LACLEDE GAS CO
8-K, 1997-11-06
NATURAL GAS DISTRIBUTION
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<PAGE>
 
                      SECURITIES AND EXCHANGE COMMISSION

                            Washington, D.C. 20549

                                   Form 8-K

                                CURRENT REPORT

                    Pursuant to Section 13 or 15(d) of the
                        Securities Exchange Act of 1934


      Date of Report (Date of earliest event reported): October 16, 1997


                              LACLEDE GAS COMPANY

- --------------------------------------------------------------------------------
            (Exact name of registrant as specified in its charter)


           Missouri                       1-1822                  43-0368139

- --------------------------------------------------------------------------------
   (State or other jurisdiction        (Commission              (IRS Employer
         of incorporation)              File Number)             Identifica-
                                                                 tion No.)
    
        720 Olive Street            St. Louis, Missouri             63101

- --------------------------------------------------------------------------------
(Address of principal executive offices)                          (Zip Code) 

Registrant's telephone number, including area code (314) 342-0500
                                                   --------------

                                     NONE

- --------------------------------------------------------------------------------

         (Former name or former address, if changed since last report)
<PAGE>
 
Item 5. Other Events.
- ---------------------

        Pursuant to an Underwriting Agreement, effective October 16, 1997 (the 
"Underwriting Agreement"), Laclede Gas Company (the "Registrant"), on October 
21, 1997, sold to ABN AMRO Chicago Corporation, the Underwriter named on 
Schedule I of the attached Underwriting Agreement, $25,000,000 aggregate 
principal amount of its First Mortgage Bonds, 6 1/2% Series due October 15, 2012
(the "Bonds"). The Bonds have been issued under a Mortgage and Deed of Trust,
dated as of February 1, 1945, under which State Street Bank and Trust Company of
Missouri, N.A. is the present Trustee. Such Mortgage and Deed of Trust had
previously been amended and supplemented and has been further supplemented by a
Twenty-Third Supplemental Indenture, dated as of October 15, 1997 (the
"Supplemental Indenture"). The registration statement on Form S-3 with respect
to the First Mortgage Bonds of the Registrant, including the Bonds (File No. 33-
60996), was filed by the Registrant on April 13, 1993 and declared effective by
the Securities and Exchange Commission on April 21, 1993. Copies of the
Underwriting Agreement and the Supplemental Indenture are attached hereto as
Exhibits 1.01 and 4.01, respectively.

Item 7. Exhibits. 
- ----------------

        Reference is made to the information contained in the Index to Exhibits 
filed as part of this Form 8-K.
<PAGE>
 
                                   SIGNATURE

        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 hereunto duly authorized.

                                       LACLEDE GAS COMPANY
                                                           
                                       --------------------
                                       (Registrant)         



                                       By:/s/ Gerald T. McNeive, Jr.
                                          ----------------------------------   
                                          Gerald T. McNeive, Jr.               
                                          Senior Vice President-               
                                          Finance and Chief Financial          
                                          Officer                               


November 6, 1997 
- ----------------- 
    (Date)         
<PAGE>
 
                               Index to Exhibits

Exhibit No.
- ----------

1.01            Underwriting Agreement, dated October 16, 1997, entered into by 
                the Registrant and the Underwriter relating to the Bonds.

4.01            Twenty-Third Supplemental Indenture dated as of October 15,
                1997, to Registrant's Mortgage and Deed of Trust, dated as of
                February 1, 1945.

<PAGE>
 

                                                                    EXHIBIT 1.01

                            UNDERWRITING AGREEMENT

                              For the Purchase of
                   $25,000,000 Aggregate Principal Amount of
           First Mortgage Bonds, 6 1/2% Series due October 15, 2012
                            of Laclede Gas Company

Laclede Gas Company
c/o Winthrop, Stimson, Putnam & Roberts
One Battery Park Plaza
New York, New York  10004-1490

        Section 1. Purchase and Sale. On the basis of the representations and
                   -----------------
warranties, and subject to the terms and conditions set forth in this agreement
("Underwriting Agreement"), each of the Underwriters (as defined in Section 2
hereof) shall purchase from Laclede Gas Company ("Company"), severally and not
jointly, and the Company shall sell to each of the Underwriters, the principal
amount of the Company's First Mortgage Bonds ("Bonds") set forth opposite the
name of such Underwriter in Schedule I hereto at the price (stated as a
percentage of the principal amount of the Bonds) and interest rate per annum as
specified in Schedule II hereto, plus accrued interest, if any, from the
fifteenth day of the month in which such Bonds are issued to the Closing Date
(as defined in Section 6(a) hereof).

        Section 2. Underwriters and Representative. The term "Underwriters", as
                   -------------------------------
used herein, shall be deemed to mean the several persons, firms or corporations
named in Schedule I hereto, and the term "Representative", as used herein, shall
be deemed to mean the representative or representatives of such Underwriters by
whom or on whose behalf this Underwriting Agreement is signed. If there shall be
only one person, firm or corporation named in such Schedule I, the term
"Underwriters" and the term "Representative", as used herein, shall mean that
person, firm or corporation. All obligations of the Underwriters are several and
not joint.
<PAGE>
 
        Section 3. Description of Bonds. The Company proposes to issue and sell
                   --------------------
the Bonds under its Mortgage and Deed of Trust, dated as of February 1, 1945, as
supplemented and as it will be further supplemented by a supplemental indenture
("Supplemental Indenture") relating to the Bonds to be dated as of the fifteenth
day of the calendar month in which the Bonds are issued. Such Mortgage and Deed
of Trust as supplemented and to be supplemented by the Supplemental Indenture is
hereinafter referred to as the "Mortgage". The Bonds are more fully described in
the Basic Prospectus hereinafter referred to and in the Company's letter, dated
October 9, 1997, to prospective underwriters of the Bonds.

        Section 4. Representations and Warranties of the Company. The Company
                   ---------------------------------------------
represents and warrants that:

                (a) It has filed with the Securities and Exchange Commission
        ("Commission") a registration statement (No. 33-60996) for the
        registration of the Bonds under the Securities Act of 1933, as amended
        ("Securities Act"), and the registration statement has become effective.
        The prospectus forming a part of such registration statement, as it
        heretofore initially became effective, including all documents
        incorporated therein by reference at that time pursuant to Item 12 of
        Form S-3 under the Securities Act, is hereinafter referred to as the
        "Basic Prospectus". In the event that the Basic Prospectus shall have
        been amended, revised or supplemented (but excluding any supplement to
        the Basic Prospectus relating solely to First Mortgage Bonds that are
        not included in the Bonds) prior to the date of this Underwriting
        Agreement, or if the Company files any documents pursuant to Section 13
        or 14 of the Securities Exchange Act of 1934, as amended ("Exchange
        Act"), after the time the registration statement initially became
        effective and up to the date of this Underwriting Agreement (but
        excluding documents incorporated therein by reference relating solely to
        First Mortgage Bonds that are not included in the Bonds), which
        documents are deemed to be incorporated by reference in the Basic
        Prospectus, the term "Basic Prospectus" as used herein shall also mean
        such prospectus as so amended, revised or supplemented. Such
        registration statement, as it initially became effective and as it may
        have been amended by any amendment thereto (including for these purposes
        as an amendment any document incorporated by reference in the Basic
        Prospectus), and the Basic Prospectus, as it shall be supplemented to
        reflect the terms of offering and sale of the Bonds by a prospectus
        supplement ("Prospectus Supplement") to be filed with the Commission
        pursuant to Rule 424 under the Securities Act ("Rule 424"), are
        hereinafter referred to as the "Registration Statement" and the
        "Prospectus", respectively. After the date of this Underwriting
        Agreement, the Company will not file (i) without prior notice to the
        Representative and to Winthrop, Stimson, Putnam & Roberts ("Counsel for
        the Underwriters"), (A) any amendment to the Registration Statement
        (excluding any amendment relating solely to First Mortgage Bonds that
        are not included in the Bonds) or supplement to the Prospectus or (B)
        prior to the time the Prospectus is filed with the Commission pursuant
        to Rule 424, any document that is to be incorporated by reference in, or
        any supplement (including the Prospectus Supplement) to, the Basic
        Prospectus or (ii) any such amendment, supplement or document to which
        the Representative or such counsel shall reasonably object in writing.
        For purposes of this Underwriting Agreement, any document that is filed
        with theQS

                                       2
<PAGE>
 
        Commission after the date of this Underwriting Agreement and is
        incorporated by reference in the Prospectus (except documents
        incorporated by reference relating solely to First Mortgage Bonds that
        are not included in the Bonds) pursuant to Item 12 of Form S-3 under the
        Securities Act shall be deemed a supplement to the Prospectus.

               (b) When the Prospectus is filed with the Commission pursuant to
        Rule 424 and at the Closing Date, the Registration Statement and the
        Prospectus, as they may then be amended or supplemented, and the
        Mortgage will fully comply in all material respects with the applicable
        provisions of the Securities Act and the Trust Indenture Act of 1939, as
        amended ("Trust Indenture Act"), and the rules and regulations of the
        Commission under such Acts, or pursuant to such rules and regulations
        will be deemed to comply therewith; on the date it became effective the
        Registration Statement did not, and, on the date that any post-effective
        amendment to the Registration Statement became or becomes effective
        (including the filing with the Commission under the Exchange Act of the
        Annual Report on Form 10-K of the Company for any fiscal year ending
        after the Registration Statement initially became effective, but
        excluding any post-effective amendment relating solely to First Mortgage
        Bonds that are not included in the Bonds), the Registration Statement,
        as amended by such post-effective amendment, did not or will not, as the
        case may be, contain an untrue statement of a material fact or omit to
        state a material fact required to be stated therein or necessary to make
        the statements therein not misleading; at the time the Prospectus is
        filed with the Commission pursuant to Rule 424 and on the Closing Date,
        the Prospectus, as it may then be amended or supplemented, will not
        include an untrue statement of a material fact or omit to state a
        material fact necessary in order to make the statements therein, in the
        light of the circumstances under which they are made, not misleading,
        and at such time and on such dates the documents then incorporated by
        reference in the Prospectus pursuant to Item 12 of Form S-3 under the
        Securities Act will fully comply in all material respects with the
        applicable provisions of the Exchange Act and the rules and regulations
        of the Commission thereunder, and, when read together with the
        Prospectus, or the Prospectus as it may then be amended or supplemented,
        will not contain an untrue statement of a material fact or omit to state
        a material fact required to be stated therein or necessary to make the
        statements therein, in the light of the circumstances under which they
        are made, not misleading; provided, however, that the foregoing
        representations and warranties in this Section 4(b) shall not apply to
        statements or omissions made in reliance upon and in conformity with
        written information furnished to the Company by or through the
        Representative on behalf of any Underwriter for use in connection with
        the preparation of the Registration Statement or the Prospectus, as they
        may be amended or supplemented, or to any statements in or omissions
        from the Statement of Eligibility on Form T-1 under the Trust Indenture
        Act of the trustee under the Mortgage.

               (c) The consummation by the Company of the transactions herein
        contemplated and the fulfillment of the terms hereof will not result in
        a breach of any of the terms or provisions of, or constitute a default
        under, the Company's Articles of Incorporation, as amended, or the By-
        Laws, as currently in effect, or any indenture, mortgage, deed of trust
        or other agreement or instrument to which the Company is now a party by
        succession or 

                                       3
<PAGE>
 
        otherwise, or any order, rule or regulation applicable to the Company of
        any court or of any federal or state regulatory board or body or
        administrative agency having jurisdiction over the Company or its
        property.

               (d) Since the most recent date as of which information is given
        in the Prospectus, there has not been any change in the business,
        properties or condition (financial or otherwise) of the Company except
        changes arising from transactions in the ordinary course of business,
        none of which alone or in the aggregate has had a material adverse
        effect on the business, properties or condition (financial or otherwise)
        of the Company, in each case other than as referred to in, or
        contemplated by, the Prospectus.

        Section 5.  Offering.  Forthwith upon the execution of this Underwriting
                    --------
Agreement, the Representative, acting on behalf of the Underwriters, shall
advise the Company whether or not a public offering of the Bonds is to be made,
and, if so, shall furnish to the Company (which information shall be confirmed
in writing as soon as practicable thereafter) (a) the information with respect
to any proposed reoffering of the Bonds and related matters that are required to
complete the Prospectus Supplement or any post-effective amendment to the
Registration Statement that may be required and a copy of any "agreement among
underwriters"; and (b) if a post-effective amendment to the Registration
Statement is required, a consent, if necessary, to the filing of the
post-effective amendment and an acceptable power-of-attorney, if necessary,
authorizing an available individual to sign the consent on its behalf. Such
information, consent and power-of-attorney may be provided by telex or facsimile
transmission (in the case of such consent or power-of-attorney, followed
promptly by an executed copy). Nothing in this Underwriting Agreement shall be
construed to require that the Underwriters make any such public offering on a
"fixed price" basis; and the Representative agrees to notify the Company in
writing of any change in the plan of distribution of the Bonds that would
require a supplement to the Prospectus or an amendment to the Registration
Statement.

        Section 6.  Time and Place of Closing.
                    -------------------------
        (a) Delivery of the Bonds shall be made to the Representative for the
accounts of the respective Underwriters at the offices of The Chase Manhattan
Bank, New York, New York, and payment therefor by check or checks, payable to
the Company or its order in The City of New York in Federal Reserve Funds or by
written evidence satisfactory to Company in other immediately available funds,
shall be made at the offices of Winthrop, Stimson, Putnam & Roberts, One Battery
Park Plaza, New York, New York, in each case at 10:00 A.M., New York time, on a
date that is three Business Days after the date of this Underwriting Agreement,
or at such other place, time and/or earlier date as the Representative and the
Company may agree upon in writing. The hour and date of such delivery and
payment are herein called the "Closing Date". The Bonds shall be delivered to
the Representative at the Closing Date for the respective accounts of the
Underwriters in registered form in such authorized denominations and registered
in such names as the Representative may reasonably request in writing at least
three Business Days (as defined below) prior to the Closing Date, or, to the
extent not so requested, in the names of the respective Underwriters in such
denominations as the Company shall determine. The Company agrees to make the
Bonds available to the Representative for checking not later 

                                       4
<PAGE>
 
than 2:30 P.M., New York time, on the last business day preceding the Closing
Date at the offices of The Chase Manhattan Bank, New York, New York, or at such
other place, time and/or date as may be agreed upon between the Company and the
Representative. If the Representative shall request that any Bond be registered
in a name other than that of an Underwriter, such Underwriter shall pay the
transfer taxes, if any, resulting from such issuance. "Business Day" shall mean
any day on which the Commission and banks in The City of New York are open.

        (b) If any Underwriter shall fail or refuse (whether for some reason
sufficient to justify its termination of its obligations to purchase or
otherwise) to purchase the Bonds that it had agreed to purchase, the Company
shall immediately notify the Representative, and the Representative may, within
24 hours of receipt of such notice, procure some other responsible party or
parties satisfactory to the Company, to purchase or agree to purchase such Bonds
on the terms herein set forth; and, if the Representative shall fail to procure
a satisfactory party or parties to purchase or agree to purchase such Bonds on
such terms within such period after the receipt of such notice, then the Company
shall be entitled to an additional period of 24 hours within which to procure
another party or parties to purchase or agree to purchase such Bonds on the
terms set forth in this Underwriting Agreement. In any such case, either the
Representative or the Company shall have the right to postpone the Closing Date
for a period not to exceed three full Business Days from the date determined as
provided in this Section 6(b), in order that the necessary changes in the
Registration Statement and the Prospectus and any other documents and
arrangements may be effected. If the Representative and the Company shall fail
to procure a satisfactory party or parties, as above provided, to purchase or
agree to purchase such Bonds, then this Underwriting Agreement shall terminate.
In the event of any such termination, the Company shall not be under any
liability to any Underwriter (except to the extent, if any, provided in Section
7(h) hereof), nor shall any Underwriter (other than an Underwriter who shall
have failed or refused to purchase Bonds without some reason sufficient to
justify, in accordance with the terms of this Underwriting Agreement, its
termination of its obligations under this Underwriting Agreement) be under any
liability to the Company. Nothing contained in this Section 6(b) shall release
any defaulting Underwriter from its liability to the Company for damages
occasioned by its default under this Underwriting Agreement.

        Section 7.  Covenants of the Company.  The Company agrees:
                    ------------------------
                       
               (a) To deliver to the Representative a signed copy of the
        registration statement relating to the Bonds as originally filed and of
        all amendments thereto or a conformed copy thereof certified by an
        officer of the Company to be in the form filed.

               (b) To deliver to the Underwriters, through the Representative,
        as many copies of the Prospectus, and any amendments or supplements
        thereto, as the Representative may reasonably request.

               (c) To cause the Prospectus, and any amendments or supplements
        thereto, to be filed with the Commission pursuant to Rule 424 as soon as
        practicable and advise the Representative promptly of the issuance of
        any stop order under the Securities Act with respect to the Registration
        Statement or the institution of any proceedings therefor of 

                                       5
<PAGE>
 
which the Company shall have received notice. The Company will use its best
efforts to prevent the issuance of any such stop order and to secure the prompt
removal thereof if issued.

