28 
laterals should be dug out and burnt as old rubber butts have 
proved one of the most fruitful sources of Usttdina zonata and 
other fungus growths. 
My suggestions are based on the supposition that directors have 
in view an average yield of say 450 lbs. dry per acre. Possibly 
they may hope for 500 lbs., but it must be remembered that with, 
say, 50 trees per acre this would mean an average yield of 10 lbs. per 
tree. The highest yield which I have records of for a section of 
over 100 acres is 8.33 lbs. per tree for a section of 110 acres of 13 to 14- 
year old rubber This is still some way from the legend ascribed to 
a well-known planter of a single tree per acre connected with the 
factory by a pipe. 
