102 FOREST COMMISSIONER'S REPORT. 



Sum of these products' 3 3. 4. Deducting [20 per 



cent '. '. 26.7 cu. ft. 



Percentage of annual growth to stand 1 05 per cent 



Annual growth on spruce trees over 10 inches 



diameter 23.6 cu. ft. 



Less amount added to defective trees 20 cu. ft. 



Equivalent of 20 cubic feet in board measures 



about 120 feet. 



Annual growth on acre supposing all species add 



same ratio to their volume as spruce 40.7 cu. ft. 



