266 Forestry Quarterly 



Table 4 



Regulation of Cut— 1730 Acres of Slope Type. Catskill Mts. 



Rotation Allowed Annual Cut, 



Board Feet 



Corresponding 



D. B. H. Swiss von Mantel's 



Species Years Inches Method Method 



Hemlock 160^ 12^ 8,055 7,411 



Beech 200 16 15,996 14,646 



Birch 140 16 42,913 40,715 



Maple 160 16 25,506 16,573 



Other hardwoods (16) (21,484) 



Total of first four species. ... .. 92,470 79,345 



Total all species . . 113,954 



In the case of the Adirondacks, the same data were worked up. 

 The Swiss method was then appHed, not separately by species, but 

 for all the species in the given type.^ The diameter limits, b. h., 

 and corresponding ages were: spruce 12", 100 years (Graves' 

 Principles of Handling Woodlands, p. 12) ; hemlock 14", 160 

 years (U. S. Dept. Agr. Bull. 152 [N. S.]) ; Balsam fir 10", 128 

 years (U. S. Dept. Agr. Bull. 55 [N. S.] ) ; beech 14", 184 years; 

 Yellow birch 14", 147 years ; Hard maple 14", 167 years.^ The 

 other species were considered as being similar to the Hard maple. 

 "X" in the Swiss Method = all below the named diameter limits ; 

 Y = all between the named diameter limits and including 24" 

 d.b.h. ; Z = everything 25" d.b.h. and over. 



In tabular form the data are as follows : 



Table 5 

 Current Annual Increment Per Acre in Feet Board Measure 



Mis- 

 Soft Bal- Hem- Black cellan- 

 Type Beech Birch Maple Maple Spruce sam lock Ash eous Total 



Swamp 12.92 1.49 10.24 8.78 9.44 6.54 3.64 3.66 56.71 



Spruce 12.74 20.40 13.32 17.12 16.86 7.79 18.84 47 96.54 



flat 



Hard- 47.69 24.09 55.55 5.61 5.66 0.33 7.30 .05 146.28 



wood 



Y Y+Z 



Applying the Swiss Method, CC = y'j-V ^'^^ ^^^ ~ ~~rr~ 

 the results are as follows : 



1 U. S. Dept. Agr. Bull. 152 (N. S.), Table 10. With a cutting cycle of 

 56 years there would be about 3 cuttings in a rotation; with a cutting cycle of 

 26 years there would be about 6 cuttings in a rotation. 



^ If this had been done in the case of the Catskill data, the result would have 

 been 112,493 as against 113,954 board feet, from which it is evident that the 

 total cut is practically identical in either case. However, the figuring by 

 species is, undoubtedly, the more accurate. 



» This compares closely with Table 7, U. S. Dept. Agr. Bull. 285 (N. S.), 

 which gives for 14", beech 180 years, Yellow birch 155 years, Hard maple 171 

 years. 