               (d) During such period of time (not exceeding nine months) after
the Prospectus has been filed with the Commission pursuant to Rule 424 as the
Underwriters are required by law to deliver a prospectus relating to the Bonds,
if (i) any event relating to or affecting the Company or of which the Company
shall be advised in writing by the Representative shall occur as a result of
which in the Company's opinion the Prospectus, as then amended or supplemented,
would include an untrue statement of a material fact or omit to state a material
fact necessary to make the statements therein, in the light of the circumstances
under which they were made, not misleading or (ii) it shall be necessary to
amend or supplement the Registration Statement or the Prospectus to comply with
the Securities Act or the Exchange Act or in each case the rules and regulations
of the Commission thereunder, to amend or supplement the Prospectus or the
Registration Statement, as the case may be, by either (A) preparing and filing
with the Commission and furnishing to the Representative at the Company's
expense a reasonable number of copies of a supplement or supplements or an
amendment or amendments to the Prospectus or the Registration Statement, as the
case may be, or (B) making an appropriate filing pursuant to Section 13 or 14 of
the Exchange Act that will correct such statement or omission or effect such
compliance; provided, however, that should such event relate solely to the
activities of any of the Underwriters, then the Underwriters shall assume the
expense of preparing any such amendment or supplement. In case any Underwriter
is required to deliver a prospectus relating to the Bonds after the expiration
of nine months from the date the Prospectus is filed with the Commission
pursuant to Rule 424, the Company, upon the request of the Representative, will
furnish to the Representative, at the expense of such Underwriter, a reasonable
quantity of a supplemented or amended Prospectus or supplements or amendments to
the Prospectus complying with Section 10(a) of the Securities Act.

               (e) During such period of time after the date the Prospectus is
filed with the Commission pursuant to Rule 424 as a prospectus relating to the
Bonds is required to be delivered under the Securities Act, to file promptly all
documents required to be filed with the Commission pursuant to Section 13 or 14
of the Exchange Act.

               (f) To make generally available to its security holders, as soon
as practicable, an earning statement (which need not be audited) in reasonable
detail covering a period of at least twelve months beginning after the
"effective date of the registration statement" within the meaning of Rule 158
under the Securities Act, which earning statement shall be in such form, and be
made generally available to security holders in such a manner, so as to comply
with the requirements of Section 11(a) of the Securities Act and Rule 158
promulgated under the Securities Act.

               (g) At any time within six months after the date of this
Underwriting Agreement, to execute such documents, furnish such proper
information as may be lawfully required
                                       6
<PAGE>
 
        and otherwise cooperate in qualifying the Bonds for offer and sale under
        the blue-sky laws of such jurisdictions as the Representative may
        reasonably designate; provided, however, that the Company shall not be
        required to qualify as a foreign corporation or dealer in securities, to
        file any consents to service of process under the laws of any
        jurisdiction, or to meet any other requirements deemed by the Company to
        be unduly burdensome.

               (h) Except as herein otherwise provided, to pay all expenses and
        taxes (except transfer taxes) in connection with (i) the preparation and
        filing by it of the Registration Statement and all other documents
        prepared in order to carry out the transactions contemplated thereby,
        (ii) the issuance and delivery of the Bonds, (iii) the preparation,
        execution, filing and recording of the Supplemental Indenture, (iv) the
        qualification of the Bonds under the blue-sky laws of various
        jurisdictions up to a maximum qualification cost to it of $3,500, (v)
        the fees and disbursements of Counsel for the Underwriters in connection
        with the preparation of a blue-sky survey in connection with the Bonds
        and (vi) the printing and delivery to the Underwriters, through the
        Representative, of reasonable quantities of copies of the Registration
        Statement and the Prospectus, and any amendment or supplement thereto,
        except as otherwise provided in Section 7(d) hereof. The Company shall
        not, however, be required to pay any amount for any expenses of the
        Representative or any of the Underwriters, except that, if this
        Underwriting Agreement shall be terminated in accordance with the
        provisions of Section 8, 9 or 11 hereof, or if this Underwriting
        Agreement is terminated pursuant to Section 6(b) hereof and could have
        been terminated in accordance with the provisions of Section 8, 9 or 11
        hereof, the Company will reimburse the Representative for (A) the fee
        and disbursements of Counsel for the Underwriters, whose fee and
        disbursements the Underwriters agree to pay in any other event except to
        the extent set forth in clauses (iv) and (v) of the preceding sentence,
        and (B) their reasonable out-of-pocket expenses, in an amount not
        exceeding $10,000 incurred in contemplation of the performance of this
        Underwriting Agreement. The Company shall not in any event be liable to
        any of the Underwriters for damages on account of loss of anticipated
        profits.

               (i) Not to sell any additional First Mortgage Bonds (other than
        First Mortgage Bonds of one or more other series and having a maturity
        or maturities different from the date of maturity of the Bonds and with
        respect to which the Company shall have entered into a contract for sale
        on the same day as the date of this Underwriting Agreement) without the
        consent of the Representative until the earlier to occur of (i) the
        Closing Date and (ii) in the case of an initial reoffering at a fixed
        price by the Underwriters, the date of the termination of the fixed
        price offering restrictions applicable to the Underwriters. The
        Representative agrees to notify the Company of such termination if it
        occurs prior to the Closing Date.

        Section 8. Conditions of Underwriters' Obligations. The obligations of
                   ---------------------------------------
the Underwriters to purchase and pay for the Bonds shall be subject to the
accuracy of the representations and warranties made herein on the part of the
Company and to the following conditions:

                                       7
<PAGE>
 
               (a) The Prospectus, and any amendments or supplements thereto,
        shall have been filed with the Commission pursuant to Rule 424 prior to
        5:30 P.M., New York time, on the first Business Day after the date of
        this Underwriting Agreement or at such later time and date as may be
        approved by the Representative.

               (b) No stop order suspending the effectiveness of the
        Registration Statement shall be in effect at or prior to the Closing
        Date and at the Closing Date the Representative shall have received a
        certificate, dated the Closing Date and signed by an officer of the
        Company, to the effect that no such stop order has been or is in effect
        and that no proceedings for such purpose are pending before, or to the
        knowledge of the Company threatened by, the Commission.

               (c) Prior to 5:00 P.M., New York time, on the first day after the
        date of this Underwriting Agreement, or such later time and date as may
        be approved in writing from time to time by the Representative, there
        shall have been issued, and on the Closing Date there shall be in full
        force and effect, an appropriate order of the Missouri Public Service
        Commission authorizing the issuance and sale of the Bonds on the terms
        herein set forth or contemplated.

               (d) At the Closing Date, the Representative shall have received
        from Mary C. Kullman, Esq., Associate Counsel of the Company, and from
        Winthrop, Stimson, Putnam & Roberts, Counsel for the Underwriters,
        opinions (with a conformed copy of each for each of the Underwriters) in
        substantially the form and substance set forth in Exhibits A and B
        hereto, respectively, (i) with such changes therein as may be agreed
        upon by the Company and the Representative, with the approval of Counsel
        for the Underwriters; and (ii) if the Prospectus shall be supplemented
        after the Prospectus shall have been filed with the Commission pursuant
        to Rule 424, with changes therein to reflect such supplementation.

               (e) At or prior to the Closing Date, the Representative shall
        have received from Deloitte & Touche LLP a letter (with a conformed copy
        for each of the Underwriters) to the effect that (i) they are
        independent certified public accountants with respect to the Company
        within the meaning of the Securities Act and the applicable rules and
        regulations of the Commission thereunder; (ii) in their opinion, the
        consolidated financial statements audited by them and included or
        incorporated by reference in the Prospectus comply as to form in all
        material respects with the applicable accounting requirements of
        the Securities Act and the Exchange Act and in each case the rules and
        regulations of the Commission thereunder; (iii) on the basis of a
        reading of the latest available unaudited amounts of utility operating
        income and net income included or incorporated by reference in the
        Registration Statement and the related unaudited consolidated financial
        statements from which these amounts were derived, the latest available
        unaudited consolidated financial statements of the Company and its
        subsidiaries, the minutes of the meetings of the Board of Directors and
        the stockholders of the Company since the close of the most recent
        audited fiscal year to a specified date not more than five days prior to
        the Closing 

                                       8
<PAGE>
 
        Date, and inquiries of officers of the Company who have responsibility
        for financial and accounting matters (it being understood that the
        foregoing procedures do not constitute an examination made in accordance
        with generally accepted auditing standards and they would not
        necessarily reveal matters of significance with respect to the comments
        made in such letter, and accordingly that Deloitte & Touche LLP makes no
        representations as to the sufficiency of such procedures for the several
        Underwriters' purposes), nothing has come to their attention that caused
        them to believe that (A) any material modifications should be made to
        the unaudited consolidated financial statements included or incorporated
        by reference in the Prospectus for them to be in conformity with
        generally accepted accounting principles or any such consolidated
        financial statements do not comply with the applicable accounting
        requirements of the Securities Act or the Exchange Act or in each case
        the rules and regulations of the Commission thereunder and (B) during
        the period (1) from the date of the most recent consolidated balance
        sheet of the Company and its subsidiaries included or incorporated by
        reference in the Prospectus to a specified date not more than five days
        prior to the Closing Date, there was any change in the capital stock or
        long-term debt of the Company, or decrease in its net assets or (2)
        consisting of the twelve months ended as of the date of the Company's
        most recently available unaudited financial statements, there were any
        decreases as compared with the comparable period of the preceding year,
        in the Company's operating revenues, net income and earnings available
        for common stock, except in all instances for changes or decreases that
        the Prospectus discloses have occurred or may occur, for declarations of
        dividends, for the repayment of long-term debt, for the amortization of
        premium or discount on long-term debt, for the redemption or purchase of
        preferred stock for sinking fund purposes, or for changes or decreases
        as set forth in such letter, identifying the same and specifying the
        amount thereof; (iv) they have read the unaudited ratios of earnings to
        fixed charges and the most recent earnings coverage ratios included or
        incorporated by reference in the Prospectus containing such ratios and
        have found such ratios to be in agreement with the appropriate records
        of the Company and the computations to be arithmetically correct and (v)
        such other matters as the Representative may reasonably request are in
        form and substance reasonably satisfactory to the Representative.

               (f) At the Closing Date, the Representative shall have received a
        certificate, dated the Closing Date and signed by an officer of the
        Company, to the effect that since the most recent date as of which
        information is given in the Prospectus, there has not been any change in
        the business, properties or condition (financial or otherwise) of the
        Company except changes arising from transactions in the ordinary course
        of business, none of which alone or in the aggregate has had a material
        adverse effect on the business, properties or condition (financial or
        otherwise) of the Company, in each case other than as referred to in, or
        contemplated by, the Prospectus.

               (g) All legal proceedings to be taken in connection with the
        issuance and sale of the Bonds shall have been satisfactory in form and
        substance to Counsel for the Underwriters.

                                       9
<PAGE>
 
If any of the conditions specified in this Section 8 shall not have been
fulfilled, this Underwriting Agreement may be terminated by the Representative
with the consent of the Underwriters, who may include the Representative, which
have agreed to purchase in the aggregate 50% or more of the principal amount of
the Bonds, upon notice thereof to the Company. Any such termination shall be
without liability of any party to any other party, except as otherwise provided
in Section 7(h) hereof.

        Section 9. Conditions of Company's Obligations. The obligations of the
                   -----------------------------------
Company hereunder shall be subject to the following conditions:

               (a) The Prospectus, and any amendments or supplements thereto,
        shall have been filed with the Commission pursuant to Rule 424 prior to
        5:30 P.M., New York time, on the first Business Day after the date of
        this Underwriting Agreement, or such later time and date as may be
        approved by the Company.

               (b) No stop order suspending the effectiveness of the
        Registration Statement shall be in effect at or prior to the Closing
        Date, and no proceedings for that purpose shall be pending before, or
        threatened by, the Commission on the Closing Date.

               (c) Prior to 5:00 P.M., New York time, on the first day after the
        date of this Underwriting Agreement, or such later time and date as may
        be approved from time to time by the Company, there shall have been
        issued, and on the Closing Date there shall be in full force and effect,
        an appropriate order of the Missouri Public Service Commission
        authorizing the issuance and sale of the Bonds on the terms herein set
        forth or contemplated and containing no provision unacceptable to the
        Company by reason of the fact that it is, in the judgment of the
        Company, materially adverse to the Company, it being understood that no
        order heretofore issued contains any such unacceptable provision.

        In case any of the conditions specified in this Section 9 shall not have
been fulfilled, this Underwriting Agreement may be terminated by the Company
upon notice thereof to the Representative. Any such termination shall be without
liability of any party to any other party, except as otherwise provided in
Section 7(h) hereof.

        Section 10.  Indemnification.
                     ---------------
        
               (a) The Company shall indemnify, defend and hold harmless each
        Underwriter and each person who controls any Underwriter within the
        meaning of Section 15 of the Securities Act from and against any and all
        losses, claims, damages or liabilities, joint or several, to which they
        or any of them may become subject under the Securities Act or any other
        statute or common law and shall reimburse each such Underwriter and
        controlling person for any legal or other expenses (including, to the
        extent hereinafter provided, reasonable counsel fees) incurred by them
        in connection with investigating any such losses, claims, damages or
        liabilities or in connection with defending any actions, insofar as such
        losses, claims, damages, liabilities, expenses or actions arise out of
        or are based 

                                       10
<PAGE>
 
        upon any untrue statement or alleged untrue statement of a material fact
        contained in a preliminary prospectus relating to the Bonds, or in the
        Basic Prospectus (if used prior to the date the Prospectus is filed with
        the Commission pursuant to Rule 424), or in the Registration Statement
        or the Prospectus, as amended or supplemented (if any amendments or
        supplements thereto shall have been furnished), or in the Company's
        latest available Annual Report to Shareholders, to the extent portions
        thereof are incorporated by reference, directly or indirectly, in a
        preliminary prospectus relating to the Bonds, or in the Basic Prospectus
        (if used prior to the date the Prospectus is filed with the Commission
        pursuant to Rule 424), or in the Registration Statement or the
        Prospectus, or the omission or alleged omission to state therein a
        material fact required to be stated therein or necessary to make the
        statements therein in the light of the circumstances under which they
        were made not misleading; provided, however, that the indemnity
        agreement contained in this Section 10(a) shall not apply to any such
        losses, claims, damages, liabilities, expenses or actions arising out
        of, or based upon, any such untrue statement or alleged untrue
        statement, or any such omission or alleged omission, if such statement
        or omission was made in reliance upon and in conformity with written
        information furnished to the Company by or through the Representative on
        behalf of any Underwriter for use in connection with the preparation of
        the Registration Statement or the Prospectus or any amendment or
        supplement to either thereof, or arising out of, or based upon,
        statements in or omissions from that part of the Registration Statement
        that shall constitute the Statement of Eligibility on Form T-1 under the
        Trust Indenture Act of the trustee under the Mortgage; provided further,
        however, that the indemnity agreement contained in this Section 10(a)
        shall not inure to the benefit of any Underwriter or of any person
        controlling any Underwriter on account of any such losses, claims,
        damages, liabilities, expenses or actions arising from the sale of Bonds
        to any person if there shall not have been given or sent to such person
        on behalf of such Underwriter (i) with or prior to the written
        confirmation of the sale to such person, a copy of the Prospectus as
        then amended or supplemented (exclusive for this purpose of any
        amendment or supplement relating to any offering of First Mortgage Bonds
        that are not included in the Bonds and of any document incorporated by
        reference pursuant to Item 12 of Form S-3 under the Securities Act),
        unless the failure to so give or send resulted from the Company's
        failure to comply with Section 7(b) hereof, and (ii) as soon as
        available after such written confirmation, a copy of any amendment or
        supplement to the Prospectus (exclusive for this purpose of any document
        incorporated by reference pursuant to Item 12 of Form S-3 under the
        Securities Act) that the Company shall thereafter furnish, pursuant to
        Section 7(d) hereof, relating to an event occurring prior to the payment
        for and delivery to such person of the Bonds involved in such sale. The
        indemnity agreement of the Company contained in this section and the
        representations and warranties of the Company contained in Section 4
        hereof shall remain operative and in full force and effect regardless of
        any investigation made by or on behalf of any Underwriter or any such
        controlling person, and shall survive the delivery of the Bonds.

               (b) Each Underwriter shall indemnify, defend and hold harmless
        the Company, its directors and officers, and each person who controls
        any of the foregoing within the meaning of Section 15 of the Securities
        Act, from and against any and all losses, claims,

                                       11
<PAGE>
 
        damages or liabilities, joint or several, to which they or any of them
        may become subject under the Securities Act or any other statute or
        common law and shall reimburse each of them for any legal or other
        expenses (including, to the extent hereinafter provided, reasonable
        counsel fees) incurred by them in connection with investigating any such
        losses, claims, damages or liabilities or in connection with defending
        any action, insofar as such losses, claims, damages, liabilities,
        expenses or actions arise out of or are based upon any untrue statement
        or alleged untrue statement of a material fact contained in the
        Registration Statement or the Prospectus, as amended or supplemented (if
        any amendments or supplements thereto shall have been furnished), or the
        omission or alleged omission to state therein a material fact required
        to be stated therein or necessary to make the statements therein not
        misleading, if such statement or omission was made in reliance upon and
        in conformity with written information furnished to the Company by or
        through the Representative on behalf of such Underwriter for use in
        connection with the preparation of the Registration Statement or the
        Prospectus or any amendment or supplement to either thereof. The
        indemnity agreement of the respective Underwriters contained in this
        Section 10(b) shall remain operative and in full force and effect
        regardless of any investigation made by or on behalf of the Company, its
        directors or officers, any such Underwriter, or any such controlling
        person, and shall survive the delivery of the Bonds.

