POPULAR SCIENCE 439 



it is seen that the flakes removed from their edges are not squat, 

 nor have they cut deeply into the flint, giving rise to a step or 

 ledge at the point of their final separation from the parent 

 block. And in these particulars they agree with the specimens 

 illustrated in figs. 8 and 9, which were flaked by the author. 

 The edge-flaking of the Lowestoft beach specimen, however, 

 exhibits both the characteristics mentioned, and approximates 

 very closely to the edge-flaking produced upon the flints in 

 the sack experiment. The fractures forming the flaked edges 

 of the specimens illustrated in figs. 1-6 also do not exhibit 

 numerous prominent ripple-marks upon their surfaces, such 

 as are so frequently produced by fortuitous blows, while the 

 Lowestoft beach specimen (fig. 7) shows well-developed ripple- 

 marks upon five out of its seven flake-areas. In the case of 

 the two specimens flaked by the author, prominent ripple-marks 

 upon the flake-areas are very infrequent. It will probably be 

 remembered that in the sack experiment to which reference 

 has been made, it was noticed that the edges of the flaked 

 stones tended to assume a sinuous outline due to blows having 

 fallen upon either side of these edges. 



In the specimens illustrated in figs. 1-6, the blows which 

 have produced the edge-flaking have all been delivered from 

 one side of the flint only, and in consequence no sinuosity of 

 the edge is observable. This is also the case with the specimens 

 flaked by the author (figs. 8 and 9). 



The Lowestoft specimen (fig. 7) shows a distinct tendency 

 to assume a sinuous outline in its flaked edge, due to blows 

 having removed flakes from both sides of that edge. 



The specimens illustrated in figs. 1-6 do not exhibit an 

 undue number of truncated flakes removed from their flaked 

 edges, 1 and in the case of the Lowestoft beach specimen 

 (fig. 7) there do not appear to be many developed, though 

 the edge is so battered as to make a certain diagnosis impos- 

 sible. The specimens flaked by the author (figs. 8 and 9) 

 do not show an undue number of truncated flakes removed 

 from their flaked edges. 



The foregoing examination has shown that the primitive 

 edge-flaked flints illustrated in figs. 1-6 exhibit the following 



1 The number of truncated flakes removed from the edge of a flint was shown 

 to indicate whether the specimen had been flaked by man or by nature. See 

 Science Progress, July 1916, pp. 46-7. 



