Before a clearance is granted to any vessel bound on a foreign voyage or engaged in the whale-fishery, the master thereof shall deliver to the collector of the customs a list containing the names, places of birth and residence, and description of the persons who compose his ship's company; to which list the oath of the captain shall be annexed, that the list contains the names of his crew, together with the places of their birth and residence, as far as he can ascertain them; and the collector shall deliver him a certified copy thereof. (R. S., 4573; June 19, 1886.) In all cases of private vessels of the United States sailing from a port in the United States to a foreign port, the list of the crew shall be examined by the collector for the district from which the vessel shall clear, and if approved of by him, shall be certified accordingly. No person shall be admitted or employed on board of any such vessel unless his name shall have been entered in the list of the crew, approved and certified by the collector for the district from which the vessel shall clear. The collector, before he delivers the list of the crew, approved and certified, to the master or proper officer of the vessel to which the same belongs, shall cause the same to be recorded in a book by him for that purpose to be provided, and the record shall be open for the inspection of all persons, and a certified copy thereof shall be admitted in evidence in any court in which any question may arise under any of the provisions of this Title [R. S., 4501-4613.] (R. S., 4574.) Failure to produce crew.