Document:

EXHIBIT 10.18

FIRST AMENDMENT TO
CORE LABORATORIES N.V.
1995 LONG-TERM INCENTIVE PLAN
(As Amended and Restated Effective as of May 29, 1997)

WHEREAS, CORE LABORATORIES N.V.  (the "Company") has heretofore adopted the CORE
LABORATORIES N.V. 1995 LONG-TERM INCENTIVE PLAN (As Amended and Restated
Effective as of May 29, 1997) (the "Plan"); and

WHEREAS, the Company desires to amend the Plan in certain respects;

NOW, THEREFORE, the Plan shall be amended as follows:

1.       The first sentence of Section 4 of the Plan shall be deleted and
         replaced with the following:

         "There shall be available for Awards granted wholly or partly in Common
         Shares (including rights or options which may be exercised for or
         settled in Common Shares) during the term of this Plan an aggregate of
         5,400,000 Common Shares, subject to adjustment as provided in
         Section 14."

2.       This amendment to the Plan set forth in paragraph 1 hereof shall be
         effective as of May 25, 2000, provided that this amendment to the Plan
         is approved by the shareholders of the Company at the 2000 annual
         meeting of the Company's shareholders.

3.       As amended hereby, the Plan is specifically ratified and reaffirmed.EXHIBIT 10.19

                              SECOND AMENDMENT TO
                             CORE LABORATORIES N.V.
                  1995 NONEMPLOYEE DIRECTOR STOCK OPTION PLAN
             (As Amended and Restated Effective as of May 29, 1997)

WHEREAS, CORE LABORATORIES N.V.  (the "Company") has heretofore adopted the CORE
LABORATORIES N.V. 1995 NONEMPLOYEE DIRECTOR STOCK OPTION PLAN (As Amended and
Restated Effective as of May 29, 1997) (the "Plan"); and

WHEREAS, the Company desires to amend the Plan in certain respects;

NOW, THEREFORE, the Plan shall be amended as follows:

1.       The first sentence of Paragraph 5 of the Plan shall be deleted and
         replaced with the following:

         "Subject to adjustment as provided in Paragraph 10 hereof, a total of
         700,000 Common Shares shall be reserved for issuance upon the exercise
         of Options granted pursuant to this Plan."

2.       This amendment to the Plan set forth in paragraph 1 hereof shall be
         effective as of May 25, 2000, provided that this amendment to the Plan
         is approved by the shareholders of the Company at the 2000 annual
         meeting of the Company's shareholders.

3.       As amended hereby, the Plan is specifically ratified and reaffirmed.PROMISSORY NOTE

$300,000.00                                                   RICHMOND, VIRGINIA
                                                               FEBRUARY 28, 2001

FOR VALUE RECEIVED,  Apple  Hospitality  Two, Inc., a Virginia  corporation (the
"Maker"),  hereby  makes an  UNCONDITIONAL  PROMISE TO PAY TO THE ORDER OF APPLE
SUITES,  INC., a Virginia  corporation  (the  "Holder"),  in lawful money of the
United States of America, the principal sum of Three Hundred Thousand and 00/100
Dollars ($300,000.00),  or such amount thereof as has been advanced from time to
time and not repaid,  together with  interest  thereon,  in accordance  with the
following terms:

1.       INTEREST.

         Interest  shall  accrue on the unpaid  principal  balance at the annual
rate of eight and one-half  percent (8 1/2 %) (the "Note Rate").  If there is an
Event of Default (as defined below),  the annual rate of interest shall increase
to twelve percent (12%),  and shall be compounded  monthly (the "Default Rate").
The date any payment is due under this Note is called a "Payment Date."

2.       PAYMENTS.

         (a) The debt  represented  by this  Note  shall be due,  in whole or in
part,  on written  demand by the Holder to the Maker,  at any time after  ninety
(90) days have elapsed from the first advance evidenced by this Note.

         (b) The Maker is entitled to prepay the  principal  balance  under this
Note,  in whole or in  part,  on one or more  occasion(s),  without  premium  or
penalty.

