Filed by: Dorchester Minerals, L.P.
                           Pursuant to Rule 425 under the Securities Act of 1933
                                     and deemed filed pursuant to Rule 14a-12(b)
                                          of the Securities Exchange Act of 1934
                                                   Commission File No. 333-88282
                                      Subject Company: Dorchester Minerals, L.P.

     The  following  is a proposed  amendment  letter  delivered  by the general
partners of Republic  Royalty Company to the Republic ORRI owners on January 21,
2003  relating to proposed  amendments  to certain  combination  documents.  The
proposed amendment letter is not final and is subject to further discussons with
the Republic ORRI Owners.


                                January ___, 2003


To the Republic ORRI Owners and the
Limited Partners of Dorchester Hugoton, Ltd.
and Spinnaker Royalty Company, L.P.

     In connection with the proposed  combination of the business and properties
of Dorchester  Hugoton,  Ltd.  ("DHL"),  Republic Royalty Company  ("RRC"),  and
Spinnaker  Royalty  Company,  L.P. ("SRC") into Dorchester  Minerals,  L.P. (the
"Partnership")  pursuant to that certain Combination  Agreement,  dated December
13, 2001,  as amended (the  "Combination  Agreement"),  among DHL, RRC, SRC, the
Partnership,   Dorchester   Minerals  Management  LP  (the  "General  Partner"),
Dorchester  Minerals  Management  GP LLC (the  "Management  GP") and  Dorchester
Minerals Operating LP, and the Contribution  Agreement,  dated December 13, 2001
(the  "Contribution  Agreement"),  the undersigned hereby agree to the following
matters.  Capitalized terms used herein but not otherwise defined shall have the
meanings attributed to them in the applicable document in which context they are
used.

Amended and Restated Partnership Agreement

     The  Combination  Agreement  is  amended to provide  that the  Amended  and
Restated Agreement of Limited Partnership of the Partnership,  the form of which
is  attached  as Exhibit  1.2 to the  Combination  Agreement  (the  "Partnership
Agreement"), is amended to provide for the following:

     The General  Partner  shall be under a  fiduciary  duty and  obligation  to
     conduct  the  affairs of the  Partnership  in a manner  that it  reasonably
     believes to be in, or not  inconsistent  with,  the best  interests  of the
     Partnership and the Limited Partners.  The foregoing  statement is intended
     to modify  Section  7.9(b) of the  Partnership  Agreement as to the General
     Partner and its Affiliates other than the members of the Advisory Committee
     and non-manager officers of Affiliates of the General Partner.

     Notwithstanding any provision to the contrary in the Partnership  Agreement
     (including  Sections  7.5, 7.6 and 7.9),  whenever a potential  conflict of
     interest  exists  or  arises  between  the  General  Partner  or any of its
     Affiliates, on the one hand, and the Partnership

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     or any of its  Partners,  on the other,  the General  Partner in connection
     with its  resolution of such conflict is required to seek Special  Approval
     of such resolution.  Further,  the General Partner shall not be entitled to
     use its "sole  discretion"  (as defined in the  Partnership  Agreement)  in
     determining whether a potential conflict of interest exists.

     Notwithstanding any provision to the contrary in the Partnership  Agreement
     (including Section  7.1(a)(i)),  to the extent necessary to avoid unrelated
     business  taxable income,  the General Partner is prohibited from incurring
     indebtedness  (i) in excess  of  $50,000  or (ii)  which  would  constitute
     "acquisition  indebtedness"  (as  defined  in Section  514 of the  Internal
     Revenue Code of 1986, as amended).

     Notwithstanding any provision to the contrary in the Partnership  Agreement
     (including  Section  7.1(a)(xiii)),   to  the  extent  necessary  to  avoid
     unrelated  business taxable income, the General Partner shall not cause the
     Partnership to acquire working  interests or cost bearing  interests in any
     oil and gas leases or similar  assets.  In the event that any of the assets
     of the Partnership become working interests or cost bearing interests,  the
     General  Partner  shall cause such  assets to be assigned to the  Operating
     Subsidiary in accordance with the Royalty/NPI Agreement.

     The definition of "Available  Cash" is amended to (i) delete the phrase "in
     the  reasonable  discretion  of the General  Partner" and (ii) provide that
     cash reserves for acquisitions may only be excluded from the calculation of
     Available Cash to the extent such acquisitions are the subject of a binding
     agreement or a non-binding  letter of intent.  Further,  Section  7.9(b) is
     amended to delete the next to last sentence.

