petroleum ether, bromine was slowly added according 

 to the method of Wallach 1 for preparing thujone tri- 

 bromide; crystals were obtained which, after twice 

 recrystallization from ethyl acetate, melted at 123- 

 124. Thujone tribromide melts at 122. 



A small quantity of oily substance remained from 

 Fractions 8, 9 and 10 after the separation of the cam- 

 phor and thujone; this was a resinous oil, probably 

 partly formed by polymerization during the process of 

 distillation, and partly consisting of other high boiling 

 terpenes which occurred in quantities too small to be 

 definitely determined. 



A comparison of our analysis with that of the Bureau 

 of Plant Industry gives a good indication as to the 

 variation of the constituents of the oil with the season. 



At the earlier season at which we obtained our 

 material, the oil contains a considerably higher per- 

 centage of the lower boiling constituents, while at the 

 later period a somewhat greater percentage of camphor 

 was found. 



CHEMICAL LABORATORY 



UNIVERSITY OP CALIFORNIA 



BERKELEY 



i Ann., 275, 196; 286, 129. 



