494.—If at the time when any goods are landed from any ship, and placed in the custody of any person as a wharfinger or warehouseman, the shipowner gives to the wharfinger or warehouseman notice in writing that the goods are to remain subject to a lien for freight or other charges payable to the shipowner to an amount mentioned in the notice, the goods so landed shall, in the hands of the wharfinger or warehouseman, continue subject to the same lien, if any, for such charges as they were subject to before the landing thereof; and the wharfinger or warehouseman receiving those goods shall retain them until the lien is discharged as herein-after mentioned, and shall, if he fails so to do, make good to the shipowner any loss thereby occasioned to him.