     Notwithstanding any provision to the contrary in the Partnership  Agreement
     (including  Sections  5.7 and  7.3(c)),  in the event that the  Partnership
     acquires  properties for a combination of cash and  Partnership  Interests,
     (i) the cash component of the acquisition  consideration  shall be equal to
     or less than 5% of the aggregate cash distributions made by the Partnership
     for the four  most  recent  Quarters  and (ii) the  amount  of  Partnership
     Interests,  after giving effect to such  issuance,  shall not exceed 10% of
     the outstanding Limited Partnership Interests.

     Notwithstanding any provision to the contrary in the Partnership  Agreement
     (including Section 5.6(a)),  the Partnership is prohibited from issuing any
     Partnership Securities, and any options, rights, warrants, and appreciation
     rights relating to Partnership Securities,  having greater rights or powers
     than the common units of the Partnership,  unless such issuance is approved
     by a Unit Majority.

     Notwithstanding anything to the contrary in Article XIII of the Partnership
     Agreement, the Partnership shall, beginning in 2004, hold an annual meeting
     of limited  partners  of the  Partnership.  In  connection  with the annual
     meeting,  (i) the members of the  Advisory  Committee  will be elected by a
     plurality of the votes of the  Outstanding  Limited  Partnership  Interests
     present at the  meeting in person or by proxy and  entitled  to vote in the
     election and (ii) such other  business  will be  transacted  as is properly
     brought  before the meeting.  Members of  Management GP who in the original
     form of Limited  Liability  Company Agreement of Management GP, attached as
     Exhibit A to the  Contribution

<page>

     Agreement (the "Management GP Agreement"), had the right to appoint persons
     to serve as members of the Advisory  Committee  (i) shall have the right to
     appoint  persons to serve as members of the  Advisory  Committee  until the
     Partnership's  2004 annual  meeting of limited  partners and (ii) beginning
     with the 2004 annual meeting of limited  partners,  shall have the right to
     cause the General  Partner to nominate  persons for  election as members of
     the Advisory  Committee in accordance with the Management GP Agreement.  In
     addition,  limited partners may nominate additional persons for election as
     a member of the Advisory Committee in accordance with the procedures as set
     forth in Exhibit A attached hereto. The Partnership Agreement is amended to
     include the provisions contained in Exhibit A.

     The  definition  of  "Outstanding"  is  amended  to mean  "with  respect to
     Partnership  Securities,  all Partnership Securities that are issued by the
     Partnership  and reflected as  outstanding on the  Partnership's  books and
     records as of the date of determination."

     Notwithstanding  anything to the contrary in newly renumbered Section 13.5,
     special  meetings  of the  Limited  Partners  may be called by the  General
     Partner  or by  Limited  Partners  owning  20% or more  of the  Outstanding
     Limited  Partner  Interests  of the class or classes for which a meeting is
     proposed, provided that the Limited Partners shall only be entitled to call
     one special meeting every 12 months. Section 13.5, as newly renumbered,  is
     amended to include the provisions contained in Exhibit A.

     Section  7.12(b)  is amended to  provide  that the  General  Partner or its
     Affiliates  have the right to "piggyback" on a registration  requested by a
     holder,  other  than the  General  Partner  and its  Affiliates,  of demand
     registration  rights,   provided  that  the  party  exercising  the  demand
     registration  may,  at any time,  abandon  or delay  any such  registration
     initiated by it.

Transfer Restriction Agreement

     The  Contribution  Agreement  is amended to provide  that Article IV of the
Transfer  Restriction  Agreement,  the form of which is attached as Exhibit C to
the Contribution  Agreement, is amended to provide that permitted sales to third
parties,  subject to a right of first refusal, may not be made prior to December
31, 2010.

