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**Exhibit      31.2**

**MLM      INDEXTM FUND**

| 1) | I                have reviewed this report on Form 10-Q of MLM IndexTM                Fund; |
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| 2) | Based                on my knowledge, this report does not contain any untrue statement                of a                material fact or omit to state a material fact necessary to make                the                statements made, in light of the circumstances under which such statements                were made, not misleading with respect to the period covered by this                report; |
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| 3) | Based                on my knowledge, the financial statements, and other financial information                included in this report, fairly present in all material respects                the                financial condition, results of operations and cash flows of the                registrant as of, and for, the periods presented in this                report; |
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| 4) | The                registrant’s other certifying officers and I are responsible for                establishing and maintaining disclosure controls and procedures (as                defined in Exchange Act Rules 13a-14 and 15d-14) and internal control                over                financial reporting (as defined in Exchange Act Rules 13a-15(f) and                15d015(f)) for the registrant and we                have: |
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|   | a) | designed                such disclosure controls and procedures, or cause such disclosure                controls                and procedures to be designed under our supervision, to ensure that                material information relating to the registrant, including its                consolidated subsidiaries, is made known to us by others within those                entities, particularly during the period in which this report is                being                prepared; |
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|   | b) | designed                such internal control over financial reporting, or caused such internal                control over financial reporting to be designed under our supervision,                to                provide reasonable assurance regarding the reliability of financial                reporting and the preparation of financial statements for external                purposes in accordance with generally accepted accounting                principles; |
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|   | c) | evaluated                the effectiveness of the registrant’s disclosure controls and procedures                and presented in this report our conclusions about the effectiveness                of                the disclosure controls and procedures, as of the end of the period                covered by this report based on such evaluation;                and |
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|   | d) | disclosed                in this report any change in the registrant’s internal control over                financial reporting that occurred during the registrant’s fourth fiscal                quarter that has materially affected, or is reasonably likely to                materially affect, the registrant’s internal control over financial                reporting; and |
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| 5) | The                registrant’s other certifying officers and I have disclosed, based on our                most recent evaluation, to the registrant’s auditors and the audit                committee of registrant’s board of directors (or persons performing the                equivalent function); |
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|   | a) | all                significant deficiencies in the design or operation of internal control                over financial reporting which are reasonably likely to adversely                affect                the registrant’s ability to record, process, summarize and report                financial information; and |
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|   | b) | any                fraud, whether or not material, that involves management or other                employees who have a significant role in the registrant’s internal control                over financial reporting. |
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|   | By:                /s/ James A. Mehling             |   |
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|   | James                A. Mehling, Vice President and |
|   | Chief                Operating Officer of           |
|   | Mount                Lucas Management Corporation   |

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