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be citizens of the United States, and no others, may be registered as directed in this title. Foreignbuilt vessels registered pursuant to this Act shall not engage in the coastwise trade : Provided that a foreign-built yacht, pleasure-boat, or vessel not used or intended to be used for trade admitted to American registry pursuant to this section shall not be exempt from the collection of ad valorem duty provided in section 37 of the Act approved the sth August, 1909, entitled, 'An Act to provide Revenue, equalize Duties, and encourage the Industries of the United States, and for other Purposes.' That all materials of foreign production which may be necessary for the construction or repair of vessels built in the United States, and all such materials necessary for the building or repair of their machinery, and all articles necessary for their outfit and equipment, may be imported into the United States free of duty under such regulations as the Secretary of the Treasury may prescribe : Provided further that such vessels so admitted under the provisions of this section may contract with the Postmaster-General under the Act of the 3rd March, 1891, entitled, ' An Act to provide for Ocean Mail-service between the United States and Foreign Ports, and to promote Commerce,' so long as such vessels shall in all respects comply with the provisions and requirements of said Act." Tolls may be based upon gross or net registered tonnage, displacement tonnage, or otherwise, and may be based on one form of tonnage for warships and another for ships of commerce. The rate of tolls may be lower upon vessels in ballast than upon vessels carrying passengers or cargo. When based upon net registered tonnage for ships of commerce the tolls shall not exceed 1 dol. 25 c. per net registered ton, nor be less,, other than for vessels of the United States and its citizens, than the estimated proportionate cost of the actual maintenance and operation of the canal, subject, however, to the provisions of Article 19 of the convention between the United States and the Republic of Panama, entered into the 18th November, 1903. If the tolls shall not be based upon net registered tonnage they shall not exceed the equivalent of 1 dol. 25 c. per net registered ton, as nearly as the same may be determined, nor be less than the equivalent of 75 cents per net registered ton. The toll for each passenger shall not be more than 1 dol. 50 cents. The President is authorized to make and from time to time amend regulations governing the operation of the Panama Canal, and the passage and control of vessels through the same or any part thereof, including the locks and approaches thereto, and all rules and regulations affecting pilots and pilotage in the canal or the approaches thereto through the adjacent waters. Such regulations shall provide for prompt adjustment by agreement and immediate payment of claims for damages which may arise from injury to vessels, cargo, or passengers from the passing of vessels through the locks under the control of those operating them under such rules and regulations. In case of disagreement suit may be brought in the District Court of the Canal Zone against the Governor of the Panama Canal. The hearing and disposition of such cases shall be expedited, and the judgment shall be immediately paid out of any moneys appropriated or allotted for canal operation. The President shall provide a method for the determination and adjustment of all claims arising out of personal injuries to employees thereafter occurring while directly engaged in actual work in connection with the construction, maintenance, operation, or sanitation of the canal or of the Panama Railroad, or of any auxiliary canals, locks, or other works necessary and convenient for the construction, maintenance, operation, or sanitation of the canal, whether such injuries result in death or not, and prescribe a schedule of compensation therefor, and may revise and modify such method and schedule at any time; and such claims, to the extent they shall be allowed on such adjustment, if allowed at all, shall be paid out of the moneys hereafter appropriated for that purpose or out of the funds of the Panama Railroad Company, if said company was responsible for said injury, as the case may require. And after such method and schedule shall be provided by the President, the provisions of the Act entitled "An Act granting to certain Employees of the United States the Right to receive from it Compensation for Injuries sustained in the Course of their Employment," approved the 30th May, 1908, and of'the Act entitled ''An Act relating to Injured Employees on the Isthmian Canal," approved the 24th February, 1909, shall not apply to personal injuries thereafter received and claims for which are subject to determination and adjustment as provided in this section. Sec. 6. That the President is authorized to cause to be erected, maintained, and operated, subject to the International Convention and the Act of Congress to regulate radio-communication, at suitable places along the Panama Canal and the coast adjacent to its two terminals, in connection with the operation of the said canal, such wireless telegraphic installations as he may deem necessary for the operation, maintenance, sanitation, and protection of said canal, and for other purposes. If it is found necessary to locate such installations upon territory of the Republic of Panama, the President is authorized to make such agreement with said Government as may. be necessary, and also to provide for the acceptance and transmission, by said system, of all private and commercial messages, and those of the Government of Panama, on such terms and for such tolls as the President may prescribe : Provided that the messages of the Government of the United States and the Departments thereof, and the management of the Panama Canal, shall always be given precedence over all other messages. The President is also authorized, in his discretion, to enter into such operating agreements or leases with any private wireless company or companies as may best ensure freedom from interference with the wireless telegraphic installations established by the United States. The President is also authorized to establish, maintain, and operate, through the Panama Railroad Company or otherwise, dry-docks, repair-sho~ps. yards, docks, wharves, warehouses, storehouses, nnd other necessary facilities and appurtenances for the purpose of providing coal and other materials, labour, repairs, and supplies for vessels of the Government of the United States, and, incidentally,, for supplying such at reasonable prices to passing vessels, in accordance with appropriations hereby authorized to be made from time to time by Congress as a part of the maintenance and operation of the said canal. Moneys received