Lock-Up Agreement of William Casey McManemin

     The Combination  Agreement is amended to provide that as a condition to the
obligation  of the  parties  to the  Combination  Agreement  to  consummate  the
combination,  the  Partnership  and William  Casey  McManemin  will enter into a
lock-up agreement that prohibits the Disposition of any of the Securities, owned
at the time of execution of the lock-up  agreement by Mr. McManemin  directly or
with  respect  to  which  Mr.  McManemin  has  an  economic  interest  ("Covered
Securities") until the second anniversary of the closing of the combination. The
lock-up  agreement  shall expire as to 25% of the initial  amount of the Covered
Securities  upon each of the  second,  third  and  fourth  anniversaries  of the
closing of the  combination,  such that following the fourth  anniversary of the
closing of the combination,  Mr. McManemin is permitted to sell up to 75% of the
initial amount of the Covered Securities, which restriction shall continue until
such

<page>

time as Mr. McManemin ceases to be a manager of Management GP. In no event shall
the lock-up agreement cover securities which Mr. McManemin beneficially owns, or
is  deemed  to  beneficially  own,  but in which  he does  not have an  economic
interest. The prohibition on a Disposition of Covered Securities will be subject
to exceptions  for bona fide gifts,  family  transfers,  and transfers  with the
consent of the Advisory Committee.

Operating Subsidiary Limited Partnership Agreement

     The Agreement of Limited  Partnership  of the Operating  Subsidiary,  dated
December 12, 2001,  is amended to provide that the  Partnership  may not sell or
transfer any working  interests  owned by it and which  underlie the  overriding
royalty  interests in such properties  held by the  Partnership  (the "Operating
ORRIs"),   unless  the  related   Operating   ORRIs  are  sold  or   transferred
simultaneously at corresponding prices.

Amended and Restated LLC Agreement of Management GP

     The  Contribution  Agreement  is amended to provide that Section 8.2 of the
Management GP Agreement is amended to provide that the Appointment  Rights shall
consist of (i) the right to appoint  persons to serve as members of the Advisory
Committee until the  Partnership's  2004 annual meeting of limited  partners and
(ii) beginning with the 2004 annual  meeting of limited  partners,  the right to
cause the  General  Partner to nominate  persons for  election as members of the
Advisory  Committee in accordance with the Management GP Agreement and that such
nominees  will  be  elected  by  the  limited  partners  of the  Partnership  in
accordance with the Partnership Agreement of the Partnership.

Business Opportunities Agreement

     Section 3 of the Business Opportunities Agreement, dated December 13, 2001,
is amended to provide  that (i) "Oil and Gas  Interests"  shall mean oil and gas
interests,  including but not limited to, (a) oil and gas net profits interests,
(b) royalty  interests  and other  mineral  interests and (c) to the extent such
interests  are within the  geographic  boundaries of any lease,  tract,  unit or
parcel of land then owned by the Partnership or in which the Partnership at that
time has an interest,  working interests or other cost bearing  interests;  (ii)
the threshold  purchase price of a Qualifying  Acquisition  Opportunity shall be
greater than three percent (3%) of the Market Capitalization of the Partnership;
(iii) beginning on the date of the Partnership's  2004 annual meeting of limited
partners,  a Manager of  Management  GP that is also an Affiliate or employee of
(a)  the GP  Parties  or  any  Subsidiary  thereof  or (b)  any  Officer  or any
Subsidiary thereof shall also be subject to the obligations  provided in Section
3 and such obligations on such Manager will apply to all  opportunities  without
regard to the amount of the  purchase  price and (iv) that the  Notifying  Party
must provide  written  notice to the  Partnership  at least 21 days prior to the
consummation of the transactions contemplated by the Purchase Agreement.

Indemnity Agreement

     The Combination  Agreement is amended to delete Section 11.18,  which would
have required that the Partnership and an affiliate of Republic Royalty Company,
LP enter into an indemnity agreement in connection with certain litigation.

<page>

Registration Rights Agreement

     The proposed  Registration  Rights  Agreement among the Partnership and the
Republic ORRI owners (the "Registration Rights Agreement") is amended to provide
for the following (the specific  provisions of the Registration Rights Agreement
being amended are shown in parentheses below):

     "Best Efforts" is defined as "a Person's  reasonable  best efforts  without
     the incurrence of unreasonable expense" (Section 1).

     The  Partnership  will bear all  expenses  arising from a  registration  of
     securities  pursuant  to the  Registration  Rights  Agreement,  other  than
     underwriting discounts and commissions (Section 4).

     The  holders  of  Registrable  Securities  are  entitled  to 3  demand  and
     unlimited piggyback  registrations,  but will not be entitled to a Form S-3
     shelf registration (Section 2).

