Casual vacancies

When the place of any appointed member of a Board becomes vacant by his removal, resignation or death, a new member shall be appointed in the manner provided in section 3: Provided that any person so appointed, shall be subject to retirement at the same time as if he had become a member of the Board on the day on which the member of the Board in whose place he is appointed, was appointed, elected or nominated a member of the Board: Provided further, that no act of the Board or of its officers shall be deemed to be invalid by reason only that the number of members of the Board at the time of the performance of such act was less than the number provided by section 3.