EXOGENOUS SERIES— BROADLEAF IVOODS. 125 



Jarrah. Eucalyptus marginala. 



Nomenclature. 



Jarrah (local and common name). 

 Mahogany Gum (Australia). 



Locality. 



Western coast of Australia. 



Features of Tree. 



Ninety to one hundred or more feet in height, two to five feet 

 in diameter. Fifty or more feet to lowest branch. Dull, 

 sombre appearance. Branches concentrated at top. 



Color, Appearance, or Grain of Wood. 



Reddish, resembles mahogany, also Kauri wood. 



Structural Quahties of Wood. 



Heavy, non-absorbent, somewhat oily, durable in contact with 

 the soil, receives good polish. Characteristic odor, wears 

 thin evenly, not easily inflammable. Said to repel teredo and 

 termite. 



Representative Uses of Wood. 



Marine work, exposed positions, ship-building, bridge timbers, 

 street-paving (London and Paris). 



Weight of Seasoned Wood in Pounds per Cubic Foot. 

 65 (Ednie-Brown).* 



Modulus of Elasticity. 



2,080,000 (Ednie-Brown).* 



Modulus of Rupture. 

 8900 (Ednie-Brown).* 



Remarks. 



Chief timber tree of southwestern Australia. Preferred by 

 Australian ship-builders. Often confused with Karri. f Speci- 

 men forty years old two feet in diameter. Miiller calls it 

 the least inflammable of woods. Marginata refers to thick- 

 edged leaves. 



* Report Forests Western Australia, Presented to Parliament, 1896. 



f The Melbourne Argus, December 31, 1892, states that the woods may be 

 distinguished by the fact that the ashes of Jarrah are white and those of Karri 

 black. Specimens of Jarrah wood seen by the writer were dark, suggesting black 

 walnut, those of Karri were red, resembling mahogany. 



