Rule 8 provides: "Where the consideration payable to Government under a forest contract is payable in instalments and the Divisional Forest Officer at any time before the last instalment is paid, considers that the value of the forest produce removed by the contractor exceeds the amount of the instalments already paid, the Divisional Forest Officer may stop further removal until the contractor has paid such further sum as may, in his opinion, be sufficient to cover such excess: Provided that, if in the opinion of any Forest Officer not below the rank of a Range Officer, it is necessary to take immediate action to prevent a breach of this rule, such Forest Officer (i) may by notice in writing serve on the contractor or his agent, if any, stating the grounds for the direction, require the contractor or his agent to stop further removal of the forest produce from the contract area; and By r. 12 a forest contractor is prohibited from removing any forest produce from the contract area, unless it is accompanied by a pass in the prescribed form signed by the contractor or his authorized agent.