PINENES OF THE OILS OF THE GENUS EUCALYPTUS. 203 



a few days afterwards, gave 0*66 per cent, of oil, 1 or 100 lbs. gave 

 10 J ounces. 0ti rectification (after discarding two per cent, that 

 came over below 157° C.) the following results were obtained : — 

 60 per cent, distilled between 157° - 164° 0. = first fraction 

 28 „ „ „ 1 64° -1 72° C. = second fraction 



Specific gravity, first fraction, at 18° C. =0*8676 

 ,, ,, second ,, ,, =0*8725 



crude oil „ =0*8732 



„ rotation, first fraction, -46*74° 



„ „ second „ - 44*3° 



On again rectifying the first fraction (that portion distilling 

 between 157° - 164° C.) the following results were obtained : — 

 42 per cent, distilled between 157° - 160° C. = first fraction 

 35 „ „ „ 160° - 164° C. = second fraction 



Remainder not distilled. 



Specific gravity first fraction at 19° C. =0*8630 

 „ ,, second „ „ =0*8641 



„ rotation, first fraction - 47*86 

 „ ,, second „ - 47*38 



The third and final rectification, again taking the first fraction, 

 gave 50 per cent, of an oil boiling between 157° - 158° C. This 

 gave results as follows : — 



Specific gravity at f° C. =0*8755 

 it C. =08626 

 Specific rotation taking density at 19° C. - 48*63. 



The boiling point of this lsevorotatory pinene may be stated to 

 be 157° C. and the specific rotation for sodium light -48*63°. 

 This lsevorotatory pinene thus boils at one degree higher temper- 

 ature than the dextrorotatory form, and has a higher reverse 

 rotation. 



The same apparatus was used for the whole of the redistillations, 

 and the results were obtained under exactly similar conditions, 

 and upon the same quantity of oil. The redistillations were not 



1 This Eucalypt is known locally as " Silver Top Stringybark." 



