SOUTHWEST ROYALTIES INSTITUTIONAL INCOME FUND XI-C LP
10-Q, 2000-08-10
CRUDE PETROLEUM & NATURAL GAS
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                                 3 of 16

                                FORM 10-Q


                    SECURITIES AND EXCHANGE COMMISSION
                         WASHINGTON, D.C.  20549

(MARK ONE)

(X)  QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d)
     OF THE SECURITIES EXCHANGE ACT OF 1934

For the quarterly period ended June 30, 2000

                                    OR

(  ) TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d)
     OF THE SECURITIES EXCHANGE ACT OF 1934

For the transition period from ________________ to ________________

Commission File Number 0-20298

         SOUTHWEST ROYALTIES INSTITUTIONAL 1990-91 INCOME PROGRAM
         Southwest Royalties Institutional Income Fund X-C, L.P.
                  (Exact name of registrant as specified
                  in its limited partnership agreement)

Delaware                                    75-2374449
(State or other jurisdiction of                (I.R.S. Employer
incorporation or organization)                Identification No.)


                       407 N. Big Spring, Suite 300
                           Midland, Texas 79701
                 (Address of principal executive offices)

                             (915) 686-9927
                     (Registrant's telephone number,
                           including area code)

Indicate  by  check  mark  whether registrant (1)  has  filed  all  reports
required to be filed by Section 13 or 15(d) of the Securities Exchange  Act
of 1934 during the preceding 12 months (or for such shorter period that the
registrant was required to file such reports), and (2) has been subject  to
such filing requirements for the past 90 days:

                            Yes   X   No

        The total number of pages contained in this report is 16.

<PAGE>
                     PART I. - FINANCIAL INFORMATION


Item 1. Financial Statements

The  unaudited  condensed financial statements included  herein  have  been
prepared  by  the Registrant (herein also referred to as the "Partnership")
in  accordance  with generally accepted accounting principles  for  interim
financial information and with the instructions to Form 10-Q and Rule 10-01
of Regulation S-X.  Accordingly, they do not include all of the information
and  footnotes  required  by generally accepted accounting  principles  for
complete   financial  statements.   In  the  opinion  of  management,   all
adjustments necessary for a fair presentation have been included and are of
a  normal  recurring nature.  The financial statements should  be  read  in
conjunction with the audited financial statements and the notes thereto for
the  year ended December 31, 1999 which are found in the Registrant's  Form
10-K  Report  for  1999 filed with the Securities and Exchange  Commission.
The December 31, 1999 balance sheet included herein has been taken from the
Registrant's  1999 Form 10-K Report.  Operating results for the  three  and
six month periods ended June 30, 2000 are not necessarily indicative of the
results that may be expected for the full year.

<PAGE>
         Southwest Royalties Institutional Income Fund X-C, L.P.

                              Balance Sheets


                                                 June 30,      December 31,
                                                   2000            1999
                                                ---------      ------------
                                               (unaudited)

  Assets

Current assets:
 Cash and cash equivalents                   $     59,548          22,098
 Receivable from Managing General Partner         107,362         113,004
                                                ---------       ---------
    Total current assets                          166,910         135,102
                                                ---------       ---------
Oil and gas properties - using the
 full cost method of accounting                 2,221,662       2,221,662
  Less accumulated depreciation,
   depletion and amortization                   1,944,479       1,929,479
                                                ---------       ---------
    Net oil and gas properties                    277,183         292,183
                                                ---------       ---------
                                             $    444,093         427,285
                                                =========       =========
  Liabilities and Partners' Equity

Current liability - Distributions payable    $          -               2
                                                ---------       ---------
Partners' equity:
 General partners                                (15,358)        (18,539)
 Limited partners                                 459,451         445,822
                                                ---------       ---------
    Total partners' equity                        444,093         427,283
                                                ---------       ---------
                                             $    444,093         427,285
                                                =========       =========

<PAGE>
         Southwest Royalties Institutional Income Fund X-C, L.P.

