Application of Pressler's Formula 265 



Using the data given above (Table 3) and a 12-inch d.b.h. Hmit, 

 the cut for hemlock figured by this method would be as follows : 



CC= 



xi-{-yi-\-zi 



y= 138.31 board feet 



168.48 ., 

 306.79 



Xi= 3.032 " 



Yi= 2.214 " 



Zi= .232 " 

 5.478 



Substituting, CC = _ .^ = 56 years. 



V -i— 7 'X,(\f\ 70 



Annual cut = -— — = _' = 5.478 board feet or, for the 1730 

 CG 56 



acres in the slope type = 9,477 board feet of hemlock. 

 Eliminating Z and Zi in figuring CC : 



_y 138.31 _ 138.31 



Xi^Yi ~ 3.032+2.214 ~ 5.246 " ^'^^''^' 



V_l_ 7 'XC\f\ 70 



Annual cut = ^^ = — z^ = 11.797 board feet, or, for the 

 CC 26 



1730 acres on the slope type, = 20,409 board feet of hemlock. 



For the other species in the Catskills, the cut, to a diameter 

 limit of 16" b. h., figures out as follows: 



Beech: 10.878 bd. ft. per acre 

 Birch: 29.183 " " " '* 

 Maple: 17.345 " " " " 

 Others : 14.610 " '' " " 



18,819 bd. ft. for 1730 acres. 

 50,487 " " " " 

 30,007 " " " " 



25,275 " " " " 



These volumes must, however, be reduced 15 per cent for local 

 defect in the timber. For example, the hemlock is reduced from 

 9477 board feet to 8055 for the 1730 acres. The corrected values 

 for the Catskills, together with the probable rotation and a com- 

 parison of the cut as figured by von Mantel's method, follow : 



