CARDINAL HEALTH INC
SC 13D, 1996-07-30
DRUGS, PROPRIETARIES & DRUGGISTS' SUNDRIES
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                                  UNITED STATES
                        SECURITIES AND EXCHANGE COMMISSION
                             WASHINGTON, D.C.  20549



                                   SCHEDULE 13D



                    UNDER THE SECURITIES EXCHANGE ACT OF 1934



                              PCI SERVICES, INC.                        
                                (Name of Issuer) 


                        COMMON STOCK, $0.001 PAR VALUE                  
                          (Title of Class of Securities)

                                   693206104                            
                                  (CUSIP Number)

                                ROBERT D. WALTER,
                              CARDINAL HEALTH, INC.                      
                                5555 GLENDON COURT
                               DUBLIN, OHIO  43016  
                                (614) 717-5000                          
          (Name, Address and Telephone Number of Person Authorized to
                      Receive Notices and Communications)

                                     Copy to:
                                  DAVID A. KATZ
                          WACHTELL, LIPTON ROSEN & KATZ
                               51 WEST 52ND STREET
                            NEW YORK, NEW YORK  10019
                                  (212) 403-1000


                                 JULY 23, 1996                          
             (Date of Event which Requires Filing of this Statement)



         If the filing person has previously filed a statement on
         Schedule 13G to report the acquisition which is the subject of
         this Schedule 13D, and is filing this schedule because of Rule
         13d-1(b)(3) or (4), check the following box / /.

         Check the following box if a fee is being paid with the
         statement /x/.




                                Page 1 of 11 Pages<PAGE>
         


CUSIP NO.  693206104





                                    SCHEDULE 13D


         1.   NAME OF REPORTING PERSON
              SS OR I.R.S. IDENTIFICATION NO. OF ABOVE PERSON

              Cardinal Health, Inc.
              31-0958666

         2.   CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP    (a) / /

                                                                  (b) / /

         3.   SEC USE ONLY

         4.   SOURCE OF FUNDS
              WC

         5.   CHECK BOX IF DISCLOSURE OF LEGAL PROCEEDINGS IS
              REQUIRED PURSUANT TO ITEMS 2(d) OR 2(e)                 / /

         6.   CITIZENSHIP OR PLACE OF ORGANIZATION
              Ohio

         NUMBER OF                          7.  SOLE VOTING POWER
         SHARES                                 0
         BENEFICIALLY
         OWNED BY                           8.  SHARED VOTING POWER
         EACH                                   0
         REPORTING
         PERSON                             9.  SOLE DISPOSITIVE POWER
         WITH                                   0

                                            10. SHARED DISPOSITIVE POWER
                                                0

         11.  AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON
              2,875,000 shares of Common Stock.

         12.  CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES
              CERTAIN SHARES                                          / /

         13.  PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11) 46.3%.
              Based upon 6,211,250 shares of Common Stock outstanding as of
              July 23, 1996, as represented by Issuer, calculated pursuant
              to Rule 13d-3(d)(1).

         14.  TYPE OF REPORTING PERSON
              HC, CO







                                Page 2 of 11 Pages<PAGE>





         Item 1.   Security and Issuer.

                   This Schedule 13D relates to the common stock, $0.001
         par value per share ("PCI Common Stock"), of PCI Services, Inc., a
         Delaware corporation ("PCI").  The principal executive offices of
         PCI are located at 1403 Foulk Road, Suite 102, Wilmington, Delaware
         19803. 
       
         Item 2.   Identity and Background.

                   This Schedule 13D is filed by Cardinal Health, Inc., an
         Ohio corporation ("Cardinal").  Cardinal is a national health care
         service provider, providing an array of value-added pharmaceutical
         distribution services to a broad base of customers nationwide.
         Through its wholly owned subsidiary, Pyxis Corporation, Cardinal
         develops and manufactures point-of-use systems which automate the
         distribution, management and control of medications and supplies
         in hospitals and alternate care facilities.  Cardinal is also a
         franchisor of retail pharmacies through its wholly owned
         subsidiary, Medicine Shoppe International, Inc.  In addition,
         Cardinal's subsidiary Allied Pharmacy Management, Inc. is a
         provider of pharmacy management services to hospitals.  Cardinal's
         principal executive offices are located at 5555 Glendon Court,
         Dublin, Ohio  43016.  

                   Each executive officer and each director of Cardinal is
         a citizen of the United States.  The name, business address and
         present principal occupation of each executive officer and
         director are set forth in Annex I to this Schedule 13D which is
         incorporated herein by this reference.

                   During the last five years, to the best of Cardinal's
         knowledge, neither Cardinal nor any of its executive officers or
         directors has been convicted in a criminal proceeding (excluding
         traffic violations or similar misdemeanors) or has been a party to
         a civil proceeding of a judicial or administrative body of
         competent jurisdiction as a result of which Cardinal or such
         person was or is subject to a judgment, decree or final order
         enjoining future violations of, or prohibiting or mandating
         activities subject to, federal or state securities laws, or
         finding any violation with respect to such laws, and which
         judgment, decree or final order was not subsequently vacated.

         Item 3.   Source and Amount of Funds or Other Consideration.

                   Pursuant to the Stock Option Agreement, dated July 23,
         1996, between Cardinal, MEDIQ Incorporated, a Delaware
         corporation, and MEDIQ Investment Services, Inc., a Delaware
         corporation (together with MEDIQ Incorporated, "MEDIQ") and a
         wholly owned subsidiary of MEDIQ Incorporated, MEDIQ granted
         Cardinal an irrevocable option (the "Option") to purchase from
         MEDIQ, under certain circumstances and subject to certain
         adjustments, all of the issued and outstanding shares of PCI
         Common Stock owned, directly or indirectly, or thereafter


                                Page 3 of 11 Pages<PAGE>





         acquired, directly or indirectly, by MEDIQ, at a price per share,
         payable in cash, equal to the lower of (x) $23.00 or (y) the
         exchange ratio under the Agreement and Plan of Merger, dated as of
         July 23, 1996, among Cardinal, Panther Merger Corp., a Delaware
         corporation and a wholly owned subsidiary of Cardinal ("Subcorp"),
         PCI and MEDIQ Incorporated (the "Merger Agreement"), described
         under Item 4 below, multiplied by the closing price of Cardinal
         common shares, without par value ("Cardinal Common Shares"), as
         reported on the New York Stock Exchange Composite Tape on the last
         trading day immediately preceding the date of delivery to PCI of
         written notice of Cardinal's exercise of the Option.  The Stock
         Option Agreement provides that, notwithstanding the foregoing, in
         no event will such purchase price be less than $19.53 per share.
         As of the date hereof, the Option is not exercisable.  In the
         Stock Option Agreement, MEDIQ has represented to Cardinal that the
         number of shares of PCI Common Stock currently owned by MEDIQ and
         subject to the Option is 2,875,000.  Cardinal may exercise the
         Option in whole or in part; provided that to the extent that
         Cardinal exercises the Option in part, Cardinal may only exercise
         the Option for up to 390,499 shares of PCI Common Stock in the
         aggregate, unless Cardinal exercises the Option for at least
         2,253,876 shares of PCI Common Stock in the aggregate.

                   The Option was granted by MEDIQ as a condition of and in
         consideration for Cardinal entering into the Merger Agreement.

                   The exercise of the Option for the full number of shares
         currently covered thereby would require aggregate funds of
         $65,084,250, based on an exchange ratio of .336 and a closing
         price for Cardinal Common Share of $67.375 on July 25, 1996.  It
         is anticipated that, should the Option become exercisable and
         should Cardinal determine to exercise the Option, Cardinal would
         obtain the funds for purchase from working capital or by borrowing
         from parties whose identity is not yet known.

                   A copy of the Stock Option Agreement is included as
         Exhibit 2.2 to this Schedule 13D and is incorporated herein by
         this reference.  The foregoing description of the Stock Option
         Agreement is qualified in its entirety by reference to such
         exhibit.

         Item 4.   Purpose of Transaction.

                   In connection with the execution of the Stock Option
         Agreement, Cardinal, Subcorp, PCI and MEDIQ Incorporated entered
         into the Merger Agreement, pursuant to which, among other matters
         and subject to the terms and conditions set forth in the Merger
         Agreement, Subcorp will merge with and into PCI, with PCI as the
         surviving corporation (the "Merger").  The Option was granted by
         MEDIQ as a condition of and in consideration for Cardinal entering
         into the Merger Agreement.  Consummation of the Merger is subject
         to certain conditions, including:  (i) receipt of the approval of
         the Merger Agreement by the holders of a majority of the
         outstanding shares of PCI Common Stock; (ii) expiration or


                                Page 4 of 11 Pages<PAGE>





         termination of all waiting periods applicable to the consummation
         of the Merger under the Hart-Scott-Rodino Antitrust Improvements
         Act of 1976, as amended; (iii) registration of the Cardinal Common
         Shares to be issued in the Merger under the Securities Act of
         1933, as amended; (iv) receipt by Cardinal of an accountant's
         letter confirming that the Merger will qualify as a pooling of
         interests transaction for financial reporting purposes; and (v)
         satisfaction of certain other conditions.  Pursuant to the Merger
         Agreement, (a) the officers of the surviving corporation in the
         Merger will be the officers of PCI, (b) the directors of the
         surviving corporation in the Merger will be the directors of
         Subcorp, (c) each share of PCI Common Stock will be converted into
         .336 of a Cardinal Common Shares, subject to adjustment under the
         circumstances described in the Merger Agreement, plus cash in lieu
         of receipt of fractional Cardinal Common Shares, and (d) at the
         effective time of the Merger, the Certificate of Incorporation and
         By-laws of PCI, as the surviving corporation, will be amended to
         be identical (save for the name of the corporation) to those of
         Subcorp.  Upon consummation of the Merger, the PCI Common Stock
         will be delisted from the Nasdaq National Market.

                   A copy of the Merger Agreement is included as Exhibit
         2.1 to this Schedule 13D and is incorporated herein by this
         reference.  The foregoing description of the Merger Agreement is
         qualified in its entirety by reference to such exhibit.

                   Except as set forth herein, Cardinal does not have any
         current plans or proposals that relate to or would result in (i)
         the acquisition by any person of additional shares of PCI Common
         Stock or the disposition of shares of PCI Common Stock; (ii) an
         extraordinary corporate transaction, such as a merger,
         reorganization or liquidation, involving PCI or any of its
         subsidiaries; (iii) a sale or transfer of any material amount of
         assets of PCI or any of its subsidiaries; (iv) any change in the
         present board of directors or management of PCI, including any
         plans or proposals to change the number or term of directors or to
         fill any vacancies on the board; (v) any material change in the
         present capitalization or dividend policy of PCI; (vi) any other
         material change in PCI's business or corporate structure; (vii)
         any change in PCI's charter or bylaws, or instruments
         corresponding thereto, or other actions that may impede the
         acquisition of control of PCI by any person; (viii) causing a
         class of securities of PCI to be delisted from a national
         securities exchange or to cease to be authorized to be quoted in
         an inter-dealer quotation system of a registered national
         securities association; (ix) a class of equity securities of PCI
         becoming eligible for termination of registration pursuant to
         Section 12(g)(4) of the Securities Exchange Act of 1934, as
         amended; or (x) any action similar to any of those enumerated
         above.






                                Page 5 of 11 Pages<PAGE>





         Item 5.   Interest in Securities of Issuer.

                   Although the Option does not allow Cardinal to purchase
         any shares of PCI Common Stock pursuant thereto unless and until
         the conditions to exercise specified in the Stock Option Agreement
         occur, assuming for purposes of this Item 5 that such conditions
         are satisfied and Cardinal is entitled to purchase shares of PCI
         Common Stock pursuant to the Option, Cardinal would currently be
         entitled to purchase 2,875,000 shares of PCI Common Stock, or
         approximately 46.3% of the outstanding PCI Common Stock (based
         upon 6,211,250 shares of PCI Common Stock outstanding as of July
         23, 1996, as represented by PCI in the Merger Agreement).

                   Cardinal does not currently have the right to acquire
         any shares of PCI Common Stock under the Option unless certain
         events specified in the Stock Option Agreement occur.
         Accordingly, Cardinal does not have sole or shared voting or
         dispositive power with respect to any shares of PCI Common Stock,
         and Cardinal disclaims beneficial ownership of PCI Common Stock
         subject to the Option until such events occur.  Assuming for
         purposes of this Item 5 that events occurred that would enable
         Cardinal to exercise the Option and Cardinal exercised the Option,
         Cardinal would have sole voting power and sole dispositive power
         with respect to the shares of PCI Common Stock acquired pursuant
         to the Option.

                   The foregoing description of certain terms of the Stock
         Option Agreement is qualified in its entirety by reference to the
         Stock Option Agreement which is filed as Exhibit 2.2 hereto and
         which is incorporated herein by this reference.  

                   To the best of Cardinal's knowledge, no executive
         officer or director of Cardinal beneficially owns any shares of
         PCI Common Stock, nor (except for the issuance of the Option) have
         any transactions in PCI Common Stock been effected during the past
         60 days by Cardinal or, to the best knowledge of Cardinal, by any
         executive officer or director of Cardinal.  In addition, no other
         person is known by Cardinal to have the right to receive or the
         power to direct the receipt of dividends from, or the proceeds
         from the sale of, the securities covered by this Schedule 13D.

         Item 6.   Contracts, Arrangements, Understandings or Relationships
                   with Respect to Securities of the Issuer.             

                   Each of MEDIQ and the persons set forth in Annex II to
         this Schedule 13D, which Annex II is incorporated herein by this
         reference, has entered into an agreement with Cardinal pursuant to
         which, among other matters, such person has agreed (i) to vote all
         of the shares of PCI Common Stock beneficially owned by such
         person or its affiliates or over which such person or any of its
         affiliates has voting power or control to approve the Merger and
         the Merger Agreement, (ii) not to vote such shares in favor of any
         other recapitalization, merger, consolidation or other business
         combination involving PCI, or acquisition of any capital stock or


                                Page 6 of 11 Pages<PAGE>





         any material portion of the assets (except for acquisitions of
         assets in the ordinary course of business consistent with past
         practice) of PCI and (iii) not to, and not to permit any company,
         trust or other entity controlled by such person to, and not to
         permit any of its affiliates to, contract to sell, sell or
         otherwise transfer or dispose of any of such shares or any
         interest therein or securities convertible thereinto or any voting
         rights with respect thereto other than pursuant to the Merger or
         without Cardinal's consent.  MEDIQ is estimated to have voting
         power over approximately 46.3% of the outstanding shares of PCI
         Common Stock, based upon 6,211,250 shares of PCI Common Stock
         outstanding as of July 23, 1996, as represented by PCI in the
         Merger Agreement.  A copy of the Support/Voting Agreement, dated
         as of July 23, 1996, executed by MEDIQ (the "MEDIQ Support/Voting
         Agreement") is included as Exhibit 99.1 to this Schedule 13D and
         is incorporated herein by this reference.  The foregoing
         description of the MEDIQ Support/Voting Agreement is qualified in
         its entirety by reference to such exhibit.  The persons listed on
         Annex II in the aggregate are estimated to have voting power over
         approximately 3.2% of the outstanding shares of PCI Common Stock
         (assuming such persons exercise all of their outstanding options
         to acquire PCI Common Stock and to vote such shares), based upon
         6,211,250 shares of PCI Common Stock outstanding as of July 23,
         1996, as represented by PCI in the Merger Agreement.  Cardinal may
         hereafter enter into similar agreements with other holders of PCI
         Common Stock.  A copy of the form of Support/Voting Agreement,
         dated as of July 23, 1996, executed by such persons (the "Support/
         Voting Agreement") is included as Exhibit 99.2 to this Schedule
         13D and is incorporated herein by this reference.  The foregoing
         description of the Support/Voting Agreement is qualified in its
         entirety by reference to such exhibit.

                   A copy of the Merger Agreement is included as Exhibit
         2.1 to this Schedule 13D and is incorporated herein by this
         reference.  See Item 4.

                   A copy of the Stock Option Agreement is included as
         Exhibit 2.2 to this Schedule 13D and is incorporated herein by
         this reference.  See Items 3 and 5.

         Item 7.   Material to be Filed as Exhibits.

                   The following exhibits are filed as part of this
         Schedule 13D:

         Exhibit 2.1  --     Merger Agreement

         Exhibit 2.2  --     Stock Option Agreement

         Exhibit 99.1 --     MEDIQ Support/Voting Agreement

         Exhibit 99.2 --     Form of Support/Voting Agreement




                                Page 7 of 11 Pages<PAGE>
          



                                                     ANNEX I


                          Directors and Executive Officers

                   Set forth below are the name and present principal
         occupation of each director and executive officer of Cardinal
         Health, Inc. as of July 26, 1996.  The business address of each
         such director and executive officer is c/o Cardinal Health, Inc.,
         5555 Glendon Court, Dublin, Ohio  43016. 

         Name                     Principal Occupation              

         Directors
         of Cardinal
         Health, Inc.:

         John F. Finn             Chairman and Chief Executive
                                  Officer of Gardner, Inc., an
                                  outdoor power equipment
                                  distributor.

         Robert L. Gerbig         President and Chief Executive
                                  Officer of Gerbig, Snell/
                                  Weisheimer & Associates, Inc., an
                                  advertising agency.

         John F. Havens           Retired Chairman and Director
                                  Emeritus of Banc One Corporation,
                                  a bank holding company.

         Regina E. Herzlinger     Professor, Harvard University
                                  Graduate School of Business
                                  Administration.

         John C. Kane             President and Chief Operating
                                  Officer of Cardinal Health, Inc.

         J. Michael Losh          Executive Vice President and Chief
                                  Financial Officer of General
                                  Motors Corporation, a manufacturer
                                  of automobiles.

         George R. Manser         Chairman of Uniglobe Travel
                                  (Capital Cities) Inc., a travel
                                  planning services company.

         John B. McCoy            Chairman and Chief Executive
                                  Officer of Banc One Corporation, a
                                  bank holding company.

         Jerry E. Robertson       Retired Executive Vice President
                                  of the Life Sciences Sector and
                                  Corporate Services of Minnesota
                                  Mining & Manufacturing Company, a
                                  manufacturer of industrial


                                Page 8 of 11 Pages<PAGE>





                                  commercial, health care and
                                  consumer products.

         L. Jack Van Fossen       Retired President and Chief
                                  Executive Officer of Red Roof
                                  Inns, Inc., a lodging company.

         Robert D. Walter         Chairman and Chief Executive
                                  Officer of Cardinal Health, Inc.

         Melburn G. Whitmire      Vice Chairman of Cardinal Health,
                                  Inc.

         Executive Officers
         of Cardinal Health, Inc.
         (that are not directors):

         David Bearman            Executive Vice President and Chief
                                  Financial Officer.

         George H. Bennett, Jr.   Executive Vice President, General
                                  Counsel and Secretary.

         Anthony J. Campanaro     Executive Vice President-Central
                                  Group.

         James E. Clare           Executive Vice President-Southern
                                  Group.

         Gary E. Close            Executive Vice President-Western
                                  Group.

         Phillip A. Greth         Executive Vice President and Chief
                                  Information Officer.

         James F. Millar          Executive Vice President-Cardinal
                                  Distribution.

         Gordon A. Troup          Executive Vice President-Northern
                                  Group.
















                                Page 9 of 11 Pages<PAGE>
           




                                                    ANNEX II


                     Persons Executing Support/Voting Agreements


         Richard S. Sauter

         Herbert Lotman

         Theodore H. Seidenberg

         Michael J. Rotko

         H. Scott Miller

         Sheldon M. Bonovitz







































                               Page 10 of 11 Pages<PAGE>





                                       SIGNATURE

                   After reasonable inquiry and to the best of my knowledge
         and belief, I certify that the information set forth in this
         statement is true, complete and correct.

                                  CARDINAL HEALTH, INC.


                             By:  /s/ David Bearman
                                  Name:  David Bearman 
                                  Title: Executive Vice President and
                                         Chief Financial Officer

         Dated:  July 29, 1996









































                               Page 11 of 11 Pages<PAGE>





                                    EXHIBIT INDEX

         Exhibit   Description                         

         2.1       Agreement and Plan of
                   Merger, dated July 23,
                   1996, among Cardinal Health, Inc.,
                   Panther Merger Corp., PCI Services,
                   Inc. and MEDIQ Incorporated

         2.2       Stock Option Agreement, dated
                   July 23, 1996, among
                   Cardinal Health, Inc., MEDIQ
                   Investment Services, Inc. and
                   MEDIQ Incorporated

         99.1      Support/Voting Agreement, dated
                   July 23, 1996, among MEDIQ
                   Incorporated, MEDIQ Investment 
                   Services, Inc. and Cardinal Health,
                   Inc.

         99.2      Form of Support/Voting Agreement
                   between Cardinal Health, Inc. and 
                   each of the persons listed on Annex
                   II of the Schedule 13D.

