ESSENTIAL OIL OF EUCALYPTUS SMITHII. 



167 





Specific 

 gravity 

 at 15° C. 



Rotation 



Refractive 

 index. 



Solubility 

 in 70% 

 alcohol. 



Saponifi- 

 cation 

 number. 



Cineol 

 per cent. 



(a) 



0-9098 



+ 



7-6° 



1-4636 



at 20° 



Required 

 1*6 vols. 



4-8 



67-4 



(b) 



0-9157 



+ 



6-5° 



1-4635 



at 20° 



1-2 „ 



5-6 



74-2 



M 



0-9116 



+ 



9-2° 



1-4650 

 at 19° 



2-1 „ 



1-3 



61-5 



(d) 



0-9139 



+ 



7-6° 



1-4634 



at 18° 



1-4 » 



4-1 



69-0 



(•) 



0-9198 



+ 



4-7° 



1-4672 

 at 16° 



1-2 „ 



2-7 



75-0 



(/) 



0-9156 



+ 



5-3° 



1-4571 

 at 26° 



1-1 ,, 



3-3 



80-7 



(9) 



0-9154 



+ 



5-1° 



1-4574 

 at 25° 



1-1 „ 



3-1 



79-0 



(h) 



0-9210 



+ 



4-2° 



1-4604 



at 22° 



1-1 „ 



1-3 



85-2 



The cineol was determined by the resorcinol method, in 

 all cases in the redistilled portion of the freshly obtained 

 oil boiling below 190°. The alcohol for solubilities was 70 

 per cent, by weight. 



It will be noticed from the above that the oil from the 

 younger seedlings contains more dextrorotatory pinene and 

 less cineol than that from saplings two to three years old, 

 and that the maximum cineol content is reached in the oil 

 from leaves collected from older trees. This is true also 

 for the leaves which are reproduced from lopped old trees, 

 and the oil from the seven months' "suckers" contains 

 more cineol and less pinene than that from twelve months' 

 old seedlings, while that from the fifteen months' old 

 "suckers" follows the same rule in respect to the two and 

 a half years' old seedlings. The constants follow this change 

 in constituents somewhat regularly. To a small extent 

 these are governed by the length of time to which the 

 leaves are distilled, as naturally the heavier constituents 

 are brought over with more difficulty. The factors which 

 are influenced to the greatest extent are the specific 