               (c) The Company and the several Underwriters each shall, upon the
        receipt of notice of the commencement of any action against it or any
        person controlling it as aforesaid, in respect of which indemnity may be
        sought on account of any indemnity agreement contained herein, promptly
        give written notice of the commencement thereof to the party or parties
        against whom indemnity shall be sought hereunder, but the omission so to
        notify the indemnifying party or parties of any such action shall not
        relieve such indemnifying party or parties from any liability that it or
        they may have to the indemnified party under such indemnity agreement
        except to the extent that it has or they have been prejudiced in any
        material respect by such omission or from any liability that it or they
        may have to such indemnified party otherwise than on account of such
        indemnity agreement. In case such notice of any such action shall be so
        given, any such indemnifying party shall be entitled to participate at
        its own expense in the defense or, if it so elects, to assume (in
        conjunction with any of such other indemnifying parties) the defense of
        such action, in which event such defense shall be conducted by counsel
        chosen by such indemnifying party or parties and satisfactory to the
        indemnified party or parties, in its or their reasonable judgment, who
        shall be defendant or defendants in such action, and such indemnified
        party or parties shall bear the fees and expenses of any additional
        counsel retained by it or them; provided, however, that if any such
        indemnifying party shall elect not to assume the defense of such action,
        such indemnifying party will reimburse such indemnified party or parties
        for the reasonable fees and expenses of any counsel retained by such
        indemnified party or parties; provided further, however, that if the
        defendants in any such action include both such indemnifying party or
        parties and such indemnified party or parties, then, at the request of
        such indemnified party or parties, such indemnifying and indemnified
        party or parties shall mutually select special counsel (whose fees and
        disbursements shall be shared equally by such indemnifying and

                                       12
<PAGE>
 
        indemnified party or parties) for the sole purpose of determining if a
        conflict of interest is or may be involved if the same counsel were to
        represent both such indemnifying party or parties and such indemnified
        party or parties and, if such special counsel determines that such a
        conflict does or may exist, such indemnified party or parties shall have
        the right to select separate counsel satisfactory to such indemnifying
        party or parties to participate in the defense of such action on behalf
        of such indemnified party or parties (it being understood, however, that
        such indemnifying party or parties shall not be liable for the expenses
        of more than one separate counsel representing such indemnified party or
        parties who are parties to such action plus any local counsel retained
        by such indemnified party or parties in its or their reasonable
        judgment). Notwithstanding the foregoing, such indemnifying party or
        parties shall not be liable for any settlement of any action or claim
        effected without its or their consent, which consent shall not be
        unreasonably withheld.

        Section 11. Termination. This Underwriting Agreement may be terminated
                    -----------
at any time prior to the Closing Date by the Representative with the consent of
Underwriters, who may include the Representative, which have agreed to purchase
in the aggregate 50% or more of the principal amount of the Bonds, if, prior to
such time, (i) trading in securities on the New York Stock Exchange shall have
been generally suspended, (ii) minimum or maximum ranges for prices shall have
been generally established on the New York Stock Exchange by the New York Stock
Exchange, the Commission or other governmental authority, (iii) a general
banking moratorium shall have been declared by federal or New York State
authorities, (iv) there shall have been any downgrading in the rating of any
debt securities of the Company by any "nationally recognized statistical rating
organization" (as defined for purposes of Rule 436(g) under the Securities Act),
or any public announcement that any such organization has under surveillance or
review its rating of any debt securities of the Company (other than an
announcement with positive implications of a possible upgrading and no
implication of a possible downgrading of such rating), (v) there shall have
occurred any outbreak of hostilities, or escalation thereof, or other national
or international calamity or crisis, the effect of which on the financial
markets of the United States shall be such as to make it impracticable or
inadvisable for the Underwriters in the reasonable judgment of the
Representative to proceed with the public offering or the delivery of the Bonds
on the terms and in the manner contemplated by the Prospectus, (vi) there shall
have occurred any change, or any development involving a prospective change, in
or affecting the business or properties of the Company the effect of which
is, in the reasonable judgment of the Representative, so material and adverse as
to make it impractical or inadvisable to proceed with the delivery of the Bonds
or (vii) in the reasonable judgment of the Representative, the subject matter of
any amendment or supplement (prepared by the Company) to the registration
statement relating to the Bonds, the Basic Prospectus, the Registration
Statement or the Prospectus (except for information relating to the public
offering of the Bonds or to the activity of any Underwriter or Underwriters)
filed or issued after the effectiveness of this Underwriting Agreement by the
Company shall have materially impaired the marketability of the Bonds. Any
termination hereof pursuant to this Section 11 shall be without liability of any
party to any other party, except as otherwise provided in Section 7(h) hereof.

                                       13
<PAGE>
 
        Section 12. Miscellaneous. This Underwriting Agreement shall be a New
                    -------------
York contract and its validity and interpretation shall be governed by the law
of the State of New York. This Underwriting Agreement shall inure to the benefit
of the Company, the Underwriters (including any parties referred to in Section
6(b) hereof) and, with respect to the provisions of Section 10 hereof, such
parties and each director, officer and controlling person described in Section
10 hereof, and their respective successors. Nothing herein is intended or shall
be construed to give to any other person, firm or corporation any legal or
equitable right, remedy or claim under or in respect of any provision in this
Underwriting Agreement. The term "successor" as used in this Underwriting
Agreement shall not include any purchaser, as such purchaser, of any of the
Bonds from any of the Underwriters.

        Section 13. Notices. All communications hereunder shall be in writing
                    -------
and, if to the Underwriters, shall be mailed or delivered, or sent by telex or
facsimile transmission confirmed in writing, to the Representative at the
address set forth below, or, if to the Company, shall be mailed or delivered, or
sent by telex or facsimile transmission confirmed in writing, to it c/o
Winthrop, Stimson, Putnam & Roberts, One Battery Park Plaza, New York, New York
10004-1490, Attention: Todd W. Eckland, Esq., with a copy to Laclede Gas
Company, 720 Olive Street, St. Louis, Missouri 63101, Attention: Office of the
General Counsel.

                                       14
<PAGE>
 
        If this Underwriting Agreement, and the interest rate to be borne by the
Bonds and the price to be paid to the Company (as set forth in Schedule II
hereto), are in accordance with your understanding of our agreement, please
indicate your acceptance thereof in the space provided below for that purpose,
whereupon this letter and your acceptance shall constitute a binding agreement
between the Company and the several Underwriters in accordance with its terms.
We have submitted this Underwriting Agreement in duplicate with Schedules I and
II filled in.

                                    Very truly yours,

                                    By __________________________

                                    As Representative of the
                                      Underwriters

                                    By __________________________

                                    By __________________________

                                    Address of Representative:




The foregoing Underwriting Agreement is 
hereby accepted as of the date set 
forth  below.

LACLEDE GAS COMPANY



By __________________

Dated: October 16, 1997

                                       15
<PAGE>
 
                                  SCHEDULE I

                                                                       Principal
                                                                         Amount
Name of Underwriter                                                    of Bonds
- -------------------                                                    ---------

ABN AMRO Chicago Corporation.........................................$25,000,000

        Total........................................................$25,000,000
<PAGE>
 
                                  SCHEDULE II

                               Form of Proposal
                              for the Purchase of
                   $25,000,000 Aggregate Principal Amount of
                             First Mortgage Bonds,
                      6 1/2% Series due October 15, 2012
                      Laclede Gas Company (the "Company")

                            ----------------------


Stated interest rate (a multiple of
  1/8th of 1%):   6 1/2% per annum

Price to the Company (must be within range
  designated by the Company in its letter to the
  prospective Underwriters):  98.356% of the principal
  amount of the Bonds plus accrued interest from October 15, 1997.
<PAGE>
 
                                                                       EXHIBIT A
                                                                       ---------
                      [Opinion of Mary C. Kullman, Esq.]

                          [Letterhead of the Company]

                               October __, 1997

[Name and address of Representative]

As Representative of the several Underwriters
  (as defined in the Underwriting Agreement
  referred to below)

Ladies and Gentlemen:

        I am Associate Counsel of Laclede Gas Company (the "Company") and have
acted in that capacity in connection with the issuance and sale by the Company
pursuant to the Underwriting Agreement dated October 16, 1997 (the "Underwriting
Agreement") between the Company and the several Underwriters, for whom you are
designated as Representative, of $25,000,000 aggregate principal amount of its
First Mortgage Bonds, 6 1/2% Series due October 15, 2012 (the "Bonds") issued
under the Company's Mortgage and Deed of Trust, dated as of February 1, 1945, to
State Street Bank and Trust Company of Missouri, N.A. (who is now acting, under
the terms of said Mortgage and Deed of Trust, in place of Mississippi Valley
Trust Company), as trustee (the "Trustee"), as supplemented and amended by all
indentures supplemental thereto, including the Twenty-Third Supplemental
Indenture, dated as of October 15, 1997 (the "Twenty-Third Supplemental
Indenture") (the Mortgage and Deed of Trust as so supplemented and amended being
hereinafter referred to as the "Mortgage").

        I am familiar with the Articles of Incorporation, as amended, and the 
By-Laws, as currently in effect, of the Company and the records of various
corporate and other proceedings relating to the authorization, issuance and sale
of the Bonds. I have participated in the preparation of (a) the Twenty-Third
Supplemental Indenture and (b) the Underwriting Agreement; and I am familiar
with the Registration Statement and the Prospectus (such terms having the same
meaning herein as in the Underwriting Agreement) filed under the Securities
<PAGE>
 
Act of 1933, as amended (the "Securities Act"), with the Securities and Exchange
Commission (the "Commission") with respect to the issuance and sale of the
Bonds.

        I have examined the Annual Report on Form 10-K of the Company for the
fiscal year ended September 30, 1996 (the "Annual Report") and the Quarterly
Reports on Form 10-Q of the Company for the quarterly periods ended December 31,
1996, March 31, 1997, and June 30, 1997 (the "Exchange Act Documents"), each as
filed with the Commission under the Securities Exchange Act of 1934, as amended
(the "Exchange Act"), and deemed to be incorporated by reference in the
Prospectus.

        I have examined a copy of an order dated April 21, 1993, from the
Commission to the Company relating to the effectiveness of the Registration
Statement and the qualification of the Mortgage under the Trust Indenture Act of
1939, as amended (the "Trust Indenture Act"). I have also examined such other
documents and satisfied myself as to such other matters as I have deemed
necessary to render this opinion. In the course of such examination, I have
assumed the genuineness of all signatures, the legal capacity of natural
persons, the authenticity of all documents submitted to me as originals, the
conformity to original documents of all documents submitted to me as certified
or photostatic copies, and the authenticity of the originals of such latter
documents. I have also relied upon information submitted to me by certain
officers of the Company with respect to the existence or non-existence of
certain facts that form the basis for the opinions set forth herein. Although I
have not conducted any independent investigations of the accuracy of various of
the matters covered by such information supplied by officers of the Company, I
have no reason to believe that any of the matters covered thereby are
inaccurate. I have also relied on certain documents, instruments and
certificates of public officials. I have not examined the Bonds, except a
specimen thereof, and have relied upon a certificate of the Trustee as to the
authentication thereof. Upon the basis of my familiarity with the foregoing and
with the Company's properties and affairs generally, and as limited by the
foregoing qualifications and limitations, I am of the opinion that:

        1. The Company is a corporation duly organized and validly existing
under the laws of the State of Missouri.

        2. The Company is a public utility corporation, is duly authorized by
its Articles of Incorporation, as amended, to conduct the utility business that
it is described in the Prospectus as conducting, and, by virtue of its
possession of valid and subsisting licenses, franchises and permits, and its
compliance with the laws of the State of Missouri, is duly authorized to conduct
such business in that State. In this regard, it should be noted that the Company
will seek to renew its franchise in Florissant, Missouri, which franchise
expired in 1992; and that, since that time, the Company has continued to provide
service in that community without a formal franchise.

        3. The Company has good and sufficient title to the properties described
as owned by it in and as subject to the lien of the Mortgage, subject only to
excepted encumbrances as defined in the Mortgage, and to minor defects and
encumbrances customarily found in properties of like size and character that do
not materially impair the use of such properties by

                                       2
<PAGE>
 
the Company. Subject to paragraph 4 hereof, the description of such properties
set forth in the Mortgage is adequate to constitute the Mortgage a lien thereon
and the Mortgage, subject only to minor defects and encumbrances and excepted
encumbrances of the character aforesaid, constitutes a valid, direct and first
mortgage lien upon such properties, which include substantially all of the
permanent physical properties and franchises of the Company (other than those
expressly excepted in the Mortgage). All permanent physical properties and
franchises (other than those expressly excepted in or released from the
Mortgage) that have been or hereafter may be acquired by the Company after the
date of the Twenty-Third Supplemental Indenture have become or, upon such
acquisition, will become subject to the lien of the Mortgage, subject, however,
to liens, defects and encumbrances, if any, existing or placed thereon at the
time of the acquisition thereof by the Company and except as limited by
bankruptcy law. This opinion, insofar as it relates to the matters set forth in
this paragraph 3 and in paragraph 4 hereof, is, in addition to being subject to
excepted encumbrances as defined in the Mortgage, in all respects: (a) subject
to the fact that the Company's leasehold interest in its general offices located
at 720 Olive Street, St. Louis, Missouri is subordinated to certain liens and
deeds of trust; (b) subject to minor defects of title and to prior encumbrances
of minor importance upon certain of the properties in which the Company has
acquired gas storage easements, leases, and oil and other rights in the
Company's underground gas storage area, which have no materially adverse effect
on the Company's storage of gas; and (c) subject to defects of title with
respect to certain real estate of minor importance acquired by the Company since
February 1, 1945.

        4. The Twenty-Third Supplemental Indenture has been recorded in the
office of the Secretary of State of the State of Missouri pursuant to Section
443.451 of the Missouri Revised Statutes, and the liens created by the Twenty-
Third Supplemental Indenture have become effective as to and enforceable against
third parties. All permanent physical properties and franchises of the Company
(other than those expressly excepted in or released from the Mortgage) presently
owned by the Company are subject to the lien of the Mortgage, subject to minor
defects and encumbrances, excepted encumbrances of the character referred to in
paragraph 3 hereof, and subject to the last sentence of paragraph 3 hereof.

        5. The Mortgage has been duly and validly authorized by all necessary
corporate action of the Company, has been duly and validly executed and
delivered by the Company, and is a valid and binding instrument enforceable
against the Company in accordance with its terms, assuming the due
authorization, execution and delivery thereof by the Trustee and except as the
same may be limited by certain laws and judicial decisions of the United States
of America and the State of Missouri (where the property covered thereby is
located) affecting the remedies for the enforcement of the security provided for
therein, which laws do not, in my opinion, make inadequate the remedies
necessary for the realization of the benefits of such security, and subject to
the effects of bankruptcy, insolvency, fraudulent conveyance, reorganization,
moratorium and other similar laws relating to or affecting creditors' rights
generally, general equity principles (whether considered in a proceeding in
equity or at law) and an implied covenant of good faith and fair dealing. The
Mortgage has been duly qualified under the Trust Indenture Act.

                                       3
<PAGE>
 
        6. The statements made in the Prospectus under the captions "Description
of New Bonds" and "Supplemental Description of New Bonds," insofar as they
purport to constitute summaries of the terms of documents referred to therein,
constitute accurate summaries of the terms of such documents in all material
respects.

        7. The Bonds have been duly authorized by the Company and, assuming due
authentication thereof by the Trustee and upon payment therefor and delivery
thereof in accordance with the Underwriting Agreement, subject to the
qualifications in paragraph 5 above, will constitute valid and legally binding
obligations of the Company enforceable against the Company in accordance with
their terms and entitled to the benefit and security of the Mortgage equally and
ratably (except as set forth in the Bonds) with the bonds of other series now
outstanding under the Mortgage.

        8. The Underwriting Agreement has been duly authorized, executed and
delivered by the Company.

        9. The Registration Statement has become and is effective under the
Securities Act; and, to the best of my knowledge, no proceedings for a stop
order with respect thereto are pending or threatened under Section 8(d) of the
Securities Act.

        10. The Missouri Public Service Commission has issued an appropriate
order authorizing, to the extent, in my opinion, such authorization is
necessary, the execution and delivery of the Underwriting Agreement by the
Company and no other approval or consent of any governmental body (other than in
connection or compliance with the provisions of the securities or blue-sky laws
of any jurisdiction) is required for the execution and delivery of the
Underwriting Agreement by the Company.

        I have not independently verified the accuracy, completeness or fairness
of the statements made or included in the Registration Statement, the Prospectus
or the Exchange Act Documents and take no responsibility therefor, except
insofar as such statements relate to me and as and to the extent expressly set
forth herein. In the course of the preparation of the Registration Statement and
the Prospectus, the Company's legal department (the "Legal Department")
participated in conferences with certain of the Company's officers and
employees, with representatives of Deloitte & Touche LLP, the independent
accountants for the Company, and with your representatives and counsel. Based on
my examination of the Registration Statement and the Prospectus, and the
investigations made in connection with the preparation of the Registration
Statement and the Prospectus and the Legal Department's participation in the
conferences referred to above, (i) I am of the opinion that the Registration
Statement, as of the date it was declared effective by the Commission, and the
Prospectus, as of the date it was filed with the Commission pursuant to Rule
424(b) under the Securities Act, complied as to form in all material respects
with the requirements of the Securities Act and the Trust Indenture Act and
in each case the applicable rules and regulations of the Commission thereunder
and that the Exchange Act Documents complied as to form when filed in all
material respects with the requirements of the Exchange Act and the applicable
rules and regulations of the Commission thereunder, except that in each case I
express no opinion with respect to the financial statements 

                                       4
<PAGE>
 
or other financial or statistical data contained or incorporated by reference in
the Registration Statement, the Prospectus or the Exchange Act Documents, and
(ii) I have no reason to believe that the Registration Statement, as of the date
the Annual Report was filed with the Commission under the Exchange Act,
contained an untrue statement of a material fact or omitted to state a material
fact required to be stated therein or necessary in order to make the statements
therein not misleading or that the Prospectus, as of the date hereof, includes
any untrue statement of a material fact or omits to state a material fact
necessary in order to make the statements made therein, in the light of the
circumstances under which they were made, not misleading, except that in each
case I express no opinion or belief with respect to the financial statements or
other financial or statistical data contained or incorporated by reference in
the Registration Statement, the Prospectus or the Exchange Act Documents.

