1 66 THE PRINCIPAL SPECIES OF WOOD. 



Tamarack Larch. Larix occidentalis. 



Nomenclature. (Sudworth.) 



Tamarack, Larch (local and Western Larch, Great Western 



common names). Larch, Red American Larch. 



Hackmatack (Idaho, Wash.). Western Tamarack (Cal.). 



Locality. 



Washington and Oregon, intermittently to Montana. 



Features of Tree. 



Ninety to one hundred and twenty-five feet high, two and one- 

 half to four feet in diameter. A large tree. 



Color, Appearance, or Grain of Wood. 



Heartwood light red, thin sapwood lighter. Coarse-grained, 

 compact structure, annual rings pronounced. 



Structural Qualities of Wood. 

 Hard, heavy, strong, durable. 



Representative Uses of Wood. 



Posts, railway ties, fuel, limited quantity of lumber, similar to 

 L. americana. 



Weight of Seasoned Wood in Pounds per Cubic Foot. 



46. 

 Modulus of Elasticity. 



2,300,000. 

 Modulus of Rupture. 



17,400. 



Remarks. 



A valuable tree of the Columbian basin. Differs from L. ameri- 

 cana in that it grows on dry ground, often at high elevations. 



