[boswell] 



THE CONSTITUTION OF RUBBER 



39 



instead of petroleum ether. This was the more necessary as Harries 

 (23) and also van Rossem (24) studied the action of potassium per- 

 manganate on rubber and were unable to isolate any oxidation pro- 

 duct related to rubber. Following are the results of analyses: 



Analyses (2). Using Benzol. 



Collecting the analyses and comparing with the calculated values 

 for C25H40O. 



C H 



There seems to be no doubt that an oxygen compound of the 

 composition C25H40O has been prepared. 



This compound readily takes up oxygen on warming slightly in 

 the air or even on standing in the air for a short time at room tempera- 

 ture. Upon analysis of two different preparations the following 

 results were obtained : 



