Occurrence of Jade in British Columbia. 369 



the piece to be detached was still united to the main mass. 

 The boulder from Yale (Fig. 1) shows the same process in 

 an earlier stage, though deep cuts have been made on both 

 sides of the stone, one of which is shown in the illustration. 

 Several of the adzes or chisels show that the same method 

 of sawing was adopted to trim off the edges of the flat 

 pieces first obtained, and to render them parallel sided. 

 Pieces thus cut from the edges of adzes are represented 

 among specimens from graves near Lytton. Figure 3 re- 

 presents a selvage piece of this kind, which has been sawn 

 through on two sides. Figure 4, presents front and side 

 views of a small adze from the same place, the edge still 

 showing the median rib between two opposite saw-cuts, 

 which has not been ground of. 



Having been thus roughly blocked out by sawing, the 

 surfaces of the adze were next generally ground flat. In 

 the more finely worked specimens, this subsequent grinding 

 has almost or altogether obliterated the original shaping 

 furrows, and the surfaces have eventually been well 

 polished. 



(All the figures one-fourth actual size.) 



