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absorption air seasoning American Wood-Preservers Ammonium phosphate amount of preservative annual applied attack average Baechler Bateman buildings cell cent chemicals coal-tar creosote coatings commercial concrete considerable construction cost crossties cubic foot decay definite deterioration Douglas fir durability eastern hemlock effect empty-cell exposed extent fire Forest Products Laboratory full-cell fungi fungus hardwoods heartwood heating holes hyphae impregnated incising increase insects installation Interior western less lumber marine borers material mercuric chloride method moisture content obtained operation paint patented penetration petroleum pits plant Poles and piling posts practice preservative oils preservative treatment pressure period Proc protection railway relatively resistance salt sapwood shipworms sodium sodium fluoride softwoods solution southern pine species specific gravity stain steaming structures suitable surface tank temperature termites tests tion tive toxic tracheids track treated timber treated wood treating cylinder U.S. Forest Products untreated usually vacuum wood-destroying fungi zinc chloride