52 



The total yield from this tree at one tapping was 27 fluid ounces 

 of latex. It was thick, white, and of very agreeable odour. 



The coaguliim 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% 



Coagulum 36.29% . . ■! Resin 0.67% 



(Ash 0.07% 



c^r, c^MA ^^^o ! Organic Matter 2.30% 



Serum Sohds 2.63% ^^^^g 0^30/^ 



Water 6l.o8% Water 61.08% 



100. 100. 



The sohds 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. 



Willughbeia firma. 



I he 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% 



too. 



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. 



Chilocarpus 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, 



