RESULTS OF EXAMINATIONS. 

 EXAMINATION OF THE OLEORESIN. 



19 



The crude oleoresin which was examined had a characteristic 

 orangelike odor, and white crystals of resin acid had separated out. 

 The specific gravity of the original material was 1.0265; an 8.45 per 

 cent alcoholic solution gave for the optical rotation, a D2 o= -1.26. 

 The volatile oil was removed by distillation with steam, and the 

 average of two analyses was as follows: 



Per cent. 



Volatile oil 11. 4 



Rosin (grade M or fourth grade) '. 83. 5 



Chips, needles, etc - 



Water (by difference) 1. 8 



Total 100. 



EXAMINATION OF THE VOLATILE OIL. 



PHYSICAL PROPERTIES. 



The crude oil had a pleasant orangelike odor; specific gravity, 

 0.6971 ; and index of refraction, 1.3903. On fractional distillation of 

 500 grams of the oil the results given in Table 3 were obtained: 



TABLE 3. Fractional distillation of the volatile oil from Pinus sabiniana. 



IDENTIFICATION OF THE CONSTITUKN {8. 



Heptane. It is seen from the data on physical properties given in 

 Table 3 and figure 4 that the crude oil consists of nearly pure heptane, 

 since a single fractionation yields about 90 per cent of an oil with 

 an average boiling point of 98.5; specific gravity, 0.6881; and index 

 of refraction, 1.3898; the boiling point has been corrected for baro- 

 metric pressure using the factor 0.045 as determined from the work 

 of Young ( 16 ) on the vapor pressures of heptane from Pinus sabiniana. 



