Document:

EXHIBIT 10.6
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                  AMENDMENT NUMBER FIVE TO EMPLOYMENT AGREEMENT

This Amendment between Louis P. Scheps ("Mr. Scheps") and CAS Medical Systems,
Inc. ("CAS") amends an Employment Agreement, dated as of September 1, 1993,
between Mr. Scheps and CAS, as amended prior to the date hereof (the
"Agreement"). Except as otherwise specifically provided in this Amendment, the
Agreement remains in full force and effect.

1.   Term

     The first two sentences of Section I of the Agreement are deleted and the
     following is substituted in their place:

     "Mr. Scheps is employed by CAS as President and Chief Executive Officer,
     and shall serve as a director of CAS if so elected by CAS' stockholders, in
     each case through August 31, 2005.

2.   Compensation

     Section 2 of the Agreement is modified to reflect an annual salary of
     $262,500.

3.   Termination

     The following replaces in its entirety that portion of Section 3 of the
     Agreement added by the September 1998 Amendment Number 1 of the Agreement:

          "If a Change of Control (as hereinafter defined) occurs, and upon such
          Change of Control occurring, this Agreement is not extended for a
          period of one year following the stated termination date of this
          Agreement, then Mr. Scheps shall be paid a lump sum of $262,500 on
          such stated termination date."

          If a Change of Control occurs and Mr. Scheps' employment terminates
          for any reason after such Change of Control occurs, including
          termination by Mr. Scheps, Mr. Scheps will be paid a lump sum of
          $262,500 within ten (10) days of such termination.

          "Change of Control" means (i) a sale of all or substantially all of
          CAS' assets, (ii) a merger involving CAS in which CAS is not the
          survivor and the CAS stockholders prior to the merger control less
          than fifty percent of the voting stock of the surviving entity, (iii)
          a sale by the CAS stockholders to an acquirer or acquirers action in
          concert of more than a majority of the then outstanding stock of CAS
          owned by the CAS stockholders, or (iv) any event similar to any of the
          foregoing.

     IN WITNESS of the foregoing, the parties have executed this Amendment as of
     September 1, 2004.

CAS MEDICAL SYSTEMS, INC.

By: /s/ Jerome Baron                      By: /s/ Louis P. Scheps
    ----------------------------              -----------------------------
    Jerome Baron                              Louis P. Scheps

By: /s/ Lawrence S. Burstein              By: /s/ Saul S. Milles, M.D.
    ----------------------------              -----------------------------
    Lawrence S. Burstein                      Saul S. Milles, M.D.EXHIBIT 10.8
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                            FORM OF OPTION AGREEMENT

This is to certify that you have been granted an option to purchase shares of
CAS Medical Systems, Inc. common stock under the CAS Medical Systems, Inc. 2003
Equity Incentive Plan (the "2003 Plan"). The number of shares for which the
option has been granted, the option price, the date of grant, the vesting
(exercise) terms and the expiration of the grant are specified on the next page
of this Agreement.

Once a portion of the option has become vested (exercisable), that portion of
the option may be exercised any time prior to the end of the term of the option,
except that if you terminate employment with the company, as set forth in the
2003 Plan, prior to the end of the option term for reasons other than death or
disability, you are entitled to exercise any portion of the option that is then
vested for up to three months following your termination but no later than the
last day of the original option term. If it is not exercised by this deadline,
any outstanding vested options will be forfeited. Any portion of the option that
is unvested at the time of your termination for reasons other than death or
disability shall automatically be forfeited upon your termination. If you die or
become disabled while employed, all unvested option shares become vested on the
date of the event and you (your estate or heirs, in the case of death) will be
entitled to exercise your option for the entire original option term; provided
that if this option is an incentive stock option (ISO) you (your estate or
heirs, in the case of death) will be entitled to exercise your option for a
period of one year following the event or until the option term expires,
whichever comes first.

This option is granted in recognition of your efforts and contributions to the
company. It is granted solely on a discretionary basis and is not intended to
create a right or entitlement in the optionee that any actual or unrealized gain
related to the option will be considered regular compensation (including salary,
bonus, merit pay) for severance pay purposes whether under statutory or common
law. In addition, no optionee is entitled to have any vested right to continue
to receive future grants of options, nor shall any options granted to an
optionee become a benefit or entitlement of employment. If you engage in "Gross
Misconduct", as defined in the 2003 Plan, all of your outstanding options as of
your date of termination (whether vested or unvested) shall be forfeited
immediately. The plan and programs under which this option is granted are
subject to future amendment, modification or termination at any time.

THIS OPTION IS SUBJECT IN ALL RESPECTS TO THE DETAILED TERMS AND CONDITIONS OF
THE 2003 PLAN. A COPY OF THE 2003 PLAN HAS BEEN PROVIDED TO YOU OR IS AVAILABLE
FROM THE CHIEF FINANCIAL OFFICER.

Retention of this Award Agreement will be deemed to be acceptance of the option
award evidenced by this Award Agreement. There is no need to return or
countersign this Award Agreement.

Optionee Name:             _______________________________

Option Share Amount:       _______________________________

Option Price:              _______________________________

Date of Grant:             _______________________________

Expiration Date:           _______________________________

Tax Status (check one):    Incentive Stock Option (ISO) ______
                           Non-Qualified Stock Option (NQSO) _______

Vesting Schedule           Date Vested: _______  Number of Shares Vested:_______
                           Date Vested: _______  Number of Shares Vested:_______
                           Date Vested: _______  Number of Shares Vested:_______

<PAGE>

This Award Agreement has been executed on behalf of CAS Medical Systems, Inc. by
the undersigned duly authorized officer.

CAS MEDICAL SYSTEMS, INC.

