54 



The latex contained 40.25% of solid material. 



The extracted gutta seems to be of very good quality, very tough 

 and of a Jight yellowish colour. It is very hard when cold and softens 

 readily on warming. 



The resin appears not to contain cinnamic acid esters, although 

 further work would be necessary to decide this point. 



It would seem as if the extracted gutta might be a very useful 

 substance. 



Leuconotis eugeniifoiius. 



The specimen examined was a low bush in the Botanical Gar- 

 dens, a mixture of Leuconotis, Willughbeia and Urceola. Great care 

 had to be taken to trace each stem to its proper leaf. The thickest 

 stems procurable were tapped transversely, and a small amount of 

 thin latex was obtained. 



Acetic acid coagulates this latex readily, but on analysis it was 

 found to contain no rubber. The main constituent, comprising 

 26.19% of the whole latex, is a sticky resin soluble in acetone. 



Artocarpus integrifolia. 



The specimens examined were common Jack trees. The latex 

 ran very well from herring-bone tappings. It was thin and very 

 sticky, neutral in reaction to litmus. 



Attempts to coagulate it were unsuccessful, but it was found the 

 agglutinated solid matter could be separated from the serum by 

 filtration on paper. 



A small percentage only was found to be insoluble in acetone, 

 and this was found to be a white powder, neither rubber nor gutta 

 percha. 



Analysis of the latex gave : 



Coagulum . . . ■ 26.79% • 



Serum solids Gums, pec- 

 tins, albumens, etc. . . 8.85% . . 

 Water 64.36% .. 



100. 



Solid insoluble in acetone . . 2.37% 



Resin soluble . . 24.42% 



8.85% 



64.36% 



100. 



The resin is a beautiful clear yellow, semi-solid mass, and is 

 extremely sticky. This and a powder of unknown nature are the 

 chief components of this latex, it containing no rubber whatever. 



Alstonia Pulai." 



The specimen examined was a large Alstonia angustiloba tree in 

 the Botanical Gardens. 



The tree was tapped by the herring-bone system, and the latex 

 ran well at first but speedily thickened in the cuts as does Dyera 

 latex. It was kept going gs well as possible by scraping it down the 



