of the channels or other waterways of the port." Sec. 33 says:
"The exclusive control of the port and of the shipping, light- houses, lightships, leading lights and marks, buoys, beacons, moorings, wharves, docks, piers, jetties, ferries stages, slips or platforms, and the preservation and improvement of the port generally, are hereby vested in the Commissioners." Sec. 80 empowers them to make regulations on various enuine- rated subjects, one of which is (h) 'the improvement and manage- ment of the port." Then follows a general provision in these words :- And generally for duly administering and carrying out the powers vested in the Commissioners by this Act." I am of opinion that under one or the other of these clauses the Com- missioners have power to make by-laws to prevent the silting up of the channels of the port, and that a provision for preventing rubbish from being allowed negligently to fall into the water is within that power.
But, it is said, and this argument seems to have impressed the learned Judge of the Supreme Court, the legislature has already dealt with this subject. Sec. 86 provides that:-" Every person who unloads, puts, or throws into any part of the port or on any shore or ground in the port below high-water mark at ordinary tides, any rubbish, earth, ashes, dirt, mud, soil, or other matter, or allows any offensive matter to flow into the port, shall forfeit for every such offence any sum not exceeding one hundred pounds."
It will be observed at once that that section deals only with acts of commission, not with acts of omission, and it does not, it appears to me, cover nearly all the cases which it is necessary to cover in order to prevent the silting up of the waters of the port. I quite agree that if the legislature deals with a particular act, and prescribes the conditions under which it will be lawful and those under which it will be unlawful, the subordinate authority cannot, under the pretence of making a by-law, alter the law as SO declared by the legislature. But when the legisla- ture does not do that, then SO far as the matter is left untouched by the express provisions of the Act, the powers of the delegated authority to deal with it by by-law are not affected. It appears to me that this by-law does not make unlawful anything that the legislature has declared to be lawful, and therefore it is not