Legislative review of subordinate instruments: legislature may modify or annul rules and notifications within prescribed sessional period. Every rule, regulation or notification made under the Act must be laid before the State Legislature for a total of thirty days, which may be in one or more successive sessions. If the Legislature, before the end of the session immediately following those sessions, agrees to modify or annul the instrument, it will thereafter operate only as modified or be of no effect; such modification or annulment does not prejudice the validity of anything previously done under the instrument.