated financial statements.




















                                          7
<PAGE>






     <TABLE>
     <CAPTION>

     NORTH AMERICAN VACCINE, INC. AND SUBSIDIARIES
     CONSOLIDATED STATEMENTS OF CASH FLOWS
     (In thousands)
     (Unaudited)

                                                                                                    Three Months Ended
                                                                                                         March 31,
                                                                                                    1996           1995
                                                                                                   ------         ------
       <S>                                                                                         <C>            <C>      
       Cash flows from operating activities:
            Net loss                                                                                ($2,515)       ($3,610)
            Adjustments to reconcile net loss to net cash used in operating
            activities:
                 Gain on sale of investment in affiliate                                             (4,228)            -  
                 Depreciation and amortization                                                         1,168            336
                 Contribution of common stock to 401(k) plan                                              38             30

                 Decrease (increase) in other assets                                                      40            (8)
                 Decrease in deferred rent                                                              (19)           (18)
                 Cash flows provided by other working capital items                                      349            482
                                                                                                    --------       --------
                      Net cash used in operating activities                                          (5,167)        (2,788)
                                                                                                    --------       --------
       Cash flows from investing activities:
            Capital expenditures                                                                     (1,112)        (6,007)
            Proceeds from sale of investment in affiliate                                              5,199            -  
                                                                                                    --------       --------
                      Net cash provided by (used in) investing activities                              4,087        (6,007)
                                                                                                    --------       --------

       Cash flows from financing activities:
            Proceeds from exercise of stock options                                                      649            434
                                                                                                    --------       --------
                      Net cash provided by financing activities                                          649            434
                                                                                                    --------       --------

       Net decrease in cash and cash equivalents                                                       (431)        (8,361)
       Cash and cash equivalents, beginning of period                                                 10,443         20,922
                                                                                                    --------       --------
       Cash and cash equivalents, end of period                                                      $10,012        $12,561
                                                                                                    ========       ========
     </TABLE>

     The  accompanying   notes  are   an  integral   part  of   these  condensed
     consolidated financial statements.




                                          8
<PAGE>






     <TABLE>
     <CAPTION>

     NORTH AMERICAN VACCINE, INC. AND SUBSIDIARIES
     CONSOLIDATED STATEMENTS OF CASH FLOWS (Continued)
     (In thousands)
     (Unaudited)

                                                                                                    Three Months Ended
                                                                                                         March 31,
                                                                                                    1996           1995
                                                                                                   ------         ------
       <S>                                                                                         <C>            <C>      
       Cash Flows Provided By (Used in) Other Working Capital Items:
            Decrease (increase) in:
                 Accounts receivable                                                                 $   801        $   -  
                 Amounts receivable from affiliate                                                       -               15

                 Prepaid expenses and other current assets                                             (585)          (459)

            Increase (decrease) in:
                 Accounts payable                                                                      (356)          (217)
                 Other current liabilities                                                               489          1,143
                                                                                                     -------        -------
            Net cash provided by other working capital items                                         $   349        $   482
                                                                                                     =======        =======
     </TABLE>

     The   accompanying  notes   are  an   integral  part   of  these  condensed
     consolidated financial statements.























                                          9
<PAGE>






                    NORTH AMERICAN VACCINE, INC. AND SUBSIDIARIES
                 NOTES TO CONDENSED CONSOLIDATED FINANCIAL STATEMENTS
                                     (Unaudited)


     1.   BUSINESS

     The  Company is  engaged  in the  research,  development and  production of
     vaccines for the  prevention of infectious diseases in children and adults.
     In the first quarter of  1996, the Swedish Medical Products Agency  granted
     regulatory  approval   of  the   Company's   acellular  pertussis   vaccine
     formulated  as a DTaP vaccine for the prevention of diphtheria, tetanus and
     pertussis (whooping cough).   The Company  has not  received approval  from
     the  U.S. Food  and  Drug Administration  ("FDA")  or any  other regulatory
     authority to market its DTaP vaccine or any other product in development.

     2.   SIGNIFICANT ACCOUNTING POLICIES

     (a)   Basis  of  Accounting  and  Currency. The  accompanying  consolidated
     financial  statements  have  been prepared  in  accordance  with  generally
     accepted  accounting  principles ("GAAP")  in  the  United States  and  are
     denominated in U.S. dollars, because  the Company conducts the  majority of
     its  transactions in this currency.  The application of Canadian GAAP would
     not  result   in  material  adjustments   to  the  accompanying   financial
     statements except for the impact  of the adoption of Statement of Financial
     Accounting Standards ("SFAS") No. 115, as discussed in  Note 3.  The effect
     of foreign currency translation has been immaterial.

     (b) Pervasiveness  of Estimates.  The  preparation of  financial statements
     in  conformity  with  GAAP  requires  management   to  make  estimates  and
     assumptions that affect  the reported amounts of assets and liabilities and
     disclosure of  contingent  assets  and  liabilities  at  the  date  of  the
     financial  statements and  the reported  amounts  of revenues  and expenses
     during the reporting period. Actual results could differ from estimates.  

     3.   INVESTMENTS IN AFFILIATES

     In accordance with  SFAS No. 115,  "Accounting for  Certain Investments  in
     Debt and  Equity Securities,"   equity securities classified as  available-
     for-sale  are reported  at  fair value,  with  unrealized gains  and losses
     reported in a separate component of shareholders' equity.

     At December 31, 1995, the Company owned 318,084  shares of IVAX Corporation
     ("IVAX") common stock.   The market value of these securities, as  shown on
     the accompanying  consolidated balance sheets,  have been determined  based
     on the closing prices for registered securities of IVAX as of those  dates.
     In  the first  quarter of  1996, the  Company  sold 193,084  shares of  its
     investment in  IVAX common stock  generating approximately $5.2 million  in
     proceeds (of  which $969,000  was received  in April  1996) and a  realized
     gain of  $4.2 million.   The market  value of  the Company's investment  in
     IVAX  at  May 9,  1996 was  approximately  $3.5 million.  These  investment


                                          10
<PAGE>






     securities are volatile  and therefore subject to  significant fluctuations
     in value.

     4.   OTHER CURRENT LIABILITIES

     Other current liabilities consisted of the following components:

     <TABLE>
     <CAPTION>

                                                         March 31,           December 31,
                                                            1996                 1995
                                                         ----------          ------------
       <S>                                          <C>                   <C>
       Payroll and fringe benefits                       $   953              $   736
       Accrued consulting and professional fees              951                  767
       Reserve for contract loss                             720                  720
       Accrued taxes                                         633                  633
       Accrued costs of clinical trials                      495                  574
       Accrued insurance                                     301                   33

       Other accrued liabilities                             298                  438
       Accrued construction costs                            349                  310
       Deferred rent credit                                   88                   85
                                                        --------             --------
            Total other current liabilities              $ 4,788              $ 4,296
                                                        ========              =======
     </TABLE>

     5.  SUBSEQUENT EVENT

     In May  1996,  the  Company completed  an  offering  of  6.50%  convertible
     subordinated notes in  the principal amount  of $86.25 million  due May  1,
     2003.   The  net  proceeds from  this  offering  were  approximately  $82.7
     million.   Interest  on the  notes is  payable  semiannually on  May 1  and
     November 1 of each  year, commencing November 1, 1996.   The notes will  be
     convertible into common  shares of the Company at  any time after August 5,
     1996, at  the conversion price  of approximately $24.86  per common  share.
     The notes  are subordinated to  present and future  senior indebtedness  of
     the Company and will not restrict the incurrence of future senior or  other
     indebtedness by the Company.

     The  notes are  redeemable,  in whole  or  in part,  at the  option  of the
     Company  on or  after May  1,  1999 at  certain  pre-established redemption
     prices  plus accrued interest.   Upon a change  in control,  the Company is
     required to offer to  purchase all or part of the notes then outstanding at
     a  purchase  price equal  to  100% of  the principal  amount  thereof, plus
     interest.  The repurchase price is payable in cash or, at the option of the
     Company, in common  shares.  



                                          11
<PAGE>






     ITEM 2.   MANAGEMENT'S DISCUSSION AND ANALYSIS OF FINANCIAL 
               CONDITION AND RESULTS OF OPERATIONS

     BACKGROUND

          The Company is  engaged in the research, development and production of
     vaccines for the prevention of infectious diseases in children and adults.

          In  1995, the  Company  recognized  development revenues  pursuant  to
     agreements  with   Pasteur-Merieux  Serums   et  Vaccins,  a   wholly-owned
     subsidiary of  Rhone-Poulenc, which operates in  North America  through its
     subsidiary  Connaught  Laboratories  ("Pasteur  Merieux-Connaught"),  under
     which  the Company  and Pasteur Merieux-Connaught  will jointly develop the
     Company's meningococcus B vaccine.   Additional funding may be  provided to
     the Company  by Pasteur Merieux-Connaught  under the terms  of the clinical
     development agreement.   See  "Outlook; Liquidity  and Capital  Resources,"
     below. 

          In February 1996, the  Swedish Ministry  of Health granted  regulatory
     approval to market  the Company's acellular pertussis vaccine formulated as
     a combined  DTaP vaccine  for the  prevention of  diphtheria, tetanus,  and
     pertussis  (whooping  cough).   This marketing  authorization is  the first
     regulatory approval for  any of  the Company's  products.   Under a  supply
     agreement,  the  Company  manufactures  the  acellular   component  of  the
     vaccine, and Statens Seruminstitut ("SSI") manufactures  the diphtheria and
     tetanus  components and  will  market and  distribute  the DTaP  vaccine in
     Sweden, as  well  as other  Scandinavian  and Baltic  countries  comprising
     SSI's territory.  The Company filed a product license application with  the
     FDA  in September  1995  for approval  to  market its  DTaP  vaccine.   See
     "Outlook; Liquidity & Capital Resources," below.

     RESULTS OF OPERATIONS

     THREE MONTHS ENDED MARCH 31, 1996 AND 1995 

          In  1996,  the  Company recognized  $228,000  of revenue  from product
     sales of  its acellular pertussis  vaccine under the  supply agreement with
     SSI.
      
          Production  expenses  were  $2.9  million in  1996  compared  to  $1.0
     million  in  1995.   The  increase  in these  expenses  in 1996  is  due to
     increases  in depreciation, labor, materials  and supplies  expenses in the
     current year as  the Company prepares for  regulatory approval of its  DTaP
     vaccine in the United  States and produces the DTaP vaccine.   The increase
     in  labor  cost is  primarily  attributable  to an  increase  in  number of
     employees.  In  addition, facility costs in 1996  were greater than in 1995
     due to the Company's placing in service its expanded production facility.

          Research  and development  expenses increased to  $2.7 million in 1996
     from $1.6  million in  1995.   The increase  is primarily  clinical testing
     expenses, which are  the result of  expanding the  clinical and  regulatory


                                          12
<PAGE>






     affairs  operations of  the  Company.    To  a lesser  extent,  there  were
     increases in patent filing expenses over the prior year.

          General and  administrative expenses  were $1.5  million   in 1996  as
     compared to $1.2 million in 1995.  The increase is primarily due to  higher
     labor,  insurance,  and  professional  fees  as  the  Company  prepares for
     regulatory approval to market its DTaP vaccine in the United States.  

          The Company had 168 and 135 full-time  employees as of March 31,  1996
     and 1995, respectively.

          In the first quarter of 1996, the  Company sold 193,084 shares of  its
     investment  in IVAX  Corporation common stock,  which generated proceeds of
     approximately $5.2 million, and a realized gain of $4.2 million.  

          Interest and  dividend  income  decreased to  $119,000  in  1996  from
     $234,000 in 1995.   This decrease is  due primarily to lower  cash balances
     in 1996.

          The factors  cited above  resulted in a  net loss  of $2.5 million  in
     1996 as compared to a net  loss of $3.6 million in 1995.   The net loss per
     share was $0.08 and  $0.12 for  1996 and 1995,  respectively.  Without  the
     $4.2 million gain on the sales of  investment securities, the net  loss per
     share  for 1996  would have  been $0.22.    The weighted-average  number of
     common shares  outstanding  was 30.4  million  for  1996 compared  to  29.4
     million for  1995. The increase  in weighted-average shares outstanding  is
     attributable primarily to exercises of stock options.

     OUTLOOK; LIQUIDITY AND CAPITAL RESOURCES

          The  following paragraphs  contain a  discussion of  the prospects for
     the   Company's  future  operations   and  certain   other  forward-looking
     statements  and  information,  together  with  a  review  of  the Company's
     liquidity and capital resources.   The Company's actual results  may differ
     significantly  from   the  results   discussed  in   the  forward   looking
     statements.

          In  February  1996,  the  Swedish  Medical   Products  Agency  granted
     regulatory approval  to market  the Company's  acellular pertussis  vaccine
     (formulated  as a combined  DTaP vaccine).   This  is the  first regulatory
     approval  for any  of  the Company's  vaccine  products under  development.
     Following  this regulatory  approval, the  Company  recognized $228,000  in
     revenues  from  sale   of  its  acellular  pertussis  vaccine  to  SSI  for
     commercialization in Sweden.   Additional revenues from such  product sales
     are dependent  upon SSI  successfully commercializing  the DTaP  vaccine in
     Sweden.

          SSI has  a  product approval  application  pending  in Denmark  for  a
     combined DTaP-IPV  vaccine and has  indicated that it  will file additional
     applications  for  the  acellular  pertussis  vaccine,  both alone  and  in
     combination with other antigens,  in other countries within  its territory.
     Additional  product approvals  could lead  to increased  revenues  from the

                                          13
<PAGE>






     sale  of  the   Company's  acellular  pertussis  vaccine.    There  are  no
     assurances that these  product approvals will be obtained during 1996 or at
     all, or  that once  obtained SSI  will be  effective in  the marketing  and
     distribution of the product. 

          In September  1995, the Company  filed a  product license  application
     with  the FDA for  approval to market its  DTaP vaccine.  In  the event the
     FDA  approves  the Company's  DTaP  vaccine  and the  Company  successfully
     launches the product  in the United  States, revenues  from operations  and
     the prospects for profitability  would significantly  increase.  There  are
     no assurances that  the FDA's approval will  be obtained during 1996  or at
     all, or that once obtained the Company  will be effective in the  marketing
     and  distribution  of  the  product.    The  factors  affecting  successful
     commercial launch  of the DTaP vaccine in the  United States include, among
     others: establishing  the identity and  reputation for the  Company and its
     products;  creating  an awareness  among  pediatricians of  the  safety and
     efficacy  of  the  Company's DTaP  vaccine;  distinguishing  the  Company's
     product from that  of its competitors;  whether the  Advisory Committee  on
     Immunization  Practices ("ACIP")  and the  American  Academy of  Pediatrics
     issue a nationwide  recommendation for preferred use of acellular pertussis
     vaccines in infants  and children; and establishing  effective distribution
     channels. 

          In connection with  the planned marketing and distribution of the DTaP
     vaccine,  the  Company   is  considering  the  advisability   of  executing
     distribution agreements for certain markets.   The Company also  intends to
     collaborate in the development of  selected vaccine products and  may enter
     into additional collaborative  development agreements similar in  nature to
     that which was signed with  Pasteur Merieux-Connaught, as described  below.
     These agreements,  if executed, would  only impact the Company's  operating
     results in future  periods.  There are no  assurances that the Company will
     successfully negotiate and sign any  such agreements or that,  if executed,
     the   financial  terms   for   any   distribution  agreement   or   further
     collaboration agreement will be significant. 

          In December 1995, the Company signed a clinical  development agreement
     and  license agreement  with  Pasteur  Merieux-Connaught, under  which  the
     parties  agreed to  jointly  develop the  Company's  new conjugate  vaccine
     against  meningococcus   B  infection   for  both   adults  and   pediatric
     indications.   In  1995  the  Company  received  $3  million  from  Pasteur
     Merieux-Connaught,  and  further  fees  and  funding  would  be  made  upon
     achievement  of development,  clinical and  regulatory  milestones.   Total
     fees  and  payments to  the Company  upon achievement  of all  clinical and
     regulatory milestones  would amount  to $52  million.   Achievement of  the
     first milestone,  which is  the satisfactory  completion of  a pre-clinical
     study and  ratification of the  license agreement by  the National Research
     Council of  Canada, a  Canadian federal  government agency  (NRC), both  of
     which are anticipated to occur during 1996,  would result in total payments
     from Pasteur  Merieux-Connaught of  $10 million  during the  course of  the
     year.   The Company's  revenues from  this collaboration  will depend  upon
     achievement of  the  development milestones.    The  time it  may  take  to
     achieve  these milestones cannot be predicted  accurately and no assurances

                                          14
<PAGE>





     can be given that any or all of these milestones will be  achieved  at  all
     or within  the time  frames  projected.   In  addition,   Pasteur  Merieux-
     Connaught  may terminate these agreements  in its  sole discretion  at  any
     time after December 22, 1996. 

          The Company's cash  requirements for  operations were $5.3  million in
     the fourth quarter of 1995  and $7.2 million for the first quarter of 1996.
     At  March   31,  1996,  the  Company  had  cash  and  cash  equivalents  of
     approximately $10.0 million and investment securities  in an affiliate with
     a market  value of $3.2  million.  The  investment securities consisted  of
     125,000 shares  of IVAX  common  stock.   The fair  market value  of  these
     investment  securities  as  of  May  9,  1996  was  $3.5  million.    These
     investments are volatile and therefore subject  to significant fluctuations
     in value.

          Total capital expenditures  for the first  quarter of  1996 were  $1.1
     million, which  were primarily for  production equipment.   The Company has
     been  exploring opportunities  to build-out,  lease  or acquire  additional
     research, development  and clinical  production  facilities to  accommodate
     the Company's  expanding vaccine development  program.  The  Company has no
     present  agreements,  commitments  or  understandings  in  respect  of  any
     additional  facilities  and  the total  capital  expenditures  for  such  a
     project  will  vary  substantially  depending  upon  a  number  of  factors
     including, among other things,  the size of such a  facility, the equipment
     and systems  requirements  for the  facility,  location, zoning  and  other
     government restrictions.   Total  projected capital  expenditures for  1996
     are  expected to  be approximately  $3 million,  exclusive of  expenditures
     associated with  the build-out,  acquisition or  improvement of  additional
     facilities.   The projected capital expenditures could fluctuate based upon
     a number  of factors  including unanticipated  costs to  replace or  repair
     existing equipment and  systems in order  to keep  the production  facility
     operational or to maintain compliance with regulatory requirements.

          The Company  anticipates that cash requirements for operations will be
     between approximately $9  and $10 million in the  second quarter of 1996 as
     the  Company  expands production  for  commercial  sale  in  Europe and  in
     anticipation of  regulatory  approval in  the United  States.   Thereafter,
     cash requirements  for operations  will depend  upon the  level of  vaccine
     production, costs  in preparing  for the  market introduction  of its  DTaP
     vaccine, and the level of  expenditures for the Company's  ongoing research
     and development program.

          In May  1996, the Company completed  an offering  of 6.50% convertible
     subordinated  notes in  the principal amount  of $86.25 million  due May 1,
     2003.    The net  proceeds  from  this  offering  were approximately  $82.7
     million.   Interest  on  the notes  is payable  semiannually  on May  1 and
     November 1 of each  year, commencing November 1,  1996.  The notes will  be
     convertible into common shares  of the Company at any time after  August 5,
     1996.   The  notes  also  are subordinated  to  present and  future  senior
     indebtedness of the Company and will not restrict the  incurrence of future
     senior or other indebtedness by the Company.



                                          15
<PAGE>






          The notes are redeemable, in  whole or in part,  at the option of  the
     Company  on or  after  May 1,  1999  at certain  pre-established redemption
     prices, plus accrued  interest.  Upon a  change in control, the  Company is
     required to offer to purchase all or part of  the notes then outstanding at
     a purchase  price  equal to  100% of  the  principal amount  thereof,  plus
     interest. The repurchase price is  payable in cash or, at the option of the
     Company, in common  shares.  

          The  quarterly operating results  for the  remaining quarters  in 1996
     may  fluctuate significantly  based  upon a  number  of factors  including,
     among other things: the  magnitude of sales of product  for distribution in
     Europe;   the timing of FDA  approval for, and  the commercial introduction
     of, the  DTaP  vaccine;  the  timing  of  the  satisfactory  completion  of
     milestones under the development agreement  with Pasteur Merieux-Connaught;
     the timing  and  amount  of payments  under  any  additional  collaboration
     agreement or  distribution  agreement; and  the  timing  of and  amount  of
     proceeds from the  sale of additional  investment securities.   There  are,
     however,  no assurances  that  any  further  regulatory approvals  will  be
     received,  or that  development  milestones will  be  achieved, or  that if
     obtained will contribute  materially to the quarterly operating  results of
     the  Company.    Further,  failure  or  significant   delays  in  receiving
     additional regulatory approvals and meeting required  milestones would have
     a significant adverse  effect on the Company's future operating results and
     future financial position.

     TAX AND OTHER MATTERS

          At December 31,  1995, the Company and its subsidiaries had income tax
     loss carryforwards of  approximately $11 million to offset  future Canadian
     source  income  and approximately  $48.5  million to  offset  future United
     States taxable income subject to  the alternative minimum tax rules in  the
     United States.




















                                          16
<PAGE>






                              PART II  OTHER INFORMATION


     ITEM 6.   EXHIBITS AND REPORTS ON FORM 8-K

          (a)  Exhibits

                Exhibit No.           Description

                10.29                 Indenture dated May 7, 1996
                                      between North American Vaccine,
                                      Inc. ("NAV") and Marine Midland
                                      Bank.

                10.30                 Registration Rights Agreement
                                      dated May 1, 1996 among NAV,
                                      Goldman Sachs & Co. and UBS
                                      Securities LLC

                27                    Financial Data Schedule

          (b)  Reports on Form 8-K

               On January  16, 1996, the Company  filed with  the Securities and
               Exchange  Commission a  Current Report on  Form 8-K  under Item 5
               reporting  the  signing  of  definitive  agreements  between  the
               Company  and  Pasteur  Merieux-Connaught,  whereby the  companies
               would  jointly   develop  a   vaccine  against   meningococcus  B
               infection.
























                                          17
<PAGE>






                                     SIGNATURES


          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.


                                   NORTH AMERICAN VACCINE, INC. 
                                   (Registrant)


                                   By:  /s/ Sharon Mates                     
                                        -------------------------------------
                                        Sharon Mates, Ph.D.
                                        President


                                   By:  /s/ Lawrence J. Hineline           
                                        -----------------------------------
                                        Lawrence J. Hineline
                                        Vice President - Finance



     Date:   May 14, 1996



























                                          18
<PAGE>

<PAGE>

                             NORTH AMERICAN VACCINE, INC.

                                       ISSUER

                                          TO

                                 MARINE MIDLAND BANK

                                       TRUSTEE

                                   ===============


                                      INDENTURE

                               Dated as of May 7, 1996

                                   ===============


                                   U.S.$86,250,000

                         6.50% Convertible Subordinated Notes
                                   Due May 1, 2003
<PAGE>






                                  TABLE OF CONTENTS
                                     ===========


                                                                            Page
                                                                            ----

     RECITALS OF THE COMPANY . . . . . . . . . . . . . . . . . . . . . . . .   1

                                     ARTICLE ONE

                           DEFINITIONS AND OTHER PROVISIONS
                                OF GENERAL APPLICATION


     SECTION 1.1.  Definitions . . . . . . . . . . . . . . . . . . . . . . .   1
      
     SECTION 1.2.  Compliance Certificates and Opinions  . . . . . . . . . .  10

     SECTION 1.3.  Form of Documents Delivered to the Trustee  . . . . . . .  11

     SECTION 1.4.  Acts of Holders of Securities . . . . . . . . . . . . . .  12

     SECTION 1.5.  Notices, Etc., to Trustee and Company . . . . . . . . . .  13

     SECTION 1.6.  Notice to Holders of Securities; Waiver . . . . . . . . .  14

     SECTION 1.7.  Effect of Headings and Table of Contents  . . . . . . . .  14

     SECTION 1.8.  Successors and Assigns  . . . . . . . . . . . . . . . . .  14

     SECTION 1.9.  Separability Clause . . . . . . . . . . . . . . . . . . .  14

     SECTION 1.10.  Benefits of Indenture  . . . . . . . . . . . . . . . . .  14

     SECTION 1.11.  Governing Law  . . . . . . . . . . . . . . . . . . . . .  15

     SECTION 1.12.  Legal Holidays . . . . . . . . . . . . . . . . . . . . .  15

     SECTION 1.13.  Consent to Jurisdiction and Service of Process . . . . .  15

     SECTION 1.14.  Conversion of Currency . . . . . . . . . . . . . . . . .  16

     SECTION 1.15.  Currency Equivalent  . . . . . . . . . . . . . . . . . .  17

     SECTION 1.16.  Interest Act (Canada)  . . . . . . . . . . . . . . . . .  18

     SECTION 1.17.  Conflict with Trust Indenture Act  . . . . . . . . . . .  18

     This Table of Contents  shall not, for any purpose, be  deemed to be a part
     of the Indenture.
     ==========================================================================

                                        - i -
<PAGE>






                                     ARTICLE TWO

                                    SECURITY FORMS

                                                                            Page
                                                                            ----


     SECTION 2.1.  Forms Generally . . . . . . . . . . . . . . . . . . . . .  18

     SECTION 2.2.  Forms of Securities . . . . . . . . . . . . . . . . . . .  21

     SECTION 2.3.  Form of Conversion Notice . . . . . . . . . . . . . . . .  42

     SECTION 2.4.  Legend on Restricted Securities . . . . . . . . . . . . .  42

     SECTION 2.5  Form of Trustee's Certificate of Authentication  . . . . .  42


                                    ARTICLE THREE

                                    THE SECURITIES

     SECTION 3.1.  Title and Terms . . . . . . . . . . . . . . . . . . . . .  42

     SECTION 3.2.  Denominations . . . . . . . . . . . . . . . . . . . . . .  43

     SECTION 3.3.  Execution, Authentication, Delivery and Dating  . . . . .  43

     SECTION 3.4.  Global Securities . . . . . . . . . . . . . . . . . . . .  44

     SECTION 3.5.  Registration, Registration of Transfer and Exchange;
                   Restrictions on Transfer  . . . . . . . . . . . . . . . .  46

     SECTION 3.6.  Mutilated, Destroyed, Lost or Stolen Securities . . . . .  52

     SECTION 3.7.  Payment of Interest, Interest Rights Preserved  . . . . .  53

     SECTION 3.8.  Persons Deemed Owners . . . . . . . . . . . . . . . . . .  55

     SECTION 3.9.  Cancellation  . . . . . . . . . . . . . . . . . . . . . .  55

     SECTION 3.10.  Computation of Interest  . . . . . . . . . . . . . . . .  55

     SECTION 3.11.  CUSIP Numbers  . . . . . . . . . . . . . . . . . . . . .  55

     SECTION 3.12.  Notification of Withholding  . . . . . . . . . . . . . .  55


     This Table of Contents  shall not, for any purpose, be  deemed to be a part
     of the Indenture.
     ==========================================================================

                                        - ii -
<PAGE>






                                     ARTICLE FOUR

                              SATISFACTION AND DISCHARGE
                                                                            Page
                                                                            ----

     SECTION 4.1.  Satisfaction and Discharge of Indenture . . . . . . . . .  56

     SECTION 4.2.  Application of Trust Money  . . . . . . . . . . . . . . .  57


                                     ARTICLE FIVE

                                       REMEDIES

     SECTION 5.1.  Events of Default . . . . . . . . . . . . . . . . . . . .  57

     SECTION 5.2.  Acceleration of Maturity; Rescission and Annulment  . . .  60

     SECTION 5.3.  Collection of Indebtedness and Suits for Enforcement 
                   by Trustee  . . . . . . . . . . . . . . . . . . . . . . .  61

     SECTION 5.4.  Trustee May File Proofs of Claim  . . . . . . . . . . . .  61

     SECTION 5.5.  Trustee May Enforce Claims Without Possession 
                   of Securities . . . . . . . . . . . . . . . . . . . . . .  62

     SECTION 5.6.  Application of Money Collected  . . . . . . . . . . . . .  63

     SECTION 5.7.  Limitation on Suits . . . . . . . . . . . . . . . . . . .  63

     SECTION 5.8.  Unconditional Right of Holders to Receive Principal, 
                   Premium and Interest and to Convert . . . . . . . . . . .  64

     SECTION 5.9.  Restoration of Rights and Remedies  . . . . . . . . . . .  64

     SECTION 5.10.  Rights and Remedies Cumulative . . . . . . . . . . . . .  64

     SECTION 5.11.  Delay or Omission Not Waiver . . . . . . . . . . . . . .  64

     SECTION 5.12.  Control by Holders of Securities . . . . . . . . . . . .  65

     SECTION 5.13.  Waiver of Past Defaul  . . . . . . . . . . . . . . . . .  65

     SECTION 5.14.  Undertaking for Costs  . . . . . . . . . . . . . . . . .  65

     SECTION 5.15.  Waiver of Stay or Extension Laws . . . . . . . . . . . .  66


     This Table of Contents  shall not, for any purpose, be  deemed to be a part
     of the Indenture.
     ==========================================================================

                                       - iii -
<PAGE>






                                     ARTICLE SIX

                                     THE TRUSTEE

                                                                            Page
                                                                            ----

     SECTION 6.1.  Certain Duties and Responsibilities . . . . . . . . . . .  66

     SECTION 6.2.  Notice of Defaults  . . . . . . . . . . . . . . . . . . .  67

     SECTION 6.3.  Certain Rights of Trustee . . . . . . . . . . . . . . . .  68

     SECTION 6.4.  Not Responsible for Recitals or Issuance of 
                   Securities  . . . . . . . . . . . . . . . . . . . . . . .  69

     SECTION 6.5.  May Hold Securities, Act as Trustee Under Other 
                   Indentures  . . . . . . . . . . . . . . . . . . . . . . .  69

     SECTION 6.6.  Money Held in Trust . . . . . . . . . . . . . . . . . . .  69

     SECTION 6.7.  Compensation and Reimbursemen . . . . . . . . . . . . . .  70

     SECTION 6.8.  Corporate Trustee Required; Eligibility . . . . . . . . .  70

     SECTION 6.9.  Resignation and Removal; Appointment of Successor . . . .  71

     SECTION 6.10.  Acceptance of Appointment by Successor . . . . . . . . .  72

     SECTION 6.11.  Merger, Conversion, Consolidation or Succession 
                    to Business  . . . . . . . . . . . . . . . . . . . . . .  73

     SECTION 6.12.  Authenticating Agents  . . . . . . . . . . . . . . . . .  73

     SECTION 6.13  Trust Indenture Legislation . . . . . . . . . . . . . . .  74


                                    ARTICLE SEVEN

                         AMALGAMATION, CONSOLIDATION, MERGER,
                            CONVEYANCE, TRANSFER OR LEASE


     SECTION 7.1.  Company May Amalgamate, Consolidate, Etc., Only on 
                   Certain Terms . . . . . . . . . . . . . . . . . . . . . .  75

     SECTION 7.2.  Successor Substituted . . . . . . . . . . . . . . . . . .  76


     This Table of Contents  shall not, for any purpose, be  deemed to be a part
     of the Indenture.
     ==========================================================================

                                        - iv -
<PAGE>






                                    ARTICLE EIGHT

                               SUPPLEMENTAL INDENTURES

                                                                            Page
                                                                            ----

     SECTION 8.1.  Supplemental Indentures Without Consent of Holders of 
                   Securities  . . . . . . . . . . . . . . . . . . . . . . .  76

     SECTION 8.2.  Supplemental Indentures with Consent of Holders of
                   Securities  . . . . . . . . . . . . . . . . . . . . . . .  77

     SECTION 8.3.  Execution of Supplemental Indentures  . . . . . . . . . .  78

     SECTION 8.4.  Effect of Supplemental Indentures . . . . . . . . . . . .  79

     SECTION 8.5.  Reference in Securities to Supplemental Indentures  . . .  79

     SECTION 8.6.  Notice of Supplemental Indentures . . . . . . . . . . . .  79


                                     ARTICLE NINE

                          MEETINGS OF HOLDERS OF SECURITIES

     SECTION 9.1.  Purposes for Which Meetings May Be Called . . . . . . . .  79

     SECTION 9.2.  Call, Notice and Place of Meetings  . . . . . . . . . . .  79

     SECTION 9.3.  Persons Entitled to Vote at Meetings  . . . . . . . . . .  80

     SECTION 9.4.  Quorum; Action  . . . . . . . . . . . . . . . . . . . . .  80

     SECTION 9.5.  Determination of Voting Rights; Conduct and Adjournmet 
                   of Meetings . . . . . . . . . . . . . . . . . . . . . . .  81

     SECTION 9.6.  Counting Votes and Recording Action of Meetings . . . . .  82


                                     ARTICLE TEN

                                      COVENANTS

     SECTION 10.1.  Payment of Principal, Premium and Interest . . . . . . .  82

     SECTION 10.2.  Maintenance of Offices or Agencies . . . . . . . . . . .  83


     This Table of Contents  shall not, for any purpose, be  deemed to be a part
     of the Indenture.
     ==========================================================================

                                        - v -
<PAGE>






     SECTION 10.3.  Money for Security Payments To Be Held in Trust  . . . .  83

     SECTION 10.4.  Additional Amounts . . . . . . . . . . . . . . . . . . .  84

     SECTION 10.5.  Existence  . . . . . . . . . . . . . . . . . . . . . . .  85

     SECTION 10.6.  Maintenance of Properties  . . . . . . . . . . . . . . .  85

     SECTION 10.7.  Payment of Taxes and Other Claims  . . . . . . . . . . .  86

     SECTION 10.8.  Registration and Listing . . . . . . . . . . . . . . . .  86

     SECTION 10.9.  Statement by Officers as to Default  . . . . . . . . . .  86

     SECTION 10.10.  Delivery of Certain Informatio  . . . . . . . . . . . .  87

     SECTION 10.11.  Reporting Issuer  . . . . . . . . . . . . . . . . . . .  87

     SECTION 10.12.  Registration Rights . . . . . . . . . . . . . . . . . .  88

     SECTION 10.13.  Waiver of Certain Covenants . . . . . . . . . . . . . .  89


                                    ARTICLE ELEVEN

                               REDEMPTION OF SECURITIES

     SECTION 11. 1.  Right of Redemption . . . . . . . . . . . . . . . . . .  89

     SECTION 11.2.  Applicability of Article . . . . . . . . . . . . . . . .  89

     SECTION 11.3.  Election to Redeem; Notice to Trustee  . . . . . . . . .  89

     SECTION 11.4.  Selection by Trustee of Securities to Be Redeemed  . . .  90

     SECTION 11.5.  Notice of Redemption . . . . . . . . . . . . . . . . . .  90

     SECTION 11.6.  Deposit of Redemption Price  . . . . . . . . . . . . . .  91

     SECTION 11.7.  Securities Payable on Redemption Dat . . . . . . . . . .  92

     SECTION 11.8.  Securities Redeemed in Part  . . . . . . . . . . . . . .  92







     This Table of Contents  shall not, for any purpose, be  deemed to be a part
     of the Indenture.
     ==========================================================================

                                        - vi -
<PAGE>






                                    ARTICLE TWELVE

                               CONVERSION OF SECURITIES

                                                                            Page
                                                                            ----

     SECTION 12.1.  Conversion Privilege and Conversion Price  . . . . . . .  92

     SECTION 12.2.  Exercise of Conversion Privilege . . . . . . . . . . . .  93

     SECTION 12.3.  Fractions of Shares  . . . . . . . . . . . . . . . . . .  94

     SECTION 12.4.  Adjustment of Conversion Price . . . . . . . . . . . . .  95

     SECTION 12.5.  Notice of Adjustments of Conversion Price  . . . . . . .  99

     SECTION 12.6.  Notice of Certain Corporate Action   . . . . . . . . .   100

     SECTION 12.7.  Company to Reserve Common Shares   . . . . . . . . . .   101

     SECTION 12.8.  Taxes on Conversions   . . . . . . . . . . . . . . . .   101

     SECTION 12.9.  Covenant as to Common Shares   . . . . . . . . . . . .   101

     SECTION 12.10.  Cancellation of Converted Securities  . . . . . . . .   101

     SECTION 12.11.  Provision in Case of Amalgamation, Consolidation, 
                     Merger or Sale of Assets  . . . . . . . . . . . . . .   102

     SECTION 12.12.  Responsibility of Trustee for Conversion Provision  .   103


                                  ARTICLE THIRTEEN

                             SUBORDINATION OF SECURITIES

     SECTION 13.1.  Securities Subordinated to Senior Indebtedness . . . .   104

     SECTION 13.2.  No Payments in Certain Circumstances; Payment Over 
                    of Proceeds Upon Dissolution, Etc  . . . . . . . . . .   104

     SECTION 13.3.  Notice to Trustee of Specified Events; Reliance on
                    Certificate of Liquidating Agent . . . . . . . . . . .   106

     SECTION 13.4.  Trustee to Effectuate Subordination  . . . . . . . . .   107

     SECTION 13.5.  Trustee Not Charged with Knowledge of Prohibition  . .   107

     This Table of Contents  shall not, for any purpose, be  deemed to be a part
     of the Indenture.
     ==========================================================================

                                       - vii -
<PAGE>






     SECTION 13.6.  Reliance on Judicial Order or Certificate of 
                    Liquidating Agent  . . . . . . . . . . . . . . . . . .   108

     SECTION 13.7.  Trustee Not Fiduciary for Holders of Senior 
                    Indebtedness . . . . . . . . . . . . . . . . . . . . .   108

     SECTION 13.8.  Rights of Trustee as Holder of Senior Indebtedness;
                      Preservation Of Trustee's Rights . . . . . . . . . .   108

     SECTION 13.9.  Article Applicable to Paying Agents  . . . . . . . . .   109

     SECTION 13.10. Certain Conversions Deemed Payment . . . . . . . . . .   109


                                  ARTICLE FOURTEEN

                    REPURCHASE OF SECURITIES AT THE OPTION OF THE
                           HOLDER UPON A CHANGE IN CONTROL

     SECTION 14.1.  Right to Require Repurchase  . . . . . . . . . . . . .   109

     SECTION 14.2.  Notices; Method of Exercising Repurchase Right, Etc  .   110

     SECTION 14.3.  Certain Definitions  . . . . . . . . . . . . . . . . .   114


                                   ARTICLE FIFTEEN

                   HOLDERS LISTS AND REPORTS BY TRUSTEE AND COMPANY


     SECTION 15.1.  Company to Furnish Trustee Names and Addresses of
                    Holders  . . . . . . . . . . . . . . . . . . . . . . .   115

     SECTION 15.2.  Preservation of Information  . . . . . . . . . . . . .   115














     This Table of Contents  shall not, for any purpose, be  deemed to be a part
     of the Indenture.
     ==========================================================================

                                       - viii -
<PAGE>






           INDENTURE, dated as of May 7,  1996, between NORTH AMERICAN  VACCINE,
     INC., a corporation duly organized and  existing under the laws of  Canada,
     having  its  principal office  at  12103  Indian Creek  Court,  Beltsville,
     Maryland (herein  called the  "Company"), and  MARINE MIDLAND  BANK, a  New
     York banking corporation  and trust  company, as Trustee  hereunder (herein
     called the "Trustee").

                               RECITALS OF THE COMPANY

           The  Company  has duly  authorized the  creation of  an issue  of its
     6.50% Convertible Subordinated  Notes due May  1, 2003  (herein called  the
     "Securities") of substantially the tenor and  amount hereinafter set forth,
     and to provide therefor the Company  has duly authorized the execution  and
     delivery of this Indenture.

           All things necessary to make the  Securities, when the Securities are
     executed  by the  Company and  authenticated and  delivered hereunder,  the
     valid  obligations of  the  Company, and  to  make this  Indenture a  valid
     agreement  of the  Company, in accordance  with their  and its  terms, have
     been done.   Further, all things  necessary to duly authorize  the issuance
     of  the Common Shares  of the Company issuable  upon the  conversion of the
     Securities, and  to duly reserve  for issuance the number  of Common Shares
     issuable upon such conversion, have been done.

           NOW, THEREFORE, THIS INDENTURE WITNESSETH:

           For and  in consideration  of the  premises and the  purchase of  the
     Securities by the  Holders thereof it  is mutually  covenanted and  agreed,
     for  the equal and proportionate  benefit of all  Holders of the Securities
     as follows:

                                     ARTICLE ONE

                           DEFINITIONS AND OTHER PROVISIONS
                                OF GENERAL APPLICATION

     SECTION 1.1.  Definitions.
                   -----------

           For  all purposes  of this  Indenture, except as  otherwise expressly
     provided or unless the context otherwise requires:

                  (1) the  terms  defined  in  this Article  have  the  meanings
           assigned to them  in this Article and include  the plural as well  as
           the singular;

                  (2)  all accounting  terms not  otherwise defined  herein have
           the meanings assigned  to them in accordance with generally  accepted
           accounting  principles in the United States, and, except as otherwise
           herein expressly  provided, the term  "generally accepted  accounting
           principles" with  respect to  any computation  required or  permitted
           hereunder  shall mean  such accounting  principles as  are  generally
           accepted at the date of such computation; and
<PAGE>






                  (3)  the words  "herein", "hereof"  and "hereunder"  and other
           words of similar  import refer to this Indenture  as a whole and  not
           to any particular Article, Section or other subdivision.

           "Act", when used  with respect to any Holder  of a Security, has  the
     meaning specified in Section 1.4.

           "Additional Amounts" has the meaning specified in Section 2.2.

           "Affiliate" of any specified  Person means any  other Person directly
     or indirectly  controlling or  controlled by  or under  direct or  indirect
     common control  with  such specified  Person.   For  the purposes  of  this
     definition,  "control",  when used  with  respect to  any  specified Person
     means  the power  to direct  the management  and policies  of  such Person,
     directly  or   indirectly,  whether   through  the   ownership  of   voting
     securities,  by  contract or  otherwise;  and the  terms  "controlling" and
     "controlled" have meanings correlative to the foregoing.

           "Agent  Member"  means  any   member  of,  or   participant  in,  the
     Depositary.

           "Applicable Procedures" has the meaning in Section 3.5(c).

           "Authenticating  Agent"  means  any  Person  authorized  pursuant  to
     Section 6.12 to act on behalf of the Trustee to authenticate Securities.

           "Board  of Directors"  means either  the  board  of directors  of the
     Company  or  any committee  of  that board  empowered  to act  for  it with
     respect to this Indenture.

           "Board Resolution"  means a resolution duly  adopted by  the Board of
     Directors,  a copy  of which,  certified by  the Secretary or  an Assistant
     Secretary  of the  Company  to  have been  duly  adopted  by the  Board  of
     Directors  and to  be  in  full  force  and  effect on  the  date  of  such
     certification, shall have been delivered to the Trustee.

           "Business  Day", when  used with  respect  to  any Place  of Payment,
     Place of  Conversion or any  other place,  as the case  may be, means  each
     Monday, Tuesday,  Wednesday, Thursday  and  Friday which  is not  a day  on
     which banking  institutions in such  Place of Payment,  Place of Conversion
     or other  place, as the case may be, are authorized  or obligated by law or
     executive order  to close; provided, however,  that a day on  which banking
     institutions in New  York, New York are  authorized or obligated by  law or
     executive  order to  close shall  not be  a  Business Day  for purposes  of
     Section 13.5; provided, further, that  a day on which  banking institutions
     in New York, New  York or  London, England are  authorized or obligated  by
     law or executive order to  close shall not be  a Business Day for  purposes
     of Sections 10.1, 10.3 or 11.6.

           "Canadian   Additional  Amounts"   has  the   meaning  specified   in
     Section 2.2.


                                        - 2 -
<PAGE>






           "Canadian Excluded Holder" has the meaning specified in Section 2.2.

           "Canadian Taxes" has the meaning specified in Section 2.2.

           "Cedel" has the meaning specified in Section 2.1.

           "Change in Control" has the meaning specified in Section 14.3.

           "Closing Price Per  Share" means, with respect  to a class of  Common
     Stock of the  Company, for any day,  the reported last sales  price regular
     way per  share of such class or, in  case no such reported sale takes place
     on such  day, the  average of  the reported  closing bid  and asked  prices
     regular way, in  either case  (i) on  Nasdaq or,  if such  class of  Common
     Stock is  not quoted  on Nasdaq,  on the  principal (as  determined by  the
     Company's Board  of Directors) United  States national securities  exchange
     on which  such class  of  Common Stock  is quoted,  listed or  admitted  to
     trading or (ii)  if not quoted on  Nasdaq or listed or admitted  to trading
     on  any United  States  national securities  exchange,  the average  of the
     closing bid  and asked prices  in the over-the-counter  market as furnished
     by any New York  Stock Exchange member firm  selected from time to time  by
     the Company  for that purpose or (iii) if not so available in either manner
     set forth in  (i) or  (ii), as otherwise  determined in good  faith by  the
     Board of Directors.

           "Commission"  means  the  United   States  Securities  and   Exchange
     Commission.

           "Common Shares" means the  Common Shares, with  no par value, of  the
     Company authorized at the date  of this instrument as  originally executed.
     Subject  to  the   provisions  of  Section  12.11,  shares   issuable  upon
     conversion of Securities shall include only Common  Shares or shares of any
     class  or classes  of  Common Stock  resulting  from any  classification or
     reclassification  thereof; provided,  however,  that if  at  any time  as a
     result of such  classification or reclassification there shall be more than
     one  such  resulting class,  the  shares  so  issuable  upon conversion  of
     Securities shall  include shares  of all such  classes, and  the number  of
     shares of each such  class then so issuable shall be in the same proportion
     which the  total number  of shares of  such class  resulting from all  such
     reclassification bears to  the total number  of shares of all  such classes
     resulting from all such reclassification.

           "Common Stock" means the Company's Common  Shares, with no par value,
     together with any other class of capital stock of  the Company which has no
     preference in respect  of dividends or of  amounts payable in the  event of
     any voluntary or  involuntary liquidation, dissolution or winding up of the
     Company and which is not subject to redemption by the Company.

           "Company" means  the  Person named  as  the  "Company" in  the  first
     paragraph of this  instrument until a  successor Person  shall have  become
     such  pursuant  to  the  applicable  provisions  of  this  Indenture,   and
     thereafter "Company" shall mean such successor Person.


                                        - 3 -
<PAGE>






           "Company  Request" or  "Company  Order"  means a  written request  or
     order signed in the name of the Company  by its Chairman of the Board,  any
     Vice Chairman  of the Board, its Chief Executive  Officer, its President or
     any Senior Vice President, and  by its Corporate Controller,  Treasurer, an
     Assistant  Treasurer,  its  Secretary  or  any   Assistant  Secretary,  and
     delivered to the Trustee.

           "Constituent Person" has the meaning specified in Section 12.11.

           "Conversion Agent"  means any  Person  authorized by  the Company  to
     convert Securities  in accordance  with Article  Twelve.   The Company  has
     initially appointed the Trustee  as its Conversion Agent in  the Borough of
     Manhattan, The City of  New York,  and Midland Bank  plc as its  Conversion
     Agent in London, England.

           "Conversion Price" has the meaning specified in Section 12.1.

           "Corporate Trust Office" means the office  of the Trustee at which at
     any  particular  time its  corporate  trust business  shall  be principally
     administered  (which at  the  date  of this  Indenture  is located  at  140
     Broadway, 12th Floor, New York, New York 10005.

           "Corporation"  means  a  corporation,  company,  including,   without
     limitation, a  limited liability company, association,  joint-stock company
     or business trust.

           "Defaulted Interest" has the meaning specified in Section 3.7.

           "Definitive  Security"  means  any  Security  (other  than  a  Global
     Security).

           "Definitive  Restricted  Security"   has  the  meaning  specified  in
     Section 2.1.

           "Depositary" means,  with respect to any  Securities issued in  whole
     or  in part  in the  form of  one or  more Global  Securities, the clearing
     agency that is  registered under the Exchange Act  and designated to act as
     Depositary for  such Securities,  as contemplated  by Section  3.4, or  any
     successor   clearing  agency   registered  under   the   Exchange  Act   as
     contemplated by Section 3.4.

           "Determination Notice" has the meaning specified in Section 2.2(a).

           "Distribution Date" has the meaning specified in Section 12.4(4).

           "Dollar" or "U.S.$" means a dollar or  other equivalent unit in  such
     coin or currency  of the United States as at the time shall be legal tender
     for the payment of public and private debts.

           "Euroclear" has the meaning specified in Section 2.1.

           "Event of Default" has the meaning specified in Section 5.1.

                                        - 4 -
<PAGE>






           "Exchange Act"  means the  United States  Securities Exchange  Act of
     1934, as amended from time at time.

           "Exchange  Date" means  the date  40  days after  the latest  of  the
     commencement of the offering of the Securities, the original  issue date of
     the Securities or the issue date with respect to any additional  Securities
     issued to cover over-allotments.

           "Excluded Holder" has the meaning specified in Section 2.2.

           "Global Security" means  any of the  Restricted Global  Security, the
     Regulation  S Global  Security  and the  Unrestricted  Global Security  and
     registered in  the Security  Register  in the  name of  a Depositary  or  a
     nominee thereof.

           "Holder", when  used with respect to  any Security,  means the Person
     in whose name the Security is registered in the Security Register.

           "Indenture" means  this instrument  as originally  executed or  as it
     may from time to time be supplemented or amended by  one or more indentures
     supplemental  hereto entered  into pursuant  to  the applicable  provisions
     hereof.

           "Institutional Accredited Investor"  means an institution that is  an
     "accredited investor"  as defined under Rule 501(a)(1), (2),  (3) or (7) of
     the Securities Act.

           "Interest Payment Date" means  the Stated Maturity  of an installment
     of interest on the Securities.

           "Maturity", when  used with respect to  any Security,  means the date
     on which the principal of such Security becomes  due and payable as therein
     or herein provided,  whether at  the Stated Maturity  or by declaration  of
     acceleration, call  for redemption,  exercise of the  repurchase right  set
     forth in Article Fourteen or otherwise.

           "Nasdaq" means the Nasdaq National Market System.

           "Non-electing Share" has the meaning specified in Section 12.11.

           "Officers' Certificate"  means a certificate  signed by the  Chairman
     of the Board, any  Vice Chairman of the Board, the Chief Executive Officer,
     the  President  or  any  Senior   Vice  President  and  by   the  Corporate
     Controller,  the Treasurer,  an Assistant  Treasurer, the  Secretary or  an
     Assistant Secretary of the Company, and delivered to the Trustee.

           "Opinion of  Counsel" means a written opinion of counsel,  who may be
     counsel  for, or an  employee of, the Company  and who  shall be reasonably
     acceptable to the Trustee.




                                        - 5 -
<PAGE>






           "Outstanding", when  used with  respect to  Securities, means,  as of
     the date  of determination,  all Securities  theretofore authenticated  and
     delivered under this Indenture, except:

                  (i)  Securities  theretofore   canceled  by  the   Trustee  or
           delivered to the Trustee for cancellation;

                  (ii) Securities for  the payment or redemption  of which money
           in  the  necessary  amount has  been theretofore  deposited  with the
           Trustee  or any  Paying Agent (other  than the Company)  or set aside
           and segregated in trust  by the Company (if the Company shall act  as
           its own  Paying Agent) for the  Holders of  such Securities, provided
           that  if  such  Securities  are  to   be  redeemed,  notice  of  such
           redemption  has  been  duly  given  pursuant  to  this  Indenture  or
           provision therefor satisfactory to the Trustee has been made; and

                  (iii) Securities which have  been paid pursuant to Section 3.6
           or in  exchange for or  in lieu of  which other  Securities have been
           authenticated and  delivered pursuant to  this Indenture, other  than
           any  such  Securities in  respect  of  which  there  shall have  been
           presented  to  the  Trustee  proof  satisfactory  to  it  that   such
           Securities  are held  by a  bona fide  purchaser in whose  hands such
           Securities are valid obligations of the Company;

     provided,  however,  that  in   determining  whether  the  Holders  of  the
     requisite  principal amount  of  Outstanding Securities  are  present at  a
     meeting of  Holders of  Securities for  quorum purposes  or have given  any
     request,  demand,  authorization,  direction,  notice,  consent  or  waiver
     hereunder,  Securities owned by the  Company or any  other obligor upon the
     Securities or any Affiliate of the Company  or such other obligor shall  be
     disregarded and deemed not to  be Outstanding, except that,  in determining
     whether  the  Trustee  shall  be   protected  in  relying  upon   any  such
     determination as to  the presence  of a quorum  or upon  any such  request,
     demand,  authorization,   direction,  notice,  consent   or  waiver,   only
     Securities which a  Responsible Officer of the Trustee actually knows to be
     so owned shall  be so  disregarded.  Securities  so owned  which have  been
     pledged  in good  faith  may  be regarded  as  Outstanding if  the  pledgee
     establishes  to the satisfaction  of the Trustee the  pledgee's right so to
     act with  respect  to such  Securities  and that  the  pledgee is  not  the
     Company or any  other obligor upon the  Securities or any Affiliate  of the
     Company or such other obliger.