                         Statements of Operations
                               (unaudited)


                                 Three Months Ended      Six Months Ended
                                       June 30,              June 30,
                                    2000      1999        2000      1999

  Revenues

Income from net profits
 interests                    $    88,224     21,225    161,249     11,175
Interest                              702         56      1,154        119
                                  -------    -------    -------    -------
                                   88,926     21,281    162,403     11,294
                                  -------    -------    -------    -------

  Expenses

General and administrative         10,246     11,094     20,593     22,297
Depreciation, depletion and
 amortization                       4,000     10,000     15,000     30,000
                                  -------    -------    -------    -------
                                   14,246     21,094     35,593     52,297
                                  -------    -------    -------    -------
Net income (loss)             $    74,680        187    126,810   (41,003)
                                  =======    =======    =======    =======
Net income (loss) allocated to:

 Managing General Partner     $     7,081        917     12,763      (990)
                                  =======    =======    =======    =======
 General Partner              $       787        102      1,418      (110)
                                  =======    =======    =======    =======
 Limited Partners             $    66,812      (832)    112,629   (39,903)
                                  =======    =======    =======    =======
  Per limited partner unit    $    11.17       (.14)      18.82     (6.67)
                                  =======    =======    =======    =======

<PAGE>
         Southwest Royalties Institutional Income Fund X-C, L.P.

                         Statements of Cash Flows
                               (unaudited)


                                                        Six Months Ended
                                                             June 30,
                                                          2000      1999

Cash flows from operating activities:

 Cash received from income from net profits
  interests                                         $   160,060      3,425
 Cash paid to suppliers                                (13,762)   (18,460)
 Interest received                                        1,154        119
                                                        -------    -------
  Net cash provided by (used by) operating activities   147,452    (14,916)
                                                        -------    -------
Cash flows from investing activities:

 Cash received from sale of oil and gas properties            -     18,643
                                                        -------    -------
Cash flows used in financing activities:

 Distributions to partners                            (110,002)          -
                                                        -------    -------

Net increase in cash and cash equivalents                37,450      3,727

 Beginning of period                                     22,098      5,341
                                                        -------    -------
 End of period                                      $    59,548      9,068
                                                        =======    =======

                                                               (continued)

<PAGE>
         Southwest Royalties Institutional Income Fund X-C, L.P.

                   Statements of Cash Flows, continued
                               (unaudited)


                                                        Six Months Ended
                                                             June 30,
                                                          2000      1999

Reconciliation of net income (loss) to net
 cash provided by (used in) operating activities:

Net income (loss)                                   $   126,810   (41,003)

Adjustments to reconcile net income (loss) to net
 cash provided by (used in) operating activities:

  Depreciation, depletion and amortization               15,000     30,000
  Increase in receivables                               (1,189)    (7,750)
  Increase in payables                                    6,831      3,837
                                                        -------    -------
Net cash provided by (used in) operating activities $   147,452   (14,916)
                                                        =======    =======

<PAGE>
         Southwest Royalties Institutional Income Fund X-C, L.P.
                     (a Delaware limited partnership)

                      Notes to Financial Statements


1.   Organization
     Southwest  Royalties Institutional Income Fund X-C, L.P. was organized
     under the laws of the state of Delaware on September 20, 1991, for the
     purpose  of acquiring producing oil and gas properties and to  produce
     and market crude oil and natural gas produced from such properties for
     a  term  of 50 years, unless terminated at an earlier date as provided
     for  in the Partnership Agreement.  The Partnership sells its oil  and
     gas production to several purchasers with the prices it receives being
     dependent  upon  the oil and gas economy.  Southwest  Royalties,  Inc.
     serves as the Managing General Partner and H. H. Wommack, III, as  the
     individual   general  partner.   Revenues,  costs  and  expenses   are
     allocated as follows:

                                                     Limited      General
                                                     Partners     Partners
                                                     --------     --------
     Interest income on capital contributions       100%             -
     Oil and gas sales                               90%           10%
     All other revenues                              90%           10%
     Organization and offering costs (1)            100%             -
     Syndication costs                              100%             -
     Amortization of organization costs             100%             -
     Property acquisition costs                     100%             -
     Gain/loss on property disposition               90%           10%
     Operating and administrative costs (2)          90%           10%
     Depreciation, depletion and amortization
      of oil and gas properties                     100%             -
     All other costs                                 90%           10%

          (1)   All  organization costs in excess of 3% of initial  capital
          contributions  will be paid by the Managing General  Partner  and
          will  be treated as a capital contribution.  The Partnership paid
          the  Managing  General Partner an amount equal to 3%  of  initial
          capital contributions for such organization costs.

          (2)   Administrative costs in any year which exceed 2% of capital
          contributions shall be paid by the Managing General  Partner  and
          will be treated as a capital contribution.

