TABLE OF CONTENTS AND SCHEME OF CLASSIFICATION. 



1. Piemen ts: l'aj?o. 



1. Carbon 1(5 



Diamond 165 



Graphite 168 



2. Sulphur 174 



3. Arsenic 182 



4. Allemontite 182 



II. Sulphides and arsenides: 



1. Realgar 183 



2. Orpiment ; auripigment, _ 1 83 



3. Cobalt minerals 184 



Cobaltite 184 



Smaltite 185 



Skutterudite 186 



Glaucodot 1 8(> 



Linna'ite 1 86 



Sychnodymite _ 187 



Erythrite or cobalt bloom 187 



Asbolite 1 87 



4. Arsenopyrite; mispickel or arsenical pyrites 1 89 



5. Lollingite; leucopyrite 18!) 



6. Pyrites 190 



7. Molybdenite 193 



III. Halides: 



1. Halite; sodium chloride; or common salt 195 



2. Fluorite 213 



3. Cryolite 214 



IV. Oxides: 



1. Silica 215 



Quartz 215 



Flint 216 



Buhrstone 217 



Tripoli 217 



Diatomaceous or infusorial earth 218 



2. Corundum and emery 220 



3. Bauxite 229 



4. Diaspore 239 



5. Gibbsite; hydrargillite 239 



6. Ocher 239 



7. Ilmenite; menaccanite; or titanic iron 245 



8. Rutile 245 



9. Chromite 246 



10. Manganese oxides 252 



Franklinite 253 



Hausmannite 253 



159 