     The holders of Registrable  Securities are entitled to "piggyback" (i) on a
     registration by the Partnership for an offering of equity securities of the
     Partnership for cash (other than an offering relating solely to an employee
     benefit plan) and (ii) on a registration  requested by the General  Partner
     and its Affiliates  pursuant to demand registration  rights,  provided that
     the party exercising the demand  registration may, at any time,  abandon or
     delay any such registration  initiated by it. If the proposed offering upon
     which the holders of Registrable Securities exercise their piggyback rights
     shall be an  underwritten  offering,  then,  in the event that the managing
     underwriter  or  managing   underwriters   of  such  offering   advise  the
     Partnership  and the  Holders  electing  to  exercise  piggyback  rights in
     writing that in their opinion the inclusion of all or some of such Holder's
     Partnership Securities would adversely and materially affect the success of
     the  offering,  the  Partnership  shall  include in such offering only that
     number or amount,  if any, of securities  held by such Holder which, in the
     opinion of the managing underwriter or managing  underwriters,  will not so
     adversely and materially affect the offering.

     The Partnership  will cause a demand  registration to remain  effective for
     180 days, unless all securities covered by such registration have been sold
     (Section 2.1(a)(ii).

     The  Partnership  may  postpone  a  demand  registration  90  days  if such
     postponement  is in the best interests of the  Partnership and its partners
     due a pending transaction, investigation or event (Section 2).

     In the event a demand registration involves an underwritten  offering,  the
     underwriter(s)  shall be selected by the Holders and reasonably  acceptable
     to the Partnership (Section 2.1(d)).

     Registration  rights will not terminate until the later of (i) December 31,
     2010,  (ii) 2 years  following the withdrawal of the General Partner as the
     general partner of the Partnership

<page>

     or (iii) the  termination  of  registration  rights  granted to the General
     Partner and its affiliates (Section 2.3).

     The Partnership  represents and covenants that any  registration  statement
     covering sales by a Holder pursuant to the  Registration  Rights  Agreement
     will not contain material misstatements or omissions.

     The  obligation of the  Partnership  to amend or supplement a prospectus to
     keep a registration  statement available for use may be suspended for up to
     30 consecutive and 60  non-consecutive  days if the amendment or supplement
     would require the disclosure of information that the Partnership has a bona
     fide business purpose for keeping confidential (Section 3(b)).

     The Holders will agree to market-standoff for a period of 180 days from the
     date of request to standoff (Section 5(a)).

     Holders will not be required to  indemnify,  provide  contribution  to, the
     Partnership for losses arising from the registration of securities pursuant
     to the Registration Rights Agreement (Section 6(b) and Section 6(d)).

     Each Holder represents and covenants that any information  provided by such
     Holder with respect to a registration  pursuant to the Registration  Rights
     Agreement will not contain  material  misstatements  or omissions  (Section
     6(b)).

     Each Holder may assign or subdivide its rights pursuant to the Registration
     Rights  Agreement  directly to no more than 2 Persons without prior written
     consent of the Partnership (Section 8).

     The  Partnership  agrees to enter into customary  underwriting  agreements,
     cooperate in any due diligence  conducted by  underwriters,  and deliver or
     cause to be  delivered  to the Holders and the  underwriters,  if any,  any
     certificates, opinions or comfort letters customarily required.

     The  Partnership  agrees to  facilitate  the  delivery  of the  Registrable
     Securities  upon any sale by a Holder pursuant to the  Registration  Rights
     Agreement.

     The undersigned  parties agree that the foregoing will be effective for all
purposes under the Combination Agreement and the agreements  contemplated by it.
The undersigned  parties shall amend and restate the documents referred to above
that have previously been executed and will revise such documents that are to be
executed at closing,  each in a manner consistent with the foregoing,  and shall
execute such documents as amended and restated or revised, as applicable, at the
closing of the combination transaction.


                    [SIGNATURES APPEAR ON THE FOLLOWING PAGE]
<page>

     Each of the  undersigned  parties  has caused this letter to be executed on
its behalf by its representative  thereunto duly authorized,  all as of the date
first above written.


                                DORCHESTER HUGOTON, LTD.

                                By: P.A. Peak, Inc., General Partner

                                    By:____________________________

                                By: James E. Raley, Inc., General Partner

                                    By:____________________________



                                REPUBLIC ROYALTY COMPANY

                                By: SAM Partners, Ltd., General Partner

                                     By: SAM Partners, Inc., General Partner

                                         By:_______________________


                                By: Vaughn Petroleum, Ltd., General Partner

                                    By: VPL(GP), LLC, General Partner

                                        By:________________________



                                SPINNAKER ROYALTY COMPANY, L.P.

