The Governor-General may from time to time, by Order in Council,—
(a) add to or omit from any of the lists of notifiable infectious diseases, infectious diseases, and notifiable diseases set out in Schedules 1 and 2 the name or description of any disease; or
(b) add to or omit from the list of offensive trades set out in Schedule 3, or the list of chemical works set out in Schedule 4, or the list of noxious or offensive gases set out in Schedule 5, the name or description of any trade, business, manufacture, undertaking, works, gas, or fumes,—
or otherwise amend any such list, and every such Order in Council shall have effect according to its tenor.