00 DOMAIN II. SILICEOUS. 



a kind of tube or hollow borer, by the assistance 

 of emery, although no vestige of such an instru- 

 ment appear, the surface of the figures having 

 been polished by friction. It was natural that 

 the artists should study to save time in this kind 

 of work, and effect by saws, tuctri, and friction, 

 what appears to have been accomplished in the 

 great obelisk by the chisel or graving tool, or 

 emery rubbed with a blade. 



" 6. Our artists, when they wish to cut any 

 figure on granite, in the first place make a model 

 of a thin plate of iron, which being fastened to 

 the plane stone, they take another plate like a 

 short knife, and use it to cut a furrow, by the help 

 of emery, around the model first mentioned. The 

 furrow being thus impressed to a certain depth, 

 they take off the model, and begin to attack the 

 intermediate space with a sharp graver or chisel 

 called subbia. They then begin to form the figure, 

 with a little sharp hammer called pungetto ; and 

 afterwards soften it with a broader hammer called 

 martellino. This done, they polish it with lead 

 and emery ; and afterwards add the smaller linea- 

 ments, partly with a fine chisel, partly with the 

 blade in the form of a knife and emery. Lastly, 

 they polish the whole with the finest emery, called 

 spoltriglia. 



" 7. Del Rosso thought he discovered marks 



