42 



BULLETIN 1003, U. S. DEPARTMENT OF AGRICULTURE. 



ing the refining process, partly in the alkali residuum and partly in 

 the aqueous distillate. 



A summary of yields a cord of both crude and refined products 

 obtained from each class of wood is given in Table 19. 



TABLE 19. Yields per cord of crude and refined products from each class of 



wood distilled. 



The average weight a cord of the rich stumpwood is 2,612 pounds, 

 as against 2,450 pounds for selected stumpwood, and 2,412, 2,400, 

 2,100, and 2,400 pounds for medium stumpwood, dead, down knots 

 and limbs, poor stumpwood, and green tops and limbs, respec- 

 tively. The corresponding yields of refined first turpentine are 16.8, 

 10.8, 10.7, 8.2, 8.5, and 3.1 gallons a cord; and the yields of total 

 merchantable turpentine are 19.8, 12.2, 12.7, 10.2, 9.7, and 3.8 gallons 

 a cord, respectively. With the exception of that from the green tops 

 :in.l limbs, the yield of turpentine a cord follows the weight a cord. 

 The yields of pine oil and crude light oil, while not varying greatly, 