                                                        [CONFORMED COPY]















                           AGREEMENT AND PLAN OF MERGER

                                      AMONG

                              CARDINAL HEALTH, INC.
                                  ("Cardinal"),

                               PANTHER MERGER CORP.
                   a wholly owned direct subsidiary of Cardinal
                                   ("Subcorp"),

                                PCI SERVICES, INC.
                                     ("PCI")



                                       and



                                MEDIQ INCORPORATED
                                    ("MEDIQ")




                                  July 23, 1996<PAGE>







                                TABLE OF CONTENTS


                                                                    PAGE

         AGREEMENT AND PLAN OF MERGER.............................    1
         PRELIMINARY STATEMENTS...................................    1
         AGREEMENT       .........................................    1

         ARTICLE I:  THE MERGER...................................    2
              1.1    The Merger...................................    2
              1.2    Effective Time...............................    2
              1.3    Effects of the Merger........................    2
              1.4    Certificate of Incorporation and Bylaws......    2
              1.5    Directors and Officers.......................    2
              1.6    Additional Actions...........................    2

         ARTICLE II:  CONVERSION OF SECURITIES....................    3
              2.1    Conversion of Capital Stock..................    3
              2.2    Exchange Ratio; Fractional Shares............    3
              2.3    Exchange of Certificates.....................    4
                     (a) Exchange Agent...........................    4
                     (b) Exchange Procedures......................    4
                     (c) Distributions with Respect to 
                          Unexchanged Shares......................    5
                     (d) No Further Ownership Rights in 
                          PCI Common Stock........................    5
                     (e) Termination of Exchange Fund.............    5
                     (f) No Liability.............................    5
                     (g) Investment of Exchange Fund..............    6
              2.4    Treatment of Stock Options...................    6

         ARTICLE III:  REPRESENTATIONS AND WARRANTIES OF 
                       CARDINAL AND SUBCORP.......................    6
              3.1    Organization and Standing....................    7
              3.2    Corporate Power and Authority................    7
              3.3    Capitalization of Cardinal...................    7
              3.4    Conflicts, Consents and Approval.............    7
              3.5    Brokerage and Finder's Fees..................    8
              3.6    Accounting Matters...........................    8
              3.7    Cardinal SEC Documents.......................    8
              3.8    Registration Statement.......................    9

         ARTICLE IV:  REPRESENTATIONS AND WARRANTIES OF 
                       PCI........................................    9
              4.1    Organization and Standing....................    9
              4.2    Subsidiaries.................................   10
              4.3    Corporate Power and Authority................   10
              4.4    Capitalization of PCI........................   10
              4.5    Conflicts; Consents and Approvals............   11


                                       -i-<PAGE>




                                                                    Page


              4.6    No Material Adverse Change...................   12
              4.7    PCI SEC Documents............................   12
              4.8    Taxes........................................   12
              4.9    Compliance with Law..........................   13
              4.10   Intellectual Property........................   13
              4.11   Title to and Condition of Properties.........   15
              4.12   Registration Statement; Proxy Statement......   15
              4.13   Litigation...................................   15
              4.14   Brokerage and Finder's Fees; Expenses........   16
              4.15   Accounting Matters...........................   16
              4.16   Employee Benefit Plans.......................   16
              4.17   Contracts....................................   19
              4.18   Accounts Receivable..........................   20
              4.19   Labor Matters................................   20
              4.20   Undisclosed Liabilities......................   20
              4.21   Operation of PCI's Business; Relationships...   20
              4.22   Permits; Compliance..........................   21
              4.23   Product Warranties and Liabilities...........   21
              4.24   Environmental Matters........................   21
              4.25   Opinion of Financial Advisor.................   22
              4.26   Board Recommendation.........................   22
              4.27   DGCL Section 203 and State Takeover Laws.....   22
              4.28   Employment Agreements........................   22
              4.29   Insurance....................................   22
              4.30   Affiliate Transactions.......................   23

         ARTICLE V:  COVENANTS OF THE PARTIES.....................   23
              5.1    Mutual Covenants.............................   23
                     (a)  General.................................   23
                     (b)  HSR Act.................................   23
                     (c)  Other Governmental Matters..............   23
                     (d)  Pooling-of-Interests....................   24
                     (e)  Tax-Free Treatment......................   24
                     (f)  Public Announcements....................   24
                     (g)  Intercompany Agreements.................   24
              5.2    Covenants of Cardinal........................   24
                     (a)  Preparation of Registration Statement...   24
                     (b)  Indemnification.........................   24
                     (c)  Notification of Certain Matters.........   24
                     (d)  Pooling Press Release...................   25
              5.3    Covenants of PCI and MEDIQ...................   25
                     (a)  PCI Stockholders Meeting................   25
                     (b)  Information for the Registration Statement 
                          and Preparation of Proxy Statement......   25
                     (c)  Conduct of PCI's Operations.............   25
                     (d)  Intellectual Property Matters...........   27
                     (e)  No Solicitation.........................   28
                     (f)  Affiliates of PCI.......................   28
                     (g)  Access..................................   28



                                      -ii-<PAGE>




                                                                    Page


                     (h)  Notification of Certain Matters by PCI..   29
                     (g)  Notification of Certain Matters by MEDIQ   29

         ARTICLE VI:  CONDITIONS..................................   29
              6.1    Mutual Conditions............................   29
              6.2    Conditions to Obligations of PCI.............   30
              6.3    Conditions to Obligations of Cardinal and
                          Subcorp.................................   30

         ARTICLE VII:  TERMINATION AND AMENDMENT..................   32
              7.1    Termination..................................   32
              7.2    Effect of Termination........................   33
              7.3    Amendment....................................   34
              7.4    Extension; Waiver............................   34

         ARTICLE VIII:  MISCELLANEOUS.............................   34
              8.1    Representations and Warranties of MEDIQ......   34
              8.2    Survival of Representations and Warranties...   36
              8.3    Notices......................................   36
              8.4    Interpretation...............................   37
              8.5    Counterparts.................................   37
              8.6    Entire Agreement.............................   37
              8.7    Third Party Beneficiaries....................   37
              8.8    Governing Law................................   37
              8.9    Specific Performance.........................   38
              8.10   Assignment...................................   38
              8.11   Registration Rights..........................   38
              8.12   Expenses.....................................   38


         Exhibit A - Form of Affiliate Letter
         Exhibit B - Opinion of Cardinal's and Subcorp's Counsel
         Exhibit C - Opinion of PCI's Counsel


















                                      -iii-<PAGE>







                           AGREEMENT AND PLAN OF MERGER


                   This Agreement and Plan of Merger (this "Agreement")
         is made and entered into as of the 23rd day of July, 1996, by
         and among Cardinal Health, Inc., an Ohio corporation
         ("Cardinal"), Panther Merger Corp., a Delaware corporation and
         a wholly owned subsidiary of Cardinal ("Subcorp"), PCI
         Services, Inc., a Delaware corporation ("PCI"), and MEDIQ
         Incorporated, a Delaware corporation ("MEDIQ").


                              PRELIMINARY STATEMENTS

                   A.  Cardinal desires to acquire the pharmaceutical
         packaging business and other businesses operated by PCI through
         the merger (the "Merger") of Subcorp with and into PCI, with
         PCI as the surviving corporation, pursuant to which each share
         of PCI Common Stock (as defined in Section 4.4) outstanding at
         the Effective Time (as defined in Section 1.2) will be
         converted into the right to receive Cardinal Common Shares (as
         defined in Section 3.3) as more fully provided herein.

                   B.  PCI desires to combine its pharmaceutical packag-
         ing and other businesses with the wholesale drug distribution
         and related businesses operated by Cardinal and for the holders
         of shares of PCI Common Stock ("PCI Stockholders") to have a
         continuing equity interest in the combined Cardinal/PCI busi-
         nesses.

                   C.  MEDIQ, as the beneficial owner of 2,875,000
         shares of PCI Common Stock, desires that the Merger be
         consummated as soon as practicable.

                   D.  PCI and Cardinal intend that the Merger
         constitute a tax-free "reorganization" within the meaning of
         Section 368(a)(1)(A) of the Internal Revenue Code of 1986, as
         amended (the "Code"), by reason of Section 368(a)(2)(E)
         thereof.

                   E.  The parties intend that the Merger be accounted
         for as a pooling-of-interests for financial reporting purposes.

                   F.  The respective Boards of Directors of Cardinal,
         Subcorp, PCI and MEDIQ have determined the Merger in the manner
         contemplated herein to be desirable and in the best interests
         of their respective shareholders and, by resolutions duly
         adopted, have approved and adopted this Agreement.<PAGE>







                                    AGREEMENT

                   Now, therefore, in consideration of these premises
         and the mutual and dependent promises hereinafter set forth,
         the parties hereto agree as follows:



                                    ARTICLE I

                                    THE MERGER

                   1.1  The Merger.  Upon the terms and subject to the
         conditions hereof, and in accordance with the provisions of the
         Delaware General Corporation Law (the "DGCL"), Subcorp shall be
         merged with and into PCI as soon as practicable following the
         satisfaction or waiver of the conditions set forth in Article
         VI.  Following the Merger, the separate corporate existence of
         Subcorp shall cease and PCI shall continue its existence under
         the laws of the State of Delaware.  PCI, in its capacity as the
         corporation surviving the Merger, is hereinafter sometimes re-
         ferred to as the "Surviving Corporation."

                   1.2  Effective Time.  The Merger shall be consummated
         by filing with the Secretary of State of the State of Delaware
         (the "Delaware Secretary of State") a certificate of merger
         (the "Certificate of Merger") in such form as is required by
         and executed in accordance with Section 251(c) of the DGCL.
         The Merger shall become effective (the "Effective Time") when
         the Certificate of Merger has been filed with the Delaware Sec-
         retary of State or at such later time as shall be specified in
         the Certificate of Merger.  Prior to the filing referred to in
         this Section 1.2, a closing (the "Closing") shall be held at
         the offices of Cardinal, 5555 Glendon Court, Dublin, Ohio
         43016, or such other place as the parties may agree on a date
         (the "Closing Date") specified by Cardinal, which date shall be
         within ten business days following the date upon which all
         conditions set forth in Article VI hereof have been satisfied
         or waived.

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

                   1.4  Certificate of Incorporation and Bylaws.  The
         Certificate of Merger shall provide that at the Effective Time
         (i) the Certificate of Incorporation of the Surviving Corpora-
         tion as in effect immediately prior to the Effective Time shall
         be amended as of the Effective Time so as to contain the provi-
         sions, and only the provisions, contained immediately prior
         thereto in the Certificate of Incorporation of Subcorp, except
         for Article I thereof which shall continue to read "The name of


                                       -2-<PAGE>







         the corporation is 'PCI Services, Inc.'", and (ii) the By-laws
         of Subcorp in effect immediately prior to the Effective Time
         shall be the By-laws of the Surviving Corporation; in each case
         until amended in accordance with applicable law.

                   1.5  Directors and Officers.  From and after the Ef-
         fective Time, the officers of PCI shall be the officers of the
         Surviving Corporation and the directors of Subcorp shall be the
         directors of the Surviving Corporation, in each case until
         their respective successors are duly elected and qualified.  On
         or prior to the Closing Date, PCI shall deliver to Cardinal
         evidence satisfactory to Cardinal of the resignations of the
         directors of PCI, such resignations to be effective as of the
         Effective Time.  

                   1.6  Additional Actions.  If, at any time after the
         Effective Time, the Surviving Corporation shall consider or be
         advised that any further deeds, assignments or assurances in
         law or any other acts are necessary or desirable to (a) vest,
         perfect or confirm, of record or otherwise, in the Surviving
         Corporation its right, title or interest in, to or under any of
         the rights, properties or assets of PCI, or (b) otherwise carry
         out the provisions of this Agreement, PCI and its officers and
         directors shall be deemed to have granted to the Surviving Cor-
         poration an irrevocable power of attorney to execute and de-
         liver all such deeds, assignments or assurances in law and to
         take all acts necessary, proper or desirable to vest, perfect
         or confirm title to and possession of such rights, properties
         or assets in the Surviving Corporation and otherwise to carry
         out the provisions of this Agreement, and the officers and di-
         rectors of the Surviving Corporation are authorized in the name
         of PCI or otherwise to take any and all such action.



                                    ARTICLE II

                             CONVERSION OF SECURITIES

                   2.1  Conversion of Capital Stock.  At the Effective
         Time, by virtue of the Merger and without any action on the
         part of Cardinal, Subcorp or PCI:

                   (a)  Each share of common stock, $0.01 par value, of
              Subcorp issued and outstanding immediately prior to the
              Effective Time shall be converted into one share of common
              stock, $0.01 par value, of the Surviving Corporation.
              Such newly issued shares shall thereafter constitute all
              of the issued and outstanding capital stock of the Surviv-
              ing Corporation.


                                       -3-<PAGE>







                   (b)  Each share of PCI Common Stock issued and out-
              standing immediately prior to the Effective Time shall be
              converted into and represent a number of Cardinal Common
              Shares equal to the Exchange Ratio (as defined below).  

                   (c)  Each share of capital stock of PCI held in the
              treasury of PCI shall be cancelled and retired and no pay-
              ment shall be made in respect thereof.  

                   2.2  Exchange Ratio; Fractional Shares.  The "Ex-
         change Ratio" shall equal (i) if Cardinal has not made an Ad-
         justment Election (as defined in Section 7.1(d)), .336 or (ii)
         if Cardinal has made an Adjustment Election, then the product
         of (x) .336 and (y) the quotient obtained by dividing 58.12 by
         the average of the closing prices of Cardinal Common Shares as
         reported on the New York Stock Exchange ("NYSE") Composite Tape
         ("NYSE Composite Tape") on each of the last 15 trading days
         ending on the sixth trading day prior to the meeting of PCI
         Stockholders at which the vote to approve the Merger occurs
         (the "Average Share Price").  No certificates for fractional
         Cardinal Common Shares shall be issued as a result of the
         conversion provided for in Section 2.1(b).  To the extent that
         an outstanding share of PCI Common Stock would otherwise have
         become a fractional Cardinal Common Share, the holder thereof,
         upon presentation of such fractional interest represented by an
         appropriate certificate for PCI Common Stock to the Exchange
         Agent pursuant to Section 2.3, shall be entitled to receive a
         cash payment therefor in an amount equal to the value (de-
         termined with reference to the closing price of Cardinal Common
         Shares on the NYSE Composite Tape on the last full trading day
         immediately prior to the Effective Time) of such fractional
         interest.  Such payment with respect to fractional shares is
         merely intended to provide a mechanical rounding off of, and is
         not a separately bargained for, consideration.  If more than
         one certificate representing shares of PCI Common Stock shall
         be surrendered for the account of the same holder, the number
         of Cardinal Common Shares for which certificates have been
         surrendered shall be computed on the basis of the aggregate
         number of shares represented by the certificates so
         surrendered.  In the event that prior to the Effective Time
         Cardinal shall declare a stock dividend or other distribution
         payable in Cardinal Common Shares or securities convertible
         into Cardinal Common Shares, or effect a stock split, reclas-
         sification, combination or other change with respect to
         Cardinal Common Shares, the Exchange Ratio set forth in this
         Section 2.2 shall be appropriately adjusted to reflect such
         dividend, distribution, stock split, reclassification,
         combination or other change.




                                       -4-<PAGE>







                   2.3  Exchange of Certificates.

                   (a)  Exchange Agent.  Promptly following the Effec-
         tive Time, Cardinal shall deposit with Boatmen's Trust Company
         or such other exchange agent as may be designated by Cardinal
         (the "Exchange Agent"), for the benefit of PCI Stockholders,
         for exchange in accordance with this Section 2.3, certificates
         representing Cardinal Common Shares issuable pursuant to
         Section 2.1 in exchange for outstanding shares of PCI Common
         Stock and shall from time-to-time deposit cash in an amount
         reasonably expected to be paid pursuant to Section 2.2 (such
         Cardinal Common Shares and cash, together with any dividends or
         distributions with respect thereto, being hereinafter referred
         to as the "Exchange Fund").

                   (b)  Exchange Procedures.  As soon as practicable
         after the Effective Time, the Exchange Agent shall mail to each
         holder of record of a certificate or certificates (the "Cer-
         tificates") which immediately prior to the Effective Time rep-
         resented outstanding shares of PCI Common Stock whose shares
         were converted into the right to receive Cardinal Common Shares
         pursuant to Section 2.1(b) (i) a letter of transmittal (which
         shall specify that delivery shall be effected, and risk of loss
         and title to the Certificates shall pass, only upon delivery of
         the Certificates to the Exchange Agent and shall be in such
         form and have such other provisions as Cardinal may reasonably
         specify) and (ii) instructions for effecting the surrender of
         the Certificates in exchange for certificates representing
         Cardinal Common Shares.  Upon surrender of a Certificate for
         cancellation to the Exchange Agent, together with a duly ex-
         ecuted letter of transmittal, the holder of such Certificate
         shall be entitled to receive in exchange therefor (x) a cer-
         tificate representing that whole number of Cardinal Common
         Shares which such holder has the right to receive pursuant to
         Section 2.1 and (y) a check representing the amount of cash in
         lieu of fractional shares, if any, and unpaid dividends and
         distributions, if any, which such holder has the right to
         receive pursuant to the provisions of this Article II, after
         giving effect to any required withholding tax, and the shares
         represented by the Certificate so surrendered shall forthwith
         be cancelled.  No interest will be paid or accrued on the cash
         in lieu of fractional shares, if any, and unpaid dividends and
         distributions, if any, payable to holders of shares of PCI
         Common Stock.  In the event of a transfer of ownership of
         shares of PCI Common Stock which is not registered on the
         transfer records of PCI, a certificate representing the proper
         number of Cardinal Common Shares, together with a check for the
         cash to be paid in lieu of fractional shares, if any, and
         unpaid dividends and distributions, if any, may be issued to
         such transferee if the Certificate representing such shares of


                                       -5-<PAGE>







         PCI Common Stock held by such transferee is presented to the
         Exchange Agent, accompanied by all documents required to evi-
         dence and effect such transfer and to evidence that any appli-
         cable stock transfer taxes have been paid.  Until surrendered
         as contemplated by this Section 2.3, each Certificate shall be
         deemed at any time after the Effective Time to represent only
         the right to receive upon surrender a certificate representing
         Cardinal Common Shares and cash in lieu of fractional shares,
         if any, and unpaid dividends and distributions, if any, as pro-
         vided in this Article II. 

                   (c)  Distributions with Respect to Unexchanged
         Shares.  Notwithstanding any other provisions of this Agree-
         ment, no dividends or other distributions declared or made af-
         ter the Effective Time with respect to Cardinal Common Shares
         having a record date after the Effective Time shall be paid to
         the holder of any unsurrendered Certificate, and no cash pay-
         ment in lieu of fractional shares shall be paid to any such
         holder, until the holder shall surrender such Certificate as
         provided in this Section 2.3.  Subject to the effect of Appli-
         cable Laws (as defined in Section 4.9), following surrender of
         any such Certificate, there shall be paid to the holder of the
         certificates representing whole Cardinal Common Shares issued
         in exchange therefor, without interest, (i) at the time of such
         surrender, the amount of dividends or other distributions with
         a record date on or after the Effective Time theretofore
         payable with respect to such whole Cardinal Common Shares and
         not paid, less the amount of any withholding taxes which may be
         required thereon, and (ii) at the appropriate payment date
         subsequent to surrender, the amount of dividends or other
         distributions with a record date on or after the Effective Time
         but prior to surrender and a payment date subsequent to
         surrender payable with respect to such whole Cardinal Common
         Shares, less the amount of any withholding taxes which may be
         required thereon.

                   (d)  No Further Ownership Rights in PCI Common Stock.
         All Cardinal Common Shares issued upon surrender of Certifi-
         cates in accordance with the terms hereof (including any cash
         paid pursuant to this Article II) shall be deemed to have been
         issued in full satisfaction of all rights pertaining to such
         shares of PCI Common Stock represented thereby, and there shall
         be no further registration of transfers on the stock transfer
         books of PCI of shares of PCI Common Stock outstanding
         immediately prior to the Effective Time.  If, after the
         Effective Time, Certificates are presented to the Surviving
         Corporation for any reason, they shall be cancelled and ex-
         changed as provided in this Section 2.3.  Certificates sur-
         rendered for exchange by any person constituting an "affiliate"
         of PCI for purposes of Rule 145(c) under the Securities Act of


                                       -6-<PAGE>







         1933, as amended (the "Securities Act"), shall not be exchanged
         until Cardinal has received written undertakings from such
         person in the form attached hereto as Exhibit A. 

                   (e)  Termination of Exchange Fund.  Any portion of
         the Exchange Fund which remains undistributed to PCI Stockhold-
         ers for six months after the Effective Time shall be delivered
         to Cardinal, upon demand thereby, and holders of shares of PCI
         Common Stock who have not theretofore complied with this Sec-
         tion 2.3 shall thereafter look only to Cardinal for payment of
         any claim to Cardinal Common Shares, cash in lieu of fractional
         shares thereof, or dividends or distributions, if any, in re-
         spect thereof.

                   (f)  No Liability.  None of Cardinal, the Surviving
         Corporation or the Exchange Agent shall be liable to any person
         in respect of any shares of PCI Common Stock (or dividends or
         distributions with respect thereto) or cash from the Exchange
         Fund delivered to a public official pursuant to any applicable
         abandoned property, escheat or similar law.  If any Certifi-
         cates shall not have been surrendered prior to seven years af-
         ter the Effective Time of the Merger (or immediately prior to
         such earlier date on which any cash, any cash in lieu of frac-
         tional shares or any dividends or distributions with respect to
         whole shares of PCI Common Stock in respect of such Certificate
         would otherwise escheat to or become the property of any Gov-
         ernmental Authority (as defined in Section 3.4)), any such
         cash, dividends or distributions in respect of such Certificate
         shall, to the extent permitted by Applicable Laws, become the
         property of Cardinal, free and clear of all claims or interest
         of any person previously entitled thereto.

                   (g)  Investment of Exchange Fund.  The Exchange Agent
         shall invest any cash included in the Exchange Fund, as di-
         rected by Cardinal, on a daily basis.  Any interest and other
         income resulting from such investments shall be paid to
         Cardinal upon termination of the Exchange Fund pursuant to
         Section 2.3(e).  

                   2.4  Treatment of Stock Options.

                   (a)  Prior to the Effective Time, Cardinal and PCI
         shall take all such actions as may be necessary to cause each
         unexpired and unexercised option under stock option plans of
         PCI in effect on the date hereof which has been granted to
         current or former directors, officers or key employees of PCI
         by PCI (each, an "PCI Option") to be automatically converted at
         the Effective Time into an option (a "Cardinal Exchange
         Option") to purchase that number of Cardinal Common Shares
         equal to the number of shares of PCI Common Stock issuable


                                       -7-<PAGE>







         immediately prior to the Effective Time upon exercise of the
         PCI Option (without regard to actual restrictions on
         exercisability) multiplied by the Exchange Ratio, with an
         exercise price equal to the exercise price which existed under
         the corresponding PCI Option divided by the Exchange Ratio, and
         with other terms and conditions that are the same as the terms
         and conditions of such PCI Option immediately before the
         Effective Time (including, without limitation, to the extent
         provided as of the date hereof in the plans and agreements
         covering such PCI Options (copies of which have been provided
         to PCI or filed as exhibits to the PCI SEC Documents (as
         defined in Section 4.7)), the ability to exercise such Cardinal
         Exchange Options through "cashless exercises"); provided that
         with respect to any PCI Option that is an "incentive stock
         option" within the meaning of Section 422 of the Code, the
         foregoing conversion shall be carried out in a manner sat-
         isfying the requirements of Section 424(a) of the Code.  In
         connection with the issuance of Cardinal Exchange Options,
         Cardinal shall (i) reserve for issuance the number of Cardinal
         Common Shares that will become subject to Cardinal Exchange Op-
         tions pursuant to this Section 2.4 and (ii) from and after the
         Effective Time, upon exercise of Cardinal Exchange Options,
         make available for issuance all Cardinal Common Shares covered
         thereby, subject to the terms and conditions applicable
         thereto. 