         (c) The Holder shall have the right to allocate all payments under this
Note in accordance with the following priority: (1) first, to accrued but unpaid
interest; and (2) second, to unpaid principal.

3.       PAYMENT ADDRESS AND METHOD.

         The Holder shall have the right,  which may be exercised on one or more
occasion(s)  in the sole  discretion of the Holder,  to require the Maker to use
any address for the  delivery of payment and any  reasonable  method of payment,
including  but not  limited to  cashier's  check or wire  transfer.  For present
purposes,  the Holder  hereby  requires the Maker to use a single check for each
payment,  and to use the mailing  address  shown  below for the  delivery of all
payments:

                              Apple Suites, Inc.
                              Attn: Stanley J. Olander, Jr., Secretary
                              9 North Third Street
                              Richmond, VA 23219

<PAGE>

4.       SECURITY AND COLLATERAL.

         The  Holder  and the  Maker  acknowledge  and  agree  that no  security
interest has been granted in any property or collateral in connection  with this
Note except that Glade M. Knight has provided a certain  Guaranty  pertaining to
the debt evidenced by this Note.

5.       PURPOSE.

         The Maker has received  funds or will receive funds from the Holder for
general  corporate  purposes  of the Maker.  This Note serves as evidence of the
indebtedness of the Maker to the Holder,  and provides for the repayment of such
indebtedness  to the Holder.  The Holder agrees to make advances under this Note
(in a cumulative  amount up to the  principal  amount  stated at the top of this
Note) from time to time on reasonable  notice from the Maker so long as there is
not then,  and never has been, an Event of Default (as defined below) under this
Note.

6.       EVENTS OF DEFAULT.

         (a)      Each of the  following  events shall  constitute  an "Event of
Default" under this Note:

                  (1) the Maker's  failure to pay to the Holder,  within a grace
period of five (5) calendar days after any Payment Date,  the full amount due on
such Payment Date;

                  (2)  the   commencement  of  any  proceeding  to  appoint  any
receiver, trustee, custodian,  liquidator, or similar official for the Maker, or
the final appointment of any of the foregoing;

                  (3) the entry of any judgment  against the Maker that exceeds,
when combined with its other unpaid judgments,  thirty percent (30%) of the then
unpaid principal balance under this Note;

                  (4) the  general  inability  of the  Maker to pay its debts as
they become due;

                  (5) the filing or commencement, by the creditors of the Maker,
of any Insolvency  Action (as defined below) that is not dismissed within thirty
(30) calendar days after the original date of filing or commencement;

                  (6) the approval or voluntary filing of any Insolvency Action,
or the approval or consummation of any plan to make a general assignment for the
benefit of creditors, by the Maker;

                  (7)  the  approval  of  any  plan,  or  the  execution  of any
contract,  that causes or is intended to cause any of the following with respect
to the Maker:  (A) its dissolution;  (B) the liquidation of its assets;  (C) the
termination of its corporate existence,  whether by merger or otherwise;  or (D)
the sale or transfer of all, or substantially all, of its assets;

                  (8) any event that causes or will cause the Maker to cease its
business  or  operations  for a period  of more  than  thirty  (30)  consecutive
calendar days; or

                  (9) any event that  terminates or will terminate the business,
operations or legal existence of the Maker.

         (b) For purposes of this Note, the term "Insolvency  Action" shall mean
any case or  proceeding,  or petition  relating  thereto,  that arises under any
state or Federal laws relating to bankruptcy or insolvency, whether now existing
or subsequently  enacted,  and that seeks  reorganization,  liquidation or other
relief with respect to the debts, assets or businesses of the Maker.

                                      -2-
<PAGE>

7.       REMEDIES.

         (a) If an Event of Default  occurs,  all unpaid  principal  and accrued
interest  under  this Note shall  become  immediately  due and  payable in full,
without any action whatsoever by the Holder.

