108 new york state museum 



Part 3. 



PAGE 



Economic geology Igl 



Building stone 181 



Road metal 204 



Clay and clay products 208 



Shale and shale products 214 



Iron ores 214 



Lime and cement ......... 222 



Mineral paint 222 



Marl 223 



Millstones 223 



Salt 223 



Gypsum 224 



Graphite 22 i 



Quartz 224 



Glass sand 225 



Molding sand 225 



Garnet 225 



Emery . . 226 



Diatomaceous or Infusorial earth 226 



Talc 227 



Peat 227 



Petroleum and illuminating gas ., 227 



Natural carbonic acid gas 228 



Mineral waters 229 



Minerals not commercially important 231 



Part 4. 



Suggestions for study 236 



Geologic text-books and books of reference 236 



Field work 238 



The natural history survey of New York and the origin of the 



New York state museum 240 



Officers of the state museum 246 



