126 



Journal of the Mitchell Society [Decemher 



PRODUCTION OF CRUDE TURPENTINE PER TREE. 



Here again definite figures are difficult to give, for there is 

 no reliable information concerning the number of trees in opera- 

 tion. Furthermore, there is often very wide variation in the 

 producing power of adjacent trees of the same species, size, and 

 crown. But from the data in the publications of the United 

 States Forest Service, an average American pine, worked under 

 the cup system, will produce, during four years of operation, an 

 annual average of ten pounds of crude turpentine and two and 

 a half pounds of "scrape," the proportionate yield being con- 

 siderably greater during the first and second than during the 

 third and fourth years of operation. 



The average daily flow of crude turpentine during one week 

 from a freshly chipped surface on such pines is shown in the 

 following table, the results having been obtained during the 

 summer of 1901 on trees near Statesboro, Georgia: 