2.   Summary of Significant Accounting Policies
     The  interim  financial information as of June 30, 2000, and  for  the
     three  and  six  months  ended June 30, 2000, is  unaudited.   Certain
     information  and footnote disclosures normally included  in  financial
     statements  prepared in accordance with generally accepted  accounting
     principles  have been condensed or omitted in this Form 10-Q  pursuant
     to   the   rules  and  regulations  of  the  Securities  and  Exchange
     Commission.   However,  in  the opinion of management,  these  interim
     financial  statements include all the necessary adjustments to  fairly
     present  the  results of the interim periods and all such  adjustments
     are  of a normal recurring nature.  The interim consolidated financial
     statements  should  be read in conjunction with the audited  financial
     statements for the year ended December 31, 1999.

<PAGE>

Item 2.                                Management's Discussion and Analysis
          of Financial Condition and Results of Operations

General

Southwest Royalties Institutional Income Fund X-C, L.P. was organized as  a
Delaware limited partnership on September 20, 1991.  The offering  of  such
limited  partnership interests began October 1, 1991 as  part  of  a  shelf
offering registered under the name Southwest Royalties Institutional  1990-
91  Income Program.  Minimum capital requirements for the Partnership  were
met on January 28, 1992, with the offering of limited partnership interests
concluding April 30, 1992, with 340 limited partners purchasing 5,983 units
for $2,991,500.

The Partnership was formed to acquire royalty and net profits interests  in
producing  oil  and  gas properties, to produce and market  crude  oil  and
natural  gas  produced  from such properties, and  to  distribute  the  net
proceeds from operations to the limited and general partners.  Net revenues
from  producing  oil  and gas properties will not be  reinvested  in  other
revenue  producing  assets except to the extent that production  facilities
and wells are improved or reworked or where methods are employed to improve
or enable more efficient recovery of oil and gas reserves.

Increases   or   decreases   in  Partnership   revenues   and,   therefore,
distributions  to partners will depend primarily on changes in  the  prices
received  for  production,  changes in volumes of  production  sold,  lease
operating  expenses, enhanced recovery projects, offset drilling activities
pursuant to farmout arrangements, sales of properties, and the depletion of
wells.  Since wells deplete over time, production can generally be expected
to decline from year to year.

Well  operating costs and general and administrative costs usually decrease
with   production   declines;  however,  these  costs  may   not   decrease
proportionately.  Net income available for distribution to the partners  is
therefore expected to fluctuate in later years based on these factors.

Based  on  current  conditions, management does not  anticipate  performing
workovers during the year.

Oil and Gas Properties

Oil  and  gas  properties  are accounted for at cost  under  the  full-cost
method.  Under this method, all productive and nonproductive costs incurred
in  connection with the acquisition, exploration and development of oil and
gas  reserves  are capitalized.  Gain or loss on the sale of  oil  and  gas
properties  is not recognized unless significant oil and gas  reserves  are
involved.

The  Partnership's policy for depreciation, depletion and  amortization  of
oil  and  gas  properties is computed under the units  of  revenue  method.
Under the units of revenue method, depreciation, depletion and amortization
is  computed  on  the  basis of current gross revenues from  production  in
relation  to future gross revenues, based on current prices, from estimated
production of proved oil and gas reserves.

Should the net capitalized costs exceed the estimated present value of  oil
and gas reserves, discounted at 10%, such excess costs would be charged  to
current  expense.  As of June 30, 2000, the net capitalized costs  did  not
exceed the estimated present value of oil and gas reserves.



<PAGE>
Results of Operations

A.  General Comparison of the Quarters Ended June 30, 2000 and 1999

The  following  table  provides certain information  regarding  performance
factors for the quarters ended June 30, 2000 and 1999:

                                               Three Months
                                                  Ended          Percentage
                                                 June 30,         Increase
                                              2000       1999    (Decrease)
                                              ----       ----    ----------
Average price per barrel of oil          $    25.88     14.79      75%
Average price per mcf of gas             $     3.59      1.97      82%
Oil production in barrels                     7,600     8,600    (12%)
Gas production in mcf                         9,200    15,370    (40%)
Income from net profits interests        $   88,224    21,225     316%
Partnership distributions                $   55,000         -     100%
Limited partner distributions            $   49,500         -     100%
Per unit distribution to limited
 partners                                $     8.27         -     100%
Number of limited partner units               5,983     5,983

