l66 FOREST REGULATION 



timber sales can be made, and thus the particular areas to be decided 

 upon from time to time. It is expected that long before the end 

 of forty years, the property is again examined and a new plan is 

 made in keeping with conditions as they will then exist. 



k. Hundeshagen's Method with Von Mantel's modification. 



Here the Cut = 2Ga /r. 



For our case : Cut = 2 X 3 2 oo million it/ 200 = 32 million per year. 

 On this plan the present supply would be cut in TOO years and at 

 that time little material over 120 years old could be expected to exist 

 on this property. For this reason the thirty-two million must be 

 regarded as about the maximum cut allowable. 



1. Austrian Method, or Heyer's Formula. 



Ga Gn 



Cut = Growth -I 



a. 



In this case: Cut = '80 + (8000 12500)7200, or about: 80 

 22 = 58 ft. per acre. 



For the property : 58 >< 400,000 23.2 million feet. 



It will be noticed that, in spite of the large amount of old stuff, 

 actual Growing Stock is smaller than normal Growing Stock, so that 

 it is not a surplus, but a deficit which must be spread. Since there 

 is no. special reason for spreading this over a shorter period, it is 

 distributed over an entire rotation, i. e., a is made equal r. 



m. Hufnagle's Method for smaller properties, might also be 

 used here with some modification. He prescribes estimating the 

 volume of stuff older than half the rotation and spreading this 

 volume over the period, i. e., over half the rotation. In our case this 

 might well be used : 



Growing stock older than T/2r 3200 million ft. 

 Time before the younger stock will be ready for the axe about 125 

 years, and for this period the merchantable tim'ber should be made 

 to last. Hence : 



Yearly Cut = 3200 million ft/125 = 25.6 million ft. 



n. Good silviculture demands that as far as possible oldest and 

 most defective stands should be cut first. But on a property of this 

 kind such requirement must often be disregarded for lack of op- 

 portunity to sell the material. For this reason the cut will be 