         (b) The  Maker  shall  pay all  costs,  including  but not  limited  to
reasonable  legal  fees and  expenses,  whether  arising in  connection  with an
Insolvency  Action or  otherwise,  that may be incurred by the Holder to enforce
this Note or to collect the amounts due under this Note  ("Enforcement  Costs").
The Holder,  in its sole discretion,  shall have the right to treat  Enforcement
Costs as additional interest under this Note.

8.       TRANSFER AND ASSIGNMENT.

         (a) The Holder shall have the right to transfer this Note and to assign
any rights or remedies under this Note.  Such right may be exercised in whole or
in part, on one or more occasion(s),  in the sole discretion of the Holder.  The
obligations of the Maker under this Note shall not be altered or affected in any
way by any such transfer or assignment by the Holder.

         (b) The Maker shall be absolutely  prohibited from assigning any of its
obligations under this Note without the prior written consent of the Holder. The
Holder shall be entitled to withhold such consent in its sole discretion for any
reason or no reason.  Any attempted  assignment in violation of such prohibition
shall be ineffective and void.

9.       WAIVERS.

         (a) The Holder  shall not be deemed to have waived any of its rights or
remedies  under this Note  unless the  Holder  delivers a written  notice to the
Maker that  states the nature and scope of such  waiver.  Without  limiting  the
foregoing, no waiver of the Holder's rights or remedies shall be deemed to exist
solely  because the Holder,  on one or more  occasion(s),  may have:  (1) waived
certain  rights or remedies;  (2) elected  certain rights or remedies in lieu of
others;  (3) delayed in  exercising  any rights or  remedies;  (4)  extended any
Payment Dates under this Note; or (5) refrained  from requiring the Maker to act
in strict compliance with this Note.

         (b) The Maker, to the maximum extent  permitted by law, hereby grants a
complete, irrevocable and unconditional waiver of each of the following: (1) the
right to require presentment,  demand,  dishonor,  protest or any notices of any
kind or nature  from the  Holder in  connection  with  this Note  (other  than a
written  demand for payment as  described in Section 2); (2) the right to assert
any statute of limitations as a defense to the enforcement of this Note; (3) any
claim that seeks to restrain,  enjoin,  prohibit,  delay or  interfere  with any
transfer of this Note by the Holder, or any assignment of the Holder's rights or
remedies  under this Note;  (4) any claim that a transfer or  assignment  by the
Holder with respect to this Note has altered or affected the  obligations of the
Maker in any way;  and (5) any claim  that the  Holder  has waived its rights or
remedies  under  this  Note in a manner  other  than  the  manner  described  in
subsection (a) immediately above.

                                      -3-
<PAGE>

10.      General.

         (a) Time is of the essence  with  respect to this Note and each Payment
Date.  Except as expressly set forth in this Note,  or in a written  waiver that
may be granted by the Holder,  there are no grace  periods and no  extensions of
time for payment with respect to this Note,  and no grace  periods or extensions
shall be implied.

         (b) This Note shall be interpreted  and enforced in accordance with the
laws of the  Commonwealth  of  Virginia,  without  regard  to any  choice of law
provisions or principles thereof to the contrary.

         (c) All  provisions  in this  Note are  severable  and each  valid  and
enforceable  provision shall remain in full force and effect,  regardless of any
official or formal  determination  that declares certain provisions of this Note
to be invalid or unenforceable.

         (d) Captions and  headings are used in this Note for  convenience  only
and shall not affect the  interpretation  of this Note.  Terms such as "hereof,"
"hereby,"  "hereto,"  "herein" and "hereunder"  shall be deemed to refer to this
Note as a whole, rather than to any particular provision of this Note.

         (e) All terms and  conditions of this Note shall be binding  upon,  and
enforceable  against,  the  Holder and the  Maker,  and all of their  respective
assignees and successors in title or interest.

                                            APPLE HOSPITALITY TWO, INC.,
                                            a Virginia corporation

                                            By: /s/ Glade M. Knight
                                               ---------------------------------
                                                  Glade M. Knight, President

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