X TABLE OF CONTENTS. 



PAGE 



Magnesian limestones as sources of magnesia 156 



Occurrence of magnesium limestones in the United States 156 



Analyses of magnesium limestones 156 



Extraction of magnesia from magnesian limestones 157 



Scheibler process 157 



Closson process 158 



Sea-water and brines as sources of magnesia o . 158 



Extraction of magnesia from sea-water 159 



References on magnesite, sources of magnesia, etc 159 . 



CHAPTER XII. 



MAGNESIA BRICKS AND OXYCHLORIDE CEMENTS. 



Magnesia bricks 160 



Manufacture of magnesia bricks 160 



Composition of magnesia bricks 161 



Physical properties of magnesia bricks 161 



References on magnesia bricks 162 



Oxychloride cements 162 



Sorel's discovery 162 



Manufacture of oxychloride cements 162 



Manufacture and properties of Sorel stone 163 



Manufacture 163 



Strength 165 



Durability 165 



Costs 167 



References on oxychloride cements, Sorel stone, etc 167 



PART IV. HYDRAULIC LIMES, SELENITIC LIMES, AND 

 GRAPPIER CEMENTS. 



CHAPTER XIII. 



THE THEORY OF HYDRAULIC LIMES. 



General discussion 168 



The Hydraulic Index 168 



The Cementation Index 170 



Use of the Cementation Index in classification 171 



Definition of hydraulic limes 172 



Subgroups of hydraulic limes 173 



CHAPTER XIV. 



EMINENTLY HYDRAULIC LIMES: GRAPPIER CEMENTS. 



Eminently hydraulic limes 174 



Composition of the ideal hydraulic lime 471 



Composition of the actual product 175 



Raw materials; hydraulic limestones 176 



Burning hydraulic lime ... 179 



Slaking the lime . 177 





