STRINGYBARK TREES AND THEIR ESSENTIAL OILS. 109 



oil was of too dark a colour to enable the rotation to be takeu in 

 a 200 mm. tube. On redistillation of 100 cc. a few drops only 

 came over below 1724° 0., this portion contained some aldehydes 

 and also some volatile acids, as the water that is always obtained 

 in these redistillations was quite acid; the thermometer then rose 

 slowly to 1745° when the distillation proceeded, two per cent, 

 having been obtained. The temperatures were read in whole 

 degrees and were corrected to the nearest decimal. (See tabulated 

 results). 



First fraction 25%; sp. gr. =0-8993, specific rotation = +1-11° 



Second,, 35%; „ = 0-903, „ \, =+0-88° 



Eucalyptol in crude oil — no satisfactory reaction with phosphoric 



acid. Eucalyptol in first fraction = 47 -9%; second fraction = 53-0% 



Equal volumes of the first and second fractions were added 

 together and the eucalyptol found was 49*99 per cent, while the 

 mean of the two fractions was 50*45 per cent. 



No. 2. Oil from leaves collected at Rylstone, distilled 15th March, 

 1898. 

 This oil in colour and odour exactly resembled that from Ilford, 

 yield 0-281 per cent., or 100 lbs. of leaves and branchlets gave 

 four and a half ounces of oil; specific gravity as obtained = 0-927 

 at 22° C; the oil was too dark to enable the rotation to be taken 

 in a 200 mm. tube. On redistillation of 100 cc, the rate of 

 distillation and the percentage results obtained between the several 

 degrees of temperature 174*5° to 185*9° corresponded almost 

 exactly with the results obtained from the Ilford sample, No. 1 ; 

 and like the Ilford oil, contained but a small percentage of con- 

 stituents boiling below 174*5°: the percentage of eucalyptol in the 

 first fraction of both oils was but slightly less than that obtained 

 from the second fractions ; the oils obtained between the tem- 

 peratures 174*5° and 185*9° were taken as one fraction; the 

 specific gravity of which was 0*9023 at 23°; it showed no rotation 

 in a 200 mm. tube. The eucalyptol present was found to be 

 51*4 per cent., while that of a first fraction of another distillation 



