Article 39 1. In case of death or resignation of a member of the Commission the Chairman of the Commission shall immediately inform the Secretary General of the Organization of African Unity, who shall declare the seat vacant from the date of death or from the date on which the resignation takes effect. 2. If, in the unanimous opinion of other members of the Commission, a member has stopped discharging his duties for any reason other than a temporary absence, the Chairman of the Commission shall inform the Secretary General of the Organization of African Unity, who shall then declare the seat vacant. 3. In each of the cases anticipated above, the Assembly of Heads of State and Government shall replace the member whose seat became vacant for the remaining period of his term unless the period is less than six months. Article 40 Every member of the Commission shall be in office until the date his successor assumes office. Article 41 The Secretary General of the Organization of African Unity shall appoint the Secretary of the Commission. He shall also provide the staff and services necessary for the effective discharge of the duties of the Commission. The Organization of African Unity shall bear the costs of the staff and services. Article 42 1. The Commission shall elect its Chairman and Vice Chairman for a two-year period. They shall be eligible for re-election. 2. The Commission shall lay down its rules of procedure. 3. Seven members shall form the quorum. 4. In case of an equality of votes, the Chairman shall have a casting vote. 5. The Secretary General may attend the meetings of the Commission. He shall not participate in deliberations nor shall he be entitled to vote. The Chairman of the Commission may, however, invite him to speak. Article 43 11