HISTORY IN TOOLS PETRIE. 



569 



trade intercourse during all these periods. The only adoption 

 of such forms was due to entirely independent reinvention of 

 the ax with lugs in South America, without any intermediate 

 example. The form is a natural one to adopt in hammered copper, 

 for getting a firm attachment to the handle. 



20 to 36 —Forms of tools peculiar to Egypt. 



Other adaptations of the ax were tiie large blade of curved outline 

 on the end of a pole (fig. 24), the half-round halberd (fig. 25) and the 

 long edge set in a stout baton (fig. 26) for a cutting blow. All of 

 these were common in Egypt, but never spread elsewhere. 



