Document:

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                                                                     Exhibit 4.1

         Number                                                  Shares
IT
                                                                 See reverse for
                                                             certain definitions

                                 I-TRAX.COM INC.
              INCORPORATED UNDER THE LAWS OF THE STATE OF DELAWARE

                               COMMON STOCK CUSIP                    45069D 10 4

THIS CERTIFIED THAT:

is owner of

              FULLY PAID AND NON-ASSESSABLE SHARES OF COMMON STOCK
                           OF $.001 PAR VALUE EACH OF
                                 I-TRAX.COM INC.

transferable on the books of the Corporation in person or by attorney upon
surrender of this certificate duly endorsed or assigned. This certificate and
the shares represented hereby are subject to the laws of the State of Delaware,
and to the Certificate of Incorporation and Bylaws of the Corporation, as now or
hereafter amended. This certificate is not valid until countersigned by the
Transfer Agent.

         WITNESS the facsimile seal of the Corporation and the facsimile
signatures of its duly authorized officers.

DATED:                       [SEAL]                COUNTERSIGNED:

                                                               STOCK TRANS, INC.
                                                           7 EAST LANCASTER AVE.
                                                               ARDMORE, PA 19003
                                                                  TRANSFER AGENT

                                                   BY:

                                                            AUTHORIZED SIGNATURE

                  SECRETARY                                            PRESIDENT

                                        1
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         The following abbreviations, when used in the inscription on the face
of this certificate, shall be construed as though they were written out in full
according to applicable laws or regulations:
<TABLE>
<CAPTION>
<S>                                                  <C>
TEN COM - as tenants in common                       UNIF GIFT MIN ACT -.........Custodian.........
TEN ENT - as tenants by the entireties                                           (Cust)           (Minor)
JT TEN - as joint tenants with rights of                                   under Uniforms Gifts to Minors
         survivorship and not as tenants
         in common
</TABLE>

     Additional abbreviations may also be used though not in the above list.

      For Value Received, __________ hereby sell, assign and transfer unto

PLEASE INSERT SOCIAL SECURITY OR OTHER
   IDENTIFYING NUMBER OF ASSIGNEE

   _________________________________

   _________________________________

________________________________________________________________________________
  (PLEASE PRINT OR TYPEWRITE NAME AND ADDRESS, INCLUDING ZIP CODE, OF ASSIGNEE)

________________________________________________________________________________

_________________________________________________________________________ Shares
of the stock represented by the within Certificate, and do hereby irrevocably
constitute and appoint
_______________________________________________________________ Attorney to
transfer the said stock on the books of the within named Corporation with full
power of substitution in the premises.

Dated ____________________

                                        ________________________________________

                                        NOTICE: THE SIGNATURE TO THIS ASSIGNMENT
                                        MUST CORRESPOND WITH THE NAME AS WRITTEN
                                        UPON THE FACE OF THE CERTIFICATE IN
                                        EVERY PARTICULAR, WITHOUT ALTERATION OR
                                        ENLARGEMENT OR ANY CHANGE WHATSOEVER.

THE CORPORATION WILL FURNISH TO ANY STOCKHOLDER, UPON REQUEST AND WITHOUT
CHARGE, A FULL STATEMENT OF THE DESIGNATIONS, RELATIVE RIGHTS, PREFERENCES AND
LIMITATIONS OF THE SHARES OF EACH CLASS AND SERIES AUTHORIZED TO BE ISSUED, SO
FAR AS THE SAME HAVE BEEN DETERMINED, AND OF THE AUTHORITY, IF ANY, OF THE BOARD
TO DIVIDE THE SHARES INTO CLASSES OR SERIES AND TO DETERMINE AND CHANGE THE
RELATIVE RIGHTS, PREFERENCES AND LIMITATIONS OF ANY CLASS OR SERIES. SUCH
REQUEST MAY BE

                                        2
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MADE TO THE SECRETARY OF THE CORPORATION OR TO THE TRANSFER AGENT NAMED ON THIS
CERTIFICATE.
________________________________________________________________________________
THE SIGNATURE TO THE ASSIGNMENT MUST CORRESPOND TO THE NAME AS WRITTEN UPON THE
FACE OF THIS CERTIFICATE IN EVERY PARTICULAR, WITHOUT ALTERATION OR ENLARGEMENT
OR ANY CHANGE WHATSOEVER, AND MUST BE GUARANTEED BY A COMMERCIAL BANK OR TRUST
COMPANY OR A MEMBER FIRM OF NATIONAL OR REGIONAL OR OTHER RECOGNIZED STOCK
EXCHANGE IN CONFORMANCE WITH A SIGNATURE GUARANTEE MEDALLION PROGRAM.

