BY R. ETHERIDGE, JUN. 



35 



chocolate-brown clay shale, the green quartzite, those of opaque 

 white jasperoid quartz, and the rock crystal heads are plain edged 

 and without serrations, and so also are three of the milky quartz, 

 but two of the latter and (hat formed of bottle glass are beauti- 

 fully and finely serrated. The whole of the faces are facetted by 

 percussion, even in the milky quartz and rock crystal spear-heads, 

 although the facets on the former of these are less apparent than 

 on the others. When we take into consideration the refractory 

 conchoidal fracture of quartz and glass, the chipping of these 

 spear-heads is a remarkable feat, more especially that of the milky 

 quartz heads with their serrations. This teething is not pointed, 

 or " dog-toothed," but each serration is in most instances square, 

 or at right angles, and corresponds exactly to the figure given by 

 Rear- Admiral King, and referred to in my previous account. 



The following table gives the measurements of the eleven spear- 

 heads obtained by Mr. JFroggatt, with their forms and mineralcgical 

 composition. 