                   (b)  PCI agrees to issue treasury shares of PCI, to
         the extent available, upon the exercise of PCI Options prior to
         the Effective Time.

                   (c)  Cardinal agrees to file with the Securities and
         Exchange Commission (the "Commission") within one month after
         the Closing Date a registration statement on Form S-8 or other
         appropriate form under the Securities Act to register Cardinal
         Common Shares issuable upon exercise of the Cardinal Exchange
         Options and use its reasonable efforts to cause such registra-
         tion statement to remain effective until the exercise or expi-
         ration of all of such Cardinal Exchange Options.



                                   ARTICLE III

              REPRESENTATIONS AND WARRANTIES OF CARDINAL AND SUBCORP

                   In order to induce PCI and MEDIQ to enter into this
         Agreement, Cardinal and Subcorp hereby represent and warrant to
         PCI and MEDIQ that the statements contained in this Article III
         are true, correct and complete.  



                                       -8-<PAGE>







                   3.1  Organization and Standing.  Each of Cardinal and
         Subcorp is a corporation duly organized, validly existing and
         in good standing under the laws of its state of incorporation
         with full power and authority (corporate and other) to own,
         lease, use and operate its properties and to conduct its busi-
         ness as and where now owned, leased, used, operated and con-
         ducted.  Each of Cardinal and Subcorp is duly qualified to do
         business and in good standing in each jurisdiction in which the
         nature of the business conducted by it or the property it owns,
         leases or operates, makes such qualification necessary, except
         where the failure to be so qualified or in good standing in
         such jurisdiction would not have a material adverse effect on
         Cardinal.  Cardinal is not in default in the performance,
         observance or fulfillment of any provision of its Articles of
         Incorporation, as amended and restated (the "Cardinal
         Articles"), or Code of Regulations, as amended and restated,
         and Subcorp is not in default in the performance, observance or
         fulfillment of any provisions of its Certificate of Incorpora-
         tion or Bylaws.

                   3.2  Corporate Power and Authority.  Each of Cardinal
         and Subcorp has all requisite corporate power and authority to
         enter into this Agreement and to consummate the transactions
         contemplated by this Agreement.  The execution and delivery of
         this Agreement and the consummation of the transactions contem-
         plated hereby have been duly authorized by all necessary corpo-
         rate action on the part of each of Cardinal and Subcorp.  This
         Agreement has been duly executed and delivered by each of
         Cardinal and Subcorp, and constitutes the legal, valid and
         binding obligation of each of Subcorp and Cardinal enforceable
         against each of them in accordance with its terms.

                   3.3  Capitalization of Cardinal.  As of July 22,
         1996, Cardinal's authorized capital stock consisted solely of
         (a) 100,000,000 common shares, without par value ("Cardinal
         Common Shares"), of which (i) 63,989,830 shares were issued and
         outstanding, (ii) 223,098 shares were issued and held in
         treasury (which does not include the shares reserved for issu-
         ance as set forth in clause (a)(iii) below) and (iii) 5,264,145
         shares were reserved for issuance upon the exercise or
         conversion of options, warrants or convertible securities
         granted or issuable by Cardinal, (b) 5,000,000 Class B common
         shares, without par value ("Cardinal Class B Common Shares"),
         none of which was issued and outstanding or reserved for issu-
         ance, and (c) 500,000 Non-Voting Preferred Shares, without par
         value, none of which was issued and outstanding or reserved for
         issuance.  Each outstanding share of Cardinal capital stock is,
         and all Cardinal Common Shares to be issued in connection with
         the Merger will be, duly authorized and validly issued, fully
         paid and nonassessable, and each outstanding share of Cardinal


                                       -9-<PAGE>







         capital stock has not been, and all Cardinal Common Shares to
         be issued in connection with the Merger will not be, issued in
         violation of any preemptive or similar rights.  As of the date
         hereof, other than as set forth in the first sentence hereof or
         in Section 3.3 to the disclosure schedule (the "Cardinal Dis-
         closure Schedule") delivered by Cardinal to PCI and dated the
         date hereof, there are no outstanding subscriptions, options,
         warrants, puts, calls, agreements, understandings, claims or
         other commitments or rights of any type relating to the issu-
         ance, sale or transfer by Cardinal of any equity securities of
         Cardinal, nor are there outstanding any securities which are
         convertible into or exchangeable for any shares of capital
         stock of Cardinal.

                   3.4  Conflicts, Consents and Approval.  Neither the
         execution and delivery of this Agreement by Cardinal or Subcorp
         nor the consummation of the transactions contemplated hereby
         will:

                   (a)  conflict with, or result in a breach of any pro-
              vision of the Cardinal Articles or Code of Regulations, as
              amended and restated, of Cardinal or the Certificate of
              Incorporation or Bylaws of Subcorp;

                   (b)  violate, or conflict with, or result in a breach
              of any provision of, or constitute a default (or an event
              which, with the giving of notice, the passage of time or
              otherwise, would constitute a default) under, or entitle
              any party (with the giving of notice, the passage of time
              or otherwise) to terminate, accelerate, modify or call a
              default under, or result in the creation of any lien, se-
              curity interest, charge or encumbrance upon any of the
              properties or assets of Cardinal or any of its subsidiar-
              ies under, any of the terms, conditions or provisions of
              any note, bond, mortgage, indenture, deed of trust, li-
              cense, contract, undertaking, agreement, lease or other
              instrument or obligation to which Cardinal or any of its
              subsidiaries is a party;

                   (c)  violate any order, writ, injunction, decree,
              statute, rule or regulation, applicable to Cardinal or any
              of its subsidiaries or their respective properties or as-
              sets; or

                   (d)  require any action or consent or approval of, or
              review by, or registration or filing by Cardinal or any of
              its affiliates with any third party or any local, domestic
              or foreign court, arbitral tribunal, administrative agency
              or commission or other governmental or regulatory body,



                                       -10-<PAGE>







              agency, instrumentality or authority (a "Governmental Au-
              thority"), other than (i) authorization for inclusion of
              the Cardinal Common Shares to be issued in the Merger and
              the transactions contemplated hereby (including upon
              exercise of the Cardinal Exchange Options) on the NYSE,
              subject to official notice of issuance, (ii) actions
              required by the Hart-Scott-Rodino Antitrust Improvements
              Act of 1976, as amended, and the rules and regulations
              promulgated thereunder (the "HSR Act"), (iii)
              registrations or other actions required under federal and
              state securities laws as are contemplated by this Agree-
              ment, (v) consents or approvals of any Governmental
              Authority set forth in Section 3.4 to the Cardinal
              Disclosure Schedule; 

         except in the case of (b), (c) and (d) for any of the foregoing
         that would not, individually or in the aggregate, have a mate-
         rial adverse effect on Cardinal.

                   3.5  Brokerage and Finder's Fees.  Except for
         Cardinal's obligation to Smith Barney Inc. ("Smith Barney"),
         neither Cardinal nor any shareholder, director, officer or em-
         ployee thereof, has incurred or will incur on behalf of
         Cardinal, any brokerage, finder's or similar fee in connection
         with the transactions contemplated by this Agreement.

                   3.6  Accounting Matters.  Neither Cardinal nor any of
         its affiliates has taken or agreed to take any action that
         (without giving effect to any actions taken or agreed to be
         taken by PCI or any of its affiliates) would prevent Cardinal
         from accounting for the business combination to be effected by
         the Merger as a pooling-of-interests for financial reporting
         purposes.

                   3.7  Cardinal SEC Documents.  Cardinal has timely
         filed with the Commission all forms, reports, schedules, state-
         ments and other documents required to be filed by it since
         December 31, 1991 under the Securities Exchange Act of 1934, as
         amended (together with the rules and regulations thereunder,
         the "Exchange Act") or the Securities Act (such documents, as
         supplemented and amended since the time of filing, collec-
         tively, the "Cardinal SEC Documents").  The Cardinal SEC Docu-
         ments, including, without limitation, any financial statements
         or schedules included therein, at the time filed (and, in the
         case of registration statements and proxy statements, on the
         dates of effectiveness and the dates of mailing, respectively)
         (a) did not contain any untrue statement of a material fact or
         omit to state a material fact required to be stated therein or
         necessary in order to make the statements therein, in light of
         the circumstances under which they were made, not misleading,


                                       -11-<PAGE>







         and (b) complied in all material respects with the applicable
         requirements of the Exchange Act and the Securities Act, as the
         case may be.  The financial statements of Cardinal included in
         the Cardinal SEC Documents at the time filed (and, in the case
         of registration statements and proxy statements, on the date of
         effectiveness and the date of mailing, respectively) complied
         as to form in all material respects with applicable accounting
         requirements and with the published rules and regulations of
         the Commission with respect thereto, were prepared in ac-
         cordance with generally accepted accounting principles applied
         on a consistent basis during the periods involved (except as
         may be indicated in the notes thereto or, in the case of unau-
         dited statements, as permitted by Form 10-Q of the Commission),
         and fairly present (subject in the case of unaudited statements
         to normal, recurring audit adjustments) the consolidated finan-
         cial position of Cardinal and its consolidated subsidiaries as
         at the dates thereof and the consolidated results of their op-
         erations and cash flows for the periods then ended.

                   3.8  Registration Statement.  None of the information
         provided by Cardinal for inclusion in the registration state-
         ment on Form S-4 to be filed with the Commission by Cardinal
         under the Securities Act, including the prospectus relating to
         Cardinal Common Shares to be issued in the Merger and the proxy
         statement and form of proxy relating to the vote of PCI
         Stockholders with respect to the Merger (as amended,
         supplemented or modified, the "Proxy Statement") contained
         therein (such registration statement as amended, supplemented
         or modified, the "Registration Statement"), at the time the
         Registration Statement becomes effective or, in the case of the
         Proxy Statement, at the date of mailing, will contain any
         untrue statement of a material fact or omit to state any mate-
         rial fact required to be stated therein or necessary in order
         to make the statements therein, in light of the circumstances
         under which they are made, not misleading.  Each  of the
         Registration Statement and Proxy Statement, except for such
         portions thereof that relate only to PCI or MEDIQ, will comply
         as to form in all material respects with the provisions of the
         Securities Act and Exchange Act, as applicable.



                                    ARTICLE IV

                      REPRESENTATIONS AND WARRANTIES OF PCI

                   In order to induce Subcorp and Cardinal to enter into
         this Agreement, PCI hereby represents and warrants to Cardinal
         and Subcorp that the statements contained in this Article IV
         are true, correct and complete.  


                                       -12-<PAGE>







                   4.1  Organization and Standing.  PCI is a corporation
         duly organized, validly existing and in good standing under the
         laws of the State of Delaware with full power and authority
         (corporate and other) to own, lease, use and operate its prop-
         erties and to conduct its business as and where now owned,
         leased, used, operated and conducted.  Each of PCI and its
         subsidiaries is duly qualified to do business and in good
         standing in each jurisdiction listed in Section 4.2 to the dis-
         closure schedule (the "PCI Disclosure Schedule") delivered by
         PCI to Cardinal and dated the date hereof, is not qualified to
         do business in any other jurisdiction and neither the nature of
         the business conducted by it nor the property it owns, leases
         or operates requires it to qualify to do business as a foreign
         corporation in any other jurisdiction, except where the failure
         to be so qualified or in good standing in such jurisdiction
         would not have a material adverse effect on PCI.  PCI is not in
         default in the performance, observance or fulfillment of any
         provision of its Certificate of Incorporation, as amended and
         restated, or Bylaws.

                   4.2  Subsidiaries.  PCI does not own, directly or
         indirectly, any equity or other ownership interest in any cor-
         poration, partnership, joint venture or other entity or en-
         terprise, except for the subsidiaries as set forth in Section
         4.2 to the PCI Disclosure Schedule.  Except as set forth in
         Section 4.2 to the PCI Disclosure Schedule, PCI is not subject
         to any obligation or requirement to provide funds to or make
         any investment (in the form of a loan, capital contribution or
         otherwise) in any such entity.  PCI owns directly or indirectly
         each of the outstanding shares of capital stock (or other own-
         ership interests having by their terms ordinary voting power to
         elect a majority of directors or others performing similar
         functions with respect to such subsidiary) of each of PCI's
         subsidiaries.  Except as set forth in Section 4.2 to the PCI
         Disclosure Schedule, each of the outstanding shares of capital
         stock of each of PCI's subsidiaries is duly authorized, validly
         issued, fully paid and nonassessable, and is owned, directly or
         indirectly, by PCI free and clear of all liens, pledges, secu-
         rity interests, claims or other encumbrances.  The following
         information for each subsidiary of PCI is set forth in Section
         4.2 to the PCI Disclosure Schedule, as applicable:  (i) its
         name and jurisdiction of incorporation or organization; (ii)
         its authorized capital stock or share capital; and (iii) the
         number of issued and outstanding shares of capital stock or
         share capital and the record owner(s) thereof.  Other than as
         set forth in Section 4.2 to the PCI Disclosure Schedule, there
         are no outstanding subscriptions, options, warrants, puts,
         calls, agreements, understandings, claims or other commitments
         or rights of any type relating to the issuance, sale or trans-
         fer of any securities of any subsidiary of PCI, nor are there


                                       -13-<PAGE>







         outstanding any securities which are convertible into or ex-
         changeable for any shares of capital stock of any subsidiary of
         PCI; and no subsidiary of PCI has any obligation of any kind to
         issue any additional securities or to pay for securities of any
         subsidiary of PCI or any predecessor thereof.

                   4.3  Corporate Power and Authority.  PCI has all req-
         uisite corporate power and authority to enter into this Agree-
         ment and, subject to authorization of the Merger and the trans-
         actions contemplated hereby by PCI Stockholders, to consummate
         the transactions contemplated by this Agreement.  The execution
         and delivery of this Agreement and the consummation of the
         transactions contemplated hereby have been duly authorized by
         all necessary corporate action on the part of PCI, subject to
         authorization of the Merger and the transactions contemplated
         hereby by PCI Stockholders.  This Agreement has been duly ex-
         ecuted and delivered by PCI and constitutes the legal, valid
         and binding obligation of PCI enforceable against it in ac-
         cordance with its terms.

                   4.4  Capitalization of PCI.  As of July 23, 1996,
         PCI's authorized capital stock consisted solely of (a)
         25,000,000 shares of common stock, $0.001 par value per share
         ("PCI Common Stock"), of which (i) 6,211,250 shares were issued
         and outstanding, (ii) 715,000 shares were issued and held in
         treasury (which does not include the shares reserved for issu-
         ance set forth in clause (iii) below) and (iii) 470,000 shares
         were reserved for issuance upon the exercise or conversion of
         outstanding options, warrants or convertible securities granted
         or issued by PCI with an average weighted exercise price of
         $10.3032, and (b) 10,000,000 shares of preferred stock, $0.001
         par value per share ("PCI Preferred Stock"), none of which was
         issued and outstanding or reserved for issuance.  Each out-
         standing share of PCI capital stock is duly authorized and val-
         idly issued, fully paid and nonassessable, and has not been
         issued in violation of any preemptive or similar rights.  Other
         than as set forth in the first sentence hereof, or in Section
         4.4 to the PCI Disclosure Schedule, there are no outstanding
         subscriptions, options, warrants, puts, calls, agreements,
         understandings, claims or other commitments or rights of any
         type relating to the issuance, sale or transfer of any
         securities of PCI by PCI, nor are there outstanding any securi-
         ties which are convertible into or exchangeable for any shares
         of capital stock of PCI; and PCI has no obligation of any kind
         to issue any additional securities or to pay for securities of
         PCI or any predecessor.  The issuance and sale of all of the
         shares of capital stock described in this Section 4.4 have been
         in compliance with federal and state securities laws.  Section
         4.4 to the PCI Disclosure Schedule accurately sets forth the
         names of, and the number of shares issuable upon exercise of


                                       -14-<PAGE>







         PCI Options, and the exercise price with respect thereto and
         the number of options and warrants held by, all holders of
         options or warrants to purchase PCI capital stock.  Except as
         set forth in Section 4.4 to the PCI Disclosure Schedule, PCI
         has not agreed to register any securities under the Securities
         Act or under any state securities law or granted registration
         rights to any person or entity.

                   4.5  Conflicts; Consents and Approvals.  Neither the
         execution and delivery of this Agreement by PCI, nor the con-
         summation of the transactions contemplated hereby will:

                   (a)  conflict with, or result in a breach of any pro-
              vision of the Certificate of Incorporation, as amended and
              restated, or Bylaws of PCI;

                   (b)  violate, or conflict with, or result in a breach
              of any provision of, or constitute a default (or an event
              which, with the giving of notice, the passage of time or
              otherwise, would constitute a default) under, or entitle
              any party (with the giving of notice, the passage of time
              or otherwise) to terminate, accelerate, modify or call a
              default under, or result in the creation of any lien, se-
              curity interest, charge or encumbrance upon any of the
              properties or assets of PCI or any of its subsidiaries
              under, any of the terms, conditions or provisions of any
              note, bond, mortgage, indenture, deed of trust, license,
              contract, undertaking, agreement, lease or other instru-
              ment or obligation to which PCI or any of its subsidiaries
              is a party;

                   (c)  violate any order, writ, injunction, decree,
              statute, rule or regulation applicable to PCI or any of
              its subsidiaries or any of their respective properties or
              assets; or

                   (d)  require any action or consent or approval of, or
              review by, or registration or filing by PCI or any of its
              affiliates with any third party or any Governmental Au-
              thority, other than (i) authorization of the Merger and
              the transactions contemplated hereby by PCI Shareholders,
              (ii) actions required by the HSR Act, (iii) registrations
              or other actions required under federal and state securi-
              ties laws as are contemplated by this Agreement and (iv)
              consents or approvals of any Governmental Authority set
              forth in Section 4.5 to the PCI Disclosure Schedule.

         except in the case of (b) for any of the foregoing that are set
         forth in Section 4.5 to the PCI Disclosure Schedule, and in the



                                       -15-<PAGE>







         case of (b) (solely with respect to items other than those re-
         lating to indebtedness of PCI or its subsidiaries), (c) and (d)
         for any of the foregoing that would not, individually or in the
         aggregate, have a material adverse effect on PCI.

                   4.6  No Material Adverse Change.  Except as set forth
         in Section 4.6 to the PCI Disclosure Schedule, since September
         30, 1995, PCI has conducted its business in the ordinary
         course, consistent with past practice, and there has been no
         (i) material adverse change in the assets, liabilities, pros-
         pects, results of operations, business or financial condition
         of PCI and its subsidiaries taken as a whole or (ii) material
         adverse effect on the ability of PCI to consummate the trans-
         actions contemplated hereby.

                   4.7  PCI SEC Documents.  PCI has timely filed with
         the Commission, and has heretofore delivered to Cardinal true,
         correct and complete copies of, all forms, reports, schedules,
         statements and other documents required to be filed by it since
         December 31, 1991 under the Exchange Act or the Securities Act
         (such documents, as supplemented and amended since the time of
         filing, collectively, the "PCI SEC Documents").  The PCI SEC
         Documents, including, without limitation, any financial state-
         ments or schedules included therein, at the time filed (and, in
         the case of registration statements and proxy statements, on
         the dates of effectiveness and the dates of mailing, respec-
         tively) (a) did not contain any untrue statement of a material
         fact or omit to state a material fact required to be stated
         therein or necessary in order to make the statements therein,
         in light of the circumstances under which they were made, not
         misleading, and (b) complied in all material respects with the
         applicable requirements of the Exchange Act and the Securities
         Act, as the case may be.  The financial statements of PCI in-
         cluded in the PCI SEC Documents at the time filed (and, in the
         case of registration statements and proxy statements, on the
         date of effectiveness and the date of mailing, respectively)
         complied as to form in all material respects with applicable
         accounting requirements and with the published rules and regu-
         lations of the Commission with respect thereto, were prepared
         in accordance with generally accepted accounting principles
         applied on a consistent basis during the periods involved (ex-
         cept as may be indicated in the notes thereto or, in the case
         of unaudited statements, as permitted by Form 10-Q of the Com-
         mission), and fairly present (subject in the case of unaudited
         statements to normal, recurring audit adjustments) the consoli-
         dated financial position of PCI as at the dates thereof and the
         consolidated results of its operations and cash flows for the
         periods then ended.




                                       -16-<PAGE>







                   4.8  Taxes.  PCI has duly filed all federal, and
         state, local and foreign income, franchise, material excise,
         real and personal property and other tax returns and reports
         (including, but not limited to, those filed on a consolidated,
         combined or unitary basis) required to have been filed by PCI
         prior to the date hereof.  All of the foregoing returns and
         reports are true and correct (except for such inaccuracies
         which are individually, or in the aggregate, not material), and
         PCI has paid or, prior to the Effective Time, will pay all
         taxes, interest and penalties required to be paid in respect of
         the periods covered by such returns or reports or shown as due
         to any federal, state, foreign, local or other taxing author-
         ity.  PCI has paid or made adequate provision in the financial
         statements of PCI included in the PCI SEC Documents for all
         taxes payable in respect of all periods ending on or prior to
         June 30, 1996.  Neither PCI nor any of its subsidiaries will
         have any material liability for any taxes in excess of the
         amounts so paid or reserves so established and neither PCI nor
         any of its subsidiaries is delinquent in the payment of any
         material tax, assessment or governmental charge and none of
         them has requested any extension of time within which to file
         any returns in respect of any fiscal year which have not since
         been filed.  No deficiencies for any tax, assessment or govern-
         mental charge have been proposed in writing, asserted or as-
         sessed (tentatively or definitely) to PCI or any of its subsid-
         iaries, in each case, by any taxing authority, against PCI or
         any of its subsidiaries for which there are not adequate re-
         serves.  Except as set forth in Section 4.8 to the PCI Disclo-
         sure Schedule, neither PCI nor any of its subsidiaries is the
         subject of any tax audit.  Except as set forth in Section 4.8
         to the PCI Disclosure Schedule, as of the date of this Agree-
         ment, there are no pending requests for waivers of the time to
         assess any such tax, other than those made in the ordinary
         course and for which payment has been made or there are ade-
         quate reserves.  Except as set forth in Section 4.8 to the PCI
         Disclosure Schedule, the federal income tax returns of PCI and
         its subsidiaries have been audited by the Internal Revenue Ser-
         vice through the fiscal year ending September 30, 1993.  For
         the purposes of this Agreement, the term "tax" shall include
         all federal, state, local and foreign taxes including interest
         and penalties thereon.  PCI has not filed an election under
         Section 341(f) of the Code to be treated as a consenting corpo-
         ration.  