        In passing upon the form of the Registration Statement, the form of the
Prospectus and the form of the Exchange Act Documents, I necessarily assume the
correctness and completeness of the statements made by the Company and
information included therein and take no responsibility therefor, except insofar
as such statements relate to me and as set forth in paragraph 6 above.

        I have examined the portions of the information contained in the
Registration Statement that are stated therein to have been made on my authority
and, upon my review thereof, I believe such information to be correct. I have
also examined the opinion of even date herewith rendered to you by Winthrop,
Stimson, Putnam & Roberts, and I concur in the conclusions expressed therein
insofar as they involve questions of Missouri law.

        I am also delivering this opinion to Winthrop, Stimson, Putnam &
Roberts, who is entitled to rely upon this opinion to the same extent as if such
opinion were addressed to such firm. This opinion is rendered to Winthrop,
Stimson, Putnam & Roberts and you in connection with the above-described
transaction. This opinion may not be relied upon by Winthrop, Stimson, Putnam &
Roberts or you for any other purpose, or relied upon by or furnished to any
other person, firm or corporation (except for the other several Underwriters),
without my prior written consent.



                                            Very truly yours,

                                       5
<PAGE>
 
                                                                       EXHIBIT B
                                                                       ---------
                 [Letterhead of Counsel for the Underwriters]

                               October __, 1997

[Name and address of Representative]

As Representative of the several Underwriters
  (as defined in the Underwriting Agreement
  referred to below)

Ladies and Gentlemen:

We have acted as your counsel in connection with the issuance and sale by
Laclede Gas Company (the "Company") of $25,000,000 aggregate principal amount of
the Company's First Mortgage Bonds, 6 1/2% Series due October 15, 2012 (the
"Bonds"), which have been issued under the Company's Mortgage and Deed of Trust,
dated as of February 1, 1945, State Street Bank and Trust Company of Missouri,
N.A. (formerly Mississippi Valley Trust Company), as trustee (the "Trustee"), as
supplemented and amended by all indentures supplemental thereto, including the
Twenty-Third Supplemental Indenture dated as of October 15, 1997 (such Mortgage
and Deed of Trust, as so amended and supplemented, being hereinafter referred to
as the "Mortgage"), pursuant to the Underwriting Agreement dated October 16,
1997 between the several Underwriters and the Company (the "Underwriting
Agreement"). The terms "Registration Statement" and "Prospectus" as used herein
have the same meanings as when used in the Underwriting Agreement.
<PAGE>
 
        We have examined the Registration Statement and the Prospectus, which
pursuant to Form S-3 under the Securities Act of 1933, as amended (the
"Securities Act"), is deemed to incorporate by reference the Annual Report on
Form 10-K of the Company for the fiscal year ended September 30, 1996 (the
"Annual Report") and the Quarterly Reports on Form 10-Q of the Company for the
quarterly periods ended December 31, 1996, March 31, 1997, and June 30, 1997
(the "Exchange Act Documents"), each as filed with the Securities and Exchange
Commission (the "Commission") under the Securities Exchange Act of 1934, as
amended (the "Exchange Act"). In addition, we have examined, and have relied as
to matters of fact upon, the documents delivered to you at the closing (except
the Bonds, of which we have examined a specimen), and upon originals or copies,
certified or otherwise identified to our satisfaction, of such corporate
records, agreements, documents and other instruments and such certificates or
comparable documents of public officials and of officers and representatives of
the Company, and have made such other and further investigations as we have
deemed relevant and necessary as a basis for this opinion.

        In such examination, we have assumed the genuineness of all signatures,
the legal capacity of natural persons, the authenticity of all documents
submitted to us as originals, the conformity to original documents of all
documents submitted to us as certified or photostatic copies, and the
authenticity of the originals of such latter documents.

        With respect to legal matters governed by the laws of the State of
Missouri, we understand that you are relying upon the opinion of Mary C.
Kullman, Esq., Associate Counsel of the Company, of even date, addressed to you.
We believe that such opinion is satisfactory in form and that you are justified
in relying thereon and we, on our part, have relied solely on said opinion as to
such matters. We do not pass upon legal matters regarding title to the
properties of the Company, franchises and permits of the Company, the
description of such properties in the Mortgage, the nature and extent of the
lien of the Mortgage, the absence of liens and encumbrances prior to the lien of
the Mortgage or the recordation or filing of the Mortgage, as to which we
understand you are relying upon the aforesaid opinion of Ms. Kullman.

        Based upon the foregoing and subject to the qualifications and
limitations stated herein, we hereby advise you that in our opinion:

        1. The Company had full power and authority to execute the Mortgage, and
the Mortgage has been duly authorized, executed and delivered by the Company,
has been qualified under the Trust Indenture Act of 1939, as amended (the "Trust
Indenture Act"), and, assuming due authorization, execution and delivery thereof
by the Trustee, constitutes a valid and legally binding instrument enforceable
against the Company in accordance with its terms, except as the same may be
limited by the law of the State of Missouri (where the property covered thereby
is located) affecting the remedies for the enforcement of the security provided
for therein, by bankruptcy, insolvency, fraudulent conveyance, reorganization,
moratorium and other similar laws relating to or affecting creditors' rights
generally, by general equity principles (regardless of whether enforceability is
considered in a proceeding in equity or at law) and by an implied covenant of
good faith and fair dealing.

                                       2
<PAGE>
 
        2. The statements made in the Prospectus under the captions "Description
of New Bonds" (other than under the heading "Priority and Security," as to which
we express no opinion) and "Supplemental Description of New Bonds," insofar as
they purport to constitute summaries of the terms of documents referred to
therein, constitute accurate summaries of the terms of such documents in all
material respects.

        3. The Bonds have been duly authorized by the Company and, assuming due
authentication by the Trustee and upon payment and delivery in accordance with
the Underwriting Agreement, subject to the qualifications in paragraph 1 above,
will constitute valid and legally binding obligations of the Company enforceable
against the Company in accordance with their terms and entitled to the benefit
and security of the Mortgage equally and ratably (except as set forth in the
Bonds) with the bonds of other series now outstanding under the Mortgage.

        4. The Underwriting Agreement has been duly authorized, executed and
delivered by the Company.

        5. The Registration Statement has become and is effective under the
Securities Act; and, to the best of our knowledge, no proceedings for a stop
order with respect thereto are pending or threatened under Section 8(d) of the
Securities Act.

        6. The Missouri Public Service Commission has issued an appropriate
order authorizing, to the extent, in our opinion, such authorization is
necessary, the execution and delivery of the Underwriting Agreement by the
Company and no other approval or consent of any Federal or Missouri governmental
body is required for the execution and delivery of the Underwriting Agreement by
the Company. 

        We have not independently verified the accuracy, completeness or
fairness of the statements made or included in the Registration Statement, the
Prospectus or the Exchange Act Documents and take no responsibility therefor,
except insofar as such statements relate to us and as and to the extent set
forth herein. In the course of the preparation by the Company of the
Registration Statement and the Prospectus (excluding the Exchange Act
Documents), we participated in conferences with certain of its officers and
employees, with counsel for the Company, with representatives of Deloitte &
Touche LLP, the independent accountants who examined certain of the Exchange Act
Documents, and with your representatives. We did not prepare the Exchange Act
Documents. Based on our examination of the Registration Statement, the
Prospectus and the Exchange Act Documents, our investigations made in connection
with the preparation of the Registration Statement and the Prospectus (excluding
the Exchange Act Documents) and our participation in the conferences referred to
above, (i) we are of the opinion that the Registration Statement, as of the date
it was declared effective by the Commission, and the Prospectus, as of the date
it was filed with the Commission pursuant to Rule 424(b) under the Securities
Act, complied as to form in all material respects with the requirements of the
Securities Act and the Trust Indenture Act and in each case the applicable rules
and regulations of the Commission thereunder, except that in each case we
express no opinion with respect to the financial statements or other financial
or statistical data contained or incorporated by reference in

                                       3
<PAGE>
 
the Registration Statement, the Prospectus or the Exchange Act Documents, and
(ii) we have no reason to believe that the Registration Statement, as of the
date the Annual Report was filed with the Commission under the Exchange Act,
contained an untrue statement of a material fact or omitted to state a material
fact required to be stated therein or necessary to make the statements therein
not misleading or that the Prospectus, as of the date hereof, includes any
untrue statement of a material fact or omits to state a material fact necessary
in order to make the statements made therein, in the light of the circumstances
under which they were made, not misleading, except that in each case we express
no opinion or belief with respect to the financial statements or other financial
or statistical data contained or incorporated by reference in the Registration
Statement, the Prospectus or the Exchange Act Documents.

        In passing upon the form of the Registration Statement and the form of
the Prospectus, we necessarily assume the correctness and completeness of the
statements made by the Company and information contained or incorporated by
reference therein and take no responsibility therefor, except insofar as such
statements relate to us and as set forth in paragraph 2 above.

        We are members of the Bar of the State of New York and we do not express
any opinion herein concerning any law other than the law of the State of New
York, the Federal laws of the United States and, to the extent set forth herein,
the law of the State of Missouri.

        This opinion is rendered to you in connection with the above-described
transaction. This opinion may not be relied upon by you for any other purpose,
or relied upon by or furnished to any other person, firm or corporation (except
for the other several Underwriters), without our prior written consent.


                                    Very truly yours,

                                       4

<PAGE>
 

                                                                EXHIBIT 4.01
- --------------------------------------------------------------------------------
- --------------------------------------------------------------------------------
 
                              LACLEDE GAS COMPANY
                                       TO
             STATE STREET BANK AND TRUST COMPANY OF MISSOURI, N.A.
                                    TRUSTEE
                               ----------------
                      TWENTY-THIRD SUPPLEMENTAL INDENTURE
                          DATED AS OF OCTOBER 15, 1997
                               ----------------
                              FIRST MORTGAGE BONDS
                       6 1/2% SERIES DUE OCTOBER 15, 2012
 
- --------------------------------------------------------------------------------
- --------------------------------------------------------------------------------
<PAGE>
 
                               TABLE OF CONTENTS
 
<TABLE>
<CAPTION>
                                                                            PAGE
                                                                            ----
 <C>          <S>                                                           <C>
 Parties...................................................................   1
 Recitals..................................................................   1
    Previous Indentures....................................................   1
    Identity of the Company................................................   7
    Identity of Trustee....................................................   7
    Outstanding Bonds......................................................   7
    Form of Fully Registered Bond..........................................   7
    Form of Trustee's Certificate of Authentication Compliance with legal
     requirements..........................................................  10
 Granting Clause...........................................................  10
 Exception Clause..........................................................  11
 Habendum Clause...........................................................  11
 Exceptions, Reservations, etc. ...........................................  11
 Grant in trust............................................................  11
 Covenant Clause...........................................................  12
 
                                   Article I
 
                                  Definitions
 
 Section 1.1  Terms defined by reference..................................   12
 Section 1.2  Trustee.....................................................   12
 Section 1.3  Original Indenture..........................................   12
 Section 1.4  First Supplemental Indenture................................   12
 Section 1.5  Second Supplemental Indenture...............................   12
 Section 1.6  Third Supplemental Indenture................................   12
 Section 1.7  Fourth Supplemental Indenture...............................   12
 Section 1.8  Fifth Supplemental Indenture................................   12
 Section 1.9  Sixth Supplemental Indenture................................   12
 Section 1.10 Seventh Supplemental Indenture..............................   12
 Section 1.11 Eighth Supplemental Indenture...............................   12
 Section 1.12 Ninth Supplemental Indenture................................   12
 Section 1.13 Tenth Supplemental Indenture................................   12
 Section 1.14 Eleventh Supplemental Indenture.............................   12
 Section 1.15 Twelfth Supplemental Indenture..............................   12
 Section 1.16 Thirteenth Supplemental Indenture...........................   13
 Section 1.17 Fourteenth Supplemental Indenture...........................   13
 Section 1.18 Fifteenth Supplemental Indenture............................   13
 Section 1.19 Sixteenth Supplemental Indenture............................   13
 Section 1.20 Seventeenth Supplemental Indenture..........................   13
 Section 1.21 Eighteenth Supplemental Indenture...........................   13
 Section 1.22 Nineteenth Supplemental Indenture...........................   13
 Section 1.23 Twentieth Supplemental Indenture............................   13
 Section 1.24 Twenty-First Supplemental Indenture.........................   13
 Section 1.25 Twenty-Second Supplemental Indenture........................   13
 Section 1.26 The Mortgage................................................   13
 Section 1.27 Hereof, hereunder, etc. ....................................   13
 Section 1.28 2012 Series.................................................   13
</TABLE>
 
                                      (i)
<PAGE>
 
                                   Article II
 
Creation, Description, Registration, Transfer and Exchange ofThe 2012 Series of
                                     Bonds
 
<TABLE>
<CAPTION>
                                                                            PAGE
                                                                            ----
 <C>         <S>                                                            <C>
 Section 2.1 Creation and principal amount of the 2012 Series.............   13
 Section 2.2 Date of Bonds................................................   14
 Section 2.3 Denominations, etc...........................................   14
 Section 2.4 Exchange of Bonds............................................   14
 Section 2.5 Registration of Bonds........................................   14
 Section 2.6 Temporary Bonds..............................................   14
 Section 2.7 Payment of Defaulted Interest................................   14
 Section 2.8 Transfers or Exchanges of Bonds called for redemption........   14
 
                                  Article III
 
                     Redemption of Bonds of The 2012 Series
 
 Section 3.1 Circumstances in which redeemable and Redemption Price.......   15
 Section 3.2 Notice of intention to redeem................................   15
 
                                   Article IV
 
                      Particular Covenants of The Company
 
 Section 4.1 Maintenance and Improvement Fund.............................   15
 Section 4.2 Restrictions as to dividends.................................   15
 Section 4.3 Earnings requirements for additional Bonds...................   16
 Section 4.4 Postponement of interest.....................................   17
 
                                   Article V
 
                                 Miscellaneous
 
 Section 5.1 Payments due on Sundays and holidays.........................   17
 Section 5.2 Provisions required by Trust Indenture Act of 1939 to
             control......................................................   17
 Section 5.3 Acceptance of Trust..........................................   17
 Section 5.4 This Indenture part of Original Indenture....................   17
 Section 5.5 Execution in any number of counterparts......................   17
 Section 5.6 Date of execution............................................   17
</TABLE>
 
 
                                      (ii)
<PAGE>
 
  Twenty-third Supplemental Indenture, dated as of the 15th day of October,
1997 between Laclede Gas Company, a corporation duly organized and existing
under the laws of the State of Missouri, having its principal place of
business at 720 Olive Street, St. Louis, Missouri 63101, hereinafter sometimes
called the "Company", party of the first part, and State Street Bank and Trust
Company of Missouri, N.A., a national banking association organized under the
laws of the United States, having its principal place of business at One
Metropolitan Square, St. Louis, Missouri 63101, hereinafter sometimes called
the "Trustee", party of the second part.
 
