The method of conducting the quarry work was 
substantially as follows: When a sufficient area of the 
solid stone had been uncovered, the workmen proceeded 
with pick and chisel to detach such portions as were 
desired* If this surface happened to be uneven, the 
projections or convexities were utilized, and the cut¬ 
ting was not difficult; if the rock was massive and the 
surface flat, a circular groove was cut, outlining the 
mass to be removed, and the cutting was continued until 
a depth was reached corresponding to the height of the 
utensil to be made; then, by undercutting, the nucleus 
was detached or so far severed that it could be broken 
off by means of sledges or levers. If the stone 
happened to be laminated, a circular groove was cut 
through at right angles to the bedding, and the dis¬ 
coid mass was removed without the need of undercutting. 
If the conditions were favorable, a second disk was 
