DISTILLATION OF STUMP WOOD. 



61 



of the apparatus devised in the Bureau of Chemistry and described 

 in detail in Bureau of Chemistry Bulletin 135, " Commercial Tur- 

 pentines." 



The distillation data, along with the other data thus obtained, 

 bring out a striking uniformity in the physical properties of cor- 

 responding samples from various sources, differing, however, from 

 the better quality of wood turpentine from the South Atlantic and 

 Gulf States in their higher, though equally narrow, boiling points. 



* 



* 



FIG. 5. Proportion of oil to water in distillate. 



The major portion of turpentine from western yellow pine dis- 

 tilling between iTO^and 175 C. instead of 160 and 165 C., as is the 

 case with gum turpentine obtained from southern yellow pine, in- 

 dicates that in place of alpha-pinene this turpentine from western 

 yellow pine is largely made up of beta-pinene (7). 



To obtain a closer separation of its constituents, and thereby gain 

 a better insight into the proportion and nature of the bodies prob- 

 ably entering into its composition, a composite sample of refined first- 

 grade turpentine, from first and second crude turpentine combined in 



