RUBBER AND 



THI 

 AR 



RD 

 E A 



FOU 



AR 



RTH 

 EA 



of bark from the lower side of each V, in order 



to reopen the latex vessels 

 which become plugged with 

 coagulated rubber during the 

 intervals between successive 

 tappings. By this process the 

 whole of the outer bark be- 

 tween the V's is gradually 

 removed in the form of thin 

 shavings. When this has been 

 done the tapping of the first 

 area of bark is said to be 

 completed. In the majority 

 o f experiments tapping was 

 A R then continued by the similar 



A\R E/A treatment of the corresponding 



area of bark on the opposite 

 side of the tree, and when this 

 _________ _ __ in turn was finished a similar 



Fig. 12. Shows the tapped area was tapped immediately 

 above the first area. Similar 

 tapping of a fourth area im- 

 mediately above the second 

 area completed the treatment of as much bark as could 

 conveniently be reached from the level of the ground. 

 In the more prolonged experiments tapping was then 

 continued on the renewed bark of the first area 1 . 



1 During the first three years tapping in the main experiment with 

 70 trees, the spur pricker was used in combination with paring. This 



SEC 



OND 



areas as they would appear on 

 the bark if removed from the 

 tree and spread out flat. 



