SOIL AND ) 



SnrATiov I 



QUALITY I. 



(the best). 



DOUGLAS FIR 



[Continued. 



* This snm represents the average Dett income per acre which will be earned upon the average 

 MI<ltal when once the forest is in proper working rotation, i.e., when it is normally stocked 

 with crops of all ages from one year old up to maturity. The cost of replanting is estimated at 5 per 

 acre, and it is assumed that the land Is allowed to lie fallow for one year. 

 53 



Diagrams 



showing 



proportion of 



Thinnings to 



Final Crop. 



On a 

 43-year 



rotation. 



IN VOLUME. 

 (To 3 inches diameter.) 



IN VALUE. 



On a 

 90-year 



rotation. 



The most profitable rotation 



(according to the yields and prices indicated) 

 Is one of 45 to 48 years, if interest is reckoned at 3J or 

 4 per cent. 



Prices of Timber (standing). 



The timber has been valued according to the following scale of 

 prices : Per cub. ft. 



S. D. 



Trees containing less than 3 cub. ft. . 

 3 cub. ft 



l 



9 

 12 

 15 

 20 

 30 

 40 

 60 