Revenues

The  Partnership's income from net profits interests increased  to  $88,224
from  $21,225  for the quarters ended June 30, 2000 and 1999, respectively,
an increase of 316%.  The principal factors affecting the comparison of the
quarters ended June 30, 2000 and 1999 are as follows:

1.  The  average  price  for a barrel of oil received  by  the  Partnership
    increased  during the quarter ended June 30, 2000 as  compared  to  the
    quarter ended June 30, 1999 by 75%, or $11.09 per barrel, resulting  in
    an  increase  of  approximately $95,400  in  income  from  net  profits
    interests.  Oil sales represented 86% of total oil and gas sales during
    the  quarters ended June 30, 2000 as compared to 81% during the quarter
    ended June 30, 1999.

    The  average  price  for  an  mcf of gas received  by  the  Partnership
    increased during the same period by 82%, or $1.62 per mcf, resulting in
    an  increase  of  approximately $24,900  in  income  from  net  profits
    interests.

    The  total  increase in income from net profits interests  due  to  the
    change  in prices received from oil and gas production is approximately
    $120,300.  The market price for oil and gas has been extremely volatile
    over  the  past  decade, and management expects  a  certain  amount  of
    volatility to continue in the foreseeable future.


<PAGE>
2.  Oil  production decreased approximately 1,000 barrels or 12% during the
    quarter  ended June 30, 2000 as compared to the quarter ended June  30,
    1999,  resulting in a decrease of approximately $25,900 in income  from
    net profits interests.

    Gas production decreased approximately 6,170 mcf or 40% during the same
    period, resulting in a decrease of approximately $22,200 in income from
    net profits interests.

    The  total  decrease in income from net profits interests  due  to  the
    change  in  production is approximately $48,100. The  decrease  in  gas
    production  is primarily due to a non-operated gas well.  The  operator
    performed  a  workover during the last quarter of 1999, which  was  not
    only  unsuccessful, but caused the well to shut down.  The well is  not
    believed  to  be  recoverable, thus the  loss  to  the  Partnership  is
    considered to be permanent.  This well represented approximately  1,120
    mcf a month to the Partnership.

3.  Lease   operating  costs  and  production  taxes  were  3%  lower,   or
    approximately  $4,800 less during the quarter ended June  30,  2000  as
    compared to the quarter ended June 30, 1999.

Costs and Expenses

Total costs and expenses decreased to $14,246 from $21,094 for the quarters
ended  June  30,  2000  and 1999, respectively, a  decrease  of  32%.   The
decrease  is  the  result  of  lower  depletion  expense  and  general  and
administrative expense.

1.  General and administrative costs consists of independent accounting and
    engineering  fees,  computer services, postage,  and  Managing  General
    Partner personnel costs.  General and administrative costs decreased 8%
    or  approximately  $800  during the quarter  ended  June  30,  2000  as
    compared to the quarter ended June 30, 1999.

2.  Depletion  expense decreased to $4,000 for the quarter ended  June  30,
    2000  from  $10,000  for the same period in 1999.   This  represents  a
    decrease  of 60%.  Depletion is calculated using the units  of  revenue
    method  of  amortization based on a percentage of current period  gross
    revenues  to  total future gross oil and gas revenues, as estimated  by
    the  Partnership's  independent  petroleum  consultants.   Contributing
    factors  to  the  decline in depletion expense between the  comparative
    periods were the increase in the price of oil and gas used to determine
    the Partnership's reserves for July 1, 2000 as compared to 1999.

<PAGE>
B.  General  Comparison of the Six Month Periods Ended June  30,  2000  and
    1999

The  following  table  provides certain information  regarding  performance
factors for the six month periods ended June 30, 2000 and 1999:

                                                Six Months
                                                  Ended          Percentage
                                                 June 30,         Increase
                                              2000       1999    (Decrease)
                                              ----       ----    ----------

Average price per barrel of oil          $   26.13      12.38     111%
Average price per mcf of gas             $    3.55       1.82      95%
Oil production in barrels                   15,500     17,600    (12%)
Gas production in mcf                       11,840     28,500    (58%)
Income from net profits interests        $ 161,249     11,175   1,343%
Partnership distributions                $ 110,000          -     100%
Limited partner distributions            $  99,000          -     100%
Per unit distribution to limited
 partners                                $   16.55          -     100%
Number of limited partner units              5,983      5,983