  Whereas, there have heretofore been duly executed and delivered the
following four indentures between the Company and Mississippi Valley Trust
Company, to-wit:
 
    (a) An indenture of mortgage and deed of trust, hereinafter sometimes
  called the "Original Indenture," dated as of February 1, 1945, which is
  recorded in the office of the Recorder of Deeds of the City of St. Louis,
  Missouri, in Book 6324 at Page 93 and in the office of the Recorder of
  Deeds of St. Louis County, Missouri, in Book 2078 at Page 12 and in the
  office of the Recorder of Deeds of Boone County, Missouri, in Book 294 at
  Page 399 and in the office of the Recorder of Deeds of Jefferson County,
  Missouri, in Book 434 at Page 480 and in the office of the Recorder of
  Deeds of St. Francois County, Missouri, in Book 551 at Page 593 and in the
  office of the Recorder of Deeds of Ste. Genevieve County, Missouri, in Book
  198 at Page 629 and in the office of the Recorder of Deeds of Madison
  County, Missouri, in Book 77 at Page 1 and in the office of the Recorder of
  Deeds of Iron County, Missouri, in Book 224 at Page 451 and in the office
  of the Recorder of Deeds of Butler County, Missouri, in Book 503 at Page
  606 and is filed in the office of the Secretary of State of Missouri under
  filing number 26,557; and
 
    (b) A supplemental indenture, hereinafter sometimes called the "First
  Supplemental Indenture", dated as of December 1, 1946, which is recorded in
  the office of the Recorder of Deeds of the City of St. Louis, Missouri, in
  Book 6562 at Page 528, and in the office of the Recorder of Deeds of St.
  Louis County, Missouri, in Book 2268 at Page 273; and
 
    (c) A supplemental indenture, hereinafter sometimes called the "Second
  Supplemental Indenture", dated as of March 15, 1948, which is recorded in
  the office of the Recorder of Deeds of the City of St. Louis, Missouri, in
  Book 6687 at Page 467, and in the office of the Recorder of Deeds of St.
  Louis County, Missouri, in Book 2327 at Page 357; and
 
    (d) A supplemental indenture, hereinafter sometimes called the "Third
  Supplemental Indenture", dated as of April 1, 1951, which is recorded in
  the office of the Recorder of Deeds of the City of St. Louis, Missouri, in
  Book 7079 at Page 125 and in the office of the Recorder of Deeds of St.
  Louis County, Missouri, in Book 2869 at Page 275; and
 
  Whereas, there have been heretofore duly executed and delivered four
indentures between the Company and Mercantile Trust Company, to-wit:
 
    (a) A supplemental indenture, hereinafter sometimes called the "Fourth
  Supplemental Indenture", dated as of December 1, 1954, which is recorded in
  the office of the Recorder of Deeds of the City of St. Louis, Missouri, in
  Book 7458 at Page 400 and in the office of the Recorder of Deeds of St.
  Louis County, Missouri, in Book 3342 at Page 34 and in the office of the
  Recorder of Deeds of Boone County, Missouri, in Book 294 at Page 477 and in
  the office of the Recorder of Deeds of Jefferson County, Missouri, in Book
  434 at Page 574 and in the office of the Recorder of Deeds of St. Francois
  County, Missouri, in Book 552 at Page 1 and in the office of the Recorder
  of Deeds of Ste. Genevieve County, Missouri, in Book 198 at Page 721 and in
  the office of the Recorder of Deeds of Madison County, Missouri, in Book 77
  at Page 183 and in the office of the Recorder of Deeds of Iron County,
  Missouri, in Book 224 at Page 632 and in the office of the Recorder of
  Deeds of Butler County, Missouri, in Book 507 at Page 1 and is filed in the
  office of the Secretary of State of Missouri under filing number 26,558;
  and
 
    (b) A supplemental indenture, hereinafter sometimes called the "Fifth
  Supplemental Indenture", dated as of May 1, 1957, which is recorded in the
  office of the Recorder of Deeds of the City of St. Louis, Missouri, in Book
  7731 at Page 152 and in the office of the Recorder of Deeds of St. Louis
  County,
<PAGE>
 
  Missouri, in Book 3766 at Page 1 and in the office of the Recorder of Deeds
  of Boone County, Missouri, in Book 294 at Page 494 and in the office of the
  Recorder of Deeds of Jefferson County, Missouri, in Book 434 at Page 611
  and in the office of the Recorder of Deeds of St. Francois County,
  Missouri, in Book 552 at Page 38 and in the office of the Recorder of Deeds
  of Ste. Genevieve County, Missouri, in Book 199 at Page 1 and in the office
  of the Recorder of Deeds of Madison County, Missouri, in Book 77 at Page
  220 and in the office of the Recorder of Deeds of Iron County, Missouri, in
  Book 226 at Page 1 and in the office of the Recorder of Deeds of Butler
  County, Missouri, in Book 507 at Page 38 and is filed in the office of the
  Secretary of State of Missouri under filing number 26,559; and
 
    (c) A supplemental indenture, hereinafter sometimes called the "Sixth
  Supplemental Indenture", dated as of July 1, 1960, which is recorded in the
  office of the Recorder of Deeds of the City of St. Louis, Missouri, in Book
  8087 at Page 55 and in the office of the Recorder of Deeds of St. Louis
  County, Missouri, in Book 4348 at Page 1 and in the office of the Recorder
  of Deeds of Boone County, Missouri, in Book 294 at Page 535 and in the
  office of the Recorder of Deeds of Jefferson County, Missouri, in Book 434
  at Page 651 and in the office of the Recorder of Deeds of St. Francois
  County, Missouri, in Book 552 at Page 78 and in the office of the Recorder
  of Deeds of Ste. Genevieve County, Missouri, in Book 199 at Page 22 and in
  the office of the Recorder of Deeds of Madison County, Missouri, in Book 77
  at Page 260 and in the office of the Recorder of Deeds of Iron County,
  Missouri, in Book 226 at Page 42 and in the office of the Recorder of Deeds
  of Butler County, Missouri, in Book 507 at Page 62 and is filed in the
  office of the Secretary of State of Missouri under filing number 26,560;
  and
 
    (d) A supplemental indenture, hereinafter sometimes called the "Seventh
  Supplemental Indenture", dated as of June 1, 1964, which is recorded in the
  office of the Recorder of Deeds of the City of St. Louis, Missouri, in Book
  8506 at Page 215 and in the office of the Recorder of Deeds of St. Louis
  County, Missouri, in Book 5410 at Page 399 and in the office of the
  Recorder of Deeds of Boone County, Missouri, in Book 342 at Page 2 and in
  the office of the Recorder of Deeds of Jefferson County, Missouri, in Book
  434 at Page 697 and in the office of the Recorder of Deeds of St. Francois
  County, Missouri, in Book 552 at Page 124 and in the office of the Recorder
  of Deeds of Ste. Genevieve County, Missouri, in Book 199 at Page 46 and in
  the office of the Recorder of Deeds of Madison County, Missouri, in Book 77
  at Page 306 and in the office of the Recorder of Deeds of Iron County,
  Missouri, in Book 226 at Page 89 and in the office of the Recorder of Deeds
  of Butler County, Missouri, in Book 507 at Page 90 and is filed in the
  office of the Secretary of State of Missouri under filing number 26,561;
  and
 
  Whereas, there have been heretofore duly executed and delivered eight
indentures between the Company and Mercantile Trust Company National
Association, to-wit:
 
    (a) A supplemental indenture, hereinafter sometimes called the "Eighth
  Supplemental Indenture", dated as of April 15, 1966, which is recorded in
  the office of the Recorder of Deeds of the City of St. Louis, Missouri, in
  Book 8678 at Page 1 and in the office of the Recorder of Deeds of St. Louis
  County, Missouri, in Book 5949 at Page 450 and in the office of the
  Recorder of Deeds of Boone County, Missouri, in Book 361 at Page 148 and in
  the office of the Recorder of Deeds of Jefferson County, Missouri, in Book
  434 at Page 746 and in the office of the Recorder of Deeds of St. Francois
  County, Missouri, in Book 552 at Page 172 and in the office of the Recorder
  of Deeds of Ste. Genevieve County, Missouri, in Book 199 at Page 71 and in
  the office of the Recorder of Deeds of Madison County, Missouri, in Book 77
  at Page 354 and in the office of the Recorder of Deeds of Iron County,
  Missouri, in Book 226 at Page 138 and in the office of the Recorder of
  Deeds of Butler County, Missouri, in Book 507 at Page 118 and is filed in
  the office of the Secretary of State of Missouri under filing number
  28,645; and
 
    (b) A supplemental indenture, hereinafter sometimes called the "Ninth
  Supplemental Indenture", dated as of May 1, 1968, which is recorded in the
  office of the Recorder of Deeds of the City of St. Louis, Missouri, in Book
  8834 at Page 213 and in the office of the Recorder of Deeds of St. Louis
  County, Missouri, in Book 6323 at Page 1904 and in the office of the
  Recorder of Deeds of Boone County, Missouri, in Book 389 at Page 888 and in
  the office of the Recorder of Deeds of St. Charles County, Missouri, in
  Book 498 at Page 408 and in the office of the Recorder of Deeds of
  Jefferson County, Missouri, in Book 434 at Page 790 and in the office of
  the Recorder of Deeds of St. Francois County, Missouri, in Book 552
 
                                       2
<PAGE>
 
  at Page 216 and in the office of the Recorder of Deeds of Ste. Genevieve
  County, Missouri, in Book 199 at Page 94 and in the office of the Recorder
  of Deeds of Madison County, Missouri, in Book 77 at Page 398 and in the
  office of the Recorder of Deeds of Iron County, Missouri, in Book 226 at
  Page 183 and in the office of the Recorder of Deeds of Butler County,
  Missouri, in Book 507 at Page 145 and is filed in the office of the
  Secretary of State of Missouri under filing number 87,403; and
 
    (c) A supplemental indenture, hereinafter sometimes called the "Tenth
  Supplemental Indenture", dated as of May 15, 1970, which is recorded in the
  office of the Recorder of Deeds of the City of St. Louis, Missouri, in Book
  8988 at Page 52 and in the office of the Recorder of Deeds of St. Louis
  County, Missouri, in Book 6456 at Page 132 and in the office of the
  Recorder of Deeds of Boone County, Missouri, in Book 396 at Page 560 and in
  the office of the Recorder of Deeds of St. Charles County, Missouri, in
  Book 554 at Page 79 and in the office of the Recorder of Deeds of Jefferson
  County, Missouri, in Book 434 at Page 829 and in the office of the Recorder
  of Deeds of St. Francois County, Missouri, in Book 552 at Page 255 and in
  the office of the Recorder of Deeds of Ste. Genevieve County, Missouri, in
  Book 199 at Page 114 and in the office of the Recorder of Deeds of Madison
  County, Missouri, in Book 77 at Page 436 and in the office of the Recorder
  of Deeds of Iron County, Missouri, in Book 226 at Page 223 and in the
  office of the Recorder of Deeds of Butler County, Missouri, in Book 507 at
  Page 168 and is filed in the office of the Secretary of State of Missouri
  under filing number 154,857; and
 
    (d) A supplemental indenture, hereinafter sometimes called the "Eleventh
  Supplemental Indenture", dated as of March 15, 1972, which is recorded in
  the office of the Recorder of Deeds of the City of St. Louis, Missouri, in
  Book 9133 at Page 4 and in the office of the Recorder of Deeds of St. Louis
  County, Missouri, in Book 6577 at Page 1993 and in the office of the
  Recorder of Deeds of Boone County, Missouri, in Book 401 at Page 706 and in
  the office of the Recorder of Deeds of St. Charles County, Missouri, in
  Book 620 at Page 157 and in the office of the Recorder of Deeds of
  Jefferson County, Missouri, in Book 435 at Page 23 and in the office of the
  Recorder of Deeds of Ste. Genevieve County, Missouri, in Book 199 at Page
  210 and in the office of the Recorder of Deeds of St. Francois County,
  Missouri, in Book 552 at Page 640 and in the office of the Recorder of
  Deeds of Iron County, Missouri, in Book 226 at Page 282 and in the office
  of the Recorder of Deeds of Madison County, Missouri, in Book 78 at Page 1
  and in the office of the Recorder of Deeds of Butler County, Missouri, in
  Book 507 at Page 265 and is filed in the office of the Secretary of State
  of Missouri under filing number 234,221; and
 
    (e) A supplemental indenture, hereinafter sometimes called the "Twelfth
  Supplemental Indenture", dated as of March 15, 1974, which is recorded in
  the office of the Recorder of Deeds of the City of St. Louis, Missouri, in
  Book 40M at Page 1 and in the office of the Recorder of Deeds of St. Louis
  County, Missouri, in Book 6721 at Page 91 and in the office of the Recorder
  of Deeds of Boone County, Missouri, in Book 407 at Page 888 and in the
  office of the Recorder of Deeds of St. Charles County, Missouri, in Book
  677 at Page 1445 and in the office of the Recorder of Deeds of Jefferson
  County, Missouri, in Book 465 at Page 976 and in the office of the Recorder
  of Deeds of Ste. Genevieve County, Missouri, in Book 210 at Page 255 and in
  the office of the Recorder of Deeds of St. Francois County, Missouri, in
  Book 598 at Page 683 and in the office of the Recorder of Deeds of Iron
  County, Missouri, in Book 237 at Page 1 and in the office of the Recorder
  of Deeds of Madison County, Missouri, in Book 84 at Page 117 and in the
  office of the Recorder of Deeds of Butler County, Missouri, in Book 535 at
  Page 540 and in the office of the Recorder of Deeds of Beckham County,
  Oklahoma, in Book 127 at Page 149 and in the office of the County Clerk of
  Wheeler County, Texas, in Trust Vol. 58 at Page 731 and is filed in the
  office of the Secretary of State of Missouri under filing number 333,360;
  and
 
    (f) A supplemental indenture, hereinafter sometimes called the
  "Thirteenth Supplemental Indenture", dated as of June 1, 1975, which is
  recorded in the office of the Recorder of Deeds of the City of St. Louis,
  Missouri, in Book 70M at Page 2061 and in the office of the Recorder of
  Deeds of St. Louis County, Missouri, in Book 6796 at Page 1447 and in the
  office of the Recorder of Deeds of Boone County, Missouri, in Book 411 at
  Page 9 and in the office of the Recorder of Deeds of St. Charles County,
  Missouri, in Book 704 at Page 1739 and in the office of the Recorder of
  Deeds of Jefferson County, Missouri, in Book 481 at Page 292 and in the
  office of the Recorder of Deeds of Ste. Genevieve County, Missouri, in Book
  124 at Page 225 and in the office of the Recorder of Deeds of St. Francois
  County, Missouri, in Book 624 at Page
 
                                       3
<PAGE>
 
  359 and in the office of the Recorder of Deeds of Iron County, Missouri, in
  Book 242 at Page 234 and in the office of the Recorder of Deeds of Madison
  County, Missouri, in Book 86 at Pages 483-532 and in the office of the
  Recorder of Deeds of Butler County, Missouri, in Book 547 at Page 300 and
  in the office of the Recorder of Deeds of Beckham County, Oklahoma, in Book
  130 at Page 416 and in the office of the County Clerk of Wheeler County,
  Texas, in Trust Vol. 59 at Page 649 and in the office of the Clerk of Court
  for Sabine Parish, Louisiana, under Registry No. 227328 in Mtg. Book 108 at
  Page 478 and in the office of the Clerk of Court for DeSoto Parish,
  Louisiana, under Registry No. 378628 in Mtg. Book 115 at Page 803 and in
  the office of the Clerk of Court for St. Mary Parish, Louisiana, under
  Registry No. 124894 in Mtg. Book 343 at Page 293 and in the office of the
  Clerk of Court for Red River Parish, Louisiana, under Registry No. 128419
  in Mtg. Book 75 at Page 546 and is filed in the office of the Secretary of
  State of Missouri under filing number 397,857; and
 
    (g) A supplemental indenture, hereinafter sometimes called the
  "Fourteenth Supplemental Indenture", dated as of October 26, 1976, which is
  recorded in the office of the Recorder of Deeds of the City of St. Louis,
  Missouri, in Book 108M at Page 131 and in the office of the Recorder of
  Deeds of St. Louis County, Missouri, in Book 6907 at Page 1970 and in the
  office of the Recorder of Deeds of Boone County, Missouri, in Book 416 at
  Page 192 and in the office of the Recorder of Deeds of St. Charles County,
  Missouri, in Book 745 at Page 40 and in the office of the Recorder of Deeds
  of Jefferson County, Missouri, in Book 507 at Page 669 and in the office of
  the Recorder of Deeds of Ste. Genevieve County, Missouri, in Book 241 at
  Page 279 and in the office of the Recorder of Deeds of St. Francois County,
  Missouri, in Book 654 at Page 132 and in the office of the Recorder of
  Deeds of Iron County, Missouri, in Book 248 at Page 795 and in the office
  of the Recorder of Deeds of Madison County, Missouri, in Book 89 at Pages
  694-700 and in the office of the Recorder of Deeds of Butler County,
  Missouri, in Book 565 at Page 57 and in the office of the Recorder of Deeds
  of Beckham County, Oklahoma, in Book 315 at Page 146 and in the office of
  the County Clerk of Wheeler County, Texas, in the Deed Records Vol. 260 at
  Page 991 and in the office of the Clerk of Court for Sabine Parish,
  Louisiana, under Registry No. 233001 in Mtg. Book 114 at Page 208 and in
  the office of the Clerk of Court for DeSoto Parish, Louisiana, under
  Registry No. 389929 in Mtg. Book 122 at Page 15 and in the office of the
  Clerk of Court for St. Mary Parish, Louisiana, under Registry No. 129850 in
  Mtg. Book 360 at Page 593 and in the office of the Clerk of Court for Red
  River Parish, Louisiana, under Registry No. 131795 in Mtg. Book 79 at Page
  21 and is filed in the office of the Secretary of State of Missouri under
  filing number 479,397; and
 
    (h) A supplemental indenture, hereinafter sometimes called the "Fifteenth
  Supplemental Indenture", dated as of July 15, 1979, which is recorded in
  the office of the Recorder of Deeds of the City of St. Louis, Missouri, in
  Book 202M at Page 1288 and in the office of the Recorder of Deeds of St.
  Louis County, Missouri, in Book 7181 at Page 23 and in the office of the
  Recorder of Deeds of Boone County, Missouri, in Book 430 at Page 273 and in
  the office of the Recorder of Deeds of St. Charles County, Missouri, in
  Book 846 at Page 880 and in the office of the Recorder of Deeds of
  Jefferson County, Missouri, in Book 580 at Page 278 and in the office of
  the Recorder of Deeds of Ste. Genevieve County, Missouri, in Book 285 at
  Page 93 and in the office of the Recorder of Deeds of St. Francois County,
  Missouri, in Book 722 at Page 57 and in the office of the Recorder of Deeds
  of Iron County, Missouri, in Book 262 at Pages 709-770 and in the office of
  the Recorder of Deeds of Madison County, Missouri, in Book 98 at Pages 720-
  781 and in the office of the Recorder of Deeds of Butler County, Missouri,
  in Book 597 at Page 661 and in the office of the County Clerk of Beckham
  County, Oklahoma, in Misc. Record Book 385 at Page 230 and in the office of
  the County Clerk of Roger Mills County, Oklahoma, in Book 273 at Pages 54-
  116 and in the office of the County Clerk of Blaine County, Oklahoma, in
  Book 325 Misc. Page 1 and in the office of the County Clerk of Wheeler
  County, Texas, in Deed of Trust Records, Vol. 64 at Page 707 and in the
  office of the County Clerk of Lipscomb County, Texas, in the Deed of Trust
  Records, Vol. 196 at Page 607 and in the office of the County Clerk of
  Roberts County, Texas, in the Deed of Trust Records, Vol. 30 at Page 45 and
  in the office of the County Clerk of Hemphill County, Texas, in the Deed of
  Trust Records, Vol. 59 at Page 428 and in the office of the Clerk of the
  Court for St. Mary Parish, Louisiana, under Registry No. 141319 in Mtg.
  Book 402 at Page 2 and in the office of the Clerk of the Court for the
  DeSoto Parish, Louisiana, under Registry No. 417237 in Mtg. Book 136 at
  Page 524 and in the office of the Clerk of the
 
