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 kerosine, 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. 
K<\ 
