77 



quently been practically abandoned in the Malay Penin- 

 sula. The only case where this method is of value is 

 when it is intended to kill trees in a plantation by 

 tapping in order to thin them out. (See fig. 280). 



FIGURE 2?. 

 Sketch showing tapping systems. 



V cut. 



d. Full Herringbone. 



2. Half spiral. 



With this system the tapping- surface is divided into 

 two halves only one of which is tapped. Accordingly 



