(_b_) _Containing Titanium Dioxide_--Æschynite; the isodimorphous series Euxenite, Polycrase, Blomstrandine, Priorite; Risörite, Wiikite; etc. V. THE OXIDES AND CARBONATES 72 (_a_) _Oxides_--Uraninite, Thorianite, Baddeleyite; Rutile, Anatase and Brookite; etc. (_b_) _Carbonates_--Lanthanite; Parisite (Synchisite), Cordylite; etc. VI. THE PHOSPHATES AND HALIDES 82 (_a_) _Phosphates_--Monazite, Xenotime (Hussakite); etc. (_b_) _Halides_--Yttrocerite, Yttrofluorite; etc. VII. THE MONAZITE SANDS 90 VIII. RADIOACTIVITY OF THE MINERALS 99 PART II _THE CHEMISTRY OF THE ELEMENTS_ IX. GENERAL PROPERTIES OF THE CERIUM AND YTTRIUM GROUPS 111 X. GENERAL METHODS OF SEPARATION 142 XI. THE CERIUM GROUP--CERIUM 156 XII. THE CERIUM GROUP (CONTINUED)--LANTHANUM, PRASEODYMIUM, NEODYMIUM, AND SAMARIUM 168 XIII. THE TERBIUM GROUP 184 XIV. THE ERBIUM AND YTTERBIUM GROUPS--YTTRIUM AND SCANDIUM 194 XV. THE GROUP IVA ELEMENTS--TITANIUM 219 XVI. THE GROUP IVA ELEMENTS (CONTINUED)--ZIRCONIUM AND THORIUM 238 PART III _THE TECHNOLOGY OF THE ELEMENTS_ XVII. THE INCANDESCENT MANTLE INDUSTRY--HISTORICAL AND GENERAL INTRODUCTION 265 XVIII. THE CHEMICAL TREATMENT OF MONAZITE 275 XIX. THE MANUFACTURE OF MANTLES FROM COTTON AND RAMIE 291 XX. ARTIFICIAL SILK--ITS PRODUCTION AND USE IN THE MANTLE INDUSTRY 301 XXI. OTHER TECHNOLOGICAL USES OF THE CERIUM AND YTTRIUM ELEMENTS, ZIRCONIUM AND THORIUM 313 XXII. THE INDUSTRIAL APPLICATIONS OF TITANIUM AND ITS COMPOUNDS 325 INDEX 342 TABLE OF ABBREVIATIONS EMPLOYED IN THE REFERENCES _Abstr. Chem. Soc._ Abstracts in Journal of the Chemical Society. _Amer. Chem. J._ American Chemical Journal. _Amer. J. Sci._ American Journal of Science. _Annalen_ Justus Liebig’s Annalen der Chemie. _Ann. Chim. Phys._ Annales de Chimie et de Physique. _Astrophys. J._ Astrophysical Journal. _Ber._ Berichte der Deutschen chemischen Gesellschaft.