It is Impossible to form any reasonable, estimate of the 
number of successful nuclei produced, and carried away, 
but the product of the work on this site lust have been 
s 
enormous. Examples of the exhausted cores found widely 
distributed o\ r er the valley of Mexico are shown in figure 
Beside the re jectage of nuclei -making and the hammer 
stones already referred to, a few other varieties of arti- 
facts were obtained on the quarry site. In some of the 
heaps of refuse there were found, a number of scraper- 
% 
like objects (fig tf), made by taking a long, thick flake 
with one smooth, concave side, and removing a few chips 
around the margin of the wider end on the convex face 
giving a keen scraping edge. It is surmised that these 
were employed in shaping and sharpening the wood and 
antler tools required in the quarry shop work. 
v 