By: _______________________
Name:
Title:EXHIBIT 10.6(E)
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                                 AMENDMENT NO. 5
                           TO PARTICIPATION AGREEMENT

     This Amendment No. 5 ("Amendment") is executed the date as of each
signature below, but shall be effective as of January 1, 2005, ("Amendment
Effective Date") by and between Penn Virginia Oil & Gas, L.P. successor to Penn
Virginia Oil & Gas Corporation, ("PVOG") and GMX RESOURCES INC. and its wholly
owned subsidiaries, Expedition Natural Resources Inc. and Endeavor Pipeline Inc.
(collectively, "GMX") for purposes of amending the Participation Agreement, as
previously amended, ("Agreement") between the parties with reference to the
following circumstances:

          A. PVOG and GMX (collectively, "Parties" and, individually, a "Party")
     previously entered into Amendment #4 which permitted the use of multiple
     rigs under certain circumstances and provided a mechanism by which PVOG
     would advance the funds to GMX for second wells. Pursuant to Section 2.2.9
     of the Agreement, PVOG terminated the multiple rig provisions on November
     19, 2004, resulting in the reinstatement of Section 2.1 of the Agreement
     that prohibits the drilling of more than one well at the same time.

          B. PVOG and GMX now wish to further amend the Agreement in order to
     provide for the use and sharing of multiple rigs.

     In consideration of the mutual covenants, promises, rights and obligations
contained herein and for other good and valuable consideration, the receipt and
sufficiency of which are hereby acknowledged, the Parties agree as follows:

     1    CAPITALIZED TERMS. 2 Capitalized terms not otherwise defined in this
          Amendment shall have the same meaning as set forth in the Agreement.

     2    SIMULTANEOUS DRILLING. 3 Section 2.2 of the Agreement as added by
          Amendment #4 shall continue to govern the use of multiple rigs during
          the period May 11, 2004 through November 19, 2004. For the period
          beginning on the Amendment Effective Date a new Section 2.3 which
          shall be added to the Agreement shall govern the use of multiple rigs
          which shall read in its entirety as follows:

               "2.3 USE OF MULTIPLE RIGS AFTER JANUARY 1, 2005.

               Notwithstanding the provisions of Section 2.1 that prohibit the
               drilling of more than one well at the same time in Phase I, Part
               B and Phase II, Part B, collectively, the Parties agree that
               after the Amendment Effective Date of Amendment No. 5, drilling
               operations with no more than two rigs may be used in either Phase
               I, Phase II or both subject to the following provisions:

                    2.3.1 SHARING WITH GMX. If PVOG engages an additional rig
                    for drilling in Part B with the concurrence of GMX, PVOG
                    shall: (1) declare one of the drilling rigs to be the
                    "Second Rig" under the terms of the Agreement, as amended,
                    and (2) make

<PAGE>

                    the Second Rig available for use by GMX for drilling
                    operations in Phase III on a one to one basis, i.e. for
                    every well that PVOG uses the Second Rig for drilling
                    operations under the terms of the Agreement, if GMX is
                    ready, able and willing to use the Second Rig, it may make
                    use of the Second Rig for the drilling of one well in Phase
                    III. Five (5) days prior to reaching total depth on the well
                    preceding GMX's option to use the Second Rig, GMX shall: (1)
                    give PVOG written notice of its election to use the second
                    rig and (2) enter into a single well or a multiple well (if
                    GMX has elected to bank locations as provided below)
                    drilling contract with the rig contractor on terms
                    acceptable to both GMX and the rig contractor, which terms
                    shall be no less favorable to GMX than the terms available
                    to PVOG, save and except any financial requirements
                    prescribed by the rig contractor. During the time a rig is
                    used by GMX, PVOG will have no financial or other
                    responsibility to the rig contractor for such utilization.
                    Both PVOG and GMX shall have the right to bank up to three
                    (3) well locations to be drilled with the Second Rig at a
                    later date if either party elects to do so.

               2.3.2 PAYMENTS OF COSTS. If GMX elects to participate in any well
               drilled in Part B of either Phase I or Phase II while multiple
               rigs are being used, it will be responsible for payment of its
               share of costs in accordance with the terms of the Agreement
               based on the size of the election it makes.

               2.3.3 AFES. As long as multiple drilling rigs are being used in
               Phase I and II, PVOG shall not present to GMX more than two AFEs
               per drilling rig utilized in either Phase I or Phase II within
               any fifteen (15) day period for any operations conducted under
               this Section 2.3.

               2.3.4 TERMINATION OF THE USE OF MULTIPLE RIGS. Either Party may
               terminate the multiple rig provisions of this Section 2.3,
               subject to the terms of the drilling contract currently in effect
               for the "Second Rig", at any time by giving at least sixty (60)
               days notice of such termination to the other party in which event
               the provisions of Section 2.1 will be reinstated to prohibit the
               drilling of more than one well at the same time."

     Except as set forth above, the Agreement as previously amended will remain
in full force and effect.

                                        2
<PAGE>

     Executed effective as of the date set forth above.

                              GMX RESOURCES INC.
                              EXPEDITION NATURAL RESOURCES INC.
                              ENDEAVOR PIPELINE INC.

                              By: /s/ Ken L. Kenworthy, Sr.
                                  -------------------------------
                                  Ken L. Kenworthy, Sr.
                                  Executive Vice President of GMX Resources Inc.
                                  President of Expedition Natural Resources Inc.
                                  President of Endeavor Pipeline Inc.

                              Date: 3-2-05
                                    -----------------------------

                              PENN VIRGINIA OIL & GAS, L.P. By: Penn Virginia
                              Oil & Gas GP LLC, its General Partner

                              By: /s/ Scott D. Coe
                                  -------------------------------

                              Date: February 25, 2005
                                    -----------------------------

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