           "Paying  Agents" means any  Person authorized  by the  Company to pay
     the principal  of or interest  on any Securities  on behalf of the  Company
     and, except as  otherwise specifically set  forth herein,  such term  shall
     include the  Company if it shall act as  its own Paying Agent.  The Company
     has initially appointed the  Trustee as its Paying Agent in the  Borough of
     Manhattan, The City  of New York and  Midland Bank plc, located  at Mariner
     House, Pepys  Street,  London EC3N  4DA, England  as  its Paying  Agent  in
     London, England.



                                        - 6 -
<PAGE>






           "Person"  means  any  individual,   corporation,  partnership,  joint
     venture, trust,  estate, unincorporated organization  or government or  any
     agency or political subdivision thereof.

           "Place of Conversion" has the meaning specified in Section 3.1.

           "Place of Payment" has the meaning specified in Section 3.1.

           "Predecessor  Security"  of   any  particular  Security  means  every
     previous  Security evidencing all  or a  portion of  the same debt  as that
     evidenced by  such  particular Security;  and,  for  the purposes  of  this
     definition, any Security  authenticated and delivered under Section  3.6 in
     exchange for or in lieu of a mutilated, destroyed, lost or stolen  Security
     shall be  deemed to  evidence the same  debt as  the mutilated,  destroyed,
     lost or stolen Security.

           "Record Date" means any Regular Record Date or Special Record Date.

           "Redemption  Date", when  used with  respect  to  any Security  to be
     redeemed, means the date  fixed for such redemption by or pursuant  to this
     Indenture.

           "Redemption Price",  when used  with respect  to any  Security to  be
     redeemed, means  the price at which it  is to be redeemed  pursuant to this
     Indenture.

           "Reference Date" has the meaning specified in Section 12.4(4).

           "Registration Rights Agreement" has the meaning specified in  Section
     10.12.

           "Regular  Record  Date"  for  interest  payable  in  respect  of  any
     Security on any  Interest Payment  Date means the  April 15  or October  15
     (whether or not a Business  Day), as the case  may be, next preceding  such
     Interest Payment Date.

           "Regulation  S"   means  Regulation  S   under  the  Securities   Act
     (including any  successor regulation  thereto), as  it may  be deemed  from
     time to time.

           "Regulation  S  Global   Security"  has  the  meaning  specified   in
     Section 2.1.

           "Repurchase Date" has the meaning specified in Section 14.1.

           "Repurchase Price" has the meaning specified in Section 14.1.

           "Responsible Officer", when  used with respect to the Trustee,  means
     any officer  within the  Corporate Trust  Office of  the Trustee  including
     without limitation any vice president, assistant  vice president, assistant
     treasurer,  assistant   secretary,  corporate   trust  officer,   assistant
     corporate trust  officer  or  other employee  of  the  Trustee  customarily

                                        - 7 -
<PAGE>






     performing  functions  similar to  those  performed  by  any  of the  above
     designated officers and  also means, with respect to a particular corporate
     trust matter, any other  officer to whom such matter is referred because of
     his knowledge and familiarity with the particular subject.

           "Restricted   Global   Security"  has   the   meaning   specified  in
     Section 2.1.

           "Restricted Period" has the meaning specified in Section 2.1.

           "Restricted Security" has the meaning specified in Section 2.4.

           "Rule  144" means Rule  144 under  the Securities  Act (including any
     successor rule thereto), as it may be amended from time to time.

           "Rule 144A" means Rule 144A under  the Securities Act (including  any
     successor rule thereto), as it may be amended from time to time.

           "Rule 144A Information" has the meaning specified in Section 10.10.

           "Securities" has  the meaning ascribed to  it in  the first paragraph
     under the caption "Recitals of the Company".

           "Securities Act" means the United States  Securities Act of 1933,  as
     amended from time to time.

           "Security" means any Security (including any Global Security)  issued
     in substantially the  form set forth in  Section 2.2 and registered  in the
     Security Register.

           "Security  Register" and  "Security  Registrar" have  the  respective
     meanings specified in Section 3.5.

           "Senior Indebtedness" has the meaning specified in Section 13.1.

           "Shelf  Registration   Statement"  has  the   meaning  specified   in
     Section 10.12.

           "Significant  Subsidiary"  means  any  Subsidiary  that  would  be  a
     significant  subsidiary  as  defined under  the  Regulation  S-X under  the
     Securities Act and Exchange Act.

           "Special Interest" has the meaning specified in Section 2.2.

           "Special  Record  Date"  for the  payment of  any  Defaulted Interest
     means a date fixed by the Company pursuant to Section 3.7.

           "Stated  Maturity" when  used with  respect  to  any Security  or any
     installment of interest  thereon, means the date specified in such Security
     as  the  fixed date  on  which  the  principal  of such  Security  or  such
     installment of interest is due and payable.


                                        - 8 -
<PAGE>






           "Subsidiary" means  a corporation  more than  50% of  the outstanding
     Voting Stock of which  is owned, directly or indirectly, by the  Company or
     by one or more other Subsidiaries, or by the  Company and one or more other
     Subsidiaries.

           "Tax  Affected Security" means  any Security  that, on  or before the
     30th  day after  the  date  on which  the  Company  publishes a  notice  of
     redemption  pursuant to the third paragraph of  the reverse of the Security
     in Section 2.2 hereof,  is delivered to the Trustee together with a written
     statement from or on  behalf of  the beneficial owner  of such Security  to
     the  effect that  such  beneficial owner  has or  will  become entitled  to
     receive Additional Amounts as a result of such Tax Law Change.

           "Tax  Law Change"  means any  change in,  or amendment  to,  the laws
     (including  any  regulations  or rulings  promulgated  thereunder)  of  the
     United States  or Canada or  any political subdivision  or taxing authority
     thereof or therein  affecting taxation, or any change  in, or amendment to,
     the application  or official  interpretation of  such laws,  regulations or
     rulings.

           "Taxes" has the meaning specified in Section 2.2.

           "Trading Days" of  a class of Common Stock means (i) if such class of
     Common Stock is listed on  any United States national  securities exchange,
     days  on which  such  national securities  exchange  is open  for business;
     (ii) if such  class of  Common Stock  is quoted  on a  system of  automated
     dissemination of quotations  of securities prices, days on which trades may
     be effected through such system; or (iii) if such class of  Common Stock is
     not listed  for trading on  any United States  national securities exchange
     or quoted  on  any  system  of  automated  dissemination  of  quotation  of
     securities  prices, days  on which  such class  of Common  Stock is  traded
     regular way in the over-the-counter market and for  which a closing bid and
     a closing asked price for such class of Common Stock are available.

           "Transfer  Agent" has  the meaning  specified  in  Section 2.2.   The
     Company has initially appointed  the Trustee as its  Transfer Agent in  the
     Borough of  Manhattan, The City  of New York  and Midland  Bank plc as  its
     Transfer Agent in London, England.

           "Trust Indenture Act"   means the Trust  Indenture Act of 1939 as  in
     force at  the date  as of  which this  instrument  was executed;  provided,
     however, that  in the  event the  Trust Indenture  Act of  1939 is  amended
     after  such date,  "Trust Indenture Act"  means, to the  extent required by
     any such amendment, the Trust Indenture Act of 1939 as so amended.

           "Trustee" means  the  Person named  as  the  "Trustee" in  the  first
     paragraph of  this instrument until  a successor Trustee  shall have become
     such  pursuant  to  the  applicable  provisions   of  this  Indenture,  and
     thereafter "Trustee" shall mean such successor Trustee.

           "United States" means  the United  States of  America (including  the
     States and the  District of Columbia), its territories, its possessions and

                                        - 9 -
<PAGE>






     other  areas  subject  to its  jurisdiction  (its  "possessions"  including
     Puerto Rico, the  U.S. Virgin Islands,  Guam, American  Samoa, Wake  Island
     and the Northern Mariana Islands).

           "U.S. Additional Amounts" has the meaning specified in Section 2.2.

           "U.S. Excluded Holder" has the meaning in Section 2.2.

           "U.S. Taxes" has the meaning specified in Section 2.2.

           "United States person" has the meaning specified in Section 2.2.

           "Unrestricted  Global Security" means  a Global Security which is not
     a Restricted Security.

           "Vice President",  when used with respect  to the  Company, means any
     vice president, whether  or not designated by  a number or a word  or words
     added before or after the title "vice president".

           "Voting Power" of any  Person means the aggregate number of votes  of
     all  classes of  Capital Stock of  such Person which  ordinarily has voting
     power for the  election of the Board  of Directors or their  equivalents of
     such Person.

           "Voting  Stock"  means  stock  or  other  similar  interests  in  the
     corporation which ordinarily has  or have voting power for the  election of
     directors, or  persons performing  similar functions, whether  at all times
     or only so long as no senior class of stock or  other interests has or have
     such voting power by reason of any contingency.

           "Western Europe"  means Austria, Belgium,  Denmark, France,  Germany,
     Ireland,  Italy,  Luxembourg,  the  Netherlands,  Norway,  Portugal, Spain,
     Sweden, Switzerland and the United Kingdom.

     SECTION 1.2.  Compliance Certificates and Opinions.
                   ------------------------------------

           Upon any application or request by the Company to the Trustee or  the
     Paying Agent  in London  to take  any action  under any  provision of  this
     Indenture  or  as  required by  indenture  legislation,  the Company  shall
     furnish to  the Trustee or the Paying Agent in London,  as the case may be,
     an Officers'  Certificate stating that  all conditions  precedent, if  any,
     provided for in  this Indenture relating to  the proposed action have  been
     complied with  and an  Opinion of Counsel  stating that  in the opinion  of
     such counsel  all such  conditions precedent,  if any,  have been  complied
     with,  except that  in the case  of any  such application or  request as to
     which the  furnishing of  such documents  is specifically  required by  any
     provision  of this  Indenture relating  to such  particular application  or
     request,  no  additional  certificate or  opinion  need  be furnished,  and
     except in connection with the initial authentication of the Securities.



                                        - 10 -
<PAGE>






           Every certificate  or  opinion  with  respect to  compliance  with  a
     condition  or   covenant  provided   for  in   this  Indenture   (including
     certificates provided for in Section 10.9) shall include:

                  (1) a statement that  each individual signing such certificate
           or opinion  has read such covenant  or condition  and the definitions
           herein relating thereto;

                  (2)  a brief  statement  as to  the  nature and  scope  of the
           examination or  investigation upon which  the statements or  opinions
           contained in such certificate or opinion are based;

                  (3)  a statement that,  in the opinion of  such individual, he
           has made such examination or investigation  as is necessary to enable
           him  to  express an  informed  opinion  as to  whether  or  not  such
           covenant or condition has been complied with; and

                  (4) a  statement as to  whether, in the  opinion of  each such
           individual, such condition or covenant has been complied with.

     SECTION 1.3.  Form of Documents Delivered to the Trustee.
                   ------------------------------------------

           In any case  where several matters are  required to be  certified by,
     or  covered by an  opinion of,  any specified  Person, it is  not necessary
     that all such  matters be certified by, or covered  by the opinion of, only
     one such  Person, or  that they  be so  certified or  covered  by only  one
     document, but one  such Person may certify or  give an opinion with respect
     to some matters  and one or  more other such  Persons as to other  matters,
     and any such Person  may certify or give an  opinion as to such  matters in
     one or several documents.

           Any certificate  or  opinion  of an  officer of  the  Company may  be
     based, insofar  as  it relates  to  legal matters,  upon a  certificate  or
     opinion of, or representations by,  counsel, unless such officer  knows, or
     in the exercise  of reasonable care  should know, that  the certificate  or
     opinion or  representations with  respect to  the matters  upon which  such
     certificate or  opinion is  based are erroneous.   Any such  certificate or
     opinion of counsel may  be based, insofar as it relates to factual matters,
     upon  a certificate or  opinion of,  or representations  by, an  officer or
     officers  of the Company stating that the  information with respect to such
     factual matters  is in the possession  of the Company, unless  such counsel
     knows,  or  in  the exercise  of  reasonable  care  should know,  that  the
     certificate or opinion  or representations with respect to such matters are
     erroneous.

           Where any  Person is required to  make, give or  execute two or  more
     applications, requests,  consents,  certificates, statements,  opinions  or
     other instruments  under  this  Indenture,  they  may,  but  need  not,  be
     consolidated and form one instrument.



                                        - 11 -
<PAGE>






     SECTION 1.4.  Acts of Holders of Securities.
                   -----------------------------

           (a) Any request, demand,  authorization, direction, notice,  consent,
     waiver or other action provided or permitted by  this Indenture to be given
     or taken by Holders of Securities may  be embodied in and evidenced by  (1)
     one  or more  instruments  of substantially  similar  tenor signed  by such
     Holders in person  or by an  agent or  proxy duly appointed  in writing  by
     such  Holders or (2)  the record of Holders  of Securities  voting in favor
     thereof, either in  person or by proxies duly  appointed in writing, at any
     meeting of  Holders of Securities  duly called and held  in accordance with
     the provisions of  Article Nine. Such  action shall  become effective  when
     such instrument or instruments or record  is delivered to the Trustee  and,
     where it is hereby  expressly required, to the Company.  The  Trustee shall
     promptly deliver to the Company copies of  all such instruments and records
     delivered  to the Trustee.  Such  instrument or instruments and record (and
     the action  embodied therein  and evidenced  thereby) are herein  sometimes
     referred  to  as the  "Act"  of  the  Holders  of Securities  signing  such
     instrument  or  instruments  and  so voting  at  such  meeting.    Proof of
     execution of any such instrument or of a  writing appointing any such agent
     or  proxy,  or  of the  holding  by  any  Person of  a  Security,  shall be
     sufficient for  any purpose of this Indenture  and (subject to Section 6.1)
     conclusive in  favor of the Trustee  and the Company if  made in the manner
     provided  in this  Section.    The record  of  any  meeting of  Holders  of
     Securities shall be proved in the manner provided in Section 9.6.

           (b) The  fact and date  of the execution  by any  Person of  any such
     instrument or writing may be proved  by the affidavit of a witness of  such
     execution  or  by  a  certificate  of  a  notary  public  or  other officer
     authorized by  law to take  acknowledgements of deeds,  certifying that the
     individual  signing  such instrument  or  writing acknowledged  to  him the
     execution  thereof.    Where  such execution  is by  a  signer acting  in a
     capacity other  than his individual capacity, such certificate or affidavit
     shall also constitute sufficient proof of his authority.

           (c)  The principal amount and  serial number of any  Security held by
     any Person, and the  date of his holding the  same, shall be proved  by the
     Security Register.

           (d) The  Paying Agent in London  may in any  instance require further
     proof with respect to any of the matters referred to in this Section 1.4.

           (e) The fact and  date of execution of any such instrument or writing
     and the authority  of the Person executing  the same may also  be proved in
     any other manner  which the  Trustee or the  Paying Agent  in London  deems
     sufficient; and  the Trustee  or  the Paying  Agent in  London may  in  any
     instance require further proof with  respect to any of the matters referred
     to in this Section 1.4.

           (f) Any request,  demand, authorization, direction, notice,  consent,
     election, waiver or  other Act  of the Holder  of any  Security shall  bind
     every future Holder  of the same Security and  the Holder of every Security

                                        - 12 -
<PAGE>






     issued upon  the registration of  transfer thereof or  in exchange therefor
     or in lieu thereof in respect  of anything done, omitted or suffered to  be
     done by the  Trustee or  the Company in  reliance thereon,  whether or  not
     notation of such action is made upon such Security.

           (g) The provisions of  this Section 1.4 are subject to the provisions
     of Section 9.5.

     SECTION 1.5.  Notices, Etc., to Trustee and Company.
                   -------------------------------------

           Any  request,  demand,  authorization,  direction,  notice,  consent,
     election, waiver  or  Act  of  Holders  of  Securities  or  other  document
     provided  or  permitted by  this  Indenture  to  be  made  upon,  given  or
     furnished to, or filed with,

                  (1) the  Trustee or the Paying  Agent in London by  any Holder
           of  Securities  or by  the  Company  shall  be  sufficient for  every
           purpose hereunder  if made, given, furnished  or filed  in writing to
           or  with the  Trustee and  received  at  its Corporate  Trust Office,
           Attention: Corporate  Trust Services North American Vaccine, Inc., or
           to or with the  Paying Agent in London  and received at Mariner House
           Pepys   Street,  London   EC3N   4DA,  England,   Attention:  Midland
           Securities Services, or

                  (2) the Company by the  Trustee or by any Holder of Securities
           shall be  sufficient for  every purpose  hereunder (unless  otherwise
           herein  expressly   provided)  if  in  writing,  mailed,  first-class
           postage prepaid,  or telecopied  and confirmed  by mail,  first-class
           postage  prepaid,  or   delivered  by  hand  or  overnight   courier,
           addressed  to the  Company at  12103 Indian Creek  Court, Beltsville,
           Maryland, 20705,  Attention:  Daniel J.  Abdun-Nabi, or  at any other
           address  previously  furnished  in  writing  to  the  Trustee  by the
           Company.

           Any  request,  demand,  authorization,  direction,  notice,  consent,
     election or waiver required  or permitted under this Indenture shall  be in
     the  English  language,  except that  any  published  notice may  be  in an
     official language of the country of publication.

     SECTION 1.6.  Notice to Holders of Securities; Waiver.
                   ---------------------------------------

           Except as otherwise  expressly provided herein, where this  Indenture
     provides for notice  to Holders  of Securities  of any  event, such  notice
     shall be  sufficiently given to  Holders of  Securities if  in writing  and
     mailed, first-class postage  prepaid, to each Holder of a Security affected
     by such event, at the address of  such Holder as it appears in the Security
     Register, not earlier than the earliest date and not later than the  latest
     date  prescribed for  the giving  of such  notice.   Such  notice shall  be
     deemed to have been given when such notice is mailed.


                                        - 13 -
<PAGE>






           Neither the  failure to  mail  such  notice, nor  any defect  in  any
     notice so mailed, to  any particular Holder of a Security shall  affect the
     sufficiency of such  notice with respect  to other  Holders of  Securities.
     In case by  reason of the suspension  of regular mail service or  by reason
     of any  other cause it shall be impracticable  to give such notice by mail,
     then such notification to Holders of Securities  as shall be made with  the
     approval  of  the  Trustee,   which  approval  shall  not  be  unreasonably
     withheld, shall  constitute a sufficient  notification to such Holders  for
     every purpose hereunder.

           Where this Indenture provides for notice  in any manner, such  notice
     may  be waived in  writing by the Person  entitled to  receive such notice,
     either before or  after the event, and such  waiver shall be the equivalent
     of such notice.  Waivers of  notice by Holders of Securities shall be filed
     with  the Trustee, but  such filing shall not  be a  condition precedent to
     the validity of any action taken in reliance upon such waiver.

     SECTION 1.7.  Effect of Headings and Table of Contents.
                   ----------------------------------------

           The  Article and Section  headings herein  and the  Table of Contents
     are for convenience only and shall not affect the construction hereof.

     SECTION 1.8.  Successors and Assigns.
                   ----------------------

           All covenants and agreements in this  Indenture by the Company  shall
     bind its successors and assigns, whether so expressed or not.

     SECTION 1.9. Separability Clause.
                  -------------------

           In case any  provision in this  Indenture or the Securities  shall be
     invalid,   illegal   or   unenforceable,   the   validity,   legality   and
     enforceability of  the  remaining  provisions  shall  not  in  any  way  be
     affected or impaired thereby.

     SECTION 1.10.  Benefits of Indenture.
                    ---------------------

           Except as  provided in the next  sentence, nothing  in this Indenture
     or in the Securities, express or implied,  shall give to any Person,  other
     than the parties hereto and their successors and  assigns hereunder and the
     Holders of  Securities, any benefit or legal  or equitable right, remedy or
     claim  under  this Indenture.    The  provisions  of  Article Thirteen  are
     intended to be  for the benefit of,  and shall be enforceable  directly by,
     the holders of Senior Indebtedness.






                                        - 14 -
<PAGE>






     SECTION 1.11.  Governing Law.
                    -------------

           THIS INDENTURE AND THE SECURITIES SHALL  BE GOVERNED BY AND CONSTRUED
     IN ACCORDANCE WITH  THE LAWS OF THE STATE OF NEW YORK, THE UNITED STATES OF
     AMERICA, WITHOUT REGARD TO THE PRINCIPLES OF CONFLICTS OF LAWS.

     SECTION 1.12.  Legal Holidays.
                    --------------

           In any  case  where  any  Interest  Payment  Date,  Redemption  Date,
     Repurchase Date  or Stated  Maturity of  any Security  or the  last day  on
     which a Holder of a Security has  a right to convert his Security shall not
     be a  Business Day  at a Place  of Payment or  Place of Conversion,  as the
     case may  be, then (notwithstanding  any other provision  of this Indenture
     or of  the Securities)  payment of  interest or  principal and premium,  if
     any, or delivery for  conversion of such Security need not be  made at such
     Place of Payment or Place of  Conversion, as the case may be, on or by such
     day, but  may be made  on or by  the next  succeeding Business Day  at such
     Place of Payment or Place of Conversion,  as the case may be, with the same
     force and effect as if made on  the Interest Payment Date, Redemption  Date
     or Repurchase  Date, or  at the  Stated Maturity or  by such  last day  for
     conversion; provided,  however, that in  the case  that payment is  made on
     such  succeeding Business Day,  no interest shall  accrue on  the amount so
     payable  for  the  period  from  and  after  such  Interest  Payment  Date,
     Redemption  Date,  Repurchase  Date,  Stated  Maturity   or  last  day  for
     conversion, as the case may be.

     SECTION 1.13.  Consent to Jurisdiction and Service of Process.
                    ----------------------------------------------

           The Company agrees that any legal  suit, action or proceeding brought
     by any party to enforce any rights under or with  respect to this Indenture
     or the Securities may be  instituted in any state  or federal court in  the
     City of  New York,  State of  New York, and  waives to  the fullest  extent
     permitted by  law any objection which  it may now or  hereafter have to the
     laying of  venue of  any such  suit, action or  proceeding and  irrevocably
     submits to  the non-exclusive  jurisdiction of any  such court in  any such
     suit, action or  proceeding. The Company hereby irrevocably  designates and
     appoints CT Corporation  System ("CT") as the Company's authorized agent to
     receive and forward on its behalf service of any and all  process which may
     be  served in any  such suit, action  or proceeding  in any such  court and
     agrees that service of process upon CT (or any  successor) at its office at
     1633 Broadway,  New York,  New York  10019 (or  such other  address in  the
     Borough of Manhattan,  the City of New  York, as the Company  may designate
     by written notice to  the Trustee)  and written notice  of said service  to
     the Company  mailed  or  delivered  to  The  CT  Corporation  System,  1633
     Broadway,  New York,  New  York  10019 shall  be  deemed in  every  respect
     effective service of  process upon the Company in  any such suit, action or
     proceeding and shall  be taken and held  to be valid personal  service upon
     the  Company.   Said  designation  and  appointment  shall be  irrevocable.
     Nothing  in this Section 1.13 shall affect the right of any party hereto or

                                        - 15 -
<PAGE>






     any Holder to  serve process in  any manner permitted  by law or  limit the
     right of any party  hereto to bring proceedings against the Company  in the
     courts of  any jurisdiction or  jurisdictions.  The  Company further agrees
     to take any and  all action, including the execution and filing  of any and
     all  such documents and  instruments, as may be  necessary to continue such
     designation and appointment of CT  in full force and effect so long as this
     Indenture or any of  the Securities  shall be outstanding.   To the  extent
     that  the  Company  has  or   hereafter  may  acquire  any   immunity  from
     jurisdiction of  any  court or  from  any  legal process  (whether  through
     service  of notice,  attachment  prior to  judgment,  attachment in  aid of
     execution, execution or  otherwise) with respect to itself or its property,
     the  Company hereby  irrevocably  waives such  immunity  in respect  of its
     obligations  under  this  Indenture  and  the  Securities,  to  the  extent
     permitted by law.

     SECTION 1.14.  Conversion of Currency.
                    ----------------------

           (a)  The Company covenants  and agrees  that the following provisions
     shall apply  to conversion of  currency in the  case of the Securities  and
     this Indenture:

                  (i)  If for the purpose of obtaining judgment in, or enforcing
           the judgment of,  any court in any  country, it becomes  necessary to
           convert  into any other currency (the "judgment  currency") an amount
           due in United  States dollars, then the  conversion shall be made  at
           the rate  of exchange prevailing on  the Business Day before the date
           on which the judgment  is given or the  order of enforcement is made,
           as the case may be (unless a court shall otherwise determine).

                  (ii) If there  is a change in the  rate of exchange prevailing
           between  the Business  Day before  the day on  which the  judgment is
           given  or an  order of enforcement  is made, as  the case may  be (or
           such other date as  a court shall determine), and the date of receipt
           of  the amount due,  to the extent  permitted by  applicable law, the
           Company will pay  additional (or, as  the case may  be, such  lesser)
           amount, if any,  as may be necessary so  that the amount  paid in the
           judgment currency when converted at the  rate of exchange  prevailing
           on the  date of  receipt  will produce  the amount  in United  States
           dollars originally due.

           (b) In the event of the winding-up  of the Company at any  time while
     any  amount or  damages owing under  the Securities and  this Indenture, or
     any  judgment   or  order  rendered   in  respect  thereof,  shall   remain
     outstanding,  the Company  shall  indemnify and  hold  the Holders  and the
     Trustee  harmless  against any  deficiency  arising or  resulting  from any
     variation  in rates  of  exchange between  (1)  the date  as  of which  the
     equivalent of the amount  in United States dollars due or  contingently due
     under the Securities and this  Indenture (other than under  this subsection
     (b)) is calculated  for the purposes of  such winding-up and (2)  the final
     date  for the  filing of  proofs  of claim  in such  winding-up.   For  the
     purposes of this  subsection (b), the final  date for the filing  of proofs

                                        - 16 -
<PAGE>






     of claim in the  winding up of the Company shall  be the date fixed by  the
     liquidator  or otherwise  in  accordance with  the  relevant provisions  of
     applicable  law  as  being  the   latest  practicable  date  as   at  which
     liabilities of the Company may be ascertained  for such winding-up prior to
     payment by the liquidator or otherwise in respect thereto.

           (c) The obligations contained in subsections  (a)(ii) and (b) of this
     Section 1.14 shall  constitute separate and independent obligations  of the
     Company   from  its  other  obligations   under  the  Securities  and  this
     Indenture, shall give  rise to separate  and independent  causes of  action
     against the  Company, shall apply  irrespective of any  waiver or extension
     granted by  any Holder or the Trustee  or either of them  from time to time
     and shall  continue in full  force and effect  notwithstanding any judgment
     or order  or the  filing of  any proof of  claim in  the winding-up  of the
     Company for  a liquidated sum  in respect of  amounts due hereunder  (other
     than under subsection  (b) above) or under any such judgment or order.  Any
     such deficiency as aforesaid shall be deemed to constitute a loss  suffered
     by  the  Holders or  the  Trustee, as  the  case may  be, and  no  proof or
     evidence  of  any actual  loss  shall be  required  by the  Company  or the
     liquidator  or otherwise  or any of  them.   In the case  of subsection (b)
     above, the amount of  such deficiency shall not be deemed  to be reduced by
     any variation  in rates of  exchange occurring between the  said final date
     and the date of any liquidating distribution.

           (d) The term  "rate(s) of exchange"  shall mean the  rate, quoted  at
     noon for transactions in excess of U.S. $1,000,000,  at which the Holder or
     the Trustee,  as the case may  be, is able or  would have been  able on the
     relevant date  to  purchase at  United  States  dollars with  the  judgment
     currency other  than United States  dollars referred to  in subsections (a)
     and (b) above and includes any premiums and costs of exchange payable.

     SECTION 1.15.  Currency Equivalent.
                    -------------------

                  Except  as  provided in  Section  1.14,  for  purposes of  the
     construction of the  terms of this Indenture  or of the Securities,  in the
     event that any amount is stated  herein in the currency of one  nation (the
     "First Currency"),  as of  any date  such amount  shall also  be deemed  to
     represent the  amount in  the currency  of any  other relevant  nation (the
     "Other  Currency") which is required  to purchase such  amount in the First
     Currency at  the spot buying  rate for the  purchase of the First  Currency
     with  the Other  Currency used  by The  Toronto-Dominion Bank  at its  main
     branch  in Toronto  as of  approximately 12:00  noon (Toronto time)  on the
     date of determination.

     SECTION 1.16.  Interest Act (Canada).
                    ---------------------

           For purposes  of the Interest Act  (Canada), where  in this Indenture
     and  the Securities, a rate of interest is to be calculated on the basis of
     a  year of 360 days, the yearly rate of  interest to which the 360 day rate


                                        - 17 -
<PAGE>






     is equivalent is  such rate multiplied  by the number  of days in  the year
     for which such calculation is made and divided by 360.

     SECTION 1.17.  Conflict with Trust Indenture Act.
                    ---------------------------------

           If  any provision  hereof  limits,  qualifies  or  conflicts  with  a
     provision of  the Trust Indenture Act that is required under such Act to be
     a part  of and govern this  Indenture, the latter provision  shall control.
     If any provision  of this Indenture modifies  or excludes any provision  of
     the Trust  Indenture Act that  may be so  modified or excluded, the  latter
     provision shall be deemed  to apply to this Indenture as so  modified or to
     be excluded,  as the case may be.  Until such  time as this Indenture shall
     be qualified under  the Trust Indenture  Act, this  Indenture, the  Company
     and  the Trustee shall be  deemed for all purposes  hereof to be subject to
     and governed by the Trust  Indenture Act to the same extent as would be the
     case if this Indenture were so qualified on the date hereof. 


                                     ARTICLE TWO

                                    SECURITY FORMS

     SECTION 2.1.  Forms Generally.
                    --------------

           The Securities  shall be in substantially the forms set forth in this
     Article, with  such  appropriate insertions,  omissions, substitutions  and
     other  variations as are required  or permitted by  this Indenture, and may
     have such  letters,  numbers or  other  marks  of identification  and  such
     legends or  endorsements placed thereon as  may be required to  comply with
     the rules of any securities exchange, or as  may, consistently herewith, be
     determined by  the  officers executing  such  Securities, as  evidenced  by
     their execution thereof.

           The   Trustee's   certificates  of   authentication   shall   be   in
     substantially the form set forth in Section 2.5.

           Conversion notices  shall be in substantially  the form  set forth in
     the Annexes to the Indenture.

           Securities  that are  Restricted  Securities shall  bear  the  legend
     required by Section 2.4.

           The Securities shall  be issued in  the form  of one  or more  Global
     Securities and  Definitive Securities  in certificated  form in  accordance
     with Section  3.4.    The  Depositary  for  such  Global  Securities  shall
     initially be The Depository Trust Company ("DTC").

           A  Global  Security   may  be  printed,  lithographed,   typewritten,
     mimeographed or  otherwise produced, as  determined by the  officers of the
     Company  executing such Security, as evidenced  by their execution thereof.

                                        - 18 -
<PAGE>






     The  Definitive Securities  shall  be printed,  lithographed,  typewritten,
     mimeographed, or  engraved  or  otherwise  produced  in  any  other  manner
     permitted by  the rules of any securities exchange  on which the Securities
     may  be  listed,  all  as   determined  by  the  officers   executing  such
     Securities, as  evidenced  by their  execution  thereof.   The  format  and
     spacing  of the  text  of  a Security  may  be  varied to  facilitate  such
     production. 

           Securities  offered  and  sold  in  their  initial  distribution   in
     reliance on  Regulation S shall be  initially issued in the  form of one or
     more Global Securities  in definitive, fully registered  form substantially
     in the form of  the Regulation S Global Security set forth  in Section 2.2,
     with such applicable legends as are provided for in Section 2.2, except  as
     otherwise permitted herein.   Such Global Securities shall be registered in
     the name  of a nominee  of DTC and  deposited with the Trustee,  at its New
     York office, as custodian for the Depositary, duly executed  by the Company
     and authenticated by  the Trustee as  hereinafter provided,  for credit  to
     the respective  accounts at the  Depositary of the  depositories for Morgan
     Guaranty Trust  Company of New  York, Brussels Office,  as operator  of the
     Euroclear System ("Euroclear"), and Cedel Bank,  societe anonyme ("CEDEL").
     Until such  time  as the  Restricted  Period  shall have  terminated,  such
     Global Securities  shall be referred to herein  as the "Regulation S Global
     Security." After such  time as the Restricted Period shall have terminated,
     such  Global Security  shall  be referred  to  herein as  the "Unrestricted
     Global Security."  The  aggregate  principal amount  of  the  Regulation  S
     Global Security or the  Unrestricted Global Security may from time  to time
     be  increased  or  decreased by  adjustments  made  on the  records  of the
     Trustee,   as  custodian  for   the  Depositary,   in  connection   with  a
     corresponding  decrease or  increase in the  aggregate principal  amount of
     the Restricted Global Security, as  hereinafter provided.  As  used herein,
     the term  "Restricted  Period" means  the  period  of 40  consecutive  days
     beginning on  and including the  first day after  the later of  (i) the day
     that Goldman, Sachs & Co.,  advises the Company and the Trustee of  the day
     on  which  the  Securities  are   first  offered  to  persons   other  than
     distributors (as defined in Regulation S)  in reliance on Regulation S  and
     (ii)  the latest date of original issue  of any Security.  The Regulation S
     Global  Security, the Unrestricted Global Security and all other Securities
     that  are  not  Restricted Securities  shall  collectively  he  referred to
     herein as the "Unrestricted Securities."

           Securities  offered  and  sold  in  their  initial  distribution   in
     reliance  on Rule 144A  shall be issued in  the form of one  or more Global
     Securities (collectively, the "Restricted Global  Security") in definitive,
     fully registered  form substantially in  the form of  the Restricted Global
     Security set forth  in Section  2.2, with  such applicable  legends as  are
     provided for  in Section 2.2, except  as otherwise permitted  herein.  Such
     Restricted  Global  Security  shall  be  registered  in  the  name  of  the
     Depositary or its nominee and deposited with  the Trustee, at its New  York
     office,  as custodian for the Depositary,  duly executed by the Company and
     authenticated by  the  Trustee  as  hereinafter provided.    The  aggregate
     principal  amount of the Restricted  Global Security may  from time to time
     be  increased  or decreased  by  adjustments made  on  the  records of  the

                                        - 19 -
<PAGE>






     Trustee,  as   custodian  for   the   Depositary  in   connection  with   a
     corresponding  decrease or  increase in the  aggregate principal  amount of
     the Regulation S  Global Security or  the Unrestricted  Global Security  as
     hereinafter provided. 

           Securities  offered  and  sold  in  their  initial  distribution   in
     reliance  on transaction exempt from registration  under the Securities Act
     to an  institutional investor that  is an "accredited  investor" within the
     meaning  of Rule  501(a)(1),  (2),  (3) or  (7)  under the  Securities  Act
     ("Institutional Accredited Investor") shall be issued  in definitive, fully
     registered form each  a "Definitive Restricted Security",  substantially in
     the form  of the Definitive  Restricted Security  set forth in  Section 2.2
     with such applicable legends as are provided for in Section 2.2, except  as
     otherwise permitted herein.

     SECTION 2.2.  Forms of Securities.
                   -------------------

     Forms of Securities:

                                    [FORM OF FACE]

     THE FOLLOWING LEGEND (THE  "RULE 144A LEGEND") SHALL APPEAR ON THE  FACE OF
     EACH  DEFINITIVE RESTRICTED  SECURITY OR  OTHER  RESTRICTED SECURITY  OTHER
     THAN ANY GLOBAL SECURITY:

           THIS  SECURITY  (OR  ITS  PREDECESSOR)  WAS ORIGINALLY  ISSUED  IN  A
     TRANSACTION EXEMPT  FROM REGISTRATION  UNDER THE  UNITED STATES  SECURITIES
     ACT OF 1933, AS  AMENDED (THE "SECURITIES ACT"), AND THIS SECURITY  AND ANY
     COMMON SHARES  ISSUABLE UPON ITS  CONVERSION MAY NOT  BE SOLD  OR OTHERWISE
     TRANSFERRED IN THE  ABSENCE OF SUCH REGISTRATION OR AN APPLICABLE EXEMPTION
     THEREFROM.    THIS  SECURITY  MAY  ONLY BE  SOLD  IN  ACCORDANCE  WITH  THE
     INDENTURE, COPIES  OF WHICH ARE  AVAILABLE FOR INSPECTION  AT THE CORPORATE
     TRUST OFFICE OF THE  TRUSTEE.   EACH PURCHASER OF  THIS SECURITY IS  HEREBY
     NOTIFIED THAT THE SELLER  OF THIS SECURITY MAY BE RELYING ON  THE EXEMPTION
     FROM  THE PROVISIONS OF  SECTION 5 OF THE  SECURITIES ACT  PROVIDED BY RULE
     144A THEREUNDER.

           THE HOLDER OF THIS  SECURITY AGREES FOR THE BENEFIT OF NORTH AMERICAN
     VACCINE, INC.  (THE "COMPANY") THAT (A) THIS SECURITY AND ANY COMMON SHARES
     ISSUABLE  UPON   ITS  CONVERSION  MAY  BE   RESOLD,  PLEDGED  OR  OTHERWISE
     TRANSFERRED ONLY (I)  TO A PERSON WHO  THE SELLER REASONABLY BELIEVES  IS A
     QUALIFIED   INSTITUTIONAL  BUYER  (AS  DEFINED  IN   RULE  144A  UNDER  THE
     SECURITIES ACT) IN  A TRANSACTION MEETING  THE REQUIREMENTS  OF RULE  144A,
     (II) IN AN OFFSHORE  TRANSACTION COMPLYING WITH THE PROVISIONS  OF RULE 904
     OF  REGULATION S  UNDER  THE  SECURITIES ACT,  (III)  IN  THE CASE  OF  ANY
     PURCHASER OTHER THAN A PURCHASER  WHO HAS OTHERWISE AGREED WITH THE COMPANY
     TO AN  INSTITUTION THAT IS AN  "ACCREDITED INVESTOR" WITHIN THE  MEANING OF
     RULE 501(a)  UNDER  THE SECURITIES  ACT IN  A TRANSACTION  EXEMPT FROM  THE
     REGISTRATION  REQUIREMENTS THEREOF,  (IV)  PURSUANT  TO AN  EXEMPTION  FROM
     REGISTRATION UNDER THE SECURITIES ACT  PROVIDED BY RULE 144  THEREUNDER (IF
     AVAILABLE), OR (V)  PURSUANT TO AN EFFECTIVE  REGISTRATION STATEMENT  UNDER

                                        - 20 -
<PAGE>






     THE SECURITIES  ACT,  IN  EACH  CASE  IN  ACCORDANCE  WITH  ANY  APPLICABLE
     SECURITIES  LAWS  OF THE  STATES  AND  OTHER  JURISDICTIONS  OF THE  UNITED
     STATES,  AND  THAT  (B) THE  HOLDER  WILL, AND  EACH  SUBSEQUENT  HOLDER IS
     REQUIRED TO,  NOTIFY ANY PURCHASER OF  THIS SECURITY OR SUCH  COMMON SHARES
     FROM IT OF THE RESALE RESTRICTIONS REFERRED TO IN CLAUSE (A) ABOVE.

           THIS SECURITY,  ANY COMMON SHARES  ISSUABLE UPON  ITS CONVERSION  AND
     ANY RELATED DOCUMENTATION MAY  BE AMENDED OR SUPPLEMENTED FROM TIME TO TIME
     TO MODIFY  THE  RESTRICTIONS  ON  AND  PROCEDURES  FOR  RESALES  AND  OTHER
     TRANSFERS OF THIS SECURITY  AND ANY  SUCH SHARES TO  REFLECT ANY CHANGE  IN
     APPLICABLE  LAW  OR  REGULATION  (OR  THE  INTERPRETATION  THEREOF)  OR  IN
     PRACTICES  RELATING TO  THE  RESALE OR  TRANSFER  OF RESTRICTED  SECURITIES
     GENERALLY.   THE HOLDER  OF  THIS SECURITY  AND ANY  SUCH SHARES  SHALL  BE
     DEEMED BY  THE ACCEPTANCE  OF THIS  SECURITY AND  ANY SUCH  SHARES TO  HAVE
     AGREED TO ANY SUCH AMENDMENT OR SUPPLEMENT.

     THE  FOLLOWING LEGEND SHALL  APPEAR ON  THE FACE OF  EACH RESTRICTED GLOBAL
     SECURITY:

           THE   SECURITIES  EVIDENCED   BY  THIS   GLOBAL  SECURITY   (OR   ITS
     PREDECESSOR)  WERE   ORIGINALLY  ISSUED  IN   A  TRANSACTION  EXEMPT   FROM
     REGISTRATION UNDER THE  UNITED STATES SECURITIES  ACT OF  1933, AS  AMENDED
     (THE "SECURITIES ACT"),  AND SUCH SECURITIES AND ANY COMMON SHARES ISSUABLE
     UPON THEIR CONVERSION MAY NOT  BE RESOLD, PLEDGED OR  OTHERWISE TRANSFERRED
     IN THE ABSENCE OF SUCH  REGISTRATION OR AN APPLICABLE  EXEMPTION THEREFROM.
     SUCH SECURITIES MAY ONLY  BE SOLD IN ACCORDANCE WITH THE  INDENTURE, COPIES
     OF WHICH ARE AVAILABLE  FOR INSPECTION AT THE CORPORATE TRUST OFFICE OF THE
     TRUSTEE.  EACH  PURCHASER OF ANY  BENEFICIAL INTEREST IN THE  SECURITIES IS
     HEREBY NOTIFIED  THAT  THE  SELLER  OF  SUCH  BENEFICIAL  INTEREST  IN  THE
     SECURITIES  MAY BE RELYING ON THE EXEMPTION  FROM THE PROVISIONS OF SECTION
     5 OF THE SECURITIES ACT PROVIDED BY RULE 144A THEREUNDER.

           EACH  BENEFICIAL  OWNER OF  AN  INTEREST  IN  ANY  OF THE  SECURITIES
     EVIDENCED  BY THIS  GLOBAL  SECURITY  (INCLUDING  ANY  PARTICIPANT  IN  THE
     DEPOSITARY  HOLDING THE GLOBAL  SECURITY THAT IS  SHOWN AS  HOLDING SUCH AN
     INTEREST ON  THE RECORDS OF SUCH DEPOSITARY AND  EACH BENEFICIAL OWNER THAT
     HOLDS  THROUGH  ANY SUCH  PARTICIPANT)  AGREES  FOR  THE  BENEFIT OF  NORTH
     AMERICAN VACCINE, INC.  (THE "COMPANY") THAT (A) ANY BENEFICIAL INTEREST IN
     THE SECURITIES OR  ANY COMMON SHARES ISSUABLE UPON  THEIR CONVERSION MAY BE
     RESOLD,  PLEDGED OR OTHERWISE  TRANSFERRED ONLY  (I)   TO A PERSON  WHO THE
     SELLER REASONABLY  BELIEVES IS A QUALIFIED  INSTITUTIONAL BUYER (AS DEFINED
     IN  RULE 144A  UNDER  THE  SECURITIES ACT)  IN  A TRANSACTION  MEETING  THE
     REQUIREMENTS OF RULE 144A, (II)  IN AN OFFSHORE TRANSACTION  COMPLYING WITH
     THE PROVISIONS OF RULE 904 OF REGULATION S  UNDER THE SECURITIES ACT, (III)
     IN THE CASE OF ANY BENEFICIAL OWNER  OTHER THAN A BENEFICIAL OWNER WHO  HAS
     OTHERWISE  AGREED  WITH  THE  COMPANY,   TO  AN  INSTITUTION  THAT   IS  AN
     "ACCREDITED INVESTOR"  WITHIN  THE  MEANING  OF  RULE  501  (A)  UNDER  THE
     SECURITIES ACT IN  A TRANSACTION EXEMPT FROM THE  REGISTRATION REQUIREMENTS
     THEREOF,  (IV)  PURSUANT  TO  AN  EXEMPTION  FROM  REGISTRATION  UNDER  THE
     SECURITIES  ACT PROVIDED  BY  RULE l44  THEREUNDER  (IF AVAILABLE),  OR (V)
     PURSUANT TO AN EFFECTIVE  REGISTRATION STATEMENT UNDER THE  SECURITIES ACT,
     IN EACH  CASE IN  ACCORDANCE WITH  ANY APPLICABLE  SECURITIES  LAWS OF  THE

                                        - 21 -
<PAGE>






     STATES  AND OTHER  JURISDICTIONS OF  THE  UNITED STATES,  AND THAT  (B) THE
     BENEFICIAL  OWNER  WILL,  AND  EACH  SUBSEQUENT  BENEFICIAL  OWNER  OF  THE
     SECURITIES OR ANY  COMMON SHARES ISSUABLE UPON THEIR CONVERSION IS REQUIRED
     TO, NOTIFY ANY PURCHASER  OF ANY BENEFICIAL INTEREST IN THE  SECURITIES AND
     SUCH COMMON  SHARES  FROM IT  OF THE  RESALE  RESTRICTIONS REFERRED  TO  IN
     CLAUSE (A) ABOVE.

           THIS SECURITY,  ANY COMMON  SHARES ISSUABLE UPON  ITS CONVERSION  AND
     ANY RELATED DOCUMENTATION MAY BE AMENDED OR  SUPPLEMENTED FROM TIME TO TIME
     TO MODIFY  THE  RESTRICTIONS  ON  AND  PROCEDURES  FOR  RESALES  AND  OTHER
     TRANSFERS OF  THIS SECURITY AND  ANY SUCH SHARES  TO REFLECT ANY CHANGE  IN
     APPLICABLE  LAW  OR  REGULATION  (OR  THE  INTERPRETATION  THEREOF)  OR  IN
     PRACTICES  RELATING  TO THE  RESALE  OR TRANSFER  OF  RESTRICTED SECURITIES
     GENERALLY.   THE HOLDER OF THIS SECURITY AND  ANY SUCH SHARES, REPRESENTING
     THE INTERESTS  HELD BY EACH BENEFICIAL  OWNER HEREOF AND THEREOF,  SHALL BE
     DEEMED BY  THE ACCEPTANCE  OF THIS  SECURITY AND  ANY SUCH  SHARES TO  HAVE
     AGREED TO ANY SUCH AMENDMENT OR SUPPLEMENT.

     THE FOLLOWING LEGEND SHALL APPEAR ON THE FACE OF EACH GLOBAL SECURITY:

           THIS  SECURITY  IS  A  GLOBAL  SECURITY  WITHIN  THE  MEANING  OF THE
     INDENTURE  HEREINAFTER REFERRED  TO AND  IS REGISTERED  IN THE  NAME OF THE
     DEPOSITARY OR  A NOMINEE  OF THE DEPOSITARY,  WHICH MAY  BE TREATED BY  THE
     COMPANY, THE TRUSTEE  AND ANY  AGENT THEREOF AS  OWNER AND  HOLDER OF  THIS
     SECURITY FOR ALL PURPOSES.

           UNLESS THIS  SECURITY IS PRESENTED BY AN AUTHORIZED REPRESENTATIVE OF
     THE DEPOSITORY  TRUST  COMPANY, A  NEW  YORK  CORPORATION ("DTC"),  TO  THE
     COMPANY OR ITS  AGENT FOR REGISTRATION  OF TRANSFER,  EXCHANGE OR  PAYMENT,
     AND  ANY CERTIFICATE ISSUED IN EXCHANGE FOR  THIS SECURITY IS REGISTERED IN
     THE  NAME  OF CEDE  & CO.  OR  IN SUCH  OTHER NAME  AS IS  REQUESTED  BY AN
     AUTHORIZED REPRESENTATIVE OF DTC (AND  ANY PAYMENT IS MADE TO CEDE & CO. OR
     TO SUCH OTHER  ENTITY AS  IS REQUESTED BY  AN AUTHORIZED REPRESENTATIVE  OF
     DTC), ANY TRANSFER,  PLEDGE OR OTHER USE  HEREOF FOR VALUE OR  OTHERWISE BY
     OR TO ANY PERSON IS WRONGFUL INASMUCH AS  THE REGISTERED OWNER HEREOF, CEDE
     & CO., HAS AN INTEREST HEREIN.

           UNLESS AND UNTIL IT  IS EXCHANGED IN WHOLE OR IN PART FOR  SECURITIES
     IN DEFINITIVE  FORM  IN  THE  LIMITED  CIRCUMSTANCES  REFERRED  TO  IN  THE
     INDENTURE,  THIS GLOBAL SECURITY MAY  NOT BE TRANSFERRED  EXCEPT AS A WHOLE
     BY THE DEPOSITARY TO  A NOMINEE OF THE  DEPOSITARY OR BY  A NOMINEE OF  THE
     DEPOSITARY TO  THE DEPOSITARY OR  ANOTHER NOMINEE OF  THE DEPOSITARY OR  BY
     THE DEPOSITARY OR  ANY SUCH NOMINEE TO A  SUCCESSOR DEPOSITARY OR A NOMINEE
     OF SUCH SUCCESSOR DEPOSITARY.

     THE FOLLOWING LEGEND  SHALL APPEAR ON THE FACE  OF EACH REGULATION S GLOBAL
     SECURITY AND UNRESTRICTED GLOBAL SECURITY:

     THE SECURITIES EVIDENCED  BY THIS GLOBAL SECURITY (OR ITS PREDECESSOR) WERE
     ORIGINALLY  ISSUED IN  A  TRANSACTION EXEMPT  FROM  REGISTRATION UNDER  THE
     UNITED STATES  SECURITIES ACT OF  1933, AS AMENDED  (THE "SECURITIES ACT"),
     AND MAY  NOT BE  OFFERED, SOLD,  PLEDGED OR  OTHERWISE  TRANSFERRED IN  THE

                                        - 22 -
<PAGE>






     UNITED STATES  OR TO,  OR FOR THE  ACCOUNT OR BENEFIT  OF, ANY  U.S. PERSON
     UNLESS SUCH SECURITIES  ARE REGISTERED UNDER THE SECURITIES ACT OR PURSUANT
     TO  AN  AVAILABLE  EXEMPTION FROM  THE  REGISTRATION  REQUIREMENTS  OF  THE
     SECURITIES ACT AND ALL APPLICABLE STATE SECURITIES  LAWS.  TERMS USED ABOVE
     HAVE THE MEANINGS GIVEN THEM IN REGULATIONS UNDER THE SECURITIES ACT.
















































                                        - 23 -
<PAGE>






                             NORTH AMERICAN VACCINE, INC.

                         6.50% CONVERTIBLE SUBORDINATED NOTE
                                   DUE MAY 1, 2003

     No.__________U.S.$__________
     [IF  A REGULATION  S  GLOBAL SECURITY  OR  AN UNRESTRICTED  GLOBAL SECURITY
     CUSIP No.   U65777AA9  ]
     [IF A RESTRICTED GLOBAL SECURITY-CUSIP NO.  657201AA7 ]
     [IF A DEFINITIVE RESTRICTED SECURITY-CUSIP NO. 657201AB5 ]
     [ISIN No.  US657201AA77 ]


           NORTH  AMERICAN  VACCINE, INC.,  a  corporation  duly  organized  and
     existing under the laws of Canada (herein  called the "Company", which term
     includes any  successor  Person under  the  Indenture  referred to  on  the
     reverse  hereof),   for  value   received,  hereby   promises  to  pay   to
     ____________________,   or  registered  assigns,   the  principal   sum  of
     ____________________  United States Dollars [(which amount may from time to
     time be increased  or decreased by adjustments  made on the records  of the
     Trustee, as custodian of the  Depositary, in accordance with the rules  and
     procedures of the Depositary; provided,  however, that such amount  may not
     exceed U.S.  $86,250,000 )]* on  May 1, 2003  and to pay interest  thereon,
     from May  7,  1996, or  from  the most  recent  Interest Payment  Date  (as
     defined  below) to  which  interest has  been  paid or  duly  provided for,
     semi-annually  in arrears on  May 1 and  November 1 in each  year (each, an
     "Interest  Payment Date"),  commencing  November 1,  1996,  at the  rate of
     6.50% per annum  (together with any Additional Amounts and Special Interest
     the Company  may be required  to pay), until  the principal hereof is  due,
     and at the  rate of 6.50% per  annum on any overdue principal  and premium,
     if any, and, to the extent permitted by law,  on any overdue interest.  The
     interest  so  payable, and  punctually paid  or duly  provided for,  on any
     Interest Payment Date  will, as provided in  the Indenture, be paid  to the
     Person  in whose name this Security (or one or more Predecessor Securities)
     is registered at the close of business  on the Regular Record Date for such
     interest,  which shall  be the  April 15  or October  15 (whether  or not a
     Business Day),  as the case  may be, next  preceding such Interest  Payment
     Date.   Except as  otherwise provided in  the Indenture, any  such interest
     not so punctually  paid or duly  provided for  ("Defaulted Interest")  will
     forthwith cease to be  payable to  the Holder on  such Regular Record  Date
     and  may either be paid to  the Person in whose name  this Security (or one
     or more Predecessor Securities)  is registered at the close of  business on
     a  Special Record Date  for the  payment of  such Defaulted Interest  to be
     fixed  by  the  Company,  notice  whereof  shall  be given  to  Holders  of
     Securities   not  less  than  10 days  prior   to such Special Record Date,
     or be paid  at any time in  any other lawful  manner not inconsistent  with
     the requirements of any securities  exchange on which the Securities may be


     ________________________

     *  This language shall appear on each Global Security.