                                       4
<PAGE>
 
  Court for Sabine Parish, Louisiana, under Registry No. 246026 in Mtg. Book
  128 at Page 86 and in the office of the Clerk of the Court for Red River
  Parish, Louisiana, under Registry No. 141470 in Mtg. Book 87 at Page 619
  and in the office of the Clerk of the Court for Terrebonne Parish,
  Louisiana, under Registry No. 602396 and is filed in the office of the
  Secretary of State of Missouri under Document Number 667303; and
 
  Whereas, there have been heretofore duly executed and delivered two
indentures between the Company and Mercantile Bank National Association, to-
wit:
 
    (a) A supplemental indenture, hereinafter sometimes called the "Sixteenth
  Supplemental Indenture", dated as of May 1, 1986, which is recorded in the
  office of the Recorder of Deeds of the City of St. Louis, Missouri, in Book
  M-529 at Page 655 and in the office of the Recorder of Deeds of St. Louis
  County, Missouri, in Book 7902 at Page 1138 and in the office of the
  Recorder of Deeds of Boone County, Missouri, in Book 573 at Page 2 and in
  the office of the Recorder of Deeds of St. Charles County, Missouri, in
  Book 1080 at Page 1577 and in the office of the Recorder of Deeds of
  Jefferson County, Missouri, in Book 197 at Page 1 and in the office of the
  Recorder of Deeds of Ste. Genevieve County, Missouri, in Book 407 at Page
  137 and in the office of the Recorder of Deeds of St. Francois County,
  Missouri, in Book 894 at Page 138 and in the office of the Recorder of
  Deeds of Iron County, Missouri, in Book 293 at Page 797 and in the office
  of the Recorder of Deeds of Madison County, Missouri, in Book 116 at Page
  589 and in the office of the Recorder of Deeds of Butler County, Missouri,
  in Book 669 at Page 228 and in the office of the County Clerk of Roger
  Mills County, Oklahoma, in Book 807 at Page 120 and in the office of the
  County Clerk of Wheeler County, Texas, in Deed of Trust Records, Vol. 91 at
  Page 191, and in Deed Records, Vol. 348 at Page 69 and in the office of the
  Secretary of State of Texas under Document Number 131214 and is filed in
  the office of the Secretary of State of Missouri under Document Number
  1322775; and
 
    (b) A supplemental indenture, hereinafter sometimes called the
  "Seventeenth Supplemental Indenture", dated as of May 15, 1988, which is
  recorded in the office of the Recorder of Deeds of the City of St. Louis,
  Missouri, in Book M-669 at Page 258 and in the office of the Recorder of
  Deeds of St. Louis County, Missouri, in Book 8315 at Page 902 and in the
  office of the Recorder of Deeds of Boone County, Missouri, in Book 676 at
  Page 449 and in the office of the Recorder of Deeds of St. Charles County,
  Missouri, in Book 1212 at Page 1948 and in the office of the Recorder of
  Deeds of Jefferson County, Missouri, in Book 396 at Page 1987 and in the
  office of the Recorder of Deeds of Ste. Genevieve County, Missouri, in Book
  459 at Page 289 and in the office of the Recorder of Deeds of St. Francois
  County, Missouri, in Book 962 at Page 8 and in the office of the Recorder
  of Deeds of Iron County, Missouri, in Book 303 at Page 527 and in the
  office of the Recorder of Deeds of Madison County, Missouri, in Book 123 at
  Page 243 and in the office of the Recorder of Deeds of Butler County,
  Missouri, in Book 691 at Page 620 and in the office of the County Clerk of
  Roger Mills County, Oklahoma, in Book 973 at Page 1 and in the office of
  the County Clerk of Wheeler County, Texas, in Deed of Trust Records, Vol.
  91 at Page 234, and in Deed Records, Vol. 369 at Page 386 and in the office
  of the Secretary of State of Texas under Document Number 86131214 and is
  filed in the office of the Secretary of State of Missouri under Document
  Number 1596374; and
 
  Whereas, there have been heretofore duly executed and delivered five
indentures between the Company and Mercantile Bank of St. Louis National
Association, to-wit:
 
    (a) A supplemental indenture, hereinafter sometimes called the
  "Eighteenth Supplemental Indenture", dated as of November 15, 1989, which
  is recorded in the office of the Recorder of Deeds of the City of St.
  Louis, Missouri, in Book 762M at Page 1126 and in the office of the
  Recorder of Deeds of St. Louis County, Missouri, in Book 8646 at Page 2196
  and in the office of the Recorder of Deeds of Boone County, Missouri, in
  Book 748 at Page 17 and in the office of the Recorder of Deeds of St.
  Charles County, Missouri, in Book 1294 at Page 631 and in the office of the
  Recorder of Deeds of Jefferson County, Missouri, in Book 442 at Page 14 and
  in the office of the Recorder of Deeds of Ste. Genevieve County, Missouri,
  in Book 498 at Page 13 and in the office of the Recorder of Deeds of St.
  Francois County, Missouri, in Book 1012 at Page 36 and in the office of the
  Recorder of Deeds of Iron County, Missouri, in Book 311 at Page 503 and in
  the
 
                                       5
<PAGE>
 
  office of the Recorder of Deeds of Madison County, Missouri, in Book 127 at
  Page 682 and in the office of the Recorder of Deeds of Butler County,
  Missouri, in Book 709 at Page 78 and in the office of the County Clerk of
  Roger Mills County, Oklahoma, in Book 1094 at Page 263 and in the office of
  the County Clerk of Wheeler County, Texas, in Deed of Trust Records, Vol.
  93 at Page 630 and in the office of the Secretary of State of Texas under
  Document Number 252980 and is filed in the office of the Secretary of State
  of Missouri under Document Number 1798065; and
 
    (b) A supplemental indenture, hereinafter sometimes called the
  "Nineteenth Supplemental Indenture", dated as of May 15, 1991, which is
  recorded in the office of the Recorder of Deeds of the City of St. Louis,
  Missouri, in Book 848 at Page 716 and in the office of the Recorder of
  Deeds of St. Louis County, Missouri, in Book 8983 at Page 1095 and in the
  office of the Recorder of Deeds of Boone County, Missouri, in Book 821 at
  Page 79 and in the office of the Recorder of Deeds of St. Charles County,
  Missouri, in Book 1370 at Page 1846 and in the office of the Recorder of
  Deeds of Jefferson County, Missouri, in Book 483 at Page 1909 and in the
  office of the Recorder of Deeds of Ste. Genevieve County, Missouri, in Book
  541 at Page 82 and in the office of the Recorder of Deeds of St. Francois
  County, Missouri, in Book 1060 at Page 253 and in the office of the
  Recorder of Deeds of Iron County, Missouri, in Book 319 at Page 355 and in
  the office of the Recorder of Deeds of Madison County, Missouri, in Book
  132 at Page 44 and in the office of the Recorder of Deeds of Butler County,
  Missouri, in Book 725 at Page 442 and in the office of the County Clerk of
  Roger Mills County, Oklahoma, in Book 1213 at Page 105, UCC Filing No. 135,
  and in the office of the County Clerk of Oklahoma County, Oklahoma, UCC
  Filing No. 023021, and in the office of the County Clerk of Wheeler County,
  Texas, in Deed of Trust Records, Vol. 96 at Page 96 and in Deed Records,
  Book 399 at Page 254, and in the office of the Secretary of State of Texas
  under Document Number 088153 and is filed in the office of the Secretary of
  State of Missouri under Document Number 1999268; and
 
    (c) A supplemental indenture, hereinafter sometimes called the "Twentieth
  Supplemental Indenture", dated as of November 1, 1992, which is recorded in
  the office of the Recorder of Deeds of the City of St. Louis, Missouri, in
  Book M945 at Page 1068 and in the office of the Recorder of Deeds of St.
  Louis County, Missouri, in Book 9494 at Page 423 and in the office of the
  Recorder of Deeds of Boone County, Missouri, in Book 937 at Page 144 and in
  the office of the Recorder of Deeds of St. Charles County, Missouri, in
  Book 1491 at Page 1289 and in the office of the Recorder of Deeds of
  Jefferson County, Missouri, in Book 543 at Page 2135 and in the office of
  the Recorder of Deeds of Ste. Genevieve County, Missouri, in Book 594 at
  Page 10 and in the office of the Recorder of Deeds of St. Francois County,
  Missouri, in Book 1121 at Page 458 and in the office of the Recorder of
  Deeds of Iron County, Missouri, in Book 326 at Page 888 and in the office
  of the Recorder of Deeds of Madison County, Missouri, in Book 137 at Page
  166 and in the office of the Recorder of Deeds of Butler County, Missouri,
  in Book 747 at Page 72 and in the office of the Recorder of Deeds of
  Franklin County, Missouri, in Book 712 at Page 889 and in the office of the
  County Clerk of Roger Mills County, Oklahoma, in Book 1303 at Page 39, UCC
  Filing No. 296, and in the office of the County Clerk of Oklahoma County,
  Oklahoma, UCC Filing No. 056514, and in the office of the County Clerk of
  Wheeler County, Texas, in Deed of Trust Records, Book 98 at Page 88 and in
  Deed Records, Book 409 at Page 589, and in the office of the Secretary of
  State of Texas under Document Number 212435 and is filed in the office of
  the Secretary of State of Missouri under Document Number 2188520; and
 
    (d) A supplemental indenture, hereinafter sometimes called the "Twenty-
  First Supplemental Indenture", dated as of May 1, 1993, which is recorded
  in the office of the Recorder of Deeds of the City of St. Louis, Missouri,
  in Book M982 at Page 0356 and in the office of the Recorder of Deeds of St.
  Louis County, Missouri, in Book 9701 at Page 797 and in the office of the
  Recorder of Deeds of Boone County, Missouri, in Book 979 at Page 722 and in
  the office of the Recorder of Deeds of St. Charles County, Missouri, in
  Book 1542 at Page 1449 and in the office of the Recorder of Deeds of
  Jefferson County, Missouri, in Book 567 at Page 2217 and in the office of
  the Recorder of Deeds of Ste. Genevieve County, Missouri, in Book 610 at
  Page 136 and in the office of the Recorder of Deeds of St. Francois County,
  Missouri, in Book 1142 at Page 84 and in the office of the Recorder of
  Deeds of Iron County, Missouri, in Book 328 at Page 508 and in the office
  of the Recorder of Deeds of Madison County, Missouri, in Book
 
                                       6
<PAGE>
 
  139 at Page 361 and in the office of the Recorder of Deeds of Butler
  County, Missouri, in Book 753 at Page 328 and in the office of the Recorder
  of Deeds of Franklin County, Missouri, in Book 743 at Page 638 and in the
  office of the County Clerk of Roger Mills County, Oklahoma, in Book 1337 at
  Page 10, UCC Filing No. 109, and in the office of the County Clerk of
  Oklahoma County, Oklahoma, UCC Filing No. 023874 and in the office of the
  County Clerk of Wheeler County, Texas, in Deed of Trust Records, Book 98 at
  Page 804 and in Deed Records, Book 413 at Page 387, and in the office of
  the Secretary of State of Texas under Document No. 086970 and is filed in
  the office of the Secretary of State of Missouri under Document No.
  2259648; and
 
    (e) A supplemental indenture, hereinafter sometimes called the "Twenty-
  Second Supplemental Indenture", dated as of November 15, 1995, which is
  filed in the office of the Secretary of State of Missouri pursuant to
  R.S.Mo. 443.451 under Filing No. 2604323; and
 
  Whereas, the Company is the same corporation as is designated in the
Original and First and Second Supplemental Indentures as The Laclede Gas Light
Company, which was the Company's corporate name, but before the date of the
Third Supplemental Indenture its corporate name was duly changed to, and now
is, Laclede Gas Company; and
 
  Whereas, State Street Bank and Trust Company of Missouri, N.A., the party of
the second part to this Twenty-Third Supplemental Indenture, is the present
Trustee under the Original Indenture, being the successor to Mercantile Bank
of St. Louis National Association (from whom State Street Bank and Trust
Company of Missouri, N.A., acquired certain corporate trust assets), which
Mercantile Bank of St. Louis National Association was the successor to
Mercantile Bank National Association, which was the successor to Mercantile
Trust Company National Association, which was the successor to Mercantile
Trust Company (which in turn was the corporation resulting from a
consolidation on August 31, 1951, to which Mississippi Valley Trust Company,
the original Trustee, was a party); and
 
  Whereas, there are now outstanding under the Seventeenth Supplemental
Indenture, First Mortgage Bonds of the 9 5/8% Series due May 15, 2013; under
the Eighteenth Supplemental Indenture, First Mortgage Bonds of the 8 1/2%
Series due November 15, 2004; under the Nineteenth Supplemental Indenture,
First Mortgage Bonds of the 8 5/8% Series due May 15, 2006; under the
Twentieth Supplemental Indenture, First Mortgage Bonds of the 7 1/2% Series
due November 1, 2007; under the Twenty-First Supplemental Indenture, First
Mortgage Bonds of the 6 1/4% Series due May 1, 2003; and under the Twenty-
Second Supplemental Indenture, First Mortgage Bonds of the 6 1/2% Series due
November 15, 2010; but all bonds of the fifteen series provided for
respectively by the First, Second, Third, Fourth, Fifth, Sixth, Seventh,
Eighth, Ninth, Tenth, Eleventh, Twelfth, Thirteenth, Fifteenth and Sixteenth
Supplemental Indentures and the First Mortgage Bonds of the 3 1/2% Series
issued under the Original Indenture have ceased to be outstanding; and
 
  Whereas, the Company desires to create a new series of bonds under the
Mortgage to be designated as "First Mortgage Bonds, 6 1/2% Series due October
15, 2012" (hereinafter sometimes referred to as the "2012 Series"), for an
aggregate principal amount of $25,000,000 to be issued as fully registered
bonds without coupons, the definitive bonds (certain of the provisions of
which may be printed on the reverse side thereof) and the Trustee's
certificate of authentication thereof to be substantially in the following
forms, respectively:
 
                        (FORM OF FULLY REGISTERED BOND)
                              LACLEDE GAS COMPANY
                             FIRST MORTGAGE BOND,
 
No.                   6 1/2% Series due October 15, 2012                  $
 
  Laclede Gas Company, a corporation of the State of Missouri (hereinafter
called "the Company"), for value received hereby promises to pay to     or
registered assigns, at the office or agency of the Company in the Borough of
Manhattan, The City of New York, or at the option of the registered owner
hereof at the office
 
                                       7
<PAGE>
 
or agency of the Company in the City of St. Louis, State of Missouri,
Dollars on the 15th day of October, 2012, in such coin or currency of the
United States of America as at the time of payment shall be legal tender for
public and private debts, and to pay to the registered owner hereof interest
thereon from the 15th day of October or the 15th day of April next preceding
the date of this bond (or, if this bond is dated any date after the record
date for any interest payment date and on or before such interest payment
date, then from such interest payment date), at the rate of 6 1/2% per annum,
in like coin or currency at either of said offices or agencies at the option
of the registered owner hereof, on April 15 and October 15 in each year, until
the Company's obligation with respect to the payment of such principal shall
have been discharged. The interest so payable on any April 15 or October 15
will, subject to certain exceptions provided in the Mortgage hereinafter
mentioned, be paid to the person in whose name this bond is registered at the
close of business on the record date, which shall be the April 1 or October 1,
as the case may be, next preceding such interest payment date, or, if such
April 1 or October 1 shall be a legal holiday or a day on which banking
institutions in the Borough of Manhattan, The City of New York, or in the City
of St. Louis, State of Missouri, are authorized by law to close, the next
preceding day which shall not be a legal holiday or a day on which such
institutions are so authorized to close.
 
  This bond is one of an issue of bonds of the Company, issuable in series,
and is one of a series known as its First Mortgage Bonds, 6 1/2% Series due
October 15, 2012 (hereinafter referred to as the "2012 Series"), all bonds of
all series issued and to be issued under and equally secured (except in so far
as any sinking or other fund established in accordance with the provisions of
the Mortgage hereinafter mentioned may afford additional security for the
bonds of any particular series) by a Mortgage and Deed of Trust (hereinafter
referred to as the "Original Indenture") dated as of February 1, 1945,
executed by the Company to Mississippi Valley Trust Company, which was
succeeded through consolidation by Mercantile Trust Company, which was
succeeded by Mercantile Trust Company National Association, which was
succeeded by Mercantile Bank National Association, which was succeeded by
Mercantile Bank of St. Louis National Association, which in turn was succeeded
by State Street Bank and Trust Company of Missouri, N.A. (hereinafter
sometimes referred to as the "Trustee"), as Trustee, and indentures
supplemental thereto, including the supplemental indenture thereto dated as of
October 15, 1997, said Mortgage and Deed of Trust as supplemented being herein
called the "Mortgage," to which reference is made for a description of the
property mortgaged and pledged, the nature and extent of the security, the
rights of the owners of the bonds in respect thereof, the duties and
immunities of the Trustee, and the terms and conditions upon which the bonds
are secured. With the consent of the Company and to the extent permitted by
and as provided in the Mortgage, the rights and obligations of the Company
and/or of the owners of the bonds and/or coupons and/or the terms and
provisions of the Mortgage and/or of any instruments supplemental thereto may
be modified or altered by the affirmative vote of the owners of at least
sixty-six and two-thirds percent (66 2/3%) in principal amount of the bonds
affected by such modification or alteration (including the bonds of the 2012
Series, if so affected), then outstanding under the Mortgage (excluding bonds
disqualified from voting by reason of the Company's interest therein as
provided in the Mortgage); provided that no such modification or alteration
shall permit the extension of the maturity of the principal of this bond or
the reduction in the rate of interest hereon or any other modification in the
terms of payment of such principal or interest, or the creation of a lien on
the mortgaged and pledged property ranking prior to or on a parity with the
lien of the Mortgage or the deprivation of the owner hereof of a lien upon
such property without the consent of the owner hereof, except that the owners
of not less than seventy-five percent (75%) in principal amount of the bonds
at any time outstanding under the Mortgage (including a like percent of the
principal amount of the bonds of the 2012 Series, if any interest payment on
bonds of the 2012 Series is to be affected) may consent on behalf of the
owners of all bonds at any time outstanding to the postponement of any
interest payment for a period not exceeding three years from its due date.
 
