PINENES OF THE OILS OF THE GENUS EUCALYPTUS. 201 



differ at times to a few degrees; constancy in optical rotation is 

 not experienced in these oils. The oil from the Rylstone sample, 

 rectified under exactly similar conditions, gave 60 per cent, 

 between 157° and 164° 0., and 28 per cent, more between 164° 

 and 172° C, so that the temperature required to distil the lsevo- 

 rotatory pinene is a little higher than that necessary to distil the 

 dextrorotatory form. 



These oils, from the type species, are red in colour, which from 

 their general appearance might indicate the presence of eucalyptol; 

 it was a surprise to find an almost entire absence of that con- 

 stituent. 



The dextrorotatory pinene. 



The leaves and terminal branchlets of Eucalyptus dextropinea, 

 from Currawang Creek, collected and distilled early in August 

 1898, gave 0*825 per cent, of oil, or 100 lbs. of leaves gave 13£ 

 ounces. On rectification (after discarding the first two per cent, 

 which came over below 156° C, and which contained but a minute 

 quantity of aldehydes) the following results were obtained : — 

 63 per cent, distilled between 156 - 162° C. = first fraction 

 25 „ „ „ 162 - 172° 0. = second fraction 



Specific gravity, first fraction, at 17° C. =0 8655 

 „ ,, second „ ,, = 0-8710 



,, „ crude oil „ =0-8743 



,, rotation, first fraction + 38*18° 



„ ,, second „ + 36*34° 



The leaves and branchlets of E. dextropinea from Barber's 

 Creek, collected and distilled at end of July 1898, gave 0*850 

 per cent, of oil, or 100 lbs. gave 13f ounces. On rectification 

 (after discarding the first two per cent, distilling below 156° G.) 

 this sample of oil gave : — 



62 per cent, distilling between 156° -.162° C. = first fraction 

 25 „ ,, „ 162°- 172° O. = second fraction 



Specific gravity, first fraction, at 17° 0. =0*8676 

 „ „ second ,, ,, =0*8744 



„ „ crude oil „ =0*8763 



„ rotation, first fraction, = +39*59° 

 „ „ second „ = +37*06° 



