Filling of casual vacancies.

When any vacancy occurs in the office of a member (other than an ex-officio member) of any authority or other body of the University before the expiry of the term of office of such member, the vacancy shall be filled up, as soon as conveniently may be, by the election, nomination, appointment or co-option, as the case may be, of a member who shall hold office so long only as the member in whose place he has been elected, nominated, appointed or co-opted, would have held it, if the vacancy had not occurred :

Provided that, if the vacancy be of an elected member of the Senate and occurs within six months preceding the date on which the term of office of such member expires, the vacancy shall not be filled.