8.  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 regulation of the Commission.

INDIAN RULE IV.

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

(a) The Commissioner of Indian Affairs, through the Secretary of the Interior, shall, in form and manner to be prescribed by the Commission, request the certification to him of male or female eligibles from the district in which the vacancy exists.

(b) If fitness for the vacant place is tested by competitive examination, the Commission shall certify from the proper register of the district in which the vacancy exists the names of the three eligibles thereon of the sex called for having the highest averages:  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 the grade of matron or teacher, and the wife of the superintendent of the school in which the vacancy exists is an eligible, she may be given preference in certification if the appointing officer so requests.

2.  Of the three names certified to him the appointing officer 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 appointing officer to whom certification has been made shall object in writing to any eligible named in the certificate, 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 one objected to.

3.  Each person thus designated for appointment shall be notified, and upon indicating acceptance shall be appointed for a probationary period—­if a physician, for six months, and if a school employee, to expire at the end of the then current school year—­at the end of which period, if his conduct and capacity be satisfactory to the appointing officer, he shall receive absolute appointment; but if his conduct and capacity be not satisfactory to said officer he shall be so notified, and this notification shall be his discharge from the service:  Provided, That any probationer may be discharged during probation for misconduct or evident unfitness or incapacity.

4.  The Commissioner of Indian Affairs shall require the officer under whom a 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, habits, ability, and adaptability.  These reports shall be preserved on file, and the Commission may prescribe the form and manner in which they shall be made.