SESQUITERPENE OF EUCALYPTUS OILS. 125 



boiling portions of several of the oils was practically identical with 

 that obtained from the oil of E. hcemastoma in the same manner. 

 Crystallised chemical compounds do not appear easy to produce 

 from it, and attempts to form a crystallised dihydrochloride, a 

 nitrosochloride, or a nitrosite, were unsuccessful, nor did it appear 

 possible to form a solid sesquiterpene alcohol from it. Having 

 thus to rely upon the product obtained by repeated fractional 

 distillation, finally over sodium, it cannot be considered to be- 

 sufficiently pure to determine its constants, with certainty, 

 although the results obtained were fairly satisfactory. 



The specific gravity of the sesquiterpene from the mixed oils 

 was 0*9229 at 19° C, and of that from E. hcemastoma at the same 

 temperature 0*9249. When it shall have been obtained pure it will 

 most probably be found to be inactive to light. It boiled under 

 atmospheric pressure at 260 - 265° C. 



An analysis resulted as follows: — 0'1366 gram gave # 438& 

 gram C0 2 and 0*1502 H 2 0, equal to 87*6 per cent, carbon and 12-2 

 per cent, hydrogen. C 15 H 24 requires 88*23 per cent. C. and 11*77 

 per cent. H. 



A vapour density determination, using the vapour of dipheny- 

 lamine, gave 11*8 cc. of moist air at 19° C. and 754 mm. pressure 

 from 0*1027 gram, indicating a molecular weight of 214. C ]5 K 24 

 equals 204. 



The most characteristic test of this sesquiterpene is the very 

 fine colour reactions it gives with acids and with bromine. If 

 one or two drops of the sesquiterpene be mixed with 2 or 3 cc. of 

 glacial acetic acid and the vapour of bromine allowed to pass 

 down the tube, immediately it reaches the liquid a crimson colour 

 is formed rapidly passing downwards, if agitated the whole 

 becomes crimson at once, soon changing to violet and in about 

 five or ten minutes it has become of a deep indigo-blue colour, 

 which remains persistent for a long time. A few drops of hydro- 

 bromic acid gives the same colour reactions as with bromine, and 

 as a bromide is formed from the sesquiterpene with the evolution 