Revenues

The  Partnership's income from net profits interests increased to  $161,249
from $11,175 for the six months ended June 30, 2000 and 1999, respectively,
an  increase of 1,343%.  The principal factors affecting the comparison  of
the six months ended June 30, 2000 and 1999 are as follows:

1.  The  average  price  for a barrel of oil received  by  the  Partnership
    increased during the six months ended June 30, 2000 as compared to  the
    six months ended June 30, 1999 by 111%, or $13.75 per barrel, resulting
    in  an  increase of approximately $242,000 in income from  net  profits
    interests.  Oil sales represented 91% of total oil and gas sales during
    the  six  months ended June 30, 2000 as compared to 81% during the  six
    months ended June 30, 1999.

    The  average  price  for  an  mcf of gas received  by  the  Partnership
    increased during the same period by 95%, or $1.73 per mcf, resulting in
    an  increase  of  approximately $49,300  in  income  from  net  profits
    interests.

    The  total  increase in income from net profits interests  due  to  the
    change  in prices received from oil and gas production is approximately
    $291,300.  The market price for oil and gas has been extremely volatile
    over  the  past  decade, and management expects  a  certain  amount  of
    volatility to continue in the foreseeable future.

<PAGE>
2.  Oil  production decreased approximately 2,100 barrels or 12% during the
    six months ended June 30, 2000 as compared to the six months ended June
    30,  1999,  resulting in a decrease of approximately $54,900 in  income
    from net profits interests.

    Gas  production  decreased approximately 16,660 mcf or 58%  during  the
    same period, resulting in a decrease of approximately $59,100 in income
    from net profits interests.

    The  total  decrease in income from net profits interests  due  to  the
    change  in  production  is  approximately $114,000.  The  Partnership's
    dramatic decline in gas production was primarily in connection with two
    wells.  During 1999, the Partnership was involved in a lawsuit in order
    to  receive payment for two months of production from the purchaser  at
    that  time.   The  lawsuit was settled in the  current  year  with  the
    Partnership  receiving  less than was owed  from  the  purchaser.   The
    original  accrual  recorded  during the  second  quarter  of  1999  was
    reversed  in the current year.  This reversal represented approximately
    2,800  mcf.   Additionally, the partnership  was  informed  during  the
    current  year  that  a  workover which was performed  during  the  last
    quarter  of  1999 on a non-operated well was not only unsuccessful  but
    caused  the  well  to  shut down.  This well  is  not  believed  to  be
    recoverable,  thus  the loss to the Partnership  is  considered  to  be
    permanent.   This  well represented approximately 1,120  mcf  a  month.
    Total decline for the partnership during the six months ended June  30,
    2000 in connection with this non-operated well was approximately 11,190
    mcf.

3.  Lease  operating  costs  and  production  taxes  were  11%  higher,  or
    approximately $27,200 more during the six months ended June 30, 2000 as
    compared to the six months ended June 30, 1999.

Costs and Expenses

Total  costs  and expenses decreased to $35,593 from $52,297  for  the  six
months ended June 30, 2000 and 1999, respectively, a decrease of 32%.   The
decrease is the result of a decrease in general and administrative  expense
and depletion expense.

1.  General and administrative costs consists of independent accounting and
    engineering  fees,  computer services, postage,  and  Managing  General
    Partner personnel costs.  General and administrative costs decreased 8%
    or  approximately $1,700 during the six months ended June 30,  2000  as
    compared to the six months ended June 30, 1999.

2.  Depletion  expense decreased to $15,000 for the six months  ended  June
    30,  2000 from $30,000 for the same period in 1999.  This represents  a
    decrease  of 50%.  Depletion is calculated using the units  of  revenue
    method  of  amortization based on a percentage of current period  gross
    revenues  to  total future gross oil and gas revenues, as estimated  by
    the  Partnership's  independent  petroleum  consultants.   Contributing
    factors  to  the  decline in depletion expense between the  comparative
    periods were the increase in the price of oil and gas used to determine
    the Partnership's reserves for July 1, 2000 as compared to 1999.

<PAGE>
Liquidity and Capital Resources

The  primary source of cash is from operations, the receipt of income  from
interests in oil and gas properties.  The Partnership knows of no  material
change, nor does it anticipate any such change.