                                By: Smith Allen Oil & Gas, Inc., General Partner

                                    By:____________________________

<page>
                                DORCHESTER MINERALS, L.P.

                                By: Dorchester Minerals Management LP,
                                    General Partner

                                    By: Dorchester Minerals Management GP LLC,
                                        General Partner

                                        By:________________________



                                DORCHESTER MINERALS MANAGEMENT LP

                                By: Dorchester Minerals Management GP LLC,
                                    General Partner

                                    By:____________________________



                                DORCHESTER MINERALS MANAGEMENT GP LLC

                                By:________________________________



                                DORCHESTER MINERALS OPERATING LP

                                By: Dorchester Minerals Operating GP LLC,
                                    General Partner

                                     By:___________________________



                                DORCHESTER MINERALS OPERATING GP LLC

                                By:________________________________



                                P.A. PEAK, INC.

                                By:________________________________



                                JAMES E. RALEY, INC.

                                By:________________________________



                                SAM PARTNERS, LTD.

                                By: SAM Partners, Inc., General Partner

                                    By:____________________________



                                VAUGHN PETROLEUM, LTD.

                                By: VPL(GP), LLC, General Partner

                                    By:____________________________



                                SMITH ALLEN OIL & GAS, INC.

                                By:________________________________



                                ___________________________________
                                William Casey McManemin



                                ___________________________________
                                H.C. Allen, Jr.



                                ___________________________________
                                James E. Raley



<page>
                                    EXHIBIT A

     The  following  shall be inserted as a new Section 13.4 of the  Partnership
Agreement and the subsequent sections shall be renumbered.

SECTION 13.4.     Annual Meetings.

     (a) Beginning in 2004, an annual meeting of Limited  Partners shall be held
for  the  election  of the  members  of the  Advisory  Committee,  on the  first
Wednesday of May if not a legal holiday, and if a legal holiday then on the next
business  day  following,  at  10:00  a.m.,  or at such  date and time as may be
designated  by  resolution of the Board of Managers from time to time and stated
in the notice of the meeting, at which the Limited Partners shall by a plurality
elect the members of the Advisory  Committee and to transact such other business
as is properly  brought  before the meeting in accordance  with this  Agreement.
Annual meetings of Limited  Partners shall be held at such place,  either within
or without the State of Delaware,  as shall be  designated  from time to time by
the Board of Managers and stated in the notice of the meeting. Written notice of
the annual  meeting  stating the place,  date and hour of the  meeting  shall be
given to each Limited Partner entitled to vote at such meeting not less than ten
(10) nor more than sixty (60) days before the date of the meeting.

     (b) To be  properly  brought  before an annual  meeting,  business  must be
either (i) specified in the notice of meeting (or any supplement  thereto) given
by or at the direction of the Board of Managers, (ii) otherwise properly brought
before the meeting by or at the  direction  of the Board of  Managers,  or (iii)
otherwise  (A) be  properly  requested  to be brought  before  the  meeting by a
Limited Partner of record entitled to vote in the election of the members of the
Advisory  Committee  generally and (B) constitute a proper subject to be brought
before the  meeting.  In order for  business  (other  than the  election  of the
members of the  Advisory  Committee)  to be properly  brought  before the annual
meeting of Limited Partners by a Limited  Partner,  the business must be legally
proper, and written notice of such Limited Partner's intent to bring such matter
before the  annual  meeting of Limited  Partners  must be  delivered,  either by
personal  delivery or by United  States mail,  postage  prepaid,  to the General
Partner of the Partnership.  Such notice must be received by the General Partner
not later than 60 days in advance of such  meeting if such meeting is to be held
on a day which is within  30 days  preceding  the  anniversary  of the  previous
year's annual meeting,  or 90 days in advance of such meeting if such meeting is
to be held on or after the anniversary of the previous year's annual meeting.  A
Limited  Partner's  notice  to the  General  Partner  shall set forth as to each
matter the  Limited  Partner  proposes  to bring  before  the annual  meeting of
Limited Partners:  (i) a brief description of the business desired to be brought
before the meeting and the reasons for conducting  such business at the meeting,
(ii) the name and address,  as they appear on the  Partnership's  books,  of the
Limited Partner  proposing such business,  (iii) the class and number of Limited
Partnership Interests of the Partnership which are owned by such Limited Partner
and (iv) any  material  interest of the  Limited  Partner in such  business.  No
business  brought by a Limited  Partner shall be conducted at the annual meeting
of Limited  Partners  except in accordance with the procedures set forth in this
Section  13.4(b).  The filing of a Limited  Partner  notice as  required by this
Section  13.4(b)  shall not, in and of itself,  constitute  the  bringing of the
business  described  therein  before the annual  meeting.  The  chairman  of the
meeting shall, if the facts warrant, determine that (1) the business proposed to
be brought before the meeting is not a proper subject  therefor  and/or (2) such
business  was not properly  brought  before the meeting in  accordance  with the
provisions  hereof,  and if he  should so  determine,  he shall  declare  to the
meeting that (1) the business proposed to be brought before the meeting is not a
proper subject thereof and/or (2) such business was not properly  brought before
the meeting and shall not be transacted.

