24 DISTILLATION OF RESINOUS WOOD BY SATURATED STEAM. 



dipentene than the oil distilled entirely at 70 pounds pressure (fig. 4) ; 

 in the latter case the specific gravity values are lower and the propor- 

 tion of the oil boiling between 165 and 180 is larger. Formerly it 



7 



90 



80 



70 



60 



50 



40 



30 



7 



10 



.92 .93 



155 160 165" 170' 175 180 ,86 .87 .88 .89 .90 .91 

 BOILING POINTS (CORRECTED) C SPECIFIC GRAVITY AT 15 C. 



FIG. 4. Boiling-point and specific-gravity curves for oil from run 23. 



was thought that the dipentene in wood turpentines was caused by 

 the temperature used in distilling the oil from the wood, but indica- 

 tions of dipentene were found in all the samples of oil obtained in this 



