Dr. Kane on the Composition of certain Essential Oils. 145 



C. Specimen sp. gr. = 0.8864 ; boils at from 365° to 370°. 

 Material = 0.3788 gramme gave 



100.0 



As it is quite evident that, the heavier this oil is, the more stearopten it 

 contains, and consequently, the less pure it is ; and as, by Dumas's analysis, 

 stearopten, if not completely identical, has at least the same composition with 

 common camphor, I am inclined to consider the high values for carbon in the oils 

 used in analyses A and C as owing in great part to its presence, and to assign 

 the analysis B as a closer approximation to the composition of the pure oil. 

 With this idea agrees Saussure's old result, who from an oil of the sp. gr. 0.877 

 obtained the composition 



Carbon = 75.50 -i 



Hydrogen = 11.07 



Oxygen = 13.07 



Nitrogen = 0.36 



The nitrogen being now acknowledged to result from imperfections in the 



method employed, the tendency of which was also generally to give an undei*- 



estimate for the amount of hydrogen, his result is found to agree with that of 



analysis B ; but whether from both oils being pure, or from both being equally 



impure, I cannot undertake to say. 



Under such circumstances it is scarcely useful to attempt the construction of 

 a formula, as representing the result obtained. c,j ^^^ o.^ = 3 C5 H4 + 2 ho, may, 

 however, be employed : 



Thus, c,5 = 92.1 75.5 



H„ = 14.0 11.5 



o, = 16.0 13.0 



122.1 100.0 



X 2 



