( k ) The maintenance and enforcement in the Philippine Islands of the laws and treaties of the United States concerning commercial intercourse and immigration; the shipping, protection, and care of merchant seamen; the effecting of the return of deserting Am erican seamen to the United States; the exclusion of stowaways arriving in the Philippine Islands and the arrest, detention, and deportation of such as unlawfully disembark therein; and the supplying of subsistence and giving of aid to shipwrecked sailors  or other persons in distress, in conformity with maritime usage. (j) The construction, repair, maintenance and operation of vessels belonging to or under control of the Bureau; the maintenance, lighting, inspection, and superintendence of lighthouses; and the care and maintenance of buoys, beacons, lightships, navigatio n marks, and their appurtenances; and general superintendence over interisland water transportation. ( i ) The supervision and control over the handling of foreign mails arriving in the Islands, for the purpose of the collection of the lawful duty on dutiable articles thus imported and the prevention of smuggling through the medium of such mails. SECTION  1313 . Enforcement of Port Regulations of Philippine Health Service . — Customs officers and employees shall cooperate with the health authorities in the enforcement of the port quarantine regulations promulgated by the Philippine Health Service and  shall give effect to the same in so far as they are connected with matters of shipping and navigation. SECTION  1314 . Territorial Jurisdiction of Bureau of Customs . — For the due and effective exercise of the powers confided by law in the Bureau of Customs, and to the extent requisite therefor, said Bureau shall have the right of supervision and police autho rity over all seas within the jurisdiction of the [See 1340-1.] [2319-1 (Bur. Customs); Comp., 3870.] [2308-1 ( a ).] [355-396.] [355-3.] of smuggling and other frauds upon the customs. Copyright 2012 CD Technologies Asia, Inc. and Accesslaw, Inc. Philippine Law Encyclopedia 2011 389