PARA RUBBER. 99 



Comparison op Yields obtained at Henaratgoda. 

 The following synopsis is given to bring the results at Henarat- 

 goda up to date ; the yields from all the systems employed are 

 included: — 



Method of Number Area Number of Total Yield 



tapping. of Trees tapped, times tapped. of Rubber. 



tapped. lb. oz. 



Full Spiral (A) .. 23 .. Base to 66" .. 37 .. 71 4.1 



,, (I)) .. 3 .. Base to 60" .. 168 .. 42 7? 



,, (E) .. 5 .. Base to 60" .. 83 .. 49 7J 



„ (F) ...",.. „ ,, .. 28 .. 12 9| 



„ (G) .. 5 .. „ „ .. 7 .. 15| 



„ (H) .. 3 .. ,, ,, .. 68 .. 13 14f 



,, (T) .. 5 .. ,, „ 62" .. 137 .. 38 12| 



„ (P) •• 1 30* .. 37 .. 7 13} 



Half-Spiral (B) .. 25 .. ,, ,,66" ... 60 .:. 46 13| 

 Full herring- 

 bone (C) . . 25 66" . . 57 . . 72 1£ 



„ (M) .. 2 .. 6 to If.' ... 45 .. 10 15£ 



,, (N) .. 2 .. 10 to 20' ..44 .. 14 lof 



„ (O) .. 2 .. 20 to 30' ..44 . . 9 12.i 



,, (L) .. I .. Base to 30' ..47 . . 9 6$ 

 ,, (W) . . 2 . . Base to 50' . . 37 . . 13 13j 

 The above results have been obtained from the 26th Sep- 

 tember, 1905, to April, 1906, from trees at Henaratgoda ranging 

 in age front 15 to 20 years. In all cases but little of the available 

 bark has been excised, the excised area measuring from \ to 2i 

 inches only in width, the original cuts being 12 inches apart. 



Rubber prom Shavings. 



According to Mr. G. H. Golledge it is estimated, in the Straits, 

 that the shavings from 100 coolies' work will give about 25 lb. of dry 

 rubber, but he is inclined to think that the parings to produce this 

 must be rather thicker than those produced on carefully worked 

 estates in Ceylon. Mr. Golledge's figures are not final, but expe- 

 rience shows that he can obtain from 100 lb. of shavings some 7 to 8 lb. 

 of j dry rubber by the use of a rubber washing machine, consisting 

 essentially of two rollers driven at different speeds under a stream 

 of water. 



Rubber Yield in The Straits. 

 The results obtained by Ridley, Stanley Arden, Derry, and 

 others have been published from time to time, and from them the 

 following synopsis is m;ule. The range in yield varies from 10 ounces 

 per tree for 6-year-old trees to 9 lb. per tree for older specimens; in one 

 case as much as 3 lb. of rubber has been reported from a well-grown 

 three-year-old tree. Some trees, having a circumference of 36 inches 

 have given 3 lb. of dry rubber per tree ; other trees, 24 inches or more 

 in circumference, have been known to give only 2} oz. of dry rubber 

 each, probably on account of their being too young. 



