23,6 Perkins and Cruz: Oils in Chaulmoogra Group 561 



present or the purity of the sample in hydnocarpic or chaul- 

 moogric acid. 



The fractional crystallization was not sufficiently thorough to 

 demonstrate liquid acids, except in the case of Pangium edule. 

 Hydnocarpic acid is found in column a, Tables 4 and 5. 

 Hydnocarpus alcalae is unique in giving chaulmoogric acid in 

 these fractions, as is shown by the constancy of boiling point of 

 the esters and the high freezing point in Table 6. Panghmi 

 edule gives no hydnocarpic acid, as is shown by the lack of 

 optical rotation. The remaining oils all yield hydnocarpic acid. 

 Taking into consideration the weights and freezing points of 

 both a and b fractions it is evident that Hydnocarpus anthel- 

 minthica and H. subfalcata show a better separation of hydno- 

 carpic acid than the other extracted oils. Not much difference 

 can be noted between Hydnocarpus wightiana and Taraktogenos 

 kurzii, but Hydnocarpus hutchinsonii appears somewhat infe- 

 rior as a source of hydnocarpic acid. The pressed oils on the 

 whole give indications of better yields than the extracted oils. 

 Chaulmoogric acid occurs in Hydnocarpus alcalae in very large 

 proportion, as has been mentioned. The other oils show much 

 less chaulmoogric without much variation among themselves. 



Iodine number. — The Hanus method, one hour absorption, was 

 used. 



In the hydnocarpic acid fractions, Tables 4 and 5, both a and 

 b, the iodine number is in general lower than the theoretical 

 for hydnocarpic acid (100.7). There is considerable variation 

 in different samples of the same oil, Hydnocarpus anthelmin- 

 thica being the only oil definitely lower than the rest. 



The chaulmoogric fractions, Tables 8 and 9, show a definite 

 tendency toward a higher iodine number in the b fraction. This 

 is quite variable in different specimens of the same oil, some- 

 times showing considerable amounts of acid more highly un- 

 saturated than chaulmoogric. 



In the case of Pangium edule it is evident that the solid acids 

 are chiefly palmitic and stearic, as they have low iodine numbers. 

 Specific rotatory power. — The hydnocarpic fractions, Tables 4 

 and 5, show noticeable uniformity in rotatory power. The b 

 fractions give somewhat lower figures than the a fractions, show- 

 ing the presence of an inactive acid. This is especially true of 

 Hydnocarpus anthelminthica, which evidently contains an ap- 

 preciable amount of palmitic or a similar acid. 



The chaulmoogric fractions, Tables 8 and 9, show higher rota- 

 tion than the hydnocarpic, although the reverse is true of the 



