yet been satisfactorily explained. The only data we have to base 

 any theory on are, that Brazilian Para rubber comes from trees 

 of much greater age than those which give the plantation product 

 rubber We have however trees over 30 years old in the East and 

 the rubber from these does not show very markedly that it has the 

 brazihan properties of elasticity and resilience. 



Plantation rubber to describe methods briefly is coagulated soon 

 after leaving the tree and then pressed by rolling or simple pressure 

 until a large proportion of the water is expelled the partially dry 

 rubber is then dried by hanging in hot dry air and is not packed in 

 or shipment until contains a very small proportion generall) less 

 man 2/ G ot water. On manv Estates the rubber is during the 

 rolling process submitted to a constant stream of water which has 

 the effect of washing out the resins and proteids. 



The Brazilian method is to coagulate in thin layers bv means 

 of smoke which contains acetic Acid which induces coagulation 

 t"X- creosote > whlch prevents the growth of organisms causing 

 tackmess and putrefaction. No steps are taken to eliminate the 

 of moistSre ^ ° f COa ^ ulated films contain 1 5 to 20 per cent. 



or JrwT th ° d ° f C ? a S ulati ng by thin films impregnated by smoke 

 produces a mass which has in itself an automatic pressure Each 



tnoueht'k is aC d ! ffl g V* 33 a Ver >' thin t{ % ht rubher banda § e and 

 The Brazilian differs in i 



number of pounds per sqi 



ulated in thin films without 

 ^^^^X^^ 6 ^ -eans of creosote in the 



^oT^^^nTT" r/; addedas sat " ily 

 ^cZui^T 7 i r rporated when mixed with the latex 



of coagulation ' ^ when a PP lied during or after the process 

 byThe 6 U^LV^^^ exception of the block shown 

 Mr. C. O UACA^Zf^Vf S ° me Similar blocks exhibited h l 

 nothing new Z h Culloden Estate, Kalutara, Cevlon, included 

 qualitv were shown t eet ' Cre P e ' and Scra P> all of very fine 

 The size of the Fvfc;K;,° m Ceylon and Federated Malay States, 

 not limited them selves t T by P lanters fro ™ the latter "who had 

 amount admissible aav^ \u 5 lbs \ whlch , was given as the smallest 

 was shown a mo e'imoosinl where the Mala y an rub ^ 



^meoftheCeyl^ ra t 8 ^™°«.t h a»the meagre show of 

 small amount of sheet n In wh ' ch 0nl y a verv few biscuits or a 

 The m ° repe WaS Sent 



6 m ° St lnterestin g result of the judging from a Ceylon and 



