EUCAL YPTUS. 287 



degrees C., and twenty-four to twenty-six per cent, from 

 180 to 230, after which a "destructive distillation" begins. 

 In making a series of re-distillations and partial distil- 

 lations, Mr. E. M. Wade, gave his very valuable assistance 

 and it is cause for regret that neither time nor opportunity 

 has enabled us to decide what were the different products 

 of these partial distillations with the single exception of 

 that portion of the oil which came over between 175 and 

 1 80 degrees, which is Eucalyptol, but we cannot agree with 

 the authority which follows, that it crystallizes at a tem- 

 perature of one degree C., or at any other lower temper- 

 ature. 



THE CHEMISTRY OF THE AUSTRALIAN INDIGENOUS 

 VEGETATION. 



PRESIDENTIAL ADDRESS OF M. J. H. MAIDEN, F. C. S., F. L.S., &c., 

 PRESIDENT OF SECTION B. CHEMISTRY, &c. 



AUSTRALASIAN ASSOCIATION FOR THE ADVANCEMENT OF SCIENCE. 



(Cineol is the same as Eucalyptol K.) 



EUCALYPTUS OIL. 



The scientific investigation of individual Eucalyptus Oils is in a very 

 incomplete state, and from the special circumstances connected with 

 them, Australian chemists possess peculiar advantages for their examin- 

 ation. They afford a peculiarly tempting subject for research. 



The Oleum Eucalypti of the B. P. of 1885 is defined as " the oil dis- 

 tilled from the fresh leaves of Eucalyptus globulus lyabill., Eucalyptus 

 amygdalina, Ivabill., and probably other species of Eucalyptus. 



11 Characters and Tests. Colorless or pale straw-colored, becoming 

 darker and thicker by exposure. It has an aromatic odor, and a spicy 

 and pungent flavor, leaving a sensation of coldness in the mouth. It is 

 neutral to litmus paper. Specific gravity about 0.900. Soluble in about 

 an equal weight of alcohol." 



The unsatisfactoriness or this definition is recognized by the British 

 Pharmaceutical Conference, for in question 14 (1894 meeting) it is stated : 



