52 
The total yield from this tree at one tapping was 21 fluid, ounces 
of latex. It- was thick, white, and of very agreeable odour. 
The coagulurn obtained by use of acetic acid was analyzed and 
the amounts of several of the other constituents determined. The 
dry rubber has the following composition. 
Rubber 98.14% 
Resin 1.86% 
100. 
Albumens were not determined (as they should be for strictly 
accurate results.) Their amount is small compared to the total, and 
the usual acetone extraction gives figures that are near enough to the 
truth for all ordinary purposes. 
The analysis of the latex is : — 
Rubber 
35 . 55 % 
Coagulurn 
36.29% 
Resin 
0.6 7% 
Ash 
0.07% 
Serum Solids 
2.63% .. 
I Organic Matter 
(Ash, . 
2.30% 
0 . 33 % 
Water 
61.08% 
Water 
61.08% 
too. 100. 
The solids soluble in water, (tannins, colouring matters, pentoses, 
gums, sugars of the inosite group, etc.,) form a brown sweet smelling 
mass of extremely hygroscopic nature. 
The strength and appearance of the rubber were very fine. 
The percentage of 36% coagulable matter in the latex is very 
high for Para and is in accordance with the rule that the percentage 
of rubber in a latex increases as the tree gets older. 
Wiliughbeia firma. 
The specimen was a vine about twelve years old, in the Botanical 
Gardens, growing in the jungle part of the same. Greatest diameter 
of stems about,2% inches. The latex was found to flow most readily 
from transverse cuts, but coagulated so easily that collection as latex 
was difficult. Some of the latex was collected as such and added to 
the clots picked out of the cuts. The rubber was dried in the air and 
analyzed. The results are : 
Rubber 86.82% 
Resin 13.18% 
100. 
It was a very fine tough rubber, turning very dark coloured in a 
short time. Except for the high resin content it is a first class 
rubber. 
Ghilocarpus enervis. 
This latex was obtained from a creeper in the Botanical Gardens. 
It consisted of a mass of twisted stems around a large cinnamon tree, 
