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0.5 per cent 100 milliliters 23 leathers acidity of 0.5 ANALYSES Arts on Leather backbone line bookbinding materials breaking load breaking strength Bureau of Chemistry centimeters Chemistry and Soils CN CN COCO Crede procedure cut parallel data degree of tannage Department of Agriculture Division of Tests durable bookbinding leathers ENGLISH BOOKBINDING LEATHERS failure of leather Farm Products Division free from injurious goatskin leathers Government Printing Office grams of leather Industrial Farm Products injurious acids Kohn and Crede leather bindings Leather for Bookbinding leather per 100 leathers showed milliliters of water number oil or grease pH value PHYSICAL EXAMINATION pounds Proctor and Searle r-co results right angles Royal Society Searle method showed acidity Society of Arts strength and stretch sumac tanned tanners tanning material Technical Control test pieces test section tester Tests and Technical Three were cut U. S. Department UNITED STATES GOVERNMENT whole skin