ESSENTIAL OIL. Material for distillation was collected in July, 1908, at 

 Mt. Wellington, Tasmania, at an altitude of about 2,500 feet above sea-level. 

 The principal constituent in the oil of this species was phellandrene, and both 

 cineol and pinene were almost absent. The peppermint constituent, piperitone, 

 was present in small amount. The results obtained with the oil of this species 

 from Tasmania are in remarkable agreement with those of the oil of this species 

 from Delegate Mountain, southern New South Wales, collected in February, 1899 

 (results of which were published in the first edition of this work), although the 

 distance separating these localities is great. The difference in the time of the 

 year when the material was collected naturally influences the physical characters 

 somewhat, because the principal terpene common in the oil of Eucalyptus species 

 is usually present in greatest amount during the early summer months. 



The yield of oil from leaves and terminal branchlets was 1-88 per cent. 

 The crude oil was of a lemon-yellow colour. It had specific gravity at 15 C. = 

 0-8664 ; rotation a D 48-4 ; refractive index at 20 = 1-4846, and was insoluble 

 in 10 volumes 80 per cent, alcohol. The saponification number for the esters and 

 free acid was 3-1. 



On rectification, the usual amount of acid water and volatile aldehydes 

 came over below 172 C. (corr.), at which temperature the oil commenced to 

 distil. Between 172-183 C., 65 per cent, distilled; between 183-234, 12 per 

 cent., and between 234-270, 16 per cent. These fractions gave the following 

 results : 



First fraction, sp. gr. at 15 C. = 0-8532 ; rotation a D - - 54-2 ; refractive 



index at 20 = 1-4795. 

 Second ,, ,, ,, 0-8764; rotation a D -- 35-6; refractive 



index at 20 = 1-4830. 



Third ,, ,, ,, = 0-9004; rotation not taken; refractive 



index at 20 = 1-4932. 



The low specific gravity of the high-boiling constituents of the oil of this 

 species is worthy of remark, and is quite unusual for a first distillation. 



The following tabulated results with the two oils show how closely they 

 agree : 



Oil of E. Delegatensis. 



(Mt. Wellington, Tas.. 



July, 1908.) 



Oil of E. Delegatensis. 



(Mt. Delegate, N.S.W., 



February, 1899.) 



50068 U 