  The bonds of the 2012 Series are redeemable, in whole or in part, upon the
notice referred to below, and otherwise subject to the provisions of the
Mortgage, at any time prior to maturity through operation of the maintenance
and improvement fund, or pursuant to paragraph B of Section 13.06 of the
Original Indenture (having reference to the taking of all the mortgaged
property by eminent domain and certain comparable contingencies) at 100% of
the principal amount thereof, together with accrued interest to the date fixed
for redemption. Except as set forth above, the bonds of the 2012 Series are
not redeemable prior to October 15, 2012.
 
                                       8
<PAGE>
 
  The notice of redemption of bonds of the 2012 Series shall be given by
mailing a copy thereof to each registered owner, directed to his registered
address not less than thirty nor more than ninety days prior to the date fixed
for redemption; all as provided in, and subject to the applicable provisions
of, the Mortgage.
 
  The principal hereof may be declared or may become due on the conditions, in
the manner, and at the time set forth in the Mortgage, upon the occurrence of
a completed default as in the Mortgage provided.
 
  At the option of the registered owner, any bonds of the 2012 Series, upon
surrender thereof at the office or agency of the Company in the Borough of
Manhattan, The City of New York, or in the City of St. Louis, State of
Missouri, together with a written instrument of transfer in form approved by
the Company duly executed by the registered owner or his duly authorized
attorney, shall, subject to the provisions of Section 2.05 of the Original
Indenture, be exchangeable for a like aggregate amount of fully registered
bonds of the same series of other authorized denominations.
 
  This bond is transferable as prescribed in the Mortgage by the registered
owner hereof in person, or by his duly authorized attorney, at the office or
agency of the Company in the Borough of Manhattan, The City of New York, or in
the City of St. Louis, upon surrender and cancellation of this bond and upon
presentation of a written instrument of transfer, duly executed, and upon
payment, if the Company shall require it, of the transfer charges prescribed
in the Mortgage, and thereupon, a new fully registered bond of the same series
for a like principal amount will be issued to the transferee in exchange
herefor as provided in the Mortgage. The Company and the Trustee may deem and
treat the person in whose name this bond is registered as the absolute owner
hereof for the purpose of receiving payment and for all other purposes.
 
  No recourse shall be had for the payment of the principal of or of interest
on this bond against any incorporator or any past, present or future
subscriber to the capital stock, stockholder, officer or director of the
Company or of any predecessor or successor corporation, as such, either
directly or through the Company or any predecessor or successor corporation,
under any rule of law, statute or constitution or by the enforcement of any
assessment or otherwise, all such liability of incorporators, subscribers,
stockholders, officers and directors, as such, being released by the owner
hereof by the acceptance of this bond and being likewise waived and released
by the terms of the Mortgage.
 
  This bond shall not become obligatory until State Street Bank and Trust
Company of Missouri, N.A., the Trustee under the Mortgage, or its successor
thereunder, shall have signed the form of certificate endorsed hereon.
 
  In Witness Whereof, Laclede Gas Company has caused this instrument to be
signed in its name by its President or one of its Vice-Presidents, by his
signature or a facsimile thereof, and a facsimile of its corporate seal to be
imprinted hereon and attested by its Secretary or one of its Assistant
Secretaries, by his signature or a facsimile thereof.
 
Dated _______________________________
 
                                          Laclede Gas Company
 
                                          By __________________________________
                                                        President
 
ATTEST:
 
_____________________________________
              Secretary
 
 
                                       9
<PAGE>
 
                        (FORM OF TRUSTEE'S CERTIFICATE)
 
  This bond is one of the bonds, of the Series herein designated, provided for
in the within-mentioned Mortgage.
 
                                          State Street Bank and Trust Company
                                           of Missouri, N.A., Trustee
 
                                          By __________________________________
                                            Authorized Officer
 
and
 
  Whereas, all conditions and requirements necessary to make this Twenty-Third
Supplemental Indenture a valid, binding and legal instrument have been done,
performed and fulfilled, and the execution and delivery hereof have been in
all respects duly authorized;
 
  Now, Therefore, This Twenty-Third Supplemental Indenture Witnesseth: That
Laclede Gas Company, in consideration of the premises and of one dollar to it
duly paid by the Trustee at or before the ensealing and delivery of these
presents, the receipt whereof is hereby acknowledged, and in order to secure
the payment both of the principal of and interest and premium, if any, on the
bonds from time to time issued under the Mortgage, according to their tenor
and effect and the performance of all the provisions of the Mortgage and of
said bonds, hath granted, bargained and sold, released, conveyed, assigned,
transferred, mortgaged, pledged, set over and confirmed, and by these presents
doth grant, bargain and sell, release, convey, assign, transfer, mortgage,
pledge, set over and confirm unto State Street Bank and Trust Company of
Missouri, N.A., as Trustee, and to its successor or successors in said trust
and its and their assigns forever, all the following described properties of
the Company, that is to say:
 
  All several parcels of real estate more particularly described in the
Original Indenture as Parcels Nos. 1 to 14 inclusive, and in the First
Supplemental Indenture as Parcels (a) to (i) inclusive, and the Third
Supplemental Indenture as Parcels II to VI inclusive, and in the Fourth
Supplemental Indenture in paragraphs II to VII inclusive, beginning on page 13
and extending to page 15 thereof, and in the Fifth Supplemental Indenture in
paragraphs II to X inclusive, beginning on page 14 and extending to page 17
thereof, and in the Sixth Supplemental Indenture in paragraphs II to XI
inclusive, beginning on page 14 and extending to page 21 thereof, and in the
Seventh Supplemental Indenture in paragraphs II to XIII inclusive, beginning
on page 16 and extending to page 24 thereof, and in the Eighth Supplemental
Indenture in paragraphs II to VIII inclusive, beginning on page 16 and
extending to page 19 thereof, and in the Ninth Supplemental Indenture in
paragraphs II and III, beginning on page 11 and extending to page 12 thereof,
and in the Tenth Supplemental Indenture in paragraphs II to VI inclusive,
beginning on page 11 and extending to page 13 thereof, and in the Eleventh
Supplemental Indenture in paragraphs II and III, beginning on page 13 and
extending to page 16 thereof, and in the Twelfth Supplemental Indenture on
page 15 thereof, and in the Thirteenth Supplemental Indenture beginning on
page 16 and extending to page 24 thereof, and in the Fifteenth Supplemental
Indenture beginning on page 15 and extending to page 39 thereof, and in the
Sixteenth Supplemental Indenture beginning on page 16 and extending to page 17
thereof, and in the Seventeenth Supplemental Indenture beginning on page 17
and extending to page 19 thereof, and in the Eighteenth Supplemental Indenture
beginning on page 15 and extending to page 16 thereof, and in the Nineteenth
Supplemental Indenture beginning on page 16 and extending to page 17 thereof,
and in the Twentieth Supplemental Indenture beginning on page 17 and extending
to page 19 thereof, and in the Twenty-First Supplemental Indenture beginning
on page 17 and extending to page 19 thereof, and in the Twenty-Second
Supplemental Indenture beginning on page 10 and extending to page 11 thereof,
except any parcel or part of such real estate heretofore released from the
lien of the Mortgage, or to which the Company and the Trustee have heretofore
disclaimed any right, title, or interest.
 
                                      10
<PAGE>
 
  Together With all other property, whether real, personal or mixed (except
any hereinafter expressly excepted), and whether now owned or hereafter
acquired by the Company and wheresoever situated, including (without in
anywise limiting or impairing by the enumeration of the same the scope and
intent of the foregoing or of any general description contained in this
Twenty-Third Supplemental Indenture) all real estate, lands, leases,
leaseholds (except the last day of the term of any lease or leasehold),
easements, licenses, permits, franchises, privileges, rights of way and other
rights in or relating to real estate or the occupancy of lands, all rights of
way and roads, all gas plants, gas containers, buildings and other structures
and all offices, buildings and the contents thereof; all machinery, engines,
boilers, gas machines, purifiers, scrubbers, retorts, tanks, pumps,
regulators, meters, gas and mechanical appliances, conduits, gas or other
pipes, gas mains and pipes, service pipes, fittings, valves and connections,
tools, implements, apparatus, supplies, furniture and chattels; all federal,
state, municipal and other franchises, privileges and permits; all lines for
the distribution of gas for any purpose including pipes, conduits and all
apparatus for use in connection therewith; and (except as hereinafter
expressly excepted) all the right, title and interest of the Company in and to
all other property of any kind or nature appertaining to and/or used and/or
occupied and/or enjoyed in connection with any property hereinabove described
or referred to;
 
  And Together With all and singular the tenements, hereditaments and
appurtenances belonging or in anywise appertaining to the aforesaid property
or any part thereof, with the reversion and reversions, remainder and
remainders, and (subject to the provisions of Section 13.01 of the Original
Indenture) the tolls, rents, revenues, issues, earnings, income, product and
profits thereof, and all the estate, right, title and interest and claim
whatsoever, at law as well as in equity, which the Company now has or may
hereafter acquire in and to the aforesaid property and franchises and every
part and parcel thereof;
 
  Provided that all property of the kinds which by the terms of the Original
Indenture are expressly excepted from the lien and operation thereof is
expressly excepted herefrom with the same effect and to the same extent as in
the Original Indenture provided with respect to such property so expressly
excepted;
 
  To Have And To Hold all such properties, real, personal, and mixed, granted,
bargained, sold, released, conveyed, assigned, transferred, mortgaged,
pledged, set over or confirmed by the Company as aforesaid, or intended so to
be, unto the Trustee and its successors and assigns forever;
 
  Subject, however, as to all property embraced herein to all of the
restrictions, exceptions and reservations of easements, rights of way or
otherwise, contained in any and all deeds and/or other conveyances under or
through which the Company acquired or shall acquire and/or claims or shall
claim title thereto, and to the restrictions, exceptions, reservations and
provisions in the Mortgage specifically set forth; and
 
  Subject further, with respect to the premises, property, franchises and
rights owned by the Company at the date of execution hereof, to excepted
encumbrances as defined in Section 1.06 of the Original Indenture, and
subject, with respect to property acquired after the date of execution of the
Original Indenture or hereafter acquired, to all excepted encumbrances, all
other defects and limitations of title and to all other encumbrances existing
at the time of such acquisition, including any purchase money mortgage or lien
upon such property created by the Company at the time of the acquisition of
such property.
 
  In Trust Nevertheless, upon the terms and trusts in the Original Indenture
and this Twenty-Third Supplemental Indenture set forth, for the benefit and
security of those who shall hold the bonds and coupons issued and to be issued
under the Mortgage, or any of them, in accordance with the terms of the
Mortgage without preference, priority or distinction as to lien of any of said
bonds and coupons over any other thereof by reason of priority in the time of
the issue or negotiation thereof or for any other reason whatsoever, subject,
however, to the provisions in reference to extended, transferred or pledged
coupons and claims for interest in the Original Indenture set forth; it being
intended that the lien and security of all of said bonds and coupons of all
series issued or to be issued hereunder shall take effect from the execution
and delivery of the Mortgage, and that the lien and security of the Mortgage
shall take effect from the date of execution and delivery of the Original
Indenture as though all of the said bonds of all series were actually
authenticated and delivered and issued upon such date.
 
                                      11
<PAGE>
 
  And the Company, for itself and its successors and assigns, does hereby
covenant and agree to and with the Trustee and its successor or successors in
such trust, for the benefit of those who shall hold the bonds of the 2012
Series, or any of such bonds, as follows:
 
                                   ARTICLE I
 
                                  Definitions
 
  Section 1.1. For all purposes of this Twenty-Third Supplemental Indenture,
except as herein otherwise expressly provided or unless the context otherwise
requires, the terms defined in Sections 1.2 to 1.28 hereof shall have the
meanings specified in such Sections, and all other terms which are defined in
the Original Indenture (including those defined by reference to the Trust
Indenture Act of 1939, as amended, or the Securities Act of 1933, as amended)
shall have the meanings assigned to them in the Original Indenture.
 
  Section 1.2. The term "the Trustee" shall mean the party of the second part
hereto, State Street Bank and Trust Company of Missouri, N.A., and, subject to
the provisions of Article XVIII of the Original Indenture, shall also include
its successors and assigns.
 
  Section 1.3. The term "Original Indenture" shall mean the indenture of
mortgage and deed of trust dated as of February 1, 1945, hereinbefore referred
to.
 
  Section 1.4. The term "First Supplemental Indenture" shall mean the
supplemental indenture dated as of December 1, 1946, hereinbefore referred to.
 
  Section 1.5. The term "Second Supplemental Indenture" shall mean the
supplemental indenture dated as of March 15, 1948, hereinbefore referred to.
 
  Section 1.6. The term "Third Supplemental Indenture" shall mean the
supplemental indenture dated as of April 1, 1951, hereinbefore referred to.
 
  Section 1.7. The term "Fourth Supplemental Indenture" shall mean the
supplemental indenture dated as of December 1, 1954, hereinbefore referred to.
 
  Section 1.8. The term "Fifth Supplemental Indenture" shall mean the
supplemental indenture dated as of May 1, 1957, hereinbefore referred to.
 
  Section 1.9. The term "Sixth Supplemental Indenture" shall mean the
supplemental indenture dated as of July 1, 1960, hereinbefore referred to.
 
  Section 1.10. The term "Seventh Supplemental Indenture" shall mean the
supplemental indenture dated as of June 1, 1964, hereinbefore referred to.
 
  Section 1.11. The term "Eighth Supplemental Indenture" shall mean the
supplemental indenture dated as of April 15, 1966, hereinbefore referred to.
 
  Section 1.12. The term "Ninth Supplemental Indenture" shall mean the
supplemental indenture dated as of May 1, 1968, hereinbefore referred to.
 
  Section 1.13. The term "Tenth Supplemental Indenture" shall mean the
supplemental indenture dated as of May 15, 1970, hereinbefore referred to.
 
  Section 1.14. The term "Eleventh Supplemental Indenture" shall mean the
supplemental indenture dated as of March 15, 1972, hereinbefore referred to.
 
  Section 1.15. The term "Twelfth Supplemental Indenture" shall mean the
supplemental indenture dated as of March 15, 1974, hereinbefore referred to.
 
                                      12
<PAGE>
 
  Section 1.16. The term "Thirteenth Supplemental Indenture" shall mean the
supplemental indenture dated as of June 1, 1975, hereinbefore referred to.
 
  Section 1.17. The term "Fourteenth Supplemental Indenture" shall mean the
supplemental indenture dated as of October 26, 1976, hereinbefore referred to.
 
  Section 1.18. The term "Fifteenth Supplemental Indenture" shall mean the
supplemental indenture dated as of July 15, 1979, hereinbefore referred to.
 
  Section 1.19. The term "Sixteenth Supplemental Indenture" shall mean the
supplemental indenture dated as of May 1, 1986, hereinbefore referred to.
 
  Section 1.20. The term "Seventeenth Supplemental Indenture" shall mean the
supplemental indenture dated as of May 15, 1988, hereinbefore referred to.
 
  Section 1.21. The term "Eighteenth Supplemental Indenture" shall mean the
supplemental indenture dated as of November 15, 1989, hereinbefore referred
to.
 
  Section 1.22. The term "Nineteenth Supplemental Indenture" shall mean the
supplemental indenture dated as of May 15, 1991, hereinbefore referred to.
 
  Section 1.23. The term "Twentieth Supplemental Indenture" shall mean the
supplemental indenture dated as of November 1, 1992, hereinbefore referred to.
 
  Section 1.24. The term "Twenty-First Supplemental Indenture" shall mean the
supplemental indenture dated as of May 1, 1993, hereinbefore referred to.
 
  Section 1.25. The term "Twenty-Second Supplemental Indenture" shall mean the
supplemental indenture dated as of November 15, 1995, hereinbefore referred
to.
 
  Section 1.26. The term "the Mortgage" shall mean the Original Indenture as
supplemented by the First, Second, Third, Fourth, Fifth, Sixth, Seventh,
Eighth, Ninth, Tenth, Eleventh, Twelfth, Thirteenth, Fourteenth, Fifteenth,
Sixteenth, Seventeenth, Eighteenth, Nineteenth, Twentieth, Twenty-First and
Twenty-Second Supplemental Indentures and hereby, or as the same may from time
to time hereafter be supplemented, modified, altered or amended by any
supplemental indenture entered into pursuant to the provisions of the Original
Indenture.
 
  Section 1.27. The term "hereof", "hereunder", "hereto", "hereby",
"hereinbefore", and the like, refer to this Twenty-Third Supplemental
Indenture.
 
  Section 1.28. The term "2012 Series" shall mean the series of First Mortgage
Bonds created by this Twenty-Third Supplemental Indenture, as in Section 2.1
hereof provided.
 
