TABLE OF CONTENTS. 



Part I. 



INTRODUCTORY. 



Page. 



A. Historical and general 285 



B. The minerals of building stones 292 



C. Physical and chemical properties of rocks 302 



(1) Density and hardness 302 



(2) Structure 302 



(3) State of aggregation 305 



(4) Eift and grain 306 



(5) Color . 306 



(6) Chemical characters 307 



D. Rock classification. (Table) 308 



E. Geological record. (Table) 309 



F. Methods of quarrying and dressing 310 



(1) Joints in rocks and their utility in quarrying ,. 310 



(2) Granite quarrying ,.,.„„,.. 311 



(3) Marble quarrying ... 311 



(4) Sandstone quarrying ... 312 



(5) Cutting and dressing 313 



(6) Quarrying and splitting slate 318 



(7) Kinds of finish 319 



G. Machines and implements used in stone working 320 



(1) Drills and drilling machines 320 



(2) Channeling machines 321 



(3) Gadding and gadding machines 324 



(4) Grinding and polishing machines 326 



(5) Lathes and planers 327 



(6) Saws 327 



(7) Sand-blast carving 329 



(8) Hand implements 329 



H. The weathering of building stones 331 



(1) Physical agencies promoting disintegration 331 



(2) Chemical agencies promoting disintegration 336 



(3) Induration of stone on exposure 339 



(4) Weathering properties of stones of various kinds 340 



I. On the selection of building stone 345 



(1) General considerations 345 



(2) Precautions to be observed 347 



(3) Comparative durability of stones of various kinds 349 



K. Methods of protection and preservation 352 



(1) Precautionary methods 352 



(2) Protection by means of solutions .* •» ** * *»•.»». » .»....* » «.» 354 



879 



