THE ESSENTIAL OIL OF LEPTOSPERMUM FLAVESCENS. 



177 



Boiling Point Percentage. 



Specific 



gravity at 



15° C. 



Optical 

 rotation, 

 degrees. 



Refractive 



index at 



20° C. 



99- 105° C. atlOnim.l 3 

 105-118 „ 5 



0-9174 

 0-9172 



+ 3-00 

 + 0-61 



1-4810 



1-4888 



Although they appeared to be mixtures containing ter- 

 pineol and geraniol in quantity, the presence of these 

 alcohols could not be confirmed. No combination with 

 phthalic anhydride or phenylisocyanate nor hydration with 

 5% solution sulphuric acid could be effected after repeated 

 trials. 



Determination of the Sesquiterpenes. — These were 

 worked up from the various fractions of boiling point 123 - 

 140° C. at 10 mm. They were allowed to stand over 

 metallic sodium for a week, and then repeatedly fractioned 

 over the same metal at 10 mm. In this way, two distinct 

 fractions were separated, consisting of pale yellow tinted 

 mobile oils of pleasant odour, somewhat resembling cedar 

 wood. The one of higher boiling point constituted the 

 main bulk, the lower boiling one existing in but small 

 amount in most of the samples. 



Oil. 



Boiling Point 

 °C.at 

 10 mm. 



Specific 



gravity at 



15° C 



Optical 

 rotation, 

 Degrees. 



Eefractive 

 index, 

 20° C. 



Hill Top, 9/11/20 ... 



129- 132 



0-9275 



+ 17-52 



1-5049 



Lane Cove, 19/11/20... 



129 - 132 



09253 



+ 4-82 



1-5046 



Hill Top, 26/2/2 L 



129-132 



0-9273 



+ 22-52 



1-5046 



Kuring-gai, 5/4/21 ... 



123-126 



0-9116 



inactive 



1-4966 



ditto 



129-132 



0-9171 



+ 13-75 



1-5040 



(Equal volumes of the respective sesquiterpenes were 

 separated from the last named sample). 



Much smaller fractions boiling at 123 — 126° O. at 10 mm. 

 were obtained from the other lots of oils, but seeing the 

 larger amount prepared from the Kuring-gai sample in a 

 fair condition of purity, there is but little doubt that 



L— October 5, 1921. 



