of the United States shall be found within the waters to which this act applies, and at a time when the killing of fur seals is by this act there prohibited, having on board seal skins or bodies of seals or apparatus or implements suitable for killing or taking seals, or if any licensed vessel shall be found in the waters to which this act applies having on board apparatus or implements suitable for taking seals, but forbidden then and there to be used, it shall be presumed that the vessel in the one case and the apparatus or implements in the other was or were used in violation of this act until it is otherwise sufficiently proved.

SEC. 11.  That it shall be the duty of the President to cause a sufficient naval force to cruise in the waters to which this act is applicable to enforce its provisions; and it shall be the duty of the commanding officer of any vessel belonging to the naval or revenue service of the United States, when so instructed by the President, to seize and arrest all vessels of the United States found by him to be engaged, used, or employed in the waters last aforesaid in violation of any of the prohibitions of this act or of any regulations made thereunder, and to take the same, with all persons on board thereof, to the most convenient port in any district of the United States mentioned in this act, there to be dealt with according to law.

SEC. 12.  That any vessel or citizen of the United States or person described in the first section of this act offending against the prohibitions of this act or the regulations thereunder may be seized and detained by the naval or other duly commissioned officers of Her Majesty the Queen of Great Britain, but when so seized and detained they shall be delivered as soon as practicable, with any witnesses and proofs on board, to any naval or revenue officer or other authorities of the United States, whose courts alone shall have jurisdiction to try the offense and impose the penalties for the came:  Provided, however, That British officers shall arrest and detain vessels and persons as in this section specified only after, by appropriate legislation, Great Britain shall have authorized officers of the United States duly commissioned and instructed by the President to that end to arrest, detain, and deliver to the authorities of Great Britain vessels and subjects of that Government offending against any statutes or regulations of Great Britain enacted or made to enforce the award of the treaty mentioned in the title of this act.

Now, therefore, be it known that I, Grover Cleveland, President of the United States of America, have caused the said act specially to be proclaimed, to the end that its provisions may be known and observed; and I hereby proclaim that every person guilty of a violation of the provisions of said act will be arrested and punished as therein provided, and all vessels so employed, their tackle, apparel, furniture, and cargo, will be seized and forfeited.