     (c) Nominations  for the election of the members of the Advisory  Committee
shall be made by the  General  Partner  and may be made by any  Limited  Partner
entitled to vote for the election of the members of the Advisory Committee.  Any
Limited Partner entitled to vote for the election of the members of the Advisory
Committee  at a meeting  (i.e.,  any  Limited  Partner of record)  may  nominate
persons  for  election  as a member of the  Advisory  Committee  only if written
notice of such Limited Partner's intent to make such nomination is given, either
by personal delivery or by United States mail,  postage prepaid,  to the General
Partner of the  Partnership  not later 90 days in advance of such meeting.  Each
such notice shall set forth: (1) the name and address of the Limited Partner who
intends to make the nomination of the person or persons to be nominated; (2) the
name of the person or persons to be  nominated;  (3) a  representation  that the
Limited  Partner is a holder of record of Limited  Partnership  Interests of the
Partnership  entitled to vote at such meeting and intends to appear in person or
by proxy at the  meeting to  nominate  the person or  persons  specified  in the
notice;  (4) a description of all  arrangements  or  understandings  between the
Limited  Partner and each nominee and any other  person or persons  (naming such
person or persons)  pursuant to which the  nomination or  nominations  are to be
made by the Limited Partner;  (5) such other information  regarding each nominee
proposed by such Limited Partner as would have been required to be included in a
proxy statement filed pursuant to the proxy rules of the Securities and Exchange
Commission had each nominee been nominated,  or intended to be nominated, by the
General  Partner;  and (6) the  written  consent  of each  nominee to serve as a
member of the Advisory Committee if so elected.  The filing of a Limited Partner
notice  as  required  by this  Section  13.4(c)  shall  not,  in and of  itself,
constitute the making of the nomination(s)  described  therein.  The chairman of
the meeting may refuse to  acknowledge  the nomination of any person not made in
compliance with the foregoing procedure.

     (d) Newly created  memberships on the Advisory Committee resulting from any
increase in the  authorized  number of members of the Advisory  Committee may be
filled by the General Partner in accordance with the limited  liability  company
agreement  of its  general  partner.  In the event of a vacancy on the  Advisory
Committee,  the member of the general  partner of the General  Partner that held
the  appointment  or  nomination  right,  as  applicable,  with  respect to such
vacating member shall have the right,  pursuant to the limited liability company
agreement of the general partner of the General Partner, to nominate,  and cause
the General Partner to appoint, a replacement member of the Advisory  Committee.
A member of the Advisory Committee  appointed to fill a newly created membership
or a vacancy in accordance  with the foregoing shall serve until the next annual
meeting of limited partners.

     (e) In addition to any other applicable requirements, for a Limited Partner
proposal to be considered for inclusion in the Partnership's proxy statement for
the  annual  meeting,  the  Limited  Partner  must  have  satisfied  all  of the
conditions  set forth in Rule 14a-8  promulgated  by the Securities and Exchange
Commission under the Securities  Exchange Act of 1934, as amended (the "Exchange
Act"), or any successor rule thereto (the "Proxy Rules"), including particularly
the  requirement  that the Limited  Partner  give timely  written  notice of the
proposal to the Partnership.

The following shall be inserted into Section 13.10, as renumbered.

     Members of the  Advisory  Committee  shall be elected by a plurality of the
votes of the Outstanding  Limited Interests present in person or by proxy at the
meeting  and  entitled to vote on the  election  of the members of the  Advisory
Committee.

The following shall be inserted into Section 13.5, as renumbered.

