istic or aromatic and somewhat camphoraceous odor, 

 and a pungent, spicy, and cooling taste. Specific 

 gravity, 0.905 to 0.925 at 25 C. Soluble in all pro- 

 portions in alcohol; also soluble in three volumes of 

 70 per cent alcohol. Its alcoholic solution should be 

 neutral to litmus. It is dextrogyrate, the angle of 

 rotation being not more than +10 in a 100 mm. tube 

 at a temperature of 25 C. If 2 cc. of the oil be mixed 

 with 4 cc. of glacial acetic acid and 3 cc. of a saturated 

 solution of sodium nitrite be gradually added, the mix- 

 ture when gently stirred should not form crystals of 

 phellandrene nitrite. It should become semi-solid 

 on being stirred, when cold, with a third or a half of its 

 volume of phosphoric acid of commerce of specific 

 gravity 1.750 (presence of a due proportion of cineol)." 

 The Australian oil fulfils these specifications but the 

 Californian oil does not, and therefore the latter has 

 not been utilized to any great extent. It is this fact 

 that has led us to an examination of the Californian 

 oil, to determine whether there is any difference in 

 the crude oil from the same species of Eucalyptus 

 grown in Australia and California, or whether the 

 difference is simply in the method of refining. 



Baker and Smith 1 after a very extensive research 

 on the Eucalyptus oils of Australia state that "the 

 constituents of the oil of Eucalyptus globulus are 

 practically constant wherever the tree is grown; a 

 sample of oil distilled from trees in New South Wales 

 differed in no respect from the product of trees grown 

 in Tasmania or Victoria. The amounts of the con- 

 stituents may vary but the constituents found are 

 always the same." Our work on the Californian oil 

 has fully corroborated this statement, since we have 

 found exactly the same constituents in the Californian 

 oil that Baker and Smith found in the Australian oils. 

 The amounts of the constituents vary so greatly, how- 

 ever, as to give the crude oils entirely different proper- 

 ties. This may "be seen from the following comparison 

 of the Australian oil and Californian oil. 



CALIFORNIAN OIL AUSTRALIAN l OIL 

 D20 .................... 0.9052 0.913 



[a] .................... 1442 92 



1.46053 



Insoluble in Soluble in 1.5 volumes 



70 per cent alcohol of 70 per cent alcohol 



Free acid ................ 0.73 1.1 



Saponification No ........ 2.5 1.0 



Acetylation No .......... 56.0 ? 



1 "A Research on Eucalyptus with Particular Reference to Their 

 Essential Oils," by Baker and Smith. Published by the Australian Govern- 

 ment. 



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