CHAPTER XXVIII.

_WASTE PRODUCTS AND THEIR DISPOSAL._

Hair -- Fleshings and glue-stuff -- Fat -- Bate-shavings -- Horns -- Spent tan -- Tan-furnaces -- Sewage and other waste liquids -- Chemical purification of sewage -- Settling tanks -- Filter-presses -- Bacterial purification of sewage -- Tannery waste-liquors PAGE 460

APPENDIX A.

_METHOD OF THE INTERNATIONAL ASSOCIATION OF LEATHER-TRADES CHEMISTS FOR THE ANALYSIS OF TANNING MATERIALS: Corrected to 1901._

Sampling from bulk -- Preparation for analysis -- Preparation of infusion -- Determination of tanning matters and non-tannins -- Colour-measurement -- Analysis of used liquors PAGE 475

APPENDIX B.

_THE DECIMAL SYSTEM._

Metrical weights and measures -- Centigrade thermometer PAGE 481

APPENDIX C.

_METHOD OF ANALYSIS OF TANNING MATERIALS OF THE AMERICAN ASSOCIATION OF OFFICIAL AGRICULTURAL CHEMISTS: Corrected to 1901._

Preparation of sample -- Quantity of material -- Moisture -- Total solids -- Soluble solids -- Non-tannins -- Tannins -- Testing of hide-powder -- Testing non-tannin filtrate PAGE 482

APPENDIX D.

_LISTS OF COAL-TAR DYES SUITABLE FOR DYEING AND STAINING LEATHER, furnished by Mr. M. C. LAMB._

Colours for staining leather -- Colours for dyeing vegetable-tanned leather -- Dyeing and finishing chrome-leather -- List of colours suitable for chrome-leather PAGE 485

INDEX PAGE 499

PRINCIPLES OF LEATHER MANUFACTURE.