                                        - 24 -
<PAGE>






     listed, and upon such  notice as may be required  by such exchange, all  as
     more fully provided in the Indenture.  Payments  of principal shall be made
     upon  the surrender of  this Security at  the option  of the Holder  at the
     Corporate Trust Office  of the Trustee, or  at such other office  or agency
     of the Company as may be  designated by it for such purpose  in the Borough
     of Manhattan, The City of New York,  in such coin or currency of the United
     States of America as at the  time of payment shall be legal tender for  the
     payment of public  and private debts or  at such other offices  or agencies
     as the Company  may designate, by United  States Dollar check drawn  on, or
     transfer  to a United  States Dollar  account (such  a transfer to  be made
     only to a Holder  of an aggregate principal amount of Securities  in excess
     of  U.S. $2,000,000,  and only  if  such Holder  shall have  furnished wire
     instructions in writing  to the Trustee no later than  15 days prior to the
     relevant payment date) maintained  by the payee with a bank in  the Borough
     of Manhattan, The City of New  York.  Payment of interest on this  Security
     may be made by  United States Dollar check drawn  on a bank in  the Borough
     of Manhattan,  The City of  New York  mailed to the  address of the  Person
     entitled thereto as  such address shall  appear in  the Security  Register,
     or, upon  written  application by  the  Holder  to the  Security  Registrar
     setting forth  wire instructions not  later than the  relevant Record Date,
     by transfer to a  United States Dollar account (such a  transfer to be made
     only to a  Holder of an aggregate principal  amount of Securities in excess
     of U.S.  $2,000,000  and only  if  such Holder  shall have  furnished  wire
     instructions in writing to the Trustee  no later than 15 days prior  to the
     relevant payment date)  maintained by the payee with  a bank in the Borough
     of Manhattan, The City of New York.

           The Company  will  pay  to  the Holder  of  this  Security who  is  a
     non-resident of  Canada (within the meaning of the Income Tax Act (Canada))
     such  additional  amounts   ("Canadian  Additional  Amounts")  as   may  be
     necessary in order that every net payment of the principal of, premium,  if
     any, and  interest on  this Security  (including payment  on redemption  or
     repurchase), after  deduction  or withholding  for  or  on account  of  any
     present or  future tax, assessment  or governmental charge  imposed upon or
     as a result of such payment by the Government of Canada  or of any province
     or  territory thereof  or by  any authority  or agency  thereof  or therein
     ("Taxing  Jurisdiction")  ("Canadian Taxes"),  will  not be  less  than the
     amount provided for in this Security to be  then due and payable; provided,
     that no  Canadian Additional  Amounts  will be  payable with  respect to  a
     payment  or credit  made to  a Holder  of, or  on behalf  of an owner  of a
     beneficial interest in,  this Security (collectively, a  "Canadian Excluded
     Holder") (i) with  whom the Company does  not deal at arms'  length (within
     the meaning  of the Income  Tax Act  (Canada)) at the  time of making  such
     payment or credit, or (ii) which is subject to Canadian Taxes by reason  of
     its being  connected  with Canada  or  any  province or  territory  thereof
     (including, without limitation, by reason  of such person being  a resident
     or  being deemed to  be a  resident of  Canada (within  the meaning  of the
     Income Tax Act (Canada)) or carrying on  business or being deemed to  carry
     on business  (within the  meaning  of such  act) in  Canada whether  in  or
     through a permanent  establishment or fixed  base in  Canada or  otherwise)
     otherwise than  by the  mere holding  of this  Security or  the receipt  of
     payments or credits  thereunder or (iii)  which could  obtain an  exemption

                                        - 25 -
<PAGE>






     from, or reduction  in, the applicable Canadian Tax by satisfying reporting
     or certification requirements  imposed by the relevant  Taxing Jurisdiction
     and which fails to do so. 

           The  Company will also  pay to  the Holder of this  Security who is a
     United States  Alien  (as defined  below)  such additional  amounts  ("U.S.
     Additional Amounts,"  and together  with the  Canadian Additional  Amounts,
     "Additional  Amounts") as may be necessary in  order that every net payment
     of the principal of,  premium, if any, and interest on this Security, after
     deduction or withholding  for or on account  of any present or  future tax,
     assessment  or governmental  charge  imposed upon  or as  a result  of such
     payment  by  the United  States  or  any  political  subdivision or  taxing
     authority  thereof  or therein  ("U.S. Taxes,"  and together  with Canadian
     Taxes, "Taxes"),  will not  be less than  the amount  provided for in  this
     Security to be then due and payable;  provided, however, that the foregoing
     obligation to pay U.S. Additional Amounts will not apply with respect to:

                  (a)   any  U.S. Tax  that would not have  been  so imposed but
           for  (i) the existence  of any  present or  former connection between
           such Holder  (or between a  fiduciary, settlor, beneficiary,  member,
           shareholder  of or  possessor of  a power over  such Holder,  if such
           Holder is an  estate, a  trust, a partnership  or a corporation)  and
           the United States  or any  political subdivision or taxing  authority
           thereof or  therein, including, without  limitation, such Holder  (or
           such  fiduciary,   settlor,  beneficiary,   member,  shareholder   or
           possessor) being or having  been a citizen or resident of the  United
           States or  treated as  a resident  thereof, or being  or having  been
           engaged in  a trade  or  business or  present therein,  or having  or
           having had a permanent establishment therein,  or (ii) such  Holder's
           present  or former status  as a  personal holding  company, a foreign
           personal holding  company with  respect to  the United  States, or  a
           foreign private foundation or foreign tax  exempt entity for U.S. tax
           purposes, or a corporation which  accumulates earnings to  avoid U.S.
           federal Income tax;

                  (b)   any U.S. Tax  that would  not have been  so imposed  but
           for the presentation by  the Holder of this Security for payment on a
           date more than  15 days after the date  on which such payment  became
           due  and  payable  or  the  date  on which  payment  thereof  is duly
           provided for, whichever occurs later;

                  (c)   any  U.S. Tax  that  is  an estate,  inheritance,  gift,
           sales,  transfer, personal  property or  similar tax,  assessment  or
           governmental charge;

                  (d)   any U.S.  Tax that would  not have been  imposed but for
           the  failure to  comply  with any  certification,  identification  or
           other reporting  requirements concerning  the nationality, residence,
           identity or  connection  with the  United  States  of the  Holder  or
           beneficial owner  of  this  Security, if  compliance is  required  by
           statute or  by regulation of the  United States as  a precondition to
           relief or exemption from such U.S. Tax;

                                        - 26 -
<PAGE>






                  (e)   any  U.S.  Tax   that  is  payable  otherwise   than  by
           deduction or withholding  from payment of  principal of,  premium, if
           any, or interest on this Security;

                  (f)   any U.S.  Tax  imposed  on  a Holder  that  actually  or
           constructively owns  10% or more of  the total  combined voting power
           of all  classes of stock of the Company entitled to vote or that is a
           controlled foreign corporation  related to the Company through  stock
           ownership;

                  (g)   any  U.S. Tax  required  to be  withheld  by any  Paying
           Agent  from any  payment of  the  principal of,  premium, if  any, or
           interest on any  Security, if such payment  can be made  without such
           withholding by any other Paying Agent in Western Europe;

                  (h)   any U.S. Tax imposed  on a Holder that is  a partnership
           or a   fiduciary  or other  than the  sole beneficial  owner  of such
           payment, but only to the extent  that any beneficial owner  or member
           of the  partnership or  beneficiary or  settlor with  respect to  the
           fiduciary  would  not have  been  entitled  to  the  payment of  U.S.
           Additional Amounts had  the beneficial owner, member, beneficiary  or
           settlor directly been the Holder of this Security; or

                  (i)   any combination of  items (a), (b), (c), (d),  (e), (f),
           (g) and (h).

     (The  Holder of this Security with respect to  which any of the listed U.S.
     Taxes becomes payable  is referred to  herein as a "U.S.  Excluded Holder,"
     and U.S.  Excluded Holders,  together with  Canadian  Excluded Holders,  as
     "Excluded Holders.")

           The  Company will make  any deduction  or withholding,  and remit the
     full amount deducted or withheld  to the relevant authority,  in accordance
     with  applicable  law.    The  Company  will  furnish  the  Holders of  the
     Securities, within  30 days after the date the payment  of any Taxes is due
     pursuant to  applicable law,  certified copies  of tax  receipts evidencing
     such payment by the Company.  The Company will indemnify and hold  harmless
     each Holder  of,  or owner  of a  beneficial  interest in,  the  Securities
     (other than an  Excluded Holder) and  upon written  request reimburse  such
     Holder, or owner of a beneficial  interest, for the amount of (i) any Taxes
     levied  or imposed  and  paid by  such  Holder, or  owner  of a  beneficial
     interest, as  a result  of payments  made with respect  to the  Securities,
     (ii) any  liability (including  penalties, interest  and expenses)  arising
     from or with respect to Taxes, and (iii) any Taxes imposed with respect  to
     payment  of  Additional  Amounts  or  any reimbursement  pursuant  to  this
     sentence.

           Notwithstanding the foregoing, the Company shall not be obligated  to
     pay  Additional  Amounts  in  respect  of  payments  becoming  due  on  the
     Securities  more than 15  days after  the redemption date  for a redemption
     described under  "Redemption for Taxation  Reasons," except  to the  extent
     that the  Company's obligations  to pay  such Additional  Amounts does  not

                                        - 27 -
<PAGE>






     arise from  the Tax  Law  Change that  resulted in  such redemption.    For
     purposes of this Security,  a "United States Alien" is any person  who, for
     U.S. federal income tax purposes,  is a foreign corporation,  a nonresident
     alien individual,  a nonresident  alien fiduciary  of a  foreign estate  or
     trust, or a  foreign partnership one  or more of the  members of which  is,
     for U.S. federal  income tax purposes, a foreign corporation, a nonresident
     alien  individual or a nonresident  alien fiduciary of  a foreign estate or
     trust.

           At least 30  days prior  to each date on  which any payment under  or
     with respect to the Securities is  due and payable, if the Company  will be
     obligated to  pay Additional  Amounts with  respect to  such payments,  the
     Company will  deliver to the  Trustee an Officers'  Certificate stating the
     fact that  such Additional Amounts will be payable,  the amounts so payable
     and will set forth  such other information necessary to enable  the Trustee
     to  pay  such  Additional Amounts  to  Holders  or owners  of  a beneficial
     interest in the Securities, as the case may be, on the payment date.

           Except as  specifically provided  herein  and in  the Indenture,  the
     Company shall  not be  required to  make any  payment with  respect to  any
     governmental charge imposed by any government  or any political subdivision
     or taxing  authority thereof or  therein.  Whenever in  this Security there
     is  a reference,  in  any context,  to  the payment  of  the principal  of,
     premium,  if any,  or  interest on,  or in  respect  of, any  Security such
     mention shall be  deemed to include  mention of the  payment of  Additional
     Amounts  payable as  described  in the  second  preceding paragraph  to the
     extent that,  in such  context, Additional  Amounts are,  were or would  be
     payable in respect  of such Security and express  mention of the payment of
     Additional  Amounts (if  applicable)  in any  provisions  of this  Security
     shall not be  construed as excluding Additional Amounts in those provisions
     of this Security where such express mention is not made.

           Reference is hereby made to the  further provisions of this  Security
     set forth  on the reverse  hereof, which  further provisions shall  for all
     purposes have the same effect as if set forth at this place.

           Unless the certificate of  authentication hereon has been executed by
     the  Trustee referred to  on the reverse hereof  or an Authenticating Agent
     by the manual  signature of one of their respective authorized signatories,
     this Security shall  not be entitled to any  benefit under the Indenture or
     be valid or obligatory for any purpose.

           IN  WITNESS WHEREOF, the Company  has caused this Security to be duly
     executed under its corporate seal.

     Dated:


                                                 NORTH AMERICAN VACCINE, INC.

     [Corporate Seal]                            By:_____________________
                                                     Name:

                                        - 28 -
<PAGE>






                                                     Title:

     Attest:


     __________________________
     Name:
                                       Title:













































                                        - 29 -
<PAGE>






                                  [FORM OF REVERSE]

           This Security is one of a duly authorized  issue of securities of the
     Company designated as  its "6.50% Convertible Subordinated Notes due May 1,
     2003"  (herein called  the "Securities"),  limited  in aggregate  principal
     amount  to U.S. $86,250,000,  issued and  to be issued  under an Indenture,
     dated  as of  May  7, 1996  (herein  called the  "Indenture"), between  the
     Company and Marine Midland Bank,  as Trustee (herein called  the "Trustee",
     which term  includes any successor  trustee under the  Indenture), to which
     Indenture  and all indentures supplemental thereto reference is hereby made
     for a statement  of the respective  rights, limitations  of rights,  duties
     and  immunities thereunder  of  the Company,  the  Trustee, the  holders of
     Senior Indebtedness  and the Holders  of the  Securities and  of the  terms
     upon which the Securities are,  and are to be, authenticated and delivered.
     The  Securities  are  issuable  only  in  fully  registered  form,  without
     coupons, in the denomination of U.S. $1,000 and integral  multiples of U.S.
     $1,000 in  excess thereof.   In the  case of  Securities initially sold  to
     Institutional  Accredited  Investors,  the Securities  will  be  issued  in
     minimum  denominations  of $250,000  and  integral multiples  of  $1,000 in
     excess thereof,  but  on  subsequent  transfers  made  in  accordance  with
     applicable transfer  restrictions, will  be available  in denominations  of
     $1,000 and  integral multiples thereof.   As provided in  the Indenture and
     subject  to   certain  limitations  therein   set  forth,  Securities   are
     exchangeable for a  like aggregate principal  amount of  Securities of  any
     authorized  denominations as requested by the  Holder surrendering the same
     upon  surrender of  the Security  or  Securities to  be  exchanged, at  the
     Corporate Trust Office of the Trustee  or at such other office or agency of
     the Company as may be designated  by it for such purpose in the Borough  of
     Manhattan, The City  of New York  or at such  other offices or agencies  as
     the Company may  designate (each a "Transfer  Agent").  The  Transfer Agent
     will  then forward  such surrendered Securities  (together with any payment
     surrendered  therewith)  to the  Trustee who  in  turn will  issue  the new
     Securities.

           No sinking fund is provided for the  Securities.  The Securities  are
     subject  to redemption at the option of the Company at any time on or after
     May  1, 1999, in whole or in  part, upon not less  than 30 nor more than 60
     days' notice to the  Holders prior to the Redemption Date at  the following
     Redemption Prices  (expressed as percentages  of the principal amount)  for
     the twelve-month period beginning on May 1 of the following years:

                Year                Redemption Price

                1999                   103.714 %
                2000                   102.786 %
                2001                   101.857 %
                2002                   100.929 %


     and  thereafter at  a  Redemption  Price equal  to  100%  of the  principal
     amount, together, in  each case, with  accrued interest  to the  Redemption
     Date.

                                        - 30 -
<PAGE>






           Securities are also redeemable, in  whole but not in  part, under the
     circumstances described in the next  succeeding paragraph, at a  Redemption
     Price equal  to 100% of the principal amount  thereof plus interest accrued
     to the Redemption Date and  any Additional Amount: provided,  however, that
     interest installments  on Securities whose  Stated Maturity is  on or prior
     to such Redemption Date  will be payable to the Holders of such Securities,
     or one or  more Predecessor Securities, of record  at the close of business
     on  the relevant  Record  Dates referred  to  on the  face  hereof, all  as
     provided in the Indenture.

           If as a result  of a Tax  Law Change, the Company has or  will become
     obligated  to pay  to the  Holder  of any  Security Additional  Amounts, as
     described in the second and third paragraphs of the face of this  Security,
     and such  obligation cannot  be avoided  by the  Company taking  reasonable
     measures available to it, then the Company  may, at its option, redeem  the
     Tax Affected Securities as a  whole, but not in part, upon not less than 30
     nor more than 60 days' notice to the Holders  prior to the Redemption Date,
     at a Redemption Price equal to 100%  of the principal amount plus  interest
     accrued to  the Redemption Date,  and any Additional  Amounts then payable;
     provided, that  (i) no  such notice  of redemption shall  be given  earlier
     than  90 days prior  to the  earliest date  on which  the Company  would be
     obligated to pay  any such Additional Amounts were  a payment in respect of
     the Tax  Affected Securities then due  and (ii) at the  time such notice of
     redemption  is  given,  such  obligation  to  pay  such  Additional Amounts
     remains in effect.   Prior to the  publication of any notice  of redemption
     pursuant to  this paragraph, the Company  shall deliver to the  Trustee (a)
     an Officers' Certificate  stating that the  Company is  entitled to  effect
     such  redemption and setting  forth a  statement of facts  showing that the
     conditions  precedent  to the  right  of  the  Company  so to  redeem  have
     occurred and  (b) an  Opinion of  Counsel selected  by the  Company to  the
     effect  that  the  Company  has  or  will  become  obligated  to  pay  such
     Additional Amounts  as a  result of  such Tax  Law Change.   The  Company's
     right to redeem the Tax Affected Securities  shall continue as long as  the
     Company  is obligated to pay such  Additional Amounts, notwithstanding that
     the Company shall  have made payments  of Additional  Amounts specified  in
     such second paragraph.

           In the event of a redemption of the Securities, the Company will  not
     be required (a)  to register the transfer  or exchange of Securities  for a
     period  of  15   days  immediately  preceding  the  date  notice  is  given
     identifying  the   serial  numbers  of  the   Securities  called  for  such
     redemption, or  (b) to register the  transfer or exchange of  any Security,
     or portion thereof, called for redemption.

           Notice  to the Holders will be given at least  twice not less than 30
     nor  more than  60 days  prior to  the Redemption  Date as provided  in the
     Indenture.

           In any case  where the due date for  the payment of the principal of,
     premium,  if any,  or  interest, including  Additional Amounts  and Special
     Interest, on any Security or the last day  on which a Holder of a  Security
     has a right  to convert his Security shall  be, at any Place of  Payment or

                                        - 31 -
<PAGE>






     Place  of  Conversion,  as  the  case  may  be,  a  day  on  which  banking
     institutions  at  such   Place  of  Payment  or  Place  of  Conversion  are
     authorized or obligated by  law or executive order  to close, then  payment
     of  principal, premium,  if any, or  interest, including Additional Amounts
     and Special Interest, or delivery for conversion of such  Security need not
     be made on or by such date at  such place but may be made on or by the next
     succeeding  day  at  such  place  which  is  not  a day  on  which  banking
     institutions  are authorized  or  obligated by  law  or executive  order to
     close, with the  same force  and effect  as if made  on the  date for  such
     payment or the date  fixed for  redemption or repurchase,  or by such  last
     day for conversion, and  no interest shall accrue on the amount  so payable
     for the period after such date.

           Subject to and upon compliance with  the provisions of the Indenture,
     the  Holder of this Security  is entitled at his  option, at any time after
     90 days following the  latest of  the commencement of  the offering of  the
     Securities, the original  issue date of  the Securities and the  issue date
     with respect to any additional Securities issued to  cover over-allotments,
     and  on or  before the close  of business on  May 1, 2003,  or in case this
     Security or a portion hereof is called for  redemption or the Holder hereof
     has exercised his right to require the Company  to repurchase this Security
     or  such  portion  hereof,  then  in respect  of  this  Security  until and
     including,  but (unless the Company defaults in making the payment due upon
     redemption or  repurchase, as  the case  may be)  not after,  the close  of
     business on the Redemption  Date or  the Repurchase Date,  as the case  may
     be,  to convert  this Security  (or  any portion  of  the principal  amount
     hereof  that is an  integral multiple of U.S.  $1,000) into  fully paid and
     nonassessable Common Shares of the  Company at an initial  Conversion Price
     of  U.S.  $24.858  for  each  Common  Share  (or  at  the  current adjusted
     Conversion  Price  if  an  adjustment has  been  made  as  provided  in the
     Indenture) by surrender of this Security, duly  endorsed or assigned to the
     Company or in  blank and, in case such  surrender shall be made  during the
     period  from  the  close  of  business  of  any Regular  Record  Date  next
     preceding any Interest  Payment Date  to the  opening of  business on  such
     Interest Payment  Date ("Interest  Period") (except  Securities called  for
     redemption on a Redemption Date or to  be repurchased on a Repurchase  Date
     during, in  each case, such  Interest Period), also  accompanied by payment
     in New York Clearing  House or other funds acceptable to the  Company of an
     amount equal to the interest payable on  such Interest Payment Date on  the
     principal amount  of  this Security  then  being  converted, and  also  the
     conversion notice hereon  duly executed, to  the Company  at the  Corporate
     Trust Office  of the Trustee,  or at  such other  office or  agency of  the
     Company, subject to  any laws or regulations applicable thereto and subject
     to the right of the Company to terminate  the appointment of any Conversion
     Agent (as  defined below) as  may be designated  by it for  such purpose in
     the Borough of Manhattan,  The City of New  York, or at such other  offices
     or  agencies as  the  Company may  designate  (each a  "Conversion Agent").
     Subject to the  aforesaid requirement  for payment and,  in the  case of  a
     conversion  after  the  Regular Record  Date  next  preceding any  Interest
     Payment Date and on or before  such Interest Payment Date, to the  right of
     the  Holder of this  Security (or  any Predecessor  Security) of  record at
     such Regular  Record Date to  receive an installment  of interest,  no cash

                                        - 32 -
<PAGE>






     payment or  adjustment  is  to  be  made on  conversion,  if  the  date  of
     conversion is not  an Interest Payment  Date, for  interest accrued  hereon
     from the Interest Payment  Date next preceding the  date of conversion,  or
     for  dividends on  the Common  Shares  issued on  conversion  hereof.   The
     Company  shall thereafter deliver to the  Holder the fixed number of Common
     Shares (together  with any cash  adjustment, as provided  in the Indenture)
     into  which this Security is  convertible and such  delivery will be deemed
     to satisfy  the Company's obligation  to pay the  principal amount  of this
     Security.   No  fractions of  shares  or  scrip representing  fractions  of
     shares will  be  issued  on  conversion,  but  instead  of  any  fractional
     interest (calculated  to the nearest 1/100th of  a share) the Company shall
     pay a cash adjustment as provided in  the Indenture.  The Conversion  Price
     is subject to  adjustment as provided in the Indenture.    In addition, the
     Indenture provides  that in case  of certain amalgamations,  consolidations
     or mergers  to which  the Company  is a  party or  the transfer  of all  or
     substantially all of the property and assets of the  Company, the Indenture
     shall be  amended, without  the consent  of any  Holders of  Securities, so
     that this  Security, if  then Outstanding, will  be convertible thereafter,
     during the  period this Security  shall be convertible  as specified above,
     only  into the  kind and  amount  of securities,  cash  and other  property
     receivable upon such  amalgamation, consolidation, merger or transfer  by a
     holder of  the number  of  Common Shares  of the  Company into  which  this
     Security could have been converted immediately prior to such  amalgamation,
     consolidation,  merger, sale or transfer,  but subject  to all requirements
     necessary to ensure  that the Securities  will not be  subject to  Canadian
     withholding tax  as a result  thereof, and assuming  such holder of  Common
     Shares is not  a Person with which  the Company consolidated or  into which
     the Company merged or which merged  into the Company or to which such  sale
     or  transfer was made,  as the case  may be,  or an Affiliate  thereof and,
     failed to  exercise any  rights of  election as  to the kind  or amount  of
     securities,  cash or  other property  receivable  upon such  consolidation,
     merger,  sale or  transfer  and further  assuming,  if such  consolidation,
     amalgamation,  arrangement,  merger, conveyance,  transfer,  sale or  lease
     occurs prior to the  later of 60 days  following the latest  of (i) May  7,
     1996 and  (ii) the latest date of original issue  of any Security, that the
     Security was  convertible at the time of such  occurrence at the Conversion
     Price specified above  as adjusted from the issue  date of such Security to
     such  time  as provided  in  the  Indenture,  subject  to any  requirements
     necessary to  ensure that  the Securities  will be  and will  remain exempt
     from   Canadian   withholding  tax   including,  without   limitation,  the
     requirement in effect on the date hereof that  a Holder of Securities shall
     not be  entitled to  receive shares,  other securities  or property,  other
     than securities that  are "prescribed securities" as  defined in Regulation
     6208  to  the  Income  Tax  Act  (Canada),  in  the  event  that  any  such
     amalgamation, consolidation, merger  or transfer occurs in or prior to five
     years after the  date of original issue of the Securities.  Notwithstanding
     any provision to  the contrary if such amalgamation, consolidation, merger,
     or transfer  occurs on  or prior  to 5  years from  the date  which is  the
     latest  date of original issuance of  a Security issued hereunder, a holder
     of a Security  shall not be entitled  in any circumstances to  convert such
     Security  into any  securities, cash  or  other property  (the "Substituted
     Properties")   unless   such   Substituted   Properties   are   "prescribed

                                        - 33 -
<PAGE>






     securities"  with  respect  to   the  Security   for  purposes  of   clause
     212(1)(b)(vii)(E) of  the Income  Tax Act  (Canada). No  adjustment in  the
     Conversion Price  will  be made  until  such  adjustment would  require  an
     increase or decrease  of at least one percent  of such price, provided that
     any adjustment  that would  otherwise be made  will be carried  forward and
     taken into account in the computation of any subsequent adjustment.

           Subject  to certain limitations  in the  Indenture, at  any time when
     the Company is not  subject to Section 13 or  15(d) of the Exchange  Act or
     exempt  from  such  requirements  pursuant  to  Rule  12g3-2(b)  under  the
     Exchange Act, upon the  request of a Holder of a Restricted Security or the
     holder of  Common Shares issued  upon conversion thereof,  the Company will
     promptly  furnish  or cause  to  be  furnished  Rule  144A Information  (as
     defined below) to such  Holder of Restricted Securities  or such holder  of
     Common Shares  issued upon  conversion of  Restricted Securities,  or to  a
     prospective purchaser  of any such  security designated by  any such Holder
     or holder, as the case may be, to the  extent required to permit compliance
     by such  Holder  or holder  with  Rule 144A  under  the Securities  Act  in
     connection  with the resale of any such  security.  "Rule 144A Information"
     shall  be such  information  as is  specified  pursuant to  Rule 144A(d)(4)
     under the Securities Act (or any successor provision thereto).

           The  Holder of  this Security  and the  Common Shares  of the Company
     issuable  upon  conversion  thereof  is  entitled  to  the  benefits  of  a
     Registration  Rights  Agreement, dated  as  of  May  1,  1996, between  the
     Company and Goldman, Sachs & Co. and  UBS Securities LLC (the "Registration
     Rights Agreement").   Pursuant  to the  Registration Rights  Agreement, the
     Company has agreed for the benefit of the Holders from time  to time of the
     Securities and the Common Shares  issuable upon conversion thereof  that it
     will, at its expense, (a)  within 90 days after the date of issuance of the
     Securities, file  a shelf registration  statement (the "Shelf  Registration
     Statement") with the Commission with  respect to resales of  the Securities
     and the  Common Shares  issuable upon  conversion thereof,  (b) within  180
     days after the date of issuance of the Securities, use its reasonable  best
     efforts  to  cause  such  Shelf  Registration   Statement  to  be  declared
     effective by  the Commission  and (c) use  its reasonable  best efforts  to
     maintain  such Shelf  Registration  Statement continuously  effective under
     the Securities Act, as amended, until the third  anniversary of the date of
     the effectiveness  of the Shelf  Registration Statement or  such other date
     as is provided in the Registration Rights Agreement.

           If  (i) on  or  prior to  90  days  following  the date  of  original
     issuance of the  Securities, a Shelf  Registration Statement  has not  been
     filed with  the Commission, or (ii) on or  prior to the 180th day following
     the date  of original issuance  of the Securities,  such Shelf Registration
     Statement  is not  declared  effective  (each, a  "Registration  Default"),
     special  interest ("Special  Interest") will accrue  on this  Security from
     and including the  day following such Registration Default to but excluding
     the  day  on  which such  Registration  Default  has been  cured.   Special
     Interest will be paid semi-annually in arrears, with the first semi  annual
     payment  due  on  the  first  interest  payment  date  in  respect  of  the
     Securities  following the  date  on which  such  Special Interest  begin to

                                        - 34 -
<PAGE>






     accrue,  and will  accrue  at  a rate  per  annum  equal to  an  additional
     onequarter  of  one   percent  (0.25%)  of  the  principal  amount  of  the
     Securities  to  and including  the  90th  day following  such  Registration
     Default and at  a rate per annum  equal to one-half of one  percent (0.50%)
     thereof from  and after the  91st day following  such Registration Default.
     In the event  that the Shelf Registration Statement  ceases to be effective
     prior to the  third anniversary of the initial  effective date of the Shelf
     Registration  Statement  or  such  other   date  as  is  provided   in  the
     Registration Rights  Agreement for a period  in excess of 60  days, whether
     or not  consecutive, during  any 12-month  period, then  the interest  rate
     borne by the  Securities shall  increase by an  additional one-half of  one
     percent (0.50%)  per  annum on  the  61st day  of the  applicable  12-month
     period such  Shelf Registration  Statement ceases  to be  effective to  but
     excluding the day on which  the Shelf Registration Statement  again becomes
     effective.

           Whenever in this Security  there is a  reference, in any context,  to
     the payment of  the principal of,  premium, if any, or  interest on, or  in
     respect of, any  Security such mention shall  be deemed to  include mention
     of the  payment of Special Interest  payable as described in  the preceding
     paragraph to the extent  that, in such context, Special Interest is, was or
     would be payable in  respect of  such Security and  express mention of  the
     payment  of Special  Interest  (if applicable)  in  any provisions  of this
     Security shall  not be  construed as  excluding Special  Interest in  those
     provisions of this Security where such express mention is not made.

           The Holder  of this Security, by its acceptance thereof, agrees to be
     bound  by the terms  of the  Registration Rights Agreement  relating to the
     Securities and the Common Shares issuable upon conversion thereof.

           If a  Change in  Control occurs, the  Holder of  this Security  shall
     have  the right,  in accordance  with the  provisions of the  Indenture, to
     require  the Company  to repurchase  this Security  (or any  portion of the
     principal amount hereof that  is an integral  multiple of $1,000) for  cash
     at a Repurchase  Price equal to 100%  of the principal amount  thereof plus
     interest  accrued to the  Repurchase Date.  At  the option  of the Company,
     the Repurchase Price may  be paid in cash or, as provided in the Indenture,
     by  delivery of  Common Shares  having a  fair  market value  equal to  the
     Repurchase Price; provided  that payment may  not be made in  Common Shares
     unless  at  the  time  of  payment  such  stock  is listed  on  a  national
     securities  exchange or quoted on Nasdaq.   For purposes of this paragraph,
     the fair market value of Common Shares  shall be determined by the  Company
     and shall be equal to  95% of the average  of the Closing Prices Per  Share
     for  the five  consecutive Trading  Days immediately  preceding the  second
     Trading Day  immediately preceding the  Repurchase Date.   Whenever in this
     Security  there is a  reference, in  any context,  to the principal  of any
     Security as  of  any  time,  such reference  shall  be  deemed  to  include
     reference to  the Repurchase Price payable  in respect of such  Security to
     the extent  that such Repurchase  Price is, was or  would be so  payable at
     such time, and express mention of the Repurchase  Price in any provision of
     this Security shall not be  construed as excluding the Repurchase  Price in
     those provisions of this Security when such express mention is not made.

                                        - 35 -
<PAGE>






           [The following paragraph shall appear  in each Security that is not a
     Global Security:

           In  the  event  of  redemption,  repurchase  or  conversion  of  this
     Security in  part only,  a new Security  or Securities for  the unredeemed,
     unrepurchased or unconverted  portion hereof will be issued  in the name of
     the Holder hereof.]

           [The following paragraph shall appear in each Global Security:

           In  the event  of a  deposit or  withdrawal of  an interest  in  this
     Security,  including  an  exchange,  transfer,  redemption,  repurchase  or
     conversion of this Security in part only, the Trustee, as custodian of  the
     Depositary,  shall  make an  adjustment  on  its  records  to reflect  such
     deposit or  withdrawal in accordance with  the rules and procedures  of the
     Depositary.]

           The indebtedness evidenced by this Security  is, to the extent and in
     the  manner provided in the Indenture, subordinate  and subject in right of
     payment to  the prior  payment in full  of all  Senior Indebtedness of  the
     Company,  and this  Security is  issued subject  to such provisions  of the
     Indenture  with  respect  thereto.    Each  Holder  of  this  Security,  by
     accepting the same,  (a) agrees to and  shall be bound by  such provisions,
     (b) authorizes and  directs the Trustee on  his behalf to take  such action
     as  may be  necessary  or appropriate  to  effectuate the  subordination so
     provided and (c) appoints the Trustee his  attorney-in-fact for any and all
     such purposes.

           If an  Event of Default, other  than an Event  of Default arising  by
     reason  of a  Change  of  Control,  shall  occur  and  be  continuing,  the
     principal of  all the  Securities, together  with accrued  interest to  the
     date of  declaration, may  be declared due  and payable  in the manner  and
     with the effect provided in the Indenture.  Upon payment  (i) of the amount
     of principal  so declared due  and payable, together  with accrued interest
     to the date of  declaration, and (ii) of interest on any  overdue principal
     and overdue interest, all  of the Company's obligations  in respect of  the
     payment  of  the   principal  of  and  interest  on  the  Securities  shall
     terminate; provided, that  in the event of  an Event of Default  arising by
     reason of  a Change of Control such Event  of Default will be cured after a
     Change  of Control offer is  made and all  Securities properly tendered for
     purchase pursuant to such  Change of Control offer are accepted for payment
     and such payment is made.

           The Indenture permits,  with certain exceptions as therein  provided,
     the amendment  thereof and the  modification of the  rights and obligations
     of the Company and  the rights of the  Holders of the Securities under  the
     Indenture at any time by  the Company and the  Trustee with either (a)  the
     written  consent of the  Holders of a majority  in principal  amount of the
     Securities  at  the  time  Outstanding,  or  (b)  by  the   adoption  of  a
     resolution, at a meeting of Holders of the Outstanding Securities at  which
     a quorum is present,  by the Holders of 66-2/3% in principal  amount of the
     Outstanding Securities represented  and entitled to vote  at such  meeting.

                                        - 36 -
<PAGE>






     The  Indenture also contains provisions permitting the Holders of specified
     percentages in principal  amount of the Securities at the time Outstanding,
     on behalf of  the Holders of all the Securities, to waive compliance by the
     Company with certain  provisions of the Indenture and certain past defaults
     under the Indenture and their consequences.  Any  such consent or waiver by
     the Holder  of this  Security  shall be  conclusive and  binding upon  such
     Holder and upon all  future Holders  of this Security  and of any  Security
     issued in exchange  herefor or in lieu  hereof, whether or not  notation of
     such consent or waiver is made upon this Security or such other Security.

           As provided in  and subject to  the provisions of the  Indenture, the
     Holder  of  this  Security  shall  not  have  the  right  to institute  any
     proceeding  with  respect to  the  Indenture or  for  the appointment  of a
     receiver or trustee or for  any other remedy thereunder, unless such Holder
     shall have  previously given  the Trustee  written notice  of a  continuing
     Event of  Default,  the Holders  of at  least  25% in  aggregate  principal
     amount of the  Outstanding Securities shall  have made  written request  to
     the  Trustee to institute proceedings  in respect of  such Event of Default
     as Trustee and  offered the Trustee  reasonable indemnity  and the  Trustee
     shall not have received from the Holders of  a majority in principal amount
     of the Securities  Outstanding a direction inconsistent with  such request,
     and shall have  failed to institute any such  proceeding, for 60 days after
     receipt of such  notice, request  and offer  of indemnity.   The  foregoing
     shall not apply to any suit  instituted by the Holder of this  Security for
     the enforcement of  any payment of  principal hereof, premium,  if any,  or
     interest hereon (including any Additional Amounts  and Special Interest) on
     or  after the respective due dates  expressed herein or for the enforcement
     of the right to convert this Security as provided in the Indenture.

           No  reference  herein to  the  Indenture  and  no  provision of  this
     Security or of  the Indenture shall alter  or impair the obligation  of the
     Company, which  is absolute  and unconditional,  to pay  the principal  of,
     premium, if any,  and interest on (including Additional Amounts and Special
     Interest,  as described  herein)  this Security  at  the times,  places and
     rate, and in the coin, currency, or in  the securities herein prescribed or
     to convert this Security as provided in the Indenture.

           As provided  in  the Indenture  and  subject  to certain  limitations
     therein  set  forth, the  transfer  of  Securities  is  registrable on  the
     Security  Register  upon  surrender  of  a  Security  for  registration  of
     transfer (a) at the Corporate Trust Office of the Trustee or  at such other
     office or  agency of  the  Company as  may  be designated  by it  for  such
     purpose in the Borough  of Manhattan, The City of New York,  or (b) subject
     to any  laws or  regulations applicable  thereto and  to the  right of  the
     Company  to terminate the appointment of any Transfer Agent, at the offices
     of  the Transfer  Agents  described herein  or  at  such other  offices  or
     agencies as the Company may  designate, duly endorsed by, or accompanied by
     a written  instrument of transfer in  form satisfactory to the  Company and
     the Security  Registrar  duly  executed  by,  the  Holder  thereof  or  his
     attorney duly  authorized  in  writing,  and  thereupon  one  or  more  new
     Securities,  of  authorized  denominations  and  for   the  same  aggregate
     principal   amount,  will  be  issued  to   the  designated  transferee  or

                                        - 37 -
<PAGE>






     transferees  by the Registrar.   No  service charge  shall be made  for any
     such registration  of transfer  or exchange,  but the  Company may  require
     payment  of a  sum  sufficient to  recover  any tax  or  other governmental
     charge payable in connection therewith.

           Prior  to  due  presentation  of   a  Security  for  registration  of
     transfer,  the Company, the  Trustee and  any agent  of the Company  or the
     Trustee may treat the Person in whose name  such Security is registered, as
     the  owner thereof  for  all  purposes, whether  or  not such  Security  be
     overdue, and neither  the Company, the Trustee nor  any such agent shall be
     affected by notice to the contrary.

           THE INDENTURE  AND THIS SECURITY SHALL  BE GOVERNED  BY AND CONSTRUED
     IN ACCORDANCE  WITH THE  LAWS OF THE  STATE OF NEW  YORK, UNITED  STATES OF
     AMERICA, WITHOUT REGARD TO THE PRINCIPLES OF CONFLICTS OF LAWS.

           All terms used in  this Security which  are defined in the  Indenture
     shall have the meanings assigned to them in the Indenture.


     ELECTION OF HOLDER TO REQUIRE REPURCHASE

           1.   Pursuant  to Section  14.1  of  the Indenture,  the  undersigned
     hereby elects to have this Security repurchased by the Company.

           2.  The undersigned hereby directs the Trustee or the Company to  pay
     it  or ________________________  an  amount in  cash  or, at  the Company's
     election, Common  Shares valued  as set  forth in  the Indenture,  equal to
     100%  of  the  principal  amount  hereof,  plus  interest  accrued  to  the
     Repurchase Date, as provided in the Indenture.

           3.  a.  Principal amount  to be repurchased (must  be U.S. $1,000 and
                   integral multiples thereof):                                 
                                 

               b.  Certificate Number(s): __________________________
                   and CUSIP Number(s): ____________________________

           4.  a.  Remaining   principal   amount  following   such  repurchase:
                   _______________________

               b.  Name  of the Person in  which the  remaining principal amount
                   is to be registered:_____________________________________

           5.     If  payment of  the  Repurchase Price  is to  be  made by  the
                  Company in  Common Shares, name(s) and addresses  in which the
                  certificate(s) for Common Shares shall be issued:

                  ____________________________________________________________
                  (name)
                                                                               
                  ____________________________________________________________

                                        - 38 -
<PAGE>







                  ____________________________________________________________


     Dated: _____________________


                                                 ___________________________
                                                 Signature

                                                 ___________________________
                                                 Signature Guaranteed


     Principal amount to be repurchased: ______________

     Remaining principal amount following such repurchase: _____________

     NOTICE: The  signature to  the foregoing  Election must  correspond to  the
     Name  as written  upon  the  face of  this  Security in  every  particular,
     without alteration or any change whatsoever.
































                                        - 39 -
<PAGE>






     <TABLE>
     <CAPTION>
                                                       [GLOBAL SECURITIES]

                                                       SCHEDULE OF EXCHANGES
                                 Principal Amount              Remaining Principal
                               Exchanged to or from           Amount of this Global
                         Regulation S Global Securities,        Security Following          Notation Made
            Date         Unrestricted Global Securities,       Such Exchange (after         on Behalf of
            Made             or Definitive Securities         increase or decrease)      Security Registrar
            ----         --------------------------------    -----------------------     ------------------

       <S>              <C>                                 <C>                          <C>

          ________                 ____________                    ____________              __________


          ________                 ____________                    ____________              __________

          ________                 ____________                    ____________              __________

          ________                 ____________                    ____________              __________

          ________                 ____________                    ____________              __________

          ________                 ____________                    ____________              __________

          ________                 ____________                    ____________              __________

          ________                 ____________                    ____________              __________

          ________                 ____________                    ____________              __________

          ________                 ____________                    ____________              __________

          ________                 ____________                    ____________              __________

          ________                 ____________                    ____________              __________

          ________                 ____________                    ____________              __________

          ________                 ____________                    ____________              __________

          ________                 ____________                    ____________              __________

          ________                 ____________                    ____________              __________

     </TABLE>





                                        - 40 -
<PAGE>






     SECTION 2.3.  Form of Conversion Notice.
                   --------------------------

           The Forms of  Conversion Notice are attached  as Annexes A-1 and  A-2
     hereto.

     SECTION 2.4.  Legend on Restricted Securities.
                   -------------------------------

           During  the period  prior to  the time the  Securities may  be resold
     without registration pursuant  to Rule 144(k) under the Securities Act (the
     expiration of  which  time  the  Company  shall  certify  in  an  Officers'
     Certificate  and  an Opinion  of Counsel),  any Security  originally issued
     otherwise than in reliance on  Regulation S, including any  Security issued
     in exchange therefor or in lieu  thereof, shall be referred to herein as  a
     "Restricted Security" and  shall be subject to the restrictions on transfer
     provided in  the legends set forth  on the face  of the form  of Restricted
     Security other  than any  Global Security  in Section  2.2 or  the form  of
     Restricted  Global  Security  in Section  2.2,  as  appropriate;  provided,
     however,  that  the  term  "Restricted  Security"  shall  not  include  any
     Securities  as to  which restrictions  have been  terminated in  accordance
     with Section  3.5.   All Restricted  Securities shall  bear the  applicable
     legends  set forth  on the  face of  the form  of Security  in Section 2.2.
     Except  as  provided  in Section  3.5,  the  Trustee  shall  not issue  any
     unlegended  Security until  it has  received an  Officers'  Certificate and
     Opinion of Counsel from the Company directing it to do so.

     SECTION 2.5  Form of Trustee's Certificate of Authentication.
                  -----------------------------------------------

           This  is one of  the Securities  referred to  in the within-mentioned
     Indenture.

     Dated:                                      MARINE MIDLAND BANK,
                                                 as Trustee


                                                 By__________________
                                                   Authorized Signatory


                                    ARTICLE THREE

                                    THE SECURITIES

     SECTION 3.1.  Title and Terms.
                    --------------

           The  aggregate   principal  amount   of  Securities   which  may   be
     authenticated  and  delivered  under  this  Indenture  is limited  to  U.S.
     $86,250,000, except for Securities authenticated and  delivered in exchange
     for, or in lieu of, other Securities pursuant to this Indenture.

                                        - 41 -
<PAGE>






           The  Securities  shall  be   known  and  designated   as  the  "6.50%
     Convertible Subordinated  Notes due May  1, 2003"  of the  Company.   Their
     Stated Maturity shall  be May 1, 2003 and they shall bear interest on their
     principal amount from May 7, 1996, payable  semi-annually in arrears on May
     1 and November  1 in each year, commencing November 1, 1996, at the rate of
     6.50% per annum  (together with any Additional Amounts and Special Interest
     the Company may be required to pay) until the principal  thereof is due and
     at  the rate of 6.50% per annum on any overdue principal and, to the extent
     permitted  by  law,  on  any  overdue  interest;  provided,  however,  that
     payments shall only be made on Business Days as provided in Section 1.12.

           The  principal of, premium,  if any,  and interest  on the Securities
     shall be  payable as  provided  in the  forms of  Securities set  forth  in
     Sections 2.2 (any  city in which any  Paying Agent is located  being herein
     called a "Place of Payment").

           The Securities shall be  redeemable at the  option of the Company  at
     any time on  or after 60 days  following the latest of  the commencement of
     the  offering of the Securities, the original  issue date of the Securities
     and the  issue date  with respect  to any additional  Securities issued  to
     cover over-allotments, in whole  or in part, and at the Company's option or
     otherwise  in the  event of  certain  developments, including  developments
     with respect to changes in Taxes, as provided in Article Eleven and  in the
     forms of Securities set forth in Section 2.2.

           The Securities  shall be  convertible as provided  in Article  Twelve
     (any city in  which any Conversion Agent  is located being herein  called a
     "Place of Conversion").

           The Securities  shall be subordinated in  right of  payment to Senior
     Indebtedness of the Company as provided in Article Thirteen.

           The Securities shall  be subject to repurchase  by the Company at the
     option of the Holders as provided in Article Fourteen.

     SECTION 3.2.  Denominations.
                   -------------

           The  Securities shall  be issuable  as registered  Securities in  the
     denomination of  U.S.  $1,000 and  integral  multiples  of U.S.  $1,000  in
     excess thereof.  In  the case of Securities initially sold to Institutional
     Accredited   Investors,  the   Securities  will   be   issued  in   minimum
     denominations of U.S.  $250,000 and integral  multiples of  U.S. $1,000  in
     excess  thereof,  but  on  subsequent  transfers,   will  be  available  in
     denominations of U.S. $1,000 and integral multiples thereof.

     SECTION 3.3.  Execution, Authentication, Delivery and Dating.
                   ----------------------------------------------

           The Securities  shall be  executed on  behalf of  the Company by  its
     Chairman of  the Board, one of  its Vice Chairmen  of the Board,  its Chief
     Executive Officer,  its President  or one  of its  Senior Vice  Presidents,

                                        - 42 -
<PAGE>






     under  a facsimile of its corporate seal reproduced thereon attested by its
     Secretary or one of  its Assistant Secretaries.  Any such signature  may be
     manual or facsimile.

           Securities bearing the  manual or facsimile signature of  individuals
     who  were at  any time the  proper officers of  the Company  shall bind the
     Company, notwithstanding that such individuals  or any of them  have ceased
     to hold  such offices  prior to  the authentication  and  delivery of  such
     Securities or did not hold such offices at the date of such Securities.

           At any time  and from time to time  after the execution and  delivery
     of  this Indenture,  the  Company may  deliver  Securities executed  by the
     Company to the Trustee or to its order for authentication, together with  a
     Company Order for the authentication  and delivery of such  Securities, and
     the Trustee  or an  Authenticating Agent  in accordance  with such  Company
     Order shall authenticate  and make available for  delivery such  Securities
     as in this  Indenture provided and not  otherwise.  In connection  with any
     Company  Order for authentication, an  Officers' Certificate and Opinion of
     Counsel pursuant to Section 1.2 shall not be required.

           Each Security shall be dated the date of its authentication.

           No Security shall be entitled  to any benefit under this Indenture or
     be  valid or  obligatory  for any  purpose  unless  there appears  on  such
     Security  a  certificate  of  authentication  substantially   in  the  form
     provided for herein executed  by the Trustee or an Authenticating  Agent by
     manual signature of  an authorized signatory, and such certificate upon any
     Security shall be  conclusive evidence, and  the only  evidence, that  such
     Security has been duly authenticated and delivered hereunder.

     SECTION 3.4.  Global Securities.
                   -----------------

           The Securities shall be issued  initially in the form of a Restricted
     Global  Security or  a Regulation  S Global  Security  (or, if  the initial
     purchasers are  Institutional Accredited  Investors, Definitive  Restricted
     Securities).  The Depositary  or its  nominee shall  be the  Holder of  the
     Global  Securities, and  owners of beneficial  interests in  the Securities
     represented by the  Global Securities shall hold such interests pursuant to
     the  procedures  and  practices  of  the  Depositary.    Any  such  owner's
     beneficial ownership of any such Securities will be  shown only on, and the
     transfer  of  such  ownership  interest  shall  be  effected  only through,
     records  maintained  by  the  Depositary  or  its  nominee.    Transfer  of
     interests in  the Global Securities  shall be subject to  the provisions of
     Section 3.5.    Investors may  hold  their interests  in the  Regulation  S
     Global Security through  CEDEL or Euroclear,  if they  are participants  in
     such systems,  or indirectly through  organizations which are  participants
     in such systems.   After the expiration  of the Restricted Period  (but not
     earlier),  investors may  also hold  such  interests through  organizations
     other than  CEDEL and Euroclear  that are participants  in the Depositary's
     system.   CEDEL  and  Euroclear will  hold  interests in  the Regulation  S
     Global  Security  on  behalf  of  their   participants  through  customers'

                                        - 43 -
<PAGE>






     securities  accounts  in their  respective  names  on  the  books of  their
     respective depositaries,  which, in turn,  will hold such  interests in the
     Regulation  S Global  Security  in customer's  securities  accounts in  the
     depositaries' names on the  books of  the Depositary.   All interests in  a
     Global Security,  including those held  through Euroclear or  CEDEL, may be
     subject to the  procedures and requirements  of DTC.  Those  interests held
     through  Euroclear  and  CEDEL  will  be  subject  to  the  procedures  and
     requirements of such system.

           Unless the  Depository notifies the Company  that it  is unwilling or
     unable to  continue as depository for a  Global Security or ceases  to be a
     "Clearing  Agency"  registered  under the  Exchange  Act  or  announces  an
     intention permanently  to cease  business  or does  in fact  do so,  and  a
     successor Depositary  is not  appointed by the  Company within  90 days  of
     such notice,  or in the  case of a  Global Security held for  an account of
     Euroclear or CEDEL, Euroclear or  CEDEL (as the case may be)  is closed for
     business for  14 continuous  days or  announces an  intention to  cease, or
     permanently ceases,  business, owners  of beneficial interests  in a Global
     Security will not be entitled to have any portions of such Global  Security
     registered  in their  names, will  not receive  or be  entitled to  receive
     physical delivery  of  Securities  in  definitive  form  and  will  not  be
     considered  the owners  or  holders of  the Global  Security.   Any  Global
     Security  exchanged  upon the  occurrence  of  an  event  described in  the
     preceding  sentence shall be  so exchanged in  whole and not  in part.  Any
     Security issued in exchange  for a Global Security  or any portion  thereof
     shall be a Global Security, provided that any  such Security so issued that
     is registered  in the  name of  a Person  other than  the  Depositary or  a
     nominee thereat  shall  not  be  a  Global Security.    In  addition,  upon
     request, the Company  will issue certificates for Securities in definitive,
     fully registered, non-global  form in exchange for beneficial  interests of
     like principal  amount in any Global Note, but  only upon at least 60 days'
     prior  written  notice   given  to  the  Trustee  in  accordance  with  the
     Depositary's customary procedures.

           Securities issued  in exchange for a  Global Security  or any portion
     thereof pursuant  to  the preceding  paragraph  above  shall be  issued  in
     definitive,  fully registered form shall have an aggregate principal amount
     equal  to  that of  such  Global  Security  or  portion thereof  to  be  so
     exchanged, shall  be registered  in such  names and  be in  such authorized
     denominations as the  Depositary shall designate and shall bear any legends
     required hereunder.  Any Global Security to be  exchanged in whole shall be
     surrendered by the Depositary to the Trustee,  as Security Registrar.  With
     regard to any  Global Security to be exchanged  in part, either such Global
     Security shall be so surrendered for exchange or,  if the Trustee is acting
     as custodian for the  Depositary or its nominee with respect to such Global
     Security,  the principal  amount  thereof shall  be  reduced, by  an amount
     equal  to  the  portion  thereof  to  be  so  exchanged,  by  means  of  an
     appropriate adjustment made on the records of  the Trustee.  Upon any  such
     surrender  or adjustment,  the Trustee  shall authenticate  and deliver the
     Security issuable on such  exchange to or upon the order of  the Depositary
     or  an authorized representative thereof.   In the  event of the occurrence
     of  any of  the events specified  in the  preceding paragraph,  the Company

                                        - 44 -
<PAGE>






     will promptly  make  available  to  the  Trustee  a  reasonable  supply  of
     certificated Securities in definitive form.

           Except as otherwise set forth in the Indenture or a Global  Security,
     owners of  beneficial interests  in the  Securities evidenced  by a  Global
     Security  will  not be  entitled  to any  rights under  the  Indenture with
     respect to such  Global Security, and the Depositary  or its nominee may be
     treated by  the Company, the  Trustee and any  agent of the Company  or the
     Trustee as the  owner and Holder of  such Global Security for  all purposes
     whatsoever.   Notwithstanding the foregoing,  nothing herein shall  prevent
     the  Company, the  Trustee or  any such  agent  from giving  effect to  any
     written  certification,  proxy  or other  authorization  furnished  by  the
     Depositary  or its  nominee or  impair, as  between  the Depositary  or its
     nominee  and  such  owners  of  beneficial  interests,  the  operation   of
     customary practices governing  the exercise of the rights of the Depositary
     or its nominee as Holder of any Security.