                   4.9  Compliance with Law.  Except as set forth in
         Section 4.9 to the PCI Disclosure Schedule, PCI is in compli-
         ance with, and at all times since December 31, 1991 has been in
         compliance with, all applicable laws, statutes, orders, rules,
         regulations, policies or guidelines promulgated, or judgments,



                                       -17-<PAGE>







         decisions or orders entered by any Governmental Authority (col-
         lectively, "Applicable Laws") relating to PCI or its business
         or properties, including, without limitation, laws regarding
         the Federal Controlled Substances Act of 1970, the Food, Drug
         and Cosmetic Act, any federal or state Pharmacy Practice Acts,
         the Good Manufacturing Practices standards of the Food and Drug
         Administration, Controlled Substance Acts, Dangerous Drugs Acts
         and Food, Drug and Cosmetic Acts, the Occupational Safety and
         Health Act and the regulations promulgated thereunder ("OSHA")
         and all rules of professional conduct applicable to PCI or by
         which any of its properties are bound or subject, except where
         the failure to be in compliance therewith would not have a ma-
         terial adverse effect on PCI.  PCI has heretofore provided
         Cardinal with copies of all citations heretofore issued to PCI
         under OSHA and made available copies of all material
         correspondence from and to the Occupational Safety and Health
         Administration or any other Governmental Authority.  

                   4.10  Intellectual Property.

                   (a)  Set forth in Section 4.10 to the PCI Disclosure
         Schedule is a true and complete list of (i) all of PCI's for-
         eign and domestic material patents, patent applications, inven-
         tion disclosures, trademarks, service marks, tradenames (and
         any registrations or applications for registration for any of
         the foregoing) and all material design right and copyright ap-
         plications and registrations and (ii) all material agreements
         to which PCI is a party which concern any of the Intellectual
         Property ("Intellectual Property" shall mean all intellectual
         property or other proprietary rights of every kind, including,
         without limitation, all domestic or foreign patents, patent
         applications, inventions (whether or not patentable), pro-
         cesses, products, technologies, discoveries, copyrightable and
         copyrighted works, apparatus, trade secrets, trademarks and
         trademark applications and registrations, service marks and
         service mark applications and registrations, trade names, trade
         dress, copyright registrations, design rights, customer lists,
         marketing and customer information, mask works rights, know-
         how, licenses, technical information (whether confidential or
         otherwise), software, and all documentation thereof).  Other
         than the Intellectual Property set forth in Section 4.10 to the
         PCI Disclosure Schedule, no name, patent, invention, trade se-
         cret, proprietary right, computer software, trademark, trade
         name, service mark, logo, copyright, franchise, license, subli-
         cense, or other such right is necessary for the operation of
         the business of PCI in substantially the same manner as such
         business is presently or proposed to be conducted.  Except as
         set forth in Section 4.10 to the PCI Disclosure Schedule, to
         the knowledge of PCI, (i) PCI owns, free and clear of any
         liens, claims or encumbrances, the Intellectual Property and


                                       -18-<PAGE>







         has the exclusive right to bring actions for the infringement
         thereof; (ii) all of the patents, trademark registrations, ser-
         vice mark registrations, and design right registrations, and
         copyright registrations included in the Intellectual Property
         are valid (other than, in each case, defects which are immate-
         rial with respect to such Intellectual Property); (iii) the In-
         tellectual Property does not infringe and has not infringed any
         now existing or subsequently issued domestic or foreign patent,
         trademark, service mark, tradename, copyright, design right or
         other intellectual property or proprietary right; (iv) no per-
         son or entity has asserted to PCI that, with respect to the
         Intellectual Property, PCI or a licensee of PCI is infringing
         or has infringed any domestic or foreign patent, trademark,
         service mark, tradename, or copyright or design right, or has
         misappropriated or improperly used or disclosed any trade se-
         cret, confidential information or know-how; (v) PCI has no in-
         formation which would form the basis for any belief that any of
         the Intellectual Property, or its use or operation, infringe,
         or have infringed, any foreign or domestic patent, trademark,
         service mark, tradename or copyright of any entity or have in-
         volved the misappropriation or improper use or disclosure of
         any trade secrets, confidential information or know-how of any
         entity; (vi) all working requirements and all fees, annuities,
         and other payments which are due from PCI on or before the ef-
         fective date of this Agreement for any of the Intellectual
         Property, including, without limitation, all material foreign
         or domestic patents, patent applications, trademarks registra-
         tions, service mark registrations, copyright registrations and
         any applications for any of the preceding, have been met or
         paid; (vii) the claims made in the material foreign or domestic
         patents and patent applications that are a part of the Intel-
         lectual Property are not dominated by claims of patents owned
         by other persons or entities; (viii) the making, using, sell-
         ing, manufacturing, marketing, licensing, reproduction, distri-
         bution, or publishing of any process, machine, manufacture,
         composition of matter, or material pursuant to any part of the
         Intellectual Property, does not and will not infringe any do-
         mestic or foreign patent, trademark, service mark, tradename,
         copyright or other intellectual property right; (ix) no unex-
         pired foreign or domestic patents or patent applications exist
         that are adverse to the material interests of PCI; (x) the In-
         tellectual Property is not the subject of any pending Action;
         (xi) no part of the Intellectual Property was obtained through
         inequitable conduct or fraud in the United States Patent and
         Trademark Office or any foreign governmental entity; (xii) PCI
         is not aware of any (a) prior act that would adversely affect,
         void or invalidate any of the Intellectual Property or (b) con-
         duct or use by PCI or any third party that would adversely af-
         fect, void or invalidate any of the Intellectual Property;



                                       -19-<PAGE>







         (xiii) the execution, delivery and performance of this Agree-
         ment by PCI, and the consummation of the transactions contem-
         plated thereby, will not breach, violate or conflict with any
         instrument or agreement governing or contained within any of
         the Intellectual Property, will not cause the forfeiture or
         termination or give rise to a right of forfeiture or termina-
         tion of any of the Intellectual Property or materially impair
         the right of Cardinal or Subcorp to use, sell, license or
         dispose of, or to bring any action for the infringement of, any
         Intellectual Property; (xiv) there are no material royalties,
         honoraria, fees or other payments payable to any third party by
         reason of the ownership, use, license, sale or disposition of
         the Intellectual Property; (xv) no part of the source or object
         code, algorithms or structure included in any of the Intel-
         lectual Property is copied from, based upon, or derived from
         any source or object code, algorithm or structure included in
         any computer software product owned by any third party nor does
         any substantial similarity of any of such source or object
         code, algorithms or structure to any computer software product
         owned by any third party result from such source or object
         code, algorithms or structure being copied from, based upon or
         derived from any computer software product owned by any third
         party; and (xvi) no software included in the Intellectual Prop-
         erty contains any "Self-Help Code," i.e., any back door, time
         bomb, drop dead device, or other software routine designed to
         disable a computer program automatically with the passage of
         time or under the positive control of any unauthorized person,
         or, to PCI's knowledge, any "Unauthorized Code," i.e., any vi-
         rus, Trojan horse, worm, or other software routines or hardware
         components designed to permit unauthorized access, disable,
         erase, or otherwise harm software, hardware, or data or to per-
         form any other such actions.

                   (b)  PCI has taken all reasonably appropriate steps
         to safeguard and maintain the secrecy and confidentiality of
         all trade secrets contained in the Intellectual Property.

                   (c)  PCI has taken all reasonably appropriate steps
         to safeguard and maintain all copyrights and patents contained
         in the Intellectual Property.  

                   4.11  Title to and Condition of Properties.  PCI owns
         or holds under valid leases all real property, plants, machin-
         ery and equipment necessary for the conduct of the business of
         PCI as presently conducted, except where the failure to own or
         hold such property, plants, machinery and equipment would not
         have a material adverse effect on PCI.  Section 4.11 to the PCI
         Disclosure Schedule lists, and PCI has furnished to Cardinal,
         copies of all third party and internal environmental or other



                                       -20-<PAGE>







         reports prepared by or for PCI with respect to the real
         property owned, leased or used by PCI in PCI's possession.

                   4.12  Registration Statement; Proxy Statement.  None
         of the information provided by PCI for inclusion in the Regis-
         tration Statement at the time it becomes effective or, in the
         case of the Proxy Statement, at the date of mailing, will con-
         tain any untrue statement of a material fact or omit to state a
         material fact required to be stated therein or necessary in
         order to make the statements therein, in light of the circum-
         stances under which they were made, not misleading.  The Regis-
         tration Statement and Proxy Statement, except for such portions
         thereof that relate only to Cardinal and its subsidiaries, will
         each comply as to form in all material respects with the provi-
         sions of the Securities Act and the Exchange Act, as
         applicable.

                   4.13  Litigation.  Except as set forth in Section
         4.13 to the PCI Disclosure Schedule, there is no suit, claim,
         action, proceeding or investigation (an "Action) pending or, to
         the knowledge of PCI (or its officers or directors), threatened
         against PCI or any officer or director of PCI which, individu-
         ally or in the aggregate, if adversely determined, would have a
         material adverse effect on PCI or a material adverse effect on
         the ability of PCI to consummate the transactions contemplated
         hereby.  PCI is not subject to any outstanding order, writ,
         injunction or decree which, individually or in the aggregate,
         insofar as can be reasonably foreseen by PCI, would have a ma-
         terial adverse effect on PCI or a material adverse effect on
         the ability of PCI to consummate the transactions contemplated
         hereby.  Except as set forth in Section 4.13 to the PCI Disclo-
         sure Schedule, since December 31, 1991, (i) there has not been
         any Action asserted, or to the knowledge of PCI, threatened
         against PCI relating to PCI's method of doing business or its
         relationship with past, existing or future users or purchasers
         of any goods or services of PCI and (ii) PCI has not been sub-
         ject to any outstanding order, writ, injunction or decree re-
         lating to PCI's method of doing business or its relationship
         with past, existing or future lessees, users, purchasers or
         licensees of any Intellectual Property, goods or services of
         PCI.

                   4.14  Brokerage and Finder's Fees; Expenses.  Except
         for PCI's obligations to Lehman Brothers ("Lehman") (a copy of
         the written agreement relating to such obligations having pre-
         viously been provided to Cardinal), neither PCI nor any
         director, officer, employee or (to the knowledge of PCI)
         stockholder thereof, has incurred or will incur on behalf of
         PCI, any brokerage, finder's or similar fee in connection with
         the transactions contemplated by this Agreement.  Section 4.14


                                       -21-<PAGE>







         to the PCI Disclosure Schedule discloses the maximum aggregate
         amount of all fees and expenses which will be paid or will be
         payable by PCI to all attorneys, accountants and investment
         bankers in connection with the Merger ("Merger Fees").  

                   4.15  Accounting Matters.  Neither PCI nor any of its
         affiliates has taken or agreed to take any action that (without
         giving effect to any actions taken or agreed to be taken by
         Cardinal or any of its affiliates) would prevent Cardinal from
         accounting for the business combination to be effected by the
         Merger as a pooling-of-interests for financial reporting
         purposes.

                   4.16  Employee Benefit Plans.

                   (a)  For purposes of this Section 4.16, the following
         terms have the definitions given below:

                        "Controlled Group Liability" means any and all
                   liabilities under (i) Title IV of ERISA, (ii) section
                   302 of ERISA, (iii) sections 412 and 4971 of the
                   Code, (iv) the continuation coverage requirements of
                   section 601 et seq. of ERISA and section 4980B of the
                   Code, and (v) corresponding or similar provisions of
                   foreign laws or regulations, in each case other than
                   pursuant to the Plans.

                        "ERISA" means the Employee Retirement Income
                   Security Act of 1974, as amended, and the regulations
                   thereunder.

                        "ERISA Affiliate" means, with respect to any
                   entity, trade or business, any other entity, trade or
                   business that is a member of a group described in
                   Section 414(b), (c), (m) or (o) of the Code or Sec-
                   tion 4001(b)(1) of ERISA that includes the first en-
                   tity, trade or business, or that is a member of the
                   same "controlled group" as the first entity, trade or
                   business pursuant to Section 4001(a)(14) of ERISA.

                        "Foreign Plan" means a Plan providing compensa-
                   tion or benefits to any employee who is, or former
                   employee who was, employed outside the United States,
                   or any beneficiary or dependent thereof.

                        "Plans" means all employment agreements and all
                   employee benefit plans, programs, policies, prac-
                   tices, and other arrangements providing incentive
                   compensation, pension, profit sharing, deferred com-
                   pensation, stock option, medical, dental, disability


                                       -22-<PAGE>







                   or life insurance benefits to any employee or former
                   employee or beneficiary or dependent thereof, whether
                   or not written, and whether covering one person or
                   more than one person, sponsored or maintained by PCI
                   or any of its subsidiaries or to which PCI or any of
                   its subsidiaries contributes or is obligated to con-
                   tribute.  Without limiting the generality of the
                   foregoing, the term "Plans" includes all employee
                   welfare benefit plans within the meaning of Section
                   3(1) of ERISA and all employee pension benefit plans
                   within the meaning of Section 3(2) of ERISA.

                        "Withdrawal Liability" means liability to a Mul-
                   tiemployer Plan as a result of a complete or partial
                   withdrawal from such Multiemployer Plan, as those
                   terms are defined in Part I of Subtitle E of Title IV
                   of ERISA.

                   (b)  Section 4.16(b) to the PCI Disclosure Schedule
         lists all Plans, and specifically identifies those Plans that
         are Foreign Plans.  With respect to each Plan, PCI has made
         available to Cardinal a true, correct and complete copy of:
         (i) each writing constituting a part of such Plan, including
         without limitation all plan documents, benefit schedules, trust
         agreements, and insurance contracts and other funding vehicles;
         (ii) the most recent Annual Report (Form 5500 Series) and ac-
         companying schedule, if any; (iii) the current summary plan
         description or corresponding filing with respect to any Foreign
         Plan, if any; (iv) the most recent annual financial report, if
         any; and (v) the most recent determination letter from the IRS,
         if any.

                   (c)  Except as set forth in Section 4.16(c) to the
         PCI Disclosure Schedule, the Internal Revenue Service has is-
         sued a favorable determination letter with respect to each Plan
         that is intended to be a "qualified plan" within the meaning of
         Section 401(a) of the Code (a "Qualified Plan") and there are
         no existing circumstances nor any events that have occurred
         that could adversely affect the qualified status of any Quali-
         fied Plan or the related trust.  Each Plan that is intended to
         be tax-qualified or registered in any non-U.S. jurisdiction is
         so qualified or registered.  Each Foreign Plan that is intended
         to qualify for any favorable tax status or treatment meets all
         requirements for such status or treatment.

                   (d)  All contributions required to be made to any
         Plan by Applicable Laws or by any plan document or other con-
         tractual undertaking, and all premiums due or payable with re-
         spect to insurance policies funding any Plan, for any period
         through the date hereof have been timely made or paid in full


                                       -23-<PAGE>







         and through the Closing Date will be timely made or paid in
         full or, to the extent not required to be made or paid on or
         before the date hereof or the Closing Date, as applicable, have
         been or will be fully reflected in the PCI SEC Documents filed
         or to be filed with the Commission.

                   (e)  Except as set forth in Section 4.16(c) to the
         PCI Disclosure Schedule, PCI and its subsidiaries have com-
         plied, and are now in compliance, in all material respects,
         with all provisions of ERISA, the Code and all laws and regula-
         tions applicable to the Plans.  Except as set forth in Section
         4.16(c), with respect to each Foreign Plan, PCI and its subsid-
         iaries have complied, and are now in compliance, in all
         material respects with all laws and regulations applicable to
         such Foreign Plans.  Except as set forth in Section 4.16(c) to
         the PCI Disclosure Schedule, each Plan has been operated in
         compliance with its terms.  There is not now, and there are no
         existing, circumstances that could give rise to, any
         requirement for the posting of security with respect to a Plan
         or the imposition of any lien on the assets of PCI or any of
         its subsidiaries under ERISA or the Code or, with respect to a
         Foreign Plan, any other law or regulation applicable to such
         Foreign Plan.

                   (f)  Except as set forth in Section 4.16(f) to the
         PCI Disclosure Schedule, no Plan is a "multiemployer plan"
         within the meaning of Section 4001(a)(3) of ERISA (a "Multiem-
         ployer Plan") or a plan that has two or more contributing spon-
         sors at least two of whom are not under common control, within
         the meaning of Section 4063 of ERISA (a "Multiple Employer
         Plan"), nor has PCI or any of its subsidiaries or any of their
         respective ERISA Affiliates, at any time within five years be-
         fore the date hereof, contributed to or been obligated to con-
         tribute to any Multiemployer Plan or Multiple Employer Plan.
         With respect to each Multiemployer Plan, except as set forth in
         Section 4.16(f) to the PCI Disclosure Schedule: (i) neither PCI
         nor any of its ERISA Affiliates has incurred any Withdrawal
         Liability that has not been satisfied in full; (ii) if PCI or
         any of its ERISA Affiliates were to experience a withdrawal or
         partial withdrawal from such plan, no Withdrawal Liability
         would be incurred; and (iii) neither PCI nor any ERISA Affili-
         ate has received any notification, nor has any reason to be-
         lieve, that any such plan is in reorganization, has been termi-
         nated, or may reasonably be expected to be in reorganization or
         to be terminated.  No Plan (other than a Multiemployer Plan) is
         subject to Title IV of ERISA, and no Plan has any accumulated
         funding deficiency, whether or not waived. 

                   (g)  There does not now exist, and there are no ex-
         isting circumstances that could result in, any Controlled Group


                                       -24-<PAGE>







         Liability that would be a material liability of PCI or any of
         its subsidiaries following the Closing.  Without limiting the
         generality of the foregoing, neither PCI nor any of its sub-
         sidiaries nor any of their respective ERISA Affiliates has en-
         gaged in any transaction described in Section 4069 or Section
         4204 of ERISA.

                   (h)  Except for health continuation coverage as re-
         quired by Section 4980B of the Code or Part 6 of Title I of
         ERISA and as disclosed in Section 4.16(h) to the PCI Disclosure
         Schedule, neither PCI nor any of its subsidiaries has any li-
         ability for life, health, medical or other welfare benefits to
         former employees or beneficiaries or dependents thereof.

                   (i)  Except as set forth in Section 4.16(i) to the
         PCI Disclosure Schedule, neither the execution and delivery of
         this Agreement nor the consummation of the transactions con-
         templated hereby will result in, cause the accelerated vesting
         or delivery of, or increase the amount or value of, any payment
         or benefit to any employee of PCI or any of its subsidiaries.
         Without limiting the generality of the foregoing and except as
         set forth in Section 4.16(i) to the PCI Disclosure Schedule, no
         amount paid or payable by PCI or any of its subsidiaries in
         connection with the transactions contemplated hereby either
         solely as a result thereof or as a result of such transactions
         in conjunction with any other events will be an "excess para-
         chute payment" within the meaning of Section 280G of the Code.

                   (j)  There are no pending claims or claims threatened
         in writing (other than claims for benefits in the ordinary
         course), lawsuits or arbitrations which have been asserted or
         instituted against the Employee Plans, any fiduciaries thereof
         with respect to their duties to the Employee Plans or the as-
         sets of any of the trusts under any of the Employee Plans which
         could reasonably be expected to result in any material li-
         ability of PCI or any of its subsidiaries to the Pension Ben-
         efit Guaranty Corporation, the Department of Treasury, the De-
         partment of Labor or any multiemployer plan.

                   (k)  Section 4.16(k) to the PCI Disclosure Schedule
         sets forth the names of all directors and officers of PCI, the
         total salary, bonus, fringe benefits and perquisites each re-
         ceived in the fiscal year ended September 30, 1995, and any
         changes to the foregoing which have occurred subsequent to Sep-
         tember 30, 1995; Section 4.16(k) to the PCI Disclosure Schedule
         also lists and describes the current compensation of any other
         employee of PCI whose fiscal year 1995 salary and bonus ex-
         ceeded $100,000 annually and any other employee who is substan-
         tially certain to receive in excess of $100,000 in salary and
         bonus in fiscal year 1996.  Except as disclosed in Section


                                       -25-<PAGE>







         4.16(k) to the PCI Disclosure Schedule, there are no other ma-
         terial forms of compensation paid to any such director, officer
         or employee of PCI.  Except as set forth in Section 4.16(k) to
         the PCI Disclosure Schedule, no officer, director, or employee
         of PCI or any other affiliate of PCI, or any immediate family
         member of any of the foregoing, provides or causes to be pro-
         vided to PCI any material assets, services or facilities and
         PCI does not provide or cause to be provided to any such of-
         ficer, director, employee or affiliate, or any immediate family
         member of any of the foregoing, any material assets, services
         or facilities. 

