6.  When two or more eligibles are of the same grade, preference in
  certification shall be determined by the order in which the application
  papers are filed.

  7.  The period of eligibility to appointment shall be one year from the
  date on which the name of the eligible is entered on the register,
  unless otherwise determined by regulations by the Commission.

  RULE IV.

  1.  All vacancies, unless filled by promotion, transfer, or
  reappointment, shall be filled in the following manner: 

  (a) The Public Printer shall, in form and manner to be prescribed
  by the Commission, request the certification to him of either males or
  females, or both, eligible to the vacant place.

(b) If fitness for the vacant place is tested by competitive examination, the Commission shall certify from the proper register the names of the three eligibles thereon, of the sex or sexes called for, having the highest averages, who have not been three times certified:  Provided, That the eligibles upon any register who have been allowed preference under section 1754 of the Revised Statutes shall be certified according to their grade before all other eligibles thereon:  And provided further, That if the vacancy is in a position for which a competitive examination can not be provided certification shall be made of the names of the first three eligibles on the register, of the sex or sexes called for, who have not been three times certified.

2.  Of the three names certified to him the Public Printer shall select one, and if at the time of making this selection there are more vacancies than one he may select more than one:  Provided, That if the Public Printer shall object in writing to any eligible named in the certification, stating that because of physical incapacity or for other good cause particularly specified such eligible is not capable of properly performing the duties of the vacant place, the Commission may, upon investigation and ascertainment of the fact that the objection made is good and well founded, direct the certification of another eligible in place of the eligible to whom objection is made.

3.  When a person designated for appointment shall have reported in person to the Public Printer, he shall be appointed for a probational period of six months, at the end of which period, if his conduct and capacity be satisfactory to the Public Printer, he shall receive absolute appointment; but if his conduct and capacity be not satisfactory he shall be notified that he will not receive absolute appointment, and this notification shall discharge him from the service.  The Public Printer shall require the officer under whom the probationer may be serving to carefully observe and report in writing upon the services rendered by and the character and qualifications of such probationer as to punctuality, industry,