578 HOW DOES MAN CONSERVE HIS RESOURCES? 



Pine, especially, is probably used more extensively than any other 

 wood. It is used for all heavy construction work, frames of 

 houses, bridges, masts, spars, and timber of ships, floors, rail- 

 way ties, and many other purposes. Cedar is used for shingles, 

 cabinet work, lead pencils, etc. ; hemlock and spruce for heavy 

 timbers. Another use for our lumber, especially odds and ends of 

 all kinds, is in the packing-box industry. Hemlock bark is still 



-"f^-jrav"* 5 !- 



■ 



Swan — U. S. Forest Service 

 Caterpillar truck hauling load of logs to the railroad. 



used for tanning. Some of the soft woods, as the poplars, are used 

 for making excelsior used in packing. Wood pulp from the fiber of 

 aspen, basswood, cottonwood, and other trees is chemically treated 

 and used for making artificial silk, rayon. The hard woods, ash, 

 red gum, beech, birch, cherry, chestnut, elm, maple, oak, and 

 walnut, are used largely for the " trim " of our houses, for manu- 

 facture of furniture, for spokes of wagon or car wheels and for 

 many other purposes. Our hard wood supply is rapidly becoming 

 exhausted, particularly ash and hickory, and our only remedy is 

 to plant more trees of this kind. 