                   4.17  Contracts.  Section 4.17 to the PCI Disclosure
         Schedule lists all written or oral contracts, agreements, guar-
         antees, leases and executory commitments (each a "Contract") to
         which PCI is a party and which fall within any of the following
         categories: (a) Contracts not entered into in the ordinary
         course of PCI's business, (b) joint venture, partnership and
         like agreements, (c) Contracts which are service contracts (ex-
         cluding contracts for delivery services entered into in the
         ordinary course of business) or equipment leases involving pay-
         ments by PCI of more than $200,000 per year, (d) Contracts con-
         taining covenants purporting to limit the freedom of PCI to
         compete in any line of business in any geographic area or to
         hire any individual or group of individuals, (e) Contracts
         which after the Effective Time would have the effect of limit-
         ing the freedom of Cardinal or its subsidiaries (other than PCI
         and its subsidiaries) to compete in any line of business in any
         geographic area or to hire any individual or group of individu-
         als, (f) Contracts which contain minimum purchase conditions or
         requirements or other terms that restrict or limit the purchas-
         ing relationships of PCI or any lessee thereof, (g) Contracts
         relating to any outstanding commitment for capital expenditures
         in excess of $250,000, (h) Contracts relating to the lease or
         sublease of or sale or purchase of real or personal property
         involving any annual expense or price in excess of $175,000 and
         not cancellable by PCI (without premium or penalty) within one
         month, (i) Contracts with any labor organization, (j) inden-
         tures, mortgages, promissory notes, loan agreements, guarantees
         of amounts in excess of $250,000, letters of credit or other
         agreements or instruments of PCI or commitments for the borrow-
         ing or the lending of amounts in excess of $250,000 or by PCI
         or providing for the creation of any charge, security interest,
         encumbrance or lien upon any of the assets of PCI, (k) Con-
         tracts involving annual revenues or expenditures to the busi-
         ness of PCI in excess of 1.0% of PCI's annual revenues, (l)
         Contracts providing for "earn-outs" or other contingent pay-
         ments involving more than $20,000 over the term of the Contract
         and (m) Contracts with or for the benefit of any affiliate of
         PCI or MEDIQ or immediate family member thereof (other than


                                       -26-<PAGE>







         subsidiaries of PCI).  All such Contracts are valid and binding
         obligations of PCI and, to the knowledge of PCI, the valid and
         binding obligation of each other party thereto except such Con-
         tracts which if not so valid and binding would not, individu-
         ally or in the aggregate, have a material adverse effect on
         PCI.  Neither PCI nor, to the knowledge of PCI, any other party
         thereto is in violation of or in default in respect of, nor has
         there occurred an event or condition which with the passage of
         time or giving of notice (or both) would constitute a default
         under, any such Contract except such violations or defaults
         under such Contracts which, individually or in the aggregate,
         would not have a material adverse effect on PCI.

                   4.18  Accounts Receivable.  All accounts and notes
         receivable (including lease and finance notes receivable) and
         accrued interest receivable of PCI have arisen in the ordinary
         course of business and the accounts receivable reserves re-
         flected on the balance sheet as of March 31, 1996 included in
         the PCI SEC Documents are as of such date established in ac-
         cordance with generally accepted accounting principles con-
         sistently applied and to the best knowledge of PCI will be col-
         lectible, in the aggregate, in an amount not less than the
         amounts thereof carried on the balance sheet as of such date
         included in the PCI SEC Documents, net of any reserves included
         thereon, as applicable, except for any uncollectable amount
         which, individually or in the aggregate, would not have a mate-
         rial adverse effect on PCI.  

                   4.19  Labor Matters.  Except as set forth in Section
         4.17 to the PCI Disclosure Schedule, neither PCI nor any of its
         subsidiaries has any labor contracts, collective bargaining
         agreements or employment or consulting agreements with any per-
         sons employed by PCI or any persons otherwise performing ser-
         vices primarily for PCI or any of its subsidiaries (the "PCI
         Business Personnel").  Except as set forth in Section 4.19 to
         the PCI Disclosure Schedule, neither PCI nor any of its subsid-
         iaries has engaged in any unfair labor practice with respect to
         PCI Business Personnel, and there is no unfair labor practice
         complaint pending or, to the knowledge of PCI, threatened,
         against PCI or any of its subsidiaries with respect to PCI
         Business Personnel.  Except as set forth in Section 4.19 to the
         PCI Disclosure Schedule, there is no labor strike, dispute,
         slowdown or stoppage pending or, to the knowledge of PCI,
         threatened against PCI or any of its subsidiaries, and neither
         PCI nor any of its subsidiaries has experienced any labor
         strike, dispute, slowdown or stoppage or other labor difficulty
         involving its employees since December 31, 1991.

                   4.20  Undisclosed Liabilities.  Except (i) as and to
         the extent disclosed or reserved against on the balance sheet


                                       -27-<PAGE>







         of PCI as of March 31, 1996 included in the PCI SEC Documents,
         (ii) as incurred after the date thereof in the ordinary course
         of business consistent with prior practice and not prohibited
         by this Agreement or (iii) as set forth in Section 4.20 to the
         PCI Disclosure Schedule, PCI does not have any liabilities or
         obligations of any nature, absolute, accrued, contingent or
         otherwise and whether due or to become due, that, individually
         or in the aggregate, have or would have a material adverse ef-
         fect on PCI.  

                   4.21  Operation of PCI's Business; Relationships.
         (a)  Since March 31, 1996 through the date of this Agreement,
         PCI has not engaged in any transaction which, if done after
         execution of this Agreement, would violate Section 5.3(c)
         hereof except as set forth in Section 4.21(a) to the PCI Dis-
         closure Schedule.  

                   (b)  The relationships of PCI with its customers and
         suppliers are satisfactory and the execution of this Agreement,
         the Merger and the transactions contemplated hereby to be un-
         dertaken by PCI will not have a material adverse effect on the
         relationships of PCI with such customers or suppliers, the ef-
         fect of which, individually or in the aggregate, would have a
         material adverse effect on PCI.  

                   (c)  Except as set forth in Section 4.21(c) to the
         PCI Disclosure Schedule, to the knowledge of PCI, (i) no prod-
         uct produced or packaged by PCI has been recalled voluntarily
         or involuntarily since December 31, 1991, (ii) no such recall
         is being considered by PCI, and (iii) no such recall is being
         considered by or has been requested or ordered by any PCI cus-
         tomer, Governmental Authority or consumer group.  

                   4.22  Permits; Compliance.  PCI is in possession of
         all franchises, grants, authorizations, licenses, permits,
         easements, variances, exemptions, consents, certificates, ap-
         provals and orders necessary to own, lease and operate its
         properties and to carry on its business as it is now being con-
         ducted (collectively, the "PCI Permits"), and there is no Ac-
         tion pending or, to the knowledge of PCI, threatened regarding
         suspension or cancellation of any of the PCI Permits.  PCI is
         not in conflict with, or in default or violation of, any of the
         PCI Permits, except for any such conflicts, defaults or vio-
         lations which, individually or in the aggregate, would not rea-
         sonably be expected to have a material adverse effect on PCI.
         During the period commencing on December 31, 1991 and ending on
         the date hereof, PCI has not received any notification with





                                       -28-<PAGE>







         respect to possible conflicts, defaults or violations of Ap-
         plicable Laws, except for notices relating to possible con-
         flicts, defaults or violations, which conflicts, defaults or
         violations would not have a material adverse effect on PCI.

                   4.23  Product Warranties and Liabilities.  Except as
         listed in Section 4.23 to the PCI Disclosure Schedule, PCI has
         no forms of warranties or guarantees of its products and ser-
         vices that are in effect or proposed to be used by it.  Section
         4.23 to the PCI Disclosure Schedule sets forth a description of
         each pending or, to the knowledge of PCI, threatened Action un-
         der any warranty or guaranty against PCI.  PCI has not in-
         curred, nor does PCI know or have any reason to believe there
         is any basis for alleging, any material liability, damage,
         loss, cost or expense as a result of any material defect or
         other deficiency (whether of design, materials, workmanship,
         labeling instructions or otherwise) ("Product Liability") with
         respect to any product sold or services rendered by or on be-
         half of PCI (including any lessee thereof) prior to the Effec-
         tive Time, whether such Product Liability is incurred by reason
         of any express or implied warranty (including, without limita-
         tion, any warranty of merchantability or fitness), any doctrine
         of common law (tort, contract or other), any statutory provi-
         sion or otherwise and irrespective of whether such Product Li-
         ability is covered by insurance.

                   4.24  Environmental Matters.

                   (a)  As used herein, the term "Environmental Laws"
         means all federal, state, local or foreign laws relating to
         pollution or protection of human health or the environment (in-
         cluding, without limitation, ambient air, surface water,
         groundwater, land surface or subsurface strata), including,
         without limitation, laws relating to emissions, discharges,
         releases or threatened releases of chemicals, pollutants, con-
         taminants, or toxic or hazardous substances or wastes (col-
         lectively, "Hazardous Materials") into the environment, or oth-
         erwise relating to the manufacture, processing, distribution,
         use, treatment, storage, disposal, transport or handling of
         Hazardous Materials, as well as all authorizations, codes, de-
         crees, demands or demand letters, injunctions, judgments, li-
         censes, notices or notice letters, orders, permits, plans or
         regulations issued, entered, promulgated or approved thereun-
         der.

                   (b)  Except as set forth in Section 4.24(b) to the
         PCI Disclosure Schedule, there are, with respect to PCI, its
         subsidiaries or any predecessor of the foregoing, no past or




                                       -29-<PAGE>







         present violations of Environmental Laws, releases of any ma-
         terial into the environment, actions, activities, circum-
         stances, conditions, events, incidents, or contractual obliga-
         tions which may give rise to any common law environmental li-
         ability or any liability under the Comprehensive Environmental
         Response, Compensation and Liability Act of 1980 or similar
         federal, state, local or foreign laws and none of PCI and its
         subsidiaries has received any notice with respect to any of the
         foregoing, nor is any Action pending or threatened in connec-
         tion with any of the foregoing.

                   (c)  Other than those that are or were stored, used
         or disposed of in compliance with Applicable Law, no Hazardous
         Materials are contained on or about any real property currently
         owned, leased or used by PCI or any of its subsidiaries and no
         Hazardous Materials were released on or about any real property
         previously owned, leased or used by PCI during the period the
         property was owned, leased or used by PCI, except in the normal
         course of PCI's business.

                   (d)  Except as set forth in Section 4.24(d) to the
         PCI Disclosure Schedule, there are no underground storage tanks
         on or under any real property owned, leased or used by PCI or
         any of its subsidiaries that are not in compliance with Ap-
         plicable Law.  

                   4.25  Opinion of Financial Advisor.  PCI has received
         the written opinion of Lehman, its financial advisor, to the
         effect that, as of July 23, 1996, the Exchange Ratio is fair to
         the PCI Stockholders from a financial point of view, PCI has
         heretofore provided a copy of such opinion to Cardinal and such
         opinion has not been withdrawn, revoked or modified.

                   4.26  Board Recommendation.  The Board of Directors
         of PCI, at a meeting duly called and held, has by unanimous
         vote of those directors present (who constituted 100% of the
         directors then in office) (i) determined that this Agreement
         and the transactions contemplated hereby, including the Merger,
         and the transactions contemplated thereby, are fair to and in
         the best interests of the stockholders of PCI, and (ii)
         resolved to recommend that the holders of the shares of PCI
         Common Stock approve this Agreement and the transactions
         contemplated herein, including the Merger.

                   4.27  DGCL Section 203 and State Takeover Laws.
         Prior to the time this Agreement was executed, the Board of
         Directors of PCI has taken all action necessary to exempt under
         or make not subject to (x) Section 203 of the DGCL and (y) any
         other state takeover law or state law that purports to limit or
         restrict business combinations or the ability to acquire or


                                       -30-<PAGE>







         vote shares:  (i) the execution of this Agreement, the Support/
         Voting Agreements dated as of July 23, 1996 between Cardinal
         and certain PCI Stockholders (collectively, the "Support
         Agreements") and the Stock Option Agreement dated July 23, 1996
         between Cardinal and MEDIQ (the "MEDIQ Option Agreement"), (ii)
         the Merger and (iii) the transactions contemplated hereby and
         by the MEDIQ Option Agreement and the Support Agreements.

                   4.28  Employment Agreements.  Each of the employment
         agreements between PCI and Messrs. Daniel Gerner and Richard
         Sauter dated the date hereof (i) has been duly executed and
         delivered by the respective employee and (ii) as of the Effec-
         tive Time, shall not have been terminated since the date here-
         of.

                   4.29  Insurance.  Except as set forth in Section 4.29
         to the PCI Disclosure Schedule, PCI is presently insured, and
         during each of the past five calendar years has been insured
         against such risks as companies engaged in a similar business
         would, in accordance with good business practice, customarily
         be insured.  Except as set forth in Section 4.29 to the PCI
         Disclosure Schedule, the policies of fire, theft, liability and
         other insurance maintained with respect to the assets or busi-
         nesses of the Company and its subsidiaries provide adequate
         coverage against loss and may be continued by PCI without modi-
         fication or premium increase after the Effective Time and for
         the duration of their current terms which terms expire as set
         forth in Section 4.29 to the PCI Disclosure Schedule. 

                   4.30  Affiliate Transactions.  Except as set forth in
         Section 4.17 to the PCI Disclosure Schedule or as contemplated
         by the transactions contemplated hereby, there are no Contracts
         or other transactions between PCI, on the one hand, and any (i)
         officer or director of PCI, (ii) record or beneficial owner of
         five percent or more of the voting securities of PCI or (iii)
         affiliate (as such term is defined in Regulation 12b-2 promul-
         gated under the Exchange Act) of any such officer, director or
         beneficial owner, on the other hand.



                                    ARTICLE V

                             COVENANTS OF THE PARTIES

                   The parties hereto agree as follows with respect to
         the period from and after the execution of this Agreement.





                                       -31-<PAGE>







                   5.1  Mutual Covenants.

                   (a)  General.  Each of the parties shall use its rea-
         sonable efforts to take all action and to do all things neces-
         sary, proper or advisable to consummate the Merger and the
         transactions contemplated by this Agreement (including, without
         limitation, using its reasonable efforts to cause the condi-
         tions set forth in Article VI for which they are responsible to
         be satisfied as soon as reasonably practicable and to prepare,
         execute and deliver such further instruments and take or cause
         to be taken such other and further action as any other party
         hereto shall reasonably request).

                   (b)  HSR Act.  As soon as practicable, and in any
         event no later than ten (10) business days after the date here-
         of, each of the parties hereto will file any Notification and
         Report Forms and related material required to be filed by it
         with the Federal Trade Commission and the Antitrust Division of
         the United States Department of Justice under the HSR Act with
         respect to the Merger, will use its reasonable efforts to ob-
         tain an early termination of the applicable waiting period, and
         shall promptly make any further filings pursuant thereto that
         may be necessary, proper or advisable; provided, however, that
         neither Cardinal nor any of its subsidiaries shall be required
         hereunder to divest or hold separate any portion of their busi-
         ness or assets.  

                   (c)  Other Governmental Matters.  Each of the parties
         shall use its reasonable efforts to take any additional action
         that may be necessary, proper or advisable in connection with
         any other notices to, filings with, and authorizations, con-
         sents and approvals of any Governmental Authority that it may
         be required to give, make or obtain.

                   (d)  Pooling-of-Interests.  Each of the parties shall
         use its best efforts to cause the Merger to qualify for
         pooling-of-interests accounting treatment for financial report-
         ing purposes. 

                   (e)  Public Announcements.  Unless otherwise required
         by Applicable Laws or requirements of the National Association
         of Securities Dealers, the American Stock Exchange or the NYSE
         (and in that event only if time does not permit), at all times
         prior to the earlier of the Effective Time or termination of
         this Agreement pursuant to Section 7.1, Cardinal, MEDIQ and PCI
         shall consult with each other before issuing any press release
         with respect to the Merger and shall not issue any such press
         release prior to such consultation.




                                       -32-<PAGE>







                   (f)  Intercompany Agreements.  Unless otherwise
         specified by Cardinal prior to the Effective Time, as of the
         Effective Time all Contracts, agreements, arrangements or
         understandings between MEDIQ and PCI (other than this Agreement
         and those in Section 5.1(f) to the PCI Disclosure Schedule)
         shall be terminated without any liability to PCI.  

                   5.2  Covenants of Cardinal.

                   (a)  Preparation of Registration Statement.  Cardinal
         shall, as soon as is reasonably practicable, prepare and file
         the Proxy Statement with the Commission on a confidential ba-
         sis.  Cardinal shall prepare and file the Registration State-
         ment with the Commission as soon as is reasonably practicable
         following clearance of the Proxy Statement by the Commission
         and shall use all reasonable efforts to have the Registration
         Statement declared effective by the Commission as promptly as
         practicable and to maintain the effectiveness of the Registra-
         tion Statement through the Effective Time, including, to the
         extent Cardinal becomes aware of any information contained or
         omitted from the Registration Statement which makes any
         material statement contained therein false or misleading,
         filing the information necessary to make such statements in the
         Registration Statement not false or misleading.  Cardinal shall
         use all reasonable efforts to cause the Registration Statement
         to register under the Securities Act all of the Cardinal Common
         Shares to be issued in the Merger to the PCI Stockholders
         (including MEDIQ).  Cardinal also shall take such other
         reasonable actions (other than qualifying to do business in any
         jurisdiction in which it is not so qualified) required to be
         taken under any applicable state securities laws in connection
         with the issuance of Cardinal Common Shares in the Merger.  

                   (b)  Indemnification.  From and after the Effective
         Time, Cardinal shall cause the Surviving Corporation
         (including, to the extent required, providing sufficient
         funding) to indemnify and hold harmless and advance expenses
         for the present and former officers and directors of PCI in
         respect of acts or omissions occurring prior to the Effective
         Time to the extent provided under the PCI Certificate of In-
         corporation, as amended and restated, and Bylaws, in each case
         as in effect on the date hereof.

                   (c)  Notification of Certain Matters.  Cardinal shall
         give prompt notice to PCI of (i) the occurrence or non-
         occurrence of any event the occurrence or non-occurrence of
         which would cause any Cardinal or Subcorp representation or
         warranty contained in this Agreement to be untrue or inaccurate
         at or prior to the Effective Time and (ii) any material failure
         of Cardinal to comply with or satisfy any covenant, condition


                                       -33-<PAGE>







         or agreement to be complied with or satisfied by it hereunder;
         provided, however, that the delivery of any notice pursuant to
         this Section 5.2(c) shall not limit or otherwise affect the
         remedies available hereunder to PCI.

                   (d)  Pooling Press Release.  If the Effective Time
         occurs after December 1, 1996, then Cardinal shall use its best
         efforts to prepare and publicly release as soon as practicable
         following the end of the first full calendar month following
         the Effective Time a report in the form of a quarterly earnings
         report, registration statement filed with the Commission, a
         report filed with the Commission on Form 10-K, 10-Q or 8-K or
         any other public filing, statement or announcement which in-
         cludes the combined financial results (including combined sales
         and net income) of Cardinal and PCI for a period of at least 30
         days of combined operations of Cardinal and PCI following the
         Effective Time.

                   5.3  Covenants of PCI and MEDIQ.

                   (a)  PCI Stockholders Meeting.  PCI shall take all
         action in accordance with the federal securities laws, the DGCL
         and its Certificate of Incorporation, as amended and restated,
         and Bylaws necessary to obtain the consent and approval of PCI
         Stockholders with respect to the Merger, this Agreement and the
         transactions contemplated hereby on the earliest practicable
         date.

                   (b)  Information for the Registration Statement and
         Preparation of Proxy Statement.  PCI and MEDIQ shall each
         promptly furnish Cardinal with all information concerning it as
         may be required for inclusion in the Registration Statement.
         PCI and MEDIQ shall cooperate with Cardinal in the preparation
         of the Registration Statement in a timely fashion and shall use
         all reasonable efforts to assist Cardinal in having the
         Registration Statement declared effective by the Commission as
         promptly as practicable.  If at any time prior to the Effective
         Time, any information pertaining to PCI or MEDIQ, as the case
         may be, contained in or omitted from the Registration Statement
         makes such statements contained in the Registration Statement
         false or misleading, PCI or MEDIQ, as the case may be, shall
         promptly so inform Cardinal and provide Cardinal with the
         information necessary to make statements contained therein not
         false and misleading.  PCI and MEDIQ shall use all reasonable
         efforts to cooperate with Cardinal in the preparation and
         filing of the Proxy Statement with the Commission on a
         confidential basis and PCI shall be responsible for paying the
         required filing fee under the Exchange Act in connection with
         the initial filing of the Proxy Statement with the Commission.
         PCI shall use all reasonable efforts to mail at the earliest


                                       -34-<PAGE>







         practicable date to PCI Stockholders the Proxy Statement, which
         shall include all information required under Applicable Law to
         be furnished to PCI Stockholders in connection with the Merger
         and the transactions contemplated thereby and shall include the
         recommendation of PCI's Board of Directors in favor of the
         Merger.

