1. The president of the association shall preside at all meetings, and shall be a member ex-officio of all committees.

2. In the absence of the president, the members of the council then present, shall choose one of the vice-presidents as chairman; and in the absence of the president and vice-presidents, the members of the Council then present may choose some one of their number as Chairman.

3. On an extraordinary vacancy of the office of president or of any other officer or in the executive council, a meeting of the executive council shall be summoned with as little delay as possible and a new president or other officer of the association or member of the council, as the case may be, shall be chosen to hold office until the next annual general meeting.