           Initially, any  and all  Global Securities issued hereunder  shall be
     issued  to the  Depositary, registered in  the name of  Cede &  Co., as the
     nominee of the  Depositary, and deposited  with the  Trustee, as  custodian
     for Cede & Co.

     SECTION 3.5.  Registration,   Registration   of  Transfer   and   Exchange;
                   Restrictions on Transfer.
                   ---------------------------------------------------

           (a) The Company shall cause to be kept  at the Corporate Trust Office
     of the Trustee  a register (the register  maintained in such office  and in
     any  other office or agency  of the Company  designated pursuant to Section
     10.2  being herein  sometimes  collectively referred  to  as the  "Security
     Register")  in which,  subject  to such  reasonable  regulations as  it may
     prescribe, the Company  shall provide  for the  registration of  Securities
     and of transfers of Securities.  The Trustee is hereby  appointed "Security
     Registrar"  for the  purpose of  registering Securities  and  transfers and
     exchanges of Securities as herein provided.

           Upon  surrender for registration  of transfer  of any  Security at an
     office or  agency of  the Company designated  pursuant to Section  10.2 for
     such  purpose,   the  Company   shall  execute,   and  the  Trustee   shall
     authenticate  and deliver,  in  the name  of  the designated  transferee or
     transferees, one or  more new  Securities of  any authorized  denominations
     and  of a  like  aggregate principal  amount  and bearing  such restrictive
     legends as may be required by this Indenture (including Section 2.4).

           At the option of the Holder, and subject  to the other provisions  of
     this Section 3.5, Securities may be  exchanged for other Securities of  any
     authorized denomination  and of  a like  aggregate  principal amount,  upon
     surrender of the Securities to be exchanged  at any such office or  agency.
     Whenever any Securities  are so surrendered  for exchange,  and subject  to
     the other provisions  of this Section  3.5, the Company shall  execute, and
     the  Trustee  shall authenticate  and  deliver,  the  Securities which  the
     Holder making  the  exchange  is  entitled  to  receive.    Every  Security

                                        - 45 -
<PAGE>






     presented  or  surrendered for  registration  of transfer  or  for exchange
     shall (if  so required by  the Company or  the Security Registrar) be  duly
     endorsed, or be  accompanied by a  written instrument of  transfer in  form
     satisfactory to  the Company and  the Security Registrar  duly executed, by
     the Holder thereof or his attorney duly authorized in writing.

           All  Securities issued upon any registration of  transfer or exchange
     of Securities shall  be the valid  obligations of  the Company,  evidencing
     the  same debt, and  subject to the other  provisions of  this Section 3.5,
     entitled  to the  same  benefits under  this  Indenture, as  the Securities
     surrendered upon such registration of transfer or exchange.

           No service charge shall be made for  any registration of transfer  or
     exchange  of Securities,  but  the Company  may  require payment  of  a sum
     sufficient  to cover  any tax  or  other governmental  charge  that may  be
     imposed in  connection with  any registration  of transfer  or exchange  of
     Securities, other than  exchanges pursuant to Section 11.8, 12.2 or 14.2(e)
     (other  than where the  Common Shares  are to be  issued or  delivered in a
     name other  than that  of the  Holder of  the Security)  not involving  any
     transfer and other than  any stamp and other  duties, if any, which may  be
     imposed  in connection  with any such  transfer or exchange  by Canada, the
     United States  or the United  Kingdom or any  political subdivision thereof
     or therein, which shall be paid by the Company.

           In the event of  a redemption of the  Securities in part, neither the
     Company  nor the  Securities  Registrar will  be  required to  register the
     transfer of  or  exchange any  Security,  or  portion thereof,  called  for
     redemption.

           (b) Beneficial  ownership of every Security  shall be  subject to the
     restrictions on transfer provided  in the legends required to be  set forth
     on  the  face  of  each  Security pursuant  to  Section  2.4,  unless  such
     restrictions  on transfer  shall be  waived by  the written  consent of the
     Company, or  terminated in accordance  with this Section  3.5(b) or Section
     3.5(c).  The  Holder of each Security, by such Holder's acceptance thereof,
     agrees to be bound by such restrictions on transfer.

           The  restrictions imposed by  this Section  3.5 and  Section 2.4 upon
     the transferability  of any particular  Security shall cease and  terminate
     upon delivery by  the Company to  the Trustee  of an Officers'  Certificate
     and Opinion of  Counsel stating that such  Security has been  sold pursuant
     to  an  effective  registration  statement  under  the  Securities  Act  or
     transferred in compliance  with Rule 144 under  the Securities Act (or  any
     successor provision  thereto).   Any Restricted  Security as  to which  the
     Company has delivered to the  Trustee an Officers' Certificate  and Opinion
     of  Counsel  that such  restrictions  on  transfer  shall  have expired  in
     accordance with  their terms or  shall have terminated  may, upon surrender
     of such Restricted Security  for exchange to the Security Registrar  or any
     Transfer Agent  in accordance  with the provisions  of this Section  3.5 be
     exchanged  for  a new  Security,  of  like  tenor  and aggregate  principal
     amount, which  shall not bear  the restrictive legends  required by Section
     2.4.   The Company  shall inform  the Trustee  in writing of  the effective

                                        - 46 -
<PAGE>






     date  of any registration  statement registering  the Securities  under the
     Securities  Act.  The Trustee  shall not be liable  for any action taken or
     omitted  to  be  taken   by  it  in  good  faith  in  accordance  with  the
     aforementioned registration statement.

           As used  in the  preceding two  paragraphs of  this Section 3.5,  the
     term  "transfer"   encompasses  any   sale,  pledge,   transfer  or   other
     disposition of any Restricted Security.

           (c) Notwithstanding  any other  provisions of  this Indenture  or the
     Securities, transfers of a Global Security, in whole or in  part, transfers
     and exchanges of interests  therein of the kinds described  in Clauses (2),
     (3),  (4),  (5)  and  (6)  below  and  exchanges  of  interests  in  Global
     Securities or  of other Securities as described in  Clause (7) below, shall
     be made only in accordance with this  Section 3.5(c), and all transfers  of
     an  interest in the Regulation S  Global Security shall comply with Section
     3.5(c)(8)  below.   Transfers  and exchanges  subject  to this  Section 3.5
     shall also be  subject to the other  provisions of this Indenture  that are
     not inconsistent with this Section 3.5.

                  (1)   A Global Security may not be transferred, in whole or in
           part, to any  Person other than the  Depositary or a nominee thereof,
           and  no such  transfer to  any such  other Person  may be registered;
           provided that this  Clause (1) shall not  prohibit any transfer  of a
           Security that is issued  in exchange for a Global Security but is not
           itself a Global  Security.  No transfer of  a Security to any  Person
           shall be effective under this Indenture  or the Securities unless and
           until such Security has  been registered in the  name of such Person.
           Nothing  in   this  Section  3.5(c)(1)   shall  prohibit  or   render
           ineffective  any  transfer  of a  beneficial  interest  in  a  Global
           Security  effected in  accordance with  the other provisions  of this
           Section 3.5(c).

                  (2)    RESTRICTED  GLOBAL  SECURITY  TO  REGULATION  S  GLOBAL
           SECURITY.  If the holder of a  beneficial interest in the  Restricted
           Global Security wishes  at any time  to transfer such  interest to  a
           Person  who  wishes  to take  delivery  thereof  in  the  form  of  a
           beneficial  interest  in  the  Regulation  S  Global  Security,  such
           transfer may be effected,  subject to the rules and procedures of the
           Depositary,   Euroclear  and  CEDEL,  in  each  case  to  the  extent
           applicable  (the "Applicable  Procedures"), only  in  accordance with
           the provisions  of  this Section  3.5(c)(2).    Upon receipt  by  the
           Trustee,  as Security  Registrar, at  its office in  The City  of New
           York  of  (A)  a  written  order  given  by  the  Depositary  or  its
           authorized representative  directing the Trustee  to credit or  cause
           to  be credited to  a specified  Agent Member's  account a beneficial
           interest in  the Regulation S Global  Security in  a principal amount
           equal  to that of  the beneficial  interest in  the Restricted Global
           Security to  be so  transferred, (B)   a  written order given  by the
           Depositary or  its authorized  representative containing  information
           regarding  the account  of the  Agent  Member  (and the  Euroclear or
           CEDEL account,  as the  case may  be) to  be credited  with, and  the

                                        - 47 -
<PAGE>






           account of  the  Agent Member  to  be  debited for,  such  beneficial
           interest and  (C) a certificate in  substantially the  form set forth
           in Annex B-1  given by the  holder of such  beneficial interest,  the
           Trustee,  as Security  Registrar, shall  instruct the  Depositary  to
           reduce the principal  amount of  the Restricted Global Security,  and
           to  increase  the  principal  amount   of  the  Regulation  S  Global
           Security, by the principal amount of  the beneficial interest in  the
           Restricted  Global Security to  be so  transferred, and  to credit or
           cause to be credited to the account of  the Person specified in  such
           instructions (which shall be the Agent  Member for Euroclear or CEDEL
           or both, as the case may be) a beneficial interest in the  Regulation
           S  Global Security having a  principal amount equal  to the amount by
           which  the  principal amount  of the  Restricted Global  Security was
           reduced upon such transfer.

                  (3)   RESTRICTED  SECURITY  TO  UNRESTRICTED  GLOBAL  SECURITY
           AFTER THREE  YEARS.   If the  holder of  a beneficial  interest in  a
           Restricted  Security wishes at  any time  after three  years from the
           latest  of May 7, 1996 or the date of  original issue of any Security
           or  the resale of any Security  by an affiliate of the Company to (i)
           transfer such  interest  to a  Person  who  wishes to  take  delivery
           thereof in  the form  of a  beneficial interest  in the  Unrestricted
           Global Security  or  (ii)  exchange such  interest for  a  beneficial
           interest in an  Unrestricted Global  Security, such  transfer may  be
           effected, subject  to the Applicable  Procedures, only in  accordance
           with  this  Section 3.5(c)(3).    Upon  receipt  by  the Trustee,  as
           Security Registrar,  at its office in The City of New  York of (A) in
           the case of a  transfer or exchange of  an interest in the Restricted
           Global Security, an order given by  the Depositary or its  authorized
           representative  directing  the  Trustee to  credit  or  cause  to  be
           credited  to a specified Agent Member's account a beneficial interest
           in the  Unrestricted Global Security in  a principal  amount equal to
           that of the beneficial interest in  the Restricted Global Security to
           be  so transferred, (B) in the  case of a  transfer or exchange of an
           interest  in the Restricted  Global Security,  an order  given by the
           Depositary or  its authorized  representative containing  information
           regarding the  account of the Agent  Member (and,  if applicable, the
           Euroclear or CEDEL account, as the case may be) to be credited  with,
           and  the  account  of  the  Agent  Member  to be  debited  for,  such
           beneficial  interest and (C)  a certificate in substantially the form
           set  forth in  Annex  C-2 given  by  the  holder  of such  beneficial
           interest, the Trustee, as Security Registrar,  shall (x) in the  case
           of  a transfer  or exchange of  an interest in  the Restricted Global
           Security, instruct the  Depositary to reduce the principal amount  of
           the Restricted  Global Security, and to increase the principal amount
           of the Unrestricted Global Security, by  the principal amount of  the
           beneficial  interest  in the  Restricted  Global  Security  to be  so
           transferred, and to credit or cause to be  credited to the account of
           the  Person specified  in such instructions a  beneficial interest in
           the Unrestricted Global  Security having a  principal amount equal to
           the  amount by which  the principal  amount of  the Restricted Global
           Security was  reduced  upon such  transfer, or  (y)  in  the case  of

                                        - 48 -
<PAGE>






           transfer  or exchange  of a  Definitive Restricted  Security,  cancel
           such  Definitive  Restricted  Security  and  increase  the  principal
           amount of the Unrestricted Global Security accordingly.

                  (4)    REGULATION S  GLOBAL  SECURITY  OR UNRESTRICTED  GLOBAL
           SECURITY  TO  RESTRICTED  GLOBAL  SECURITY.    If  the  holder  of  a
           beneficial  interest  in  the Regulation  S  Global  Security  or the
           Unrestricted  Global Security  wishes at  any time  to transfer  such
           interest to a Person who wishes to take  delivery thereof in the form
           of a  beneficial interest  in  the Restricted  Global Security,  such
           transfer may be effected, subject to  the Applicable Procedures, only
           in  accordance with  this Section  3.4(c)(4).    Upon receipt  by the
           Trustee, as Security  Registrar, at  its office  in The  City of  New
           York  of  (A)  a  written  order  given  by  the  Depositary  or  its
           authorized representative  directing the Trustee  to credit or  cause
           to  be credited to  a specified  Agent Member's  account a beneficial
           interest  in the  Restricted Global  Security in  a principal  amount
           equal to that of the beneficial  interest in the Regulation  S Global
           Security  or the Unrestricted  Global Security  to be so transferred,
           (B)  a  written order  given  by  the  Depositary  or its  authorized
           representative containing  information regarding  the account of  the
           Agent Member  to  be  credited with,  and the  account  of the  Agent
           Member (and,  if applicable, the Euroclear  or CEDEL  account, as the
           case may be)  to be  debited for,  such beneficial  interest and  (C)
           with  respect  to  a  transfer  of   a  beneficial  interest  in  the
           Regulation  S  Global  Security  (but  not  the  Unrestricted  Global
           Security),  a  certificate  in substantially  the form  set  forth in
           Annex B-3  given  by the  holder  of  such beneficial  interest,  the
           Trustee,  as Security  Registrar, shall  instruct the  Depositary  to
           reduce the  principal amount of the  Regulation S  Global Security or
           Unrestricted  Global Security, as  the case  may be,  and to increase
           the  principal  amount  of  the Restricted  Global  Security,  by the
           principal  amount  of the  beneficial  interest  in the  Regulation S
           Global   Security  or   Unrestricted  Global   Security  to   be   so
           transferred, and to credit or cause to be credited to the account  of
           the Person  specified in  such instructions a beneficial  interest in
           the Restricted  Global Security  having a  principal amount  equal to
           the amount  by which the principal  amount of the Regulation S Global
           Security  or Unrestricted Global  Security, as  the case  may be, was
           reduced upon such transfer.

                  (5)  EXCHANGES OF  RESTRICTED GLOBAL SECURITY FOR UNRESTRICTED
           GLOBAL  SECURITY.   If  the holder  of a  beneficial interest  in the
           Restricted  Global Security  wishes  at  any time  to  exchange  such
           interest  for  a  beneficial  interest  in  the  Unrestricted  Global
           Security,  such exchange may  be effected,  subject to the Applicable
           Procedures, only in  accordance with the  provisions of  this Section
           3.5(c)(5).   Upon receipt by the  Trustee, as  Security Registrar, at
           its office  in The City  of New York of (A) a  written order given by
           the  Depositary  or  its  authorized  representative  directing   the
           Trustee  to credit  or cause  to  be  credited to  a specified  Agent
           Member's account  a beneficial  interest in  the Unrestricted  Global

                                        - 49 -
<PAGE>






           Security in  a  principal amount  equal  to  that of  the  beneficial
           interest in the Restricted Global Security to  be so exchanged, (B) a
           written   order  given   by   the  Depositary   or   its   authorized
           representative containing  information regarding  the account  of the
           Agent Member  (and the  Euroclear or CEDEL  account, as the  case may
           be) to be credited  with, and the account of  the Agent Member  to be
           debited  for,  such  beneficial interest  and  (C)  a  certificate in
           substantially the form set  forth in Annex C-1,  given by the  holder
           of  such beneficial  interest, the  Trustee, as  Security  Registrar,
           shall instruct the Depositary to reduce  the principal amount of  the
           Restricted Global Security, and to increase  the principal amount  of
           the  Unrestricted Global  Security by  the  principal amount  of  the
           beneficial  interest  in the  Restricted  Global  Security to  be  so
           exchanged, and to  credit or cause to be  credited to the account  of
           the Person  specified in such  instructions a  beneficial interest in
           the  Unrestricted Global Security having a principal  amount equal to
           the  amount by which  the principal  amount of  the Restricted Global
           Security was reduced upon such exchange.

                  (6) EXCHANGES OF  DEFINITIVE RESTRICTED SECURITIES (ISSUED  IN
           THE INITIAL  DISTRIBUTION TO INSTITUTIONAL  ACCREDITED INVESTORS) FOR
           RESTRICTED  GLOBAL  SECURITY, REGULATION  S  GLOBAL  OR  UNRESTRICTED
           GLOBAL SECURITY. If  the holder  of a Definitive Restricted  Security
           wishes  at  any time  to  exchange  such  interest  for a  beneficial
           interest  in the  Restricted  Global Security,  Regulation  S  Global
           Security, or the  Unrestricted Global Security, such exchange may  be
           effected, subject  to the Applicable  Procedures, only in  accordance
           with the provisions of  this Section 3.5(c)(6).   Upon receipt by the
           Trustee, as  Security Registrar,  at its  office in  The City  of New
           York of  (A)   such  Restricted  Securities  as provided  in  Section
           3.5(a)  and   written  instructions  satisfactory   to  the   Trustee
           directing  the  Trustee  to credit  or  cause  to be  credited  to  a
           specified  Agent  Member's  account  a  beneficial  interest  in  the
           Restricted  Global Security,  Regulation  S Global  Security  or  the
           Unrestricted Global  Security, as  the case  may be,  in a  principal
           amount  equal to that  of the  beneficial interest  in the Definitive
           Restricted Security to be so exchanged, (B) a written order given  by
           the   Depositary   or  its   authorized   representative   containing
           information  regarding the  account  of  the Agent  Member  (and  the
           Euroclear or CEDEL account,  as the case may be) to be credited with,
           and the  account  of  the  Agent  Member  to  be  debited  for,  such
           beneficial interest and (C) a  certificate in substantially  the form
           set  forth  in Annex  B-2, given  by  the holder  of such  Definitive
           Restricted  Security interest,  the  Trustee, as  Security Registrar,
           shall cancel  such Definitive  Restricted Security  (and issue a  new
           Definitive  Restricted  Security  in  respect  of  any  untransferred
           portion  thereof)  and  instruct  the  Depositary  to  increase   the
           principal  amount of  the Restricted  Global Security,  Regulation  S
           Global Security or the Unrestricted Global  Security, as the case may
           be,  by  the principal  amount  of  the  beneficial  interest in  the
           Definitive Restricted Security to be so  exchanged, and to credit  or
           cause to be credited  to the account of  the Person specified in such

                                        - 50 -
<PAGE>






           instructions (which shall be the Agent  Member for Euroclear or CEDEL
           or both,  as the  case may  be, if  an interest in  the Regulation  S
           Global  Security is  being credited)  a  beneficial interest  in  the
           Regulation  S Global Security  or the Unrestricted Global Security or
           the  Restricted  Global  Security,  as  the  case  may  be,  having a
           principal amount  equal to the amount  by which  the principal amount
           of the Definitive Restricted Security was exchanged.

                  (7)   OTHER EXCHANGES.  In the event that a Global Security or
           any portion  thereof is  exchanged for  Securities other  than Global
           Securities,  such  other Securities  may  in  turn  be exchanged  (on
           transfer or otherwise) for Securities that are not Global  Securities
           or for beneficial  interests in  a Global  Security (if  any is  then
           outstanding) only in  accordance with such procedures, which shall be
           substantially consistent with  the provisions of Clauses (1)  through
           (6) above  and (8)  below (including  the certification  requirements
           intended  to  insure  that  transfers  and  exchanges  of  beneficial
           interests in a  Global Security comply  with Rule  144A, Rule 144  or
           Regulation  S, as the case may be) and  any Applicable Procedures, as
           may be from time to time adopted by the Company and the Trustee.

                  (8)   INTERESTS  IN REGULATION  S GLOBAL  SECURITY TO  BE HELD
           THROUGH  EUROCLEAR  OR  CEDEL.       Until  the  termination  of  the
           Restricted Period, interests in the  Regulation S Global Security may
           be  held only  through  Agent Members  acting for  and  on  behalf of
           Euroclear  and  CEDEL,  provided  that  this  Clause  (8)  shall  not
           prohibit any transfer in accordance with Section 3.5(c)(4) hereof.

                  (d)  Neither  the Trustee, the Paying Agent in  London nor any
     of their agents shall (1) have any duty to  monitor compliance with or with
     respect to any  Canadian, U.S. federal or state  or other securities or tax
     laws or  (2) have  any duty  to obtain  documentation on  any transfers  or
     exchanges other than as specifically required hereunder.

     SECTION 3.6.  Mutilated, Destroyed, Lost or Stolen Securities.
                   -----------------------------------------------

           If any  mutilated  Security is  surrendered to  the Trustee  or to  a
     Transfer Agent  outside the United  States, the Company  shall execute, the
     Trustee or  an Authenticating Agent  shall authenticate and  the Trustee or
     Transfer Agent shall  deliver in exchange therefor  a new Security  of like
     tenor and  principal  amount and  bearing  a number  not  contemporaneously
     outstanding.

           If there be delivered to the Company and either  to the Trustee or to
     a Transfer Agent outside the United States:

                  (1)  evidence  to their satisfaction of  the destruction, loss
           or theft of any Security, and




                                        - 51 -
<PAGE>






                  (2)  such security or indemnity as may be satisfactory  to the
           Company and the Trustee and such Transfer Agent to save each of  them
           and any agent of either of them harmless,

     then, in the  absence of actual notice  to the Company, the  Trustee or the
     Transfer Agent  that  such  Security  has  been acquired  by  a  bona  fide
     purchaser,  the Company  shall execute,  the Trustee  or  an Authenticating
     Agent shall authenticate and the  Trustee or Transfer Agent  shall deliver,
     in lieu  of any such destroyed, lost or stolen  Security, a new Security of
     like tenor and  principal amount and bearing a number not contemporaneously
     outstanding.

           In case  any such mutilated, destroyed,  lost or  stolen Security has
     become  or  is  about  to become  due  and  payable,  the  Company  in  its
     discretion, but subject to any  conversion rights, may instead,  of issuing
     a  new Security, pay such Security  upon satisfaction of the conditions set
     forth in the preceding paragraph.

           Upon the  issuance of any  new Security under  this Section  3.6, the
     Company may require  the payment of a  sum sufficient to  cover any tax  or
     other governmental  charge that may  be imposed in  relation thereto (other
     than  any  stamp  and  other  duties,  if  any,  which may  be  imposed  in
     connection  therewith by Canada, the United States or the United Kingdom or
     any political  subdivision thereof or therein,  which shall be  paid by the
     Company) and any  other expenses (including  the fees and  expenses of  the
     Trustee,  the Paying  Agent  in London  and  the Transfer  Agent) connected
     therewith.

           Every new Security  issued pursuant to  this Section  3.6 in lieu  of
     any  mutilated,  destroyed, lost  or  stolen  Security shall  evidence  the
     original  contractual  obligation  of  the  Company,  whether  or  not  the
     mutilated, destroyed,  lost  or  stolen  Security  shall  be  at  any  time
     enforceable by anyone, and such new Security  shall be entitled to all  the
     benefits of this  Indenture equally and  proportionately with  any and  all
     other Securities duly issued hereunder.

           The provisions of this Section 3.6  are exclusive and shall  preclude
     (to the  extent lawful) all  other rights and  remedies of any Holder  with
     respect to  the replacement  or payment  of mutilated,  destroyed, lost  or
     stolen Securities.

     SECTION 3.7.  Payment of Interest, Interest Rights Preserved.
                   ----------------------------------------------

           Interest on any Security which  is payable, and is punctually paid or
     duly provided  for, on  any  Interest Payment  Date shall  be paid  to  the
     Person in whose name that  Security (or one or more Predecessor Securities)
     is registered at the close of business  on the Regular Record Date for such
     interest.

           Any interest on any Security which  is payable, but is not punctually
     paid  or duly  provided for, on  any Interest  Payment Date  (herein called

                                        - 52 -
<PAGE>






     "Defaulted  Interest") shall forthwith cease to be payable to the Holder on
     the relevant Regular Record Date by virtue of  having been such Holder, and
     such Defaulted Interest  may be  paid by the  Company, at  its election  in
     each case, as provided in Clause (1) or (2) below:

                  (1)   The Company may elect  to make payment of  any Defaulted
           Interest  to the  Persons in  whose  names  the Securities  (or their
           respective Predecessor  Securities) are  registered at  the close  of
           business on a Special  Record Date for the payment of such  Defaulted
           Interest,  which shall be fixed in the following manner.  The Company
           shall notify  the  Trustee in  writing  of  the amount  of  Defaulted
           Interest proposed  to be  paid  on  each Security,  the date  of  the
           proposed payment and  the Special Record Date,  and at the  same time
           the Company  shall deposit with the Trustee an amount  of money equal
           to  the aggregate  amount proposed  to  be paid  in respect  of  such
           Defaulted Interest  or shall  make arrangements  satisfactory to  the
           Trustee for such deposit  prior to the date  of the proposed payment,
           such money when deposited  to be held in trust for the benefit of the
           Persons  entitled  to  such  Defaulted  Interest  as  in this  Clause
           provided.  The Special Record Date for the payment of such  Defaulted
           Interest shall be  not more than  15 days  and not less than  10 days
           prior to the  date of the proposed payment and not less  than 10 days
           after the  receipt by  the  Trustee  of the  notice of  the  proposed
           payment.   The  Trustee,  in the  name  and  at  the expense  of  the
           Company,  shall  cause  notice  of  the  proposed   payment  of  such
           Defaulted  Interest  and  the Special  Record  Date  therefor  to  be
           mailed, first-class  postage prepaid, to each Holder of Securities at
           such  Holder's address as  it appears  in the  Security Register, not
           less than 10 days prior to such  Special Record Date.  Notice  of the
           proposed payment  of such Defaulted Interest  and the Special  Record
           Date  therefor having  been so mailed, such  Defaulted Interest shall
           be  paid  to the  Persons in  whose  names the  Securities (or  their
           respective Predecessor  Securities) are  registered at  the close  of
           business on such Special Record  Date and shall no  longer be payable
           pursuant to the following Clause (2).

                  (2)   The Company  may make payment of  any Defaulted Interest
           in any other lawful manner not  inconsistent with the requirements of
           any securities  exchange on which the  Securities may  be listed, and
           upon such  notice as  may be  required  by such  exchange, if,  after
           notice given by the  Company to the Trustee  of the proposed  payment
           pursuant  to this  Clause, such  manner  of  payment shall  be deemed
           practicable by the Trustee.

           Subject to the foregoing provisions of  this Section and Section 3.5,
     each  Security delivered under this Indenture upon registration of transfer
     of or  in exchange for  or in lieu  of any  other Security shall  carry the
     rights to  interest accrued and unpaid,  and to accrue, which  were carried
     by such other Security.

           In the  case of  any Security  which is  converted after  any Regular
     Record Date and  on or prior to  the next succeeding Interest  Payment Date

                                        - 53 -
<PAGE>






     (other than any Security  whose Maturity is prior to  such Interest Payment
     Date), interest  whose Stated  Maturity is  on such  Interest Payment  Date
     shall  be  payable  on such  Interest  Payment  Date  notwithstanding  such
     conversion,  and such  interest  (whether or  not  punctually paid  or duly
     provided for)  shall be paid to the Person  in whose name such Security (or
     one or more Predecessor Securities) is registered at the close of  business
     on such Regular  Record Date.   Except as  otherwise expressly provided  in
     the immediately preceding  sentence, in the case  of any Security  which is
     converted, interest whose Stated Maturity  is after the date  of conversion
     of such Security shall not be payable.

     SECTION 3.8.  Persons Deemed Owners.
                   ---------------------

           Prior to due presentment of a  Security for registration of transfer,
     the  Company, the Trustee and any  agent of the Company  or the Trustee may
     treat the Person in whose name such Security is  registered as the owner of
     such  Security  for the  purpose  of  receiving  payment  of principal  of,
     premium, if  any, and (subject  to Section 3.7)  interest on  such Security
     and for  all other  purposes whatsoever,  whether or not  such Security  be
     overdue, and neither the  Company, the Trustee nor any agent of the Company
     or the Trustee shall be affected by notice to the contrary.

     SECTION 3.9.  Cancellation.
                   ------------

           All  Securities  surrendered  for  payment,  redemption,  repurchase,
     registration of transfer or  exchange or  conversion shall, if  surrendered
     to any Person  other than the  Trustee, be delivered  to the Trustee.   All
     Securities so delivered  to the Trustee shall  be canceled promptly  by the
     Trustee.  No  Securities shall be authenticated  in lieu of or  in exchange
     for any Securities canceled  as provided in this Section 3.9.   The Trustee
     shall destroy  all canceled Securities  in accordance  with applicable  law
     and its customary practices in effect from time to time.

     SECTION 3.10.  Computation of Interest.
                    -----------------------

           Interest  on the  Securities  shall  be computed  on the  basis  of a
     360-day year of twelve 30-day months.

     SECTION 3.11.  CUSIP and ISIN Numbers.
                    ----------------------

           The Company in issuing Securities shall  use "CUSIP" numbers (if then
     generally in  use) in addition  to serial  numbers and  "ISIN" numbers  (if
     generally in  use); if so,  the Trustee shall  use such "CUSIP" and  "ISIN"
     numbers in  addition  to  serial  numbers  in  notices  of  redemption  and
     repurchase  as a convenience to Holders;  provided that any such notice may
     state that no  representation is made as  to the correctness of  such CUSIP
     and  ISIN numbers either  as printed on the  Securities or  as contained in
     any notice of  a redemption or repurchase  and that reliance may  be placed

                                        - 54 -
<PAGE>






     only  on  the  serial  or  other  identification  numbers  printed  on  the
     Securities, and any  such redemption or repurchase shall not be affected by
     any defect in or omission of such CUSIP or ISIN numbers.

     SECTION 3.12.  Notification of Withholding.
                    ---------------------------

           The Company shall notify the Trustee in writing  of the necessity, if
     any, to withhold  any amounts from payments  to Holders (and the  amount of
     any  such  withholding)  arising from  the  delivery  by  a Holder  of  any
     certificate.

                                     ARTICLE FOUR

                              SATISFACTION AND DISCHARGE

     SECTION 4.1.  Satisfaction and Discharge of Indenture.
                   ---------------------------------------

           This Indenture  shall upon  Company Request  cease to  be of  further
     effect (except  as to any  surviving rights of  conversion, or registration
     of  transfer  or exchange,  or replacement  of Securities  herein expressly
     provided for  and  any right  to  receive  Additional Amounts  and  Special
     Interest as provided  in the forms of  Securities set forth in  Section 2.2
     and the Company's obligations to  the Trustee pursuant to Section 6.7), and
     the  Trustee,  at   the  expense  of  the  Company,  shall  execute  proper
     instruments   in  form   and   substance   satisfactory  to   the   Trustee
     acknowledging satisfaction and discharge of this Indenture, when

                  (l) either

                  (A)  all Securities  theretofore  authenticated  and delivered
           (other than (i) Securities which have  been destroyed, lost or stolen
           and which have been  replaced or paid as provided in Section 3.6, and
           (ii)  Securities  for  whose  payment  money  has  theretofore   been
           deposited in trust  or segregated and  held in trust  by the  Company
           and thereafter repaid to the Company  or discharged from such  trust,
           as provided  in Section 10.3) have  been delivered to the Trustee for
           cancellation; or

                  (B)  all  such Securities  not  theretofore  delivered to  the
           Trustee or the Paying  Agent in London or its agent for  cancellation
           (other  than Securities referred to in clauses (i) and (ii) of clause
           (1)(A) above)

                   (i) have become due and payable, or

                   (ii)  will  have  become due  and  payable  at  their  Stated
                  Maturity within one year, or

                   (iii) are to be called  for redemption within one  year under
                  arrangements satisfactory  to the Trustee for the giving of by

                                        - 55 -
<PAGE>






                  the Trustee  in the name, and at the  expense, of the Company,
                  and the Company, in the  case of clause (i) or (ii) above, has
                  deposited  or caused to be deposited with the Trustee as trust
                  funds (immediately available  to the  Holders in  the case  of
                  clause (i)) in  trust for the purpose an amount  sufficient to
                  pay and  discharge the entire indebtedness  on such Securities
                  not  theretofore delivered  to the  Trustee for  cancellation,
                  for principal,  premium, if  any, and interest  (including any
                  applicable  Additional  Amounts and  Special Interest)  to the
                  date of  such deposit (in  the case of  Securities which  have
                  become   due  and  payable)  or  to  the  Stated  Maturity  or
                  Redemption Date, as the case may be;

                  (2) the Company  has paid or caused to be  paid all other sums
           payable hereunder by the Company; and

                  (3)  the Company  has delivered  to the  Trustee  an Officers'
           Certificate  and  an  Opinion  of  Counsel,  each  stating  that  all
           conditions   precedent   herein   provided  for   relating   to   the
           satisfaction  and discharge  of  this Indenture  have  been  complied
           with.

     Notwithstanding  the satisfaction  and  discharge  of this  Indenture,  the
     obligations  of  the   Company  to  the  Trustee  under  Section  6.7,  the
     obligations of the  Company to any Authenticating Agent under Section 6.12,
     the  obligation of  the Company  to pay  Additional Amounts  and, if  money
     shall have  been deposited  with the Trustee  pursuant to clause  (1)(B) of
     this Section 4.1, the obligations of the Trustee under Section 4.2 and  the
     last  paragraph  of Section  10.3  shall  survive.    Funds held  in  trust
     pursuant to this Section 4.1 are not  subject to the provisions of  Article
     Thirteen.

     SECTION 4.2.  Application of Trust Money.
                   --------------------------

           Subject to the provisions of the last paragraph of  Section 10.3, all
     money deposited with  the Trustee pursuant to Section  4.1 shall be held in
     trust  and  applied  by  it,  in  accordance with  the  provisions  of  the
     Securities and this Indenture, to  the payment, either directly  or through
     any  Paying Agent (including the  Company acting as  its own Paying Agent),
     to the  Persons entitled thereto,  of the principal,  premium, if  any, and
     interest for whose payment such money has been deposited with the Trustee.

           All moneys  deposited with the Trustee  pursuant to  Section 4.1 (and
     held by it or  any Paying Agent) for the payment of Securities subsequently
     converted shall be returned to the Company upon Company Request.







                                        - 56 -
<PAGE>






                                     ARTICLE FIVE

                                       REMEDIES

     SECTION 5.1.  Events of Default.
                   -----------------

           "Event of  Default",  wherever used  herein,  means  any one  of  the
     following  events  (whatever the  reason  for  such  Event  of Default  and
     whether it shall be occasioned by the provisions of Article Thirteen or  be
     voluntary or involuntary or be effected by operation  of law or pursuant to
     any judgment,  decree  or  order  of  any  court  or  any  order,  rule  or
     regulation of any administrative or governmental body):

                  (1)  default in  the  payment of  any interest  (including any
           Additional Amounts  or Special Interest)  upon any  Security when  it
           becomes due  and  payable, and  continuance  of  such default  for  a
           period of 30 days; or

                  (2) default in the payment  of the principal of or premium, if
           any,  on  any  Security whether  at  its  Maturity  upon  redemption,
           repurchase, or otherwise; or

                  (3) failure to  observe or perform any covenant,  condition or
           agreement on  the part of  the Company  to be  observed or  performed
           pursuant to Sections 7.1 and 10.4 and Article Fourteen hereof; or

                  (4)  default  in the  performance,  or  breach, of  any  other
           covenant or warranty of the Company  in this Indenture (other  than a
           covenant or warranty a default in the performance  or breach of which
           is  specifically   dealt  with  elsewhere   in  this  Section),   and
           continuance of such default  or breach for a period of 60 days  after
           there  has  been given,  by  registered  or  certified  mail, to  the
           Company by  the Trustee  or to  the Company  and the  Trustee by  the
           Holders of  at  least 25%  in  principal  amount of  the  Outstanding
           Securities a  written notice  specifying such  default or breach  and
           requiring  it to  be  remedied and  stating  that such  notice  is  a
           "Notice of Default" hereunder; or

                  (5)  default by  the  Company or  any  Subsidiary (i)  in  the
           payment of  any principal  of or  interest on  any Indebtedness,  the
           principal amount of which, individually  or in the aggregate, exceeds
           U.S.  $10,000,000, when  due after  giving effect  to  any applicable
           grace periods (whether such Indebtedness exists  as of the Issue Date
           or is thereafter created) or (ii)  on any Indebtedness, the principal
           amount  of which,  individually  or  in the  aggregate, exceeds  U.S.
           $10,000,000,  which default or  defaults in  the case  of clause (ii)
           shall have  resulted in  such Indebtedness becoming  due and  payable
           prior  to the date  on which  it would otherwise have  become due and
           payable; or



                                        - 57 -
<PAGE>






                  (6) failure  by the Company or any of  its Subsidiaries to pay
           a final judgment or final judgments or a final order or final  orders
           entered  by  a  court or  courts  of  competent  jurisdiction,  which
           judgments  or orders  in the  aggregate exceed U.S.  $10,000,000, and
           either  (i)  the  commencement  by any  creditor  of  any enforcement
           proceeding upon any such  judgment or order or  (ii) such judgment or
           order remaining unstayed for 45 days; or

                  (7) (A)  a  court  of competent  jurisdiction  shall  enter  a
           decree or order  for relief in respect of  the Company, or any of its
           Significant  Subsidiaries  in   any    involuntary  case  under   any
           Bankruptcy  Law or  any applicable  bankruptcy, insolvency  or  other
           similar law now or  hereafter in effect, which decree or order is not
           stayed; or  any  other similar  relief  shall  be granted  under  any
           applicable federal  or state law; (B) a decree or order of a court of
           competent  jurisdiction   for   the   appointment  of   a   receiver,
           liquidator, sequestrator, trustee, Custodian or other officer  having
           similar  powers   over  the   Company  or  any  of   its  Significant
           Subsidiaries, or over all  of or a  substantial part of its or  their
           respective properties,  shall have been  entered; or the  involuntary
           appointment of  an interim  receiver, trustee or  other Custodian  of
           the  Company or  any  of its  Significant Subsidiaries  for all  or a
           substantial  part  of  its  or their  respective  properties;  or the
           issuance of a  warrant of  attachment, execution  or similar  process
           against  any substantial part of  the property of the  Company or any
           of  its Significant  Subsidiaries and  the  continuance of  any  such
           events in subpart (B) for 45 days unless stayed or discharged; or

                  (8)  the Company  or any  of its Significant  Subsidiaries (A)
           shall  have  an  order for  relief  entered  with  respect  to  it or
           commences   a  voluntary  case   under  any  Bankruptcy  Law  or  any
           applicable  bankruptcy,  insolvency  or  other  similar  law  now  or
           hereafter in effect; (B) shall consent to the  entry of an order  for
           relief  in  an  involuntary  case,  or   to  the  conversion  to   an
           involuntary case,  under  any such  law;  (C)  shall consent  to  the
           appointment of or taking possession by  a receiver, trustee or  other
           Custodian for all  or a substantial part  of its property; (D)  shall
           have made  a general  assignment for  the benefit of  creditors of  a
           substantial part of its  or their assets; (E)  shall admit in writing
           of its inability to pay  its debts as such debts  become due; or  (F)
           the Board  of Directors  of the  Company (or  any committee  thereof)
           adopts  any  resolution which  has  not  been rescinded  or otherwise
           authorizes or approves any of the foregoing; or

                  (9)  any order, judgment  or decree  shall be  entered against
           the Company decreeing the  dissolution or liquidation  of the Company
           and such  order,  judgment or  decree  shall  remain undischarged  or
           unstayed for a period in excess of 30 days; or

                  (10) the  occurrence of a  Change of  Control; provided,  that
           such Event of Default will be cured after  a Change of Control  Offer
           is made and all  Securities properly tendered  for purchase  pursuant

                                        - 58 -
<PAGE>






           to such  Change of Control  Offer are  accepted for payment  and such
           payment  provided  in  the  Change  of  Control  Offer  is  made,  as
           described in Article Fourteen.

           The term  "Bankruptcy Law" means  Title 11, U.S. Code  or any similar
     federal  or state  law  for the  relief of  debtors  or the  Bankruptcy Act
     (Canada),  the Companies  Creditor Arrangement  Act (Canada)  or  any other
     Canadian federal  or provincial law  or the law  of any  other jurisdiction
     relating  to  the relief  of  debtors.    The term  "Custodian"  means  any
     receiver, trustee,  assignee, liquidator, sequestrator or  similar official
     under any Bankruptcy Law.

     SECTION 5.2.  Acceleration of Maturity; Rescission and Annulment.
                   --------------------------------------------------

           If an Event of  Default, other than  an Event  of Default set out  in
     subsection 5.1 (10), occurs and is continuing, then  in every such case the
     Trustee  or the Holders  of not  less than 25%  in principal  amount of the
     Outstanding Securities may declare the  principal of all the  Securities to
     be due and payable immediately, by a notice in writing  to the Company (and
     to the Trustee  if given  by the Holders),  and upon  any such  declaration
     such  principal and  all accrued interest  thereon shall become immediately
     due and payable.

           At any time after such declaration of acceleration has  been made and
     before  a judgment or decree for payment of the money due has been obtained
     by  the Trustee as  hereinafter in this Article  Five provided, the Holders
     of  a  majority in  principal  amount  of  the  Outstanding Securities,  by
     written notice to the  Company and the Trustee, may rescind and  annul such
     declaration and its consequences if

                  (1) the Company has  paid or deposited with the  Trustee a sum
           sufficient to pay

                              (A) all overdue interest on all Securities,

                              (B) the principal of  and premium, if  any, on any
                   Securities  which have  become  due  otherwise than  by  such
                   declaration of acceleration  and any interest thereon  at the
                   rate borne by the Securities,

                              (C) to  the extent that  payment of such  interest
                   is lawful, interest  upon overdue interest at a rate of 6.50%
                   per annum, and

                              (D)  all sums  paid  or  advanced by  the  Trustee
                   hereunder   and   the  reasonable   compensation,   expenses,
                   disbursements and  advances of  the Trustee,  its agents  and
                   counsel; and

                  (2)  all Events of  Default, other than the  nonpayment of the
           principal of, and any interest on,  Securities which have become  due

                                        - 59 -
<PAGE>






           solely by  such  declaration  of  acceleration, have  been  cured  or
           waived as provided in Section 5.13.

           No  rescission  or  annulment  referred to  above  shall  affect  any
     subsequent default or impair any right consequent thereon.

     SECTION 5.3.  Collection  of  Indebtedness  and  Suits for  Enforcement  by
                   Trustee.
                   -------------------------------------------------------

           The Company covenants that if

                  (1)  default is made in the payment of any interest (including
           any Additional Amounts and Special Interest)  on any Security when it
           becomes due and  payable and such default  continues for a period  of
           30 days, or

                  (2)  default is  made in  the payment of  the principal  of or
           premium, if any, on any Security at the Maturity thereof,

     the Company will, upon demand  of the Trustee, pay  to it, for the  benefit
     of the Holders  of such Securities, the  whole amount then due  and payable
     on such Securities  for principal  and interest  (including any  Additional
     Amounts and Special  Interest) and interest  on any  overdue principal  and
     premium, if  any, and  on any  overdue interest  (including any  Additional
     Amounts  and Special Interest), at a rate of 6.50% per annum, to the extent
     permissible  by  applicable  law,  and in  addition  thereto,  such further
     amount  as  shall  be  sufficient  to  cover  the  costs  and  expenses  of
     collection, including the reasonable  compensation, expenses, disbursements
     and advances of the Trustee, its agents and counsel.

           If  the Company fails to pay such amounts forthwith upon such demand,
     the  Trustee,  in its  own name  and as  trustee of  an express  trust, may
     institute a judicial  proceeding for the collection of  the sums so due and
     unpaid, may prosecute such proceeding to  judgment or final decree and  may
     enforce the  same  against  the  Company or  any  other  obligor  upon  the
     Securities and collect the moneys adjudged or decreed to be payable in  the
     manner provided  by law out  of the  property of the  Company or any  other
     obligor upon the Securities, wherever situated.

           If an  Event of  Default, other than an  Event of Default set  out in
     subsection 5.1(10),  occurs  and is  continuing,  the  Trustee may  in  its
     discretion proceed to protect and enforce its rights and the rights of  the
     Holders  of Securities  by  such appropriate  judicial  proceedings as  the
     Trustee shall deem most  effectual to protect and enforce  any such rights,
     whether for the specific enforcement of  any covenant or agreement in  this
     Indenture or in  aid of the  exercise of  any power granted  herein, or  to
     enforce any other proper remedy.





                                        - 60 -
<PAGE>






     SECTION 5.4.  Trustee May File Proofs of Claim.
                   --------------------------------

           In   case  of   the  pendency   of  any   receivership,   insolvency,
     liquidation,   bankruptcy,    reorganization,   arrangement,    adjustment,
     composition or other  judicial proceeding relative  to the  Company or  any
     other  obligor upon the  Securities or  the property  of the Company  or of
     such other  obligor or the  creditors of either,  the Trustee (irrespective
     of whether  the principal  of, and  any interest on,  the Securities  shall
     then  be  due  and  payable  as therein  expressed  or  by  declaration  or
     otherwise  and irrespective  of  whether the  Trustee  shall have  made any
     demand on  the Company for  the payment  of overdue principal  or interest)
     shall be  entitled and  empowered, by  intervention in  such proceeding  or
     otherwise,

                  (1) to  file  and  prove  a claim  for  the  whole  amount  of
           principal, premium, if any, and interest  owing and unpaid in respect
           of   the  Securities   and  take   such  other   actions,   including
           participating  as a  member,  voting  or otherwise,  of any  official
           committee  of creditors appointed  in such  matter, and  to file such
           other papers or documents, in each of the  foregoing cases, as may be
           necessary or advisable  in order  to have the  claims of the  Trustee
           (including  any  claim  for  the  reasonable compensation,  expenses,
           disbursements and  advances of the  Trustee, its  agents and counsel)
           and  of  the  Holders   of  Securities  allowed   in  such   judicial
           proceeding, and

                  (2)  to  collect and  receive  any  moneys or  other  property
           payable or deliverable on any such claim and to distribute the same;

     and any  custodian, receiver,  assignee, trustee, liquidator,  sequestrator
     or  other  similar official  in  any  such  judicial  proceeding is  hereby
     authorized  by each  Holder  of Securities  to make  such  payments to  the
     Trustee and, in the  event that the Trustee shall consent  to the making of
     such payments directly to the Holders of Securities,  to pay to the Trustee
     any  amount   due  to   it  for  the   reasonable  compensation,  expenses,
     disbursements and advances of  the Trustee, its agents and counsel  and any
     other amounts due the Trustee under Section 6.7.

           Nothing herein contained shall be deemed  to authorize the Trustee to
     authorize or consent to  or accept or adopt  on behalf of  any Holder of  a
     Security   any   plan   of  reorganization,   arrangement,   adjustment  or
     composition affecting  the Securities or  the rights of  any Holder thereof
     or to authorize the Trustee to vote in  respect of the claim of any  Holder
     of a Security in  any such proceeding; provided, however,  that the Trustee
     may,  on behalf  of such  Holders, vote  for the  election of a  trustee in
     bankruptcy or similar official.






                                        - 61 -
<PAGE>






     SECTION 5.5.  Trustee May Enforce Claims Without Possession of Securities.
                   -----------------------------------------------------------

           All  rights  of  action  and  claims  under  this  Indenture  or  the
     Securities may  be  prosecuted and  enforced  by  the Trustee  without  the
     possession  of  any of  the  Securities or  the production  thereof  in any
     proceeding  relating thereto,  and any  such proceeding  instituted  by the
     Trustee shall be brought in  its own name as  trustee of an express  trust,
     and any recovery of  judgment shall, after provision for the payment of the
     reasonable  compensation,  expenses,  disbursements  and  advances  of  the
     Trustee, its agents and counsel, be for the  ratable benefit of the Holders
     of the Securities in respect of which judgment has been recovered.

     SECTION 5.6.  Application of Money Collected.
                   ------------------------------

           Subject  to Article  Thirteen, any  money  collected by  the  Trustee
     pursuant to this Article Five shall be  applied in the following order,  at
     the date or  dates fixed by the Trustee and, in case of the distribution of
     such money  on account  of principal,  premium, if any,  or interest,  upon
     presentation of the Securities, and the notation thereon  of the payment if
     only partially paid and upon surrender thereof if fully paid:

                  FIRST:   To the payment  of all amounts due  the Trustee under
           Section 6.7;

                  SECOND:   To the  payment of  the amounts then  due and unpaid
           for principal,  premium, if  any, or  interest on  the Securities  in
           respect of  which or  for the benefit  of which such  money has  been
           collected,  ratably, without  preference  or priority  of  any  kind,
           according  to the  amounts due  and  payable  on such  Securities for
           principal, premium, if any, and interest, respectively; and

                  THIRD: Any remaining amounts shall be repaid to the Company.

     SECTION 5.7.  Limitation on Suits.
                   -------------------

           No Holder  of any  Security  shall have  any right  to institute  any
     proceeding, judicial or otherwise, with  respect to this Indenture,  or for
     the  appointment of  a  receiver  or  trustee,  or  for  any  other  remedy
     hereunder, unless:

                  (1) such  Holder has  previously given  written notice  to the
           Trustee of a continuing Event of Default;

                  (2) the Holders of  not less than  25% in principal amount  of
           the Outstanding  Securities shall  have made written  request to  the
           Trustee to institute proceedings in respect  of such Event of Default
           in its own name as Trustee hereunder;



                                        - 62 -
<PAGE>






                  (3) such  Holder  or  Holders  have  offered  to  the  Trustee
           reasonable indemnity against  the costs, expenses and liabilities  to
           be incurred in compliance with such request;

                  (4) the Trustee for 60 days after  its receipt of such notice,
           request  and offer  of indemnity  has  failed  to institute  any such
           proceeding; and

                  (5) no  direction inconsistent  with such written  request has
           been  given to the  Trustee during such 60-day  period by the Holders
           of a majority in principal amount of the Outstanding Securities;

     it  being understood and intended that no one or more of such Holders shall
     have any right in any manner whatever by virtue of, or  by availing of, any
     provision of this Indenture  to affect, disturb or prejudice the  rights of
     any other  of such Holders,  or to  obtain or  seek to  obtain priority  or
     preference over  any other of  such Holders or  to enforce any right  under
     this Indenture, except in  the manner herein provided and for the equal and
     ratable benefit of all such Holders.

     SECTION 5.8.  Unconditional Right of Holders to Receive Principal,  Premium
                   and Interest and to Convert.
                   ------------------------------------------------------------

           Notwithstanding any other provision in this Indenture,  the Holder of
     any Security shall have the right, which  is absolute and unconditional, to
     receive payment  of  the principal  of, premium,  if any,  and (subject  to
     Section 3.7) interest  on such Security (or,  in the case of  redemption or
     repurchase,  on the Redemption  Date or  Repurchase Date,  as the  case may
     be), and to  convert such Security in  accordance with Article  Twelve, and
     to  institute suit for  the enforcement  of any  such payment and  right to
     convert, and such rights shall not be impaired  without the consent of such
     Holder.

     SECTION 5.9.  Restoration of Rights and Remedies.
                   ----------------------------------

           If  the  Trustee  or any  Holder  of a  Security  has instituted  any
     proceeding  to enforce any  right or  remedy under this  Indenture and such
     proceeding has been discontinued or  abandoned for any reason, or  has been
     determined adversely to  the Trustee or to  such Holder, then and  in every
     such case,  subject to any  determination in such  proceeding, the Company,
     the Trustee and the Holders  of Securities shall be restored severally  and
     respectively to their former positions hereunder  and thereafter all rights
     and remedies of  the Trustee and such  Holders shall continue as  though no
     such proceeding had been instituted.

     SECTION 5.10.  Rights and Remedies Cumulative.
                    ------------------------------

           Except  as  otherwise provided  with  respect  to the  replacement or
     payment of  mutilated, destroyed,  lost or  stolen Securities  in the  last

                                        - 63 -
<PAGE>






     paragraph  of Section  3.6, no  right  or remedy  herein conferred  upon or
     reserved to the Trustee or to  the Holders of Securities is intended to  be
     exclusive of any other right or remedy,  and every right and remedy  shall,
     to  the extent permitted  by law,  be cumulative  and in addition  to every
     other right and remedy given hereunder or now  or hereafter existing at law
     or in  equity or otherwise.   The assertion  or employment of  any right or
     remedy hereunder, or otherwise,  shall not prevent the concurrent assertion
     or employment of any other appropriate right or remedy.

     SECTION 5.11.  Delay or Omission Not Waiver.
                    ----------------------------

           No delay or omission of  the Trustee or of any Holder of any Security
     to exercise any  right or remedy accruing  upon any Event of  Default shall
     impair  any such right or  remedy or constitute a  waiver of any such Event
     of Default or  any acquiescence therein.   Every right and remedy  given by
     this Article Five or by law to the Trustee  or to the Holders of Securities
     may  be exercised  from  time  to  time, and  as  often  as may  be  deemed
     expedient, by the Trustee  or (subject to the limitations contained in this
     Indenture) by the Holders of Securities, as the case may be.