                   (c)  Conduct of PCI's Operations.  During the period
         from the date of this Agreement to the Effective Time, PCI
         shall conduct its operations in the ordinary course except as
         expressly contemplated by this Agreement and the transactions
         contemplated hereby and shall use its reasonable efforts to
         maintain and preserve its business organization and its mate-
         rial rights and franchises and to retain the services of its
         officers and key employees and maintain relationships with cus-
         tomers, suppliers, lessees, licensees and other third parties
         to the end that their goodwill and ongoing business shall not
         be impaired in any material respect.  Without limiting the gen-
         erality of the foregoing, during the period from the date of
         this Agreement to the Effective Time, PCI shall not, except as
         otherwise expressly contemplated by this Agreement and the
         transactions contemplated hereby or as set forth in Section
         5.3(c) to the PCI Disclosure Schedule, without the prior writ-
         ten consent of Cardinal:

                   (i)  do or effect any of the following actions with
              respect to its securities:  (A) adjust, split, combine or
              reclassify its capital stock, (B) make, declare or pay any
              dividend or distribution on, or directly or indirectly
              redeem, purchase or otherwise acquire, any shares of its
              capital stock or any securities or obligations convertible
              into or exchangeable for any shares of its capital stock,
              (C) grant any person any right or option to acquire any
              shares of its capital stock, (D) issue, deliver or sell or
              agree to issue, deliver or sell any additional shares of
              its capital stock or any securities or obligations con-
              vertible into or exchangeable or exercisable for any
              shares of its capital stock or such securities (except (i)
              the issuance of shares of PCI Common Stock held in PCI's
              treasury pursuant to the exercise of outstanding options
              to purchase PCI Common Stock or (ii) to sell shares of PCI
              Common Stock held in PCI's treasury in order for PCI to
              satisfy its obligations pursuant to Section 5.1(d)), or
              (E) enter into any agreement, understanding or arrangement
              with respect to the sale or voting of its capital stock;

                  (ii)  sell, transfer, lease, pledge, mortgage, encum-
              ber or otherwise dispose of any of its property or assets
              other than sales or leases of inventory or licensing of



                                       -35-<PAGE>







              Intellectual Property made in the ordinary course of busi-
              ness;

                 (iii)  make or propose any changes in its Certificate
              of Incorporation or Bylaws;

                  (iv)  merge or consolidate with any other person or
              acquire a material amount of assets or capital stock of
              any other person or, except to the extent permitted under
              Section 5.3(e), enter into any confidentiality agreement
              with any person other than in the ordinary course of busi-
              ness;

                   (v)  incur, create, assume or otherwise become liable
              for indebtedness for borrowed money, or assume, guarantee,
              endorse or otherwise as an accommodation become respon-
              sible or liable for obligations of any other individual,
              corporation or other entity, in excess of $100,000, in
              each instance, or in excess of $250,000, in the aggregate,
              other than pursuant to existing working capital credit
              lines and facilities the aggregate amount available under
              which has not been increased following the date hereof;

                  (vi)  create any subsidiaries;

                 (vii)  enter into or modify any employment, severance,
              termination or similar agreements or arrangements with, or
              grant any bonuses, salary increases, severance or termina-
              tion pay to, any officer, director, consultant or employee
              other than salary increases granted in the ordinary course
              of business consistent with past practice to employees who
              are not officers or directors of PCI, or otherwise in-
              crease the compensation or benefits provided to any of-
              ficer, director, consultant or employee except as may be
              required by Applicable Law or a binding written contract
              in effect on the date of this Agreement, and, in the case
              of consultants and employees, other than in the ordinary
              course of business consistent with past practice;

                (viii)  (A) change its method of doing business other
              than in any immaterial respect or (B) change any method or
              principle of accounting in a manner that is inconsistent
              with past practice;

                  (ix)  settle any Actions, whether now pending or here-
              after made or brought involving an amount in excess of
              $50,000;

                   (x)  modify, amend or terminate, or waive, release or
              assign any material rights or claims with respect to, any


                                       -36-<PAGE>







              Contract set forth in Section 4.17 to the PCI Disclosure
              Schedule, any other material Contract to which PCI is a
              party or, except to the extent required by Applicable Law
              as advised by outside counsel, any confidentiality agree-
              ment to which PCI is a party;

                  (xi)  incur or commit to any capital expenditures,
              obligations or liabilities in respect thereof which exceed
              or would exceed $100,000, individually or $1,000,000, in
              the aggregate (provided that in no event shall approval be
              required for any individual expenditure not in excess of
              $25,000);

                 (xii)  make any material changes or modifications to
              any pricing policy (related discounts or fees) or invest-
              ment policy or enter into any new leases on terms differ-
              ent from those in effect in the ordinary and usual course
              of business, consistent with past practice;

                (xiii)  pay (or agree to become obligated to pay) any
              Merger Fees in excess of the amount set forth in Section
              4.14 to the PCI Disclosure Schedule;

                 (xiv)  take any action to exempt or make not subject to
              (x) Section 203 of the DGCL or (y) any other state take-
              over law or state law that purports to limit or restrict
              business combinations or the ability to acquire or vote
              shares, any person or entity (other than Cardinal or its
              subsidiaries) or any action taken thereby, which person,
              entity or action would have otherwise been subject to the
              restrictive provisions thereof and not exempt therefrom;

                  (xv)  take any action that would result in the repre-
              sentations and warranties set forth in Article IV becoming
              false or inaccurate;

                 (xvi)  enter into or carry out any other transaction
              other than in the ordinary and usual course of business; 

                (xvii)  permit or cause any subsidiary to do any of the
              foregoing or agree or commit to do any of the foregoing;
              or

               (xviii)  agree in writing or otherwise to take any of the
              foregoing actions.

                   (d)  Intellectual Property Matters.  PCI shall use
         its best efforts to preserve its ownership rights to the Intel-
         lectual Property free and clear of any liens, claims or encum-
         brances and shall use its best efforts to assert, contest and


                                       -37-<PAGE>







         prosecute any infringement of any issued foreign or domestic
         patent, trademark, service mark, tradename or copyright that
         forms a part of the Intellectual Property or any misappropria-
         tion or disclosure of any trade secret, confidential informa-
         tion or know-how that forms a part of the Intellectual Prop-
         erty.

                   (e)  No Solicitation.  Each of PCI and MEDIQ, sever-
         ally and not jointly, agrees that, during the term of this
         Agreement, it shall not, and shall not authorize or permit any
         of its subsidiaries or any of its or its subsidiaries' direc-
         tors, officers, employees, agents or representatives, directly
         or indirectly, to solicit, initiate, encourage or facilitate,
         or furnish or disclose non-public information in furtherance
         of, any inquiries or the making of any proposal with respect to
         any recapitalization, merger, consolidation or other business
         combination involving PCI, or acquisition of any capital stock
         (other than upon exercise of outstanding PCI Options) or any
         material portion of the assets (except for acquisition of as-
         sets in the ordinary course of business consistent with past
         practice) of PCI, or any combination of the foregoing (a "-
         Competing Transaction"), or negotiate, explore or otherwise en-
         gage in discussions with any person (other than Cardinal,
         Subcorp or their respective directors, officers, employees,
         agents and representatives) with respect to any Competing
         Transaction or enter into any agreement, arrangement or un-
         derstanding requiring it to abandon, terminate or fail to
         consummate the Merger or any other transactions contemplated by
         this Agreement; provided that PCI may furnish information to,
         and negotiate or otherwise engage in discussions with, any
         party who delivers a written proposal for a Competing Trans-
         action if and so long as the Board or Directors of PCI deter-
         mines in good faith by a majority vote, based upon the advice
         of its outside legal counsel, that failing to take such action
         would constitute a breach of the fiduciary duties of the Board
         (and so advises Cardinal) and such a proposal is, based upon
         written advice of Lehman (or any other nationally recognized
         investment banking firm), more favorable to PCI's Stockholders
         in the aggregate and from a financial point of view than the
         transactions contemplated by this Agreement (including any
         adjustment to the terms and conditions of such transactions
         proposed by Cardinal in response to such Competing
         Transaction), and in such case the Board of Directors of PCI
         may withdraw its recommendation of this Agreement or the Merger
         (provided that the foregoing shall in no way limit or otherwise
         affect Cardinal's right to terminate this Agreement pursuant to
         Section 7.1(e)).  PCI will immediately cease all existing ac-
         tivities, discussions and negotiations with any parties con-
         ducted heretofore with respect to any of the foregoing.  From
         and after the execution of this Agreement, each of PCI and


                                       -38-<PAGE>







         MEDIQ shall immediately advise Cardinal in writing of the re-
         ceipt, directly or indirectly, of any inquiries, discussions,
         negotiations, or proposals relating to a Competing Transaction
         (including the specific terms thereof) and promptly furnish to
         Cardinal a copy of any such proposal or inquiry in addition to
         any information provided to or by any third party relating
         thereto.

                   (f)  Affiliates of PCI.  PCI shall cause each such
         person who may be at the Effective Time or was on the date
         hereof an "affiliate" of PCI for purposes of Rule 145 under the
         Securities Act, to execute and deliver to Cardinal no less than
         45 days prior to the date of the meeting of PCI Stockholders to
         approve the Merger, the written undertakings in the form at-
         tached hereto as Exhibit A.  On or prior to such date, outside
         counsel for PCI shall provide Cardinal with a letter
         (reasonably satisfactory to counsel to Cardinal) specifying all
         of the persons or entities who, in such counsel's view, may be
         deemed to be "affiliates" of PCI under the preceding sentence.

                   (g)  Access.  From and after the date of this Agree-
         ment until the Effective Time (or the termination of this
         Agreement), PCI shall permit representatives of Cardinal to
         have appropriate access at all reasonable times to PCI's pre-
         mises, properties, books, records, contracts, tax records, doc-
         uments, customers and suppliers.  Information obtained by
         Cardinal pursuant to this Section 5.1(g) shall be subject to
         the provisions of the confidentiality agreement between
         Cardinal and Lehman dated June 19, 1996 (the "Confidentiality
         Agreement"), which agreement remains in full force and effect.
         Without limiting the generality of the foregoing, Cardinal
         shall be provided the opportunity to have its representatives
         participate in all meetings and, to the extent practicable,
         phone conversations with representatives of the Internal
         Revenue Service ("IRS") relating to the Qualified Plans and to
         review and comment upon any written materials submitted to the
         IRS relating to the Qualified Plans before such submission is
         made.  

                   (h)  Notification of Certain Matters by PCI.  PCI
         shall give prompt notice to Cardinal of (i) the occurrence or
         non-occurrence of any event the occurrence or non-occurrence of
         which would cause any PCI representation or warranty contained
         in this Agreement to be untrue or inaccurate at or prior to the
         Effective Time and (ii) any material failure of PCI to comply
         with or satisfy any covenant, condition or agreement to be com-
         plied with or satisfied by it hereunder; provided, however,
         that the delivery of any notice pursuant to this Section 5.3(h)
         shall not limit or otherwise affect the remedies available
         hereunder to Cardinal.


                                       -39-<PAGE>







                   (i)  Notification of Certain Matters by MEDIQ.  MEDIQ
         shall give prompt notice to Cardinal and PCI of (i) the
         occurrence or non-occurrence of any event the occurrence or
         non-occurrence of which would cause any MEDIQ representation or
         warranty contained in this Agreement to be untrue or inaccurate
         at or prior to the Effective Time and (ii) any material failure
         of MEDIQ to comply with or satisfy any covenant, condition or
         agreement to be complied with or satisfied by it hereunder;
         provided, however, that the delivery of any notice pursuant to
         this Section 5.3(i) shall not limit or otherwise affect the
         remedies available hereunder to Cardinal.



                                    ARTICLE VI

                                    CONDITIONS

                   6.1  Mutual Conditions.  The obligations of the par-
         ties hereto to consummate the Merger shall be subject to ful-
         fillment of the following conditions:

                   (a)  No temporary restraining order, preliminary or
              permanent injunction or other order or decree which pre-
              vents the consummation of the Merger shall have been is-
              sued and remain in effect, and no statute, rule or regu-
              lation shall have been enacted by any Governmental Author-
              ity which prevents the consummation of the Merger.

                   (b)  All waiting periods applicable to the consumma-
              tion of the Merger under the HSR Act shall have expired or
              been terminated.

                   (c)  The Merger and the transactions contemplated
              hereby shall have been approved by the PCI Stockholders in
              the manner required by any Applicable Law.

                   (d)  The Commission shall have declared the Reg-
              istration Statement effective.  On the Closing Date and at
              the Effective Time, no stop order or similar restraining
              order shall have been threatened by the Commission or en-
              tered by the Commission or any state securities admin-
              istrator prohibiting the Merger.

                   (e)  No Action shall be instituted by any Governmen-
              tal Authority which seeks to prevent consummation of the
              Merger or seeking material damages in connection with the
              transactions contemplated hereby which continues to be
              outstanding.



                                       -40-<PAGE>







                   6.2 Conditions to Obligations of PCI.  The obliga-
         tions of PCI to consummate the Merger and the transactions con-
         templated hereby shall be subject to the fulfillment of the
         following conditions unless waived by PCI:

                   (a)  The representations and warranties of each of
              Cardinal and Subcorp set forth in Article III shall be
              true and correct on the date hereof and on and as of the
              Closing Date as though made on and as of the Closing Date
              (except for representations and warranties made as of a
              specified date, which need be true and correct only as of
              the specified date), except for such inaccuracies which
              have not had and would not reasonably be expected to have
              in the reasonably foreseeable future a material adverse
              effect on Cardinal.  

                   (b)  Each of Cardinal and Subcorp shall have per-
              formed in all material respects each obligation and agree-
              ment and shall have complied in all material respects with
              each covenant to be performed and complied with by it
              hereunder at or prior to the Effective Time.

                   (c)  Each of Cardinal and Subcorp shall have fur-
              nished PCI with a certificate dated the Closing Date
              signed on behalf of it by the Chairman, President or any
              Vice President to the effect that the conditions set forth
              in Sections 6.2(a) and (b) have been satisfied.

                   (d)  PCI shall have received the legal opinion, dated
              the Closing Date, of Wachtell, Lipton, Rosen & Katz, spe-
              cial counsel to Cardinal, in substantially the form at-
              tached hereto as Exhibit B.

                   (e)  The Cardinal Common Shares to be issued in the
              Merger and upon exercise of the Cardinal Exchange Options
              and the transactions contemplated hereby shall have been
              authorized for inclusion on the NYSE, subject to official
              notice of issuance.

                   6.3 Conditions to Obligations of Cardinal and Sub-
         corp.  The obligations of Cardinal to consummate the Merger and
         the other transactions contemplated hereby shall be subject to
         the fulfillment of the following conditions unless waived by
         each of Cardinal and Subcorp:

                   (a)  The representations and warranties of PCI set
              forth in Article IV shall be true and correct on the date
              hereof and on and as of the Closing Date as though made on
              and as of the Closing Date (except for representations and
              warranties made as of a specified date, which need be true


                                       -41-<PAGE>







              and correct only as of the specified date), except for
              such inaccuracies which have not had and would not reason-
              ably be expected to have in the reasonably foreseeable
              future a material adverse effect on PCI.  The possible
              liabilities with respect to the compliance issues
              described in Schedule 4.16(c) A, B and C have not had and
              would not reasonably be expected to have in the reasonably
              foreseeable future a material adverse effect on PCI.  The
              representations and warranties of MEDIQ set forth in
              Section 8.1 shall be true and correct on the date hereof
              and on and as of the Closing Date (except for any
              representations and warranties made as of a specific date
              which need be true and correct only as of the specified
              date), except for such inaccuracies which have not had and
              would not reasonably be expected to have in the reasonably
              foreseeable future a material adverse effect on the
              ability of MEDIQ to consummate the transactions
              contemplated hereby.

                   (b)  PCI shall have performed in all material re-
              spects each obligation and agreement and shall have com-
              plied in all material respects with each covenant to be
              performed and complied with by it hereunder at or prior to
              the Effective Time.

                   (c)  PCI shall have furnished Cardinal with a cer-
              tificate dated the Closing Date signed on its behalf by
              its Chairman, President or any Vice President to the ef-
              fect that the conditions set forth in Sections 6.3(a) and
              (b) have been satisfied.

                   (d)  Cardinal shall have received the legal opinion,
              dated the Closing Date, of Ballard Spahr Andrews &
              Ingersoll, substantially in the form attached hereto as
              Exhibit C.

                   (e)  Cardinal shall have received a letter, in form
              and substance reasonably satisfactory to Cardinal, from
              Deloitte & Touche L.L.P. dated the date of the Proxy
              Statement and confirmed in writing at the Effective Time
              stating that the Merger will qualify as a pooling of in-
              terests transaction under Opinion 16 of the Accounting
              Principles Board.

                   (f)  Each person who may be at the Effective Time or
              was on the date of this Agreement an "affiliate" of PCI
              for purposes of Rule 145 under the Securities Act, shall
              have executed and delivered to Cardinal at least 45 days
              prior to the date of the meeting of PCI Stockholders to



                                       -42-<PAGE>







              approve the Merger the written undertakings in the form
              attached hereto as Exhibit A. 

                   (g)  There shall not have been a breach of (i) any
              obligation by any stockholder which has entered into a
              Support Agreement and (ii) the MEDIQ Option Agreement.

                   (h)  Since the date of this Agreement, except to the
              extent contemplated by Section 4.6 to the PCI Disclosure
              Schedule, there shall not have been any material adverse
              change in the assets, liabilities, prospects, results of
              operations, business or financial condition of PCI and its
              subsidiaries taken as a whole or any material adverse ef-
              fect on the ability of PCI to consummate the transactions
              contemplated hereby.

                   (i)  The two employment agreements referenced in Sec-
              tion 4.28 hereof shall not have been breached or termi-
              nated and shall be in effect.



                                   ARTICLE VII

                            TERMINATION AND AMENDMENT

                   7.1 Termination.  This Agreement may be terminated at
         any time prior to the Effective Time, whether before or after
         approval and adoption of this Agreement by PCI Stockholders:

                   (a)  by mutual consent of Cardinal and PCI;

                   (b)  by either Cardinal or PCI if any permanent
              injunction or other order of a court or other competent
              Governmental Authority preventing the consummation of the
              Merger shall have become final and nonappealable;

                   (c)  by either Cardinal or PCI if the Merger shall
              not have been consummated before January 31, 1997, unless
              extended by the Boards of Directors of both Cardinal and
              PCI (provided that the right to terminate this Agreement
              under this Section 7.1(c) shall not be available to any
              party whose failure or whose affiliate's failure to per-
              form any material covenant or obligation under this Agree-
              ment has been the cause of or resulted in the failure of
              the Merger to occur on or before such date);

                   (d)  (i) by PCI, no earlier than the fifth trading
              day nor later than the third full trading day immediately
              preceding the meeting of PCI Stockholders at which the


                                       -43-<PAGE>







              vote to approve the Merger occurs (the "7.1(d) Termination
              Period") if the Average Share Price is less than $58.12,
              provided that PCI will have no right to terminate pursuant
              to this clause (i) unless (x) PCI shall have given, during
              the 7.1(d) Termination Period, one full trading day's
              prior written notice of its intention to terminate pursu-
              ant to this Section 7.1(d) and (y) Cardinal during such
              one full trading day notice period shall not have given
              written notice (an "Adjustment Election") to PCI that the
              Exchange Ratio shall be calculated pursuant to clause (ii)
              of Section 2.2, (ii) by Cardinal during the 7.1(d)
              Termination Period if the Average Share Price is less than
              $56.41,or (iii) by either PCI or Cardinal during the
              7.1(d) Termination Period if the Average Share Price is
              less than $54.70;

                   (e)  by Cardinal if the Board of Directors of PCI
              shall withdraw, modify or change its recommendation of
              this Agreement or the Merger in a manner adverse to
              Cardinal, or if the Board of Directors of PCI shall have
              refused to affirm its recommendation within two business
              days of any written request from Cardinal which request
              was made upon a reasonable basis;

                   (f)  by Cardinal or PCI if at the meeting of PCI
              Stockholders (including any adjournment or postponement
              thereof) the requisite vote of the PCI Stockholders to
              approve the Merger and the transactions contemplated
              hereby shall not have been obtained; 

                   (g)  [Intentionally omitted]

                   (h)  by Cardinal if MEDIQ shall have breached any of
              its representations, covenants, or obligations under the
              MEDIQ Option Agreement (other than in any immaterial
              respect);

                   (i)  by Cardinal if at any time the representations
              and warranties of PCI set forth in Section 4.15 shall not
              be true and correct; 

                   (j)  by Cardinal if Cardinal shall have been advised
              that the condition set forth in Section 6.3(e) cannot be
              satisfied; or

                   (k)  by PCI if, prior to the meeting of PCI Stock-
              holders at which the vote to approve the Merger is to oc-
              cur, the Board of Directors of PCI approves an agreement
              to effect a Competing Transaction if the PCI Board has
              determined in good faith, upon advice from its outside


                                       -44-<PAGE>







              counsel, that failure to approve such agreement and termi-
              nate this Agreement would constitute a breach of the fidu-
              ciary duties of the PCI Board (and so advised Cardinal)
              and such Competing Transaction is, based upon written
              advice of Lehman (or any other nationally recognized
              investment banking firm), more favorable to PCI's Stock-
              holders in the aggregate and from a financial point of
              view than the transactions contemplated by this Agreement
              (including any adjustment to the terms and conditions of
              such transactions proposed by Cardinal in response to such
              Competing Transaction); provided that the termination
              described in this paragraph (k) shall not be effective
              until the close of business on the second business day
              following the date on which Cardinal receives written
              notice from PCI of PCI's intent to terminate pursuant to
              this paragraph (k) and unless and until PCI shall have
              paid Cardinal all of the fees and expenses described in
              Section 7.2.

                   7.2 Effect of Termination.  In the event of the ter-
         mination of this Agreement pursuant to Section 7.1, this Agree-
         ment, except for the provisions of the last sentence of Section
         5.3(g) and the provisions of Sections 7.2, 8.11 and 8.12, shall
         become void and have no effect, without any liability on the
         part of any party or its directors, officers or stockholders.
         Notwithstanding the foregoing, nothing in this Section 7.2
         shall relieve any party to this Agreement of liability for a
         material breach of any provision of this Agreement and pro-
         vided, further, however, that if it shall be judicially deter-
         mined that termination of this Agreement was caused by an in-
         tentional breach of this Agreement, then, in addition to other
         remedies at law or equity for breach of this Agreement, the
         party so found to have intentionally breached this Agreement
         shall indemnify and hold harmless the other parties for their
         respective costs, fees and expenses of their counsel, accoun-
         tants, financial advisors and other experts and advisors as
         well as fees and expense incident to negotiation, preparation
         and execution of this Agreement and related documentation and
         shareholders' meetings and consents ("Costs").  If this Agree-
         ment is terminated for any reason pursuant to Section 7.1
         (other than a termination pursuant to Sections 7.1(a), 7.1(b),
         7.1(c) (other than a termination by Cardinal pursuant to
         Section 7.1(c) if PCI, MEDIQ or PCI's affiliates failure to
         perform any material covenant or obligation under this
         Agreement has been the cause of or resulted in the failure of
         the Merger to occur on or before January 31, 1997), 7.1(d),
         7.1(h) or 7.1(j)) PCI will, in the case of a termination by
         Cardinal, within three business days following any such
         termination or, in the case of a termination by PCI, prior to
         such termination, pay to Cardinal in cash by wire transfer in


                                       -45-<PAGE>







         immediately available funds to an account designated by
         Cardinal (i) in reimbursement for Cardinal's expenses an amount
         in cash equal to the aggregate amount of Cardinal's Costs
         incurred in connection with pursuing the transactions contem-
         plated by this Agreement, including, without limitation, legal,
         accounting and investment banking fees, up to but not in excess
         of an amount equal to $1.0 million in the aggregate and (ii) a
         termination fee in an amount equal to $5.0 million.  If this
         Agreement is terminated pursuant to Section 7.1(j), PCI will,
         in the case of a termination by Cardinal, within three business
         days following any such termination, pay to Cardinal in cash by
         wire transfer in immediately available funds to an account
         designated by Cardinal in reimbursement for Cardinal's expenses
         an amount in cash equal to the aggregate amount of Cardinal's
         Costs incurred in connection with pursuing the transactions
         contemplated by this Agreement, including, without limitation,
         legal, accounting and investment banking fees, up to but not in
         excess of an amount equal to $1.0 million in the aggregate.

