(a) In case of vacancy for any cause in any appointive office, such vacancy shall be filled in the manner herein provided for the appointment thereto, but only for the unexpired term of the office. In case of vacancy for any cause in an elective office, excepting Mayor and school commissioner, occasioned by death, resignation, removal from the City, or other disability, the office shall be filled by the Mayor by nomination and confirmation by the aldermen as hereinbefore provided. The appointment shall run until the next annual meeting and at such next annual meeting the legal voters of the City shall elect, from among their number, a person to fill such vacancy.

(b) The Mayor with the approval of the Board of Aldermen, shall make a temporary appointment within 15 days after receiving notice from a physician that any appointive officer is rendered incapable of performing the duties of that particular office.