16 



OLEOKESINS OF SOME WESTERN PINES. 



EXAMINATION OF THE VOLATILE OIL. 



PHYSICAL PROPERTIES. 



The oil had these properties: 1 Specific gravity, 0.8639 at 15; 

 index of refraction, 1.4727 at 15. 



The physical constants of the fractions obtained on distillation are 

 shown in Table 2. 



TABLE 2. Fractional distillation of the volatile oil of Pinus ponderosa scopulorum from 

 the Coconino National Forest, Ariz. 



The original oil, and especially the last fractions, had a pleasant 

 orange-like odor. 



IDENTIFICATION OF THE CONSTITUENTS. 



a-pinene. The first fractions of the oil, when tested for 

 tf-pinene, readily yielded a nitrosochloride when treated with 

 nitrosyl chloride; the purified nitrosochloride melted at 103. 



ft-pinene. The fractions boiling between 160 and 170 were 

 examined for /?-pinene by oxidation with potassium permanga- 

 nate in the manner previously described. A small amount of nopinic 

 acid (about 0.75 per cent) was obtained, which melted at 125; this 

 proved the presence of /?-pinene. 



Limonene. The fractions boiling above 170 were repeatedly 

 fractionated and two fractions were separated. These had the fol- 

 lowing properties: (1) Boiling point, 175 to 176; specific gravity, 

 0.8588; (2) boiling point, 176 to 177; specific gravity, 0.8580. 

 Fraction 1 was distilled over sodium, dissolved in ether and treated 

 with dry hydrogen chloride. A dihydrochloride was obtained, 

 which melted at 50. Fraction 2 was treated with bromine. The 



i Two oils obtained from separate areas and representing the collection for the season 1911 had the follow- 

 ing properties: (1) specific gravity, 0.8654 at 15; index of refraction, 1.4723 at 15; specific rotation, 

 [0)0= +13.03; (2) specific gravity, 0.8672 at 15; index of refraction, 1.4729 at 15; specific rotation, 

 [a] D =+12.86. 



