-7- 
specimens, four or five inches in diameter and somewhat 
die col dal or cheese-shaped, may have been employed in 
breaking the obsidian in the mass, but the smaller, many 
of which are globular in form, must have been used in 
the hand simply, or with a light haft attached, in the 
work of breaking up the fragments and in trimming; them 
down to the desired contour* The stone is usually a 
/ / 
tough lava, and the peripheries show the usual evidences 
I 
of battering* ■ 1 j 
f ' 
It is well known that the ancient dwelling bites of 
I ' ; 
the general region are strewn with countless knifes which 
JBB have been derived by fracture from cylindrical, faceted 
T3S . 
nuclei or partially exhausted, specimens of which! are widely 
h 
•l" 1 
distributed, and evidence of the getting out of these nuclei 
i 
was to be expected on the quarry site. Examination 
