95 



FIG. 35. 

 Sketch showing guide lines. 



Vertical 

 groove 



Side cut 



Guide lines 



i. POINTS WHICH SHOULD BE TAKEN INTO CONSIDERATION 



DURING TAPPING. 



i . The layer of bark which is to be shaved off should 



be as thin as possible. 



The importance of making 

 this shaving as thin as 

 possible has already been 

 pointed out; the thinner the 

 strip which is taken off, the 

 longer the tapper can make 

 a given tapping area last out. 

 A good method of keeping 

 this well in the mind of the 

 native workman is to draw 

 a guide line, one or two 

 inches below the first tapping- 

 line, (see fig. 35). He knows 

 then that he has to so 

 arrange his work that he 

 may reach that line within a 

 given number of days, and 

 he will do his best to ap- 

 proach the line as slowly as 

 possible. 



2. The cuts must be made 

 exactly parallel to the first 

 side cut. 



As we have already seen, 



the whole bark surface, within a given area, must be 

 worked off. If the direction of the tapping line is slightly 

 changed, by the time the greater part of the surface to 



