RUBBER PLANTING 81 



foot above ground level. Continuous paring for nearly 

 six months produced the following yields of latex from 

 the different cuts. 



TABLE XX 

 Yields of latex at different distances from the ground. 



Height above ground Yield of latex, 



level, feet cubic centimetres 



6 16,607 



5 18,281 



4 18,773 



3 22,353 



2 25,998 



i 67,942 



The lowest cut of all gives a very much larger yield 

 than any of the others, owing to the fact that it drains a 

 larger area of bark, and one which is in free communica- 

 tion with the covering of the roots. The five upper cuts 

 are more nearly comparable with one another. These 

 show a steady slight increase in yield in passing down 

 the stem. The latex from the lower cuts also contained 

 a slightly higher percentage of rubber than that from 

 the upper cuts. 



Incidentally these figures afford further evidence in 

 support of the conclusion that the bulk of the latex 

 obtained is manufactured locally. If the latex passed 

 down in large quantities from the upper part of the 

 trunk and then flowed laterally into the tapping area, 

 we should expect a larger flow from the topmost cut 

 than from the cuts immediately below it. As a matter 

 of fact the reverse is the case. 



L. 6 



