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 axe nol given here, 

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

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

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

 own investigations. 



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

 predominance ol a certain constituent characteristic of the species, and the tune 

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

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

 recorded foi cm h species, only the more pronounced are included, hut others than 

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

 tln\ 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 Ahhe refractometer with heatable 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 o-N;.: and the So per cent. 0-8483, both at 15-5° C. If the oil was nol 

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



Volatile aldehydes occur in all crude Eucalyptus oils; when- mentioned 

 they wire 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 ii 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 lighl 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 

 ol 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 oi species, howevi r, little or no alteration in cineol content had taken 

 place. 



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

 determinations were made by K the resorcinol method; I qualitatively 

 determined, .mil I' by the phosphoric acid method. In cases where letters are 

 omitted, the determinations were carried out with phosphoric acid. 



1 1 1« • yields oi oil will he found recorded in a separate table. Articles 

 dealing with the 1 hiei constituents will also be found in this work. 



