24 A RESEARCH ON THE EUCALYPTS OF TASMANIA 



\olumes 70 per cent, alcohol. The saponification number 

 of the ester and free acid = 15'3, while in the cold with 

 two hours' contact it was 11 '7. 



On rectification, the usual amount of acid water and 

 volatile aldehydes were obtained below 166 C. (corr.), at 

 which temperature the oil commenced to distil. Between 

 166-1730 44 per cent, distilled; between 173-195 45 per 

 cent. ; the temperature then quickly rose to 225, and 

 between this and 252 5 per cent, distilled. These frac- 

 tions gave the following results: 



Sp. gr. at Rcf Ind-x 



Rotation a D> YfiPC, at24C. 



First traction -(-141 ... 0-9022 ... 1-4585 



Second traction... 4- 6'6 ... 0-9141) ... 1-4593 

 Third traction.... ... 0-931.9 ... 1-4*11 



The eucalyptol was determined in the portion distilling 

 below 195 by the resorcinol method, and 60 per cent, of 

 that constituent was thus shown to be present in the crude 

 oil. 



The rectified oil was practically colourless, and both 

 odour and taste were satisfactory. The results obtained 

 with this oil, and also with those of A'. ///-///V//-/v/ and A'. 

 nrnirnxfi, show them all to belong to the best class of 

 eucalyptol-pinene oils, but they suffer from the defect of 

 containing rather too much pinene, consequently their 

 specific gravities are reduced below 0*91. which figure is 

 demanded by the Pharmacopoeia for Eucalyptus oils. 

 However, considerably more than half of the rectified oils 

 of these species would consist of eucalyptol, and the sup- 

 posed defect of specific gravity could easily be remedied 

 if desired. 



Tt is interesting to notice how closely the oil of this 

 species agrees with that of K. vern'n-nMt. as may be seen 

 from the following table. The difference in yield is due to 

 the coarser stems and less expansive leaves of A'. 

 vernicosa : 



h. Mnelli'ri. A', i-rrnicoga. 



Eucalyptol-pinene oil, no phel.andrene. 



Yield p<T cent... 1-28 0-807 



Specific gravity 



at 15 C 0-9097 0*9038 



Rotation a p ... +10-4 +11-3 



Refractive index At 24 C.= 1 4629 At 18 = 1-4651 



S.N. esters, &c. 15-3 5-9 



First fraction.... Below 173 C.= +14-1 Below 173 = + 16 '7 



Second fraction . Below 195 C.= -f 6 6 Below 194 = + 9 4 



Eucalyptol 60 per cent. 59 per cent. 



