Duty remission for natural loss permits relief when volatile warehoused goods suffer storage-related evaporation or depletion. Remission of customs duty is available where warehoused goods are deficient due to natural loss, with administrative discretion exercised by customs officers; an issued notification identifies categories of volatile or storage-sensitive goods-including fuels in tanks, alcoholic beverages in casks, certain gases in containers, and crude in caverns-for which such remission is contemplated based on volatility and storage method.