Application of Pressler's Formula 267 



CC Annual Cut Per Acre 

 Type Years Board Feet 



Swamp 44. 3 60. 52 



Spruce flat 41.8 109. 77 



Hardwood 36. 9 194. 91 



Average 41.0 



In order to compare these results with other methods, the rota- 

 tions used being: spruce, 100 years; hemlock, 160 years; Balsam 

 fir, 120 years; beech, 180 years; Yellow birch, 140 years; Hard 

 maple, 160 years; other hardwoods, 160 years; the annual cut was 

 figured by von Mantel's, Heyer's and Hufnagl's methods, as fol- 

 lows ; the cutting cycle for the Swiss Method being taken as an 

 even 40 years : 



Table 6 



Allowed Annual Cut Per Acre, Board Feet 

 von Mantel Heyer Hufnagl Swiss Average 



XII CC= 40 



Type II IX Var. 2 Years 



Swamp 39 ... ... 67 48 



Spruce flat 77 210 ... 115 134 



Hardwood 105 324 305 180 228. 5 



Note: The Roman numerals refer to the numbers of the methods in Forest 

 Working Plans, John Wiley & Sons, New York, 1913. 



From this it would appear that the cut as figured by the Swiss 

 method is amply conservative. It would seem to be a very com- 

 mon sense method of finding the allowed annual cut in a selection 

 forest. It should be checked, however, by other methods, such as 

 those illustrated above and by the area check. The basic data 

 should be revised at least once every decade. If the growing stock 

 then shows an unintentional and undesirable diminution, the cut 

 was set at too high a figure; if conversely, the growing stock at 

 the time of revision, shows an unintentional and undesirable 

 increase, the cut was set too low. 