                                        3<PAGE>

                                                                    Exhibit 10.1

                                    AGREEMENT

         This Agreement for the Purchase of Software and Provision of Services
("Agreement") is made as of the date indicated below by and between Member-Link
Systems, Inc., a Delaware corporation ("MLS") with its principal offices at
Reston Plaza 350, 12020 Sunrise Valley Drive, Reston, VA 20191, and The Office
of the Attending Physician of The Capitol ("OAP"), located in the United States
Capitol, Washington DC 20510.

         OAP desires to purchase from MLS, and obtain MLS' services in
installing in the configuration set forth in MLS' Proposal to OAP (incorporated
herein by reference). MLS' I-Trax(R) and AsthmaWatch(R) disease management and
monitoring software and data interfaces using MLS' Medicive(R) database system
and software (collectively, "Software") and specified hardware. For its part,
MLS desires to license the Software to OAP, and provide the specified hardware
and installation services. MLS and OAP therefore AGREE as follows:

A. Incorporation of License Agreements. The Software is being licensed by MLS to
OAP in accordance with the terms of the License Agreements ("Licenses")
separately executed between the parties. The parties hereby agree that the
Licenses, incorporated herein by reference, are part, and shall constitute
essential terms of, this Agreement. As specified therein, nothing in this or any
other Agreement between the parties shall be construed as creating any ownership
interest in the Software in any party other than MLS.

B. Tasks and Scope of Performance, Limitations. In order to ensure the proper,
orderly and efficient installation of its products MLS will perform the
installation of the Software and related tasks in seven phases as set out in its
Proposal to OAP, as modified by the Purchase Order provided to MLS. They are:

         1. Creation of the OAP User Interface

         2. Integration of Legacy Data

         3. Development of Reports and Unique Reports Formats

         4. Installation and Integration of the Software, and Hardware

         (i) It is understood and agreed that MLS' ability properly to perform
the above tasks is necessarily dependent upon the active and timely cooperation
of PCH and its agents, and their accomplishment of predicate tasks. MLS will
neither be liable for, nor subject to any actual or consequential damages
alleged to result from, delays in implementation caused by the mis- or
non-performance of any party under the control of OAP.

                                        1
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         (ii) Pursuant to this Agreement, MLS personnel will remain available to
project site personnel for a period of one year to provide ongoing system
support and address residual issues, either on-site or through an established
dial-in connection to the system. Such service beyond that period, or additional
services, may be obtained from MLS at a contracted hourly rate. Further, as set
forth in the License Agreements, MLS' own licensed software is warranted to be
free from defects for one year, during which period MLS will provide OAP with
any upgraded versions of such software at no additional cost to OAP. Nothing in
this provision may be construed as creating any warranties in excess of those
specified in the provisions of the Licenses referenced in C, below.

         (iii) It is anticipated that all installation work and initial testing
to be performed under this Agreement will be completed on or before March 1,
2000.

C. Disclaimer of Warranty. The Software and all services are subject to the
Limitations on Warranty contained in Section 7 of the Medicive(R)License
Agreements and Sections 10 and 11 of the application software (AsthmaWatch(R)and
I-Trax.(R)) License Agreements.

D. Consideration; Payment. OAP agrees that, in consideration of the goods,
services and licenses provided by MLS under this Agreement, it shall pay MLS
$263,913.10. This price is not inclusive of additional contract services
provided by MLS at OAP's discretion. It is further agreed that one-half (1/2) of
that sum, or $131,956.55, is due upon execution of this Agreement and/or
execution of the Licenses, with the remainder to be tendered upon completion of
the installation.

E. No Agency Relationship. Nothing in this or any of the component Agreements
shall be interpreted as creating any relationship other than that of vendor or
independent contractor.

F. Disputes. Any disputes arising under this Agreement that the parties are
unable to resolve between them may be submitted to nonbinding arbitration
without jeopardizing their respective remedies in law or equity.

G. Jurisdiction; Assignment; Integration; Severability. This Agreement shall be
construed and enforced in accordance with the laws of the State of Virginia.
Neither this Agreement nor any interest in this Agreement may be assigned by
either party without the express written consent of the other. This Agreement,
and the agreements and Licenses incorporated herein, supersedes all prior
documents or understandings on this subject matter, and may be modified only by
a writing executed by both parties. If any term of this Agreement is held
invalid or unenforceable, this Agreement and all remaining terms will remain in
full force and effect as if such invalid or unenforceable term had never been
included. Failure to enforce any particular provision of this Agreement at any
time shall not constitute a waiver of that or any other term or provision of
this Agreement, or future enforcement thereof

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IN WITNESS WHEREOF, the parties have executed this Agreement as of the date
written below.

         Member-Link Systems, Inc.             Office of The Attending Physician
                                               of The Capitol

By: /s/ Hans C. Kastensmith                 By:_________________________________
    -----------------------------
      Hans C. Kastensmith,
      President

Date:____________________________           Date:_______________________________

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