176 



A. It. PENFOLD. 



re-distilled at 760 mm. aud found to consist almost entirely 

 of «■ and /3 pinene, the latter preponderating, viz.: — 



a Pinene. 



Sample. 



Hill Top, 9/11/20 

 Kuring-gai, 5/4/21 



Boiling Point. 



° C. 



156-158 

 158-160 



Specific 



gravity at 



15° C, 



0-8613 

 0-8648 



Optical 

 rotation, 

 Degiees-. 



+ 35-20 

 + 6-11 



Refractive 

 index, 20° C. 



1-4665 



1-4725 



The last named gave an excellent yield of nitrosochloride, 

 which on careful purification, melted and decomposed at 

 109° C. The former behaved similarly when mixed with 

 an equal volume of laevo-rotatory pinene from oil of Euca- 

 lyptus phlebophylla, [a] D 20° O. — 50*18°, both of which failed 

 to do so singly. 



ft Pinene. 



Sample. 



Boiling Point. 



C. 



Specific 



gravity at 



15° C. 



Optical 

 rotation, 

 Degrees. 



Refractive 

 index, 20°C. 



Longueville, 19/11/20 



160-163 



0-8600 



+ 16-55 



1-4713 



ditto 



163-166 



0-8645 



+ 15-25 



1-4732 



ditto 



166-169 



0-8630 



+ 13-51 



1-4752 



Kuring-gai, 5/4/21 



162-166 



0-8658 



+ 3-00 



1-4755 



All these fractions on oxidation with alkaline potassium 

 permanganate solution by the method described in "Parry's 

 Essential Oils," second volume, page 37, x yielded crystals 

 of sodium nopinate, which on decomposition with dilute 

 sulphuric acid gave crystals of the free acid. On recrystal- 

 lisation from benzene they were obtained in needle crystals 

 melting at 127° O. The terpenes are, therefore, a and P 

 pinene. 



Alcoholic bodies (unidentified). — In the repeated re-dis- 

 tillation of the portion of the oils boiling at 90 - 123° O. at 

 10 mm., the following fractions were obtained: — 



1 See author's paper on the " Essential oils of Leptospermum flavescens 

 var grandiflorum and L. odoratum, this Journal, liv, (1920), p. 203, 204. 



