226 THE CENTRAL AMERICAN RUBBER TREE 



No. of trees tapped. 



1 

 1 



1 



Days tapped. 



8 



9 



13 



Yield of dry- 

 rubber. 

 oz. 



H 



3 



Hi 



Composition of Castilloa Rubber. — Castilloa rubber is 

 somewhat variable iii composition, as the percentage of 

 resin fluctuates widely in different specimens. The 

 followmg analyses, made at the Imperial Institute, wiU 

 indicate the composition of specimens derived from 

 various countries and prepared by different methods : 



