
                                                                    EXHIBIT 23.1

                   CONSENT OF INDEPENDENT PUBLIC ACCOUNTANTS

     As independent public accountants, we hereby consent to the incorporation
of our report included in this Form 8-K, into the Company's previously filed
registration statements on Form S-3 (File No. 333-27575), on Form S-8 (File No.
333-30155) and on Form S-8 (File No. 333-30157).

ARTHUR ANDERSEN LLP

Houston, Texas
August 8, 1997

