Departmental service.—­(a) Private secretaries or confidential clerks (not exceeding two) to the President or to the head of each of the eight Executive Departments; (b) Indians employed in the Indian service at large, except those employed as superintendents, teachers, teachers of industries, kindergartners, and physicians.

Custom-house service.—­(a) One cashier in each customs district; (b) one chief or principal deputy or assistant collector in each customs district whose employees number as many as 150.

Post-office service.—­(a) One assistant postmaster, or chief assistant to the postmaster, of whatever designation, at each post-office; (b) one cashier of each first-class post-office when employed under the roster title of cashier only.

  Internal-revenue service.—­One cashier in each internal-revenue
  district.

  RULE VII.

1.  Examination papers shall be rated on a scale of 100, and the subjects therein shall be given such relative weights as the Commission may prescribe.  After a competitor’s papers have been rated he shall be duly notified of the result thereof.

2.  Every competitor who attains an average percentage of 70 or over shall be eligible for appointment to the position for which he was examined, and the names of eligibles shall be entered in the order of their average percentages on the proper register of eligibles:  Provided, That the names of all competitors whose claims to preference under the provisions of section 1754 of the Revised Statutes have been allowed by the Commission, and who attain an average percentage of 65 or over, shall be placed in the order of their average percentages at the head of the proper register of eligibles.

3.  For filling vacancies in positions for which competitive tests are not practicable the registration of applicants shall be in the order in which they fulfill the requirements prescribed therefor by regulation of the Commission:  Provided, That persons who served in the military or naval service of the United States in the late War of the Rebellion and were honorably discharged therefrom, and persons who have been separated from such positions above mentioned through no delinquency or misconduct, shall be placed at the head of the proper register in the order of their fulfillment of said requirements.

  4.  The term of eligibility shall be one year from the date on which the
  name of the eligible is entered upon the register.

  RULE VIII.