The List "! constituents so fai determined in Eucalyptus oils is as follow : — 



i in ol • i I m ah ptol) < Ixide. 



i hi <1 



rerpineol 

 •Piperitol 



Globuol... 



Pinocarveol 

 •Eudesmol 

 ♦Methyl Alcohol 



Ethyl alcohol .. 

 •Butyl alcohol ... 

 *Iso-butyl alcohol 



[so .nu\ ] al( ohol 



Cuminal 

 ♦Aromadendral... 



♦Cryptal 



♦PheUandral ? ... 



< itral 



< itronellal 

 Butaldehyde ... 

 Valeraldehyde... 



*Benzaldehyde ? 



A!. 



>■ Aldehydes. 



"Piperitone 



Ketone. 



* I ismanol 

 ■ alol 



A' i tii 



I I I llll 



:::} 

 :::} 





ii ids, 



•Geranyl aceti 



•Butyl-butyi 



*Amyl-eudesri 



* Vmyl-phem La -Esters 



♦Valeric acid ester 



Terpinj I at etati 



Terpinyl-butyrate ... J 



Pinene ... 

 Phellandrene ... 

 Limonene 

 Dipentene 

 *Terpinene 



*Aromadendrene 



Cymene... 



► Terpem 



Sesquiterpene. 

 Alky] benzene. 



♦Paraffin... ... ... Solid hydrocarbon. 



(Deposit which forms in Eucalyptus Oils 



' Constituents marked with an asterisk are tin' outcome of these investigations. 



Cincol (or Eucalyptol). 



I his constituent of Eucalyptus oils 1ms the formula C IO H l8 0; specific gravity at 

 15 C. = 0-930; refractive index at 20 C. = 1-4584; boiling point 176 C. ; is 

 optically inactive ; crystallises at a low temperature, and melts at -- i° C. The 

 oxygen atom is combined as oxide, and for this reason cineol does not react 

 with either hydroxylamine or phenylhydrazine, nor does sodium act upon it in 

 the ordinarj way. Aldehydic, ketonic and alcoholic groupings are thus absent. 

 Th I!. inn- cineol was invcn to tin-- oil constituent by Wallach and Brass 



Ann. J25 (1884), 291] , who Inst isolated it in a purr condition from the oil of the 

 " Levant Wormseed," and characterised it as a definite chemical substance. 



ways. 



QUALITATIVE METHODS FOR DETECTION. 

 The presence ol cineol in Eucalyptus oils may b< determined in several 



(rt) It the interior of a short test tube i> moistened with the oil to be 

 tested ami the vapour of bromine passed into it, a crystalline 

 addition product will be formed on the side ol the tube, the 

 crystals being very pronounced it the cineol i> present in quantity, 

 but indistinct it the reverse. A smear ol the oil on a watch glass 

 will answer jusl as well, and with practice, as little as 10 pei cent. 

 of cineol in Eucalyptus oils can be detected in this way. 



