335 



Tabulated Results obtained with the Crude Oils, 

 at time of distillation, together with their 

 Chief Constituents. 



COMPLETE data in reference to the oils of individual species are not given here, 

 and fuller information concerning any particular oil will be found recorded under 

 that species, to which further reference may be made. Where more than one 

 result is given, the figures represent the highest and lowest and refer alone to our 

 own investigations. 



The differences shown with a particular oil are largely controlled by a 

 predominance of a certain constituent characteristic of the species, and the time 

 taken for the original distillation is also a contributing factor in varying the 

 amount of high-boiling constituents. In the list of principal constituents 

 recorded for each species, only the more pronounced are included, but others than 

 those listed often occur in small quantities, and as these are of a general character 

 they are not included in the list. 



The specific gravities were taken at room temperature and corrected for 

 15 C., the correction for each degree being 0-00075. The refractive indices are 

 the readings for a Zeiss Abbe refractometer with beatable prisms, and corrected 

 for 20 C., the correction used being 0-00047 f r each degree. The saponification 

 number with many of the oils is large ; this number is the sum of the esters and 

 free acid values, although the free acid with most species is very small indeed. 

 The solubilities in alcohol are, to a certain extent, an indication of the amount of 

 constituents containing oxygen, and the determination is one of considerable 

 value. The alcohol was standardised for absolute alcohol by weight, as a greater 

 uniformity in strength could thus be secured. The 70 per cent, alcohol had specific 

 gravity 0-872 and the 80 per cent. 0-8483, both at 15-5 C. If the oil was not 

 soluble in 10 volumes 80 per cent, alcohol, it is classed as insoluble. 



Volatile aldehydes occur in all crude Eucalyptus oils; where mentioned 

 they were more pronounced than usual. 



The phenols, tasmanol and australol, occur in all crude Eucalyptus oils, 

 and for that reason are not tabulated ; the amount present is usually very small. 



Eudesmol occurs in both the liquid and crystallised conditions ; where the 

 word eudesmol alone is given it means the crystalline form. 



Cineol is recorded in percentages for the original oils when first distilled, 

 and also in an adjoining column for the identical samples after these had been 

 stored away from the light and air for about 20 years. The analyses of the oils 

 at this later period are recorded under the species in this work. With several 

 of the oils increases in cineol were noticeable, and as the results in both cases 

 were obtained by the phosphoric acid method they are comparable. With the 

 majority of species, however, little or no alteration in cineol content had taken 



place. 



The letters placed with the figures in the cineol columns indicate that the 

 determinations were made by .(R) the resorcinol method; (T) qualitatively 

 determined, and (P) by the phosphoric acid method. In cases where letters are 

 omitted, the determinations were carried out with phosphoric acid. 



The yields of oil will be found recorded in a separate table. Articles 

 dealing with the chief constituents will also be found in this work, 



