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specimen chipped at one end only. Nearly one-third of the worked 

 pebbles are chipped thus at one end only. Occasionally examples are 

 more elaborately worked, the fracturing having been continued until 



the original surface of the pebble 

 was nearly or wholly removed, the 

 resulting form being in cases thin 

 and somewhat rectangular in out- 

 lines (fig. 17) and again entirely 

 irregular. 



It is worthy of note that very 

 few of the pebbles were chipped 

 by strokes on the long margin 

 (fig. 18), this fact making it plain that the long side was not gener- 

 ally or even frequently intended to be elaborated as the edge of an 

 implement, as was usual in many sections; it is equally plain that 



Fig. 14. Neatly shaped grooved hammer of sand 

 stone. (^ actual size.) Punta Mogote. 



Fig. 15. Quartzite pebbles chipped at both ends, having a shuttle-like 

 outline. (J actual size.) Campo Peralta. 



flakes, if these were the object of the work, derived from the sides 

 were either difficult to make or on account of size, or shape, unsuited 

 for the purpose of the flaker. 



Fig. 16. Small jasper pebbles, one chipped Fig. 17. Pebbles chipped into subrectangular forms, 

 at both ends and the other at one end (^ actual size.) a, Jasper (Campo Peralta). h, Felsite 

 only. • (factual size.) Campo Peralta. (Miramar). 



It is observed that the pebbles selected for chipping were usually 

 oblong and flattish in form, these being chosen, undoubtedly, because 



