2T8 



JOURNAL OF FORESTRY 

 VOLATILE OIL 



The oil obtained by steam distillation gave the following constants, 

 which were found to be unchanged after the oils had stood for a 

 y6ar in amber-colored bottles : 



Table 4. 



^ Westphal balance. 



The three samples of oil were mixed and subjected to distillation 

 over sodium using a 12-inch Hempel column filled with glass beads. 

 Several fractionations gave the results recorded below : 



Table 5. < 



l-a-Pinene — The constants obtained for fraction 2 indicate this por- 

 tion of the oil to be nearly pure a-pinene. The nitrosochloride was 

 prepared according to Wallach's method. ^^ A mixture of 50 gm. of 

 oil, 50 gm. of glacial acetic acid, and 50 gm. of ethyl nitrite was cooled 

 in a freezing mixture and 15 cc. of concentrated hydrochloric acid was 

 gradually added. The nitrosochloride readily crystallized out and was 

 filtered ofif and washed thoroughly with alcohol. When dissolved in 

 chloroform and recrystallized by the addition of methyl alcohol to the 



"Annalen, vol. 245 (1888), p. 251; vol. 253 (1889), p. 251. 



