92 



SCIENCE PROGRESS 



implements, and long before rostro-carinates were discovered 

 were collected and preserved as " side-choppers." But there 

 can be little doubt that such specimens are simply rostro- 

 carinate implements in a high state of development, and more- 

 over their method of manufacture is fundamentally the same 

 as that followed in the production of the more primitive imple- 



Tcst 



JUW\.T USTBJOL SutfNLt. 



f\NT 



urr uvTfcfcM. snwiKt. 



.ANT 



...REEL. 



PQ&T 



SECTION- 



-^fcEL 



KftT 



?ost 



Fig. 4. 



ments illustrated in figs. 2 and 3. This fact can be easily cor- 

 roborated by any one prepared to experiment in flint flaking on 

 his own account. 



Fig. 5. — It seems that the palaeolithic workmen having 

 realised the advantage of a cutting-edge extending the whole 

 length of the dorsal surface of their implements, realised also 

 that it would be a great advantage to have at their disposal 



