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ware (d) Enamel Enamelled Majolica metal proper (e) Reduced glaze Lustres over glaze The table can be extended indefinitely to include all the variations of glaze over glaze or glaze over coloured body, etc., which were pointed out in Chapter VIII. (page 61) 84 CERAMIC CHEMISTRY. CHAPTER XIV. RESEARCH. The chief problems in ceramics on which research is needed trench on the sciences of geology, chemistry, and physics. The origin of clay from rocks other than fels- pathic, the exact composition of such clays, the presence of combined water, the cause of plasticity, the influence of subdivision and of the presence of small quantities of impurities, the proximate analysis of clay, the physical chemistry of fusing silicates all these should be elucidated quite apart from the technical difficulties of manufacture. The latter are vital from the commercial point of view, and as the future of English pottery is concerned with the highest class of ware, the following statistics for which I am