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and practical information on the chemistry of leather manufacture, most of which was developed in their respective laboratories. Fortunately the book was completed before the death of D r . McLaughlin. The chapters are as follows: 1. Introduction; 2. Histology of skin; 3. The composition and chemical structure of skin; 4 . Combination of proteins with acids, bases, salts and heavy metals; 5. Shrinkage temperature of collagen; 6. Microorganisms; 7 . Curing; 8. Soaking; 9. Liming and depilation; 10. Bating; 11. Pickling; 12. Aldehyde tanning; 13. Quinone tanning; 14. Chemistry of chromium salts; 15. Chrome tanning; 16. Theory of chrome tanning; 17. Vegetable tanning; 18. Theory of vegetable tanning; 19. Iron tanning; 20. Alum tanning; 21. Syntans; 22. Miscellaneous tannages; 23. Keutralizing; 24. Fatliquoring, oiling and stuffing leather and the materials employed; 25. Physical testing methods. Four of the twenty-five chapters were written by specialists in their respective fields: namely, Chapter 3, by John H. Highberger; Chapter 21, by Karl F. Ruppenthal; Chapter 24, by Ralph E. Porter; Chapter 25, by Warren E. Elmley. Every phase, from the green hide t o tanned leather, is covered. The reader is referred to Monograph Series No. 12 for the following subjects: dyes and finishes, patent leather, furs, and methods for microscopic and histological examination. This volume is indispensable to both the practical and the scientific-minded person in the tanning industry. The reviewer recommends it highly. AUG. C. ORTRMANN.
