53 



the largest circumference of any one stem being about five inches. 

 The latex ran quite freely, without coagulating, from transverse cuts 

 on the thickest stems. 



The reaction was neutral to litmus. 



Coagulating agents did not act readily, and the whole was 

 evaporated. It then was a white brittle mass, very soft when hot. 



The latex contained 42% solid matter. 



Analysis Dry. 



Rubber 25.60% 

 Resin 74.40% 



100. 



The extracted rubber was a light coloured mass of little strength 

 or elasticity, although not tacky. It seemed to be rubber, but if 

 really such, is very poor. The resin is a pretty white substance crys- 

 tallizing well from organic solvents. 



Landolphia Heudelotii. (Africa.) 



The specimen examined was a bush in the Botanical Gardens, 

 growing in an inferior clay soil. Only a few feet in height with a 

 diameter of about two inches on some of the branches, the basal stem 

 being larger. 



The latex ran very slowly from transverse cuts and coagulated 

 rapidly. The rubber was obtained by picking the clots from the cuts, 

 and was handsome and strong. The analysis of the dry rubber is : 



Rubber 89.50% 

 Resin 10.50% 



100. 



rhe dry rubber is of a clear light brown colour, not tacky, and 

 very strong and elastic. Compared to Willughbeia rubber, it has a 

 better colour, and the resin content is less. It is, therefore, a better 

 rubber, as far as can be judged without vulcanization tests. 



Tabernaemontana dichotoma. (India.) 



The specimens examined in the Botanical Gardens were trees 

 about fifteen feet high, of a girth near the base of about eighteen 

 inches, and were growing in a very exposed place in poor soil. 



Two of these trees were tapped on successive mornings. The 

 latex ran slowly. It coagulated in a few hours in the bottle in spite 

 of added formalin. On rubbing between the fingers and thumb it 

 leaves them sticky as a good rubber latex should not do. 



The solid mass was extracted. The figures on the dry weight are ; 



Gutta 25.95% 

 Resin 74-05% 



100. 



