last preceding census.

3. In case the request for any such certification or any law or
regulation shall call for those of either sex, the four highest of that
sex shall be certified; otherwise sex shall be disregarded in such
certification.

4. No person upon any register shall be certified more than three times
to the same officer in the customs or postal service or more than twice
to any department at Washington, unless upon request of the appointing
officer; nor shall anyone remain eligible more than one year upon any
register. And no person while remaining eligible on any register shall
be admitted to a new examination of the same grade.

RULE XVII.

1. Every original appointment or employment in said classified service
shall be for the probationary period of six months, at the end of which
time, if the conduct and capacity of the person appointed have been
found satisfactory, the probationer shall be absolutely appointed or
employed, but otherwise be deemed out of the service.

2. Every officer under whom any probationer shall serve during any part
of the probation provided for by these rules shall carefully observe the
quality and value of the service rendered by such probationer, and shall
report to the proper appointing officer, in writing, the facts observed
by him, showing the character and qualifications of such probationer and
of the service performed by him; and such reports shall be preserved on
file.

3. Every false statement knowingly made by any person in his application
for examination and every connivance by him at any false statement made
in any certificate which may accompany his application shall be regarded
as good cause for the removal or discharge of such person during his
probation.

RULE XVIII.

Every head of a Department or office shall notify the Commission of the
name of every person appointed to or employed in the classified service
under him (giving the date of the appointment and the designation of the
office or place) from those examined under the Commission, and shall
also inform the Commission of the date of any rejection or final
appointment or employment of any probationer and of the promotion,
removal, discharge, resignation, transfer, or death of any such person
after probation.

RULE XIX.

There are excepted from examination the following: (1) The confidential
clerk or secretary of any head of a Department or office; (2) cashiers
of collectors; (3) cashiers of post