THE SWISS METHOD OF REGULATING THE CUT IN PRACTICE 573 



Table 6. — Comparison of Allowable Annual Cut Computed by the Swiss Method, Von 



Mantel's Formula and the Area Check on 2356 Acres of Selection Forest, 



Catskill Mountains, Ulster County, New York 



IV II I 



Corre- Von Area^ 



sponding Swiss Mantel's Check Average of thret 



Rotation d. b. h. Method method method methods. 



Species years^ inches Ft. B. M. Ft. B. M. Ft. B. M. Ft. B. M. 



Hemlock.. 140 16 31,384 12,760 32,890 25,678 



Beech 240 16 40,372 27,650 44,420 37,481 



Birch 160 16 50,040 30,175 49,270 43,161 



Maple 180 16 71,776 43,425 84,060 66,420 



Totals 193,572 114,010 210,640 172,740 



1 Technical rotation — i. e., years required to reach 16 inches d. b. h. 

 2Cut=-p;^X amount to be removed per acre, where CC = cutting cycle, and A = 



area of forest. 



Note. — The roman numerals refer to the numbers of the methods in "Theory 



and Practice of Working Plans," Second edition, John Wiley & Sons, N. Y., 1917. 



Table 7. — Comparison of Allowable Annual Cut as Determined by both Variations of 



the Swiss Method, and by Von Mantel's Method, on 3,374 Acres of Selection 



Forest, Peninsula State Park, Door County, Wisconsin 



Correspond- Allowable annual cut, Bd. Ft. 



Rotation ing d. b. h. Var. II Var. I Von Mantel's 



Species Years^ inches Swiss method method Average 



Balsam 120 12 5,769 5,454 4,582 5,268 



White pine 85 15 16,900 16,953 10,719 14,857 



Red pine 85 15 8,934 8,951 6,682 8,189 



Hemlock 160 15 43,531 42,580 22,069 36,060 



Beech 180 14 15,907 15,723 6,649 12,759 



Birch2 70 10 9,284 6,241 7,854 7,793 



Maple 170 14 26,000 19,753 10,527 18,760 



Basswood 100 14 5,276 4,105 2,637 4,006 



Oak 100 14 10,584 8,595 7,554 8,911 



Ash 100 15 1,555 603 719 



Popple' 55 10 9,026 8,322 5,962 7,770 



Totals 151,211 138,232 85,838 124,093 



1 For discussion of methods see Recknagel, "Theory and Practice of Working 

 Plans," Second edition, John Wiley & Sons, New York, 1917. Var. I of the Swiss 



Y 4-Z Y-\-Z 



Method takes CC= .^r- , x.- , ^. and annual cut = • ^^ . Var. II of the Swiss 

 Xt+Yt+Zt CC 



Y Y-\-Z 

 Method takes CC= ^. , ... and annual cut = ^„ . 



Xi + Yx CC 



* Technical Rotation. 

 ' Volumes in Cubic Feet. 



Insufficient data are at hand to warrant positive statements regard- 

 ing facts which can be obtained by the use of the Swiss method. Yet 

 the results obtained and sho^vn in this article, together with those 

 secured previously, would certainly warrant its further use in regulat- 

 ing the cut in mixed selection forests. 



