Section III. _And be it further enacted_, That if any citizen of the United States shall voluntarily serve on board of any foreign ship or vessel which shall hereafter be employed in the Slave-trade, he shall on conviction thereof, be liable to, and suffer the like forfeitures, pains, disabilities and penalties as he would have incurred had such ship or vessel been owned or employed in whole or in part by any person residing within the United States. Section IV. _And be it further enacted_, That it shall be lawful for any of the commissioned vessels of the United States, to seize and take any vessel employed in carrying on the trade, business or traffic contrary to the true intent and meaning of this or the said act to which this is in addition, and such vessel, together with her tackle, apparel and guns, and the goods or effects other than slaves which shall be found on board, shall be forfeited and may be proceeded against in any of the District or Circuit Courts, and shall be condemned for the use of the officers and crew of the vessel making the seizure, and be divided in the proportion directed in the case of prize; and all persons interested in such vessel, or in the enterprise or voyage in which such vessel shall be employed at the time of such capture, shall be precluded from all right or claim to the slaves found on board such vessels as afore said, and from all damages or retribution on account thereof, and it shall moreover be the duty of the commanders of such commissioned vessels to apprehend and take into custody every person found on board of such vessel so seized and taken, being of the officers or crew thereof, and him or them convey as soon as conveniently may be, to the civil, authority of the United States in some one of the Districts thereof, to be proceeded against in due course of law. Section V. _And be it further enacted_, That the District and Circuit Courts of the United States shall have cognizance of all acts and offences against the prohibitions herein contained. Section VI. _Provided nevertheless, and be it further enacted_, That nothing in this act contained, shall be construed to authorize the bringing into either of the United States any person or persons, the importation of whom is by the existing laws of such state prohibited. Section VII. _And be it further enacted_, That the forfeitures which shall hereafter be incurred under this or the said act to which this is in addition not otherwise disposed of, shall accrue and be one moiety thereof to the use of the informer, and the other moiety to the use of the United States, except where the prosecution shall be first instituted on behalf of the United States, in which case, the whole shall be to their use.