**Exhibit
      3.8**





**AMENDMENT
      OF BYLAWS**


**DIRECT
      REGISTRATION SYSTEM**














Section
      7.2(a) of the Bylaws was amended in its entirety to read as
      follows:





"The
      Trust shall deliver certificates representing shares to which shareholders
      are
      entitled, provided that the Board of Trust Managers may provide by resolution
      that some or all of any class or series of the Trust's shares may be
      uncertificated shares.  Any such resolution shall not apply to shares
      represented by a certificate until such certificate is surrendered to the Trust
      (or the transfer agent or registrar, as the case may
      be).  Notwithstanding the adoption of such resolution by the Board of
      Trust Managers, every holder of shares represented by certificates and, upon
      request, a holder of uncertificated shares shall be entitled to have a
      certificate signed in the name of the Trust by the Chairman of the Board, if
      any, or the President or a Vice President and by the Treasurer or an Assistant
      Treasurer or the Secretary or any Assistant Secretary, certifying the number
      of
      shares and the class or series of shares of the Trust owned by the
      shareholder.  Any or all of the signatures on the certificate may be
      facsimile.  In case any officer, transfer agent or registrar who has
      signed or whose facsimile signature has been placed upon a certificate shall
      have ceased to be such officer, transfer agent or registrar before such
      certificate is issued, it may be issued by the Trust with the same effect as
      if
      such person were an officer, transfer agent or registrar at the date of
      issue.  If a holder of uncertificated shares elects to receive a
      certificate for shares of the Trust's shares, the Trust (or the transfer agent
      or registrar, as the case may be) shall (to the extent permitted under
      applicable law and rules, regulations and listing requirements of any stock
      exchange or stock market on which the Trust's shares are listed or traded),
      cease providing annual statements indicating such holder's holdings of shares
      in
      the Trust.  Such certificates shall be numbered and shall be entered
      in the books of the Trust as they are issued, and shall be signed by the
      Chairman of the Board, the President or any Vice President and the Treasurer
      or
      an Assistant Treasurer or the Secretary or an Assistant Secretary of the Trust,
      and may be sealed with the seal of the Trust or a facsimile
      thereof.  The signatures of such officers upon a certificate may be
      facsimiles. In case any officer who has signed or whose facsimile signature
      has
      been placed upon such certificate shall have ceased to be such officer before
      such certificate is issued, it may be issued by the Trust with the same effect
      as if he were such officer at the date of its issuance.  Each
      certificate representing shares issued by the Trust shall conspicuously set
      forth such provisions as are required by applicable law.  Each
      certificate representing shares shall state upon the face thereof that the
      Trust
      is organized under the laws of the State of Texas, the name of the person to
      whom issued, the number and class of shares and the designation of the series,
      if any, that such certificate represents and the par value of each share
      represented by such certificate or a statement that the shares are without
      par
      value.  No certificate shall be issued for any share until the full
      amount of the consideration therefor, fixed as provided by law, has been paid
      or
      delivered."