Volatile Oils. 55 



this means. Of all the Eucalypti the most remarkable in 

 this respects is the 



E. Globulus, or Blue Gum. 



The oil-cells in the leaves are very large, more particularly 

 those from young trees ; but the supply of oil is greater after 

 the leaves have changed from Obovate to Lanceolate, which 

 is the case when the trees are from three to four years of 

 age. The oil obtained is fine, clear, and limpid, pungent 

 and diffusible to the palate, in odour approaching Cajuput, 

 to which all oils from the Victorian Eucalypti have more or 

 less resemblance. From 100 lbs. of fresh gathered leaves and 

 branchlets I obtained 12 J ozs., sp. gr. # 917. 



This oil ranks foremost in value among those obtained 

 from the Eucalypti, on account of its solvent powers, its 

 illuminating properties, and its power of fixing the aroma of 

 allied oils. The tree has an extensive range. 



E. Oleosa, or Mallee Scrub. 



This yields an oil very similar to the last described, and 

 accordingly ranks next in value. The ease with which, at 

 little cost, an abundant supply of this species can be 

 obtained, renders it commercially more valuable than others 

 yielding a larger amount of oil from the same weight of 

 leaves. 



The general appearance of the Victorian Eucalypti is that 

 of forest trees, but this species seldom exceeds twelve feet in 

 height, and is studded with foliage from top to bottom, 

 forming, with other plants of the same and other genera, a 

 dense scrub. From 100 lbs. of green leaves and branchlets 

 I obtained 20 ozs., or one imperial pint of oil, sp. gr. 0911. 



E. Sideroxlyon, or Iron Bark. 



This species is frequent in the vicinity of the gold fields, 

 and on barren ranges. So closely does the oil from the 

 leaves of this tree resemble that of E. Globulus and E. Oleosa, 

 that when examined apart the difference would be scarcely 

 perceptible in any one outward characteristic. The yield of 

 oil from 100 lbs. of leaves was 16 ozs. 7 drs., sp. grav. 0'923. 

 This amount must be taken as approximate only, as the 

 leaves had lost some part of their oil by being heated in 

 transport. 



E. Gonioealyx, one of the White Gums. 



Yields an oil alike in character to that of the three pre- 

 ceding, and ends one type of oils, viz., E. Globulus. From 

 100 lbs. of fresh leaves and branchlets I obtained 16 ozs. oil,, 

 sp. grav. 918. 



