72 RUBBER AND 



It appears that on the average the yield per tapping 

 is lowest in April and May. This yield rises continuously 

 until December and then steadily falls off again. The 

 increase from April to December on the average of these 

 three years, and taking the average result from tapping 

 at a number of different intervals, does not fall far short 

 of fifty per cent. 



The seasonal variation in yield is clearly associated 

 to some extent with the climatic conditions at different 

 seasons, as may be seen on comparing it with the follow- 

 ing table which shows the average monthly rainfall at 

 Henaratgoda for the three years 1909 1911. 



TABLE XV 



Rainfall at Henaratgoda^ A verages 1 909 1911. 



It will be observed, on comparing Tables XIV and 

 XV, that the season of highest yield follows shortly after 

 the season of greatest rainfall. In countries subject to 

 a prolonged dry season the variations in yield are much 

 more marked. The following table shows the monthly 

 crops of dry rubber harvested during 1912 on a well- 

 known' property in South India. 