                   7.3 Amendment.  This Agreement may be amended by the
         parties hereto, by action taken or authorized by their respec-
         tive Boards of Directors, at any time before or after adoption
         of this Agreement by PCI Stockholders, but after any such ap-
         proval, no amendment shall be made which by law requires fur-
         ther approval or authorization by the PCI Stockholders without
         such further approval or authorization.  Notwithstanding the
         foregoing, this Agreement may not be amended except by an in-
         strument in writing signed on behalf of each of the parties
         hereto.

                   7.4 Extension; Waiver.  At any time prior to the
         Effective Time, Cardinal (with respect to PCI and MEDIQ), PCI
         (with respect to Cardinal, Subcorp and MEDIQ) and MEDIQ (with
         respect to PCI, Cardinal and Subcorp) by action taken or au-
         thorized by their respective Boards of Directors, may, to the
         extent legally allowed, (a) extend the time for the performance
         of any of the obligations or other acts of such party, (b)
         waive any inaccuracies in the representations and warranties
         contained herein or in any document delivered pursuant hereto
         and (c) waive compliance with any of the agreements or condi-
         tions contained herein.  Any agreement on the part of a party
         hereto to any such extension or waiver shall be valid only if
         set forth in a written instrument signed on behalf of such
         party.








                                       -46-<PAGE>







                                   ARTICLE VIII

                                  MISCELLANEOUS

                   8.1  Representations and Warranties of MEDIQ.  In
         order to induce PCI, Subcorp and Cardinal to enter into this
         Agreement, MEDIQ hereby represents and warrants to PCI,
         Cardinal and Subcorp that the following statements are true,
         correct and complete:

                   (a)  MEDIQ Investment Services, Inc. is the regis-
              tered owner, and MEDIQ is the sole beneficial owner (in
              addition to the registered owner), of 2,875,000 shares of
              PCI Common Stock.

                   (b)  MEDIQ has full power and authority to execute
              and deliver this Agreement and to perform its obligations
              under this Agreement.  This Agreement is the legal, valid
              and binding obligation of MEDIQ, enforceable against MEDIQ
              in accordance with its terms.  The execution and delivery
              of this Agreement, the performance of MEDIQ's obligations
              hereunder and the consummation of the transactions contem-
              plated hereby have been duly and validly authorized by all
              necessary corporate proceedings on the part of MEDIQ, its
              Board of Directors and stockholders.  The execution, de-
              livery and performance of this Agreement and the consumma-
              tion of the transactions contemplated hereby will not
              (i) violate any provision of MEDIQ's certificate of incor-
              poration or by-laws, (ii)  violate any provision of, or be
              an event that is (or with the passage of time will result
              in) a violation of, or result in the acceleration of or
              entitle any party to accelerate (whether after the giving
              of notice or lapse of time or both) any obligation under,
              or result in the imposition of any lien upon or the cre-
              ation of a security interest in any of the shares of PCI
              Common Stock owned by MEDIQ pursuant to, any mortgage,
              lien, lease, agreement, instrument, order, arbitration
              award, judgment or decree to which MEDIQ is a party or by
              which MEDIQ is bound, or (iii) except as listed on Section
              8.1(b) to the disclosure schedule delivered by MEDIQ to
              Cardinal and dated the date hereof (the "MEDIQ Disclosure
              Schedule"), violate or conflict with any provision of law,
              order, judgment or ruling of any governmental authority or
              any other material restriction of any kind or character to
              which MEDIQ is subject, that, in the case of clause (iii)
              would, individually or in the aggregate, have a material
              adverse effect on the transactions contemplated by the
              Merger Agreement or the benefits anticipated to be real-
              ized by Cardinal as a result of the Merger. This Agreement
              has been duly executed and delivered by MEDIQ, and,


                                       -47-<PAGE>







              assuming the due execution hereof by Cardinal and PCI,
              this Agreement constitutes the legal, valid and binding
              obligation of MEDIQ, enforceable against MEDIQ in
              accordance with its terms.

                   (c)  At the Effective Time of the Merger, as contem-
              plated by this Agreement, MEDIQ will deliver to Cardinal
              good title to the shares of PCI Common Stock owned by
              MEDIQ free and clear of any liens, claims, charges,
              security interests, options or other legal or equitable
              encumbrances.

                   (d)  With respect to all of the Contracts, agree-
              ments, arrangements and understandings  between MEDIQ and
              PCI, all of which are set forth in Section 8.1(d) to the
              MEDIQ Disclosure Schedule, all of such Contracts, agree-
              ments, arrangements and understandings may be terminated
              at the Effective Time of the Merger without creating any
              liability or additional cost to PCI or Cardinal except as
              specifically set forth in Section 5.1(f) to the PCI
              Disclosure Schedule.  Except as set forth in Section 4.17
              to the PCI Disclosure Schedule and Section 8.1(d) to the
              MEDIQ Disclosure Schedule, there are no Contracts,
              arrangements, agreements or understandings between PCI and
              MEDIQ.

                   (e)  Neither MEDIQ nor any director, officer, em-
              ployee or (to the knowledge of MEDIQ) stockholder thereof,
              has incurred or will incur on behalf of PCI, any broker-
              age, finder's or similar fee in connection with the trans-
              actions contemplated by this Agreement.

                   (f)  Neither MEDIQ nor any of its affiliates has
              taken or agreed to take any action that (without giving
              effect to any actions taken or agreed to be taken by PCI,
              Cardinal or any of their respective affiliates (other than
              MEDIQ)) would prevent Cardinal from accounting for the
              business combination to be effected by the Merger as a
              pooling-of-interests for financial reporting purposes.  

                   8.2  Survival of Representations and Warranties.  The
         representations and warranties made herein by the parties here-
         to shall not survive the Effective Time.  This Section 8.2
         shall not limit any covenant or agreement of the parties here-
         to, which by its terms contemplates performance after the Ef-
         fective Time or the termination of this Agreement.






                                       -48-<PAGE>







                   8.3  Notices.  All notices and other communications
         hereunder shall be in writing and shall be deemed given if de-
         livered personally, telecopied (which is confirmed) or dis-
         patched by a nationally recognized overnight courier service to
         the parties at the following addresses (or at such other ad-
         dress for a party as shall be specified by like notice):

                   (a)  if to Cardinal or Subcorp:

                        Cardinal Health, Inc.
                        5555 Glendon Court
                        Dublin, Ohio  43016
                        Attention:  Robert D. Walter
                        Telecopy No.:  (614) 717-8919

                        with a copy to

                        David A. Katz, Esq.
                        Wachtell, Lipton, Rosen & Katz
                        51 West 52nd Street
                        New York, New York  10019
                        Telecopy No.:  (212) 403-2000

                   (b)  if to PCI:

                        PCI Services, Inc.
                        3001 Red Lion Road
                        Philadelphia, PA  19114
                        Attention:  Bernard J. Korman
                        Telecopy No.:  (215) 612-1555

                        with a copy to

                        Michael P. Gallagher, Esq.
                        Ballard Spahr Andrews & Ingersoll
                        1735 Market Street
                        Philadelphia, PA  19103
                        Telecopy No.:  (215) 864-8999

                   (c)  if to MEDIQ:

                        MEDIQ Incorporated
                        One Mediq Plaza
                        Pennsauken, NJ  08110
                        Attention:  Thomas E. Carroll
                        Telecopy No.:  (609) 665-2391






                                       -49-<PAGE>







                        with a copy to

                        F. Douglas Raymond, III, Esq.
                        Drinker Biddle & Reath
                        Philadelphia National Bank Building
                        1345 Chestnut Street
                        Philadelphia, PA  19107
                        Telecopy No.:  (215) 988-2757

                   8.4  Interpretation.  When a reference is made in
         this Agreement to an Article or Section, such reference shall
         be to an Article or Section of this Agreement unless otherwise
         indicated.  The headings and the table of contents contained in
         this Agreement are for reference purposes only and shall not
         affect in any way the meaning or interpretation of this Agree-
         ment.  When a reference is made in this Agreement to PCI, such
         reference shall be deemed to include any and all subsidiaries
         of PCI, individually and in the aggregate, except for Sections
         4.1, 4.2, 4.3, 4.4, 4.6, 4.8, 4.16, 4.19, 4.24 and 4.28.  For
         the purposes of any provision of this agreement, a "material
         adverse effect" with respect to any party shall be deemed to
         occur if the aggregate consequences of all breaches and inac-
         curacies of covenants and representations of such party under
         this Agreement, when read without any exception or qualifica-
         tion for a material adverse effect, are reasonably likely to
         have a material adverse effect on the assets, liabilities,
         prospects, results of operations or financial condition of such
         party and its subsidiaries taken as a whole.  

                   8.5  Counterparts.  This Agreement may be executed in
         counterparts, which together shall constitute one and the same
         Agreement.  The parties may execute more than one copy of the
         Agreement, each of which shall constitute an original.

                   8.6  Entire Agreement.  This Agreement (including the
         documents and the instruments referred to herein), the Support
         Agreements, the MEDIQ Option Agreement and the Confidentiality
         Agreement constitute the entire agreement among the parties and
         supersede all prior agreements and understandings, agreements
         or representations by or among the parties, written and oral,
         with respect to the subject matter hereof and thereof.

                   8.7  Third Party Beneficiaries.  Nothing in this
         Agreement, express or implied, is intended or shall be con-
         strued to create any third party beneficiaries other than Sec-
         tions 5.2(b).

                   8.8  Governing Law.  This Agreement shall be governed
         and construed in accordance with the laws of the State of Dela-
         ware without regard to principles of conflicts of law.


                                       -50-<PAGE>







                   8.9  Specific Performance.  The transactions contem-
         plated by this Agreement are unique.  Accordingly, each of the
         parties acknowledges and agrees that, in addition to all other
         remedies to which it may be entitled, each of the parties here-
         to is entitled to a decree of specific performance, provided
         such party is not in material default hereunder.

                   8.10  Assignment.  Neither this Agreement nor any of
         the rights, interests or obligations hereunder shall be as-
         signed by any of the parties hereto (whether by operation of
         law or otherwise) without the prior written consent of the
         other parties.  Subject to the preceding sentence, this Agree-
         ment shall be binding upon, inure to the benefit of and be en-
         forceable by the parties and their respective successors and
         assigns.

                   8.11  Registration Rights.  At any time after the
         occurrence of a Purchase Event (as defined in the MEDIQ Option
         Agreement), PCI shall, if requested by any holder (each a
         "Holder") or Beneficial Owner (as defined in the MEDIQ Option
         Agreement) of shares of PCI Common Stock acquired upon exercise
         of the Option (as defined in the MEDIQ Option Agreement), as
         expeditiously as possible file a registration statement on a
         form for general use under the Securities Act if necessary in
         order to permit the sale or other disposition of the shares of
         PCI Common Stock that have been acquired upon exercise of the
         Option in accordance with the intended method of sale or other
         disposition requested by any such Holder.  Each such Holder
         shall provide all information reasonably requested by PCI for
         inclusion in any registration statement to be filed hereunder.
         PCI shall use its best efforts to cause such registration
         statement first to become effective and then to remain effec-
         tive for such period not in excess of 180 days from the day
         such registration statement first becomes effective as may be
         reasonably necessary to effect such sales or other disposi-
         tions.  The registration effected under this Section 8.11 shall
         be at such Holders' expense.  In no event shall PCI be required
         to effect more than two registrations hereunder.  The filing of
         any registration statement required hereunder may be delayed
         for such period of time (not to exceed 60 days) as may rea-
         sonably be required to facilitate any public distribution by
         PCI of PCI Common Stock or if a special audit of PCI would
         otherwise be required in connection therewith.  If requested by
         any such Holder in connection with such registration, PCI shall
         become a party to any underwriting agreement relating to the
         sale of such shares on terms and including obligations and
         indemnities which are customary for parties similarly situated.
         Upon receiving any request for registration under this Section
         8.11 from any Holder, PCI agrees to send a copy thereof to any
         other person known to PCI to be entitled to registration rights


                                       -51-<PAGE>







         under this Section 8.11, in each case by promptly mailing the
         same, postage prepaid, to the address of record of the persons
         entitled to receive such copies.

                   8.12  Expenses.  Subject to the provisions of Section
         7.2., Cardinal, PCI and MEDIQ shall pay their own costs and
         expenses associated with the transactions contemplated by this
         Agreement.












































                                       -52-<PAGE>







                   IN WITNESS WHEREOF, Cardinal, Subcorp, PCI and MEDIQ
         have signed this Agreement as of the date first written above.

                                    CARDINAL HEALTH, INC.



                                    By: /s/ Robert D. Walter           
                                        Name:   Robert D. Walter
                                        Title:  Chairman & CEO 



                                    PANTHER MERGER CORP.



                                    By: /s/ Robert D. Walter           
                                        Name:   Robert D. Walter
                                        Title:  Chairman & CEO



                                    PCI SERVICES, INC.



                                    By: /s/ Theodore H. Seidenberg     
                                        Name:   Theodore H. Seidenberg
                                        Title:  Chairman of the Board



                                    MEDIQ INCORPORATED (As to Sections
                                    5.1, 5.3(b), (e) and (i), 7.3 and
                                    7.4 and Article VIII (other than
                                    Section 8.11) only)



                                    By: /s/ Michael Sandler            
                                        Name:   Michael Sandler
                                        Title:  Senior Vice President -
                                                Finance & Chief
                                                Financial Officer







                                       -53-

                                                      [CONFORMED COPY]







                             STOCK OPTION AGREEMENT


                   STOCK OPTION AGREEMENT ("Option Agreement") dated
         July 23, 1996, between CARDINAL HEALTH, INC., an Ohio
         corporation ("Cardinal"), MEDIQ INVESTMENT SERVICES, INC., a
         Delaware corporation ("MEDIQ Investment"), and MEDIQ
         INCORPORATED, a Delaware corporation (together with MEDIQ
         Investment, "MEDIQ").

                              W I T N E S S E T H:

                   WHEREAS, the Board of Directors of Cardinal, the
         Board of Directors of PCI Services, Inc., a Delaware
         corporation ("PCI"), and the Board of Directors of MEDIQ have
         approved an Agreement and Plan of Merger dated as of even
         date herewith (the "Merger Agreement") providing for the
         merger of a wholly owned subsidiary of Cardinal with and into
         PCI; 

                   WHEREAS, as a condition and inducement to
         Cardinal's willingness to enter into the Merger Agreement,
         Cardinal has required that MEDIQ agree, and MEDIQ has agreed,
         to grant to Cardinal the option set forth herein to purchase
         all shares of PCI Common Stock owned, directly or indirectly,
         or hereafter acquired, directly or indirectly, by MEDIQ (the
         "Shares");

                   NOW, THEREFORE, in consideration of the premises
         herein contained, the parties agree as follows:

                   1.  Definitions.

                   Capitalized terms used but not defined herein shall
         have the same meanings as in the Merger Agreement.  

                   2.  Grant of Option.

                   Subject to the terms and conditions set forth
         herein, MEDIQ hereby grants to Cardinal an irrevocable option
         (the "Option") to purchase all of the Shares at a price per
         share (the "Purchase Price") equal to the lower of (x) $23.00
         or (y) the Exchange Ratio multiplied by the closing price of
         Cardinal Common Shares as reported on the NYSE composite tape
         on the last trading day immediately preceding the Notice Date
         (as hereinafter defined), payable in cash as provided in Sec-
         tion 4 hereof, provided that, notwithstanding the foregoing,
         in no event shall the Purchase Price be less than $19.53.

                   3.  Exercise of Option.

                   (a)  Cardinal may exercise the Option, in whole or
         (subject to the limitation set forth in the last sentence
         hereof) in part, at any time or from time to time if a
         Purchase Event<PAGE>







         (as defined below) shall have occurred;  provided, however,
         that, to the extent the Option shall not have been previously
         exercised, it shall terminate and be of no further force and
         effect upon the earliest to occur of (i) the Effective Time
         of the Merger and (ii) the termination of the Merger Agree-
         ment in accordance with Sections 7.1(a), 7.1(b), 7.1(c)
         (other than a termination by Cardinal pursuant to Section
         7.1(c) of the Merger Agreement if PCI's, MEDIQ's or PCI's
         affiliate's failure to perform any material covenant or obli-
         gation under the Merger Agreement has been the cause of or
         resulted in the failure of the Merger to occur on or before
         January 31, 1997), or 7.1(d) of the Merger Agreement; pro-
         vided further, however, if (x) the Merger Agreement is termi-
         nated other than as provided in clause (ii) above, or (y) the
         termination of the Merger Agreement (other than a termination
         (I) pursuant to Section 7.1(a) or (II) by PCI pursuant to
         Section 7.1(c) of the Merger Agreement if Cardinal's or
         Cardinal's affiliate's failure to perform any material
         covenant or obligation under the Merger Agreement has been
         the cause of or resulted in the failure of the Merger to oc-
         cur on or before January 31, 1997) occurs after a Purchase
         Event, the Option shall not terminate until the date that is
         6 months following such termination.  Notwithstanding the
         foregoing, if the Option cannot be exercised before its date
         of termination as a result of any injunction, order or simi-
         lar restraint issued by a court of competent jurisdiction,
         the Option shall expire on the 30th business day after such
         injunction, order or restraint shall have been dissolved or
         when such injunction, order or restraint shall have become
         permanent and no longer subject to appeal, as the case may
         be.  To the extent Cardinal exercises the Option in part,
         Cardinal may only exercise the Option for up to 390,499
         Shares in the aggregate, unless Cardinal exercises the Option
         for at least 2,253,876 Shares in the aggregate.

                   (b)  As used herein, a "Purchase Event" shall mean
         any of the following events:

                   (i)  any person (other than Cardinal or any of its
              subsidiaries) shall have commenced (as such term is
              defined in Rule 14d-2 under the Securities Exchange Act
              of 1934, as amended (the "Exchange Act")), or shall have
              filed a registration statement under the Securities Act
              of 1933, as amended (the "Securities Act"), with respect
              to, a tender offer or exchange offer to purchase any
              shares of PCI Common Stock such that, upon consummation
              of such offer, such person would own or control 10% or
              more of the then outstanding PCI Common Stock;

                  (ii)  PCI or any of its subsidiaries shall or shall
              have entered into, authorized, recommended, proposed or
              publicly announced an intention to enter into, autho-
              rize, recommend, or propose, an agreement, arrangement
              or understanding with any person (other than Cardinal or
              any


                                      -2-<PAGE>







              of its subsidiaries) to, or any person (other than
              Cardinal or any of its subsidiaries) shall have publicly
              announced a bona fide present intention to, (A) effect
              any Competing Transaction with PCI, (B) purchase, lease
              or otherwise acquire 10% or more of the assets of PCI
              and its consolidated subsidiaries or (C) purchase or
              otherwise acquire (including by way of merger, consoli-
              dation, tender or exchange offer or similar transaction)
              Beneficial Ownership (as defined below) of securities
              representing 10% or more of the voting power of PCI or
              any of its "significant subsidiaries" (as defined under
              Regulation S-X);

                 (iii)  any person (other than Cardinal or any subsid-
              iary of Cardinal, and other than MEDIQ) shall have
              acquired Beneficial Ownership or the right to acquire
              Beneficial Ownership of 10% or more of the voting power
              of PCI;

                  (iv)  MEDIQ shall have hereafter acquired Beneficial
              Ownership, or the right to acquire Beneficial Ownership,
              of an additional 1% or more of the voting power of PCI
              over that which it currently possesses, not including
              any increase resulting solely from the purchase or other
              acquisition by PCI of shares of PCI Common Stock;

                   (v)  PCI's Board of Directors shall have withdrawn,
              modified or changed in a manner adverse to Cardinal, or
              refused to reaffirm within two business days of any
              written request from Cardinal which request was made
              upon a reasonable basis, the recommendation of PCI's
              Board of Directors with respect to the Merger Agreement
              and/or the Merger;

                  (vi)  if MEDIQ shall have breached any of its obli-
              gations under that certain Support/Voting Agreement,
              dated the date hereof, between MEDIQ and Cardinal or
              under the Merger Agreement;

                 (vii)  if at the meeting of PCI Stockholders (includ-
              ing any adjournment or postponement thereof) the requi-
              site vote of the PCI Stockholders to approve the Merger
              and the transactions contemplated by the Merger Agree-
              ment shall not have been obtained; or

                (viii)  the Merger Agreement shall have been termi-
              nated by either party pursuant to Section 7.1 thereof
              (other than a termination pursuant to Sections 7.1(a),
              7.1(b), 7.1(c) (other than a termination by Cardinal
              pursuant to Section 7.1(c) of the Merger Agreement if
              PCI's,


                                      -3-<PAGE>







              MEDIQ's or PCI's affiliate's failure to perform any ma-
              terial covenant or obligation under the Merger Agreement
              has been the cause of or resulted in the failure of the
              Merger to occur on or before January 31, 1997), or
              7.1(d)) or any event shall have occurred that would
              cause any party thereto to have the right to so termi-
              nate the Merger Agreement.

                   (c)  As used herein, the terms "Beneficial Owner-
         ship", "Beneficial Owner" and "Beneficially Own" shall have
         the meanings ascribed to them in Rule 13d-3 under the Ex-
         change Act.  As used herein, "person" shall have the meaning
         specified in Sections 3(a)(9) and 13(d)(3) of the Exchange
         Act.