     SECTION 5.12.  Control by Holders of Securities.
                    --------------------------------

           The Holders  of a  majority in  principal amount  of the  Outstanding
     Securities shall  have the right  to direct the  time, method and place  of
     conducting any  proceeding  for any  remedy  available  to the  Trustee  or
     exercising any trust or power conferred on the Trustee, provided that

                  (1) such direction shall not  be in conflict with any rule  of
           law or with this Indenture, and
                  (2) the  Trustee may take  any other action  deemed proper  by
           the Trustee which is not inconsistent with such direction.

     SECTION 5.13.  Waiver of Past Defaults.
                    -----------------------

           The Holders,  either (a) through the written consent of not less than
     a majority in  aggregate principal amount of the Outstanding Securities, or
     (b) by  the  adoption of  a resolution,  at  a meeting  of  Holders of  the
     Outstanding Securities at which  a quorum is present, by the Holders  of at
     least  66-2/3%   in  principal   amount  of   the  Outstanding   Securities
     represented at  such meeting,  may  on behalf  of the  Holders of  all  the
     Securities waive any  past default hereunder and its consequences, except a
     default (1)  in  the payment  of  the principal  of,  premium, if  any,  or
     interest  on any Security,  or (2)  in respect  of a covenant  or provision
     hereof which under Article Eight  cannot be modified or amended without the
     consent of the Holder of each Outstanding Security affected.

           Upon any  such waiver,  such default  shall cease  to exist, and  any
     Event of Default arising  therefrom shall be deemed to have been cured, for


                                        - 64 -
<PAGE>






     every purpose of this  Indenture; but  no such waiver  shall extend to  any
     subsequent or other default or impair any right consequent thereon.

     SECTION 5.14.  Undertaking for Costs.
                    ---------------------

           All parties to this Indenture agree,  and each Holder of any Security
     by his acceptance  thereof shall be deemed  to have agreed, that  any court
     may in  its discretion  require, in  any suit  for the  enforcement of  any
     right or remedy  under this Indenture, or  in any suit against  the Trustee
     for any action taken, suffered or  omitted by it as Trustee, the  filing by
     any party litigant  in such suit of an undertaking to pay the costs of such
     suit, and  that such court may  in its discretion  assess reasonable costs,
     including reasonable attorneys'  fees, against  any party litigant  in such
     suit, having  due regard  to the  merits and  good faith  of the claims  or
     defenses  made by such  party litigant; but the  provisions of this Section
     5.14 shall  not apply to any  suit instituted by  the Company, to  any suit
     instituted by the Trustee, to any suit  instituted by any Holder, or  group
     of Holders, holding  in the aggregate more than  10% in principal amount of
     the Outstanding Securities, or to any suit instituted  by any Holder of any
     Security for the enforcement of  the payment of the principal of,  premium,
     if any,  or interest  on any  Security on  or after  the respective  Stated
     Maturity  or Maturities  expressed in  such  Security (or,  in the  case of
     redemption or repurchase,  on or after  the Redemption  Date or  Repurchase
     Date, as the  case may be) or  for the enforcement of the  right to convert
     any Security in accordance with Article Twelve.

     SECTION 5.15.  Waiver of Stay or Extension Laws.
                    --------------------------------

           The Company  covenants (to  the extent that  it may  lawfully do  so)
     that it  will not  at any  time insist  upon, or  plead, or  in any  manner
     whatsoever  claim  or  take  the  benefit  or  advantage of,  any  stay  or
     extension law wherever  enacted, now  or at  any time  hereafter in  force,
     which may  affect the covenants or  the performance of  this Indenture; and
     the  Company (to the  extent that it may  lawfully do  so) hereby expressly
     waives all benefit or  advantage of any such law and covenants that it will
     not hinder, delay  or impede the execution  of any power herein  granted to
     the Trustee, but will suffer and permit  the execution of every such  power
     as though no such law had been enacted.


                                     ARTICLE SIX

                                     THE TRUSTEE

     SECTION 6.1.  Certain Duties and Responsibilities.
                   -----------------------------------

           (a) Except during the continuance of an Event of Default,



                                        - 65 -
<PAGE>






                  (1)  the Trustee  undertakes to perform  such duties  and only
           such duties as are specifically set forth  in this Indenture, and  no
           implied covenants  or obligations shall be  read into this  Indenture
           against the Trustee; and

                  (2) in the absence of  bad faith on its part, the  Trustee may
           conclusively  rely,  as  to  the  truth  of  the  statements  and the
           correctness of the  opinions expressed therein, upon certificates  or
           opinions furnished  to the Trustee and conforming to the requirements
           of  this  Indenture; but  in the  case  of any  such certificates  or
           opinions which by any provision hereof  are specifically required  to
           be furnished  to the Trustee,  the Trustee shall  be under  a duty to
           examine the same  to determine  whether or  not they  conform to  the
           requirements  of  this  Indenture,  but not  to  verify  the contents
           thereof.

           (b) In  case an Event of  Default has occurred  and is continuing  of
     which a  responsible  officer of  the  Trustee  has actual  knowledge,  the
     Trustee shall exercise such of the rights  and powers vested in it by  this
     Indenture, and use the same  degree of care and skill in their  exercise as
     a prudent man would  exercise or use under the circumstances in the conduct
     of his own affairs.

           (c) No provision of this Indenture shall  be construed to relieve the
     Trustee from  liability for  its own  negligent action,  its own  negligent
     failure to act, or its own willful misconduct, except that

                  (1) this  paragraph (c) shall  not be construed  to limit  the
           effect of paragraph (a) of this Section;

                  (2) the Trustee shall not  be liable for any error of judgment
           made  in  good faith  by a  Responsible Officer,  unless it  shall be
           proved that the Trustee was  negligent in ascertaining  the pertinent
           facts;

                  (3)  the Trustee  shall  not be  liable  with respect  to  any
           action  taken  or  omitted  to  be  taken  by  it in  good  faith  in
           accordance  with  the direction  of  the  Holders  of  a majority  in
           principal amount of the Outstanding Securities relating to the  time,
           method  and  place  of  conducting  any  proceeding  for  any  remedy
           available to the Trustee, or exercising  any trust or power conferred
           upon the Trustee, under this Indenture; and

                  (4) no provision  of this Indenture shall  require the Trustee
           to  expend or  risk its  own funds  or otherwise  incur any financial
           liability in the  performance of any of  its duties hereunder,  or in
           the  exercise of  any  of its  rights or  powers,  if it  shall  have
           reasonable  grounds for  believing that  repayment of  such funds  or
           adequate  indemnity against such  risk or liability is not reasonably
           assured to it.



                                        - 66 -
<PAGE>






           (d) Whether or not therein expressly  so provided, every provision of
     this  Indenture relating to  the conduct or  affecting the  liability of or
     affording protection  to the Trustee shall be subject  to the provisions of
     this Section.

     SECTION 6.2.  Notice of Defaults.
                   ------------------

           Within 90 days  after the occurrence of  any default hereunder as  to
     which the Trustee  has received written notice,  the Trustee shall give  to
     all Holders  of Securities, in  the manner provided in  Section 1.6, notice
     of  such default,  unless such  default  shall have  been cured  or waived;
     provided,  however, that, except in the case of a default in the payment of
     the  principal  of,  premium, if  any,  or interest  on  any  Security, the
     Trustee  shall be protected  in withholding such notice  if and  so long as
     the board  of directors,  the executive committee  or a trust  committee of
     directors or  Responsible Officers of  the Trustee in  good faith determine
     that the withholding of such notice is in the interest of the Holders;  and
     provided,  further,  that in  the  case of  any  default  of the  character
     specified  in Section  5.1(10),  no such  notice  to Holders  of Securities
     shall be given until at  least 30 days after  the occurrence thereof.   For
     the purpose of  this Section, the term "default"  means any event which is,
     or after  notice  or  lapse of  time  or both  would  become, an  Event  of
     Default.

     SECTION 6.3.  Certain Rights of Trustee.
                   -------------------------

           Subject to the provisions of Section 6.1:

                  (1) the Trustee  may rely and shall be  protected in acting or
           refraining from  acting upon  any resolution,  Officers' Certificate,
           other certificate,  statement, instrument,  opinion, report,  notice,
           request,  direction, consent, order, bond,  debenture, other evidence
           of  indebtedness or  other paper  or document  believed  by it  to be
           genuine and to have been signed or presented  by the proper party  or
           parties;

                  (2) any request  or direction of the  Company mentioned herein
           shall  be  sufficiently evidenced  by a  Company  Request or  Company
           Order  and  any  resolution  of  the  Board  of  Directors  shall  be
           sufficiently evidenced by a Board Resolution;

                  (3)  whenever  in the  administration  of  this Indenture  the
           Trustee  shall  deem  it  desirable  that   a  matter  be  proved  or
           established  prior  to  taking,  suffering  or  omitting  any  action
           hereunder, the Trustee (unless other evidence be herein  specifically
           prescribed) may, in the absence of bad faith  on its part, rely  upon
           an Officers' Certificate;

                  (4)  the Trustee may consult with counsel of its selection and
           the advice of such  counsel or any  Opinion of Counsel shall be  full

                                        - 67 -
<PAGE>






           and  complete authorization and  protection in  respect of any action
           taken,  suffered or  omitted by  it hereunder  in  good faith  and in
           reliance thereon;

                  (5) the Trustee  shall be under no obligation to  exercise any
           of the  rights or  powers  vested in  it  by  this Indenture  at  the
           request or direction of any of  the Holders of Securities pursuant to
           this  Indenture,  unless  such Holders  shall  have  offered  to  the
           Trustee reasonable security or indemnity against the costs,  expenses
           and liabilities  which might  be incurred  by it  in compliance  with
           such request or direction;

                  (6) the Trustee  shall not be bound to make  any investigation
           into  the facts  or  matters stated  in any  resolution, certificate,
           statement, instrument,  opinion, report,  notice, request, direction,
           consent,   order,   bond,   debenture,   note,   other  evidence   of
           indebtedness  or other paper  or document,  but the  Trustee may make
           such further inquiry or investigation into  such facts or matters  as
           it may  see fit,  and, if  the Trustee  shall determine to  make such
           further  inquiry or investigation,  it shall  be entitled  to examine
           the books,  records and  premises of  the Company,  personally or  by
           agent or attorney;

                  (7)  the Trustee  may  execute any  of  the trusts  or  powers
           hereunder or  perform any duties hereunder  either directly  or by or
           through agents or attorneys and the  Trustee shall not be responsible
           for  any  misconduct  or  negligence on  the  part  of any  agent  or
           attorney appointed with due care by it hereunder;

                  (8) the  permissive right of  the Trustee to  take or  refrain
           from  taking any actions  enumerated in  this Indenture  shall not be
           construed as a duty  and the Trustee shall not be answerable in  such
           actions other than for its own negligence or willful misconduct; and

                  (9)  the Trustee  shall not  be liable  for any  action taken,
           suffered or omitted to  be taken by it  in good faith  and reasonably
           believed by it  to be authorized or  within the discretion or  rights
           or powers conferred upon it by the Indenture.

     SECTION 6.4.  Not Responsible for Recitals or Issuance of Securities.
                   ------------------------------------------------------

           The  recitals contained  herein  and in  the  Securities  (except the
     Trustee's certificates of authentication) shall be  taken as the statements
     of  the  Company, and  the  Trustee  assumes  no  responsibility for  their
     correctness.   The Trustee makes no  representations as to  the validity or
     sufficiency of this Indenture,  of the Securities or  of the Common  Shares
     issuable upon the conversion of the Securities.   The Trustee shall not  be
     accountable for the use or application by the Company of Securities or  the
     proceeds thereof.



                                        - 68 -
<PAGE>






     SECTION 6.5.  May Hold Securities, Act as Trustee Under Other Indentures.
                   ----------------------------------------------------------


           The  Trustee,  any  Authenticating  Agent,  any  Paying  Agent,   any
     Conversion Agent or any other agent of  the Company or the Trustee, in  its
     individual  or any  other  capacity, may  become  the owner  or pledgee  of
     Securities and may otherwise deal with the Company  with the same rights it
     would have  if it  were not  Trustee, Authenticating  Agent, Paying  Agent,
     Conversion Agent or such other agent.

           The Trustee  may become  and act  as trustee  under other  indentures
     under which other securities, or certificates of  interest or participation
     in other securities, of  the Company are outstanding in the same  manner as
     if it were not Trustee hereunder.

     SECTION 6.6.  Money Held in Trust.
                   -------------------

           Money held by the  Trustee in trust hereunder need not be  segregated
     from other funds except  to the extent required by law.   The Trustee shall
     be under no  liability for interest on  any money received by  it hereunder
     except as otherwise agreed in writing with the Company.

     SECTION 6.7.  Compensation and Reimbursement.
                   ------------------------------

           The Company agrees

                  (1) to  pay to the Trustee from time to time such compensation
           as the  Company and  the Trustee  shall from  time to  time agree  in
           writing   for  all   services  rendered   by  it   hereunder   (which
           compensation shall not  be limited by any  provision of law in regard
           to the compensation of a trustee of an express trust);

                  (2)  except   as  otherwise  expressly   provided  herein,  to
           reimburse the Trustee upon  its request for  all reasonable expenses,
           disbursements and  advances  incurred  or  made  by  the  Trustee  in
           accordance  with  any provision  of  this  Indenture  (including  the
           reasonable compensation  and the  expenses and  disbursements of  its
           agents  and  counsel),  except  any  such  expense,  disbursement  or
           advance as may be attributable to its negligence or bad faith; and

                  (3)  to indemnify  the Trustee  (and its  directors, officers,
           employees  and agents)  for, and  to  hold  it harmless  against, any
           loss, liability or expense  incurred without negligence  or bad faith
           on its part, arising  out of or in connection with the acceptance  or
           administration  of this  trust,  including the  costs,  expenses  and
           reasonable  attorneys' fees of  defending itself against any claim or
           liability in  connection with the exercise  or performance  of any of
           its powers or duties hereunder.


                                        - 69 -
<PAGE>






           When  the Trustee incurs  expenses or  renders services in connection
     with  an Event of  Default specified in  Section 5.1(5)  or Section 5.1(6),
     the expenses  (including the  reasonable charges  of its  counsel) and  the
     compensation for  the services are  intended to constitute  expenses of the
     administration   under   any  applicable   Federal  or   state  bankruptcy,
     insolvency or other similar law.

           The provisions of this Section shall  survive the termination of this
     Indenture or the earlier resignation or removal of the Trustee.

     SECTION 6.8.  Corporate Trustee Required; Eligibility.
                   ---------------------------------------

           There shall  at all  times be a  Trustee hereunder which  shall be  a
     corporation  organized and  doing  business under  the  laws of  the United
     States of  America,  any  State  thereof,  or  the  District  of  Columbia,
     authorized under such  laws to exercise  corporate trust  powers, having  a
     combined  capital and  surplus  of at  least  U.S. $50,000,000,  subject to
     supervision or examination  by federal or state authority, in good standing
     and having  an established place of  business in the Borough  of Manhattan,
     The City of New York.  If  such corporation publishes reports of  condition
     at  least  annually,  pursuant  to  law  or  to the  requirements  of  said
     supervising or examining  authority, then for the purposes of this Section,
     the combined capital and  surplus of such corporation shall be deemed to be
     its combined capital and surplus as set forth in  its most recent report of
     condition so published.   If  at any  time the  Trustee shall  cease to  be
     eligible in  accordance  with the  provisions  of  this Section,  it  shall
     resign immediately in  the manner and with the effect hereinafter specified
     in  this Article and  a successor  shall be  appointed pursuant  to Section
     6.9.

     SECTION 6.9.  Resignation and Removal; Appointment of Successor.
                   -------------------------------------------------

           (a) No resignation or removal of the Trustee and no appointment of  a
     successor Trustee  pursuant to  this Article  shall become  effective until
     the acceptance of appointment by  the successor Trustee in  accordance with
     the applicable requirements of Section 6.10.

           (b) The  Trustee may  resign at  any  time by  giving written  notice
     thereof to  the Company.   If the instrument  of acceptance by a  successor
     Trustee  required by  Section 6.10  shall not  have been  delivered to  the
     Trustee within 30 days after the giving of such notice of resignation,  the
     resigning Trustee may  petition any court of competent jurisdiction for the
     appointment of a successor Trustee.

           (c) The Trustee may be removed at any  time by Act of the  Holders of
     a majority in  principal amount of the Outstanding Securities, delivered to
     the  Trustee and  the  Company.   If  the  instrument  of acceptance  by  a
     successor Trustee  required by Section  6.10 shall not  have been delivered
     to the Trustee within  30 days after the giving of such  notice of removal,


                                        - 70 -
<PAGE>






     the removed  Trustee may petition  any court of  competent jurisdiction for
     the appointment of a successor Trustee.

           (d) If at any time:

                  (1) the Trustee  shall cease to be eligible under  Section 6.8
           and shall  fail  to resign  after  written  request therefor  by  the
           Company or  by any  Holder of  a Security  who has  been a  bona fide
           Holder of a Security for at least six months, or

                  (2) the Trustee  shall become incapable of acting or  shall be
           adjudged a bankrupt or insolvent or a receiver  of the Trustee or  of
           its property  shall be  appointed or  any public  officer shall  take
           charge or control  of the Trustee or of  its property or affairs  for
           the purpose of rehabilitation, conservation or liquidation,

     then, in  any such case (i)  the Company by  a Board Resolution  may remove
     the Trustee, or (ii) subject to Section 5.14, any Holder of a Security  who
     has been a bona fide Holder  of a Security for at least six months  may, on
     behalf of himself and all others similarly  situated, petition any court of
     competent jurisdiction for the removal  of the Trustee and  the appointment
     of a successor Trustee.

           (e) If the  Trustee shall resign, be  removed or become  incapable of
     acting,  or if  a vacancy  shall occur  in the  office of  Trustee for  any
     cause,  the  Company, by  a  Board  Resolution,  shall  promptly appoint  a
     successor Trustee  and  shall comply  with the  applicable requirements  of
     this  Section  and   Section  6.10.    If,  within   one  year  after  such
     resignation, removal or  incapability, or the occurrence of such vacancy, a
     successor Trustee shall  be appointed by Act  of the Holders of  a majority
     in principal amount  of the Outstanding Securities delivered to the Company
     and  the  retiring  Trustee,  the  successor  Trustee so  appointed  shall,
     forthwith upon  its acceptance of  such appointment in  accordance with the
     applicable  requirements of Section 6.10, become  the successor Trustee and
     supersede the successor  Trustee appointed by the Company.  If no successor
     Trustee shall  have been  so appointed  by the  Company or  the Holders  of
     Securities and accepted  appointment in the manner required by this Section
     and Section 6.10, any Holder of a Security who  has been a bona fide Holder
     of a Security  for at least  six months may, on  behalf of himself and  all
     others similarly  situated, petition  any court  of competent  jurisdiction
     for the appointment of a successor Trustee.

           (f) The  Company  shall give  notice  of  each resignation  and  each
     removal of the Trustee  and each appointment of a successor Trustee  to all
     Holders of Securities in the manner provided  in Section 1.6.  Each  notice
     shall  include the name  of the  successor Trustee  and the address  of its
     Corporate Trust Office.






                                        - 71 -
<PAGE>






     SECTION 6.10. Acceptance of Appointment by Successor.
                   --------------------------------------

           Every  successor   Trustee   appointed   hereunder   shall   execute,
     acknowledge and  deliver  to the  Company and  to the  retiring Trustee  an
     instrument accepting  such appointment,  and thereupon  the resignation  or
     removal of the retiring Trustee  shall become effective and  such successor
     Trustee, without any further act,  deed or conveyance, shall  become vested
     with all  the rights, powers,  trusts and duties  of the retiring  Trustee;
     but, on the request of the Company or the successor Trustee, such  retiring
     Trustee shall,  upon  payment  of  its  charges,  execute  and  deliver  an
     instrument transferring  to such successor  Trustee all the rights,  powers
     and trusts  of the retiring  Trustee and  shall duly  assign, transfer  and
     deliver  to such  successor Trustee  all property  and money  held  by such
     retiring Trustee  hereunder.  Upon  request of any  such successor Trustee,
     the Company  shall  execute any  and all  instruments  for more  fully  and
     certainly vesting  in and  confirming to  such successor  Trustee all  such
     rights, powers and trusts.

           No successor Trustee shall accept its  appointment unless at the time
     of such  acceptance such  successor Trustee  shall be  eligible under  this
     Article.

     SECTION 6.11. Merger, Conversion, Consolidation or Succession to Business.
                   -----------------------------------------------------------

           Any corporation  into which the Trustee may be merged or converted or
     with which it  may be consolidated,  or any corporation resulting  from any
     merger, conversion  or consolidation to which the Trustee shall be a party,
     or any corporation succeeding  to all or substantially all of the corporate
     trust  business of  the Trustee,  shall  be the  successor  of the  Trustee
     hereunder,  provided such  corporation shall  be  otherwise eligible  under
     this Article without  the execution or filing  of any paper or  any further
     act on  the part of  any of  the parties  hereto.  In  case any  Securities
     shall have  been authenticated, but not  delivered, by the  Trustee then in
     office,  any  successor  by  merger, conversion  or  consolidation  to such
     authenticating  Trustee  may  adopt such  authentication  and  deliver  the
     Securities  so authenticated  with  the same  effect  as if  such successor
     Trustee had itself authenticated such Securities.

     SECTION 6.12. Authenticating Agents.
                   ---------------------

           The  Trustee  may,  with  the  consent  of  the  Company,  appoint an
     additional Authenticating  Agent or  Agents acceptable to  the Company with
     respect to the Securities  which shall  be authorized to  act on behalf  of
     the   Trustee  to   authenticate  Securities   issued   upon  exchange   or
     substitution pursuant to this Indenture.

           Securities  authenticated  by   an  Authenticating  Agent  shall   be
     entitled  to  the  benefits  of  this  Indenture  and  shall  be  valid and
     obligatory for all purposes as  if authenticated by the  Trustee hereunder,

                                        - 72 -
<PAGE>






     and every  reference in this  Indenture to the  authentication and delivery
     of   Securities  by   the   Trustee  or   the   Trustee's  certificate   of
     authentication shall  be deemed to  include authentication and delivery  on
     behalf  of the  Trustee by  an Authenticating  Agent and  a certificate  of
     authentication  executed on  behalf  of the  Trustee  by an  Authenticating
     Agent.   Each Authenticating  Agent shall  be subject to  acceptance by the
     Company and  shall  at all  times  be  a corporation  organized  and  doing
     business  under  the  laws  of the  United  States  of  America,  any State
     thereof, the District of Columbia,  or England and Wales,  authorized under
     such  laws to  act as  Authenticating Agent  and subject to  supervision or
     examination by  government or other  fiscal authority.   If at any time  an
     Authenticating Agent  shall cease  to be  eligible in  accordance with  the
     provisions  of  this Section  6.12 such  Authenticating Agent  shall resign
     immediately in the  manner and with  the effect specified  in this  Section
     6.12.

           Any corporation into which an Authenticating  Agent may be merged  or
     converted or  with  which  it  may  be  consolidated,  or  any  corporation
     resulting  from any  merger,  conversion  or  consolidation to  which  such
     Authenticating Agent shall  be a party,  or any  corporation succeeding  to
     the  corporate agency  or  corporate trust  business  of an  Authenticating
     Agent,  shall  continue  to  be  an  Authenticating  Agent,  provided  such
     corporation shall be  otherwise eligible  under this Section  6.12, without
     the execution or filing of any  paper or any further act on the part of the
     Trustee or the Authenticating Agent.

           An Authenticating  Agent may  resign at  any time  by giving  written
     notice thereof to the Trustee and  to the Company.  The Trustee may at  any
     time terminate  the agency  of an  Authenticating Agent  by giving  written
     notice thereof  to such  Authenticating Agent  and to  the  Company.   Upon
     receiving such a  notice of resignation or  upon such a termination,  or in
     case at any  time such Authenticating Agent  shall cease to be  eligible in
     accordance with  the  provisions of  this  Section  6.12, the  Trustee  may
     appoint  a  successor  Authenticating  Agent  which  shall  be  subject  to
     acceptance  by  the  Company.   Any  successor  Authenticating  Agent  upon
     acceptance of  its appointment hereunder  shall become vested  with all the
     rights, powers  and duties of  its predecessor hereunder,  with like effect
     as  if  originally   named  as  an  Authenticating  Agent.    No  successor
     Authenticating  Agent  shall   be  appointed  unless  eligible   under  the
     provisions of this Section 6.12.

           The Company agrees to  pay to each Authenticating Agent from time  to
     time reasonable compensation for its services under this Section 6.12.

           If  an   Authenticating  Agent  is  appointed  with  respect  to  the
     Securities pursuant to  this Section 6.12, the Securities may have endorsed
     thereon,  in addition  to  or in  lieu  of the  Trustee's  certification of
     authentication,  an  alternative   certificate  of  authentication  in  the
     following form:




                                        - 73 -
<PAGE>






           This  is one of  the Securities  referred to  in the within-mentioned
     Indenture.

           Dated:                                MARINE MIDLAND BANK
                                                    as Trustee
                                                 By [Authenticating Agent],
                                                    as Authenticating Agent


                                                 By______________________
                                                    Authorized Signatory


     SECTION 6.13. Trust Indenture Legislation.
                   ---------------------------

           In this Indenture,  the expression "indenture legislation" means  the
     provisions, if  any, of the Canada Business Corporations Act, as amended or
     re-enacted,  and any other statute of Canada,  and of any regulations under
     such statute,  relating to trust indentures  and to the rights,  duties and
     obligations of trustees under trust indentures  and of corporations issuing
     debt  obligations  under  trust   indentures,  to  the  extent  that   such
     provisions are  at the time  in force and  applicable to this Indenture  or
     the  Company.   The Company and  the Trustee  agree that  each will  at all
     times in  relation to this Indenture  and in relation  to any action  to be
     taken hereunder observe and comply with and be  entitled to the benefits of
     indenture legislation.   If and to the  extent that, any provision  of this
     Indenture  limits, qualifies or conflicts with any mandatory requirement of
     indenture legislation, such mandatory requirement shall prevail.


                                    ARTICLE SEVEN

                         AMALGAMATION, CONSOLIDATION, MERGER,
                            CONVEYANCE, TRANSFER OR LEASE


     SECTION 7.1.  Company May  Amalgamate, Consolidate,  Etc., Only on  Certain
                   Terms.
                   ----------------------------------------------------------

           The  Company   may  not  consolidate,   amalgamate,  enter  into   an
     arrangement or merge with or into any Person or  permit any other Person to
     consolidate, amalgamate,  enter into an  arrangement or merge  with or into
     the Company (whether or  not the Company is the  surviving corporation), or
     sell, assign,  transfer,  lease, convey  or  otherwise  dispose of  all  or
     substantially  all of  its properties  or assets  in one  transaction  or a
     series of  related  transactions to  any  Person,  if such  transaction  or
     series  of  transactions,  in  the  aggregate,  would  result  in  a  sale,
     assignment, transfer, lease  or other  disposition of all  or substantially
     all of the properties and assets of the  Company or of the Company and  its


                                        - 74 -
<PAGE>






     Subsidiaries on a consolidated  basis to any  other Person, unless, at  the
     time and giving effect thereto:

                  (1) the Company  is the  surviving corporation  or the  Person
           formed   by  or  surviving   any  such  consolidation,  amalgamation,
           arrangement or merger (if  other than the Company),  or to which such
           sale, transfer,  lease, conveyance  or other  disposition shall  have
           been made, is a corporation organized and existing  under the laws of
           (i) the United States, any state thereof or the District of  Columbia
           or (ii) the federal laws of Canada or any province thereof;

                  (2) the Person formed  by or surviving any such consolidation,
           amalgamation,  arrangement or merger  (if other than the Company), or
           the  Person  to   which  such  sale,  assignment,  transfer,   lease,
           conveyance  or other  disposition shall  have  been made,  assumes by
           supplemental indenture in a  form and substance  satisfactory to  the
           Trustee all the obligations of the  Company under the Securities  and
           this  Indenture  and  such  Person  assumes the  obligations  of  the
           Company under the Registration Rights Agreement;

                  (3)  immediately prior  to  and after  giving  effect  to such
           transaction,  no  default hereunder  or Event  of Default  shall have
           occurred and be continuing;

                  (4)  the  interest,  principal,  premium,  if any,  and  other
           amounts paid  or credited in  respect of the  Securities will not  be
           subject  to  Canadian  Taxes  as  a  result  of  such  consolidation,
           amalgamation, arrangement, merger, sale  assignment, transfer, lease,
           conveyance  or  other   disposition,  and  the  Company  shall   have
           delivered  to the  Trustee an  Opinion  of  Canadian Counsel  to that
           effect.

           The Company shall  deliver to  the Trustee and  each Holder prior  to
     the consummation of  the proposed transaction an  Officers' Certificate  to
     the foregoing  effect and an Opinion  of Counsel stating  that the proposed
     transaction and  such supplemental  indenture comply  with this  Indenture,
     each in form and substance satisfactory to the Trustee.

     SECTION 7.2.  Successor Substituted.
                   ---------------------

           Upon  any amalgamation  or  consolidation  of  the Company  with,  or
     merger of the  Company into, any other  Person or any conveyance,  transfer
     or lease  of all  or substantially  all the  properties and  assets of  the
     Company in  accordance with  Section 7.1,  the successor  Person formed  by
     such consolidation or into  which the  Company is merged  or to which  such
     conveyance, transfer or lease is  made shall succeed to, and be substituted
     for, and may  exercise every  right and power  of, the  Company under  this
     Indenture with the  same effect as if such  successor Person had been named
     as the Company herein, and thereafter,  except in the case of a  lease, the
     predecessor Person  shall  be relieved  of  all obligations  and  covenants
     under this Indenture and the Securities.

                                        - 75 -
<PAGE>






                                    ARTICLE EIGHT

                               SUPPLEMENTAL INDENTURES

     SECTION 8.1.  Supplemental  Indentures   Without  Consent  of  Holders   of
                   Securities.
                   -----------------------------------------------------

           Without the consent of any Holders  of Securities, the Company,  when
     authorized by a Board  Resolution, and  the Trustee, at  any time and  from
     time to time,  may enter  into one or  more indentures supplemental  hereto
     for any of the following purposes:

                  (1)  to evidence  the  succession  of another  Person  to  the
           Company  and the assumption  by any  such successor  of the covenants
           and obligations  of  the Company  herein  and  in the  Securities  as
           permitted by this Indenture; or

                  (2) to add to the covenants of the Company  for the benefit of
           the Holders of Securities, or to surrender any right or power  herein
           conferred upon the Company; or

                  (3) to secure the Securities; or

                  (4) to make  provision with  respect to the conversion  rights
           of Holders of Securities pursuant to Section 12.11; or

                  (5)  to  cure any  ambiguity,  to  correct or  supplement  any
           provision herein which may be inconsistent  with any other  provision
           herein  or  which  is  otherwise  defective,  or  to  make  any other
           provisions  with respect  to matters or questions  arising under this
           Indenture as  the  Company and  the  Trustee  may deem  necessary  or
           desirable, provided,  such action pursuant  to this  clause (5) shall
           not adversely affect the interests of the Holders of Securities; or

                  (6)   to make  any changes or modifications  to this Indenture
           necessary in       connection   with   the   registration   of    any
           Securities  under  the Securities  Act  as  contemplated  by  Section
           10.12, provided,  such action pursuant to  this clause  (6) shall not
           adversely affect the interests of the Holders of Securities; or

                  (7)   to comply  with the requirements of  the Trust Indenture
           Act or the         rules   and   regulations   of   the    Commission
           thereunder in order to affect or  maintain the qualification of  this
           Indenture under  the  Trust Indenture  Act, as  contemplated by  this
           Indenture or otherwise.

           Upon Company Request,  accompanied by a Board Resolution  authorizing
     the  execution of any such supplemental  indenture, and subject to and upon
     receipt by the  Trustee of the  documents described in Section  8.3 hereof,
     the  Trustee   shall  join  with  the  Company  in  the  execution  of  any
     supplemental  indenture authorized  or  permitted  by  the  terms  of  this

                                        - 76 -
<PAGE>






     Indenture and to  make any further appropriate  agreements and stipulations
     which may be therein contained.

     SECTION 8.2.  Supplemental Indentures with Consent of Holders of
                    Securities.
                   --------------------------------------------------

           With either (a) the  written consent of the Holders of not less  than
     a majority  in principal amount of  the Outstanding Securities, by  the Act
     of said  Holders delivered to  the Company and the  Trustee, or (b)  by the
     adoption  of a  resolution,  at a  meeting of  Holders  of the  Outstanding
     Securities at  which a  quorum is  present, by  the Holders  of 66-2/3%  in
     principal  amount  of  the  Outstanding  Securities   represented  at  such
     meeting, the  Company,  when authorized  by  a  Board Resolution,  and  the
     Trustee may enter into an  indenture or indentures supplemental  hereto for
     the purpose  of adding  any  provisions to  or changing  in any  manner  or
     eliminating any of the provisions of this Indenture  or of modifying in any
     manner the  rights  of the  Holders  of  Securities under  this  Indenture;
     provided, however, that  no such supplemental indenture  shall, without the
     consent or  affirmative vote  of the  Holder of  each Outstanding  Security
     affected thereby,

                  (1) change  the Stated Maturity  of the principal  of, or  any
           installment of interest  on, any  Security, or  reduce the  principal
           amount  or  the rate  of  interest  payable  thereon  or any  premium
           payable upon  redemption or mandatory  repurchase thereof, or  change
           the obligation  of the Company to  pay Additional  Amounts, or change
           the coin, currency or  security in which any Security or the interest
           or any  premium thereon  or any  other amount  in respect  thereof is
           payable, or  impair the right to  institute suit  for the enforcement
           of any  payment in  respect of  any Security  on or after  the Stated
           Maturity thereof  (or, in the case  of redemption  or any repurchase,
           on or after the Redemption Date or Repurchase  Date, as the case  may
           be) or,  except as permitted by  Section 12.11,  adversely affect the
           right  to convert  any Security  as  provided  in Article  Twelve, or
           modify  the   provisions  of  this  Indenture  with  respect  to  the
           subordination of  the Securities in a  manner adverse  to the Holders
           of Securities, or

                  (2) reduce  the requirements  of  Section 9.4  for  quorum  or
           voting,  or  reduce   the  percentage  in  principal  amount  of  the
           Outstanding Securities the consent of  whose Holders is  required for
           any such  supplemental indenture or the  consent of  whose Holders is
           required for  any waiver  (of compliance with  certain provisions  of
           this Indenture or certain defaults hereunder and their  consequences)
           provided for in this Indenture, or

                  (3)  modify  the obligation  of  the  Company  to maintain  an
           office or agency in  the Borough of Manhattan,  The City of New York,
           or



                                        - 77 -
<PAGE>






                  (4)  modify any of  the provisions of this  Section or Section
           5.13 or 10.13, except to increase  any percentage contained herein or
           therein  or  to  provide  that  certain  other  provisions  of   this
           Indenture  cannot be modified  or waived  without the  consent of the
           Holder of each Outstanding Security affected thereby; or

                  (5)  modify the  provisions of  Article  Fourteen in  a manner
           adverse to the Holders; or

                  (6)  modify any of  the provisions of Section  10.10, 10.11 or
           10.12.

           It shall not be  necessary for any Act of Holders of Securities under
     this Section  to approve the  particular form of  any proposed supplemental
     indenture,  but it  shall  be  sufficient if  such  Act shall  approve  the
     substance thereof.

     SECTION 8.3.  Execution of Supplemental Indentures.
                   ------------------------------------

           In  executing, or  accepting the  additional trusts  created by,  any
     supplemental  indenture permitted  by  this  Article or  the  modifications
     thereby  of the  trusts created  by  this Indenture,  the Trustee  shall be
     entitled to receive, and (subject to Sections  6.1 and 6.3) shall be  fully
     protected  in  relying  upon,  an  Opinion  of  Counsel  stating  that  the
     execution  of such  supplemental indenture  is authorized  or permitted  by
     this  Indenture,  and  that  such  supplemental  indenture  has  been  duly
     authorized, executed and delivered by  the Company and constitutes  a valid
     and  legally binding  obligation  of the  Company  enforceable against  the
     Company in accordance  with its terms.   The Trustee may, but shall  not be
     obligated to, enter  into any such supplemental indenture which affects the
     Trustee's  own  rights,  duties  or  immunities  under  this  Indenture  or
     otherwise.

     SECTION 8.4.  Effect of Supplemental Indentures.
                   ---------------------------------

           Upon the execution of any supplemental  indenture under this Article,
     this  Indenture  shall  be  modified  in  accordance  therewith,  and  such
     supplemental indenture  shall  form  a  part  of  this  Indenture  for  all
     purposes;  and  every  Holder  of  Securities   theretofore  or  thereafter
     authenticated and delivered  hereunder appertaining thereto shall  be bound
     thereby.

     SECTION 8.5.  Reference in Securities to Supplemental Indentures.
                   --------------------------------------------------

           Securities authenticated  and delivered  after the  execution of  any
     supplemental indenture pursuant  to this Article may, and shall if required
     by the Trustee, bear  a notation in form approved by  the Trustee as to any
     matter provided for in such  supplemental indenture.  If the  Company shall
     so determine, new  Securities so modified as to  conform, in the opinion of

                                        - 78 -
<PAGE>






     the Company and  the Trustee,  to any  such supplemental  indenture may  be
     prepared and executed  by the Company  and authenticated  and delivered  by
     the Trustee in exchange for Outstanding Securities.

     SECTION 8.6.  Notice of Supplemental Indentures.
                   ---------------------------------

           Promptly after the execution  by the Company and  the Trustee of  any
     supplemental indenture  pursuant  to the  provisions  of Section  8.2,  the
     Company  shall  give notice  to all  Holders  of Securities  of  such fact,
     setting  forth  in   general  terms  the  substance  of  such  supplemental
     indenture, in  the manner  provided in  Section 1.6.   Any  failure of  the
     Company to give such  notice, or any defect  therein, shall not in  any way
     impair or affect the validity of any such supplemental indenture.


                                     ARTICLE NINE

                          MEETINGS OF HOLDERS OF SECURITIES

     SECTION 9.1.  Purposes for Which Meetings May Be Called.
                   -----------------------------------------

           A meeting of  Holders of Securities  may be  called at  any time  and
     from  time to  time pursuant  to this  Article to  make, give  or take  any
     request,  demand,  authorization,  direction, notice,  consent,  waiver  or
     other action  provided by  this Indenture  to be  made, given  or taken  by
     Holders of Securities.

     SECTION 9.2.  Call, Notice and Place of Meetings.
                   ----------------------------------

           (a)  The Trustee  may  at any  time  call  a  meeting of  Holders  of
     Securities for any purpose  specified in  Section 9.1, to  be held at  such
     time and at such place in  the Borough of Manhattan, The City of New  York,
     or in the City of London, England, as the Trustee shall determine.   Notice
     of every meeting  of Holders of Securities, setting  forth the time and the
     place of such meeting and in general terms the  action proposed to be taken
     at  such meeting, shall  be given, in the  manner provided  in Section 1.6,
     not less than  21 nor more than  180 days prior to  the date fixed for  the
     meeting.

           (b) In case at  any time the Company, pursuant to a Board Resolution,
     or the  Holders of  at least  25% in  principal amount  of the  Outstanding
     Securities shall  have  requested the  Trustee  to call  a meeting  of  the
     Holders of Securities  for any purpose specified in Section 9.1, by written
     request setting forth in reasonable  detail the action proposed to be taken
     at the meeting, and the Trustee shall  not have made the first  publication
     of the notice of such meeting within 21 days after receipt of  such request
     or  shall not  thereafter  proceed  to cause  the  meeting  to be  held  as
     provided herein,  then the  Company or  the  Holders of  Securities in  the
     amount  specified, as the case may be, may determine the time and the place

                                        - 79 -
<PAGE>






     in the  Borough of  Manhattan, The  City of  New York,  or in  the City  of
     London,  England,for  such meeting  and  may  call  such  meeting for  such
     purposes by  giving notice  thereof as provided  in paragraph  (a) of  this
     Section.

     SECTION 9.3.  Persons Entitled to Vote at Meetings.
                   ------------------------------------

           To be  entitled to vote  at any meeting  of Holders  of Securities, a
     Person shall be (a) a Holder of one or more Outstanding Securities,  or (b)
     a  Person appointed by  an instrument in  writing as proxy  for a Holder or
     Holders of one or  more Outstanding Securities  by such Holder or  Holders.
     The only Persons who  shall be entitled to  be present or  to speak at  any
     meeting of Holders  shall be the Persons  entitled to vote at  such meeting
     and their counsel, any  representatives of the Trustee and its  counsel and
     any representatives of the Company and its counsel.

     SECTION 9.4.  Quorum; Action.
                   --------------

           The  Persons entitled to  vote a majority in  principal amount of the
     Outstanding  Securities shall  constitute a  quorum.   In the  absence of a
     quorum within 30  minutes of the time  appointed for any such  meeting, the
     meeting shall,  if convened at  the request  of Holders  of Securities,  be
     dissolved.  In  any other cases the  meeting may be adjourned for  a period
     of not less  than 10  days as  determined by  the chairman  of the  meeting
     prior  to the adjournment of such  meeting.  In the absence  of a quorum at
     any   such  adjourned  meeting,  such  adjourned  meeting  may  be  further
     adjourned for a  period not less than 10 days as determined by the chairman
     of the meeting prior  to the adjournment of such adjourned meeting (subject
     to repeated applications of  this sentence).  Notice of the  reconvening of
     any adjourned meeting shall be given as provided  in Section 9.2(a), except
     that such notice need be given  only once not less than five  days prior to
     the date  on which the  meeting is scheduled  to be reconvened.   Notice of
     the  reconvening  of  an  adjourned  meeting   shall  state  expressly  the
     percentage of  the  principal amount  of the  Outstanding Securities  which
     shall constitute a quorum.

           Subject  to  the  foregoing,  at  the  reconvening  of  any   meeting
     adjourned  for a  lack of  a quorum, the  Persons entitled  to vote  25% in
     principal  amount   of  the  Outstanding  Securities   at  the  time  shall
     constitute  a quorum for the taking  of any action set  forth in the notice
     of the original meeting.

           At a meeting or an adjourned meeting duly  reconvened and at which  a
     quorum is present as aforesaid, any  resolution and all matters (except  as
     limited by  the proviso  to Section 8.2)  shall be  effectively passed  and
     decided if passed or decided by the  Persons entitled to vote not less than
     66-2/3%  in principal  amount  of  Outstanding Securities  represented  and
     entitled to vote at such meeting.



                                        - 80 -
<PAGE>






           Any resolution  passed or decisions taken  at any  meeting of Holders
     of Securities  duly held in accordance  with this Section  shall be binding
     on all the Holders  of Securities, whether or not present or represented at
     the  meeting.  The  Trustee shall,  in the name  and at the  expense of the
     Company,  notify all the  Holders of Securities of  any such resolutions or
     decisions pursuant to Section 1.6.

     SECTION 9.5.  Determination of  Voting Rights;  Conduct and Adjournment  of
                   Meetings.
                   ----------------------------------------------------------

           (a)  Notwithstanding any  other  provisions of  this  Indenture,  the
     Trustee may make such reasonable regulations  as it may deem advisable  for
     any  meeting of Holders of Securities in regard  to proof of the holding of
     Securities  and  of  the  appointment of  proxies  and  in  regard  to  the
     appointment  and  duties  of   inspectors  of  votes,  the  submission  and
     examination of proxies,  certificates and other  evidence of  the right  to
     vote, and such  other matters concerning the  conduct of the meeting  as it
     shall  deem appropriate.  Except as otherwise  permitted or required by any
     such regulations,  the holding  of Securities  and the  appointment of  any
     proxy shall be proved in the manners specified therefor in Section 1.4.

           (b)  The  Trustee shall,  by  an  instrument  in  writing, appoint  a
     temporary chairman (which may be the  Trustees) of the meeting, unless  the
     meeting shall have  been called by the Company  or by Holders of Securities
     as  provided in Section 9.2(b), in which case the Company or the Holders of
     Securities calling the  meeting, as the case  may be, shall in  like manner
     appoint  a  temporary chairman.    A  permanent  chairman  and a  permanent
     secretary of the meeting  shall be elected by vote of the  Persons entitled
     to vote  a  majority in  principal  amount  of the  Outstanding  Securities
     represented at the meeting.

           (c) At  any meeting,  each Holder  of a  Security or  proxy shall  be
     entitled to one  vote for each  U.S.$1,000 principal  amount of  Securities
     held or represented by  him; provided, however, that no vote shall  be cast
     or counted at  any meeting  in respect of  any Security  challenged as  not
     Outstanding  and  ruled  by   the  chairman  of  the  meeting  to   be  not
     Outstanding.   The chairman  of the meeting  shall have  no right to  vote,
     except as a Holder of a Security or proxy.

           (d) Any  meeting of  Holders of  Securities duly  called pursuant  to
     Section  9.2 at which  a quorum is  present may  be adjourned from  time to
     time  by Persons entitled  to vote  a majority  in principal amount  of the
     Outstanding Securities represented at the  meeting, and the meeting  may be
     held as so adjourned without further notice.

     SECTION 9.6.  Counting Votes and Recording Action of Meetings.
                   -----------------------------------------------

           The vote upon any  resolution submitted to any  meeting of Holders of
     Securities shall be  by written ballots  on which  shall be subscribed  the
     signatures of  the Holders  of Securities  or of  their representatives  by

                                        - 81 -
<PAGE>






     proxy and the principal  amounts at Stated  Maturity and serial numbers  of
     the Outstanding  Securities held  or represented  by them.   The  permanent
     chairman of the  meeting shall appoint  two inspectors of  votes who  shall
     count all votes cast  at the meeting for or against any  resolution and who
     shall make  and  file with  the secretary  of  the meeting  their  verified
     written reports in duplicate of all votes  cast at the meeting.  A  record,
     at least in duplicate,  of the  proceedings of each  meeting of Holders  of
     Securities  shall be  prepared by the  secretary of  the meeting  and there
     shall be attached to  said record the original reports of the inspectors of
     votes on  any vote by  ballot taken thereat and  affidavits by one  or more
     Persons having knowledge  of the facts setting  forth a copy of  the notice
     of  the meeting  and  showing that  said notice  was  given as  provided in
     Section 9.2 and, if  applicable, Section  9.4.  Each  copy shall be  signed
     and verified  by the affidavits of the permanent  chairman and secretary of
     the meeting  and  one such  copy  shall be  delivered  to the  Company  and
     another to the Trustee to  be preserved by the Trustee, the  latter to have
     attached thereto the  ballots voted at the  meeting.  Any record  so signed
     and verified shall be conclusive evidence of the matters therein stated.


                                     ARTICLE TEN

                                      COVENANTS

     SECTION 10.1. Payment of Principal, Premium and Interest.
                   ------------------------------------------

           The  Company covenants and  agrees that  it will  duly and punctually
     pay the principal  of and premium, if  any, and interest on  the Securities
     in  accordance with the  terms of the Securities  and this  Indenture.  The
     Company  will deposit  or  cause  to be  deposited  with the  Trustee,  one
     Business Day prior to  the Stated Maturity of any Security or  one Business
     Day prior to the due date for any installment of  interest, all payments so
     due, which payments shall be in immediately available funds on the date  of
     such Stated Maturity or due date, as the case may be.

     SECTION 10.2. Maintenance of Offices or Agencies.
                   ----------------------------------

           The  Company hereby appoints  (a) the  Corporate Trust  Office of the
     Trustee  as its agent  in the Borough of  Manhattan, The City  of New York,
     where  Securities  may  be  presented  or  surrendered  for  payment, where
     Securities may  be surrendered  for registration of  transfer or  exchange,
     where Securities may be surrendered  for conversion, and where  notices and
     demands  to or  upon  the Company  in respect  of  the Securities  and this
     Indenture may  be served,  and  (b) (i)  the office  of Midland  Bank  plc,
     Mariner House,  Pepys  Street, London  EC3N  4DA,  England, as  its  agents
     outside  of the  United States  where, subject  to any  applicable laws  or
     regulations, Securities  may be surrendered  for payment, where  Securities
     may be  surrendered for  registration of  transfer or  exchange, and  where
     Securities may be surrendered for conversion.


                                        - 82 -
<PAGE>






           The Company  may at any time and from time to  time vary or terminate
     the appointment of any such agent or appoint  any additional agents for any
     or  all  of such  purposes;  provided,  however,  that  until  all  of  the
     Securities have been delivered to  the Trustee for cancellation,  or moneys
     sufficient to pay  the principal of, premium,  if any, and interest  on the
     Securities have  been  made  available  for  payment  and  either  paid  or
     returned to the  Company pursuant to  the provisions  of Section 10.3,  the
     Company will  maintain (1)  in the Borough  of Manhattan,  The City of  New
     York, an office or agency where Securities  may be presented or surrendered
     for  payment  and  conversion,  where  Securities  may  be surrendered  for
     registration of  transfer or exchange  and where notices and  demands to or
     upon  the Company in  respect of the Securities  and this  Indenture may be
     served, and (2) subject to any  laws or regulations applicable thereto,  in
     London,  an  office  or  agency  where  Securities  may  be  presented  and
     surrendered  for   payment  and  where  Securities  may  be  presented  for
     registration of transfer or exchange or conversion.

           If at any time the Company shall fail  to maintain any such  required
     office or agency, or  shall fail  to furnish the  Trustee with the  address
     thereof, presentations and surrenders may  be made and notices  and demands
     may be served on the Corporate Trust Office of the Trustee.

     SECTION 10.3. Money for Security Payments To Be Held in Trust.
                   -----------------------------------------------

           If the Company  shall act  as its  own Paying Agent,  it will, on  or
     before  each due date of the principal of,  premium, if any, or interest on
     any of the Securities, segregate and  hold in trust for the benefit of  the
     Persons entitled  thereto a sum  sufficient to pay  the principal, premium,
     if any, or interest so becoming due until  such sums shall be paid to  such
     Persons or  otherwise disposed of as  herein provided and the  Company will
     promptly notify the Trustee of its action or failure so to act.

           Whenever the Company shall have  one or more Paying  Agents, it will,
     one  Business Day prior to  each due date of the  principal of, premium, if
     any, or  interest  on  any  Securities, deposit  with  the  Trustee  a  sum
     sufficient to pay the  principal, premium, if any, or interest  so becoming
     due, such sum  to be held for the  benefit of the Persons entitled  to such
     principal, premium, if  any, or interest, and (unless  such Paying Agent is
     the  Trustee) the Company will  promptly notify the  Trustee of any failure
     so to act.

           The  Company will cause  each Paying Agent other  than the Trustee to
     execute  and deliver  to  the Trustee  an instrument  in which  such Paying
     Agent  shall agree  with the  Trustee,  subject to  the provisions  of this
     Section, that such Paying Agent will:

                  (1)  hold all sums held by it for the payment of the principal
           of, premium,  if any,  or interest on  Securities for the  benefit of
           the Persons entitled thereto  until such sums  shall be paid to  such
           Persons or otherwise disposed of as herein provided;


                                        - 83 -
<PAGE>






                  (2) give the Trustee notice of any default by the  Company (or
           any other obligor upon the Securities) in  the making of any  payment
           of principal, premium, if any, or interest; and

                  (3)  at any time  during the continuance of  any such default,
           upon  the  written request  of  the  Trustee,  forthwith  pay to  the
           Trustee all sums so held by such Paying Agent.

           The  Company may  at  any time,  for  the purpose  of  obtaining  the
     satisfaction and  discharge of  this Indenture  or for  any other  purpose,
     pay,  or by Company  Order direct any  Paying Agent to  pay, to the Trustee
     all sums  held in trust by the  Company or such Paying  Agent, such sums to
     be held  by the Trustee upon the same trusts as  those upon which such sums
     were held by the  Company or such Paying Agent;  and, upon such payment  by
     any Paying Agent to the Trustee, such  Paying Agent shall be released  from
     all further liability with respect to such money.

           Any money deposited  with the Trustee  or any  Paying Agent, or  then
     held  by the  Company,  in  trust for  the  payment  of the  principal  of,
     premium, if  any, or interest on  any Security and remaining  unclaimed for
     two  years after  such principal, premium,  if any, or  interest has become
     due and payable shall  be paid to  the Company on  Company Request, or  (if
     then held  by the  Company) shall be  discharged from  such trust; and  the
     Holder of such Security thereto  shall thereafter, as an  unsecured general
     creditor, look  only to the Company for payment  thereof, and all liability
     of the Trustee  or such Paying Agent with respect  to such trust money, and
     all liability of the Company as trustee thereof, shall thereupon cease.

     SECTION 10.4. Additional Amounts.
                   ------------------

           The  Company  will pay  to  the  Holder  of  any Security  Additional
     Amounts as  provided in  the form  of Security  set forth  in Section  2.2.
     Whenever  in this Indenture there is mentioned, in any context, the payment
     of the principal of,  premium, if any,  or interest on,  or in respect  of,
     any  Security, such  mention  shall be  deemed  to include  mention  of the
     payment of  Additional Amounts provided for  in this Section to  the extent
     that, in such  context,  Additional Amounts  are, were or would  be payable
     in respect thereof  pursuant to the provisions of  this Section and express
     mention  of the  payment  of Additional  Amounts  in any  provisions hereof
     shall not be  construed as excluding Additional Amounts in those provisions
     hereof where such express mention is not made.

