218 AVERAGE YIELDS FROM FOREST LAND 



SILVER FIR. 



Close-Canopied High Forest. Soil and situation Quality II. 



Value of final crop, 6050 cub. ft., at 6|d. 

 = (say) 164. 



Total yield of thinnings = 1160 cub. ft. to 2 in. q. g. 

 final crop = 6700 cub. ft. to 2 in. q. g. 



Total = 7860 



Average annual increment =-- '- ? 



90 



= 87^ cub. ft. 



Norway Spruce. The total yield of Norway Spruce will 

 be rather less. The thinnings will yield rather more, and be 

 begun earlier, but the final crop will not be so great. Usually 

 a rotation of 70 to 80 years will be sufficient for the Spruce. 



Norway Spruce on an So-year rotation should give an 

 average annual increment of 80 cubic feet on soil and 

 situation of Quality II. 



