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Show Books Must Have Air Recent tests by the I'nlted States nureau of chemistry analyzing a large number ot worn leather houkhind ings, show that leal bet hooks need pure air and deteriorate when ex posed to harmful sulphurous and acid Ic impurities. Backs of leather hook deteriorate quicker than t lie sides because ordinarily they are more ex posed to light and impure air. 'In tests reveal. To prolong the life o treasured leather bindings. slep? should be taken to prevent t!i-;r delerioration 'hioiih the nlwiu t-t i ' of atmospheric impurities the bui"ai; advises Certain routings np'l fin ishrs. notably neat's foot :!( castt oil, are Slated to t tcellent for the purpose. |