54 
The latex contained 40.25% of solid material. 
The extracted gutta seems to be of very good quality, very tough 
and of a light yellowish colour. It is very hard when cold and softens 
readily on warming. 
The resin appears not to contain cinnamic sacid 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 eugeniifolius. 
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% •• 
Solid insoluble in acetone . . 2.37% 
Resin soluble 24.42% 
8.85% 
64.36% 
100 . 
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 “ Puiai, ” 
The specimen examined was a large Alstonia angustiioba 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 Dyer a 
latex It was kept going as well as possible by scraping it down the 
'U' 
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