XXX. ABSTRACT OP PROCEEDINGS. 



at H° = 0-8629, and specific rotation at 18° C. of + 41 "2°. The 

 oil from E. lasvopinea gave 88 per cent., distilling between 157° 

 and 172° C. and this lsevopinene on final rectification gave the 

 following results: boiling point 157° C, specific gravity at £° = 

 0-8755, at f§-° = 0-8626, and specific rotation at ] 9° C. = - 48-63. 

 These results show that Eucalyptus oils contain pinenes having 

 both right and left rotation. When equal volumes of these two 

 pinenes were mixed it was found that the dextropinene had exactly 

 neutralised an equivalent portion of the lsevopinene as the remain- 

 ing rotation was found to be almost identically the amount 

 required theoretically. The dextropinene appears to be identical 

 with that isolated from the oil of Eucalyptus globulus by Bour- 

 chardat and Tardy (Comp. rend. 1895, 120, 1417) and may be 

 considered to be the physical isomeride of terebenthene obtained 

 from French oil of turpentine. It also appears probable that the 

 Eucalyptus dextropinene may eventually be found to be the 

 isomeride of Eucalyptus lsevopinene, and that these two pinenes 

 always occur together in the natural state in various proportions, 

 which governs the rotation of the particular oil. No phellandrene 

 was detected in the oils of either species, and only a minute trace 

 of eucalyptol. The hydrates, nitrosochlorides, monochloride etc., 

 were prepared from both pinenes, and these were found to give 

 identical results with those obtained from Australene and tere- 

 benthene, which terpenes they therefore chemically and physically 

 resemble. The results indicate that these Eucalyptus pinenes 

 (N.O. Myrtacese) are identical with the pinenes obtained from the 

 pines (N.O. Coniferse). It was stated by the author that it appears 

 now to be proved that the oils from identical species of Eucalypts 

 always contain the same constituents at the same time of the 

 year. The red colour of these two crude oils can be readily 

 removed by agitating with potash and the resulting product would 

 form in appearance, odour, and composition a commercial oil of 

 turpentine, either lsevorotatory or dextrorotatory according to the 

 species of Eucalypt from which the oil was obtained. For pur- 

 poses of identification the author suggests the name Eudesmene 



