198 



REPORT OF THE 



The following table shows, in percentages of the present cut to the 

 three diameter limits, what the future cuts will be in from 10 to 50 years: 



TABLE No. 20— FUTURE CUTS OF SPRUCE, EXPRESSED IiN- PERCENTAGES OF 



PRESENT STAND. 



Cutting limit : 



diameter 



breasthigh 



Inches. 

 10 



12 



14 



Average 



present stand 



per acre. 



Standards. 

 22.94 



19 43 

 15-56 



Average cut per acre obtainable at the end of lo- 

 year periods, expressed in percentages of present 

 stand. 



8.3 



II 3 



24.4 



22 7 



% 



4-37 



% 

 70-3 



32.0 



63-9 



106 6 



59-0 



106.4 





% 

 105-7 



Interval required 



between 



equal cuts. 



Years. 

 50 



39 

 29 



lable No. 21 shows the total future yield of Spruce to be expected 

 from the merchantable area of Township 40, in from 10 to 50 years, after 

 cutting to 10, 12, or 14 inches. 



TABLE No. 21 —ESTIMATE OF FUTURE TOTAL YIELD OF SPRUCE ON MERCHANT- 

 ABLE AREA. 



Cutting limi": 

 diameter 

 breasthigh. 



Total 

 present 

 stand. 



Total yi'^ld per acre obtainable at the end of lo-year periods, 

 in standards. 



Interval 



required 



between 



equal cuts. 





Standards. 

 387596.89 



328 287.56 



262 953.68 



10 



20 



,'o 



40 



50 





Inches. 

 10 



12 



32 102.40 



37 171-20 



64 204.80 



87 859.20 



104 755-20 

 155 443-20 



168 960.00 

 209 510.40 

 280 473.60 



272 025.60 



349 747-20 



408 883.20 



Years. 

 50 



39 

 29 



14 









It will be seen from these tables that if 10 inches be adopted as the 

 present diameter limit, almost 50 years must elapse before an equal cut can 

 again be obtained. The rotation with a 12-inch limit is 39 years, while if 

 14 inches be chosen, 29 years will be the interval between equal cuts. A 

 comparison of the amounts to be obtained shows that it is more profitable 

 to cut to a 12-inch limit than to a lo-inch limit, and also that cutting to 14 

 inches will yield more in the long run than cutting to 12 inches. The 

 present yield to a 14-inch limit is not, however, large enough to justify the 

 construction of logging roads, the building of camps, the improvement of 

 streams, and the meeting of other expenses necessary for lumbering. Cut- 



