( 15 ) 
One of the factories in the Peninsula is believed to 
be built on very much the same lines as the one 
at Tjipetir. 
It is probable that most of the future supplies of 
gutta percha will be prepared in such factories. 
V. — INFERIOR GUTTAS AND SUBSTITUTES. 
Several trees produce gutta percha which is 
relatively inferior because of the larger amount of 
resin contained. Several of the better known of 
these are briefly mentioned below: — 
1. Getah Sundik. 
Payena Leerii Kurz. 
This is a medium-sized tree of rather wide dis- 
tribution. It is found in the Malay Peninsula, 
Sumatra, Banca, Java, Amboina, Borneo, and the 
Philippine Islands, often near the sea coast. The 
'following notes are taken from Heyne, “ De Nuttige 
planten van Nederlandsch-Indie,” Vol. IV., 1917, 
p. 11. “ The getah is hard, becomes plastic in hot 
water and becomes hard again when cooled. The 
latex is thin and flows easily, so that it can be 
collected relatively free from impurities. It is 
naturally white, but changes colour and the product 
in trade is always more or less yellow. The getah 
is of fairly good quality, although it contains a 
large percentage of resin. It has the same resilience 
and also crackles when rubbed, like taban merah, 
with which it is sometimes mixed. It rarely appears 
on the market absolutely pure. It is sometimes 
mixed with dujan or puan (Palaquium Treubii 
Burck), hangkang (P. leiocarpum Burck), or djelu- 
