1. The classified customs service shall include the officers, clerks,
and other persons in the several customs districts classified under the
provisions of section 6 of the act to regulate and improve the civil
service of the United States, approved January 16, 1883.
2. Whenever the officers, clerks, and other persons in any customs
district number as many as fifty, any existing classification of the
customs service made by the Secretary of the Treasury under section 6 of
the act of January 16, 1883, shall apply thereto, and thereafter the
Commission shall provide examinations to test the fitness of persons to
fill vacancies in said customs district and these rules shall be in
force therein. Every revision of the classification of any customs
office under section 6 of the act above mentioned, and every inclusion
within the classified customs service of a customs district, shall be
reported to the President.