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SCIENCE PROGRESS 



ments were fashioned tabular flint was not obtainable, as the 

 author has not yet found a sub-crag rostro-carinate made from 

 a piece of tabular flint, and the extensive diggings which have 



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Rv^VT UtttfAW SWWW*; 



been conducted have shown that this particular kind of flint 

 is hardly ever found in the detritus-bed. 



The pre-Crag people, however, had an abundance of flint 

 of very fine quality, in the form of nodules, with which to work, 

 but the more or less rounded surfaces of nodules did not afford 



