Books (To Preserve). A few drops of any perfumed oil will secure libraries from the consuming effects of mould and damp. Russian leathter, which is perfumed with the tar of the birch tree, never moulders; and merchants suffer large bales of this leather to remain in the London docks, knowing that it cannot sustain any injury from damp. This manner of preserving books with perfumed oil was known to the ancients. The Romans used oil of cedar to preserve valuable manuscripts. Hence the expression used by Horace, "digna cedro," meaning any work worthy of being anointed with cedar-oil, or, in other words, of being preserved and remembered.