           At least  10 days  prior to  the first  Interest Payment  Date or  an
     earlier Redemption Date or Repurchase Date (and  at least 10 days prior  to
     each date of  payment of principal, premium, if any, or interest thereafter
     if there has been any change  with respect to the matters set  forth in the
     below-mentioned  Officers'  Certificate),  the  Company  will  furnish  the
     Trustee and  the Company's  Paying Agents  in London,  England, and in  the
     Borough of  Manhattan, The  City of New  York, if  other than the  Trustee,
     with an  Officers'  Certificate instructing  the  Trustee and  such  Paying
     Agents  whether such payment of principal of,  premium, if any, or interest

                                        - 84 -
<PAGE>






     on  the  Securities   shall  be  made  to  Holders  of  Securities  without
     withholding for or  on account of any tax, assessment or other governmental
     charge  described in  the  second paragraph  of the  face  of the  forms of
     Securities  set forth in  Section 2.2.   If  any such withholding  shall be
     required,  then such  Officers'  Certificate shall  specify by  country the
     amount, if any,  required to be withheld  on such payments to  such Holders
     of Securities and the Company  will pay to the Trustee or the  Paying Agent
     in London  the Additional Amounts  required by this  Section to be paid  in
     the event of any  such withholding.  The Company covenants to indemnify the
     Trustee and any  Paying Agent for, and  to hold them harmless  against, any
     loss, liability or  expense arising  out of or  in connection with  actions
     taken or omitted  by any of them  in reliance on any  Officers' Certificate
     furnished  pursuant  to this  Section,  except  to  the  extent such  loss,
     liability or expense  is attributable to  the Trustee's  negligence or  bad
     faith.

     SECTION 10.5. Existence.
                   ---------

           Subject to  Article Seven, the Company  will do or  cause to be  done
     all things necessary  to preserve  and keep in  full force  and effect  its
     existence,  rights  (charter  and  statutory)   and  franchises;  provided,
     however, that the Company shall not be required  to preserve any such right
     or  franchise  if  the  Board   of  Directors  shall  determine   that  the
     preservation thereof is no longer  desirable in the conduct of the business
     of the  Company and  that the loss  thereof is  not disadvantageous in  any
     material respect to the Holders.

     SECTION 10.6. Maintenance of Properties.
                   -------------------------

           The  Company will cause all  properties used or useful in the conduct
     of its business  or the  business of any  Subsidiary to  be maintained  and
     kept in good  condition, repair  and working  order and  supplied with  all
     necessary equipment  and  will cause  to  be  made all  necessary  repairs,
     renewals, replacements,  betterments and  improvements thereof,  all as  in
     the judgment of  the Company may be necessary  so that the business carried
     on in connection  therewith may be properly and advantageously conducted at
     all times;  provided, however, that  nothing in this  Section shall prevent
     the Company  from discontinuing the operation or maintenance of any of such
     properties  if such  discontinuance  is, in  the  judgment of  the Company,
     desirable in the conduct  of its business or the business of any Subsidiary
     and not disadvantageous in any material respect to the Holders.

     SECTION 10.7. Payment of Taxes and Other Claims.
                   ---------------------------------

           The  Company  will  pay  or  discharge,  or  cause  to  be  paid   or
     discharged,  before  the  same  may  become  delinquent,   (1)  all  taxes,
     assessments and governmental  charges levied or imposed upon the Company or
     any Subsidiary or  upon the income, profits  or property of the  Company or
     any Subsidiary, (2) all  claims for labor, materials and supplies which, if

                                        - 85 -
<PAGE>






     unpaid,  might by  law become  a lien or  charge upon  the property  of the
     Company or  any Subsidiary, and  (3) all stamps  and other duties, if  any,
     which may be  imposed by Canada, the United States or the United Kingdom or
     any  political  subdivision  thereof  or therein  in  connection  with  the
     issuance, transfer,  exchange  or  conversion  of any  Securities  or  with
     respect to this Indenture; provided, however, that, in the case of  clauses
     (1)  and (2),  the Company  shall not  be required  to pay or  discharge or
     cause to be  paid or discharged any  such tax, assessment, charge  or claim
     whose amount,  applicability or validity  is being contested  in good faith
     by appropriate proceedings.

     SECTION 10.8. Listing.
                   -------

           The Company will use its reasonable best efforts to cause the  Common
     Shares required to be issued  and delivered upon conversion  of Securities,
     prior to  such issuance  or delivery, to  be quoted  on the American  Stock
     Exchange or,  if the  Common Shares  are not  then listed  on the  American
     Stock Exchange, cause to  be listed  the Common Shares  on a United  States
     national securities  exchange on which  Common Shares are  listed or to  be
     quoted on the Nasdaq National Market at the time of such delivery.

     SECTION 10.9. Statement by Officers as to Default.
                   -----------------------------------

           The Company shall  deliver to the Trustee  within 120 days after  the
     end of  each fiscal  year of the  Company an Officers'  Certificate stating
     that  in the course of  performance by the signers  of their duties as such
     officers of the  Company they would  normally obtain  knowledge of  whether
     any default exists in the performance and  observance of any of the  terms,
     provisions and conditions  of this Indenture  and whether  the Company  has
     kept,  observed,  performed  and  fulfilled  its   obligations  under  this
     Indenture.   Such Officers'  Certificate shall  further state,  as to  each
     such  officer  signing such  Officers'  Certificate,  to  the  best of  the
     knowledge of  such officer, as of  the date of  such Officers' Certificate,
     (a) whether any  such default exists,  (b) whether the  Company during  the
     preceding fiscal  year kept,  observed,  performed and  fulfilled each  and
     every  covenant and obligation of the  Company under this Indenture and (c)
     whether there was any default in the  performance and observance of any  of
     the  terms,  provisions,  or  conditions  of  this  Indenture  during  such
     preceding fiscal year.  If  the officers signing the  Officers' Certificate
     know of  such a  default, whether  then existing or  occurring during  such
     preceding  fiscal  year,  the Officers'  Certificate  shall  describe  such
     default and  its  status  with  particularity.    The  Company  shall  also
     promptly notify the  Trustee if  the Company's  fiscal year  is changed  so
     that  the end  thereof is on  any date  other than the  then current fiscal
     year end date.

           The  Company  will deliver  to the  Trustee, forthwith  upon becoming
     aware of  any default  in the  performance or  observance of  any covenant,
     agreement  or  condition contained  in  this  Indenture,  or  any Event  of
     Default,  an  Officers'  Certificate  specifying  with  particularity  such

                                        - 86 -
<PAGE>






     default or  Event of Default  and further  stating what action  the Company
     has taken, is taking or proposes to take with respect thereto.

           Any notice  required to  be given under  this Section  10.9 shall  be
     delivered to the Trustee at its Corporate Trust Office.

     SECTION 10.10. Delivery of Certain Information.
                    ------------------------------- 

           At any time  when the Company  is not subject to Section  13 or 15(d)
     of  the Exchange  Act  or exempt  from such  requirements pursuant  to Rule
     12g3-2(b) under  the  Exchange Act,  upon  the request  of  a Holder  of  a
     Restricted Security or the holder  of Common Shares issued  upon conversion
     thereof, the Company will  promptly furnish or cause  to be furnished  Rule
     144A  Information  (as  defined   below)  to  such  Holder   of  Restricted
     Securities or  such  holder of  Common  Shares  issued upon  conversion  of
     Restricted Securities, or to a  prospective purchaser of any  such security
     designated by any such Holder or holder, as the case may be, to  the extent
     required to  permit compliance  by such  Holder or  holder  with Rule  144A
     under  the  Securities  Act  (or   any  successor  provision  thereto)   in
     connection with  the resale of  any such security;  provided, however, that
     the  Company  shall   not  be  required  to  furnish  such  information  in
     connection with any request made on or after the date which is  three years
     from  the later of  (i) the date  such a security  (or any such predecessor
     security) was  last acquired  from  the Company  or (ii)  the date  such  a
     security  (or any  such  predecessor security)  was  last acquired  from an
     "affiliate"  of  the  Company within  the  meaning  of Rule  144  under the
     Securities  Act  (or   any  successor  provision  thereto).     "Rule  144A
     Information" shall be  such information as  is specified  pursuant to  Rule
     144A(d)(4) under the Securities Act (or any successor provision thereto).

     SECTION 10.11.  Reporting Issuer.
                     ----------------

           The Company will continue to be a  "reporting issuer" for purposes of
     Rule 903 under the Securities Act until the Restricted Period has expired.

     SECTION 10.12.  Registration Rights.
                     -------------------

           The  holders of the  Securities and  the Common  Shares issuable upon
     conversion thereof  are entitled to  the benefits of  a Registration Rights
     Agreement, dated as of May 1, 1996, between the Company and Goldman,  Sachs
     &  Co.  and  UBS Securities  LLC  (the  "Registration  Rights  Agreement").
     Pursuant to the Registration Rights  Agreement, the Company has  agreed for
     the  benefit of  the holders from  time to  time of the  Securities and the
     Common  Shares  issuable upon  conversion  thereof  that  it  will, at  its
     expense, (i) within 90 days after the  date of issuance of the  Securities,
     file a  shelf registration statement  (the "Shelf Registration  Statement")
     with the  Commission with  respect  to resales  of the  Securities and  the
     Common Shares issuable  upon conversion thereof, (ii) within 180 days after
     the date of issuance of the Securities, use its reasonable best efforts  to

                                        - 87 -
<PAGE>






     cause such Shelf  Registration Statement to  be declared  effective by  the
     Commission  and (iii)  use  its reasonable  best  efforts to  maintain such
     Shelf Registration  Statement continuously  effective under the  Securities
     Act until the third annual anniversary of the date of the effectiveness  of
     the Shelf Registration Statement  or such other date as is provided  in the
     Registration Rights Agreement.

           If  (i) on  or  prior  to 90  days  following the  date  of  original
     issuance of the  Securities, a Shelf  Registration Statement  has not  been
     filed  with the Commission, or (ii) on  or prior to the 180th day following
     the date of issuance of  the Securities, such Shelf  Registration Statement
     is  not declared  effective (each,  a  "Registration Default"),  additional
     interest   ("Special  Interest")  will accrue  on  the Securities  from and
     including the day  following such Registration Default to but excluding the
     day on  which such Registration Default  has been cured.   Special Interest
     will  be paid  semi-annually  in  arrears,  with  the  first  semi-annually
     payment  due  on  the  first  Interest  Payment  Date  in  respect  of  the
     Securities following  the date  on which  such Special  Interest begins  to
     accrue,  and will  accrue  at  a rate  per  annum  equal to  an  additional
     one-quarter  of  one  percent  (0.25%)  of  the  principal  amount  of  the
     Securities  to  and including  the  90th  day following  such  Registration
     Default  and at a rate  per annum equal to one-half  of one percent (0.50%)
     thereof from  and after the  91st day following  such Registration Default.
     In the event that the Shelf  Registration Statement ceases to be  effective
     prior to the third annual anniversary of the initial effective date of  the
     Shelf  Registration Statement  or such  other date  as is  provided in  the
     Registration  Rights Agreement for  a period in excess  of 60 days, whether
     or not  consecutive, during  any 12-month  period, then  the interest  rate
     borne by the  Securities shall increase  by an  additional one-half of  one
     percent (0.50%)  per  annum on  the  61st day  of  the applicable  12-month
     period such  Shelf Registration  Statement ceases  to be  effective to  but
     excluding the day on which  the Shelf Registration Statement  again becomes
     effective.

           Whenever in  this Indenture there is  mentioned, in  any context, the
     payment of  the  principal of,  premium,  if any,  or  interest on,  or  in
     respect of, any Security,  such mention shall be deemed to  include mention
     of the  payment of  Special Interest provided  for in  this Section to  the
     extent that, in such  context, Special Interest is, was or would be payable
     in respect thereof pursuant to  the provisions of this Section  and express
     mention  of  the  payment  of  Special  Interest  (if  applicable)  in  any
     provisions hereof shall not be  construed as excluding Special  Interest in
     those provisions hereof where such express mention is not made.

           In  the   event  of  any  amendment   to  or   modification  of,  the
     Registration  Rights Agreement,  the  Company  shall promptly  provide  the
     Trustee with a copy of such amendment or modification.






                                        - 88 -
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     SECTION 10.13.  Waiver of Certain Covenants.
                     ---------------------------

           The Company may  omit in any particular  instance to comply with  any
     covenant or  conditions  set forth  in  Sections  10.5 to  10.7,  inclusive
     (other  than a covenant  or condition  which under Article  Eight cannot be
     modified or amended without the  consent of the Holder of  each Outstanding
     Security affected),  if before  the time  for such  compliance the  Holders
     shall, through the written consent of, or  the adoption of a resolution  at
     a meeting of Holders  of the  Outstanding Securities at  which a quorum  is
     present  by,  not  less  than  a  majority  in  principal  amount   of  the
     Outstanding Securities,  either waive such  compliance in such instance  or
     generally waive compliance  with such covenant  or condition,  but no  such
     waiver shall extend to  or affect such covenant or condition except  to the
     extent so expressly  waived, and, until such waiver shall become effective,
     the obligations of  the Company and the duties of the Trustee or any Paying
     or Conversion  Agent in  respect of  any such  covenant or  condition shall
     remain in full force and effect.


                                    ARTICLE ELEVEN

                               REDEMPTION OF SECURITIES


     SECTION 11.1. Right of Redemption.
                   -------------------

           The Securities may be redeemed in  accordance with the provisions  of
     the forms of Securities set forth in Section 2.2.

     SECTION 11.2.  Applicability of Article.
                    ------------------------

           Redemption  of  Securities   at  the  election  of  the  Company   or
     otherwise, as  permitted or required by any provision  of the Securities or
     this Indenture,  shall be made in  accordance with such provision  and this
     Article Eleven.

     SECTION 11.3.  Election to Redeem; Notice to Trustee.
                    -------------------------------------

           The  election  of the  Company  to  redeem  any  Securities shall  be
     evidenced  by a  Board  Resolution.   In  case  of  any redemption  at  the
     election  of the Company  of any of the  Securities, the  Company shall, at
     least 60 days prior to  the Redemption Date fixed by the Company  (unless a
     shorter notice  shall be satisfactory  to the Trustee),  notify the Trustee
     in writing  of such Redemption Date.  If the  Securities are to be redeemed
     pursuant  to an election  of the  Company which  is subject to  a condition
     specified in the forms of Securities set forth  in Section 2.2, the Company
     shall furnish  the Trustee with  an Officers' Certificate  stating that the
     Company  is  entitled  to  effect  such  redemption  and  setting  forth  a

                                        - 89 -
<PAGE>






     statement of facts showing  that the conditions  precedent to the right  of
     the Company so to redeem have occurred.

     SECTION 11.4.  Selection by Trustee of Securities to Be Redeemed.
                    -------------------------------------------------

           If  less than  all the  Securities  are  to be  redeemed (other  than
     pursuant to the third  paragraph on the reverse of the  form of Security in
     Section 2.2),  the particular Securities  to be redeemed  shall be selected
     by  the  Trustee within  two Business  Days  after it  receives  the notice
     described in  11.3, from the Outstanding  Securities not  previously called
     for redemption,  on a pro rata basis  or by such method  as the Trustee may
     deem appropriate.   Partial redemption must be  in an amount not  less than
     U.S.$1,000,000 principal amount of Securities.

           If any Security selected for partial  redemption is converted in part
     before termination of  the conversion right with respect  to the portion of
     the Security so selected, the  converted portion of such Security  shall be
     deemed (so  far as  may  be) to  be the  portion selected  for  redemption.
     Securities which  have been converted  during a selection  of Securities to
     be redeemed may  be treated by the  Trustee as Outstanding for  the purpose
     of such selection.

           The  Trustee  shall promptly  notify  the  Company and  each Security
     Registrar in writing of the  securities selected for redemption and, in the
     case  of any  Securities  selected for  partial  redemption, the  principal
     amount thereof to be redeemed.

           For all  purposes of  this Indenture,  unless  the context  otherwise
     requires, all  provisions relating  to the  redemption of Securities  shall
     relate, in the  case of any Securities  redeemed or to be  redeemed only in
     part, to the portion  of the principal amount of such Securities  which has
     been or is to be redeemed.

     SECTION 11.5.  Notice of Redemption.
                    --------------------

           Notice  of  redemption shall  be  given  in  the  manner provided  in
     Section 1.6 to the  Holders of Securities to  be redeemed not less  than 30
     nor  more than 60 days prior to the  Redemption Date, and such notice shall
     be irrevocable.

           All notices of redemption shall state:

                  (1) the Redemption Date,

                  (2) the Redemption Price,

                  (3)  if  less  than  all  Outstanding  Securities  are  to  be
           redeemed,  the  aggregate  principal  amount  of  Securities  to   be
           redeemed and the aggregate principal  amount of Securities which will
           be outstanding after such partial redemption,

                                        - 90 -
<PAGE>






                  (4) that  on  the Redemption  Date the  Redemption Price,  and
           accrued interest, if any, will become due  and payable upon each such
           Security  to be redeemed,  and that  interest thereon  shall cease to
           accrue on and after said date,

                  (5)  the  Conversion Price,  the  date on  which the  right to
           convert the Securities to be redeemed  will terminate and the  places
           where such Securities may be surrendered for conversion, and

                  (6)  the place  or  places where  such  Securities are  to  be
           surrendered  for  payment   of  the  Redemption  Price  and   accrued
           interest, if any.

           In  case  of a  partial  redemption,  the  first  notice given  shall
     specify the last date  on which exchanges or transfers of Securities may be
     made  pursuant  to  Section 3.5  and  shall  specify the  serial  and CUSIP
     numbers (if any), ISIN number (if any) and  the portions thereof called for
     redemption.

           Notice of redemption of Securities to be redeemed at the election  of
     the Company shall  be given  by the Company  or, at  the Company's  written
     request, by the Trustee  in the name of and at  the expense of the Company.
     Notice of redemption  of Securities to be  redeemed at the election  of the
     Company received  by the  Trustee shall  be given  by the  Trustee to  each
     Paying Agent in the name of and at the expense of the Company.

     SECTION 11.6.  Deposit of Redemption Price.
                    ---------------------------

           Not  less than one  Business Day  prior to  any Redemption  Date, the
     Company shall deposit  with the Trustee or with  the Paying Agent in London
     if  so directed by  the Trustee  (or, if the  Company is acting  as its own
     Paying Agent, segregate and hold in trust  as provided in Section 10.3)  an
     amount of money  (which shall  be in  immediately available  funds on  such
     Redemption Date) sufficient  to pay the Redemption Price of, and (except if
     the Redemption Date  shall be an  Interest Payment  Date) accrued  interest
     on,  all the Securities  which are to  be redeemed on  that date other than
     any  Securities  called  for  redemption  on  that  date  which  have  been
     converted prior to the date of such deposit.

           If  any  Security  called  for  redemption  is converted,  any  money
     deposited with the  Trustee or  with a Paying  Agent or  so segregated  and
     held in trust for  the redemption  of such Security  shall (subject to  any
     right of  the Holder of  such Security, if  a Security, or any  Predecessor
     Security to receive interest  as provided in the last  paragraph of Section
     3.7)  be paid to  the Company  on Company Request  or, if then  held by the
     Company, shall be discharged from such trust.






                                        - 91 -
<PAGE>






     SECTION 11.7.  Securities Payable on Redemption Date.
                    -------------------------------------

           Notice  of redemption having  been given as aforesaid, the Securities
     so to be redeemed shall, on the Redemption Date, become due and payable  at
     the  Redemption  Price therein  specified  and  from  and  after such  date
     (unless the Company shall default  in the payment of the  Redemption Price,
     including accrued interest)  such Securities shall cease to  bear interest.
     Upon  surrender of  any  Security for  redemption  in accordance  with said
     notice, maturing after the Redemption Date, such Security  shall be paid by
     the Company  at  the Redemption  Price  together  with accrued  and  unpaid
     interest to  the Redemption Date;  provided, however, that installments  of
     interest  on Securities  whose  Stated Maturity  is  on  or, prior  to  the
     Redemption Date shall be payable to the Holders  of such Securities, or one
     or more Predecessor Securities, registered  as such on the  relevant Record
     Date according to their terms and the provisions of Section 3.7.

           If any  Security called  for redemption  shall  not be  so paid  upon
     surrender thereof  for redemption,  the  principal amount  of, premium,  if
     any, and,  to the extent permitted  by applicable law, accrued  interest on
     such Security shall, until paid, bear interest from  the Redemption Date at
     a rate of  6.50% per annum and such  Security shall remain convertible into
     Common  Shares until the principal of such Security (or portion thereof, as
     the case may be) shall have been paid or duly provided for.

     SECTION 11.8.  Securities Redeemed in Part.
                    ---------------------------

           Any  Security  which  is  to  be  redeemed  only  in  part  shall  be
     surrendered at  an office  or agency  of the  Company  designated for  that
     purpose pursuant to  Section 10.2 (with, if  the Company or the  Trustee so
     requires, due endorsement by, or  a written instrument of transfer in  form
     satisfactory to  the Company and  the Trustee duly executed  by, the Holder
     thereof  or his attorney duly authorized in writing), and the Company shall
     execute,  and  the  Trustee  shall  authenticate  and  make  available  for
     delivery  to the  Holder of  such Security  without service  charge,  a new
     Security or  Securities, of  any  authorized denomination  as requested  by
     such Holder,  in aggregate  principal amount equal  to and in  exchange for
     the unredeemed portion of the principal of the Security so surrendered.


                                    ARTICLE TWELVE

                               CONVERSION OF SECURITIES

     SECTION 12.1.  Conversion Privilege and Conversion Price.
                    -----------------------------------------

           Subject to and upon compliance with  the provisions of this  Article,
     at the  option of the  Holder thereof, any  Security may be converted  into
     fully paid  and nonassessable shares  (calculated as to  each conversion to
     the nearest  1/100th of a  share) of  Common Shares of  the Company  at the

                                        - 92 -
<PAGE>






     Conversion Price,  determined as  hereinafter  provided, in  effect at  the
     time of conversion.  Such conversion right shall  commence on the latest of
     the commencement of the  Sale of the Securities, the original issue date of
     the  Securities  and   the  issue  date  with  respect  to  any  additional
     Securities issued  to  cover overallotments  and  expire  at the  close  of
     business  on May  1, 2003, subject,  in the case  of the  conversion of any
     Global Security, to any  applicable book-entry procedures of the Depositary
     therefor.  In case  a Security or portion thereof is called  for redemption
     or is  delivered for repurchase,  such conversion right  in respect of  the
     Security or portion so called shall expire at the close of business  on the
     Redemption Date  or the Repurchase  Date (as defined  in Article Fourteen),
     as the case may  be, unless the Company defaults in making  the payment due
     upon redemption or repurchase, as the case may be.

           The price at  which shares of Common  Shares shall be delivered  upon
     conversion  (herein  called  the "Conversion  Price")  shall  be  initially
     U.S.$24.858 per Common  Share.  The  Conversion Price shall be  adjusted in
     certain instances as provided in this Article Twelve.

     SECTION 12.2.  Exercise of Conversion Privilege.
                    --------------------------------

           In order  to exercise  the conversion  privilege, the  Holder of  any
     Security to  be converted shall  surrender such Security,  duly endorsed or
     assigned  to the  Company  or  in blank  (in  the  case of  any  Definitive
     Security),  at any  office or  agency of  the Company  maintained for  that
     purpose pursuant to Section 10.2,  accompanied by a duly  signed conversion
     notice  substantially in the  form set  forth in  Annex A-1 or  A-2 stating
     that  the Holder  elects to  convert such  Security  or, if  less than  the
     entire principal amount thereof  is to be converted, the portion thereof to
     be converted.   Each Security  surrendered for conversion  (in whole or  in
     part) during the  period from the close  of business on any  Regular Record
     Date to the  opening of  business on the  next succeeding Interest  Payment
     Date (except Securities called  for redemption on  a Redemption Date or  to
     be repurchased  on a Repurchase  Date during,  in each  case, such  period)
     shall be accompanied by payment in New  York Clearing House funds or  other
     funds acceptable to the Company of an amount equal to the interest  payable
     on such Interest Payment Date on the principal  amount of such Security (or
     part thereof, as  the case may be)  being surrendered for conversion.   The
     interest  so payable  on  such Interest  Payment  Date in  respect of  such
     Security  (or  portion  thereof,  as  the  case  may  be)  surrendered  for
     conversion shall be  paid to the Holder of such Security as of such Regular
     Record Date.  Interest payable  in respect of any Security surrendered  for
     conversion  on or  after an  Interest Payment  Date  shall be  paid to  the
     Holder  of such  Security as  of  the next  preceding Regular  Record Date,
     notwithstanding  the  exercise of  the  right  of  conversion.   Except  as
     provided in this  paragraph and subject  to the last  paragraph of  Section
     3.7,  no cash payment  or adjustment shall be  made upon  any conversion on
     account of, if the date of conversion is not an Interest Payment  Date, any
     interest  accrued  from  the  Interest  Payment  Date  next  preceding  the
     conversion date, in respect of any Security  (or part thereof, as the  case
     may be) surrendered  for conversion, or on account  of any dividends on the

                                        - 93 -
<PAGE>






     Common Shares  issued  upon conversion.    The  Company's delivery  to  the
     Holder  of the  number of  Common Shares  (and  cash in  lieu of  fractions
     thereof,  as  provided   in  this  Indenture)  into  which  a  Security  is
     convertible will be deemed  to satisfy the Company's obligation to  pay the
     principal amount of the Security.

           Securities  shall be deemed to have been  converted immediately prior
     to the  close of business  on the day  of surrender of such  Securities for
     conversion in  accordance with the  foregoing provisions, and  at such time
     the rights of  the Holders of such  Securities as Holders shall  cease, and
     the Person  or Persons entitled to receive  the Common Shares issuable upon
     conversion shall  be  treated for  all  purposes as  the record  holder  or
     holders  of such Common Shares at such time.  As promptly as practicable on
     or after the  conversion date, the Company  shall issue and deliver  to the
     Trustee, for delivery  to the Holders,  a certificate  or certificates  for
     the number  of full Common  Shares issuable upon  conversion, together with
     payment in lieu of any fraction of a share, as provided in Section 12.3.

           All  Common  Shares delivered  upon  such  conversion  of  Restricted
     Securities shall bear  restrictive legends substantially in the form of the
     legends required to be set  forth on the Restricted Securities pursuant  to
     Section 2.4  and shall be subject to  the restrictions on transfer provided
     in such  legends.   Neither the Trustee  nor any  agent maintained for  the
     purpose of such  conversion shall have any responsibility for the inclusion
     or  content  of  any  such  restrictive  legends  on  such  Common  Shares;
     provided,  however,  that the  Trustee  or  any  agent  maintained for  the
     purpose of such  conversion shall have provided,  to the Company or  to the
     Company's transfer agent for such  Common Shares, prior to  or concurrently
     with  a request  to  the Company  to  deliver such  Common Shares,  written
     notice  that  the  Securities  delivered  for   conversion  are  Restricted
     Securities.

           In the  case of any  Security which is  converted in  part only, upon
     such  conversion  the   Company  shall  execute  and   the  Trustee   shall
     authenticate  and deliver  to the  Holder thereof,  at  the expense  of the
     Company, a new  Security or Securities  of authorized  denominations in  an
     aggregate  principal  amount  equal  to  the  unconverted  portion  of  the
     principal amount of  such Security.  A  Security may be converted  in part,
     but only if the  principal amount of such  Security to be converted  is any
     integral multiple of U.S.$1,000.

     SECTION 12.3.  Fractions of Shares.
                    -------------------

           No fractional  Common Shares shall be  issued upon  conversion of any
     Securities.  If  more than one Security shall be surrendered for conversion
     at one  time by the same Holder,  the number of full  shares which shall be
     issuable upon  conversion thereof  shall be  computed on the  basis of  the
     aggregate  principal  amount  of  the  Securities  (or  specified  portions
     thereof)  so surrendered.    Instead of  any  fractional share  which would
     otherwise be  issuable  upon conversion  of  any Securities  (or  specified
     portions thereof),  the Company shall  calculate and pay  a cash adjustment

                                        - 94 -
<PAGE>






     in respect of such fraction (calculated to the nearest 1/100th of a  share)
     in  an amount equal  to the same fraction  of the current  market price per
     share  of Common  Shares  (calculated in  accordance  with Section  12.4(8)
     below) at the close of business on the day of conversion.

     SECTION 12.4.  Adjustment of Conversion Price.
                    ------------------------------

           The  Conversion Price shall  be subject  to adjustments  from time to
     time as follows:

           (1)   In  case the  Company shall  pay or  make a  dividend or  other
     distribution  on  any class  of  capital stock  of  the Company  payable in
     Common Stock, the Conversion Price in effect at  the opening of business on
     the day  following the  date fixed  for the  determination of  stockholders
     entitled to  receive such dividend  or other distribution  shall be reduced
     by multiplying such  Conversion Price by a fraction  of which the numerator
     shall be  the number of shares of Common  Stock outstanding at the close of
     business  on the  date  fixed for  such  determination and  the denominator
     shall  be the sum of such  number of shares and the  total number of shares
     constituting such dividend or other distribution,  such reduction to become
     effective immediately  after the opening  of business on  the day following
     the date fixed for such determination.  For  the purposes of this paragraph
     (1),  the number of  shares of Common Stock  at any  time outstanding shall
     not include shares  held in the treasury  of the Company but  shall include
     shares issuable  in  respect  of  scrip  certificates  issued  in  lieu  of
     fractions  of shares  of  Common  Stock.   The  Company  will not  pay  any
     dividend or make any  distribution on  shares of Common  Stock held in  the
     treasury of the Company.

           (2)  In case  the Company shall issue  rights, options or warrants to
     all holders of  any class of Common  Stock entitling them to  subscribe for
     or purchase shares of any class  of Common Stock at a price  per share less
     than the  current  market  price  per  share  (determined  as  provided  in
     paragraph  (8) of this Section)  of such class of Common  Stock on the date
     fixed  for  the  determination  of shareholders  entitled  to  receive such
     rights, options or warrants, the Conversion Price  in effect at the opening
     of business  on the  day following  the date  fixed for such  determination
     shall be  reduced by  multiplying such  Conversion Price  by a  fraction of
     which  the  numerator  shall  be  the  number  of  shares  of  Common Stock
     outstanding  at  the  close   of  business  on  the  date  fixed  for  such
     determination  plus  the  number  of  shares  of  Common  Stock  which  the
     aggregate of the offering  price of  the total number  of shares of  Common
     Stock so  offered  for subscription  or  purchase  would purchase  at  such
     current market price and the denominator shall  be the number of shares  of
     Common Stock outstanding at  the close  of business on  the date fixed  for
     such determination plus  the number of  shares of Common  Stock so  offered
     for  subscription  or  purchase,    such   reduction  to  become  effective
     immediately after  the opening  of business on  the day following  the date
     fixed for such determination.  For the purposes  of this paragraph (2), the
     number of shares of  Common Stock at any time outstanding shall not include
     shares  held  in the  treasury  of the  Company  but  shall include  shares

                                        - 95 -
<PAGE>






     issuable in respect of  scrip certificates issued  in lieu of fractions  of
     shares of Common Stock.  The Company will not issue any  rights, options or
     warrants in respect of shares  of Common Stock held in the  treasury of the
     Company.

           (3)  In case  outstanding shares of any  class of Common  Stock shall
     be subdivided  into a  greater number  of shares  of such  class of  Common
     Stock,  and, conversely, in case outstanding shares  of any class of Common
     Stock shall each be combined into a  smaller number of shares of such class
     of Common Stock, the Conversion Price in effect at the opening of  business
     on the day following the day upon which such combination  becomes effective
     shall be  adjusted by the Company  so that the  same shall equal  the price
     determined by multiplying the Conversion Price in  effect immediately prior
     to the effectiveness  of the  Conversion Price  adjustment contemplated  by
     this  subparagraph (3) by  a fraction of which  the numerator  shall be the
     number of  shares of  Common Stock  outstanding immediately  prior to  such
     subdivision  or combination  and  the denominator  shall  be the  number of
     shares of Common  Stock outstanding immediately after giving effect to such
     subdivision   or   combination,  such   adjustment   to  become   effective
     immediately after  the opening  of business  on the day  following the  day
     upon which such subdivision or combination becomes effective.

           (4)  In case the  Company shall, by dividend or otherwise, distribute
     to all  holders of its Common  Stock evidences of  its indebtedness, shares
     of any class of capital stock, cash or other assets or property  (including
     securities, but excluding (i) any  rights, options or warrants  referred to
     in  paragraph (2) of  this Section, (ii) any  dividend or distribution paid
     exclusively in  cash, (iii)  any dividend  or distribution  referred to  in
     paragraph (1) of this Section  and (iv) any amalgamation,  consolidation or
     merger  to which  Section  12.11 applies),  the  Conversion Price  shall be
     adjusted so that the  same shall equal the price determined  by multiplying
     the Conversion Price in effect  immediately prior to the close of  business
     on  the  date fixed  for  the  determination  of  stockholders entitled  to
     receive such distribution by  a fraction of  which (i) the numerator  shall
     be the current  market price per share (determined as provided in paragraph
     (8) of  this Section) of the  Common Shares on the  third Trading Day prior
     to the  date fixed for such  determination (the "Reference Date")  less the
     then fair  market value  (as determined  by the  Board of Directors,  whose
     determination  shall be  conclusive  and described  in  a Board  Resolution
     filed  with  the Trustee)  on  the Reference  Date  of the  portion  of the
     assets, shares or  evidences of  indebtedness so distributed  applicable to
     one Common Share and  the denominator shall be the current market price per
     Common Share on  the Reference Date,  such adjustment  to become  effective
     immediately  prior to  the  opening of  business on  the day  following the
     Reference  Date.   If the  Board  of Directors  determines the  fair market
     value of  any  distribution  for  purposes  of  this  subparagraph  (4)  by
     reference to the actual  or when issued trading  market for any  securities
     comprising such  distribution, it must in  doing so consider the  prices in
     such market over the same period used in computing 12.5% of the  average of
     the  current  market prices  per  share of  Common Share  pursuant  to this
     subparagraph (4).  For purposes  of this subparagraph (4), any  dividend or
     distribution  that  includes  Common   Shares  or  rights  or  warrants  to

                                        - 96 -
<PAGE>






     subscribe for or purchase  shares of Common Shares shall  be deemed instead
     to be  (1) a dividend  or distribution  of the  evidences of  indebtedness,
     shares of capital  stock, cash or assets  other than such shares  of Common
     Shares or  such rights or  warrants (making any  Conversion Price reduction
     required by this subparagraph (4))  immediately followed by (2)  a dividend
     or  distribution of Common  Shares or  such rights or  warrants (making any
     further Conversion Price  reduction required by subparagraph  (1) or  (2)),
     except  (x) the Reference Date of such  dividend or distribution as defined
     in this subparagraph (4) shall be substituted  in place of the phrases  (a)
     "the date fixed for the  determination of stockholders entitled  to receive
     such  dividend or  other  distribution" and  (b) "the  date fixed  for such
     determination"  within   the  meaning   of  subparagraphs   (1)  and   (2),
     respectively, of  this Section 12.4  and (y)  any shares  of Common  Shares
     included in such  dividend or distribution shall not be deemed "outstanding
     at the close of business on the  date fixed for such determination"  within
     the meaning of subparagraph (1) of this Section 12.4.

           (5)  In case the Company  shall, by dividend or otherwise, distribute
     to all holders  of any class of its  Common Stock cash (excluding  any cash
     that is distributed upon  a merger or consolidation to which  Section 12.11
     applies or as part  of a distribution referred to in  paragraph (4) of this
     Section) in  an  aggregate amount  that,  combined  together with  (I)  the
     aggregate amount of  any other  cash distributions  to all  holders of  any
     class  of its Common  Stock made exclusively in  cash within  the 12 months
     preceding the date of payment of such distribution and in respect of  which
     no adjustment  pursuant to this  paragraph (5) has  been made and (II)  the
     aggregate of any  cash plus  the fair market  value (as  determined by  the
     Board of Directors,  whose determination shall be  conclusive and described
     in  a Board Resolution) of  consideration payable in  respect of any tender
     offer by the Company or any of its  subsidiaries for all or any portion  of
     any class of the Common Stock concluded within the 12 months preceding  the
     date of payment of such distribution and in  respect of which no adjustment
     pursuant to paragraph (6) of this Section  has been made, exceeds 12.5%  of
     the product of the current  market price per Common  Share on the date  for
     the determination  of holders  of Common  Shares entitled  to receive  such
     distribution times  the number  of shares of  all classes  of Common  Stock
     outstanding on  such date, then, and  in each such case,  immediately after
     the close of business on such date for determination,  the Conversion Price
     shall be adjusted  so that  the same shall  equal the  price determined  by
     multiplying the Conversion Price in  effect immediately prior to  the close
     of  business  on the  date  fixed  for  determination  of the  stockholders
     entitled to  receive such distribution by  a fraction (i) the  numerator of
     which shall be  equal to the current market  price per share (determined as
     provided in  paragraph (8)  of this Section)  of the  Common Shares on  the
     date fixed for such determination less an  amount equal to the quotient  of
     (x) the excess of such  combined amount over such 12.5% and (y)  the number
     of shares  of all  classes of  Common Stock  outstanding on  such date  for
     determination  and (ii)  the denominator  of which  shall be  equal to  the
     current market price per share (determined as provided in  paragraph (8) of
     this Section) of the Common Shares on such date for determination.



                                        - 97 -
<PAGE>






           (6)   In  case  a  tender or  exchange offer  (other than  an odd-lot
     offer) made by the Company  or any Subsidiary for all or any portion of any
     class of Common Stock  shall expire and such tender or exchange offer shall
     involve the payment by the Company or  such Subsidiary of consideration per
     share  of such  class  of  Common Stock  having  a  fair market  value  (as
     determined in good  faith by the  Board of  Directors, whose  determination
     shall be conclusive  and described in a Board  Resolution) at the last time
     (the  "Expiration Time") tenders or exchanges may  be made pursuant to such
     tender or exchange offer  (as it shall have been amended) that exceeds 110%
     of the current market price per share (determined  as provided in paragraph
     (8) of this  Section) of such class  of Common Stock as of  the Trading Day
     next succeeding the  Expiration Time, the Conversion Price shall be reduced
     so  that  the same  shall  equal the  price  determined by  multiplying the
     Conversion Price  in effect immediately  prior to the  effectiveness of the
     Conversion Price  reduction  contemplated by  this  subparagraph (6)  by  a
     fraction of which  the numerator shall  be the sum  of the products of  the
     number of shares  of each class of Common  Stock outstanding (including any
     tendered or  exchanged shares)  at the  Expiration Time  multiplied by  the
     respective  current market  price  per  share  (determined as  provided  in
     paragraph (8) of this  Section) of each such  class of Common Stock on  the
     Trading Day next succeeding the  Expiration Time and the  denominator shall
     be  the sum of (x)  the fair market value (determined  as aforesaid) of the
     aggregate consideration  payable to  stockholders based  on the  acceptance
     (up to any maximum  specified in the terms of the tender or exchange offer)
     of all shares validly  tendered or  exchanged and not  withdrawn as of  the
     Expiration Time  (the shares deemed  so accepted, up  to any such  maximum,
     being  referred to  as  the " Purchased  Shares") and  (y)  the sum  of the
     products of the number of shares of each class of Common Stock  outstanding
     (less  any Purchased  Shares)  at the  Expiration  Time and  the respective
     current market price per  share (determined as provided in paragraph (8) of
     this Section) of  each such class of  Common Stock on the  Trading Day next
     succeeding  the  Expiration  Time,  such  reduction   to  become  effective
     immediately  prior to  the  opening of  business on  the day  following the
     Expiration Time.

           (7)    The  reclassification  of  any  class  of  Common  Stock  into
     securities   including   other   than  Common   Stock   (other   than   any
     reclassification  upon a  amalgamation, consolidation  or  merger to  which
     Section  12.11 applies) shall  be deemed  to involve (a)  a distribution of
     such  securities other than  Common Stock  to all  holders of  Common Stock
     (and  the effective  date of such  reclassification shall  be deemed  to be
     "the date fixed for the  determination of stockholders entitled  to receive
     such distribution" and "the date  fixed for such determination"  within the
     meaning of  paragraph  (4)  of this  Section),  and  (b) a  subdivision  or
     combination, as the case  may be, of the number of shares of  such class of
     Common Stock  outstanding immediately prior  to such reclassification  into
     the  number of  shares of Common  Stock outstanding  immediately thereafter
     (and the  effective date  of such  reclassification shall be  deemed to  be
     "the  day upon which  such subdivision becomes effective"  or "the day upon
     which  such combination becomes  effective", as  the case may  be, and "the
     day  upon which such subdivision  or combination  becomes effective" within
     the meaning of paragraph (3) of this Section).

                                        - 98 -
<PAGE>






           (8)   For the purpose  of any computation  under paragraphs (2), (4),
     (5) or (6) of  this Section 12.4, the current  market price per share  of a
     class  of Common Stock on any  date shall be calculated  by the Company and
     be deemed  to be the average of the  daily Closing Prices Per Share of such
     class  for  the five  consecutive  Trading  Days  selected  by the  Company
     commencing not  more than  10  Trading Days  before, and  ending not  later
     than, the earlier of the day  in question and the day before the "ex"  date
     with respect  to the issuance  or distribution requiring such  computation.
     For  purposes of  this paragraph,  the  term "'ex'  date",  when used  with
     respect  to any  issuance or  distribution, means  the first date  on which
     such class of Common Stock trades regular way in the  applicable securities
     market or  on  the applicable  securities  exchange  without the  right  to
     receive such issuance or distribution

           (9)  No adjustment  in the Conversion Price shall be required  unless
     such adjustment  (plus any  adjustments not  previously made  by reason  of
     this paragraph (9)) would  require an increase or decrease of at  least one
     percent in such  price; provided, however,  that any  adjustments which  by
     reason of this paragraph (9) are not  required to be made shall be  carried
     forward  and  taken  into  account  in  any  subsequent  adjustment.    All
     calculations  under this Article  shall be made to  the nearest  cent or to
     the nearest one-hundredth of a share, as the case may be.

           (10)  The Company may make such  reductions in the Conversion  Price,
     for the remaining  term of the Securities or  any shorter term, in addition
     to  those required by  paragraphs (1), (2),  (3), (4), (5) and  (6) of this
     Section  12.4, as  it  considers  to be  advisable  in  order to  avoid  or
     diminish any income tax to any holders of Common Shares resulting from  any
     dividend  or distribution of  stock or  issuance of  rights or  warrants to
     purchase or  subscribe for  stock or  from any  event treated  as such  for
     income tax purposes.

     SECTION 12.5.  Notice of Adjustments of Conversion Price.
                    -----------------------------------------

           Whenever the Conversion Price is adjusted as herein provided:

                  (1) the  Company shall  compute the adjusted  Conversion Price
           in  accordance with  Section 12.4  and  shall prepare  a  certificate
           signed  by the Treasurer  of the  Company setting  forth the adjusted
           Conversion  Price and  showing  in reasonable  detail the  facts upon
           which such adjustment is based,  and such certificate  shall promptly
           be filed with the Trustee and with each Conversion Agent; and

                  (2) a  notice  stating  that the  Conversion  Price  has  been
           adjusted  and  setting forth  the  adjusted  Conversion  Price  shall
           forthwith  be  required, and  as  soon  as  practicable  after it  is
           required,  such  notice shall  be  provided  by  the  Company to  all
           Holders in accordance with Section 1.6.

     Neither  the Trustee nor  any Conversion Agent shall  be under  any duty or
     responsibility with respect  to any such certificate or the information and

                                        - 99 -
<PAGE>






     calculations contained  therein, except to  exhibit the same  to any Holder
     of  Securities desiring  inspection  thereof at  its  office during  normal
     business hours.

     SECTION 12.6.  Notice of Certain Corporate Action.
                    ----------------------------------

           In case:

                  (a) the  Company  shall  declare  a  dividend  (or  any  other
           distribution) on any class of its  Common Stock payable (i) otherwise
           than exclusively  in cash or  (ii) exclusively  in cash in  an amount
           that would require any adjustment pursuant to Section 12.4; or

                  (b)  the Company  shall authorize the granting  to the holders
           of any class of  its Common Stock  of rights, options or warrants  to
           subscribe for or purchase  any shares of  capital stock of any  class
           or of any other rights; or

                  (c)  of any reclassification  of any class of  Common Stock of
           the  Company  (other  than  a  subdivision  or  combination  of   its
           outstanding  shares  of  Common  Stock),  or  of  any   amalgamation,
           consolidation  or merger  to which  the  Company is  a party  and for
           which approval of any stockholders of the  Company is required, or of
           the  sale or transfer  of all  or substantially all of  the assets of
           the Company; or

                  (d) of the voluntary  or involuntary dissolution,  liquidation
           or winding up of the Company; or

                  (e) the  Company or  any Subsidiary  shall commence  a  tender
           offer for all or a portion of any class of the Company's  outstanding
           shares of Common Stock (or shall amend any such tender offer);

     then  the  Company shall  cause  to  be  filed  at each  office  or  agency
     maintained for the  purpose of conversion of Securities pursuant to Section
     10.2,  and shall cause  to be  provided to  all Holders in  accordance with
     Section 1.6, at least  20 days (or 10 days in any case  specified in clause
     (a) or (b)  above) prior to the applicable  record, expiration or effective
     date  hereinafter specified,  a  notice stating  (x)  the date  on which  a
     record is  to be  taken for  the purpose  of  such dividend,  distribution,
     rights, options or warrants, or, if  a record is not to be taken, the  date
     as of which the holders  of Common Stock of  record to be entitled to  such
     dividend, distribution, rights,  options or warrants are to  be determined,
     (y) the  date on which  the right to  make tenders under  such tender offer
     expires or  (z) the  date  on which  such reclassification,  consolidation,
     merger,  share  exchange, conveyance,  transfer, sale,  lease, dissolution,
     liquidation or winding up  is expected to become effective, and the date as
     of which  it is expected  that holders of Common  Stock of record  shall be
     entitled to exchange  their shares of Common Stock  for securities, cash or
     other  property  deliverable  upon  such  reclassification,  consolidation,
     merger,  share exchange,  conveyance, transfer,  sale, lease,  dissolution,

                                       - 100 -
<PAGE>






     liquidation or  winding up.   If at the  time the Trustee shall  not be the
     conversion agent, a copy of such  notice and any notice referred to in  the
     following paragraph  shall also forthwith be filed by  the Company with the
     Trustee.

     SECTION 12.7.  Company to Reserve Common Shares.
                    --------------------------------

           The Company shall at all times reserve and keep available, free  from
     preemptive rights,  out of its  authorized but unissued  Common Shares, for
     the purpose  of effecting the conversion of  Securities, the full number of
     Common  Shares  then  issuable  upon  the  conversion  of  all  Outstanding
     Securities.

     SECTION 12.8.  Taxes on Conversions.
                    --------------------

           The Company will pay any and all transfer  taxes and duties that  may
     be  payable in  respect  of  the issue  or  delivery  of Common  Shares  on
     conversion of Securities  pursuant hereto.  The Company shall not, however,
     be  required to pay any tax or duty which  may be payable in respect of any
     transfer  involved in the  issue and  delivery of  Common Shares in  a name
     other  than  that of  the  Holder  of  the  Security or  Securities  to  be
     converted,  and no such  issue or delivery shall  be made  unless and until
     the Person requesting such issue has paid to the  Company the amount of any
     such tax  or duty, or  has established to  the satisfaction of the  Company
     that such tax or duty has been  paid.  Such taxes payable shall not include
     any income, capital taxes payable by a Holder by reason of such  conversion
     in any jurisdiction, with which such Holder has  a connection other than by
     reason of acquiring or converting the Securities.

     SECTION 12.9.  Covenant as to Common Shares.
                    ----------------------------

           The Company  agrees that  all Common  Shares which  may be  delivered
     upon conversion  of Securities,  upon such  delivery, will  have been  duly
     authorized and  validly issued  and will  be fully  paid and  nonassessable
     and, except as  provided in Section 12.8,  the Company will pay  all taxes,
     liens and charges  with respect to the  issue thereof.  Such  taxes payable
     shall not include  any income, capital taxes payable  by a Holder by reason
     of such  conversion  in any  jurisdiction,  with which  such  Holder has  a
     connection other than by reason of acquiring or converting the Securities.

     SECTION 12.10.  Cancellation of Converted Securities.
                     ------------------------------------

           All  Securities delivered for  conversion shall  be delivered  to the
     Trustee or the Paying Agent in  London or its agent to be canceled by or at
     the direction of  the Trustee, which shall dispose  of the same as provided
     in Section 3.9.



                                       - 101 -
<PAGE>






     SECTION 12.11.  Provision in Case of Amalgamation, Consolidation, Merger
                     or Sale of Assets.
                     --------------------------------------------------------

           (1)   Subject to  the provisions of  subsection 12.11(2), in  case of
     any  amalgamation or consolidation  of the  Company with, or  merger of the
     Company into,  any other  Person, any  merger  of another  Person into  the
     Company   (other   than  a   merger   which   does   not   result  in   any
     reclassification,  conversion,  exchange  or  cancellation  of  outstanding
     Common  Shares  of  the  Company)  or  any  sale  or  transfer  of  all  or
     substantially all of the  assets of the Company, the Person formed  by such
     consolidation or resulting  from such merger or which acquires such assets,
     as  the  case  may  be,  shall  execute  and  deliver  to  the  Trustee   a
     supplemental  indenture providing  that  the Holder  of each  Security then
     Outstanding  shall  have  the  right  thereafter,  during  the  period such
     Security shall  be convertible  as specified  in Section  12.1, to  convert
     such Security only into  the kind and amount of securities, cash  and other
     property receivable upon such amalgamation, consolidation,  merger, sale or
     transfer by  a holder of  the number of  Common Shares of  the Company into
     which such Security  might have been  converted immediately  prior to  such
     amalgamation, consolidation,  merger, sale or  transfer, and assuming  such
     holder of Common Shares  of the Company (i) is not  a Person with which the
     Company  consolidated or into which the Company merged or which merged into
     the Company or to which such  sale or transfer was made, as the case may be
     ("Constituent Person"),  or an Affiliate  of a Constituent  Person and (ii)
     failed  to exercise  his rights  of  election, if  any, as  to the  kind or
     amount  of  securities,  cash  and  other  property  receivable  upon  such
     consolidation,  merger, sale  or  transfer (provided  that  if the  kind or
     amount  of  securities,  cash  and  other  property  receivable  upon  such
     consolidation, merger,  sale or transfer  is not the  same for  each Common
     Share of the  Company held immediately prior to such consolidation, merger,
     sale  or  transfer by  others than  a  Constituent Person  or  an Affiliate
     thereof and in  respect of  which such rights  of election  shall not  have
     been  exercised ("Non-electing  Share"),  then  for  the  purpose  of  this
     Section 12.11  the kind and amount  of securities, cash  and other property
     receivable upon such amalgamation, consolidation, merger,  sale or transfer
     by the  holders of each Non-electing Share  shall be deemed to  be the kind
     and amount  so  receivable per  share by  a plurality  of the  Non-electing
     Shares),  and   further  assuming,  if  such  consolidation,  amalgamation,
     arrangement,  merger, conveyance,  transfer, sale or  lease occurs prior to
     the later of 60  days following the latest of (i) May  7, 1996 and (ii) the
     latest  date of  original issue  of  any Security,  that  the Security  was
     convertible at  the  time  of  such  occurrence  at  the  Conversion  Price
     specified in Section 12.1 as adjusted from the  issue date of such Security
     to  such  time  as   provided  in  this  Article  Twelve   subject  to  any
     requirements  necessary to  ensure  that the  Securities  will be  and will
     remain exempt from Canadian withholding tax  including, without limitation,
     the requirement in  effect on the date  hereof that a Holder  of Securities
     shall not  be entitled  to receive  shares, other  securities or  property,
     other than  securities  that  are  "prescribed securities"  as  defined  in
     Regulation 6208 to the Income Tax Act (Canada), in  the event that any such
     amalgamation, consolidation, merger  or transfer occurs in or prior to five

                                       - 102 -
<PAGE>






     years   after  the  date  of  original  issue  of  the  Securities.    Such
     supplemental  indenture shall  provide for  adjustments  which, for  events
     subsequent to the effective date  of such supplemental indenture,  shall be
     as nearly equivalent as may be practicable  to the adjustments provided for
     in  this  Article.    The above  provisions  of  this  Section 12.11  shall
     similarly apply to successive consolidations, mergers,  sales or transfers.
     Notice of the execution of such a supplemental indenture shall be given  by
     the Company  to the  Holder of  each Security  as provided  in Section  1.6
     promptly upon such execution.

           (2)   Notwithstanding any  provisions of  this Article  Twelve to the
     contrary,  if any  amalgamation, consolidation,  merger,  sale or  transfer
     should occur on or prior to  five years from the date of issue of  the last
     Security  to be  issued hereunder,  a holder  of  a Security  shall not  be
     entitled   in  any  circumstances  to   convert  such   Security  into  any
     securities, cash  or other property  (the "Substituted Properties")  unless
     such Substituted  Properties are  "prescribed securities"  with respect  to
     such Security  for purposes of  clause 212(1)(b)(vii)(E) of  the Income Tax
     Act (Canada).