Cash  flows  provided by (used in) operating activities were  approximately
$147,500 in the six months ended June 30, 2000 as compared to approximately
$(14,900) in the six months ended June 30, 1999.

There  were no investing activities in the six months ended June 30,  2000.
Cash  flows provided by investing activities were approximately $18,600  in
the six months ended June 30, 1999.

Cash  flows used in financing activities in the six months ended  June  30,
2000  were  approximately  $110,000.  There were  no  financing  activities
during  the  six  months  ended June 30, 1999. The only  use  in  financing
activities was the distributions to partners.

Total distributions during the six months ended June 30, 2000 were $110,000
of which $99,000 was distributed to the limited partners and $11,000 to the
general partners.  The per unit distribution to limited partners during the
six  months  ended  June 30, 2000 was $16.55.  There were no  distributions
during the six months ended June 30, 1999.

The  source  for  the  2000  distributions of $110,000  were  oil  and  gas
operations  of  approximately  $147,500,  resulting  in  excess  cash   for
contingencies or subsequent distributions.

Since  inception of the Partnership, cumulative monthly cash  distributions
of  $2,757,245  have  been made to the partners.   As  of  June  30,  2000,
$2,495,005 or $417.02 per limited partner unit has been distributed to  the
limited partners, representing a 83% return of the capital contributed.

As  of June 30, 2000, the Partnership had approximately $166,900 in working
capital.   The  Managing  General Partner knows of no  unusual  contractual
commitments  and  believes  the  revenues  generated  from  operations  are
adequate to meet the needs of the Partnership.

<PAGE>
Liquidity - Managing General Partner

The  Managing General Partner has a highly leveraged capital structure with
over  $50.1  million principal due by December 31, 2000 and  $15.3  million
interest   payments  due  within  the  next  twelve  months  on  its   debt
obligations.  The Managing General Partner is currently in the  process  of
renegotiating  the  terms  of its various obligations  with  its  creditors
and/or  attempting to seek new lenders or equity investors.   Additionally,
the Managing General Partner would consider disposing of certain assets  in
order to meet its obligations.

There  can  be  no  assurance  that  the Managing  General  Partner's  debt
restructuring efforts will be successful or that the lenders will agree  to
a   course   of  action  consistent  with  the  Managing  General  Partners
requirements  in restructuring the obligations.  Even if such agreement  is
reached,  it  may  require approval of additional  lenders,  which  is  not
assured.  Furthermore, there can be no assurance that the sales  of  assets
can  be  successfully  accomplished on terms  acceptable  to  the  Managing
General   Partner.   Under  current  circumstances,  the  Managing  General
Partner's  ability to continue as a going concern depends upon its  ability
to  (1)  successfully  restructure  its obligations  or  obtain  additional
financing  as  may  be  required, (2) maintain  compliance  with  all  debt
covenants, (3) generate sufficient cash flow to meet its obligations  on  a
timely  basis, and (4) achieve satisfactory levels of future earnings.   If
the  Managing  General Partner is unsuccessful in its efforts,  it  may  be
unable to meet its obligations making it necessary to undertake such  other
actions as may be appropriate to preserve asset values.



<PAGE>
                       PART II. - OTHER INFORMATION


Item 1. Legal Proceedings

        None

Item 2. Changes in Securities

        None

Item 3. Defaults Upon Senior Securities

        None

Item 4. Submission of Matter to a Vote of Security Holders

        None

Item 5. Other Information

        None

Item 6. Exhibits and Reports on Form 8-K

        (a) Exhibits:

             27 Financial Data Schedule

             (b)    Reports on Form 8-K:

             No reports on Form 8-
             K were filed during the quarter ended June 30, 2000.

<PAGE>
                                SIGNATURES


Pursuant  to the requirements of the Securities Exchange Act of  1934,  the
registrant  has duly caused this report to be signed on its behalf  by  the
undersigned thereunto duly authorized.

                                 SOUTHWEST ROYALTIES INSTITUTIONAL
                                 INCOME FUND X-C, L.P.
                                 a Delaware limited partnership


                                 By:   Southwest Royalties, Inc.
                                       Managing General Partner


                              By:  /s/ J Steven Person
                                   ------------------------------
                                   J Steven Person, Vice-President of
                                   Marketing and Chief Financial Officer
                                   of Southwest Royalties, Inc.
                                   the Managing General Partner

Date: August 15, 2000

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