56 



An extraction showed that the rubber had entirely degenerated 

 to a very sticky gum. 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 thi« 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 ; in 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.S%% 



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 system, rather diagonally, and the latex seemed 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 B. K. 



