493 



"Eucalypts and Essential Oils," p. 188, and figured by J. E 

 Brown in his "Forest Flora of South Australia." 



5.— TABULATED RESULTS WITH THE CRUDE 

 OILS, TOGETHER WITH THEIR PRINCIPAL 



CONSTITUENTS. 



Table (a). — Species now Investigated. 



The full analysis of the oil of any particular Eucalypt 

 will be found described under that species. Constituents, 

 other than those enumerated, may be present in small amount 

 in many of the oils. Volatile aldehydes were present in small 

 quantities in all the oils, and free acid also, because the small 

 amount of water which always came over first on distillation 

 was acid to litmus. The saponification number includes that 

 for the free acid as well as for the esters ; it will be noticed 

 that the oil of two species had a somewhat high saponification 

 number. All the oils contain phenols in small amount. The 

 alcohol used in determining the solubilities w T as standardized 

 for percentage of absolute alcohol by weight. The refractive 

 indices were taken with a Zeiss Abbe refractometer and cor- 

 rected for 20° C, the factor 0*00047 being used for this pur- 

 pose. The yields of oil are from material collected as would 

 be done for commercial oil distillation. 



Table (b). — Species previously Investigated. 



The results recorded for the oils of species enumerated in 

 this table are those we had previously obtained from the same 

 species collected in other Australian States. From the numer- 

 ous investigations we have undertaken with authentic material 

 collected in localities far apart, it may be stated as a general 

 rule that an identical species of Eucalyptus, growing under 

 natural conditions, will furnish products chemically in agree- 

 ment. This fact is borne out in this research with both 

 E. acervtda and E. rostrata — in the former case from Kan- 

 garoo Island and Tasmania, localities hundreds of miles apart. 

 E. obliqua is also a good instance of this constancy, for we have 

 had material for investigation collected in the New England 

 district of New South Wales, and in several other localities 

 in this State, as well as in Tasmania, and the chemical results 

 are all in agreement. We have, therefore, no reason to sup- 

 pose that the species common to South Australia and the 

 Commonwealth will differ in their comparative chemical con- 

 stancy, and for that reason have given this table of results 

 for their crude oils for referential purposes. 



