2l8 



aromadendral. It contained pinene, which was apparently the dextro- 

 rotatory form ; phellandrene was absent, as was to be expected in this class 

 <>t Eucalyptus oils. Cymene was present in some quantity. Cineol was detected, 

 but it only occurs in the oil of this species in comparatively small amount. 

 Aromadendral was present in considerable quantity, and it was to this constituent 

 that the laevo-rotation of the oil was clue. 



The esters consisted largely of gerauyl -acetate. 



It is worthy of note how closely the oil of this species agrees with those 

 from the typical "Boxes" of the eastern coast of Australia, and of many of the 

 " Mallees."' 



The crude oil had specific gravity at 15 C. = 0-902, rotation a D — 5 - 8°; 

 refractive index at 20 = 1-4784, and was soluble in 1 volume 80 per cent, alcohol. 

 The saponification number for the esters and free acid was 18-9. 



On rectification, the usual amount of volatile aldehydes came over below 

 168° C. (corr.). Between 168-172 , 18 per cent, distilled; between 172-183 , 

 46 per cent, distilled ; between 183-219°, 18 per cent, came over, and between 

 219-240°, 9 per cent, distilled. These fractions gave the following results :— 

 First fraction, sp. gr. at 15° C. = 0-8848; rotation a D + 6-8°. 

 Second ,, ,, ,, = 0-8898; ,, + 0-5°. 



Third ,, ,, ,, = 0-9030; ,, — 8-9°. 



Fourth ,, „ ,, =0-9395; „ -30-1°. 



The cineol, determined by the phosphoric acid method in the second 

 fraction, was 18-8 per cent., representing about 10 per cent, of that constituent in 

 the crude oil. 



For the investigation of the aromadendral, see the article in this work, on 

 " The cyclic (aromatic) aldehydes occurring in Eucalyptus oils." 



There is little demand for this class of Eucalyptus oil at present, although 

 Dr. Cuthbert Hall has shown* that aromadendral has marked bactericidal pro- 

 perties, far greater than those of any other constituent in Eucalyptus oils. If not 

 suitable for medicinal purposes, such Eucalyptus oils, with a high aromadendral 

 content, might well be utilised for disinfectants, and also for soaps and similar 

 articles. 



The results obtained with the oil of this species were published by us in 

 the Pharmaceutical Journal, London, September, 1905. 



114. Eucalyptus occidentalism 



(Endl., in Hueg. Enum., 49, 1837.) 



Systematic- A tree sometimes reaching a height of 120 feet, but often 

 found flowering when quite small. Abnormal leaves broad, ovate, cordate, 

 somewhat acute. Normal leaves broad to narrow-lanceolate, usually under 6 

 inches long, acuminate, sometimes falcate, older leaves shining and coriaceous ; 

 venation not prominent in the older leaves, intramarginal vein removed from the 

 edge, lateral veins fine, distant, spreading, usually at an angle of 30° to the mid- 



* Kucalyptus oils, especially in relation to their bactericidal power. 



