128 THE PRINCIPAL SPECIES OF WOOD. 



Blue Gum, Fever Tree. Eucalyptus globulus. 



Nomenclature. 



Blue Gum (local and common Fever Tree (Australia), 

 name). Balluck (Australia). 



Locality. 



Native of Australia acclimated in southern California and else- 

 where throughout the world. 



Features of Tree. 



Two hundred to sometimes three hundred or more feet in height. 

 Three to six feet in diameter. Loose, shaggy, exfoliating 

 bark.* Leaves sometimes twelve inches in length. Color 

 varies with age. Characteristic odor. 



Color, Appearance, or Grain of Wood. 



Straw color. Sapwood lighter. Indistinct annual rings. Fibres 

 interlaced. 



Structural Qualities of Wood. 



Hard, heavy, durable, difficult to split. 



Representative Uses of Wood. 



Rollers, paving-blocks, ship-building, fuel. 



Weight of Seasoned Wood in Pounds per Cubic Foot. 

 43 to 69 (Mueller). 

 57 to 69 (Lazlett). 



Modulus of Elasticity. 

 Modulus of Rupture. 



Remarks. 



The Eucalyptus of California. The species planted in malarial 

 districts. Sanitary powers due to evaporation from large 

 leaves or presence of essential oils, which are thought to have 

 medicinal qualities. Grows very rapidly. 



* The bark is variable. Some trees of nearly i foot diameter have smooth green 

 bark resembling that on young willow saplings; most others have the shaggy bark, 

 while from some this has dropped away, exposing a smooth grayish interior sug- 

 gesting that of the sycamore. 



