76 



i . Full spiral cut. 



In this case, a continuous cut is made, sloping gently 

 downwards as it goes round the tree. The bark is 



FIGURE 28. 

 Sketch showing tapping systems. 



z. Whole Spiral. 



accordingly cut open over the whole surface and the 

 incision girdles the tree. The consequence is, that the 

 production of latex ceases sooner or later, and the tree 

 becomes stripped. The full spiral system has conse- 



