1899. 



AMERICAN FORESTRY ASSOCIATION. 



57 



These figures show that on a fully the age of eighty-three years with a 



stocked plot, there are between 3,000 density of only seven-tenths (a fully 



and 4,000 trees per acre at twenty years stocked area being rated as one). The 



of age. As the trees grow older they re- most striking feature of the table is the 



A GROWTH OF DOUGLAS SPRUCE ABOUT FIFTY YEARS OLD. 



quire greater room for their development, 

 and in consequence many are overtopped 

 and die. While the number of trees 

 per acre falls off with increase of age, 

 there are still 150 trees on Plot No. 9 at 



large yield in cubic feet and cords. An 

 examination of the last column of figures 

 will show that the mean annual incre- 

 ment is something over two cords per 

 acre. 



