17. Contracts for Mail Services should be very carefully prepared, and no contract should be forwarded for the signature of the Postmaster General unless correct in all its terms and provisions.
18. The contract should specify all the offices served en route.
19. All contracts sent for the Postmaster General's signature must be accompanied by the printed form or letter, in which should be entered separately and alphabetically:—
1. Contracts entered into without change of service;
2. Contracts for new services.
Against each contract should be entered the number and date of the letter under authority of which the contract was made.
Against the entry of each new contract it should be clearly stated whether the service is entirely a new one. If not, the names of the contract or contracts which it supersedes should be given.
20. Every contract made upon an accepted tender should (when sent to the Department) be accompanied by the tender on which it is based.