                   (d)  In the event Cardinal wishes to exercise the
         Option, it shall deliver to MEDIQ a written notice (the date
         of which being herein referred to as the "Notice Date")
         specifying (i) the total number of Shares it intends to pur-
         chase pursuant to such exercise and (ii) a place and date not
         earlier than two business days nor later than 30 calendar
         days from the Notice Date for the closing of such purchase
         (the "Closing Date"); provided that if the closing of the
         purchase and sale pursuant to the Option (the "Closing")
         cannot be consummated by reason of any applicable judgment,
         decree, order, law or regulation, the period of time that
         otherwise would run pursuant to this sentence shall run
         instead from the date on which such restriction on
         consummation has expired or been terminated; and, provided
         further that, without limiting the foregoing, if prior
         notification to or approval of any regulatory authority is
         required in connection with such purchase, Cardinal and, if
         applicable, MEDIQ shall promptly file the required notice or
         application for approval and shall expeditiously process the
         same (and MEDIQ shall cooperate with Cardinal in the filing
         of any such notice or application and the obtaining of any
         such approval), and the period of time that otherwise would
         run pursuant to this sentence shall run instead from the date
         on which, as the case may be, (i) any required notification
         period has expired or been terminated or (ii) such approval
         has been obtained, and in either event, any requisite waiting
         period has passed.

                   (e)  In the event (i) Cardinal receives official
         notice that an approval of any regulatory authority required
         for the purchase of the Shares pursuant to exercise of the
         Option would not be issued or granted or (ii) a Closing Date
         shall not have occurred within 9 months after the related
         Notice Date due to the failure to obtain any such required
         approval, Cardinal shall be entitled, to the extent legally
         permitted, to


                                      -4-<PAGE>







         exercise the Option in connection with the resale of PCI Com-
         mon Stock or other securities pursuant to a registration
         statement as provided in Section 8.11 of the Merger
         Agreement.  The provisions of this Section 3 and Section 6
         shall apply with appropriate adjustments to any such
         exercise.

                   4.  Payment and Delivery of Certificates.

                   (a)  At the Closing, referred to in Section 3
         hereof, Cardinal shall pay to MEDIQ the aggregate Purchase
         Price for the shares of PCI Common Stock purchased pursuant
         to the exercise of the Option in immediately available funds
         by wire transfer to a bank account designated not later than
         one business day prior to the Closing Date by MEDIQ.

                   (b)  At such Closing, simultaneously with the de-
         livery of cash as provided in Section 4(a), MEDIQ shall
         transfer to Cardinal good, valid and marketable title to, and
         shall deliver to Cardinal a certificate or certificates
         representing, the number of Shares purchased by Cardinal,
         registered in the name of Cardinal or a nominee designated in
         writing by Cardinal (or, if it is not possible to have such
         registration completed prior to the Closing, the
         certificate(s) delivered shall be accompanied by appropriate
         stock power(s) in form reasonably satisfactory to Cardinal),
         which Shares shall be fully paid and non-assessable and free
         and clear of all liens, claims, charges and encumbrances of
         any kind whatsoever.

                   (c)  If at the time of issuance of any PCI Common
         Stock pursuant to any exercise of the Option, PCI shall have
         issued any share purchase rights or similar securities to
         holders of PCI Common Stock, then each such Share shall also
         represent rights with terms substantially the same as and at
         least as favorable to Cardinal as those issued to MEDIQ.

                   5.  Authorization, etc.

                   (a)  MEDIQ hereby represents and warrants to
         Cardinal that: 

                   (i)  MEDIQ has full corporate authority to execute
              and deliver this Option Agreement and to consummate the
              transactions contemplated hereby;

                  (ii)  such execution, delivery and consummation have
              been authorized by the Board of Directors of MEDIQ, and
              no other corporate proceedings are necessary therefor; 

                 (iii)  this Option Agreement has been duly and val-
              idly executed and delivered and represents a valid and
              legally binding obligation of MEDIQ, enforceable against
              MEDIQ in accordance with its terms; 


                                      -5-<PAGE>







                  (iv)  MEDIQ Investment is the registered owner, and
              MEDIQ Incorporated is the sole beneficial owner (in ad-
              dition to the registered owner), of, and has good, valid
              and marketable title to, 2,875,000 shares of PCI Common
              Stock, which are all of the shares of PCI Common Stock
              owned, directly or indirectly, by MEDIQ, and MEDIQ does
              not have any right to acquire any additional shares of
              PCI Common Stock; and 

                   (v)  MEDIQ has taken all necessary corporate action
              to authorize and permit it to sell the Shares upon exer-
              cise of the Option, all of which, upon sale pursuant
              hereto, shall have been duly authorized, validly issued,
              fully paid and nonassessable, and shall be delivered
              free and clear of all claims, liens, encumbrances, re-
              strictions and security interests and not subject to any
              preemptive rights. 

                   (b)  Cardinal hereby represents and warrants to
         MEDIQ that:  

                   (i)  Cardinal has full corporate authority to ex-
              ecute and deliver this Option Agreement and to consum-
              mate the transactions contemplated hereby; 

                  (ii)  such execution, delivery and consummation have
              been authorized by all requisite corporate action by
              Cardinal, and no other corporate proceedings are neces-
              sary therefor; 

                 (iii)  this Option Agreement has been duly and val-
              idly executed and delivered and represents a valid and
              legally binding obligation of Cardinal, enforceable
              against Cardinal in accordance with its terms; and

                  (iv)  any PCI Common Stock or other securities
              acquired by Cardinal upon exercise of the Option will
              not be taken with a view to the public distribution
              thereof and will not be transferred or otherwise
              disposed of except in compliance with the Securities
              Act.

                   6.  Adjustment upon Changes in Capitalization.

                   In the event of any change in PCI Common Stock by
         reason of a stock dividend, split-up, recapitalization,
         merger, consolidation, reorganization, combination, exchange
         of shares or similar transaction, the type and number of
         shares or securities subject to the Option, and the Purchase
         Price therefor, shall be adjusted appropriately so that
         Cardinal shall receive upon exercise of the Option the same
         class and


                                      -6-<PAGE>







         number of outstanding shares or other securities or property
         that Cardinal would have received in respect of PCI Common
         Stock if the Option had been exercised immediately prior to
         such event, or the record date therefor, as applicable.

                   7.  Severability.

                   Any term, provision, covenant or restriction con-
         tained in this Option Agreement held by a court or other Gov-
         ernmental Authority of competent jurisdiction to be invalid,
         void or unenforceable, shall be ineffective to the extent of
         such invalidity, voidness or unenforceability, but neither
         the remaining terms, provisions, covenants or restrictions
         contained in this Option Agreement nor the validity or en-
         forceability thereof in any other jurisdiction shall be af-
         fected or impaired thereby.  Any term, provision, covenant or
         restriction contained in this Option Agreement that is so
         found to be so broad as to be unenforceable shall be inter-
         preted to be as broad as is enforceable.  

                   8.  Miscellaneous.

                   (a)  Expenses.  Each of the parties hereto shall
         pay all costs and expenses incurred by it or on its behalf in
         connection with the transactions contemplated hereunder, in-
         cluding fees and expenses of its own financial consultants,
         investment bankers, accountants and counsel, except as other-
         wise provided herein.

                   (b)  Entire Agreement.  This Option Agreement, the
         Support Agreements, the Merger Agreement (including the docu-
         ments and the instruments referred to therein) and the Con-
         fidentiality Agreement constitute the entire agreement among
         the parties and supersede all prior agreements and
         understandings, agreements or representations by or among the
         parties, written and oral, with respect to the subject matter
         hereof and thereof.

                   (c)  Successors; No Third Party Beneficiaries.  The
         terms and conditions of this Option Agreement shall inure to
         the benefit of and be binding upon the parties hereto and
         their respective successors and permitted assigns.  Nothing
         in this Option Agreement, expressed or implied, is intended
         to confer upon any party, other than the parties hereto, and
         their respective successors and assigns, any rights, reme-
         dies, obligations, or liabilities under or by reason of this
         Option Agreement, except as expressly provided herein.

                   (d)  Notices.  All notices or other communications
         which are required or permitted hereunder shall be in writing


                                      -7-<PAGE>







         and sufficient if delivered in accordance with Section 8.3 of
         the Merger Agreement (which is incorporated herein by ref-
         erence).

                   (e)  Counterparts.  This Option Agreement may be
         executed in counterparts, and each such counterpart shall be
         deemed to be an original instrument, but both such counter-
         parts together shall constitute but one agreement.

                   (f)  Further Assurances.  In the event of any exer-
         cise of the Option by Cardinal, MEDIQ and Cardinal shall
         execute and deliver all other documents and instruments and
         take all other action that may be reasonably necessary in
         order to consummate the transactions provided for by such
         exercise.

                   (g)  Specific Performance.  The parties hereto
         agree that if for any reason Cardinal or MEDIQ shall have
         failed to perform its obligations under this Option Agree-
         ment, then either party hereto seeking to enforce this Option
         Agreement against such non-performing party shall be entitled
         to specific performance and injunctive and other equitable
         relief, and the parties hereto further agree to waive any re-
         quirement for the securing or posting of any bond in connec-
         tion with the obtaining of any such injunctive or other equi-
         table relief.  This provision is without prejudice to any
         other rights that either party hereto may have against the
         other party hereto for any failure to perform its obligations
         under this Option Agreement.

                   (h)  Governing Law.  This Option Agreement shall be
         governed by and construed in accordance with the laws of the
         State of Delaware applicable to agreements made and entirely
         to be performed within such state.  Nothing in this Option
         Agreement shall be construed to require any party (or any
         subsidiary or affiliate of any party) to take any action or
         fail to take any action in violation of applicable law, rule
         or regulation.

                   (i)  Regulatory Approvals.  If, in connection with
         the exercise of the Option under Section 3, prior notifica-
         tion to or approval of any Governmental Authority is
         required, then the required notice or application for ap-
         proval shall be promptly filed and/or expeditiously processed
         by MEDIQ and periods of time that otherwise would run pursu-
         ant hereto (if any) shall run instead from the date on which
         any such required notification period has expired or been
         terminated or such approval has been obtained, and in either
         event, any requisite waiting period shall have passed.  



                                      -8-<PAGE>







                   (j)  Waiver and Amendment.  Any provision of this
         Option Agreement may be waived at any time by the party that
         is entitled to the benefits of such provision.  This Option
         Agreement may not be modified, amended, altered or supple-
         mented except upon the execution and delivery of a written
         agreement executed by the parties hereto.














































                                      -9-<PAGE>








                   IN WITNESS WHEREOF, each of the parties hereto has
         executed this Option Agreement as of the date first written
         above.

                                       CARDINAL HEALTH, INC.




                                       By: /s/ Robert D. Walter                
                                           Name:  Robert D. Walter
                                           Title: Chairman & CEO



                                       MEDIQ INVESTMENT SERVICES, INC.




                                       By: /s/ Michael Sandler                 
                                           Name:  Michael Sandler
                                           Title: Vice President &
                                                  Chief Financial Officer



                                       MEDIQ INCORPORATED




                                       By: /s/ Michael Sandler                 
                                           Name:  Michael Sandler
                                           Title: Senior Vice President -
                                                  Finance & Chief
                                                  Financial Officer 














                                      -10-

                                                      [CONFORMED COPY]













                                       July 23, 1996


         Cardinal Health, Inc.
         5555 Glendon Court
         Dublin, Ohio  43016

                   Re:  Support/Voting Agreement

         Dear Sirs:  

                   The undersigned understand that Cardinal Health,
         Inc. ("Cardinal"), Panther Merger Corp., a wholly owned
         subsidiary of Cardinal ("Subcorp"), MEDIQ Incorporated and
         PCI Services, Inc. ("PCI") are entering into an Agreement and
         Plan of Merger, dated the date hereof (the "Agreement"),
         providing for, among other things, a merger between Subcorp
         and PCI (the "Merger"), in which all of the outstanding
         shares of capital stock of PCI will be exchanged for common
         shares, without par value, of Cardinal.

                   MEDIQ Investment Services, Inc. is a stockholder of
         PCI (together with MEDIQ Incorporated, the "Stockholder") and
         is entering into this letter agreement to induce you to enter
         into the Agreement and to consummate the transactions
         contemplated thereby.

                   The Stockholder confirms its agreement with you as
         follows:

                   1.  The Stockholder represents, warrants and agrees
         that Schedule I annexed hereto sets forth the shares of the
         capital stock of PCI of which the Stockholder or its
         affiliates (as defined under the Securities Exchange Act of
         1934, as amended), other than the directors of Stockholder,
         is the record or beneficial owner (the "Shares") and that the
         Stockholder and its affiliates, other than the directors of
         Stockholder, are on the date hereof the lawful owners of the
         number of Shares set forth in Schedule I, free and clear of
         all liens, charges, encumbrances, voting agreements and
         commitments of every kind, except as disclosed in Schedule I.
         Except as set forth in Schedule I, neither the Stockholder
         nor any of its affiliates, other than the directors of
         Stockholder, own or hold any rights to acquire any additional
         shares of the capital stock of PCI (by exercise of stock
         options or otherwise) or any interest therein or any voting
         rights with respect to any additional shares.  

                   2.  The Stockholder agrees that it will not, will
         not permit any company, trust or other entity controlled by
         the Stockholder to, and will not permit any of its affiliates
         to, contract to sell, sell or otherwise transfer or dispose
         of any of the Shares or any interest therein or securities
         convertible thereinto or any voting rights with respect
         thereto, other than (i) pursuant to the Merger or (ii) with
         your prior written consent.<PAGE>








                   3.  The Stockholder agrees to, will cause any
         company, trust or other entity controlled by the Stockholder
         to, and will cause its affiliates to, cooperate fully with
         you in connection with the Agreement and the transactions
         contemplated thereby.  The Stockholder agrees that it will
         not, will not permit any such company, trust or other entity
         to, and will not permit any of its affiliates to, directly or
         indirectly (including through its officers, directors,
         employees or other representatives) to solicit, initiate, en-
         courage or facilitate, or furnish or disclose non-public
         information in furtherance of, any inquiries or the making of
         any proposal with respect to any recapitalization, merger,
         consolidation or other business combination involving PCI, or
         acquisition of any capital stock or any material portion of
         the assets (except for acquisition of assets in the ordinary
         course of business consistent with past practice) of PCI, or
         any combination of the foregoing (a "Competing Transaction"),
         or negotiate, explore or otherwise engage in discussions with
         any person (other than Cardinal, Subcorp or their respective
         directors, officers, employees, agents and representatives)
         with respect to any Competing Transaction or enter into any
         agreement, arrangement or understanding with respect to any
         Competing Transaction or agree to or otherwise assist in the
         effectuation of any Competing Transaction; provided, however,
         that nothing herein shall require Stockholder to prevent or
         restrict any director of Stockholder who is a director or
         officer of PCI from taking any action to the extent such
         director or officer would be permitted to take such action
         under the Agreement and under any Support/Voting Agreement
         with Cardinal dated the date hereof to which such director or
         officer is a party.

                   4.  The Stockholder agrees that all of the Shares
         beneficially owned by the Stockholder or its affiliates, or
         over which the Stockholder or any of its affiliates has
         voting power or control, directly or indirectly (including
         any common shares of PCI acquired after the date hereof), at
         the record date for any meeting of stockholders of PCI called
         to consider and vote to approve the Merger and the Agreement
         and/or the transactions contemplated thereby will be voted by
         the Stockholder or its affiliates in favor thereof and that
         neither the Stockholder nor any of its affiliates will vote
         such Shares in favor of any Competing Transaction.

                   5.   The Stockholder has all necessary power and
         authority to enter into this letter agreement.  This agree-
         ment is the legal, valid and binding agreement of the Stock-
         holder, and is enforceable against the Stockholder in ac-
         cordance with its terms.

                   6.   The Stockholder agrees that damages are an in-
         adequate remedy for the breach by Stockholder of any term or
         condition of this letter agreement and that you shall be en-
         titled to a temporary restraining order and preliminary and
         permanent injunctive relief in order to enforce our agree-
         ments herein.  


                                     - 2 -<PAGE>








                   This letter agreement may be terminated at the op-
         tion of any party at any time upon the earlier of (i) ter-
         mination of the Agreement and (ii) the Effective Time (as de-
         fined in the Agreement).  Please confirm that the foregoing
         correctly states the understanding between us by signing and
         returning to me a counterpart hereof.

                                       Very truly yours,


                                       MEDIQ Incorporated




                                       By: /s/ Michael Sandler            
                                           Michael Sandler
                                           Senior Vice President - Finance
                                           and Chief Financial Officer


                                       MEDIQ Investment Services, Inc.




                                       By: /s/ Michael Sandler            
                                           Michael Sandler
                                           Vice President and Chief
                                           Financial Officer





         Confirmed on the date
         first above written.

         Cardinal Health, Inc.



         By:  /s/ George H. Bennett     
              George H. Bennett
              Executive Vice President
              and General Counsel 




                                     - 3 -<PAGE>







                                   Schedule I

                                Stock Ownership

                       of MEDIQ Investment Services, Inc.


         Owned Beneficially (including Stock Options)


         2,875,000 shares of common stock, $0.001 par value, of PCI
         Services, Inc.












         Owned of Record


         2,875,000 shares of common stock, $0.001 par value, of PCI
         Services, Inc.

                                                      [CONFORMED COPY]













                                       July 23, 1996


         Cardinal Health, Inc.
         5555 Glendon Court
         Dublin, Ohio  43016

                   Re:  Support/Voting Agreement

         Dear Sirs:  

                   The undersigned understands that Cardinal Health,
         Inc. ("Cardinal"), Panther Merger Corp., a wholly owned
         subsidiary of Cardinal ("Subcorp"), MEDIQ, Incorporated and
         PCI Services, Inc. ("PCI") are entering into an Agreement and
         Plan of Merger, dated the date hereof (the "Agreement"),
         providing for, among other things, a merger between Subcorp
         and PCI (the "Merger"), in which all of the outstanding
         shares of capital stock of PCI will be exchanged for common
         shares, without par value, of Cardinal.

                   The undersigned is a stockholder of PCI (the
         "Stockholder") and is entering into this letter agreement to
         induce you to enter into the Agreement and to consummate the
         transactions contemplated thereby.

                   The Stockholder confirms its agreement with you as
         follows:

                   1.  The Stockholder represents, warrants and agrees
         that Schedule I annexed hereto sets forth the shares of the
         capital stock of PCI of which the Stockholder or its
         affiliates (as defined under the Securities Exchange Act of
         1934, as amended) is the record or beneficial owner (the
         "Shares") and that the Stockholder and its affiliates are on
         the date hereof the lawful owners of the number of Shares set
         forth in Schedule I, free and clear of all liens, charges,
         encumbrances, voting agreements and commitments of every
         kind, except as disclosed in Schedule I.  Except as set forth
         in Schedule I, neither the Stockholder nor any of its
         affiliates own or hold any rights to acquire any additional
         shares of the capital stock of PCI (by exercise of stock
         options or otherwise) or any interest therein or any voting
         rights with respect to any additional shares.  

                   2.  The Stockholder agrees that it will not, will
         not permit any company, trust or other entity controlled by
         the Stockholder to, and will not permit any of its affiliates
         to, contract to sell, sell or otherwise transfer or dispose
         of any of the Shares or any interest therein or securities
         convertible thereinto or any voting rights with respect
         thereto, other than (i) pursuant to the Merger or (ii) with
         your prior written consent.<PAGE>








                   3.  The Stockholder agrees to, will cause any
         company, trust or other entity controlled by the Stockholder
         to, and will cause its affiliates to, cooperate fully with
         you in connection with the Agreement and the transactions
         contemplated thereby.  The Stockholder agrees that it will
         not, will not permit any such company, trust or other entity
         to, and will not permit any of its affiliates to, directly or
         indirectly (including through its officers, directors,
         employees or other representatives) to solicit, initiate, en-
         courage or facilitate, or furnish or disclose non-public
         information in furtherance of, any inquiries or the making of
         any proposal with respect to any recapitalization, merger,
         consolidation or other business combination involving PCI, or
         acquisition of any capital stock or any material portion of
         the assets (except for acquisition of assets in the ordinary
         course of business consistent with past practice) of PCI, or
         any combination of the foregoing (a "Competing Transaction"),
         or negotiate, explore or otherwise engage in discussions with
         any person (other than Cardinal, Subcorp or their respective
         directors, officers, employees, agents and representatives)
         with respect to any Competing Transaction or enter into any
         agreement, arrangement or understanding with respect to any
         Competing Transaction or agree to or otherwise assist in the
         effectuation of any Competing Transaction; provided, however,
         that nothing herein shall prevent the Stockholder from taking
         any action, after having notified Cardinal thereof, or
         omitting to take any action (i) solely as a member of the
         Board of Directors of PCI required so as not to violate such
         Stockholder's fiduciary obligations as a Director as so
         advised by outside counsel or (ii) if Stockholder is an
         officer of PCI, as directed by the Board of Directors of PCI
         so long as such direction was not made in violation of any of
         the terms of the Agreement.  

                   4.  The Stockholder agrees that all of the Shares
         beneficially owned by the Stockholder or its affiliates, or
         over which the Stockholder or any of its affiliates has
         voting power or control, directly or indirectly (including
         any common shares of PCI acquired after the date hereof), at
         the record date for any meeting of stockholders of PCI called
         to consider and vote to approve the Merger and the Agreement
         and/or the transactions contemplated thereby will be voted by
         the Stockholder or its affiliates in favor thereof and that
         neither the Stockholder nor any of its affiliates will vote
         such Shares in favor of any Competing Transaction.

                   5.   The Stockholder has all necessary power and
         authority to enter into this letter agreement.  This agree-
         ment is the legal, valid and binding agreement of the Stock-
         holder, and is enforceable against the Stockholder in ac-
         cordance with its terms.

                   6.   The Stockholder agrees that damages are an in-
         adequate remedy for the breach by Stockholder of any term or
         condition of this letter agreement and that you shall be en-
         titled to a temporary restraining order and preliminary and
         permanent injunctive relief in order to enforce our agree-
         ments herein.  


                                     - 2 -<PAGE>








                   This letter agreement may be terminated at the op-
         tion of any party at any time upon the earlier of (i) ter-
         mination of the Agreement and (ii) the Effective Time (as de-
         fined in the Agreement).  Please confirm that the foregoing
         correctly states the understanding between us by signing and
         returning to me a counterpart hereof.

                                       Very truly yours,



                                       By:                            


         Confirmed on the date
         first above written.

         Cardinal Health, Inc.



         By:  /s/ George H. Bennett      
              George H. Bennett
              Executive Vice President
              and General Counsel

























                                     - 3 -<PAGE>







                                   Schedule I

                                Stock Ownership



         Owned Beneficially (including Stock Options)














         Owned of Record


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