224 THEJ central A^MERICAN RUBBER TREE 



of fifteen days. The average yield of dry rubber per 

 tree was 3 oz. from the first tappmg, and f oz. from the 

 second. 



(4) The oldest Castilloa tree in Trinidad, estimated to be 

 thirty years old, was tapped to a height of 40 ft. by 

 Smith's system. Two tappings were made at an interval 

 of one month and yielded 4 lb. 15 oz. of dry rubber, as 

 shown in the following statement : 



Yield of 

 latex. 



Yield of dry 

 rubber. 



Percentage of 



dry rubber in 



latex. 



First tapping, Feb. 8,1911 . 

 Second tapping, March 9, 1911 



2,400 

 1,170 



lb. 



3 



1 



3 

 12 



Per cent. 

 25-7 

 27-0 



(5) A tree 57^ in. in girth and about fourteen years old 

 was tapped by the double-herringbone system and yielded 

 9| oz. of dry rubber from the first tapping. 



Jamaica. — The following results of tapping experiments 

 made on Castilloa trees in Jamaica have been published 

 by the Department of Agricultm-e m the Island : 



(1) Twenty-one trees from eight to foiurteen years old 

 and with an average girth of 39 in. were tapped three 

 times in nine months ; the yield of rubber was as 

 follows : 



1st tapping, May 1910 

 2nd „ Sept. 1910 

 3rd „ Jan. 1911 



Total 



The trees, therefore, yielded an average of 12" 8 oz. 

 of rubber in the nme months. 



(2) Twenty-two trees, fourteen years old and with an 

 average girth of 35 in., were tapped twice and furnished 

 8 lb. 12 oz. of rubber, equivalent to 64 oz. per tree. 



(3) Two trees {Castilloa guatonalensis), about twenty- 

 two years old and 48 in. in gii'th, were tapped five times 

 with the following results : 



