556 



Treated with aniline the C 10 H 16 substance obtained was 

 11% and the following was the result of the analysis : 



The C 10 H 16 substance obtained oM resin 



1.8% ash 

 Melting point 145 



Treated with alcohol and ether we obtained of the 

 C 10 H 16 substance by— 



— I Analysis 15% 



— II „ 12.23% 



The substance had of ash 0.28% analysis I 

 Melting point 140° 



The total result of analysis I was 



Moisture 29.23% 

 Resinous substance 54.12% 

 C 10 H 16 substance 15% 



A further examination of the rubber-like substance was 

 impossible on account of the small quantity at our disposal. 



The coagulation of the milk in this way seems to us to be 

 a great improvement which will be of benefit for the selling 

 price of Jelutong as the better keeping quality of the material 

 will be favourably influenced by it, and besides, a saving in 

 freight and packing will be possible." 



(Sd). Harburg Vienna Rubber Works. 



Owing to the small sample submitted for analysis, it was 

 not possible to say the percentage of rubber in the 15% 

 hydrocarbon substance,otherwise the analysis, is exceptionally 

 favourable for so low a grade rubber and also as compared with 

 other analysis of commercial Jelutong. Jelutong rubber as 

 received in America is stated to contain 50% of moisture, and 

 Weber in his " Chemistry of India-Rubber " places the resin 

 as high, 85-95%. The purity, too, of our Purub prepared 

 Jelutong should be of some value — as the difficulty of 

 deresination is now better understood, and in America 

 Jelutong resin is used for chewing-gum and in the manufac- 

 ture of varnishes. 



R. DERRY. 



