Section 68. Execution of contracts

(1) Every contract made by or on behalf of a Board whereof the value or the amount exceeds fifty rupees shall be in writing. (2) Every such contract shall be signed - (a) by the Chairman or a Vice-Chairman and by the Secretary, or (b) by any person or persons empowered under sub-section (2) or sub-section (3) of section 67 to sanction the contract if further and in like manner empowered in this behalf by the Board. (3) If a contract to which the foregoing provisions of this section apply is executed otherwise than in conformity therewith, it shall not be binding on the Board: Provided that unless and until the contract has been duly executed in writing, no work including collection of materials in connection with the said contract shall be commenced.