100 PARA RUBBER. 



The following re suits" are of considerable interest, as they show 

 the yield obtained by tapping trees of different ages on 12 alternate 

 days by the herring-bone system : — 



No. Circumference 3 ft. Age. Yield, 



from ground . Years. Ounces. 



1 



2 



3 



4 



5 



From these and other results Arden concluded that trees under 

 four years were too young to be tapped . and that an average annual 

 yield of 12 ounces per tree should be obtained from trees 6 years old. 

 Other results have shown that an average of 3 lb. of rubber per tree 

 per year, from trees in their 11th to 15th year, may be reasonably 

 expected. 



Two very old trees at Perak,t having a circumference of 56 to 89 

 inches respectively, and reported to be 25 years old, have given in two 

 months' tapping no less than 12 and 18 lb. of dry rubber, including 

 scrap. 



Other trees at Perak, 14 years old, have given an average yield 

 of over 4 lb. each, and others of the same age quoted by Johnson show 

 a yield of 3 lb. 1 oz. per tree in Malacca, and 6-year-old trees in 

 Selangor 1 lb. 2 oz. per tree. The figure on Plate 1. series B, shows 

 a tree being tapped on the herring-bone system in Malacca. 



The Sandycroft Rubber Co., in their annual report for 1905, 

 state that 4,050 Para rubber trees were tapped during the first por- 

 tion of the year, and these 4,050 trees were re-tapped 6 months later 

 together with 5,238 other trees : the dry rubber from these tappings 

 totalled 6,979 lb. sheet and 1,823 lb. scrap, or a total of 8,802 lb. 

 of rubber from 9,288 trees. 



In Java, according to Dr. Haas, there is a large variation in the 

 yield of trees of the same age or between equal areas of bark on the 

 same tree. 



Rubber Yields in India during 1906. 



There are very few records of the yield of rubber in South India, 

 but in a recent issue of the Madras Mail information was given re- 

 garding the growth and yield obtained on Hawthorne Estate, She- 

 varoy Hills. On this property the Para rubber is growing among 

 coffee, at an elevation of 3,000 to 3,500 feet, and in a climate having 

 only about 50 inches of rain annually. The photographs of the 

 rubber on this estate show fairly good growth, most of the trees 

 having been allowed to produce tall and slender stems. Early in 

 1906, 91 Para rubber trees, twelve of which were seven years old and 



* Report upon Hevea brasiliensis in the Malay Foninsula, Stanley 

 Arden. 



•f India Rubber Journal, February, 1903. 



