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III. Clay Analysis - 17 IV. Raw Materials - 30 V. Bodies 37 VI. Glazes 46 VII. Enamels 52 VIII. The Production of Colour 59 IX. Firing of the Ware - 65 X. Loss in Manufacture - - - 71 XI. Industrial Disease - - - 75 XII. Testing of Finished Ware - - - 79 XIII. Classification of Pottery - 82 XIV. Research - . ... 84 XV. Bibliography in English - - 85 Index of Authors - 87 Index of Subjects 89 CERAMIC CHEMISTRY. vii. INTRODUCTION. Ceramic chemistry is concerned chiefly with the re- actions of silicates. It is complicated by the difference in conduct between body and glaze. In the latter, if properly matured, the chemical reaction between the constituents has proceeded to a finish, and the melt consists of a homogeneous mixture or solid solution of* silicates and, it majj be, borates and phosphates, and any eutectics that may be formed. With the body, on the other hand, it is different. The firing is only conducted to incipient vitrification, if as high as that. The chemical