EXPLANATION OF PLATE III. 



Used Flakes. 



(One-half actual size.) 



Outer flakes of common sizes, showing various modifications of the edge and sur- 

 face. The sketches show details more clearly. 



1. Worn and striated edge throughout the greater part of the circumference, but 



lesser curves more worn. (PI. V, fig. a.) Small portion of rough surface 

 ground and striated. 



2. Edge worn, chipped and striated for greater parj; of circumference; degree of 



wear greater than in No. 1. Surface not ground. 



3. Edge worn and chipped. Surface much ground and striated in broken circles. 



(Right hand, PI. V, fig. e.) 



4. Edge worn and slightly chipped. Surface much ground and striated in straight 



lines across the flake. (PL V, fig. /.) 



5. Worn and chipped edge. Surface not ground. 



6. Edge worn without striations. (PI. V, fig. c.) 



7. Flaked edge (possibly designed). Wear mainly of the character of grinding, the 



striations running on to the surface. Right hand. (PI. V, tig. b.) 



