AND THEIR ESSENTIAL OILS. 49 



Oil of E. Delvgattwiix. Oil of E. Delegatnusis. 



(Mt. Wellington, (Mt.' Delegate. 



Tas., 1908.) N.S.W., 1891).) 

 Specific gravity ; crude oil 



at!5 C 1 0-8664 0-8602 



Rotation a D ditto 48-4 58'6 



Refractire index at '24 .... 1-4828 At 16 = 1-4881 



S. N . ester and free acid .... 3-1 3-5 



Insoluble In 10 vols. 80/ In 10 voK 80/ 



alcohol alcohol 

 -Specificg ravity, first trac- 

 tion at 15 0-8532 0-8513 



Ditto, second fraction 0-8764 0'8712 



Ditto, third fraction ... 0-9004 0-9017 



It is thus seen that the characteristic features of the 

 one oil are also shown with the other, and as the botanical 

 results are also in agreement it is evident that this tree is 

 common to both Tasmania and the mainland. 



Material of the " Gum-topped Stringy-bark " for dis- 

 tillation was collected at Strickland in August, 1912. The 

 oil was found to agree in all respects with that of E, 

 DeJegatenai* from Mt. Wellington and from New South 

 Wales. It contained the same constituents, practically 

 the same amounts, and the physical characters of the oil 

 agreed most closely. The specific gravity at 15 0'8596 ; 

 rotation a D - - 47'4 ; refractive index at 17 =* 1'4826, 

 Hiid was insoluble in 10 volumes 80 per cent, alcohol. The 

 saponification number of ester and free acid was 3'2. The 

 yield of oil was 1*3 per cent., which is somewhat less than 

 is usual with this species ; but the time of the year is most 

 probably answerable for this. 



Material of the " Gum-topped Stringy-bark " growing 

 at Lake Sorell was sent for distillation in August, 1912. 

 The trees were those originally mentioned by Mr. Stephens 

 as growing at this locality. These trees are Eucalyptus 

 Dele gate?) sis, and the oil agreed in all respects with that 

 from the " Gum-topped Stringy-bark " at Strickland, 

 also from the same species growing at Mt. Wellington, 

 and also that from the New South Wales trees of this 

 species. It contained the same constituents and in prac- 

 tically the same amounts, and the physical characters 

 agreed most closely. The specific gravity of the crude oil 

 at 15 C. == 0-8676; rotation a^ = - 47'7 ; refractive 

 index at 20 = 1'4819 ; and was insoluble in 10 volumes 

 80 per cent, alcohol. The comparative constancy in the 

 characters of the oil of this Eucalyptus species is, from 

 these results, shown conclusively. 



