3.  The custom-house service shall include the officers and employees serving in any customs district whose employees number as many as five who have been or may hereafter be classified under the civil-service act; and whenever in any customs district whose officers and employees number less than five the number of officers and employees shall be increased to as many as five the Secretary of the Treasury shall at once notify the Commission of such increase and the officers and employees in said district shall be included within the classified service from the date of said increase.

4.  The post-office service shall include the officers and employees in any free-delivery post-office who have been or may hereafter be classified under the civil-service act; and whenever the free-delivery system shall be established in any post-office the Postmaster-General shall at once notify the Commission of such establishment and the officers or employees of said office shall be included within the classified service from the date of such establishment; and whenever by order of the Postmaster-General any post-office shall be consolidated with and made a part of a free-delivery post-office the Postmaster-General shall at once notify the Commission of such consolidation and from the date of said order the employees of the office thus made a part of the free-delivery office whose names appear on the roster of the Post-Office Department shall be employees of said free-delivery office, and the person holding on the date of said order the position of postmaster at the office thus made a part of said free-delivery office may be made an employee in said free-delivery office and may at the time of classification be assigned to any position therein and given any appropriate designation which the Postmaster-General may direct.

  5.  The Government printing service shall include the officers and
  employees in the Government Printing Office who have been or may
  hereafter be classified under the civil-service act.

  6.  The internal-revenue service shall include the officers and employees
  who have been or may hereafter be classified under the civil-service act
  in any internal-revenue district.

  7.  All officers and employees who have heretofore been classified under
  the civil-service act shall be considered as still classified and
  subject to the provisions of these rules.

  8.  The following-mentioned positions or employees shall not be subject
  to the provisions of these rules: