POPULAR SCIENCE 



433 



flints, and has selected six (together with three others) from 

 his own collection for illustration in this paper. In the delinea- 

 tion of these specimens a severely diagrammatic style has been 

 adopted, but each flake area is faithfully outlined, and the 

 arrows which indicate the direction in which the force acted 



?&i 



»*.-t 



which removed the flakes have been put in with very great 

 care. 



Description of the Specimens 



Fig. i. — Found in a gravel-pit in the occupation of Messrs. 

 A. Bolton & Co., Ltd., Henley Road, Ipswich. The gravel 

 occurs at a height of about 120 O.D., and forms one of the 

 plateau series of deposits. It is generally supposed to be 



