243 
KOALATEX IN RUBBER COAGULATION. 
Hamburg, Hoppensack , 8. 
There exist several methods for the transformation of proto- 
rubber, which finds itself in each rubber milk, into rubber. Even the 
best rubber milks do not give good rubbers, if a bad method of 
preparation or a non-practicable coagulator has been used. All 
rubber milks contain a bigger or small proportion of foreign sub- 
stances, which, partly, may be easily removed. The most trouble 
is caused by the albuminoid matters which accompany the proto- 
rubber and, if not carefully removed, cause fermentation, overheating 
and a bad smell of the rubber. In fact it is very difficult to remove 
quantitatively the albuminoid matters even from Hevea rubber milk. 
Therefore it is necessary to use as coagulators only such chemicals 
as have a high disinfecting and preserving action. Liquid acids as 
sulphuric, hydrochloric and acetic acid are not practicable for use 
of plantations which mostly do not have good communications, and 
the transportation of these liquid acids is very dangerous and costly. 
Besides, these acids have nearly not at all any disinfecting or pre- 
serving value, and they do not prevent the becoming black of some 
kinds of rubber, especially after drying. There exists some organic 
acids which have not only a good coagulating action, but also have 
the superiority of being efficacious disinfectors and preservators, but 
their prices are extremely high. Owing to the far-seeing examina- 
tions and experiments of a highly prominent crude rubber expert 
the rubber coagulation problem had been solved by the compound 
“Koalatex,” which is a good acting coagulator, gives light coloured 
rubbers, which remain light after being dried. Koalatex prevents 
must, is easily transportable and safe, and has a low price, $19.50 
per 100 lbs. or £4.10.0 per cwt. f.o b. Hamburg, package included, 
in tins and cases. 
LEHMANN and VOSS, 
Manufacturing Chemists. 
PARA RUBBER IN SAMOA. 
In the Consular Report for Samoa for 1905 is the following 
account of rubber planting in Samoa. Mr. T. ANDREW, a planter, 
reports — " In 1904 I supplied your yearly report with a few remarks 
on the cultivation of Hevea braziliensis in Samoa. Since then the 
trees have grown rapidly, not so much in height as in girth, they 
are just six years old from the seed, measuring 25 consecutive trees 
at three feet from the ground, the largest tree measured 24^ inches 
in circumference; the average of the whole was i r j\ inches. The 
measurements are by no means insignificant when compared with 
those made at the experimental gardens of the different districts 
within the zone of rubber culture. The trees in question are planted 
