284 LIST OF ILLUSTKATIONS. 



FIGUnES IN THK TEXT. 



Wardwell cbanneliug luachiue — 312 



Drilling holes preparatory to splitting by plug and feather 314 



Eclipse rock drill 321 



Improved quarry bar 3"2i 



Saunders channeling machine 322 



Saunders screw-frame channeling machine 323 



Gang of drills for channeling machine 323 



Diamond channeling machine 324 



Diamond gadder 325 



Ingersoll standard gadder 326 



Plain quarry frame 326 



McDonald stone-cutting machine 328 



Magnified section of fossiliferous limestone (25274), HamiltoHj Ohio 373 



Section of Mount Eolus, Vermont (after Hitchcock) 389 



