TWO PINNATE LEAF BORONIAS AND THEIR ESSENTIAL OILS. 



199 



variation in the percentage yield of oil from the two collec- 

 tions is due partly to different methods of steam distillation, 

 size of still, etc.) 

 The crude oils possessed the following characters, viz: — 



28/8/20 



2/9/21 



0-8784 



0-8917 



-4-7° 



- 15*25° 



1-4825 



1*4762 



Specific gravity, 15° C. 

 Optical rotation 

 Refractive index 20° O. 

 Solubility in 80% alcohol 



(by weight) insol. 10 vols. [soluble 1 vol. 



Fluorescence not detected most pronounced 



Sample 28/8/20, on distillation, gave about an 80% frac- 

 tion boiling at 172 - 180° C, with the following characters, 

 viz : — 



Specific gravity, 20° 0*8510 



Refractive index, 20° 1*4752 



Optical rotation ... ... ... ... - 12° 



It did not yield a nitrosochloride or tetrabromide deriva- 

 tive when tested for by the usual methods applicable to 

 limonene. 



Sample 2/9/21, 40 ccs* crude oil, ester No. 5*38, were 

 distilled at 10 mm. 



It commenced to distil at 61° C, and gave the following 

 fractions : — 



Boiling Point, 



Quantity. 



Specific 



gravity at 



19° C. 



Optical 

 Rotation, 

 Degrees. 



Kefractive 

 iudex, 20° C. 



61- 76° Cat 10 mm. 

 76-100 ditto 

 100-116 ditto 



14 ccs. 



19 „ 



4 „ 



0'8580 

 0*8889 

 0*9272 



-21*4 



-13-75 



-11*95 



1-4723 

 1*4759 



1*4802 



Neither a nitrosochloride or bromide could be prepared 

 from any of the fractions. On oxidation with alkaline 

 potassium permanganate solution a solid acid of melting 

 point 100° C. was separated from a very sparingly soluble 



