14. "Wiedermann's Annalen." VII. p. 337. 15. "Geological Contemporaneity." 1862. 16. "Geological Magazine." IV. pp. 241, 299. 17. "La Céramique industrielle." A. Granger. Gauthier Frères. Paris. 1905. 18. "American Journal of Science." 1871. p. 180. 19. "The Hensbarrow District." J. H. Collins. Geological Survey. 1878. 20. "Monographs of the U.S.A. Geological Survey." XXVIII. C. R. van Hise. 1897. 21. "On Kaolinite and Pholerite." American Journal of Science. XLIII. 1867. 22. "The Nomenclature of Clays." J. W. Mellor. Eng. Cer. Soc. VIII. Hughes and Harber. Longton, Staffs. 1908. 23. "On the present distribution of Coal Balls." M. C. Stopes and D. M. S. Watson. Phil. Trans. Royal Society. B. Vol. CC. 1908. 24. "Natural History of Coal." E. A. N. Arber. Cambridge University Press. 1911. 25. "Modern Brickmaking." A. B. Searle. Scott, Greenwood and Son. London. 1911. 26. "Die verschiedene Arten der Verwitterung." J. M. van Bemmelen. Zeits. angewandte Chemie. LXVI. Leopold Voss Verlag. Hamburg. 1910. 27. "Pyrometrische Beleuchtung." Carl Bischof. Tonindustrie Zeitung. 1877. 28. "Die feuerfeste Tone." Carl Bischof. Quandt and Haendler. Leipzig. 1904. 29. "The Chemical Constitution of the Kaolinite Molecule." Trans. Eng. Cer. Soc. X. Hughes and Harber. Longton, Staffs. 1911. 30. "Tabellarische Uebersicht der Mineralien." P. Groth. Brunswick. 1898. 31. "West Virginia Geological Survey." III. 1906. 32. "Memoirs of the Geological Survey." London. 33. "The Publications of Stanford's Geographical Institute." London. 34. "Handbuch der gesam. Tonwarenindustrie." B. Kerl. Verlag der Tonindustrie Zeitung. 1910. 35. "Causal Geology." E. H. L. Schwarz. Blackie and Sons, Ltd. 1910. 36. "China Clay: its nature and origin." G. Hickling. Trans. Inst. Mining Engineers. 1908. INDEX Absorption, 40, 151 Absorptive power of clays, 40 Accumulation of clays, 84 Acid-proof ware, 113 Acids, effect of, 106, 151, 152 Adsorption, 40, 150 Agriculture, clays in, 5, 56, 57, 59, 61, 62, 63, 67 Air, 43, 85 Alkalies in clay, 38, 115, 133, 142, 143, 155 Alluvial deposits, 68, 87, 112, 132 Alum clays and shales, 57, 123, 124 Alum manufacture, clays for, 124 Alumina, 6 Alumina, free, 80, 82, 154 Alumina-silica ratio, 133, 159 Alumino-silicic acid, 6, 76, 81, 118, 155, 157 Aluminous clays, 82, 117 'Amorphous' clay, 107, 146 Analyses of clays, 16, 141, 144 Anauxite, 134 Architectural ware, 129, 130 Argillaceous earths, 1 Argillaceous limestone, 88, 132 Associated rocks, 48