Evergreens 



109 



U. S. Forest Service 



FIG. 69.' Wood of arbor vitae as seen 

 through a microscope. The wood is 

 light and, like that of other evergreens, 

 is non-porous and uniform in texture. 



U. S. Forest Service 



FIG. 70. Wood of the pifion, a 

 species of western pine. In the pine 

 there are resin ducts which appear as 

 openings in the wood. 



but when you come to one you will probably see near 

 it many others of the same species. 



The coniferous trees of the United States and Canada 

 all belong to the pine family. Among lumbermen 

 their wood is spoken of as " soft wood," although that 

 of the Georgia pine and some other kinds is hard. The 

 wood of deciduous trees is called " hardwood," although 

 that of some kinds of deciduous trees is soft. In the 

 four chapters that follow will be found descriptions of 

 our most important conifers. The wood that is fur- 

 nished by these trees is a most important source of 



