The inspector shall make known to the master of such vessel the duties he is to perform; and shall suffer no merchandise to be unladen, or otherwise removed from such vessel, without a permit in writing from the collector of the port, and naval officer thereof, if any. The inspector shall enter in a book, to be by him kept according to such a form as shall be prescribed or approved by the collector, the name of the person in whose behalf such permits are granted, together with the particulars therein specified, and the marks, numbers, kinds, and description of the respective packages which shall be unladen pursuant thereto, and shall keep a like account in the book of all merchandise which, not having been entered within the time limited by this Title [R. S., 2517-3129], or for some other cause, has been sent to the store or warehouse provided for the reception of such merchandise; such book shall be delivered to the surveyor in the month of January in every year for his inspection, and immediately after such inspection be transmitted by the surveyor, with such observations as he may think necessary thereon, to the collector, to be deposited in his office. (R. S., 2876.) The inspector shall attend to the delivery of the cargo under his care, at all times when the unlading or delivery of merchandise is lawful, particularly from the rising to the setting of the sun on each day, Sundays and the fourth day of July in each year excepted; for which purpose he shall constantly attend and remain on board the vessel, the deliveries from which he is to superintend, or at any other station where his inspection is necessary. The inspector shall not quit such station or place without the leave of the surveyor of the port first obtained, who shall appoint another inspector, if he deems it necessary, to supply the place of such inspector during his absence; and any inspector who shall neglect or in any manner act contrary to the duties hereby enjoined, shall for the first offense be liable to a penalty of the sum of fifty dollars, and for the second offense shall be displaced, and be incapable of holding any station of trust or profit under the revenue laws of the United States, for a term not exceeding seven years. (R. S., 2877.)