FRACTURE OF FLINT. 



65 



length of as much as ten inches, thus forming a blade-like 

 flake (figs. 62-69), with a triangular cross section (fig. 70). 

 The consequence is, that a perfect flint flake will always have 

 a small bulb, or projection (fig. 63 a) at the butt end, on the 

 flat side ; this has been called the bulb, or cone of percussion. 

 After the four original angles of a square block have been thus 

 flaked off, the eight new angles may be treated in a simi- 

 lar manner, and so on. Fig. 61, and pi. 1, fig. 6, represent 

 blocks, or cores, from FlG - 62 - FlG - 63 - FlG - 64 - 



which flakes have been 

 struck off. A flake it- 

 self is represented in pi. 

 1, fig. 7, and a very large 

 one from Fannerup in 

 Jutland is figured, one- 



Flint core or nucleus. 



Flint FlakeDenmark. 



half of the natural size, in figs. 62-64. The bulb is shown 



5 



