The postmaster is required to make selection for a vacancy from not more than the highest three names on the appropriate register, and for the next and any additional vacancies from not more than the highest three remaining which have not been within his reach for three separate vacancies. The name of an eligible must have been within reach for three separate vacancies in a position before it may be passed over in making selection for appointment to that position. When an eligible’s name is borne on both the clerk and the carrier registers and has been three times certified (considered) for one of the two positions, but not selected, his name will not be further certified for that position, but his standing on the register for the other position will not be affected. Neither will declination of appointment when selected for one of the positions affect the eligible’s standing on the register for the other position. Appointment to either position will remove the eligible’s name from the registers for both positions. An eligible who has been within reach for three separate vacancies in either the position of clerk or of carrier in his turn may subsequently be selected for the position, subject to the approval of the Commission, from the certificate upon which his name last appeared, if the condition of the register has not so changed as to place him in other respects beyond reach of certification. In the Post Office Service appointments are usually made to the position of substitute clerk or substitute carrier. Substitutes are promoted in the order of their original appointment to the first vacancies occurring in regular positions. Declination of appointment as substitute will remove the name of the eligible from the register from which selection was made, and it will not be restored for consideration in connection with appointment to a regular position only. Auxiliary employees are paid for actual service at the rate of 30 cents an hour. They are required to work not less than two hours daily, and may serve as substitutes. They are eligible for appointment as clerks and carriers of the first grade. All promotions of both clerks and carriers will be made at the beginning of the quarter following the expiration of the year’s service in the next lower grade. No promotion will be made except upon evidence satisfactory to the Post Office Department of the efficiency and faithfulness of the employee during the preceding year. When a clerk or carrier fails of promotion because of unsatisfactory service, he may be promoted at the beginning of the second quarter thereafter, or of any subsequent quarter, upon evidence that his record has been satisfactory during the intervening period. Clerks and carriers of the highest grade are eligible for promotion to the higher positions in their respective offices.