                                  ARTICLE II
 
 Creation, Description, Registration, Transfer and Exchange of The 2012 Series
                                   of Bonds
 
  Section 2.1. The Company hereby creates a new series of bonds which may be
authenticated and delivered, either before or after the filing or recording
hereof, under any applicable provisions of the Original Indenture, and may be
issued under the Mortgage, and which shall be designated by the title "First
Mortgage Bonds, 6 1/2% Series due October 15, 2012." The aggregate principal
amount of bonds of the 2012 Series which may be executed by the Company and
authenticated, is limited to Twenty-Five Million Dollars ($25,000,000), except
bonds of such series authenticated and delivered pursuant to Section 2.4 or
2.6 hereof or Section 2.09 or Section 12.04 of the Original Indenture.
 
                                      13
<PAGE>
 
  Section 2.2. All bonds of the 2012 Series shall be dated as provided in
Section 2.03 of the Original Indenture.
 
  Section 2.3. The bonds of the 2012 Series shall be issuable only as fully
registered bonds without coupons, in the denomination of $1,000, and, at the
option of the Company, in any multiple or multiples of $1,000, and such bonds,
and the Trustee's certificate of authentication, shall, respectively, be
substantially of the tenor and purport in this Twenty-Third Supplemental
Indenture above recited, and they may have such letters, numbers or other
marks of identification, and such legends or endorsements, printed,
lithographed or engraved thereon as the Company may deem appropriate and as
are not inconsistent with the Mortgage, including any legend or legends
permitted pursuant to Section 2.04 of the Original Indenture.
 
  Section 2.4. At the option of the registered owner, any bonds of the 2012
Series, upon surrender thereof at the office or agency of the Company in the
Borough of Manhattan, The City of New York, or in the City of St. Louis, State
of Missouri, together with a written instrument of transfer in form approved
by the Company duly executed by the registered owner or his duly authorized
attorney, shall, subject to the provisions of Section 2.05 of the Original
Indenture, be exchangeable for a like aggregate amount of fully registered
bonds of the same series of other authorized denominations.
 
  Section 2.5. The bonds of the 2012 Series are transferable as prescribed in
the Mortgage by the registered owner thereof in person, or by his duly
authorized attorney, at the office or agency of the Company in the Borough of
Manhattan, The City of New York, or in the City of St. Louis, State of
Missouri, upon surrender and cancellation of such bonds and upon presentation
of a written instrument of transfer, duly executed, and upon payment, if the
Company shall require it, of the transfer charges prescribed in the Mortgage,
and thereupon, new fully registered bonds of the same series for a like
principal amount will be issued to the transferee in exchange therefor as
provided in the Mortgage.
 
  Section 2.6. Until bonds of the 2012 Series in definitive form are ready for
delivery, there may be authenticated and delivered and issued, in lieu of any
definitive bond or bonds of said series, temporary bonds of said series as
provided in Section 2.08 of the Original Indenture. Such temporary bonds shall
be substantially in the form of the definitive bonds of the 2012 Series, but
with such omissions, insertions and variations as may be appropriate for
temporary bonds, and may contain such reference to any provisions of the
Mortgage as may be appropriate, all as determined by the Board of Directors.
 
  Section 2.7. The person in whose name any bond of the 2012 Series is
registered at the close of business on any record date (as hereinbelow
defined) with respect to any interest payment date shall be entitled to
receive the interest payable on such interest payment date notwithstanding the
cancellation of such bond upon any transfer or exchange thereof subsequent to
the record date and prior to such interest payment date, except if and to the
extent the Company shall default in the payment of the interest due on such
interest payment date, in which case such defaulted interest shall be paid to
the person in whose name such bond is registered on the date of payment of
such defaulted interest. The record date shall be April 1 or October 1, as the
case may be, next preceding such interest payment date, or, if such April 1 or
October 1 shall be a legal holiday or a day on which banking institutions in
the Borough of Manhattan, The City of New York, or in the City of St. Louis,
State of Missouri, are authorized by law to close, the next preceding day
which shall not be a legal holiday or a day on which such institutions are so
authorized to close.
 
  Section 2.8. Anything in this Twenty-Third Supplemental Indenture to the
contrary notwithstanding, the Company shall not be required to make transfers
or exchanges of bonds of the 2012 Series for a period of fifteen (15) days
next preceding any selection of bonds of such series to be redeemed, and the
Company shall not be required to make transfers or exchanges of the principal
amount of any of such bonds called or selected for redemption except in the
case of any bond of the 2012 Series to be redeemed in part, the portion
thereof not so to be redeemed.
 
                                      14
<PAGE>
 
                                  ARTICLE III
 
                    Redemption of Bonds of The 2012 Series
 
  Section 3.1. Bonds of the 2012 Series shall be redeemable, in whole or in
part, at 100% of the principal amount thereof, together with accrued interest
to the date fixed for redemption at any time before maturity by the
application of cash deposited with the Trustee as the result of the operation
of the Maintenance and Improvement Fund provided for in Section 9.07 of the
Original Indenture or in Section 4.1 hereof, or pursuant to the provisions of
paragraph (B) of Section 13.06 of the Original Indenture.
 
  Section 3.2. Article XII of the Original Indenture is and shall be
applicable to any redemption of bonds of the 2012 Series. The notice of
intention to redeem provided for in Section 12.02 of the Original Indenture
need not be published with respect to bonds of the 2012 Series but shall be
given by mailing a copy thereof to each registered owner thereof, directed to
his registered address, not less than thirty nor more than ninety days prior
to the date fixed for redemption.
 
                                  ARTICLE IV
 
                      Particular Covenants of The Company
 
  Section 4.1. So long as any bonds of the 2012 Series are outstanding, all
covenants and provisions of Section 9.07 of the Original Indenture which
(under the terms of the Original Indenture and without regard to any provision
of any supplemental indenture heretofore or hereafter executed) expired when
all bonds of the 3 1/2% Series due 1965 ceased to be outstanding, shall
continue in force and effect; provided, however, that the provisions of said
Section 9.07 with reference to computing the Maintenance and Improvement Fund
on the basis of 15% of the gross operating revenue of the Company (which had
ceased to be applicable prior to the retirement of the 3 1/2% Series due 1965)
shall remain inapplicable, and the provisions for such computation on the
basis of 2 3/4% of the average amount of the gross property account of the
Company shall continue to apply, so long as any bonds of the 2012 Series are
outstanding.
 
  Section 4.2. So long as any of the bonds of the 2012 Series are outstanding,
the Company will not (a) declare any dividends (other than dividends in common
stock) on any common stock, or order the making of any distribution on any
shares of common stock or to owners of common stock or (b) purchase, redeem or
otherwise acquire or retire for value any shares of common stock, if the
aggregate net amount of such declarations, distributions so ordered,
purchases, redemptions, acquisitions and retirements after September 30, 1953,
would exceed the sum of (a) the Net Income Available for Common Stock for the
period beginning October 1, 1953, and ending with the last day of the calendar
quarter immediately preceding the calendar quarter in which such dividend is
declared, distribution ordered, or purchase, redemption, acquisition or
retirement made, plus (b) Eight Million Dollars ($8,000,000).
 
  The aggregate net amount of the declarations, distributions ordered,
purchases, redemptions, acquisitions and retirements referred to in the first
paragraph of this Section 4.2 shall be determined by deducting from the
aggregate amount thereof the total amount of cash payments received by the
Company after September 30, 1953, for any shares of common stock sold by the
Company after September 30, 1953.
 
  Net Income Available for Common Stock, for the purpose of this Section 4.2,
for any period, means (1) the net income of the Company for such period
computed according to the applicable system of accounts prescribed by the
Public Service Commission of Missouri and any applicable orders of said
Commission and (to the extent not prescribed by such system of accounts or
orders) according to generally accepted accounting principles, less (2) an
amount equal to the dividends accrued (whether or not declared or paid) during
such period on any and all classes of stock having preference over the common
stock as to assets or dividends.
 
                                      15
<PAGE>
 
  For the purposes of the last preceding paragraph of this Section, the term
"Public Service Commission of Missouri" shall also apply, and be deemed to
refer, to any regulatory body which may (1) succeed said Commission with
respect to jurisdiction over the accounting of the Company, or (2) supersede
said Commission with respect to such jurisdiction, or (3) have such
jurisdiction over phases of the Company's business or parts of its property
over which said Commission shall not have jurisdiction.
 
  Section 4.3. So long as any bonds of the 2012 Series are outstanding, the
Company shall not be entitled to have authenticated and delivered any bonds
pursuant to Article VI, Article VII or Article VIII of the Original Indenture,
except bonds which may be authenticated and delivered under Article VII of the
Original Indenture, without the receipt by the Trustee of a net earnings
certificate showing the net earnings to be as required by Section 6.05 of the
Original Indenture, unless (in addition to all other requirements for the
authentication and delivery of such bonds):
 
    (a) net earnings of the Company after provision for depreciation,
  depletion and amortization of property, for any 12 consecutive calendar
  months within the 15 calendar months immediately preceding the date on
  which such additional bonds are to be issued, shall have been not less than
  2 1/4 times the amount of the total annual interest charges upon the funded
  debt of the Company to be outstanding immediately after the issue of such
  additional bonds; and
 
    (b) the Trustee shall have received a certificate made, signed and
  verified by the same persons (including an independent public accountant
  where required) as would be required if such certificate were a net
  earnings certificate under the Original Indenture, showing the net earnings
  of the Company to be as required by the foregoing clause (a) of this
  Section 4.3. Such certificate shall show the net earnings and total annual
  interest charges referred to in said clause (a).
 
  For the purposes of this Section 4.3, "funded debt" shall mean all
indebtedness created or assumed by the Company maturing one year or more after
the date of the creation or assumption thereof.
 
  For the purposes of this Section 4.3, net earnings of the Company after
provision for depreciation, depletion and amortization of property shall mean
the total operating revenue and other income (net) of the Company less
operating expenses (including provision for depreciation, depletion and
amortization of property) and less taxes (excluding income and excess profits
taxes or other taxes which are imposed on or measured by income). In the
determination of net earnings of the Company the following additional
requirements shall be applicable:
 
    (i) No profits or losses from the sale or abandonment of capital assets
  or change in value of securities or other investments shall be taken into
  account in making such computations;
 
    (ii) In case the Company shall have sold any property for a consideration
  in excess of $5,000,000, within or after the particular period for which
  the calculation is made, then, in computing the net earnings of the Company
  so available, the net earnings or net losses of such property for the whole
  of such period shall be excluded to the extent practicable on the basis of
  actual earnings and expenses of such property or on the basis of such
  estimates of the earnings and expenses of such property as the signers of a
  Treasurer's certificate filed with the Trustee shall deem proper;
 
    (iii) In case the Company shall, within or after the particular period
  for which the calculation is made, have acquired (by purchase, merger,
  consolidation or otherwise) any property which within six months prior to
  the date of acquisition thereof by the Company has been used or operated by
  a person or persons other than the Company in a business similar to that in
  which it has been or is to be used or operated by the Company, then in
  computing the net earnings of the Company so available for such purposes
  there shall be included, to the extent that they may not have been
  otherwise included, the net earnings or net losses of the property so
  acquired for the whole of such period to the extent practicable on the
  basis of actual earnings and expenses of such property or on the basis of
  such estimates of the earnings and expenses of such property as the signers
  of a Treasurer's certificate filed with the Trustee shall deem proper. The
  net earnings or net losses of such property for the period preceding such
  acquisition shall in such case be ascertained and computed as provided in
  this clause (iii) as if such acquired property had been owned by the
  Company during the whole of such period;
 
                                      16
<PAGE>
 
    (iv) The "net earnings of property" referred to in clauses (ii) and (iii)
  of this Section 4.3 shall mean the net earnings of such property computed
  in the manner provided in this definition for the computation of net
  earnings of the Company available for the pertinent purposes.
 
  All accounting determinations required by this Section 4.3 shall (except to
the extent, if any, to which the preceding provisions of this Section 4.3 may
conflict with this provision) be made according to the applicable system of
accounts prescribed by the Public Service Commission of Missouri and any
applicable orders of said Commission and (to the extent not prescribed by such
system of accounts or orders) according to generally accepted accounting
principles.
 
  For the purposes of this Section 4.3, the term "Public Service Commission of
Missouri" shall be applicable as provided in Section 4.2 of this Article IV.
 
  Section 4.4. So long as any bonds of the 2012 Series are outstanding, in
order that any interest payment on the bonds of the 2012 Series may be
postponed pursuant to clause (2) of Section 20.07 of the Original Indenture,
there shall be required, in addition to all other prerequisites to such
postponement provided in the Original Indenture, the consent of the owners of
not less than seventy-five percent (75%) in principal amount of bonds of the
2012 Series at the time outstanding, such consent to be given at the same time
as and in the same manner as the consent of the owners of other bonds required
by said clause (2) of Section 20.07 of the Original Indenture.
 
                                   ARTICLE V
 
                                 Miscellaneous
 
  Section 5.1. In any case where the date of maturity of interest on or
principal of bonds of the 2012 Series or the date fixed for redemption of any
such bonds shall be in the Borough of Manhattan, The City of New York, or in
the City of St. Louis, State of Missouri, a legal holiday or a day on which
banking institutions are authorized by law to close, then payment of interest
or principal need not be made on such date, but may be made on the next
succeeding date not in The City of New York, or in the City of St. Louis, a
legal holiday or a day on which banking institutions are authorized by law to
close, with the same force and effect as if made on the date of maturity or
the date fixed for redemption, and no interest shall accrue for the period
after such date.
 
  Section 5.2. If and to the extent that any provision hereof or any other
provision of the Mortgage, limits, qualifies, or conflicts with another
provision included in the Mortgage which is required to be included in the
Mortgage by any of Sections 310 to 317, inclusive, of the Trust Indenture Act
of 1939, as amended by the Trust Reform Act of 1990, through operation of
Section 318(c) thereof, such required provisions shall control.
 
  Section 5.3. The Trustee hereby accepts the trust hereby declared and
provided and agrees to perform the same upon the terms and conditions in the
Original Indenture and in this Twenty-Third Supplemental Indenture set forth.
 
  Section 5.4. This Twenty-Third Supplemental Indenture is executed and shall
be construed as an indenture supplemental to the Original Indenture and shall
form a part thereof.
 
  Section 5.5. This Twenty-Third Supplemental Indenture may be simultaneously
executed in any number of counterparts, each of which, when so executed, shall
be deemed to be an original; but such counterparts shall together constitute
but one and the same instrument.
 
  Section 5.6. Although this Twenty-Third Supplemental Indenture is dated, for
convenience and for purposes of reference, as of October 15, 1997, the actual
dates of execution by the Company and by the Trustee are as indicated by their
respective acknowledgements hereto annexed.
 
 
                                      17
<PAGE>
 
  In Witness Whereof, Laclede Gas Company, party of the first part, has caused
its corporate name to be hereunto affixed and this instrument to be signed and
sealed by its Executive Vice President--Operations and Marketing, and its
corporate seal to be attested by its Secretary or an Assistant Secretary, for
and in its behalf; and State Street Bank and Trust Company of Missouri, N.A.,
Trustee, party of the second part, in token of its acceptance of the trust
hereby created, has caused its name to be hereunto affixed and this instrument
to be signed and sealed by a Vice President, and its seal to be attested by
its Vice President or an Assistant Vice President.
 
                                          Laclede Gas Company
 
                                          By /s/ D.H. Yaeger
                                             -----------------------------
                                                      D. H. Yaeger
                                               Executive Vice President--
                                                 Operations and Marketing
ATTEST:
       /s/ D.L. Godiner
       --------------------------
          D. L. Godiner
              Secretary
 
(SEAL)
 
                                          State Street Bank and Trust Company
                                           of Missouri, N.A.,Trustee
 
                                          By  /s/ Susan R. James
                                              -------------------------------
                                                     Vice President
 
ATTEST:
 
/s/ Robert Clasquin
- ------------------------------------
      Assistant Vice President
 
(SEAL)
 
 
                                      18
<PAGE>
 
State of Missouri
                ss.
City of St. Louis
 
  On this 17th day of October, 1997 before me appeared D. H. Yaeger, to me
personally known, who, being by me duly sworn did say that he is the Executive
Vice President--Operations and Marketing of Laclede Gas Company, the
corporation described in and which executed the foregoing instrument, and that
the seal affixed to the foregoing instrument is the corporate seal of said
corporation and that said instrument was signed and sealed in behalf of said
corporation by authority of its board of directors, and said D. H. Yaeger
acknowledged said instrument to be the free act and deed of said corporation.
 
  In Witness Whereof, I have hereunto set my hand and affixed my official seal
in my office in the City of St. Louis, Missouri, the day and year last above
written.
 
  My commission expires June 11, 2000.
 

                                          /s/ Adele M Follmer
                                          -----------------------------------
                                          Notary Public
                                          State of Missouri
(SEAL)
 
                                      19
<PAGE>
 
State of Missouri
                ss.
City of St. Louis
 
  On this 17th day of October, 1997 before me appeared Susan R. James to me
personally known, who, being by me duly sworn did say that (s)he is a Vice
President of State Street Bank and Trust Company of Missouri, N.A., the national
banking association described in and which executed the foregoing instrument,
and that the seal affixed to the foregoing instrument is the seal of said
association and that said instrument was signed and sealed in behalf of said
association by authority of its board of directors, and said Susan R. James
acknowledged said instrument to be the free act and deed of said association.
 
  In Witness Whereof, I have hereunto set my hand and affixed my official seal
in my office in the City of St. Louis, Missouri, the day and year last above
written.
 
  My commission expires June 11, 2000.

                                          /s/ Adele M. Follmer
                                          -------------------------------------
                                          Notary Public
                                          State of Missouri
(SEAL)
 
 
                                      20


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