           Neither the Trustee, any Paying Agent  nor any Conversion Agent shall
     be  under  any responsibility  to determine  correctness of  any provisions
     contained in  any such supplemental  indenture relating either  to the kind
     or  amount of  shares  of stock  or other  securities  or property  or cash
     receivable   by  Holders  of  Securities  upon   the  conversion  of  their
     Securities  after  any such  consolidation,  merger, conveyance,  transfer,
     sale or  lease or  to any  such adjustment,  but may  accept as  conclusive
     evidence of the correctness of any such provisions, and shall be  protected
     in  relying upon, an  Opinion of  Counsel with  respect thereto,  which the
     Company shall cause to be furnished to the Trustee upon request.

     SECTION 12.12  Responsibility of Trustee for Conversion Provisions
                    ---------------------------------------------------

           The Trustee,  subject  to the  provisions  of  Section 6.1,  and  any
     Conversion Agent shall not  at any time be under any duty or responsibility
     to any Holder of Securities to determine whether any facts exist which  may
     require any  adjustment of  the Conversion  Price, or  with respect to  the
     nature or extent  of any such adjustment when made,  or with respect to the
     method employed  herein or  in any  supplemental indenture  provided to  be
     employed,  in making the same, or whether  a supplemental indenture need be
     entered into.   Neither the Trustee,  subject to the provisions  of Section
     6.1,  nor any  Conversion Agent  shall be  accountable with respect  to the
     validity or value (or  the kind or amount) of  any Common Stock, or  of any
     other securities or  property or cash, which may  at any time be  issued or
     delivered upon the conversion of  any Security; and it or they do  not make
     any representation with respect thereto.   Neither the Trustee,  subject to
     the  provisions  of   Section  6.1,  and  any  Conversion  Agent  shall  be
     responsible for any  failure of the Company  to make or calculate  any cash
     payment or  to issue,  transfer or deliver  any shares  of Common Stock  or
     share  certificates  or other  securities  or  property  or  cash upon  the
     surrender  of any Security for the purpose  of conversion; and the Trustee,

                                       - 103 -
<PAGE>






     subject to the provisions  of Section 6.1,  and any Conversion Agent  shall
     not  be responsible for  any failure of the  Company to comply  with any of
     the covenants of the Company contained in this Article.


                                  ARTICLE THIRTEEN

                             SUBORDINATION OF SECURITIES

     SECTION 13.1.  Securities Subordinated to Senior Indebtedness.
                    ----------------------------------------------

           All  Securities issued  under this Indenture shall  be issued subject
     to the following provisions  and each Holder of  any Security whether  upon
     original issue  or upon transfer  or assignment thereof  accepts and agrees
     to be bound by such provisions.

           All  Securities issued  hereunder shall,  to  the  extent and  in the
     manner  hereinafter set  forth,  be subordinated  and  subject in  right of
     payment to the prior  payment in full of all Senior Indebtedness.   "Senior
     Indebtedness" means (i)  the principal, premium,  if any,  and interest  in
     respect  of (A)  indebtedness  of the  Company for  money borrowed  and (B)
     indebtedness evidenced  by securities, debentures,  bonds or other  similar
     instruments issued  by the Company,  (ii) all capital  lease obligations of
     the Company, (iii) all obligations of the Company issued or assumed as  the
     deferred purchase  price of property,  all conditional sale obligations  of
     the  Company and all  obligations of the Company  under any title retention
     agreement  (but excluding trade  accounts payable  arising in  the ordinary
     course  of  business),   (iv)  all  obligations  of  the  Company  for  the
     reimbursement  on  any  letter  of  credit,  bankers  acceptance,  security
     purchase  facility or  similar credit  transaction, (v)  all obligations of
     the type  referred to in  clauses (i) through  (iv) above of other  persons
     for the payment of which the Company  is responsible or liable as  obligor,
     guarantor or otherwise, and  (vi) all obligations  of the type referred  to
     in  clauses (i) through (v)  above of other persons secured  by any lien on
     any property or  assets of the Company  (whether or not such  obligation is
     assumed by  the  Company),  except  for  any  such  indebtedness  or  other
     obligation that  is by  its terms subordinated  to or  pari passu with  the
     Securities.

     SECTION 13.2.  No Payments in Certain Circumstances; Payment Over of
                    Proceeds Upon Dissolution, Etc.
                    -----------------------------------------------------

           No payment on account of  principal of, premium, if  any, or interest
     on, or redemption or  repurchase of,  the Securities shall  be made if,  at
     the time of such  payment or immediately after  giving effect thereto:  (i)
     there  shall exist a  default in the payment  of principal  of, premium, if
     any,  sinking funds or interest (including  a default under any purchase or
     redemption obligations) with  respect to  any Senior Indebtedness,  or (ii)
     there shall have occurred an event of default (other  than a default in the
     payment of  principal, premium,  if any,  sinking funds  or interest)  with

                                       - 104 -
<PAGE>






     respect  to  any   Senior  Indebtedness,  as  defined  therein  or  in  the
     instrument under  which the  same is  outstanding,  permitting the  holders
     thereof  to accelerate  the  maturity thereof  and  written notice  of such
     occurrence shall have  been given to the  Company and to the  Trustee under
     this Indenture  by the  holder or holders  of such Senior  Indebtedness and
     such  event of  default shall not  have been cured  or waived  or shall not
     have ceased to  exist after written notice  to the Company and  the Trustee
     by any holder of Senior  Indebtedness.  Notwithstanding the  foregoing, the
     Company may make, and  the Trustee may receive and shall apply, any payment
     in respect of the Securities ( for principal, premium, if any, or  interest
     or repurchase) if such payment was  made prior to the occurrence of  any of
     the contingencies specified in clauses (i) and (ii) above.

           Upon  (i)  any  acceleration  of  the  principal  amount  due  on the
     Securities or (ii) any  payment or distribution of assets of the Company of
     any kind  or  character,  whether  in  cash,  property  or  securities,  to
     creditors  upon  any   dissolution  or  winding  up  or  total  or  partial
     liquidation  or  reorganization  of  the  Company,   whether  voluntary  or
     involuntary   or   in  bankruptcy,   insolvency,   receivership  or   other
     proceedings, all principal of, premium,  if any, sinking fund  and interest
     due or to become due  upon all Senior Indebtedness  shall first be paid  in
     full,  or  payment  thereof  provided  for in  money  or  money's  worth in
     accordance with  its terms, before  any payment is  made on account of  the
     principal  of,  premium, if  any,  or interest  on,  or repurchase  of, the
     indebtedness evidenced by  the Securities, and upon any such dissolution or
     winding up or  liquidation or reorganization any payment or distribution of
     assets of the Company of any kind  or character, whether in cash,  property
     or securities, to which the Holders of the Securities or the Trustee  under
     this Indenture would be entitled,  except for the provisions  hereof, shall
     be  paid by  the  Company  or  by  any  receiver,  trustee  in  bankruptcy,
     liquidating  trustee,  agent  or  other  Person  making   such  payment  or
     distribution, or by the  Holders of the Securities or by the  Trustee under
     this Indenture if received by them  or it, as the case may  be, directly to
     the holders of Senior  Indebtedness (pro  rata to each  such holder on  the
     basis  of  the respective  amounts  of  Senior  Indebtedness  held by  such
     holder) or  their  representatives, to  the  extent  necessary to  pay  all
     Senior Indebtedness  in  full, in  money  or  money's worth,  after  giving
     effect to any concurrent  payment or distribution to or for the  holders of
     Senior Indebtedness,  before any  payment or  distribution is  made to  the
     Holders of the Securities or to the Trustee under this Indenture.

           In  the  event  that,  contrary  to  the  foregoing,  any  payment or
     distribution of assets of the Company of any kind or character, whether  in
     cash,  property or  securities,  shall be  received by  the Trustee  or the
     Holders of the Securities  before all Senior  Indebtedness is paid in  full
     or provision  made for such  payment, in  accordance with  its terms,  such
     payment or distribution shall be paid over or  delivered to, the holders of
     such Senior Indebtedness or their representative  or representatives, or to
     the  trustee  or  trustees  under  any  indenture  pursuant  to  which  any
     instruments evidencing any  of such  Senior Indebtedness have  been issued,
     as their  respective interests may  appear, for application  to the payment
     of all Senior Indebtedness  remaining unpaid to the extent necessary to pay

                                       - 105 -
<PAGE>






     all such Senior Indebtedness  in full in  accordance with its terms,  after
     giving  effect to  any concurrent  payment or  distribution  to or  for the
     holders of such Senior Indebtedness.

           Subject to  the  payment in  full  of  all Senior  Indebtedness,  the
     Holders  of  the  Securities  (together  with  the  holders  of  any  other
     indebtedness  of the Company which  is subordinated in  right of payment to
     the  payment in full of all Senior  Indebtedness, which is not subordinated
     in  right of payment to  the Securities and which by  its terms grants such
     right  of subrogation  to the holders  thereof) shall be  subrogated to the
     rights  of  the holders  of  Senior  Indebtedness  to  receive payments  or
     distributions of  assets of  the Company  made on  the Senior  Indebtedness
     until  the principal of,  premium, if any,  and interest  on, or repurchase
     of, the Securities  shall be paid  in full; and,  for the purposes  of such
     subrogation,  no  payments  or  distributions  to  the  holders  of  Senior
     Indebtedness  of any cash,  property or securities to  which the Holders of
     the Securities or  the Trustee would be entitled  except for the provisions
     of  this Article, and  no payment over pursuant  to the  provisions of this
     Article  to  the holders  of  Senior Indebtedness  by  the  Holders of  the
     Securities or the  Trustee, shall, as  between the  Company, its  creditors
     other  than  the  holders  of  Senior  Indebtedness,  and  the  Holders  of
     Securities, be deemed to  be a payment by the Company  to the holders of or
     on account of  Senior Indebtedness, it being understood that the provisions
     of  this Article are  and are intended solely  for the  purpose of defining
     the relative rights of the Holders of the Securities,  on the one hand, and
     the holders of Senior Indebtedness, on the other hand.

     SECTION 13.3.  Notice to Trustee of Specified Events; Reliance on
                    Certificate of Liquidating Agent.
                    --------------------------------------------------

           The  Company shall give  prompt written notice to  the Trustee of any
     insolvency  or bankruptcy  proceeding  in respect  of  the Company,  of any
     proceedings  for voluntary liquidation, dissolution or  other winding up of
     the Company (whether  or not involving  insolvency or  bankruptcy), of  the
     declaration  of  any Security  as  due  and  payable  before its  expressed
     maturity, and  of any event  which pursuant to  Section 13.2 would  prevent
     payment by  the Company on  account of the  principal, premium, if any,  or
     interest  on, or repurchase  of, the  Securities.  The  Trustee, subject to
     the provisions of Section  6.1, shall  be entitled to  assume that no  such
     event has occurred unless  the Company, or a holder of Senior Indebtedness,
     or any trustee therefor, has given such notice.

           Upon any distribution  of assets of the Company  or payment by or  on
     behalf of the  Company referred  to in this  Article, the  Trustee and  the
     Holders of  the Securities  shall be  entitled to  rely upon  any order  or
     decree of a  court of competent  jurisdiction in which  any proceedings  of
     the  nature referred  to in  Section  13.2 are  pending,  and the  Trustee,
     subject  to  the  provisions  of  Section  6.1,  and  the  Holders  of  the
     Securities shall be entitled to rely upon a certificate of the  liquidating
     trustee or agent or  other Person making any distribution to the Trustee or
     to the  Holders  of the  Securities  for the  purpose  of ascertaining  the

                                       - 106 -
<PAGE>






     Persons entitled  to participate in  such distribution, the  holders of the
     Senior  Indebtedness and  other  indebtedness of  the  Company, the  amount
     thereof  or payable  thereon,  the amount  or  amounts paid  or distributed
     thereon and all other  facts pertinent thereto or to this Article.   In the
     event that the Trustee determines, in good faith, that  further evidence is
     required  with respect  to the right  of any Person  as a  holder of Senior
     Indebtedness  to participate  in any  payment or  distribution  pursuant to
     this Article, the  Trustee may request such  Person to furnish  evidence to
     the  reasonable satisfaction  of the  Trustee as  to the  amount of  Senior
     Indebtedness held by such Person, as to the extent to which such  Person is
     entitled to  participate in such  payment or distribution, and  as to other
     facts  pertinent to the  rights of such Person  under this  Article, and if
     such evidence is  not furnished, the Trustee may  defer any payment to such
     Person pending judicial  determination as to  the right of  such Person  to
     receive such payment.

     SECTION 13.4. Trustee to Effectuate Subordination.
                   -----------------------------------

           The Holder of each Security by  his acceptance thereof authorizes and
     directs the Trustee on  his behalf to take such action  as may be necessary
     or appropriate to acknowledge  or effectuate the subordination as  provided
     in this Article and  appoints the Trustee  as attorney-in-fact for any  and
     all such purposes.

     SECTION 13.5. Trustee Not Charged with Knowledge of Prohibition.
                   -------------------------------------------------

           Notwithstanding  the  provisions   of  this  Article  or  any   other
     provision  of this Indenture, but subject to  the provisions of Section 6.1
     as between the Holders  of Securities and the Trustee, neither  the Trustee
     nor any  Paying Agent shall  be charged with  knowledge of any facts  which
     would prohibit the  making of any payment of moneys to or by the Trustee or
     any such Paying  Agent, unless and until  the Trustee or such  Paying Agent
     shall have  received written notice  thereof at its  Corporate Trust Office
     from  the Company or  any holder of Senior  Indebtedness or  the trustee or
     representative of any  holder of such  Senior Indebtedness  on his  behalf;
     and, prior to the  receipt of any such written notice, the  Trustee and any
     such  Paying Agent shall  be entitled to assume  that no  such facts exist.
     If  the Trustee  or  Paying Agent,  as  the case  may  be,  shall not  have
     received, at least three Business Days prior to the date upon  which by the
     terms  hereof  any  such  moneys   may  become  payable  for   any  purpose
     (including,  without limitation, the payment of  the principal of, premium,
     if any,  or the interest on any Security)  with respect to such moneys, the
     notice provided for  in this Section,  then, anything  herein contained  to
     the contrary notwithstanding,  the Trustee and  such Paying  Agent, as  the
     case may  be, shall have  full power and  authority to receive such  moneys
     and to  apply the  same to  the purpose for  which they  were received  and
     shall  not be affected by any notice  to the contrary which may be received
     by it within three Business Days prior to such date.



                                       - 107 -
<PAGE>






           Subject to  the  provisions of  Section  6.1,  the Trustee  shall  be
     entitled  to rely on  the delivery to  it of a  written notice  by a Person
     representing himself to be  a holder of Senior  Indebtedness (or a  trustee
     therefor) to  establish that  such notice  has been  given by  a holder  of
     Senior  Indebtedness  (or  a trustee  therefor).    In the  event  that the
     Trustee determines in  good faith that  further evidence  is required  with
     respect to the right  of any Person as  a holder of Senior Indebtedness  to
     participate in  any payment or  distribution pursuant to  this Article, the
     Trustee  may request  such  Person to  furnish  evidence to  the reasonable
     satisfaction of the  Trustee as to the  amount of Senior Indebtedness  held
     by such Person, the extent to which such  Person is entitled to participate
     in such  payment  or distribution  and  any other  facts pertinent  to  the
     rights of  such Person  under this  Article, and  if such  evidence is  not
     furnished,  the  Trustee may  defer  any  payment  to  such Person  pending
     judicial  determination as  to the  right of  such Person  to receive  such
     payment.

     SECTION 13.6. Reliance  on Judicial  Order  or  Certificate of  Liquidating
                   Agent.
                   --------------------------------------------------------

           Upon any  payment or distribution of  assets of  the Company referred
     to in this Article, the Trustee, subject to  the provisions of Section 6.1,
     and the Holders of  the Securities shall be entitled to rely upon any order
     or decree  entered by  any court of  competent jurisdiction  in which  such
     insolvency,   bankruptcy,   receivership,    liquidation,   reorganization,
     dissolution, winding  up or  similar case  or proceeding  is pending, or  a
     certificate of  the trustee in  bankruptcy, receiver, liquidating  trustee,
     custodian, assignee  for the benefit  of creditors, agent,  or other Person
     making such  payment or distribution,  delivered to the  Trustee or  to the
     Holders  of  Securities,  for  the  purpose  of  ascertaining  the  Persons
     entitled to participate  in such payment  or distribution,  the holders  of
     the Senior Indebtedness and other  indebtedness of the Company,  the amount
     thereof  or payable  thereon,  the amount  or  amounts paid  or distributed
     thereon and all other facts pertinent thereto or to this Article.

     SECTION 13.7. Trustee Not Fiduciary for Holders of Senior Indebtedness.
                   --------------------------------------------------------

           The Trustee  shall not  be deemed  to owe  any fiduciary duty  to the
     holders of Senior Indebtedness and shall not be  liable to any such holders
     if it shall in good  faith mistakenly pay over or distribute  to Holders of
     Securities or  to the  Company or  to any  other Person  cash, property  or
     securities to  which any holders  of Senior Indebtedness  shall be entitled
     by virtue of this Article or otherwise.

           With respect  to  the holders  of  Senior  Indebtedness, the  Trustee
     undertakes  to  perform  or  to observe  only  such  of  its  covenants  or
     obligations  as are specifically  set forth in this  Article and no implied
     covenants or obligations  with respect  to holders  of Senior  Indebtedness
     shall be read into this Indenture against the Trustee.


                                       - 108 -
<PAGE>






     SECTION 13.8.  Rights of Trustee as Holder of Senior Indebtedness;
                    Preservation Of Trustee's Rights.
                    --------------------------------------------------

           The Trustee  in its individual capacity  shall be entitled to all the
     rights set forth  in this Article  with respect to any  Senior Indebtedness
     which  may at  any time  be held  by it,  to the  same extent as  any other
     holder of Senior  Indebtedness, and nothing in this Indenture shall deprive
     the Trustee of any of its rights as such holder.

           Nothing in this  Article shall  apply to claims  of, or payments  to,
     the Trustee under or pursuant to Section 6.7.

     SECTION 13.9. Article Applicable to Paying Agents.
                   -----------------------------------

           In case  at any time any  Paying Agent other  than the Trustee  shall
     have been appointed by the Company and  be then acting hereunder, the  term
     "Trustee" as used  in this Article shall  in such case (unless  the context
     otherwise requires) be  construed as extending to and including such Paying
     Agent within its meaning  as fully for all intents and  purposes as if such
     Paying Agent were named  in this Article in addition to  or in place of the
     Trustee; provided,  however, that  Section 13.5,  13.6 and  13.7 shall  not
     apply  to  the Company  or  any Affiliate  of  the  Company if  it  or such
     Affiliate acts as Paying Agent.

     SECTION 13.10.  Certain Conversions Deemed Payment.
                     ----------------------------------

           For the purposes of this Article only, (1)  the issuance and delivery
     of  junior  securities upon  conversion  of Securities  in  accordance with
     Article Twelve  or upon  the repurchase  of Securities  in accordance  with
     Article  Fourteen  shall  not  be   deemed  to  constitute  a   payment  or
     distribution  on account  of the  principal  of or  premium or  interest on
     Securities  or  on   account  of  the  purchase  or  other  acquisition  of
     Securities, and (2) the payment,  issuance or delivery of cash, property or
     securities  (other than junior  securities) upon  conversion of  a Security
     shall be deemed to  constitute payment on account of the principal  of such
     Security.  For  the purposes of this Section,  the term "junior securities"
     means  Common Stock and any  other cash, property  or securities into which
     the  Securities  are  convertible  pursuant  to  Article Twelve.    Nothing
     contained  in  this Article  or  elsewhere  in  this Indenture  or  in  the
     Securities  is  intended to  or shall  impair,  as among  the  Company, its
     creditors other than holders of Senior Indebtedness and the Holders  of the
     Securities, the right, which is  absolute and unconditional, of  the Holder
     of any Security  to convert such Security in accordance with Article Twelve
     or to exchange such  Security for Common Stock  in accordance with  Article
     Fourteen if the  Company elects to  satisfy the  obligations under  Article
     Fourteen by delivery of Common Stock.




                                       - 109 -
<PAGE>






                                  ARTICLE FOURTEEN

                    REPURCHASE OF SECURITIES AT THE OPTION OF THE
                           HOLDER UPON A CHANGE IN CONTROL

     SECTION 14.1.  Right to Require Repurchase.
                    ---------------------------

           In the event that a Change in Control (as hereinafter defined)  shall
     occur, then each  Holder shall have the  right, at the Holder's  option, to
     require the Company to repurchase, and upon the  exercise of such right the
     Company shall repurchase, all of  such Holder's Securities, or  any portion
     of  the  principal  amount thereof  that  is  equal  to  U.S.$1,000 or  any
     integral multiple of  U.S.$1,000 in excess thereof (provided that no single
     Security may  be repurchased in  part unless the  portion of the  principal
     amount  of such Security  to be Outstanding after  such repurchase is equal
     to U.S.$1,000  or integral multiples  of U.S.$1,000 in  excess thereof), on
     the  date (the "Repurchase  Date") that  is 45 days  after the  date of the
     Company Notice (as  defined in Section 14.2)  at a purchase price  equal to
     100%  of the  principal amount  of the  Securities to  be repurchased  (the
     "Repurchase  Price")  plus   interest  accrued  to  the   Repurchase  Date;
     provided,  however,  that  installments of  interest  on  Securities  whose
     Stated  Maturity is on or prior to  the Repurchase Date shall be payable to
     the Holders  of such  Securities, or  one or  more Predecessor  Securities,
     registered as such  on the relevant  Record Date according  to their  terms
     and the provisions  of Section 3.7.   Such right to require  the repurchase
     of the Securities shall  not continue after a discharge of the Company from
     its obligations with respect to  the Securities in accordance  with Article
     Four,  unless  a Change  in  Control  shall  have  occurred prior  to  such
     discharge.  At the option of the Company, the  Repurchase Price may be paid
     in cash  or, except as otherwise  provided in Section 14.2(j),  by delivery
     of  shares of  Common  Shares  having a  fair  market  value equal  to  the
     Repurchase Price;  provided that payment  may not be made  in Common Shares
     unless  at  the  time  of  payment  such  stock  is listed  on  a  national
     securities  exchange or quoted  on Nasdaq.   For purposes  of this Section,
     the fair market value of Common Shares  shall be determined by the  Company
     and shall be equal  to 95% of the average  of the Closing Prices  Per Share
     for the  five consecutive  Trading Days ending  on and including  the third
     Trading Day  immediately preceding the  Repurchase Date.   Whenever in this
     Indenture (including  Sections  2.2,  3.1,  5.1(2)  and  5.8)  there  is  a
     reference, in  any context,  to the  principal of  any Security  as of  any
     time,  such  reference   shall  be  deemed  to  include  reference  to  the
     Repurchase  Price payable  in respect of  such Security to  the extent that
     such  Repurchase Price is,  was or  would be so  payable at  such time, and
     express  mention of the Repurchase Price in any provision of this Indenture
     shall  not  be  construed  as  excluding  the  Repurchase  Price  in  those
     provisions of this Indenture when such express mention is not made.






                                       - 110 -
<PAGE>






     SECTION 14.2.  Notices; Method of Exercising Repurchase Right, Etc.
                    ----------------------------------------------------

           (a)  Unless the Company shall  have theretofore called for redemption
     all of  the Outstanding  Securities, on or  before the  30th day after  the
     occurrence of  a Change  in Control,  the Company  or, at  the request  and
     expense  of  the  Company,  the  Trustee,  shall  give  to  all  Holders of
     Securities, in the  manner provided in  Section 1.6,  notice (the  "Company
     Notice") of the occurrence of the Change  in Control and of the  repurchase
     right set forth herein arising as a result thereof. The Company shall  also
     deliver a copy of such notice of a repurchase right to the Trustee.

                  Each notice of a repurchase right shall state:

                  (1) the Repurchase Date,

                  (2) the date by which the repurchase right must be exercised,

                  (3) the Repurchase Price,

                  (4)  a description of the procedure which a Holder must follow
           to exercise a  repurchase right, and  the place or places  where such
           Securities, are  to  be  surrendered for  payment of  the  Repurchase
           Price and accrued interest, if any,

                  (5)  that on  the Repurchase  Date the  Repurchase  Price, and
           accrued interest,  if any, will become due and payable upon each such
           Security  designated  by  the  Holder  to  be  repurchased, and  that
           interest thereon shall cease to accrue on and after said date,

                  (6) the  Conversion Price then  in effect, the  date on  which
           the  right to  convert the principal  amount of the  Securities to be
           repurchased  will  terminate  and  the  place  or  places  where such
           Securities, may be surrendered for conversion, and

                  (7)  the place  or places  that  the certificate  required  by
           Section 2.2 shall be delivered, and the form of such certificate

           In  addition, at  least two  Business Days  preceding the  Repurchase
     Date, the  Company shall  give to  all Holders  of the  Securities, in  the
     manner provided in  Section 1.6,  notice specifying whether  the Repurchase
     Price will be payable in cash or Common Shares and shall  deliver a copy of
     such notice to the Trustee.

           No failure  of the Company  to give  the foregoing notices  or defect
     therein shall  limit any Holder's right  to exercise a  repurchase right or
     affect the validity of the proceedings for the repurchase of Securities.

           If any  of  the foregoing  provisions  or  other provisions  of  this
     Article are inconsistent with applicable law, such law shall govern.



                                       - 111 -
<PAGE>






           (b)  To exercise  a repurchase right,  a Holder shall deliver to  the
     Trustee or  any Paying Agent on  or before the  30th day after  the date of
     the Company  Notice (i)  written notice of  the Holder's  exercise of  such
     right, which notice  shall set forth the name  of the Holder, the principal
     amount of  the Securities  to be repurchased  (and, if  any Security is  to
     repurchased in  part,  the  serial  number  thereof,  the  portion  of  the
     principal amount thereof  to be repurchased and  the name of the  Person in
     which the  portion thereof to  remain Outstanding after  such repurchase is
     to  be  registered) and  a  statement  that  an election  to  exercise  the
     repurchase  right  is  being made  thereby,  and,  in  the event  that  the
     Repurchase Price shall  be paid in Common  Shares, the name or  names (with
     addresses) in  which the certificate  or certificates for  shares of Common
     Shares shall be  issued, and (ii) the Securities  with respect to which the
     repurchase right is being exercised, if any, appertaining thereto  maturing
     after  the Repurchase  Date.   Such  written  notice shall  be irrevocable,
     except that the right of the Holder to convert the Securities with  respect
     to which the  repurchase right is being exercised  shall continue until the
     close of business on the second Trading Day preceding the Repurchase Date.

           (c)    In  the  event  a  repurchase  right  shall  be  exercised  in
     accordance with the  terms hereof,  the Company shall  pay or  cause to  be
     paid to  the Trustee or the Paying Agent in  London the Repurchase Price in
     cash or Common Shares, as provided above, for payment to the Holder  on the
     Repurchase Date or, if  Common Shares are to be paid, as promptly after the
     Repurchase  Date as practicable, together with  accrued and unpaid interest
     to the Repurchase Date  payable with respect to the Securities as  to which
     the   purchase  right   has  been   exercised;   provided,  however,   that
     installments  of interest that  mature on  or prior to  the Repurchase Date
     shall  be payable in cash to the Holders of such Securities, or one or more
     Predecessor Securities, registered as  such at the close of business on the
     relevant Regular Record Date.

           (d)  If any Security (or  portion thereof) surrendered for repurchase
     shall not be so  paid on the Repurchase Date, the  principal amount of such
     Security (or portion thereof,  as the case may be) shall, until  paid, bear
     interest to  the extent  permitted by  applicable law  from the  Repurchase
     Date  at  the rate  of  6.50% per  annum,  and each  Security  shall remain
     convertible into Common  Shares until the  principal of  such Security  (or
     portion  thereof, as the case may be) shall have been paid or duly provided
     for.

           (e)   Any Security which is to  be repurchased only  in part shall be
     surrendered  to  the  Trustee (with,  if  the  Company  or the  Trustee  so
     requires, due  endorsement by, or a written  instrument of transfer in form
     satisfactory to the Company  and the Trustee  duly executed by, the  Holder
     thereof or his  attorney duly authorized in writing), and the Company shall
     execute,  and  the  Trustee  shall  authenticate  and  make  available  for
     delivery  to the  Holder of  such Security  without service  charge, a  new
     Security or Securities, containing identical terms and  conditions, each in
     an authorized  denomination in aggregate  principal amount equal  to and in
     exchange for  the unrepurchased portion of the principal of the Security so
     surrendered.

                                       - 112 -
<PAGE>






           (f)   Any  issuance of  Common  Shares in  respect of  the Repurchase
     Price shall be deemed to have been effected  immediately prior to the close
     of business on  the Repurchase Date and the Person or Persons in whose name
     or  names  any certificate  or  certificates  for  Common  Shares shall  be
     issuable  upon  such  repurchase shall  be  deemed  to have  become  on the
     Repurchase Date the  holder or holders of record  of the shares represented
     thereby; provided, however,  that any surrender  for repurchase  on a  date
     when  the  stock  transfer  books of  the  Company  shall  be  closed shall
     constitute the Person or  Persons in whose name or names the certificate or
     certificates  for  such shares  are to  be  issued as  the  recordholder or
     holders thereof  for all purposes  at the opening  of business on the  next
     succeeding day on which such stock transfer books are  open.  No payment or
     adjustment  shall be  made  for dividends  or  distributions on  any Common
     Shares  issued  upon repurchase  of  any  Security  declared  prior to  the
     Repurchase Date.

           (g)   No  fractions  of  shares shall  be issued  upon  repurchase of
     Securities.  If more than one Security  shall be repurchased from the  same
     Holder  and the  Repurchase Price shall  be payable  in Common  Shares, the
     number of  full shares which shall  be issuable upon such  repurchase shall
     be  computed  on  the  basis  of the  aggregate  principal  amount  of  the
     Securities  so repurchased.    Instead of  any  fractional share  of Common
     Shares  which would otherwise be issuable on the repurchase of any Security
     or Securities, the  Company will deliver to the applicable Holder its check
     for the current market value of such fractional share.  The current  market
     value of  a fraction of  a share is  determined by multiplying the  current
     market price of a  full share by the fraction,  and rounding the result  to
     the nearest cent.   For purposes of this  Section, the current market price
     of a  Common Share is  the Closing Price  Per Share of the  Common Share on
     the last Trading Day prior to the Repurchase Date.

           (h)   Any issuance  and delivery of certificates  for Common Share on
     repurchase  of Securities  shall be  made without  charge to  the Holder of
     Securities being repurchased  for such certificates or for any transfer tax
     or duty in respect of the issuance  or delivery of such certificates or the
     securities represented thereby;  provided, however, that the  Company shall
     not be  required to pay any  transfer tax or  duty which may  be payable in
     respect of (i)  income of the Holder  or (ii) any transfer involved  in the
     issuance or delivery of  certificates for shares of Common Shares in a name
     other than that  of the Holder of the  Securities being repurchased, and no
     such  issuance  or delivery  shall  be made  unless  and  until the  Person
     requesting such issuance or  delivery has paid to the Company the amount of
     any  such  tax or  duty  or has  established,  to the  satisfaction  of the
     Company, that such tax or duty has been paid.

           (i)  If any  Common Shares to be issued upon repurchase of Securities
     hereunder  require  registration  with  or  approval  of  any  governmental
     authority under any federal  or state law before such shares may be validly
     issued or delivered upon repurchase, the Company covenants that  it will in
     good  faith  and as  expeditiously  as  possible  endeavor  to secure  such
     registration  or approval,  as  the case  may  be; provided,  however, that
     nothing  in  this  Section  shall  be  deemed  to  affect in  any  way  the

                                       - 113 -
<PAGE>






     obligations of the  Company to repurchase  Securities as  provided in  this
     Article  and  if such  registration  is not  completed  or does  not become
     effective or such approval  is not obtained prior  to the Repurchase  Date,
     the Repurchase Price shall be paid in cash.

           (j)   The  Company  covenants  that all  Common Shares  which  may be
     issued  upon repurchase of Securities  will upon issue  be duly and validly
     issued and fully paid and non-assessable.


     SECTION 14.3.  Certain Definitions.
                    -------------------

           For purposes of this Article Fourteen,

                  (a)  the  term  "beneficial  owner"  shall  be  determined  in
           accordance with Rule 13d-3, as in effect on the date of the  original
           execution of this  Indenture, promulgated by the Commission  pursuant
           to the Exchange Act;

                  (b) a "Change in Control" shall  be deemed to have occurred at
           the  time, after  the original  issuance  of  the Securities,  of: an
           event or  series of  events by which  any Person or  other entity  or
           Group of Persons shall,  as a result of  a tender or  exchange offer,
           open  market  purchases,  privately   negotiated  purchases,  merger,
           consolidation  or  otherwise (collectively,  "Control  Acquisitions")
           have become  the beneficial owner (within  the meaning  of Rule 13d-3
           under the  Exchange Act) of 50% or  more of the total voting power of
           all shares  of capital stock the  Company entitled  to vote generally
           in the election of directors; (ii)  any consolidation or otherwise of
           the Company with,  or merger of the  Company into, any other  Person,
           any  merger  of another  Person into  the  Company, or  any sales  or
           transfer of all or substantially all of the  assets of the Company to
           another  Person; or  (iii)  the  direct  or  indirect,  sale,  lease,
           exchange or other transfer of all or  substantially all of the assets
           of the Company to any Person or Group of Persons;

     provided, however,  that a Change  in Control shall  not be deemed to  have
     occurred if either  (x) the  Closing Price Per  Share on  any five  Trading
     Days within  the period of  10 consecutive Trading  Days ending immediately
     after  the later of the  date of the  Change in Control or  the date of the
     public  announcement of the Change in  Control (in the case  of a Change in
     Control  under Clause  (i) above) or  the period of  10 consecutive Trading
     Days ending immediately prior to the date of the Change in Control (in  the
     case of a Change in  Control under Clause (ii) and (iii) above) shall equal
     or exceed 105%  of the Conversion Price  in effect on  such trading day  or
     (y) all the consideration (excluding  cash payments for fractional  shares)
     to  be  paid  for  the Common  Shares  in  a  transaction  or  transactions
     constituting the  Change  in Control  as  described  in Clause  (ii)  above
     consists of  shares of  common  stock traded  on a  United States  national
     securities exchange or  quoted on Nasdaq  National Market  System and as  a
     result  of   such  transaction  or   transactions  the  Securities   become

                                       - 114 -
<PAGE>






     convertible  solely into  such common  stock,  and such  common stock  is a
     "prescribed  security"  with  respect to  the  Securities  for  purposes of
     clause 212(1)(b)(vii)(E) of the Income Tax Act (Canada);

           (c)  In  this  Article  Fourteen,  the  term  "Person"  or  "Group of
     Persons" shall include any syndicate or group  which would be deemed to  be
     a "person" under Section 13(d)(3) of the Exchange Act, as  in effect on the
     date of the original execution of this Indenture.


                                   ARTICLE FIFTEEN

                   HOLDERS LISTS AND REPORTS BY TRUSTEE AND COMPANY

     SECTION 15.1.  Company to Furnish Trustee Names and Addresses of Holders.
                    ---------------------------------------------------------

           The Company will furnish or cause to be furnished to the Trustee:

                  (a)  semi-annually, not  more than  15 days after  the Regular
           Record  Date,  a list,  in such  form as  the Trustee  may reasonably
           require, of the  names and addresses of  the Holders of Securities as
           of such Regular Record Date, and

                  (b)  at such other times as the Trustee may reasonably request
           in writing, within  30 days after the receipt  by the Company of  any
           such request, a  list of similar form  and content as  of a  date not
           more than 15 days prior to the time such list is furnished;

     excluding from any  such list names and  addresses received by  the Trustee
     in its capacity as Security Registrar.

     SECTION 15.2.  Preservation of Information.
                    ---------------------------

           The Trustee shall  preserve, in as  current a form  as is  reasonably
     practicable,  the names  and  addresses of  Holders  contained in  the most
     recent list furnished  to the Trustee as  provided in Section 15.1  and the
     names and addresses of Holders received by  the Trustee in its capacity  as
     Security Registrar.   The  Trustee may  destroy  any list  furnished to  it
     pursuant to Section 15.1 upon receipt of a new list so furnished.

     ______________________________


           This instrument may be executed in  any number of counterparts,  each
     of which  so executed  shall be  deemed  to be  an original,  but all  such
     counterparts shall together constitute but one and the same instrument.





                                       - 115 -
<PAGE>






           IN WITNESS WHEREOF, the parties hereto  have caused this Indenture to
     be  duly executed,  and  their respective  corporate  seals to  be hereunto
     affixed and attested, all as of the day and year first above written.

                                           NORTH AMERICAN VACCINE, INC.



     (Seal)                                By /s/ Sharon Mates
                                              --------------------------
                                              Name:  Sharon Mates, Ph.D.
                                              Title: President

     Attest:


     /s/ Daniel J. Abdun-Nabi
     ---------------------------
     Name:  Daniel J. Abdun-Nabi
     Title: Secretary

                                           MARINE MIDLAND BANK,
                                           AS TRUSTEE



     (Seal)                                By /s/ Richard G. Pittius
                                              --------------------------
                                              Name:  Richard Pittius
                                              Title: Vice President

     Attest:


     /s/ Frank J. Godino
     --------------------------
     Name:   Frank J. Godino
     Title:  Corporate Trust Officer 















                                       - 116 -
<PAGE>






     WASHINGTON,              )
     DISTRICT OF              ): SS.:
     COLUMBIA                 )

           On the 7th day of May, 1996, before me personally came Sharon  Mates,
     to me known, who, being  by me duly sworn, did  depose and say that  she is
     Sharon  Mates of NORTH AMERICAN  VACCINE,  INC.,  one  of  the corporations
     described in  and which executed  the foregoing instrument;  that she knows
     the seal of said corporation; that the  seal affixed to said instrument  is
     such corporate  seal; that it was  so affixed by authority  of the Board of
     Directors  of said  corporation; and  that she  signed her  name thereto by
     like authority.


                                           /s/ Judith E. Snyder
                                           _____________________
                                               Notary Public




































                                       - 117 -
<PAGE>







     STATE OF NEW YORK
                     
     COUNTY OF NEW YORK     

           On the  7th day of  May, 1996, before  me personally  came Richard G.
     Pittius, to me known, who, being by me duly sworn, did  depose and say that
     he is Richard  G. Pittius of Marine  Midland Bank, one of  the corporations
     described in and  which executed the  foregoing instrument;  that he  knows
     the seal of  said corporation; that the seal  affixed to said instrument is
     such corporate seal; that  it was so affixed pursuant to the bylaws of said
     corporation; and that he signed his name thereto by like authority.


                                           /s/ Marcia A. Markowski
                                           ------------------------
                                               Notary Public




































                                       - 118 -
<PAGE>






                                      ANNEX A-1

     FORM OF CONVERSION NOTICE - - UNRESTRICTED SECURITIES



     ________________________
     as Conversion Agent
     [Address]

           Re:    North American Vaccine, Inc.
                  6.50% Convertible Subordinated Notes
                  Due May 1, 2003 (the "Securities")

           Reference is hereby made  to the Indenture, dated  as of May  7, 1996
     (the "Indenture"),  between North American  Vaccine, Inc. (the  "Company"),
     as  Issuer, and Marine  Midland Bank,  as Trustee.   Capitalized terms used
     but not  defined  herein shall  have  the meanings  given  to them  in  the
     Indenture.

           This letter relates  to the Unrestricted Securities specified  below,
     which are registered  in the name of  the undersigned (the "Holder").   The
     Holder hereby  irrevocably exercises its right  to convert such Securities,
     or the  portion thereof, if any,  specified below, into  Common Shares and,
     as specified below, directs  that such Shares, together  with any check  in
     payment  for  a   fractional  share  and  any  Security   representing  any
     unconverted principal amount, be issued  and delivered in book-  entry form
     through the facilities  of the Depositary, for credit  to the account(s) of
     the Person(s)] [in  certificated form to the Registered owner(s)] indicated
     below.

           The Holder  acknowledges and  agrees that  no Common  Shares will  be
     delivered  upon   conversion  of  the   specified  Securities  during   the
     Restricted Period unless the  beneficial owner(s) is not a  U.S. Person (as
     defined in Regulation S).  In addition, no  Common Shares will be delivered
     on conversion  until  any  amount  payable by  the  Holder  on  account  of
     interest  is paid,  any certificates  evidencing  specified Securities  not
     held in book-entry form are duly endorsed or assigned  to the Company or in
     blank and surrendered and any taxes or other charges or documents  required
     in connection  with a transfer on conversion, and any other required items,
     are delivered to the Conversion Agent.

           The  Holder  acknowledges  and  agrees  that,  notwithstanding   this
     request for  conversion, the Company  and the Trustee may  require that the
     Common  Shares  delivered  on  conversion of  the  specified  Securities be
     delivered in certificated form subject to a restrictive legend.

           Conversion   of  the   specified  Securities   is  subject   to   the
     requirements established by  the Company and  the Trustee  pursuant to  the
     Indenture,  as  well  as  to  the  procedures  of  the Depositary  if  such
     Securities are  held or to  be held  in book-entry form,  all as in  effect
     from time to time.   The specified Securities  will be deemed to  have been

                                       A-1-119
<PAGE>






     converted  immediately prior  to  the  close  of  business on  the  day  of
     surrender  of the  specified  Securities for  conversion  and on  which all
     other  required  items have  been  delivered  to  the  Conversion Agent  as
     provided above  and, upon such  conversion, shall cease  to accrue interest
     or be  outstanding.   Prior to  such conversion,  the Holder  will have  no
     rights in the Conversion Securities.

           Please provide the information requested below, as applicable.

     1.    PLEASE SPECIFY  THE SECURITIES  HELD AND  THE PORTION  THEREOF TO  BE
           CONVERTED ;

           Principal amount held:  U.S. $_____________
           CUSIP number(s):  __________________
           Depositary (DTC) account where held:  ______________
           Principal    amount   being    converted   (if    less   than   all):
           U.S. $_____________

     All Securities  to be converted  will be converted  into Common  Shares and
     (together with any  unconverted Securities) will be delivered in book-entry
     form to the DTC account specified in Item 2 below.

     2.    Please  specify  the  type,  number  and  form  of  securities  to be
     delivered  on  conversion and  the  name(s)  of  the  account holder(s)  or
     registered owner(s), by  checking the appropriate boxes  and providing  the
     information requested:

           n      Book Entry
                  Number of Common Shares:  __________________
                  Depositary Account:           __________________

           n      Certificates
                  Number of Common Shares:  __________________
                  Registered Owner:             __________________

           n      Unconverted Book-Entry
                  Principal Amount:       U.S. $ __________________  *
                  Depositary Account:                __________________ 

           n      Unconverted Securities 
                  (Only in Instances
                  Defined by the Indenture)
                  Principal Amount:        U.S. $ __________________ *
                  Registered Owner:                    __________________

     ___________________

     *     Aggregate  principal  amount of  each  certificate  must  equal  U.S.
     $1,000 or any integral multiple thereof.




                                       A-1-120
<PAGE>







              Please sign and date this notice in the space provided below.

     DATE:                             ____________________
                                                 Name of Holder


                                       ______________________
                                       Signature(s) of Holder Title(s):

                                       (If   the   Holder   is  a   corporation,
                                       partnership  or  fiduciary, the  title of
                                       the  Person  signing  on  behalf  of  the
                                       Holder must be stated.)

     Signature(s) must be guaranteed by a commercial bank or trust company or  a
     member firm  of a  U.S. national  securities exchange  or a  member of  the
     National  Association  of  Securities  Dealers, Inc.  if  Common  Shares or
     unconverted Securities are  to be delivered other  than to and in  the name
     of the registered owner.



     _____________________
                                 Signature Guarantee




























                                       A-1-121
<PAGE>






                                      ANNEX A-2

                 FORM OF CONVERSION NOTICE -- RESTRICTED SECURITIES




     ________________________
     as Conversion Agent
     [Address]

              Re:     North American Vaccine, Inc.
                      6.50% Convertible Subordinated Notes
                      Due May 1, 2003 (the "Securities")

              Reference  is hereby made  to the  Indenture, dated  as of  May 7,
     1996  (the  "Indenture"),   between  North  American  Vaccine,   Inc.  (the
     "Company"), as  Issuer, and Marine  Midland Bank, as  Trustee.  Capitalized
     terms used but not defined  herein shall have the meanings given to them in
     the Indenture.

              This letter relates to  the Restricted Securities specified below,
     which are registered  in the name of  the undersigned (the "Holder").   The
     Holder hereby irrevocably exercises  its right to convert  such Securities,
     or the portion thereof,  if any, specified below,  into Common Shares  and,
     except to  the extent  specified or  required as  described below,  directs
     that Restricted  Common Shares,  together with any  check in payment  for a
     fractional share  and any Security  representing any unconverted  principal
     amount, be issued  and delivered [in book-entry form through the facilities
     of the Depositary,  to the account(s) of  the Person(s)] [  in certificated
     form to the Registered Owner (s)] indicated below.

              No  Common Shares  will  be delivered  upon conversion  until  any
     amount  payable  by  the  Holder  on  account  of  interest  is  paid,  any
     certificates evidencing  specified Securities not  held in book-entry  form
     are duly endorsed  or assigned to the  Company or in blank  and surrendered
     and any taxes  or other charges or documents  required in connection with a
     transfer on conversion, and any other required items, are  delivered to the
     Conversion Agent.

              The Holder  acknowledges  and  agrees that,  notwithstanding  this
     request for  conversion, the  Company may  require that  the Common  Shares
     delivered  on conversion  of  the  specified  Securities  be  delivered  in
     certificated  form subject  to  a restrictive  legend,  or that  additional
     certificates be delivered on behalf of the relevant beneficial owner(s).

              Any Holder  requesting Common Shares or  unconverted Securities in
     book-entry form  acknowledges and warrants  for the benefit  of the Company
     that  such  Holder and  any  beneficial  owner(s)  of  such Securities  are
     Qualified Institutional Buyers (as defined in Rule 144A).



                                       A-2-122
<PAGE>






              Conversion  of   the  specified  Securities  is   subject  to  the
     requirements established by  the Company pursuant to the Indenture, as well
     as  to the procedures of the  Depositary if such Securities  are held or to
     be held  in book-entry  form, all  as in  effect from  time to  time.   The
     specified  Securities will  be  deemed to  have been  converted immediately
     prior to  the close of  business on the  day of surrender  of the specified
     securities for conversion and on  which all other required items  have been
     delivered to  the  Conversion  Agent  as  provided  above  and,  upon  such
     conversion, shall  cease to accrue  interest or be  outstanding.  Prior  to
     such  conversion,  the  Holder  will  have  no  rights  in  the  Conversion
     Securities.

              Please provide the information required below, as applicable:

     1.       PLEASE SPECIFY THE  SECURITIES HELD AND THE PORTION THEREOF  TO BE
              CONVERTED;

              Principal amount held:  U.S.  $__________________________________ 
                                                         
              CUSIP  number(s):________________________________________________ 
                                                                  
              Depositary (DTC) account where held:____________________________
              Principal amount  being  converted  (if  less  than  all):    U.S.
              $_______________________                                        

     2.       Please specify  the type,  number  and form  of securities  to  be
              delivered on     conversion  and  the  name(s)   of  the   account
              holder(s)  or registered  owner(s),  by checking  the  appropriate
              boxes and providing the information requested:

                      n        Book Entry *
                               Number of Common Shares:_______________________
                               Depositary Account: ___________________________  
                                           


                      n        Unconverted Book Entry*
                               Principal Amount:  U.S.$_______________________
                               Depositary Account:____________________________




     ______________

     *  Only  Qualified  Institutional  Buyers  may  receive  Common  Shares  in
     book-entry form.  Others  must receive certificates, each  in an amount  of
     at least U.S. $1,000.
                      n        Unconverted Certificates
                               Principal Amount:  U.S.$________________________
                               Registered Owner:_______________________________


                                       A-2-123
<PAGE>






                      n        Certificates
                               Number of Common Shares: _______________________
                               Registered Owner:_______________________________

     3.  Please specify whether the beneficial owner (s) are:

                      n        A  Qualified Institutional  Buyer, as  defined in
                               Rule 144A.

                      n        An  institution that is an "accredited investor,"
                               as  defined in  Rule 501(a)(1),  (2), (3)  or (7)
                               under the Securities Act, that is not a Qualified
                               Institutional Buyer.

                               Not a  "U. S. person" (as  defined in Regulations
                               S).


     DATE:                                      ____________________
                                                 Name of Holder


                                                _____________________
                                                Signature(s) of Holder

                                                (If the Holder is a corporation,
                                                partnership  or  fiduciary,  the
                                                title of the  Person signing  on
                                                behalf  of  the  Holder  must be
                                                stated.)

     Signature(s) must be guaranteed by a commercial bank  or trust company or a
     member firm  of a  U.S. national  securities exchange  or a  member of  the
     National Association  of Securities Dealers,  Inc. if Common  Shares are to
     be  delivered, or unconverted  Securities are to  be issued,  other than to
     and in the name of the registered owner.




     __________________
     Signature Guarantee
                                (End of Certificate)










                                       A-2-124
<PAGE>






                                      ANNEX B-1

                           FORM OF TRANSFER CERTIFICATE --
                            RESTRICTED GLOBAL SECURITY TO
                             REGULATION S GLOBAL SECURITY

     Marine Midland Bank
     140 Broadway, 12th Floor
     New York, NY 10005-1180
     Attention:  Corporate Trust Department


              Re:     North American Vaccine, Inc.
                      6.50% Convertible Subordinated Notes
                      Due May 1, 2003

              Reference  is hereby  made to the  Indenture, dated  as of  May 7,
     1996 (the  "Indenture"), between  North American Vaccine,  Inc., as Issuer,
     and Marine  Midland  Bank, as  Trustee.   Capitalized  terms  used but  not
     defined herein shall have the meanings given to them in the Indenture.

              This  letter relates  to U.S.  $_____________  aggregate principal
     amount of Securities  which are evidenced by the Restricted Global Security
     (CUSIP No. 657201AA7) and held with the  Depositary in the name of  [insert
     name of transferor]  (the "Transferor").   The Transferor  has requested  a
     transfer of  such beneficial  interest in  the Securities to  a Person  who
     will take  delivery thereof  in the  form of  an equal aggregate  principal
     amount of Securities evidenced by  the Regulation S Global  Security (CUSIP
     No. U65777AA9), which  amount, immediately after  such transfer,  is to  be
     held with the Depositary through Euroclear or CEDEL or both.

              In   connection  with  such  request   and  in  respect   of  such
     Securities, the Transferor  does hereby certify that such transfer has been
     effected  pursuant to  and in  accordance  with Rule  904 under  the United
     States  Securities Act  of  1933, as  amended  (the "Securities  Act"), and
     accordingly the Transferor does hereby further certify that:

              (1) the  offer of the Securities  was not made to  a person in the
     United States;

              (2) either:

                      (A)  at  the  time  the  buy  order  was  originated,  the
     transferee was  outside the United States or  the Transferor and any person
     acting on  its behalf reasonably  believed that the  transferee was outside
     the United States, or

                      (B)  the transaction was  executed in, on, or  through the
     facilities  of  a designated  offshore  securities market  and  neither the
     Transferor nor any  person acting on its behalf  knows that the transaction
     was pre-arranged with a buyer in the United States;


                                       B-1-125
<PAGE>






              (3) no  directed selling efforts have  been made in  contravention
     of the requirements of 904(b) of Regulation S, as applicable;

              (4)  the transaction is not part of a plan  or scheme to evade the
     registration requirements of the Securities Act; and

              (5)  upon completion  of the transaction, the beneficial  interest
     being transferred as described above  was held with the  Depositary through
     Euroclear or CEDEL or both.


              This certificate and the  statements contained herein are made for
     the  benefit of the Company and the Initial Purchasers.  Terms used in this
     certificate and  not otherwise defined  in the Indenture  have the meanings
     set forth in Regulation S under the Securities Act.

     Dated:                                     [Insert Name of Transferor]


                                                By:     _______________________
                                                         Name:
                                                         Title:

       (If the registered owner is a corporation, partnership or fiduciary, the
     title of the Person
              signing on behalf of such registered owner must be stated.)



























                                       B-1-126
<PAGE>






                                      ANNEX B-2

                           FORM OF TRANSFER CERTIFICATE --
                         DEFINITIVE RESTRICTED SECURITIES TO
                   RESTRICTED GLOBAL SECURITY, REGULATION S GLOBAL 
                       SECURITY OR UNRESTRICTED GLOBAL SECURITY


     Marine Midland Bank
     140 Broadway, 12th Floor
     New York, NY 10005-1180
     Attention:  Corporate Trust Department


              Re:     North American Vaccine, Inc.
                      6.50% Convertible Subordinated Notes
                      Due May 1, 2003
                      ---------------

              Reference is  hereby made  to the  Indenture, dated  as of  May 7,
     1996 (the  "Indenture"), between North  American Vaccine, Inc., as  Issuer,
     and  Marine Midland  Bank,  as Trustee.   Capitalized  terms  used but  not
     defined herein shall have the meanings given to them in the Indenture.

