56 
An extraction showed that the rubber had entirely degenerated 
to a very sticky guin. In confirmation, a second extraction of a 
large quantity was made with the same result. The product is, 
therefore, absolutely worthless. 
MANIHOT GLAZIOVII. 
The specimen examined was taken from a large tree in the 
Botanical Gardens, Singapore, The bark was quite unlike that of 
most rubber plants, having, a very thin outer bark. This came away 
from the tree very readily when the knife was used and a large 
surface of the same was stripped back. On this exposed place, a 
herring-bone tap was made, retapped again on the following day, and 
again two days later. The latex tubes are very near the outer sur- 
face, of the inner bark, and these few successive tappings did not 
increase the flow of latex to any appreciable extent. 
Unlike Hevea brasiliensis, the latex coagulated quickly in the 
cut, so that the flow ceased almost immediately ; iii fact, it was 
quite impossible to collect it in cups for this reason. The rubber 
collected was obtained by stripping it from-the cuts. It had a very 
disagreeable herb-like odour. Analysis gave the following figures 
calculated to dry weight : 
Rubber 90.44% 
Resin 6.8}% 
Ash-' 2.73% ' - ; 
100 . 
The rubber is fine and tough, . tougher than Plantation. Para, and 
very light straw yellow in colour. The ash could, of course, be 
reduced to a negligible amount by washing. . 
CHONEOMORPHA MACROPHYLLA. 
The specimen examined was taken from a large vine in the 
Botanical Gardens, Singapore. The stems were about 3 % inches in 
diameter, and the base much thicker. It was tapped by a sort 
of herring bone sv stem, rather: diagonally, and the latex .seehied to be 
quite abundant. It coagulated in the cuts very readily, with about 
the same ease as Willughbeia firma. As part had coagulated, 
it seemed impossible to keep the latex in a liquid condition for the 
time necessary, and it was all coagulated by rubbing up with the 
fingers. The rubber was tough and almost odourless. 
The analysis, calculated to dry weight, is : 
Rubber 88 . 63 % 
Resin * 9 . 19 % 
Ash 2.18% 
100. 
I should say it is a better rubber than either Willughbeia firma 
or Landolphia heudelotii , although the raw rubber is not as tough as 
either of these two. It has slightly less resin, and a real comparison 
would require vulcanization tests, 
R l M 
