" Wood is an indispensable part of tlie material structure 

 upon which civilization rests ; and it is to be remembered 

 always that the immense increase of the use of iron and 

 substitutes for wood in many structures, while it has meant 

 a relative decrease in the amount of wood used, has been 

 accompanied by an absolute increase in the amount of 

 wood used. More wood is used than ever before in our 

 history." — ^Peesident Roosevelt, January 3, 1905. 



VI 



