EUCALYPTUS AUSTRALIANA AND ITS ESSENTIAL OIL. 521 



would probably be nearly correct, then for June an average 

 yield of 2*5% was obtained; for July 3%; for August 3*2%; 

 for September 3*4%; and for a part of October 3*3%. 



We have been informed that as much as 90 fbs. of oil have 

 been obtained from two tanks at one distillation with this 

 species, 50 lbs. for the first hour, and 40 lbs. for second 

 hour, but we have no other data by which to confirm this 

 statement. Of course, if the leaves were more closely 

 packed in the tank a greater amount of oil would neces- 

 sarily be obtained from the distillation, although the amount 

 of second hour oil seems out of proportion to that of the 

 first hour. 



Analysis of the Oil. 

 The crude oil of the Yourie and Tanto material, distilled 

 at the Technological Museum, was of a very light lemon 

 tint, had quite a pleasant odour, the volatile aldehydes not 

 being at all pronounced. The oil contained a large amount 

 of cineol. The reaction for phellandrene was not distinc- 

 tive at this time of the year, although indications for the 

 presence of that terpene were obtained with the first 

 fraction. 



The crude oil, which had been distilled right out, had a 

 specific gravity at 15° O. of 0*9157; rotation a D = + 2*8°; 

 refractive index at 20° O. = 1*4644; and was soluble in 1*2 

 volumes of 70% alcohol. On fractionation only 2 cc. of acid 

 water and some oil containing aldehydes came over below 

 172° O. (corrected). Between 172° and 193° O. 84% dis- 

 tilled. This fraction had specific gravity at 15° = 0*9119; 

 rotation ch, = + 2*7°; and refractive index = 1*4623. It 

 was very rich in cineol. The second fraction only repre- 

 sented 5% of the total oil, and this distilled between 193° 

 and 220°. It had specific gravity at 15° - 0.9165; rotation 

 a„ = + 0*8°; and refractive index = 1*4679. The third 

 fraction was also 5%, distilling between 225° and 260°. This 



