555 



Of all the chemicals tried Purub proved the only 

 satisfactory re-agent. Both sulphuric-acid and creosote 

 partially separated the hydrocarbon substance but in 

 both instances the resulting substance went mouldy, and 

 would undoubtedly have fermented in bulk in the same 

 way as native-prepared Jelutong, coagulated with 

 gypsum and ^erosine, and also alum. In this latter form 

 there is an excess of moisture as a consequence of 

 partial coagulation and the fermentable matter is not 

 separated and carried off in the remaining mother liquor. 



The following report and analysis has been received 

 on a sample of Jelutong rubber, coagulated with Purub 

 in the Economic Gardens from a continental firm who 

 are large consumers of this rubber :— 



Harburg Vienna India Rubber Works, 

 Harburg on Elbe. 



October 16, 1909. 



H. N. Ridley, Esq., 

 Dear Sir, 



" As desired we give you the results of our tests and 

 analysis as follows : 



The quality of the material sent us is much better in 

 comparison to the market goods. The balls are of a fine 

 white colour and had a general degree of moisture of only 

 about 30% and was therefore much better for rubber manufac- 

 turers than the ordinary market goods. The resin was of 

 greater purity and had a fine white colour, otherwise the same 

 properties as ordinary Jelutong. The chemical constituents 

 also (quantity of iodine, quantity of saponification, acid 

 quantity), etc., were the same. 



The quality of the material which, as the C 10 H 16 resulting 

 substance, so far as could be judged by the small quantity at 

 our disposal, was middling, good and only slightly better than 

 the product from the market goods. 



