24 



PRODUCTS FROM WASTE RESINOUS WOODS. 



TABLE 10. Summary of yields of products from long-leaf yellow pine. (Results ex- 

 pressed on basis of moisture-free wood.) 



SUPPLY OF WASTE RESINOUS WOODS. 



The supply of waste resinous wood suitable for the manufacture of 

 paper, turpentine, rosin, rosin oils, methyl alcohol, etc., can be only 

 approximately estimated. The census figures for the lumber cut in 

 1910 are: Long-leaf pine, approximately 14,000,000,000 board feet; 

 Douglas fir, 5,000,000,000 board feet; western pine, over 1,000,- 

 000,000 board feet; or a total of approximately 20,000,000,000 board 

 feet. Authorities agree that at least 60 per cent of the tree as it 

 stands in the forest is wasted in converting, it into lumber, and that 

 25 per cent of the trees remain in the forests to rot or be destroyed 

 in forest fires. That is, approximately 5,000,000 cords of waste 

 wood are left annually in the forests in the lumbering of resinous 

 woods, leaving out of consideration the dead and fallen timber in 

 the uncut forest. This waste has been going on for many years. 

 The sap or nonresinous part of the wood rots away in a few years, 

 leaving the heart or resinous portion which will last indefinitely. 

 Probably half of this annual forest waste becomes Alight wood," 

 such as is used in the production of wood turpentine and tar. This 

 material has been accumulating for years, and will probably continue 

 to be added to for many more years. 



In addition to this waste there is also a large source of supply in 

 the stumps of cut-over lands and in the slabs and edging usually 

 wasted at the mills. Altogether there are fully 8,000,000 cords of 

 waste resinous woods annually produced in the lumber industry. 



