Provided always that in every case arising under the provisions of sub, section (5), (6), (7) and (8) of this Article no resolution for the expulsion of a member or if being a firm any member or authorised assistant of the firm shall be valid unless passed by a majority consisting of not less than two thirds of the members of the Committee at a meeting specially convened for the purpose and at which meeting not less than two thirds of the members of the committee at a meeting specially convened for the purpose and at which meeting not less than seven members of the Committee shah be present." 4 8 7 article 22 "Any member who has been declared a defaulter by reason of his failure to fulfil any engagement between himself and any other member or members and who fails to fulfil such engagements within six months from the date upon which he has been so declared a defaulter shall at the expiration of such period of six calendar months automatically cease to be a member.