              This letter  relates  to U.S.  $_____________ aggregate  principal
     amount  of  Securities  which are  evidenced  by  a  Definitive  Restricted
     Security (No.  ________  in  the  name  of  ___________)  [insert  name  of
     transferor] (the "Transferor").   The Transferor  has requested a  transfer
     of such  interest in  the Securities to  a Person  that will take  delivery
     thereof in the  form of an equal  aggregate principal amount  of Securities
     evidenced  by  the  [Unrestricted Global  Security]  [Regulation  S  Global
     Security] [(CUSIP  No. U65777AA9)].  Restricted  Global Security (CUSIP No.
     657201AA7).]

              In  connection   with  such  request   and  in   respect  of  such
     Securities, the Transferor  does hereby certify  that:   such transfer  has
     been  effected pursuant to  and in  accordance with  Rule 904, Rule  144 or
     Rule 144A under the  United States Securities Act of 1933, as  amended (the
     "Securities  Act")  and  accordingly the  Transferor  does  hereby  further
     certify that:

                      (1) if  the transfer has  been effected  pursuant to  Rule
              904:

                               (A) the offer of the Securities was not made to a
                      person in the United States;

                               (B) either:

                                       (i)  at  the  time  the   buy  order  was
                               originated, the transferee was outside the United
                               States or the Transferor and any person acting on

                                       B-2-127
<PAGE>






                               its   behalf   reasonably   believed   that   the
                               transferee was outside the United States, or

                                       (ii) the  transaction was executed in, on
                               or  through   the  facilities   of  a  designated
                               offshore  securities  market   and  neither   the
                               Transferor  nor any person  acting on  its behalf
                               knows that the transaction was prearranged with a
                               buyer in the United States;

                               (C) no directed selling efforts have been made in
                      contravention of the requirements of 904(b)  of Regulation
                      S, as applicable; and

                               (D)  the  transaction is  not part  of a  plan or
                      scheme  to  evade  the  registration  requirements of  the
                      Securities Act; [and 

                               (E)  if the transfer is made to the Regulation  S
                      Global Security:   the  transferee will  take delivery  in
                      book-entry  form  to  be held  with  the  Depositary  only
                      through Euroclear or CEDEL or both;] 

                      (2) if  the transfer has  been effected  pursuant to  Rule
              144,  the  Securities  have  been  transferred  in  a  transaction
              permitted by Rule 144; or

                      (3)  if the transfer  has been  effected pursuant  to Rule
              144A,  the  Securities  have   been  transferred  to  a  Qualified
              Institutional Buyer.

              This certificate and the statements contained herein  are made for
     the benefit of the Company and the Initial Purchasers.   Terms used in this
     certificate and  not otherwise defined  in the Indenture  have the meanings
     set forth in Regulation S under the Securities Act.

     Dated:                                     [Insert Name of Transferor]

                                                By:  ____________________
                                                      Name:
                                                      Title:

        (If the registered owner is a corporation, partnership or fiduciary, 
            the title of the Person signing on behalf of such registered 
                                owner must be stated.)








                                       B-2-128
<PAGE>




                                      ANNEX B-3

                           FORM OF TRANSFER CERTIFICATE --
                           REGULATION S GLOBAL SECURITY TO
                              RESTRICTED GLOBAL SECURITY

     Marine Midland Bank
     140 Broadway, 12th Floor
     New York, NY 10005-1180
     Attention:  Corporate Trust Department

              Re:     North American Vaccine, Inc.
                      6.50% Convertible Subordinated Notes
                      Due May 1, 2003 (the "Securities")

              Reference is  hereby made  to the  Indenture, dated  as of  May 7,
     1996 (the  "Indenture"), between North American  Vaccine, Inc.,  as Issuer,
     and  Marine Midland  Bank,  as Trustee.   Capitalized  terms  used but  not
     defined herein shall have the meanings given to them in the Indenture.

              This  letter  relates to  U.S.  $____________ aggregate  principal
     amount  of  Securities which  are  evidenced  by  the  Regulation S  Global
     Security (CUSIP  No. U65777AA9) and  held with the  U.S. Depository through
     Euroclear or CEDEL  or both in the name of (insert name of transferor] (the
     "Transferor"). The Transferor  has requested a transfer  of such beneficial
     interest in the Securities  to a Person that will take delivery  thereof in
     the  form of  an equal  principal  amount of  Securities  evidenced by  the
     Restricted Global Security (CUSIP No. 657201AA7).

              In   connection  with   such  request  and  in   respect  of  such
     Securities, the Transferor  does hereby certify that such transfer has been
     effected pursuant  to and  in accordance with  Rule 144A  under the  United
     States Securities Act of 1933,  as amended, and accordingly  the Transferor
     does hereby further certify that the Securities are being  transferred to a
     person   that  the  Transferor   reasonably  believes   is  purchasing  the
     Securities for its  own account, or for  one or more accounts  with respect
     to which such  Person exercises sole investment discretion, and such person
     and  each such  account  is a  "qualified  institutional buyer"  within the
     meaning  of  Rule  144A,  in  each  case  in   a  transaction  meeting  the
     requirements of Rule  144A and in accordance with any applicable securities
     laws of any state of the United States.

              This certificate and the statements contained herein are  made for
     the benefit of the Company and the Initial Purchasers.

     Dated:                                     [Insert Name of Transferor]

                                                By:  ____________________
                                                Name:
                                                Title:

        (If the registered owner is a corporation, partnership or fiduciary, 
            the title of the Person signing on behalf of such registered 
                                owner must be stated.)




                                       B-3-129
<PAGE>






                                      ANNEX C-1

                           FORM OF TRANSFER CERTIFICATE --
                 RESTRICTED GLOBAL SECURITY TO UNRESTRICTED SECURITY

     Marine Midland Bank
     140 Broadway, 12th Floor
     New York, NY 10005-1180
     Attention:  Corporate Trust Department


              Re:     North American Vaccine, Inc.
                      6.50% Convertible Subordinated Notes
                      Due May 1, 2003 (the "Securities")

              Reference  is hereby made  to the  Indenture, dated  as of  May 7,
     1996 (the  "Indenture") between  North American  Vaccine, Inc., as  Issuer,
     and  Marine Midland  Bank,  as Trustee.    Capitalized terms  used but  not
     defined herein shall have the meanings given to them in the Indenture.

              This  letter relates  to  U.S. $____________  aggregate  principal
     amount of Securities  which are evidenced by the Restricted Global Security
     (CUSIP  No. _____________)  and held  with  the Depositary  in the  name of
     ______________  [insert  name  of  transferor]  (the  "Transferor").    The
     Transferor has  requested a  transfer of  such beneficial  interest in  the
     Securities to a  person who  will take  delivery in  the form  of an  equal
     aggregate  principal amount  of Securities  evidenced  by the  Unrestricted
     Global Security (CUSIP No. _________).

              In  connection   with  such  request   and  in   respect  of  such
     Securities, the Transferor  does hereby certify that such transfer has been
     effected pursuant  to and in  accordance with Rule  904  or  Rule 144 under
     the  United States  Securities  Act of  1933,  as amended  (the "Securities
     Act"), and accordingly the Transferor does hereby further certify that:

              (1) if the  transfer has been effected  pursuant to Rule 904,  the
     offer of the Securities was not made to a person in the United States;

                      (A) either:

                               (i) at the time the buy order was originated, the
                      transferee  was   outside   the  United   States  or   the
                      Transferor and any person acting on  its behalf reasonably
                      believed  that  the  transferee  was  outside  the  United
                      States, or

                               (ii)  the  transaction  was  executed  in,  on or
                      through   the   facilities   of   a  designated   offshore
                      securities  market  and  neither  the Transferor  nor  any
                      person acting  on its  behalf knows  that the  transaction
                      was pre-arranged with a buyer in the United States;


                                     C-1-130
<PAGE>






                      (B)  no  directed  selling  efforts  have   been  made  in
              contravention of  the requirements  of 904(b) of Regulation  S, as
              applicable;

                      (C) the  transaction is  not part of  a plan or  scheme to
              evade the registration requirements of the Securities Act; or

              (2) if  the transfer has been  effected pursuant to Rule  144, the
     Securities have been  transferred in a  transaction permitted  by Rule  144
     under the Securities Act.

              This certificate and the  statements contained herein are made for
     the  benefit of the Company and the Initial Purchasers.  Terms used in this
     certificate and  not otherwise defined  in the Indenture  have the meanings
     set forth in Regulation S under the Securities Act.

     Dated:                            [Insert Name of Beneficial Owner]

                                       By:  ____________________
                                             Name:
                                             Title:

                                       (If    the   registered    owner   is   a
                                       corporation,  partnership  or  fiduciary,
                                       the  title   of  the  Person  signing  on
                                       behalf of  such registered owner must  be
                                       stated.)


























                                     C-1-131
<PAGE>






                                      ANNEX C-2

                           FORM OF TRANSFER CERTIFICATE --
                        TRANSFER OR EXCHANGE AFTER THREE YEARS

     Marine Midland Bank
     140 Broadway, 12th Floor
     New York, NY 10005-1180
     Attention:  Corporate Trust Department

              Re:     North American Vaccine, Inc.
                      6.50% Convertible Subordinated Notes
                      Due May 1, 2003 (the "Securities")

              Reference is  hereby made  to the  Indenture, dated  as of  May 7,
     1996 (the  "Indenture") between  North American Vaccine,  Inc., as  Issuer,
     and  Marine  Midland Bank,  as  Trustee.   Capitalized terms  used  but not
     defined herein shall have the meanings given to them in the Indenture.

                               [For  transfers:       This  letter  relates   to
     U.S.$__________________________  aggregate  principal amount  of Securities
     that   are   evidenced   by   a   [Restricted    Global   Security   (CUSIP
     No._____________________)   and held  with the  Depositary in  the name  of
     [insert name  of  beneficial  owner]  [a  Restricted  Security  that  is  a
     Definitive  Security  (CUSIP No._________________________  )  registered in
     the name  of _______________________________________ ]   [and held for  the
     benefit of ___________________________________ ]  (the  "Transferor").  The
     Transferor has requested that  its beneficial  interest in such  Securities
     be transferred to a Person  that will take delivery thereof in  the form of
     an  equal  aggregate  principal  amount  of  Securities  evidenced  by  the
     Unrestricted Global Security (CUSIP No.________________________________)

              In   connection  with   such  request  and  in   respect  of  such
     Securities, the  Transferor does  hereby certify that  upon such  transfer,
     (a)  a period of  at least three years  will have elapsed since  (i) May 7,
     1996 or  (ii)  the resale  of  such Securities  by  an "affiliate"  of  the
     Company  (as  defined in  Rule  144  under  the Securities  Act),  (b)  the
     Transferor during the three months preceding the date of  such transfer was
     not an "affiliate" of the Company, and it was not acting on behalf  of such
     an affiliate and  (c) such Person  to whom such  transfer is being  made is
     not an "affiliate" of the Company.]

                               [For  exchanges:   This  letter  relates  to U.S.
     $__________________________ aggregate  principal amount of Securities  that
     are evidenced  by a [Restricted Security  (CUSIP No.______________________)
     and held with the Depositary in the name of _____________________________
     _________________________________________________________________________  
     [insert name  of  beneficial  owner]  [a  Restricted  Security  that  is  a
     Definitive   Security   (CUSIP   No.___________________________)  that   is
     registered in the name  of __________________  and held for the  benefit of
     ______________________]  (the "Beneficial  Owner").   The  Beneficial Owner
     has requested that  its beneficial interest in such Securities be exchanged

                                     C-1-132
<PAGE>






     for  a  beneficial interest  in  an  equal  aggregate  principal amount  of
     [Securities evidenced by  the Unrestricted  Global Security]  [Unrestricted
     Securities] (CUSIP No. _________________).

              In   connection  with  such  request   and  in  respect   of  such
     Securities,  the  Beneficial Owner  does  hereby  certify  that, upon  such
     exchange, (a) it will  be the  beneficial owner of  such Securities, (b)  a
     period of at least  three years will have elapsed since  (i) May 7, 1996 or
     (ii)  the resale of  such Securities by an  "affiliate" of  the Company and
     (c)  the  Beneficial  Owner  will  not be,  and  during  the  three  months
     preceding the date of  such exchange will not have been, an  "affiliate" of
     the Company (as  defined in Rule 144  under the Securities Act), and  it is
     not acting on behalf of such an affiliate.]

              This certificate and the statements contained herein are made  for
     the benefit of the Company and the Initial Purchasers.  

     Dated:                            [Insert Name of Beneficial Owner]


                                       By:  ____________________
                                            Name:
                                            Title:

                                       (If    the   registered    owner   is   a
                                       corporation,  partnership  or  fiduciary,
                                       the  title  of  the  Person  signing   on
                                       behalf of such registered  owner must  be
                                       stated.)
























                                       C-2-133
<PAGE>

<PAGE>



                             North American Vaccine, Inc.

                 6.50% Convertible Subordinated Notes due May 1, 2003

                            Registration Rights Agreement

                                                                     May 1, 1996

     Goldman, Sachs & Co.
     UBS Securities LLC
     c/o Goldman, Sachs & Co. 
     85 Broad Street 
     New York, New York 10004

     Ladies and Gentlemen:

              North  American  Vaccine,   Inc.,  a  Canadian  corporation   (the
     "Company"), proposes to  issue and  sell to Goldman,  Sachs &  Co. and  UBS
     Securities LLC (the  "Initial Purchasers")  upon the terms  set forth in  a
     purchase agreement dated  May 1,  1996 (the  "Purchase Agreement")  between
     the Initial  Purchasers and the Company, its 6.50% Convertible Subordinated
     Notes Due May 1, 2003 (the "Securities").  As  an inducement to the Initial
     Purchasers to  enter into the Purchase  Agreement and in satisfaction  of a
     condition to  the  obligations of  the Initial  Purchasers thereunder,  the
     Company agrees  with the  Initial Purchasers,  (i) for  the benefit  of the
     Initial Purchasers  and (ii) for  the benefit of  the holders from time  to
     time of the  Securities and the Common  Stock, no par value per  share (the
     "Stock"),  of  the  Company  initially  issuable  upon  conversion  of  the
     Securities  (collectively,  the "Registrable  Securities"),  including  the
     Initial Purchasers (each  of the foregoing  a "Holder"  and, together,  the
     "Holders"), as follows:

              1.      DEFINITIONS.    Capitalized  terms  used  herein   without
     definition shall  have their respective  meanings set forth  in or pursuant
     to the Purchase Agreement  or the Offering Circular, dated May 1,  1996, in
     respect  of  the Securities.    As used  in this  Agreement,  the following
     capitalized defined terms shall have the following meanings:

              "Act" or  "Securities Act" means the United  States Securities Act
     of 1933, as amended.

              "Affiliate" of any specified person means  any other person which,
     directly or indirectly, is  in control  of, is controlled  by, or is  under
     common  control  with   such  specified  person.    For  purposes  of  this
     definition, control  of a person  means the power,  direct or indirect,  to
     direct or  cause  the direction  of the  management  and policies  of  such
     person whether  by contract or  otherwise; and the  terms "controlling" and
     "controlled" have meanings correlative to the foregoing.

              "Commission"  means  the United  States  Securities  and  Exchange
     Commission.
<PAGE>






              "DTC" means The Depository Trust Company.

              "Effectiveness Period"  has the meaning set  forth in Section 2(b)
              hereof.

              "Exchange Act" means the United States Securities Exchange Act  of
     1934, as amended.

              "Managing Underwriters" means the investment banker  or investment
     bankers  and  manager or  managers  that shall  administer  an underwritten
     offering, if any, as set forth in Section 6 hereof.

              "Person"  shall  mean  an  individual,  partnership,  corporation,
     trust  or  unincorporated  organization,  or  a  government  or  agency  or
     political subdivision thereof.

              "Prospectus"   means  the   prospectus  included   in   any  Shelf
     Registration  Statement (including, without  limitation, a  prospectus that
     discloses information previously omitted  from a  prospectus filed as  part
     of an effective  registration statement in  reliance upon  Rule 430A  under
     the Act), as  amended or supplemented  by any  prospectus supplement,  with
     respect  to the terms  of the  offering of  any portion of  the Registrable
     Securities.

              "Shelf Registration"  means  a registration  effected pursuant  to
     Section 2 hereof.

              "Shelf   Registration  Statement"   means  a   shelf  registration
     statement of the  Company pursuant to  the provisions  of Section 2  hereof
     filed with  the Commission  which covers  some or  all  of the  Registrable
     Securities, as applicable, on an appropriate form  under Rule 415 under the
     Act, or any similar rule that may be  adopted by the Commission, amendments
     and  supplements to  such registration  statement, including post-effective
     amendments, in each  case including the Prospectus  contained therein,  all
     exhibits thereto and all material incorporated by reference therein.

              "Underwriter"  means any underwriter of  Registrable Securities in
     connection with an offering thereof under a Shelf Registration Statement.

              2.      SHELF  REGISTRATION.   (a) The  Company  shall, within  90
     days  following the  date of original  issuance (the  "Issue Date")  of the
     Securities,  file  with  the  Commission  a  Shelf  Registration  Statement
     relating  to  the offer  and  sale  of the  Registrable  Securities by  the
     Holders from  time to time  in accordance with the  methods of distribution
     elected  by such Holders and set forth in such Shelf Registration Statement
     and, thereafter, shall  use its reasonable best efforts to cause such Shelf
     Registration Statement  to be declared  effective under the  Act within 180
     calendar  days  after  the  date  of  filing  of  such  Shelf  Registration
     Statement; provided, however, that no Holder shall be entitled  to have the
     Registrable Securities  held  by  it  covered by  such  Shelf  Registration
     unless such Holder is in compliance with Section 3(m) hereof.


                                        - 2 -
<PAGE>






              (b)     The Company shall use its reasonable best efforts:

                      (i)      To   keep   the   Shelf   Registration  Statement
              continuously effective  in order to permit  the Prospectus forming
              part thereof to  be usable by Holders for  a period of three years
              from  the  date  the  Shelf  Registration  Statement  is  declared
              effective  or such  shorter  period that  will terminate  upon the
              earliest of the following: (A) when all the Securities covered  by
              the Shelf Registration Statement  have been sold  pursuant to  the
              Shelf Registration Statement, (B) when all shares of  Stock issued
              upon  conversion of  any such  Securities that  had not  been sold
              pursuant  to  the  Shelf  Registration  Statement have  been  sold
              pursuant to the Shelf Registration Statement and (C) when, in  the
              written  opinion  of  independent  counsel  to  the  Company,  all
              outstanding Registrable  Securities held  by Persons that  are not
              Affiliates  of  the Company  may  be  resold  without registration
              under  the  Act  pursuant to  Rule  144(k) under  the  Act  or any
              successor or analogous provision  thereto (in any such  case, such
              period being called the "Effectiveness Period"); and

                      (ii)     After the effectiveness of the Shelf Registration
              Statement,  promptly upon the  request of any Holder,  to take any
              action  reasonably   necessary  to   register  the  sale   of  any
              Registrable Securities of such Holder and to identify such  Holder
              as a selling securityholder.

     The Company shall  be deemed not to  have used its reasonable  best efforts
     to cause such  Registration Statement to  be declared effective or  to keep
     the Shelf Registration Statement effective during  the Effectiveness Period
     if the Company  voluntarily takes any action  that would result  in Holders
     of Registrable Securities covered thereby not being  able to offer and sell
     any such Registrable  Securities during that period, unless (x) such action
     is  required  by  applicable  law,  rule or  regulation  or  action  of the
     Commission,  or  (y) the  Shelf  Registration Statement  would  require the
     Company to  disclose a material  financing, acquisition or other  corporate
     transaction  or  development,  and  the  Board  of  Directors   shall  have
     determined in good faith that such disclosure is not in the best  interests
     of the Company and its stockholders, and, in the  case of clause (x) above,
     the  Company  thereafter   promptly  complies  with  the   requirements  of
     paragraph 3(i) below.

              3.      REGISTRATION PROCEDURES.    In connection  with any  Shelf
     Registration Statement, the following provisions shall apply:

                      (a)      The   Company  shall   furnish  to   the  Initial
              Purchasers,  prior to  the filing thereof  with the  Commission, a
              copy  of  any Shelf  Registration  Statement,  and  each amendment
              thereof  and  each  amendment   or  supplement,  if  any,  to  the
              Prospectus  included therein  and  shall use  its  reasonable best
              efforts  to reflect in each such document,  when so filed with the
              Commission,  such  comments as  the Initial  Purchasers reasonably
              may propose.

                                        - 3 -
<PAGE>






                      (b)      The  Company shall  take  such action  as  may be
              necessary  so that  (i) any  Shelf Registration Statement  and any
              amendment thereto and any  Prospectus forming part thereof and any
              amendment  or  supplement  thereto   (and  each  report  or  other
              document incorporated therein by  reference in each case) complies
              in all material respects with the Securities Act and the  Exchange
              Act and  the respective rules and regulations thereunder, (ii) any
              Shelf Registration  Statement and any amendment  thereto does not,
              when it  becomes  effective,  contain an  untrue  statement  of  a
              material fact or  omit to  state a  material fact  required to  be
              stated  therein or  necessary to  make the statements  therein not
              misleading  and (iii)  any Prospectus  forming  part of  any Shelf
              Registration Statement,  and any  amendment or supplement  to such
              Prospectus, does  not include an  untrue statement  of a  material
              fact or omit to  state a material fact necessary in order  to make
              the  statements, in  the  light of  the circumstances  under which
              they were made, not misleading.

                      (c)      (1)   The  Company   shall  advise   the  Initial
     Purchasers and, in  the case of clause  (i), the Holders and,  if requested
     by  the  Initial Purchasers  or any  such  Holder, confirm  such  advice in
     writing:

                               (i)     when  a Shelf  Registration Statement and
              any amendment thereto has been filed with the Commission and  when
              the Shelf Registration  Statement or any  post-effective amendment
              thereto has become effective; and

                               (ii)    of  any  request by  the  Commission  for
              amendments or  supplements to the Shelf  Registration Statement or
              the Prospectus included therein or for additional information.

              (2)     The Company  shall advise the  Initial Purchasers and  the
     Holders and,  if requested by  the Initial  Purchasers or any  such Holder,
     confirm such advice in writing of:

                      (i)      the issuance by the  Commission of any stop order
              suspending effectiveness  of the  Shelf Registration  Statement or
              the initiation of any proceedings for that purpose;

                      (ii)     the receipt  by the  Company of any  notification
              with  respect  to the  suspension  of  the  qualification  of  the
              Registrable   Securities  included   therein  for   sale   in  any
              jurisdiction  or  the  initiation   of  any  proceeding  for  such
              purpose; and

                      (iii)    the happening  of  any event  that  requires  the
              making of any  changes in the Shelf Registration Statement  or the
              Prospectus  so  that,  as of  such  date,  the  Shelf Registration
              Statement  and the Prospectus do  not contain an  untrue statement
              of  a  material fact  and do  not  omit to  state a  material fact
              required to be stated therein or necessary to make the  statements

                                        - 4 -
<PAGE>






              therein  (in  the  case  of  the  Prospectus,  in  light  of   the
              circumstances under  which they  were made) not  misleading (which
              advice shall be  accompanied by an instruction to suspend  the use
              of the Prospectus until the requisite changes have been made).

              (d)     The  Company shall  use  its  reasonable best  efforts  to
     prevent the issuance, and if issued to obtain the withdrawal, of any  order
     suspending the  effectiveness of  any Shelf  Registration Statement at  the
     earliest possible time.

              (e)     The  Company  shall,  during   the  Effectiveness  Period,
     furnish  to  each Holder  of  Registrable  Securities included  within  the
     coverage of any  Shelf Registration Statement, without charge, at least one
     copy of such Shelf Registration Statement and any post-effective  amendment
     thereto, including financial statements  and schedules, and, if  the Holder
     so  requests  in  writing,   all  reports,  other  documents  and  exhibits
     (including those incorporated by reference).

              (f)     The  Company   shall,  during  the  Effectiveness  Period,
     deliver  to  each  Holder of  Registrable  Securities  included  within the
     coverage  of any  Shelf  Registration Statement,  without  charge, as  many
     copies of the  Prospectus (including each preliminary  Prospectus) included
     in such  Shelf  Registration  Statement  and any  amendment  or  supplement
     thereto as such  Holder may reasonably  request; and  the Company  consents
     (except   during  the  continuance  of  any   event  described  in  Section
     3(c)(2)(i) or  (iii)) to  the use  of the  Prospectus or  any amendment  or
     supplement   thereto  by  each  of   the  selling  Holders  of  Registrable
     Securities in  connection with  the offering  and sale  of the  Registrable
     Securities covered  by  the  Prospectus  or  any  amendment  or  supplement
     thereto during the Shelf Registration Period.

              (g)     Prior to any  offering of Registrable  Securities pursuant
     to any Shelf Registration Statement,  the Company shall use  its reasonable
     best efforts  to  register or  qualify  or cooperate  with the  Holders  of
     Registrable Securities  included therein  and their  respective counsel  in
     connection  with the  registration  or  qualification of  such  Registrable
     Securities  for offer and  sale under  the securities  or blue sky  laws of
     such jurisdictions  as any such  Holders reasonably request  in writing and
     do any and all  other acts or things  necessary or advisable to  enable the
     offer and sale  in such jurisdictions of the Registrable Securities covered
     by such Shelf Registration Statement:  provided, however, that in  no event
     shall the Company be obligated to (i)  qualify as a foreign corporation  or
     as a dealer in securities in any jurisdiction where it would not  otherwise
     be required  to so  qualify  but for  this Section  3(g) or  (ii) file  any
     general consent to service of process in  any jurisdiction where it is  not
     as of the date hereof then so subject.

              (h)     Unless any Registrable Securities  shall be in  book-entry
     only form,  the Company  shall cooperate  with the  Holders of  Registrable
     Securities  to   facilitate  the   timely  preparation   and  delivery   of
     certificates representing  Registrable Securities  to be  sold pursuant  to
     any Shelf Registration  Statement free of  any restrictive  legends and  in

                                        - 5 -
<PAGE>






     such permitted  denominations and registered  in such names  as Holders may
     request in connection with the  sale of Registrable Securities  pursuant to
     such Shelf Registration Statement.

              (i)     Upon   the  occurrence   of  any   event  contemplated  by
     paragraphs  2(b)(x)  or  3(c)(2)(iii) above,  the  Company  shall  promptly
     prepare  a post-effective amendment to any  Shelf Registration Statement or
     an  amendment or  supplement to the  related Prospectus  or file  any other
     required document so  that, as thereafter  delivered to  purchasers of  the
     Registrable Securities  included therein, the  Prospectus will not  include
     an untrue statement of a material  fact or omit to state any  material fact
     necessary  to  make   the  statements  therein,   in  the   light  of   the
     circumstances under which they were made,  not misleading.  If the  Company
     notifies  the  Holders of  the  occurrence  of  any  event contemplated  by
     paragraphs 2(b)(x)  or 3(c)(2)(iii) above,  the Holders  shall suspend  the
     use  of the Prospectus  until the requisite changes  to the Prospectus have
     been made.

              (j)     Not  later   than  the   effective  date   of  any   Shelf
     Registration Statement hereunder,  the Company shall provide a CUSIP number
     for the Securities registered under such Shelf Registration Statement.

              (k)     The  Company shall  use  its  reasonable best  efforts  to
     comply with  all applicable  rules and  regulations of  the Commission  and
     shall  make  generally available  to  their security  holders  or otherwise
     provide in accordance with  Section 11(a) of the Securities Act as  soon as
     practicable  after the effective date  of the applicable Shelf Registration
     Statement  an earnings statement satisfying the provisions of Section 11(a)
     of the Securities Act.

              (l)     The Company shall  cause the Indenture and  the Securities
     to be qualified under the Trust Indenture Act in a timely manner.

              (m)     The  Company  may   require  each  Holder  of  Registrable
     Securities  to be  sold  pursuant to  any  Shelf Registration  Statement to
     furnish to  the  Company such  information  regarding  the Holder  and  the
     distribution   of  such  Registrable  Securities  as  may  be  required  by
     applicable  law or  regulation  for inclusion  in  such Shelf  Registration
     Statement and may  require each Holder  to execute  an acknowledgment  that
     such Holder  agrees to  be bound by  the terms of  this Agreement,  and the
     Company may exclude  from such  registration the Registrable  Securities of
     any Holder that  fails to furnish such information or acknowledgment within
     a reasonable time after receiving such request.

              (n)     The  Company  shall, if  requested,  promptly  include  or
     incorporate  in a Prospectus  supplement or  post-effective amendment  to a
     Shelf   Registration   Statement,   such  information   as   the   Managing
     Underwriters reasonably agree should be  included therein and to  which the
     Company  does not reasonably object and  shall make all required filings of
     such  Prospectus  supplement   or  post-effective  amendment  as   soon  as
     practicable  after they  are  notified of  the  matters to  be included  or
     incorporated in such Prospectus supplement or post-effective amendment.

                                        - 6 -
<PAGE>






              (o)     The  Company shall  enter into  such customary  agreements
     (including  underwriting agreements  in customary form)  to take  all other
     appropriate actions in  order to expedite or facilitate the registration or
     the  disposition   of  the  Registrable   Securities,  and  in   connection
     therewith, if an underwriting agreement is entered into, cause  the same to
     contain indemnification  provisions and  procedures substantially identical
     to those set  forth in Section 5  (or such other provisions  and procedures
     acceptable to  the  Managing Underwriters,  if  any)  with respect  to  all
     parties to be indemnified pursuant to Section 5.

              (p)     The Company shall:

                      (i)      cause  the  Company's   officers,  directors  and
              employees  to  make  reasonably   available  for  inspection   all
              relevant information  reasonably requested by such  Holders or any
              such  underwriter,  attorney, accountant  or  agent in  connection
              with  any such Shelf  Registration Statement, in each  case, as is
              customary  for  similar  due  diligence   examinations;  provided,
              however,  that any  information that is  designated in  writing by
              the  Company,  in  good  faith, as  confidential  at  the time  of
              delivery of  such information shall  be kept  confidential by such
              Holders or  any such  underwriter, attorney, accountant  or agent,
              unless  such  disclosure  is  made  in  connection  with  a  court
              proceeding  or  required  by  law,  or  such  information  becomes
              available  to  the  public  generally or  through  a  third  party
              without an  accompanying  obligation of  confidentiality  and  the
              Company  may require that  such Holders  or any  such underwriter,
              attorney,   accountant   and   agent  execute   a  confidentiality
              agreement with  respect to such information;  and provided further
              that the foregoing inspection  and information gathering shall, to
              the greatest  extent possible,  be coordinated  on  behalf of  the
              Holders and  the other  parties entitled  thereto by  one  counsel
              designated by and on behalf of such Holders and other parties;

                      (ii)     make such  representations and  warranties to the
              Holders of  Registrable Securities  registered thereunder  and the
              underwriters,  if  any,  in  form,  substance  and  scope  as  are
              customarily  made  by  the  Company  to  underwriters  in  primary
              underwritten offerings  and  covering matters  including, but  not
              limited to, those set forth in the Purchase Agreement;

                      (iii)    obtain  opinions of  counsel to  the Company  and
              updates thereof (which  counsel and  opinions (in form, scope  and
              substance)  shall  be  reasonably  satisfactory  to  the  Managing
              Underwriters,  if any) addressed  to each  selling Holder  and the
              underwriters,  if any,  covering such  matters as  are customarily
              covered in  opinions requested in underwritten  offerings and such
              other matters as  may be reasonably requested by such  Holders and
              underwriters  (it being agreed  that the matters to  be covered by
              such opinion  or written statement  by such  counsel delivered  in
              connection with such opinions shall include in customary form,  as
              of the date  of the opinion and  as of the  effective date of  the

                                        - 7 -
<PAGE>






              Shelf  Registration   Statement  or  most  recent   post-effective
              amendment thereto,  as the  case  may be,  the absence  from  such
              Shelf Registration Statement  and the prospectus included therein,
              as   then  amended   or  supplemented,  including   the  documents
              incorporated  by  reference therein,  of  an  untrue  statement of
              material fact  or the omission  to state therein  a material  fact
              required to be stated therein or necessary to make the  statements
              therein  (in  the  case  of  the  prospectus,  in  light  of   the
              circumstances under which they were made) not misleading;

                      (iv)     obtain "cold comfort" letters and updates thereof
              from the  independent public accountants  of the  Company (and, if
              necessary,   any  other  independent  public  accountants  of  any
              subsidiary of  the Company  or  of any  business acquired  by  the
              Company for which financial statements and financial data are,  or
              are   required  to   be,  included   in  the   Shelf  Registration
              Statement),  addressed   to  each   such  Holder   of  Registrable
              Securities registered thereunder and  the underwriters, if any, in
              customary  form  and  covering  matters  of the  type  customarily
              covered  in  "cold comfort"  letters  in  connection  with primary
              underwritten offerings;

                      (v)      deliver such documents and certificates as may be
              reasonably  requested  by  any   such  Holders  and  the  Managing
              Underwriters, if any, including  those to evidence compliance with
              Section 3(i)  and with any  customary conditions  contained in the
              underwriting  agreement or  other  agreement entered  into  by the
              Company. 

     The  foregoing actions set  forth in clauses (iii),  (iv), (v)  and (vi) of
     this  Section   3(p)  shall  be   performed  at  each   closing  under  any
     underwritten offering to the extent required thereunder.

              (q)     The Company will use  its reasonable best efforts to cause
     the Stock  issuable upon conversion thereof  to be listed  for quotation on
     the American  Stock Exchange,  the New York  Stock Exchange  or the  Nasdaq
     National  Market  on  or   prior  to  the  effective  date  of   any  Shelf
     Registration Statement hereunder.

              (r)     In the event  that any broker-dealer registered  under the
     Exchange Act shall underwrite any Registrable Securities or participate  as
     a member of  an underwriting syndicate or  selling group or "assist  in the
     distribution"  (within the  meaning of the  Rules of Fair  Practice and the
     By-Laws of the  National Association of Securities Dealers,  Inc. ("NASD"))
     thereof, whether  as  a Holder  of  such Registrable  Securities or  as  an
     underwriter, a placement  or sales agent or  a broker or dealer  in respect
     thereof,  or otherwise,  the  Company shall  assist  such broker-dealer  in
     complying  with the  requirements  of such  Rules  and By-Laws,  including,
     without  limitation, by (A) if such  Rules or By-Laws, including Schedule E
     thereto, shall so  require, engaging a "qualified  independent underwriter"
     (as defined in Schedule E) to participate  in the preparation of the  Shelf
     Registration  Statement relating  to  such  Registrable Securities  and  to

                                        - 8 -
<PAGE>






     exercise   usual  standards  of  due  diligence  in  respect  thereto,  (B)
     indemnifying any  such qualified independent underwriter  to the  extent of
     the indemnification  of underwriters provided  in Section 5  hereof and (C)
     providing such  information to  such broker-dealer  as may  be required  in
     order  for such broker-dealer to comply  with the requirements of the Rules
     of Fair Practice of the NASD.

              (s)     The Company shall use its reasonable  best efforts to take
     all other steps necessary to effect the  registration, offering and sale of
     the  Registrable Securities  covered by  the  Shelf Registration  Statement
     contemplated hereby.

              4.      REGISTRATION EXPENSES.   Except as  otherwise provided  in
     Section  6,  the  Company shall  bear  all fees  and  expenses  incurred in
     connection with the performance  of its obligations under Sections 2  and 3
     hereof and shall bear or reimburse the Holders for the reasonable fees  and
     disbursements of  one  firm  of  counsel  designated  by  the  Company  and
     reasonably  acceptable to  the  Holders of  a  majority of  the Registrable
     Securities covered  by the Shelf  Registration Statement to  act as counsel
     therefor in connection with an underwritten public offering.

              5.      INDEMNIFICATION AND CONTRIBUTION.  (a)  In connection with
     any  Shelf Registration  Statement,  the Company  shall indemnify  and hold
     harmless  the  Initial  Purchasers,  each  Holder,   each  underwriter  who
     participates  in an  offering of  Registrable Securities,  each  person, if
     any, who controls  any of such parties within the  meaning of Section 15 of
     the Securities  Act or  Section 20 of  the Exchange Act  and each  of their
     respective   directors,  officers,  employees,   trustees  and  agents,  as
     follows:

              (i)     against any  and all  loss, liability,  claim, damage  and
     expense  whatsoever,  including  any  amounts  paid  in settlement  of  any
     investigation,  litigation,  proceeding  or claim,  joint  or  several,  as
     incurred, arising out of any  untrue statement or alleged  untrue statement
     of a  material fact contained in  any Shelf Registration  Statement (or any
     amendment  thereto)   covering   Registrable  Securities,   including   all
     documents  incorporated therein by  reference, or  the omission  or alleged
     omission therefrom  of a  material fact  required to  be stated therein  or
     necessary to make  the statements therein not misleading  or arising out of
     any  untrue  statement or  alleged  untrue  statement  of  a material  fact
     contained in any  Prospectus (or any  amendment or  supplement thereto)  or
     the omission or alleged omission therefrom of  a material fact necessary in
     order  to make  the statements therein,  in the light  of the circumstances
     under which  they were  made, not  misleading; provided,  that the  Company
     shall not be liable under  this clause (i) for any settlement of any action
     effected  without  its   written  consent,  which  consent   shall  not  be
     unreasonably withheld; and

              (ii)    against  any  and  all  expenses whatsoever,  as  incurred
     (including  reasonable fees  and  disbursements of  counsel  chosen by  the
     Holders, such Holder  or any underwriter  (except to  the extent  otherwise
     expressly  provided  in  Section  5(c)  hereof)),  reasonably  incurred  in

                                        - 9 -
<PAGE>






     investigating,  preparing  or  defending against  any  litigation,  or  any
     investigation or  proceeding by any  court or governmental  agency or body,
     commenced or  threatened,  or any  claim  whatsoever  based upon  any  such
     untrue  statement or  omission,  or any  such  alleged untrue  statement or
     omission,  to  the  extent  that  any  such  expense  is   not  paid  under
     subparagraph (i) of this Section  5(a); provided that this  indemnity shall
     not apply to  any loss, liability, claim,  damage or expense to  the extent
     arising out of an  untrue statement or omission or alleged untrue statement
     or  omission  made   in  reliance  upon  and  in  conformity  with  written
     information  furnished to  the  Company  by  the Initial  Purchasers,  such
     Holder or  any  underwriter  in writing  expressly  for  use in  the  Shelf
     Registration Statement  (or any  amendment thereto)  or any Prospectus  (or
     any amendment or  supplement thereto).  Any amounts advanced by the Company
     to an  indemnified party  pursuant to this  Section 5 as  a result  of such
     losses shall be returned to the Company  if it shall be finally  determined
     by such a court  in a judgment not subject  to appeal or final  review that
     such indemnified party was not entitled to indemnification by the Company.

              (b)     Each  Holder  agrees,   severally  and  not  jointly,   to
     indemnify  and hold  harmless  the Company,  the  Initial Purchasers,  each
     underwriter who participates  in an offering of Registrable  Securities and
     the other selling  Holders and each of their respective directors, officers
     including each officer  of the Company  who signed  the Shelf  Registration
     Statement), employees, trustees  and agents and  each Person,  if any,  who
     controls the Company,  the Initial Purchasers, any underwriter or any other
     selling Holder within  the meaning of Section  15 of the Securities  Act or
     Section  20 of  the  Exchange  Act, from  and  against  any and  all  loss,
     liability,  claim, damage and expense whatsoever described in the indemnity
     contained  in Section 5(a)(i) and  (ii) hereof, as  incurred, but only with
     respect to untrue  statements or omissions, or alleged untrue statements or
     omissions,  made  in the  Shelf  Registration Statement  (or  any amendment
     thereto) or  any Prospectus  (or any  amendment or  supplement thereto)  in
     reliance upon and in conformity  with written information furnished  to the
     Company  by such selling Holder expressly for use in the Shelf Registration
     Statement (for any amendment thereto)  or any Prospectus (or  any amendment
     or supplement  thereto); provided, however,  that, no such  Holder shall be
     liable  for any  claims  hereunder  in excess  of  the amount  of  proceeds
     received by  such Holder from  the sale of  Registrable Securities pursuant
     to the Shelf Registration Statement.

              (c)     Each indemnified  party shall give  prompt notice to  each
     indemnifying  party of any action  commenced against  the indemnified party
     in respect of which indemnity may be sought hereunder, enclosing a copy  of
     all papers served  on such indemnified party,  but failure to so  notify an
     indemnifying party shall not  relieve it of any liability which it may have
     to  the indemnified party  under such subsection  if such  failure does not
     materially prejudice  the indemnifying  party in  the defense  of any  such
     action, and  shall not relieve  such indemnifying party  from any liability
     which it  may have other than  on account of this  indemnity agreement.  An
     indemnifying  party may participate  at its  own expense in  the defense of
     any such action.   If an indemnifying  party so elects within  a reasonable
     time after receipt of such  notice, such indemnifying party,  separately or

                                        - 10 -
<PAGE>






     jointly with any other  indemnifying party, may assume the  defense of such
     action with counsel chosen  by it and approved by the indemnified  party or
     parties defendant in  such action, provided  that if  any such  indemnified
     party reasonably determines that there  may be legal defenses  available to
     such indemnified  party which  are different from  or in addition  to those
     available  to  such  indemnifying  party  or  that  representation  of such
     indemnifying party  and any  indemnified party  by the  same counsel  would
     present a conflict  of interest, then  such indemnifying  party or  parties
     shall not be entitled to assume such  defense.  If an indemnifying party is
     not  entitled to  assume  the defense  of such  action as  a result  of the
     proviso to  the preceding  sentence, counsel  for  such indemnifying  party
     shall be  entitled to conduct  the defense  of such indemnifying  party and
     counsel for such  indemnified party or parties shall be entitled to conduct
     the  defense of  such indemnified  party or  parties.   If  an indemnifying
     party assumes the defense  of an action in accordance with and as permitted
     by  the provisions of this paragraph,  such indemnifying party shall not be
     liable  for any fees  and expenses  of counsel for  the indemnified parties
     incurred thereafter in connection  with such action.  In no event shall the
     indemnifying party or  parties be liable for the  fees and expenses of more
     than one counsel (in  addition to any one local counsel) separate  from the
     indemnifying  parties    own  counsel  for   all  indemnified  parties   in
     connection with  any one action or separate  but similar or related actions
     in the  same jurisdiction arising  out of  the same general  allegations or
     circumstances.

              (d)     In order  to provide for  just and equitable  contribution
     in circumstances  in which  the indemnity provision  agreement provided for
     in  this  Section  5  is for  any  reason  held to  be  unavailable  to the
     indemnified parties although applicable in  accordance with its terms,  the
     Company, the Initial  Purchasers and the  Holders shall  contribute to  the
     aggregate losses, liabilities, claims,  damages and expenses of the  nature
     contemplated  by said  indemnity  agreement incurred  by  the Company,  the
     Initial Purchasers  and the Holders,  as incurred; provided  that no Person
     guilty of fraudulent  misrepresentation (within the meaning  of Section  11
     (f)  of the  Securities Act)  shall be  entitled  to contribution  from any
     Person that  was  not guilty  of  such  fraudulent misrepresentation.    As
     between the Company, the Initial  Purchasers and the Holders,  such parties
     shall contribute  to such  aggregate losses,  liabilities, claims,  damages
     and expenses  of the  nature contemplated  by such  indemnity agreement  in
     such  proportion as shall be  appropriate to reflect  the relative fault of
     the Company, on the  one hand, and the Initial Purchasers and  the Holders,
     on  the other  hand, with  respect  to the  statements  or omissions  which
     resulted in such  loss, liability, claim, damage  or expense, or action  in
     respect thereof,  as well as  any other relevant equitable  considerations.
     The  relative fault  of the Company,  on the one  hand, and  of the Initial
     Purchasers  and the  Holders, on  the other  hand,  shall be  determined by
     reference to,  among other  things, whether  the untrue  or alleged  untrue
     statement of a material fact or the  omission or alleged omission to  state
     a material fact relates to information supplied by the Company, on the  one
     hand, or by or  on behalf of the Initial Purchasers  or the Holders, on the
     other, and the parties'  relative intent, knowledge, access  to information
     and  opportunity to  correct or prevent  such statement  or omission.   The

                                        - 11 -
<PAGE>






     Company,  the  Initial  Purchasers  and  the  Holders  of  the  Registrable
     Securities agree  that it would not  be just and  equitable if contribution
     pursuant to this  Section 5 were to be determined by pro rata allocation or
     by any  other method  of allocation  that does  not take  into account  the
     relevant  equitable considerations.    For purposes  of this  Section 5(d),
     each director,  officer, employee, trustee,  agent and Person,  if any, who
     controls the Initial Purchasers or  a Holder within the meaning  of Section
     15 of the Securities  Act or Section 20 of the  Exchange Act shall have the
     same rights to contribution  as the Initial Purchasers or such  Holder, and
     each director, officer,  employee, trustee and  agent of  the Company,  and
     each Person,  if  any,  who controls  the  Company  within the  meaning  of
     Section 15 of  the Securities Act or  Section 20 of the Exchange  Act shall
     have  the same rights  to contribution as  the Company.  No  party shall be
     liable for contribution  with respect to  any action,  suit, proceeding  or
     claim settled without its written consent.

              6.      UNDERWRITTEN  OFFERING.     The  Holders  of   Registrable
     Securities covered  by the Shelf Registration Statement who desire to do so
     may  sell such Registrable Securities in an  underwritten offering.  In any
     such underwritten  offering, the investment banker  or bankers  and manager
     or managers that will  administer the offering will be selected by, and the
     underwriting  arrangements  with respect  thereto will  be approved  by the
     Holders of a majority of the Registrable Securities  to be included in such
     offering; provided,  however, that (i) such investment bankers and managers
     and  their  counsel  and  underwriting  arrangements   must  be  reasonably
     satisfactory to the Company and (ii) the Company  shall not be obligated to
     arrange for  more than  one underwritten offering  during the Effectiveness
     Period.    No  Holder   may  participate   in  any  underwritten   offering
     contemplated hereby unless  such Holder (a)  agrees to  sell such  Holder s
     Registrable   Securities  in  accordance  with  any  approved  underwriting
     arrangements,  (b) completes  and executes  all reasonable  questionnaires,
     powers of attorney,  indemnities, underwriting agreements,  lock-up letters
     and other documents  required under the terms of such approved underwriting
     arrangements   and  (c)  at  least  40%   of  the  outstanding  Registrable
     Securities  are  included  in such  underwritten  offering.    The  Holders
     participating in  any underwritten  offering shall  be responsible  for any
     expenses  customarily   borne   by   selling   securityholders,   including
     underwriting discounts and  commissions and fees and expenses of counsel to
     the selling  securityholders and shall  reimburse the Company  for the fees
     and  disbursements of  its counsel, its  independent public accountants and
     any  printing  expenses  incurred  in  connection  with  such  underwritten
     offerings.   Notwithstanding  the foregoing  or  the provisions  of Section
     3(n)  hereof, upon  receipt of a  request from the  Managing Underwriter to
     prepare  and file  an  amendment or  supplement  to the  Shelf Registration
     Statement  and Prospectus in connection  with an underwritten offering, the
     Company may delay the filing of any such amendment or  supplement for up to
     90 days if the Company in  good faith has a valid business  reason for such
     delay.





                                        - 12 -
<PAGE>






              7.      MISCELLANEOUS.

              (a)     OTHER  REGISTRATION   RIGHTS.    The  Company   may  grant
     registration rights that would permit any Person that is a third party  the
     right to piggy-back on any  Shelf Registration Statement, provided  that if
     the Managing Underwriter,  if any, of such offering  delivers an opinion to
     the selling Holders that the total amount of securities which they and  the
     holders  of  such  piggyback  rights   intend  to  include  in   any  Shelf
     Registration Statement  is so large  as to materially  adversely affect the
     success of such offering (including the price at  which such securities can
     be sold),  then only the  amount, the number  or kind  of securities to  be
     offered for  the  account of  holders  of such  piggy-back rights  will  be
     reduced to  the extent necessary to  reduce the total  amount of securities
     to be included in  such offering to the amount, number or  kind recommended
     by  the Managing  Underwriter  prior  to any  reduction  in the  amount  of
     Registrable Securities to be included.

              (b)     AMENDMENTS AND  WAIVERS. The provisions of this Agreement,
     including the provisions of this  sentence, may not be  amended, qualified,
     modified or  supplemented, and waivers  or consents to  departures from the
     provisions  hereof  may not  be given,  unless the  written consent  of the
     Company and the Initial Purchasers is obtained.

              (c)     NOTICES.   All notices  and other communications  provided
     for  or permitted  hereunder  shall be  made  in writing  by hand-delivery,
     first-class mail, telex, telecopier, or air  courier guaranteeing overnight
     delivery:

                      (1)      if to a Holder, at the most current address given
              by  such Holder to  the Company in accordance  with the provisions
              of this Section 7(c);

                      (2)      if to the  Initial Purchasers,  initially at  the
              address set forth in the Purchase Agreement; and

                      (3)      if to  the Company, initially at  its address set
              forth in the Purchase Agreement.

     All such  notices and  communications  shall be  deemed to  have been  duly
     given when received.

              The Initial Purchasers  or the Company by notice  to the other may
     designate  additional or  different  addresses  for subsequent  notices  or
     communications.

              (d)     SUCCESSORS AND  ASSIGNS.   This Agreement  shall inure  to
     the benefit of and be  binding upon the successors  and assigns of each  of
     the parties  and the Holders,  including, without the  need for an  express
     assignment or any  consent by the  Company thereto,  subsequent Holders  of
     Registrable Securities.  The Company  hereby agrees to extend  the benefits
     of  this Agreement to  any Holder  of Registrable  Securities and  any such


                                        - 13 -
<PAGE>






     Holder may specifically enforce  the provisions of this Agreement  as if an
     original party hereto.

              (e)     COUNTERPARTS.   This  agreement  may  be executed  in  any
     number of counterparts  and by the 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 .

              (f)     HEADINGS.    The  headings  in  this   agreement  are  for
     convenience of reference only and  shall not limit or otherwise affect  the
     meaning hereof.

              (g)     GOVERNING  LAW.   This agreement shall  be governed by and
     construed in  accordance with the  laws of the  State of New York,  without
     giving effect to any provisions relating to conflicts of laws.

              (h)     SEVERABILITY.  In  the event that  any one or more  of the
     provisions   contained  herein,   or  the   application   thereof  in   any
     circumstances,  is held invalid,  illegal or  unenforceable in  any respect
     for  any reason,  the  validity, legality  and  enforceability of  any such
     provision in every  other respect and  of the  remaining provisions  hereof
     shall not be in  any way  impaired or affected  thereby, it being  intended
     that all of the  rights and privileges of the parties shall  be enforceable
     to the fullest extent permitted by law.

              Please  confirm  that  the  foregoing  correctly  sets  forth  the
     agreement between the Company and you.

                                       Very truly yours,


                                       NORTH AMERICAN VACCINE, INC.


                                       By: /s/ Sharon Mates
                                          -------------------------------
                                           Name:  Sharon Mates, Ph.D.
                                           Title: President

     The  foregoing  Registration  Rights  Agreement  is  hereby  confirmed  and
     accepted as of the date first above written.

     Goldman, Sachs & Co.
     UBS Securities LLC

         By /s/ Goldman, Sachs & Co.
            ---------------------------
              (Goldman, Sachs & Co.)

          Name:  Marcus Colwell 
          Title: Vice President 
                

                                        - 14 -
<PAGE>

<TABLE> <S> <C>

<PAGE>
<ARTICLE> 5
<LEGEND>
THIS SCHEDULE CONTAINS SUMMARY FINANCIAL INFORMATION EXTRACTED FROM THE
COMPANY'S QUARTERLY REPORT ON FORM 10-Q FOR THE THREE MONTHS ENDED MARCH 31, 
1996 AND IS QUALIFIED IN ITS ENTIRETY BY REFERENCE TO SUCH FINANCIAL 
STATEMENTS.
</LEGEND>
<MULTIPLIER> 					 1,000
       
<S>                             <C>
<PERIOD-TYPE>                   3-MOS
<FISCAL-YEAR-END>                          DEC-31-1996
<PERIOD-START>                             JAN-01-1996
<PERIOD-END>                               MAR-31-1996
<CASH>                                          10,012
<SECURITIES>                                     3,234
<RECEIVABLES>                                    1,199
<ALLOWANCES>                                         0
<INVENTORY>                                          0
<CURRENT-ASSETS>                                12,863
<PP&E>                                          29,159
<DEPRECIATION>                                  11,094
<TOTAL-ASSETS>                                  34,675
<CURRENT-LIABILITIES>                            7,982
<BONDS>                                              0
                      	     0
                                      6,538
<COMMON>                                        59,161 
<OTHER-SE>                                    (39,189)
<TOTAL-LIABILITY-AND-EQUITY>                    34,675
<SALES>                                            228
<TOTAL-REVENUES>                                   228
<CGS>                                                0
<TOTAL-COSTS>                                    7,090
<OTHER-EXPENSES>                                     0
<LOSS-PROVISION>                                     0
<INTEREST-EXPENSE>                                   0
<INCOME-PRETAX>                                (2,515)
<INCOME-TAX>                                         0
<INCOME-CONTINUING>                            (2,515)
<DISCONTINUED>                                       0
<EXTRAORDINARY>                                      0
<CHANGES>                                            0
<NET-INCOME>                                   (2,515)
<EPS-PRIMARY>                                   (0.08)
<EPS-DILUTED>                                   (0.08)
        
<PAGE>
</TABLE>


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