     A Limited  Partner's  request to the General  Partner shall set forth as to
each matter the Limited Partner  proposes to bring before the special meeting of
Limited Partners:  (i) a brief description of the business desired to be brought
before the meeting and the reasons for conducting  such business at the meeting,
(ii) the name and address,  as they appear on the  Partnership's  books,  of the
Limited Partner  proposing such business,  (iii) the class and number of Limited
Partnership Interests of the Partnership which are owned by such Limited Partner
and (iv) any  material  interest of the  Limited  Partner in such  business.  No
business  brought by a Limited  Partner shall be conducted at the annual meeting
of Limited  Partners  except in accordance with the procedures set forth in this
Section 13.5.  Notwithstanding  anything to the contrary,  the Limited  Partners
shall only be entitled to call one special meeting every twelve (12) months.

The following shall be inserted into Section 13.11, as renumbered.

     Notwithstanding  anything in this  Agreement to the  contrary,  no business
shall be conducted at a meeting  except in accordance  with the  procedures  and
conditions  set  forth in this  Article  XIII,  and the Proxy  Rules;  provided,
however, that nothing in this Article XIII or the Proxy Rules shall be deemed to
preclude  discussion  of any business  properly  brought  before a meeting.  The
chairman of the meeting shall,  if the facts  warrant,  determine and declare to
the  meeting  that  business  was not  properly  brought  before the  meeting in
accordance  with the  provisions  of this  Article  XIII,  and if he  should  so
determine, he shall so declare to the meeting and any such business not properly
brought before the meeting shall not be transacted.


     THE FOREGOING DOES NOT CONSTITUTE AN OFFER TO BUY, OR THE  SOLICITATION  OF
AN OFFER TO BUY, ANY SECURITIES. THE SECURITIES TO BE OFFERED IN CONNECTION WITH
THE PROPOSED  TRANSACTION  WILL BE OFFERED ONLY  PURSUANT TO A  PROSPECTUS/PROXY
STATEMENT INCLUDED IN A REGISTRATION STATEMENT FILED UNDER THE SECURITIES ACT OF
1933, AS AMENDED.

     ALL PARTNERS OF DORCHESTER  HUGOTON,  REPUBLIC AND SPINNAKER ARE ADVISED TO
READ THE PROSPECTUS/PROXY  STATEMENT,  AND SUPPLEMENTS  THERETO,  FILED WITH THE
SECURITIES AND EXCHANGE COMMISSION AND THE RELATED  SOLICITATION/RECOMMENDATIONS
THAT WILL BE PROVIDED TO EACH PARTNER  REQUESTING SUCH PARTNER'S  VOTE,  BECAUSE
THESE   DOCUMENTS   WILL   CONTAIN   IMPORTANT   INFORMATION.   A  COPY  OF  THE
PROSPECTUS/PROXY STATEMENT AND RELATED  SOLICITATION/RECOMMENDATIONS WERE MAILED
TO PARTNERS ON OCTOBER 31, 2002 AND  SUPPLEMENT  NO. 1 WAS MAILED  DECEMBER  13,
2002 AND ARE  AVAILABLE  FROM  DORCHESTER  HUGOTON,  REPUBLIC  AND  SPINNAKER ON
REQUEST.  THE  PROSPECTUS/PROXY  STATEMENT,   SUPPLEMENTS  THERETO  AND  RELATED
SOLICITATION/RECOMMENDATIONS ARE AVAILABLE ON THE INTERNET AT THE SECURITIES AND
EXCHANGE COMMISSION'S WORLD WIDE WEB SITE AT HTTP://WWW.SEC.GOV.

     Dorchester  Hugoton,  Republic and Spinnaker and their  respective  General
Partners,  directors  and/or  officers,  as applicable,  may be deemed under the
Rules of the  Securities  and Exchange  Commission  to be  "participants  in the
solicitation"  of  proxies  from the  security  holders of  Dorchester  Hugoton,
Republic  and  Spinnaker  in  favor  of the  transaction.  SECURITY  HOLDERS  OF
DORCHESTER HUGOTON,  REPUBLIC AND SPINNAKER MAY OBTAIN INFORMATION REGARDING THE
INTERESTS   OF  THE   "PARTICIPANTS   IN  THE   SOLICITATION"   BY  READING  THE
PROSPECTUS/PROXY STATEMENT AND SUPPLEMENTS THERETO RELATING TO THE TRANSACTION.